#line 2 "op.c" /* op.c * * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 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. * */ /* * 'You see: Mr. Drogo, he married poor Miss Primula Brandybuck. She was * our Mr. Bilbo's first cousin on the mother's side (her mother being the * youngest of the Old Took's daughters); and Mr. Drogo was his second * cousin. So Mr. Frodo is his first *and* second cousin, once removed * either way, as the saying is, if you follow me.' --the Gaffer * * [p.23 of _The Lord of the Rings_, I/i: "A Long-Expected Party"] */ /* This file contains the functions that create, manipulate and optimize * the OP structures that hold a compiled perl program. * * Note that during the build of miniperl, a temporary copy of this file * is made, called opmini.c. * * A Perl program is compiled into a tree of OP nodes. Each op contains: * * structural OP pointers to its children and siblings (op_sibling, * op_first etc) that define the tree structure; * * execution order OP pointers (op_next, plus sometimes op_other, * op_lastop etc) that define the execution sequence plus variants; * * a pointer to the C "pp" function that would execute the op; * * any data specific to that op. * For example, an OP_CONST op points to the pp_const() function and to an * SV containing the constant value. When pp_const() is executed, its job * is to push that SV onto the stack. * * OPs are mainly created by the newFOO() functions, which are mainly * called from the parser (in perly.y) as the code is parsed. For example * the Perl code $a + $b * $c would cause the equivalent of the following * to be called (oversimplifying a bit): * * newBINOP(OP_ADD, flags, * newSVREF($a), * newBINOP(OP_MULTIPLY, flags, newSVREF($b), newSVREF($c)) * ) * * As the parser reduces low-level rules, it creates little op subtrees; * as higher-level rules are resolved, these subtrees get joined together * as branches on a bigger subtree, until eventually a top-level rule like * a subroutine definition is reduced, at which point there is one large * parse tree left. * * The execution order pointers (op_next) are generated as the subtrees * are joined together. Consider this sub-expression: A*B + C/D: at the * point when it's just been parsed, the op tree looks like: * * [+] * | * [*]------[/] * | | * A---B C---D * * with the intended execution order being: * * [PREV] => A => B => [*] => C => D => [/] => [+] => [NEXT] * * At this point all the nodes' op_next pointers will have been set, * except that: * * we don't know what the [NEXT] node will be yet; * * we don't know what the [PREV] node will be yet, but when it gets * created and needs its op_next set, it needs to be set to point to * A, which is non-obvious. * To handle both those cases, we temporarily set the top node's * op_next to point to the first node to be executed in this subtree (A in * this case). This means that initially a subtree's op_next chain, * starting from the top node, will visit each node in execution sequence * then point back at the top node. * When we embed this subtree in a larger tree, its top op_next is used * to get the start node, then is set to point to its new neighbour. * For example the two separate [*],A,B and [/],C,D subtrees would * initially have had: * [*] => A; A => B; B => [*] * and * [/] => C; C => D; D => [/] * When these two subtrees were joined together to make the [+] subtree, * [+]'s op_next was set to [*]'s op_next, i.e. A; then [*]'s op_next was * set to point to [/]'s op_next, i.e. C. * * This op_next linking is done by the LINKLIST() macro and its underlying * op_linklist() function. Given a top-level op, if its op_next is * non-null, it's already been linked, so leave it. Otherwise link it with * its children as described above, possibly recursively if any of the * children have a null op_next. * * In summary: given a subtree, its top-level node's op_next will either * be: * NULL: the subtree hasn't been LINKLIST()ed yet; * fake: points to the start op for this subtree; * real: once the subtree has been embedded into a larger tree */ /* Here's an older description from Larry. Perl's compiler is essentially a 3-pass compiler with interleaved phases: A bottom-up pass A top-down pass An execution-order pass The bottom-up pass is represented by all the "newOP" routines and the ck_ routines. The bottom-upness is actually driven by yacc. So at the point that a ck_ routine fires, we have no idea what the context is, either upward in the syntax tree, or either forward or backward in the execution order. (The bottom-up parser builds that part of the execution order it knows about, but if you follow the "next" links around, you'll find it's actually a closed loop through the top level node.) Whenever the bottom-up parser gets to a node that supplies context to its components, it invokes that portion of the top-down pass that applies to that part of the subtree (and marks the top node as processed, so if a node further up supplies context, it doesn't have to take the plunge again). As a particular subcase of this, as the new node is built, it takes all the closed execution loops of its subcomponents and links them into a new closed loop for the higher level node. But it's still not the real execution order. The actual execution order is not known till we get a grammar reduction to a top-level unit like a subroutine or file that will be called by "name" rather than via a "next" pointer. At that point, we can call into peep() to do that code's portion of the 3rd pass. It has to be recursive, but it's recursive on basic blocks, not on tree nodes. */ /* To implement user lexical pragmas, there needs to be a way at run time to get the compile time state of %^H for that block. Storing %^H in every block (or even COP) would be very expensive, so a different approach is taken. The (running) state of %^H is serialised into a tree of HE-like structs. Stores into %^H are chained onto the current leaf as a struct refcounted_he * with the key and the value. Deletes from %^H are saved with a value of PL_sv_placeholder. The state of %^H at any point can be turned back into a regular HV by walking back up the tree from that point's leaf, ignoring any key you've already seen (placeholder or not), storing the rest into the HV structure, then removing the placeholders. Hence memory is only used to store the %^H deltas from the enclosing COP, rather than the entire %^H on each COP. To cause actions on %^H to write out the serialisation records, it has magic type 'H'. This magic (itself) does nothing, but its presence causes the values to gain magic type 'h', which has entries for set and clear. C updates C with a store record, with deletes written by C. C saves the current C on the save stack, so that it will be correctly restored when any inner compiling scope is exited. */ #include "EXTERN.h" #define PERL_IN_OP_C #include "perl.h" #include "keywords.h" #include "feature.h" #include "regcomp.h" #define CALL_PEEP(o) PL_peepp(aTHX_ o) #define CALL_RPEEP(o) PL_rpeepp(aTHX_ o) #define CALL_OPFREEHOOK(o) if (PL_opfreehook) PL_opfreehook(aTHX_ o) static const char array_passed_to_stat[] = "Array passed to stat will be coerced to a scalar"; /* Used to avoid recursion through the op tree in scalarvoid() and op_free() */ #define DEFERRED_OP_STEP 100 #define DEFER_OP(o) \ STMT_START { \ if (UNLIKELY(defer_ix == (defer_stack_alloc-1))) { \ defer_stack_alloc += DEFERRED_OP_STEP; \ assert(defer_stack_alloc > 0); \ Renew(defer_stack, defer_stack_alloc, OP *); \ } \ defer_stack[++defer_ix] = o; \ } STMT_END #define POP_DEFERRED_OP() (defer_ix >= 0 ? defer_stack[defer_ix--] : (OP *)NULL) /* remove any leading "empty" ops from the op_next chain whose first * node's address is stored in op_p. Store the updated address of the * first node in op_p. */ STATIC void S_prune_chain_head(OP** op_p) { while (*op_p && ( (*op_p)->op_type == OP_NULL || (*op_p)->op_type == OP_SCOPE || (*op_p)->op_type == OP_SCALAR || (*op_p)->op_type == OP_LINESEQ) ) *op_p = (*op_p)->op_next; } /* See the explanatory comments above struct opslab in op.h. */ #ifdef PERL_DEBUG_READONLY_OPS # define PERL_SLAB_SIZE 128 # define PERL_MAX_SLAB_SIZE 4096 # include #endif #ifndef PERL_SLAB_SIZE # define PERL_SLAB_SIZE 64 #endif #ifndef PERL_MAX_SLAB_SIZE # define PERL_MAX_SLAB_SIZE 2048 #endif /* rounds up to nearest pointer */ #define SIZE_TO_PSIZE(x) (((x) + sizeof(I32 *) - 1)/sizeof(I32 *)) #define DIFF(o,p) ((size_t)((I32 **)(p) - (I32**)(o))) static OPSLAB * S_new_slab(pTHX_ size_t sz) { #ifdef PERL_DEBUG_READONLY_OPS OPSLAB *slab = (OPSLAB *) mmap(0, sz * sizeof(I32 *), PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0); DEBUG_m(PerlIO_printf(Perl_debug_log, "mapped %lu at %p\n", (unsigned long) sz, slab)); if (slab == MAP_FAILED) { perror("mmap failed"); abort(); } slab->opslab_size = (U16)sz; #else OPSLAB *slab = (OPSLAB *)PerlMemShared_calloc(sz, sizeof(I32 *)); #endif #ifndef WIN32 /* The context is unused in non-Windows */ PERL_UNUSED_CONTEXT; #endif slab->opslab_first = (OPSLOT *)((I32 **)slab + sz - 1); return slab; } /* requires double parens and aTHX_ */ #define DEBUG_S_warn(args) \ DEBUG_S( \ PerlIO_printf(Perl_debug_log, "%s", SvPVx_nolen(Perl_mess args)) \ ) void * Perl_Slab_Alloc(pTHX_ size_t sz) { OPSLAB *slab; OPSLAB *slab2; OPSLOT *slot; OP *o; size_t opsz, space; /* We only allocate ops from the slab during subroutine compilation. We find the slab via PL_compcv, hence that must be non-NULL. It could also be pointing to a subroutine which is now fully set up (CvROOT() pointing to the top of the optree for that sub), or a subroutine which isn't using the slab allocator. If our sanity checks aren't met, don't use a slab, but allocate the OP directly from the heap. */ if (!PL_compcv || CvROOT(PL_compcv) || (CvSTART(PL_compcv) && !CvSLABBED(PL_compcv))) { o = (OP*)PerlMemShared_calloc(1, sz); goto gotit; } /* While the subroutine is under construction, the slabs are accessed via CvSTART(), to avoid needing to expand PVCV by one pointer for something unneeded at runtime. Once a subroutine is constructed, the slabs are accessed via CvROOT(). So if CvSTART() is NULL, no slab has been allocated yet. See the commit message for 8be227ab5eaa23f2 for more details. */ if (!CvSTART(PL_compcv)) { CvSTART(PL_compcv) = (OP *)(slab = S_new_slab(aTHX_ PERL_SLAB_SIZE)); CvSLABBED_on(PL_compcv); slab->opslab_refcnt = 2; /* one for the CV; one for the new OP */ } else ++(slab = (OPSLAB *)CvSTART(PL_compcv))->opslab_refcnt; opsz = SIZE_TO_PSIZE(sz); sz = opsz + OPSLOT_HEADER_P; /* The slabs maintain a free list of OPs. In particular, constant folding will free up OPs, so it makes sense to re-use them where possible. A freed up slot is used in preference to a new allocation. */ if (slab->opslab_freed) { OP **too = &slab->opslab_freed; o = *too; DEBUG_S_warn((aTHX_ "found free op at %p, slab %p", (void*)o, (void*)slab)); while (o && DIFF(OpSLOT(o), OpSLOT(o)->opslot_next) < sz) { DEBUG_S_warn((aTHX_ "Alas! too small")); o = *(too = &o->op_next); if (o) { DEBUG_S_warn((aTHX_ "found another free op at %p", (void*)o)); } } if (o) { *too = o->op_next; Zero(o, opsz, I32 *); o->op_slabbed = 1; goto gotit; } } #define INIT_OPSLOT \ slot->opslot_slab = slab; \ slot->opslot_next = slab2->opslab_first; \ slab2->opslab_first = slot; \ o = &slot->opslot_op; \ o->op_slabbed = 1 /* The partially-filled slab is next in the chain. */ slab2 = slab->opslab_next ? slab->opslab_next : slab; if ((space = DIFF(&slab2->opslab_slots, slab2->opslab_first)) < sz) { /* Remaining space is too small. */ /* If we can fit a BASEOP, add it to the free chain, so as not to waste it. */ if (space >= SIZE_TO_PSIZE(sizeof(OP)) + OPSLOT_HEADER_P) { slot = &slab2->opslab_slots; INIT_OPSLOT; o->op_type = OP_FREED; o->op_next = slab->opslab_freed; slab->opslab_freed = o; } /* Create a new slab. Make this one twice as big. */ slot = slab2->opslab_first; while (slot->opslot_next) slot = slot->opslot_next; slab2 = S_new_slab(aTHX_ (DIFF(slab2, slot)+1)*2 > PERL_MAX_SLAB_SIZE ? PERL_MAX_SLAB_SIZE : (DIFF(slab2, slot)+1)*2); slab2->opslab_next = slab->opslab_next; slab->opslab_next = slab2; } assert(DIFF(&slab2->opslab_slots, slab2->opslab_first) >= sz); /* Create a new op slot */ slot = (OPSLOT *)((I32 **)slab2->opslab_first - sz); assert(slot >= &slab2->opslab_slots); if (DIFF(&slab2->opslab_slots, slot) < SIZE_TO_PSIZE(sizeof(OP)) + OPSLOT_HEADER_P) slot = &slab2->opslab_slots; INIT_OPSLOT; DEBUG_S_warn((aTHX_ "allocating op at %p, slab %p", (void*)o, (void*)slab)); gotit: #ifdef PERL_OP_PARENT /* moresib == 0, op_sibling == 0 implies a solitary unattached op */ assert(!o->op_moresib); assert(!o->op_sibparent); #endif return (void *)o; } #undef INIT_OPSLOT #ifdef PERL_DEBUG_READONLY_OPS void Perl_Slab_to_ro(pTHX_ OPSLAB *slab) { PERL_ARGS_ASSERT_SLAB_TO_RO; if (slab->opslab_readonly) return; slab->opslab_readonly = 1; for (; slab; slab = slab->opslab_next) { /*DEBUG_U(PerlIO_printf(Perl_debug_log,"mprotect ->ro %lu at %p\n", (unsigned long) slab->opslab_size, slab));*/ if (mprotect(slab, slab->opslab_size * sizeof(I32 *), PROT_READ)) Perl_warn(aTHX_ "mprotect for %p %lu failed with %d", slab, (unsigned long)slab->opslab_size, errno); } } void Perl_Slab_to_rw(pTHX_ OPSLAB *const slab) { OPSLAB *slab2; PERL_ARGS_ASSERT_SLAB_TO_RW; if (!slab->opslab_readonly) return; slab2 = slab; for (; slab2; slab2 = slab2->opslab_next) { /*DEBUG_U(PerlIO_printf(Perl_debug_log,"mprotect ->rw %lu at %p\n", (unsigned long) size, slab2));*/ if (mprotect((void *)slab2, slab2->opslab_size * sizeof(I32 *), PROT_READ|PROT_WRITE)) { Perl_warn(aTHX_ "mprotect RW for %p %lu failed with %d", slab, (unsigned long)slab2->opslab_size, errno); } } slab->opslab_readonly = 0; } #else # define Slab_to_rw(op) NOOP #endif /* This cannot possibly be right, but it was copied from the old slab allocator, to which it was originally added, without explanation, in commit 083fcd5. */ #ifdef NETWARE # define PerlMemShared PerlMem #endif /* make freed ops die if they're inadvertently executed */ #ifdef DEBUGGING static OP * S_pp_freed(pTHX) { DIE(aTHX_ "panic: freed op 0x%p called\n", PL_op); } #endif void Perl_Slab_Free(pTHX_ void *op) { OP * const o = (OP *)op; OPSLAB *slab; PERL_ARGS_ASSERT_SLAB_FREE; #ifdef DEBUGGING o->op_ppaddr = S_pp_freed; #endif if (!o->op_slabbed) { if (!o->op_static) PerlMemShared_free(op); return; } slab = OpSLAB(o); /* If this op is already freed, our refcount will get screwy. */ assert(o->op_type != OP_FREED); o->op_type = OP_FREED; o->op_next = slab->opslab_freed; slab->opslab_freed = o; DEBUG_S_warn((aTHX_ "free op at %p, recorded in slab %p", (void*)o, (void*)slab)); OpslabREFCNT_dec_padok(slab); } void Perl_opslab_free_nopad(pTHX_ OPSLAB *slab) { const bool havepad = !!PL_comppad; PERL_ARGS_ASSERT_OPSLAB_FREE_NOPAD; if (havepad) { ENTER; PAD_SAVE_SETNULLPAD(); } opslab_free(slab); if (havepad) LEAVE; } void Perl_opslab_free(pTHX_ OPSLAB *slab) { OPSLAB *slab2; PERL_ARGS_ASSERT_OPSLAB_FREE; PERL_UNUSED_CONTEXT; DEBUG_S_warn((aTHX_ "freeing slab %p", (void*)slab)); assert(slab->opslab_refcnt == 1); do { slab2 = slab->opslab_next; #ifdef DEBUGGING slab->opslab_refcnt = ~(size_t)0; #endif #ifdef PERL_DEBUG_READONLY_OPS DEBUG_m(PerlIO_printf(Perl_debug_log, "Deallocate slab at %p\n", (void*)slab)); if (munmap(slab, slab->opslab_size * sizeof(I32 *))) { perror("munmap failed"); abort(); } #else PerlMemShared_free(slab); #endif slab = slab2; } while (slab); } void Perl_opslab_force_free(pTHX_ OPSLAB *slab) { OPSLAB *slab2; #ifdef DEBUGGING size_t savestack_count = 0; #endif PERL_ARGS_ASSERT_OPSLAB_FORCE_FREE; slab2 = slab; do { OPSLOT *slot; for (slot = slab2->opslab_first; slot->opslot_next; slot = slot->opslot_next) { if (slot->opslot_op.op_type != OP_FREED && !(slot->opslot_op.op_savefree #ifdef DEBUGGING && ++savestack_count #endif ) ) { assert(slot->opslot_op.op_slabbed); op_free(&slot->opslot_op); if (slab->opslab_refcnt == 1) goto free; } } } while ((slab2 = slab2->opslab_next)); /* > 1 because the CV still holds a reference count. */ if (slab->opslab_refcnt > 1) { /* still referenced by the savestack */ #ifdef DEBUGGING assert(savestack_count == slab->opslab_refcnt-1); #endif /* Remove the CV’s reference count. */ slab->opslab_refcnt--; return; } free: opslab_free(slab); } #ifdef PERL_DEBUG_READONLY_OPS OP * Perl_op_refcnt_inc(pTHX_ OP *o) { if(o) { OPSLAB *const slab = o->op_slabbed ? OpSLAB(o) : NULL; if (slab && slab->opslab_readonly) { Slab_to_rw(slab); ++o->op_targ; Slab_to_ro(slab); } else { ++o->op_targ; } } return o; } PADOFFSET Perl_op_refcnt_dec(pTHX_ OP *o) { PADOFFSET result; OPSLAB *const slab = o->op_slabbed ? OpSLAB(o) : NULL; PERL_ARGS_ASSERT_OP_REFCNT_DEC; if (slab && slab->opslab_readonly) { Slab_to_rw(slab); result = --o->op_targ; Slab_to_ro(slab); } else { result = --o->op_targ; } return result; } #endif /* * In the following definition, the ", (OP*)0" is just to make the compiler * think the expression is of the right type: croak actually does a Siglongjmp. */ #define CHECKOP(type,o) \ ((PL_op_mask && PL_op_mask[type]) \ ? ( op_free((OP*)o), \ Perl_croak(aTHX_ "'%s' trapped by operation mask", PL_op_desc[type]), \ (OP*)0 ) \ : PL_check[type](aTHX_ (OP*)o)) #define RETURN_UNLIMITED_NUMBER (PERL_INT_MAX / 2) #define OpTYPE_set(o,type) \ STMT_START { \ o->op_type = (OPCODE)type; \ o->op_ppaddr = PL_ppaddr[type]; \ } STMT_END STATIC OP * S_no_fh_allowed(pTHX_ OP *o) { PERL_ARGS_ASSERT_NO_FH_ALLOWED; yyerror(Perl_form(aTHX_ "Missing comma after first argument to %s function", OP_DESC(o))); return o; } STATIC OP * S_too_few_arguments_pv(pTHX_ OP *o, const char* name, U32 flags) { PERL_ARGS_ASSERT_TOO_FEW_ARGUMENTS_PV; yyerror_pv(Perl_form(aTHX_ "Not enough arguments for %s", name), flags); return o; } STATIC OP * S_too_many_arguments_pv(pTHX_ OP *o, const char *name, U32 flags) { PERL_ARGS_ASSERT_TOO_MANY_ARGUMENTS_PV; yyerror_pv(Perl_form(aTHX_ "Too many arguments for %s", name), flags); return o; } STATIC void S_bad_type_pv(pTHX_ I32 n, const char *t, const OP *o, const OP *kid) { PERL_ARGS_ASSERT_BAD_TYPE_PV; yyerror_pv(Perl_form(aTHX_ "Type of arg %d to %s must be %s (not %s)", (int)n, PL_op_desc[(o)->op_type], t, OP_DESC(kid)), 0); } /* remove flags var, its unused in all callers, move to to right end since gv and kid are always the same */ STATIC void S_bad_type_gv(pTHX_ I32 n, GV *gv, const OP *kid, const char *t) { SV * const namesv = cv_name((CV *)gv, NULL, 0); PERL_ARGS_ASSERT_BAD_TYPE_GV; yyerror_pv(Perl_form(aTHX_ "Type of arg %d to %" SVf " must be %s (not %s)", (int)n, SVfARG(namesv), t, OP_DESC(kid)), SvUTF8(namesv)); } STATIC void S_no_bareword_allowed(pTHX_ OP *o) { PERL_ARGS_ASSERT_NO_BAREWORD_ALLOWED; qerror(Perl_mess(aTHX_ "Bareword \"%" SVf "\" not allowed while \"strict subs\" in use", SVfARG(cSVOPo_sv))); o->op_private &= ~OPpCONST_STRICT; /* prevent warning twice about the same OP */ } /* "register" allocation */ PADOFFSET Perl_allocmy(pTHX_ const char *const name, const STRLEN len, const U32 flags) { PADOFFSET off; const bool is_our = (PL_parser->in_my == KEY_our); PERL_ARGS_ASSERT_ALLOCMY; if (flags & ~SVf_UTF8) Perl_croak(aTHX_ "panic: allocmy illegal flag bits 0x%" UVxf, (UV)flags); /* complain about "my $" etc etc */ if ( len && !( is_our || isALPHA(name[1]) || ( (flags & SVf_UTF8) && isIDFIRST_utf8_safe((U8 *)name+1, name + len)) || (name[1] == '_' && len > 2))) { if (!(flags & SVf_UTF8 && UTF8_IS_START(name[1])) && isASCII(name[1]) && (!isPRINT(name[1]) || strchr("\t\n\r\f", name[1]))) { /* diag_listed_as: Can't use global %s in "%s" */ yyerror(Perl_form(aTHX_ "Can't use global %c^%c%.*s in \"%s\"", name[0], toCTRL(name[1]), (int)(len - 2), name + 2, PL_parser->in_my == KEY_state ? "state" : "my")); } else { yyerror_pv(Perl_form(aTHX_ "Can't use global %.*s in \"%s\"", (int) len, name, PL_parser->in_my == KEY_state ? "state" : "my"), flags & SVf_UTF8); } } /* allocate a spare slot and store the name in that slot */ off = pad_add_name_pvn(name, len, (is_our ? padadd_OUR : PL_parser->in_my == KEY_state ? padadd_STATE : 0), PL_parser->in_my_stash, (is_our /* $_ is always in main::, even with our */ ? (PL_curstash && !memEQs(name,len,"$_") ? PL_curstash : PL_defstash) : NULL ) ); /* anon sub prototypes contains state vars should always be cloned, * otherwise the state var would be shared between anon subs */ if (PL_parser->in_my == KEY_state && CvANON(PL_compcv)) CvCLONE_on(PL_compcv); return off; } /* =head1 Optree Manipulation Functions =for apidoc alloccopstash Available only under threaded builds, this function allocates an entry in C for the stash passed to it. =cut */ #ifdef USE_ITHREADS PADOFFSET Perl_alloccopstash(pTHX_ HV *hv) { PADOFFSET off = 0, o = 1; bool found_slot = FALSE; PERL_ARGS_ASSERT_ALLOCCOPSTASH; if (PL_stashpad[PL_stashpadix] == hv) return PL_stashpadix; for (; o < PL_stashpadmax; ++o) { if (PL_stashpad[o] == hv) return PL_stashpadix = o; if (!PL_stashpad[o] || SvTYPE(PL_stashpad[o]) != SVt_PVHV) found_slot = TRUE, off = o; } if (!found_slot) { Renew(PL_stashpad, PL_stashpadmax + 10, HV *); Zero(PL_stashpad + PL_stashpadmax, 10, HV *); off = PL_stashpadmax; PL_stashpadmax += 10; } PL_stashpad[PL_stashpadix = off] = hv; return off; } #endif /* free the body of an op without examining its contents. * Always use this rather than FreeOp directly */ static void S_op_destroy(pTHX_ OP *o) { FreeOp(o); } /* Destructor */ /* =for apidoc Am|void|op_free|OP *o Free an op. Only use this when an op is no longer linked to from any optree. =cut */ void Perl_op_free(pTHX_ OP *o) { dVAR; OPCODE type; SSize_t defer_ix = -1; SSize_t defer_stack_alloc = 0; OP **defer_stack = NULL; do { /* Though ops may be freed twice, freeing the op after its slab is a big no-no. */ assert(!o || !o->op_slabbed || OpSLAB(o)->opslab_refcnt != ~(size_t)0); /* During the forced freeing of ops after compilation failure, kidops may be freed before their parents. */ if (!o || o->op_type == OP_FREED) continue; type = o->op_type; /* an op should only ever acquire op_private flags that we know about. * If this fails, you may need to fix something in regen/op_private. * Don't bother testing if: * * the op_ppaddr doesn't match the op; someone may have * overridden the op and be doing strange things with it; * * we've errored, as op flags are often left in an * inconsistent state then. Note that an error when * compiling the main program leaves PL_parser NULL, so * we can't spot faults in the main code, only * evaled/required code */ #ifdef DEBUGGING if ( o->op_ppaddr == PL_ppaddr[o->op_type] && PL_parser && !PL_parser->error_count) { assert(!(o->op_private & ~PL_op_private_valid[type])); } #endif if (o->op_private & OPpREFCOUNTED) { switch (type) { case OP_LEAVESUB: case OP_LEAVESUBLV: case OP_LEAVEEVAL: case OP_LEAVE: case OP_SCOPE: case OP_LEAVEWRITE: { PADOFFSET refcnt; OP_REFCNT_LOCK; refcnt = OpREFCNT_dec(o); OP_REFCNT_UNLOCK; if (refcnt) { /* Need to find and remove any pattern match ops from the list we maintain for reset(). */ find_and_forget_pmops(o); continue; } } break; default: break; } } /* Call the op_free hook if it has been set. Do it now so that it's called * at the right time for refcounted ops, but still before all of the kids * are freed. */ CALL_OPFREEHOOK(o); if (o->op_flags & OPf_KIDS) { OP *kid, *nextkid; for (kid = cUNOPo->op_first; kid; kid = nextkid) { nextkid = OpSIBLING(kid); /* Get before next freeing kid */ if (!kid || kid->op_type == OP_FREED) /* During the forced freeing of ops after compilation failure, kidops may be freed before their parents. */ continue; if (!(kid->op_flags & OPf_KIDS)) /* If it has no kids, just free it now */ op_free(kid); else DEFER_OP(kid); } } if (type == OP_NULL) type = (OPCODE)o->op_targ; if (o->op_slabbed) Slab_to_rw(OpSLAB(o)); /* COP* is not cleared by op_clear() so that we may track line * numbers etc even after null() */ if (type == OP_NEXTSTATE || type == OP_DBSTATE) { cop_free((COP*)o); } op_clear(o); FreeOp(o); if (PL_op == o) PL_op = NULL; } while ( (o = POP_DEFERRED_OP()) ); Safefree(defer_stack); } /* S_op_clear_gv(): free a GV attached to an OP */ STATIC #ifdef USE_ITHREADS void S_op_clear_gv(pTHX_ OP *o, PADOFFSET *ixp) #else void S_op_clear_gv(pTHX_ OP *o, SV**svp) #endif { GV *gv = (o->op_type == OP_GV || o->op_type == OP_GVSV || o->op_type == OP_MULTIDEREF) #ifdef USE_ITHREADS && PL_curpad ? ((GV*)PAD_SVl(*ixp)) : NULL; #else ? (GV*)(*svp) : NULL; #endif /* It's possible during global destruction that the GV is freed before the optree. Whilst the SvREFCNT_inc is happy to bump from 0 to 1 on a freed SV, the corresponding SvREFCNT_dec from 1 to 0 will trigger an assertion failure, because the entry to sv_clear checks that the scalar is not already freed. A check of for !SvIS_FREED(gv) turns out to be invalid, because during global destruction the reference count can be forced down to zero (with SVf_BREAK set). In which case raising to 1 and then dropping to 0 triggers cleanup before it should happen. I *think* that this might actually be a general, systematic, weakness of the whole idea of SVf_BREAK, in that code *is* allowed to raise and lower references during global destruction, so any *valid* code that happens to do this during global destruction might well trigger premature cleanup. */ bool still_valid = gv && SvREFCNT(gv); if (still_valid) SvREFCNT_inc_simple_void(gv); #ifdef USE_ITHREADS if (*ixp > 0) { pad_swipe(*ixp, TRUE); *ixp = 0; } #else SvREFCNT_dec(*svp); *svp = NULL; #endif if (still_valid) { int try_downgrade = SvREFCNT(gv) == 2; SvREFCNT_dec_NN(gv); if (try_downgrade) gv_try_downgrade(gv); } } void Perl_op_clear(pTHX_ OP *o) { dVAR; PERL_ARGS_ASSERT_OP_CLEAR; switch (o->op_type) { case OP_NULL: /* Was holding old type, if any. */ /* FALLTHROUGH */ case OP_ENTERTRY: case OP_ENTEREVAL: /* Was holding hints. */ case OP_ARGDEFELEM: /* Was holding signature index. */ o->op_targ = 0; break; default: if (!(o->op_flags & OPf_REF) || (PL_check[o->op_type] != Perl_ck_ftst)) break; /* FALLTHROUGH */ case OP_GVSV: case OP_GV: case OP_AELEMFAST: #ifdef USE_ITHREADS S_op_clear_gv(aTHX_ o, &(cPADOPx(o)->op_padix)); #else S_op_clear_gv(aTHX_ o, &(cSVOPx(o)->op_sv)); #endif break; case OP_METHOD_REDIR: case OP_METHOD_REDIR_SUPER: #ifdef USE_ITHREADS if (cMETHOPx(o)->op_rclass_targ) { pad_swipe(cMETHOPx(o)->op_rclass_targ, 1); cMETHOPx(o)->op_rclass_targ = 0; } #else SvREFCNT_dec(cMETHOPx(o)->op_rclass_sv); cMETHOPx(o)->op_rclass_sv = NULL; #endif /* FALLTHROUGH */ case OP_METHOD_NAMED: case OP_METHOD_SUPER: SvREFCNT_dec(cMETHOPx(o)->op_u.op_meth_sv); cMETHOPx(o)->op_u.op_meth_sv = NULL; #ifdef USE_ITHREADS if (o->op_targ) { pad_swipe(o->op_targ, 1); o->op_targ = 0; } #endif break; case OP_CONST: case OP_HINTSEVAL: SvREFCNT_dec(cSVOPo->op_sv); cSVOPo->op_sv = NULL; #ifdef USE_ITHREADS /** Bug #15654 Even if op_clear does a pad_free for the target of the op, pad_free doesn't actually remove the sv that exists in the pad; instead it lives on. This results in that it could be reused as a target later on when the pad was reallocated. **/ if(o->op_targ) { pad_swipe(o->op_targ,1); o->op_targ = 0; } #endif break; case OP_DUMP: case OP_GOTO: case OP_NEXT: case OP_LAST: case OP_REDO: if (o->op_flags & (OPf_SPECIAL|OPf_STACKED|OPf_KIDS)) break; /* FALLTHROUGH */ case OP_TRANS: case OP_TRANSR: if ( (o->op_type == OP_TRANS || o->op_type == OP_TRANSR) && (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF))) { #ifdef USE_ITHREADS if (cPADOPo->op_padix > 0) { pad_swipe(cPADOPo->op_padix, TRUE); cPADOPo->op_padix = 0; } #else SvREFCNT_dec(cSVOPo->op_sv); cSVOPo->op_sv = NULL; #endif } else { PerlMemShared_free(cPVOPo->op_pv); cPVOPo->op_pv = NULL; } break; case OP_SUBST: op_free(cPMOPo->op_pmreplrootu.op_pmreplroot); goto clear_pmop; case OP_SPLIT: if ( (o->op_private & OPpSPLIT_ASSIGN) /* @array = split */ && !(o->op_flags & OPf_STACKED)) /* @{expr} = split */ { if (o->op_private & OPpSPLIT_LEX) pad_free(cPMOPo->op_pmreplrootu.op_pmtargetoff); else #ifdef USE_ITHREADS pad_swipe(cPMOPo->op_pmreplrootu.op_pmtargetoff, TRUE); #else SvREFCNT_dec(MUTABLE_SV(cPMOPo->op_pmreplrootu.op_pmtargetgv)); #endif } /* FALLTHROUGH */ case OP_MATCH: case OP_QR: clear_pmop: if (!(cPMOPo->op_pmflags & PMf_CODELIST_PRIVATE)) op_free(cPMOPo->op_code_list); cPMOPo->op_code_list = NULL; forget_pmop(cPMOPo); cPMOPo->op_pmreplrootu.op_pmreplroot = NULL; /* we use the same protection as the "SAFE" version of the PM_ macros * here since sv_clean_all might release some PMOPs * after PL_regex_padav has been cleared * and the clearing of PL_regex_padav needs to * happen before sv_clean_all */ #ifdef USE_ITHREADS if(PL_regex_pad) { /* We could be in destruction */ const IV offset = (cPMOPo)->op_pmoffset; ReREFCNT_dec(PM_GETRE(cPMOPo)); PL_regex_pad[offset] = &PL_sv_undef; sv_catpvn_nomg(PL_regex_pad[0], (const char *)&offset, sizeof(offset)); } #else ReREFCNT_dec(PM_GETRE(cPMOPo)); PM_SETRE(cPMOPo, NULL); #endif break; case OP_ARGCHECK: PerlMemShared_free(cUNOP_AUXo->op_aux); break; case OP_MULTICONCAT: { UNOP_AUX_item *aux = cUNOP_AUXo->op_aux; /* aux[PERL_MULTICONCAT_IX_PLAIN_PV] and/or * aux[PERL_MULTICONCAT_IX_UTF8_PV] point to plain and/or * utf8 shared strings */ char *p1 = aux[PERL_MULTICONCAT_IX_PLAIN_PV].pv; char *p2 = aux[PERL_MULTICONCAT_IX_UTF8_PV].pv; if (p1) PerlMemShared_free(p1); if (p2 && p1 != p2) PerlMemShared_free(p2); PerlMemShared_free(aux); } break; case OP_MULTIDEREF: { UNOP_AUX_item *items = cUNOP_AUXo->op_aux; UV actions = items->uv; bool last = 0; bool is_hash = FALSE; while (!last) { switch (actions & MDEREF_ACTION_MASK) { case MDEREF_reload: actions = (++items)->uv; continue; case MDEREF_HV_padhv_helem: is_hash = TRUE; /* FALLTHROUGH */ case MDEREF_AV_padav_aelem: pad_free((++items)->pad_offset); goto do_elem; case MDEREF_HV_gvhv_helem: is_hash = TRUE; /* FALLTHROUGH */ case MDEREF_AV_gvav_aelem: #ifdef USE_ITHREADS S_op_clear_gv(aTHX_ o, &((++items)->pad_offset)); #else S_op_clear_gv(aTHX_ o, &((++items)->sv)); #endif goto do_elem; case MDEREF_HV_gvsv_vivify_rv2hv_helem: is_hash = TRUE; /* FALLTHROUGH */ case MDEREF_AV_gvsv_vivify_rv2av_aelem: #ifdef USE_ITHREADS S_op_clear_gv(aTHX_ o, &((++items)->pad_offset)); #else S_op_clear_gv(aTHX_ o, &((++items)->sv)); #endif goto do_vivify_rv2xv_elem; case MDEREF_HV_padsv_vivify_rv2hv_helem: is_hash = TRUE; /* FALLTHROUGH */ case MDEREF_AV_padsv_vivify_rv2av_aelem: pad_free((++items)->pad_offset); goto do_vivify_rv2xv_elem; case MDEREF_HV_pop_rv2hv_helem: case MDEREF_HV_vivify_rv2hv_helem: is_hash = TRUE; /* FALLTHROUGH */ do_vivify_rv2xv_elem: case MDEREF_AV_pop_rv2av_aelem: case MDEREF_AV_vivify_rv2av_aelem: do_elem: switch (actions & MDEREF_INDEX_MASK) { case MDEREF_INDEX_none: last = 1; break; case MDEREF_INDEX_const: if (is_hash) { #ifdef USE_ITHREADS /* see RT #15654 */ pad_swipe((++items)->pad_offset, 1); #else SvREFCNT_dec((++items)->sv); #endif } else items++; break; case MDEREF_INDEX_padsv: pad_free((++items)->pad_offset); break; case MDEREF_INDEX_gvsv: #ifdef USE_ITHREADS S_op_clear_gv(aTHX_ o, &((++items)->pad_offset)); #else S_op_clear_gv(aTHX_ o, &((++items)->sv)); #endif break; } if (actions & MDEREF_FLAG_last) last = 1; is_hash = FALSE; break; default: assert(0); last = 1; break; } /* switch */ actions >>= MDEREF_SHIFT; } /* while */ /* start of malloc is at op_aux[-1], where the length is * stored */ PerlMemShared_free(cUNOP_AUXo->op_aux - 1); } break; } if (o->op_targ > 0) { pad_free(o->op_targ); o->op_targ = 0; } } STATIC void S_cop_free(pTHX_ COP* cop) { PERL_ARGS_ASSERT_COP_FREE; CopFILE_free(cop); if (! specialWARN(cop->cop_warnings)) PerlMemShared_free(cop->cop_warnings); cophh_free(CopHINTHASH_get(cop)); if (PL_curcop == cop) PL_curcop = NULL; } STATIC void S_forget_pmop(pTHX_ PMOP *const o ) { HV * const pmstash = PmopSTASH(o); PERL_ARGS_ASSERT_FORGET_PMOP; if (pmstash && !SvIS_FREED(pmstash) && SvMAGICAL(pmstash)) { MAGIC * const mg = mg_find((const SV *)pmstash, PERL_MAGIC_symtab); if (mg) { PMOP **const array = (PMOP**) mg->mg_ptr; U32 count = mg->mg_len / sizeof(PMOP**); U32 i = count; while (i--) { if (array[i] == o) { /* Found it. Move the entry at the end to overwrite it. */ array[i] = array[--count]; mg->mg_len = count * sizeof(PMOP**); /* Could realloc smaller at this point always, but probably not worth it. Probably worth free()ing if we're the last. */ if(!count) { Safefree(mg->mg_ptr); mg->mg_ptr = NULL; } break; } } } } if (PL_curpm == o) PL_curpm = NULL; } STATIC void S_find_and_forget_pmops(pTHX_ OP *o) { PERL_ARGS_ASSERT_FIND_AND_FORGET_PMOPS; if (o->op_flags & OPf_KIDS) { OP *kid = cUNOPo->op_first; while (kid) { switch (kid->op_type) { case OP_SUBST: case OP_SPLIT: case OP_MATCH: case OP_QR: forget_pmop((PMOP*)kid); } find_and_forget_pmops(kid); kid = OpSIBLING(kid); } } } /* =for apidoc Am|void|op_null|OP *o Neutralizes an op when it is no longer needed, but is still linked to from other ops. =cut */ void Perl_op_null(pTHX_ OP *o) { dVAR; PERL_ARGS_ASSERT_OP_NULL; if (o->op_type == OP_NULL) return; op_clear(o); o->op_targ = o->op_type; OpTYPE_set(o, OP_NULL); } void Perl_op_refcnt_lock(pTHX) PERL_TSA_ACQUIRE(PL_op_mutex) { #ifdef USE_ITHREADS dVAR; #endif PERL_UNUSED_CONTEXT; OP_REFCNT_LOCK; } void Perl_op_refcnt_unlock(pTHX) PERL_TSA_RELEASE(PL_op_mutex) { #ifdef USE_ITHREADS dVAR; #endif PERL_UNUSED_CONTEXT; OP_REFCNT_UNLOCK; } /* =for apidoc op_sibling_splice A general function for editing the structure of an existing chain of op_sibling nodes. By analogy with the perl-level C function, allows you to delete zero or more sequential nodes, replacing them with zero or more different nodes. Performs the necessary op_first/op_last housekeeping on the parent node and op_sibling manipulation on the children. The last deleted node will be marked as as the last node by updating the op_sibling/op_sibparent or op_moresib field as appropriate. Note that op_next is not manipulated, and nodes are not freed; that is the responsibility of the caller. It also won't create a new list op for an empty list etc; use higher-level functions like op_append_elem() for that. C is the parent node of the sibling chain. It may passed as C if the splicing doesn't affect the first or last op in the chain. C is the node preceding the first node to be spliced. Node(s) following it will be deleted, and ops will be inserted after it. If it is C, the first node onwards is deleted, and nodes are inserted at the beginning. C is the number of nodes to delete. If zero, no nodes are deleted. If -1 or greater than or equal to the number of remaining kids, all remaining kids are deleted. C is the first of a chain of nodes to be inserted in place of the nodes. If C, no nodes are inserted. The head of the chain of deleted ops is returned, or C if no ops were deleted. For example: action before after returns ------ ----- ----- ------- P P splice(P, A, 2, X-Y-Z) | | B-C A-B-C-D A-X-Y-Z-D P P splice(P, NULL, 1, X-Y) | | A A-B-C-D X-Y-B-C-D P P splice(P, NULL, 3, NULL) | | A-B-C A-B-C-D D P P splice(P, B, 0, X-Y) | | NULL A-B-C-D A-B-X-Y-C-D For lower-level direct manipulation of C and C, see C>, C>, C>. =cut */ OP * Perl_op_sibling_splice(OP *parent, OP *start, int del_count, OP* insert) { OP *first; OP *rest; OP *last_del = NULL; OP *last_ins = NULL; if (start) first = OpSIBLING(start); else if (!parent) goto no_parent; else first = cLISTOPx(parent)->op_first; assert(del_count >= -1); if (del_count && first) { last_del = first; while (--del_count && OpHAS_SIBLING(last_del)) last_del = OpSIBLING(last_del); rest = OpSIBLING(last_del); OpLASTSIB_set(last_del, NULL); } else rest = first; if (insert) { last_ins = insert; while (OpHAS_SIBLING(last_ins)) last_ins = OpSIBLING(last_ins); OpMAYBESIB_set(last_ins, rest, NULL); } else insert = rest; if (start) { OpMAYBESIB_set(start, insert, NULL); } else { if (!parent) goto no_parent; cLISTOPx(parent)->op_first = insert; if (insert) parent->op_flags |= OPf_KIDS; else parent->op_flags &= ~OPf_KIDS; } if (!rest) { /* update op_last etc */ U32 type; OP *lastop; if (!parent) goto no_parent; /* ought to use OP_CLASS(parent) here, but that can't handle * ex-foo OP_NULL ops. Also note that XopENTRYCUSTOM() can't * either */ type = parent->op_type; if (type == OP_CUSTOM) { dTHX; type = XopENTRYCUSTOM(parent, xop_class); } else { if (type == OP_NULL) type = parent->op_targ; type = PL_opargs[type] & OA_CLASS_MASK; } lastop = last_ins ? last_ins : start ? start : NULL; if ( type == OA_BINOP || type == OA_LISTOP || type == OA_PMOP || type == OA_LOOP ) cLISTOPx(parent)->op_last = lastop; if (lastop) OpLASTSIB_set(lastop, parent); } return last_del ? first : NULL; no_parent: Perl_croak_nocontext("panic: op_sibling_splice(): NULL parent"); } #ifdef PERL_OP_PARENT /* =for apidoc op_parent Returns the parent OP of C, if it has a parent. Returns C otherwise. This function is only available on perls built with C<-DPERL_OP_PARENT>. =cut */ OP * Perl_op_parent(OP *o) { PERL_ARGS_ASSERT_OP_PARENT; while (OpHAS_SIBLING(o)) o = OpSIBLING(o); return o->op_sibparent; } #endif /* replace the sibling following start with a new UNOP, which becomes * the parent of the original sibling; e.g. * * op_sibling_newUNOP(P, A, unop-args...) * * P P * | becomes | * A-B-C A-U-C * | * B * * where U is the new UNOP. * * parent and start args are the same as for op_sibling_splice(); * type and flags args are as newUNOP(). * * Returns the new UNOP. */ STATIC OP * S_op_sibling_newUNOP(pTHX_ OP *parent, OP *start, I32 type, I32 flags) { OP *kid, *newop; kid = op_sibling_splice(parent, start, 1, NULL); newop = newUNOP(type, flags, kid); op_sibling_splice(parent, start, 0, newop); return newop; } /* lowest-level newLOGOP-style function - just allocates and populates * the struct. Higher-level stuff should be done by S_new_logop() / * newLOGOP(). This function exists mainly to avoid op_first assignment * being spread throughout this file. */ LOGOP * Perl_alloc_LOGOP(pTHX_ I32 type, OP *first, OP* other) { dVAR; LOGOP *logop; OP *kid = first; NewOp(1101, logop, 1, LOGOP); OpTYPE_set(logop, type); logop->op_first = first; logop->op_other = other; logop->op_flags = OPf_KIDS; while (kid && OpHAS_SIBLING(kid)) kid = OpSIBLING(kid); if (kid) OpLASTSIB_set(kid, (OP*)logop); return logop; } /* Contextualizers */ /* =for apidoc Am|OP *|op_contextualize|OP *o|I32 context Applies a syntactic context to an op tree representing an expression. C is the op tree, and C must be C, C, or C to specify the context to apply. The modified op tree is returned. =cut */ OP * Perl_op_contextualize(pTHX_ OP *o, I32 context) { PERL_ARGS_ASSERT_OP_CONTEXTUALIZE; switch (context) { case G_SCALAR: return scalar(o); case G_ARRAY: return list(o); case G_VOID: return scalarvoid(o); default: Perl_croak(aTHX_ "panic: op_contextualize bad context %ld", (long) context); } } /* =for apidoc Am|OP*|op_linklist|OP *o This function is the implementation of the L macro. It should not be called directly. =cut */ OP * Perl_op_linklist(pTHX_ OP *o) { OP *first; PERL_ARGS_ASSERT_OP_LINKLIST; if (o->op_next) return o->op_next; /* establish postfix order */ first = cUNOPo->op_first; if (first) { OP *kid; o->op_next = LINKLIST(first); kid = first; for (;;) { OP *sibl = OpSIBLING(kid); if (sibl) { kid->op_next = LINKLIST(sibl); kid = sibl; } else { kid->op_next = o; break; } } } else o->op_next = o; return o->op_next; } static OP * S_scalarkids(pTHX_ OP *o) { if (o && o->op_flags & OPf_KIDS) { OP *kid; for (kid = cLISTOPo->op_first; kid; kid = OpSIBLING(kid)) scalar(kid); } return o; } STATIC OP * S_scalarboolean(pTHX_ OP *o) { PERL_ARGS_ASSERT_SCALARBOOLEAN; if ((o->op_type == OP_SASSIGN && cBINOPo->op_first->op_type == OP_CONST && !(cBINOPo->op_first->op_flags & OPf_SPECIAL)) || (o->op_type == OP_NOT && cUNOPo->op_first->op_type == OP_SASSIGN && cBINOPx(cUNOPo->op_first)->op_first->op_type == OP_CONST && !(cBINOPx(cUNOPo->op_first)->op_first->op_flags & OPf_SPECIAL))) { if (ckWARN(WARN_SYNTAX)) { const line_t oldline = CopLINE(PL_curcop); if (PL_parser && PL_parser->copline != NOLINE) { /* This ensures that warnings are reported at the first line of the conditional, not the last. */ CopLINE_set(PL_curcop, PL_parser->copline); } Perl_warner(aTHX_ packWARN(WARN_SYNTAX), "Found = in conditional, should be =="); CopLINE_set(PL_curcop, oldline); } } return scalar(o); } static SV * S_op_varname_subscript(pTHX_ const OP *o, int subscript_type) { assert(o); assert(o->op_type == OP_PADAV || o->op_type == OP_RV2AV || o->op_type == OP_PADHV || o->op_type == OP_RV2HV); { const char funny = o->op_type == OP_PADAV || o->op_type == OP_RV2AV ? '@' : '%'; if (o->op_type == OP_RV2AV || o->op_type == OP_RV2HV) { GV *gv; if (cUNOPo->op_first->op_type != OP_GV || !(gv = cGVOPx_gv(cUNOPo->op_first))) return NULL; return varname(gv, funny, 0, NULL, 0, subscript_type); } return varname(MUTABLE_GV(PL_compcv), funny, o->op_targ, NULL, 0, subscript_type); } } static SV * S_op_varname(pTHX_ const OP *o) { return S_op_varname_subscript(aTHX_ o, 1); } static void S_op_pretty(pTHX_ const OP *o, SV **retsv, const char **retpv) { /* or not so pretty :-) */ if (o->op_type == OP_CONST) { *retsv = cSVOPo_sv; if (SvPOK(*retsv)) { SV *sv = *retsv; *retsv = sv_newmortal(); pv_pretty(*retsv, SvPVX_const(sv), SvCUR(sv), 32, NULL, NULL, PERL_PV_PRETTY_DUMP |PERL_PV_ESCAPE_UNI_DETECT); } else if (!SvOK(*retsv)) *retpv = "undef"; } else *retpv = "..."; } static void S_scalar_slice_warning(pTHX_ const OP *o) { OP *kid; const bool h = o->op_type == OP_HSLICE || (o->op_type == OP_NULL && o->op_targ == OP_HSLICE); const char lbrack = h ? '{' : '['; const char rbrack = h ? '}' : ']'; SV *name; SV *keysv = NULL; /* just to silence compiler warnings */ const char *key = NULL; if (!(o->op_private & OPpSLICEWARNING)) return; if (PL_parser && PL_parser->error_count) /* This warning can be nonsensical when there is a syntax error. */ return; kid = cLISTOPo->op_first; kid = OpSIBLING(kid); /* get past pushmark */ /* weed out false positives: any ops that can return lists */ switch (kid->op_type) { case OP_BACKTICK: case OP_GLOB: case OP_READLINE: case OP_MATCH: case OP_RV2AV: case OP_EACH: case OP_VALUES: case OP_KEYS: case OP_SPLIT: case OP_LIST: case OP_SORT: case OP_REVERSE: case OP_ENTERSUB: case OP_CALLER: case OP_LSTAT: case OP_STAT: case OP_READDIR: case OP_SYSTEM: case OP_TMS: case OP_LOCALTIME: case OP_GMTIME: case OP_ENTEREVAL: return; } /* Don't warn if we have a nulled list either. */ if (kid->op_type == OP_NULL && kid->op_targ == OP_LIST) return; assert(OpSIBLING(kid)); name = S_op_varname(aTHX_ OpSIBLING(kid)); if (!name) /* XS module fiddling with the op tree */ return; S_op_pretty(aTHX_ kid, &keysv, &key); assert(SvPOK(name)); sv_chop(name,SvPVX(name)+1); if (key) /* diag_listed_as: Scalar value @%s[%s] better written as $%s[%s] */ Perl_warner(aTHX_ packWARN(WARN_SYNTAX), "Scalar value @%" SVf "%c%s%c better written as $%" SVf "%c%s%c", SVfARG(name), lbrack, key, rbrack, SVfARG(name), lbrack, key, rbrack); else /* diag_listed_as: Scalar value @%s[%s] better written as $%s[%s] */ Perl_warner(aTHX_ packWARN(WARN_SYNTAX), "Scalar value @%" SVf "%c%" SVf "%c better written as $%" SVf "%c%" SVf "%c", SVfARG(name), lbrack, SVfARG(keysv), rbrack, SVfARG(name), lbrack, SVfARG(keysv), rbrack); } OP * Perl_scalar(pTHX_ OP *o) { OP *kid; /* assumes no premature commitment */ if (!o || (PL_parser && PL_parser->error_count) || (o->op_flags & OPf_WANT) || o->op_type == OP_RETURN) { return o; } o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_SCALAR; switch (o->op_type) { case OP_REPEAT: scalar(cBINOPo->op_first); if (o->op_private & OPpREPEAT_DOLIST) { kid = cLISTOPx(cUNOPo->op_first)->op_first; assert(kid->op_type == OP_PUSHMARK); if (OpHAS_SIBLING(kid) && !OpHAS_SIBLING(OpSIBLING(kid))) { op_null(cLISTOPx(cUNOPo->op_first)->op_first); o->op_private &=~ OPpREPEAT_DOLIST; } } break; case OP_OR: case OP_AND: case OP_COND_EXPR: for (kid = OpSIBLING(cUNOPo->op_first); kid; kid = OpSIBLING(kid)) scalar(kid); break; /* FALLTHROUGH */ case OP_SPLIT: case OP_MATCH: case OP_QR: case OP_SUBST: case OP_NULL: default: if (o->op_flags & OPf_KIDS) { for (kid = cUNOPo->op_first; kid; kid = OpSIBLING(kid)) scalar(kid); } break; case OP_LEAVE: case OP_LEAVETRY: kid = cLISTOPo->op_first; scalar(kid); kid = OpSIBLING(kid); do_kids: while (kid) { OP *sib = OpSIBLING(kid); if (sib && kid->op_type != OP_LEAVEWHEN && ( OpHAS_SIBLING(sib) || sib->op_type != OP_NULL || ( sib->op_targ != OP_NEXTSTATE && sib->op_targ != OP_DBSTATE ))) scalarvoid(kid); else scalar(kid); kid = sib; } PL_curcop = &PL_compiling; break; case OP_SCOPE: case OP_LINESEQ: case OP_LIST: kid = cLISTOPo->op_first; goto do_kids; case OP_SORT: Perl_ck_warner(aTHX_ packWARN(WARN_VOID), "Useless use of sort in scalar context"); break; case OP_KVHSLICE: case OP_KVASLICE: { /* Warn about scalar context */ const char lbrack = o->op_type == OP_KVHSLICE ? '{' : '['; const char rbrack = o->op_type == OP_KVHSLICE ? '}' : ']'; SV *name; SV *keysv; const char *key = NULL; /* This warning can be nonsensical when there is a syntax error. */ if (PL_parser && PL_parser->error_count) break; if (!ckWARN(WARN_SYNTAX)) break; kid = cLISTOPo->op_first; kid = OpSIBLING(kid); /* get past pushmark */ assert(OpSIBLING(kid)); name = S_op_varname(aTHX_ OpSIBLING(kid)); if (!name) /* XS module fiddling with the op tree */ break; S_op_pretty(aTHX_ kid, &keysv, &key); assert(SvPOK(name)); sv_chop(name,SvPVX(name)+1); if (key) /* diag_listed_as: %%s[%s] in scalar context better written as $%s[%s] */ Perl_warner(aTHX_ packWARN(WARN_SYNTAX), "%%%" SVf "%c%s%c in scalar context better written " "as $%" SVf "%c%s%c", SVfARG(name), lbrack, key, rbrack, SVfARG(name), lbrack, key, rbrack); else /* diag_listed_as: %%s[%s] in scalar context better written as $%s[%s] */ Perl_warner(aTHX_ packWARN(WARN_SYNTAX), "%%%" SVf "%c%" SVf "%c in scalar context better " "written as $%" SVf "%c%" SVf "%c", SVfARG(name), lbrack, SVfARG(keysv), rbrack, SVfARG(name), lbrack, SVfARG(keysv), rbrack); } } return o; } OP * Perl_scalarvoid(pTHX_ OP *arg) { dVAR; OP *kid; SV* sv; SSize_t defer_stack_alloc = 0; SSize_t defer_ix = -1; OP **defer_stack = NULL; OP *o = arg; PERL_ARGS_ASSERT_SCALARVOID; do { U8 want; SV *useless_sv = NULL; const char* useless = NULL; if (o->op_type == OP_NEXTSTATE || o->op_type == OP_DBSTATE || (o->op_type == OP_NULL && (o->op_targ == OP_NEXTSTATE || o->op_targ == OP_DBSTATE))) PL_curcop = (COP*)o; /* for warning below */ /* assumes no premature commitment */ want = o->op_flags & OPf_WANT; if ((want && want != OPf_WANT_SCALAR) || (PL_parser && PL_parser->error_count) || o->op_type == OP_RETURN || o->op_type == OP_REQUIRE || o->op_type == OP_LEAVEWHEN) { continue; } if ((o->op_private & OPpTARGET_MY) && (PL_opargs[o->op_type] & OA_TARGLEX))/* OPp share the meaning */ { /* newASSIGNOP has already applied scalar context, which we leave, as if this op is inside SASSIGN. */ continue; } o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_VOID; switch (o->op_type) { default: if (!(PL_opargs[o->op_type] & OA_FOLDCONST)) break; /* FALLTHROUGH */ case OP_REPEAT: if (o->op_flags & OPf_STACKED) break; if (o->op_type == OP_REPEAT) scalar(cBINOPo->op_first); goto func_ops; case OP_SUBSTR: if (o->op_private == 4) break; /* FALLTHROUGH */ case OP_WANTARRAY: case OP_GV: case OP_SMARTMATCH: case OP_AV2ARYLEN: case OP_REF: case OP_REFGEN: case OP_SREFGEN: case OP_DEFINED: case OP_HEX: case OP_OCT: case OP_LENGTH: case OP_VEC: case OP_INDEX: case OP_RINDEX: case OP_SPRINTF: case OP_KVASLICE: case OP_KVHSLICE: case OP_UNPACK: case OP_PACK: case OP_JOIN: case OP_LSLICE: case OP_ANONLIST: case OP_ANONHASH: case OP_SORT: case OP_REVERSE: case OP_RANGE: case OP_FLIP: case OP_FLOP: case OP_CALLER: case OP_FILENO: case OP_EOF: case OP_TELL: case OP_GETSOCKNAME: case OP_GETPEERNAME: case OP_READLINK: case OP_TELLDIR: case OP_GETPPID: case OP_GETPGRP: case OP_GETPRIORITY: case OP_TIME: case OP_TMS: case OP_LOCALTIME: case OP_GMTIME: case OP_GHBYNAME: case OP_GHBYADDR: case OP_GHOSTENT: case OP_GNBYNAME: case OP_GNBYADDR: case OP_GNETENT: case OP_GPBYNAME: case OP_GPBYNUMBER: case OP_GPROTOENT: case OP_GSBYNAME: case OP_GSBYPORT: case OP_GSERVENT: case OP_GPWNAM: case OP_GPWUID: case OP_GGRNAM: case OP_GGRGID: case OP_GETLOGIN: case OP_PROTOTYPE: case OP_RUNCV: func_ops: useless = OP_DESC(o); break; case OP_GVSV: case OP_PADSV: case OP_PADAV: case OP_PADHV: case OP_PADANY: case OP_AELEM: case OP_AELEMFAST: case OP_AELEMFAST_LEX: case OP_ASLICE: case OP_HELEM: case OP_HSLICE: if (!(o->op_private & (OPpLVAL_INTRO|OPpOUR_INTRO))) /* Otherwise it's "Useless use of grep iterator" */ useless = OP_DESC(o); break; case OP_SPLIT: if (!(o->op_private & OPpSPLIT_ASSIGN)) useless = OP_DESC(o); break; case OP_NOT: kid = cUNOPo->op_first; if (kid->op_type != OP_MATCH && kid->op_type != OP_SUBST && kid->op_type != OP_TRANS && kid->op_type != OP_TRANSR) { goto func_ops; } useless = "negative pattern binding (!~)"; break; case OP_SUBST: if (cPMOPo->op_pmflags & PMf_NONDESTRUCT) useless = "non-destructive substitution (s///r)"; break; case OP_TRANSR: useless = "non-destructive transliteration (tr///r)"; break; case OP_RV2GV: case OP_RV2SV: case OP_RV2AV: case OP_RV2HV: if (!(o->op_private & (OPpLVAL_INTRO|OPpOUR_INTRO)) && (!OpHAS_SIBLING(o) || OpSIBLING(o)->op_type != OP_READLINE)) useless = "a variable"; break; case OP_CONST: sv = cSVOPo_sv; if (cSVOPo->op_private & OPpCONST_STRICT) no_bareword_allowed(o); else { if (ckWARN(WARN_VOID)) { NV nv; /* don't warn on optimised away booleans, eg * use constant Foo, 5; Foo || print; */ if (cSVOPo->op_private & OPpCONST_SHORTCIRCUIT) useless = NULL; /* the constants 0 and 1 are permitted as they are conventionally used as dummies in constructs like 1 while some_condition_with_side_effects; */ else if (SvNIOK(sv) && ((nv = SvNV(sv)) == 0.0 || nv == 1.0)) useless = NULL; else if (SvPOK(sv)) { SV * const dsv = newSVpvs(""); useless_sv = Perl_newSVpvf(aTHX_ "a constant (%s)", pv_pretty(dsv, SvPVX_const(sv), SvCUR(sv), 32, NULL, NULL, PERL_PV_PRETTY_DUMP | PERL_PV_ESCAPE_NOCLEAR | PERL_PV_ESCAPE_UNI_DETECT)); SvREFCNT_dec_NN(dsv); } else if (SvOK(sv)) { useless_sv = Perl_newSVpvf(aTHX_ "a constant (%" SVf ")", SVfARG(sv)); } else useless = "a constant (undef)"; } } op_null(o); /* don't execute or even remember it */ break; case OP_POSTINC: OpTYPE_set(o, OP_PREINC); /* pre-increment is faster */ break; case OP_POSTDEC: OpTYPE_set(o, OP_PREDEC); /* pre-decrement is faster */ break; case OP_I_POSTINC: OpTYPE_set(o, OP_I_PREINC); /* pre-increment is faster */ break; case OP_I_POSTDEC: OpTYPE_set(o, OP_I_PREDEC); /* pre-decrement is faster */ break; case OP_SASSIGN: { OP *rv2gv; UNOP *refgen, *rv2cv; LISTOP *exlist; if ((o->op_private & ~OPpASSIGN_BACKWARDS) != 2) break; rv2gv = ((BINOP *)o)->op_last; if (!rv2gv || rv2gv->op_type != OP_RV2GV) break; refgen = (UNOP *)((BINOP *)o)->op_first; if (!refgen || (refgen->op_type != OP_REFGEN && refgen->op_type != OP_SREFGEN)) break; exlist = (LISTOP *)refgen->op_first; if (!exlist || exlist->op_type != OP_NULL || exlist->op_targ != OP_LIST) break; if (exlist->op_first->op_type != OP_PUSHMARK && exlist->op_first != exlist->op_last) break; rv2cv = (UNOP*)exlist->op_last; if (rv2cv->op_type != OP_RV2CV) break; assert ((rv2gv->op_private & OPpDONT_INIT_GV) == 0); assert ((o->op_private & OPpASSIGN_CV_TO_GV) == 0); assert ((rv2cv->op_private & OPpMAY_RETURN_CONSTANT) == 0); o->op_private |= OPpASSIGN_CV_TO_GV; rv2gv->op_private |= OPpDONT_INIT_GV; rv2cv->op_private |= OPpMAY_RETURN_CONSTANT; break; } case OP_AASSIGN: { inplace_aassign(o); break; } case OP_OR: case OP_AND: kid = cLOGOPo->op_first; if (kid->op_type == OP_NOT && (kid->op_flags & OPf_KIDS)) { if (o->op_type == OP_AND) { OpTYPE_set(o, OP_OR); } else { OpTYPE_set(o, OP_AND); } op_null(kid); } /* FALLTHROUGH */ case OP_DOR: case OP_COND_EXPR: case OP_ENTERGIVEN: case OP_ENTERWHEN: for (kid = OpSIBLING(cUNOPo->op_first); kid; kid = OpSIBLING(kid)) if (!(kid->op_flags & OPf_KIDS)) scalarvoid(kid); else DEFER_OP(kid); break; case OP_NULL: if (o->op_flags & OPf_STACKED) break; /* FALLTHROUGH */ case OP_NEXTSTATE: case OP_DBSTATE: case OP_ENTERTRY: case OP_ENTER: if (!(o->op_flags & OPf_KIDS)) break; /* FALLTHROUGH */ case OP_SCOPE: case OP_LEAVE: case OP_LEAVETRY: case OP_LEAVELOOP: case OP_LINESEQ: case OP_LEAVEGIVEN: case OP_LEAVEWHEN: kids: for (kid = cLISTOPo->op_first; kid; kid = OpSIBLING(kid)) if (!(kid->op_flags & OPf_KIDS)) scalarvoid(kid); else DEFER_OP(kid); break; case OP_LIST: /* If the first kid after pushmark is something that the padrange optimisation would reject, then null the list and the pushmark. */ if ((kid = cLISTOPo->op_first)->op_type == OP_PUSHMARK && ( !(kid = OpSIBLING(kid)) || ( kid->op_type != OP_PADSV && kid->op_type != OP_PADAV && kid->op_type != OP_PADHV) || kid->op_private & ~OPpLVAL_INTRO || !(kid = OpSIBLING(kid)) || ( kid->op_type != OP_PADSV && kid->op_type != OP_PADAV && kid->op_type != OP_PADHV) || kid->op_private & ~OPpLVAL_INTRO) ) { op_null(cUNOPo->op_first); /* NULL the pushmark */ op_null(o); /* NULL the list */ } goto kids; case OP_ENTEREVAL: scalarkids(o); break; case OP_SCALAR: scalar(o); break; } if (useless_sv) { /* mortalise it, in case warnings are fatal. */ Perl_ck_warner(aTHX_ packWARN(WARN_VOID), "Useless use of %" SVf " in void context", SVfARG(sv_2mortal(useless_sv))); } else if (useless) { Perl_ck_warner(aTHX_ packWARN(WARN_VOID), "Useless use of %s in void context", useless); } } while ( (o = POP_DEFERRED_OP()) ); Safefree(defer_stack); return arg; } static OP * S_listkids(pTHX_ OP *o) { if (o && o->op_flags & OPf_KIDS) { OP *kid; for (kid = cLISTOPo->op_first; kid; kid = OpSIBLING(kid)) list(kid); } return o; } OP * Perl_list(pTHX_ OP *o) { OP *kid; /* assumes no premature commitment */ if (!o || (o->op_flags & OPf_WANT) || (PL_parser && PL_parser->error_count) || o->op_type == OP_RETURN) { return o; } if ((o->op_private & OPpTARGET_MY) && (PL_opargs[o->op_type] & OA_TARGLEX))/* OPp share the meaning */ { return o; /* As if inside SASSIGN */ } o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_LIST; switch (o->op_type) { case OP_FLOP: list(cBINOPo->op_first); break; case OP_REPEAT: if (o->op_private & OPpREPEAT_DOLIST && !(o->op_flags & OPf_STACKED)) { list(cBINOPo->op_first); kid = cBINOPo->op_last; if (kid->op_type == OP_CONST && SvIOK(kSVOP_sv) && SvIVX(kSVOP_sv) == 1) { op_null(o); /* repeat */ op_null(cUNOPx(cBINOPo->op_first)->op_first);/* pushmark */ /* const (rhs): */ op_free(op_sibling_splice(o, cBINOPo->op_first, 1, NULL)); } } break; case OP_OR: case OP_AND: case OP_COND_EXPR: for (kid = OpSIBLING(cUNOPo->op_first); kid; kid = OpSIBLING(kid)) list(kid); break; default: case OP_MATCH: case OP_QR: case OP_SUBST: case OP_NULL: if (!(o->op_flags & OPf_KIDS)) break; if (!o->op_next && cUNOPo->op_first->op_type == OP_FLOP) { list(cBINOPo->op_first); return gen_constant_list(o); } listkids(o); break; case OP_LIST: listkids(o); if (cLISTOPo->op_first->op_type == OP_PUSHMARK) { op_null(cUNOPo->op_first); /* NULL the pushmark */ op_null(o); /* NULL the list */ } break; case OP_LEAVE: case OP_LEAVETRY: kid = cLISTOPo->op_first; list(kid); kid = OpSIBLING(kid); do_kids: while (kid) { OP *sib = OpSIBLING(kid); if (sib && kid->op_type != OP_LEAVEWHEN) scalarvoid(kid); else list(kid); kid = sib; } PL_curcop = &PL_compiling; break; case OP_SCOPE: case OP_LINESEQ: kid = cLISTOPo->op_first; goto do_kids; } return o; } static OP * S_scalarseq(pTHX_ OP *o) { if (o) { const OPCODE type = o->op_type; if (type == OP_LINESEQ || type == OP_SCOPE || type == OP_LEAVE || type == OP_LEAVETRY) { OP *kid, *sib; for (kid = cLISTOPo->op_first; kid; kid = sib) { if ((sib = OpSIBLING(kid)) && ( OpHAS_SIBLING(sib) || sib->op_type != OP_NULL || ( sib->op_targ != OP_NEXTSTATE && sib->op_targ != OP_DBSTATE ))) { scalarvoid(kid); } } PL_curcop = &PL_compiling; } o->op_flags &= ~OPf_PARENS; if (PL_hints & HINT_BLOCK_SCOPE) o->op_flags |= OPf_PARENS; } else o = newOP(OP_STUB, 0); return o; } STATIC OP * S_modkids(pTHX_ OP *o, I32 type) { if (o && o->op_flags & OPf_KIDS) { OP *kid; for (kid = cLISTOPo->op_first; kid; kid = OpSIBLING(kid)) op_lvalue(kid, type); } return o; } /* for a helem/hslice/kvslice, if its a fixed hash, croak on invalid * const fields. Also, convert CONST keys to HEK-in-SVs. * rop is the op that retrieves the hash; * key_op is the first key */ STATIC void S_check_hash_fields_and_hekify(pTHX_ UNOP *rop, SVOP *key_op) { PADNAME *lexname; GV **fields; bool check_fields; /* find the padsv corresponding to $lex->{} or @{$lex}{} */ if (rop) { if (rop->op_first->op_type == OP_PADSV) /* @$hash{qw(keys here)} */ rop = (UNOP*)rop->op_first; else { /* @{$hash}{qw(keys here)} */ if (rop->op_first->op_type == OP_SCOPE && cLISTOPx(rop->op_first)->op_last->op_type == OP_PADSV) { rop = (UNOP*)cLISTOPx(rop->op_first)->op_last; } else rop = NULL; } } lexname = NULL; /* just to silence compiler warnings */ fields = NULL; /* just to silence compiler warnings */ check_fields = rop && (lexname = padnamelist_fetch(PL_comppad_name, rop->op_targ), SvPAD_TYPED(lexname)) && (fields = (GV**)hv_fetchs(PadnameTYPE(lexname), "FIELDS", FALSE)) && isGV(*fields) && GvHV(*fields); for (; key_op; key_op = (SVOP*)OpSIBLING(key_op)) { SV **svp, *sv; if (key_op->op_type != OP_CONST) continue; svp = cSVOPx_svp(key_op); /* make sure it's not a bareword under strict subs */ if (key_op->op_private & OPpCONST_BARE && key_op->op_private & OPpCONST_STRICT) { no_bareword_allowed((OP*)key_op); } /* Make the CONST have a shared SV */ if ( !SvIsCOW_shared_hash(sv = *svp) && SvTYPE(sv) < SVt_PVMG && SvOK(sv) && !SvROK(sv)) { SSize_t keylen; const char * const key = SvPV_const(sv, *(STRLEN*)&keylen); SV *nsv = newSVpvn_share(key, SvUTF8(sv) ? -keylen : keylen, 0); SvREFCNT_dec_NN(sv); *svp = nsv; } if ( check_fields && !hv_fetch_ent(GvHV(*fields), *svp, FALSE, 0)) { Perl_croak(aTHX_ "No such class field \"%" SVf "\" " "in variable %" PNf " of type %" HEKf, SVfARG(*svp), PNfARG(lexname), HEKfARG(HvNAME_HEK(PadnameTYPE(lexname)))); } } } /* info returned by S_sprintf_is_multiconcatable() */ struct sprintf_ismc_info { SSize_t nargs; /* num of args to sprintf (not including the format) */ char *start; /* start of raw format string */ char *end; /* bytes after end of raw format string */ STRLEN total_len; /* total length (in bytes) of format string, not including '%s' and half of '%%' */ STRLEN variant; /* number of bytes by which total_len_p would grow if upgraded to utf8 */ bool utf8; /* whether the format is utf8 */ }; /* is the OP_SPRINTF o suitable for converting into a multiconcat op? * i.e. its format argument is a const string with only '%s' and '%%' * formats, and the number of args is known, e.g. * sprintf "a=%s f=%s", $a[0], scalar(f()); * but not * sprintf "i=%d a=%s f=%s", $i, @a, f(); * * If successful, the sprintf_ismc_info struct pointed to by info will be * populated. */ STATIC bool S_sprintf_is_multiconcatable(pTHX_ OP *o,struct sprintf_ismc_info *info) { OP *pm, *constop, *kid; SV *sv; char *s, *e, *p; SSize_t nargs, nformats; STRLEN cur, total_len, variant; bool utf8; /* if sprintf's behaviour changes, die here so that someone * can decide whether to enhance this function or skip optimising * under those new circumstances */ assert(!(o->op_flags & OPf_STACKED)); assert(!(PL_opargs[OP_SPRINTF] & OA_TARGLEX)); assert(!(o->op_private & ~OPpARG4_MASK)); pm = cUNOPo->op_first; if (pm->op_type != OP_PUSHMARK) /* weird coreargs stuff */ return FALSE; constop = OpSIBLING(pm); if (!constop || constop->op_type != OP_CONST) return FALSE; sv = cSVOPx_sv(constop); if (SvMAGICAL(sv) || !SvPOK(sv)) return FALSE; s = SvPV(sv, cur); e = s + cur; /* Scan format for %% and %s and work out how many %s there are. * Abandon if other format types are found. */ nformats = 0; total_len = 0; variant = 0; for (p = s; p < e; p++) { if (*p != '%') { total_len++; if (!UTF8_IS_INVARIANT(*p)) variant++; continue; } p++; if (p >= e) return FALSE; /* lone % at end gives "Invalid conversion" */ if (*p == '%') total_len++; else if (*p == 's') nformats++; else return FALSE; } if (!nformats || nformats > PERL_MULTICONCAT_MAXARG) return FALSE; utf8 = cBOOL(SvUTF8(sv)); if (utf8) variant = 0; /* scan args; they must all be in scalar cxt */ nargs = 0; kid = OpSIBLING(constop); while (kid) { if ((kid->op_flags & OPf_WANT) != OPf_WANT_SCALAR) return FALSE; nargs++; kid = OpSIBLING(kid); } if (nargs != nformats) return FALSE; /* e.g. sprintf("%s%s", $a); */ info->nargs = nargs; info->start = s; info->end = e; info->total_len = total_len; info->variant = variant; info->utf8 = utf8; return TRUE; } /* S_maybe_multiconcat(): * * given an OP_STRINGIFY, OP_SASSIGN, OP_CONCAT or OP_SPRINTF op, possibly * convert it (and its children) into an OP_MULTICONCAT. See the code * comments just before pp_multiconcat() for the full details of what * OP_MULTICONCAT supports. * * Basically we're looking for an optree with a chain of OP_CONCATS down * the LHS (or an OP_SPRINTF), with possibly an OP_SASSIGN, and/or * OP_STRINGIFY, and/or OP_CONCAT acting as '.=' at its head, e.g. * * $x = "$a$b-$c" * * looks like * * SASSIGN * | * STRINGIFY -- PADSV[$x] * | * | * ex-PUSHMARK -- CONCAT/S * | * CONCAT/S -- PADSV[$d] * | * CONCAT -- CONST["-"] * | * PADSV[$a] -- PADSV[$b] * * Note that at this stage the OP_SASSIGN may have already been optimised * away with OPpTARGET_MY set on the OP_STRINGIFY or OP_CONCAT. */ STATIC void S_maybe_multiconcat(pTHX_ OP *o) { OP *lastkidop; /* the right-most of any kids unshifted onto o */ OP *topop; /* the top-most op in the concat tree (often equals o, unless there are assign/stringify ops above it */ OP *parentop; /* the parent op of topop (or itself if no parent) */ OP *targmyop; /* the op (if any) with the OPpTARGET_MY flag */ OP *targetop; /* the op corresponding to target=... or target.=... */ OP *stringop; /* the OP_STRINGIFY op, if any */ OP *nextop; /* used for recreating the op_next chain without consts */ OP *kid; /* general-purpose op pointer */ UNOP_AUX_item *aux; UNOP_AUX_item *lenp; char *const_str, *p; struct sprintf_ismc_info sprintf_info; /* store info about each arg in args[]; * toparg is the highest used slot; argp is a general * pointer to args[] slots */ struct { void *p; /* initially points to const sv (or null for op); later, set to SvPV(constsv), with ... */ STRLEN len; /* ... len set to SvPV(..., len) */ } *argp, *toparg, args[PERL_MULTICONCAT_MAXARG*2 + 1]; SSize_t nargs = 0; SSize_t nconst = 0; STRLEN variant; bool utf8 = FALSE; bool kid_is_last = FALSE; /* most args will be the RHS kid of a concat op; the last-processed arg will the LHS of one, as args are processed in reverse order */ U8 stacked_last = 0; /* whether the last seen concat op was STACKED */ STRLEN total_len = 0; /* sum of the lengths of the const segments */ U8 flags = 0; /* what will become the op_flags and ... */ U8 private_flags = 0; /* ... op_private of the multiconcat op */ bool is_sprintf = FALSE; /* we're optimising an sprintf */ bool is_targable = FALSE; /* targetop is an OPpTARGET_MY candidate */ /* ----------------------------------------------------------------- * Phase 1: * * Examine the optree non-destructively to determine whether it's * suitable to be converted into an OP_MULTICONCAT. Accumulate * information about the optree in args[]. */ argp = args; targmyop = NULL; targetop = NULL; stringop = NULL; topop = o; parentop = o; assert( o->op_type == OP_SASSIGN || o->op_type == OP_CONCAT || o->op_type == OP_SPRINTF || o->op_type == OP_STRINGIFY); /* first see if, at the top of the tree, there is an assign, * append and/or stringify */ if (topop->op_type == OP_SASSIGN) { /* expr = ..... */ if (o->op_ppaddr != PL_ppaddr[OP_SASSIGN]) return; if (o->op_private & (OPpASSIGN_BACKWARDS|OPpASSIGN_CV_TO_GV)) return; assert(!(o->op_private & ~OPpARG2_MASK)); /* barf on unknown flags */ parentop = topop; topop = cBINOPo->op_first; targetop = OpSIBLING(topop); if (!targetop) /* probably some sort of syntax error */ return; } else if ( topop->op_type == OP_CONCAT && (topop->op_flags & OPf_STACKED) && (cUNOPo->op_first->op_flags & OPf_MOD)) { /* expr .= ..... */ /* OPpTARGET_MY shouldn't be able to be set here. If it is, * decide what to do about it */ assert(!(o->op_private & OPpTARGET_MY)); /* barf on unknown flags */ assert(!(o->op_private & ~(OPpARG2_MASK|OPpTARGET_MY))); private_flags |= OPpMULTICONCAT_APPEND; targetop = cBINOPo->op_first; parentop = topop; topop = OpSIBLING(targetop); /* $x .= gets optimised to rcatline instead */ if (topop->op_type == OP_READLINE) return; } if (targetop) { /* Can targetop (the LHS) if it's a padsv, be be optimised * away and use OPpTARGET_MY instead? */ if ( (targetop->op_type == OP_PADSV) && !(targetop->op_private & OPpDEREF) && !(targetop->op_private & OPpPAD_STATE) /* we don't support 'my $x .= ...' */ && ( o->op_type == OP_SASSIGN || !(targetop->op_private & OPpLVAL_INTRO)) ) is_targable = TRUE; } if (topop->op_type == OP_STRINGIFY) { if (topop->op_ppaddr != PL_ppaddr[OP_STRINGIFY]) return; stringop = topop; /* barf on unknown flags */ assert(!(o->op_private & ~(OPpARG4_MASK|OPpTARGET_MY))); if ((topop->op_private & OPpTARGET_MY)) { if (o->op_type == OP_SASSIGN) return; /* can't have two assigns */ targmyop = topop; } private_flags |= OPpMULTICONCAT_STRINGIFY; parentop = topop; topop = cBINOPx(topop)->op_first; assert(OP_TYPE_IS_OR_WAS_NN(topop, OP_PUSHMARK)); topop = OpSIBLING(topop); } if (topop->op_type == OP_SPRINTF) { if (topop->op_ppaddr != PL_ppaddr[OP_SPRINTF]) return; if (S_sprintf_is_multiconcatable(aTHX_ topop, &sprintf_info)) { nargs = sprintf_info.nargs; total_len = sprintf_info.total_len; variant = sprintf_info.variant; utf8 = sprintf_info.utf8; is_sprintf = TRUE; private_flags |= OPpMULTICONCAT_FAKE; toparg = argp; /* we have an sprintf op rather than a concat optree. * Skip most of the code below which is associated with * processing that optree. We also skip phase 2, determining * whether its cost effective to optimise, since for sprintf, * multiconcat is *always* faster */ goto create_aux; } /* note that even if the sprintf itself isn't multiconcatable, * the expression as a whole may be, e.g. in * $x .= sprintf("%d",...) * the sprintf op will be left as-is, but the concat/S op may * be upgraded to multiconcat */ } else if (topop->op_type == OP_CONCAT) { if (topop->op_ppaddr != PL_ppaddr[OP_CONCAT]) return; if ((topop->op_private & OPpTARGET_MY)) { if (o->op_type == OP_SASSIGN || targmyop) return; /* can't have two assigns */ targmyop = topop; } } /* Is it safe to convert a sassign/stringify/concat op into * a multiconcat? */ assert((PL_opargs[OP_SASSIGN] & OA_CLASS_MASK) == OA_BINOP); assert((PL_opargs[OP_CONCAT] & OA_CLASS_MASK) == OA_BINOP); assert((PL_opargs[OP_STRINGIFY] & OA_CLASS_MASK) == OA_LISTOP); assert((PL_opargs[OP_SPRINTF] & OA_CLASS_MASK) == OA_LISTOP); STATIC_ASSERT_STMT( STRUCT_OFFSET(BINOP, op_last) == STRUCT_OFFSET(UNOP_AUX, op_aux)); STATIC_ASSERT_STMT( STRUCT_OFFSET(LISTOP, op_last) == STRUCT_OFFSET(UNOP_AUX, op_aux)); /* Now scan the down the tree looking for a series of * CONCAT/OPf_STACKED ops on the LHS (with the last one not * stacked). For example this tree: * * | * CONCAT/STACKED * | * CONCAT/STACKED -- EXPR5 * | * CONCAT/STACKED -- EXPR4 * | * CONCAT -- EXPR3 * | * EXPR1 -- EXPR2 * * corresponds to an expression like * * (EXPR1 . EXPR2 . EXPR3 . EXPR4 . EXPR5) * * Record info about each EXPR in args[]: in particular, whether it is * a stringifiable OP_CONST and if so what the const sv is. * * The reason why the last concat can't be STACKED is the difference * between * * ((($a .= $a) .= $a) .= $a) .= $a * * and * $a . $a . $a . $a . $a * * The main difference between the optrees for those two constructs * is the presence of the last STACKED. As well as modifying $a, * the former sees the changed $a between each concat, so if $s is * initially 'a', the first returns 'a' x 16, while the latter returns * 'a' x 5. And pp_multiconcat can't handle that kind of thing. */ kid = topop; for (;;) { OP *argop; SV *sv; bool last = FALSE; if ( kid->op_type == OP_CONCAT && !kid_is_last ) { OP *k1, *k2; k1 = cUNOPx(kid)->op_first; k2 = OpSIBLING(k1); /* shouldn't happen except maybe after compile err? */ if (!k2) return; /* avoid turning (A . B . ($lex = C) ...) into (A . B . C ...) */ if (kid->op_private & OPpTARGET_MY) kid_is_last = TRUE; stacked_last = (kid->op_flags & OPf_STACKED); if (!stacked_last) kid_is_last = TRUE; kid = k1; argop = k2; } else { argop = kid; last = TRUE; } if ( nargs > PERL_MULTICONCAT_MAXARG - 2 || (argp - args + 1) > (PERL_MULTICONCAT_MAXARG*2 + 1) - 2) { /* At least two spare slots are needed to decompose both * concat args. If there are no slots left, continue to * examine the rest of the optree, but don't push new values * on args[]. If the optree as a whole is legal for conversion * (in particular that the last concat isn't STACKED), then * the first PERL_MULTICONCAT_MAXARG elements of the optree * can be converted into an OP_MULTICONCAT now, with the first * child of that op being the remainder of the optree - * which may itself later be converted to a multiconcat op * too. */ if (last) { /* the last arg is the rest of the optree */ argp++->p = NULL; nargs++; } } else if ( argop->op_type == OP_CONST && ((sv = cSVOPx_sv(argop))) /* defer stringification until runtime of 'constant' * things that might stringify variantly, e.g. the radix * point of NVs, or overloaded RVs */ && (SvPOK(sv) || SvIOK(sv)) && (!SvGMAGICAL(sv)) ) { argp++->p = sv; utf8 |= cBOOL(SvUTF8(sv)); nconst++; } else { argp++->p = NULL; nargs++; } if (last) break; } toparg = argp - 1; if (stacked_last) return; /* we don't support ((A.=B).=C)...) */ /* ----------------------------------------------------------------- * Phase 2: * * At this point we have determined that the optree *can* be converted * into a multiconcat. Having gathered all the evidence, we now decide * whether it *should*. */ /* we need at least one concat action, e.g.: * * Y . Z * X = Y . Z * X .= Y * * otherwise we could be doing something like $x = "foo", which * if treated as as a concat, would fail to COW. */ if (nargs + nconst + cBOOL(private_flags & OPpMULTICONCAT_APPEND) < 2) return; /* Benchmarking seems to indicate that we gain if: * * we optimise at least two actions into a single multiconcat * (e.g concat+concat, sassign+concat); * * or if we can eliminate at least 1 OP_CONST; * * or if we can eliminate a padsv via OPpTARGET_MY */ if ( /* eliminated at least one OP_CONST */ nconst >= 1 /* eliminated an OP_SASSIGN */ || o->op_type == OP_SASSIGN /* eliminated an OP_PADSV */ || (!targmyop && is_targable) ) /* definitely a net gain to optimise */ goto optimise; /* ... if not, what else? */ /* special-case '$lex1 = expr . $lex1' (where expr isn't lex1): * multiconcat is faster (due to not creating a temporary copy of * $lex1), whereas for a general $lex1 = $lex2 . $lex3, concat is * faster. */ if ( nconst == 0 && nargs == 2 && targmyop && topop->op_type == OP_CONCAT ) { PADOFFSET t = targmyop->op_targ; OP *k1 = cBINOPx(topop)->op_first; OP *k2 = cBINOPx(topop)->op_last; if ( k2->op_type == OP_PADSV && k2->op_targ == t && ( k1->op_type != OP_PADSV || k1->op_targ != t) ) goto optimise; } /* need at least two concats */ if (nargs + nconst + cBOOL(private_flags & OPpMULTICONCAT_APPEND) < 3) return; /* ----------------------------------------------------------------- * Phase 3: * * At this point the optree has been verified as ok to be optimised * into an OP_MULTICONCAT. Now start changing things. */ optimise: /* stringify all const args and determine utf8ness */ variant = 0; for (argp = args; argp <= toparg; argp++) { SV *sv = (SV*)argp->p; if (!sv) continue; /* not a const op */ if (utf8 && !SvUTF8(sv)) sv_utf8_upgrade_nomg(sv); argp->p = SvPV_nomg(sv, argp->len); total_len += argp->len; /* see if any strings would grow if converted to utf8 */ if (!utf8) { char *p = (char*)argp->p; STRLEN len = argp->len; while (len--) { U8 c = *p++; if (!UTF8_IS_INVARIANT(c)) variant++; } } } /* create and populate aux struct */ create_aux: aux = (UNOP_AUX_item*)PerlMemShared_malloc( sizeof(UNOP_AUX_item) * ( PERL_MULTICONCAT_HEADER_SIZE + ((nargs + 1) * (variant ? 2 : 1)) ) ); const_str = (char *)PerlMemShared_malloc(total_len ? total_len : 1); /* Extract all the non-const expressions from the concat tree then * dispose of the old tree, e.g. convert the tree from this: * * o => SASSIGN * | * STRINGIFY -- TARGET * | * ex-PUSHMARK -- CONCAT * | * CONCAT -- EXPR5 * | * CONCAT -- EXPR4 * | * CONCAT -- EXPR3 * | * EXPR1 -- EXPR2 * * * to: * * o => MULTICONCAT * | * ex-PUSHMARK -- EXPR1 -- EXPR2 -- EXPR3 -- EXPR4 -- EXPR5 -- TARGET * * except that if EXPRi is an OP_CONST, it's discarded. * * During the conversion process, EXPR ops are stripped from the tree * and unshifted onto o. Finally, any of o's remaining original * childen are discarded and o is converted into an OP_MULTICONCAT. * * In this middle of this, o may contain both: unshifted args on the * left, and some remaining original args on the right. lastkidop * is set to point to the right-most unshifted arg to delineate * between the two sets. */ if (is_sprintf) { /* create a copy of the format with the %'s removed, and record * the sizes of the const string segments in the aux struct */ char *q, *oldq; lenp = aux + PERL_MULTICONCAT_IX_LENGTHS; p = sprintf_info.start; q = const_str; oldq = q; for (; p < sprintf_info.end; p++) { if (*p == '%') { p++; if (*p != '%') { (lenp++)->ssize = q - oldq; oldq = q; continue; } } *q++ = *p; } lenp->ssize = q - oldq; assert((STRLEN)(q - const_str) == total_len); /* Attach all the args (i.e. the kids of the sprintf) to o (which * may or may not be topop) The pushmark and const ops need to be * kept in case they're an op_next entry point. */ lastkidop = cLISTOPx(topop)->op_last; kid = cUNOPx(topop)->op_first; /* pushmark */ op_null(kid); op_null(OpSIBLING(kid)); /* const */ if (o != topop) { kid = op_sibling_splice(topop, NULL, -1, NULL); /* cut all args */ op_sibling_splice(o, NULL, 0, kid); /* and attach to o */ lastkidop->op_next = o; } } else { p = const_str; lenp = aux + PERL_MULTICONCAT_IX_LENGTHS; lenp->ssize = -1; /* Concatenate all const strings into const_str. * Note that args[] contains the RHS args in reverse order, so * we scan args[] from top to bottom to get constant strings * in L-R order */ for (argp = toparg; argp >= args; argp--) { if (!argp->p) /* not a const op */ (++lenp)->ssize = -1; else { STRLEN l = argp->len; Copy(argp->p, p, l, char); p += l; if (lenp->ssize == -1) lenp->ssize = l; else lenp->ssize += l; } } kid = topop; nextop = o; lastkidop = NULL; for (argp = args; argp <= toparg; argp++) { /* only keep non-const args, except keep the first-in-next-chain * arg no matter what it is (but nulled if OP_CONST), because it * may be the entry point to this subtree from the previous * op_next. */ bool last = (argp == toparg); OP *prev; /* set prev to the sibling *before* the arg to be cut out, * e.g.: * * | * kid= CONST * | * prev= CONST -- EXPR * | */ if (argp == args && kid->op_type != OP_CONCAT) { /* in e.g. '$x . = f(1)' there's no RHS concat tree * so the expression to be cut isn't kid->op_last but * kid itself */ OP *o1, *o2; /* find the op before kid */ o1 = NULL; o2 = cUNOPx(parentop)->op_first; while (o2 && o2 != kid) { o1 = o2; o2 = OpSIBLING(o2); } assert(o2 == kid); prev = o1; kid = parentop; } else if (kid == o && lastkidop) prev = last ? lastkidop : OpSIBLING(lastkidop); else prev = last ? NULL : cUNOPx(kid)->op_first; if (!argp->p || last) { /* cut RH op */ OP *aop = op_sibling_splice(kid, prev, 1, NULL); /* and unshift to front of o */ op_sibling_splice(o, NULL, 0, aop); /* record the right-most op added to o: later we will * free anything to the right of it */ if (!lastkidop) lastkidop = aop; aop->op_next = nextop; if (last) { if (argp->p) /* null the const at start of op_next chain */ op_null(aop); } else if (prev) nextop = prev->op_next; } /* the last two arguments are both attached to the same concat op */ if (argp < toparg - 1) kid = prev; } } /* Populate the aux struct */ aux[PERL_MULTICONCAT_IX_NARGS].ssize = nargs; aux[PERL_MULTICONCAT_IX_PLAIN_PV].pv = utf8 ? NULL : const_str; aux[PERL_MULTICONCAT_IX_PLAIN_LEN].ssize = utf8 ? 0 : total_len; aux[PERL_MULTICONCAT_IX_UTF8_PV].pv = const_str; aux[PERL_MULTICONCAT_IX_UTF8_LEN].ssize = total_len; /* if variant > 0, calculate a variant const string and lengths where * the utf8 version of the string will take 'variant' more bytes than * the plain one. */ if (variant) { char *p = const_str; STRLEN ulen = total_len + variant; UNOP_AUX_item *lens = aux + PERL_MULTICONCAT_IX_LENGTHS; UNOP_AUX_item *ulens = lens + (nargs + 1); char *up = (char*)PerlMemShared_malloc(ulen); SSize_t n; aux[PERL_MULTICONCAT_IX_UTF8_PV].pv = up; aux[PERL_MULTICONCAT_IX_UTF8_LEN].ssize = ulen; for (n = 0; n < (nargs + 1); n++) { SSize_t i; char * orig_up = up; for (i = (lens++)->ssize; i > 0; i--) { U8 c = *p++; append_utf8_from_native_byte(c, (U8**)&up); } (ulens++)->ssize = (i < 0) ? i : up - orig_up; } } if (stringop) { /* if there was a top(ish)-level OP_STRINGIFY, we need to keep * that op's first child - an ex-PUSHMARK - because the op_next of * the previous op may point to it (i.e. it's the entry point for * the o optree) */ OP *pmop = (stringop == o) ? op_sibling_splice(o, lastkidop, 1, NULL) : op_sibling_splice(stringop, NULL, 1, NULL); assert(OP_TYPE_IS_OR_WAS_NN(pmop, OP_PUSHMARK)); op_sibling_splice(o, NULL, 0, pmop); if (!lastkidop) lastkidop = pmop; } /* Optimise * target = A.B.C... * target .= A.B.C... */ if (targetop) { assert(!targmyop); if (o->op_type == OP_SASSIGN) { /* Move the target subtree from being the last of o's children * to being the last of o's preserved children. * Note the difference between 'target = ...' and 'target .= ...': * for the former, target is executed last; for the latter, * first. */ kid = OpSIBLING(lastkidop); op_sibling_splice(o, kid, 1, NULL); /* cut target op */ op_sibling_splice(o, lastkidop, 0, targetop); /* and paste */ lastkidop->op_next = kid->op_next; lastkidop = targetop; } else { /* Move the target subtree from being the first of o's * original children to being the first of *all* o's children. */ if (lastkidop) { op_sibling_splice(o, lastkidop, 1, NULL); /* cut target op */ op_sibling_splice(o, NULL, 0, targetop); /* and paste*/ } else { /* if the RHS of .= doesn't contain a concat (e.g. * $x .= "foo"), it gets missed by the "strip ops from the * tree and add to o" loop earlier */ assert(topop->op_type != OP_CONCAT); if (stringop) { /* in e.g. $x .= "$y", move the $y expression * from being a child of OP_STRINGIFY to being the * second child of the OP_CONCAT */ assert(cUNOPx(stringop)->op_first == topop); op_sibling_splice(stringop, NULL, 1, NULL); op_sibling_splice(o, cUNOPo->op_first, 0, topop); } assert(topop == OpSIBLING(cBINOPo->op_first)); if (toparg->p) op_null(topop); lastkidop = topop; } } if (is_targable) { /* optimise * my $lex = A.B.C... * $lex = A.B.C... * $lex .= A.B.C... * The original padsv op is kept but nulled in case it's the * entry point for the optree (which it will be for * '$lex .= ... ' */ private_flags |= OPpTARGET_MY; private_flags |= (targetop->op_private & OPpLVAL_INTRO); o->op_targ = targetop->op_targ; targetop->op_targ = 0; op_null(targetop); } else flags |= OPf_STACKED; } else if (targmyop) { private_flags |= OPpTARGET_MY; if (o != targmyop) { o->op_targ = targmyop->op_targ; targmyop->op_targ = 0; } } /* detach the emaciated husk of the sprintf/concat optree and free it */ for (;;) { kid = op_sibling_splice(o, lastkidop, 1, NULL); if (!kid) break; op_free(kid); } /* and convert o into a multiconcat */ o->op_flags = (flags|OPf_KIDS|stacked_last |(o->op_flags & (OPf_WANT|OPf_PARENS))); o->op_private = private_flags; o->op_type = OP_MULTICONCAT; o->op_ppaddr = PL_ppaddr[OP_MULTICONCAT]; cUNOP_AUXo->op_aux = aux; } /* do all the final processing on an optree (e.g. running the peephole * optimiser on it), then attach it to cv (if cv is non-null) */ static void S_process_optree(pTHX_ CV *cv, OP *optree, OP* start) { OP **startp; /* XXX for some reason, evals, require and main optrees are * never attached to their CV; instead they just hang off * PL_main_root + PL_main_start or PL_eval_root + PL_eval_start * and get manually freed when appropriate */ if (cv) startp = &CvSTART(cv); else startp = PL_in_eval? &PL_eval_start : &PL_main_start; *startp = start; optree->op_private |= OPpREFCOUNTED; OpREFCNT_set(optree, 1); optimize_optree(optree); CALL_PEEP(*startp); finalize_optree(optree); S_prune_chain_head(startp); if (cv) { /* now that optimizer has done its work, adjust pad values */ pad_tidy(optree->op_type == OP_LEAVEWRITE ? padtidy_FORMAT : CvCLONE(cv) ? padtidy_SUBCLONE : padtidy_SUB); } } /* =for apidoc optimize_optree This function applies some optimisations to the optree in top-down order. It is called before the peephole optimizer, which processes ops in execution order. Note that finalize_optree() also does a top-down scan, but is called *after* the peephole optimizer. =cut */ void Perl_optimize_optree(pTHX_ OP* o) { PERL_ARGS_ASSERT_OPTIMIZE_OPTREE; ENTER; SAVEVPTR(PL_curcop); optimize_op(o); LEAVE; } /* helper for optimize_optree() which optimises on op then recurses * to optimise any children. */ STATIC void S_optimize_op(pTHX_ OP* o) { OP *kid; PERL_ARGS_ASSERT_OPTIMIZE_OP; assert(o->op_type != OP_FREED); switch (o->op_type) { case OP_NEXTSTATE: case OP_DBSTATE: PL_curcop = ((COP*)o); /* for warnings */ break; case OP_CONCAT: case OP_SASSIGN: case OP_STRINGIFY: case OP_SPRINTF: S_maybe_multiconcat(aTHX_ o); break; case OP_SUBST: if (cPMOPo->op_pmreplrootu.op_pmreplroot) optimize_op(cPMOPo->op_pmreplrootu.op_pmreplroot); break; default: break; } if (!(o->op_flags & OPf_KIDS)) return; for (kid = cUNOPo->op_first; kid; kid = OpSIBLING(kid)) optimize_op(kid); } /* =for apidoc finalize_optree This function finalizes the optree. Should be called directly after the complete optree is built. It does some additional checking which can't be done in the normal Cxxx functions and makes the tree thread-safe. =cut */ void Perl_finalize_optree(pTHX_ OP* o) { PERL_ARGS_ASSERT_FINALIZE_OPTREE; ENTER; SAVEVPTR(PL_curcop); finalize_op(o); LEAVE; } #ifdef USE_ITHREADS /* Relocate sv to the pad for thread safety. * Despite being a "constant", the SV is written to, * for reference counts, sv_upgrade() etc. */ PERL_STATIC_INLINE void S_op_relocate_sv(pTHX_ SV** svp, PADOFFSET* targp) { PADOFFSET ix; PERL_ARGS_ASSERT_OP_RELOCATE_SV; if (!*svp) return; ix = pad_alloc(OP_CONST, SVf_READONLY); SvREFCNT_dec(PAD_SVl(ix)); PAD_SETSV(ix, *svp); /* XXX I don't know how this isn't readonly already. */ if (!SvIsCOW(PAD_SVl(ix))) SvREADONLY_on(PAD_SVl(ix)); *svp = NULL; *targp = ix; } #endif STATIC void S_finalize_op(pTHX_ OP* o) { PERL_ARGS_ASSERT_FINALIZE_OP; assert(o->op_type != OP_FREED); switch (o->op_type) { case OP_NEXTSTATE: case OP_DBSTATE: PL_curcop = ((COP*)o); /* for warnings */ break; case OP_EXEC: if (OpHAS_SIBLING(o)) { OP *sib = OpSIBLING(o); if (( sib->op_type == OP_NEXTSTATE || sib->op_type == OP_DBSTATE) && ckWARN(WARN_EXEC) && OpHAS_SIBLING(sib)) { const OPCODE type = OpSIBLING(sib)->op_type; if (type != OP_EXIT && type != OP_WARN && type != OP_DIE) { const line_t oldline = CopLINE(PL_curcop); CopLINE_set(PL_curcop, CopLINE((COP*)sib)); Perl_warner(aTHX_ packWARN(WARN_EXEC), "Statement unlikely to be reached"); Perl_warner(aTHX_ packWARN(WARN_EXEC), "\t(Maybe you meant system() when you said exec()?)\n"); CopLINE_set(PL_curcop, oldline); } } } break; case OP_GV: if ((o->op_private & OPpEARLY_CV) && ckWARN(WARN_PROTOTYPE)) { GV * const gv = cGVOPo_gv; if (SvTYPE(gv) == SVt_PVGV && GvCV(gv) && SvPVX_const(GvCV(gv))) { /* XXX could check prototype here instead of just carping */ SV * const sv = sv_newmortal(); gv_efullname3(sv, gv, NULL); Perl_warner(aTHX_ packWARN(WARN_PROTOTYPE), "%" SVf "() called too early to check prototype", SVfARG(sv)); } } break; case OP_CONST: if (cSVOPo->op_private & OPpCONST_STRICT) no_bareword_allowed(o); #ifdef USE_ITHREADS /* FALLTHROUGH */ case OP_HINTSEVAL: op_relocate_sv(&cSVOPo->op_sv, &o->op_targ); #endif break; #ifdef USE_ITHREADS /* Relocate all the METHOP's SVs to the pad for thread safety. */ case OP_METHOD_NAMED: case OP_METHOD_SUPER: case OP_METHOD_REDIR: case OP_METHOD_REDIR_SUPER: op_relocate_sv(&cMETHOPx(o)->op_u.op_meth_sv, &o->op_targ); break; #endif case OP_HELEM: { UNOP *rop; SVOP *key_op; OP *kid; if ((key_op = cSVOPx(((BINOP*)o)->op_last))->op_type != OP_CONST) break; rop = (UNOP*)((BINOP*)o)->op_first; goto check_keys; case OP_HSLICE: S_scalar_slice_warning(aTHX_ o); /* FALLTHROUGH */ case OP_KVHSLICE: kid = OpSIBLING(cLISTOPo->op_first); if (/* I bet there's always a pushmark... */ OP_TYPE_ISNT_AND_WASNT_NN(kid, OP_LIST) && OP_TYPE_ISNT_NN(kid, OP_CONST)) { break; } key_op = (SVOP*)(kid->op_type == OP_CONST ? kid : OpSIBLING(kLISTOP->op_first)); rop = (UNOP*)((LISTOP*)o)->op_last; check_keys: if (o->op_private & OPpLVAL_INTRO || rop->op_type != OP_RV2HV) rop = NULL; S_check_hash_fields_and_hekify(aTHX_ rop, key_op); break; } case OP_NULL: if (o->op_targ != OP_HSLICE && o->op_targ != OP_ASLICE) break; /* FALLTHROUGH */ case OP_ASLICE: S_scalar_slice_warning(aTHX_ o); break; case OP_SUBST: { if (cPMOPo->op_pmreplrootu.op_pmreplroot) finalize_op(cPMOPo->op_pmreplrootu.op_pmreplroot); break; } default: break; } if (o->op_flags & OPf_KIDS) { OP *kid; #ifdef DEBUGGING /* check that op_last points to the last sibling, and that * the last op_sibling/op_sibparent field points back to the * parent, and that the only ops with KIDS are those which are * entitled to them */ U32 type = o->op_type; U32 family; bool has_last; if (type == OP_NULL) { type = o->op_targ; /* ck_glob creates a null UNOP with ex-type GLOB * (which is a list op. So pretend it wasn't a listop */ if (type == OP_GLOB) type = OP_NULL; } family = PL_opargs[type] & OA_CLASS_MASK; has_last = ( family == OA_BINOP || family == OA_LISTOP || family == OA_PMOP || family == OA_LOOP ); assert( has_last /* has op_first and op_last, or ... ... has (or may have) op_first: */ || family == OA_UNOP || family == OA_UNOP_AUX || family == OA_LOGOP || family == OA_BASEOP_OR_UNOP || family == OA_FILESTATOP || family == OA_LOOPEXOP || family == OA_METHOP || type == OP_CUSTOM || type == OP_NULL /* new_logop does this */ ); for (kid = cUNOPo->op_first; kid; kid = OpSIBLING(kid)) { # ifdef PERL_OP_PARENT if (!OpHAS_SIBLING(kid)) { if (has_last) assert(kid == cLISTOPo->op_last); assert(kid->op_sibparent == o); } # else if (has_last && !OpHAS_SIBLING(kid)) assert(kid == cLISTOPo->op_last); # endif } #endif for (kid = cUNOPo->op_first; kid; kid = OpSIBLING(kid)) finalize_op(kid); } } /* =for apidoc Amx|OP *|op_lvalue|OP *o|I32 type Propagate lvalue ("modifiable") context to an op and its children. C represents the context type, roughly based on the type of op that would do the modifying, although C is represented by C, because it has no op type of its own (it is signalled by a flag on the lvalue op). This function detects things that can't be modified, such as C<$x+1>, and generates errors for them. For example, C<$x+1 = 2> would cause it to be called with an op of type C and a C argument of C. It also flags things that need to behave specially in an lvalue context, such as C<$$x = 5> which might have to vivify a reference in C<$x>. =cut */ static void S_mark_padname_lvalue(pTHX_ PADNAME *pn) { CV *cv = PL_compcv; PadnameLVALUE_on(pn); while (PadnameOUTER(pn) && PARENT_PAD_INDEX(pn)) { cv = CvOUTSIDE(cv); /* RT #127786: cv can be NULL due to an eval within the DB package * called from an anon sub - anon subs don't have CvOUTSIDE() set * unless they contain an eval, but calling eval within DB * pretends the eval was done in the caller's scope. */ if (!cv) break; assert(CvPADLIST(cv)); pn = PadlistNAMESARRAY(CvPADLIST(cv))[PARENT_PAD_INDEX(pn)]; assert(PadnameLEN(pn)); PadnameLVALUE_on(pn); } } static bool S_vivifies(const OPCODE type) { switch(type) { case OP_RV2AV: case OP_ASLICE: case OP_RV2HV: case OP_KVASLICE: case OP_RV2SV: case OP_HSLICE: case OP_AELEMFAST: case OP_KVHSLICE: case OP_HELEM: case OP_AELEM: return 1; } return 0; } static void S_lvref(pTHX_ OP *o, I32 type) { dVAR; OP *kid; switch (o->op_type) { case OP_COND_EXPR: for (kid = OpSIBLING(cUNOPo->op_first); kid; kid = OpSIBLING(kid)) S_lvref(aTHX_ kid, type); /* FALLTHROUGH */ case OP_PUSHMARK: return; case OP_RV2AV: if (cUNOPo->op_first->op_type != OP_GV) goto badref; o->op_flags |= OPf_STACKED; if (o->op_flags & OPf_PARENS) { if (o->op_private & OPpLVAL_INTRO) { yyerror(Perl_form(aTHX_ "Can't modify reference to " "localized parenthesized array in list assignment")); return; } slurpy: OpTYPE_set(o, OP_LVAVREF); o->op_private &= OPpLVAL_INTRO|OPpPAD_STATE; o->op_flags |= OPf_MOD|OPf_REF; return; } o->op_private |= OPpLVREF_AV; goto checkgv; case OP_RV2CV: kid = cUNOPo->op_first; if (kid->op_type == OP_NULL) kid = cUNOPx(OpSIBLING(kUNOP->op_first)) ->op_first; o->op_private = OPpLVREF_CV; if (kid->op_type == OP_GV) o->op_flags |= OPf_STACKED; else if (kid->op_type == OP_PADCV) { o->op_targ = kid->op_targ; kid->op_targ = 0; op_free(cUNOPo->op_first); cUNOPo->op_first = NULL; o->op_flags &=~ OPf_KIDS; } else goto badref; break; case OP_RV2HV: if (o->op_flags & OPf_PARENS) { parenhash: yyerror(Perl_form(aTHX_ "Can't modify reference to " "parenthesized hash in list assignment")); return; } o->op_private |= OPpLVREF_HV; /* FALLTHROUGH */ case OP_RV2SV: checkgv: if (cUNOPo->op_first->op_type != OP_GV) goto badref; o->op_flags |= OPf_STACKED; break; case OP_PADHV: if (o->op_flags & OPf_PARENS) goto parenhash; o->op_private |= OPpLVREF_HV; /* FALLTHROUGH */ case OP_PADSV: PAD_COMPNAME_GEN_set(o->op_targ, PERL_INT_MAX); break; case OP_PADAV: PAD_COMPNAME_GEN_set(o->op_targ, PERL_INT_MAX); if (o->op_flags & OPf_PARENS) goto slurpy; o->op_private |= OPpLVREF_AV; break; case OP_AELEM: case OP_HELEM: o->op_private |= OPpLVREF_ELEM; o->op_flags |= OPf_STACKED; break; case OP_ASLICE: case OP_HSLICE: OpTYPE_set(o, OP_LVREFSLICE); o->op_private &= OPpLVAL_INTRO; return; case OP_NULL: if (o->op_flags & OPf_SPECIAL) /* do BLOCK */ goto badref; else if (!(o->op_flags & OPf_KIDS)) return; if (o->op_targ != OP_LIST) { S_lvref(aTHX_ cBINOPo->op_first, type); return; } /* FALLTHROUGH */ case OP_LIST: for (kid = cLISTOPo->op_first; kid; kid = OpSIBLING(kid)) { assert((kid->op_flags & OPf_WANT) != OPf_WANT_VOID); S_lvref(aTHX_ kid, type); } return; case OP_STUB: if (o->op_flags & OPf_PARENS) return; /* FALLTHROUGH */ default: badref: /* diag_listed_as: Can't modify reference to %s in %s assignment */ yyerror(Perl_form(aTHX_ "Can't modify reference to %s in %s", o->op_type == OP_NULL && o->op_flags & OPf_SPECIAL ? "do block" : OP_DESC(o), PL_op_desc[type])); return; } OpTYPE_set(o, OP_LVREF); o->op_private &= OPpLVAL_INTRO|OPpLVREF_ELEM|OPpLVREF_TYPE|OPpPAD_STATE; if (type == OP_ENTERLOOP) o->op_private |= OPpLVREF_ITER; } PERL_STATIC_INLINE bool S_potential_mod_type(I32 type) { /* Types that only potentially result in modification. */ return type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN || type == OP_LEAVESUBLV; } OP * Perl_op_lvalue_flags(pTHX_ OP *o, I32 type, U32 flags) { dVAR; OP *kid; /* -1 = error on localize, 0 = ignore localize, 1 = ok to localize */ int localize = -1; if (!o || (PL_parser && PL_parser->error_count)) return o; if ((o->op_private & OPpTARGET_MY) && (PL_opargs[o->op_type] & OA_TARGLEX))/* OPp share the meaning */ { return o; } assert( (o->op_flags & OPf_WANT) != OPf_WANT_VOID ); if (type == OP_PRTF || type == OP_SPRINTF) type = OP_ENTERSUB; switch (o->op_type) { case OP_UNDEF: PL_modcount++; return o; case OP_STUB: if ((o->op_flags & OPf_PARENS)) break; goto nomod; case OP_ENTERSUB: if ((type == OP_UNDEF || type == OP_REFGEN || type == OP_LOCK) && !(o->op_flags & OPf_STACKED)) { OpTYPE_set(o, OP_RV2CV); /* entersub => rv2cv */ assert(cUNOPo->op_first->op_type == OP_NULL); op_null(((LISTOP*)cUNOPo->op_first)->op_first);/* disable pushmark */ break; } else { /* lvalue subroutine call */ o->op_private |= OPpLVAL_INTRO; PL_modcount = RETURN_UNLIMITED_NUMBER; if (S_potential_mod_type(type)) { o->op_private |= OPpENTERSUB_INARGS; break; } else { /* Compile-time error message: */ OP *kid = cUNOPo->op_first; CV *cv; GV *gv; SV *namesv; if (kid->op_type != OP_PUSHMARK) { if (kid->op_type != OP_NULL || kid->op_targ != OP_LIST) Perl_croak(aTHX_ "panic: unexpected lvalue entersub " "args: type/targ %ld:%" UVuf, (long)kid->op_type, (UV)kid->op_targ); kid = kLISTOP->op_first; } while (OpHAS_SIBLING(kid)) kid = OpSIBLING(kid); if (!(kid->op_type == OP_NULL && kid->op_targ == OP_RV2CV)) { break; /* Postpone until runtime */ } kid = kUNOP->op_first; if (kid->op_type == OP_NULL && kid->op_targ == OP_RV2SV) kid = kUNOP->op_first; if (kid->op_type == OP_NULL) Perl_croak(aTHX_ "Unexpected constant lvalue entersub " "entry via type/targ %ld:%" UVuf, (long)kid->op_type, (UV)kid->op_targ); if (kid->op_type != OP_GV) { break; } gv = kGVOP_gv; cv = isGV(gv) ? GvCV(gv) : SvROK(gv) && SvTYPE(SvRV(gv)) == SVt_PVCV ? MUTABLE_CV(SvRV(gv)) : NULL; if (!cv) break; if (CvLVALUE(cv)) break; if (flags & OP_LVALUE_NO_CROAK) return NULL; namesv = cv_name(cv, NULL, 0); yyerror_pv(Perl_form(aTHX_ "Can't modify non-lvalue " "subroutine call of &%" SVf " in %s", SVfARG(namesv), PL_op_desc[type]), SvUTF8(namesv)); return o; } } /* FALLTHROUGH */ default: nomod: if (flags & OP_LVALUE_NO_CROAK) return NULL; /* grep, foreach, subcalls, refgen */ if (S_potential_mod_type(type)) break; yyerror(Perl_form(aTHX_ "Can't modify %s in %s", (o->op_type == OP_NULL && (o->op_flags & OPf_SPECIAL) ? "do block" : OP_DESC(o)), type ? PL_op_desc[type] : "local")); return o; case OP_PREINC: case OP_PREDEC: case OP_POW: case OP_MULTIPLY: case OP_DIVIDE: case OP_MODULO: case OP_ADD: case OP_SUBTRACT: case OP_CONCAT: case OP_LEFT_SHIFT: case OP_RIGHT_SHIFT: case OP_BIT_AND: case OP_BIT_XOR: case OP_BIT_OR: case OP_I_MULTIPLY: case OP_I_DIVIDE: case OP_I_MODULO: case OP_I_ADD: case OP_I_SUBTRACT: if (!(o->op_flags & OPf_STACKED)) goto nomod; PL_modcount++; break; case OP_REPEAT: if (o->op_flags & OPf_STACKED) { PL_modcount++; break; } if (!(o->op_private & OPpREPEAT_DOLIST)) goto nomod; else { const I32 mods = PL_modcount; modkids(cBINOPo->op_first, type); if (type != OP_AASSIGN) goto nomod; kid = cBINOPo->op_last; if (kid->op_type == OP_CONST && SvIOK(kSVOP_sv)) { const IV iv = SvIV(kSVOP_sv); if (PL_modcount != RETURN_UNLIMITED_NUMBER) PL_modcount = mods + (PL_modcount - mods) * (iv < 0 ? 0 : iv); } else PL_modcount = RETURN_UNLIMITED_NUMBER; } break; case OP_COND_EXPR: localize = 1; for (kid = OpSIBLING(cUNOPo->op_first); kid; kid = OpSIBLING(kid)) op_lvalue(kid, type); break; case OP_RV2AV: case OP_RV2HV: if (type == OP_REFGEN && o->op_flags & OPf_PARENS) { PL_modcount = RETURN_UNLIMITED_NUMBER; return o; /* Treat \(@foo) like ordinary list. */ } /* FALLTHROUGH */ case OP_RV2GV: if (scalar_mod_type(o, type)) goto nomod; ref(cUNOPo->op_first, o->op_type); /* FALLTHROUGH */ case OP_ASLICE: case OP_HSLICE: localize = 1; /* FALLTHROUGH */ case OP_AASSIGN: /* Do not apply the lvsub flag for rv2[ah]v in scalar context. */ if (type == OP_LEAVESUBLV && ( (o->op_type != OP_RV2AV && o->op_type != OP_RV2HV) || (o->op_flags & OPf_WANT) != OPf_WANT_SCALAR )) o->op_private |= OPpMAYBE_LVSUB; /* FALLTHROUGH */ case OP_NEXTSTATE: case OP_DBSTATE: PL_modcount = RETURN_UNLIMITED_NUMBER; break; case OP_KVHSLICE: case OP_KVASLICE: case OP_AKEYS: if (type == OP_LEAVESUBLV) o->op_private |= OPpMAYBE_LVSUB; goto nomod; case OP_AVHVSWITCH: if (type == OP_LEAVESUBLV && (o->op_private & OPpAVHVSWITCH_MASK) + OP_EACH == OP_KEYS) o->op_private |= OPpMAYBE_LVSUB; goto nomod; case OP_AV2ARYLEN: PL_hints |= HINT_BLOCK_SCOPE; if (type == OP_LEAVESUBLV) o->op_private |= OPpMAYBE_LVSUB; PL_modcount++; break; case OP_RV2SV: ref(cUNOPo->op_first, o->op_type); localize = 1; /* FALLTHROUGH */ case OP_GV: PL_hints |= HINT_BLOCK_SCOPE; /* FALLTHROUGH */ case OP_SASSIGN: case OP_ANDASSIGN: case OP_ORASSIGN: case OP_DORASSIGN: PL_modcount++; break; case OP_AELEMFAST: case OP_AELEMFAST_LEX: localize = -1; PL_modcount++; break; case OP_PADAV: case OP_PADHV: PL_modcount = RETURN_UNLIMITED_NUMBER; if (type == OP_REFGEN && o->op_flags & OPf_PARENS) return o; /* Treat \(@foo) like ordinary list. */ if (scalar_mod_type(o, type)) goto nomod; if ((o->op_flags & OPf_WANT) != OPf_WANT_SCALAR && type == OP_LEAVESUBLV) o->op_private |= OPpMAYBE_LVSUB; /* FALLTHROUGH */ case OP_PADSV: PL_modcount++; if (!type) /* local() */ Perl_croak(aTHX_ "Can't localize lexical variable %" PNf, PNfARG(PAD_COMPNAME(o->op_targ))); if (!(o->op_private & OPpLVAL_INTRO) || ( type != OP_SASSIGN && type != OP_AASSIGN && PadnameIsSTATE(PAD_COMPNAME_SV(o->op_targ)) )) S_mark_padname_lvalue(aTHX_ PAD_COMPNAME_SV(o->op_targ)); break; case OP_PUSHMARK: localize = 0; break; case OP_KEYS: if (type != OP_LEAVESUBLV && !scalar_mod_type(NULL, type)) goto nomod; goto lvalue_func; case OP_SUBSTR: if (o->op_private == 4) /* don't allow 4 arg substr as lvalue */ goto nomod; /* FALLTHROUGH */ case OP_POS: case OP_VEC: lvalue_func: if (type == OP_LEAVESUBLV) o->op_private |= OPpMAYBE_LVSUB; if (o->op_flags & OPf_KIDS && OpHAS_SIBLING(cBINOPo->op_first)) { /* substr and vec */ /* If this op is in merely potential (non-fatal) modifiable context, then apply OP_ENTERSUB context to the kid op (to avoid croaking). Other- wise pass this op’s own type so the correct op is mentioned in error messages. */ op_lvalue(OpSIBLING(cBINOPo->op_first), S_potential_mod_type(type) ? (I32)OP_ENTERSUB : o->op_type); } break; case OP_AELEM: case OP_HELEM: ref(cBINOPo->op_first, o->op_type); if (type == OP_ENTERSUB && !(o->op_private & (OPpLVAL_INTRO | OPpDEREF))) o->op_private |= OPpLVAL_DEFER; if (type == OP_LEAVESUBLV) o->op_private |= OPpMAYBE_LVSUB; localize = 1; PL_modcount++; break; case OP_LEAVE: case OP_LEAVELOOP: o->op_private |= OPpLVALUE; /* FALLTHROUGH */ case OP_SCOPE: case OP_ENTER: case OP_LINESEQ: localize = 0; if (o->op_flags & OPf_KIDS) op_lvalue(cLISTOPo->op_last, type); break; case OP_NULL: localize = 0; if (o->op_flags & OPf_SPECIAL) /* do BLOCK */ goto nomod; else if (!(o->op_flags & OPf_KIDS)) break; if (o->op_targ != OP_LIST) { OP *sib = OpSIBLING(cLISTOPo->op_first); /* OP_TRANS and OP_TRANSR with argument have a weird optree * that looks like * * null * arg * trans * * compared with things like OP_MATCH which have the argument * as a child: * * match * arg * * so handle specially to correctly get "Can't modify" croaks etc */ if (sib && (sib->op_type == OP_TRANS || sib->op_type == OP_TRANSR)) { /* this should trigger a "Can't modify transliteration" err */ op_lvalue(sib, type); } op_lvalue(cBINOPo->op_first, type); break; } /* FALLTHROUGH */ case OP_LIST: localize = 0; for (kid = cLISTOPo->op_first; kid; kid = OpSIBLING(kid)) /* elements might be in void context because the list is in scalar context or because they are attribute sub calls */ if ( (kid->op_flags & OPf_WANT) != OPf_WANT_VOID ) op_lvalue(kid, type); break; case OP_COREARGS: return o; case OP_AND: case OP_OR: if (type == OP_LEAVESUBLV || !S_vivifies(cLOGOPo->op_first->op_type)) op_lvalue(cLOGOPo->op_first, type); if (type == OP_LEAVESUBLV || !S_vivifies(OpSIBLING(cLOGOPo->op_first)->op_type)) op_lvalue(OpSIBLING(cLOGOPo->op_first), type); goto nomod; case OP_SREFGEN: if (type == OP_NULL) { /* local */ local_refgen: if (!FEATURE_MYREF_IS_ENABLED) Perl_croak(aTHX_ "The experimental declared_refs " "feature is not enabled"); Perl_ck_warner_d(aTHX_ packWARN(WARN_EXPERIMENTAL__DECLARED_REFS), "Declaring references is experimental"); op_lvalue(cUNOPo->op_first, OP_NULL); return o; } if (type != OP_AASSIGN && type != OP_SASSIGN && type != OP_ENTERLOOP) goto nomod; /* Don’t bother applying lvalue context to the ex-list. */ kid = cUNOPx(cUNOPo->op_first)->op_first; assert (!OpHAS_SIBLING(kid)); goto kid_2lvref; case OP_REFGEN: if (type == OP_NULL) /* local */ goto local_refgen; if (type != OP_AASSIGN) goto nomod; kid = cUNOPo->op_first; kid_2lvref: { const U8 ec = PL_parser ? PL_parser->error_count : 0; S_lvref(aTHX_ kid, type); if (!PL_parser || PL_parser->error_count == ec) { if (!FEATURE_REFALIASING_IS_ENABLED) Perl_croak(aTHX_ "Experimental aliasing via reference not enabled"); Perl_ck_warner_d(aTHX_ packWARN(WARN_EXPERIMENTAL__REFALIASING), "Aliasing via reference is experimental"); } } if (o->op_type == OP_REFGEN) op_null(cUNOPx(cUNOPo->op_first)->op_first); /* pushmark */ op_null(o); return o; case OP_SPLIT: if ((o->op_private & OPpSPLIT_ASSIGN)) { /* This is actually @array = split. */ PL_modcount = RETURN_UNLIMITED_NUMBER; break; } goto nomod; case OP_SCALAR: op_lvalue(cUNOPo->op_first, OP_ENTERSUB); goto nomod; } /* [20011101.069 (#7861)] File test operators interpret OPf_REF to mean that their argument is a filehandle; thus \stat(".") should not set it. AMS 20011102 */ if (type == OP_REFGEN && PL_check[o->op_type] == Perl_ck_ftst) return o; if (type != OP_LEAVESUBLV) o->op_flags |= OPf_MOD; if (type == OP_AASSIGN || type == OP_SASSIGN) o->op_flags |= OPf_SPECIAL |(o->op_type == OP_ENTERSUB ? 0 : OPf_REF); else if (!type) { /* local() */ switch (localize) { case 1: o->op_private |= OPpLVAL_INTRO; o->op_flags &= ~OPf_SPECIAL; PL_hints |= HINT_BLOCK_SCOPE; break; case 0: break; case -1: Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX), "Useless localization of %s", OP_DESC(o)); } } else if (type != OP_GREPSTART && type != OP_ENTERSUB && type != OP_LEAVESUBLV && o->op_type != OP_ENTERSUB) o->op_flags |= OPf_REF; return o; } STATIC bool S_scalar_mod_type(const OP *o, I32 type) { switch (type) { case OP_POS: case OP_SASSIGN: if (o && o->op_type == OP_RV2GV) return FALSE; /* FALLTHROUGH */ case OP_PREINC: case OP_PREDEC: case OP_POSTINC: case OP_POSTDEC: case OP_I_PREINC: case OP_I_PREDEC: case OP_I_POSTINC: case OP_I_POSTDEC: case OP_POW: case OP_MULTIPLY: case OP_DIVIDE: case OP_MODULO: case OP_REPEAT: case OP_ADD: case OP_SUBTRACT: case OP_I_MULTIPLY: case OP_I_DIVIDE: case OP_I_MODULO: case OP_I_ADD: case OP_I_SUBTRACT: case OP_LEFT_SHIFT: case OP_RIGHT_SHIFT: case OP_BIT_AND: case OP_BIT_XOR: case OP_BIT_OR: case OP_NBIT_AND: case OP_NBIT_XOR: case OP_NBIT_OR: case OP_SBIT_AND: case OP_SBIT_XOR: case OP_SBIT_OR: case OP_CONCAT: case OP_SUBST: case OP_TRANS: case OP_TRANSR: case OP_READ: case OP_SYSREAD: case OP_RECV: case OP_ANDASSIGN: case OP_ORASSIGN: case OP_DORASSIGN: case OP_VEC: case OP_SUBSTR: return TRUE; default: return FALSE; } } STATIC bool S_is_handle_constructor(const OP *o, I32 numargs) { PERL_ARGS_ASSERT_IS_HANDLE_CONSTRUCTOR; switch (o->op_type) { case OP_PIPE_OP: case OP_SOCKPAIR: if (numargs == 2) return TRUE; /* FALLTHROUGH */ case OP_SYSOPEN: case OP_OPEN: case OP_SELECT: /* XXX c.f. SelectSaver.pm */ case OP_SOCKET: case OP_OPEN_DIR: case OP_ACCEPT: if (numargs == 1) return TRUE; /* FALLTHROUGH */ default: return FALSE; } } static OP * S_refkids(pTHX_ OP *o, I32 type) { if (o && o->op_flags & OPf_KIDS) { OP *kid; for (kid = cLISTOPo->op_first; kid; kid = OpSIBLING(kid)) ref(kid, type); } return o; } OP * Perl_doref(pTHX_ OP *o, I32 type, bool set_op_ref) { dVAR; OP *kid; PERL_ARGS_ASSERT_DOREF; if (PL_parser && PL_parser->error_count) return o; switch (o->op_type) { case OP_ENTERSUB: if ((type == OP_EXISTS || type == OP_DEFINED) && !(o->op_flags & OPf_STACKED)) { OpTYPE_set(o, OP_RV2CV); /* entersub => rv2cv */ assert(cUNOPo->op_first->op_type == OP_NULL); op_null(((LISTOP*)cUNOPo->op_first)->op_first); /* disable pushmark */ o->op_flags |= OPf_SPECIAL; } else if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV){ o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV : type == OP_RV2HV ? OPpDEREF_HV : OPpDEREF_SV); o->op_flags |= OPf_MOD; } break; case OP_COND_EXPR: for (kid = OpSIBLING(cUNOPo->op_first); kid; kid = OpSIBLING(kid)) doref(kid, type, set_op_ref); break; case OP_RV2SV: if (type == OP_DEFINED) o->op_flags |= OPf_SPECIAL; /* don't create GV */ doref(cUNOPo->op_first, o->op_type, set_op_ref); /* FALLTHROUGH */ case OP_PADSV: if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) { o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV : type == OP_RV2HV ? OPpDEREF_HV : OPpDEREF_SV); o->op_flags |= OPf_MOD; } break; case OP_RV2AV: case OP_RV2HV: if (set_op_ref) o->op_flags |= OPf_REF; /* FALLTHROUGH */ case OP_RV2GV: if (type == OP_DEFINED) o->op_flags |= OPf_SPECIAL; /* don't create GV */ doref(cUNOPo->op_first, o->op_type, set_op_ref); break; case OP_PADAV: case OP_PADHV: if (set_op_ref) o->op_flags |= OPf_REF; break; case OP_SCALAR: case OP_NULL: if (!(o->op_flags & OPf_KIDS) || type == OP_DEFINED) break; doref(cBINOPo->op_first, type, set_op_ref); break; case OP_AELEM: case OP_HELEM: doref(cBINOPo->op_first, o->op_type, set_op_ref); if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) { o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV : type == OP_RV2HV ? OPpDEREF_HV : OPpDEREF_SV); o->op_flags |= OPf_MOD; } break; case OP_SCOPE: case OP_LEAVE: set_op_ref = FALSE; /* FALLTHROUGH */ case OP_ENTER: case OP_LIST: if (!(o->op_flags & OPf_KIDS)) break; doref(cLISTOPo->op_last, type, set_op_ref); break; default: break; } return scalar(o); } STATIC OP * S_dup_attrlist(pTHX_ OP *o) { OP *rop; PERL_ARGS_ASSERT_DUP_ATTRLIST; /* An attrlist is either a simple OP_CONST or an OP_LIST with kids, * where the first kid is OP_PUSHMARK and the remaining ones * are OP_CONST. We need to push the OP_CONST values. */ if (o->op_type == OP_CONST) rop = newSVOP(OP_CONST, o->op_flags, SvREFCNT_inc_NN(cSVOPo->op_sv)); else { assert((o->op_type == OP_LIST) && (o->op_flags & OPf_KIDS)); rop = NULL; for (o = cLISTOPo->op_first; o; o = OpSIBLING(o)) { if (o->op_type == OP_CONST) rop = op_append_elem(OP_LIST, rop, newSVOP(OP_CONST, o->op_flags, SvREFCNT_inc_NN(cSVOPo->op_sv))); } } return rop; } STATIC void S_apply_attrs(pTHX_ HV *stash, SV *target, OP *attrs) { PERL_ARGS_ASSERT_APPLY_ATTRS; { SV * const stashsv = newSVhek(HvNAME_HEK(stash)); /* fake up C */ #define ATTRSMODULE "attributes" #define ATTRSMODULE_PM "attributes.pm" Perl_load_module( aTHX_ PERL_LOADMOD_IMPORT_OPS, newSVpvs(ATTRSMODULE), NULL, op_prepend_elem(OP_LIST, newSVOP(OP_CONST, 0, stashsv), op_prepend_elem(OP_LIST, newSVOP(OP_CONST, 0, newRV(target)), dup_attrlist(attrs)))); } } STATIC void S_apply_attrs_my(pTHX_ HV *stash, OP *target, OP *attrs, OP **imopsp) { OP *pack, *imop, *arg; SV *meth, *stashsv, **svp; PERL_ARGS_ASSERT_APPLY_ATTRS_MY; if (!attrs) return; assert(target->op_type == OP_PADSV || target->op_type == OP_PADHV || target->op_type == OP_PADAV); /* Ensure that attributes.pm is loaded. */ /* Don't force the C if we don't need it. */ svp = hv_fetchs(GvHVn(PL_incgv), ATTRSMODULE_PM, FALSE); if (svp && *svp != &PL_sv_undef) NOOP; /* already in %INC */ else Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, newSVpvs(ATTRSMODULE), NULL); /* Need package name for method call. */ pack = newSVOP(OP_CONST, 0, newSVpvs(ATTRSMODULE)); /* Build up the real arg-list. */ stashsv = newSVhek(HvNAME_HEK(stash)); arg = newOP(OP_PADSV, 0); arg->op_targ = target->op_targ; arg = op_prepend_elem(OP_LIST, newSVOP(OP_CONST, 0, stashsv), op_prepend_elem(OP_LIST, newUNOP(OP_REFGEN, 0, arg), dup_attrlist(attrs))); /* Fake up a method call to import */ meth = newSVpvs_share("import"); imop = op_convert_list(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL|OPf_WANT_VOID, op_append_elem(OP_LIST, op_prepend_elem(OP_LIST, pack, arg), newMETHOP_named(OP_METHOD_NAMED, 0, meth))); /* Combine the ops. */ *imopsp = op_append_elem(OP_LIST, *imopsp, imop); } /* =notfor apidoc apply_attrs_string Attempts to apply a list of attributes specified by the C and C arguments to the subroutine identified by the C argument which is expected to be associated with the package identified by the C argument (see L). It gets this wrong, though, in that it does not correctly identify the boundaries of the individual attribute specifications within C. This is not really intended for the public API, but has to be listed here for systems such as AIX which need an explicit export list for symbols. (It's called from XS code in support of the C keyword from F.) Patches to fix it to respect attribute syntax properly would be welcome. =cut */ void Perl_apply_attrs_string(pTHX_ const char *stashpv, CV *cv, const char *attrstr, STRLEN len) { OP *attrs = NULL; PERL_ARGS_ASSERT_APPLY_ATTRS_STRING; if (!len) { len = strlen(attrstr); } while (len) { for (; isSPACE(*attrstr) && len; --len, ++attrstr) ; if (len) { const char * const sstr = attrstr; for (; !isSPACE(*attrstr) && len; --len, ++attrstr) ; attrs = op_append_elem(OP_LIST, attrs, newSVOP(OP_CONST, 0, newSVpvn(sstr, attrstr-sstr))); } } Perl_load_module(aTHX_ PERL_LOADMOD_IMPORT_OPS, newSVpvs(ATTRSMODULE), NULL, op_prepend_elem(OP_LIST, newSVOP(OP_CONST, 0, newSVpv(stashpv,0)), op_prepend_elem(OP_LIST, newSVOP(OP_CONST, 0, newRV(MUTABLE_SV(cv))), attrs))); } STATIC void S_move_proto_attr(pTHX_ OP **proto, OP **attrs, const GV * name, bool curstash) { OP *new_proto = NULL; STRLEN pvlen; char *pv; OP *o; PERL_ARGS_ASSERT_MOVE_PROTO_ATTR; if (!*attrs) return; o = *attrs; if (o->op_type == OP_CONST) { pv = SvPV(cSVOPo_sv, pvlen); if (memBEGINs(pv, pvlen, "prototype(")) { SV * const tmpsv = newSVpvn_flags(pv + 10, pvlen - 11, SvUTF8(cSVOPo_sv)); SV ** const tmpo = cSVOPx_svp(o); SvREFCNT_dec(cSVOPo_sv); *tmpo = tmpsv; new_proto = o; *attrs = NULL; } } else if (o->op_type == OP_LIST) { OP * lasto; assert(o->op_flags & OPf_KIDS); lasto = cLISTOPo->op_first; assert(lasto->op_type == OP_PUSHMARK); for (o = OpSIBLING(lasto); o; o = OpSIBLING(o)) { if (o->op_type == OP_CONST) { pv = SvPV(cSVOPo_sv, pvlen); if (memBEGINs(pv, pvlen, "prototype(")) { SV * const tmpsv = newSVpvn_flags(pv + 10, pvlen - 11, SvUTF8(cSVOPo_sv)); SV ** const tmpo = cSVOPx_svp(o); SvREFCNT_dec(cSVOPo_sv); *tmpo = tmpsv; if (new_proto && ckWARN(WARN_MISC)) { STRLEN new_len; const char * newp = SvPV(cSVOPo_sv, new_len); Perl_warner(aTHX_ packWARN(WARN_MISC), "Attribute prototype(%" UTF8f ") discards earlier prototype attribute in same sub", UTF8fARG(SvUTF8(cSVOPo_sv), new_len, newp)); op_free(new_proto); } else if (new_proto) op_free(new_proto); new_proto = o; /* excise new_proto from the list */ op_sibling_splice(*attrs, lasto, 1, NULL); o = lasto; continue; } } lasto = o; } /* If the list is now just the PUSHMARK, scrap the whole thing; otherwise attributes.xs would get pulled in with no real need */ if (!OpHAS_SIBLING(cLISTOPx(*attrs)->op_first)) { op_free(*attrs); *attrs = NULL; } } if (new_proto) { SV *svname; if (isGV(name)) { svname = sv_newmortal(); gv_efullname3(svname, name, NULL); } else if (SvPOK(name) && *SvPVX((SV *)name) == '&') svname = newSVpvn_flags(SvPVX((SV *)name)+1, SvCUR(name)-1, SvUTF8(name)|SVs_TEMP); else svname = (SV *)name; if (ckWARN(WARN_ILLEGALPROTO)) (void)validate_proto(svname, cSVOPx_sv(new_proto), TRUE, curstash); if (*proto && ckWARN(WARN_PROTOTYPE)) { STRLEN old_len, new_len; const char * oldp = SvPV(cSVOPx_sv(*proto), old_len); const char * newp = SvPV(cSVOPx_sv(new_proto), new_len); if (curstash && svname == (SV *)name && !memchr(SvPVX(svname), ':', SvCUR(svname))) { svname = sv_2mortal(newSVsv(PL_curstname)); sv_catpvs(svname, "::"); sv_catsv(svname, (SV *)name); } Perl_warner(aTHX_ packWARN(WARN_PROTOTYPE), "Prototype '%" UTF8f "' overridden by attribute 'prototype(%" UTF8f ")'" " in %" SVf, UTF8fARG(SvUTF8(cSVOPx_sv(*proto)), old_len, oldp), UTF8fARG(SvUTF8(cSVOPx_sv(new_proto)), new_len, newp), SVfARG(svname)); } if (*proto) op_free(*proto); *proto = new_proto; } } static void S_cant_declare(pTHX_ OP *o) { if (o->op_type == OP_NULL && (o->op_flags & (OPf_SPECIAL|OPf_KIDS)) == OPf_KIDS) o = cUNOPo->op_first; yyerror(Perl_form(aTHX_ "Can't declare %s in \"%s\"", o->op_type == OP_NULL && o->op_flags & OPf_SPECIAL ? "do block" : OP_DESC(o), PL_parser->in_my == KEY_our ? "our" : PL_parser->in_my == KEY_state ? "state" : "my")); } STATIC OP * S_my_kid(pTHX_ OP *o, OP *attrs, OP **imopsp) { I32 type; const bool stately = PL_parser && PL_parser->in_my == KEY_state; PERL_ARGS_ASSERT_MY_KID; if (!o || (PL_parser && PL_parser->error_count)) return o; type = o->op_type; if (OP_TYPE_IS_OR_WAS(o, OP_LIST)) { OP *kid; for (kid = cLISTOPo->op_first; kid; kid = OpSIBLING(kid)) my_kid(kid, attrs, imopsp); return o; } else if (type == OP_UNDEF || type == OP_STUB) { return o; } else if (type == OP_RV2SV || /* "our" declaration */ type == OP_RV2AV || type == OP_RV2HV) { if (cUNOPo->op_first->op_type != OP_GV) { /* MJD 20011224 */ S_cant_declare(aTHX_ o); } else if (attrs) { GV * const gv = cGVOPx_gv(cUNOPo->op_first); assert(PL_parser); PL_parser->in_my = FALSE; PL_parser->in_my_stash = NULL; apply_attrs(GvSTASH(gv), (type == OP_RV2SV ? GvSVn(gv) : type == OP_RV2AV ? MUTABLE_SV(GvAVn(gv)) : type == OP_RV2HV ? MUTABLE_SV(GvHVn(gv)) : MUTABLE_SV(gv)), attrs); } o->op_private |= OPpOUR_INTRO; return o; } else if (type == OP_REFGEN || type == OP_SREFGEN) { if (!FEATURE_MYREF_IS_ENABLED) Perl_croak(aTHX_ "The experimental declared_refs " "feature is not enabled"); Perl_ck_warner_d(aTHX_ packWARN(WARN_EXPERIMENTAL__DECLARED_REFS), "Declaring references is experimental"); /* Kid is a nulled OP_LIST, handled above. */ my_kid(cUNOPo->op_first, attrs, imopsp); return o; } else if (type != OP_PADSV && type != OP_PADAV && type != OP_PADHV && type != OP_PUSHMARK) { S_cant_declare(aTHX_ o); return o; } else if (attrs && type != OP_PUSHMARK) { HV *stash; assert(PL_parser); PL_parser->in_my = FALSE; PL_parser->in_my_stash = NULL; /* check for C when deciding package */ stash = PAD_COMPNAME_TYPE(o->op_targ); if (!stash) stash = PL_curstash; apply_attrs_my(stash, o, attrs, imopsp); } o->op_flags |= OPf_MOD; o->op_private |= OPpLVAL_INTRO; if (stately) o->op_private |= OPpPAD_STATE; return o; } OP * Perl_my_attrs(pTHX_ OP *o, OP *attrs) { OP *rops; int maybe_scalar = 0; PERL_ARGS_ASSERT_MY_ATTRS; /* [perl #17376]: this appears to be premature, and results in code such as C< our(%x); > executing in list mode rather than void mode */ #if 0 if (o->op_flags & OPf_PARENS) list(o); else maybe_scalar = 1; #else maybe_scalar = 1; #endif if (attrs) SAVEFREEOP(attrs); rops = NULL; o = my_kid(o, attrs, &rops); if (rops) { if (maybe_scalar && o->op_type == OP_PADSV) { o = scalar(op_append_list(OP_LIST, rops, o)); o->op_private |= OPpLVAL_INTRO; } else { /* The listop in rops might have a pushmark at the beginning, which will mess up list assignment. */ LISTOP * const lrops = (LISTOP *)rops; /* for brevity */ if (rops->op_type == OP_LIST && lrops->op_first && lrops->op_first->op_type == OP_PUSHMARK) { OP * const pushmark = lrops->op_first; /* excise pushmark */ op_sibling_splice(rops, NULL, 1, NULL); op_free(pushmark); } o = op_append_list(OP_LIST, o, rops); } } PL_parser->in_my = FALSE; PL_parser->in_my_stash = NULL; return o; } OP * Perl_sawparens(pTHX_ OP *o) { PERL_UNUSED_CONTEXT; if (o) o->op_flags |= OPf_PARENS; return o; } OP * Perl_bind_match(pTHX_ I32 type, OP *left, OP *right) { OP *o; bool ismatchop = 0; const OPCODE ltype = left->op_type; const OPCODE rtype = right->op_type; PERL_ARGS_ASSERT_BIND_MATCH; if ( (ltype == OP_RV2AV || ltype == OP_RV2HV || ltype == OP_PADAV || ltype == OP_PADHV) && ckWARN(WARN_MISC)) { const char * const desc = PL_op_desc[( rtype == OP_SUBST || rtype == OP_TRANS || rtype == OP_TRANSR ) ? (int)rtype : OP_MATCH]; const bool isary = ltype == OP_RV2AV || ltype == OP_PADAV; SV * const name = S_op_varname(aTHX_ left); if (name) Perl_warner(aTHX_ packWARN(WARN_MISC), "Applying %s to %" SVf " will act on scalar(%" SVf ")", desc, SVfARG(name), SVfARG(name)); else { const char * const sample = (isary ? "@array" : "%hash"); Perl_warner(aTHX_ packWARN(WARN_MISC), "Applying %s to %s will act on scalar(%s)", desc, sample, sample); } } if (rtype == OP_CONST && cSVOPx(right)->op_private & OPpCONST_BARE && cSVOPx(right)->op_private & OPpCONST_STRICT) { no_bareword_allowed(right); } /* !~ doesn't make sense with /r, so error on it for now */ if (rtype == OP_SUBST && (cPMOPx(right)->op_pmflags & PMf_NONDESTRUCT) && type == OP_NOT) /* diag_listed_as: Using !~ with %s doesn't make sense */ yyerror("Using !~ with s///r doesn't make sense"); if (rtype == OP_TRANSR && type == OP_NOT) /* diag_listed_as: Using !~ with %s doesn't make sense */ yyerror("Using !~ with tr///r doesn't make sense"); ismatchop = (rtype == OP_MATCH || rtype == OP_SUBST || rtype == OP_TRANS || rtype == OP_TRANSR) && !(right->op_flags & OPf_SPECIAL); if (ismatchop && right->op_private & OPpTARGET_MY) { right->op_targ = 0; right->op_private &= ~OPpTARGET_MY; } if (!(right->op_flags & OPf_STACKED) && !right->op_targ && ismatchop) { if (left->op_type == OP_PADSV && !(left->op_private & OPpLVAL_INTRO)) { right->op_targ = left->op_targ; op_free(left); o = right; } else { right->op_flags |= OPf_STACKED; if (rtype != OP_MATCH && rtype != OP_TRANSR && ! (rtype == OP_TRANS && right->op_private & OPpTRANS_IDENTICAL) && ! (rtype == OP_SUBST && (cPMOPx(right)->op_pmflags & PMf_NONDESTRUCT))) left = op_lvalue(left, rtype); if (right->op_type == OP_TRANS || right->op_type == OP_TRANSR) o = newBINOP(OP_NULL, OPf_STACKED, scalar(left), right); else o = op_prepend_elem(rtype, scalar(left), right); } if (type == OP_NOT) return newUNOP(OP_NOT, 0, scalar(o)); return o; } else return bind_match(type, left, pmruntime(newPMOP(OP_MATCH, 0), right, NULL, 0, 0)); } OP * Perl_invert(pTHX_ OP *o) { if (!o) return NULL; return newUNOP(OP_NOT, OPf_SPECIAL, scalar(o)); } /* =for apidoc Amx|OP *|op_scope|OP *o Wraps up an op tree with some additional ops so that at runtime a dynamic scope will be created. The original ops run in the new dynamic scope, and then, provided that they exit normally, the scope will be unwound. The additional ops used to create and unwind the dynamic scope will normally be an C/C pair, but a C op may be used instead if the ops are simple enough to not need the full dynamic scope structure. =cut */ OP * Perl_op_scope(pTHX_ OP *o) { dVAR; if (o) { if (o->op_flags & OPf_PARENS || PERLDB_NOOPT || TAINTING_get) { o = op_prepend_elem(OP_LINESEQ, newOP(OP_ENTER, 0), o); OpTYPE_set(o, OP_LEAVE); } else if (o->op_type == OP_LINESEQ) { OP *kid; OpTYPE_set(o, OP_SCOPE); kid = ((LISTOP*)o)->op_first; if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE) { op_null(kid); /* The following deals with things like 'do {1 for 1}' */ kid = OpSIBLING(kid); if (kid && (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE)) op_null(kid); } } else o = newLISTOP(OP_SCOPE, 0, o, NULL); } return o; } OP * Perl_op_unscope(pTHX_ OP *o) { if (o && o->op_type == OP_LINESEQ) { OP *kid = cLISTOPo->op_first; for(; kid; kid = OpSIBLING(kid)) if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE) op_null(kid); } return o; } /* =for apidoc Am|int|block_start|int full Handles compile-time scope entry. Arranges for hints to be restored on block exit and also handles pad sequence numbers to make lexical variables scope right. Returns a savestack index for use with C. =cut */ int Perl_block_start(pTHX_ int full) { const int retval = PL_savestack_ix; PL_compiling.cop_seq = PL_cop_seqmax; COP_SEQMAX_INC; pad_block_start(full); SAVEHINTS(); PL_hints &= ~HINT_BLOCK_SCOPE; SAVECOMPILEWARNINGS(); PL_compiling.cop_warnings = DUP_WARNINGS(PL_compiling.cop_warnings); SAVEI32(PL_compiling.cop_seq); PL_compiling.cop_seq = 0; CALL_BLOCK_HOOKS(bhk_start, full); return retval; } /* =for apidoc Am|OP *|block_end|I32 floor|OP *seq Handles compile-time scope exit. C is the savestack index returned by C, and C is the body of the block. Returns the block, possibly modified. =cut */ OP* Perl_block_end(pTHX_ I32 floor, OP *seq) { const int needblockscope = PL_hints & HINT_BLOCK_SCOPE; OP* retval = scalarseq(seq); OP *o; /* XXX Is the null PL_parser check necessary here? */ assert(PL_parser); /* Let’s find out under debugging builds. */ if (PL_parser && PL_parser->parsed_sub) { o = newSTATEOP(0, NULL, NULL); op_null(o); retval = op_append_elem(OP_LINESEQ, retval, o); } CALL_BLOCK_HOOKS(bhk_pre_end, &retval); LEAVE_SCOPE(floor); if (needblockscope) PL_hints |= HINT_BLOCK_SCOPE; /* propagate out */ o = pad_leavemy(); if (o) { /* pad_leavemy has created a sequence of introcv ops for all my subs declared in the block. We have to replicate that list with clonecv ops, to deal with this situation: sub { my sub s1; my sub s2; sub s1 { state sub foo { \&s2 } } }->() Originally, I was going to have introcv clone the CV and turn off the stale flag. Since &s1 is declared before &s2, the introcv op for &s1 is executed (on sub entry) before the one for &s2. But the &foo sub inside &s1 (which is cloned when &s1 is cloned, since it is a state sub) closes over &s2 and expects to see it in its outer CV’s pad. If the introcv op clones &s1, then &s2 is still marked stale. Since &s1 is not active, and &foo closes over &s1’s implicit entry for &s2, we get a ‘Varia- ble will not stay shared’ warning. Because it is the same stub that will be used when the introcv op for &s2 is executed, clos- ing over it is safe. Hence, we have to turn off the stale flag on all lexical subs in the block before we clone any of them. Hence, having introcv clone the sub cannot work. So we create a list of ops like this: lineseq | +-- introcv | +-- introcv | +-- introcv | . . . | +-- clonecv | +-- clonecv | +-- clonecv | . . . */ OP *kid = o->op_flags & OPf_KIDS ? cLISTOPo->op_first : o; OP * const last = o->op_flags & OPf_KIDS ? cLISTOPo->op_last : o; for (;; kid = OpSIBLING(kid)) { OP *newkid = newOP(OP_CLONECV, 0); newkid->op_targ = kid->op_targ; o = op_append_elem(OP_LINESEQ, o, newkid); if (kid == last) break; } retval = op_prepend_elem(OP_LINESEQ, o, retval); } CALL_BLOCK_HOOKS(bhk_post_end, &retval); return retval; } /* =head1 Compile-time scope hooks =for apidoc Aox||blockhook_register Register a set of hooks to be called when the Perl lexical scope changes at compile time. See L. =cut */ void Perl_blockhook_register(pTHX_ BHK *hk) { PERL_ARGS_ASSERT_BLOCKHOOK_REGISTER; Perl_av_create_and_push(aTHX_ &PL_blockhooks, newSViv(PTR2IV(hk))); } void Perl_newPROG(pTHX_ OP *o) { OP *start; PERL_ARGS_ASSERT_NEWPROG; if (PL_in_eval) { PERL_CONTEXT *cx; I32 i; if (PL_eval_root) return; PL_eval_root = newUNOP(OP_LEAVEEVAL, ((PL_in_eval & EVAL_KEEPERR) ? OPf_SPECIAL : 0), o); cx = CX_CUR(); assert(CxTYPE(cx) == CXt_EVAL); if ((cx->blk_gimme & G_WANT) == G_VOID) scalarvoid(PL_eval_root); else if ((cx->blk_gimme & G_WANT) == G_ARRAY) list(PL_eval_root); else scalar(PL_eval_root); start = op_linklist(PL_eval_root); PL_eval_root->op_next = 0; i = PL_savestack_ix; SAVEFREEOP(o); ENTER; S_process_optree(aTHX_ NULL, PL_eval_root, start); LEAVE; PL_savestack_ix = i; } else { if (o->op_type == OP_STUB) { /* This block is entered if nothing is compiled for the main program. This will be the case for an genuinely empty main program, or one which only has BEGIN blocks etc, so already run and freed. Historically (5.000) the guard above was !o. However, commit f8a08f7b8bd67b28 (Jun 2001), integrated to blead as c71fccf11fde0068, changed perly.y so that newPROG() is now called with the output of block_end(), which returns a new OP_STUB for the case of an empty optree. ByteLoader (and maybe other things) also take this path, because they set up PL_main_start and PL_main_root directly, without generating an optree. If the parsing the main program aborts (due to parse errors, or due to BEGIN or similar calling exit), then newPROG() isn't even called, and hence this code path and its cleanups are skipped. This shouldn't make a make a difference: * a non-zero return from perl_parse is a failure, and perl_destruct() should be called immediately. * however, if exit(0) is called during the parse, then perl_parse() returns 0, and perl_run() is called. As PL_main_start will be NULL, perl_run() will return promptly, and the exit code will remain 0. */ PL_comppad_name = 0; PL_compcv = 0; S_op_destroy(aTHX_ o); return; } PL_main_root = op_scope(sawparens(scalarvoid(o))); PL_curcop = &PL_compiling; start = LINKLIST(PL_main_root); PL_main_root->op_next = 0; S_process_optree(aTHX_ NULL, PL_main_root, start); cv_forget_slab(PL_compcv); PL_compcv = 0; /* Register with debugger */ if (PERLDB_INTER) { CV * const cv = get_cvs("DB::postponed", 0); if (cv) { dSP; PUSHMARK(SP); XPUSHs(MUTABLE_SV(CopFILEGV(&PL_compiling))); PUTBACK; call_sv(MUTABLE_SV(cv), G_DISCARD); } } } } OP * Perl_localize(pTHX_ OP *o, I32 lex) { PERL_ARGS_ASSERT_LOCALIZE; if (o->op_flags & OPf_PARENS) /* [perl #17376]: this appears to be premature, and results in code such as C< our(%x); > executing in list mode rather than void mode */ #if 0 list(o); #else NOOP; #endif else { if ( PL_parser->bufptr > PL_parser->oldbufptr && PL_parser->bufptr[-1] == ',' && ckWARN(WARN_PARENTHESIS)) { char *s = PL_parser->bufptr; bool sigil = FALSE; /* some heuristics to detect a potential error */ while (*s && (strchr(", \t\n", *s))) s++; while (1) { if (*s && (strchr("@$%", *s) || (!lex && *s == '*')) && *++s && (isWORDCHAR(*s) || UTF8_IS_CONTINUED(*s))) { s++; sigil = TRUE; while (*s && (isWORDCHAR(*s) || UTF8_IS_CONTINUED(*s))) s++; while (*s && (strchr(", \t\n", *s))) s++; } else break; } if (sigil && (*s == ';' || *s == '=')) { Perl_warner(aTHX_ packWARN(WARN_PARENTHESIS), "Parentheses missing around \"%s\" list", lex ? (PL_parser->in_my == KEY_our ? "our" : PL_parser->in_my == KEY_state ? "state" : "my") : "local"); } } } if (lex) o = my(o); else o = op_lvalue(o, OP_NULL); /* a bit kludgey */ PL_parser->in_my = FALSE; PL_parser->in_my_stash = NULL; return o; } OP * Perl_jmaybe(pTHX_ OP *o) { PERL_ARGS_ASSERT_JMAYBE; if (o->op_type == OP_LIST) { OP * const o2 = newSVREF(newGVOP(OP_GV, 0, gv_fetchpvs(";", GV_ADD|GV_NOTQUAL, SVt_PV))); o = op_convert_list(OP_JOIN, 0, op_prepend_elem(OP_LIST, o2, o)); } return o; } PERL_STATIC_INLINE OP * S_op_std_init(pTHX_ OP *o) { I32 type = o->op_type; PERL_ARGS_ASSERT_OP_STD_INIT; if (PL_opargs[type] & OA_RETSCALAR) scalar(o); if (PL_opargs[type] & OA_TARGET && !o->op_targ) o->op_targ = pad_alloc(type, SVs_PADTMP); return o; } PERL_STATIC_INLINE OP * S_op_integerize(pTHX_ OP *o) { I32 type = o->op_type; PERL_ARGS_ASSERT_OP_INTEGERIZE; /* integerize op. */ if ((PL_opargs[type] & OA_OTHERINT) && (PL_hints & HINT_INTEGER)) { dVAR; o->op_ppaddr = PL_ppaddr[++(o->op_type)]; } if (type == OP_NEGATE) /* XXX might want a ck_negate() for this */ cUNOPo->op_first->op_private &= ~OPpCONST_STRICT; return o; } static OP * S_fold_constants(pTHX_ OP *const o) { dVAR; OP * volatile curop; OP *newop; volatile I32 type = o->op_type; bool is_stringify; SV * volatile sv = NULL; int ret = 0; OP *old_next; SV * const oldwarnhook = PL_warnhook; SV * const olddiehook = PL_diehook; COP not_compiling; U8 oldwarn = PL_dowarn; I32 old_cxix; dJMPENV; PERL_ARGS_ASSERT_FOLD_CONSTANTS; if (!(PL_opargs[type] & OA_FOLDCONST)) goto nope; switch (type) { case OP_UCFIRST: case OP_LCFIRST: case OP_UC: case OP_LC: case OP_FC: #ifdef USE_LOCALE_CTYPE if (IN_LC_COMPILETIME(LC_CTYPE)) goto nope; #endif break; case OP_SLT: case OP_SGT: case OP_SLE: case OP_SGE: case OP_SCMP: #ifdef USE_LOCALE_COLLATE if (IN_LC_COMPILETIME(LC_COLLATE)) goto nope; #endif break; case OP_SPRINTF: /* XXX what about the numeric ops? */ #ifdef USE_LOCALE_NUMERIC if (IN_LC_COMPILETIME(LC_NUMERIC)) goto nope; #endif break; case OP_PACK: if (!OpHAS_SIBLING(cLISTOPo->op_first) || OpSIBLING(cLISTOPo->op_first)->op_type != OP_CONST) goto nope; { SV * const sv = cSVOPx_sv(OpSIBLING(cLISTOPo->op_first)); if (!SvPOK(sv) || SvGMAGICAL(sv)) goto nope; { const char *s = SvPVX_const(sv); while (s < SvEND(sv)) { if (isALPHA_FOLD_EQ(*s, 'p')) goto nope; s++; } } } break; case OP_REPEAT: if (o->op_private & OPpREPEAT_DOLIST) goto nope; break; case OP_SREFGEN: if (cUNOPx(cUNOPo->op_first)->op_first->op_type != OP_CONST || SvPADTMP(cSVOPx_sv(cUNOPx(cUNOPo->op_first)->op_first))) goto nope; } if (PL_parser && PL_parser->error_count) goto nope; /* Don't try to run w/ errors */ for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) { switch (curop->op_type) { case OP_CONST: if ( (curop->op_private & OPpCONST_BARE) && (curop->op_private & OPpCONST_STRICT)) { no_bareword_allowed(curop); goto nope; } /* FALLTHROUGH */ case OP_LIST: case OP_SCALAR: case OP_NULL: case OP_PUSHMARK: /* Foldable; move to next op in list */ break; default: /* No other op types are considered foldable */ goto nope; } } curop = LINKLIST(o); old_next = o->op_next; o->op_next = 0; PL_op = curop; old_cxix = cxstack_ix; create_eval_scope(NULL, G_FAKINGEVAL); /* Verify that we don't need to save it: */ assert(PL_curcop == &PL_compiling); StructCopy(&PL_compiling, ¬_compiling, COP); PL_curcop = ¬_compiling; /* The above ensures that we run with all the correct hints of the currently compiling COP, but that IN_PERL_RUNTIME is true. */ assert(IN_PERL_RUNTIME); PL_warnhook = PERL_WARNHOOK_FATAL; PL_diehook = NULL; JMPENV_PUSH(ret); /* Effective $^W=1. */ if ( ! (PL_dowarn & G_WARN_ALL_MASK)) PL_dowarn |= G_WARN_ON; switch (ret) { case 0: CALLRUNOPS(aTHX); sv = *(PL_stack_sp--); if (o->op_targ && sv == PAD_SV(o->op_targ)) { /* grab pad temp? */ pad_swipe(o->op_targ, FALSE); } else if (SvTEMP(sv)) { /* grab mortal temp? */ SvREFCNT_inc_simple_void(sv); SvTEMP_off(sv); } else { assert(SvIMMORTAL(sv)); } break; case 3: /* Something tried to die. Abandon constant folding. */ /* Pretend the error never happened. */ CLEAR_ERRSV(); o->op_next = old_next; break; default: JMPENV_POP; /* Don't expect 1 (setjmp failed) or 2 (something called my_exit) */ PL_warnhook = oldwarnhook; PL_diehook = olddiehook; /* XXX note that this croak may fail as we've already blown away * the stack - eg any nested evals */ Perl_croak(aTHX_ "panic: fold_constants JMPENV_PUSH returned %d", ret); } JMPENV_POP; PL_dowarn = oldwarn; PL_warnhook = oldwarnhook; PL_diehook = olddiehook; PL_curcop = &PL_compiling; /* if we croaked, depending on how we croaked the eval scope * may or may not have already been popped */ if (cxstack_ix > old_cxix) { assert(cxstack_ix == old_cxix + 1); assert(CxTYPE(CX_CUR()) == CXt_EVAL); delete_eval_scope(); } if (ret) goto nope; /* OP_STRINGIFY and constant folding are used to implement qq. Here the constant folding is an implementation detail that we want to hide. If the stringify op is itself already marked folded, however, then it is actually a folded join. */ is_stringify = type == OP_STRINGIFY && !o->op_folded; op_free(o); assert(sv); if (is_stringify) SvPADTMP_off(sv); else if (!SvIMMORTAL(sv)) { SvPADTMP_on(sv); SvREADONLY_on(sv); } newop = newSVOP(OP_CONST, 0, MUTABLE_SV(sv)); if (!is_stringify) newop->op_folded = 1; return newop; nope: return o; } static OP * S_gen_constant_list(pTHX_ OP *o) { dVAR; OP *curop, *old_next; SV * const oldwarnhook = PL_warnhook; SV * const olddiehook = PL_diehook; COP *old_curcop; U8 oldwarn = PL_dowarn; SV **svp; AV *av; I32 old_cxix; COP not_compiling; int ret = 0; dJMPENV; bool op_was_null; list(o); if (PL_parser && PL_parser->error_count) return o; /* Don't attempt to run with errors */ curop = LINKLIST(o); old_next = o->op_next; o->op_next = 0; op_was_null = o->op_type == OP_NULL; if (op_was_null) /* b3698342565fb462291fba4b432cfcd05b6eb4e1 */ o->op_type = OP_CUSTOM; CALL_PEEP(curop); if (op_was_null) o->op_type = OP_NULL; S_prune_chain_head(&curop); PL_op = curop; old_cxix = cxstack_ix; create_eval_scope(NULL, G_FAKINGEVAL); old_curcop = PL_curcop; StructCopy(old_curcop, ¬_compiling, COP); PL_curcop = ¬_compiling; /* The above ensures that we run with all the correct hints of the current COP, but that IN_PERL_RUNTIME is true. */ assert(IN_PERL_RUNTIME); PL_warnhook = PERL_WARNHOOK_FATAL; PL_diehook = NULL; JMPENV_PUSH(ret); /* Effective $^W=1. */ if ( ! (PL_dowarn & G_WARN_ALL_MASK)) PL_dowarn |= G_WARN_ON; switch (ret) { case 0: #if defined DEBUGGING && !defined DEBUGGING_RE_ONLY PL_curstackinfo->si_stack_hwm = 0; /* stop valgrind complaining */ #endif Perl_pp_pushmark(aTHX); CALLRUNOPS(aTHX); PL_op = curop; assert (!(curop->op_flags & OPf_SPECIAL)); assert(curop->op_type == OP_RANGE); Perl_pp_anonlist(aTHX); break; case 3: CLEAR_ERRSV(); o->op_next = old_next; break; default: JMPENV_POP; PL_warnhook = oldwarnhook; PL_diehook = olddiehook; Perl_croak(aTHX_ "panic: gen_constant_list JMPENV_PUSH returned %d", ret); } JMPENV_POP; PL_dowarn = oldwarn; PL_warnhook = oldwarnhook; PL_diehook = olddiehook; PL_curcop = old_curcop; if (cxstack_ix > old_cxix) { assert(cxstack_ix == old_cxix + 1); assert(CxTYPE(CX_CUR()) == CXt_EVAL); delete_eval_scope(); } if (ret) return o; OpTYPE_set(o, OP_RV2AV); o->op_flags &= ~OPf_REF; /* treat \(1..2) like an ordinary list */ o->op_flags |= OPf_PARENS; /* and flatten \(1..2,3) */ o->op_opt = 0; /* needs to be revisited in rpeep() */ av = (AV *)SvREFCNT_inc_NN(*PL_stack_sp--); /* replace subtree with an OP_CONST */ curop = ((UNOP*)o)->op_first; op_sibling_splice(o, NULL, -1, newSVOP(OP_CONST, 0, (SV *)av)); op_free(curop); if (AvFILLp(av) != -1) for (svp = AvARRAY(av) + AvFILLp(av); svp >= AvARRAY(av); --svp) { SvPADTMP_on(*svp); SvREADONLY_on(*svp); } LINKLIST(o); return list(o); } /* =head1 Optree Manipulation Functions */ /* List constructors */ /* =for apidoc Am|OP *|op_append_elem|I32 optype|OP *first|OP *last Append an item to the list of ops contained directly within a list-type op, returning the lengthened list. C is the list-type op, and C is the op to append to the list. C specifies the intended opcode for the list. If C is not already a list of the right type, it will be upgraded into one. If either C or C is null, the other is returned unchanged. =cut */ OP * Perl_op_append_elem(pTHX_ I32 type, OP *first, OP *last) { if (!first) return last; if (!last) return first; if (first->op_type != (unsigned)type || (type == OP_LIST && (first->op_flags & OPf_PARENS))) { return newLISTOP(type, 0, first, last); } op_sibling_splice(first, ((LISTOP*)first)->op_last, 0, last); first->op_flags |= OPf_KIDS; return first; } /* =for apidoc Am|OP *|op_append_list|I32 optype|OP *first|OP *last Concatenate the lists of ops contained directly within two list-type ops, returning the combined list. C and C are the list-type ops to concatenate. C specifies the intended opcode for the list. If either C or C is not already a list of the right type, it will be upgraded into one. If either C or C is null, the other is returned unchanged. =cut */ OP * Perl_op_append_list(pTHX_ I32 type, OP *first, OP *last) { if (!first) return last; if (!last) return first; if (first->op_type != (unsigned)type) return op_prepend_elem(type, first, last); if (last->op_type != (unsigned)type) return op_append_elem(type, first, last); OpMORESIB_set(((LISTOP*)first)->op_last, ((LISTOP*)last)->op_first); ((LISTOP*)first)->op_last = ((LISTOP*)last)->op_last; OpLASTSIB_set(((LISTOP*)first)->op_last, first); first->op_flags |= (last->op_flags & OPf_KIDS); S_op_destroy(aTHX_ last); return first; } /* =for apidoc Am|OP *|op_prepend_elem|I32 optype|OP *first|OP *last Prepend an item to the list of ops contained directly within a list-type op, returning the lengthened list. C is the op to prepend to the list, and C is the list-type op. C specifies the intended opcode for the list. If C is not already a list of the right type, it will be upgraded into one. If either C or C is null, the other is returned unchanged. =cut */ OP * Perl_op_prepend_elem(pTHX_ I32 type, OP *first, OP *last) { if (!first) return last; if (!last) return first; if (last->op_type == (unsigned)type) { if (type == OP_LIST) { /* already a PUSHMARK there */ /* insert 'first' after pushmark */ op_sibling_splice(last, cLISTOPx(last)->op_first, 0, first); if (!(first->op_flags & OPf_PARENS)) last->op_flags &= ~OPf_PARENS; } else op_sibling_splice(last, NULL, 0, first); last->op_flags |= OPf_KIDS; return last; } return newLISTOP(type, 0, first, last); } /* =for apidoc Am|OP *|op_convert_list|I32 type|I32 flags|OP *o Converts C into a list op if it is not one already, and then converts it into the specified C, calling its check function, allocating a target if it needs one, and folding constants. A list-type op is usually constructed one kid at a time via C, C and C. Then finally it is passed to C to make it the right type. =cut */ OP * Perl_op_convert_list(pTHX_ I32 type, I32 flags, OP *o) { dVAR; if (type < 0) type = -type, flags |= OPf_SPECIAL; if (!o || o->op_type != OP_LIST) o = force_list(o, 0); else { o->op_flags &= ~OPf_WANT; o->op_private &= ~OPpLVAL_INTRO; } if (!(PL_opargs[type] & OA_MARK)) op_null(cLISTOPo->op_first); else { OP * const kid2 = OpSIBLING(cLISTOPo->op_first); if (kid2 && kid2->op_type == OP_COREARGS) { op_null(cLISTOPo->op_first); kid2->op_private |= OPpCOREARGS_PUSHMARK; } } if (type != OP_SPLIT) /* At this point o is a LISTOP, but OP_SPLIT is a PMOP; let * ck_split() create a real PMOP and leave the op's type as listop * for now. Otherwise op_free() etc will crash. */ OpTYPE_set(o, type); o->op_flags |= flags; if (flags & OPf_FOLDED) o->op_folded = 1; o = CHECKOP(type, o); if (o->op_type != (unsigned)type) return o; return fold_constants(op_integerize(op_std_init(o))); } /* Constructors */ /* =head1 Optree construction =for apidoc Am|OP *|newNULLLIST Constructs, checks, and returns a new C op, which represents an empty list expression. =cut */ OP * Perl_newNULLLIST(pTHX) { return newOP(OP_STUB, 0); } /* promote o and any siblings to be a list if its not already; i.e. * * o - A - B * * becomes * * list * | * pushmark - o - A - B * * If nullit it true, the list op is nulled. */ static OP * S_force_list(pTHX_ OP *o, bool nullit) { if (!o || o->op_type != OP_LIST) { OP *rest = NULL; if (o) { /* manually detach any siblings then add them back later */ rest = OpSIBLING(o); OpLASTSIB_set(o, NULL); } o = newLISTOP(OP_LIST, 0, o, NULL); if (rest) op_sibling_splice(o, cLISTOPo->op_last, 0, rest); } if (nullit) op_null(o); return o; } /* =for apidoc Am|OP *|newLISTOP|I32 type|I32 flags|OP *first|OP *last Constructs, checks, and returns an op of any list type. C is the opcode. C gives the eight bits of C, except that C will be set automatically if required. C and C supply up to two ops to be direct children of the list op; they are consumed by this function and become part of the constructed op tree. For most list operators, the check function expects all the kid ops to be present already, so calling C (e.g.) is not appropriate. What you want to do in that case is create an op of type C, append more children to it, and then call L. See L for more information. =cut */ OP * Perl_newLISTOP(pTHX_ I32 type, I32 flags, OP *first, OP *last) { dVAR; LISTOP *listop; assert((PL_opargs[type] & OA_CLASS_MASK) == OA_LISTOP || type == OP_CUSTOM); NewOp(1101, listop, 1, LISTOP); OpTYPE_set(listop, type); if (first || last) flags |= OPf_KIDS; listop->op_flags = (U8)flags; if (!last && first) last = first; else if (!first && last) first = last; else if (first) OpMORESIB_set(first, last); listop->op_first = first; listop->op_last = last; if (type == OP_LIST) { OP* const pushop = newOP(OP_PUSHMARK, 0); OpMORESIB_set(pushop, first); listop->op_first = pushop; listop->op_flags |= OPf_KIDS; if (!last) listop->op_last = pushop; } if (listop->op_last) OpLASTSIB_set(listop->op_last, (OP*)listop); return CHECKOP(type, listop); } /* =for apidoc Am|OP *|newOP|I32 type|I32 flags Constructs, checks, and returns an op of any base type (any type that has no extra fields). C is the opcode. C gives the eight bits of C, and, shifted up eight bits, the eight bits of C. =cut */ OP * Perl_newOP(pTHX_ I32 type, I32 flags) { dVAR; OP *o; if (type == -OP_ENTEREVAL) { type = OP_ENTEREVAL; flags |= OPpEVAL_BYTES<<8; } assert((PL_opargs[type] & OA_CLASS_MASK) == OA_BASEOP || (PL_opargs[type] & OA_CLASS_MASK) == OA_BASEOP_OR_UNOP || (PL_opargs[type] & OA_CLASS_MASK) == OA_FILESTATOP || (PL_opargs[type] & OA_CLASS_MASK) == OA_LOOPEXOP); NewOp(1101, o, 1, OP); OpTYPE_set(o, type); o->op_flags = (U8)flags; o->op_next = o; o->op_private = (U8)(0 | (flags >> 8)); if (PL_opargs[type] & OA_RETSCALAR) scalar(o); if (PL_opargs[type] & OA_TARGET) o->op_targ = pad_alloc(type, SVs_PADTMP); return CHECKOP(type, o); } /* =for apidoc Am|OP *|newUNOP|I32 type|I32 flags|OP *first Constructs, checks, and returns an op of any unary type. C is the opcode. C gives the eight bits of C, except that C will be set automatically if required, and, shifted up eight bits, the eight bits of C, except that the bit with value 1 is automatically set. C supplies an optional op to be the direct child of the unary op; it is consumed by this function and become part of the constructed op tree. =cut */ OP * Perl_newUNOP(pTHX_ I32 type, I32 flags, OP *first) { dVAR; UNOP *unop; if (type == -OP_ENTEREVAL) { type = OP_ENTEREVAL; flags |= OPpEVAL_BYTES<<8; } assert((PL_opargs[type] & OA_CLASS_MASK) == OA_UNOP || (PL_opargs[type] & OA_CLASS_MASK) == OA_BASEOP_OR_UNOP || (PL_opargs[type] & OA_CLASS_MASK) == OA_FILESTATOP || (PL_opargs[type] & OA_CLASS_MASK) == OA_LOOPEXOP || type == OP_SASSIGN || type == OP_ENTERTRY || type == OP_CUSTOM || type == OP_NULL ); if (!first) first = newOP(OP_STUB, 0); if (PL_opargs[type] & OA_MARK) first = force_list(first, 1); NewOp(1101, unop, 1, UNOP); OpTYPE_set(unop, type); unop->op_first = first; unop->op_flags = (U8)(flags | OPf_KIDS); unop->op_private = (U8)(1 | (flags >> 8)); if (!OpHAS_SIBLING(first)) /* true unless weird syntax error */ OpLASTSIB_set(first, (OP*)unop); unop = (UNOP*) CHECKOP(type, unop); if (unop->op_next) return (OP*)unop; return fold_constants(op_integerize(op_std_init((OP *) unop))); } /* =for apidoc newUNOP_AUX Similar to C, but creates an C struct instead, with C initialised to C =cut */ OP * Perl_newUNOP_AUX(pTHX_ I32 type, I32 flags, OP *first, UNOP_AUX_item *aux) { dVAR; UNOP_AUX *unop; assert((PL_opargs[type] & OA_CLASS_MASK) == OA_UNOP_AUX || type == OP_CUSTOM); NewOp(1101, unop, 1, UNOP_AUX); unop->op_type = (OPCODE)type; unop->op_ppaddr = PL_ppaddr[type]; unop->op_first = first; unop->op_flags = (U8)(flags | (first ? OPf_KIDS : 0)); unop->op_private = (U8)((first ? 1 : 0) | (flags >> 8)); unop->op_aux = aux; if (first && !OpHAS_SIBLING(first)) /* true unless weird syntax error */ OpLASTSIB_set(first, (OP*)unop); unop = (UNOP_AUX*) CHECKOP(type, unop); return op_std_init((OP *) unop); } /* =for apidoc Am|OP *|newMETHOP|I32 type|I32 flags|OP *first Constructs, checks, and returns an op of method type with a method name evaluated at runtime. C is the opcode. C gives the eight bits of C, except that C will be set automatically, and, shifted up eight bits, the eight bits of C, except that the bit with value 1 is automatically set. C supplies an op which evaluates method name; it is consumed by this function and become part of the constructed op tree. Supported optypes: C. =cut */ static OP* S_newMETHOP_internal(pTHX_ I32 type, I32 flags, OP* dynamic_meth, SV* const_meth) { dVAR; METHOP *methop; assert((PL_opargs[type] & OA_CLASS_MASK) == OA_METHOP || type == OP_CUSTOM); NewOp(1101, methop, 1, METHOP); if (dynamic_meth) { if (PL_opargs[type] & OA_MARK) dynamic_meth = force_list(dynamic_meth, 1); methop->op_flags = (U8)(flags | OPf_KIDS); methop->op_u.op_first = dynamic_meth; methop->op_private = (U8)(1 | (flags >> 8)); if (!OpHAS_SIBLING(dynamic_meth)) OpLASTSIB_set(dynamic_meth, (OP*)methop); } else { assert(const_meth); methop->op_flags = (U8)(flags & ~OPf_KIDS); methop->op_u.op_meth_sv = const_meth; methop->op_private = (U8)(0 | (flags >> 8)); methop->op_next = (OP*)methop; } #ifdef USE_ITHREADS methop->op_rclass_targ = 0; #else methop->op_rclass_sv = NULL; #endif OpTYPE_set(methop, type); return CHECKOP(type, methop); } OP * Perl_newMETHOP (pTHX_ I32 type, I32 flags, OP* dynamic_meth) { PERL_ARGS_ASSERT_NEWMETHOP; return newMETHOP_internal(type, flags, dynamic_meth, NULL); } /* =for apidoc Am|OP *|newMETHOP_named|I32 type|I32 flags|SV *const_meth Constructs, checks, and returns an op of method type with a constant method name. C is the opcode. C gives the eight bits of C, and, shifted up eight bits, the eight bits of C. C supplies a constant method name; it must be a shared COW string. Supported optypes: C. =cut */ OP * Perl_newMETHOP_named (pTHX_ I32 type, I32 flags, SV* const_meth) { PERL_ARGS_ASSERT_NEWMETHOP_NAMED; return newMETHOP_internal(type, flags, NULL, const_meth); } /* =for apidoc Am|OP *|newBINOP|I32 type|I32 flags|OP *first|OP *last Constructs, checks, and returns an op of any binary type. C is the opcode. C gives the eight bits of C, except that C will be set automatically, and, shifted up eight bits, the eight bits of C, except that the bit with value 1 or 2 is automatically set as required. C and C supply up to two ops to be the direct children of the binary op; they are consumed by this function and become part of the constructed op tree. =cut */ OP * Perl_newBINOP(pTHX_ I32 type, I32 flags, OP *first, OP *last) { dVAR; BINOP *binop; ASSUME((PL_opargs[type] & OA_CLASS_MASK) == OA_BINOP || type == OP_NULL || type == OP_CUSTOM); NewOp(1101, binop, 1, BINOP); if (!first) first = newOP(OP_NULL, 0); OpTYPE_set(binop, type); binop->op_first = first; binop->op_flags = (U8)(flags | OPf_KIDS); if (!last) { last = first; binop->op_private = (U8)(1 | (flags >> 8)); } else { binop->op_private = (U8)(2 | (flags >> 8)); OpMORESIB_set(first, last); } if (!OpHAS_SIBLING(last)) /* true unless weird syntax error */ OpLASTSIB_set(last, (OP*)binop); binop->op_last = OpSIBLING(binop->op_first); if (binop->op_last) OpLASTSIB_set(binop->op_last, (OP*)binop); binop = (BINOP*)CHECKOP(type, binop); if (binop->op_next || binop->op_type != (OPCODE)type) return (OP*)binop; return fold_constants(op_integerize(op_std_init((OP *)binop))); } static int uvcompare(const void *a, const void *b) __attribute__nonnull__(1) __attribute__nonnull__(2) __attribute__pure__; static int uvcompare(const void *a, const void *b) { if (*((const UV *)a) < (*(const UV *)b)) return -1; if (*((const UV *)a) > (*(const UV *)b)) return 1; if (*((const UV *)a+1) < (*(const UV *)b+1)) return -1; if (*((const UV *)a+1) > (*(const UV *)b+1)) return 1; return 0; } static OP * S_pmtrans(pTHX_ OP *o, OP *expr, OP *repl) { SV * const tstr = ((SVOP*)expr)->op_sv; SV * const rstr = ((SVOP*)repl)->op_sv; STRLEN tlen; STRLEN rlen; const U8 *t = (U8*)SvPV_const(tstr, tlen); const U8 *r = (U8*)SvPV_const(rstr, rlen); I32 i; I32 j; I32 grows = 0; short *tbl; const I32 complement = o->op_private & OPpTRANS_COMPLEMENT; const I32 squash = o->op_private & OPpTRANS_SQUASH; I32 del = o->op_private & OPpTRANS_DELETE; SV* swash; PERL_ARGS_ASSERT_PMTRANS; PL_hints |= HINT_BLOCK_SCOPE; if (SvUTF8(tstr)) o->op_private |= OPpTRANS_FROM_UTF; if (SvUTF8(rstr)) o->op_private |= OPpTRANS_TO_UTF; if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF)) { SV* const listsv = newSVpvs("# comment\n"); SV* transv = NULL; const U8* tend = t + tlen; const U8* rend = r + rlen; STRLEN ulen; UV tfirst = 1; UV tlast = 0; IV tdiff; STRLEN tcount = 0; UV rfirst = 1; UV rlast = 0; IV rdiff; STRLEN rcount = 0; IV diff; I32 none = 0; U32 max = 0; I32 bits; I32 havefinal = 0; U32 final = 0; const I32 from_utf = o->op_private & OPpTRANS_FROM_UTF; const I32 to_utf = o->op_private & OPpTRANS_TO_UTF; U8* tsave = NULL; U8* rsave = NULL; const U32 flags = UTF8_ALLOW_DEFAULT; if (!from_utf) { STRLEN len = tlen; t = tsave = bytes_to_utf8(t, &len); tend = t + len; } if (!to_utf && rlen) { STRLEN len = rlen; r = rsave = bytes_to_utf8(r, &len); rend = r + len; } /* There is a snag with this code on EBCDIC: scan_const() in toke.c has * encoded chars in native encoding which makes ranges in the EBCDIC 0..255 * odd. */ if (complement) { U8 tmpbuf[UTF8_MAXBYTES+1]; UV *cp; UV nextmin = 0; Newx(cp, 2*tlen, UV); i = 0; transv = newSVpvs(""); while (t < tend) { cp[2*i] = utf8n_to_uvchr(t, tend-t, &ulen, flags); t += ulen; if (t < tend && *t == ILLEGAL_UTF8_BYTE) { t++; cp[2*i+1] = utf8n_to_uvchr(t, tend-t, &ulen, flags); t += ulen; } else { cp[2*i+1] = cp[2*i]; } i++; } qsort(cp, i, 2*sizeof(UV), uvcompare); for (j = 0; j < i; j++) { UV val = cp[2*j]; diff = val - nextmin; if (diff > 0) { t = uvchr_to_utf8(tmpbuf,nextmin); sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf); if (diff > 1) { U8 range_mark = ILLEGAL_UTF8_BYTE; t = uvchr_to_utf8(tmpbuf, val - 1); sv_catpvn(transv, (char *)&range_mark, 1); sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf); } } val = cp[2*j+1]; if (val >= nextmin) nextmin = val + 1; } t = uvchr_to_utf8(tmpbuf,nextmin); sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf); { U8 range_mark = ILLEGAL_UTF8_BYTE; sv_catpvn(transv, (char *)&range_mark, 1); } t = uvchr_to_utf8(tmpbuf, 0x7fffffff); sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf); t = (const U8*)SvPVX_const(transv); tlen = SvCUR(transv); tend = t + tlen; Safefree(cp); } else if (!rlen && !del) { r = t; rlen = tlen; rend = tend; } if (!squash) { if ((!rlen && !del) || t == r || (tlen == rlen && memEQ((char *)t, (char *)r, tlen))) { o->op_private |= OPpTRANS_IDENTICAL; } } while (t < tend || tfirst <= tlast) { /* see if we need more "t" chars */ if (tfirst > tlast) { tfirst = (I32)utf8n_to_uvchr(t, tend - t, &ulen, flags); t += ulen; if (t < tend && *t == ILLEGAL_UTF8_BYTE) { /* illegal utf8 val indicates range */ t++; tlast = (I32)utf8n_to_uvchr(t, tend - t, &ulen, flags); t += ulen; } else tlast = tfirst; } /* now see if we need more "r" chars */ if (rfirst > rlast) { if (r < rend) { rfirst = (I32)utf8n_to_uvchr(r, rend - r, &ulen, flags); r += ulen; if (r < rend && *r == ILLEGAL_UTF8_BYTE) { /* illegal utf8 val indicates range */ r++; rlast = (I32)utf8n_to_uvchr(r, rend - r, &ulen, flags); r += ulen; } else rlast = rfirst; } else { if (!havefinal++) final = rlast; rfirst = rlast = 0xffffffff; } } /* now see which range will peter out first, if either. */ tdiff = tlast - tfirst; rdiff = rlast - rfirst; tcount += tdiff + 1; rcount += rdiff + 1; if (tdiff <= rdiff) diff = tdiff; else diff = rdiff; if (rfirst == 0xffffffff) { diff = tdiff; /* oops, pretend rdiff is infinite */ if (diff > 0) Perl_sv_catpvf(aTHX_ listsv, "%04lx\t%04lx\tXXXX\n", (long)tfirst, (long)tlast); else Perl_sv_catpvf(aTHX_ listsv, "%04lx\t\tXXXX\n", (long)tfirst); } else { if (diff > 0) Perl_sv_catpvf(aTHX_ listsv, "%04lx\t%04lx\t%04lx\n", (long)tfirst, (long)(tfirst + diff), (long)rfirst); else Perl_sv_catpvf(aTHX_ listsv, "%04lx\t\t%04lx\n", (long)tfirst, (long)rfirst); if (rfirst + diff > max) max = rfirst + diff; if (!grows) grows = (tfirst < rfirst && UVCHR_SKIP(tfirst) < UVCHR_SKIP(rfirst + diff)); rfirst += diff + 1; } tfirst += diff + 1; } none = ++max; if (del) del = ++max; if (max > 0xffff) bits = 32; else if (max > 0xff) bits = 16; else bits = 8; swash = MUTABLE_SV(swash_init("utf8", "", listsv, bits, none)); #ifdef USE_ITHREADS cPADOPo->op_padix = pad_alloc(OP_TRANS, SVf_READONLY); SvREFCNT_dec(PAD_SVl(cPADOPo->op_padix)); PAD_SETSV(cPADOPo->op_padix, swash); SvPADTMP_on(swash); SvREADONLY_on(swash); #else cSVOPo->op_sv = swash; #endif SvREFCNT_dec(listsv); SvREFCNT_dec(transv); if (!del && havefinal && rlen) (void)hv_store(MUTABLE_HV(SvRV(swash)), "FINAL", 5, newSVuv((UV)final), 0); Safefree(tsave); Safefree(rsave); tlen = tcount; rlen = rcount; if (r < rend) rlen++; else if (rlast == 0xffffffff) rlen = 0; goto warnins; } tbl = (short*)PerlMemShared_calloc( (o->op_private & OPpTRANS_COMPLEMENT) && !(o->op_private & OPpTRANS_DELETE) ? 258 : 256, sizeof(short)); cPVOPo->op_pv = (char*)tbl; if (complement) { for (i = 0; i < (I32)tlen; i++) tbl[t[i]] = -1; for (i = 0, j = 0; i < 256; i++) { if (!tbl[i]) { if (j >= (I32)rlen) { if (del) tbl[i] = -2; else if (rlen) tbl[i] = r[j-1]; else tbl[i] = (short)i; } else { if (UVCHR_IS_INVARIANT(i) && ! UVCHR_IS_INVARIANT(r[j])) grows = 1; tbl[i] = r[j++]; } } } if (!del) { if (!rlen) { j = rlen; if (!squash) o->op_private |= OPpTRANS_IDENTICAL; } else if (j >= (I32)rlen) j = rlen - 1; else { tbl = (short *) PerlMemShared_realloc(tbl, (0x101+rlen-j) * sizeof(short)); cPVOPo->op_pv = (char*)tbl; } tbl[0x100] = (short)(rlen - j); for (i=0; i < (I32)rlen - j; i++) tbl[0x101+i] = r[j+i]; } } else { if (!rlen && !del) { r = t; rlen = tlen; if (!squash) o->op_private |= OPpTRANS_IDENTICAL; } else if (!squash && rlen == tlen && memEQ((char*)t, (char*)r, tlen)) { o->op_private |= OPpTRANS_IDENTICAL; } for (i = 0; i < 256; i++) tbl[i] = -1; for (i = 0, j = 0; i < (I32)tlen; i++,j++) { if (j >= (I32)rlen) { if (del) { if (tbl[t[i]] == -1) tbl[t[i]] = -2; continue; } --j; } if (tbl[t[i]] == -1) { if ( UVCHR_IS_INVARIANT(t[i]) && ! UVCHR_IS_INVARIANT(r[j])) grows = 1; tbl[t[i]] = r[j]; } } } warnins: if(del && rlen == tlen) { Perl_ck_warner(aTHX_ packWARN(WARN_MISC), "Useless use of /d modifier in transliteration operator"); } else if(rlen > tlen && !complement) { Perl_ck_warner(aTHX_ packWARN(WARN_MISC), "Replacement list is longer than search list"); } if (grows) o->op_private |= OPpTRANS_GROWS; op_free(expr); op_free(repl); return o; } /* =for apidoc Am|OP *|newPMOP|I32 type|I32 flags Constructs, checks, and returns an op of any pattern matching type. C is the opcode. C gives the eight bits of C and, shifted up eight bits, the eight bits of C. =cut */ OP * Perl_newPMOP(pTHX_ I32 type, I32 flags) { dVAR; PMOP *pmop; assert((PL_opargs[type] & OA_CLASS_MASK) == OA_PMOP || type == OP_CUSTOM); NewOp(1101, pmop, 1, PMOP); OpTYPE_set(pmop, type); pmop->op_flags = (U8)flags; pmop->op_private = (U8)(0 | (flags >> 8)); if (PL_opargs[type] & OA_RETSCALAR) scalar((OP *)pmop); if (PL_hints & HINT_RE_TAINT) pmop->op_pmflags |= PMf_RETAINT; #ifdef USE_LOCALE_CTYPE if (IN_LC_COMPILETIME(LC_CTYPE)) { set_regex_charset(&(pmop->op_pmflags), REGEX_LOCALE_CHARSET); } else #endif if (IN_UNI_8_BIT) { set_regex_charset(&(pmop->op_pmflags), REGEX_UNICODE_CHARSET); } if (PL_hints & HINT_RE_FLAGS) { SV *reflags = Perl_refcounted_he_fetch_pvn(aTHX_ PL_compiling.cop_hints_hash, STR_WITH_LEN("reflags"), 0, 0 ); if (reflags && SvOK(reflags)) pmop->op_pmflags |= SvIV(reflags); reflags = Perl_refcounted_he_fetch_pvn(aTHX_ PL_compiling.cop_hints_hash, STR_WITH_LEN("reflags_charset"), 0, 0 ); if (reflags && SvOK(reflags)) { set_regex_charset(&(pmop->op_pmflags), (regex_charset)SvIV(reflags)); } } #ifdef USE_ITHREADS assert(SvPOK(PL_regex_pad[0])); if (SvCUR(PL_regex_pad[0])) { /* Pop off the "packed" IV from the end. */ SV *const repointer_list = PL_regex_pad[0]; const char *p = SvEND(repointer_list) - sizeof(IV); const IV offset = *((IV*)p); assert(SvCUR(repointer_list) % sizeof(IV) == 0); SvEND_set(repointer_list, p); pmop->op_pmoffset = offset; /* This slot should be free, so assert this: */ assert(PL_regex_pad[offset] == &PL_sv_undef); } else { SV * const repointer = &PL_sv_undef; av_push(PL_regex_padav, repointer); pmop->op_pmoffset = av_tindex(PL_regex_padav); PL_regex_pad = AvARRAY(PL_regex_padav); } #endif return CHECKOP(type, pmop); } static void S_set_haseval(pTHX) { PADOFFSET i = 1; PL_cv_has_eval = 1; /* Any pad names in scope are potentially lvalues. */ for (; i < PadnamelistMAXNAMED(PL_comppad_name); i++) { PADNAME *pn = PAD_COMPNAME_SV(i); if (!pn || !PadnameLEN(pn)) continue; if (PadnameOUTER(pn) || PadnameIN_SCOPE(pn, PL_cop_seqmax)) S_mark_padname_lvalue(aTHX_ pn); } } /* Given some sort of match op o, and an expression expr containing a * pattern, either compile expr into a regex and attach it to o (if it's * constant), or convert expr into a runtime regcomp op sequence (if it's * not) * * Flags currently has 2 bits of meaning: * 1: isreg indicates that the pattern is part of a regex construct, eg * $x =~ /pattern/ or split /pattern/, as opposed to $x =~ $pattern or * split "pattern", which aren't. In the former case, expr will be a list * if the pattern contains more than one term (eg /a$b/). * 2: The pattern is for a split. * * When the pattern has been compiled within a new anon CV (for * qr/(?{...})/ ), then floor indicates the savestack level just before * the new sub was created */ OP * Perl_pmruntime(pTHX_ OP *o, OP *expr, OP *repl, UV flags, I32 floor) { PMOP *pm; LOGOP *rcop; I32 repl_has_vars = 0; bool is_trans = (o->op_type == OP_TRANS || o->op_type == OP_TRANSR); bool is_compiletime; bool has_code; bool isreg = cBOOL(flags & 1); bool is_split = cBOOL(flags & 2); PERL_ARGS_ASSERT_PMRUNTIME; if (is_trans) { return pmtrans(o, expr, repl); } /* find whether we have any runtime or code elements; * at the same time, temporarily set the op_next of each DO block; * then when we LINKLIST, this will cause the DO blocks to be excluded * from the op_next chain (and from having LINKLIST recursively * applied to them). We fix up the DOs specially later */ is_compiletime = 1; has_code = 0; if (expr->op_type == OP_LIST) { OP *o; for (o = cLISTOPx(expr)->op_first; o; o = OpSIBLING(o)) { if (o->op_type == OP_NULL && (o->op_flags & OPf_SPECIAL)) { has_code = 1; assert(!o->op_next); if (UNLIKELY(!OpHAS_SIBLING(o))) { assert(PL_parser && PL_parser->error_count); /* This can happen with qr/ (?{(^{})/. Just fake up the op we were expecting to see, to avoid crashing elsewhere. */ op_sibling_splice(expr, o, 0, newSVOP(OP_CONST, 0, &PL_sv_no)); } o->op_next = OpSIBLING(o); } else if (o->op_type != OP_CONST && o->op_type != OP_PUSHMARK) is_compiletime = 0; } } else if (expr->op_type != OP_CONST) is_compiletime = 0; LINKLIST(expr); /* fix up DO blocks; treat each one as a separate little sub; * also, mark any arrays as LIST/REF */ if (expr->op_type == OP_LIST) { OP *o; for (o = cLISTOPx(expr)->op_first; o; o = OpSIBLING(o)) { if (o->op_type == OP_PADAV || o->op_type == OP_RV2AV) { assert( !(o->op_flags & OPf_WANT)); /* push the array rather than its contents. The regex * engine will retrieve and join the elements later */ o->op_flags |= (OPf_WANT_LIST | OPf_REF); continue; } if (!(o->op_type == OP_NULL && (o->op_flags & OPf_SPECIAL))) continue; o->op_next = NULL; /* undo temporary hack from above */ scalar(o); LINKLIST(o); if (cLISTOPo->op_first->op_type == OP_LEAVE) { LISTOP *leaveop = cLISTOPx(cLISTOPo->op_first); /* skip ENTER */ assert(leaveop->op_first->op_type == OP_ENTER); assert(OpHAS_SIBLING(leaveop->op_first)); o->op_next = OpSIBLING(leaveop->op_first); /* skip leave */ assert(leaveop->op_flags & OPf_KIDS); assert(leaveop->op_last->op_next == (OP*)leaveop); leaveop->op_next = NULL; /* stop on last op */ op_null((OP*)leaveop); } else { /* skip SCOPE */ OP *scope = cLISTOPo->op_first; assert(scope->op_type == OP_SCOPE); assert(scope->op_flags & OPf_KIDS); scope->op_next = NULL; /* stop on last op */ op_null(scope); } if (is_compiletime) /* runtime finalizes as part of finalizing whole tree */ optimize_optree(o); /* have to peep the DOs individually as we've removed it from * the op_next chain */ CALL_PEEP(o); S_prune_chain_head(&(o->op_next)); if (is_compiletime) /* runtime finalizes as part of finalizing whole tree */ finalize_optree(o); } } else if (expr->op_type == OP_PADAV || expr->op_type == OP_RV2AV) { assert( !(expr->op_flags & OPf_WANT)); /* push the array rather than its contents. The regex * engine will retrieve and join the elements later */ expr->op_flags |= (OPf_WANT_LIST | OPf_REF); } PL_hints |= HINT_BLOCK_SCOPE; pm = (PMOP*)o; assert(floor==0 || (pm->op_pmflags & PMf_HAS_CV)); if (is_compiletime) { U32 rx_flags = pm->op_pmflags & RXf_PMf_COMPILETIME; regexp_engine const *eng = current_re_engine(); if (is_split) { /* make engine handle split ' ' specially */ pm->op_pmflags |= PMf_SPLIT; rx_flags |= RXf_SPLIT; } /* Skip compiling if parser found an error for this pattern */ if (pm->op_pmflags & PMf_HAS_ERROR) { return o; } if (!has_code || !eng->op_comp) { /* compile-time simple constant pattern */ if ((pm->op_pmflags & PMf_HAS_CV) && !has_code) { /* whoops! we guessed that a qr// had a code block, but we * were wrong (e.g. /[(?{}]/ ). Throw away the PL_compcv * that isn't required now. Note that we have to be pretty * confident that nothing used that CV's pad while the * regex was parsed, except maybe op targets for \Q etc. * If there were any op targets, though, they should have * been stolen by constant folding. */ #ifdef DEBUGGING SSize_t i = 0; assert(PadnamelistMAXNAMED(PL_comppad_name) == 0); while (++i <= AvFILLp(PL_comppad)) { # ifdef USE_PAD_RESET /* under USE_PAD_RESET, pad swipe replaces a swiped * folded constant with a fresh padtmp */ assert(!PL_curpad[i] || SvPADTMP(PL_curpad[i])); # else assert(!PL_curpad[i]); # endif } #endif /* But we know that one op is using this CV's slab. */ cv_forget_slab(PL_compcv); LEAVE_SCOPE(floor); pm->op_pmflags &= ~PMf_HAS_CV; } PM_SETRE(pm, eng->op_comp ? eng->op_comp(aTHX_ NULL, 0, expr, eng, NULL, NULL, rx_flags, pm->op_pmflags) : Perl_re_op_compile(aTHX_ NULL, 0, expr, eng, NULL, NULL, rx_flags, pm->op_pmflags) ); op_free(expr); } else { /* compile-time pattern that includes literal code blocks */ REGEXP* re = eng->op_comp(aTHX_ NULL, 0, expr, eng, NULL, NULL, rx_flags, (pm->op_pmflags | ((PL_hints & HINT_RE_EVAL) ? PMf_USE_RE_EVAL : 0)) ); PM_SETRE(pm, re); if (pm->op_pmflags & PMf_HAS_CV) { CV *cv; /* this QR op (and the anon sub we embed it in) is never * actually executed. It's just a placeholder where we can * squirrel away expr in op_code_list without the peephole * optimiser etc processing it for a second time */ OP *qr = newPMOP(OP_QR, 0); ((PMOP*)qr)->op_code_list = expr; /* handle the implicit sub{} wrapped round the qr/(?{..})/ */ SvREFCNT_inc_simple_void(PL_compcv); cv = newATTRSUB(floor, 0, NULL, NULL, qr); ReANY(re)->qr_anoncv = cv; /* attach the anon CV to the pad so that * pad_fixup_inner_anons() can find it */ (void)pad_add_anon(cv, o->op_type); SvREFCNT_inc_simple_void(cv); } else { pm->op_code_list = expr; } } } else { /* runtime pattern: build chain of regcomp etc ops */ bool reglist; PADOFFSET cv_targ = 0; reglist = isreg && expr->op_type == OP_LIST; if (reglist) op_null(expr); if (has_code) { pm->op_code_list = expr; /* don't free op_code_list; its ops are embedded elsewhere too */ pm->op_pmflags |= PMf_CODELIST_PRIVATE; } if (is_split) /* make engine handle split ' ' specially */ pm->op_pmflags |= PMf_SPLIT; /* the OP_REGCMAYBE is a placeholder in the non-threaded case * to allow its op_next to be pointed past the regcomp and * preceding stacking ops; * OP_REGCRESET is there to reset taint before executing the * stacking ops */ if (pm->op_pmflags & PMf_KEEP || TAINTING_get) expr = newUNOP((TAINTING_get ? OP_REGCRESET : OP_REGCMAYBE),0,expr); if (pm->op_pmflags & PMf_HAS_CV) { /* we have a runtime qr with literal code. This means * that the qr// has been wrapped in a new CV, which * means that runtime consts, vars etc will have been compiled * against a new pad. So... we need to execute those ops * within the environment of the new CV. So wrap them in a call * to a new anon sub. i.e. for * * qr/a$b(?{...})/, * * we build an anon sub that looks like * * sub { "a", $b, '(?{...})' } * * and call it, passing the returned list to regcomp. * Or to put it another way, the list of ops that get executed * are: * * normal PMf_HAS_CV * ------ ------------------- * pushmark (for regcomp) * pushmark (for entersub) * anoncode * srefgen * entersub * regcreset regcreset * pushmark pushmark * const("a") const("a") * gvsv(b) gvsv(b) * const("(?{...})") const("(?{...})") * leavesub * regcomp regcomp */ SvREFCNT_inc_simple_void(PL_compcv); CvLVALUE_on(PL_compcv); /* these lines are just an unrolled newANONATTRSUB */ expr = newSVOP(OP_ANONCODE, 0, MUTABLE_SV(newATTRSUB(floor, 0, NULL, NULL, expr))); cv_targ = expr->op_targ; expr = newUNOP(OP_REFGEN, 0, expr); expr = list(force_list(newUNOP(OP_ENTERSUB, 0, scalar(expr)), 1)); } rcop = alloc_LOGOP(OP_REGCOMP, scalar(expr), o); rcop->op_flags |= ((PL_hints & HINT_RE_EVAL) ? OPf_SPECIAL : 0) | (reglist ? OPf_STACKED : 0); rcop->op_targ = cv_targ; /* /$x/ may cause an eval, since $x might be qr/(?{..})/ */ if (PL_hints & HINT_RE_EVAL) S_set_haseval(aTHX); /* establish postfix order */ if (expr->op_type == OP_REGCRESET || expr->op_type == OP_REGCMAYBE) { LINKLIST(expr); rcop->op_next = expr; ((UNOP*)expr)->op_first->op_next = (OP*)rcop; } else { rcop->op_next = LINKLIST(expr); expr->op_next = (OP*)rcop; } op_prepend_elem(o->op_type, scalar((OP*)rcop), o); } if (repl) { OP *curop = repl; bool konst; /* If we are looking at s//.../e with a single statement, get past the implicit do{}. */ if (curop->op_type == OP_NULL && curop->op_flags & OPf_KIDS && cUNOPx(curop)->op_first->op_type == OP_SCOPE && cUNOPx(curop)->op_first->op_flags & OPf_KIDS) { OP *sib; OP *kid = cUNOPx(cUNOPx(curop)->op_first)->op_first; if (kid->op_type == OP_NULL && (sib = OpSIBLING(kid)) && !OpHAS_SIBLING(sib)) curop = sib; } if (curop->op_type == OP_CONST) konst = TRUE; else if (( (curop->op_type == OP_RV2SV || curop->op_type == OP_RV2AV || curop->op_type == OP_RV2HV || curop->op_type == OP_RV2GV) && cUNOPx(curop)->op_first && cUNOPx(curop)->op_first->op_type == OP_GV ) || curop->op_type == OP_PADSV || curop->op_type == OP_PADAV || curop->op_type == OP_PADHV || curop->op_type == OP_PADANY) { repl_has_vars = 1; konst = TRUE; } else konst = FALSE; if (konst && !(repl_has_vars && (!PM_GETRE(pm) || !RX_PRELEN(PM_GETRE(pm)) || RX_EXTFLAGS(PM_GETRE(pm)) & RXf_EVAL_SEEN))) { pm->op_pmflags |= PMf_CONST; /* const for long enough */ op_prepend_elem(o->op_type, scalar(repl), o); } else { rcop = alloc_LOGOP(OP_SUBSTCONT, scalar(repl), o); rcop->op_private = 1; /* establish postfix order */ rcop->op_next = LINKLIST(repl); repl->op_next = (OP*)rcop; pm->op_pmreplrootu.op_pmreplroot = scalar((OP*)rcop); assert(!(pm->op_pmflags & PMf_ONCE)); pm->op_pmstashstartu.op_pmreplstart = LINKLIST(rcop); rcop->op_next = 0; } } return (OP*)pm; } /* =for apidoc Am|OP *|newSVOP|I32 type|I32 flags|SV *sv Constructs, checks, and returns an op of any type that involves an embedded SV. C is the opcode. C gives the eight bits of C. C gives the SV to embed in the op; this function takes ownership of one reference to it. =cut */ OP * Perl_newSVOP(pTHX_ I32 type, I32 flags, SV *sv) { dVAR; SVOP *svop; PERL_ARGS_ASSERT_NEWSVOP; assert((PL_opargs[type] & OA_CLASS_MASK) == OA_SVOP || (PL_opargs[type] & OA_CLASS_MASK) == OA_PVOP_OR_SVOP || (PL_opargs[type] & OA_CLASS_MASK) == OA_FILESTATOP || type == OP_CUSTOM); NewOp(1101, svop, 1, SVOP); OpTYPE_set(svop, type); svop->op_sv = sv; svop->op_next = (OP*)svop; svop->op_flags = (U8)flags; svop->op_private = (U8)(0 | (flags >> 8)); if (PL_opargs[type] & OA_RETSCALAR) scalar((OP*)svop); if (PL_opargs[type] & OA_TARGET) svop->op_targ = pad_alloc(type, SVs_PADTMP); return CHECKOP(type, svop); } /* =for apidoc Am|OP *|newDEFSVOP| Constructs and returns an op to access C<$_>. =cut */ OP * Perl_newDEFSVOP(pTHX) { return newSVREF(newGVOP(OP_GV, 0, PL_defgv)); } #ifdef USE_ITHREADS /* =for apidoc Am|OP *|newPADOP|I32 type|I32 flags|SV *sv Constructs, checks, and returns an op of any type that involves a reference to a pad element. C is the opcode. C gives the eight bits of C. A pad slot is automatically allocated, and is populated with C; this function takes ownership of one reference to it. This function only exists if Perl has been compiled to use ithreads. =cut */ OP * Perl_newPADOP(pTHX_ I32 type, I32 flags, SV *sv) { dVAR; PADOP *padop; PERL_ARGS_ASSERT_NEWPADOP; assert((PL_opargs[type] & OA_CLASS_MASK) == OA_SVOP || (PL_opargs[type] & OA_CLASS_MASK) == OA_PVOP_OR_SVOP || (PL_opargs[type] & OA_CLASS_MASK) == OA_FILESTATOP || type == OP_CUSTOM); NewOp(1101, padop, 1, PADOP); OpTYPE_set(padop, type); padop->op_padix = pad_alloc(type, isGV(sv) ? SVf_READONLY : SVs_PADTMP); SvREFCNT_dec(PAD_SVl(padop->op_padix)); PAD_SETSV(padop->op_padix, sv); assert(sv); padop->op_next = (OP*)padop; padop->op_flags = (U8)flags; if (PL_opargs[type] & OA_RETSCALAR) scalar((OP*)padop); if (PL_opargs[type] & OA_TARGET) padop->op_targ = pad_alloc(type, SVs_PADTMP); return CHECKOP(type, padop); } #endif /* USE_ITHREADS */ /* =for apidoc Am|OP *|newGVOP|I32 type|I32 flags|GV *gv Constructs, checks, and returns an op of any type that involves an embedded reference to a GV. C is the opcode. C gives the eight bits of C. C identifies the GV that the op should reference; calling this function does not transfer ownership of any reference to it. =cut */ OP * Perl_newGVOP(pTHX_ I32 type, I32 flags, GV *gv) { PERL_ARGS_ASSERT_NEWGVOP; #ifdef USE_ITHREADS return newPADOP(type, flags, SvREFCNT_inc_simple_NN(gv)); #else return newSVOP(type, flags, SvREFCNT_inc_simple_NN(gv)); #endif } /* =for apidoc Am|OP *|newPVOP|I32 type|I32 flags|char *pv Constructs, checks, and returns an op of any type that involves an embedded C-level pointer (PV). C is the opcode. C gives the eight bits of C. C supplies the C-level pointer. Depending on the op type, the memory referenced by C may be freed when the op is destroyed. If the op is of a freeing type, C must have been allocated using C. =cut */ OP * Perl_newPVOP(pTHX_ I32 type, I32 flags, char *pv) { dVAR; const bool utf8 = cBOOL(flags & SVf_UTF8); PVOP *pvop; flags &= ~SVf_UTF8; assert((PL_opargs[type] & OA_CLASS_MASK) == OA_PVOP_OR_SVOP || type == OP_RUNCV || type == OP_CUSTOM || (PL_opargs[type] & OA_CLASS_MASK) == OA_LOOPEXOP); NewOp(1101, pvop, 1, PVOP); OpTYPE_set(pvop, type); pvop->op_pv = pv; pvop->op_next = (OP*)pvop; pvop->op_flags = (U8)flags; pvop->op_private = utf8 ? OPpPV_IS_UTF8 : 0; if (PL_opargs[type] & OA_RETSCALAR) scalar((OP*)pvop); if (PL_opargs[type] & OA_TARGET) pvop->op_targ = pad_alloc(type, SVs_PADTMP); return CHECKOP(type, pvop); } void Perl_package(pTHX_ OP *o) { SV *const sv = cSVOPo->op_sv; PERL_ARGS_ASSERT_PACKAGE; SAVEGENERICSV(PL_curstash); save_item(PL_curstname); PL_curstash = (HV *)SvREFCNT_inc(gv_stashsv(sv, GV_ADD)); sv_setsv(PL_curstname, sv); PL_hints |= HINT_BLOCK_SCOPE; PL_parser->copline = NOLINE; op_free(o); } void Perl_package_version( pTHX_ OP *v ) { U32 savehints = PL_hints; PERL_ARGS_ASSERT_PACKAGE_VERSION; PL_hints &= ~HINT_STRICT_VARS; sv_setsv( GvSV(gv_fetchpvs("VERSION", GV_ADDMULTI, SVt_PV)), cSVOPx(v)->op_sv ); PL_hints = savehints; op_free(v); } void Perl_utilize(pTHX_ int aver, I32 floor, OP *version, OP *idop, OP *arg) { OP *pack; OP *imop; OP *veop; SV *use_version = NULL; PERL_ARGS_ASSERT_UTILIZE; if (idop->op_type != OP_CONST) Perl_croak(aTHX_ "Module name must be constant"); veop = NULL; if (version) { SV * const vesv = ((SVOP*)version)->op_sv; if (!arg && !SvNIOKp(vesv)) { arg = version; } else { OP *pack; SV *meth; if (version->op_type != OP_CONST || !SvNIOKp(vesv)) Perl_croak(aTHX_ "Version number must be a constant number"); /* Make copy of idop so we don't free it twice */ pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)idop)->op_sv)); /* Fake up a method call to VERSION */ meth = newSVpvs_share("VERSION"); veop = op_convert_list(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL, op_append_elem(OP_LIST, op_prepend_elem(OP_LIST, pack, version), newMETHOP_named(OP_METHOD_NAMED, 0, meth))); } } /* Fake up an import/unimport */ if (arg && arg->op_type == OP_STUB) { imop = arg; /* no import on explicit () */ } else if (SvNIOKp(((SVOP*)idop)->op_sv)) { imop = NULL; /* use 5.0; */ if (aver) use_version = ((SVOP*)idop)->op_sv; else idop->op_private |= OPpCONST_NOVER; } else { SV *meth; /* Make copy of idop so we don't free it twice */ pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)idop)->op_sv)); /* Fake up a method call to import/unimport */ meth = aver ? newSVpvs_share("import") : newSVpvs_share("unimport"); imop = op_convert_list(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL, op_append_elem(OP_LIST, op_prepend_elem(OP_LIST, pack, arg), newMETHOP_named(OP_METHOD_NAMED, 0, meth) )); } /* Fake up the BEGIN {}, which does its thing immediately. */ newATTRSUB(floor, newSVOP(OP_CONST, 0, newSVpvs_share("BEGIN")), NULL, NULL, op_append_elem(OP_LINESEQ, op_append_elem(OP_LINESEQ, newSTATEOP(0, NULL, newUNOP(OP_REQUIRE, 0, idop)), newSTATEOP(0, NULL, veop)), newSTATEOP(0, NULL, imop) )); if (use_version) { /* Enable the * feature bundle that corresponds to the required version. */ use_version = sv_2mortal(new_version(use_version)); S_enable_feature_bundle(aTHX_ use_version); /* If a version >= 5.11.0 is requested, strictures are on by default! */ if (vcmp(use_version, sv_2mortal(upg_version(newSVnv(5.011000), FALSE))) >= 0) { if (!(PL_hints & HINT_EXPLICIT_STRICT_REFS)) PL_hints |= HINT_STRICT_REFS; if (!(PL_hints & HINT_EXPLICIT_STRICT_SUBS)) PL_hints |= HINT_STRICT_SUBS; if (!(PL_hints & HINT_EXPLICIT_STRICT_VARS)) PL_hints |= HINT_STRICT_VARS; } /* otherwise they are off */ else { if (!(PL_hints & HINT_EXPLICIT_STRICT_REFS)) PL_hints &= ~HINT_STRICT_REFS; if (!(PL_hints & HINT_EXPLICIT_STRICT_SUBS)) PL_hints &= ~HINT_STRICT_SUBS; if (!(PL_hints & HINT_EXPLICIT_STRICT_VARS)) PL_hints &= ~HINT_STRICT_VARS; } } /* The "did you use incorrect case?" warning used to be here. * The problem is that on case-insensitive filesystems one * might get false positives for "use" (and "require"): * "use Strict" or "require CARP" will work. This causes * portability problems for the script: in case-strict * filesystems the script will stop working. * * The "incorrect case" warning checked whether "use Foo" * imported "Foo" to your namespace, but that is wrong, too: * there is no requirement nor promise in the language that * a Foo.pm should or would contain anything in package "Foo". * * There is very little Configure-wise that can be done, either: * the case-sensitivity of the build filesystem of Perl does not * help in guessing the case-sensitivity of the runtime environment. */ PL_hints |= HINT_BLOCK_SCOPE; PL_parser->copline = NOLINE; COP_SEQMAX_INC; /* Purely for B::*'s benefit */ } /* =head1 Embedding Functions =for apidoc load_module Loads the module whose name is pointed to by the string part of C. Note that the actual module name, not its filename, should be given. Eg, "Foo::Bar" instead of "Foo/Bar.pm". ver, if specified and not NULL, provides version semantics similar to C. The optional trailing arguments can be used to specify arguments to the module's C method, similar to C; their precise handling depends on the flags. The flags argument is a bitwise-ORed collection of any of C, C, or C (or 0 for no flags). If C is set, the module is loaded as if with an empty import list, as in C; this is the only circumstance in which the trailing optional arguments may be omitted entirely. Otherwise, if C is set, the trailing arguments must consist of exactly one C, containing the op tree that produces the relevant import arguments. Otherwise, the trailing arguments must all be C values that will be used as import arguments; and the list must be terminated with C<(SV*) NULL>. If neither C nor C is set, the trailing C pointer is needed even if no import arguments are desired. The reference count for each specified C argument is decremented. In addition, the C argument is modified. If C is set, the module is loaded as if with C rather than C. =cut */ void Perl_load_module(pTHX_ U32 flags, SV *name, SV *ver, ...) { va_list args; PERL_ARGS_ASSERT_LOAD_MODULE; va_start(args, ver); vload_module(flags, name, ver, &args); va_end(args); } #ifdef PERL_IMPLICIT_CONTEXT void Perl_load_module_nocontext(U32 flags, SV *name, SV *ver, ...) { dTHX; va_list args; PERL_ARGS_ASSERT_LOAD_MODULE_NOCONTEXT; va_start(args, ver); vload_module(flags, name, ver, &args); va_end(args); } #endif void Perl_vload_module(pTHX_ U32 flags, SV *name, SV *ver, va_list *args) { OP *veop, *imop; OP * const modname = newSVOP(OP_CONST, 0, name); PERL_ARGS_ASSERT_VLOAD_MODULE; modname->op_private |= OPpCONST_BARE; if (ver) { veop = newSVOP(OP_CONST, 0, ver); } else veop = NULL; if (flags & PERL_LOADMOD_NOIMPORT) { imop = sawparens(newNULLLIST()); } else if (flags & PERL_LOADMOD_IMPORT_OPS) { imop = va_arg(*args, OP*); } else { SV *sv; imop = NULL; sv = va_arg(*args, SV*); while (sv) { imop = op_append_elem(OP_LIST, imop, newSVOP(OP_CONST, 0, sv)); sv = va_arg(*args, SV*); } } /* utilize() fakes up a BEGIN { require ..; import ... }, so make sure * that it has a PL_parser to play with while doing that, and also * that it doesn't mess with any existing parser, by creating a tmp * new parser with lex_start(). This won't actually be used for much, * since pp_require() will create another parser for the real work. * The ENTER/LEAVE pair protect callers from any side effects of use. */ ENTER; SAVEVPTR(PL_curcop); lex_start(NULL, NULL, LEX_START_SAME_FILTER); utilize(!(flags & PERL_LOADMOD_DENY), start_subparse(FALSE, 0), veop, modname, imop); LEAVE; } PERL_STATIC_INLINE OP * S_new_entersubop(pTHX_ GV *gv, OP *arg) { return newUNOP(OP_ENTERSUB, OPf_STACKED, newLISTOP(OP_LIST, 0, arg, newUNOP(OP_RV2CV, 0, newGVOP(OP_GV, 0, gv)))); } OP * Perl_dofile(pTHX_ OP *term, I32 force_builtin) { OP *doop; GV *gv; PERL_ARGS_ASSERT_DOFILE; if (!force_builtin && (gv = gv_override("do", 2))) { doop = S_new_entersubop(aTHX_ gv, term); } else { doop = newUNOP(OP_DOFILE, 0, scalar(term)); } return doop; } /* =head1 Optree construction =for apidoc Am|OP *|newSLICEOP|I32 flags|OP *subscript|OP *listval Constructs, checks, and returns an C (list slice) op. C gives the eight bits of C, except that C will be set automatically, and, shifted up eight bits, the eight bits of C, except that the bit with value 1 or 2 is automatically set as required. C and C supply the parameters of the slice; they are consumed by this function and become part of the constructed op tree. =cut */ OP * Perl_newSLICEOP(pTHX_ I32 flags, OP *subscript, OP *listval) { return newBINOP(OP_LSLICE, flags, list(force_list(subscript, 1)), list(force_list(listval, 1)) ); } #define ASSIGN_LIST 1 #define ASSIGN_REF 2 STATIC I32 S_assignment_type(pTHX_ const OP *o) { unsigned type; U8 flags; U8 ret; if (!o) return TRUE; if ((o->op_type == OP_NULL) && (o->op_flags & OPf_KIDS)) o = cUNOPo->op_first; flags = o->op_flags; type = o->op_type; if (type == OP_COND_EXPR) { OP * const sib = OpSIBLING(cLOGOPo->op_first); const I32 t = assignment_type(sib); const I32 f = assignment_type(OpSIBLING(sib)); if (t == ASSIGN_LIST && f == ASSIGN_LIST) return ASSIGN_LIST; if ((t == ASSIGN_LIST) ^ (f == ASSIGN_LIST)) yyerror("Assignment to both a list and a scalar"); return FALSE; } if (type == OP_SREFGEN) { OP * const kid = cUNOPx(cUNOPo->op_first)->op_first; type = kid->op_type; flags |= kid->op_flags; if (!(flags & OPf_PARENS) && (kid->op_type == OP_RV2AV || kid->op_type == OP_PADAV || kid->op_type == OP_RV2HV || kid->op_type == OP_PADHV )) return ASSIGN_REF; ret = ASSIGN_REF; } else ret = 0; if (type == OP_LIST && (flags & OPf_WANT) == OPf_WANT_SCALAR && o->op_private & OPpLVAL_INTRO) return ret; if (type == OP_LIST || flags & OPf_PARENS || type == OP_RV2AV || type == OP_RV2HV || type == OP_ASLICE || type == OP_HSLICE || type == OP_KVASLICE || type == OP_KVHSLICE || type == OP_REFGEN) return TRUE; if (type == OP_PADAV || type == OP_PADHV) return TRUE; if (type == OP_RV2SV) return ret; return ret; } static OP * S_newONCEOP(pTHX_ OP *initop, OP *padop) { const PADOFFSET target = padop->op_targ; OP *const other = newOP(OP_PADSV, padop->op_flags | ((padop->op_private & ~OPpLVAL_INTRO) << 8)); OP *const first = newOP(OP_NULL, 0); OP *const nullop = newCONDOP(0, first, initop, other); /* XXX targlex disabled for now; see ticket #124160 newCONDOP(0, first, S_maybe_targlex(aTHX_ initop), other); */ OP *const condop = first->op_next; OpTYPE_set(condop, OP_ONCE); other->op_targ = target; nullop->op_flags |= OPf_WANT_SCALAR; /* Store the initializedness of state vars in a separate pad entry. */ condop->op_targ = pad_add_name_pvn("$",1,padadd_NO_DUP_CHECK|padadd_STATE,0,0); /* hijacking PADSTALE for uninitialized state variables */ SvPADSTALE_on(PAD_SVl(condop->op_targ)); return nullop; } /* =for apidoc Am|OP *|newASSIGNOP|I32 flags|OP *left|I32 optype|OP *right Constructs, checks, and returns an assignment op. C and C supply the parameters of the assignment; they are consumed by this function and become part of the constructed op tree. If C is C, C, or C, then a suitable conditional optree is constructed. If C is the opcode of a binary operator, such as C, then an op is constructed that performs the binary operation and assigns the result to the left argument. Either way, if C is non-zero then C has no effect. If C is zero, then a plain scalar or list assignment is constructed. Which type of assignment it is is automatically determined. C gives the eight bits of C, except that C will be set automatically, and, shifted up eight bits, the eight bits of C, except that the bit with value 1 or 2 is automatically set as required. =cut */ OP * Perl_newASSIGNOP(pTHX_ I32 flags, OP *left, I32 optype, OP *right) { OP *o; I32 assign_type; if (optype) { if (optype == OP_ANDASSIGN || optype == OP_ORASSIGN || optype == OP_DORASSIGN) { right = scalar(right); return newLOGOP(optype, 0, op_lvalue(scalar(left), optype), newBINOP(OP_SASSIGN, OPpASSIGN_BACKWARDS<<8, right, right)); } else { return newBINOP(optype, OPf_STACKED, op_lvalue(scalar(left), optype), scalar(right)); } } if ((assign_type = assignment_type(left)) == ASSIGN_LIST) { OP *state_var_op = NULL; static const char no_list_state[] = "Initialization of state variables" " in list currently forbidden"; OP *curop; if (left->op_type == OP_ASLICE || left->op_type == OP_HSLICE) left->op_private &= ~ OPpSLICEWARNING; PL_modcount = 0; left = op_lvalue(left, OP_AASSIGN); curop = list(force_list(left, 1)); o = newBINOP(OP_AASSIGN, flags, list(force_list(right, 1)), curop); o->op_private = (U8)(0 | (flags >> 8)); if (OP_TYPE_IS_OR_WAS(left, OP_LIST)) { OP *lop = ((LISTOP*)left)->op_first, *vop, *eop; if (!(left->op_flags & OPf_PARENS) && lop->op_type == OP_PUSHMARK && (vop = OpSIBLING(lop)) && (vop->op_type == OP_PADAV || vop->op_type == OP_PADHV) && !(vop->op_flags & OPf_PARENS) && (vop->op_private & (OPpLVAL_INTRO|OPpPAD_STATE)) == (OPpLVAL_INTRO|OPpPAD_STATE) && (eop = OpSIBLING(vop)) && eop->op_type == OP_ENTERSUB && !OpHAS_SIBLING(eop)) { state_var_op = vop; } else { while (lop) { if ((lop->op_type == OP_PADSV || lop->op_type == OP_PADAV || lop->op_type == OP_PADHV || lop->op_type == OP_PADANY) && (lop->op_private & OPpPAD_STATE) ) yyerror(no_list_state); lop = OpSIBLING(lop); } } } else if ( (left->op_private & OPpLVAL_INTRO) && (left->op_private & OPpPAD_STATE) && ( left->op_type == OP_PADSV || left->op_type == OP_PADAV || left->op_type == OP_PADHV || left->op_type == OP_PADANY) ) { /* All single variable list context state assignments, hence state ($a) = ... (state $a) = ... state @a = ... state (@a) = ... (state @a) = ... state %a = ... state (%a) = ... (state %a) = ... */ if (left->op_flags & OPf_PARENS) yyerror(no_list_state); else state_var_op = left; } /* optimise @a = split(...) into: * @{expr}: split(..., @{expr}) (where @a is not flattened) * @a, my @a, local @a: split(...) (where @a is attached to * the split op itself) */ if ( right && right->op_type == OP_SPLIT /* don't do twice, e.g. @b = (@a = split) */ && !(right->op_private & OPpSPLIT_ASSIGN)) { OP *gvop = NULL; if ( ( left->op_type == OP_RV2AV && (gvop=((UNOP*)left)->op_first)->op_type==OP_GV) || left->op_type == OP_PADAV) { /* @pkg or @lex or local @pkg' or 'my @lex' */ OP *tmpop; if (gvop) { #ifdef USE_ITHREADS ((PMOP*)right)->op_pmreplrootu.op_pmtargetoff = cPADOPx(gvop)->op_padix; cPADOPx(gvop)->op_padix = 0; /* steal it */ #else ((PMOP*)right)->op_pmreplrootu.op_pmtargetgv = MUTABLE_GV(cSVOPx(gvop)->op_sv); cSVOPx(gvop)->op_sv = NULL; /* steal it */ #endif right->op_private |= left->op_private & OPpOUR_INTRO; } else { ((PMOP*)right)->op_pmreplrootu.op_pmtargetoff = left->op_targ; left->op_targ = 0; /* steal it */ right->op_private |= OPpSPLIT_LEX; } right->op_private |= left->op_private & OPpLVAL_INTRO; detach_split: tmpop = cUNOPo->op_first; /* to list (nulled) */ tmpop = ((UNOP*)tmpop)->op_first; /* to pushmark */ assert(OpSIBLING(tmpop) == right); assert(!OpHAS_SIBLING(right)); /* detach the split subtreee from the o tree, * then free the residual o tree */ op_sibling_splice(cUNOPo->op_first, tmpop, 1, NULL); op_free(o); /* blow off assign */ right->op_private |= OPpSPLIT_ASSIGN; right->op_flags &= ~OPf_WANT; /* "I don't know and I don't care." */ return right; } else if (left->op_type == OP_RV2AV) { /* @{expr} */ OP *pushop = cUNOPx(cBINOPo->op_last)->op_first; assert(OpSIBLING(pushop) == left); /* Detach the array ... */ op_sibling_splice(cBINOPo->op_last, pushop, 1, NULL); /* ... and attach it to the split. */ op_sibling_splice(right, cLISTOPx(right)->op_last, 0, left); right->op_flags |= OPf_STACKED; /* Detach split and expunge aassign as above. */ goto detach_split; } else if (PL_modcount < RETURN_UNLIMITED_NUMBER && ((LISTOP*)right)->op_last->op_type == OP_CONST) { /* convert split(...,0) to split(..., PL_modcount+1) */ SV ** const svp = &((SVOP*)((LISTOP*)right)->op_last)->op_sv; SV * const sv = *svp; if (SvIOK(sv) && SvIVX(sv) == 0) { if (right->op_private & OPpSPLIT_IMPLIM) { /* our own SV, created in ck_split */ SvREADONLY_off(sv); sv_setiv(sv, PL_modcount+1); } else { /* SV may belong to someone else */ SvREFCNT_dec(sv); *svp = newSViv(PL_modcount+1); } } } } if (state_var_op) o = S_newONCEOP(aTHX_ o, state_var_op); return o; } if (assign_type == ASSIGN_REF) return newBINOP(OP_REFASSIGN, flags, scalar(right), left); if (!right) right = newOP(OP_UNDEF, 0); if (right->op_type == OP_READLINE) { right->op_flags |= OPf_STACKED; return newBINOP(OP_NULL, flags, op_lvalue(scalar(left), OP_SASSIGN), scalar(right)); } else { o = newBINOP(OP_SASSIGN, flags, scalar(right), op_lvalue(scalar(left), OP_SASSIGN) ); } return o; } /* =for apidoc Am|OP *|newSTATEOP|I32 flags|char *label|OP *o Constructs a state op (COP). The state op is normally a C op, but will be a C op if debugging is enabled for currently-compiled code. The state op is populated from C (or C). If C