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a0d0e21e |
1 | /* cop.h |
79072805 |
2 | * |
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3 | * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, |
b5f8cc5c |
4 | * 2000, 2001, 2002, 2003, 2004, by Larry Wall and others |
79072805 |
5 | * |
6 | * You may distribute under the terms of either the GNU General Public |
7 | * License or the Artistic License, as specified in the README file. |
8 | * |
a3985cdc |
9 | * Control ops (cops) are one of the three ops OP_NEXTSTATE, OP_DBSTATE, |
3ffa1527 |
10 | * and OP_SETSTATE that (loosely speaking) are separate statements. |
11 | * They hold information important for lexical state and error reporting. |
12 | * At run time, PL_curcop is set to point to the most recently executed cop, |
a3985cdc |
13 | * and thus can be used to determine our current state. |
79072805 |
14 | */ |
15 | |
0d2925a6 |
16 | /* A jmpenv packages the state required to perform a proper non-local jump. |
17 | * Note that there is a start_env initialized when perl starts, and top_env |
18 | * points to this initially, so top_env should always be non-null. |
19 | * |
20 | * Existence of a non-null top_env->je_prev implies it is valid to call |
21 | * longjmp() at that runlevel (we make sure start_env.je_prev is always |
22 | * null to ensure this). |
23 | * |
24 | * je_mustcatch, when set at any runlevel to TRUE, means eval ops must |
25 | * establish a local jmpenv to handle exception traps. Care must be taken |
26 | * to restore the previous value of je_mustcatch before exiting the |
27 | * stack frame iff JMPENV_PUSH was not called in that stack frame. |
28 | * GSAR 97-03-27 |
29 | */ |
30 | |
31 | struct jmpenv { |
32 | struct jmpenv * je_prev; |
33 | Sigjmp_buf je_buf; /* only for use if !je_throw */ |
34 | int je_ret; /* last exception thrown */ |
35 | bool je_mustcatch; /* need to call longjmp()? */ |
36 | }; |
37 | |
38 | typedef struct jmpenv JMPENV; |
39 | |
40 | #ifdef OP_IN_REGISTER |
41 | #define OP_REG_TO_MEM PL_opsave = op |
42 | #define OP_MEM_TO_REG op = PL_opsave |
43 | #else |
44 | #define OP_REG_TO_MEM NOOP |
45 | #define OP_MEM_TO_REG NOOP |
46 | #endif |
47 | |
48 | /* |
49 | * How to build the first jmpenv. |
50 | * |
51 | * top_env needs to be non-zero. It points to an area |
52 | * in which longjmp() stuff is stored, as C callstack |
53 | * info there at least is thread specific this has to |
54 | * be per-thread. Otherwise a 'die' in a thread gives |
55 | * that thread the C stack of last thread to do an eval {}! |
56 | */ |
57 | |
58 | #define JMPENV_BOOTSTRAP \ |
59 | STMT_START { \ |
60 | Zero(&PL_start_env, 1, JMPENV); \ |
61 | PL_start_env.je_ret = -1; \ |
62 | PL_start_env.je_mustcatch = TRUE; \ |
63 | PL_top_env = &PL_start_env; \ |
64 | } STMT_END |
65 | |
66 | /* |
67 | * PERL_FLEXIBLE_EXCEPTIONS |
68 | * |
69 | * All the flexible exceptions code has been removed. |
70 | * See the following threads for details: |
71 | * |
72 | * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2004-07/msg00378.html |
73 | * |
74 | * Joshua's original patches (which weren't applied) and discussion: |
75 | * |
76 | * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg01396.html |
77 | * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg01489.html |
78 | * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg01491.html |
79 | * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg01608.html |
80 | * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg02144.html |
81 | * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg02998.html |
82 | * |
83 | * Chip's reworked patch and discussion: |
84 | * |
85 | * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1999-03/msg00520.html |
86 | * |
87 | * The flaw in these patches (which went unnoticed at the time) was |
88 | * that they moved some code that could potentially die() out of the |
89 | * region protected by the setjmp()s. This caused exceptions within |
90 | * END blocks and such to not be handled by the correct setjmp(). |
91 | * |
92 | * The original patches that introduces flexible exceptions were: |
93 | * |
94 | * http://public.activestate.com/cgi-bin/perlbrowse?patch=3386 |
95 | * http://public.activestate.com/cgi-bin/perlbrowse?patch=5162 |
96 | */ |
97 | |
98 | #define dJMPENV JMPENV cur_env |
99 | |
100 | #define JMPENV_PUSH(v) \ |
101 | STMT_START { \ |
102 | DEBUG_l(Perl_deb(aTHX_ "Setting up jumplevel %p, was %p\n", \ |
103 | &cur_env, PL_top_env)); \ |
104 | cur_env.je_prev = PL_top_env; \ |
105 | OP_REG_TO_MEM; \ |
106 | cur_env.je_ret = PerlProc_setjmp(cur_env.je_buf, SCOPE_SAVES_SIGNAL_MASK); \ |
107 | OP_MEM_TO_REG; \ |
108 | PL_top_env = &cur_env; \ |
109 | cur_env.je_mustcatch = FALSE; \ |
110 | (v) = cur_env.je_ret; \ |
111 | } STMT_END |
112 | |
113 | #define JMPENV_POP \ |
114 | STMT_START { \ |
115 | DEBUG_l(Perl_deb(aTHX_ "popping jumplevel was %p, now %p\n", \ |
116 | PL_top_env, cur_env.je_prev)); \ |
117 | PL_top_env = cur_env.je_prev; \ |
118 | } STMT_END |
119 | |
120 | #define JMPENV_JUMP(v) \ |
121 | STMT_START { \ |
122 | OP_REG_TO_MEM; \ |
123 | if (PL_top_env->je_prev) \ |
124 | PerlProc_longjmp(PL_top_env->je_buf, (v)); \ |
125 | if ((v) == 2) \ |
126 | PerlProc_exit(STATUS_NATIVE_EXPORT); \ |
127 | PerlIO_printf(PerlIO_stderr(), "panic: top_env\n"); \ |
128 | PerlProc_exit(1); \ |
129 | } STMT_END |
130 | |
131 | #define CATCH_GET (PL_top_env->je_mustcatch) |
132 | #define CATCH_SET(v) (PL_top_env->je_mustcatch = (v)) |
133 | |
134 | |
135 | |
79072805 |
136 | struct cop { |
137 | BASEOP |
a0d0e21e |
138 | char * cop_label; /* label for this construct */ |
57843af0 |
139 | #ifdef USE_ITHREADS |
11faa288 |
140 | char * cop_stashpv; /* package line was compiled in */ |
57843af0 |
141 | char * cop_file; /* file name the following line # is from */ |
142 | #else |
11faa288 |
143 | HV * cop_stash; /* package line was compiled in */ |
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144 | GV * cop_filegv; /* file the following line # is from */ |
57843af0 |
145 | #endif |
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146 | U32 cop_seq; /* parse sequence number */ |
147 | I32 cop_arybase; /* array base this line was compiled with */ |
79072805 |
148 | line_t cop_line; /* line # of this command */ |
599cee73 |
149 | SV * cop_warnings; /* lexical warnings bitmask */ |
ac27b0f5 |
150 | SV * cop_io; /* lexical IO defaults */ |
79072805 |
151 | }; |
152 | |
153 | #define Nullcop Null(COP*) |
154 | |
57843af0 |
155 | #ifdef USE_ITHREADS |
156 | # define CopFILE(c) ((c)->cop_file) |
157 | # define CopFILEGV(c) (CopFILE(c) \ |
158 | ? gv_fetchfile(CopFILE(c)) : Nullgv) |
083fcd59 |
159 | |
7e4e8c89 |
160 | # ifdef NETWARE |
161 | # define CopFILE_set(c,pv) ((c)->cop_file = savepv(pv)) |
162 | # else |
163 | # define CopFILE_set(c,pv) ((c)->cop_file = savesharedpv(pv)) |
164 | # endif |
083fcd59 |
165 | |
57843af0 |
166 | # define CopFILESV(c) (CopFILE(c) \ |
167 | ? GvSV(gv_fetchfile(CopFILE(c))) : Nullsv) |
168 | # define CopFILEAV(c) (CopFILE(c) \ |
169 | ? GvAV(gv_fetchfile(CopFILE(c))) : Nullav) |
57843af0 |
170 | # define CopSTASHPV(c) ((c)->cop_stashpv) |
083fcd59 |
171 | |
7e4e8c89 |
172 | # ifdef NETWARE |
173 | # define CopSTASHPV_set(c,pv) ((c)->cop_stashpv = ((pv) ? savepv(pv) : Nullch)) |
174 | # else |
175 | # define CopSTASHPV_set(c,pv) ((c)->cop_stashpv = savesharedpv(pv)) |
176 | # endif |
083fcd59 |
177 | |
11faa288 |
178 | # define CopSTASH(c) (CopSTASHPV(c) \ |
179 | ? gv_stashpv(CopSTASHPV(c),GV_ADD) : Nullhv) |
7b910cb8 |
180 | # define CopSTASH_set(c,hv) CopSTASHPV_set(c, (hv) ? HvNAME(hv) : Nullch) |
f4dd75d9 |
181 | # define CopSTASH_eq(c,hv) ((hv) \ |
ed094faf |
182 | && (CopSTASHPV(c) == HvNAME(hv) \ |
183 | || (CopSTASHPV(c) && HvNAME(hv) \ |
184 | && strEQ(CopSTASHPV(c), HvNAME(hv))))) |
7e4e8c89 |
185 | # ifdef NETWARE |
186 | # define CopSTASH_free(c) SAVECOPSTASH_FREE(c) |
187 | # else |
188 | # define CopSTASH_free(c) PerlMemShared_free(CopSTASHPV(c)) |
189 | # endif |
083fcd59 |
190 | |
7e4e8c89 |
191 | # ifdef NETWARE |
192 | # define CopFILE_free(c) SAVECOPFILE_FREE(c) |
193 | # else |
194 | # define CopFILE_free(c) (PerlMemShared_free(CopFILE(c)),(CopFILE(c) = Nullch)) |
195 | # endif |
57843af0 |
196 | #else |
197 | # define CopFILEGV(c) ((c)->cop_filegv) |
f4dd75d9 |
198 | # define CopFILEGV_set(c,gv) ((c)->cop_filegv = (GV*)SvREFCNT_inc(gv)) |
199 | # define CopFILE_set(c,pv) CopFILEGV_set((c), gv_fetchfile(pv)) |
57843af0 |
200 | # define CopFILESV(c) (CopFILEGV(c) ? GvSV(CopFILEGV(c)) : Nullsv) |
201 | # define CopFILEAV(c) (CopFILEGV(c) ? GvAV(CopFILEGV(c)) : Nullav) |
202 | # define CopFILE(c) (CopFILESV(c) ? SvPVX(CopFILESV(c)) : Nullch) |
203 | # define CopSTASH(c) ((c)->cop_stash) |
f4dd75d9 |
204 | # define CopSTASH_set(c,hv) ((c)->cop_stash = (hv)) |
57843af0 |
205 | # define CopSTASHPV(c) (CopSTASH(c) ? HvNAME(CopSTASH(c)) : Nullch) |
f4dd75d9 |
206 | /* cop_stash is not refcounted */ |
207 | # define CopSTASHPV_set(c,pv) CopSTASH_set((c), gv_stashpv(pv,GV_ADD)) |
208 | # define CopSTASH_eq(c,hv) (CopSTASH(c) == (hv)) |
05ec9bb3 |
209 | # define CopSTASH_free(c) |
210 | # define CopFILE_free(c) (SvREFCNT_dec(CopFILEGV(c)),(CopFILEGV(c) = Nullgv)) |
211 | |
57843af0 |
212 | #endif /* USE_ITHREADS */ |
213 | |
ed094faf |
214 | #define CopSTASH_ne(c,hv) (!CopSTASH_eq(c,hv)) |
cc49e20b |
215 | #define CopLINE(c) ((c)->cop_line) |
57843af0 |
216 | #define CopLINE_inc(c) (++CopLINE(c)) |
217 | #define CopLINE_dec(c) (--CopLINE(c)) |
218 | #define CopLINE_set(c,l) (CopLINE(c) = (l)) |
cc49e20b |
219 | |
248c2a4d |
220 | /* OutCopFILE() is CopFILE for output (caller, die, warn, etc.) */ |
221 | #ifdef MACOS_TRADITIONAL |
222 | # define OutCopFILE(c) MacPerl_MPWFileName(CopFILE(c)) |
223 | #else |
224 | # define OutCopFILE(c) CopFILE(c) |
225 | #endif |
226 | |
79072805 |
227 | /* |
228 | * Here we have some enormously heavy (or at least ponderous) wizardry. |
229 | */ |
230 | |
231 | /* subroutine context */ |
232 | struct block_sub { |
233 | CV * cv; |
234 | GV * gv; |
463ee0b2 |
235 | GV * dfoutgv; |
79072805 |
236 | AV * savearray; |
237 | AV * argarray; |
b8f55b69 |
238 | long olddepth; |
79072805 |
239 | U8 hasargs; |
cd06dffe |
240 | U8 lval; /* XXX merge lval and hasargs? */ |
f3548bdc |
241 | PAD *oldcomppad; |
f39bc417 |
242 | OP * retop; /* op to execute on exit from sub */ |
79072805 |
243 | }; |
244 | |
b36bdeca |
245 | /* base for the next two macros. Don't use directly. |
246 | * Note that the refcnt of the cv is incremented twice; The CX one is |
247 | * decremented by LEAVESUB, the other by LEAVE. */ |
248 | |
ee98a1d6 |
249 | #define PUSHSUB_BASE(cx) \ |
79072805 |
250 | cx->blk_sub.cv = cv; \ |
b8f55b69 |
251 | cx->blk_sub.olddepth = CvDEPTH(cv); \ |
b36bdeca |
252 | cx->blk_sub.hasargs = hasargs; \ |
f39bc417 |
253 | cx->blk_sub.retop = Nullop; \ |
b36bdeca |
254 | if (!CvDEPTH(cv)) { \ |
255 | (void)SvREFCNT_inc(cv); \ |
256 | (void)SvREFCNT_inc(cv); \ |
257 | SAVEFREESV(cv); \ |
258 | } |
259 | |
ee98a1d6 |
260 | |
261 | #define PUSHSUB(cx) \ |
262 | PUSHSUB_BASE(cx) \ |
cd06dffe |
263 | cx->blk_sub.lval = PL_op->op_private & \ |
264 | (OPpLVAL_INTRO|OPpENTERSUB_INARGS); |
79072805 |
265 | |
ee98a1d6 |
266 | /* variant for use by OP_DBSTATE, where op_private holds hint bits */ |
267 | #define PUSHSUB_DB(cx) \ |
268 | PUSHSUB_BASE(cx) \ |
269 | cx->blk_sub.lval = 0; |
270 | |
271 | |
79072805 |
272 | #define PUSHFORMAT(cx) \ |
273 | cx->blk_sub.cv = cv; \ |
274 | cx->blk_sub.gv = gv; \ |
f39bc417 |
275 | cx->blk_sub.retop = Nullop; \ |
4633a7c4 |
276 | cx->blk_sub.hasargs = 0; \ |
3280af22 |
277 | cx->blk_sub.dfoutgv = PL_defoutgv; \ |
4633a7c4 |
278 | (void)SvREFCNT_inc(cx->blk_sub.dfoutgv) |
79072805 |
279 | |
3db8f154 |
280 | #define POP_SAVEARRAY() \ |
6d4ff0d2 |
281 | STMT_START { \ |
3280af22 |
282 | SvREFCNT_dec(GvAV(PL_defgv)); \ |
a8bba7fa |
283 | GvAV(PL_defgv) = cx->blk_sub.savearray; \ |
6d4ff0d2 |
284 | } STMT_END |
6d4ff0d2 |
285 | |
ecf8e9dd |
286 | /* junk in @_ spells trouble when cloning CVs and in pp_caller(), so don't |
8e09340b |
287 | * leave any (a fast av_clear(ary), basically) */ |
288 | #define CLEAR_ARGARRAY(ary) \ |
289 | STMT_START { \ |
290 | AvMAX(ary) += AvARRAY(ary) - AvALLOC(ary); \ |
f880fe2f |
291 | SvPV_set(ary, (char*)AvALLOC(ary)); \ |
8e09340b |
292 | AvFILLp(ary) = -1; \ |
293 | } STMT_END |
7766f137 |
294 | |
b0d9ce38 |
295 | #define POPSUB(cx,sv) \ |
296 | STMT_START { \ |
a8bba7fa |
297 | if (cx->blk_sub.hasargs) { \ |
7766f137 |
298 | POP_SAVEARRAY(); \ |
d8b46c1b |
299 | /* abandon @_ if it got reified */ \ |
a8bba7fa |
300 | if (AvREAL(cx->blk_sub.argarray)) { \ |
301 | SSize_t fill = AvFILLp(cx->blk_sub.argarray); \ |
302 | SvREFCNT_dec(cx->blk_sub.argarray); \ |
303 | cx->blk_sub.argarray = newAV(); \ |
304 | av_extend(cx->blk_sub.argarray, fill); \ |
305 | AvFLAGS(cx->blk_sub.argarray) = AVf_REIFY; \ |
dd2155a4 |
306 | CX_CURPAD_SV(cx->blk_sub, 0) = (SV*)cx->blk_sub.argarray; \ |
d8b46c1b |
307 | } \ |
7766f137 |
308 | else { \ |
8e09340b |
309 | CLEAR_ARGARRAY(cx->blk_sub.argarray); \ |
7766f137 |
310 | } \ |
79072805 |
311 | } \ |
b0d9ce38 |
312 | sv = (SV*)cx->blk_sub.cv; \ |
313 | if (sv && (CvDEPTH((CV*)sv) = cx->blk_sub.olddepth)) \ |
314 | sv = Nullsv; \ |
315 | } STMT_END |
316 | |
317 | #define LEAVESUB(sv) \ |
318 | STMT_START { \ |
319 | if (sv) \ |
320 | SvREFCNT_dec(sv); \ |
321 | } STMT_END |
79072805 |
322 | |
323 | #define POPFORMAT(cx) \ |
4633a7c4 |
324 | setdefout(cx->blk_sub.dfoutgv); \ |
325 | SvREFCNT_dec(cx->blk_sub.dfoutgv); |
79072805 |
326 | |
327 | /* eval context */ |
328 | struct block_eval { |
329 | I32 old_in_eval; |
330 | I32 old_op_type; |
0f79a09d |
331 | SV * old_namesv; |
79072805 |
332 | OP * old_eval_root; |
748a9306 |
333 | SV * cur_text; |
2090ab20 |
334 | CV * cv; |
f39bc417 |
335 | OP * retop; /* op to execute on exit from eval */ |
abd70938 |
336 | JMPENV * cur_top_env; /* value of PL_top_env when eval CX created */ |
79072805 |
337 | }; |
338 | |
8990e307 |
339 | #define PUSHEVAL(cx,n,fgv) \ |
0f79a09d |
340 | STMT_START { \ |
3280af22 |
341 | cx->blk_eval.old_in_eval = PL_in_eval; \ |
a8bba7fa |
342 | cx->blk_eval.old_op_type = PL_op->op_type; \ |
0f79a09d |
343 | cx->blk_eval.old_namesv = (n ? newSVpv(n,0) : Nullsv); \ |
a8bba7fa |
344 | cx->blk_eval.old_eval_root = PL_eval_root; \ |
0f79a09d |
345 | cx->blk_eval.cur_text = PL_linestr; \ |
2090ab20 |
346 | cx->blk_eval.cv = Nullcv; /* set by doeval(), as applicable */ \ |
f39bc417 |
347 | cx->blk_eval.retop = Nullop; \ |
abd70938 |
348 | cx->blk_eval.cur_top_env = PL_top_env; \ |
0f79a09d |
349 | } STMT_END |
79072805 |
350 | |
351 | #define POPEVAL(cx) \ |
0f79a09d |
352 | STMT_START { \ |
3280af22 |
353 | PL_in_eval = cx->blk_eval.old_in_eval; \ |
79072805 |
354 | optype = cx->blk_eval.old_op_type; \ |
7766f137 |
355 | PL_eval_root = cx->blk_eval.old_eval_root; \ |
0f79a09d |
356 | if (cx->blk_eval.old_namesv) \ |
357 | sv_2mortal(cx->blk_eval.old_namesv); \ |
358 | } STMT_END |
79072805 |
359 | |
360 | /* loop context */ |
361 | struct block_loop { |
362 | char * label; |
363 | I32 resetsp; |
364 | OP * redo_op; |
365 | OP * next_op; |
366 | OP * last_op; |
7766f137 |
367 | #ifdef USE_ITHREADS |
368 | void * iterdata; |
f3548bdc |
369 | PAD *oldcomppad; |
7766f137 |
370 | #else |
79072805 |
371 | SV ** itervar; |
7766f137 |
372 | #endif |
79072805 |
373 | SV * itersave; |
5f05dabc |
374 | SV * iterlval; |
79072805 |
375 | AV * iterary; |
89ea2908 |
376 | IV iterix; |
377 | IV itermax; |
79072805 |
378 | }; |
379 | |
7766f137 |
380 | #ifdef USE_ITHREADS |
381 | # define CxITERVAR(c) \ |
382 | ((c)->blk_loop.iterdata \ |
383 | ? (CxPADLOOP(cx) \ |
dd2155a4 |
384 | ? &CX_CURPAD_SV( (c)->blk_loop, \ |
385 | INT2PTR(PADOFFSET, (c)->blk_loop.iterdata)) \ |
7766f137 |
386 | : &GvSV((GV*)(c)->blk_loop.iterdata)) \ |
387 | : (SV**)NULL) |
388 | # define CX_ITERDATA_SET(cx,idata) \ |
dd2155a4 |
389 | CX_CURPAD_SAVE(cx->blk_loop); \ |
155aba94 |
390 | if ((cx->blk_loop.iterdata = (idata))) \ |
d10edb75 |
391 | cx->blk_loop.itersave = SvREFCNT_inc(*CxITERVAR(cx)); \ |
392 | else \ |
393 | cx->blk_loop.itersave = Nullsv; |
7766f137 |
394 | #else |
395 | # define CxITERVAR(c) ((c)->blk_loop.itervar) |
396 | # define CX_ITERDATA_SET(cx,ivar) \ |
155aba94 |
397 | if ((cx->blk_loop.itervar = (SV**)(ivar))) \ |
d10edb75 |
398 | cx->blk_loop.itersave = SvREFCNT_inc(*CxITERVAR(cx)); \ |
399 | else \ |
400 | cx->blk_loop.itersave = Nullsv; |
7766f137 |
401 | #endif |
402 | |
403 | #define PUSHLOOP(cx, dat, s) \ |
38a230cb |
404 | cx->blk_loop.label = PL_curcop->cop_label; \ |
405 | cx->blk_loop.resetsp = s - PL_stack_base; \ |
79072805 |
406 | cx->blk_loop.redo_op = cLOOP->op_redoop; \ |
407 | cx->blk_loop.next_op = cLOOP->op_nextop; \ |
408 | cx->blk_loop.last_op = cLOOP->op_lastop; \ |
44a8e56a |
409 | cx->blk_loop.iterlval = Nullsv; \ |
410 | cx->blk_loop.iterary = Nullav; \ |
7766f137 |
411 | cx->blk_loop.iterix = -1; \ |
412 | CX_ITERDATA_SET(cx,dat); |
79072805 |
413 | |
414 | #define POPLOOP(cx) \ |
a8bba7fa |
415 | SvREFCNT_dec(cx->blk_loop.iterlval); \ |
7766f137 |
416 | if (CxITERVAR(cx)) { \ |
417 | SV **s_v_p = CxITERVAR(cx); \ |
418 | sv_2mortal(*s_v_p); \ |
419 | *s_v_p = cx->blk_loop.itersave; \ |
44a8e56a |
420 | } \ |
a8bba7fa |
421 | if (cx->blk_loop.iterary && cx->blk_loop.iterary != PL_curstack)\ |
422 | SvREFCNT_dec(cx->blk_loop.iterary); |
79072805 |
423 | |
424 | /* context common to subroutines, evals and loops */ |
425 | struct block { |
426 | I32 blku_oldsp; /* stack pointer to copy stuff down to */ |
427 | COP * blku_oldcop; /* old curcop pointer */ |
79072805 |
428 | I32 blku_oldmarksp; /* mark stack index */ |
429 | I32 blku_oldscopesp; /* scope stack index */ |
430 | PMOP * blku_oldpm; /* values of pattern match vars */ |
431 | U8 blku_gimme; /* is this block running in list context? */ |
432 | |
433 | union { |
434 | struct block_sub blku_sub; |
435 | struct block_eval blku_eval; |
436 | struct block_loop blku_loop; |
437 | } blk_u; |
438 | }; |
439 | #define blk_oldsp cx_u.cx_blk.blku_oldsp |
440 | #define blk_oldcop cx_u.cx_blk.blku_oldcop |
79072805 |
441 | #define blk_oldmarksp cx_u.cx_blk.blku_oldmarksp |
442 | #define blk_oldscopesp cx_u.cx_blk.blku_oldscopesp |
443 | #define blk_oldpm cx_u.cx_blk.blku_oldpm |
444 | #define blk_gimme cx_u.cx_blk.blku_gimme |
445 | #define blk_sub cx_u.cx_blk.blk_u.blku_sub |
446 | #define blk_eval cx_u.cx_blk.blk_u.blku_eval |
447 | #define blk_loop cx_u.cx_blk.blk_u.blku_loop |
448 | |
449 | /* Enter a block. */ |
8990e307 |
450 | #define PUSHBLOCK(cx,t,sp) CXINC, cx = &cxstack[cxstack_ix], \ |
79072805 |
451 | cx->cx_type = t, \ |
3280af22 |
452 | cx->blk_oldsp = sp - PL_stack_base, \ |
453 | cx->blk_oldcop = PL_curcop, \ |
1aff0e91 |
454 | cx->blk_oldmarksp = PL_markstack_ptr - PL_markstack, \ |
3280af22 |
455 | cx->blk_oldscopesp = PL_scopestack_ix, \ |
3280af22 |
456 | cx->blk_oldpm = PL_curpm, \ |
eb160463 |
457 | cx->blk_gimme = (U8)gimme; \ |
bf49b057 |
458 | DEBUG_l( PerlIO_printf(Perl_debug_log, "Entering block %ld, type %s\n", \ |
1aff0e91 |
459 | (long)cxstack_ix, PL_block_type[CxTYPE(cx)]); ) |
79072805 |
460 | |
461 | /* Exit a block (RETURN and LAST). */ |
a0d0e21e |
462 | #define POPBLOCK(cx,pm) cx = &cxstack[cxstack_ix--], \ |
1aff0e91 |
463 | newsp = PL_stack_base + cx->blk_oldsp, \ |
3280af22 |
464 | PL_curcop = cx->blk_oldcop, \ |
465 | PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp, \ |
466 | PL_scopestack_ix = cx->blk_oldscopesp, \ |
3280af22 |
467 | pm = cx->blk_oldpm, \ |
468 | gimme = cx->blk_gimme; \ |
b4ab917c |
469 | DEBUG_SCOPE("POPBLOCK"); \ |
bf49b057 |
470 | DEBUG_l( PerlIO_printf(Perl_debug_log, "Leaving block %ld, type %s\n", \ |
22c35a8c |
471 | (long)cxstack_ix+1,PL_block_type[CxTYPE(cx)]); ) |
79072805 |
472 | |
473 | /* Continue a block elsewhere (NEXT and REDO). */ |
3280af22 |
474 | #define TOPBLOCK(cx) cx = &cxstack[cxstack_ix], \ |
1aff0e91 |
475 | PL_stack_sp = PL_stack_base + cx->blk_oldsp, \ |
3280af22 |
476 | PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp, \ |
477 | PL_scopestack_ix = cx->blk_oldscopesp, \ |
b4ab917c |
478 | PL_curpm = cx->blk_oldpm; \ |
479 | DEBUG_SCOPE("TOPBLOCK"); |
79072805 |
480 | |
481 | /* substitution context */ |
482 | struct subst { |
483 | I32 sbu_iters; |
484 | I32 sbu_maxiters; |
22e551b9 |
485 | I32 sbu_rflags; |
4633a7c4 |
486 | I32 sbu_oldsave; |
71be2cbc |
487 | bool sbu_once; |
488 | bool sbu_rxtainted; |
79072805 |
489 | char * sbu_orig; |
490 | SV * sbu_dstr; |
491 | SV * sbu_targ; |
492 | char * sbu_s; |
493 | char * sbu_m; |
494 | char * sbu_strend; |
c90c0ff4 |
495 | void * sbu_rxres; |
c07a80fd |
496 | REGEXP * sbu_rx; |
79072805 |
497 | }; |
498 | #define sb_iters cx_u.cx_subst.sbu_iters |
499 | #define sb_maxiters cx_u.cx_subst.sbu_maxiters |
22e551b9 |
500 | #define sb_rflags cx_u.cx_subst.sbu_rflags |
4633a7c4 |
501 | #define sb_oldsave cx_u.cx_subst.sbu_oldsave |
71be2cbc |
502 | #define sb_once cx_u.cx_subst.sbu_once |
503 | #define sb_rxtainted cx_u.cx_subst.sbu_rxtainted |
79072805 |
504 | #define sb_orig cx_u.cx_subst.sbu_orig |
505 | #define sb_dstr cx_u.cx_subst.sbu_dstr |
506 | #define sb_targ cx_u.cx_subst.sbu_targ |
507 | #define sb_s cx_u.cx_subst.sbu_s |
508 | #define sb_m cx_u.cx_subst.sbu_m |
509 | #define sb_strend cx_u.cx_subst.sbu_strend |
c90c0ff4 |
510 | #define sb_rxres cx_u.cx_subst.sbu_rxres |
c07a80fd |
511 | #define sb_rx cx_u.cx_subst.sbu_rx |
79072805 |
512 | |
513 | #define PUSHSUBST(cx) CXINC, cx = &cxstack[cxstack_ix], \ |
514 | cx->sb_iters = iters, \ |
515 | cx->sb_maxiters = maxiters, \ |
22e551b9 |
516 | cx->sb_rflags = r_flags, \ |
4633a7c4 |
517 | cx->sb_oldsave = oldsave, \ |
71be2cbc |
518 | cx->sb_once = once, \ |
519 | cx->sb_rxtainted = rxtainted, \ |
79072805 |
520 | cx->sb_orig = orig, \ |
521 | cx->sb_dstr = dstr, \ |
522 | cx->sb_targ = targ, \ |
523 | cx->sb_s = s, \ |
524 | cx->sb_m = m, \ |
525 | cx->sb_strend = strend, \ |
c90c0ff4 |
526 | cx->sb_rxres = Null(void*), \ |
c07a80fd |
527 | cx->sb_rx = rx, \ |
c90c0ff4 |
528 | cx->cx_type = CXt_SUBST; \ |
529 | rxres_save(&cx->sb_rxres, rx) |
79072805 |
530 | |
c90c0ff4 |
531 | #define POPSUBST(cx) cx = &cxstack[cxstack_ix--]; \ |
532 | rxres_free(&cx->sb_rxres) |
79072805 |
533 | |
534 | struct context { |
6b35e009 |
535 | U32 cx_type; /* what kind of context this is */ |
79072805 |
536 | union { |
537 | struct block cx_blk; |
538 | struct subst cx_subst; |
539 | } cx_u; |
540 | }; |
6b35e009 |
541 | |
542 | #define CXTYPEMASK 0xff |
79072805 |
543 | #define CXt_NULL 0 |
544 | #define CXt_SUB 1 |
545 | #define CXt_EVAL 2 |
546 | #define CXt_LOOP 3 |
547 | #define CXt_SUBST 4 |
548 | #define CXt_BLOCK 5 |
7766f137 |
549 | #define CXt_FORMAT 6 |
79072805 |
550 | |
6b35e009 |
551 | /* private flags for CXt_EVAL */ |
552 | #define CXp_REAL 0x00000100 /* truly eval'', not a lookalike */ |
1d76a5c3 |
553 | #define CXp_TRYBLOCK 0x00000200 /* eval{}, not eval'' or similar */ |
6b35e009 |
554 | |
7766f137 |
555 | #ifdef USE_ITHREADS |
556 | /* private flags for CXt_LOOP */ |
557 | # define CXp_PADVAR 0x00000100 /* itervar lives on pad, iterdata |
558 | has pad offset; if not set, |
559 | iterdata holds GV* */ |
560 | # define CxPADLOOP(c) (((c)->cx_type & (CXt_LOOP|CXp_PADVAR)) \ |
561 | == (CXt_LOOP|CXp_PADVAR)) |
562 | #endif |
563 | |
6b35e009 |
564 | #define CxTYPE(c) ((c)->cx_type & CXTYPEMASK) |
7766f137 |
565 | #define CxREALEVAL(c) (((c)->cx_type & (CXt_EVAL|CXp_REAL)) \ |
566 | == (CXt_EVAL|CXp_REAL)) |
1d76a5c3 |
567 | #define CxTRYBLOCK(c) (((c)->cx_type & (CXt_EVAL|CXp_TRYBLOCK)) \ |
568 | == (CXt_EVAL|CXp_TRYBLOCK)) |
6b35e009 |
569 | |
79072805 |
570 | #define CXINC (cxstack_ix < cxstack_max ? ++cxstack_ix : (cxstack_ix = cxinc())) |
571 | |
ccfc67b7 |
572 | /* |
573 | =head1 "Gimme" Values |
574 | */ |
954c1994 |
575 | |
576 | /* |
577 | =for apidoc AmU||G_SCALAR |
578 | Used to indicate scalar context. See C<GIMME_V>, C<GIMME>, and |
579 | L<perlcall>. |
580 | |
581 | =for apidoc AmU||G_ARRAY |
91e74348 |
582 | Used to indicate list context. See C<GIMME_V>, C<GIMME> and |
954c1994 |
583 | L<perlcall>. |
584 | |
585 | =for apidoc AmU||G_VOID |
586 | Used to indicate void context. See C<GIMME_V> and L<perlcall>. |
587 | |
588 | =for apidoc AmU||G_DISCARD |
589 | Indicates that arguments returned from a callback should be discarded. See |
590 | L<perlcall>. |
591 | |
592 | =for apidoc AmU||G_EVAL |
593 | |
594 | Used to force a Perl C<eval> wrapper around a callback. See |
595 | L<perlcall>. |
596 | |
597 | =for apidoc AmU||G_NOARGS |
598 | |
599 | Indicates that no arguments are being sent to a callback. See |
600 | L<perlcall>. |
601 | |
602 | =cut |
603 | */ |
604 | |
a0d0e21e |
605 | #define G_SCALAR 0 |
606 | #define G_ARRAY 1 |
54310121 |
607 | #define G_VOID 128 /* skip this bit when adding flags below */ |
79072805 |
608 | |
864dbfa3 |
609 | /* extra flags for Perl_call_* routines */ |
a0d0e21e |
610 | #define G_DISCARD 2 /* Call FREETMPS. */ |
611 | #define G_EVAL 4 /* Assume eval {} around subroutine call. */ |
612 | #define G_NOARGS 8 /* Don't construct a @_ array. */ |
54310121 |
613 | #define G_KEEPERR 16 /* Append errors to $@, don't overwrite it */ |
491527d0 |
614 | #define G_NODEBUG 32 /* Disable debugging at toplevel. */ |
968b3946 |
615 | #define G_METHOD 64 /* Calling method. */ |
e336de0d |
616 | |
faef0170 |
617 | /* flag bits for PL_in_eval */ |
618 | #define EVAL_NULL 0 /* not in an eval */ |
619 | #define EVAL_INEVAL 1 /* some enclosing scope is an eval */ |
620 | #define EVAL_WARNONLY 2 /* used by yywarn() when calling yyerror() */ |
864dbfa3 |
621 | #define EVAL_KEEPERR 4 /* set by Perl_call_sv if G_KEEPERR */ |
6dc8a9e4 |
622 | #define EVAL_INREQUIRE 8 /* The code is being required. */ |
faef0170 |
623 | |
e336de0d |
624 | /* Support for switching (stack and block) contexts. |
625 | * This ensures magic doesn't invalidate local stack and cx pointers. |
626 | */ |
627 | |
e788e7d3 |
628 | #define PERLSI_UNKNOWN -1 |
629 | #define PERLSI_UNDEF 0 |
630 | #define PERLSI_MAIN 1 |
631 | #define PERLSI_MAGIC 2 |
632 | #define PERLSI_SORT 3 |
633 | #define PERLSI_SIGNAL 4 |
634 | #define PERLSI_OVERLOAD 5 |
635 | #define PERLSI_DESTROY 6 |
636 | #define PERLSI_WARNHOOK 7 |
637 | #define PERLSI_DIEHOOK 8 |
638 | #define PERLSI_REQUIRE 9 |
e336de0d |
639 | |
640 | struct stackinfo { |
641 | AV * si_stack; /* stack for current runlevel */ |
642 | PERL_CONTEXT * si_cxstack; /* context stack for runlevel */ |
643 | I32 si_cxix; /* current context index */ |
644 | I32 si_cxmax; /* maximum allocated index */ |
645 | I32 si_type; /* type of runlevel */ |
646 | struct stackinfo * si_prev; |
647 | struct stackinfo * si_next; |
ce2f7c3b |
648 | I32 si_markoff; /* offset where markstack begins for us. |
e336de0d |
649 | * currently used only with DEBUGGING, |
650 | * but not #ifdef-ed for bincompat */ |
651 | }; |
652 | |
653 | typedef struct stackinfo PERL_SI; |
654 | |
3280af22 |
655 | #define cxstack (PL_curstackinfo->si_cxstack) |
656 | #define cxstack_ix (PL_curstackinfo->si_cxix) |
657 | #define cxstack_max (PL_curstackinfo->si_cxmax) |
e336de0d |
658 | |
659 | #ifdef DEBUGGING |
ce2f7c3b |
660 | # define SET_MARK_OFFSET \ |
661 | PL_curstackinfo->si_markoff = PL_markstack_ptr - PL_markstack |
e336de0d |
662 | #else |
ce2f7c3b |
663 | # define SET_MARK_OFFSET NOOP |
e336de0d |
664 | #endif |
665 | |
d3acc0f7 |
666 | #define PUSHSTACKi(type) \ |
e336de0d |
667 | STMT_START { \ |
3280af22 |
668 | PERL_SI *next = PL_curstackinfo->si_next; \ |
e336de0d |
669 | if (!next) { \ |
670 | next = new_stackinfo(32, 2048/sizeof(PERL_CONTEXT) - 1); \ |
3280af22 |
671 | next->si_prev = PL_curstackinfo; \ |
672 | PL_curstackinfo->si_next = next; \ |
e336de0d |
673 | } \ |
674 | next->si_type = type; \ |
675 | next->si_cxix = -1; \ |
676 | AvFILLp(next->si_stack) = 0; \ |
3280af22 |
677 | SWITCHSTACK(PL_curstack,next->si_stack); \ |
678 | PL_curstackinfo = next; \ |
ce2f7c3b |
679 | SET_MARK_OFFSET; \ |
e336de0d |
680 | } STMT_END |
681 | |
e788e7d3 |
682 | #define PUSHSTACK PUSHSTACKi(PERLSI_UNKNOWN) |
d3acc0f7 |
683 | |
3095d977 |
684 | /* POPSTACK works with PL_stack_sp, so it may need to be bracketed by |
685 | * PUTBACK/SPAGAIN to flush/refresh any local SP that may be active */ |
d3acc0f7 |
686 | #define POPSTACK \ |
e336de0d |
687 | STMT_START { \ |
39644a26 |
688 | dSP; \ |
3280af22 |
689 | PERL_SI *prev = PL_curstackinfo->si_prev; \ |
e336de0d |
690 | if (!prev) { \ |
bf49b057 |
691 | PerlIO_printf(Perl_error_log, "panic: POPSTACK\n"); \ |
e336de0d |
692 | my_exit(1); \ |
693 | } \ |
3280af22 |
694 | SWITCHSTACK(PL_curstack,prev->si_stack); \ |
e336de0d |
695 | /* don't free prev here, free them all at the END{} */ \ |
3280af22 |
696 | PL_curstackinfo = prev; \ |
e336de0d |
697 | } STMT_END |
698 | |
699 | #define POPSTACK_TO(s) \ |
700 | STMT_START { \ |
3280af22 |
701 | while (PL_curstack != s) { \ |
bac4b2ad |
702 | dounwind(-1); \ |
d3acc0f7 |
703 | POPSTACK; \ |
bac4b2ad |
704 | } \ |
e336de0d |
705 | } STMT_END |
923e4eb5 |
706 | |
707 | #define IN_PERL_COMPILETIME (PL_curcop == &PL_compiling) |
708 | #define IN_PERL_RUNTIME (PL_curcop != &PL_compiling) |
709 | |