summaryrefslogtreecommitdiff
path: root/scope.h
blob: afdaf751891a331d36a4c9653c8f49c19748f2e3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
/*    scope.h
 *
 *    Copyright (C) 1993, 1994, 1996, 1997, 1998, 1999, 2000, 2001,
 *    2002, 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.
 *
 */

/* *** Update arg_counts[] in scope.c if you modify these */

/* zero args */

#define SAVEt_ALLOC		0
#define SAVEt_CLEARPADRANGE	1
#define SAVEt_CLEARSV		2
#define SAVEt_REGCONTEXT	3

/* one arg */

#define SAVEt_TMPSFLOOR		4
#define SAVEt_BOOL		5
#define SAVEt_COMPILE_WARNINGS	6
#define SAVEt_COMPPAD		7
#define SAVEt_FREECOPHH		8
#define SAVEt_FREEOP		9
#define SAVEt_FREEPV		10
#define SAVEt_FREESV		11
#define SAVEt_I16		12
#define SAVEt_I32_SMALL		13
#define SAVEt_I8		14
#define SAVEt_INT_SMALL		15
#define SAVEt_MORTALIZESV	16
#define SAVEt_NSTAB		17
#define SAVEt_OP		18
#define SAVEt_PARSER		19
#define SAVEt_STACK_POS		20
#define SAVEt_READONLY_OFF	21
#define SAVEt_FREEPADNAME	22
#define SAVEt_STRLEN_SMALL      23

/* two args */

#define SAVEt_AV		24
#define SAVEt_DESTRUCTOR	25
#define SAVEt_DESTRUCTOR_X	26
#define SAVEt_GENERIC_PVREF	27
#define SAVEt_GENERIC_SVREF	28
#define SAVEt_GP		29
#define SAVEt_GVSV		30
#define SAVEt_HINTS		31
#define SAVEt_HPTR		32
#define SAVEt_HV		33
#define SAVEt_I32		34
#define SAVEt_INT		35
#define SAVEt_ITEM		36
#define SAVEt_IV		37
#define SAVEt_LONG		38
#define SAVEt_PPTR		39
#define SAVEt_SAVESWITCHSTACK	40
#define SAVEt_SHARED_PVREF	41
#define SAVEt_SPTR		42
#define SAVEt_STRLEN		43
#define SAVEt_SV		44
#define SAVEt_SVREF		45
#define SAVEt_VPTR		46
#define SAVEt_ADELETE		47
#define SAVEt_APTR		48

/* three args */

#define SAVEt_HELEM		49
#define SAVEt_PADSV_AND_MORTALIZE 50
#define SAVEt_SET_SVFLAGS	51
#define SAVEt_GVSLOT		52
#define SAVEt_AELEM		53
#define SAVEt_DELETE		54
#define SAVEt_HINTS_HH		55


#define SAVEf_SETMAGIC		1
#define SAVEf_KEEPOLDELEM	2

#define SAVE_TIGHT_SHIFT	6
#define SAVE_MASK		0x3F

#define save_aelem(av,idx,sptr)	save_aelem_flags(av,idx,sptr,SAVEf_SETMAGIC)
#define save_helem(hv,key,sptr)	save_helem_flags(hv,key,sptr,SAVEf_SETMAGIC)

#ifndef SCOPE_SAVES_SIGNAL_MASK
#define SCOPE_SAVES_SIGNAL_MASK 0
#endif

/* the maximum number of entries that might be pushed using the SS_ADD*
 * macros */
#define SS_MAXPUSH 4

#define SSCHECK(need) if (UNLIKELY(PL_savestack_ix + (I32)(need) > PL_savestack_max)) savestack_grow()
#define SSGROW(need) if (UNLIKELY(PL_savestack_ix + (I32)(need) > PL_savestack_max)) savestack_grow_cnt(need)
#define SSPUSHINT(i) (PL_savestack[PL_savestack_ix++].any_i32 = (I32)(i))
#define SSPUSHLONG(i) (PL_savestack[PL_savestack_ix++].any_long = (long)(i))
#define SSPUSHBOOL(p) (PL_savestack[PL_savestack_ix++].any_bool = (p))
#define SSPUSHIV(i) (PL_savestack[PL_savestack_ix++].any_iv = (IV)(i))
#define SSPUSHUV(u) (PL_savestack[PL_savestack_ix++].any_uv = (UV)(u))
#define SSPUSHPTR(p) (PL_savestack[PL_savestack_ix++].any_ptr = (void*)(p))
#define SSPUSHDPTR(p) (PL_savestack[PL_savestack_ix++].any_dptr = (p))
#define SSPUSHDXPTR(p) (PL_savestack[PL_savestack_ix++].any_dxptr = (p))

/* SS_ADD*: newer, faster versions of the above. Don't mix the two sets of
 * macros. These are fast because they save reduce accesses to the PL_
 * vars and move the size check to the end. Doing the check last means
 * that values in registers will have been pushed and no longer needed, so
 * don't need saving around the call to grow. Also, tail-call elimination
 * of the grow() can be done. These changes reduce the code of something
 * like save_pushptrptr() to half its former size.
 * Of course, doing the size check *after* pushing means we must always
 * ensure there are SS_MAXPUSH free slots on the savestack. This is ensured by
 * savestack_grow() and savestack_grow_cnt always allocating SS_MAXPUSH slots
 * more than asked for, or that it sets PL_savestack_max to
 *
 * These are for internal core use only and are subject to change */

#define dSS_ADD \
    I32 ix = PL_savestack_ix;     \
    ANY *ssp = &PL_savestack[ix]

#define SS_ADD_END(need) \
    assert((need) <= SS_MAXPUSH);                               \
    ix += (need);                                               \
    PL_savestack_ix = ix;                                       \
    assert(ix <= PL_savestack_max + SS_MAXPUSH);                \
    if (UNLIKELY(ix > PL_savestack_max)) savestack_grow();      \
    assert(PL_savestack_ix <= PL_savestack_max);

#define SS_ADD_INT(i)   ((ssp++)->any_i32 = (I32)(i))
#define SS_ADD_LONG(i)  ((ssp++)->any_long = (long)(i))
#define SS_ADD_BOOL(p)  ((ssp++)->any_bool = (p))
#define SS_ADD_IV(i)    ((ssp++)->any_iv = (IV)(i))
#define SS_ADD_UV(u)    ((ssp++)->any_uv = (UV)(u))
#define SS_ADD_PTR(p)   ((ssp++)->any_ptr = (void*)(p))
#define SS_ADD_DPTR(p)  ((ssp++)->any_dptr = (p))
#define SS_ADD_DXPTR(p) ((ssp++)->any_dxptr = (p))

#define SSPOPINT (PL_savestack[--PL_savestack_ix].any_i32)
#define SSPOPLONG (PL_savestack[--PL_savestack_ix].any_long)
#define SSPOPBOOL (PL_savestack[--PL_savestack_ix].any_bool)
#define SSPOPIV (PL_savestack[--PL_savestack_ix].any_iv)
#define SSPOPUV (PL_savestack[--PL_savestack_ix].any_uv)
#define SSPOPPTR (PL_savestack[--PL_savestack_ix].any_ptr)
#define SSPOPDPTR (PL_savestack[--PL_savestack_ix].any_dptr)
#define SSPOPDXPTR (PL_savestack[--PL_savestack_ix].any_dxptr)


/*
=for apidoc_section $callback

=for apidoc Amn;||SAVETMPS
Opening bracket for temporaries on a callback.  See C<L</FREETMPS>> and
L<perlcall>.

=for apidoc Amn;||FREETMPS
Closing bracket for temporaries on a callback.  See C<L</SAVETMPS>> and
L<perlcall>.

=for apidoc Amn;||ENTER
Opening bracket on a callback.  See C<L</LEAVE>> and L<perlcall>.

=for apidoc Amn;||LEAVE
Closing bracket on a callback.  See C<L</ENTER>> and L<perlcall>.

=for apidoc Am;||ENTER_with_name|"name"

Same as C<L</ENTER>>, but when debugging is enabled it also associates the
given literal string with the new scope.

=for apidoc Am;||LEAVE_with_name|"name"

Same as C<L</LEAVE>>, but when debugging is enabled it first checks that the
scope has the given name. C<name> must be a literal string.

=cut
*/

#define SAVETMPS Perl_savetmps(aTHX)

#define FREETMPS if (PL_tmps_ix > PL_tmps_floor) free_tmps()

#ifdef DEBUGGING
#define ENTER							\
    STMT_START {						\
        push_scope();						\
        DEBUG_SCOPE("ENTER")					\
    } STMT_END
#define LEAVE							\
    STMT_START {						\
        DEBUG_SCOPE("LEAVE")					\
        pop_scope();						\
    } STMT_END
#define ENTER_with_name(name)						\
    STMT_START {							\
        push_scope();							\
        if (PL_scopestack_name)						\
            PL_scopestack_name[PL_scopestack_ix-1] = ASSERT_IS_LITERAL(name);\
        DEBUG_SCOPE("ENTER \"" name "\"")				\
    } STMT_END
#define LEAVE_with_name(name)						\
    STMT_START {							\
        DEBUG_SCOPE("LEAVE \"" name "\"")				\
        if (PL_scopestack_name)	{					\
            CLANG_DIAG_IGNORE_STMT(-Wstring-compare);			\
            assert(((char*)PL_scopestack_name[PL_scopestack_ix-1]	\
                        == (char*)ASSERT_IS_LITERAL(name))              \
                    || strEQ(PL_scopestack_name[PL_scopestack_ix-1], name));        \
            CLANG_DIAG_RESTORE_STMT;					\
        }								\
        pop_scope();							\
    } STMT_END
#else
#define ENTER push_scope()
#define LEAVE pop_scope()
#define ENTER_with_name(name) ENTER
#define LEAVE_with_name(name) LEAVE
#endif
#define LEAVE_SCOPE(old) STMT_START { \
        if (PL_savestack_ix > old) leave_scope(old); \
    } STMT_END

#define SAVEI8(i)                   save_I8((I8*)&(i))
#define SAVEI16(i)                  save_I16((I16*)&(i))
#define SAVEI32(i)                  save_I32((I32*)&(i))
#define SAVEINT(i)                  save_int((int*)&(i))
#define SAVEIV(i)                   save_iv((IV*)&(i))
#define SAVELONG(l)                 save_long((long*)&(l))
#define SAVESTRLEN(l)               Perl_save_strlen(aTHX_ (STRLEN*)&(l))
#define SAVEBOOL(b)                 save_bool(&(b))
#define SAVESPTR(s)                 save_sptr((SV**)&(s))
#define SAVEPPTR(s)                 save_pptr((char**)&(s))
#define SAVEVPTR(s)                 save_vptr((void*)&(s))
#define SAVEPADSVANDMORTALIZE(s)    save_padsv_and_mortalize(s)
#define SAVEFREESV(s)               save_freesv(MUTABLE_SV(s))
#define SAVEFREEPADNAME(s)          save_pushptr((void *)(s), SAVEt_FREEPADNAME)
#define SAVEMORTALIZESV(s)          save_mortalizesv(MUTABLE_SV(s))
#define SAVEFREEOP(o)               save_freeop((OP*)(o))
#define SAVEFREEPV(p)               save_freepv((char*)(p))
#define SAVECLEARSV(sv)             save_clearsv((SV**)&(sv))
#define SAVEGENERICSV(s)            save_generic_svref((SV**)&(s))
#define SAVEGENERICPV(s)            save_generic_pvref((char**)&(s))
#define SAVESHAREDPV(s)             save_shared_pvref((char**)&(s))
#define SAVESETSVFLAGS(sv,mask,val) save_set_svflags(sv,mask,val)
#define SAVEFREECOPHH(h)            save_pushptr((void *)(h), SAVEt_FREECOPHH)

#define SAVEDELETE(h,k,l) \
          save_delete(MUTABLE_HV(h), (char*)(k), (I32)(l))
#define SAVEHDELETE(h,s) \
          save_hdelete(MUTABLE_HV(h), (s))
#define SAVEADELETE(a,k) \
          save_adelete(MUTABLE_AV(a), (SSize_t)(k))
#define SAVEDESTRUCTOR(f,p) \
          save_destructor((DESTRUCTORFUNC_NOCONTEXT_t)(f), (void*)(p))

#define SAVEDESTRUCTOR_X(f,p) \
          save_destructor_x((DESTRUCTORFUNC_t)(f), (void*)(p))

#define SAVESTACK_POS() \
    STMT_START {				   \
        dSS_ADD;                                   \
        SS_ADD_INT(PL_stack_sp - PL_stack_base);   \
        SS_ADD_UV(SAVEt_STACK_POS);                \
        SS_ADD_END(2);                             \
    } STMT_END

#define SAVEOP()	save_op()

#define SAVEHINTS()	save_hints()

#define SAVECOMPPAD() save_pushptr(MUTABLE_SV(PL_comppad), SAVEt_COMPPAD)

#define SAVESWITCHSTACK(f,t) \
    STMT_START {					\
        save_pushptrptr(MUTABLE_SV(f), MUTABLE_SV(t), SAVEt_SAVESWITCHSTACK); \
        SWITCHSTACK((f),(t));				\
        PL_curstackinfo->si_stack = (t);		\
    } STMT_END

/* Need to do the cop warnings like this, rather than a "SAVEFREESHAREDPV",
   because realloc() means that the value can actually change. Possibly
   could have done savefreesharedpvREF, but this way actually seems cleaner,
   as it simplifies the code that does the saves, and reduces the load on the
   save stack.  */
#define SAVECOMPILEWARNINGS() save_pushptr(PL_compiling.cop_warnings, SAVEt_COMPILE_WARNINGS)

#define SAVEPARSER(p) save_pushptr((p), SAVEt_PARSER)

#ifdef USE_ITHREADS
#  define SAVECOPSTASH_FREE(c)	SAVEIV((c)->cop_stashoff)
#  define SAVECOPFILE(c)	SAVEPPTR(CopFILE(c))
#  define SAVECOPFILE_FREE(c)	SAVESHAREDPV(CopFILE(c))
#else
#  /* XXX not refcounted */
#  define SAVECOPSTASH_FREE(c)	SAVESPTR(CopSTASH(c))
#  define SAVECOPFILE(c)	SAVESPTR(CopFILEGV(c))
#  define SAVECOPFILE_FREE(c)	SAVEGENERICSV(CopFILEGV(c))
#endif

#define SAVECOPLINE(c)		SAVEI32(CopLINE(c))

/*
=for apidoc_section $stack
=for apidoc    Am|I32|SSNEW  |Size_t size
=for apidoc_item |   |SSNEWa |Size_t_size|Size_t align
=for apidoc_item |   |SSNEWat|Size_t_size|type|Size_t align
=for apidoc_item |   |SSNEWt |Size_t size|type

These temporarily allocates data on the savestack, returning an I32 index into
the savestack, because a pointer would get broken if the savestack is moved on
reallocation.  Use L</C<SSPTR>> to convert the returned index into a pointer.

The forms differ in that plain C<SSNEW> allocates C<size> bytes;
C<SSNEWt> and C<SSNEWat> allocate C<size> objects, each of which is type
C<type>;
and <SSNEWa> and C<SSNEWat> make sure to align the new data to an C<align>
boundary.  The most useful value for the alignment is likely to be
L</C<MEM_ALIGNBYTES>>.  The alignment will be preserved through savestack
reallocation B<only> if realloc returns data aligned to a size divisible by
"align"!

=for apidoc   Am|type  |SSPTR |I32 index|type
=for apidoc_item|type *|SSPTRt|I32 index|type

These convert the C<index> returned by L/<C<SSNEW>> and kin into actual pointers.

The difference is that C<SSPTR> casts the result to C<type>, and C<SSPTRt>
casts it to a pointer of that C<type>.

=cut
 */

#define SSNEW(size)             Perl_save_alloc(aTHX_ (size), 0)
#define SSNEWt(n,t)             SSNEW((n)*sizeof(t))
#define SSNEWa(size,align)	Perl_save_alloc(aTHX_ (size), \
    (I32)(align - ((size_t)((caddr_t)&PL_savestack[PL_savestack_ix]) % align)) % align)
#define SSNEWat(n,t,align)	SSNEWa((n)*sizeof(t), align)

#define SSPTR(off,type)         ((type)  ((char*)PL_savestack + off))
#define SSPTRt(off,type)        ((type*) ((char*)PL_savestack + off))

#define save_freesv(op)		save_pushptr((void *)(op), SAVEt_FREESV)
#define save_mortalizesv(op)	save_pushptr((void *)(op), SAVEt_MORTALIZESV)

# define save_freeop(op)                    \
STMT_START {                                 \
      OP * const _o = (OP *)(op);             \
      assert(!_o->op_savefree);               \
      _o->op_savefree = 1;                     \
      save_pushptr((void *)(_o), SAVEt_FREEOP); \
    } STMT_END
#define save_freepv(pv)		save_pushptr((void *)(pv), SAVEt_FREEPV)

/*
=for apidoc_section $callback
=for apidoc save_op

Implements C<SAVEOP>.

=cut
 */

#define save_op()		save_pushptr((void *)(PL_op), SAVEt_OP)

/*
 * ex: set ts=8 sts=4 sw=4 et:
 */