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[perl5.git] / cop.h
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a0d0e21e 1/* cop.h
79072805 2 *
4eb8286e 3 * Copyright (c) 1991-1999, Larry Wall
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4 *
5 * You may distribute under the terms of either the GNU General Public
6 * License or the Artistic License, as specified in the README file.
7 *
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8 */
9
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10struct cop {
11 BASEOP
a0d0e21e 12 char * cop_label; /* label for this construct */
57843af0 13#ifdef USE_ITHREADS
11faa288 14 char * cop_stashpv; /* package line was compiled in */
57843af0
GS
15 char * cop_file; /* file name the following line # is from */
16#else
11faa288 17 HV * cop_stash; /* package line was compiled in */
79072805 18 GV * cop_filegv; /* file the following line # is from */
57843af0 19#endif
a0d0e21e
LW
20 U32 cop_seq; /* parse sequence number */
21 I32 cop_arybase; /* array base this line was compiled with */
79072805 22 line_t cop_line; /* line # of this command */
599cee73 23 SV * cop_warnings; /* lexical warnings bitmask */
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24};
25
26#define Nullcop Null(COP*)
27
57843af0
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28#ifdef USE_ITHREADS
29# define CopFILE(c) ((c)->cop_file)
30# define CopFILEGV(c) (CopFILE(c) \
31 ? gv_fetchfile(CopFILE(c)) : Nullgv)
32# define CopFILE_set(c,pv) ((c)->cop_file = savepv(pv)) /* XXX */
33# define CopFILESV(c) (CopFILE(c) \
34 ? GvSV(gv_fetchfile(CopFILE(c))) : Nullsv)
35# define CopFILEAV(c) (CopFILE(c) \
36 ? GvAV(gv_fetchfile(CopFILE(c))) : Nullav)
57843af0 37# define CopSTASHPV(c) ((c)->cop_stashpv)
11faa288
GS
38# define CopSTASHPV_set(c,pv) ((c)->cop_stashpv = savepv(pv)) /* XXX */
39# define CopSTASH(c) (CopSTASHPV(c) \
40 ? gv_stashpv(CopSTASHPV(c),GV_ADD) : Nullhv)
41# define CopSTASH_set(c,hv) CopSTASHPV_set(c, HvNAME(hv))
ed094faf
GS
42# define CopSTASH_eq(c,hv) (hv \
43 && (CopSTASHPV(c) == HvNAME(hv) \
44 || (CopSTASHPV(c) && HvNAME(hv) \
45 && strEQ(CopSTASHPV(c), HvNAME(hv)))))
57843af0
GS
46#else
47# define CopFILEGV(c) ((c)->cop_filegv)
48# define CopFILEGV_set(c,gv) ((c)->cop_filegv = gv)
49# define CopFILE_set(c,pv) ((c)->cop_filegv = gv_fetchfile(pv))
50# define CopFILESV(c) (CopFILEGV(c) ? GvSV(CopFILEGV(c)) : Nullsv)
51# define CopFILEAV(c) (CopFILEGV(c) ? GvAV(CopFILEGV(c)) : Nullav)
52# define CopFILE(c) (CopFILESV(c) ? SvPVX(CopFILESV(c)) : Nullch)
53# define CopSTASH(c) ((c)->cop_stash)
54# define CopSTASH_set(c,hv) ((c)->cop_stash = hv)
55# define CopSTASHPV(c) (CopSTASH(c) ? HvNAME(CopSTASH(c)) : Nullch)
11faa288 56# define CopSTASHPV_set(c,pv) CopSTASH_set(c, gv_stashpv(pv,GV_ADD))
ed094faf 57# define CopSTASH_eq(c,hv) (CopSTASH(c) == hv)
57843af0
GS
58#endif /* USE_ITHREADS */
59
ed094faf 60#define CopSTASH_ne(c,hv) (!CopSTASH_eq(c,hv))
cc49e20b 61#define CopLINE(c) ((c)->cop_line)
57843af0
GS
62#define CopLINE_inc(c) (++CopLINE(c))
63#define CopLINE_dec(c) (--CopLINE(c))
64#define CopLINE_set(c,l) (CopLINE(c) = (l))
cc49e20b 65
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66/*
67 * Here we have some enormously heavy (or at least ponderous) wizardry.
68 */
69
70/* subroutine context */
71struct block_sub {
72 CV * cv;
73 GV * gv;
463ee0b2 74 GV * dfoutgv;
6d4ff0d2 75#ifndef USE_THREADS
79072805 76 AV * savearray;
6d4ff0d2 77#endif /* USE_THREADS */
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78 AV * argarray;
79 U16 olddepth;
80 U8 hasargs;
cd06dffe 81 U8 lval; /* XXX merge lval and hasargs? */
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82};
83
84#define PUSHSUB(cx) \
85 cx->blk_sub.cv = cv; \
79072805 86 cx->blk_sub.olddepth = CvDEPTH(cv); \
cd06dffe
GS
87 cx->blk_sub.hasargs = hasargs; \
88 cx->blk_sub.lval = PL_op->op_private & \
89 (OPpLVAL_INTRO|OPpENTERSUB_INARGS);
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90
91#define PUSHFORMAT(cx) \
92 cx->blk_sub.cv = cv; \
93 cx->blk_sub.gv = gv; \
4633a7c4 94 cx->blk_sub.hasargs = 0; \
3280af22 95 cx->blk_sub.dfoutgv = PL_defoutgv; \
4633a7c4 96 (void)SvREFCNT_inc(cx->blk_sub.dfoutgv)
79072805 97
6d4ff0d2 98#ifdef USE_THREADS
7766f137 99# define POP_SAVEARRAY() NOOP
6d4ff0d2 100#else
7766f137 101# define POP_SAVEARRAY() \
6d4ff0d2 102 STMT_START { \
3280af22 103 SvREFCNT_dec(GvAV(PL_defgv)); \
a8bba7fa 104 GvAV(PL_defgv) = cx->blk_sub.savearray; \
6d4ff0d2
MB
105 } STMT_END
106#endif /* USE_THREADS */
107
7766f137
GS
108#ifdef USE_ITHREADS
109 /* junk in @_ spells trouble when cloning CVs, so don't leave any */
110# define CLEAR_ARGARRAY() av_clear(cx->blk_sub.argarray)
111#else
112# define CLEAR_ARGARRAY() NOOP
113#endif /* USE_ITHREADS */
114
115
b0d9ce38
GS
116#define POPSUB(cx,sv) \
117 STMT_START { \
a8bba7fa 118 if (cx->blk_sub.hasargs) { \
7766f137 119 POP_SAVEARRAY(); \
d8b46c1b 120 /* abandon @_ if it got reified */ \
a8bba7fa
GS
121 if (AvREAL(cx->blk_sub.argarray)) { \
122 SSize_t fill = AvFILLp(cx->blk_sub.argarray); \
123 SvREFCNT_dec(cx->blk_sub.argarray); \
124 cx->blk_sub.argarray = newAV(); \
125 av_extend(cx->blk_sub.argarray, fill); \
126 AvFLAGS(cx->blk_sub.argarray) = AVf_REIFY; \
127 PL_curpad[0] = (SV*)cx->blk_sub.argarray; \
d8b46c1b 128 } \
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GS
129 else { \
130 CLEAR_ARGARRAY(); \
131 } \
79072805 132 } \
b0d9ce38
GS
133 sv = (SV*)cx->blk_sub.cv; \
134 if (sv && (CvDEPTH((CV*)sv) = cx->blk_sub.olddepth)) \
135 sv = Nullsv; \
136 } STMT_END
137
138#define LEAVESUB(sv) \
139 STMT_START { \
140 if (sv) \
141 SvREFCNT_dec(sv); \
142 } STMT_END
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143
144#define POPFORMAT(cx) \
4633a7c4
LW
145 setdefout(cx->blk_sub.dfoutgv); \
146 SvREFCNT_dec(cx->blk_sub.dfoutgv);
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147
148/* eval context */
149struct block_eval {
150 I32 old_in_eval;
151 I32 old_op_type;
152 char * old_name;
153 OP * old_eval_root;
748a9306 154 SV * cur_text;
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155};
156
8990e307 157#define PUSHEVAL(cx,n,fgv) \
3280af22 158 cx->blk_eval.old_in_eval = PL_in_eval; \
a8bba7fa 159 cx->blk_eval.old_op_type = PL_op->op_type; \
7766f137 160 cx->blk_eval.old_name = (n ? savepv(n) : Nullch); \
a8bba7fa 161 cx->blk_eval.old_eval_root = PL_eval_root; \
3280af22 162 cx->blk_eval.cur_text = PL_linestr;
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163
164#define POPEVAL(cx) \
3280af22 165 PL_in_eval = cx->blk_eval.old_in_eval; \
79072805 166 optype = cx->blk_eval.old_op_type; \
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167 PL_eval_root = cx->blk_eval.old_eval_root; \
168 Safefree(cx->blk_eval.old_name);
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169
170/* loop context */
171struct block_loop {
172 char * label;
173 I32 resetsp;
174 OP * redo_op;
175 OP * next_op;
176 OP * last_op;
7766f137
GS
177#ifdef USE_ITHREADS
178 void * iterdata;
179#else
79072805 180 SV ** itervar;
7766f137 181#endif
79072805 182 SV * itersave;
5f05dabc 183 SV * iterlval;
79072805 184 AV * iterary;
89ea2908
GA
185 IV iterix;
186 IV itermax;
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187};
188
7766f137
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189#ifdef USE_ITHREADS
190# define CxITERVAR(c) \
191 ((c)->blk_loop.iterdata \
192 ? (CxPADLOOP(cx) \
193 ? &PL_curpad[(PADOFFSET)(c)->blk_loop.iterdata] \
194 : &GvSV((GV*)(c)->blk_loop.iterdata)) \
195 : (SV**)NULL)
196# define CX_ITERDATA_SET(cx,idata) \
197 if (cx->blk_loop.iterdata = (idata)) \
198 cx->blk_loop.itersave = SvREFCNT_inc(*CxITERVAR(cx));
199#else
200# define CxITERVAR(c) ((c)->blk_loop.itervar)
201# define CX_ITERDATA_SET(cx,ivar) \
202 if (cx->blk_loop.itervar = (SV**)(ivar)) \
203 cx->blk_loop.itersave = SvREFCNT_inc(*CxITERVAR(cx));
204#endif
205
206#define PUSHLOOP(cx, dat, s) \
38a230cb
GS
207 cx->blk_loop.label = PL_curcop->cop_label; \
208 cx->blk_loop.resetsp = s - PL_stack_base; \
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209 cx->blk_loop.redo_op = cLOOP->op_redoop; \
210 cx->blk_loop.next_op = cLOOP->op_nextop; \
211 cx->blk_loop.last_op = cLOOP->op_lastop; \
44a8e56a
PP
212 cx->blk_loop.iterlval = Nullsv; \
213 cx->blk_loop.iterary = Nullav; \
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214 cx->blk_loop.iterix = -1; \
215 CX_ITERDATA_SET(cx,dat);
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216
217#define POPLOOP(cx) \
a8bba7fa 218 SvREFCNT_dec(cx->blk_loop.iterlval); \
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219 if (CxITERVAR(cx)) { \
220 SV **s_v_p = CxITERVAR(cx); \
221 sv_2mortal(*s_v_p); \
222 *s_v_p = cx->blk_loop.itersave; \
44a8e56a 223 } \
a8bba7fa
GS
224 if (cx->blk_loop.iterary && cx->blk_loop.iterary != PL_curstack)\
225 SvREFCNT_dec(cx->blk_loop.iterary);
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226
227/* context common to subroutines, evals and loops */
228struct block {
229 I32 blku_oldsp; /* stack pointer to copy stuff down to */
230 COP * blku_oldcop; /* old curcop pointer */
231 I32 blku_oldretsp; /* return stack index */
232 I32 blku_oldmarksp; /* mark stack index */
233 I32 blku_oldscopesp; /* scope stack index */
234 PMOP * blku_oldpm; /* values of pattern match vars */
235 U8 blku_gimme; /* is this block running in list context? */
236
237 union {
238 struct block_sub blku_sub;
239 struct block_eval blku_eval;
240 struct block_loop blku_loop;
241 } blk_u;
242};
243#define blk_oldsp cx_u.cx_blk.blku_oldsp
244#define blk_oldcop cx_u.cx_blk.blku_oldcop
245#define blk_oldretsp cx_u.cx_blk.blku_oldretsp
246#define blk_oldmarksp cx_u.cx_blk.blku_oldmarksp
247#define blk_oldscopesp cx_u.cx_blk.blku_oldscopesp
248#define blk_oldpm cx_u.cx_blk.blku_oldpm
249#define blk_gimme cx_u.cx_blk.blku_gimme
250#define blk_sub cx_u.cx_blk.blk_u.blku_sub
251#define blk_eval cx_u.cx_blk.blk_u.blku_eval
252#define blk_loop cx_u.cx_blk.blk_u.blku_loop
253
254/* Enter a block. */
8990e307 255#define PUSHBLOCK(cx,t,sp) CXINC, cx = &cxstack[cxstack_ix], \
79072805 256 cx->cx_type = t, \
3280af22
NIS
257 cx->blk_oldsp = sp - PL_stack_base, \
258 cx->blk_oldcop = PL_curcop, \
1aff0e91 259 cx->blk_oldmarksp = PL_markstack_ptr - PL_markstack, \
3280af22 260 cx->blk_oldscopesp = PL_scopestack_ix, \
1aff0e91 261 cx->blk_oldretsp = PL_retstack_ix, \
3280af22 262 cx->blk_oldpm = PL_curpm, \
79072805 263 cx->blk_gimme = gimme; \
bf49b057 264 DEBUG_l( PerlIO_printf(Perl_debug_log, "Entering block %ld, type %s\n", \
1aff0e91 265 (long)cxstack_ix, PL_block_type[CxTYPE(cx)]); )
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266
267/* Exit a block (RETURN and LAST). */
a0d0e21e 268#define POPBLOCK(cx,pm) cx = &cxstack[cxstack_ix--], \
1aff0e91 269 newsp = PL_stack_base + cx->blk_oldsp, \
3280af22
NIS
270 PL_curcop = cx->blk_oldcop, \
271 PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp, \
272 PL_scopestack_ix = cx->blk_oldscopesp, \
273 PL_retstack_ix = cx->blk_oldretsp, \
274 pm = cx->blk_oldpm, \
275 gimme = cx->blk_gimme; \
bf49b057 276 DEBUG_l( PerlIO_printf(Perl_debug_log, "Leaving block %ld, type %s\n", \
22c35a8c 277 (long)cxstack_ix+1,PL_block_type[CxTYPE(cx)]); )
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278
279/* Continue a block elsewhere (NEXT and REDO). */
3280af22 280#define TOPBLOCK(cx) cx = &cxstack[cxstack_ix], \
1aff0e91 281 PL_stack_sp = PL_stack_base + cx->blk_oldsp, \
3280af22
NIS
282 PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp, \
283 PL_scopestack_ix = cx->blk_oldscopesp, \
2158dd9b
GS
284 PL_retstack_ix = cx->blk_oldretsp, \
285 PL_curpm = cx->blk_oldpm
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286
287/* substitution context */
288struct subst {
289 I32 sbu_iters;
290 I32 sbu_maxiters;
22e551b9 291 I32 sbu_rflags;
4633a7c4 292 I32 sbu_oldsave;
71be2cbc
PP
293 bool sbu_once;
294 bool sbu_rxtainted;
79072805
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295 char * sbu_orig;
296 SV * sbu_dstr;
297 SV * sbu_targ;
298 char * sbu_s;
299 char * sbu_m;
300 char * sbu_strend;
c90c0ff4 301 void * sbu_rxres;
c07a80fd 302 REGEXP * sbu_rx;
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303};
304#define sb_iters cx_u.cx_subst.sbu_iters
305#define sb_maxiters cx_u.cx_subst.sbu_maxiters
22e551b9 306#define sb_rflags cx_u.cx_subst.sbu_rflags
4633a7c4 307#define sb_oldsave cx_u.cx_subst.sbu_oldsave
71be2cbc
PP
308#define sb_once cx_u.cx_subst.sbu_once
309#define sb_rxtainted cx_u.cx_subst.sbu_rxtainted
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310#define sb_orig cx_u.cx_subst.sbu_orig
311#define sb_dstr cx_u.cx_subst.sbu_dstr
312#define sb_targ cx_u.cx_subst.sbu_targ
313#define sb_s cx_u.cx_subst.sbu_s
314#define sb_m cx_u.cx_subst.sbu_m
315#define sb_strend cx_u.cx_subst.sbu_strend
c90c0ff4 316#define sb_rxres cx_u.cx_subst.sbu_rxres
c07a80fd 317#define sb_rx cx_u.cx_subst.sbu_rx
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318
319#define PUSHSUBST(cx) CXINC, cx = &cxstack[cxstack_ix], \
320 cx->sb_iters = iters, \
321 cx->sb_maxiters = maxiters, \
22e551b9 322 cx->sb_rflags = r_flags, \
4633a7c4 323 cx->sb_oldsave = oldsave, \
71be2cbc
PP
324 cx->sb_once = once, \
325 cx->sb_rxtainted = rxtainted, \
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LW
326 cx->sb_orig = orig, \
327 cx->sb_dstr = dstr, \
328 cx->sb_targ = targ, \
329 cx->sb_s = s, \
330 cx->sb_m = m, \
331 cx->sb_strend = strend, \
c90c0ff4 332 cx->sb_rxres = Null(void*), \
c07a80fd 333 cx->sb_rx = rx, \
c90c0ff4
PP
334 cx->cx_type = CXt_SUBST; \
335 rxres_save(&cx->sb_rxres, rx)
79072805 336
c90c0ff4
PP
337#define POPSUBST(cx) cx = &cxstack[cxstack_ix--]; \
338 rxres_free(&cx->sb_rxres)
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339
340struct context {
6b35e009 341 U32 cx_type; /* what kind of context this is */
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342 union {
343 struct block cx_blk;
344 struct subst cx_subst;
345 } cx_u;
346};
6b35e009
GS
347
348#define CXTYPEMASK 0xff
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349#define CXt_NULL 0
350#define CXt_SUB 1
351#define CXt_EVAL 2
352#define CXt_LOOP 3
353#define CXt_SUBST 4
354#define CXt_BLOCK 5
7766f137 355#define CXt_FORMAT 6
79072805 356
6b35e009
GS
357/* private flags for CXt_EVAL */
358#define CXp_REAL 0x00000100 /* truly eval'', not a lookalike */
359
7766f137
GS
360#ifdef USE_ITHREADS
361/* private flags for CXt_LOOP */
362# define CXp_PADVAR 0x00000100 /* itervar lives on pad, iterdata
363 has pad offset; if not set,
364 iterdata holds GV* */
365# define CxPADLOOP(c) (((c)->cx_type & (CXt_LOOP|CXp_PADVAR)) \
366 == (CXt_LOOP|CXp_PADVAR))
367#endif
368
6b35e009 369#define CxTYPE(c) ((c)->cx_type & CXTYPEMASK)
7766f137
GS
370#define CxREALEVAL(c) (((c)->cx_type & (CXt_EVAL|CXp_REAL)) \
371 == (CXt_EVAL|CXp_REAL))
6b35e009 372
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373#define CXINC (cxstack_ix < cxstack_max ? ++cxstack_ix : (cxstack_ix = cxinc()))
374
375/* "gimme" values */
a0d0e21e
LW
376#define G_SCALAR 0
377#define G_ARRAY 1
54310121 378#define G_VOID 128 /* skip this bit when adding flags below */
79072805 379
864dbfa3 380/* extra flags for Perl_call_* routines */
a0d0e21e
LW
381#define G_DISCARD 2 /* Call FREETMPS. */
382#define G_EVAL 4 /* Assume eval {} around subroutine call. */
383#define G_NOARGS 8 /* Don't construct a @_ array. */
54310121 384#define G_KEEPERR 16 /* Append errors to $@, don't overwrite it */
491527d0 385#define G_NODEBUG 32 /* Disable debugging at toplevel. */
e336de0d 386
faef0170
HS
387/* flag bits for PL_in_eval */
388#define EVAL_NULL 0 /* not in an eval */
389#define EVAL_INEVAL 1 /* some enclosing scope is an eval */
390#define EVAL_WARNONLY 2 /* used by yywarn() when calling yyerror() */
864dbfa3 391#define EVAL_KEEPERR 4 /* set by Perl_call_sv if G_KEEPERR */
faef0170 392
e336de0d
GS
393/* Support for switching (stack and block) contexts.
394 * This ensures magic doesn't invalidate local stack and cx pointers.
395 */
396
e788e7d3
GS
397#define PERLSI_UNKNOWN -1
398#define PERLSI_UNDEF 0
399#define PERLSI_MAIN 1
400#define PERLSI_MAGIC 2
401#define PERLSI_SORT 3
402#define PERLSI_SIGNAL 4
403#define PERLSI_OVERLOAD 5
404#define PERLSI_DESTROY 6
405#define PERLSI_WARNHOOK 7
406#define PERLSI_DIEHOOK 8
407#define PERLSI_REQUIRE 9
e336de0d
GS
408
409struct stackinfo {
410 AV * si_stack; /* stack for current runlevel */
411 PERL_CONTEXT * si_cxstack; /* context stack for runlevel */
412 I32 si_cxix; /* current context index */
413 I32 si_cxmax; /* maximum allocated index */
414 I32 si_type; /* type of runlevel */
415 struct stackinfo * si_prev;
416 struct stackinfo * si_next;
ce2f7c3b 417 I32 si_markoff; /* offset where markstack begins for us.
e336de0d
GS
418 * currently used only with DEBUGGING,
419 * but not #ifdef-ed for bincompat */
420};
421
422typedef struct stackinfo PERL_SI;
423
3280af22
NIS
424#define cxstack (PL_curstackinfo->si_cxstack)
425#define cxstack_ix (PL_curstackinfo->si_cxix)
426#define cxstack_max (PL_curstackinfo->si_cxmax)
e336de0d
GS
427
428#ifdef DEBUGGING
ce2f7c3b
GS
429# define SET_MARK_OFFSET \
430 PL_curstackinfo->si_markoff = PL_markstack_ptr - PL_markstack
e336de0d 431#else
ce2f7c3b 432# define SET_MARK_OFFSET NOOP
e336de0d
GS
433#endif
434
d3acc0f7 435#define PUSHSTACKi(type) \
e336de0d 436 STMT_START { \
3280af22 437 PERL_SI *next = PL_curstackinfo->si_next; \
e336de0d
GS
438 if (!next) { \
439 next = new_stackinfo(32, 2048/sizeof(PERL_CONTEXT) - 1); \
3280af22
NIS
440 next->si_prev = PL_curstackinfo; \
441 PL_curstackinfo->si_next = next; \
e336de0d
GS
442 } \
443 next->si_type = type; \
444 next->si_cxix = -1; \
445 AvFILLp(next->si_stack) = 0; \
3280af22
NIS
446 SWITCHSTACK(PL_curstack,next->si_stack); \
447 PL_curstackinfo = next; \
ce2f7c3b 448 SET_MARK_OFFSET; \
e336de0d
GS
449 } STMT_END
450
e788e7d3 451#define PUSHSTACK PUSHSTACKi(PERLSI_UNKNOWN)
d3acc0f7 452
3095d977
GS
453/* POPSTACK works with PL_stack_sp, so it may need to be bracketed by
454 * PUTBACK/SPAGAIN to flush/refresh any local SP that may be active */
d3acc0f7 455#define POPSTACK \
e336de0d 456 STMT_START { \
de616352 457 djSP; \
3280af22 458 PERL_SI *prev = PL_curstackinfo->si_prev; \
e336de0d 459 if (!prev) { \
bf49b057 460 PerlIO_printf(Perl_error_log, "panic: POPSTACK\n"); \
e336de0d
GS
461 my_exit(1); \
462 } \
3280af22 463 SWITCHSTACK(PL_curstack,prev->si_stack); \
e336de0d 464 /* don't free prev here, free them all at the END{} */ \
3280af22 465 PL_curstackinfo = prev; \
e336de0d
GS
466 } STMT_END
467
468#define POPSTACK_TO(s) \
469 STMT_START { \
3280af22 470 while (PL_curstack != s) { \
bac4b2ad 471 dounwind(-1); \
d3acc0f7 472 POPSTACK; \
bac4b2ad 473 } \
e336de0d 474 } STMT_END