/* sv.c * * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, * 2000, 2001, 2002, 2003, 2004, 2005, 2006, by Larry Wall and others * * You may distribute under the terms of either the GNU General Public * License or the Artistic License, as specified in the README file. * * "I wonder what the Entish is for 'yes' and 'no'," he thought. * * * This file contains the code that creates, manipulates and destroys * scalar values (SVs). The other types (AV, HV, GV, etc.) reuse the * structure of an SV, so their creation and destruction is handled * here; higher-level functions are in av.c, hv.c, and so on. Opcode * level functions (eg. substr, split, join) for each of the types are * in the pp*.c files. */ #include "EXTERN.h" #define PERL_IN_SV_C #include "perl.h" #include "regcomp.h" #define FCALL *f #ifdef __Lynx__ /* Missing proto on LynxOS */ char *gconvert(double, int, int, char *); #endif #ifdef PERL_UTF8_CACHE_ASSERT /* if adding more checks watch out for the following tests: * t/op/index.t t/op/length.t t/op/pat.t t/op/substr.t * lib/utf8.t lib/Unicode/Collate/t/index.t * --jhi */ # define ASSERT_UTF8_CACHE(cache) \ STMT_START { if (cache) { assert((cache)[0] <= (cache)[1]); \ assert((cache)[2] <= (cache)[3]); \ assert((cache)[3] <= (cache)[1]);} \ } STMT_END #else # define ASSERT_UTF8_CACHE(cache) NOOP #endif #ifdef PERL_OLD_COPY_ON_WRITE #define SV_COW_NEXT_SV(sv) INT2PTR(SV *,SvUVX(sv)) #define SV_COW_NEXT_SV_SET(current,next) SvUV_set(current, PTR2UV(next)) /* This is a pessimistic view. Scalar must be purely a read-write PV to copy- on-write. */ #endif /* ============================================================================ =head1 Allocation and deallocation of SVs. An SV (or AV, HV, etc.) is allocated in two parts: the head (struct sv, av, hv...) contains type and reference count information, and for many types, a pointer to the body (struct xrv, xpv, xpviv...), which contains fields specific to each type. Some types store all they need in the head, so don't have a body. In all but the most memory-paranoid configuations (ex: PURIFY), heads and bodies are allocated out of arenas, which by default are approximately 4K chunks of memory parcelled up into N heads or bodies. Sv-bodies are allocated by their sv-type, guaranteeing size consistency needed to allocate safely from arrays. For SV-heads, the first slot in each arena is reserved, and holds a link to the next arena, some flags, and a note of the number of slots. Snaked through each arena chain is a linked list of free items; when this becomes empty, an extra arena is allocated and divided up into N items which are threaded into the free list. SV-bodies are similar, but they use arena-sets by default, which separate the link and info from the arena itself, and reclaim the 1st slot in the arena. SV-bodies are further described later. The following global variables are associated with arenas: PL_sv_arenaroot pointer to list of SV arenas PL_sv_root pointer to list of free SV structures PL_body_arenas head of linked-list of body arenas PL_body_roots[] array of pointers to list of free bodies of svtype arrays are indexed by the svtype needed A few special SV heads are not allocated from an arena, but are instead directly created in the interpreter structure, eg PL_sv_undef. The size of arenas can be changed from the default by setting PERL_ARENA_SIZE appropriately at compile time. The SV arena serves the secondary purpose of allowing still-live SVs to be located and destroyed during final cleanup. At the lowest level, the macros new_SV() and del_SV() grab and free an SV head. (If debugging with -DD, del_SV() calls the function S_del_sv() to return the SV to the free list with error checking.) new_SV() calls more_sv() / sv_add_arena() to add an extra arena if the free list is empty. SVs in the free list have their SvTYPE field set to all ones. At the time of very final cleanup, sv_free_arenas() is called from perl_destruct() to physically free all the arenas allocated since the start of the interpreter. Manipulation of any of the PL_*root pointers is protected by enclosing LOCK_SV_MUTEX; ... UNLOCK_SV_MUTEX calls which should Do the Right Thing if threads are enabled. The function visit() scans the SV arenas list, and calls a specified function for each SV it finds which is still live - ie which has an SvTYPE other than all 1's, and a non-zero SvREFCNT. visit() is used by the following functions (specified as [function that calls visit()] / [function called by visit() for each SV]): sv_report_used() / do_report_used() dump all remaining SVs (debugging aid) sv_clean_objs() / do_clean_objs(),do_clean_named_objs() Attempt to free all objects pointed to by RVs, and, unless DISABLE_DESTRUCTOR_KLUDGE is defined, try to do the same for all objects indirectly referenced by typeglobs too. Called once from perl_destruct(), prior to calling sv_clean_all() below. sv_clean_all() / do_clean_all() SvREFCNT_dec(sv) each remaining SV, possibly triggering an sv_free(). It also sets the SVf_BREAK flag on the SV to indicate that the refcnt has been artificially lowered, and thus stopping sv_free() from giving spurious warnings about SVs which unexpectedly have a refcnt of zero. called repeatedly from perl_destruct() until there are no SVs left. =head2 Arena allocator API Summary Private API to rest of sv.c new_SV(), del_SV(), new_XIV(), del_XIV(), new_XNV(), del_XNV(), etc Public API: sv_report_used(), sv_clean_objs(), sv_clean_all(), sv_free_arenas() =cut ============================================================================ */ /* * "A time to plant, and a time to uproot what was planted..." */ /* * nice_chunk and nice_chunk size need to be set * and queried under the protection of sv_mutex */ void Perl_offer_nice_chunk(pTHX_ void *chunk, U32 chunk_size) { dVAR; void *new_chunk; U32 new_chunk_size; LOCK_SV_MUTEX; new_chunk = (void *)(chunk); new_chunk_size = (chunk_size); if (new_chunk_size > PL_nice_chunk_size) { Safefree(PL_nice_chunk); PL_nice_chunk = (char *) new_chunk; PL_nice_chunk_size = new_chunk_size; } else { Safefree(chunk); } UNLOCK_SV_MUTEX; } #ifdef DEBUG_LEAKING_SCALARS # define FREE_SV_DEBUG_FILE(sv) Safefree((sv)->sv_debug_file) #else # define FREE_SV_DEBUG_FILE(sv) #endif #ifdef PERL_POISON # define SvARENA_CHAIN(sv) ((sv)->sv_u.svu_rv) /* Whilst I'd love to do this, it seems that things like to check on unreferenced scalars # define POSION_SV_HEAD(sv) PoisonNew(sv, 1, struct STRUCT_SV) */ # define POSION_SV_HEAD(sv) PoisonNew(&SvANY(sv), 1, void *), \ PoisonNew(&SvREFCNT(sv), 1, U32) #else # define SvARENA_CHAIN(sv) SvANY(sv) # define POSION_SV_HEAD(sv) #endif #define plant_SV(p) \ STMT_START { \ FREE_SV_DEBUG_FILE(p); \ POSION_SV_HEAD(p); \ SvARENA_CHAIN(p) = (void *)PL_sv_root; \ SvFLAGS(p) = SVTYPEMASK; \ PL_sv_root = (p); \ --PL_sv_count; \ } STMT_END /* sv_mutex must be held while calling uproot_SV() */ #define uproot_SV(p) \ STMT_START { \ (p) = PL_sv_root; \ PL_sv_root = (SV*)SvARENA_CHAIN(p); \ ++PL_sv_count; \ } STMT_END /* make some more SVs by adding another arena */ /* sv_mutex must be held while calling more_sv() */ STATIC SV* S_more_sv(pTHX) { dVAR; SV* sv; if (PL_nice_chunk) { sv_add_arena(PL_nice_chunk, PL_nice_chunk_size, 0); PL_nice_chunk = NULL; PL_nice_chunk_size = 0; } else { char *chunk; /* must use New here to match call to */ Newx(chunk,PERL_ARENA_SIZE,char); /* Safefree() in sv_free_arenas() */ sv_add_arena(chunk, PERL_ARENA_SIZE, 0); } uproot_SV(sv); return sv; } /* new_SV(): return a new, empty SV head */ #ifdef DEBUG_LEAKING_SCALARS /* provide a real function for a debugger to play with */ STATIC SV* S_new_SV(pTHX) { SV* sv; LOCK_SV_MUTEX; if (PL_sv_root) uproot_SV(sv); else sv = S_more_sv(aTHX); UNLOCK_SV_MUTEX; SvANY(sv) = 0; SvREFCNT(sv) = 1; SvFLAGS(sv) = 0; sv->sv_debug_optype = PL_op ? PL_op->op_type : 0; sv->sv_debug_line = (U16) ((PL_copline == NOLINE) ? (PL_curcop ? CopLINE(PL_curcop) : 0) : PL_copline); sv->sv_debug_inpad = 0; sv->sv_debug_cloned = 0; sv->sv_debug_file = PL_curcop ? savepv(CopFILE(PL_curcop)): NULL; return sv; } # define new_SV(p) (p)=S_new_SV(aTHX) #else # define new_SV(p) \ STMT_START { \ LOCK_SV_MUTEX; \ if (PL_sv_root) \ uproot_SV(p); \ else \ (p) = S_more_sv(aTHX); \ UNLOCK_SV_MUTEX; \ SvANY(p) = 0; \ SvREFCNT(p) = 1; \ SvFLAGS(p) = 0; \ } STMT_END #endif /* del_SV(): return an empty SV head to the free list */ #ifdef DEBUGGING #define del_SV(p) \ STMT_START { \ LOCK_SV_MUTEX; \ if (DEBUG_D_TEST) \ del_sv(p); \ else \ plant_SV(p); \ UNLOCK_SV_MUTEX; \ } STMT_END STATIC void S_del_sv(pTHX_ SV *p) { dVAR; if (DEBUG_D_TEST) { SV* sva; bool ok = 0; for (sva = PL_sv_arenaroot; sva; sva = (SV *) SvANY(sva)) { const SV * const sv = sva + 1; const SV * const svend = &sva[SvREFCNT(sva)]; if (p >= sv && p < svend) { ok = 1; break; } } if (!ok) { if (ckWARN_d(WARN_INTERNAL)) Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Attempt to free non-arena SV: 0x%"UVxf pTHX__FORMAT, PTR2UV(p) pTHX__VALUE); return; } } plant_SV(p); } #else /* ! DEBUGGING */ #define del_SV(p) plant_SV(p) #endif /* DEBUGGING */ /* =head1 SV Manipulation Functions =for apidoc sv_add_arena Given a chunk of memory, link it to the head of the list of arenas, and split it into a list of free SVs. =cut */ void Perl_sv_add_arena(pTHX_ char *ptr, U32 size, U32 flags) { dVAR; SV* const sva = (SV*)ptr; register SV* sv; register SV* svend; /* The first SV in an arena isn't an SV. */ SvANY(sva) = (void *) PL_sv_arenaroot; /* ptr to next arena */ SvREFCNT(sva) = size / sizeof(SV); /* number of SV slots */ SvFLAGS(sva) = flags; /* FAKE if not to be freed */ PL_sv_arenaroot = sva; PL_sv_root = sva + 1; svend = &sva[SvREFCNT(sva) - 1]; sv = sva + 1; while (sv < svend) { SvARENA_CHAIN(sv) = (void *)(SV*)(sv + 1); #ifdef DEBUGGING SvREFCNT(sv) = 0; #endif /* Must always set typemask because it's awlays checked in on cleanup when the arenas are walked looking for objects. */ SvFLAGS(sv) = SVTYPEMASK; sv++; } SvARENA_CHAIN(sv) = 0; #ifdef DEBUGGING SvREFCNT(sv) = 0; #endif SvFLAGS(sv) = SVTYPEMASK; } /* visit(): call the named function for each non-free SV in the arenas * whose flags field matches the flags/mask args. */ STATIC I32 S_visit(pTHX_ SVFUNC_t f, U32 flags, U32 mask) { dVAR; SV* sva; I32 visited = 0; for (sva = PL_sv_arenaroot; sva; sva = (SV*)SvANY(sva)) { register const SV * const svend = &sva[SvREFCNT(sva)]; register SV* sv; for (sv = sva + 1; sv < svend; ++sv) { if (SvTYPE(sv) != SVTYPEMASK && (sv->sv_flags & mask) == flags && SvREFCNT(sv)) { (FCALL)(aTHX_ sv); ++visited; } } } return visited; } #ifdef DEBUGGING /* called by sv_report_used() for each live SV */ static void do_report_used(pTHX_ SV *sv) { if (SvTYPE(sv) != SVTYPEMASK) { PerlIO_printf(Perl_debug_log, "****\n"); sv_dump(sv); } } #endif /* =for apidoc sv_report_used Dump the contents of all SVs not yet freed. (Debugging aid). =cut */ void Perl_sv_report_used(pTHX) { #ifdef DEBUGGING visit(do_report_used, 0, 0); #else PERL_UNUSED_CONTEXT; #endif } /* called by sv_clean_objs() for each live SV */ static void do_clean_objs(pTHX_ SV *ref) { dVAR; if (SvROK(ref)) { SV * const target = SvRV(ref); if (SvOBJECT(target)) { DEBUG_D((PerlIO_printf(Perl_debug_log, "Cleaning object ref:\n "), sv_dump(ref))); if (SvWEAKREF(ref)) { sv_del_backref(target, ref); SvWEAKREF_off(ref); SvRV_set(ref, NULL); } else { SvROK_off(ref); SvRV_set(ref, NULL); SvREFCNT_dec(target); } } } /* XXX Might want to check arrays, etc. */ } /* called by sv_clean_objs() for each live SV */ #ifndef DISABLE_DESTRUCTOR_KLUDGE static void do_clean_named_objs(pTHX_ SV *sv) { dVAR; if (SvTYPE(sv) == SVt_PVGV && isGV_with_GP(sv) && GvGP(sv)) { if (( #ifdef PERL_DONT_CREATE_GVSV GvSV(sv) && #endif SvOBJECT(GvSV(sv))) || (GvAV(sv) && SvOBJECT(GvAV(sv))) || (GvHV(sv) && SvOBJECT(GvHV(sv))) || (GvIO(sv) && SvOBJECT(GvIO(sv))) || (GvCV(sv) && SvOBJECT(GvCV(sv))) ) { DEBUG_D((PerlIO_printf(Perl_debug_log, "Cleaning named glob object:\n "), sv_dump(sv))); SvFLAGS(sv) |= SVf_BREAK; SvREFCNT_dec(sv); } } } #endif /* =for apidoc sv_clean_objs Attempt to destroy all objects not yet freed =cut */ void Perl_sv_clean_objs(pTHX) { dVAR; PL_in_clean_objs = TRUE; visit(do_clean_objs, SVf_ROK, SVf_ROK); #ifndef DISABLE_DESTRUCTOR_KLUDGE /* some barnacles may yet remain, clinging to typeglobs */ visit(do_clean_named_objs, SVt_PVGV, SVTYPEMASK); #endif PL_in_clean_objs = FALSE; } /* called by sv_clean_all() for each live SV */ static void do_clean_all(pTHX_ SV *sv) { dVAR; DEBUG_D((PerlIO_printf(Perl_debug_log, "Cleaning loops: SV at 0x%"UVxf"\n", PTR2UV(sv)) )); SvFLAGS(sv) |= SVf_BREAK; if (PL_comppad == (AV*)sv) { PL_comppad = NULL; PL_curpad = NULL; } SvREFCNT_dec(sv); } /* =for apidoc sv_clean_all Decrement the refcnt of each remaining SV, possibly triggering a cleanup. This function may have to be called multiple times to free SVs which are in complex self-referential hierarchies. =cut */ I32 Perl_sv_clean_all(pTHX) { dVAR; I32 cleaned; PL_in_clean_all = TRUE; cleaned = visit(do_clean_all, 0,0); PL_in_clean_all = FALSE; return cleaned; } /* ARENASETS: a meta-arena implementation which separates arena-info into struct arena_set, which contains an array of struct arena_descs, each holding info for a single arena. By separating the meta-info from the arena, we recover the 1st slot, formerly borrowed for list management. The arena_set is about the size of an arena, avoiding the needless malloc overhead of a naive linked-list The cost is 1 arena-set malloc per ~320 arena-mallocs, + the unused memory in the last arena-set (1/2 on average). In trade, we get back the 1st slot in each arena (ie 1.7% of a CV-arena, less for smaller types). The recovery of the wasted space allows use of small arenas for large, rare body types, */ struct arena_desc { char *arena; /* the raw storage, allocated aligned */ size_t size; /* its size ~4k typ */ int unit_type; /* useful for arena audits */ /* info for sv-heads (eventually) int count, flags; */ }; struct arena_set; /* Get the maximum number of elements in set[] such that struct arena_set will fit within PERL_ARENA_SIZE, which is probabably just under 4K, and therefore likely to be 1 aligned memory page. */ #define ARENAS_PER_SET ((PERL_ARENA_SIZE - sizeof(struct arena_set*) \ - 2 * sizeof(int)) / sizeof (struct arena_desc)) struct arena_set { struct arena_set* next; int set_size; /* ie ARENAS_PER_SET */ int curr; /* index of next available arena-desc */ struct arena_desc set[ARENAS_PER_SET]; }; /* =for apidoc sv_free_arenas Deallocate the memory used by all arenas. Note that all the individual SV heads and bodies within the arenas must already have been freed. =cut */ void Perl_sv_free_arenas(pTHX) { dVAR; SV* sva; SV* svanext; int i; /* Free arenas here, but be careful about fake ones. (We assume contiguity of the fake ones with the corresponding real ones.) */ for (sva = PL_sv_arenaroot; sva; sva = svanext) { svanext = (SV*) SvANY(sva); while (svanext && SvFAKE(svanext)) svanext = (SV*) SvANY(svanext); if (!SvFAKE(sva)) Safefree(sva); } { struct arena_set *next, *aroot = (struct arena_set*) PL_body_arenas; for (; aroot; aroot = next) { const int max = aroot->curr; for (i=0; iset[i].arena); Safefree(aroot->set[i].arena); } next = aroot->next; Safefree(aroot); } } PL_body_arenas = 0; for (i=0; icurr >= (*aroot)->set_size) { Newxz(newroot, 1, struct arena_set); newroot->set_size = ARENAS_PER_SET; newroot->next = *aroot; *aroot = newroot; DEBUG_m(PerlIO_printf(Perl_debug_log, "new arenaset %p\n", (void*)*aroot)); } /* ok, now have arena-set with at least 1 empty/available arena-desc */ curr = (*aroot)->curr++; adesc = &((*aroot)->set[curr]); assert(!adesc->arena); Newxz(adesc->arena, arena_size, char); adesc->size = arena_size; DEBUG_m(PerlIO_printf(Perl_debug_log, "arena %d added: %p size %d\n", curr, adesc->arena, arena_size)); return adesc->arena; } /* return a thing to the free list */ #define del_body(thing, root) \ STMT_START { \ void ** const thing_copy = (void **)thing;\ LOCK_SV_MUTEX; \ *thing_copy = *root; \ *root = (void*)thing_copy; \ UNLOCK_SV_MUTEX; \ } STMT_END /* =head1 SV-Body Allocation Allocation of SV-bodies is similar to SV-heads, differing as follows; the allocation mechanism is used for many body types, so is somewhat more complicated, it uses arena-sets, and has no need for still-live SV detection. At the outermost level, (new|del)_X*V macros return bodies of the appropriate type. These macros call either (new|del)_body_type or (new|del)_body_allocated macro pairs, depending on specifics of the type. Most body types use the former pair, the latter pair is used to allocate body types with "ghost fields". "ghost fields" are fields that are unused in certain types, and consequently dont need to actually exist. They are declared because they're part of a "base type", which allows use of functions as methods. The simplest examples are AVs and HVs, 2 aggregate types which don't use the fields which support SCALAR semantics. For these types, the arenas are carved up into *_allocated size chunks, we thus avoid wasted memory for those unaccessed members. When bodies are allocated, we adjust the pointer back in memory by the size of the bit not allocated, so it's as if we allocated the full structure. (But things will all go boom if you write to the part that is "not there", because you'll be overwriting the last members of the preceding structure in memory.) We calculate the correction using the STRUCT_OFFSET macro. For example, if xpv_allocated is the same structure as XPV then the two OFFSETs sum to zero, and the pointer is unchanged. If the allocated structure is smaller (no initial NV actually allocated) then the net effect is to subtract the size of the NV from the pointer, to return a new pointer as if an initial NV were actually allocated. This is the same trick as was used for NV and IV bodies. Ironically it doesn't need to be used for NV bodies any more, because NV is now at the start of the structure. IV bodies don't need it either, because they are no longer allocated. In turn, the new_body_* allocators call S_new_body(), which invokes new_body_inline macro, which takes a lock, and takes a body off the linked list at PL_body_roots[sv_type], calling S_more_bodies() if necessary to refresh an empty list. Then the lock is released, and the body is returned. S_more_bodies calls get_arena(), and carves it up into an array of N bodies, which it strings into a linked list. It looks up arena-size and body-size from the body_details table described below, thus supporting the multiple body-types. If PURIFY is defined, or PERL_ARENA_SIZE=0, arenas are not used, and the (new|del)_X*V macros are mapped directly to malloc/free. */ /* For each sv-type, struct body_details bodies_by_type[] carries parameters which control these aspects of SV handling: Arena_size determines whether arenas are used for this body type, and if so, how big they are. PURIFY or PERL_ARENA_SIZE=0 set this field to zero, forcing individual mallocs and frees. Body_size determines how big a body is, and therefore how many fit into each arena. Offset carries the body-pointer adjustment needed for *_allocated body types, and is used in *_allocated macros. But its main purpose is to parameterize info needed in Perl_sv_upgrade(). The info here dramatically simplifies the function vs the implementation in 5.8.7, making it table-driven. All fields are used for this, except for arena_size. For the sv-types that have no bodies, arenas are not used, so those PL_body_roots[sv_type] are unused, and can be overloaded. In something of a special case, SVt_NULL is borrowed for HE arenas; PL_body_roots[SVt_NULL] is filled by S_more_he, but the bodies_by_type[SVt_NULL] slot is not used, as the table is not available in hv.c, PTEs also use arenas, but are never seen in Perl_sv_upgrade. Nonetheless, they get their own slot in bodies_by_type[SVt_NULL], so they can just use the same allocation semantics. At first, PTEs were also overloaded to a non-body sv-type, but this yielded hard-to-find malloc bugs, so was simplified by claiming a new slot. This choice has no consequence at this time. */ struct body_details { U8 body_size; /* Size to allocate */ U8 copy; /* Size of structure to copy (may be shorter) */ U8 offset; unsigned int type : 4; /* We have space for a sanity check. */ unsigned int cant_upgrade : 1; /* Cannot upgrade this type */ unsigned int zero_nv : 1; /* zero the NV when upgrading from this */ unsigned int arena : 1; /* Allocated from an arena */ size_t arena_size; /* Size of arena to allocate */ }; #define HADNV FALSE #define NONV TRUE #ifdef PURIFY /* With -DPURFIY we allocate everything directly, and don't use arenas. This seems a rather elegant way to simplify some of the code below. */ #define HASARENA FALSE #else #define HASARENA TRUE #endif #define NOARENA FALSE /* Size the arenas to exactly fit a given number of bodies. A count of 0 fits the max number bodies into a PERL_ARENA_SIZE.block, simplifying the default. If count > 0, the arena is sized to fit only that many bodies, allowing arenas to be used for large, rare bodies (XPVFM, XPVIO) without undue waste. The arena size is limited by PERL_ARENA_SIZE, so we can safely oversize the declarations. */ #define FIT_ARENA0(body_size) \ ((size_t)(PERL_ARENA_SIZE / body_size) * body_size) #define FIT_ARENAn(count,body_size) \ ( count * body_size <= PERL_ARENA_SIZE) \ ? count * body_size \ : FIT_ARENA0 (body_size) #define FIT_ARENA(count,body_size) \ count \ ? FIT_ARENAn (count, body_size) \ : FIT_ARENA0 (body_size) /* A macro to work out the offset needed to subtract from a pointer to (say) typedef struct { STRLEN xpv_cur; STRLEN xpv_len; } xpv_allocated; to make its members accessible via a pointer to (say) struct xpv { NV xnv_nv; STRLEN xpv_cur; STRLEN xpv_len; }; */ #define relative_STRUCT_OFFSET(longer, shorter, member) \ (STRUCT_OFFSET(shorter, member) - STRUCT_OFFSET(longer, member)) /* Calculate the length to copy. Specifically work out the length less any final padding the compiler needed to add. See the comment in sv_upgrade for why copying the padding proved to be a bug. */ #define copy_length(type, last_member) \ STRUCT_OFFSET(type, last_member) \ + sizeof (((type*)SvANY((SV*)0))->last_member) static const struct body_details bodies_by_type[] = { { sizeof(HE), 0, 0, SVt_NULL, FALSE, NONV, NOARENA, FIT_ARENA(0, sizeof(HE)) }, /* The bind placeholder pretends to be an RV for now. Also it's marked as "can't upgrade" top stop anyone using it before it's implemented. */ { 0, 0, 0, SVt_BIND, TRUE, NONV, NOARENA, 0 }, /* IVs are in the head, so the allocation size is 0. However, the slot is overloaded for PTEs. */ { sizeof(struct ptr_tbl_ent), /* This is used for PTEs. */ sizeof(IV), /* This is used to copy out the IV body. */ STRUCT_OFFSET(XPVIV, xiv_iv), SVt_IV, FALSE, NONV, NOARENA /* IVS don't need an arena */, /* But PTEs need to know the size of their arena */ FIT_ARENA(0, sizeof(struct ptr_tbl_ent)) }, /* 8 bytes on most ILP32 with IEEE doubles */ { sizeof(NV), sizeof(NV), 0, SVt_NV, FALSE, HADNV, HASARENA, FIT_ARENA(0, sizeof(NV)) }, /* RVs are in the head now. */ { 0, 0, 0, SVt_RV, FALSE, NONV, NOARENA, 0 }, /* 8 bytes on most ILP32 with IEEE doubles */ { sizeof(xpv_allocated), copy_length(XPV, xpv_len) - relative_STRUCT_OFFSET(xpv_allocated, XPV, xpv_cur), + relative_STRUCT_OFFSET(xpv_allocated, XPV, xpv_cur), SVt_PV, FALSE, NONV, HASARENA, FIT_ARENA(0, sizeof(xpv_allocated)) }, /* 12 */ { sizeof(xpviv_allocated), copy_length(XPVIV, xiv_u) - relative_STRUCT_OFFSET(xpviv_allocated, XPVIV, xpv_cur), + relative_STRUCT_OFFSET(xpviv_allocated, XPVIV, xpv_cur), SVt_PVIV, FALSE, NONV, HASARENA, FIT_ARENA(0, sizeof(xpviv_allocated)) }, /* 20 */ { sizeof(XPVNV), copy_length(XPVNV, xiv_u), 0, SVt_PVNV, FALSE, HADNV, HASARENA, FIT_ARENA(0, sizeof(XPVNV)) }, /* 28 */ { sizeof(XPVMG), copy_length(XPVMG, xmg_stash), 0, SVt_PVMG, FALSE, HADNV, HASARENA, FIT_ARENA(0, sizeof(XPVMG)) }, /* 48 */ { sizeof(XPVGV), sizeof(XPVGV), 0, SVt_PVGV, TRUE, HADNV, HASARENA, FIT_ARENA(0, sizeof(XPVGV)) }, /* 64 */ { sizeof(XPVLV), sizeof(XPVLV), 0, SVt_PVLV, TRUE, HADNV, HASARENA, FIT_ARENA(0, sizeof(XPVLV)) }, { sizeof(xpvav_allocated), copy_length(XPVAV, xmg_stash) - relative_STRUCT_OFFSET(xpvav_allocated, XPVAV, xav_fill), + relative_STRUCT_OFFSET(xpvav_allocated, XPVAV, xav_fill), SVt_PVAV, TRUE, HADNV, HASARENA, FIT_ARENA(0, sizeof(xpvav_allocated)) }, { sizeof(xpvhv_allocated), copy_length(XPVHV, xmg_stash) - relative_STRUCT_OFFSET(xpvhv_allocated, XPVHV, xhv_fill), + relative_STRUCT_OFFSET(xpvhv_allocated, XPVHV, xhv_fill), SVt_PVHV, TRUE, HADNV, HASARENA, FIT_ARENA(0, sizeof(xpvhv_allocated)) }, /* 56 */ { sizeof(xpvcv_allocated), sizeof(xpvcv_allocated), + relative_STRUCT_OFFSET(xpvcv_allocated, XPVCV, xpv_cur), SVt_PVCV, TRUE, NONV, HASARENA, FIT_ARENA(0, sizeof(xpvcv_allocated)) }, { sizeof(xpvfm_allocated), sizeof(xpvfm_allocated), + relative_STRUCT_OFFSET(xpvfm_allocated, XPVFM, xpv_cur), SVt_PVFM, TRUE, NONV, NOARENA, FIT_ARENA(20, sizeof(xpvfm_allocated)) }, /* XPVIO is 84 bytes, fits 48x */ { sizeof(XPVIO), sizeof(XPVIO), 0, SVt_PVIO, TRUE, HADNV, HASARENA, FIT_ARENA(24, sizeof(XPVIO)) }, }; #define new_body_type(sv_type) \ (void *)((char *)S_new_body(aTHX_ sv_type)) #define del_body_type(p, sv_type) \ del_body(p, &PL_body_roots[sv_type]) #define new_body_allocated(sv_type) \ (void *)((char *)S_new_body(aTHX_ sv_type) \ - bodies_by_type[sv_type].offset) #define del_body_allocated(p, sv_type) \ del_body(p + bodies_by_type[sv_type].offset, &PL_body_roots[sv_type]) #define my_safemalloc(s) (void*)safemalloc(s) #define my_safecalloc(s) (void*)safecalloc(s, 1) #define my_safefree(p) safefree((char*)p) #ifdef PURIFY #define new_XNV() my_safemalloc(sizeof(XPVNV)) #define del_XNV(p) my_safefree(p) #define new_XPVNV() my_safemalloc(sizeof(XPVNV)) #define del_XPVNV(p) my_safefree(p) #define new_XPVAV() my_safemalloc(sizeof(XPVAV)) #define del_XPVAV(p) my_safefree(p) #define new_XPVHV() my_safemalloc(sizeof(XPVHV)) #define del_XPVHV(p) my_safefree(p) #define new_XPVMG() my_safemalloc(sizeof(XPVMG)) #define del_XPVMG(p) my_safefree(p) #define new_XPVGV() my_safemalloc(sizeof(XPVGV)) #define del_XPVGV(p) my_safefree(p) #else /* !PURIFY */ #define new_XNV() new_body_type(SVt_NV) #define del_XNV(p) del_body_type(p, SVt_NV) #define new_XPVNV() new_body_type(SVt_PVNV) #define del_XPVNV(p) del_body_type(p, SVt_PVNV) #define new_XPVAV() new_body_allocated(SVt_PVAV) #define del_XPVAV(p) del_body_allocated(p, SVt_PVAV) #define new_XPVHV() new_body_allocated(SVt_PVHV) #define del_XPVHV(p) del_body_allocated(p, SVt_PVHV) #define new_XPVMG() new_body_type(SVt_PVMG) #define del_XPVMG(p) del_body_type(p, SVt_PVMG) #define new_XPVGV() new_body_type(SVt_PVGV) #define del_XPVGV(p) del_body_type(p, SVt_PVGV) #endif /* PURIFY */ /* no arena for you! */ #define new_NOARENA(details) \ my_safemalloc((details)->body_size + (details)->offset) #define new_NOARENAZ(details) \ my_safecalloc((details)->body_size + (details)->offset) #if defined(DEBUGGING) && !defined(PERL_GLOBAL_STRUCT_PRIVATE) static bool done_sanity_check; #endif STATIC void * S_more_bodies (pTHX_ svtype sv_type) { dVAR; void ** const root = &PL_body_roots[sv_type]; const struct body_details * const bdp = &bodies_by_type[sv_type]; const size_t body_size = bdp->body_size; char *start; const char *end; assert(bdp->arena_size); #if defined(DEBUGGING) && !defined(PERL_GLOBAL_STRUCT_PRIVATE) /* PERL_GLOBAL_STRUCT_PRIVATE cannot coexist with global * variables like done_sanity_check. */ if (!done_sanity_check) { unsigned int i = SVt_LAST; done_sanity_check = TRUE; while (i--) assert (bodies_by_type[i].type == i); } #endif start = (char*) Perl_get_arena(aTHX_ bdp->arena_size); end = start + bdp->arena_size - body_size; /* computed count doesnt reflect the 1st slot reservation */ DEBUG_m(PerlIO_printf(Perl_debug_log, "arena %p end %p arena-size %d type %d size %d ct %d\n", start, end, (int)bdp->arena_size, sv_type, (int)body_size, (int)bdp->arena_size / (int)body_size)); *root = (void *)start; while (start < end) { char * const next = start + body_size; *(void**) start = (void *)next; start = next; } *(void **)start = 0; return *root; } /* grab a new thing from the free list, allocating more if necessary. The inline version is used for speed in hot routines, and the function using it serves the rest (unless PURIFY). */ #define new_body_inline(xpv, sv_type) \ STMT_START { \ void ** const r3wt = &PL_body_roots[sv_type]; \ LOCK_SV_MUTEX; \ xpv = (PTR_TBL_ENT_t*) (*((void **)(r3wt)) \ ? *((void **)(r3wt)) : more_bodies(sv_type)); \ *(r3wt) = *(void**)(xpv); \ UNLOCK_SV_MUTEX; \ } STMT_END #ifndef PURIFY STATIC void * S_new_body(pTHX_ svtype sv_type) { dVAR; void *xpv; new_body_inline(xpv, sv_type); return xpv; } #endif /* =for apidoc sv_upgrade Upgrade an SV to a more complex form. Generally adds a new body type to the SV, then copies across as much information as possible from the old body. You generally want to use the C macro wrapper. See also C. =cut */ void Perl_sv_upgrade(pTHX_ register SV *sv, svtype new_type) { dVAR; void* old_body; void* new_body; const svtype old_type = SvTYPE(sv); const struct body_details *new_type_details; const struct body_details *const old_type_details = bodies_by_type + old_type; if (new_type != SVt_PV && SvIsCOW(sv)) { sv_force_normal_flags(sv, 0); } if (old_type == new_type) return; if (old_type > new_type) Perl_croak(aTHX_ "sv_upgrade from type %d down to type %d", (int)old_type, (int)new_type); old_body = SvANY(sv); /* Copying structures onto other structures that have been neatly zeroed has a subtle gotcha. Consider XPVMG +------+------+------+------+------+-------+-------+ | NV | CUR | LEN | IV | MAGIC | STASH | +------+------+------+------+------+-------+-------+ 0 4 8 12 16 20 24 28 where NVs are aligned to 8 bytes, so that sizeof that structure is actually 32 bytes long, with 4 bytes of padding at the end: +------+------+------+------+------+-------+-------+------+ | NV | CUR | LEN | IV | MAGIC | STASH | ??? | +------+------+------+------+------+-------+-------+------+ 0 4 8 12 16 20 24 28 32 so what happens if you allocate memory for this structure: +------+------+------+------+------+-------+-------+------+------+... | NV | CUR | LEN | IV | MAGIC | STASH | GP | NAME | +------+------+------+------+------+-------+-------+------+------+... 0 4 8 12 16 20 24 28 32 36 zero it, then copy sizeof(XPVMG) bytes on top of it? Not quite what you expect, because you copy the area marked ??? onto GP. Now, ??? may have started out as zero once, but it's quite possible that it isn't. So now, rather than a nicely zeroed GP, you have it pointing somewhere random. Bugs ensue. (In fact, GP ends up pointing at a previous GP structure, because the principle cause of the padding in XPVMG getting garbage is a copy of sizeof(XPVMG) bytes from a XPVGV structure in sv_unglob) So we are careful and work out the size of used parts of all the structures. */ switch (old_type) { case SVt_NULL: break; case SVt_IV: if (new_type < SVt_PVIV) { new_type = (new_type == SVt_NV) ? SVt_PVNV : SVt_PVIV; } break; case SVt_NV: if (new_type < SVt_PVNV) { new_type = SVt_PVNV; } break; case SVt_RV: break; case SVt_PV: assert(new_type > SVt_PV); assert(SVt_IV < SVt_PV); assert(SVt_NV < SVt_PV); break; case SVt_PVIV: break; case SVt_PVNV: break; case SVt_PVMG: /* Because the XPVMG of PL_mess_sv isn't allocated from the arena, there's no way that it can be safely upgraded, because perl.c expects to Safefree(SvANY(PL_mess_sv)) */ assert(sv != PL_mess_sv); /* This flag bit is used to mean other things in other scalar types. Given that it only has meaning inside the pad, it shouldn't be set on anything that can get upgraded. */ assert(!SvPAD_TYPED(sv)); break; default: if (old_type_details->cant_upgrade) Perl_croak(aTHX_ "Can't upgrade %s (%" UVuf ") to %" UVuf, sv_reftype(sv, 0), (UV) old_type, (UV) new_type); } new_type_details = bodies_by_type + new_type; SvFLAGS(sv) &= ~SVTYPEMASK; SvFLAGS(sv) |= new_type; /* This can't happen, as SVt_NULL is <= all values of new_type, so one of the return statements above will have triggered. */ assert (new_type != SVt_NULL); switch (new_type) { case SVt_IV: assert(old_type == SVt_NULL); SvANY(sv) = (XPVIV*)((char*)&(sv->sv_u.svu_iv) - STRUCT_OFFSET(XPVIV, xiv_iv)); SvIV_set(sv, 0); return; case SVt_NV: assert(old_type == SVt_NULL); SvANY(sv) = new_XNV(); SvNV_set(sv, 0); return; case SVt_RV: assert(old_type == SVt_NULL); SvANY(sv) = &sv->sv_u.svu_rv; SvRV_set(sv, 0); return; case SVt_PVHV: case SVt_PVAV: assert(new_type_details->body_size); #ifndef PURIFY assert(new_type_details->arena); assert(new_type_details->arena_size); /* This points to the start of the allocated area. */ new_body_inline(new_body, new_type); Zero(new_body, new_type_details->body_size, char); new_body = ((char *)new_body) - new_type_details->offset; #else /* We always allocated the full length item with PURIFY. To do this we fake things so that arena is false for all 16 types.. */ new_body = new_NOARENAZ(new_type_details); #endif SvANY(sv) = new_body; if (new_type == SVt_PVAV) { AvMAX(sv) = -1; AvFILLp(sv) = -1; AvREAL_only(sv); } /* SVt_NULL isn't the only thing upgraded to AV or HV. The target created by newSVrv also is, and it can have magic. However, it never has SvPVX set. */ if (old_type >= SVt_RV) { assert(SvPVX_const(sv) == 0); } if (old_type >= SVt_PVMG) { SvMAGIC_set(sv, ((XPVMG*)old_body)->xmg_u.xmg_magic); SvSTASH_set(sv, ((XPVMG*)old_body)->xmg_stash); } else { sv->sv_u.svu_array = NULL; /* or svu_hash */ } break; case SVt_PVIV: /* XXX Is this still needed? Was it ever needed? Surely as there is no route from NV to PVIV, NOK can never be true */ assert(!SvNOKp(sv)); assert(!SvNOK(sv)); case SVt_PVIO: case SVt_PVFM: case SVt_PVGV: case SVt_PVCV: case SVt_PVLV: case SVt_PVMG: case SVt_PVNV: case SVt_PV: assert(new_type_details->body_size); /* We always allocated the full length item with PURIFY. To do this we fake things so that arena is false for all 16 types.. */ if(new_type_details->arena) { /* This points to the start of the allocated area. */ new_body_inline(new_body, new_type); Zero(new_body, new_type_details->body_size, char); new_body = ((char *)new_body) - new_type_details->offset; } else { new_body = new_NOARENAZ(new_type_details); } SvANY(sv) = new_body; if (old_type_details->copy) { /* There is now the potential for an upgrade from something without an offset (PVNV or PVMG) to something with one (PVCV, PVFM) */ int offset = old_type_details->offset; int length = old_type_details->copy; if (new_type_details->offset > old_type_details->offset) { const int difference = new_type_details->offset - old_type_details->offset; offset += difference; length -= difference; } assert (length >= 0); Copy((char *)old_body + offset, (char *)new_body + offset, length, char); } #ifndef NV_ZERO_IS_ALLBITS_ZERO /* If NV 0.0 is stores as all bits 0 then Zero() already creates a * correct 0.0 for us. Otherwise, if the old body didn't have an * NV slot, but the new one does, then we need to initialise the * freshly created NV slot with whatever the correct bit pattern is * for 0.0 */ if (old_type_details->zero_nv && !new_type_details->zero_nv) SvNV_set(sv, 0); #endif if (new_type == SVt_PVIO) IoPAGE_LEN(sv) = 60; if (old_type < SVt_RV) SvPV_set(sv, NULL); break; default: Perl_croak(aTHX_ "panic: sv_upgrade to unknown type %lu", (unsigned long)new_type); } if (old_type_details->arena) { /* If there was an old body, then we need to free it. Note that there is an assumption that all bodies of types that can be upgraded came from arenas. Only the more complex non- upgradable types are allowed to be directly malloc()ed. */ #ifdef PURIFY my_safefree(old_body); #else del_body((void*)((char*)old_body + old_type_details->offset), &PL_body_roots[old_type]); #endif } } /* =for apidoc sv_backoff Remove any string offset. You should normally use the C macro wrapper instead. =cut */ int Perl_sv_backoff(pTHX_ register SV *sv) { PERL_UNUSED_CONTEXT; assert(SvOOK(sv)); assert(SvTYPE(sv) != SVt_PVHV); assert(SvTYPE(sv) != SVt_PVAV); if (SvIVX(sv)) { const char * const s = SvPVX_const(sv); SvLEN_set(sv, SvLEN(sv) + SvIVX(sv)); SvPV_set(sv, SvPVX(sv) - SvIVX(sv)); SvIV_set(sv, 0); Move(s, SvPVX(sv), SvCUR(sv)+1, char); } SvFLAGS(sv) &= ~SVf_OOK; return 0; } /* =for apidoc sv_grow Expands the character buffer in the SV. If necessary, uses C and upgrades the SV to C. Returns a pointer to the character buffer. Use the C wrapper instead. =cut */ char * Perl_sv_grow(pTHX_ register SV *sv, register STRLEN newlen) { register char *s; if (PL_madskills && newlen >= 0x100000) { PerlIO_printf(Perl_debug_log, "Allocation too large: %"UVxf"\n", (UV)newlen); } #ifdef HAS_64K_LIMIT if (newlen >= 0x10000) { PerlIO_printf(Perl_debug_log, "Allocation too large: %"UVxf"\n", (UV)newlen); my_exit(1); } #endif /* HAS_64K_LIMIT */ if (SvROK(sv)) sv_unref(sv); if (SvTYPE(sv) < SVt_PV) { sv_upgrade(sv, SVt_PV); s = SvPVX_mutable(sv); } else if (SvOOK(sv)) { /* pv is offset? */ sv_backoff(sv); s = SvPVX_mutable(sv); if (newlen > SvLEN(sv)) newlen += 10 * (newlen - SvCUR(sv)); /* avoid copy each time */ #ifdef HAS_64K_LIMIT if (newlen >= 0x10000) newlen = 0xFFFF; #endif } else s = SvPVX_mutable(sv); if (newlen > SvLEN(sv)) { /* need more room? */ newlen = PERL_STRLEN_ROUNDUP(newlen); if (SvLEN(sv) && s) { #ifdef MYMALLOC const STRLEN l = malloced_size((void*)SvPVX_const(sv)); if (newlen <= l) { SvLEN_set(sv, l); return s; } else #endif s = (char*)saferealloc(s, newlen); } else { s = (char*)safemalloc(newlen); if (SvPVX_const(sv) && SvCUR(sv)) { Move(SvPVX_const(sv), s, (newlen < SvCUR(sv)) ? newlen : SvCUR(sv), char); } } SvPV_set(sv, s); SvLEN_set(sv, newlen); } return s; } /* =for apidoc sv_setiv Copies an integer into the given SV, upgrading first if necessary. Does not handle 'set' magic. See also C. =cut */ void Perl_sv_setiv(pTHX_ register SV *sv, IV i) { dVAR; SV_CHECK_THINKFIRST_COW_DROP(sv); switch (SvTYPE(sv)) { case SVt_NULL: sv_upgrade(sv, SVt_IV); break; case SVt_NV: sv_upgrade(sv, SVt_PVNV); break; case SVt_RV: case SVt_PV: sv_upgrade(sv, SVt_PVIV); break; case SVt_PVGV: case SVt_PVAV: case SVt_PVHV: case SVt_PVCV: case SVt_PVFM: case SVt_PVIO: Perl_croak(aTHX_ "Can't coerce %s to integer in %s", sv_reftype(sv,0), OP_DESC(PL_op)); default: NOOP; } (void)SvIOK_only(sv); /* validate number */ SvIV_set(sv, i); SvTAINT(sv); } /* =for apidoc sv_setiv_mg Like C, but also handles 'set' magic. =cut */ void Perl_sv_setiv_mg(pTHX_ register SV *sv, IV i) { sv_setiv(sv,i); SvSETMAGIC(sv); } /* =for apidoc sv_setuv Copies an unsigned integer into the given SV, upgrading first if necessary. Does not handle 'set' magic. See also C. =cut */ void Perl_sv_setuv(pTHX_ register SV *sv, UV u) { /* With these two if statements: u=1.49 s=0.52 cu=72.49 cs=10.64 scripts=270 tests=20865 without u=1.35 s=0.47 cu=73.45 cs=11.43 scripts=270 tests=20865 If you wish to remove them, please benchmark to see what the effect is */ if (u <= (UV)IV_MAX) { sv_setiv(sv, (IV)u); return; } sv_setiv(sv, 0); SvIsUV_on(sv); SvUV_set(sv, u); } /* =for apidoc sv_setuv_mg Like C, but also handles 'set' magic. =cut */ void Perl_sv_setuv_mg(pTHX_ register SV *sv, UV u) { sv_setuv(sv,u); SvSETMAGIC(sv); } /* =for apidoc sv_setnv Copies a double into the given SV, upgrading first if necessary. Does not handle 'set' magic. See also C. =cut */ void Perl_sv_setnv(pTHX_ register SV *sv, NV num) { dVAR; SV_CHECK_THINKFIRST_COW_DROP(sv); switch (SvTYPE(sv)) { case SVt_NULL: case SVt_IV: sv_upgrade(sv, SVt_NV); break; case SVt_RV: case SVt_PV: case SVt_PVIV: sv_upgrade(sv, SVt_PVNV); break; case SVt_PVGV: case SVt_PVAV: case SVt_PVHV: case SVt_PVCV: case SVt_PVFM: case SVt_PVIO: Perl_croak(aTHX_ "Can't coerce %s to number in %s", sv_reftype(sv,0), OP_NAME(PL_op)); default: NOOP; } SvNV_set(sv, num); (void)SvNOK_only(sv); /* validate number */ SvTAINT(sv); } /* =for apidoc sv_setnv_mg Like C, but also handles 'set' magic. =cut */ void Perl_sv_setnv_mg(pTHX_ register SV *sv, NV num) { sv_setnv(sv,num); SvSETMAGIC(sv); } /* Print an "isn't numeric" warning, using a cleaned-up, * printable version of the offending string */ STATIC void S_not_a_number(pTHX_ SV *sv) { dVAR; SV *dsv; char tmpbuf[64]; const char *pv; if (DO_UTF8(sv)) { dsv = sv_2mortal(newSVpvs("")); pv = sv_uni_display(dsv, sv, 10, 0); } else { char *d = tmpbuf; const char * const limit = tmpbuf + sizeof(tmpbuf) - 8; /* each *s can expand to 4 chars + "...\0", i.e. need room for 8 chars */ const char *s = SvPVX_const(sv); const char * const end = s + SvCUR(sv); for ( ; s < end && d < limit; s++ ) { int ch = *s & 0xFF; if (ch & 128 && !isPRINT_LC(ch)) { *d++ = 'M'; *d++ = '-'; ch &= 127; } if (ch == '\n') { *d++ = '\\'; *d++ = 'n'; } else if (ch == '\r') { *d++ = '\\'; *d++ = 'r'; } else if (ch == '\f') { *d++ = '\\'; *d++ = 'f'; } else if (ch == '\\') { *d++ = '\\'; *d++ = '\\'; } else if (ch == '\0') { *d++ = '\\'; *d++ = '0'; } else if (isPRINT_LC(ch)) *d++ = ch; else { *d++ = '^'; *d++ = toCTRL(ch); } } if (s < end) { *d++ = '.'; *d++ = '.'; *d++ = '.'; } *d = '\0'; pv = tmpbuf; } if (PL_op) Perl_warner(aTHX_ packWARN(WARN_NUMERIC), "Argument \"%s\" isn't numeric in %s", pv, OP_DESC(PL_op)); else Perl_warner(aTHX_ packWARN(WARN_NUMERIC), "Argument \"%s\" isn't numeric", pv); } /* =for apidoc looks_like_number Test if the content of an SV looks like a number (or is a number). C and C are treated as numbers (so will not issue a non-numeric warning), even if your atof() doesn't grok them. =cut */ I32 Perl_looks_like_number(pTHX_ SV *sv) { register const char *sbegin; STRLEN len; if (SvPOK(sv)) { sbegin = SvPVX_const(sv); len = SvCUR(sv); } else if (SvPOKp(sv)) sbegin = SvPV_const(sv, len); else return SvFLAGS(sv) & (SVf_NOK|SVp_NOK|SVf_IOK|SVp_IOK); return grok_number(sbegin, len, NULL); } STATIC bool S_glob_2number(pTHX_ GV * const gv) { const U32 wasfake = SvFLAGS(gv) & SVf_FAKE; SV *const buffer = sv_newmortal(); /* FAKE globs can get coerced, so need to turn this off temporarily if it is on. */ SvFAKE_off(gv); gv_efullname3(buffer, gv, "*"); SvFLAGS(gv) |= wasfake; /* We know that all GVs stringify to something that is not-a-number, so no need to test that. */ if (ckWARN(WARN_NUMERIC)) not_a_number(buffer); /* We just want something true to return, so that S_sv_2iuv_common can tail call us and return true. */ return TRUE; } STATIC char * S_glob_2pv(pTHX_ GV * const gv, STRLEN * const len) { const U32 wasfake = SvFLAGS(gv) & SVf_FAKE; SV *const buffer = sv_newmortal(); /* FAKE globs can get coerced, so need to turn this off temporarily if it is on. */ SvFAKE_off(gv); gv_efullname3(buffer, gv, "*"); SvFLAGS(gv) |= wasfake; assert(SvPOK(buffer)); if (len) { *len = SvCUR(buffer); } return SvPVX(buffer); } /* Actually, ISO C leaves conversion of UV to IV undefined, but until proven guilty, assume that things are not that bad... */ /* NV_PRESERVES_UV: As 64 bit platforms often have an NV that doesn't preserve all bits of an IV (an assumption perl has been based on to date) it becomes necessary to remove the assumption that the NV always carries enough precision to recreate the IV whenever needed, and that the NV is the canonical form. Instead, IV/UV and NV need to be given equal rights. So as to not lose precision as a side effect of conversion (which would lead to insanity and the dragon(s) in t/op/numconvert.t getting very angry) the intent is 1) to distinguish between IV/UV/NV slots that have cached a valid conversion where precision was lost and IV/UV/NV slots that have a valid conversion which has lost no precision 2) to ensure that if a numeric conversion to one form is requested that would lose precision, the precise conversion (or differently imprecise conversion) is also performed and cached, to prevent requests for different numeric formats on the same SV causing lossy conversion chains. (lossless conversion chains are perfectly acceptable (still)) flags are used: SvIOKp is true if the IV slot contains a valid value SvIOK is true only if the IV value is accurate (UV if SvIOK_UV true) SvNOKp is true if the NV slot contains a valid value SvNOK is true only if the NV value is accurate so while converting from PV to NV, check to see if converting that NV to an IV(or UV) would lose accuracy over a direct conversion from PV to IV(or UV). If it would, cache both conversions, return NV, but mark SV as IOK NOKp (ie not NOK). While converting from PV to IV, check to see if converting that IV to an NV would lose accuracy over a direct conversion from PV to NV. If it would, cache both conversions, flag similarly. Before, the SV value "3.2" could become NV=3.2 IV=3 NOK, IOK quite correctly because if IV & NV were set NV *always* overruled. Now, "3.2" will become NV=3.2 IV=3 NOK, IOKp, because the flag's meaning changes - now IV and NV together means that the two are interchangeable: SvIVX == (IV) SvNVX && SvNVX == (NV) SvIVX; The benefit of this is that operations such as pp_add know that if SvIOK is true for both left and right operands, then integer addition can be used instead of floating point (for cases where the result won't overflow). Before, floating point was always used, which could lead to loss of precision compared with integer addition. * making IV and NV equal status should make maths accurate on 64 bit platforms * may speed up maths somewhat if pp_add and friends start to use integers when possible instead of fp. (Hopefully the overhead in looking for SvIOK and checking for overflow will not outweigh the fp to integer speedup) * will slow down integer operations (callers of SvIV) on "inaccurate" values, as the change from SvIOK to SvIOKp will cause a call into sv_2iv each time rather than a macro access direct to the IV slot * should speed up number->string conversion on integers as IV is favoured when IV and NV are equally accurate #################################################################### You had better be using SvIOK_notUV if you want an IV for arithmetic: SvIOK is true if (IV or UV), so you might be getting (IV)SvUV. On the other hand, SvUOK is true iff UV. #################################################################### Your mileage will vary depending your CPU's relative fp to integer performance ratio. */ #ifndef NV_PRESERVES_UV # define IS_NUMBER_UNDERFLOW_IV 1 # define IS_NUMBER_UNDERFLOW_UV 2 # define IS_NUMBER_IV_AND_UV 2 # define IS_NUMBER_OVERFLOW_IV 4 # define IS_NUMBER_OVERFLOW_UV 5 /* sv_2iuv_non_preserve(): private routine for use by sv_2iv() and sv_2uv() */ /* For sv_2nv these three cases are "SvNOK and don't bother casting" */ STATIC int S_sv_2iuv_non_preserve(pTHX_ register SV *sv, I32 numtype) { dVAR; PERL_UNUSED_ARG(numtype); /* Used only under DEBUGGING? */ DEBUG_c(PerlIO_printf(Perl_debug_log,"sv_2iuv_non '%s', IV=0x%"UVxf" NV=%"NVgf" inttype=%"UVXf"\n", SvPVX_const(sv), SvIVX(sv), SvNVX(sv), (UV)numtype)); if (SvNVX(sv) < (NV)IV_MIN) { (void)SvIOKp_on(sv); (void)SvNOK_on(sv); SvIV_set(sv, IV_MIN); return IS_NUMBER_UNDERFLOW_IV; } if (SvNVX(sv) > (NV)UV_MAX) { (void)SvIOKp_on(sv); (void)SvNOK_on(sv); SvIsUV_on(sv); SvUV_set(sv, UV_MAX); return IS_NUMBER_OVERFLOW_UV; } (void)SvIOKp_on(sv); (void)SvNOK_on(sv); /* Can't use strtol etc to convert this string. (See truth table in sv_2iv */ if (SvNVX(sv) <= (UV)IV_MAX) { SvIV_set(sv, I_V(SvNVX(sv))); if ((NV)(SvIVX(sv)) == SvNVX(sv)) { SvIOK_on(sv); /* Integer is precise. NOK, IOK */ } else { /* Integer is imprecise. NOK, IOKp */ } return SvNVX(sv) < 0 ? IS_NUMBER_UNDERFLOW_UV : IS_NUMBER_IV_AND_UV; } SvIsUV_on(sv); SvUV_set(sv, U_V(SvNVX(sv))); if ((NV)(SvUVX(sv)) == SvNVX(sv)) { if (SvUVX(sv) == UV_MAX) { /* As we know that NVs don't preserve UVs, UV_MAX cannot possibly be preserved by NV. Hence, it must be overflow. NOK, IOKp */ return IS_NUMBER_OVERFLOW_UV; } SvIOK_on(sv); /* Integer is precise. NOK, UOK */ } else { /* Integer is imprecise. NOK, IOKp */ } return IS_NUMBER_OVERFLOW_IV; } #endif /* !NV_PRESERVES_UV*/ STATIC bool S_sv_2iuv_common(pTHX_ SV *sv) { dVAR; if (SvNOKp(sv)) { /* erm. not sure. *should* never get NOKp (without NOK) from sv_2nv * without also getting a cached IV/UV from it at the same time * (ie PV->NV conversion should detect loss of accuracy and cache * IV or UV at same time to avoid this. */ /* IV-over-UV optimisation - choose to cache IV if possible */ if (SvTYPE(sv) == SVt_NV) sv_upgrade(sv, SVt_PVNV); (void)SvIOKp_on(sv); /* Must do this first, to clear any SvOOK */ /* < not <= as for NV doesn't preserve UV, ((NV)IV_MAX+1) will almost certainly cast into the IV range at IV_MAX, whereas the correct answer is the UV IV_MAX +1. Hence < ensures that dodgy boundary cases go to UV */ #if defined(NAN_COMPARE_BROKEN) && defined(Perl_isnan) if (Perl_isnan(SvNVX(sv))) { SvUV_set(sv, 0); SvIsUV_on(sv); return FALSE; } #endif if (SvNVX(sv) < (NV)IV_MAX + 0.5) { SvIV_set(sv, I_V(SvNVX(sv))); if (SvNVX(sv) == (NV) SvIVX(sv) #ifndef NV_PRESERVES_UV && (((UV)1 << NV_PRESERVES_UV_BITS) > (UV)(SvIVX(sv) > 0 ? SvIVX(sv) : -SvIVX(sv))) /* Don't flag it as "accurately an integer" if the number came from a (by definition imprecise) NV operation, and we're outside the range of NV integer precision */ #endif ) { SvIOK_on(sv); /* Can this go wrong with rounding? NWC */ DEBUG_c(PerlIO_printf(Perl_debug_log, "0x%"UVxf" iv(%"NVgf" => %"IVdf") (precise)\n", PTR2UV(sv), SvNVX(sv), SvIVX(sv))); } else { /* IV not precise. No need to convert from PV, as NV conversion would already have cached IV if it detected that PV->IV would be better than PV->NV->IV flags already correct - don't set public IOK. */ DEBUG_c(PerlIO_printf(Perl_debug_log, "0x%"UVxf" iv(%"NVgf" => %"IVdf") (imprecise)\n", PTR2UV(sv), SvNVX(sv), SvIVX(sv))); } /* Can the above go wrong if SvIVX == IV_MIN and SvNVX < IV_MIN, but the cast (NV)IV_MIN rounds to a the value less (more negative) than IV_MIN which happens to be equal to SvNVX ?? Analogous to 0xFFFFFFFFFFFFFFFF rounding up to NV (2**64) and NV rounding back to 0xFFFFFFFFFFFFFFFF, so UVX == UV(NVX) and (NV)UVX == NVX are both true, but the values differ. :-( Hopefully for 2s complement IV_MIN is something like 0x8000000000000000 which will be exact. NWC */ } else { SvUV_set(sv, U_V(SvNVX(sv))); if ( (SvNVX(sv) == (NV) SvUVX(sv)) #ifndef NV_PRESERVES_UV /* Make sure it's not 0xFFFFFFFFFFFFFFFF */ /*&& (SvUVX(sv) != UV_MAX) irrelevant with code below */ && (((UV)1 << NV_PRESERVES_UV_BITS) > SvUVX(sv)) /* Don't flag it as "accurately an integer" if the number came from a (by definition imprecise) NV operation, and we're outside the range of NV integer precision */ #endif ) SvIOK_on(sv); SvIsUV_on(sv); DEBUG_c(PerlIO_printf(Perl_debug_log, "0x%"UVxf" 2iv(%"UVuf" => %"IVdf") (as unsigned)\n", PTR2UV(sv), SvUVX(sv), SvUVX(sv))); } } else if (SvPOKp(sv) && SvLEN(sv)) { UV value; const int numtype = grok_number(SvPVX_const(sv), SvCUR(sv), &value); /* We want to avoid a possible problem when we cache an IV/ a UV which may be later translated to an NV, and the resulting NV is not the same as the direct translation of the initial string (eg 123.456 can shortcut to the IV 123 with atol(), but we must be careful to ensure that the value with the .456 is around if the NV value is requested in the future). This means that if we cache such an IV/a UV, we need to cache the NV as well. Moreover, we trade speed for space, and do not cache the NV if we are sure it's not needed. */ /* SVt_PVNV is one higher than SVt_PVIV, hence this order */ if ((numtype & (IS_NUMBER_IN_UV | IS_NUMBER_NOT_INT)) == IS_NUMBER_IN_UV) { /* It's definitely an integer, only upgrade to PVIV */ if (SvTYPE(sv) < SVt_PVIV) sv_upgrade(sv, SVt_PVIV); (void)SvIOK_on(sv); } else if (SvTYPE(sv) < SVt_PVNV) sv_upgrade(sv, SVt_PVNV); /* If NVs preserve UVs then we only use the UV value if we know that we aren't going to call atof() below. If NVs don't preserve UVs then the value returned may have more precision than atof() will return, even though value isn't perfectly accurate. */ if ((numtype & (IS_NUMBER_IN_UV #ifdef NV_PRESERVES_UV | IS_NUMBER_NOT_INT #endif )) == IS_NUMBER_IN_UV) { /* This won't turn off the public IOK flag if it was set above */ (void)SvIOKp_on(sv); if (!(numtype & IS_NUMBER_NEG)) { /* positive */; if (value <= (UV)IV_MAX) { SvIV_set(sv, (IV)value); } else { /* it didn't overflow, and it was positive. */ SvUV_set(sv, value); SvIsUV_on(sv); } } else { /* 2s complement assumption */ if (value <= (UV)IV_MIN) { SvIV_set(sv, -(IV)value); } else { /* Too negative for an IV. This is a double upgrade, but I'm assuming it will be rare. */ if (SvTYPE(sv) < SVt_PVNV) sv_upgrade(sv, SVt_PVNV); SvNOK_on(sv); SvIOK_off(sv); SvIOKp_on(sv); SvNV_set(sv, -(NV)value); SvIV_set(sv, IV_MIN); } } } /* For !NV_PRESERVES_UV and IS_NUMBER_IN_UV and IS_NUMBER_NOT_INT we will be in the previous block to set the IV slot, and the next block to set the NV slot. So no else here. */ if ((numtype & (IS_NUMBER_IN_UV | IS_NUMBER_NOT_INT)) != IS_NUMBER_IN_UV) { /* It wasn't an (integer that doesn't overflow the UV). */ SvNV_set(sv, Atof(SvPVX_const(sv))); if (! numtype && ckWARN(WARN_NUMERIC)) not_a_number(sv); #if defined(USE_LONG_DOUBLE) DEBUG_c(PerlIO_printf(Perl_debug_log, "0x%"UVxf" 2iv(%" PERL_PRIgldbl ")\n", PTR2UV(sv), SvNVX(sv))); #else DEBUG_c(PerlIO_printf(Perl_debug_log, "0x%"UVxf" 2iv(%"NVgf")\n", PTR2UV(sv), SvNVX(sv))); #endif #ifdef NV_PRESERVES_UV (void)SvIOKp_on(sv); (void)SvNOK_on(sv); if (SvNVX(sv) < (NV)IV_MAX + 0.5) { SvIV_set(sv, I_V(SvNVX(sv))); if ((NV)(SvIVX(sv)) == SvNVX(sv)) { SvIOK_on(sv); } else { NOOP; /* Integer is imprecise. NOK, IOKp */ } /* UV will not work better than IV */ } else { if (SvNVX(sv) > (NV)UV_MAX) { SvIsUV_on(sv); /* Integer is inaccurate. NOK, IOKp, is UV */ SvUV_set(sv, UV_MAX); } else { SvUV_set(sv, U_V(SvNVX(sv))); /* 0xFFFFFFFFFFFFFFFF not an issue in here, NVs NV preservse UV so can do correct comparison. */ if ((NV)(SvUVX(sv)) == SvNVX(sv)) { SvIOK_on(sv); } else { NOOP; /* Integer is imprecise. NOK, IOKp, is UV */ } } SvIsUV_on(sv); } #else /* NV_PRESERVES_UV */ if ((numtype & (IS_NUMBER_IN_UV | IS_NUMBER_NOT_INT)) == (IS_NUMBER_IN_UV | IS_NUMBER_NOT_INT)) { /* The IV/UV slot will have been set from value returned by grok_number above. The NV slot has just been set using Atof. */ SvNOK_on(sv); assert (SvIOKp(sv)); } else { if (((UV)1 << NV_PRESERVES_UV_BITS) > U_V(SvNVX(sv) > 0 ? SvNVX(sv) : -SvNVX(sv))) { /* Small enough to preserve all bits. */ (void)SvIOKp_on(sv); SvNOK_on(sv); SvIV_set(sv, I_V(SvNVX(sv))); if ((NV)(SvIVX(sv)) == SvNVX(sv)) SvIOK_on(sv); /* Assumption: first non-preserved integer is < IV_MAX, this NV is in the preserved range, therefore: */ if (!(U_V(SvNVX(sv) > 0 ? SvNVX(sv) : -SvNVX(sv)) < (UV)IV_MAX)) { Perl_croak(aTHX_ "sv_2iv assumed (U_V(fabs((double)SvNVX(sv))) < (UV)IV_MAX) but SvNVX(sv)=%"NVgf" U_V is 0x%"UVxf", IV_MAX is 0x%"UVxf"\n", SvNVX(sv), U_V(SvNVX(sv)), (UV)IV_MAX); } } else { /* IN_UV NOT_INT 0 0 already failed to read UV. 0 1 already failed to read UV. 1 0 you won't get here in this case. IV/UV slot set, public IOK, Atof() unneeded. 1 1 already read UV. so there's no point in sv_2iuv_non_preserve() attempting to use atol, strtol, strtoul etc. */ sv_2iuv_non_preserve (sv, numtype); } } #endif /* NV_PRESERVES_UV */ } } else { if (isGV_with_GP(sv)) return glob_2number((GV *)sv); if (!(SvFLAGS(sv) & SVs_PADTMP)) { if (!PL_localizing && ckWARN(WARN_UNINITIALIZED)) report_uninit(sv); } if (SvTYPE(sv) < SVt_IV) /* Typically the caller expects that sv_any is not NULL now. */ sv_upgrade(sv, SVt_IV); /* Return 0 from the caller. */ return TRUE; } return FALSE; } /* =for apidoc sv_2iv_flags Return the integer value of an SV, doing any necessary string conversion. If flags includes SV_GMAGIC, does an mg_get() first. Normally used via the C and C macros. =cut */ IV Perl_sv_2iv_flags(pTHX_ register SV *sv, I32 flags) { dVAR; if (!sv) return 0; if (SvGMAGICAL(sv) || (SvTYPE(sv) == SVt_PVGV && SvVALID(sv))) { /* FBMs use the same flag bit as SVf_IVisUV, so must let them cache IVs just in case. In practice it seems that they never actually anywhere accessible by user Perl code, let alone get used in anything other than a string context. */ if (flags & SV_GMAGIC) mg_get(sv); if (SvIOKp(sv)) return SvIVX(sv); if (SvNOKp(sv)) { return I_V(SvNVX(sv)); } if (SvPOKp(sv) && SvLEN(sv)) { UV value; const int numtype = grok_number(SvPVX_const(sv), SvCUR(sv), &value); if ((numtype & (IS_NUMBER_IN_UV | IS_NUMBER_NOT_INT)) == IS_NUMBER_IN_UV) { /* It's definitely an integer */ if (numtype & IS_NUMBER_NEG) { if (value < (UV)IV_MIN) return -(IV)value; } else { if (value < (UV)IV_MAX) return (IV)value; } } if (!numtype) { if (ckWARN(WARN_NUMERIC)) not_a_number(sv); } return I_V(Atof(SvPVX_const(sv))); } if (SvROK(sv)) { goto return_rok; } assert(SvTYPE(sv) >= SVt_PVMG); /* This falls through to the report_uninit inside S_sv_2iuv_common. */ } else if (SvTHINKFIRST(sv)) { if (SvROK(sv)) { return_rok: if (SvAMAGIC(sv)) { SV * const tmpstr=AMG_CALLun(sv,numer); if (tmpstr && (!SvROK(tmpstr) || (SvRV(tmpstr) != SvRV(sv)))) { return SvIV(tmpstr); } } return PTR2IV(SvRV(sv)); } if (SvIsCOW(sv)) { sv_force_normal_flags(sv, 0); } if (SvREADONLY(sv) && !SvOK(sv)) { if (ckWARN(WARN_UNINITIALIZED)) report_uninit(sv); return 0; } } if (!SvIOKp(sv)) { if (S_sv_2iuv_common(aTHX_ sv)) return 0; } DEBUG_c(PerlIO_printf(Perl_debug_log, "0x%"UVxf" 2iv(%"IVdf")\n", PTR2UV(sv),SvIVX(sv))); return SvIsUV(sv) ? (IV)SvUVX(sv) : SvIVX(sv); } /* =for apidoc sv_2uv_flags Return the unsigned integer value of an SV, doing any necessary string conversion. If flags includes SV_GMAGIC, does an mg_get() first. Normally used via the C and C macros. =cut */ UV Perl_sv_2uv_flags(pTHX_ register SV *sv, I32 flags) { dVAR; if (!sv) return 0; if (SvGMAGICAL(sv) || (SvTYPE(sv) == SVt_PVGV && SvVALID(sv))) { /* FBMs use the same flag bit as SVf_IVisUV, so must let them cache IVs just in case. */ if (flags & SV_GMAGIC) mg_get(sv); if (SvIOKp(sv)) return SvUVX(sv); if (SvNOKp(sv)) return U_V(SvNVX(sv)); if (SvPOKp(sv) && SvLEN(sv)) { UV value; const int numtype = grok_number(SvPVX_const(sv), SvCUR(sv), &value); if ((numtype & (IS_NUMBER_IN_UV | IS_NUMBER_NOT_INT)) == IS_NUMBER_IN_UV) { /* It's definitely an integer */ if (!(numtype & IS_NUMBER_NEG)) return value; } if (!numtype) { if (ckWARN(WARN_NUMERIC)) not_a_number(sv); } return U_V(Atof(SvPVX_const(sv))); } if (SvROK(sv)) { goto return_rok; } assert(SvTYPE(sv) >= SVt_PVMG); /* This falls through to the report_uninit inside S_sv_2iuv_common. */ } else if (SvTHINKFIRST(sv)) { if (SvROK(sv)) { return_rok: if (SvAMAGIC(sv)) { SV *const tmpstr = AMG_CALLun(sv,numer); if (tmpstr && (!SvROK(tmpstr) || (SvRV(tmpstr) != SvRV(sv)))) { return SvUV(tmpstr); } } return PTR2UV(SvRV(sv)); } if (SvIsCOW(sv)) { sv_force_normal_flags(sv, 0); } if (SvREADONLY(sv) && !SvOK(sv)) { if (ckWARN(WARN_UNINITIALIZED)) report_uninit(sv); return 0; } } if (!SvIOKp(sv)) { if (S_sv_2iuv_common(aTHX_ sv)) return 0; } DEBUG_c(PerlIO_printf(Perl_debug_log, "0x%"UVxf" 2uv(%"UVuf")\n", PTR2UV(sv),SvUVX(sv))); return SvIsUV(sv) ? SvUVX(sv) : (UV)SvIVX(sv); } /* =for apidoc sv_2nv Return the num value of an SV, doing any necessary string or integer conversion, magic etc. Normally used via the C and C macros. =cut */ NV Perl_sv_2nv(pTHX_ register SV *sv) { dVAR; if (!sv) return 0.0; if (SvGMAGICAL(sv) || (SvTYPE(sv) == SVt_PVGV && SvVALID(sv))) { /* FBMs use the same flag bit as SVf_IVisUV, so must let them cache IVs just in case. */ mg_get(sv); if (SvNOKp(sv)) return SvNVX(sv); if ((SvPOKp(sv) && SvLEN(sv)) && !SvIOKp(sv)) { if (!SvIOKp(sv) && ckWARN(WARN_NUMERIC) && !grok_number(SvPVX_const(sv), SvCUR(sv), NULL)) not_a_number(sv); return Atof(SvPVX_const(sv)); } if (SvIOKp(sv)) { if (SvIsUV(sv)) return (NV)SvUVX(sv); else return (NV)SvIVX(sv); } if (SvROK(sv)) { goto return_rok; } assert(SvTYPE(sv) >= SVt_PVMG); /* This falls through to the report_uninit near the end of the function. */ } else if (SvTHINKFIRST(sv)) { if (SvROK(sv)) { return_rok: if (SvAMAGIC(sv)) { SV *const tmpstr = AMG_CALLun(sv,numer); if (tmpstr && (!SvROK(tmpstr) || (SvRV(tmpstr) != SvRV(sv)))) { return SvNV(tmpstr); } } return PTR2NV(SvRV(sv)); } if (SvIsCOW(sv)) { sv_force_normal_flags(sv, 0); } if (SvREADONLY(sv) && !SvOK(sv)) { if (ckWARN(WARN_UNINITIALIZED)) report_uninit(sv); return 0.0; } } if (SvTYPE(sv) < SVt_NV) { /* The logic to use SVt_PVNV if necessary is in sv_upgrade. */ sv_upgrade(sv, SVt_NV); #ifdef USE_LONG_DOUBLE DEBUG_c({ STORE_NUMERIC_LOCAL_SET_STANDARD(); PerlIO_printf(Perl_debug_log, "0x%"UVxf" num(%" PERL_PRIgldbl ")\n", PTR2UV(sv), SvNVX(sv)); RESTORE_NUMERIC_LOCAL(); }); #else DEBUG_c({ STORE_NUMERIC_LOCAL_SET_STANDARD(); PerlIO_printf(Perl_debug_log, "0x%"UVxf" num(%"NVgf")\n", PTR2UV(sv), SvNVX(sv)); RESTORE_NUMERIC_LOCAL(); }); #endif } else if (SvTYPE(sv) < SVt_PVNV) sv_upgrade(sv, SVt_PVNV); if (SvNOKp(sv)) { return SvNVX(sv); } if (SvIOKp(sv)) { SvNV_set(sv, SvIsUV(sv) ? (NV)SvUVX(sv) : (NV)SvIVX(sv)); #ifdef NV_PRESERVES_UV SvNOK_on(sv); #else /* Only set the public NV OK flag if this NV preserves the IV */ /* Check it's not 0xFFFFFFFFFFFFFFFF */ if (SvIsUV(sv) ? ((SvUVX(sv) != UV_MAX)&&(SvUVX(sv) == U_V(SvNVX(sv)))) : (SvIVX(sv) == I_V(SvNVX(sv)))) SvNOK_on(sv); else SvNOKp_on(sv); #endif } else if (SvPOKp(sv) && SvLEN(sv)) { UV value; const int numtype = grok_number(SvPVX_const(sv), SvCUR(sv), &value); if (!SvIOKp(sv) && !numtype && ckWARN(WARN_NUMERIC)) not_a_number(sv); #ifdef NV_PRESERVES_UV if ((numtype & (IS_NUMBER_IN_UV | IS_NUMBER_NOT_INT)) == IS_NUMBER_IN_UV) { /* It's definitely an integer */ SvNV_set(sv, (numtype & IS_NUMBER_NEG) ? -(NV)value : (NV)value); } else SvNV_set(sv, Atof(SvPVX_const(sv))); SvNOK_on(sv); #else SvNV_set(sv, Atof(SvPVX_const(sv))); /* Only set the public NV OK flag if this NV preserves the value in the PV at least as well as an IV/UV would. Not sure how to do this 100% reliably. */ /* if that shift count is out of range then Configure's test is wonky. We shouldn't be in here with NV_PRESERVES_UV_BITS == UV_BITS */ if (((UV)1 << NV_PRESERVES_UV_BITS) > U_V(SvNVX(sv) > 0 ? SvNVX(sv) : -SvNVX(sv))) { SvNOK_on(sv); /* Definitely small enough to preserve all bits */ } else if (!(numtype & IS_NUMBER_IN_UV)) { /* Can't use strtol etc to convert this string, so don't try. sv_2iv and sv_2uv will use the NV to convert, not the PV. */ SvNOK_on(sv); } else { /* value has been set. It may not be precise. */ if ((numtype & IS_NUMBER_NEG) && (value > (UV)IV_MIN)) { /* 2s complement assumption for (UV)IV_MIN */ SvNOK_on(sv); /* Integer is too negative. */ } else { SvNOKp_on(sv); SvIOKp_on(sv); if (numtype & IS_NUMBER_NEG) { SvIV_set(sv, -(IV)value); } else if (value <= (UV)IV_MAX) { SvIV_set(sv, (IV)value); } else { SvUV_set(sv, value); SvIsUV_on(sv); } if (numtype & IS_NUMBER_NOT_INT) { /* I believe that even if the original PV had decimals, they are lost beyond the limit of the FP precision. However, neither is canonical, so both only get p flags. NWC, 2000/11/25 */ /* Both already have p flags, so do nothing */ } else { const NV nv = SvNVX(sv); if (SvNVX(sv) < (NV)IV_MAX + 0.5) { if (SvIVX(sv) == I_V(nv)) { SvNOK_on(sv); } else { /* It had no "." so it must be integer. */ } SvIOK_on(sv); } else { /* between IV_MAX and NV(UV_MAX). Could be slightly > UV_MAX */ if (numtype & IS_NUMBER_NOT_INT) { /* UV and NV both imprecise. */ } else { const UV nv_as_uv = U_V(nv); if (value == nv_as_uv && SvUVX(sv) != UV_MAX) { SvNOK_on(sv); } SvIOK_on(sv); } } } } } #endif /* NV_PRESERVES_UV */ } else { if (isGV_with_GP(sv)) { glob_2number((GV *)sv); return 0.0; } if (!PL_localizing && !(SvFLAGS(sv) & SVs_PADTMP) && ckWARN(WARN_UNINITIALIZED)) report_uninit(sv); assert (SvTYPE(sv) >= SVt_NV); /* Typically the caller expects that sv_any is not NULL now. */ /* XXX Ilya implies that this is a bug in callers that assume this and ideally should be fixed. */ return 0.0; } #if defined(USE_LONG_DOUBLE) DEBUG_c({ STORE_NUMERIC_LOCAL_SET_STANDARD(); PerlIO_printf(Perl_debug_log, "0x%"UVxf" 2nv(%" PERL_PRIgldbl ")\n", PTR2UV(sv), SvNVX(sv)); RESTORE_NUMERIC_LOCAL(); }); #else DEBUG_c({ STORE_NUMERIC_LOCAL_SET_STANDARD(); PerlIO_printf(Perl_debug_log, "0x%"UVxf" 1nv(%"NVgf")\n", PTR2UV(sv), SvNVX(sv)); RESTORE_NUMERIC_LOCAL(); }); #endif return SvNVX(sv); } /* uiv_2buf(): private routine for use by sv_2pv_flags(): print an IV or * UV as a string towards the end of buf, and return pointers to start and * end of it. * * We assume that buf is at least TYPE_CHARS(UV) long. */ static char * S_uiv_2buf(char *buf, IV iv, UV uv, int is_uv, char **peob) { char *ptr = buf + TYPE_CHARS(UV); char * const ebuf = ptr; int sign; if (is_uv) sign = 0; else if (iv >= 0) { uv = iv; sign = 0; } else { uv = -iv; sign = 1; } do { *--ptr = '0' + (char)(uv % 10); } while (uv /= 10); if (sign) *--ptr = '-'; *peob = ebuf; return ptr; } /* =for apidoc sv_2pv_flags Returns a pointer to the string value of an SV, and sets *lp to its length. If flags includes SV_GMAGIC, does an mg_get() first. Coerces sv to a string if necessary. Normally invoked via the C macro. C and C usually end up here too. =cut */ char * Perl_sv_2pv_flags(pTHX_ register SV *sv, STRLEN *lp, I32 flags) { dVAR; register char *s; if (!sv) { if (lp) *lp = 0; return (char *)""; } if (SvGMAGICAL(sv)) { if (flags & SV_GMAGIC) mg_get(sv); if (SvPOKp(sv)) { if (lp) *lp = SvCUR(sv); if (flags & SV_MUTABLE_RETURN) return SvPVX_mutable(sv); if (flags & SV_CONST_RETURN) return (char *)SvPVX_const(sv); return SvPVX(sv); } if (SvIOKp(sv) || SvNOKp(sv)) { char tbuf[64]; /* Must fit sprintf/Gconvert of longest IV/NV */ STRLEN len; if (SvIOKp(sv)) { len = SvIsUV(sv) ? my_snprintf(tbuf, sizeof(tbuf), "%"UVuf, (UV)SvUVX(sv)) : my_snprintf(tbuf, sizeof(tbuf), "%"IVdf, (IV)SvIVX(sv)); } else { Gconvert(SvNVX(sv), NV_DIG, 0, tbuf); len = strlen(tbuf); } assert(!SvROK(sv)); { dVAR; #ifdef FIXNEGATIVEZERO if (len == 2 && tbuf[0] == '-' && tbuf[1] == '0') { tbuf[0] = '0'; tbuf[1] = 0; len = 1; } #endif SvUPGRADE(sv, SVt_PV); if (lp) *lp = len; s = SvGROW_mutable(sv, len + 1); SvCUR_set(sv, len); SvPOKp_on(sv); return (char*)memcpy(s, tbuf, len + 1); } } if (SvROK(sv)) { goto return_rok; } assert(SvTYPE(sv) >= SVt_PVMG); /* This falls through to the report_uninit near the end of the function. */ } else if (SvTHINKFIRST(sv)) { if (SvROK(sv)) { return_rok: if (SvAMAGIC(sv)) { SV *const tmpstr = AMG_CALLun(sv,string); if (tmpstr && (!SvROK(tmpstr) || (SvRV(tmpstr) != SvRV(sv)))) { /* Unwrap this: */ /* char *pv = lp ? SvPV(tmpstr, *lp) : SvPV_nolen(tmpstr); */ char *pv; if ((SvFLAGS(tmpstr) & (SVf_POK)) == SVf_POK) { if (flags & SV_CONST_RETURN) { pv = (char *) SvPVX_const(tmpstr); } else { pv = (flags & SV_MUTABLE_RETURN) ? SvPVX_mutable(tmpstr) : SvPVX(tmpstr); } if (lp) *lp = SvCUR(tmpstr); } else { pv = sv_2pv_flags(tmpstr, lp, flags); } if (SvUTF8(tmpstr)) SvUTF8_on(sv); else SvUTF8_off(sv); return pv; } } { STRLEN len; char *retval; char *buffer; MAGIC *mg; const SV *const referent = (SV*)SvRV(sv); if (!referent) { len = 7; retval = buffer = savepvn("NULLREF", len); } else if (SvTYPE(referent) == SVt_PVMG && ((SvFLAGS(referent) & (SVs_OBJECT|SVf_OK|SVs_GMG|SVs_SMG|SVs_RMG)) == (SVs_OBJECT|SVs_SMG)) && (mg = mg_find(referent, PERL_MAGIC_qr))) { char *str = NULL; I32 haseval = 0; U32 flags = 0; (str) = CALLREG_AS_STR(mg,lp,&flags,&haseval); if (flags & 1) SvUTF8_on(sv); else SvUTF8_off(sv); PL_reginterp_cnt += haseval; return str; } else { const char *const typestr = sv_reftype(referent, 0); const STRLEN typelen = strlen(typestr); UV addr = PTR2UV(referent); const char *stashname = NULL; STRLEN stashnamelen = 0; /* hush, gcc */ const char *buffer_end; if (SvOBJECT(referent)) { const HEK *const name = HvNAME_HEK(SvSTASH(referent)); if (name) { stashname = HEK_KEY(name); stashnamelen = HEK_LEN(name); if (HEK_UTF8(name)) { SvUTF8_on(sv); } else { SvUTF8_off(sv); } } else { stashname = "__ANON__"; stashnamelen = 8; } len = stashnamelen + 1 /* = */ + typelen + 3 /* (0x */ + 2 * sizeof(UV) + 2 /* )\0 */; } else { len = typelen + 3 /* (0x */ + 2 * sizeof(UV) + 2 /* )\0 */; } Newx(buffer, len, char); buffer_end = retval = buffer + len; /* Working backwards */ *--retval = '\0'; *--retval = ')'; do { *--retval = PL_hexdigit[addr & 15]; } while (addr >>= 4); *--retval = 'x'; *--retval = '0'; *--retval = '('; retval -= typelen; memcpy(retval, typestr, typelen); if (stashname) { *--retval = '='; retval -= stashnamelen; memcpy(retval, stashname, stashnamelen); } /* retval may not neccesarily have reached the start of the buffer here. */ assert (retval >= buffer); len = buffer_end - retval - 1; /* -1 for that \0 */ } if (lp) *lp = len; SAVEFREEPV(buffer); return retval; } } if (SvREADONLY(sv) && !SvOK(sv)) { if (ckWARN(WARN_UNINITIALIZED)) report_uninit(sv); if (lp) *lp = 0; return (char *)""; } } if (SvIOK(sv) || ((SvIOKp(sv) && !SvNOKp(sv)))) { /* I'm assuming that if both IV and NV are equally valid then converting the IV is going to be more efficient */ const U32 isUIOK = SvIsUV(sv); char buf[TYPE_CHARS(UV)]; char *ebuf, *ptr; if (SvTYPE(sv) < SVt_PVIV) sv_upgrade(sv, SVt_PVIV); ptr = uiv_2buf(buf, SvIVX(sv), SvUVX(sv), isUIOK, &ebuf); /* inlined from sv_setpvn */ SvGROW_mutable(sv, (STRLEN)(ebuf - ptr + 1)); Move(ptr,SvPVX_mutable(sv),ebuf - ptr,char); SvCUR_set(sv, ebuf - ptr); s = SvEND(sv); *s = '\0'; } else if (SvNOKp(sv)) { const int olderrno = errno; if (SvTYPE(sv) < SVt_PVNV) sv_upgrade(sv, SVt_PVNV); /* The +20 is pure guesswork. Configure test needed. --jhi */ s = SvGROW_mutable(sv, NV_DIG + 20); /* some Xenix systems wipe out errno here */ #ifdef apollo if (SvNVX(sv) == 0.0) my_strlcpy(s, "0", SvLEN(sv)); else #endif /*apollo*/ { Gconvert(SvNVX(sv), NV_DIG, 0, s); } errno = olderrno; #ifdef FIXNEGATIVEZERO if (*s == '-' && s[1] == '0' && !s[2]) my_strlcpy(s, "0", SvLEN(s)); #endif while (*s) s++; #ifdef hcx if (s[-1] == '.') *--s = '\0'; #endif } else { if (isGV_with_GP(sv)) return glob_2pv((GV *)sv, lp); if (!PL_localizing && !(SvFLAGS(sv) & SVs_PADTMP) && ckWARN(WARN_UNINITIALIZED)) report_uninit(sv); if (lp) *lp = 0; if (SvTYPE(sv) < SVt_PV) /* Typically the caller expects that sv_any is not NULL now. */ sv_upgrade(sv, SVt_PV); return (char *)""; } { const STRLEN len = s - SvPVX_const(sv); if (lp) *lp = len; SvCUR_set(sv, len); } SvPOK_on(sv); DEBUG_c(PerlIO_printf(Perl_debug_log, "0x%"UVxf" 2pv(%s)\n", PTR2UV(sv),SvPVX_const(sv))); if (flags & SV_CONST_RETURN) return (char *)SvPVX_const(sv); if (flags & SV_MUTABLE_RETURN) return SvPVX_mutable(sv); return SvPVX(sv); } /* =for apidoc sv_copypv Copies a stringified representation of the source SV into the destination SV. Automatically performs any necessary mg_get and coercion of numeric values into strings. Guaranteed to preserve UTF-8 flag even from overloaded objects. Similar in nature to sv_2pv[_flags] but operates directly on an SV instead of just the string. Mostly uses sv_2pv_flags to do its work, except when that would lose the UTF-8'ness of the PV. =cut */ void Perl_sv_copypv(pTHX_ SV *dsv, register SV *ssv) { STRLEN len; const char * const s = SvPV_const(ssv,len); sv_setpvn(dsv,s,len); if (SvUTF8(ssv)) SvUTF8_on(dsv); else SvUTF8_off(dsv); } /* =for apidoc sv_2pvbyte Return a pointer to the byte-encoded representation of the SV, and set *lp to its length. May cause the SV to be downgraded from UTF-8 as a side-effect. Usually accessed via the C macro. =cut */ char * Perl_sv_2pvbyte(pTHX_ register SV *sv, STRLEN *lp) { sv_utf8_downgrade(sv,0); return lp ? SvPV(sv,*lp) : SvPV_nolen(sv); } /* =for apidoc sv_2pvutf8 Return a pointer to the UTF-8-encoded representation of the SV, and set *lp to its length. May cause the SV to be upgraded to UTF-8 as a side-effect. Usually accessed via the C macro. =cut */ char * Perl_sv_2pvutf8(pTHX_ register SV *sv, STRLEN *lp) { sv_utf8_upgrade(sv); return lp ? SvPV(sv,*lp) : SvPV_nolen(sv); } /* =for apidoc sv_2bool This function is only called on magical items, and is only used by sv_true() or its macro equivalent. =cut */ bool Perl_sv_2bool(pTHX_ register SV *sv) { dVAR; SvGETMAGIC(sv); if (!SvOK(sv)) return 0; if (SvROK(sv)) { if (SvAMAGIC(sv)) { SV * const tmpsv = AMG_CALLun(sv,bool_); if (tmpsv && (!SvROK(tmpsv) || (SvRV(tmpsv) != SvRV(sv)))) return (bool)SvTRUE(tmpsv); } return SvRV(sv) != 0; } if (SvPOKp(sv)) { register XPV* const Xpvtmp = (XPV*)SvANY(sv); if (Xpvtmp && (*sv->sv_u.svu_pv > '0' || Xpvtmp->xpv_cur > 1 || (Xpvtmp->xpv_cur && *sv->sv_u.svu_pv != '0'))) return 1; else return 0; } else { if (SvIOKp(sv)) return SvIVX(sv) != 0; else { if (SvNOKp(sv)) return SvNVX(sv) != 0.0; else { if (isGV_with_GP(sv)) return TRUE; else return FALSE; } } } } /* =for apidoc sv_utf8_upgrade Converts the PV of an SV to its UTF-8-encoded form. Forces the SV to string form if it is not already. Always sets the SvUTF8 flag to avoid future validity checks even if all the bytes have hibit clear. This is not as a general purpose byte encoding to Unicode interface: use the Encode extension for that. =for apidoc sv_utf8_upgrade_flags Converts the PV of an SV to its UTF-8-encoded form. Forces the SV to string form if it is not already. Always sets the SvUTF8 flag to avoid future validity checks even if all the bytes have hibit clear. If C has C bit set, will C on C if appropriate, else not. C and C are implemented in terms of this function. This is not as a general purpose byte encoding to Unicode interface: use the Encode extension for that. =cut */ STRLEN Perl_sv_utf8_upgrade_flags(pTHX_ register SV *sv, I32 flags) { dVAR; if (sv == &PL_sv_undef) return 0; if (!SvPOK(sv)) { STRLEN len = 0; if (SvREADONLY(sv) && (SvPOKp(sv) || SvIOKp(sv) || SvNOKp(sv))) { (void) sv_2pv_flags(sv,&len, flags); if (SvUTF8(sv)) return len; } else { (void) SvPV_force(sv,len); } } if (SvUTF8(sv)) { return SvCUR(sv); } if (SvIsCOW(sv)) { sv_force_normal_flags(sv, 0); } if (PL_encoding && !(flags & SV_UTF8_NO_ENCODING)) sv_recode_to_utf8(sv, PL_encoding); else { /* Assume Latin-1/EBCDIC */ /* This function could be much more efficient if we * had a FLAG in SVs to signal if there are any hibit * chars in the PV. Given that there isn't such a flag * make the loop as fast as possible. */ const U8 * const s = (U8 *) SvPVX_const(sv); const U8 * const e = (U8 *) SvEND(sv); const U8 *t = s; while (t < e) { const U8 ch = *t++; /* Check for hi bit */ if (!NATIVE_IS_INVARIANT(ch)) { STRLEN len = SvCUR(sv) + 1; /* Plus the \0 */ U8 * const recoded = bytes_to_utf8((U8*)s, &len); SvPV_free(sv); /* No longer using what was there before. */ SvPV_set(sv, (char*)recoded); SvCUR_set(sv, len - 1); SvLEN_set(sv, len); /* No longer know the real size. */ break; } } /* Mark as UTF-8 even if no hibit - saves scanning loop */ SvUTF8_on(sv); } return SvCUR(sv); } /* =for apidoc sv_utf8_downgrade Attempts to convert the PV of an SV from characters to bytes. If the PV contains a character beyond byte, this conversion will fail; in this case, either returns false or, if C is not true, croaks. This is not as a general purpose Unicode to byte encoding interface: use the Encode extension for that. =cut */ bool Perl_sv_utf8_downgrade(pTHX_ register SV* sv, bool fail_ok) { dVAR; if (SvPOKp(sv) && SvUTF8(sv)) { if (SvCUR(sv)) { U8 *s; STRLEN len; if (SvIsCOW(sv)) { sv_force_normal_flags(sv, 0); } s = (U8 *) SvPV(sv, len); if (!utf8_to_bytes(s, &len)) { if (fail_ok) return FALSE; else { if (PL_op) Perl_croak(aTHX_ "Wide character in %s", OP_DESC(PL_op)); else Perl_croak(aTHX_ "Wide character"); } } SvCUR_set(sv, len); } } SvUTF8_off(sv); return TRUE; } /* =for apidoc sv_utf8_encode Converts the PV of an SV to UTF-8, but then turns the C flag off so that it looks like octets again. =cut */ void Perl_sv_utf8_encode(pTHX_ register SV *sv) { if (SvIsCOW(sv)) { sv_force_normal_flags(sv, 0); } if (SvREADONLY(sv)) { Perl_croak(aTHX_ PL_no_modify); } (void) sv_utf8_upgrade(sv); SvUTF8_off(sv); } /* =for apidoc sv_utf8_decode If the PV of the SV is an octet sequence in UTF-8 and contains a multiple-byte character, the C flag is turned on so that it looks like a character. If the PV contains only single-byte characters, the C flag stays being off. Scans PV for validity and returns false if the PV is invalid UTF-8. =cut */ bool Perl_sv_utf8_decode(pTHX_ register SV *sv) { if (SvPOKp(sv)) { const U8 *c; const U8 *e; /* The octets may have got themselves encoded - get them back as * bytes */ if (!sv_utf8_downgrade(sv, TRUE)) return FALSE; /* it is actually just a matter of turning the utf8 flag on, but * we want to make sure everything inside is valid utf8 first. */ c = (const U8 *) SvPVX_const(sv); if (!is_utf8_string(c, SvCUR(sv)+1)) return FALSE; e = (const U8 *) SvEND(sv); while (c < e) { const U8 ch = *c++; if (!UTF8_IS_INVARIANT(ch)) { SvUTF8_on(sv); break; } } } return TRUE; } /* =for apidoc sv_setsv Copies the contents of the source SV C into the destination SV C. The source SV may be destroyed if it is mortal, so don't use this function if the source SV needs to be reused. Does not handle 'set' magic. Loosely speaking, it performs a copy-by-value, obliterating any previous content of the destination. You probably want to use one of the assortment of wrappers, such as C, C, C and C. =for apidoc sv_setsv_flags Copies the contents of the source SV C into the destination SV C. The source SV may be destroyed if it is mortal, so don't use this function if the source SV needs to be reused. Does not handle 'set' magic. Loosely speaking, it performs a copy-by-value, obliterating any previous content of the destination. If the C parameter has the C bit set, will C on C if appropriate, else not. If the C parameter has the C bit set then the buffers of temps will not be stolen. and C are implemented in terms of this function. You probably want to use one of the assortment of wrappers, such as C, C, C and C. This is the primary function for copying scalars, and most other copy-ish functions and macros use this underneath. =cut */ static void S_glob_assign_glob(pTHX_ SV *dstr, SV *sstr, const int dtype) { if (dtype != SVt_PVGV) { const char * const name = GvNAME(sstr); const STRLEN len = GvNAMELEN(sstr); /* don't upgrade SVt_PVLV: it can hold a glob */ if (dtype != SVt_PVLV) { if (dtype >= SVt_PV) { SvPV_free(dstr); SvPV_set(dstr, 0); SvLEN_set(dstr, 0); SvCUR_set(dstr, 0); } sv_upgrade(dstr, SVt_PVGV); (void)SvOK_off(dstr); /* FIXME - why are we doing this, then turning it off and on again below? */ isGV_with_GP_on(dstr); } GvSTASH(dstr) = GvSTASH(sstr); if (GvSTASH(dstr)) Perl_sv_add_backref(aTHX_ (SV*)GvSTASH(dstr), dstr); gv_name_set((GV *)dstr, name, len, GV_ADD); SvFAKE_on(dstr); /* can coerce to non-glob */ } #ifdef GV_UNIQUE_CHECK if (GvUNIQUE((GV*)dstr)) { Perl_croak(aTHX_ PL_no_modify); } #endif gp_free((GV*)dstr); isGV_with_GP_off(dstr); (void)SvOK_off(dstr); isGV_with_GP_on(dstr); GvINTRO_off(dstr); /* one-shot flag */ GvGP(dstr) = gp_ref(GvGP(sstr)); if (SvTAINTED(sstr)) SvTAINT(dstr); if (GvIMPORTED(dstr) != GVf_IMPORTED && CopSTASH_ne(PL_curcop, GvSTASH(dstr))) { GvIMPORTED_on(dstr); } GvMULTI_on(dstr); return; } static void S_glob_assign_ref(pTHX_ SV *dstr, SV *sstr) { SV * const sref = SvREFCNT_inc(SvRV(sstr)); SV *dref = NULL; const int intro = GvINTRO(dstr); SV **location; U8 import_flag = 0; const U32 stype = SvTYPE(sref); #ifdef GV_UNIQUE_CHECK if (GvUNIQUE((GV*)dstr)) { Perl_croak(aTHX_ PL_no_modify); } #endif if (intro) { GvINTRO_off(dstr); /* one-shot flag */ GvLINE(dstr) = CopLINE(PL_curcop); GvEGV(dstr) = (GV*)dstr; } GvMULTI_on(dstr); switch (stype) { case SVt_PVCV: location = (SV **) &GvCV(dstr); import_flag = GVf_IMPORTED_CV; goto common; case SVt_PVHV: location = (SV **) &GvHV(dstr); import_flag = GVf_IMPORTED_HV; goto common; case SVt_PVAV: location = (SV **) &GvAV(dstr); import_flag = GVf_IMPORTED_AV; goto common; case SVt_PVIO: location = (SV **) &GvIOp(dstr); goto common; case SVt_PVFM: location = (SV **) &GvFORM(dstr); default: location = &GvSV(dstr); import_flag = GVf_IMPORTED_SV; common: if (intro) { if (stype == SVt_PVCV) { if (GvCVGEN(dstr) && GvCV(dstr) != (CV*)sref) { SvREFCNT_dec(GvCV(dstr)); GvCV(dstr) = NULL; GvCVGEN(dstr) = 0; /* Switch off cacheness. */ PL_sub_generation++; } } SAVEGENERICSV(*location); } else dref = *location; if (stype == SVt_PVCV && *location != sref) { CV* const cv = (CV*)*location; if (cv) { if (!GvCVGEN((GV*)dstr) && (CvROOT(cv) || CvXSUB(cv))) { /* Redefining a sub - warning is mandatory if it was a const and its value changed. */ if (CvCONST(cv) && CvCONST((CV*)sref) && cv_const_sv(cv) == cv_const_sv((CV*)sref)) { NOOP; /* They are 2 constant subroutines generated from the same constant. This probably means that they are really the "same" proxy subroutine instantiated in 2 places. Most likely this is when a constant is exported twice. Don't warn. */ } else if (ckWARN(WARN_REDEFINE) || (CvCONST(cv) && (!CvCONST((CV*)sref) || sv_cmp(cv_const_sv(cv), cv_const_sv((CV*)sref))))) { Perl_warner(aTHX_ packWARN(WARN_REDEFINE), (const char *) (CvCONST(cv) ? "Constant subroutine %s::%s redefined" : "Subroutine %s::%s redefined"), HvNAME_get(GvSTASH((GV*)dstr)), GvENAME((GV*)dstr)); } } if (!intro) cv_ckproto_len(cv, (GV*)dstr, SvPOK(sref) ? SvPVX_const(sref) : NULL, SvPOK(sref) ? SvCUR(sref) : 0); } GvCVGEN(dstr) = 0; /* Switch off cacheness. */ GvASSUMECV_on(dstr); PL_sub_generation++; } *location = sref; if (import_flag && !(GvFLAGS(dstr) & import_flag) && CopSTASH_ne(PL_curcop, GvSTASH(dstr))) { GvFLAGS(dstr) |= import_flag; } break; } SvREFCNT_dec(dref); if (SvTAINTED(sstr)) SvTAINT(dstr); return; } void Perl_sv_setsv_flags(pTHX_ SV *dstr, register SV *sstr, I32 flags) { dVAR; register U32 sflags; register int dtype; register svtype stype; if (sstr == dstr) return; if (SvIS_FREED(dstr)) { Perl_croak(aTHX_ "panic: attempt to copy value %" SVf " to a freed scalar %p", sstr, dstr); } SV_CHECK_THINKFIRST_COW_DROP(dstr); if (!sstr) sstr = &PL_sv_undef; if (SvIS_FREED(sstr)) { Perl_croak(aTHX_ "panic: attempt to copy freed scalar %p to %p", sstr, dstr); } stype = SvTYPE(sstr); dtype = SvTYPE(dstr); SvAMAGIC_off(dstr); if ( SvVOK(dstr) ) { /* need to nuke the magic */ mg_free(dstr); SvRMAGICAL_off(dstr); } /* There's a lot of redundancy below but we're going for speed here */ switch (stype) { case SVt_NULL: undef_sstr: if (dtype != SVt_PVGV) { (void)SvOK_off(dstr); return; } break; case SVt_IV: if (SvIOK(sstr)) { switch (dtype) { case SVt_NULL: sv_upgrade(dstr, SVt_IV); break; case SVt_NV: case SVt_RV: case SVt_PV: sv_upgrade(dstr, SVt_PVIV); break; case SVt_PVGV: goto end_of_first_switch; } (void)SvIOK_only(dstr); SvIV_set(dstr, SvIVX(sstr)); if (SvIsUV(sstr)) SvIsUV_on(dstr); /* SvTAINTED can only be true if the SV has taint magic, which in turn means that the SV type is PVMG (or greater). This is the case statement for SVt_IV, so this cannot be true (whatever gcov may say). */ assert(!SvTAINTED(sstr)); return; } goto undef_sstr; case SVt_NV: if (SvNOK(sstr)) { switch (dtype) { case SVt_NULL: case SVt_IV: sv_upgrade(dstr, SVt_NV); break; case SVt_RV: case SVt_PV: case SVt_PVIV: sv_upgrade(dstr, SVt_PVNV); break; case SVt_PVGV: goto end_of_first_switch; } SvNV_set(dstr, SvNVX(sstr)); (void)SvNOK_only(dstr); /* SvTAINTED can only be true if the SV has taint magic, which in turn means that the SV type is PVMG (or greater). This is the case statement for SVt_NV, so this cannot be true (whatever gcov may say). */ assert(!SvTAINTED(sstr)); return; } goto undef_sstr; case SVt_RV: if (dtype < SVt_RV) sv_upgrade(dstr, SVt_RV); break; case SVt_PVFM: #ifdef PERL_OLD_COPY_ON_WRITE if ((SvFLAGS(sstr) & CAN_COW_MASK) == CAN_COW_FLAGS) { if (dtype < SVt_PVIV) sv_upgrade(dstr, SVt_PVIV); break; } /* Fall through */ #endif case SVt_PV: if (dtype < SVt_PV) sv_upgrade(dstr, SVt_PV); break; case SVt_PVIV: if (dtype < SVt_PVIV) sv_upgrade(dstr, SVt_PVIV); break; case SVt_PVNV: if (dtype < SVt_PVNV) sv_upgrade(dstr, SVt_PVNV); break; default: { const char * const type = sv_reftype(sstr,0); if (PL_op) Perl_croak(aTHX_ "Bizarre copy of %s in %s", type, OP_NAME(PL_op)); else Perl_croak(aTHX_ "Bizarre copy of %s", type); } break; /* case SVt_BIND: */ case SVt_PVGV: if (isGV_with_GP(sstr) && dtype <= SVt_PVGV) { glob_assign_glob(dstr, sstr, dtype); return; } /* SvVALID means that this PVGV is playing at being an FBM. */ /*FALLTHROUGH*/ case SVt_PVMG: case SVt_PVLV: if (SvGMAGICAL(sstr) && (flags & SV_GMAGIC)) { mg_get(sstr); if (SvTYPE(sstr) != stype) { stype = SvTYPE(sstr); if (isGV_with_GP(sstr) && stype == SVt_PVGV && dtype <= SVt_PVGV) { glob_assign_glob(dstr, sstr, dtype); return; } } } if (stype == SVt_PVLV) SvUPGRADE(dstr, SVt_PVNV); else SvUPGRADE(dstr, (svtype)stype); } end_of_first_switch: /* dstr may have been upgraded. */ dtype = SvTYPE(dstr); sflags = SvFLAGS(sstr); if (dtype == SVt_PVCV) { /* Assigning to a subroutine sets the prototype. */ if (SvOK(sstr)) { STRLEN len; const char *const ptr = SvPV_const(sstr, len); SvGROW(dstr, len + 1); Copy(ptr, SvPVX(dstr), len + 1, char); SvCUR_set(dstr, len); SvPOK_only(dstr); } else { SvOK_off(dstr); } } else if (sflags & SVf_ROK) { if (isGV_with_GP(dstr) && dtype == SVt_PVGV && SvTYPE(SvRV(sstr)) == SVt_PVGV) { sstr = SvRV(sstr); if (sstr == dstr) { if (GvIMPORTED(dstr) != GVf_IMPORTED && CopSTASH_ne(PL_curcop, GvSTASH(dstr))) { GvIMPORTED_on(dstr); } GvMULTI_on(dstr); return; } glob_assign_glob(dstr, sstr, dtype); return; } if (dtype >= SVt_PV) { if (dtype == SVt_PVGV) { glob_assign_ref(dstr, sstr); return; } if (SvPVX_const(dstr)) { SvPV_free(dstr); SvLEN_set(dstr, 0); SvCUR_set(dstr, 0); } } (void)SvOK_off(dstr); SvRV_set(dstr, SvREFCNT_inc(SvRV(sstr))); SvFLAGS(dstr) |= sflags & SVf_ROK; assert(!(sflags & SVp_NOK)); assert(!(sflags & SVp_IOK)); assert(!(sflags & SVf_NOK)); assert(!(sflags & SVf_IOK)); } else if (dtype == SVt_PVGV && isGV_with_GP(dstr)) { if (!(sflags & SVf_OK)) { if (ckWARN(WARN_MISC)) Perl_warner(aTHX_ packWARN(WARN_MISC), "Undefined value assigned to typeglob"); } else { GV *gv = gv_fetchsv(sstr, GV_ADD, SVt_PVGV); if (dstr != (SV*)gv) { if (GvGP(dstr)) gp_free((GV*)dstr); GvGP(dstr) = gp_ref(GvGP(gv)); } } } else if (sflags & SVp_POK) { bool isSwipe = 0; /* * Check to see if we can just swipe the string. If so, it's a * possible small lose on short strings, but a big win on long ones. * It might even be a win on short strings if SvPVX_const(dstr) * has to be allocated and SvPVX_const(sstr) has to be freed. * Likewise if we can set up COW rather than doing an actual copy, we * drop to the else clause, as the swipe code and the COW setup code * have much in common. */ /* Whichever path we take through the next code, we want this true, and doing it now facilitates the COW check. */ (void)SvPOK_only(dstr); if ( /* If we're already COW then this clause is not true, and if COW is allowed then we drop down to the else and make dest COW with us. If caller hasn't said that we're allowed to COW shared hash keys then we don't do the COW setup, even if the source scalar is a shared hash key scalar. */ (((flags & SV_COW_SHARED_HASH_KEYS) ? (sflags & (SVf_FAKE|SVf_READONLY)) != (SVf_FAKE|SVf_READONLY) : 1 /* If making a COW copy is forbidden then the behaviour we desire is as if the source SV isn't actually already COW, even if it is. So we act as if the source flags are not COW, rather than actually testing them. */ ) #ifndef PERL_OLD_COPY_ON_WRITE /* The change that added SV_COW_SHARED_HASH_KEYS makes the logic when PERL_OLD_COPY_ON_WRITE is defined a little wrong. Conceptually PERL_OLD_COPY_ON_WRITE being defined should override SV_COW_SHARED_HASH_KEYS, because it means "always COW" but in turn, it's somewhat dead code, never expected to go live, but more kept as a placeholder on how to do it better in a newer implementation. */ /* If we are COW and dstr is a suitable target then we drop down into the else and make dest a COW of us. */ || (SvFLAGS(dstr) & CAN_COW_MASK) != CAN_COW_FLAGS #endif ) && !(isSwipe = (sflags & SVs_TEMP) && /* slated for free anyway? */ !(sflags & SVf_OOK) && /* and not involved in OOK hack? */ (!(flags & SV_NOSTEAL)) && /* and we're allowed to steal temps */ SvREFCNT(sstr) == 1 && /* and no other references to it? */ SvLEN(sstr) && /* and really is a string */ /* and won't be needed again, potentially */ !(PL_op && PL_op->op_type == OP_AASSIGN)) #ifdef PERL_OLD_COPY_ON_WRITE && !((sflags & CAN_COW_MASK) == CAN_COW_FLAGS && (SvFLAGS(dstr) & CAN_COW_MASK) == CAN_COW_FLAGS && SvTYPE(sstr) >= SVt_PVIV) #endif ) { /* Failed the swipe test, and it's not a shared hash key either. Have to copy the string. */ STRLEN len = SvCUR(sstr); SvGROW(dstr, len + 1); /* inlined from sv_setpvn */ Move(SvPVX_const(sstr),SvPVX(dstr),len,char); SvCUR_set(dstr, len); *SvEND(dstr) = '\0'; } else { /* If PERL_OLD_COPY_ON_WRITE is not defined, then isSwipe will always be true in here. */ /* Either it's a shared hash key, or it's suitable for copy-on-write or we can swipe the string. */ if (DEBUG_C_TEST) { PerlIO_printf(Perl_debug_log, "Copy on write: sstr --> dstr\n"); sv_dump(sstr); sv_dump(dstr); } #ifdef PERL_OLD_COPY_ON_WRITE if (!isSwipe) { /* I believe I should acquire a global SV mutex if it's a COW sv (not a shared hash key) to stop it going un copy-on-write. If the source SV has gone un copy on write between up there and down here, then (assert() that) it is of the correct form to make it copy on write again */ if ((sflags & (SVf_FAKE | SVf_READONLY)) != (SVf_FAKE | SVf_READONLY)) { SvREADONLY_on(sstr); SvFAKE_on(sstr); /* Make the source SV into a loop of 1. (about to become 2) */ SV_COW_NEXT_SV_SET(sstr, sstr); } } #endif /* Initial code is common. */ if (SvPVX_const(dstr)) { /* we know that dtype >= SVt_PV */ SvPV_free(dstr); } if (!isSwipe) { /* making another shared SV. */ STRLEN cur = SvCUR(sstr); STRLEN len = SvLEN(sstr); #ifdef PERL_OLD_COPY_ON_WRITE if (len) { assert (SvTYPE(dstr) >= SVt_PVIV); /* SvIsCOW_normal */ /* splice us in between source and next-after-source. */ SV_COW_NEXT_SV_SET(dstr, SV_COW_NEXT_SV(sstr)); SV_COW_NEXT_SV_SET(sstr, dstr); SvPV_set(dstr, SvPVX_mutable(sstr)); } else #endif { /* SvIsCOW_shared_hash */ DEBUG_C(PerlIO_printf(Perl_debug_log, "Copy on write: Sharing hash\n")); assert (SvTYPE(dstr) >= SVt_PV); SvPV_set(dstr, HEK_KEY(share_hek_hek(SvSHARED_HEK_FROM_PV(SvPVX_const(sstr))))); } SvLEN_set(dstr, len); SvCUR_set(dstr, cur); SvREADONLY_on(dstr); SvFAKE_on(dstr); /* Relesase a global SV mutex. */ } else { /* Passes the swipe test. */ SvPV_set(dstr, SvPVX_mutable(sstr)); SvLEN_set(dstr, SvLEN(sstr)); SvCUR_set(dstr, SvCUR(sstr)); SvTEMP_off(dstr); (void)SvOK_off(sstr); /* NOTE: nukes most SvFLAGS on sstr */ SvPV_set(sstr, NULL); SvLEN_set(sstr, 0); SvCUR_set(sstr, 0); SvTEMP_off(sstr); } } if (sflags & SVp_NOK) { SvNV_set(dstr, SvNVX(sstr)); } if (sflags & SVp_IOK) { SvRELEASE_IVX(dstr); SvIV_set(dstr, SvIVX(sstr)); /* Must do this otherwise some other overloaded use of 0x80000000 gets confused. I guess SVpbm_VALID */ if (sflags & SVf_IVisUV) SvIsUV_on(dstr); } SvFLAGS(dstr) |= sflags & (SVf_IOK|SVp_IOK|SVf_NOK|SVp_NOK|SVf_UTF8); { const MAGIC * const smg = SvVSTRING_mg(sstr); if (smg) { sv_magic(dstr, NULL, PERL_MAGIC_vstring, smg->mg_ptr, smg->mg_len); SvRMAGICAL_on(dstr); } } } else if (sflags & (SVp_IOK|SVp_NOK)) { (void)SvOK_off(dstr); SvFLAGS(dstr) |= sflags & (SVf_IOK|SVp_IOK|SVf_IVisUV|SVf_NOK|SVp_NOK); if (sflags & SVp_IOK) { /* XXXX Do we want to set IsUV for IV(ROK)? Be extra safe... */ SvIV_set(dstr, SvIVX(sstr)); } if (sflags & SVp_NOK) { SvNV_set(dstr, SvNVX(sstr)); } } else { if (isGV_with_GP(sstr)) { /* This stringification rule for globs is spread in 3 places. This feels bad. FIXME. */ const U32 wasfake = sflags & SVf_FAKE; /* FAKE globs can get coerced, so need to turn this off temporarily if it is on. */ SvFAKE_off(sstr); gv_efullname3(dstr, (GV *)sstr, "*"); SvFLAGS(sstr) |= wasfake; } else (void)SvOK_off(dstr); } if (SvTAINTED(sstr)) SvTAINT(dstr); } /* =for apidoc sv_setsv_mg Like C, but also handles 'set' magic. =cut */ void Perl_sv_setsv_mg(pTHX_ SV *dstr, register SV *sstr) { sv_setsv(dstr,sstr); SvSETMAGIC(dstr); } #ifdef PERL_OLD_COPY_ON_WRITE SV * Perl_sv_setsv_cow(pTHX_ SV *dstr, SV *sstr) { STRLEN cur = SvCUR(sstr); STRLEN len = SvLEN(sstr); register char *new_pv; if (DEBUG_C_TEST) { PerlIO_printf(Perl_debug_log, "Fast copy on write: %p -> %p\n", sstr, dstr); sv_dump(sstr); if (dstr) sv_dump(dstr); } if (dstr) { if (SvTHINKFIRST(dstr)) sv_force_normal_flags(dstr, SV_COW_DROP_PV); else if (SvPVX_const(dstr)) Safefree(SvPVX_const(dstr)); } else new_SV(dstr); SvUPGRADE(dstr, SVt_PVIV); assert (SvPOK(sstr)); assert (SvPOKp(sstr)); assert (!SvIOK(sstr)); assert (!SvIOKp(sstr)); assert (!SvNOK(sstr)); assert (!SvNOKp(sstr)); if (SvIsCOW(sstr)) { if (SvLEN(sstr) == 0) { /* source is a COW shared hash key. */ DEBUG_C(PerlIO_printf(Perl_debug_log, "Fast copy on write: Sharing hash\n")); new_pv = HEK_KEY(share_hek_hek(SvSHARED_HEK_FROM_PV(SvPVX_const(sstr)))); goto common_exit; } SV_COW_NEXT_SV_SET(dstr, SV_COW_NEXT_SV(sstr)); } else { assert ((SvFLAGS(sstr) & CAN_COW_MASK) == CAN_COW_FLAGS); SvUPGRADE(sstr, SVt_PVIV); SvREADONLY_on(sstr); SvFAKE_on(sstr); DEBUG_C(PerlIO_printf(Perl_debug_log, "Fast copy on write: Converting sstr to COW\n")); SV_COW_NEXT_SV_SET(dstr, sstr); } SV_COW_NEXT_SV_SET(sstr, dstr); new_pv = SvPVX_mutable(sstr); common_exit: SvPV_set(dstr, new_pv); SvFLAGS(dstr) = (SVt_PVIV|SVf_POK|SVp_POK|SVf_FAKE|SVf_READONLY); if (SvUTF8(sstr)) SvUTF8_on(dstr); SvLEN_set(dstr, len); SvCUR_set(dstr, cur); if (DEBUG_C_TEST) { sv_dump(dstr); } return dstr; } #endif /* =for apidoc sv_setpvn Copies a string into an SV. The C parameter indicates the number of bytes to be copied. If the C argument is NULL the SV will become undefined. Does not handle 'set' magic. See C. =cut */ void Perl_sv_setpvn(pTHX_ register SV *sv, register const char *ptr, register STRLEN len) { dVAR; register char *dptr; SV_CHECK_THINKFIRST_COW_DROP(sv); if (!ptr) { (void)SvOK_off(sv); return; } else { /* len is STRLEN which is unsigned, need to copy to signed */ const IV iv = len; if (iv < 0) Perl_croak(aTHX_ "panic: sv_setpvn called with negative strlen"); } SvUPGRADE(sv, SVt_PV); dptr = SvGROW(sv, len + 1); Move(ptr,dptr,len,char); dptr[len] = '\0'; SvCUR_set(sv, len); (void)SvPOK_only_UTF8(sv); /* validate pointer */ SvTAINT(sv); } /* =for apidoc sv_setpvn_mg Like C, but also handles 'set' magic. =cut */ void Perl_sv_setpvn_mg(pTHX_ register SV *sv, register const char *ptr, register STRLEN len) { sv_setpvn(sv,ptr,len); SvSETMAGIC(sv); } /* =for apidoc sv_setpv Copies a string into an SV. The string must be null-terminated. Does not handle 'set' magic. See C. =cut */ void Perl_sv_setpv(pTHX_ register SV *sv, register const char *ptr) { dVAR; register STRLEN len; SV_CHECK_THINKFIRST_COW_DROP(sv); if (!ptr) { (void)SvOK_off(sv); return; } len = strlen(ptr); SvUPGRADE(sv, SVt_PV); SvGROW(sv, len + 1); Move(ptr,SvPVX(sv),len+1,char); SvCUR_set(sv, len); (void)SvPOK_only_UTF8(sv); /* validate pointer */ SvTAINT(sv); } /* =for apidoc sv_setpv_mg Like C, but also handles 'set' magic. =cut */ void Perl_sv_setpv_mg(pTHX_ register SV *sv, register const char *ptr) { sv_setpv(sv,ptr); SvSETMAGIC(sv); } /* =for apidoc sv_usepvn_flags Tells an SV to use C to find its string value. Normally the string is stored inside the SV but sv_usepvn allows the SV to use an outside string. The C should point to memory that was allocated by C. The string length, C, must be supplied. By default this function will realloc (i.e. move) the memory pointed to by C, so that pointer should not be freed or used by the programmer after giving it to sv_usepvn, and neither should any pointers from "behind" that pointer (e.g. ptr + 1) be used. If C & SV_SMAGIC is true, will call SvSETMAGIC. If C & SV_HAS_TRAILING_NUL is true, then C must be NUL, and the realloc will be skipped. (i.e. the buffer is actually at least 1 byte longer than C, and already meets the requirements for storing in C) =cut */ void Perl_sv_usepvn_flags(pTHX_ SV *sv, char *ptr, STRLEN len, U32 flags) { dVAR; STRLEN allocate; SV_CHECK_THINKFIRST_COW_DROP(sv); SvUPGRADE(sv, SVt_PV); if (!ptr) { (void)SvOK_off(sv); if (flags & SV_SMAGIC) SvSETMAGIC(sv); return; } if (SvPVX_const(sv)) SvPV_free(sv); #ifdef DEBUGGING if (flags & SV_HAS_TRAILING_NUL) assert(ptr[len] == '\0'); #endif allocate = (flags & SV_HAS_TRAILING_NUL) ? len + 1: PERL_STRLEN_ROUNDUP(len + 1); if (flags & SV_HAS_TRAILING_NUL) { /* It's long enough - do nothing. Specfically Perl_newCONSTSUB is relying on this. */ } else { #ifdef DEBUGGING /* Force a move to shake out bugs in callers. */ char *new_ptr = (char*)safemalloc(allocate); Copy(ptr, new_ptr, len, char); PoisonFree(ptr,len,char); Safefree(ptr); ptr = new_ptr; #else ptr = (char*) saferealloc (ptr, allocate); #endif } SvPV_set(sv, ptr); SvCUR_set(sv, len); SvLEN_set(sv, allocate); if (!(flags & SV_HAS_TRAILING_NUL)) { *SvEND(sv) = '\0'; } (void)SvPOK_only_UTF8(sv); /* validate pointer */ SvTAINT(sv); if (flags & SV_SMAGIC) SvSETMAGIC(sv); } #ifdef PERL_OLD_COPY_ON_WRITE /* Need to do this *after* making the SV normal, as we need the buffer pointer to remain valid until after we've copied it. If we let go too early, another thread could invalidate it by unsharing last of the same hash key (which it can do by means other than releasing copy-on-write Svs) or by changing the other copy-on-write SVs in the loop. */ STATIC void S_sv_release_COW(pTHX_ register SV *sv, const char *pvx, STRLEN len, SV *after) { if (len) { /* this SV was SvIsCOW_normal(sv) */ /* we need to find the SV pointing to us. */ SV *current = SV_COW_NEXT_SV(after); if (current == sv) { /* The SV we point to points back to us (there were only two of us in the loop.) Hence other SV is no longer copy on write either. */ SvFAKE_off(after); SvREADONLY_off(after); } else { /* We need to follow the pointers around the loop. */ SV *next; while ((next = SV_COW_NEXT_SV(current)) != sv) { assert (next); current = next; /* don't loop forever if the structure is bust, and we have a pointer into a closed loop. */ assert (current != after); assert (SvPVX_const(current) == pvx); } /* Make the SV before us point to the SV after us. */ SV_COW_NEXT_SV_SET(current, after); } } else { unshare_hek(SvSHARED_HEK_FROM_PV(pvx)); } } int Perl_sv_release_IVX(pTHX_ register SV *sv) { if (SvIsCOW(sv)) sv_force_normal_flags(sv, 0); SvOOK_off(sv); return 0; } #endif /* =for apidoc sv_force_normal_flags Undo various types of fakery on an SV: if the PV is a shared string, make a private copy; if we're a ref, stop refing; if we're a glob, downgrade to an xpvmg; if we're a copy-on-write scalar, this is the on-write time when we do the copy, and is also used locally. If C is set then a copy-on-write scalar drops its PV buffer (if any) and becomes SvPOK_off rather than making a copy. (Used where this scalar is about to be set to some other value.) In addition, the C parameter gets passed to C when unrefing. C calls this function with flags set to 0. =cut */ void Perl_sv_force_normal_flags(pTHX_ register SV *sv, U32 flags) { dVAR; #ifdef PERL_OLD_COPY_ON_WRITE if (SvREADONLY(sv)) { /* At this point I believe I should acquire a global SV mutex. */ if (SvFAKE(sv)) { const char * const pvx = SvPVX_const(sv); const STRLEN len = SvLEN(sv); const STRLEN cur = SvCUR(sv); SV * const next = SV_COW_NEXT_SV(sv); /* next COW sv in the loop. */ if (DEBUG_C_TEST) { PerlIO_printf(Perl_debug_log, "Copy on write: Force normal %ld\n", (long) flags); sv_dump(sv); } SvFAKE_off(sv); SvREADONLY_off(sv); /* This SV doesn't own the buffer, so need to Newx() a new one: */ SvPV_set(sv, NULL); SvLEN_set(sv, 0); if (flags & SV_COW_DROP_PV) { /* OK, so we don't need to copy our buffer. */ SvPOK_off(sv); } else { SvGROW(sv, cur + 1); Move(pvx,SvPVX(sv),cur,char); SvCUR_set(sv, cur); *SvEND(sv) = '\0'; } sv_release_COW(sv, pvx, len, next); if (DEBUG_C_TEST) { sv_dump(sv); } } else if (IN_PERL_RUNTIME) Perl_croak(aTHX_ PL_no_modify); /* At this point I believe that I can drop the global SV mutex. */ } #else if (SvREADONLY(sv)) { if (SvFAKE(sv)) { const char * const pvx = SvPVX_const(sv); const STRLEN len = SvCUR(sv); SvFAKE_off(sv); SvREADONLY_off(sv); SvPV_set(sv, NULL); SvLEN_set(sv, 0); SvGROW(sv, len + 1); Move(pvx,SvPVX(sv),len,char); *SvEND(sv) = '\0'; unshare_hek(SvSHARED_HEK_FROM_PV(pvx)); } else if (IN_PERL_RUNTIME) Perl_croak(aTHX_ PL_no_modify); } #endif if (SvROK(sv)) sv_unref_flags(sv, flags); else if (SvFAKE(sv) && SvTYPE(sv) == SVt_PVGV) sv_unglob(sv); } /* =for apidoc sv_chop Efficient removal of characters from the beginning of the string buffer. SvPOK(sv) must be true and the C must be a pointer to somewhere inside the string buffer. The C becomes the first character of the adjusted string. Uses the "OOK hack". Beware: after this function returns, C and SvPVX_const(sv) may no longer refer to the same chunk of data. =cut */ void Perl_sv_chop(pTHX_ register SV *sv, register const char *ptr) { register STRLEN delta; if (!ptr || !SvPOKp(sv)) return; delta = ptr - SvPVX_const(sv); SV_CHECK_THINKFIRST(sv); if (SvTYPE(sv) < SVt_PVIV) sv_upgrade(sv,SVt_PVIV); if (!SvOOK(sv)) { if (!SvLEN(sv)) { /* make copy of shared string */ const char *pvx = SvPVX_const(sv); const STRLEN len = SvCUR(sv); SvGROW(sv, len + 1); Move(pvx,SvPVX(sv),len,char); *SvEND(sv) = '\0'; } SvIV_set(sv, 0); /* Same SvOOK_on but SvOOK_on does a SvIOK_off and we do that anyway inside the SvNIOK_off */ SvFLAGS(sv) |= SVf_OOK; } SvNIOK_off(sv); SvLEN_set(sv, SvLEN(sv) - delta); SvCUR_set(sv, SvCUR(sv) - delta); SvPV_set(sv, SvPVX(sv) + delta); SvIV_set(sv, SvIVX(sv) + delta); } /* =for apidoc sv_catpvn Concatenates the string onto the end of the string which is in the SV. The C indicates number of bytes to copy. If the SV has the UTF-8 status set, then the bytes appended should be valid UTF-8. Handles 'get' magic, but not 'set' magic. See C. =for apidoc sv_catpvn_flags Concatenates the string onto the end of the string which is in the SV. The C indicates number of bytes to copy. If the SV has the UTF-8 status set, then the bytes appended should be valid UTF-8. If C has C bit set, will C on C if appropriate, else not. C and C are implemented in terms of this function. =cut */ void Perl_sv_catpvn_flags(pTHX_ register SV *dsv, register const char *sstr, register STRLEN slen, I32 flags) { dVAR; STRLEN dlen; const char * const dstr = SvPV_force_flags(dsv, dlen, flags); SvGROW(dsv, dlen + slen + 1); if (sstr == dstr) sstr = SvPVX_const(dsv); Move(sstr, SvPVX(dsv) + dlen, slen, char); SvCUR_set(dsv, SvCUR(dsv) + slen); *SvEND(dsv) = '\0'; (void)SvPOK_only_UTF8(dsv); /* validate pointer */ SvTAINT(dsv); if (flags & SV_SMAGIC) SvSETMAGIC(dsv); } /* =for apidoc sv_catsv Concatenates the string from SV C onto the end of the string in SV C. Modifies C but not C. Handles 'get' magic, but not 'set' magic. See C. =for apidoc sv_catsv_flags Concatenates the string from SV C onto the end of the string in SV C. Modifies C but not C. If C has C bit set, will C on the SVs if appropriate, else not. C and C are implemented in terms of this function. =cut */ void Perl_sv_catsv_flags(pTHX_ SV *dsv, register SV *ssv, I32 flags) { dVAR; if (ssv) { STRLEN slen; const char *spv = SvPV_const(ssv, slen); if (spv) { /* sutf8 and dutf8 were type bool, but under USE_ITHREADS, gcc version 2.95.2 20000220 (Debian GNU/Linux) for Linux xxx 2.2.17 on sparc64 with gcc -O2, we erroneously get dutf8 = 0x20000000, (i.e. SVf_UTF8) even though dsv->sv_flags doesn't have that bit set. Andy Dougherty 12 Oct 2001 */ const I32 sutf8 = DO_UTF8(ssv); I32 dutf8; if (SvGMAGICAL(dsv) && (flags & SV_GMAGIC)) mg_get(dsv); dutf8 = DO_UTF8(dsv); if (dutf8 != sutf8) { if (dutf8) { /* Not modifying source SV, so taking a temporary copy. */ SV* const csv = sv_2mortal(newSVpvn(spv, slen)); sv_utf8_upgrade(csv); spv = SvPV_const(csv, slen); } else sv_utf8_upgrade_nomg(dsv); } sv_catpvn_nomg(dsv, spv, slen); } } if (flags & SV_SMAGIC) SvSETMAGIC(dsv); } /* =for apidoc sv_catpv Concatenates the string onto the end of the string which is in the SV. If the SV has the UTF-8 status set, then the bytes appended should be valid UTF-8. Handles 'get' magic, but not 'set' magic. See C. =cut */ void Perl_sv_catpv(pTHX_ register SV *sv, register const char *ptr) { dVAR; register STRLEN len; STRLEN tlen; char *junk; if (!ptr) return; junk = SvPV_force(sv, tlen); len = strlen(ptr); SvGROW(sv, tlen + len + 1); if (ptr == junk) ptr = SvPVX_const(sv); Move(ptr,SvPVX(sv)+tlen,len+1,char); SvCUR_set(sv, SvCUR(sv) + len); (void)SvPOK_only_UTF8(sv); /* validate pointer */ SvTAINT(sv); } /* =for apidoc sv_catpv_mg Like C, but also handles 'set' magic. =cut */ void Perl_sv_catpv_mg(pTHX_ register SV *sv, register const char *ptr) { sv_catpv(sv,ptr); SvSETMAGIC(sv); } /* =for apidoc newSV Creates a new SV. A non-zero C parameter indicates the number of bytes of preallocated string space the SV should have. An extra byte for a trailing NUL is also reserved. (SvPOK is not set for the SV even if string space is allocated.) The reference count for the new SV is set to 1. In 5.9.3, newSV() replaces the older NEWSV() API, and drops the first parameter, I, a debug aid which allowed callers to identify themselves. This aid has been superseded by a new build option, PERL_MEM_LOG (see L). The older API is still there for use in XS modules supporting older perls. =cut */ SV * Perl_newSV(pTHX_ STRLEN len) { dVAR; register SV *sv; new_SV(sv); if (len) { sv_upgrade(sv, SVt_PV); SvGROW(sv, len + 1); } return sv; } /* =for apidoc sv_magicext Adds magic to an SV, upgrading it if necessary. Applies the supplied vtable and returns a pointer to the magic added. Note that C will allow things that C will not. In particular, you can add magic to SvREADONLY SVs, and add more than one instance of the same 'how'. If C is greater than zero then a C I of C is stored, if C is zero then C is stored as-is and - as another special case - if C<(name && namlen == HEf_SVKEY)> then C is assumed to contain an C and is stored as-is with its REFCNT incremented. (This is now used as a subroutine by C.) =cut */ MAGIC * Perl_sv_magicext(pTHX_ SV* sv, SV* obj, int how, const MGVTBL *vtable, const char* name, I32 namlen) { dVAR; MAGIC* mg; if (SvTYPE(sv) < SVt_PVMG) { SvUPGRADE(sv, SVt_PVMG); } Newxz(mg, 1, MAGIC); mg->mg_moremagic = SvMAGIC(sv); SvMAGIC_set(sv, mg); /* Sometimes a magic contains a reference loop, where the sv and object refer to each other. To prevent a reference loop that would prevent such objects being freed, we look for such loops and if we find one we avoid incrementing the object refcount. Note we cannot do this to avoid self-tie loops as intervening RV must have its REFCNT incremented to keep it in existence. */ if (!obj || obj == sv || how == PERL_MAGIC_arylen || how == PERL_MAGIC_qr || how == PERL_MAGIC_symtab || (SvTYPE(obj) == SVt_PVGV && (GvSV(obj) == sv || GvHV(obj) == (HV*)sv || GvAV(obj) == (AV*)sv || GvCV(obj) == (CV*)sv || GvIOp(obj) == (IO*)sv || GvFORM(obj) == (CV*)sv))) { mg->mg_obj = obj; } else { mg->mg_obj = SvREFCNT_inc_simple(obj); mg->mg_flags |= MGf_REFCOUNTED; } /* Normal self-ties simply pass a null object, and instead of using mg_obj directly, use the SvTIED_obj macro to produce a new RV as needed. For glob "self-ties", we are tieing the PVIO with an RV obj pointing to the glob containing the PVIO. In this case, to avoid a reference loop, we need to weaken the reference. */ if (how == PERL_MAGIC_tiedscalar && SvTYPE(sv) == SVt_PVIO && obj && SvROK(obj) && GvIO(SvRV(obj)) == (IO*)sv) { sv_rvweaken(obj); } mg->mg_type = how; mg->mg_len = namlen; if (name) { if (namlen > 0) mg->mg_ptr = savepvn(name, namlen); else if (namlen == HEf_SVKEY) mg->mg_ptr = (char*)SvREFCNT_inc_simple_NN((SV*)name); else mg->mg_ptr = (char *) name; } mg->mg_virtual = (MGVTBL *) vtable; mg_magical(sv); if (SvGMAGICAL(sv)) SvFLAGS(sv) &= ~(SVf_IOK|SVf_NOK|SVf_POK); return mg; } /* =for apidoc sv_magic Adds magic to an SV. First upgrades C to type C if necessary, then adds a new magic item of type C to the head of the magic list. See C (which C now calls) for a description of the handling of the C and C arguments. You need to use C to add magic to SvREADONLY SVs and also to add more than one instance of the same 'how'. =cut */ void Perl_sv_magic(pTHX_ register SV *sv, SV *obj, int how, const char *name, I32 namlen) { dVAR; const MGVTBL *vtable; MAGIC* mg; #ifdef PERL_OLD_COPY_ON_WRITE if (SvIsCOW(sv)) sv_force_normal_flags(sv, 0); #endif if (SvREADONLY(sv)) { if ( /* its okay to attach magic to shared strings; the subsequent * upgrade to PVMG will unshare the string */ !(SvFAKE(sv) && SvTYPE(sv) < SVt_PVMG) && IN_PERL_RUNTIME && how != PERL_MAGIC_regex_global && how != PERL_MAGIC_bm && how != PERL_MAGIC_fm && how != PERL_MAGIC_sv && how != PERL_MAGIC_backref ) { Perl_croak(aTHX_ PL_no_modify); } } if (SvMAGICAL(sv) || (how == PERL_MAGIC_taint && SvTYPE(sv) >= SVt_PVMG)) { if (SvMAGIC(sv) && (mg = mg_find(sv, how))) { /* sv_magic() refuses to add a magic of the same 'how' as an existing one */ if (how == PERL_MAGIC_taint) { mg->mg_len |= 1; /* Any scalar which already had taint magic on which someone (erroneously?) did SvIOK_on() or similar will now be incorrectly sporting public "OK" flags. */ SvFLAGS(sv) &= ~(SVf_IOK|SVf_NOK|SVf_POK); } return; } } switch (how) { case PERL_MAGIC_sv: vtable = &PL_vtbl_sv; break; case PERL_MAGIC_overload: vtable = &PL_vtbl_amagic; break; case PERL_MAGIC_overload_elem: vtable = &PL_vtbl_amagicelem; break; case PERL_MAGIC_overload_table: vtable = &PL_vtbl_ovrld; break; case PERL_MAGIC_bm: vtable = &PL_vtbl_bm; break; case PERL_MAGIC_regdata: vtable = &PL_vtbl_regdata; break; case PERL_MAGIC_regdata_names: vtable = &PL_vtbl_regdata_names; break; case PERL_MAGIC_regdatum: vtable = &PL_vtbl_regdatum; break; case PERL_MAGIC_env: vtable = &PL_vtbl_env; break; case PERL_MAGIC_fm: vtable = &PL_vtbl_fm; break; case PERL_MAGIC_envelem: vtable = &PL_vtbl_envelem; break; case PERL_MAGIC_regex_global: vtable = &PL_vtbl_mglob; break; case PERL_MAGIC_isa: vtable = &PL_vtbl_isa; break; case PERL_MAGIC_isaelem: vtable = &PL_vtbl_isaelem; break; case PERL_MAGIC_nkeys: vtable = &PL_vtbl_nkeys; break; case PERL_MAGIC_dbfile: vtable = NULL; break; case PERL_MAGIC_dbline: vtable = &PL_vtbl_dbline; break; #ifdef USE_LOCALE_COLLATE case PERL_MAGIC_collxfrm: vtable = &PL_vtbl_collxfrm; break; #endif /* USE_LOCALE_COLLATE */ case PERL_MAGIC_tied: vtable = &PL_vtbl_pack; break; case PERL_MAGIC_tiedelem: case PERL_MAGIC_tiedscalar: vtable = &PL_vtbl_packelem; break; case PERL_MAGIC_qr: vtable = &PL_vtbl_regexp; break; case PERL_MAGIC_hints: /* As this vtable is all NULL, we can reuse it. */ case PERL_MAGIC_sig: vtable = &PL_vtbl_sig; break; case PERL_MAGIC_sigelem: vtable = &PL_vtbl_sigelem; break; case PERL_MAGIC_taint: vtable = &PL_vtbl_taint; break; case PERL_MAGIC_uvar: vtable = &PL_vtbl_uvar; break; case PERL_MAGIC_vec: vtable = &PL_vtbl_vec; break; case PERL_MAGIC_arylen_p: case PERL_MAGIC_rhash: case PERL_MAGIC_symtab: case PERL_MAGIC_vstring: vtable = NULL; break; case PERL_MAGIC_utf8: vtable = &PL_vtbl_utf8; break; case PERL_MAGIC_substr: vtable = &PL_vtbl_substr; break; case PERL_MAGIC_defelem: vtable = &PL_vtbl_defelem; break; case PERL_MAGIC_arylen: vtable = &PL_vtbl_arylen; break; case PERL_MAGIC_pos: vtable = &PL_vtbl_pos; break; case PERL_MAGIC_backref: vtable = &PL_vtbl_backref; break; case PERL_MAGIC_hintselem: vtable = &PL_vtbl_hintselem; break; case PERL_MAGIC_ext: /* Reserved for use by extensions not perl internals. */ /* Useful for attaching extension internal data to perl vars. */ /* Note that multiple extensions may clash if magical scalars */ /* etc holding private data from one are passed to another. */ vtable = NULL; break; default: Perl_croak(aTHX_ "Don't know how to handle magic of type \\%o", how); } /* Rest of work is done else where */ mg = sv_magicext(sv,obj,how,vtable,name,namlen); switch (how) { case PERL_MAGIC_taint: mg->mg_len = 1; break; case PERL_MAGIC_ext: case PERL_MAGIC_dbfile: SvRMAGICAL_on(sv); break; } } /* =for apidoc sv_unmagic Removes all magic of type C from an SV. =cut */ int Perl_sv_unmagic(pTHX_ SV *sv, int type) { MAGIC* mg; MAGIC** mgp; if (SvTYPE(sv) < SVt_PVMG || !SvMAGIC(sv)) return 0; mgp = &(((XPVMG*) SvANY(sv))->xmg_u.xmg_magic); for (mg = *mgp; mg; mg = *mgp) { if (mg->mg_type == type) { const MGVTBL* const vtbl = mg->mg_virtual; *mgp = mg->mg_moremagic; if (vtbl && vtbl->svt_free) CALL_FPTR(vtbl->svt_free)(aTHX_ sv, mg); if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) { if (mg->mg_len > 0) Safefree(mg->mg_ptr); else if (mg->mg_len == HEf_SVKEY) SvREFCNT_dec((SV*)mg->mg_ptr); else if (mg->mg_type == PERL_MAGIC_utf8) Safefree(mg->mg_ptr); } if (mg->mg_flags & MGf_REFCOUNTED) SvREFCNT_dec(mg->mg_obj); Safefree(mg); } else mgp = &mg->mg_moremagic; } if (!SvMAGIC(sv)) { SvMAGICAL_off(sv); SvFLAGS(sv) |= (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT; SvMAGIC_set(sv, NULL); } return 0; } /* =for apidoc sv_rvweaken Weaken a reference: set the C flag on this RV; give the referred-to SV C magic if it hasn't already; and push a back-reference to this RV onto the array of backreferences associated with that magic. If the RV is magical, set magic will be called after the RV is cleared. =cut */ SV * Perl_sv_rvweaken(pTHX_ SV *sv) { SV *tsv; if (!SvOK(sv)) /* let undefs pass */ return sv; if (!SvROK(sv)) Perl_croak(aTHX_ "Can't weaken a nonreference"); else if (SvWEAKREF(sv)) { if (ckWARN(WARN_MISC)) Perl_warner(aTHX_ packWARN(WARN_MISC), "Reference is already weak"); return sv; } tsv = SvRV(sv); Perl_sv_add_backref(aTHX_ tsv, sv); SvWEAKREF_on(sv); SvREFCNT_dec(tsv); return sv; } /* Give tsv backref magic if it hasn't already got it, then push a * back-reference to sv onto the array associated with the backref magic. */ void Perl_sv_add_backref(pTHX_ SV *tsv, SV *sv) { dVAR; AV *av; if (SvTYPE(tsv) == SVt_PVHV) { AV **const avp = Perl_hv_backreferences_p(aTHX_ (HV*)tsv); av = *avp; if (!av) { /* There is no AV in the offical place - try a fixup. */ MAGIC *const mg = mg_find(tsv, PERL_MAGIC_backref); if (mg) { /* Aha. They've got it stowed in magic. Bring it back. */ av = (AV*)mg->mg_obj; /* Stop mg_free decreasing the refernce count. */ mg->mg_obj = NULL; /* Stop mg_free even calling the destructor, given that there's no AV to free up. */ mg->mg_virtual = 0; sv_unmagic(tsv, PERL_MAGIC_backref); } else { av = newAV(); AvREAL_off(av); SvREFCNT_inc_simple_void(av); } *avp = av; } } else { const MAGIC *const mg = SvMAGICAL(tsv) ? mg_find(tsv, PERL_MAGIC_backref) : NULL; if (mg) av = (AV*)mg->mg_obj; else { av = newAV(); AvREAL_off(av); sv_magic(tsv, (SV*)av, PERL_MAGIC_backref, NULL, 0); /* av now has a refcnt of 2, which avoids it getting freed * before us during global cleanup. The extra ref is removed * by magic_killbackrefs() when tsv is being freed */ } } if (AvFILLp(av) >= AvMAX(av)) { av_extend(av, AvFILLp(av)+1); } AvARRAY(av)[++AvFILLp(av)] = sv; /* av_push() */ } /* delete a back-reference to ourselves from the backref magic associated * with the SV we point to. */ STATIC void S_sv_del_backref(pTHX_ SV *tsv, SV *sv) { dVAR; AV *av = NULL; SV **svp; I32 i; if (SvTYPE(tsv) == SVt_PVHV && SvOOK(tsv)) { av = *Perl_hv_backreferences_p(aTHX_ (HV*)tsv); /* We mustn't attempt to "fix up" the hash here by moving the backreference array back to the hv_aux structure, as that is stored in the main HvARRAY(), and hfreentries assumes that no-one reallocates HvARRAY() while it is running. */ } if (!av) { const MAGIC *const mg = SvMAGICAL(tsv) ? mg_find(tsv, PERL_MAGIC_backref) : NULL; if (mg) av = (AV *)mg->mg_obj; } if (!av) { if (PL_in_clean_all) return; Perl_croak(aTHX_ "panic: del_backref"); } if (SvIS_FREED(av)) return; svp = AvARRAY(av); /* We shouldn't be in here more than once, but for paranoia reasons lets not assume this. */ for (i = AvFILLp(av); i >= 0; i--) { if (svp[i] == sv) { const SSize_t fill = AvFILLp(av); if (i != fill) { /* We weren't the last entry. An unordered list has this property that you can take the last element off the end to fill the hole, and it's still an unordered list :-) */ svp[i] = svp[fill]; } svp[fill] = NULL; AvFILLp(av) = fill - 1; } } } int Perl_sv_kill_backrefs(pTHX_ SV *sv, AV *av) { SV **svp = AvARRAY(av); PERL_UNUSED_ARG(sv); /* Not sure why the av can get freed ahead of its sv, but somehow it does in ext/B/t/bytecode.t test 15 (involving print ) */ if (svp && !SvIS_FREED(av)) { SV *const *const last = svp + AvFILLp(av); while (svp <= last) { if (*svp) { SV *const referrer = *svp; if (SvWEAKREF(referrer)) { /* XXX Should we check that it hasn't changed? */ SvRV_set(referrer, 0); SvOK_off(referrer); SvWEAKREF_off(referrer); SvSETMAGIC(referrer); } else if (SvTYPE(referrer) == SVt_PVGV || SvTYPE(referrer) == SVt_PVLV) { /* You lookin' at me? */ assert(GvSTASH(referrer)); assert(GvSTASH(referrer) == (HV*)sv); GvSTASH(referrer) = 0; } else { Perl_croak(aTHX_ "panic: magic_killbackrefs (flags=%"UVxf")", (UV)SvFLAGS(referrer)); } *svp = NULL; } svp++; } } SvREFCNT_dec(av); /* remove extra count added by sv_add_backref() */ return 0; } /* =for apidoc sv_insert Inserts a string at the specified offset/length within the SV. Similar to the Perl substr() function. =cut */ void Perl_sv_insert(pTHX_ SV *bigstr, STRLEN offset, STRLEN len, const char *little, STRLEN littlelen) { dVAR; register char *big; register char *mid; register char *midend; register char *bigend; register I32 i; STRLEN curlen; if (!bigstr) Perl_croak(aTHX_ "Can't modify non-existent substring"); SvPV_force(bigstr, curlen); (void)SvPOK_only_UTF8(bigstr); if (offset + len > curlen) { SvGROW(bigstr, offset+len+1); Zero(SvPVX(bigstr)+curlen, offset+len-curlen, char); SvCUR_set(bigstr, offset+len); } SvTAINT(bigstr); i = littlelen - len; if (i > 0) { /* string might grow */ big = SvGROW(bigstr, SvCUR(bigstr) + i + 1); mid = big + offset + len; midend = bigend = big + SvCUR(bigstr); bigend += i; *bigend = '\0'; while (midend > mid) /* shove everything down */ *--bigend = *--midend; Move(little,big+offset,littlelen,char); SvCUR_set(bigstr, SvCUR(bigstr) + i); SvSETMAGIC(bigstr); return; } else if (i == 0) { Move(little,SvPVX(bigstr)+offset,len,char); SvSETMAGIC(bigstr); return; } big = SvPVX(bigstr); mid = big + offset; midend = mid + len; bigend = big + SvCUR(bigstr); if (midend > bigend) Perl_croak(aTHX_ "panic: sv_insert"); if (mid - big > bigend - midend) { /* faster to shorten from end */ if (littlelen) { Move(little, mid, littlelen,char); mid += littlelen; } i = bigend - midend; if (i > 0) { Move(midend, mid, i,char); mid += i; } *mid = '\0'; SvCUR_set(bigstr, mid - big); } else if ((i = mid - big)) { /* faster from front */ midend -= littlelen; mid = midend; sv_chop(bigstr,midend-i); big += i; while (i--) *--midend = *--big; if (littlelen) Move(little, mid, littlelen,char); } else if (littlelen) { midend -= littlelen; sv_chop(bigstr,midend); Move(little,midend,littlelen,char); } else { sv_chop(bigstr,midend); } SvSETMAGIC(bigstr); } /* =for apidoc sv_replace Make the first argument a copy of the second, then delete the original. The target SV physically takes over ownership of the body of the source SV and inherits its flags; however, the target keeps any magic it owns, and any magic in the source is discarded. Note that this is a rather specialist SV copying operation; most of the time you'll want to use C or one of its many macro front-ends. =cut */ void Perl_sv_replace(pTHX_ register SV *sv, register SV *nsv) { dVAR; const U32 refcnt = SvREFCNT(sv); SV_CHECK_THINKFIRST_COW_DROP(sv); if (SvREFCNT(nsv) != 1) { Perl_croak(aTHX_ "panic: reference miscount on nsv in sv_replace() (%" UVuf " != 1)", (UV) SvREFCNT(nsv)); } if (SvMAGICAL(sv)) { if (SvMAGICAL(nsv)) mg_free(nsv); else sv_upgrade(nsv, SVt_PVMG); SvMAGIC_set(nsv, SvMAGIC(sv)); SvFLAGS(nsv) |= SvMAGICAL(sv); SvMAGICAL_off(sv); SvMAGIC_set(sv, NULL); } SvREFCNT(sv) = 0; sv_clear(sv); assert(!SvREFCNT(sv)); #ifdef DEBUG_LEAKING_SCALARS sv->sv_flags = nsv->sv_flags; sv->sv_any = nsv->sv_any; sv->sv_refcnt = nsv->sv_refcnt; sv->sv_u = nsv->sv_u; #else StructCopy(nsv,sv,SV); #endif /* Currently could join these into one piece of pointer arithmetic, but it would be unclear. */ if(SvTYPE(sv) == SVt_IV) SvANY(sv) = (XPVIV*)((char*)&(sv->sv_u.svu_iv) - STRUCT_OFFSET(XPVIV, xiv_iv)); else if (SvTYPE(sv) == SVt_RV) { SvANY(sv) = &sv->sv_u.svu_rv; } #ifdef PERL_OLD_COPY_ON_WRITE if (SvIsCOW_normal(nsv)) { /* We need to follow the pointers around the loop to make the previous SV point to sv, rather than nsv. */ SV *next; SV *current = nsv; while ((next = SV_COW_NEXT_SV(current)) != nsv) { assert(next); current = next; assert(SvPVX_const(current) == SvPVX_const(nsv)); } /* Make the SV before us point to the SV after us. */ if (DEBUG_C_TEST) { PerlIO_printf(Perl_debug_log, "previous is\n"); sv_dump(current); PerlIO_printf(Perl_debug_log, "move it from 0x%"UVxf" to 0x%"UVxf"\n", (UV) SV_COW_NEXT_SV(current), (UV) sv); } SV_COW_NEXT_SV_SET(current, sv); } #endif SvREFCNT(sv) = refcnt; SvFLAGS(nsv) |= SVTYPEMASK; /* Mark as freed */ SvREFCNT(nsv) = 0; del_SV(nsv); } /* =for apidoc sv_clear Clear an SV: call any destructors, free up any memory used by the body, and free the body itself. The SV's head is I freed, although its type is set to all 1's so that it won't inadvertently be assumed to be live during global destruction etc. This function should only be called when REFCNT is zero. Most of the time you'll want to call C (or its macro wrapper C) instead. =cut */ void Perl_sv_clear(pTHX_ register SV *sv) { dVAR; const U32 type = SvTYPE(sv); const struct body_details *const sv_type_details = bodies_by_type + type; assert(sv); assert(SvREFCNT(sv) == 0); if (type <= SVt_IV) { /* See the comment in sv.h about the collusion between this early return and the overloading of the NULL and IV slots in the size table. */ return; } if (SvOBJECT(sv)) { if (PL_defstash) { /* Still have a symbol table? */ dSP; HV* stash; do { CV* destructor; stash = SvSTASH(sv); destructor = StashHANDLER(stash,DESTROY); if (destructor) { SV* const tmpref = newRV(sv); SvREADONLY_on(tmpref); /* DESTROY() could be naughty */ ENTER; PUSHSTACKi(PERLSI_DESTROY); EXTEND(SP, 2); PUSHMARK(SP); PUSHs(tmpref); PUTBACK; call_sv((SV*)destructor, G_DISCARD|G_EVAL|G_KEEPERR|G_VOID); POPSTACK; SPAGAIN; LEAVE; if(SvREFCNT(tmpref) < 2) { /* tmpref is not kept alive! */ SvREFCNT(sv)--; SvRV_set(tmpref, NULL); SvROK_off(tmpref); } SvREFCNT_dec(tmpref); } } while (SvOBJECT(sv) && SvSTASH(sv) != stash); if (SvREFCNT(sv)) { if (PL_in_clean_objs) Perl_croak(aTHX_ "DESTROY created new reference to dead object '%s'", HvNAME_get(stash)); /* DESTROY gave object new lease on life */ return; } } if (SvOBJECT(sv)) { SvREFCNT_dec(SvSTASH(sv)); /* possibly of changed persuasion */ SvOBJECT_off(sv); /* Curse the object. */ if (type != SVt_PVIO) --PL_sv_objcount; /* XXX Might want something more general */ } } if (type >= SVt_PVMG) { if (type == SVt_PVMG && SvPAD_OUR(sv)) { SvREFCNT_dec(OURSTASH(sv)); } else if (SvMAGIC(sv)) mg_free(sv); if (type == SVt_PVMG && SvPAD_TYPED(sv)) SvREFCNT_dec(SvSTASH(sv)); } switch (type) { /* case SVt_BIND: */ case SVt_PVIO: if (IoIFP(sv) && IoIFP(sv) != PerlIO_stdin() && IoIFP(sv) != PerlIO_stdout() && IoIFP(sv) != PerlIO_stderr()) { io_close((IO*)sv, FALSE); } if (IoDIRP(sv) && !(IoFLAGS(sv) & IOf_FAKE_DIRP)) PerlDir_close(IoDIRP(sv)); IoDIRP(sv) = (DIR*)NULL; Safefree(IoTOP_NAME(sv)); Safefree(IoFMT_NAME(sv)); Safefree(IoBOTTOM_NAME(sv)); goto freescalar; case SVt_PVCV: case SVt_PVFM: cv_undef((CV*)sv); goto freescalar; case SVt_PVHV: Perl_hv_kill_backrefs(aTHX_ (HV*)sv); hv_undef((HV*)sv); break; case SVt_PVAV: av_undef((AV*)sv); break; case SVt_PVLV: if (LvTYPE(sv) == 'T') { /* for tie: return HE to pool */ SvREFCNT_dec(HeKEY_sv((HE*)LvTARG(sv))); HeNEXT((HE*)LvTARG(sv)) = PL_hv_fetch_ent_mh; PL_hv_fetch_ent_mh = (HE*)LvTARG(sv); } else if (LvTYPE(sv) != 't') /* unless tie: unrefcnted fake SV** */ SvREFCNT_dec(LvTARG(sv)); goto freescalar; case SVt_PVGV: if (isGV_with_GP(sv)) { gp_free((GV*)sv); if (GvNAME_HEK(sv)) unshare_hek(GvNAME_HEK(sv)); /* If we're in a stash, we don't own a reference to it. However it does have a back reference to us, which needs to be cleared. */ if (!SvVALID(sv) && GvSTASH(sv)) sv_del_backref((SV*)GvSTASH(sv), sv); } case SVt_PVMG: case SVt_PVNV: case SVt_PVIV: freescalar: /* Don't bother with SvOOK_off(sv); as we're only going to free it. */ if (SvOOK(sv)) { SvPV_set(sv, SvPVX_mutable(sv) - SvIVX(sv)); /* Don't even bother with turning off the OOK flag. */ } case SVt_PV: case SVt_RV: if (SvROK(sv)) { SV * const target = SvRV(sv); if (SvWEAKREF(sv)) sv_del_backref(target, sv); else SvREFCNT_dec(target); } #ifdef PERL_OLD_COPY_ON_WRITE else if (SvPVX_const(sv)) { if (SvIsCOW(sv)) { /* I believe I need to grab the global SV mutex here and then recheck the COW status. */ if (DEBUG_C_TEST) { PerlIO_printf(Perl_debug_log, "Copy on write: clear\n"); sv_dump(sv); } sv_release_COW(sv, SvPVX_const(sv), SvLEN(sv), SV_COW_NEXT_SV(sv)); /* And drop it here. */ SvFAKE_off(sv); } else if (SvLEN(sv)) { Safefree(SvPVX_const(sv)); } } #else else if (SvPVX_const(sv) && SvLEN(sv)) Safefree(SvPVX_mutable(sv)); else if (SvPVX_const(sv) && SvREADONLY(sv) && SvFAKE(sv)) { unshare_hek(SvSHARED_HEK_FROM_PV(SvPVX_const(sv))); SvFAKE_off(sv); } #endif break; case SVt_NV: break; } SvFLAGS(sv) &= SVf_BREAK; SvFLAGS(sv) |= SVTYPEMASK; if (sv_type_details->arena) { del_body(((char *)SvANY(sv) + sv_type_details->offset), &PL_body_roots[type]); } else if (sv_type_details->body_size) { my_safefree(SvANY(sv)); } } /* =for apidoc sv_newref Increment an SV's reference count. Use the C wrapper instead. =cut */ SV * Perl_sv_newref(pTHX_ SV *sv) { PERL_UNUSED_CONTEXT; if (sv) (SvREFCNT(sv))++; return sv; } /* =for apidoc sv_free Decrement an SV's reference count, and if it drops to zero, call C to invoke destructors and free up any memory used by the body; finally, deallocate the SV's head itself. Normally called via a wrapper macro C. =cut */ void Perl_sv_free(pTHX_ SV *sv) { dVAR; if (!sv) return; if (SvREFCNT(sv) == 0) { if (SvFLAGS(sv) & SVf_BREAK) /* this SV's refcnt has been artificially decremented to * trigger cleanup */ return; if (PL_in_clean_all) /* All is fair */ return; if (SvREADONLY(sv) && SvIMMORTAL(sv)) { /* make sure SvREFCNT(sv)==0 happens very seldom */ SvREFCNT(sv) = (~(U32)0)/2; return; } if (ckWARN_d(WARN_INTERNAL)) { Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Attempt to free unreferenced scalar: SV 0x%"UVxf pTHX__FORMAT, PTR2UV(sv) pTHX__VALUE); #ifdef DEBUG_LEAKING_SCALARS_FORK_DUMP Perl_dump_sv_child(aTHX_ sv); #endif } return; } if (--(SvREFCNT(sv)) > 0) return; Perl_sv_free2(aTHX_ sv); } void Perl_sv_free2(pTHX_ SV *sv) { dVAR; #ifdef DEBUGGING if (SvTEMP(sv)) { if (ckWARN_d(WARN_DEBUGGING)) Perl_warner(aTHX_ packWARN(WARN_DEBUGGING), "Attempt to free temp prematurely: SV 0x%"UVxf pTHX__FORMAT, PTR2UV(sv) pTHX__VALUE); return; } #endif if (SvREADONLY(sv) && SvIMMORTAL(sv)) { /* make sure SvREFCNT(sv)==0 happens very seldom */ SvREFCNT(sv) = (~(U32)0)/2; return; } sv_clear(sv); if (! SvREFCNT(sv)) del_SV(sv); } /* =for apidoc sv_len Returns the length of the string in the SV. Handles magic and type coercion. See also C, which gives raw access to the xpv_cur slot. =cut */ STRLEN Perl_sv_len(pTHX_ register SV *sv) { STRLEN len; if (!sv) return 0; if (SvGMAGICAL(sv)) len = mg_length(sv); else (void)SvPV_const(sv, len); return len; } /* =for apidoc sv_len_utf8 Returns the number of characters in the string in an SV, counting wide UTF-8 bytes as a single character. Handles magic and type coercion. =cut */ /* * The length is cached in PERL_UTF8_magic, in the mg_len field. Also the * mg_ptr is used, by sv_pos_u2b() and sv_pos_b2u() - see the comments below. * (Note that the mg_len is not the length of the mg_ptr field. * This allows the cache to store the character length of the string without * needing to malloc() extra storage to attach to the mg_ptr.) * */ STRLEN Perl_sv_len_utf8(pTHX_ register SV *sv) { if (!sv) return 0; if (SvGMAGICAL(sv)) return mg_length(sv); else { STRLEN len; const U8 *s = (U8*)SvPV_const(sv, len); if (PL_utf8cache) { STRLEN ulen; MAGIC *mg = SvMAGICAL(sv) ? mg_find(sv, PERL_MAGIC_utf8) : 0; if (mg && mg->mg_len != -1) { ulen = mg->mg_len; if (PL_utf8cache < 0) { const STRLEN real = Perl_utf8_length(aTHX_ s, s + len); if (real != ulen) { /* Need to turn the assertions off otherwise we may recurse infinitely while printing error messages. */ SAVEI8(PL_utf8cache); PL_utf8cache = 0; Perl_croak(aTHX_ "panic: sv_len_utf8 cache %"UVuf " real %"UVuf" for %"SVf, (UV) ulen, (UV) real, (void*)sv); } } } else { ulen = Perl_utf8_length(aTHX_ s, s + len); if (!SvREADONLY(sv)) { if (!mg) { mg = sv_magicext(sv, 0, PERL_MAGIC_utf8, &PL_vtbl_utf8, 0, 0); } assert(mg); mg->mg_len = ulen; } } return ulen; } return Perl_utf8_length(aTHX_ s, s + len); } } /* Walk forwards to find the byte corresponding to the passed in UTF-8 offset. */ static STRLEN S_sv_pos_u2b_forwards(const U8 *const start, const U8 *const send, STRLEN uoffset) { const U8 *s = start; while (s < send && uoffset--) s += UTF8SKIP(s); if (s > send) { /* This is the existing behaviour. Possibly it should be a croak, as it's actually a bounds error */ s = send; } return s - start; } /* Given the length of the string in both bytes and UTF-8 characters, decide whether to walk forwards or backwards to find the byte corresponding to the passed in UTF-8 offset. */ static STRLEN S_sv_pos_u2b_midway(const U8 *const start, const U8 *send, STRLEN uoffset, STRLEN uend) { STRLEN backw = uend - uoffset; if (uoffset < 2 * backw) { /* The assumption is that going forwards is twice the speed of going forward (that's where the 2 * backw comes from). (The real figure of course depends on the UTF-8 data.) */ return sv_pos_u2b_forwards(start, send, uoffset); } while (backw--) { send--; while (UTF8_IS_CONTINUATION(*send)) send--; } return send - start; } /* For the string representation of the given scalar, find the byte corresponding to the passed in UTF-8 offset. uoffset0 and boffset0 give another position in the string, *before* the sought offset, which (which is always true, as 0, 0 is a valid pair of positions), which should help reduce the amount of linear searching. If *mgp is non-NULL, it should point to the UTF-8 cache magic, which will be used to reduce the amount of linear searching. The cache will be created if necessary, and the found value offered to it for update. */ static STRLEN S_sv_pos_u2b_cached(pTHX_ SV *sv, MAGIC **mgp, const U8 *const start, const U8 *const send, STRLEN uoffset, STRLEN uoffset0, STRLEN boffset0) { STRLEN boffset = 0; /* Actually always set, but let's keep gcc happy. */ bool found = FALSE; assert (uoffset >= uoffset0); if (SvMAGICAL(sv) && !SvREADONLY(sv) && PL_utf8cache && (*mgp || (*mgp = mg_find(sv, PERL_MAGIC_utf8)))) { if ((*mgp)->mg_ptr) { STRLEN *cache = (STRLEN *) (*mgp)->mg_ptr; if (cache[0] == uoffset) { /* An exact match. */ return cache[1]; } if (cache[2] == uoffset) { /* An exact match. */ return cache[3]; } if (cache[0] < uoffset) { /* The cache already knows part of the way. */ if (cache[0] > uoffset0) { /* The cache knows more than the passed in pair */ uoffset0 = cache[0]; boffset0 = cache[1]; } if ((*mgp)->mg_len != -1) { /* And we know the end too. */ boffset = boffset0 + sv_pos_u2b_midway(start + boffset0, send, uoffset - uoffset0, (*mgp)->mg_len - uoffset0); } else { boffset = boffset0 + sv_pos_u2b_forwards(start + boffset0, send, uoffset - uoffset0); } } else if (cache[2] < uoffset) { /* We're between the two cache entries. */ if (cache[2] > uoffset0) { /* and the cache knows more than the passed in pair */ uoffset0 = cache[2]; boffset0 = cache[3]; } boffset = boffset0 + sv_pos_u2b_midway(start + boffset0, start + cache[1], uoffset - uoffset0, cache[0] - uoffset0); } else { boffset = boffset0 + sv_pos_u2b_midway(start + boffset0, start + cache[3], uoffset - uoffset0, cache[2] - uoffset0); } found = TRUE; } else if ((*mgp)->mg_len != -1) { /* If we can take advantage of a passed in offset, do so. */ /* In fact, offset0 is either 0, or less than offset, so don't need to worry about the other possibility. */ boffset = boffset0 + sv_pos_u2b_midway(start + boffset0, send, uoffset - uoffset0, (*mgp)->mg_len - uoffset0); found = TRUE; } } if (!found || PL_utf8cache < 0) { const STRLEN real_boffset = boffset0 + sv_pos_u2b_forwards(start + boffset0, send, uoffset - uoffset0); if (found && PL_utf8cache < 0) { if (real_boffset != boffset) { /* Need to turn the assertions off otherwise we may recurse infinitely while printing error messages. */ SAVEI8(PL_utf8cache); PL_utf8cache = 0; Perl_croak(aTHX_ "panic: sv_pos_u2b_cache cache %"UVuf " real %"UVuf" for %"SVf, (UV) boffset, (UV) real_boffset, (void*)sv); } } boffset = real_boffset; } S_utf8_mg_pos_cache_update(aTHX_ sv, mgp, boffset, uoffset, send - start); return boffset; } /* =for apidoc sv_pos_u2b Converts the value pointed to by offsetp from a count of UTF-8 chars from the start of the string, to a count of the equivalent number of bytes; if lenp is non-zero, it does the same to lenp, but this time starting from the offset, rather than from the start of the string. Handles magic and type coercion. =cut */ /* * sv_pos_u2b() uses, like sv_pos_b2u(), the mg_ptr of the potential * PERL_UTF8_magic of the sv to store the mapping between UTF-8 and * byte offsets. See also the comments of S_utf8_mg_pos_cache_update(). * */ void Perl_sv_pos_u2b(pTHX_ register SV *sv, I32* offsetp, I32* lenp) { const U8 *start; STRLEN len; if (!sv) return; start = (U8*)SvPV_const(sv, len); if (len) { STRLEN uoffset = (STRLEN) *offsetp; const U8 * const send = start + len; MAGIC *mg = NULL; const STRLEN boffset = sv_pos_u2b_cached(sv, &mg, start, send, uoffset, 0, 0); *offsetp = (I32) boffset; if (lenp) { /* Convert the relative offset to absolute. */ const STRLEN uoffset2 = uoffset + (STRLEN) *lenp; const STRLEN boffset2 = sv_pos_u2b_cached(sv, &mg, start, send, uoffset2, uoffset, boffset) - boffset; *lenp = boffset2; } } else { *offsetp = 0; if (lenp) *lenp = 0; } return; } /* Create and update the UTF8 magic offset cache, with the proffered utf8/ byte length pairing. The (byte) length of the total SV is passed in too, as blen, because for some (more esoteric) SVs, the call to SvPV_const() may not have updated SvCUR, so we can't rely on reading it directly. The proffered utf8/byte length pairing isn't used if the cache already has two pairs, and swapping either for the proffered pair would increase the RMS of the intervals between known byte offsets. The cache itself consists of 4 STRLEN values 0: larger UTF-8 offset 1: corresponding byte offset 2: smaller UTF-8 offset 3: corresponding byte offset Unused cache pairs have the value 0, 0. Keeping the cache "backwards" means that the invariant of cache[0] >= cache[2] is maintained even with empty slots, which means that the code that uses it doesn't need to worry if only 1 entry has actually been set to non-zero. It also makes the "position beyond the end of the cache" logic much simpler, as the first slot is always the one to start from. */ static void S_utf8_mg_pos_cache_update(pTHX_ SV *sv, MAGIC **mgp, STRLEN byte, STRLEN utf8, STRLEN blen) { STRLEN *cache; if (SvREADONLY(sv)) return; if (!*mgp) { *mgp = sv_magicext(sv, 0, PERL_MAGIC_utf8, (MGVTBL*)&PL_vtbl_utf8, 0, 0); (*mgp)->mg_len = -1; } assert(*mgp); if (!(cache = (STRLEN *)(*mgp)->mg_ptr)) { Newxz(cache, PERL_MAGIC_UTF8_CACHESIZE * 2, STRLEN); (*mgp)->mg_ptr = (char *) cache; } assert(cache); if (PL_utf8cache < 0) { const U8 *start = (const U8 *) SvPVX_const(sv); const STRLEN realutf8 = utf8_length(start, start + byte); if (realutf8 != utf8) { /* Need to turn the assertions off otherwise we may recurse infinitely while printing error messages. */ SAVEI8(PL_utf8cache); PL_utf8cache = 0; Perl_croak(aTHX_ "panic: utf8_mg_pos_cache_update cache %"UVuf " real %"UVuf" for %"SVf, (UV) utf8, (UV) realutf8, (void*)sv); } } /* Cache is held with the later position first, to simplify the code that deals with unbounded ends. */ ASSERT_UTF8_CACHE(cache); if (cache[1] == 0) { /* Cache is totally empty */ cache[0] = utf8; cache[1] = byte; } else if (cache[3] == 0) { if (byte > cache[1]) { /* New one is larger, so goes first. */ cache[2] = cache[0]; cache[3] = cache[1]; cache[0] = utf8; cache[1] = byte; } else { cache[2] = utf8; cache[3] = byte; } } else { #define THREEWAY_SQUARE(a,b,c,d) \ ((float)((d) - (c))) * ((float)((d) - (c))) \ + ((float)((c) - (b))) * ((float)((c) - (b))) \ + ((float)((b) - (a))) * ((float)((b) - (a))) /* Cache has 2 slots in use, and we know three potential pairs. Keep the two that give the lowest RMS distance. Do the calcualation in bytes simply because we always know the byte length. squareroot has the same ordering as the positive value, so don't bother with the actual square root. */ const float existing = THREEWAY_SQUARE(0, cache[3], cache[1], blen); if (byte > cache[1]) { /* New position is after the existing pair of pairs. */ const float keep_earlier = THREEWAY_SQUARE(0, cache[3], byte, blen); const float keep_later = THREEWAY_SQUARE(0, cache[1], byte, blen); if (keep_later < keep_earlier) { if (keep_later < existing) { cache[2] = cache[0]; cache[3] = cache[1]; cache[0] = utf8; cache[1] = byte; } } else { if (keep_earlier < existing) { cache[0] = utf8; cache[1] = byte; } } } else if (byte > cache[3]) { /* New position is between the existing pair of pairs. */ const float keep_earlier = THREEWAY_SQUARE(0, cache[3], byte, blen); const float keep_later = THREEWAY_SQUARE(0, byte, cache[1], blen); if (keep_later < keep_earlier) { if (keep_later < existing) { cache[2] = utf8; cache[3] = byte; } } else { if (keep_earlier < existing) { cache[0] = utf8; cache[1] = byte; } } } else { /* New position is before the existing pair of pairs. */ const float keep_earlier = THREEWAY_SQUARE(0, byte, cache[3], blen); const float keep_later = THREEWAY_SQUARE(0, byte, cache[1], blen); if (keep_later < keep_earlier) { if (keep_later < existing) { cache[2] = utf8; cache[3] = byte; } } else { if (keep_earlier < existing) { cache[0] = cache[2]; cache[1] = cache[3]; cache[2] = utf8; cache[3] = byte; } } } } ASSERT_UTF8_CACHE(cache); } /* We already know all of the way, now we may be able to walk back. The same assumption is made as in S_sv_pos_u2b_midway(), namely that walking backward is half the speed of walking forward. */ static STRLEN S_sv_pos_b2u_midway(pTHX_ const U8 *s, const U8 *const target, const U8 *end, STRLEN endu) { const STRLEN forw = target - s; STRLEN backw = end - target; if (forw < 2 * backw) { return utf8_length(s, target); } while (end > target) { end--; while (UTF8_IS_CONTINUATION(*end)) { end--; } endu--; } return endu; } /* =for apidoc sv_pos_b2u Converts the value pointed to by offsetp from a count of bytes from the start of the string, to a count of the equivalent number of UTF-8 chars. Handles magic and type coercion. =cut */ /* * sv_pos_b2u() uses, like sv_pos_u2b(), the mg_ptr of the potential * PERL_UTF8_magic of the sv to store the mapping between UTF-8 and * byte offsets. * */ void Perl_sv_pos_b2u(pTHX_ register SV* sv, I32* offsetp) { const U8* s; const STRLEN byte = *offsetp; STRLEN len = 0; /* Actually always set, but let's keep gcc happy. */ STRLEN blen; MAGIC* mg = NULL; const U8* send; bool found = FALSE; if (!sv) return; s = (const U8*)SvPV_const(sv, blen); if (blen < byte) Perl_croak(aTHX_ "panic: sv_pos_b2u: bad byte offset"); send = s + byte; if (SvMAGICAL(sv) && !SvREADONLY(sv) && PL_utf8cache && (mg = mg_find(sv, PERL_MAGIC_utf8))) { if (mg->mg_ptr) { STRLEN * const cache = (STRLEN *) mg->mg_ptr; if (cache[1] == byte) { /* An exact match. */ *offsetp = cache[0]; return; } if (cache[3] == byte) { /* An exact match. */ *offsetp = cache[2]; return; } if (cache[1] < byte) { /* We already know part of the way. */ if (mg->mg_len != -1) { /* Actually, we know the end too. */ len = cache[0] + S_sv_pos_b2u_midway(aTHX_ s + cache[1], send, s + blen, mg->mg_len - cache[0]); } else { len = cache[0] + utf8_length(s + cache[1], send); } } else if (cache[3] < byte) { /* We're between the two cached pairs, so we do the calculation offset by the byte/utf-8 positions for the earlier pair, then add the utf-8 characters from the string start to there. */ len = S_sv_pos_b2u_midway(aTHX_ s + cache[3], send, s + cache[1], cache[0] - cache[2]) + cache[2]; } else { /* cache[3] > byte */ len = S_sv_pos_b2u_midway(aTHX_ s, send, s + cache[3], cache[2]); } ASSERT_UTF8_CACHE(cache); found = TRUE; } else if (mg->mg_len != -1) { len = S_sv_pos_b2u_midway(aTHX_ s, send, s + blen, mg->mg_len); found = TRUE; } } if (!found || PL_utf8cache < 0) { const STRLEN real_len = utf8_length(s, send); if (found && PL_utf8cache < 0) { if (len != real_len) { /* Need to turn the assertions off otherwise we may recurse infinitely while printing error messages. */ SAVEI8(PL_utf8cache); PL_utf8cache = 0; Perl_croak(aTHX_ "panic: sv_pos_b2u cache %"UVuf " real %"UVuf" for %"SVf, (UV) len, (UV) real_len, (void*)sv); } } len = real_len; } *offsetp = len; S_utf8_mg_pos_cache_update(aTHX_ sv, &mg, byte, len, blen); } /* =for apidoc sv_eq Returns a boolean indicating whether the strings in the two SVs are identical. Is UTF-8 and 'use bytes' aware, handles get magic, and will coerce its args to strings if necessary. =cut */ I32 Perl_sv_eq(pTHX_ register SV *sv1, register SV *sv2) { dVAR; const char *pv1; STRLEN cur1; const char *pv2; STRLEN cur2; I32 eq = 0; char *tpv = NULL; SV* svrecode = NULL; if (!sv1) { pv1 = ""; cur1 = 0; } else { /* if pv1 and pv2 are the same, second SvPV_const call may * invalidate pv1, so we may need to make a copy */ if (sv1 == sv2 && (SvTHINKFIRST(sv1) || SvGMAGICAL(sv1))) { pv1 = SvPV_const(sv1, cur1); sv1 = sv_2mortal(newSVpvn(pv1, cur1)); if (SvUTF8(sv2)) SvUTF8_on(sv1); } pv1 = SvPV_const(sv1, cur1); } if (!sv2){ pv2 = ""; cur2 = 0; } else pv2 = SvPV_const(sv2, cur2); if (cur1 && cur2 && SvUTF8(sv1) != SvUTF8(sv2) && !IN_BYTES) { /* Differing utf8ness. * Do not UTF8size the comparands as a side-effect. */ if (PL_encoding) { if (SvUTF8(sv1)) { svrecode = newSVpvn(pv2, cur2); sv_recode_to_utf8(svrecode, PL_encoding); pv2 = SvPV_const(svrecode, cur2); } else { svrecode = newSVpvn(pv1, cur1); sv_recode_to_utf8(svrecode, PL_encoding); pv1 = SvPV_const(svrecode, cur1); } /* Now both are in UTF-8. */ if (cur1 != cur2) { SvREFCNT_dec(svrecode); return FALSE; } } else { bool is_utf8 = TRUE; if (SvUTF8(sv1)) { /* sv1 is the UTF-8 one, * if is equal it must be downgrade-able */ char * const pv = (char*)bytes_from_utf8((const U8*)pv1, &cur1, &is_utf8); if (pv != pv1) pv1 = tpv = pv; } else { /* sv2 is the UTF-8 one, * if is equal it must be downgrade-able */ char * const pv = (char *)bytes_from_utf8((const U8*)pv2, &cur2, &is_utf8); if (pv != pv2) pv2 = tpv = pv; } if (is_utf8) { /* Downgrade not possible - cannot be eq */ assert (tpv == 0); return FALSE; } } } if (cur1 == cur2) eq = (pv1 == pv2) || memEQ(pv1, pv2, cur1); SvREFCNT_dec(svrecode); if (tpv) Safefree(tpv); return eq; } /* =for apidoc sv_cmp Compares the strings in two SVs. Returns -1, 0, or 1 indicating whether the string in C is less than, equal to, or greater than the string in C. Is UTF-8 and 'use bytes' aware, handles get magic, and will coerce its args to strings if necessary. See also C. =cut */ I32 Perl_sv_cmp(pTHX_ register SV *sv1, register SV *sv2) { dVAR; STRLEN cur1, cur2; const char *pv1, *pv2; char *tpv = NULL; I32 cmp; SV *svrecode = NULL; if (!sv1) { pv1 = ""; cur1 = 0; } else pv1 = SvPV_const(sv1, cur1); if (!sv2) { pv2 = ""; cur2 = 0; } else pv2 = SvPV_const(sv2, cur2); if (cur1 && cur2 && SvUTF8(sv1) != SvUTF8(sv2) && !IN_BYTES) { /* Differing utf8ness. * Do not UTF8size the comparands as a side-effect. */ if (SvUTF8(sv1)) { if (PL_encoding) { svrecode = newSVpvn(pv2, cur2); sv_recode_to_utf8(svrecode, PL_encoding); pv2 = SvPV_const(svrecode, cur2); } else { pv2 = tpv = (char*)bytes_to_utf8((const U8*)pv2, &cur2); } } else { if (PL_encoding) { svrecode = newSVpvn(pv1, cur1); sv_recode_to_utf8(svrecode, PL_encoding); pv1 = SvPV_const(svrecode, cur1); } else { pv1 = tpv = (char*)bytes_to_utf8((const U8*)pv1, &cur1); } } } if (!cur1) { cmp = cur2 ? -1 : 0; } else if (!cur2) { cmp = 1; } else { const I32 retval = memcmp((const void*)pv1, (const void*)pv2, cur1 < cur2 ? cur1 : cur2); if (retval) { cmp = retval < 0 ? -1 : 1; } else if (cur1 == cur2) { cmp = 0; } else { cmp = cur1 < cur2 ? -1 : 1; } } SvREFCNT_dec(svrecode); if (tpv) Safefree(tpv); return cmp; } /* =for apidoc sv_cmp_locale Compares the strings in two SVs in a locale-aware manner. Is UTF-8 and 'use bytes' aware, handles get magic, and will coerce its args to strings if necessary. See also C. See also C. =cut */ I32 Perl_sv_cmp_locale(pTHX_ register SV *sv1, register SV *sv2) { dVAR; #ifdef USE_LOCALE_COLLATE char *pv1, *pv2; STRLEN len1, len2; I32 retval; if (PL_collation_standard) goto raw_compare; len1 = 0; pv1 = sv1 ? sv_collxfrm(sv1, &len1) : (char *) NULL; len2 = 0; pv2 = sv2 ? sv_collxfrm(sv2, &len2) : (char *) NULL; if (!pv1 || !len1) { if (pv2 && len2) return -1; else goto raw_compare; } else { if (!pv2 || !len2) return 1; } retval = memcmp((void*)pv1, (void*)pv2, len1 < len2 ? len1 : len2); if (retval) return retval < 0 ? -1 : 1; /* * When the result of collation is equality, that doesn't mean * that there are no differences -- some locales exclude some * characters from consideration. So to avoid false equalities, * we use the raw string as a tiebreaker. */ raw_compare: /*FALLTHROUGH*/ #endif /* USE_LOCALE_COLLATE */ return sv_cmp(sv1, sv2); } #ifdef USE_LOCALE_COLLATE /* =for apidoc sv_collxfrm Add Collate Transform magic to an SV if it doesn't already have it. Any scalar variable may carry PERL_MAGIC_collxfrm magic that contains the scalar data of the variable, but transformed to such a format that a normal memory comparison can be used to compare the data according to the locale settings. =cut */ char * Perl_sv_collxfrm(pTHX_ SV *sv, STRLEN *nxp) { dVAR; MAGIC *mg; mg = SvMAGICAL(sv) ? mg_find(sv, PERL_MAGIC_collxfrm) : (MAGIC *) NULL; if (!mg || !mg->mg_ptr || *(U32*)mg->mg_ptr != PL_collation_ix) { const char *s; char *xf; STRLEN len, xlen; if (mg) Safefree(mg->mg_ptr); s = SvPV_const(sv, len); if ((xf = mem_collxfrm(s, len, &xlen))) { if (SvREADONLY(sv)) { SAVEFREEPV(xf); *nxp = xlen; return xf + sizeof(PL_collation_ix); } if (! mg) { #ifdef PERL_OLD_COPY_ON_WRITE if (SvIsCOW(sv)) sv_force_normal_flags(sv, 0); #endif mg = sv_magicext(sv, 0, PERL_MAGIC_collxfrm, &PL_vtbl_collxfrm, 0, 0); assert(mg); } mg->mg_ptr = xf; mg->mg_len = xlen; } else { if (mg) { mg->mg_ptr = NULL; mg->mg_len = -1; } } } if (mg && mg->mg_ptr) { *nxp = mg->mg_len; return mg->mg_ptr + sizeof(PL_collation_ix); } else { *nxp = 0; return NULL; } } #endif /* USE_LOCALE_COLLATE */ /* =for apidoc sv_gets Get a line from the filehandle and store it into the SV, optionally appending to the currently-stored string. =cut */ char * Perl_sv_gets(pTHX_ register SV *sv, register PerlIO *fp, I32 append) { dVAR; const char *rsptr; STRLEN rslen; register STDCHAR rslast; register STDCHAR *bp; register I32 cnt; I32 i = 0; I32 rspara = 0; if (SvTHINKFIRST(sv)) sv_force_normal_flags(sv, append ? 0 : SV_COW_DROP_PV); /* XXX. If you make this PVIV, then copy on write can copy scalars read from <>. However, perlbench says it's slower, because the existing swipe code is faster than copy on write. Swings and roundabouts. */ SvUPGRADE(sv, SVt_PV); SvSCREAM_off(sv); if (append) { if (PerlIO_isutf8(fp)) { if (!SvUTF8(sv)) { sv_utf8_upgrade_nomg(sv); sv_pos_u2b(sv,&append,0); } } else if (SvUTF8(sv)) { SV * const tsv = newSV(0); sv_gets(tsv, fp, 0); sv_utf8_upgrade_nomg(tsv); SvCUR_set(sv,append); sv_catsv(sv,tsv); sv_free(tsv); goto return_string_or_null; } } SvPOK_only(sv); if (PerlIO_isutf8(fp)) SvUTF8_on(sv); if (IN_PERL_COMPILETIME) { /* we always read code in line mode */ rsptr = "\n"; rslen = 1; } else if (RsSNARF(PL_rs)) { /* If it is a regular disk file use size from stat() as estimate of amount we are going to read -- may result in mallocing more memory than we really need if the layers below reduce the size we read (e.g. CRLF or a gzip layer). */ Stat_t st; if (!PerlLIO_fstat(PerlIO_fileno(fp), &st) && S_ISREG(st.st_mode)) { const Off_t offset = PerlIO_tell(fp); if (offset != (Off_t) -1 && st.st_size + append > offset) { (void) SvGROW(sv, (STRLEN)((st.st_size - offset) + append + 1)); } } rsptr = NULL; rslen = 0; } else if (RsRECORD(PL_rs)) { I32 bytesread; char *buffer; U32 recsize; /* Grab the size of the record we're getting */ recsize = SvUV(SvRV(PL_rs)); /* RsRECORD() guarantees > 0. */ buffer = SvGROW(sv, (STRLEN)(recsize + append + 1)) + append; /* Go yank in */ #ifdef VMS /* VMS wants read instead of fread, because fread doesn't respect */ /* RMS record boundaries. This is not necessarily a good thing to be */ /* doing, but we've got no other real choice - except avoid stdio as implementation - perhaps write a :vms layer ? */ bytesread = PerlLIO_read(PerlIO_fileno(fp), buffer, recsize); #else bytesread = PerlIO_read(fp, buffer, recsize); #endif if (bytesread < 0) bytesread = 0; SvCUR_set(sv, bytesread += append); buffer[bytesread] = '\0'; goto return_string_or_null; } else if (RsPARA(PL_rs)) { rsptr = "\n\n"; rslen = 2; rspara = 1; } else { /* Get $/ i.e. PL_rs into same encoding as stream wants */ if (PerlIO_isutf8(fp)) { rsptr = SvPVutf8(PL_rs, rslen); } else { if (SvUTF8(PL_rs)) { if (!sv_utf8_downgrade(PL_rs, TRUE)) { Perl_croak(aTHX_ "Wide character in $/"); } } rsptr = SvPV_const(PL_rs, rslen); } } rslast = rslen ? rsptr[rslen - 1] : '\0'; if (rspara) { /* have to do this both before and after */ do { /* to make sure file boundaries work right */ if (PerlIO_eof(fp)) return 0; i = PerlIO_getc(fp); if (i != '\n') { if (i == -1) return 0; PerlIO_ungetc(fp,i); break; } } while (i != EOF); } /* See if we know enough about I/O mechanism to cheat it ! */ /* This used to be #ifdef test - it is made run-time test for ease of abstracting out stdio interface. One call should be cheap enough here - and may even be a macro allowing compile time optimization. */ if (PerlIO_fast_gets(fp)) { /* * We're going to steal some values from the stdio struct * and put EVERYTHING in the innermost loop into registers. */ register STDCHAR *ptr; STRLEN bpx; I32 shortbuffered; #if defined(VMS) && defined(PERLIO_IS_STDIO) /* An ungetc()d char is handled separately from the regular * buffer, so we getc() it back out and stuff it in the buffer. */ i = PerlIO_getc(fp); if (i == EOF) return 0; *(--((*fp)->_ptr)) = (unsigned char) i; (*fp)->_cnt++; #endif /* Here is some breathtakingly efficient cheating */ cnt = PerlIO_get_cnt(fp); /* get count into register */ /* make sure we have the room */ if ((I32)(SvLEN(sv) - append) <= cnt + 1) { /* Not room for all of it if we are looking for a separator and room for some */ if (rslen && cnt > 80 && (I32)SvLEN(sv) > append) { /* just process what we have room for */ shortbuffered = cnt - SvLEN(sv) + append + 1; cnt -= shortbuffered; } else { shortbuffered = 0; /* remember that cnt can be negative */ SvGROW(sv, (STRLEN)(append + (cnt <= 0 ? 2 : (cnt + 1)))); } } else shortbuffered = 0; bp = (STDCHAR*)SvPVX_const(sv) + append; /* move these two too to registers */ ptr = (STDCHAR*)PerlIO_get_ptr(fp); DEBUG_P(PerlIO_printf(Perl_debug_log, "Screamer: entering, ptr=%"UVuf", cnt=%ld\n",PTR2UV(ptr),(long)cnt)); DEBUG_P(PerlIO_printf(Perl_debug_log, "Screamer: entering: PerlIO * thinks ptr=%"UVuf", cnt=%ld, base=%"UVuf"\n", PTR2UV(PerlIO_get_ptr(fp)), (long)PerlIO_get_cnt(fp), PTR2UV(PerlIO_has_base(fp) ? PerlIO_get_base(fp) : 0))); for (;;) { screamer: if (cnt > 0) { if (rslen) { while (cnt > 0) { /* this | eat */ cnt--; if ((*bp++ = *ptr++) == rslast) /* really | dust */ goto thats_all_folks; /* screams | sed :-) */ } } else { Copy(ptr, bp, cnt, char); /* this | eat */ bp += cnt; /* screams | dust */ ptr += cnt; /* louder | sed :-) */ cnt = 0; } } if (shortbuffered) { /* oh well, must extend */ cnt = shortbuffered; shortbuffered = 0; bpx = bp - (STDCHAR*)SvPVX_const(sv); /* box up before relocation */ SvCUR_set(sv, bpx); SvGROW(sv, SvLEN(sv) + append + cnt + 2); bp = (STDCHAR*)SvPVX_const(sv) + bpx; /* unbox after relocation */ continue; } DEBUG_P(PerlIO_printf(Perl_debug_log, "Screamer: going to getc, ptr=%"UVuf", cnt=%ld\n", PTR2UV(ptr),(long)cnt)); PerlIO_set_ptrcnt(fp, (STDCHAR*)ptr, cnt); /* deregisterize cnt and ptr */ #if 0 DEBUG_P(PerlIO_printf(Perl_debug_log, "Screamer: pre: FILE * thinks ptr=%"UVuf", cnt=%ld, base=%"UVuf"\n", PTR2UV(PerlIO_get_ptr(fp)), (long)PerlIO_get_cnt(fp), PTR2UV(PerlIO_has_base (fp) ? PerlIO_get_base(fp) : 0))); #endif /* This used to call 'filbuf' in stdio form, but as that behaves like getc when cnt <= 0 we use PerlIO_getc here to avoid introducing another abstraction. */ i = PerlIO_getc(fp); /* get more characters */ #if 0 DEBUG_P(PerlIO_printf(Perl_debug_log, "Screamer: post: FILE * thinks ptr=%"UVuf", cnt=%ld, base=%"UVuf"\n", PTR2UV(PerlIO_get_ptr(fp)), (long)PerlIO_get_cnt(fp), PTR2UV(PerlIO_has_base (fp) ? PerlIO_get_base(fp) : 0))); #endif cnt = PerlIO_get_cnt(fp); ptr = (STDCHAR*)PerlIO_get_ptr(fp); /* reregisterize cnt and ptr */ DEBUG_P(PerlIO_printf(Perl_debug_log, "Screamer: after getc, ptr=%"UVuf", cnt=%ld\n",PTR2UV(ptr),(long)cnt)); if (i == EOF) /* all done for ever? */ goto thats_really_all_folks; bpx = bp - (STDCHAR*)SvPVX_const(sv); /* box up before relocation */ SvCUR_set(sv, bpx); SvGROW(sv, bpx + cnt + 2); bp = (STDCHAR*)SvPVX_const(sv) + bpx; /* unbox after relocation */ *bp++ = (STDCHAR)i; /* store character from PerlIO_getc */ if (rslen && (STDCHAR)i == rslast) /* all done for now? */ goto thats_all_folks; } thats_all_folks: if ((rslen > 1 && (STRLEN)(bp - (STDCHAR*)SvPVX_const(sv)) < rslen) || memNE((char*)bp - rslen, rsptr, rslen)) goto screamer; /* go back to the fray */ thats_really_all_folks: if (shortbuffered) cnt += shortbuffered; DEBUG_P(PerlIO_printf(Perl_debug_log, "Screamer: quitting, ptr=%"UVuf", cnt=%ld\n",PTR2UV(ptr),(long)cnt)); PerlIO_set_ptrcnt(fp, (STDCHAR*)ptr, cnt); /* put these back or we're in trouble */ DEBUG_P(PerlIO_printf(Perl_debug_log, "Screamer: end: FILE * thinks ptr=%"UVuf", cnt=%ld, base=%"UVuf"\n", PTR2UV(PerlIO_get_ptr(fp)), (long)PerlIO_get_cnt(fp), PTR2UV(PerlIO_has_base (fp) ? PerlIO_get_base(fp) : 0))); *bp = '\0'; SvCUR_set(sv, bp - (STDCHAR*)SvPVX_const(sv)); /* set length */ DEBUG_P(PerlIO_printf(Perl_debug_log, "Screamer: done, len=%ld, string=|%.*s|\n", (long)SvCUR(sv),(int)SvCUR(sv),SvPVX_const(sv))); } else { /*The big, slow, and stupid way. */ #ifdef USE_HEAP_INSTEAD_OF_STACK /* Even slower way. */ STDCHAR *buf = NULL; Newx(buf, 8192, STDCHAR); assert(buf); #else STDCHAR buf[8192]; #endif screamer2: if (rslen) { register const STDCHAR * const bpe = buf + sizeof(buf); bp = buf; while ((i = PerlIO_getc(fp)) != EOF && (*bp++ = (STDCHAR)i) != rslast && bp < bpe) ; /* keep reading */ cnt = bp - buf; } else { cnt = PerlIO_read(fp,(char*)buf, sizeof(buf)); /* Accomodate broken VAXC compiler, which applies U8 cast to * both args of ?: operator, causing EOF to change into 255 */ if (cnt > 0) i = (U8)buf[cnt - 1]; else i = EOF; } if (cnt < 0) cnt = 0; /* we do need to re-set the sv even when cnt <= 0 */ if (append) sv_catpvn(sv, (char *) buf, cnt); else sv_setpvn(sv, (char *) buf, cnt); if (i != EOF && /* joy */ (!rslen || SvCUR(sv) < rslen || memNE(SvPVX_const(sv) + SvCUR(sv) - rslen, rsptr, rslen))) { append = -1; /* * If we're reading from a TTY and we get a short read, * indicating that the user hit his EOF character, we need * to notice it now, because if we try to read from the TTY * again, the EOF condition will disappear. * * The comparison of cnt to sizeof(buf) is an optimization * that prevents unnecessary calls to feof(). * * - jik 9/25/96 */ if (!(cnt < (I32)sizeof(buf) && PerlIO_eof(fp))) goto screamer2; } #ifdef USE_HEAP_INSTEAD_OF_STACK Safefree(buf); #endif } if (rspara) { /* have to do this both before and after */ while (i != EOF) { /* to make sure file boundaries work right */ i = PerlIO_getc(fp); if (i != '\n') { PerlIO_ungetc(fp,i); break; } } } return_string_or_null: return (SvCUR(sv) - append) ? SvPVX(sv) : NULL; } /* =for apidoc sv_inc Auto-increment of the value in the SV, doing string to numeric conversion if necessary. Handles 'get' magic. =cut */ void Perl_sv_inc(pTHX_ register SV *sv) { dVAR; register char *d; int flags; if (!sv) return; SvGETMAGIC(sv); if (SvTHINKFIRST(sv)) { if (SvIsCOW(sv)) sv_force_normal_flags(sv, 0); if (SvREADONLY(sv)) { if (IN_PERL_RUNTIME) Perl_croak(aTHX_ PL_no_modify); } if (SvROK(sv)) { IV i; if (SvAMAGIC(sv) && AMG_CALLun(sv,inc)) return; i = PTR2IV(SvRV(sv)); sv_unref(sv); sv_setiv(sv, i); } } flags = SvFLAGS(sv); if ((flags & (SVp_NOK|SVp_IOK)) == SVp_NOK) { /* It's (privately or publicly) a float, but not tested as an integer, so test it to see. */ (void) SvIV(sv); flags = SvFLAGS(sv); } if ((flags & SVf_IOK) || ((flags & (SVp_IOK | SVp_NOK)) == SVp_IOK)) { /* It's publicly an integer, or privately an integer-not-float */ #ifdef PERL_PRESERVE_IVUV oops_its_int: #endif if (SvIsUV(sv)) { if (SvUVX(sv) == UV_MAX) sv_setnv(sv, UV_MAX_P1); else (void)SvIOK_only_UV(sv); SvUV_set(sv, SvUVX(sv) + 1); } else { if (SvIVX(sv) == IV_MAX) sv_setuv(sv, (UV)IV_MAX + 1); else { (void)SvIOK_only(sv); SvIV_set(sv, SvIVX(sv) + 1); } } return; } if (flags & SVp_NOK) { (void)SvNOK_only(sv); SvNV_set(sv, SvNVX(sv) + 1.0); return; } if (!(flags & SVp_POK) || !*SvPVX_const(sv)) { if ((flags & SVTYPEMASK) < SVt_PVIV) sv_upgrade(sv, ((flags & SVTYPEMASK) > SVt_IV ? SVt_PVIV : SVt_IV)); (void)SvIOK_only(sv); SvIV_set(sv, 1); return; } d = SvPVX(sv); while (isALPHA(*d)) d++; while (isDIGIT(*d)) d++; if (*d) { #ifdef PERL_PRESERVE_IVUV /* Got to punt this as an integer if needs be, but we don't issue warnings. Probably ought to make the sv_iv_please() that does the conversion if possible, and silently. */ const int numtype = grok_number(SvPVX_const(sv), SvCUR(sv), NULL); if (numtype && !(numtype & IS_NUMBER_INFINITY)) { /* Need to try really hard to see if it's an integer. 9.22337203685478e+18 is an integer. but "9.22337203685478e+18" + 0 is UV=9223372036854779904 so $a="9.22337203685478e+18"; $a+0; $a++ needs to be the same as $a="9.22337203685478e+18"; $a++ or we go insane. */ (void) sv_2iv(sv); if (SvIOK(sv)) goto oops_its_int; /* sv_2iv *should* have made this an NV */ if (flags & SVp_NOK) { (void)SvNOK_only(sv); SvNV_set(sv, SvNVX(sv) + 1.0); return; } /* I don't think we can get here. Maybe I should assert this And if we do get here I suspect that sv_setnv will croak. NWC Fall through. */ #if defined(USE_LONG_DOUBLE) DEBUG_c(PerlIO_printf(Perl_debug_log,"sv_inc punt failed to convert '%s' to IOK or NOKp, UV=0x%"UVxf" NV=%"PERL_PRIgldbl"\n", SvPVX_const(sv), SvIVX(sv), SvNVX(sv))); #else DEBUG_c(PerlIO_printf(Perl_debug_log,"sv_inc punt failed to convert '%s' to IOK or NOKp, UV=0x%"UVxf" NV=%"NVgf"\n", SvPVX_const(sv), SvIVX(sv), SvNVX(sv))); #endif } #endif /* PERL_PRESERVE_IVUV */ sv_setnv(sv,Atof(SvPVX_const(sv)) + 1.0); return; } d--; while (d >= SvPVX_const(sv)) { if (isDIGIT(*d)) { if (++*d <= '9') return; *(d--) = '0'; } else { #ifdef EBCDIC /* MKS: The original code here died if letters weren't consecutive. * at least it didn't have to worry about non-C locales. The * new code assumes that ('z'-'a')==('Z'-'A'), letters are * arranged in order (although not consecutively) and that only * [A-Za-z] are accepted by isALPHA in the C locale. */ if (*d != 'z' && *d != 'Z') { do { ++*d; } while (!isALPHA(*d)); return; } *(d--) -= 'z' - 'a'; #else ++*d; if (isALPHA(*d)) return; *(d--) -= 'z' - 'a' + 1; #endif } } /* oh,oh, the number grew */ SvGROW(sv, SvCUR(sv) + 2); SvCUR_set(sv, SvCUR(sv) + 1); for (d = SvPVX(sv) + SvCUR(sv); d > SvPVX_const(sv); d--) *d = d[-1]; if (isDIGIT(d[1])) *d = '1'; else *d = d[1]; } /* =for apidoc sv_dec Auto-decrement of the value in the SV, doing string to numeric conversion if necessary. Handles 'get' magic. =cut */ void Perl_sv_dec(pTHX_ register SV *sv) { dVAR; int flags; if (!sv) return; SvGETMAGIC(sv); if (SvTHINKFIRST(sv)) { if (SvIsCOW(sv)) sv_force_normal_flags(sv, 0); if (SvREADONLY(sv)) { if (IN_PERL_RUNTIME) Perl_croak(aTHX_ PL_no_modify); } if (SvROK(sv)) { IV i; if (SvAMAGIC(sv) && AMG_CALLun(sv,dec)) return; i = PTR2IV(SvRV(sv)); sv_unref(sv); sv_setiv(sv, i); } } /* Unlike sv_inc we don't have to worry about string-never-numbers and keeping them magic. But we mustn't warn on punting */ flags = SvFLAGS(sv); if ((flags & SVf_IOK) || ((flags & (SVp_IOK | SVp_NOK)) == SVp_IOK)) { /* It's publicly an integer, or privately an integer-not-float */ #ifdef PERL_PRESERVE_IVUV oops_its_int: #endif if (SvIsUV(sv)) { if (SvUVX(sv) == 0) { (void)SvIOK_only(sv); SvIV_set(sv, -1); } else { (void)SvIOK_only_UV(sv); SvUV_set(sv, SvUVX(sv) - 1); } } else { if (SvIVX(sv) == IV_MIN) sv_setnv(sv, (NV)IV_MIN - 1.0); else { (void)SvIOK_only(sv); SvIV_set(sv, SvIVX(sv) - 1); } } return; } if (flags & SVp_NOK) { SvNV_set(sv, SvNVX(sv) - 1.0); (void)SvNOK_only(sv); return; } if (!(flags & SVp_POK)) { if ((flags & SVTYPEMASK) < SVt_PVIV) sv_upgrade(sv, ((flags & SVTYPEMASK) > SVt_IV) ? SVt_PVIV : SVt_IV); SvIV_set(sv, -1); (void)SvIOK_only(sv); return; } #ifdef PERL_PRESERVE_IVUV { const int numtype = grok_number(SvPVX_const(sv), SvCUR(sv), NULL); if (numtype && !(numtype & IS_NUMBER_INFINITY)) { /* Need to try really hard to see if it's an integer. 9.22337203685478e+18 is an integer. but "9.22337203685478e+18" + 0 is UV=9223372036854779904 so $a="9.22337203685478e+18"; $a+0; $a-- needs to be the same as $a="9.22337203685478e+18"; $a-- or we go insane. */ (void) sv_2iv(sv); if (SvIOK(sv)) goto oops_its_int; /* sv_2iv *should* have made this an NV */ if (flags & SVp_NOK) { (void)SvNOK_only(sv); SvNV_set(sv, SvNVX(sv) - 1.0); return; } /* I don't think we can get here. Maybe I should assert this And if we do get here I suspect that sv_setnv will croak. NWC Fall through. */ #if defined(USE_LONG_DOUBLE) DEBUG_c(PerlIO_printf(Perl_debug_log,"sv_dec punt failed to convert '%s' to IOK or NOKp, UV=0x%"UVxf" NV=%"PERL_PRIgldbl"\n", SvPVX_const(sv), SvIVX(sv), SvNVX(sv))); #else DEBUG_c(PerlIO_printf(Perl_debug_log,"sv_dec punt failed to convert '%s' to IOK or NOKp, UV=0x%"UVxf" NV=%"NVgf"\n", SvPVX_const(sv), SvIVX(sv), SvNVX(sv))); #endif } } #endif /* PERL_PRESERVE_IVUV */ sv_setnv(sv,Atof(SvPVX_const(sv)) - 1.0); /* punt */ } /* =for apidoc sv_mortalcopy Creates a new SV which is a copy of the original SV (using C). The new SV is marked as mortal. It will be destroyed "soon", either by an explicit call to FREETMPS, or by an implicit call at places such as statement boundaries. See also C and C. =cut */ /* Make a string that will exist for the duration of the expression * evaluation. Actually, it may have to last longer than that, but * hopefully we won't free it until it has been assigned to a * permanent location. */ SV * Perl_sv_mortalcopy(pTHX_ SV *oldstr) { dVAR; register SV *sv; new_SV(sv); sv_setsv(sv,oldstr); EXTEND_MORTAL(1); PL_tmps_stack[++PL_tmps_ix] = sv; SvTEMP_on(sv); return sv; } /* =for apidoc sv_newmortal Creates a new null SV which is mortal. The reference count of the SV is set to 1. It will be destroyed "soon", either by an explicit call to FREETMPS, or by an implicit call at places such as statement boundaries. See also C and C. =cut */ SV * Perl_sv_newmortal(pTHX) { dVAR; register SV *sv; new_SV(sv); SvFLAGS(sv) = SVs_TEMP; EXTEND_MORTAL(1); PL_tmps_stack[++PL_tmps_ix] = sv; return sv; } /* =for apidoc sv_2mortal Marks an existing SV as mortal. The SV will be destroyed "soon", either by an explicit call to FREETMPS, or by an implicit call at places such as statement boundaries. SvTEMP() is turned on which means that the SV's string buffer can be "stolen" if this SV is copied. See also C and C. =cut */ SV * Perl_sv_2mortal(pTHX_ register SV *sv) { dVAR; if (!sv) return NULL; if (SvREADONLY(sv) && SvIMMORTAL(sv)) return sv; EXTEND_MORTAL(1); PL_tmps_stack[++PL_tmps_ix] = sv; SvTEMP_on(sv); return sv; } /* =for apidoc newSVpv Creates a new SV and copies a string into it. The reference count for the SV is set to 1. If C is zero, Perl will compute the length using strlen(). For efficiency, consider using C instead. =cut */ SV * Perl_newSVpv(pTHX_ const char *s, STRLEN len) { dVAR; register SV *sv; new_SV(sv); sv_setpvn(sv, s, len || s == NULL ? len : strlen(s)); return sv; } /* =for apidoc newSVpvn Creates a new SV and copies a string into it. The reference count for the SV is set to 1. Note that if C is zero, Perl will create a zero length string. You are responsible for ensuring that the source string is at least C bytes long. If the C argument is NULL the new SV will be undefined. =cut */ SV * Perl_newSVpvn(pTHX_ const char *s, STRLEN len) { dVAR; register SV *sv; new_SV(sv); sv_setpvn(sv,s,len); return sv; } /* =for apidoc newSVhek Creates a new SV from the hash key structure. It will generate scalars that point to the shared string table where possible. Returns a new (undefined) SV if the hek is NULL. =cut */ SV * Perl_newSVhek(pTHX_ const HEK *hek) { dVAR; if (!hek) { SV *sv; new_SV(sv); return sv; } if (HEK_LEN(hek) == HEf_SVKEY) { return newSVsv(*(SV**)HEK_KEY(hek)); } else { const int flags = HEK_FLAGS(hek); if (flags & HVhek_WASUTF8) { /* Trouble :-) Andreas would like keys he put in as utf8 to come back as utf8 */ STRLEN utf8_len = HEK_LEN(hek); const U8 *as_utf8 = bytes_to_utf8 ((U8*)HEK_KEY(hek), &utf8_len); SV * const sv = newSVpvn ((const char*)as_utf8, utf8_len); SvUTF8_on (sv); Safefree (as_utf8); /* bytes_to_utf8() allocates a new string */ return sv; } else if (flags & (HVhek_REHASH|HVhek_UNSHARED)) { /* We don't have a pointer to the hv, so we have to replicate the flag into every HEK. This hv is using custom a hasing algorithm. Hence we can't return a shared string scalar, as that would contain the (wrong) hash value, and might get passed into an hv routine with a regular hash. Similarly, a hash that isn't using shared hash keys has to have the flag in every key so that we know not to try to call share_hek_kek on it. */ SV * const sv = newSVpvn (HEK_KEY(hek), HEK_LEN(hek)); if (HEK_UTF8(hek)) SvUTF8_on (sv); return sv; } /* This will be overwhelminly the most common case. */ { /* Inline most of newSVpvn_share(), because share_hek_hek() is far more efficient than sharepvn(). */ SV *sv; new_SV(sv); sv_upgrade(sv, SVt_PV); SvPV_set(sv, (char *)HEK_KEY(share_hek_hek(hek))); SvCUR_set(sv, HEK_LEN(hek)); SvLEN_set(sv, 0); SvREADONLY_on(sv); SvFAKE_on(sv); SvPOK_on(sv); if (HEK_UTF8(hek)) SvUTF8_on(sv); return sv; } } } /* =for apidoc newSVpvn_share Creates a new SV with its SvPVX_const pointing to a shared string in the string table. If the string does not already exist in the table, it is created first. Turns on READONLY and FAKE. The string's hash is stored in the UV slot of the SV; if the C parameter is non-zero, that value is used; otherwise the hash is computed. The idea here is that as the string table is used for shared hash keys these strings will have SvPVX_const == HeKEY and hash lookup will avoid string compare. =cut */ SV * Perl_newSVpvn_share(pTHX_ const char *src, I32 len, U32 hash) { dVAR; register SV *sv; bool is_utf8 = FALSE; const char *const orig_src = src; if (len < 0) { STRLEN tmplen = -len; is_utf8 = TRUE; /* See the note in hv.c:hv_fetch() --jhi */ src = (char*)bytes_from_utf8((const U8*)src, &tmplen, &is_utf8); len = tmplen; } if (!hash) PERL_HASH(hash, src, len); new_SV(sv); sv_upgrade(sv, SVt_PV); SvPV_set(sv, sharepvn(src, is_utf8?-len:len, hash)); SvCUR_set(sv, len); SvLEN_set(sv, 0); SvREADONLY_on(sv); SvFAKE_on(sv); SvPOK_on(sv); if (is_utf8) SvUTF8_on(sv); if (src != orig_src) Safefree(src); return sv; } #if defined(PERL_IMPLICIT_CONTEXT) /* pTHX_ magic can't cope with varargs, so this is a no-context * version of the main function, (which may itself be aliased to us). * Don't access this version directly. */ SV * Perl_newSVpvf_nocontext(const char* pat, ...) { dTHX; register SV *sv; va_list args; va_start(args, pat); sv = vnewSVpvf(pat, &args); va_end(args); return sv; } #endif /* =for apidoc newSVpvf Creates a new SV and initializes it with the string formatted like C. =cut */ SV * Perl_newSVpvf(pTHX_ const char* pat, ...) { register SV *sv; va_list args; va_start(args, pat); sv = vnewSVpvf(pat, &args); va_end(args); return sv; } /* backend for newSVpvf() and newSVpvf_nocontext() */ SV * Perl_vnewSVpvf(pTHX_ const char* pat, va_list* args) { dVAR; register SV *sv; new_SV(sv); sv_vsetpvfn(sv, pat, strlen(pat), args, NULL, 0, NULL); return sv; } /* =for apidoc newSVnv Creates a new SV and copies a floating point value into it. The reference count for the SV is set to 1. =cut */ SV * Perl_newSVnv(pTHX_ NV n) { dVAR; register SV *sv; new_SV(sv); sv_setnv(sv,n); return sv; } /* =for apidoc newSViv Creates a new SV and copies an integer into it. The reference count for the SV is set to 1. =cut */ SV * Perl_newSViv(pTHX_ IV i) { dVAR; register SV *sv; new_SV(sv); sv_setiv(sv,i); return sv; } /* =for apidoc newSVuv Creates a new SV and copies an unsigned integer into it. The reference count for the SV is set to 1. =cut */ SV * Perl_newSVuv(pTHX_ UV u) { dVAR; register SV *sv; new_SV(sv); sv_setuv(sv,u); return sv; } /* =for apidoc newRV_noinc Creates an RV wrapper for an SV. The reference count for the original SV is B incremented. =cut */ SV * Perl_newRV_noinc(pTHX_ SV *tmpRef) { dVAR; register SV *sv; new_SV(sv); sv_upgrade(sv, SVt_RV); SvTEMP_off(tmpRef); SvRV_set(sv, tmpRef); SvROK_on(sv); return sv; } /* newRV_inc is the official function name to use now. * newRV_inc is in fact #defined to newRV in sv.h */ SV * Perl_newRV(pTHX_ SV *sv) { dVAR; return newRV_noinc(SvREFCNT_inc_simple_NN(sv)); } /* =for apidoc newSVsv Creates a new SV which is an exact duplicate of the original SV. (Uses C). =cut */ SV * Perl_newSVsv(pTHX_ register SV *old) { dVAR; register SV *sv; if (!old) return NULL; if (SvTYPE(old) == SVTYPEMASK) { if (ckWARN_d(WARN_INTERNAL)) Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "semi-panic: attempt to dup freed string"); return NULL; } new_SV(sv); /* SV_GMAGIC is the default for sv_setv() SV_NOSTEAL prevents TEMP buffers being, well, stolen, and saves games with SvTEMP_off and SvTEMP_on round a call to sv_setsv. */ sv_setsv_flags(sv, old, SV_GMAGIC | SV_NOSTEAL); return sv; } /* =for apidoc sv_reset Underlying implementation for the C Perl function. Note that the perl-level function is vaguely deprecated. =cut */ void Perl_sv_reset(pTHX_ register const char *s, HV *stash) { dVAR; char todo[PERL_UCHAR_MAX+1]; if (!stash) return; if (!*s) { /* reset ?? searches */ MAGIC * const mg = mg_find((SV *)stash, PERL_MAGIC_symtab); if (mg) { PMOP *pm = (PMOP *) mg->mg_obj; while (pm) { pm->op_pmdynflags &= ~PMdf_USED; pm = pm->op_pmnext; } } return; } /* reset variables */ if (!HvARRAY(stash)) return; Zero(todo, 256, char); while (*s) { I32 max; I32 i = (unsigned char)*s; if (s[1] == '-') { s += 2; } max = (unsigned char)*s++; for ( ; i <= max; i++) { todo[i] = 1; } for (i = 0; i <= (I32) HvMAX(stash); i++) { HE *entry; for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) { register GV *gv; register SV *sv; if (!todo[(U8)*HeKEY(entry)]) continue; gv = (GV*)HeVAL(entry); sv = GvSV(gv); if (sv) { if (SvTHINKFIRST(sv)) { if (!SvREADONLY(sv) && SvROK(sv)) sv_unref(sv); /* XXX Is this continue a bug? Why should THINKFIRST exempt us from resetting arrays and hashes? */ continue; } SvOK_off(sv); if (SvTYPE(sv) >= SVt_PV) { SvCUR_set(sv, 0); if (SvPVX_const(sv) != NULL) *SvPVX(sv) = '\0'; SvTAINT(sv); } } if (GvAV(gv)) { av_clear(GvAV(gv)); } if (GvHV(gv) && !HvNAME_get(GvHV(gv))) { #if defined(VMS) Perl_die(aTHX_ "Can't reset %%ENV on this system"); #else /* ! VMS */ hv_clear(GvHV(gv)); # if defined(USE_ENVIRON_ARRAY) if (gv == PL_envgv) my_clearenv(); # endif /* USE_ENVIRON_ARRAY */ #endif /* VMS */ } } } } } /* =for apidoc sv_2io Using various gambits, try to get an IO from an SV: the IO slot if its a GV; or the recursive result if we're an RV; or the IO slot of the symbol named after the PV if we're a string. =cut */ IO* Perl_sv_2io(pTHX_ SV *sv) { IO* io; GV* gv; switch (SvTYPE(sv)) { case SVt_PVIO: io = (IO*)sv; break; case SVt_PVGV: gv = (GV*)sv; io = GvIO(gv); if (!io) Perl_croak(aTHX_ "Bad filehandle: %s", GvNAME(gv)); break; default: if (!SvOK(sv)) Perl_croak(aTHX_ PL_no_usym, "filehandle"); if (SvROK(sv)) return sv_2io(SvRV(sv)); gv = gv_fetchsv(sv, 0, SVt_PVIO); if (gv) io = GvIO(gv); else io = 0; if (!io) Perl_croak(aTHX_ "Bad filehandle: %"SVf, (void*)sv); break; } return io; } /* =for apidoc sv_2cv Using various gambits, try to get a CV from an SV; in addition, try if possible to set C<*st> and C<*gvp> to the stash and GV associated with it. The flags in C are passed to sv_fetchsv. =cut */ CV * Perl_sv_2cv(pTHX_ SV *sv, HV **st, GV **gvp, I32 lref) { dVAR; GV *gv = NULL; CV *cv = NULL; if (!sv) { *st = NULL; *gvp = NULL; return NULL; } switch (SvTYPE(sv)) { case SVt_PVCV: *st = CvSTASH(sv); *gvp = NULL; return (CV*)sv; case SVt_PVHV: case SVt_PVAV: *st = NULL; *gvp = NULL; return NULL; case SVt_PVGV: gv = (GV*)sv; *gvp = gv; *st = GvESTASH(gv); goto fix_gv; default: SvGETMAGIC(sv); if (SvROK(sv)) { SV * const *sp = &sv; /* Used in tryAMAGICunDEREF macro. */ tryAMAGICunDEREF(to_cv); sv = SvRV(sv); if (SvTYPE(sv) == SVt_PVCV) { cv = (CV*)sv; *gvp = NULL; *st = CvSTASH(cv); return cv; } else if(isGV(sv)) gv = (GV*)sv; else Perl_croak(aTHX_ "Not a subroutine reference"); } else if (isGV(sv)) gv = (GV*)sv; else gv = gv_fetchsv(sv, lref, SVt_PVCV); *gvp = gv; if (!gv) { *st = NULL; return NULL; } /* Some flags to gv_fetchsv mean don't really create the GV */ if (SvTYPE(gv) != SVt_PVGV) { *st = NULL; return NULL; } *st = GvESTASH(gv); fix_gv: if (lref && !GvCVu(gv)) { SV *tmpsv; ENTER; tmpsv = newSV(0); gv_efullname3(tmpsv, gv, NULL); /* XXX this is probably not what they think they're getting. * It has the same effect as "sub name;", i.e. just a forward * declaration! */ newSUB(start_subparse(FALSE, 0), newSVOP(OP_CONST, 0, tmpsv), NULL, NULL); LEAVE; if (!GvCVu(gv)) Perl_croak(aTHX_ "Unable to create sub named \"%"SVf"\"", (void*)sv); } return GvCVu(gv); } } /* =for apidoc sv_true Returns true if the SV has a true value by Perl's rules. Use the C macro instead, which may call C or may instead use an in-line version. =cut */ I32 Perl_sv_true(pTHX_ register SV *sv) { if (!sv) return 0; if (SvPOK(sv)) { register const XPV* const tXpv = (XPV*)SvANY(sv); if (tXpv && (tXpv->xpv_cur > 1 || (tXpv->xpv_cur && *sv->sv_u.svu_pv != '0'))) return 1; else return 0; } else { if (SvIOK(sv)) return SvIVX(sv) != 0; else { if (SvNOK(sv)) return SvNVX(sv) != 0.0; else return sv_2bool(sv); } } } /* =for apidoc sv_pvn_force Get a sensible string out of the SV somehow. A private implementation of the C macro for compilers which can't cope with complex macro expressions. Always use the macro instead. =for apidoc sv_pvn_force_flags Get a sensible string out of the SV somehow. If C has C bit set, will C on C if appropriate, else not. C and C are implemented in terms of this function. You normally want to use the various wrapper macros instead: see C and C =cut */ char * Perl_sv_pvn_force_flags(pTHX_ SV *sv, STRLEN *lp, I32 flags) { dVAR; if (SvTHINKFIRST(sv) && !SvROK(sv)) sv_force_normal_flags(sv, 0); if (SvPOK(sv)) { if (lp) *lp = SvCUR(sv); } else { char *s; STRLEN len; if (SvREADONLY(sv) && !(flags & SV_MUTABLE_RETURN)) { const char * const ref = sv_reftype(sv,0); if (PL_op) Perl_croak(aTHX_ "Can't coerce readonly %s to string in %s", ref, OP_NAME(PL_op)); else Perl_croak(aTHX_ "Can't coerce readonly %s to string", ref); } if (SvTYPE(sv) > SVt_PVLV && SvTYPE(sv) != SVt_PVFM) Perl_croak(aTHX_ "Can't coerce %s to string in %s", sv_reftype(sv,0), OP_NAME(PL_op)); s = sv_2pv_flags(sv, &len, flags); if (lp) *lp = len; if (s != SvPVX_const(sv)) { /* Almost, but not quite, sv_setpvn() */ if (SvROK(sv)) sv_unref(sv); SvUPGRADE(sv, SVt_PV); /* Never FALSE */ SvGROW(sv, len + 1); Move(s,SvPVX(sv),len,char); SvCUR_set(sv, len); *SvEND(sv) = '\0'; } if (!SvPOK(sv)) { SvPOK_on(sv); /* validate pointer */ SvTAINT(sv); DEBUG_c(PerlIO_printf(Perl_debug_log, "0x%"UVxf" 2pv(%s)\n", PTR2UV(sv),SvPVX_const(sv))); } } return SvPVX_mutable(sv); } /* =for apidoc sv_pvbyten_force The backend for the C macro. Always use the macro instead. =cut */ char * Perl_sv_pvbyten_force(pTHX_ SV *sv, STRLEN *lp) { sv_pvn_force(sv,lp); sv_utf8_downgrade(sv,0); *lp = SvCUR(sv); return SvPVX(sv); } /* =for apidoc sv_pvutf8n_force The backend for the C macro. Always use the macro instead. =cut */ char * Perl_sv_pvutf8n_force(pTHX_ SV *sv, STRLEN *lp) { sv_pvn_force(sv,lp); sv_utf8_upgrade(sv); *lp = SvCUR(sv); return SvPVX(sv); } /* =for apidoc sv_reftype Returns a string describing what the SV is a reference to. =cut */ const char * Perl_sv_reftype(pTHX_ const SV *sv, int ob) { /* The fact that I don't need to downcast to char * everywhere, only in ?: inside return suggests a const propagation bug in g++. */ if (ob && SvOBJECT(sv)) { char * const name = HvNAME_get(SvSTASH(sv)); return name ? name : (char *) "__ANON__"; } else { switch (SvTYPE(sv)) { case SVt_NULL: case SVt_IV: case SVt_NV: case SVt_RV: case SVt_PV: case SVt_PVIV: case SVt_PVNV: case SVt_PVMG: if (SvVOK(sv)) return "VSTRING"; if (SvROK(sv)) return "REF"; else return "SCALAR"; case SVt_PVLV: return (char *) (SvROK(sv) ? "REF" /* tied lvalues should appear to be * scalars for backwards compatitbility */ : (LvTYPE(sv) == 't' || LvTYPE(sv) == 'T') ? "SCALAR" : "LVALUE"); case SVt_PVAV: return "ARRAY"; case SVt_PVHV: return "HASH"; case SVt_PVCV: return "CODE"; case SVt_PVGV: return "GLOB"; case SVt_PVFM: return "FORMAT"; case SVt_PVIO: return "IO"; case SVt_BIND: return "BIND"; default: return "UNKNOWN"; } } } /* =for apidoc sv_isobject Returns a boolean indicating whether the SV is an RV pointing to a blessed object. If the SV is not an RV, or if the object is not blessed, then this will return false. =cut */ int Perl_sv_isobject(pTHX_ SV *sv) { if (!sv) return 0; SvGETMAGIC(sv); if (!SvROK(sv)) return 0; sv = (SV*)SvRV(sv); if (!SvOBJECT(sv)) return 0; return 1; } /* =for apidoc sv_isa Returns a boolean indicating whether the SV is blessed into the specified class. This does not check for subtypes; use C to verify an inheritance relationship. =cut */ int Perl_sv_isa(pTHX_ SV *sv, const char *name) { const char *hvname; if (!sv) return 0; SvGETMAGIC(sv); if (!SvROK(sv)) return 0; sv = (SV*)SvRV(sv); if (!SvOBJECT(sv)) return 0; hvname = HvNAME_get(SvSTASH(sv)); if (!hvname) return 0; return strEQ(hvname, name); } /* =for apidoc newSVrv Creates a new SV for the RV, C, to point to. If C is not an RV then it will be upgraded to one. If C is non-null then the new SV will be blessed in the specified package. The new SV is returned and its reference count is 1. =cut */ SV* Perl_newSVrv(pTHX_ SV *rv, const char *classname) { dVAR; SV *sv; new_SV(sv); SV_CHECK_THINKFIRST_COW_DROP(rv); SvAMAGIC_off(rv); if (SvTYPE(rv) >= SVt_PVMG) { const U32 refcnt = SvREFCNT(rv); SvREFCNT(rv) = 0; sv_clear(rv); SvFLAGS(rv) = 0; SvREFCNT(rv) = refcnt; sv_upgrade(rv, SVt_RV); } else if (SvROK(rv)) { SvREFCNT_dec(SvRV(rv)); } else if (SvTYPE(rv) < SVt_RV) sv_upgrade(rv, SVt_RV); else if (SvTYPE(rv) > SVt_RV) { SvPV_free(rv); SvCUR_set(rv, 0); SvLEN_set(rv, 0); } SvOK_off(rv); SvRV_set(rv, sv); SvROK_on(rv); if (classname) { HV* const stash = gv_stashpv(classname, TRUE); (void)sv_bless(rv, stash); } return sv; } /* =for apidoc sv_setref_pv Copies a pointer into a new SV, optionally blessing the SV. The C argument will be upgraded to an RV. That RV will be modified to point to the new SV. If the C argument is NULL then C will be placed into the SV. The C argument indicates the package for the blessing. Set C to C to avoid the blessing. The new SV will have a reference count of 1, and the RV will be returned. Do not use with other Perl types such as HV, AV, SV, CV, because those objects will become corrupted by the pointer copy process. Note that C copies the string while this copies the pointer. =cut */ SV* Perl_sv_setref_pv(pTHX_ SV *rv, const char *classname, void *pv) { dVAR; if (!pv) { sv_setsv(rv, &PL_sv_undef); SvSETMAGIC(rv); } else sv_setiv(newSVrv(rv,classname), PTR2IV(pv)); return rv; } /* =for apidoc sv_setref_iv Copies an integer into a new SV, optionally blessing the SV. The C argument will be upgraded to an RV. That RV will be modified to point to the new SV. The C argument indicates the package for the blessing. Set C to C to avoid the blessing. The new SV will have a reference count of 1, and the RV will be returned. =cut */ SV* Perl_sv_setref_iv(pTHX_ SV *rv, const char *classname, IV iv) { sv_setiv(newSVrv(rv,classname), iv); return rv; } /* =for apidoc sv_setref_uv Copies an unsigned integer into a new SV, optionally blessing the SV. The C argument will be upgraded to an RV. That RV will be modified to point to the new SV. The C argument indicates the package for the blessing. Set C to C to avoid the blessing. The new SV will have a reference count of 1, and the RV will be returned. =cut */ SV* Perl_sv_setref_uv(pTHX_ SV *rv, const char *classname, UV uv) { sv_setuv(newSVrv(rv,classname), uv); return rv; } /* =for apidoc sv_setref_nv Copies a double into a new SV, optionally blessing the SV. The C argument will be upgraded to an RV. That RV will be modified to point to the new SV. The C argument indicates the package for the blessing. Set C to C to avoid the blessing. The new SV will have a reference count of 1, and the RV will be returned. =cut */ SV* Perl_sv_setref_nv(pTHX_ SV *rv, const char *classname, NV nv) { sv_setnv(newSVrv(rv,classname), nv); return rv; } /* =for apidoc sv_setref_pvn Copies a string into a new SV, optionally blessing the SV. The length of the string must be specified with C. The C argument will be upgraded to an RV. That RV will be modified to point to the new SV. The C argument indicates the package for the blessing. Set C to C to avoid the blessing. The new SV will have a reference count of 1, and the RV will be returned. Note that C copies the pointer while this copies the string. =cut */ SV* Perl_sv_setref_pvn(pTHX_ SV *rv, const char *classname, const char *pv, STRLEN n) { sv_setpvn(newSVrv(rv,classname), pv, n); return rv; } /* =for apidoc sv_bless Blesses an SV into a specified package. The SV must be an RV. The package must be designated by its stash (see C). The reference count of the SV is unaffected. =cut */ SV* Perl_sv_bless(pTHX_ SV *sv, HV *stash) { dVAR; SV *tmpRef; if (!SvROK(sv)) Perl_croak(aTHX_ "Can't bless non-reference value"); tmpRef = SvRV(sv); if (SvFLAGS(tmpRef) & (SVs_OBJECT|SVf_READONLY)) { if (SvREADONLY(tmpRef)) Perl_croak(aTHX_ PL_no_modify); if (SvOBJECT(tmpRef)) { if (SvTYPE(tmpRef) != SVt_PVIO) --PL_sv_objcount; SvREFCNT_dec(SvSTASH(tmpRef)); } } SvOBJECT_on(tmpRef); if (SvTYPE(tmpRef) != SVt_PVIO) ++PL_sv_objcount; SvUPGRADE(tmpRef, SVt_PVMG); SvSTASH_set(tmpRef, (HV*)SvREFCNT_inc_simple(stash)); if (Gv_AMG(stash)) SvAMAGIC_on(sv); else SvAMAGIC_off(sv); if(SvSMAGICAL(tmpRef)) if(mg_find(tmpRef, PERL_MAGIC_ext) || mg_find(tmpRef, PERL_MAGIC_uvar)) mg_set(tmpRef); return sv; } /* Downgrades a PVGV to a PVMG. */ STATIC void S_sv_unglob(pTHX_ SV *sv) { dVAR; void *xpvmg; SV * const temp = sv_newmortal(); assert(SvTYPE(sv) == SVt_PVGV); SvFAKE_off(sv); gv_efullname3(temp, (GV *) sv, "*"); if (GvGP(sv)) { gp_free((GV*)sv); } if (GvSTASH(sv)) { sv_del_backref((SV*)GvSTASH(sv), sv); GvSTASH(sv) = NULL; } GvMULTI_off(sv); if (GvNAME_HEK(sv)) { unshare_hek(GvNAME_HEK(sv)); } isGV_with_GP_off(sv); /* need to keep SvANY(sv) in the right arena */ xpvmg = new_XPVMG(); StructCopy(SvANY(sv), xpvmg, XPVMG); del_XPVGV(SvANY(sv)); SvANY(sv) = xpvmg; SvFLAGS(sv) &= ~SVTYPEMASK; SvFLAGS(sv) |= SVt_PVMG; /* Intentionally not calling any local SET magic, as this isn't so much a set operation as merely an internal storage change. */ sv_setsv_flags(sv, temp, 0); } /* =for apidoc sv_unref_flags Unsets the RV status of the SV, and decrements the reference count of whatever was being referenced by the RV. This can almost be thought of as a reversal of C. The C argument can contain C to force the reference count to be decremented (otherwise the decrementing is conditional on the reference count being different from one or the reference being a readonly SV). See C. =cut */ void Perl_sv_unref_flags(pTHX_ SV *ref, U32 flags) { SV* const target = SvRV(ref); if (SvWEAKREF(ref)) { sv_del_backref(target, ref); SvWEAKREF_off(ref); SvRV_set(ref, NULL); return; } SvRV_set(ref, NULL); SvROK_off(ref); /* You can't have a || SvREADONLY(target) here, as $a = $$a, where $a was assigned to as BEGIN {$a = \"Foo"} will fail. */ if (SvREFCNT(target) != 1 || (flags & SV_IMMEDIATE_UNREF)) SvREFCNT_dec(target); else /* XXX Hack, but hard to make $a=$a->[1] work otherwise */ sv_2mortal(target); /* Schedule for freeing later */ } /* =for apidoc sv_untaint Untaint an SV. Use C instead. =cut */ void Perl_sv_untaint(pTHX_ SV *sv) { if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) { MAGIC * const mg = mg_find(sv, PERL_MAGIC_taint); if (mg) mg->mg_len &= ~1; } } /* =for apidoc sv_tainted Test an SV for taintedness. Use C instead. =cut */ bool Perl_sv_tainted(pTHX_ SV *sv) { if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) { const MAGIC * const mg = mg_find(sv, PERL_MAGIC_taint); if (mg && (mg->mg_len & 1) ) return TRUE; } return FALSE; } /* =for apidoc sv_setpviv Copies an integer into the given SV, also updating its string value. Does not handle 'set' magic. See C. =cut */ void Perl_sv_setpviv(pTHX_ SV *sv, IV iv) { char buf[TYPE_CHARS(UV)]; char *ebuf; char * const ptr = uiv_2buf(buf, iv, 0, 0, &ebuf); sv_setpvn(sv, ptr, ebuf - ptr); } /* =for apidoc sv_setpviv_mg Like C, but also handles 'set' magic. =cut */ void Perl_sv_setpviv_mg(pTHX_ SV *sv, IV iv) { sv_setpviv(sv, iv); SvSETMAGIC(sv); } #if defined(PERL_IMPLICIT_CONTEXT) /* pTHX_ magic can't cope with varargs, so this is a no-context * version of the main function, (which may itself be aliased to us). * Don't access this version directly. */ void Perl_sv_setpvf_nocontext(SV *sv, const char* pat, ...) { dTHX; va_list args; va_start(args, pat); sv_vsetpvf(sv, pat, &args); va_end(args); } /* pTHX_ magic can't cope with varargs, so this is a no-context * version of the main function, (which may itself be aliased to us). * Don't access this version directly. */ void Perl_sv_setpvf_mg_nocontext(SV *sv, const char* pat, ...) { dTHX; va_list args; va_start(args, pat); sv_vsetpvf_mg(sv, pat, &args); va_end(args); } #endif /* =for apidoc sv_setpvf Works like C but copies the text into the SV instead of appending it. Does not handle 'set' magic. See C. =cut */ void Perl_sv_setpvf(pTHX_ SV *sv, const char* pat, ...) { va_list args; va_start(args, pat); sv_vsetpvf(sv, pat, &args); va_end(args); } /* =for apidoc sv_vsetpvf Works like C but copies the text into the SV instead of appending it. Does not handle 'set' magic. See C. Usually used via its frontend C. =cut */ void Perl_sv_vsetpvf(pTHX_ SV *sv, const char* pat, va_list* args) { sv_vsetpvfn(sv, pat, strlen(pat), args, NULL, 0, NULL); } /* =for apidoc sv_setpvf_mg Like C, but also handles 'set' magic. =cut */ void Perl_sv_setpvf_mg(pTHX_ SV *sv, const char* pat, ...) { va_list args; va_start(args, pat); sv_vsetpvf_mg(sv, pat, &args); va_end(args); } /* =for apidoc sv_vsetpvf_mg Like C, but also handles 'set' magic. Usually used via its frontend C. =cut */ void Perl_sv_vsetpvf_mg(pTHX_ SV *sv, const char* pat, va_list* args) { sv_vsetpvfn(sv, pat, strlen(pat), args, NULL, 0, NULL); SvSETMAGIC(sv); } #if defined(PERL_IMPLICIT_CONTEXT) /* pTHX_ magic can't cope with varargs, so this is a no-context * version of the main function, (which may itself be aliased to us). * Don't access this version directly. */ void Perl_sv_catpvf_nocontext(SV *sv, const char* pat, ...) { dTHX; va_list args; va_start(args, pat); sv_vcatpvf(sv, pat, &args); va_end(args); } /* pTHX_ magic can't cope with varargs, so this is a no-context * version of the main function, (which may itself be aliased to us). * Don't access this version directly. */ void Perl_sv_catpvf_mg_nocontext(SV *sv, const char* pat, ...) { dTHX; va_list args; va_start(args, pat); sv_vcatpvf_mg(sv, pat, &args); va_end(args); } #endif /* =for apidoc sv_catpvf Processes its arguments like C and appends the formatted output to an SV. If the appended data contains "wide" characters (including, but not limited to, SVs with a UTF-8 PV formatted with %s, and characters >255 formatted with %c), the original SV might get upgraded to UTF-8. Handles 'get' magic, but not 'set' magic. See C. If the original SV was UTF-8, the pattern should be valid UTF-8; if the original SV was bytes, the pattern should be too. =cut */ void Perl_sv_catpvf(pTHX_ SV *sv, const char* pat, ...) { va_list args; va_start(args, pat); sv_vcatpvf(sv, pat, &args); va_end(args); } /* =for apidoc sv_vcatpvf Processes its arguments like C and appends the formatted output to an SV. Does not handle 'set' magic. See C. Usually used via its frontend C. =cut */ void Perl_sv_vcatpvf(pTHX_ SV *sv, const char* pat, va_list* args) { sv_vcatpvfn(sv, pat, strlen(pat), args, NULL, 0, NULL); } /* =for apidoc sv_catpvf_mg Like C, but also handles 'set' magic. =cut */ void Perl_sv_catpvf_mg(pTHX_ SV *sv, const char* pat, ...) { va_list args; va_start(args, pat); sv_vcatpvf_mg(sv, pat, &args); va_end(args); } /* =for apidoc sv_vcatpvf_mg Like C, but also handles 'set' magic. Usually used via its frontend C. =cut */ void Perl_sv_vcatpvf_mg(pTHX_ SV *sv, const char* pat, va_list* args) { sv_vcatpvfn(sv, pat, strlen(pat), args, NULL, 0, NULL); SvSETMAGIC(sv); } /* =for apidoc sv_vsetpvfn Works like C but copies the text into the SV instead of appending it. Usually used via one of its frontends C and C. =cut */ void Perl_sv_vsetpvfn(pTHX_ SV *sv, const char *pat, STRLEN patlen, va_list *args, SV **svargs, I32 svmax, bool *maybe_tainted) { sv_setpvn(sv, "", 0); sv_vcatpvfn(sv, pat, patlen, args, svargs, svmax, maybe_tainted); } STATIC I32 S_expect_number(pTHX_ char** pattern) { dVAR; I32 var = 0; switch (**pattern) { case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': var = *(*pattern)++ - '0'; while (isDIGIT(**pattern)) { const I32 tmp = var * 10 + (*(*pattern)++ - '0'); if (tmp < var) Perl_croak(aTHX_ "Integer overflow in format string for %s", (PL_op ? OP_NAME(PL_op) : "sv_vcatpvfn")); var = tmp; } } return var; } STATIC char * S_F0convert(NV nv, char *endbuf, STRLEN *len) { const int neg = nv < 0; UV uv; if (neg) nv = -nv; if (nv < UV_MAX) { char *p = endbuf; nv += 0.5; uv = (UV)nv; if (uv & 1 && uv == nv) uv--; /* Round to even */ do { const unsigned dig = uv % 10; *--p = '0' + dig; } while (uv /= 10); if (neg) *--p = '-'; *len = endbuf - p; return p; } return NULL; } /* =for apidoc sv_vcatpvfn Processes its arguments like C and appends the formatted output to an SV. Uses an array of SVs if the C style variable argument list is missing (NULL). When running with taint checks enabled, indicates via C if results are untrustworthy (often due to the use of locales). Usually used via one of its frontends C and C. =cut */ #define VECTORIZE_ARGS vecsv = va_arg(*args, SV*);\ vecstr = (U8*)SvPV_const(vecsv,veclen);\ vec_utf8 = DO_UTF8(vecsv); /* XXX maybe_tainted is never assigned to, so the doc above is lying. */ void Perl_sv_vcatpvfn(pTHX_ SV *sv, const char *pat, STRLEN patlen, va_list *args, SV **svargs, I32 svmax, bool *maybe_tainted) { dVAR; char *p; char *q; const char *patend; STRLEN origlen; I32 svix = 0; static const char nullstr[] = "(null)"; SV *argsv = NULL; bool has_utf8 = DO_UTF8(sv); /* has the result utf8? */ const bool pat_utf8 = has_utf8; /* the pattern is in utf8? */ SV *nsv = NULL; /* Times 4: a decimal digit takes more than 3 binary digits. * NV_DIG: mantissa takes than many decimal digits. * Plus 32: Playing safe. */ char ebuf[IV_DIG * 4 + NV_DIG + 32]; /* large enough for "%#.#f" --chip */ /* what about long double NVs? --jhi */ PERL_UNUSED_ARG(maybe_tainted); /* no matter what, this is a string now */ (void)SvPV_force(sv, origlen); /* special-case "", "%s", and "%-p" (SVf - see below) */ if (patlen == 0) return; if (patlen == 2 && pat[0] == '%' && pat[1] == 's') { if (args) { const char * const s = va_arg(*args, char*); sv_catpv(sv, s ? s : nullstr); } else if (svix < svmax) { sv_catsv(sv, *svargs); } return; } if (args && patlen == 3 && pat[0] == '%' && pat[1] == '-' && pat[2] == 'p') { argsv = va_arg(*args, SV*); sv_catsv(sv, argsv); return; } #ifndef USE_LONG_DOUBLE /* special-case "%.[gf]" */ if ( !args && patlen <= 5 && pat[0] == '%' && pat[1] == '.' && (pat[patlen-1] == 'g' || pat[patlen-1] == 'f') ) { unsigned digits = 0; const char *pp; pp = pat + 2; while (*pp >= '0' && *pp <= '9') digits = 10 * digits + (*pp++ - '0'); if (pp - pat == (int)patlen - 1) { NV nv; if (svix < svmax) nv = SvNV(*svargs); else return; if (*pp == 'g') { /* Add check for digits != 0 because it seems that some gconverts are buggy in this case, and we don't yet have a Configure test for this. */ if (digits && digits < sizeof(ebuf) - NV_DIG - 10) { /* 0, point, slack */ Gconvert(nv, (int)digits, 0, ebuf); sv_catpv(sv, ebuf); if (*ebuf) /* May return an empty string for digits==0 */ return; } } else if (!digits) { STRLEN l; if ((p = F0convert(nv, ebuf + sizeof ebuf, &l))) { sv_catpvn(sv, p, l); return; } } } } #endif /* !USE_LONG_DOUBLE */ if (!args && svix < svmax && DO_UTF8(*svargs)) has_utf8 = TRUE; patend = (char*)pat + patlen; for (p = (char*)pat; p < patend; p = q) { bool alt = FALSE; bool left = FALSE; bool vectorize = FALSE; bool vectorarg = FALSE; bool vec_utf8 = FALSE; char fill = ' '; char plus = 0; char intsize = 0; STRLEN width = 0; STRLEN zeros = 0; bool has_precis = FALSE; STRLEN precis = 0; const I32 osvix = svix; bool is_utf8 = FALSE; /* is this item utf8? */ #ifdef HAS_LDBL_SPRINTF_BUG /* This is to try to fix a bug with irix/nonstop-ux/powerux and with sfio - Allen */ bool fix_ldbl_sprintf_bug = FALSE; #endif char esignbuf[4]; U8 utf8buf[UTF8_MAXBYTES+1]; STRLEN esignlen = 0; const char *eptr = NULL; STRLEN elen = 0; SV *vecsv = NULL; const U8 *vecstr = NULL; STRLEN veclen = 0; char c = 0; int i; unsigned base = 0; IV iv = 0; UV uv = 0; /* we need a long double target in case HAS_LONG_DOUBLE but not USE_LONG_DOUBLE */ #if defined(HAS_LONG_DOUBLE) && LONG_DOUBLESIZE > DOUBLESIZE long double nv; #else NV nv; #endif STRLEN have; STRLEN need; STRLEN gap; const char *dotstr = "."; STRLEN dotstrlen = 1; I32 efix = 0; /* explicit format parameter index */ I32 ewix = 0; /* explicit width index */ I32 epix = 0; /* explicit precision index */ I32 evix = 0; /* explicit vector index */ bool asterisk = FALSE; /* echo everything up to the next format specification */ for (q = p; q < patend && *q != '%'; ++q) ; if (q > p) { if (has_utf8 && !pat_utf8) sv_catpvn_utf8_upgrade(sv, p, q - p, nsv); else sv_catpvn(sv, p, q - p); p = q; } if (q++ >= patend) break; /* We allow format specification elements in this order: \d+\$ explicit format parameter index [-+ 0#]+ flags v|\*(\d+\$)?v vector with optional (optionally specified) arg 0 flag (as above): repeated to allow "v02" \d+|\*(\d+\$)? width using optional (optionally specified) arg \.(\d*|\*(\d+\$)?) precision using optional (optionally specified) arg [hlqLV] size [%bcdefginopsuxDFOUX] format (mandatory) */ if (args) { /* As of perl5.9.3, printf format checking is on by default. Internally, perl uses %p formats to provide an escape to some extended formatting. This block deals with those extensions: if it does not match, (char*)q is reset and the normal format processing code is used. Currently defined extensions are: %p include pointer address (standard) %-p (SVf) include an SV (previously %_) %-p include an SV with precision %1p (VDf) include a v-string (as %vd) %p reserved for future extensions Robin Barker 2005-07-14 */ char* r = q; bool sv = FALSE; STRLEN n = 0; if (*q == '-') sv = *q++; n = expect_number(&q); if (*q++ == 'p') { if (sv) { /* SVf */ if (n) { precis = n; has_precis = TRUE; } argsv = va_arg(*args, SV*); eptr = SvPVx_const(argsv, elen); if (DO_UTF8(argsv)) is_utf8 = TRUE; goto string; } #if vdNUMBER else if (n == vdNUMBER) { /* VDf */ vectorize = TRUE; VECTORIZE_ARGS goto format_vd; } #endif else if (n) { if (ckWARN_d(WARN_INTERNAL)) Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "internal %%p might conflict with future printf extensions"); } } q = r; } if ( (width = expect_number(&q)) ) { if (*q == '$') { ++q; efix = width; } else { goto gotwidth; } } /* FLAGS */ while (*q) { switch (*q) { case ' ': case '+': if (plus == '+' && *q == ' ') /* '+' over ' ' */ q++; else plus = *q++; continue; case '-': left = TRUE; q++; continue; case '0': fill = *q++; continue; case '#': alt = TRUE; q++; continue; default: break; } break; } tryasterisk: if (*q == '*') { q++; if ( (ewix = expect_number(&q)) ) if (*q++ != '$') goto unknown; asterisk = TRUE; } if (*q == 'v') { q++; if (vectorize) goto unknown; if ((vectorarg = asterisk)) { evix = ewix; ewix = 0; asterisk = FALSE; } vectorize = TRUE; goto tryasterisk; } if (!asterisk) { if( *q == '0' ) fill = *q++; width = expect_number(&q); } if (vectorize) { if (vectorarg) { if (args) vecsv = va_arg(*args, SV*); else if (evix) { vecsv = (evix > 0 && evix <= svmax) ? svargs[evix-1] : &PL_sv_undef; } else { vecsv = svix < svmax ? svargs[svix++] : &PL_sv_undef; } dotstr = SvPV_const(vecsv, dotstrlen); /* Keep the DO_UTF8 test *after* the SvPV call, else things go bad with tied or overloaded values that return UTF8. */ if (DO_UTF8(vecsv)) is_utf8 = TRUE; else if (has_utf8) { vecsv = sv_mortalcopy(vecsv); sv_utf8_upgrade(vecsv); dotstr = SvPV_const(vecsv, dotstrlen); is_utf8 = TRUE; } } if (args) { VECTORIZE_ARGS } else if (efix ? (efix > 0 && efix <= svmax) : svix < svmax) { vecsv = svargs[efix ? efix-1 : svix++]; vecstr = (U8*)SvPV_const(vecsv,veclen); vec_utf8 = DO_UTF8(vecsv); /* if this is a version object, we need to convert * back into v-string notation and then let the * vectorize happen normally */ if (sv_derived_from(vecsv, "version")) { char *version = savesvpv(vecsv); if ( hv_exists((HV*)SvRV(vecsv), "alpha", 5 ) ) { Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "vector argument not supported with alpha versions"); goto unknown; } vecsv = sv_newmortal(); /* scan_vstring is expected to be called during * tokenization, so we need to fake up the end * of the buffer for it */ PL_bufend = version + veclen; scan_vstring(version, vecsv); vecstr = (U8*)SvPV_const(vecsv, veclen); vec_utf8 = DO_UTF8(vecsv); Safefree(version); } } else { vecstr = (U8*)""; veclen = 0; } } if (asterisk) { if (args) i = va_arg(*args, int); else i = (ewix ? ewix <= svmax : svix < svmax) ? SvIVx(svargs[ewix ? ewix-1 : svix++]) : 0; left |= (i < 0); width = (i < 0) ? -i : i; } gotwidth: /* PRECISION */ if (*q == '.') { q++; if (*q == '*') { q++; if ( ((epix = expect_number(&q))) && (*q++ != '$') ) goto unknown; /* XXX: todo, support specified precision parameter */ if (epix) goto unknown; if (args) i = va_arg(*args, int); else i = (ewix ? ewix <= svmax : svix < svmax) ? SvIVx(svargs[ewix ? ewix-1 : svix++]) : 0; precis = i; has_precis = !(i < 0); } else { precis = 0; while (isDIGIT(*q)) precis = precis * 10 + (*q++ - '0'); has_precis = TRUE; } } /* SIZE */ switch (*q) { #ifdef WIN32 case 'I': /* Ix, I32x, and I64x */ # ifdef WIN64 if (q[1] == '6' && q[2] == '4') { q += 3; intsize = 'q'; break; } # endif if (q[1] == '3' && q[2] == '2') { q += 3; break; } # ifdef WIN64 intsize = 'q'; # endif q++; break; #endif #if defined(HAS_QUAD) || defined(HAS_LONG_DOUBLE) case 'L': /* Ld */ /*FALLTHROUGH*/ #ifdef HAS_QUAD case 'q': /* qd */ #endif intsize = 'q'; q++; break; #endif case 'l': #if defined(HAS_QUAD) || defined(HAS_LONG_DOUBLE) if (*(q + 1) == 'l') { /* lld, llf */ intsize = 'q'; q += 2; break; } #endif /*FALLTHROUGH*/ case 'h': /*FALLTHROUGH*/ case 'V': intsize = *q++; break; } /* CONVERSION */ if (*q == '%') { eptr = q++; elen = 1; if (vectorize) { c = '%'; goto unknown; } goto string; } if (!vectorize && !args) { if (efix) { const I32 i = efix-1; argsv = (i >= 0 && i < svmax) ? svargs[i] : &PL_sv_undef; } else { argsv = (svix >= 0 && svix < svmax) ? svargs[svix++] : &PL_sv_undef; } } switch (c = *q++) { /* STRINGS */ case 'c': if (vectorize) goto unknown; uv = (args) ? va_arg(*args, int) : SvIVx(argsv); if ((uv > 255 || (!UNI_IS_INVARIANT(uv) && SvUTF8(sv))) && !IN_BYTES) { eptr = (char*)utf8buf; elen = uvchr_to_utf8((U8*)eptr, uv) - utf8buf; is_utf8 = TRUE; } else { c = (char)uv; eptr = &c; elen = 1; } goto string; case 's': if (vectorize) goto unknown; if (args) { eptr = va_arg(*args, char*); if (eptr) #ifdef MACOS_TRADITIONAL /* On MacOS, %#s format is used for Pascal strings */ if (alt) elen = *eptr++; else #endif elen = strlen(eptr); else { eptr = (char *)nullstr; elen = sizeof nullstr - 1; } } else { eptr = SvPVx_const(argsv, elen); if (DO_UTF8(argsv)) { I32 old_precis = precis; if (has_precis && precis < elen) { I32 p = precis; sv_pos_u2b(argsv, &p, 0); /* sticks at end */ precis = p; } if (width) { /* fudge width (can't fudge elen) */ if (has_precis && precis < elen) width += precis - old_precis; else width += elen - sv_len_utf8(argsv); } is_utf8 = TRUE; } } string: if (has_precis && elen > precis) elen = precis; break; /* INTEGERS */ case 'p': if (alt || vectorize) goto unknown; uv = PTR2UV(args ? va_arg(*args, void*) : argsv); base = 16; goto integer; case 'D': #ifdef IV_IS_QUAD intsize = 'q'; #else intsize = 'l'; #endif /*FALLTHROUGH*/ case 'd': case 'i': #if vdNUMBER format_vd: #endif if (vectorize) { STRLEN ulen; if (!veclen) continue; if (vec_utf8) uv = utf8n_to_uvchr(vecstr, veclen, &ulen, UTF8_ALLOW_ANYUV); else { uv = *vecstr; ulen = 1; } vecstr += ulen; veclen -= ulen; if (plus) esignbuf[esignlen++] = plus; } else if (args) { switch (intsize) { case 'h': iv = (short)va_arg(*args, int); break; case 'l': iv = va_arg(*args, long); break; case 'V': iv = va_arg(*args, IV); break; default: iv = va_arg(*args, int); break; #ifdef HAS_QUAD case 'q': iv = va_arg(*args, Quad_t); break; #endif } } else { IV tiv = SvIVx(argsv); /* work around GCC bug #13488 */ switch (intsize) { case 'h': iv = (short)tiv; break; case 'l': iv = (long)tiv; break; case 'V': default: iv = tiv; break; #ifdef HAS_QUAD case 'q': iv = (Quad_t)tiv; break; #endif } } if ( !vectorize ) /* we already set uv above */ { if (iv >= 0) { uv = iv; if (plus) esignbuf[esignlen++] = plus; } else { uv = -iv; esignbuf[esignlen++] = '-'; } } base = 10; goto integer; case 'U': #ifdef IV_IS_QUAD intsize = 'q'; #else intsize = 'l'; #endif /*FALLTHROUGH*/ case 'u': base = 10; goto uns_integer; case 'B': case 'b': base = 2; goto uns_integer; case 'O': #ifdef IV_IS_QUAD intsize = 'q'; #else intsize = 'l'; #endif /*FALLTHROUGH*/ case 'o': base = 8; goto uns_integer; case 'X': case 'x': base = 16; uns_integer: if (vectorize) { STRLEN ulen; vector: if (!veclen) continue; if (vec_utf8) uv = utf8n_to_uvchr(vecstr, veclen, &ulen, UTF8_ALLOW_ANYUV); else { uv = *vecstr; ulen = 1; } vecstr += ulen; veclen -= ulen; } else if (args) { switch (intsize) { case 'h': uv = (unsigned short)va_arg(*args, unsigned); break; case 'l': uv = va_arg(*args, unsigned long); break; case 'V': uv = va_arg(*args, UV); break; default: uv = va_arg(*args, unsigned); break; #ifdef HAS_QUAD case 'q': uv = va_arg(*args, Uquad_t); break; #endif } } else { UV tuv = SvUVx(argsv); /* work around GCC bug #13488 */ switch (intsize) { case 'h': uv = (unsigned short)tuv; break; case 'l': uv = (unsigned long)tuv; break; case 'V': default: uv = tuv; break; #ifdef HAS_QUAD case 'q': uv = (Uquad_t)tuv; break; #endif } } integer: { char *ptr = ebuf + sizeof ebuf; bool tempalt = uv ? alt : FALSE; /* Vectors can't change alt */ zeros = 0; switch (base) { unsigned dig; case 16: p = (char *)((c == 'X') ? PL_hexdigit + 16 : PL_hexdigit); do { dig = uv & 15; *--ptr = p[dig]; } while (uv >>= 4); if (tempalt) { esignbuf[esignlen++] = '0'; esignbuf[esignlen++] = c; /* 'x' or 'X' */ } break; case 8: do { dig = uv & 7; *--ptr = '0' + dig; } while (uv >>= 3); if (alt && *ptr != '0') *--ptr = '0'; break; case 2: do { dig = uv & 1; *--ptr = '0' + dig; } while (uv >>= 1); if (tempalt) { esignbuf[esignlen++] = '0'; esignbuf[esignlen++] = c; } break; default: /* it had better be ten or less */ do { dig = uv % base; *--ptr = '0' + dig; } while (uv /= base); break; } elen = (ebuf + sizeof ebuf) - ptr; eptr = ptr; if (has_precis) { if (precis > elen) zeros = precis - elen; else if (precis == 0 && elen == 1 && *eptr == '0' && !(base == 8 && alt)) /* "%#.0o" prints "0" */ elen = 0; /* a precision nullifies the 0 flag. */ if (fill == '0') fill = ' '; } } break; /* FLOATING POINT */ case 'F': c = 'f'; /* maybe %F isn't supported here */ /*FALLTHROUGH*/ case 'e': case 'E': case 'f': case 'g': case 'G': if (vectorize) goto unknown; /* This is evil, but floating point is even more evil */ /* for SV-style calling, we can only get NV for C-style calling, we assume %f is double; for simplicity we allow any of %Lf, %llf, %qf for long double */ switch (intsize) { case 'V': #if defined(USE_LONG_DOUBLE) intsize = 'q'; #endif break; /* [perl #20339] - we should accept and ignore %lf rather than die */ case 'l': /*FALLTHROUGH*/ default: #if defined(USE_LONG_DOUBLE) intsize = args ? 0 : 'q'; #endif break; case 'q': #if defined(HAS_LONG_DOUBLE) break; #else /*FALLTHROUGH*/ #endif case 'h': goto unknown; } /* now we need (long double) if intsize == 'q', else (double) */ nv = (args) ? #if LONG_DOUBLESIZE > DOUBLESIZE intsize == 'q' ? va_arg(*args, long double) : va_arg(*args, double) #else va_arg(*args, double) #endif : SvNVx(argsv); need = 0; if (c != 'e' && c != 'E') { i = PERL_INT_MIN; /* FIXME: if HAS_LONG_DOUBLE but not USE_LONG_DOUBLE this will cast our (long double) to (double) */ (void)Perl_frexp(nv, &i); if (i == PERL_INT_MIN) Perl_die(aTHX_ "panic: frexp"); if (i > 0) need = BIT_DIGITS(i); } need += has_precis ? precis : 6; /* known default */ if (need < width) need = width; #ifdef HAS_LDBL_SPRINTF_BUG /* This is to try to fix a bug with irix/nonstop-ux/powerux and with sfio - Allen */ # ifdef DBL_MAX # define MY_DBL_MAX DBL_MAX # else /* XXX guessing! HUGE_VAL may be defined as infinity, so not using */ # if DOUBLESIZE >= 8 # define MY_DBL_MAX 1.7976931348623157E+308L # else # define MY_DBL_MAX 3.40282347E+38L # endif # endif # ifdef HAS_LDBL_SPRINTF_BUG_LESS1 /* only between -1L & 1L - Allen */ # define MY_DBL_MAX_BUG 1L # else # define MY_DBL_MAX_BUG MY_DBL_MAX # endif # ifdef DBL_MIN # define MY_DBL_MIN DBL_MIN # else /* XXX guessing! -Allen */ # if DOUBLESIZE >= 8 # define MY_DBL_MIN 2.2250738585072014E-308L # else # define MY_DBL_MIN 1.17549435E-38L # endif # endif if ((intsize == 'q') && (c == 'f') && ((nv < MY_DBL_MAX_BUG) && (nv > -MY_DBL_MAX_BUG)) && (need < DBL_DIG)) { /* it's going to be short enough that * long double precision is not needed */ if ((nv <= 0L) && (nv >= -0L)) fix_ldbl_sprintf_bug = TRUE; /* 0 is 0 - easiest */ else { /* would use Perl_fp_class as a double-check but not * functional on IRIX - see perl.h comments */ if ((nv >= MY_DBL_MIN) || (nv <= -MY_DBL_MIN)) { /* It's within the range that a double can represent */ #if defined(DBL_MAX) && !defined(DBL_MIN) if ((nv >= ((long double)1/DBL_MAX)) || (nv <= (-(long double)1/DBL_MAX))) #endif fix_ldbl_sprintf_bug = TRUE; } } if (fix_ldbl_sprintf_bug == TRUE) { double temp; intsize = 0; temp = (double)nv; nv = (NV)temp; } } # undef MY_DBL_MAX # undef MY_DBL_MAX_BUG # undef MY_DBL_MIN #endif /* HAS_LDBL_SPRINTF_BUG */ need += 20; /* fudge factor */ if (PL_efloatsize < need) { Safefree(PL_efloatbuf); PL_efloatsize = need + 20; /* more fudge */ Newx(PL_efloatbuf, PL_efloatsize, char); PL_efloatbuf[0] = '\0'; } if ( !(width || left || plus || alt) && fill != '0' && has_precis && intsize != 'q' ) { /* Shortcuts */ /* See earlier comment about buggy Gconvert when digits, aka precis is 0 */ if ( c == 'g' && precis) { Gconvert((NV)nv, (int)precis, 0, PL_efloatbuf); /* May return an empty string for digits==0 */ if (*PL_efloatbuf) { elen = strlen(PL_efloatbuf); goto float_converted; } } else if ( c == 'f' && !precis) { if ((eptr = F0convert(nv, ebuf + sizeof ebuf, &elen))) break; } } { char *ptr = ebuf + sizeof ebuf; *--ptr = '\0'; *--ptr = c; /* FIXME: what to do if HAS_LONG_DOUBLE but not PERL_PRIfldbl? */ #if defined(HAS_LONG_DOUBLE) && defined(PERL_PRIfldbl) if (intsize == 'q') { /* Copy the one or more characters in a long double * format before the 'base' ([efgEFG]) character to * the format string. */ static char const prifldbl[] = PERL_PRIfldbl; char const *p = prifldbl + sizeof(prifldbl) - 3; while (p >= prifldbl) { *--ptr = *p--; } } #endif if (has_precis) { base = precis; do { *--ptr = '0' + (base % 10); } while (base /= 10); *--ptr = '.'; } if (width) { base = width; do { *--ptr = '0' + (base % 10); } while (base /= 10); } if (fill == '0') *--ptr = fill; if (left) *--ptr = '-'; if (plus) *--ptr = plus; if (alt) *--ptr = '#'; *--ptr = '%'; /* No taint. Otherwise we are in the strange situation * where printf() taints but print($float) doesn't. * --jhi */ #if defined(HAS_LONG_DOUBLE) elen = ((intsize == 'q') ? my_snprintf(PL_efloatbuf, PL_efloatsize, ptr, nv) : my_snprintf(PL_efloatbuf, PL_efloatsize, ptr, (double)nv)); #else elen = my_sprintf(PL_efloatbuf, ptr, nv); #endif } float_converted: eptr = PL_efloatbuf; break; /* SPECIAL */ case 'n': if (vectorize) goto unknown; i = SvCUR(sv) - origlen; if (args) { switch (intsize) { case 'h': *(va_arg(*args, short*)) = i; break; default: *(va_arg(*args, int*)) = i; break; case 'l': *(va_arg(*args, long*)) = i; break; case 'V': *(va_arg(*args, IV*)) = i; break; #ifdef HAS_QUAD case 'q': *(va_arg(*args, Quad_t*)) = i; break; #endif } } else sv_setuv_mg(argsv, (UV)i); continue; /* not "break" */ /* UNKNOWN */ default: unknown: if (!args && (PL_op->op_type == OP_PRTF || PL_op->op_type == OP_SPRINTF) && ckWARN(WARN_PRINTF)) { SV * const msg = sv_newmortal(); Perl_sv_setpvf(aTHX_ msg, "Invalid conversion in %sprintf: ", (PL_op->op_type == OP_PRTF) ? "" : "s"); if (c) { if (isPRINT(c)) Perl_sv_catpvf(aTHX_ msg, "\"%%%c\"", c & 0xFF); else Perl_sv_catpvf(aTHX_ msg, "\"%%\\%03"UVof"\"", (UV)c & 0xFF); } else sv_catpvs(msg, "end of string"); Perl_warner(aTHX_ packWARN(WARN_PRINTF), "%"SVf, (void*)msg); /* yes, this is reentrant */ } /* output mangled stuff ... */ if (c == '\0') --q; eptr = p; elen = q - p; /* ... right here, because formatting flags should not apply */ SvGROW(sv, SvCUR(sv) + elen + 1); p = SvEND(sv); Copy(eptr, p, elen, char); p += elen; *p = '\0'; SvCUR_set(sv, p - SvPVX_const(sv)); svix = osvix; continue; /* not "break" */ } if (is_utf8 != has_utf8) { if (is_utf8) { if (SvCUR(sv)) sv_utf8_upgrade(sv); } else { const STRLEN old_elen = elen; SV * const nsv = sv_2mortal(newSVpvn(eptr, elen)); sv_utf8_upgrade(nsv); eptr = SvPVX_const(nsv); elen = SvCUR(nsv); if (width) { /* fudge width (can't fudge elen) */ width += elen - old_elen; } is_utf8 = TRUE; } } have = esignlen + zeros + elen; if (have < zeros) Perl_croak_nocontext(PL_memory_wrap); need = (have > width ? have : width); gap = need - have; if (need >= (((STRLEN)~0) - SvCUR(sv) - dotstrlen - 1)) Perl_croak_nocontext(PL_memory_wrap); SvGROW(sv, SvCUR(sv) + need + dotstrlen + 1); p = SvEND(sv); if (esignlen && fill == '0') { int i; for (i = 0; i < (int)esignlen; i++) *p++ = esignbuf[i]; } if (gap && !left) { memset(p, fill, gap); p += gap; } if (esignlen && fill != '0') { int i; for (i = 0; i < (int)esignlen; i++) *p++ = esignbuf[i]; } if (zeros) { int i; for (i = zeros; i; i--) *p++ = '0'; } if (elen) { Copy(eptr, p, elen, char); p += elen; } if (gap && left) { memset(p, ' ', gap); p += gap; } if (vectorize) { if (veclen) { Copy(dotstr, p, dotstrlen, char); p += dotstrlen; } else vectorize = FALSE; /* done iterating over vecstr */ } if (is_utf8) has_utf8 = TRUE; if (has_utf8) SvUTF8_on(sv); *p = '\0'; SvCUR_set(sv, p - SvPVX_const(sv)); if (vectorize) { esignlen = 0; goto vector; } } } /* ========================================================================= =head1 Cloning an interpreter All the macros and functions in this section are for the private use of the main function, perl_clone(). The foo_dup() functions make an exact copy of an existing foo thinngy. During the course of a cloning, a hash table is used to map old addresses to new addresses. The table is created and manipulated with the ptr_table_* functions. =cut ============================================================================*/ #if defined(USE_ITHREADS) /* XXX Remove this so it doesn't have to go thru the macro and return for nothing */ #ifndef GpREFCNT_inc # define GpREFCNT_inc(gp) ((gp) ? (++(gp)->gp_refcnt, (gp)) : (GP*)NULL) #endif /* Certain cases in Perl_ss_dup have been merged, by relying on the fact that currently av_dup, gv_dup and hv_dup are the same as sv_dup. If this changes, please unmerge ss_dup. */ #define sv_dup_inc(s,t) SvREFCNT_inc(sv_dup(s,t)) #define sv_dup_inc_NN(s,t) SvREFCNT_inc_NN(sv_dup(s,t)) #define av_dup(s,t) (AV*)sv_dup((SV*)s,t) #define av_dup_inc(s,t) (AV*)SvREFCNT_inc(sv_dup((SV*)s,t)) #define hv_dup(s,t) (HV*)sv_dup((SV*)s,t) #define hv_dup_inc(s,t) (HV*)SvREFCNT_inc(sv_dup((SV*)s,t)) #define cv_dup(s,t) (CV*)sv_dup((SV*)s,t) #define cv_dup_inc(s,t) (CV*)SvREFCNT_inc(sv_dup((SV*)s,t)) #define io_dup(s,t) (IO*)sv_dup((SV*)s,t) #define io_dup_inc(s,t) (IO*)SvREFCNT_inc(sv_dup((SV*)s,t)) #define gv_dup(s,t) (GV*)sv_dup((SV*)s,t) #define gv_dup_inc(s,t) (GV*)SvREFCNT_inc(sv_dup((SV*)s,t)) #define SAVEPV(p) ((p) ? savepv(p) : NULL) #define SAVEPVN(p,n) ((p) ? savepvn(p,n) : NULL) /* duplicate a file handle */ PerlIO * Perl_fp_dup(pTHX_ PerlIO *fp, char type, CLONE_PARAMS *param) { PerlIO *ret; PERL_UNUSED_ARG(type); if (!fp) return (PerlIO*)NULL; /* look for it in the table first */ ret = (PerlIO*)ptr_table_fetch(PL_ptr_table, fp); if (ret) return ret; /* create anew and remember what it is */ ret = PerlIO_fdupopen(aTHX_ fp, param, PERLIO_DUP_CLONE); ptr_table_store(PL_ptr_table, fp, ret); return ret; } /* duplicate a directory handle */ DIR * Perl_dirp_dup(pTHX_ DIR *dp) { PERL_UNUSED_CONTEXT; if (!dp) return (DIR*)NULL; /* XXX TODO */ return dp; } /* duplicate a typeglob */ GP * Perl_gp_dup(pTHX_ GP *gp, CLONE_PARAMS* param) { GP *ret; if (!gp) return (GP*)NULL; /* look for it in the table first */ ret = (GP*)ptr_table_fetch(PL_ptr_table, gp); if (ret) return ret; /* create anew and remember what it is */ Newxz(ret, 1, GP); ptr_table_store(PL_ptr_table, gp, ret); /* clone */ ret->gp_refcnt = 0; /* must be before any other dups! */ ret->gp_sv = sv_dup_inc(gp->gp_sv, param); ret->gp_io = io_dup_inc(gp->gp_io, param); ret->gp_form = cv_dup_inc(gp->gp_form, param); ret->gp_av = av_dup_inc(gp->gp_av, param); ret->gp_hv = hv_dup_inc(gp->gp_hv, param); ret->gp_egv = gv_dup(gp->gp_egv, param);/* GvEGV is not refcounted */ ret->gp_cv = cv_dup_inc(gp->gp_cv, param); ret->gp_cvgen = gp->gp_cvgen; ret->gp_line = gp->gp_line; ret->gp_file_hek = hek_dup(gp->gp_file_hek, param); return ret; } /* duplicate a chain of magic */ MAGIC * Perl_mg_dup(pTHX_ MAGIC *mg, CLONE_PARAMS* param) { MAGIC *mgprev = (MAGIC*)NULL; MAGIC *mgret; if (!mg) return (MAGIC*)NULL; /* look for it in the table first */ mgret = (MAGIC*)ptr_table_fetch(PL_ptr_table, mg); if (mgret) return mgret; for (; mg; mg = mg->mg_moremagic) { MAGIC *nmg; Newxz(nmg, 1, MAGIC); if (mgprev) mgprev->mg_moremagic = nmg; else mgret = nmg; nmg->mg_virtual = mg->mg_virtual; /* XXX copy dynamic vtable? */ nmg->mg_private = mg->mg_private; nmg->mg_type = mg->mg_type; nmg->mg_flags = mg->mg_flags; if (mg->mg_type == PERL_MAGIC_qr) { nmg->mg_obj = (SV*)CALLREGDUPE((REGEXP*)mg->mg_obj, param); } else if(mg->mg_type == PERL_MAGIC_backref) { /* The backref AV has its reference count deliberately bumped by 1. */ nmg->mg_obj = SvREFCNT_inc(av_dup_inc((AV*) mg->mg_obj, param)); } else if (mg->mg_type == PERL_MAGIC_symtab) { nmg->mg_obj = mg->mg_obj; } else { nmg->mg_obj = (mg->mg_flags & MGf_REFCOUNTED) ? sv_dup_inc(mg->mg_obj, param) : sv_dup(mg->mg_obj, param); } nmg->mg_len = mg->mg_len; nmg->mg_ptr = mg->mg_ptr; /* XXX random ptr? */ if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) { if (mg->mg_len > 0) { nmg->mg_ptr = SAVEPVN(mg->mg_ptr, mg->mg_len); if (mg->mg_type == PERL_MAGIC_overload_table && AMT_AMAGIC((AMT*)mg->mg_ptr)) { const AMT * const amtp = (AMT*)mg->mg_ptr; AMT * const namtp = (AMT*)nmg->mg_ptr; I32 i; for (i = 1; i < NofAMmeth; i++) { namtp->table[i] = cv_dup_inc(amtp->table[i], param); } } } else if (mg->mg_len == HEf_SVKEY) nmg->mg_ptr = (char*)sv_dup_inc((SV*)mg->mg_ptr, param); } if ((mg->mg_flags & MGf_DUP) && mg->mg_virtual && mg->mg_virtual->svt_dup) { CALL_FPTR(nmg->mg_virtual->svt_dup)(aTHX_ nmg, param); } mgprev = nmg; } return mgret; } /* create a new pointer-mapping table */ PTR_TBL_t * Perl_ptr_table_new(pTHX) { PTR_TBL_t *tbl; PERL_UNUSED_CONTEXT; Newxz(tbl, 1, PTR_TBL_t); tbl->tbl_max = 511; tbl->tbl_items = 0; Newxz(tbl->tbl_ary, tbl->tbl_max + 1, PTR_TBL_ENT_t*); return tbl; } #define PTR_TABLE_HASH(ptr) \ ((PTR2UV(ptr) >> 3) ^ (PTR2UV(ptr) >> (3 + 7)) ^ (PTR2UV(ptr) >> (3 + 17))) /* we use the PTE_SVSLOT 'reservation' made above, both here (in the following define) and at call to new_body_inline made below in Perl_ptr_table_store() */ #define del_pte(p) del_body_type(p, PTE_SVSLOT) /* map an existing pointer using a table */ STATIC PTR_TBL_ENT_t * S_ptr_table_find(PTR_TBL_t *tbl, const void *sv) { PTR_TBL_ENT_t *tblent; const UV hash = PTR_TABLE_HASH(sv); assert(tbl); tblent = tbl->tbl_ary[hash & tbl->tbl_max]; for (; tblent; tblent = tblent->next) { if (tblent->oldval == sv) return tblent; } return NULL; } void * Perl_ptr_table_fetch(pTHX_ PTR_TBL_t *tbl, const void *sv) { PTR_TBL_ENT_t const *const tblent = ptr_table_find(tbl, sv); PERL_UNUSED_CONTEXT; return tblent ? tblent->newval : NULL; } /* add a new entry to a pointer-mapping table */ void Perl_ptr_table_store(pTHX_ PTR_TBL_t *tbl, const void *oldsv, void *newsv) { PTR_TBL_ENT_t *tblent = ptr_table_find(tbl, oldsv); PERL_UNUSED_CONTEXT; if (tblent) { tblent->newval = newsv; } else { const UV entry = PTR_TABLE_HASH(oldsv) & tbl->tbl_max; new_body_inline(tblent, PTE_SVSLOT); tblent->oldval = oldsv; tblent->newval = newsv; tblent->next = tbl->tbl_ary[entry]; tbl->tbl_ary[entry] = tblent; tbl->tbl_items++; if (tblent->next && tbl->tbl_items > tbl->tbl_max) ptr_table_split(tbl); } } /* double the hash bucket size of an existing ptr table */ void Perl_ptr_table_split(pTHX_ PTR_TBL_t *tbl) { PTR_TBL_ENT_t **ary = tbl->tbl_ary; const UV oldsize = tbl->tbl_max + 1; UV newsize = oldsize * 2; UV i; PERL_UNUSED_CONTEXT; Renew(ary, newsize, PTR_TBL_ENT_t*); Zero(&ary[oldsize], newsize-oldsize, PTR_TBL_ENT_t*); tbl->tbl_max = --newsize; tbl->tbl_ary = ary; for (i=0; i < oldsize; i++, ary++) { PTR_TBL_ENT_t **curentp, **entp, *ent; if (!*ary) continue; curentp = ary + oldsize; for (entp = ary, ent = *ary; ent; ent = *entp) { if ((newsize & PTR_TABLE_HASH(ent->oldval)) != i) { *entp = ent->next; ent->next = *curentp; *curentp = ent; continue; } else entp = &ent->next; } } } /* remove all the entries from a ptr table */ void Perl_ptr_table_clear(pTHX_ PTR_TBL_t *tbl) { if (tbl && tbl->tbl_items) { register PTR_TBL_ENT_t * const * const array = tbl->tbl_ary; UV riter = tbl->tbl_max; do { PTR_TBL_ENT_t *entry = array[riter]; while (entry) { PTR_TBL_ENT_t * const oentry = entry; entry = entry->next; del_pte(oentry); } } while (riter--); tbl->tbl_items = 0; } } /* clear and free a ptr table */ void Perl_ptr_table_free(pTHX_ PTR_TBL_t *tbl) { if (!tbl) { return; } ptr_table_clear(tbl); Safefree(tbl->tbl_ary); Safefree(tbl); } void Perl_rvpv_dup(pTHX_ SV *dstr, const SV *sstr, CLONE_PARAMS* param) { if (SvROK(sstr)) { SvRV_set(dstr, SvWEAKREF(sstr) ? sv_dup(SvRV(sstr), param) : sv_dup_inc(SvRV(sstr), param)); } else if (SvPVX_const(sstr)) { /* Has something there */ if (SvLEN(sstr)) { /* Normal PV - clone whole allocated space */ SvPV_set(dstr, SAVEPVN(SvPVX_const(sstr), SvLEN(sstr)-1)); if (SvREADONLY(sstr) && SvFAKE(sstr)) { /* Not that normal - actually sstr is copy on write. But we are a true, independant SV, so: */ SvREADONLY_off(dstr); SvFAKE_off(dstr); } } else { /* Special case - not normally malloced for some reason */ if (isGV_with_GP(sstr)) { /* Don't need to do anything here. */ } else if ((SvREADONLY(sstr) && SvFAKE(sstr))) { /* A "shared" PV - clone it as "shared" PV */ SvPV_set(dstr, HEK_KEY(hek_dup(SvSHARED_HEK_FROM_PV(SvPVX_const(sstr)), param))); } else { /* Some other special case - random pointer */ SvPV_set(dstr, SvPVX(sstr)); } } } else { /* Copy the NULL */ if (SvTYPE(dstr) == SVt_RV) SvRV_set(dstr, NULL); else SvPV_set(dstr, NULL); } } /* duplicate an SV of any type (including AV, HV etc) */ SV * Perl_sv_dup(pTHX_ const SV *sstr, CLONE_PARAMS* param) { dVAR; SV *dstr; if (!sstr || SvTYPE(sstr) == SVTYPEMASK) return NULL; /* look for it in the table first */ dstr = (SV*)ptr_table_fetch(PL_ptr_table, sstr); if (dstr) return dstr; if(param->flags & CLONEf_JOIN_IN) { /** We are joining here so we don't want do clone something that is bad **/ if (SvTYPE(sstr) == SVt_PVHV) { const char * const hvname = HvNAME_get(sstr); if (hvname) /** don't clone stashes if they already exist **/ return (SV*)gv_stashpv(hvname,0); } } /* create anew and remember what it is */ new_SV(dstr); #ifdef DEBUG_LEAKING_SCALARS dstr->sv_debug_optype = sstr->sv_debug_optype; dstr->sv_debug_line = sstr->sv_debug_line; dstr->sv_debug_inpad = sstr->sv_debug_inpad; dstr->sv_debug_cloned = 1; dstr->sv_debug_file = savepv(sstr->sv_debug_file); #endif ptr_table_store(PL_ptr_table, sstr, dstr); /* clone */ SvFLAGS(dstr) = SvFLAGS(sstr); SvFLAGS(dstr) &= ~SVf_OOK; /* don't propagate OOK hack */ SvREFCNT(dstr) = 0; /* must be before any other dups! */ #ifdef DEBUGGING if (SvANY(sstr) && PL_watch_pvx && SvPVX_const(sstr) == PL_watch_pvx) PerlIO_printf(Perl_debug_log, "watch at %p hit, found string \"%s\"\n", PL_watch_pvx, SvPVX_const(sstr)); #endif /* don't clone objects whose class has asked us not to */ if (SvOBJECT(sstr) && ! (SvFLAGS(SvSTASH(sstr)) & SVphv_CLONEABLE)) { SvFLAGS(dstr) &= ~SVTYPEMASK; SvOBJECT_off(dstr); return dstr; } switch (SvTYPE(sstr)) { case SVt_NULL: SvANY(dstr) = NULL; break; case SVt_IV: SvANY(dstr) = (XPVIV*)((char*)&(dstr->sv_u.svu_iv) - STRUCT_OFFSET(XPVIV, xiv_iv)); SvIV_set(dstr, SvIVX(sstr)); break; case SVt_NV: SvANY(dstr) = new_XNV(); SvNV_set(dstr, SvNVX(sstr)); break; case SVt_RV: SvANY(dstr) = &(dstr->sv_u.svu_rv); Perl_rvpv_dup(aTHX_ dstr, sstr, param); break; /* case SVt_BIND: */ default: { /* These are all the types that need complex bodies allocating. */ void *new_body; const svtype sv_type = SvTYPE(sstr); const struct body_details *const sv_type_details = bodies_by_type + sv_type; switch (sv_type) { default: Perl_croak(aTHX_ "Bizarre SvTYPE [%" IVdf "]", (IV)SvTYPE(sstr)); break; case SVt_PVGV: if (GvUNIQUE((GV*)sstr)) { NOOP; /* Do sharing here, and fall through */ } case SVt_PVIO: case SVt_PVFM: case SVt_PVHV: case SVt_PVAV: case SVt_PVCV: case SVt_PVLV: case SVt_PVMG: case SVt_PVNV: case SVt_PVIV: case SVt_PV: assert(sv_type_details->body_size); if (sv_type_details->arena) { new_body_inline(new_body, sv_type); new_body = (void*)((char*)new_body - sv_type_details->offset); } else { new_body = new_NOARENA(sv_type_details); } } assert(new_body); SvANY(dstr) = new_body; #ifndef PURIFY Copy(((char*)SvANY(sstr)) + sv_type_details->offset, ((char*)SvANY(dstr)) + sv_type_details->offset, sv_type_details->copy, char); #else Copy(((char*)SvANY(sstr)), ((char*)SvANY(dstr)), sv_type_details->body_size + sv_type_details->offset, char); #endif if (sv_type != SVt_PVAV && sv_type != SVt_PVHV && !isGV_with_GP(dstr)) Perl_rvpv_dup(aTHX_ dstr, sstr, param); /* The Copy above means that all the source (unduplicated) pointers are now in the destination. We can check the flags and the pointers in either, but it's possible that there's less cache missing by always going for the destination. FIXME - instrument and check that assumption */ if (sv_type >= SVt_PVMG) { if ((sv_type == SVt_PVMG) && SvPAD_OUR(dstr)) { OURSTASH_set(dstr, hv_dup_inc(OURSTASH(dstr), param)); } else if (SvMAGIC(dstr)) SvMAGIC_set(dstr, mg_dup(SvMAGIC(dstr), param)); if (SvSTASH(dstr)) SvSTASH_set(dstr, hv_dup_inc(SvSTASH(dstr), param)); } /* The cast silences a GCC warning about unhandled types. */ switch ((int)sv_type) { case SVt_PV: break; case SVt_PVIV: break; case SVt_PVNV: break; case SVt_PVMG: break; case SVt_PVLV: /* XXX LvTARGOFF sometimes holds PMOP* when DEBUGGING */ if (LvTYPE(dstr) == 't') /* for tie: unrefcnted fake (SV**) */ LvTARG(dstr) = dstr; else if (LvTYPE(dstr) == 'T') /* for tie: fake HE */ LvTARG(dstr) = (SV*)he_dup((HE*)LvTARG(dstr), 0, param); else LvTARG(dstr) = sv_dup_inc(LvTARG(dstr), param); break; case SVt_PVGV: if(isGV_with_GP(sstr)) { if (GvNAME_HEK(dstr)) GvNAME_HEK(dstr) = hek_dup(GvNAME_HEK(dstr), param); } /* Don't call sv_add_backref here as it's going to be created as part of the magic cloning of the symbol table. */ if(!SvVALID(dstr)) GvSTASH(dstr) = hv_dup(GvSTASH(dstr), param); if(isGV_with_GP(sstr)) { /* Danger Will Robinson - GvGP(dstr) isn't initialised at the point of this comment. */ GvGP(dstr) = gp_dup(GvGP(sstr), param); (void)GpREFCNT_inc(GvGP(dstr)); } else Perl_rvpv_dup(aTHX_ dstr, sstr, param); break; case SVt_PVIO: IoIFP(dstr) = fp_dup(IoIFP(dstr), IoTYPE(dstr), param); if (IoOFP(dstr) == IoIFP(sstr)) IoOFP(dstr) = IoIFP(dstr); else IoOFP(dstr) = fp_dup(IoOFP(dstr), IoTYPE(dstr), param); /* PL_rsfp_filters entries have fake IoDIRP() */ if(IoFLAGS(dstr) & IOf_FAKE_DIRP) { /* I have no idea why fake dirp (rsfps) should be treated differently but otherwise we end up with leaks -- sky*/ IoTOP_GV(dstr) = gv_dup_inc(IoTOP_GV(dstr), param); IoFMT_GV(dstr) = gv_dup_inc(IoFMT_GV(dstr), param); IoBOTTOM_GV(dstr) = gv_dup_inc(IoBOTTOM_GV(dstr), param); } else { IoTOP_GV(dstr) = gv_dup(IoTOP_GV(dstr), param); IoFMT_GV(dstr) = gv_dup(IoFMT_GV(dstr), param); IoBOTTOM_GV(dstr) = gv_dup(IoBOTTOM_GV(dstr), param); if (IoDIRP(dstr)) { IoDIRP(dstr) = dirp_dup(IoDIRP(dstr)); } else { NOOP; /* IoDIRP(dstr) is already a copy of IoDIRP(sstr) */ } } IoTOP_NAME(dstr) = SAVEPV(IoTOP_NAME(dstr)); IoFMT_NAME(dstr) = SAVEPV(IoFMT_NAME(dstr)); IoBOTTOM_NAME(dstr) = SAVEPV(IoBOTTOM_NAME(dstr)); break; case SVt_PVAV: if (AvARRAY((AV*)sstr)) { SV **dst_ary, **src_ary; SSize_t items = AvFILLp((AV*)sstr) + 1; src_ary = AvARRAY((AV*)sstr); Newxz(dst_ary, AvMAX((AV*)sstr)+1, SV*); ptr_table_store(PL_ptr_table, src_ary, dst_ary); AvARRAY((AV*)dstr) = dst_ary; AvALLOC((AV*)dstr) = dst_ary; if (AvREAL((AV*)sstr)) { while (items-- > 0) *dst_ary++ = sv_dup_inc(*src_ary++, param); } else { while (items-- > 0) *dst_ary++ = sv_dup(*src_ary++, param); } items = AvMAX((AV*)sstr) - AvFILLp((AV*)sstr); while (items-- > 0) { *dst_ary++ = &PL_sv_undef; } } else { AvARRAY((AV*)dstr) = NULL; AvALLOC((AV*)dstr) = (SV**)NULL; } break; case SVt_PVHV: if (HvARRAY((HV*)sstr)) { STRLEN i = 0; const bool sharekeys = !!HvSHAREKEYS(sstr); XPVHV * const dxhv = (XPVHV*)SvANY(dstr); XPVHV * const sxhv = (XPVHV*)SvANY(sstr); char *darray; Newx(darray, PERL_HV_ARRAY_ALLOC_BYTES(dxhv->xhv_max+1) + (SvOOK(sstr) ? sizeof(struct xpvhv_aux) : 0), char); HvARRAY(dstr) = (HE**)darray; while (i <= sxhv->xhv_max) { const HE * const source = HvARRAY(sstr)[i]; HvARRAY(dstr)[i] = source ? he_dup(source, sharekeys, param) : 0; ++i; } if (SvOOK(sstr)) { HEK *hvname; const struct xpvhv_aux * const saux = HvAUX(sstr); struct xpvhv_aux * const daux = HvAUX(dstr); /* This flag isn't copied. */ /* SvOOK_on(hv) attacks the IV flags. */ SvFLAGS(dstr) |= SVf_OOK; hvname = saux->xhv_name; daux->xhv_name = hvname ? hek_dup(hvname, param) : hvname; daux->xhv_riter = saux->xhv_riter; daux->xhv_eiter = saux->xhv_eiter ? he_dup(saux->xhv_eiter, (bool)!!HvSHAREKEYS(sstr), param) : 0; daux->xhv_backreferences = saux->xhv_backreferences ? (AV*) SvREFCNT_inc( sv_dup((SV*)saux->xhv_backreferences, param)) : 0; /* Record stashes for possible cloning in Perl_clone(). */ if (hvname) av_push(param->stashes, dstr); } } else HvARRAY((HV*)dstr) = NULL; break; case SVt_PVCV: if (!(param->flags & CLONEf_COPY_STACKS)) { CvDEPTH(dstr) = 0; } case SVt_PVFM: /* NOTE: not refcounted */ CvSTASH(dstr) = hv_dup(CvSTASH(dstr), param); OP_REFCNT_LOCK; if (!CvISXSUB(dstr)) CvROOT(dstr) = OpREFCNT_inc(CvROOT(dstr)); OP_REFCNT_UNLOCK; if (CvCONST(dstr) && CvISXSUB(dstr)) { CvXSUBANY(dstr).any_ptr = GvUNIQUE(CvGV(dstr)) ? SvREFCNT_inc(CvXSUBANY(dstr).any_ptr) : sv_dup_inc((SV *)CvXSUBANY(dstr).any_ptr, param); } /* don't dup if copying back - CvGV isn't refcounted, so the * duped GV may never be freed. A bit of a hack! DAPM */ CvGV(dstr) = (param->flags & CLONEf_JOIN_IN) ? NULL : gv_dup(CvGV(dstr), param) ; PAD_DUP(CvPADLIST(dstr), CvPADLIST(sstr), param); CvOUTSIDE(dstr) = CvWEAKOUTSIDE(sstr) ? cv_dup( CvOUTSIDE(dstr), param) : cv_dup_inc(CvOUTSIDE(dstr), param); if (!CvISXSUB(dstr)) CvFILE(dstr) = SAVEPV(CvFILE(dstr)); break; } } } if (SvOBJECT(dstr) && SvTYPE(dstr) != SVt_PVIO) ++PL_sv_objcount; return dstr; } /* duplicate a context */ PERL_CONTEXT * Perl_cx_dup(pTHX_ PERL_CONTEXT *cxs, I32 ix, I32 max, CLONE_PARAMS* param) { PERL_CONTEXT *ncxs; if (!cxs) return (PERL_CONTEXT*)NULL; /* look for it in the table first */ ncxs = (PERL_CONTEXT*)ptr_table_fetch(PL_ptr_table, cxs); if (ncxs) return ncxs; /* create anew and remember what it is */ Newxz(ncxs, max + 1, PERL_CONTEXT); ptr_table_store(PL_ptr_table, cxs, ncxs); while (ix >= 0) { PERL_CONTEXT * const cx = &cxs[ix]; PERL_CONTEXT * const ncx = &ncxs[ix]; ncx->cx_type = cx->cx_type; if (CxTYPE(cx) == CXt_SUBST) { Perl_croak(aTHX_ "Cloning substitution context is unimplemented"); } else { ncx->blk_oldsp = cx->blk_oldsp; ncx->blk_oldcop = cx->blk_oldcop; ncx->blk_oldmarksp = cx->blk_oldmarksp; ncx->blk_oldscopesp = cx->blk_oldscopesp; ncx->blk_oldpm = cx->blk_oldpm; ncx->blk_gimme = cx->blk_gimme; switch (CxTYPE(cx)) { case CXt_SUB: ncx->blk_sub.cv = (cx->blk_sub.olddepth == 0 ? cv_dup_inc(cx->blk_sub.cv, param) : cv_dup(cx->blk_sub.cv,param)); ncx->blk_sub.argarray = (cx->blk_sub.hasargs ? av_dup_inc(cx->blk_sub.argarray, param) : NULL); ncx->blk_sub.savearray = av_dup_inc(cx->blk_sub.savearray, param); ncx->blk_sub.olddepth = cx->blk_sub.olddepth; ncx->blk_sub.hasargs = cx->blk_sub.hasargs; ncx->blk_sub.lval = cx->blk_sub.lval; ncx->blk_sub.retop = cx->blk_sub.retop; ncx->blk_sub.oldcomppad = (PAD*)ptr_table_fetch(PL_ptr_table, cx->blk_sub.oldcomppad); break; case CXt_EVAL: ncx->blk_eval.old_in_eval = cx->blk_eval.old_in_eval; ncx->blk_eval.old_op_type = cx->blk_eval.old_op_type; ncx->blk_eval.old_namesv = sv_dup_inc(cx->blk_eval.old_namesv, param); ncx->blk_eval.old_eval_root = cx->blk_eval.old_eval_root; ncx->blk_eval.cur_text = sv_dup(cx->blk_eval.cur_text, param); ncx->blk_eval.retop = cx->blk_eval.retop; break; case CXt_LOOP: ncx->blk_loop.label = cx->blk_loop.label; ncx->blk_loop.resetsp = cx->blk_loop.resetsp; ncx->blk_loop.my_op = cx->blk_loop.my_op; ncx->blk_loop.iterdata = (CxPADLOOP(cx) ? cx->blk_loop.iterdata : gv_dup((GV*)cx->blk_loop.iterdata, param)); ncx->blk_loop.oldcomppad = (PAD*)ptr_table_fetch(PL_ptr_table, cx->blk_loop.oldcomppad); ncx->blk_loop.itersave = sv_dup_inc(cx->blk_loop.itersave, param); ncx->blk_loop.iterlval = sv_dup_inc(cx->blk_loop.iterlval, param); ncx->blk_loop.iterary = av_dup_inc(cx->blk_loop.iterary, param); ncx->blk_loop.iterix = cx->blk_loop.iterix; ncx->blk_loop.itermax = cx->blk_loop.itermax; break; case CXt_FORMAT: ncx->blk_sub.cv = cv_dup(cx->blk_sub.cv, param); ncx->blk_sub.gv = gv_dup(cx->blk_sub.gv, param); ncx->blk_sub.dfoutgv = gv_dup_inc(cx->blk_sub.dfoutgv, param); ncx->blk_sub.hasargs = cx->blk_sub.hasargs; ncx->blk_sub.retop = cx->blk_sub.retop; break; case CXt_BLOCK: case CXt_NULL: break; } } --ix; } return ncxs; } /* duplicate a stack info structure */ PERL_SI * Perl_si_dup(pTHX_ PERL_SI *si, CLONE_PARAMS* param) { PERL_SI *nsi; if (!si) return (PERL_SI*)NULL; /* look for it in the table first */ nsi = (PERL_SI*)ptr_table_fetch(PL_ptr_table, si); if (nsi) return nsi; /* create anew and remember what it is */ Newxz(nsi, 1, PERL_SI); ptr_table_store(PL_ptr_table, si, nsi); nsi->si_stack = av_dup_inc(si->si_stack, param); nsi->si_cxix = si->si_cxix; nsi->si_cxmax = si->si_cxmax; nsi->si_cxstack = cx_dup(si->si_cxstack, si->si_cxix, si->si_cxmax, param); nsi->si_type = si->si_type; nsi->si_prev = si_dup(si->si_prev, param); nsi->si_next = si_dup(si->si_next, param); nsi->si_markoff = si->si_markoff; return nsi; } #define POPINT(ss,ix) ((ss)[--(ix)].any_i32) #define TOPINT(ss,ix) ((ss)[ix].any_i32) #define POPLONG(ss,ix) ((ss)[--(ix)].any_long) #define TOPLONG(ss,ix) ((ss)[ix].any_long) #define POPIV(ss,ix) ((ss)[--(ix)].any_iv) #define TOPIV(ss,ix) ((ss)[ix].any_iv) #define POPBOOL(ss,ix) ((ss)[--(ix)].any_bool) #define TOPBOOL(ss,ix) ((ss)[ix].any_bool) #define POPPTR(ss,ix) ((ss)[--(ix)].any_ptr) #define TOPPTR(ss,ix) ((ss)[ix].any_ptr) #define POPDPTR(ss,ix) ((ss)[--(ix)].any_dptr) #define TOPDPTR(ss,ix) ((ss)[ix].any_dptr) #define POPDXPTR(ss,ix) ((ss)[--(ix)].any_dxptr) #define TOPDXPTR(ss,ix) ((ss)[ix].any_dxptr) /* XXXXX todo */ #define pv_dup_inc(p) SAVEPV(p) #define pv_dup(p) SAVEPV(p) #define svp_dup_inc(p,pp) any_dup(p,pp) /* map any object to the new equivent - either something in the * ptr table, or something in the interpreter structure */ void * Perl_any_dup(pTHX_ void *v, const PerlInterpreter *proto_perl) { void *ret; if (!v) return (void*)NULL; /* look for it in the table first */ ret = ptr_table_fetch(PL_ptr_table, v); if (ret) return ret; /* see if it is part of the interpreter structure */ if (v >= (void*)proto_perl && v < (void*)(proto_perl+1)) ret = (void*)(((char*)aTHX) + (((char*)v) - (char*)proto_perl)); else { ret = v; } return ret; } /* duplicate the save stack */ ANY * Perl_ss_dup(pTHX_ PerlInterpreter *proto_perl, CLONE_PARAMS* param) { dVAR; ANY * const ss = proto_perl->Tsavestack; const I32 max = proto_perl->Tsavestack_max; I32 ix = proto_perl->Tsavestack_ix; ANY *nss; SV *sv; GV *gv; AV *av; HV *hv; void* ptr; int intval; long longval; GP *gp; IV iv; I32 i; char *c = NULL; void (*dptr) (void*); void (*dxptr) (pTHX_ void*); Newxz(nss, max, ANY); while (ix > 0) { const I32 type = POPINT(ss,ix); TOPINT(nss,ix) = type; switch (type) { case SAVEt_HELEM: /* hash element */ sv = (SV*)POPPTR(ss,ix); TOPPTR(nss,ix) = sv_dup_inc(sv, param); /* fall through */ case SAVEt_ITEM: /* normal string */ case SAVEt_SV: /* scalar reference */ sv = (SV*)POPPTR(ss,ix); TOPPTR(nss,ix) = sv_dup_inc(sv, param); /* fall through */ case SAVEt_FREESV: case SAVEt_MORTALIZESV: sv = (SV*)POPPTR(ss,ix); TOPPTR(nss,ix) = sv_dup_inc(sv, param); break; case SAVEt_SHARED_PVREF: /* char* in shared space */ c = (char*)POPPTR(ss,ix); TOPPTR(nss,ix) = savesharedpv(c); ptr = POPPTR(ss,ix); TOPPTR(nss,ix) = any_dup(ptr, proto_perl); break; case SAVEt_GENERIC_SVREF: /* generic sv */ case SAVEt_SVREF: /* scalar reference */ sv = (SV*)POPPTR(ss,ix); TOPPTR(nss,ix) = sv_dup_inc(sv, param); ptr = POPPTR(ss,ix); TOPPTR(nss,ix) = svp_dup_inc((SV**)ptr, proto_perl);/* XXXXX */ break; case SAVEt_HV: /* hash reference */ case SAVEt_AV: /* array reference */ sv = (SV*) POPPTR(ss,ix); TOPPTR(nss,ix) = sv_dup_inc(sv, param); /* fall through */ case SAVEt_COMPPAD: case SAVEt_NSTAB: sv = (SV*) POPPTR(ss,ix); TOPPTR(nss,ix) = sv_dup(sv, param); break; case SAVEt_INT: /* int reference */ ptr = POPPTR(ss,ix); TOPPTR(nss,ix) = any_dup(ptr, proto_perl); intval = (int)POPINT(ss,ix); TOPINT(nss,ix) = intval; break; case SAVEt_LONG: /* long reference */ ptr = POPPTR(ss,ix); TOPPTR(nss,ix) = any_dup(ptr, proto_perl); /* fall through */ case SAVEt_CLEARSV: longval = (long)POPLONG(ss,ix); TOPLONG(nss,ix) = longval; break; case SAVEt_I32: /* I32 reference */ case SAVEt_I16: /* I16 reference */ case SAVEt_I8: /* I8 reference */ case SAVEt_COP_ARYBASE: /* call CopARYBASE_set */ ptr = POPPTR(ss,ix); TOPPTR(nss,ix) = any_dup(ptr, proto_perl); i = POPINT(ss,ix); TOPINT(nss,ix) = i; break; case SAVEt_IV: /* IV reference */ ptr = POPPTR(ss,ix); TOPPTR(nss,ix) = any_dup(ptr, proto_perl); iv = POPIV(ss,ix); TOPIV(nss,ix) = iv; break; case SAVEt_HPTR: /* HV* reference */ case SAVEt_APTR: /* AV* reference */ case SAVEt_SPTR: /* SV* reference */ ptr = POPPTR(ss,ix); TOPPTR(nss,ix) = any_dup(ptr, proto_perl); sv = (SV*)POPPTR(ss,ix); TOPPTR(nss,ix) = sv_dup(sv, param); break; case SAVEt_VPTR: /* random* reference */ ptr = POPPTR(ss,ix); TOPPTR(nss,ix) = any_dup(ptr, proto_perl); ptr = POPPTR(ss,ix); TOPPTR(nss,ix) = any_dup(ptr, proto_perl); break; case SAVEt_GENERIC_PVREF: /* generic char* */ case SAVEt_PPTR: /* char* reference */ ptr = POPPTR(ss,ix); TOPPTR(nss,ix) = any_dup(ptr, proto_perl); c = (char*)POPPTR(ss,ix); TOPPTR(nss,ix) = pv_dup(c); break; case SAVEt_GP: /* scalar reference */ gp = (GP*)POPPTR(ss,ix); TOPPTR(nss,ix) = gp = gp_dup(gp, param); (void)GpREFCNT_inc(gp); gv = (GV*)POPPTR(ss,ix); TOPPTR(nss,ix) = gv_dup_inc(gv, param); break; case SAVEt_FREEOP: ptr = POPPTR(ss,ix); if (ptr && (((OP*)ptr)->op_private & OPpREFCOUNTED)) { /* these are assumed to be refcounted properly */ OP *o; switch (((OP*)ptr)->op_type) { case OP_LEAVESUB: case OP_LEAVESUBLV: case OP_LEAVEEVAL: case OP_LEAVE: case OP_SCOPE: case OP_LEAVEWRITE: TOPPTR(nss,ix) = ptr; o = (OP*)ptr; OP_REFCNT_LOCK; OpREFCNT_inc(o); OP_REFCNT_UNLOCK; break; default: TOPPTR(nss,ix) = NULL; break; } } else TOPPTR(nss,ix) = NULL; break; case SAVEt_FREEPV: c = (char*)POPPTR(ss,ix); TOPPTR(nss,ix) = pv_dup_inc(c); break; case SAVEt_DELETE: hv = (HV*)POPPTR(ss,ix); TOPPTR(nss,ix) = hv_dup_inc(hv, param); c = (char*)POPPTR(ss,ix); TOPPTR(nss,ix) = pv_dup_inc(c); /* fall through */ case SAVEt_STACK_POS: /* Position on Perl stack */ i = POPINT(ss,ix); TOPINT(nss,ix) = i; break; case SAVEt_DESTRUCTOR: ptr = POPPTR(ss,ix); TOPPTR(nss,ix) = any_dup(ptr, proto_perl); /* XXX quite arbitrary */ dptr = POPDPTR(ss,ix); TOPDPTR(nss,ix) = DPTR2FPTR(void (*)(void*), any_dup(FPTR2DPTR(void *, dptr), proto_perl)); break; case SAVEt_DESTRUCTOR_X: ptr = POPPTR(ss,ix); TOPPTR(nss,ix) = any_dup(ptr, proto_perl); /* XXX quite arbitrary */ dxptr = POPDXPTR(ss,ix); TOPDXPTR(nss,ix) = DPTR2FPTR(void (*)(pTHX_ void*), any_dup(FPTR2DPTR(void *, dxptr), proto_perl)); break; case SAVEt_REGCONTEXT: case SAVEt_ALLOC: i = POPINT(ss,ix); TOPINT(nss,ix) = i; ix -= i; break; case SAVEt_AELEM: /* array element */ sv = (SV*)POPPTR(ss,ix); TOPPTR(nss,ix) = sv_dup_inc(sv, param); i = POPINT(ss,ix); TOPINT(nss,ix) = i; av = (AV*)POPPTR(ss,ix); TOPPTR(nss,ix) = av_dup_inc(av, param); break; case SAVEt_OP: ptr = POPPTR(ss,ix); TOPPTR(nss,ix) = ptr; break; case SAVEt_HINTS: i = POPINT(ss,ix); TOPINT(nss,ix) = i; ptr = POPPTR(ss,ix); if (ptr) { HINTS_REFCNT_LOCK; ((struct refcounted_he *)ptr)->refcounted_he_refcnt++; HINTS_REFCNT_UNLOCK; } TOPPTR(nss,ix) = ptr; if (i & HINT_LOCALIZE_HH) { hv = (HV*)POPPTR(ss,ix); TOPPTR(nss,ix) = hv_dup_inc(hv, param); } break; case SAVEt_PADSV: longval = (long)POPLONG(ss,ix); TOPLONG(nss,ix) = longval; ptr = POPPTR(ss,ix); TOPPTR(nss,ix) = any_dup(ptr, proto_perl); sv = (SV*)POPPTR(ss,ix); TOPPTR(nss,ix) = sv_dup(sv, param); break; case SAVEt_BOOL: ptr = POPPTR(ss,ix); TOPPTR(nss,ix) = any_dup(ptr, proto_perl); longval = (long)POPBOOL(ss,ix); TOPBOOL(nss,ix) = (bool)longval; break; case SAVEt_SET_SVFLAGS: i = POPINT(ss,ix); TOPINT(nss,ix) = i; i = POPINT(ss,ix); TOPINT(nss,ix) = i; sv = (SV*)POPPTR(ss,ix); TOPPTR(nss,ix) = sv_dup(sv, param); break; case SAVEt_RE_STATE: { const struct re_save_state *const old_state = (struct re_save_state *) (ss + ix - SAVESTACK_ALLOC_FOR_RE_SAVE_STATE); struct re_save_state *const new_state = (struct re_save_state *) (nss + ix - SAVESTACK_ALLOC_FOR_RE_SAVE_STATE); Copy(old_state, new_state, 1, struct re_save_state); ix -= SAVESTACK_ALLOC_FOR_RE_SAVE_STATE; new_state->re_state_bostr = pv_dup(old_state->re_state_bostr); new_state->re_state_reginput = pv_dup(old_state->re_state_reginput); new_state->re_state_regeol = pv_dup(old_state->re_state_regeol); new_state->re_state_regstartp = (I32*) any_dup(old_state->re_state_regstartp, proto_perl); new_state->re_state_regendp = (I32*) any_dup(old_state->re_state_regendp, proto_perl); new_state->re_state_reglastparen = (U32*) any_dup(old_state->re_state_reglastparen, proto_perl); new_state->re_state_reglastcloseparen = (U32*)any_dup(old_state->re_state_reglastcloseparen, proto_perl); /* XXX This just has to be broken. The old save_re_context code did SAVEGENERICPV(PL_reg_start_tmp); PL_reg_start_tmp is char **. Look above to what the dup code does for SAVEt_GENERIC_PVREF It can never have worked. So this is merely a faithful copy of the exiting bug: */ new_state->re_state_reg_start_tmp = (char **) pv_dup((char *) old_state->re_state_reg_start_tmp); /* I assume that it only ever "worked" because no-one called (pseudo)fork while the regexp engine had re-entered itself. */ #ifdef PERL_OLD_COPY_ON_WRITE new_state->re_state_nrs = sv_dup(old_state->re_state_nrs, param); #endif new_state->re_state_reg_magic = (MAGIC*) any_dup(old_state->re_state_reg_magic, proto_perl); new_state->re_state_reg_oldcurpm = (PMOP*) any_dup(old_state->re_state_reg_oldcurpm, proto_perl); new_state->re_state_reg_curpm = (PMOP*) any_dup(old_state->re_state_reg_curpm, proto_perl); new_state->re_state_reg_oldsaved = pv_dup(old_state->re_state_reg_oldsaved); new_state->re_state_reg_poscache = pv_dup(old_state->re_state_reg_poscache); new_state->re_state_reg_starttry = pv_dup(old_state->re_state_reg_starttry); break; } case SAVEt_COMPILE_WARNINGS: ptr = POPPTR(ss,ix); TOPPTR(nss,ix) = DUP_WARNINGS((STRLEN*)ptr); break; default: Perl_croak(aTHX_ "panic: ss_dup inconsistency (%"IVdf")", (IV) type); } } return nss; } /* if sv is a stash, call $class->CLONE_SKIP(), and set the SVphv_CLONEABLE * flag to the result. This is done for each stash before cloning starts, * so we know which stashes want their objects cloned */ static void do_mark_cloneable_stash(pTHX_ SV *sv) { const HEK * const hvname = HvNAME_HEK((HV*)sv); if (hvname) { GV* const cloner = gv_fetchmethod_autoload((HV*)sv, "CLONE_SKIP", 0); SvFLAGS(sv) |= SVphv_CLONEABLE; /* clone objects by default */ if (cloner && GvCV(cloner)) { dSP; UV status; ENTER; SAVETMPS; PUSHMARK(SP); XPUSHs(sv_2mortal(newSVhek(hvname))); PUTBACK; call_sv((SV*)GvCV(cloner), G_SCALAR); SPAGAIN; status = POPu; PUTBACK; FREETMPS; LEAVE; if (status) SvFLAGS(sv) &= ~SVphv_CLONEABLE; } } } /* =for apidoc perl_clone Create and return a new interpreter by cloning the current one. perl_clone takes these flags as parameters: CLONEf_COPY_STACKS - is used to, well, copy the stacks also, without it we only clone the data and zero the stacks, with it we copy the stacks and the new perl interpreter is ready to run at the exact same point as the previous one. The pseudo-fork code uses COPY_STACKS while the threads->new doesn't. CLONEf_KEEP_PTR_TABLE perl_clone keeps a ptr_table with the pointer of the old variable as a key and the new variable as a value, this allows it to check if something has been cloned and not clone it again but rather just use the value and increase the refcount. If KEEP_PTR_TABLE is not set then perl_clone will kill the ptr_table using the function C, reason to keep it around is if you want to dup some of your own variable who are outside the graph perl scans, example of this code is in threads.xs create CLONEf_CLONE_HOST This is a win32 thing, it is ignored on unix, it tells perls win32host code (which is c++) to clone itself, this is needed on win32 if you want to run two threads at the same time, if you just want to do some stuff in a separate perl interpreter and then throw it away and return to the original one, you don't need to do anything. =cut */ /* XXX the above needs expanding by someone who actually understands it ! */ EXTERN_C PerlInterpreter * perl_clone_host(PerlInterpreter* proto_perl, UV flags); PerlInterpreter * perl_clone(PerlInterpreter *proto_perl, UV flags) { dVAR; #ifdef PERL_IMPLICIT_SYS /* perlhost.h so we need to call into it to clone the host, CPerlHost should have a c interface, sky */ if (flags & CLONEf_CLONE_HOST) { return perl_clone_host(proto_perl,flags); } return perl_clone_using(proto_perl, flags, proto_perl->IMem, proto_perl->IMemShared, proto_perl->IMemParse, proto_perl->IEnv, proto_perl->IStdIO, proto_perl->ILIO, proto_perl->IDir, proto_perl->ISock, proto_perl->IProc); } PerlInterpreter * perl_clone_using(PerlInterpreter *proto_perl, UV flags, struct IPerlMem* ipM, struct IPerlMem* ipMS, struct IPerlMem* ipMP, struct IPerlEnv* ipE, struct IPerlStdIO* ipStd, struct IPerlLIO* ipLIO, struct IPerlDir* ipD, struct IPerlSock* ipS, struct IPerlProc* ipP) { /* XXX many of the string copies here can be optimized if they're * constants; they need to be allocated as common memory and just * their pointers copied. */ IV i; CLONE_PARAMS clone_params; CLONE_PARAMS* const param = &clone_params; PerlInterpreter * const my_perl = (PerlInterpreter*)(*ipM->pMalloc)(ipM, sizeof(PerlInterpreter)); /* for each stash, determine whether its objects should be cloned */ S_visit(proto_perl, do_mark_cloneable_stash, SVt_PVHV, SVTYPEMASK); PERL_SET_THX(my_perl); # ifdef DEBUGGING PoisonNew(my_perl, 1, PerlInterpreter); PL_op = NULL; PL_curcop = NULL; PL_markstack = 0; PL_scopestack = 0; PL_savestack = 0; PL_savestack_ix = 0; PL_savestack_max = -1; PL_sig_pending = 0; Zero(&PL_debug_pad, 1, struct perl_debug_pad); # else /* !DEBUGGING */ Zero(my_perl, 1, PerlInterpreter); # endif /* DEBUGGING */ /* host pointers */ PL_Mem = ipM; PL_MemShared = ipMS; PL_MemParse = ipMP; PL_Env = ipE; PL_StdIO = ipStd; PL_LIO = ipLIO; PL_Dir = ipD; PL_Sock = ipS; PL_Proc = ipP; #else /* !PERL_IMPLICIT_SYS */ IV i; CLONE_PARAMS clone_params; CLONE_PARAMS* param = &clone_params; PerlInterpreter * const my_perl = (PerlInterpreter*)PerlMem_malloc(sizeof(PerlInterpreter)); /* for each stash, determine whether its objects should be cloned */ S_visit(proto_perl, do_mark_cloneable_stash, SVt_PVHV, SVTYPEMASK); PERL_SET_THX(my_perl); # ifdef DEBUGGING PoisonNew(my_perl, 1, PerlInterpreter); PL_op = NULL; PL_curcop = NULL; PL_markstack = 0; PL_scopestack = 0; PL_savestack = 0; PL_savestack_ix = 0; PL_savestack_max = -1; PL_sig_pending = 0; Zero(&PL_debug_pad, 1, struct perl_debug_pad); # else /* !DEBUGGING */ Zero(my_perl, 1, PerlInterpreter); # endif /* DEBUGGING */ #endif /* PERL_IMPLICIT_SYS */ param->flags = flags; param->proto_perl = proto_perl; INIT_TRACK_MEMPOOL(my_perl->Imemory_debug_header, my_perl); PL_body_arenas = NULL; Zero(&PL_body_roots, 1, PL_body_roots); PL_nice_chunk = NULL; PL_nice_chunk_size = 0; PL_sv_count = 0; PL_sv_objcount = 0; PL_sv_root = NULL; PL_sv_arenaroot = NULL; PL_debug = proto_perl->Idebug; PL_hash_seed = proto_perl->Ihash_seed; PL_rehash_seed = proto_perl->Irehash_seed; #ifdef USE_REENTRANT_API /* XXX: things like -Dm will segfault here in perlio, but doing * PERL_SET_CONTEXT(proto_perl); * breaks too many other things */ Perl_reentrant_init(aTHX); #endif /* create SV map for pointer relocation */ PL_ptr_table = ptr_table_new(); /* initialize these special pointers as early as possible */ SvANY(&PL_sv_undef) = NULL; SvREFCNT(&PL_sv_undef) = (~(U32)0)/2; SvFLAGS(&PL_sv_undef) = SVf_READONLY|SVt_NULL; ptr_table_store(PL_ptr_table, &proto_perl->Isv_undef, &PL_sv_undef); SvANY(&PL_sv_no) = new_XPVNV(); SvREFCNT(&PL_sv_no) = (~(U32)0)/2; SvFLAGS(&PL_sv_no) = SVp_IOK|SVf_IOK|SVp_NOK|SVf_NOK |SVp_POK|SVf_POK|SVf_READONLY|SVt_PVNV; SvPV_set(&PL_sv_no, savepvn(PL_No, 0)); SvCUR_set(&PL_sv_no, 0); SvLEN_set(&PL_sv_no, 1); SvIV_set(&PL_sv_no, 0); SvNV_set(&PL_sv_no, 0); ptr_table_store(PL_ptr_table, &proto_perl->Isv_no, &PL_sv_no); SvANY(&PL_sv_yes) = new_XPVNV(); SvREFCNT(&PL_sv_yes) = (~(U32)0)/2; SvFLAGS(&PL_sv_yes) = SVp_IOK|SVf_IOK|SVp_NOK|SVf_NOK |SVp_POK|SVf_POK|SVf_READONLY|SVt_PVNV; SvPV_set(&PL_sv_yes, savepvn(PL_Yes, 1)); SvCUR_set(&PL_sv_yes, 1); SvLEN_set(&PL_sv_yes, 2); SvIV_set(&PL_sv_yes, 1); SvNV_set(&PL_sv_yes, 1); ptr_table_store(PL_ptr_table, &proto_perl->Isv_yes, &PL_sv_yes); /* create (a non-shared!) shared string table */ PL_strtab = newHV(); HvSHAREKEYS_off(PL_strtab); hv_ksplit(PL_strtab, HvTOTALKEYS(proto_perl->Istrtab)); ptr_table_store(PL_ptr_table, proto_perl->Istrtab, PL_strtab); PL_compiling = proto_perl->Icompiling; /* These two PVs will be free'd special way so must set them same way op.c does */ PL_compiling.cop_stashpv = savesharedpv(PL_compiling.cop_stashpv); ptr_table_store(PL_ptr_table, proto_perl->Icompiling.cop_stashpv, PL_compiling.cop_stashpv); PL_compiling.cop_file = savesharedpv(PL_compiling.cop_file); ptr_table_store(PL_ptr_table, proto_perl->Icompiling.cop_file, PL_compiling.cop_file); ptr_table_store(PL_ptr_table, &proto_perl->Icompiling, &PL_compiling); PL_compiling.cop_warnings = DUP_WARNINGS(PL_compiling.cop_warnings); if (PL_compiling.cop_hints_hash) { HINTS_REFCNT_LOCK; PL_compiling.cop_hints_hash->refcounted_he_refcnt++; HINTS_REFCNT_UNLOCK; } PL_curcop = (COP*)any_dup(proto_perl->Tcurcop, proto_perl); /* pseudo environmental stuff */ PL_origargc = proto_perl->Iorigargc; PL_origargv = proto_perl->Iorigargv; param->stashes = newAV(); /* Setup array of objects to call clone on */ /* Set tainting stuff before PerlIO_debug can possibly get called */ PL_tainting = proto_perl->Itainting; PL_taint_warn = proto_perl->Itaint_warn; #ifdef PERLIO_LAYERS /* Clone PerlIO tables as soon as we can handle general xx_dup() */ PerlIO_clone(aTHX_ proto_perl, param); #endif PL_envgv = gv_dup(proto_perl->Ienvgv, param); PL_incgv = gv_dup(proto_perl->Iincgv, param); PL_hintgv = gv_dup(proto_perl->Ihintgv, param); PL_origfilename = SAVEPV(proto_perl->Iorigfilename); PL_diehook = sv_dup_inc(proto_perl->Idiehook, param); PL_warnhook = sv_dup_inc(proto_perl->Iwarnhook, param); /* switches */ PL_minus_c = proto_perl->Iminus_c; PL_patchlevel = sv_dup_inc(proto_perl->Ipatchlevel, param); PL_localpatches = proto_perl->Ilocalpatches; PL_splitstr = proto_perl->Isplitstr; PL_preprocess = proto_perl->Ipreprocess; PL_minus_n = proto_perl->Iminus_n; PL_minus_p = proto_perl->Iminus_p; PL_minus_l = proto_perl->Iminus_l; PL_minus_a = proto_perl->Iminus_a; PL_minus_E = proto_perl->Iminus_E; PL_minus_F = proto_perl->Iminus_F; PL_doswitches = proto_perl->Idoswitches; PL_dowarn = proto_perl->Idowarn; PL_doextract = proto_perl->Idoextract; PL_sawampersand = proto_perl->Isawampersand; PL_unsafe = proto_perl->Iunsafe; PL_inplace = SAVEPV(proto_perl->Iinplace); PL_e_script = sv_dup_inc(proto_perl->Ie_script, param); PL_perldb = proto_perl->Iperldb; PL_perl_destruct_level = proto_perl->Iperl_destruct_level; PL_exit_flags = proto_perl->Iexit_flags; /* magical thingies */ /* XXX time(&PL_basetime) when asked for? */ PL_basetime = proto_perl->Ibasetime; PL_formfeed = sv_dup(proto_perl->Iformfeed, param); PL_maxsysfd = proto_perl->Imaxsysfd; PL_statusvalue = proto_perl->Istatusvalue; #ifdef VMS PL_statusvalue_vms = proto_perl->Istatusvalue_vms; #else PL_statusvalue_posix = proto_perl->Istatusvalue_posix; #endif PL_encoding = sv_dup(proto_perl->Iencoding, param); sv_setpvn(PERL_DEBUG_PAD(0), "", 0); /* For regex debugging. */ sv_setpvn(PERL_DEBUG_PAD(1), "", 0); /* ext/re needs these */ sv_setpvn(PERL_DEBUG_PAD(2), "", 0); /* even without DEBUGGING. */ /* RE engine related */ Zero(&PL_reg_state, 1, struct re_save_state); PL_reginterp_cnt = 0; PL_regmatch_slab = NULL; /* Clone the regex array */ PL_regex_padav = newAV(); { const I32 len = av_len((AV*)proto_perl->Iregex_padav); SV* const * const regexen = AvARRAY((AV*)proto_perl->Iregex_padav); IV i; av_push(PL_regex_padav, sv_dup_inc_NN(regexen[0],param)); for(i = 1; i <= len; i++) { const SV * const regex = regexen[i]; SV * const sv = SvREPADTMP(regex) ? sv_dup_inc(regex, param) : SvREFCNT_inc( newSViv(PTR2IV(CALLREGDUPE( INT2PTR(REGEXP *, SvIVX(regex)), param)))) ; av_push(PL_regex_padav, sv); } } PL_regex_pad = AvARRAY(PL_regex_padav); /* shortcuts to various I/O objects */ PL_stdingv = gv_dup(proto_perl->Istdingv, param); PL_stderrgv = gv_dup(proto_perl->Istderrgv, param); PL_defgv = gv_dup(proto_perl->Idefgv, param); PL_argvgv = gv_dup(proto_perl->Iargvgv, param); PL_argvoutgv = gv_dup(proto_perl->Iargvoutgv, param); PL_argvout_stack = av_dup_inc(proto_perl->Iargvout_stack, param); /* shortcuts to regexp stuff */ PL_replgv = gv_dup(proto_perl->Ireplgv, param); /* shortcuts to misc objects */ PL_errgv = gv_dup(proto_perl->Ierrgv, param); /* shortcuts to debugging objects */ PL_DBgv = gv_dup(proto_perl->IDBgv, param); PL_DBline = gv_dup(proto_perl->IDBline, param); PL_DBsub = gv_dup(proto_perl->IDBsub, param); PL_DBsingle = sv_dup(proto_perl->IDBsingle, param); PL_DBtrace = sv_dup(proto_perl->IDBtrace, param); PL_DBsignal = sv_dup(proto_perl->IDBsignal, param); PL_DBassertion = sv_dup(proto_perl->IDBassertion, param); PL_lineary = av_dup(proto_perl->Ilineary, param); PL_dbargs = av_dup(proto_perl->Idbargs, param); /* symbol tables */ PL_defstash = hv_dup_inc(proto_perl->Tdefstash, param); PL_curstash = hv_dup(proto_perl->Tcurstash, param); PL_debstash = hv_dup(proto_perl->Idebstash, param); PL_globalstash = hv_dup(proto_perl->Iglobalstash, param); PL_curstname = sv_dup_inc(proto_perl->Icurstname, param); PL_beginav = av_dup_inc(proto_perl->Ibeginav, param); PL_beginav_save = av_dup_inc(proto_perl->Ibeginav_save, param); PL_checkav_save = av_dup_inc(proto_perl->Icheckav_save, param); PL_unitcheckav = av_dup_inc(proto_perl->Iunitcheckav, param); PL_unitcheckav_save = av_dup_inc(proto_perl->Iunitcheckav_save, param); PL_endav = av_dup_inc(proto_perl->Iendav, param); PL_checkav = av_dup_inc(proto_perl->Icheckav, param); PL_initav = av_dup_inc(proto_perl->Iinitav, param); PL_sub_generation = proto_perl->Isub_generation; /* funky return mechanisms */ PL_forkprocess = proto_perl->Iforkprocess; /* subprocess state */ PL_fdpid = av_dup_inc(proto_perl->Ifdpid, param); /* internal state */ PL_maxo = proto_perl->Imaxo; if (proto_perl->Iop_mask) PL_op_mask = SAVEPVN(proto_perl->Iop_mask, PL_maxo); else PL_op_mask = NULL; /* PL_asserting = proto_perl->Iasserting; */ /* current interpreter roots */ PL_main_cv = cv_dup_inc(proto_perl->Imain_cv, param); OP_REFCNT_LOCK; PL_main_root = OpREFCNT_inc(proto_perl->Imain_root); OP_REFCNT_UNLOCK; PL_main_start = proto_perl->Imain_start; PL_eval_root = proto_perl->Ieval_root; PL_eval_start = proto_perl->Ieval_start; /* runtime control stuff */ PL_curcopdb = (COP*)any_dup(proto_perl->Icurcopdb, proto_perl); PL_copline = proto_perl->Icopline; PL_filemode = proto_perl->Ifilemode; PL_lastfd = proto_perl->Ilastfd; PL_oldname = proto_perl->Ioldname; /* XXX not quite right */ PL_Argv = NULL; PL_Cmd = NULL; PL_gensym = proto_perl->Igensym; PL_preambled = proto_perl->Ipreambled; PL_preambleav = av_dup_inc(proto_perl->Ipreambleav, param); PL_laststatval = proto_perl->Ilaststatval; PL_laststype = proto_perl->Ilaststype; PL_mess_sv = NULL; PL_ors_sv = sv_dup_inc(proto_perl->Iors_sv, param); /* interpreter atexit processing */ PL_exitlistlen = proto_perl->Iexitlistlen; if (PL_exitlistlen) { Newx(PL_exitlist, PL_exitlistlen, PerlExitListEntry); Copy(proto_perl->Iexitlist, PL_exitlist, PL_exitlistlen, PerlExitListEntry); } else PL_exitlist = (PerlExitListEntry*)NULL; PL_my_cxt_size = proto_perl->Imy_cxt_size; if (PL_my_cxt_size) { Newx(PL_my_cxt_list, PL_my_cxt_size, void *); Copy(proto_perl->Imy_cxt_list, PL_my_cxt_list, PL_my_cxt_size, void *); #ifdef PERL_GLOBAL_STRUCT_PRIVATE Newx(PL_my_cxt_keys, PL_my_cxt_size, char *); Copy(proto_perl->Imy_cxt_keys, PL_my_cxt_keys, PL_my_cxt_size, char *); #endif } else { PL_my_cxt_list = (void**)NULL; #ifdef PERL_GLOBAL_STRUCT_PRIVATE PL_my_cxt_keys = (void**)NULL; #endif } PL_modglobal = hv_dup_inc(proto_perl->Imodglobal, param); PL_custom_op_names = hv_dup_inc(proto_perl->Icustom_op_names,param); PL_custom_op_descs = hv_dup_inc(proto_perl->Icustom_op_descs,param); PL_profiledata = NULL; PL_rsfp = fp_dup(proto_perl->Irsfp, '<', param); /* PL_rsfp_filters entries have fake IoDIRP() */ PL_rsfp_filters = av_dup_inc(proto_perl->Irsfp_filters, param); PL_compcv = cv_dup(proto_perl->Icompcv, param); PAD_CLONE_VARS(proto_perl, param); #ifdef HAVE_INTERP_INTERN sys_intern_dup(&proto_perl->Isys_intern, &PL_sys_intern); #endif /* more statics moved here */ PL_generation = proto_perl->Igeneration; PL_DBcv = cv_dup(proto_perl->IDBcv, param); PL_in_clean_objs = proto_perl->Iin_clean_objs; PL_in_clean_all = proto_perl->Iin_clean_all; PL_uid = proto_perl->Iuid; PL_euid = proto_perl->Ieuid; PL_gid = proto_perl->Igid; PL_egid = proto_perl->Iegid; PL_nomemok = proto_perl->Inomemok; PL_an = proto_perl->Ian; PL_evalseq = proto_perl->Ievalseq; PL_origenviron = proto_perl->Iorigenviron; /* XXX not quite right */ PL_origalen = proto_perl->Iorigalen; #ifdef PERL_USES_PL_PIDSTATUS PL_pidstatus = newHV(); /* XXX flag for cloning? */ #endif PL_osname = SAVEPV(proto_perl->Iosname); PL_sighandlerp = proto_perl->Isighandlerp; PL_runops = proto_perl->Irunops; Copy(proto_perl->Itokenbuf, PL_tokenbuf, 256, char); #ifdef CSH PL_cshlen = proto_perl->Icshlen; PL_cshname = proto_perl->Icshname; /* XXX never deallocated */ #endif PL_lex_state = proto_perl->Ilex_state; PL_lex_defer = proto_perl->Ilex_defer; PL_lex_expect = proto_perl->Ilex_expect; PL_lex_formbrack = proto_perl->Ilex_formbrack; PL_lex_dojoin = proto_perl->Ilex_dojoin; PL_lex_starts = proto_perl->Ilex_starts; PL_lex_stuff = sv_dup_inc(proto_perl->Ilex_stuff, param); PL_lex_repl = sv_dup_inc(proto_perl->Ilex_repl, param); PL_lex_op = proto_perl->Ilex_op; PL_lex_inpat = proto_perl->Ilex_inpat; PL_lex_inwhat = proto_perl->Ilex_inwhat; PL_lex_brackets = proto_perl->Ilex_brackets; i = (PL_lex_brackets < 120 ? 120 : PL_lex_brackets); PL_lex_brackstack = SAVEPVN(proto_perl->Ilex_brackstack,i); PL_lex_casemods = proto_perl->Ilex_casemods; i = (PL_lex_casemods < 12 ? 12 : PL_lex_casemods); PL_lex_casestack = SAVEPVN(proto_perl->Ilex_casestack,i); #ifdef PERL_MAD Copy(proto_perl->Inexttoke, PL_nexttoke, 5, NEXTTOKE); PL_lasttoke = proto_perl->Ilasttoke; PL_realtokenstart = proto_perl->Irealtokenstart; PL_faketokens = proto_perl->Ifaketokens; PL_thismad = proto_perl->Ithismad; PL_thistoken = proto_perl->Ithistoken; PL_thisopen = proto_perl->Ithisopen; PL_thisstuff = proto_perl->Ithisstuff; PL_thisclose = proto_perl->Ithisclose; PL_thiswhite = proto_perl->Ithiswhite; PL_nextwhite = proto_perl->Inextwhite; PL_skipwhite = proto_perl->Iskipwhite; PL_endwhite = proto_perl->Iendwhite; PL_curforce = proto_perl->Icurforce; #else Copy(proto_perl->Inextval, PL_nextval, 5, YYSTYPE); Copy(proto_perl->Inexttype, PL_nexttype, 5, I32); PL_nexttoke = proto_perl->Inexttoke; #endif PL_linestr = sv_dup_inc(proto_perl->Ilinestr, param); i = proto_perl->Ibufptr - SvPVX_const(proto_perl->Ilinestr); PL_bufptr = SvPVX(PL_linestr) + (i < 0 ? 0 : i); i = proto_perl->Ioldbufptr - SvPVX_const(proto_perl->Ilinestr); PL_oldbufptr = SvPVX(PL_linestr) + (i < 0 ? 0 : i); i = proto_perl->Ioldoldbufptr - SvPVX_const(proto_perl->Ilinestr); PL_oldoldbufptr = SvPVX(PL_linestr) + (i < 0 ? 0 : i); i = proto_perl->Ilinestart - SvPVX_const(proto_perl->Ilinestr); PL_linestart = SvPVX(PL_linestr) + (i < 0 ? 0 : i); PL_bufend = SvPVX(PL_linestr) + SvCUR(PL_linestr); PL_pending_ident = proto_perl->Ipending_ident; PL_sublex_info = proto_perl->Isublex_info; /* XXX not quite right */ PL_expect = proto_perl->Iexpect; PL_multi_start = proto_perl->Imulti_start; PL_multi_end = proto_perl->Imulti_end; PL_multi_open = proto_perl->Imulti_open; PL_multi_close = proto_perl->Imulti_close; PL_error_count = proto_perl->Ierror_count; PL_subline = proto_perl->Isubline; PL_subname = sv_dup_inc(proto_perl->Isubname, param); i = proto_perl->Ilast_uni - SvPVX_const(proto_perl->Ilinestr); PL_last_uni = SvPVX(PL_linestr) + (i < 0 ? 0 : i); i = proto_perl->Ilast_lop - SvPVX_const(proto_perl->Ilinestr); PL_last_lop = SvPVX(PL_linestr) + (i < 0 ? 0 : i); PL_last_lop_op = proto_perl->Ilast_lop_op; PL_in_my = proto_perl->Iin_my; PL_in_my_stash = hv_dup(proto_perl->Iin_my_stash, param); #ifdef FCRYPT PL_cryptseen = proto_perl->Icryptseen; #endif PL_hints = proto_perl->Ihints; PL_amagic_generation = proto_perl->Iamagic_generation; #ifdef USE_LOCALE_COLLATE PL_collation_ix = proto_perl->Icollation_ix; PL_collation_name = SAVEPV(proto_perl->Icollation_name); PL_collation_standard = proto_perl->Icollation_standard; PL_collxfrm_base = proto_perl->Icollxfrm_base; PL_collxfrm_mult = proto_perl->Icollxfrm_mult; #endif /* USE_LOCALE_COLLATE */ #ifdef USE_LOCALE_NUMERIC PL_numeric_name = SAVEPV(proto_perl->Inumeric_name); PL_numeric_standard = proto_perl->Inumeric_standard; PL_numeric_local = proto_perl->Inumeric_local; PL_numeric_radix_sv = sv_dup_inc(proto_perl->Inumeric_radix_sv, param); #endif /* !USE_LOCALE_NUMERIC */ /* utf8 character classes */ PL_utf8_alnum = sv_dup_inc(proto_perl->Iutf8_alnum, param); PL_utf8_alnumc = sv_dup_inc(proto_perl->Iutf8_alnumc, param); PL_utf8_ascii = sv_dup_inc(proto_perl->Iutf8_ascii, param); PL_utf8_alpha = sv_dup_inc(proto_perl->Iutf8_alpha, param); PL_utf8_space = sv_dup_inc(proto_perl->Iutf8_space, param); PL_utf8_cntrl = sv_dup_inc(proto_perl->Iutf8_cntrl, param); PL_utf8_graph = sv_dup_inc(proto_perl->Iutf8_graph, param); PL_utf8_digit = sv_dup_inc(proto_perl->Iutf8_digit, param); PL_utf8_upper = sv_dup_inc(proto_perl->Iutf8_upper, param); PL_utf8_lower = sv_dup_inc(proto_perl->Iutf8_lower, param); PL_utf8_print = sv_dup_inc(proto_perl->Iutf8_print, param); PL_utf8_punct = sv_dup_inc(proto_perl->Iutf8_punct, param); PL_utf8_xdigit = sv_dup_inc(proto_perl->Iutf8_xdigit, param); PL_utf8_mark = sv_dup_inc(proto_perl->Iutf8_mark, param); PL_utf8_toupper = sv_dup_inc(proto_perl->Iutf8_toupper, param); PL_utf8_totitle = sv_dup_inc(proto_perl->Iutf8_totitle, param); PL_utf8_tolower = sv_dup_inc(proto_perl->Iutf8_tolower, param); PL_utf8_tofold = sv_dup_inc(proto_perl->Iutf8_tofold, param); PL_utf8_idstart = sv_dup_inc(proto_perl->Iutf8_idstart, param); PL_utf8_idcont = sv_dup_inc(proto_perl->Iutf8_idcont, param); /* Did the locale setup indicate UTF-8? */ PL_utf8locale = proto_perl->Iutf8locale; /* Unicode features (see perlrun/-C) */ PL_unicode = proto_perl->Iunicode; /* Pre-5.8 signals control */ PL_signals = proto_perl->Isignals; /* times() ticks per second */ PL_clocktick = proto_perl->Iclocktick; /* Recursion stopper for PerlIO_find_layer */ PL_in_load_module = proto_perl->Iin_load_module; /* sort() routine */ PL_sort_RealCmp = proto_perl->Isort_RealCmp; /* Not really needed/useful since the reenrant_retint is "volatile", * but do it for consistency's sake. */ PL_reentrant_retint = proto_perl->Ireentrant_retint; /* Hooks to shared SVs and locks. */ PL_sharehook = proto_perl->Isharehook; PL_lockhook = proto_perl->Ilockhook; PL_unlockhook = proto_perl->Iunlockhook; PL_threadhook = proto_perl->Ithreadhook; PL_runops_std = proto_perl->Irunops_std; PL_runops_dbg = proto_perl->Irunops_dbg; #ifdef THREADS_HAVE_PIDS PL_ppid = proto_perl->Ippid; #endif /* swatch cache */ PL_last_swash_hv = NULL; /* reinits on demand */ PL_last_swash_klen = 0; PL_last_swash_key[0]= '\0'; PL_last_swash_tmps = (U8*)NULL; PL_last_swash_slen = 0; PL_glob_index = proto_perl->Iglob_index; PL_srand_called = proto_perl->Isrand_called; PL_uudmap[(U32) 'M'] = 0; /* reinits on demand */ PL_bitcount = NULL; /* reinits on demand */ if (proto_perl->Ipsig_pend) { Newxz(PL_psig_pend, SIG_SIZE, int); } else { PL_psig_pend = (int*)NULL; } if (proto_perl->Ipsig_ptr) { Newxz(PL_psig_ptr, SIG_SIZE, SV*); Newxz(PL_psig_name, SIG_SIZE, SV*); for (i = 1; i < SIG_SIZE; i++) { PL_psig_ptr[i] = sv_dup_inc(proto_perl->Ipsig_ptr[i], param); PL_psig_name[i] = sv_dup_inc(proto_perl->Ipsig_name[i], param); } } else { PL_psig_ptr = (SV**)NULL; PL_psig_name = (SV**)NULL; } /* thrdvar.h stuff */ if (flags & CLONEf_COPY_STACKS) { /* next allocation will be PL_tmps_stack[PL_tmps_ix+1] */ PL_tmps_ix = proto_perl->Ttmps_ix; PL_tmps_max = proto_perl->Ttmps_max; PL_tmps_floor = proto_perl->Ttmps_floor; Newxz(PL_tmps_stack, PL_tmps_max, SV*); i = 0; while (i <= PL_tmps_ix) { PL_tmps_stack[i] = sv_dup_inc(proto_perl->Ttmps_stack[i], param); ++i; } /* next PUSHMARK() sets *(PL_markstack_ptr+1) */ i = proto_perl->Tmarkstack_max - proto_perl->Tmarkstack; Newxz(PL_markstack, i, I32); PL_markstack_max = PL_markstack + (proto_perl->Tmarkstack_max - proto_perl->Tmarkstack); PL_markstack_ptr = PL_markstack + (proto_perl->Tmarkstack_ptr - proto_perl->Tmarkstack); Copy(proto_perl->Tmarkstack, PL_markstack, PL_markstack_ptr - PL_markstack + 1, I32); /* next push_scope()/ENTER sets PL_scopestack[PL_scopestack_ix] * NOTE: unlike the others! */ PL_scopestack_ix = proto_perl->Tscopestack_ix; PL_scopestack_max = proto_perl->Tscopestack_max; Newxz(PL_scopestack, PL_scopestack_max, I32); Copy(proto_perl->Tscopestack, PL_scopestack, PL_scopestack_ix, I32); /* NOTE: si_dup() looks at PL_markstack */ PL_curstackinfo = si_dup(proto_perl->Tcurstackinfo, param); /* PL_curstack = PL_curstackinfo->si_stack; */ PL_curstack = av_dup(proto_perl->Tcurstack, param); PL_mainstack = av_dup(proto_perl->Tmainstack, param); /* next PUSHs() etc. set *(PL_stack_sp+1) */ PL_stack_base = AvARRAY(PL_curstack); PL_stack_sp = PL_stack_base + (proto_perl->Tstack_sp - proto_perl->Tstack_base); PL_stack_max = PL_stack_base + AvMAX(PL_curstack); /* next SSPUSHFOO() sets PL_savestack[PL_savestack_ix] * NOTE: unlike the others! */ PL_savestack_ix = proto_perl->Tsavestack_ix; PL_savestack_max = proto_perl->Tsavestack_max; /*Newxz(PL_savestack, PL_savestack_max, ANY);*/ PL_savestack = ss_dup(proto_perl, param); } else { init_stacks(); ENTER; /* perl_destruct() wants to LEAVE; */ /* although we're not duplicating the tmps stack, we should still * add entries for any SVs on the tmps stack that got cloned by a * non-refcount means (eg a temp in @_); otherwise they will be * orphaned */ for (i = 0; i<= proto_perl->Ttmps_ix; i++) { SV * const nsv = (SV*)ptr_table_fetch(PL_ptr_table, proto_perl->Ttmps_stack[i]); if (nsv && !SvREFCNT(nsv)) { EXTEND_MORTAL(1); PL_tmps_stack[++PL_tmps_ix] = SvREFCNT_inc_simple(nsv); } } } PL_start_env = proto_perl->Tstart_env; /* XXXXXX */ PL_top_env = &PL_start_env; PL_op = proto_perl->Top; PL_Sv = NULL; PL_Xpv = (XPV*)NULL; PL_na = proto_perl->Tna; PL_statbuf = proto_perl->Tstatbuf; PL_statcache = proto_perl->Tstatcache; PL_statgv = gv_dup(proto_perl->Tstatgv, param); PL_statname = sv_dup_inc(proto_perl->Tstatname, param); #ifdef HAS_TIMES PL_timesbuf = proto_perl->Ttimesbuf; #endif PL_tainted = proto_perl->Ttainted; PL_curpm = proto_perl->Tcurpm; /* XXX No PMOP ref count */ PL_rs = sv_dup_inc(proto_perl->Trs, param); PL_last_in_gv = gv_dup(proto_perl->Tlast_in_gv, param); PL_ofs_sv = sv_dup_inc(proto_perl->Tofs_sv, param); PL_defoutgv = gv_dup_inc(proto_perl->Tdefoutgv, param); PL_chopset = proto_perl->Tchopset; /* XXX never deallocated */ PL_toptarget = sv_dup_inc(proto_perl->Ttoptarget, param); PL_bodytarget = sv_dup_inc(proto_perl->Tbodytarget, param); PL_formtarget = sv_dup(proto_perl->Tformtarget, param); PL_restartop = proto_perl->Trestartop; PL_in_eval = proto_perl->Tin_eval; PL_delaymagic = proto_perl->Tdelaymagic; PL_dirty = proto_perl->Tdirty; PL_localizing = proto_perl->Tlocalizing; PL_errors = sv_dup_inc(proto_perl->Terrors, param); PL_hv_fetch_ent_mh = NULL; PL_modcount = proto_perl->Tmodcount; PL_lastgotoprobe = NULL; PL_dumpindent = proto_perl->Tdumpindent; PL_sortcop = (OP*)any_dup(proto_perl->Tsortcop, proto_perl); PL_sortstash = hv_dup(proto_perl->Tsortstash, param); PL_firstgv = gv_dup(proto_perl->Tfirstgv, param); PL_secondgv = gv_dup(proto_perl->Tsecondgv, param); PL_efloatbuf = NULL; /* reinits on demand */ PL_efloatsize = 0; /* reinits on demand */ /* regex stuff */ PL_screamfirst = NULL; PL_screamnext = NULL; PL_maxscream = -1; /* reinits on demand */ PL_lastscream = NULL; PL_watchaddr = NULL; PL_watchok = NULL; PL_regdummy = proto_perl->Tregdummy; PL_colorset = 0; /* reinits PL_colors[] */ /*PL_colors[6] = {0,0,0,0,0,0};*/ /* Pluggable optimizer */ PL_peepp = proto_perl->Tpeepp; PL_stashcache = newHV(); if (!(flags & CLONEf_KEEP_PTR_TABLE)) { ptr_table_free(PL_ptr_table); PL_ptr_table = NULL; } /* Call the ->CLONE method, if it exists, for each of the stashes identified by sv_dup() above. */ while(av_len(param->stashes) != -1) { HV* const stash = (HV*) av_shift(param->stashes); GV* const cloner = gv_fetchmethod_autoload(stash, "CLONE", 0); if (cloner && GvCV(cloner)) { dSP; ENTER; SAVETMPS; PUSHMARK(SP); XPUSHs(sv_2mortal(newSVhek(HvNAME_HEK(stash)))); PUTBACK; call_sv((SV*)GvCV(cloner), G_DISCARD); FREETMPS; LEAVE; } } SvREFCNT_dec(param->stashes); /* orphaned? eg threads->new inside BEGIN or use */ if (PL_compcv && ! SvREFCNT(PL_compcv)) { SvREFCNT_inc_simple_void(PL_compcv); SAVEFREESV(PL_compcv); } return my_perl; } #endif /* USE_ITHREADS */ /* =head1 Unicode Support =for apidoc sv_recode_to_utf8 The encoding is assumed to be an Encode object, on entry the PV of the sv is assumed to be octets in that encoding, and the sv will be converted into Unicode (and UTF-8). If the sv already is UTF-8 (or if it is not POK), or if the encoding is not a reference, nothing is done to the sv. If the encoding is not an C Encoding object, bad things will happen. (See F and L). The PV of the sv is returned. =cut */ char * Perl_sv_recode_to_utf8(pTHX_ SV *sv, SV *encoding) { dVAR; if (SvPOK(sv) && !SvUTF8(sv) && !IN_BYTES && SvROK(encoding)) { SV *uni; STRLEN len; const char *s; dSP; ENTER; SAVETMPS; save_re_context(); PUSHMARK(sp); EXTEND(SP, 3); XPUSHs(encoding); XPUSHs(sv); /* NI-S 2002/07/09 Passing sv_yes is wrong - it needs to be or'ed set of constants for Encode::XS, while UTf-8 decode (currently) assumes a true value means remove converted chars from source. Both will default the value - let them. XPUSHs(&PL_sv_yes); */ PUTBACK; call_method("decode", G_SCALAR); SPAGAIN; uni = POPs; PUTBACK; s = SvPV_const(uni, len); if (s != SvPVX_const(sv)) { SvGROW(sv, len + 1); Move(s, SvPVX(sv), len + 1, char); SvCUR_set(sv, len); } FREETMPS; LEAVE; SvUTF8_on(sv); return SvPVX(sv); } return SvPOKp(sv) ? SvPVX(sv) : NULL; } /* =for apidoc sv_cat_decode The encoding is assumed to be an Encode object, the PV of the ssv is assumed to be octets in that encoding and decoding the input starts from the position which (PV + *offset) pointed to. The dsv will be concatenated the decoded UTF-8 string from ssv. Decoding will terminate when the string tstr appears in decoding output or the input ends on the PV of the ssv. The value which the offset points will be modified to the last input position on the ssv. Returns TRUE if the terminator was found, else returns FALSE. =cut */ bool Perl_sv_cat_decode(pTHX_ SV *dsv, SV *encoding, SV *ssv, int *offset, char *tstr, int tlen) { dVAR; bool ret = FALSE; if (SvPOK(ssv) && SvPOK(dsv) && SvROK(encoding) && offset) { SV *offsv; dSP; ENTER; SAVETMPS; save_re_context(); PUSHMARK(sp); EXTEND(SP, 6); XPUSHs(encoding); XPUSHs(dsv); XPUSHs(ssv); XPUSHs(offsv = sv_2mortal(newSViv(*offset))); XPUSHs(sv_2mortal(newSVpvn(tstr, tlen))); PUTBACK; call_method("cat_decode", G_SCALAR); SPAGAIN; ret = SvTRUE(TOPs); *offset = SvIV(offsv); PUTBACK; FREETMPS; LEAVE; } else Perl_croak(aTHX_ "Invalid argument to sv_cat_decode"); return ret; } /* --------------------------------------------------------------------- * * support functions for report_uninit() */ /* the maxiumum size of array or hash where we will scan looking * for the undefined element that triggered the warning */ #define FUV_MAX_SEARCH_SIZE 1000 /* Look for an entry in the hash whose value has the same SV as val; * If so, return a mortal copy of the key. */ STATIC SV* S_find_hash_subscript(pTHX_ HV *hv, SV* val) { dVAR; register HE **array; I32 i; if (!hv || SvMAGICAL(hv) || !HvARRAY(hv) || (HvTOTALKEYS(hv) > FUV_MAX_SEARCH_SIZE)) return NULL; array = HvARRAY(hv); for (i=HvMAX(hv); i>0; i--) { register HE *entry; for (entry = array[i]; entry; entry = HeNEXT(entry)) { if (HeVAL(entry) != val) continue; if ( HeVAL(entry) == &PL_sv_undef || HeVAL(entry) == &PL_sv_placeholder) continue; if (!HeKEY(entry)) return NULL; if (HeKLEN(entry) == HEf_SVKEY) return sv_mortalcopy(HeKEY_sv(entry)); return sv_2mortal(newSVpvn(HeKEY(entry), HeKLEN(entry))); } } return NULL; } /* Look for an entry in the array whose value has the same SV as val; * If so, return the index, otherwise return -1. */ STATIC I32 S_find_array_subscript(pTHX_ AV *av, SV* val) { dVAR; if (!av || SvMAGICAL(av) || !AvARRAY(av) || (AvFILLp(av) > FUV_MAX_SEARCH_SIZE)) return -1; if (val != &PL_sv_undef) { SV ** const svp = AvARRAY(av); I32 i; for (i=AvFILLp(av); i>=0; i--) if (svp[i] == val) return i; } return -1; } /* S_varname(): return the name of a variable, optionally with a subscript. * If gv is non-zero, use the name of that global, along with gvtype (one * of "$", "@", "%"); otherwise use the name of the lexical at pad offset * targ. Depending on the value of the subscript_type flag, return: */ #define FUV_SUBSCRIPT_NONE 1 /* "@foo" */ #define FUV_SUBSCRIPT_ARRAY 2 /* "$foo[aindex]" */ #define FUV_SUBSCRIPT_HASH 3 /* "$foo{keyname}" */ #define FUV_SUBSCRIPT_WITHIN 4 /* "within @foo" */ STATIC SV* S_varname(pTHX_ GV *gv, const char gvtype, PADOFFSET targ, SV* keyname, I32 aindex, int subscript_type) { SV * const name = sv_newmortal(); if (gv) { char buffer[2]; buffer[0] = gvtype; buffer[1] = 0; /* as gv_fullname4(), but add literal '^' for $^FOO names */ gv_fullname4(name, gv, buffer, 0); if ((unsigned int)SvPVX(name)[1] <= 26) { buffer[0] = '^'; buffer[1] = SvPVX(name)[1] + 'A' - 1; /* Swap the 1 unprintable control character for the 2 byte pretty version - ie substr($name, 1, 1) = $buffer; */ sv_insert(name, 1, 1, buffer, 2); } } else { U32 unused; CV * const cv = find_runcv(&unused); SV *sv; AV *av; if (!cv || !CvPADLIST(cv)) return NULL; av = (AV*)(*av_fetch(CvPADLIST(cv), 0, FALSE)); sv = *av_fetch(av, targ, FALSE); sv_setpvn(name, SvPV_nolen_const(sv), SvCUR(sv)); } if (subscript_type == FUV_SUBSCRIPT_HASH) { SV * const sv = newSV(0); *SvPVX(name) = '$'; Perl_sv_catpvf(aTHX_ name, "{%s}", pv_display(sv,SvPVX_const(keyname), SvCUR(keyname), 0, 32)); SvREFCNT_dec(sv); } else if (subscript_type == FUV_SUBSCRIPT_ARRAY) { *SvPVX(name) = '$'; Perl_sv_catpvf(aTHX_ name, "[%"IVdf"]", (IV)aindex); } else if (subscript_type == FUV_SUBSCRIPT_WITHIN) Perl_sv_insert(aTHX_ name, 0, 0, STR_WITH_LEN("within ")); return name; } /* =for apidoc find_uninit_var Find the name of the undefined variable (if any) that caused the operator o to issue a "Use of uninitialized value" warning. If match is true, only return a name if it's value matches uninit_sv. So roughly speaking, if a unary operator (such as OP_COS) generates a warning, then following the direct child of the op may yield an OP_PADSV or OP_GV that gives the name of the undefined variable. On the other hand, with OP_ADD there are two branches to follow, so we only print the variable name if we get an exact match. The name is returned as a mortal SV. Assumes that PL_op is the op that originally triggered the error, and that PL_comppad/PL_curpad points to the currently executing pad. =cut */ STATIC SV * S_find_uninit_var(pTHX_ OP* obase, SV* uninit_sv, bool match) { dVAR; SV *sv; AV *av; GV *gv; OP *o, *o2, *kid; if (!obase || (match && (!uninit_sv || uninit_sv == &PL_sv_undef || uninit_sv == &PL_sv_placeholder))) return NULL; switch (obase->op_type) { case OP_RV2AV: case OP_RV2HV: case OP_PADAV: case OP_PADHV: { const bool pad = (obase->op_type == OP_PADAV || obase->op_type == OP_PADHV); const bool hash = (obase->op_type == OP_PADHV || obase->op_type == OP_RV2HV); I32 index = 0; SV *keysv = NULL; int subscript_type = FUV_SUBSCRIPT_WITHIN; if (pad) { /* @lex, %lex */ sv = PAD_SVl(obase->op_targ); gv = NULL; } else { if (cUNOPx(obase)->op_first->op_type == OP_GV) { /* @global, %global */ gv = cGVOPx_gv(cUNOPx(obase)->op_first); if (!gv) break; sv = hash ? (SV*)GvHV(gv): (SV*)GvAV(gv); } else /* @{expr}, %{expr} */ return find_uninit_var(cUNOPx(obase)->op_first, uninit_sv, match); } /* attempt to find a match within the aggregate */ if (hash) { keysv = find_hash_subscript((HV*)sv, uninit_sv); if (keysv) subscript_type = FUV_SUBSCRIPT_HASH; } else { index = find_array_subscript((AV*)sv, uninit_sv); if (index >= 0) subscript_type = FUV_SUBSCRIPT_ARRAY; } if (match && subscript_type == FUV_SUBSCRIPT_WITHIN) break; return varname(gv, hash ? '%' : '@', obase->op_targ, keysv, index, subscript_type); } case OP_PADSV: if (match && PAD_SVl(obase->op_targ) != uninit_sv) break; return varname(NULL, '$', obase->op_targ, NULL, 0, FUV_SUBSCRIPT_NONE); case OP_GVSV: gv = cGVOPx_gv(obase); if (!gv || (match && GvSV(gv) != uninit_sv)) break; return varname(gv, '$', 0, NULL, 0, FUV_SUBSCRIPT_NONE); case OP_AELEMFAST: if (obase->op_flags & OPf_SPECIAL) { /* lexical array */ if (match) { SV **svp; av = (AV*)PAD_SV(obase->op_targ); if (!av || SvRMAGICAL(av)) break; svp = av_fetch(av, (I32)obase->op_private, FALSE); if (!svp || *svp != uninit_sv) break; } return varname(NULL, '$', obase->op_targ, NULL, (I32)obase->op_private, FUV_SUBSCRIPT_ARRAY); } else { gv = cGVOPx_gv(obase); if (!gv) break; if (match) { SV **svp; av = GvAV(gv); if (!av || SvRMAGICAL(av)) break; svp = av_fetch(av, (I32)obase->op_private, FALSE); if (!svp || *svp != uninit_sv) break; } return varname(gv, '$', 0, NULL, (I32)obase->op_private, FUV_SUBSCRIPT_ARRAY); } break; case OP_EXISTS: o = cUNOPx(obase)->op_first; if (!o || o->op_type != OP_NULL || ! (o->op_targ == OP_AELEM || o->op_targ == OP_HELEM)) break; return find_uninit_var(cBINOPo->op_last, uninit_sv, match); case OP_AELEM: case OP_HELEM: if (PL_op == obase) /* $a[uninit_expr] or $h{uninit_expr} */ return find_uninit_var(cBINOPx(obase)->op_last, uninit_sv, match); gv = NULL; o = cBINOPx(obase)->op_first; kid = cBINOPx(obase)->op_last; /* get the av or hv, and optionally the gv */ sv = NULL; if (o->op_type == OP_PADAV || o->op_type == OP_PADHV) { sv = PAD_SV(o->op_targ); } else if ((o->op_type == OP_RV2AV || o->op_type == OP_RV2HV) && cUNOPo->op_first->op_type == OP_GV) { gv = cGVOPx_gv(cUNOPo->op_first); if (!gv) break; sv = o->op_type == OP_RV2HV ? (SV*)GvHV(gv) : (SV*)GvAV(gv); } if (!sv) break; if (kid && kid->op_type == OP_CONST && SvOK(cSVOPx_sv(kid))) { /* index is constant */ if (match) { if (SvMAGICAL(sv)) break; if (obase->op_type == OP_HELEM) { HE* he = hv_fetch_ent((HV*)sv, cSVOPx_sv(kid), 0, 0); if (!he || HeVAL(he) != uninit_sv) break; } else { SV * const * const svp = av_fetch((AV*)sv, SvIV(cSVOPx_sv(kid)), FALSE); if (!svp || *svp != uninit_sv) break; } } if (obase->op_type == OP_HELEM) return varname(gv, '%', o->op_targ, cSVOPx_sv(kid), 0, FUV_SUBSCRIPT_HASH); else return varname(gv, '@', o->op_targ, NULL, SvIV(cSVOPx_sv(kid)), FUV_SUBSCRIPT_ARRAY); } else { /* index is an expression; * attempt to find a match within the aggregate */ if (obase->op_type == OP_HELEM) { SV * const keysv = find_hash_subscript((HV*)sv, uninit_sv); if (keysv) return varname(gv, '%', o->op_targ, keysv, 0, FUV_SUBSCRIPT_HASH); } else { const I32 index = find_array_subscript((AV*)sv, uninit_sv); if (index >= 0) return varname(gv, '@', o->op_targ, NULL, index, FUV_SUBSCRIPT_ARRAY); } if (match) break; return varname(gv, (o->op_type == OP_PADAV || o->op_type == OP_RV2AV) ? '@' : '%', o->op_targ, NULL, 0, FUV_SUBSCRIPT_WITHIN); } break; case OP_AASSIGN: /* only examine RHS */ return find_uninit_var(cBINOPx(obase)->op_first, uninit_sv, match); case OP_OPEN: o = cUNOPx(obase)->op_first; if (o->op_type == OP_PUSHMARK) o = o->op_sibling; if (!o->op_sibling) { /* one-arg version of open is highly magical */ if (o->op_type == OP_GV) { /* open FOO; */ gv = cGVOPx_gv(o); if (match && GvSV(gv) != uninit_sv) break; return varname(gv, '$', 0, NULL, 0, FUV_SUBSCRIPT_NONE); } /* other possibilities not handled are: * open $x; or open my $x; should return '${*$x}' * open expr; should return '$'.expr ideally */ break; } goto do_op; /* ops where $_ may be an implicit arg */ case OP_TRANS: case OP_SUBST: case OP_MATCH: if ( !(obase->op_flags & OPf_STACKED)) { if (uninit_sv == ((obase->op_private & OPpTARGET_MY) ? PAD_SVl(obase->op_targ) : DEFSV)) { sv = sv_newmortal(); sv_setpvn(sv, "$_", 2); return sv; } } goto do_op; case OP_PRTF: case OP_PRINT: /* skip filehandle as it can't produce 'undef' warning */ o = cUNOPx(obase)->op_first; if ((obase->op_flags & OPf_STACKED) && o->op_type == OP_PUSHMARK) o = o->op_sibling->op_sibling; goto do_op2; case OP_RV2SV: case OP_CUSTOM: case OP_ENTERSUB: match = 1; /* XS or custom code could trigger random warnings */ goto do_op; case OP_SCHOMP: case OP_CHOMP: if (SvROK(PL_rs) && uninit_sv == SvRV(PL_rs)) return sv_2mortal(newSVpvs("${$/}")); /*FALLTHROUGH*/ default: do_op: if (!(obase->op_flags & OPf_KIDS)) break; o = cUNOPx(obase)->op_first; do_op2: if (!o) break; /* if all except one arg are constant, or have no side-effects, * or are optimized away, then it's unambiguous */ o2 = NULL; for (kid=o; kid; kid = kid->op_sibling) { if (kid) { const OPCODE type = kid->op_type; if ( (type == OP_CONST && SvOK(cSVOPx_sv(kid))) || (type == OP_NULL && ! (kid->op_flags & OPf_KIDS)) || (type == OP_PUSHMARK) ) continue; } if (o2) { /* more than one found */ o2 = NULL; break; } o2 = kid; } if (o2) return find_uninit_var(o2, uninit_sv, match); /* scan all args */ while (o) { sv = find_uninit_var(o, uninit_sv, 1); if (sv) return sv; o = o->op_sibling; } break; } return NULL; } /* =for apidoc report_uninit Print appropriate "Use of uninitialized variable" warning =cut */ void Perl_report_uninit(pTHX_ SV* uninit_sv) { dVAR; if (PL_op) { SV* varname = NULL; if (uninit_sv) { varname = find_uninit_var(PL_op, uninit_sv,0); if (varname) sv_insert(varname, 0, 0, " ", 1); } Perl_warner(aTHX_ packWARN(WARN_UNINITIALIZED), PL_warn_uninit, varname ? SvPV_nolen_const(varname) : "", " in ", OP_DESC(PL_op)); } else Perl_warner(aTHX_ packWARN(WARN_UNINITIALIZED), PL_warn_uninit, "", "", ""); } /* * Local variables: * c-indentation-style: bsd * c-basic-offset: 4 * indent-tabs-mode: t * End: * * ex: set ts=8 sts=4 sw=4 noet: */