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fix memory leak in C<sub X { sub {} }> arising from a refcount
[perl5.git] / op.h
CommitLineData
a0d0e21e 1/* op.h
79072805 2 *
3818b22b 3 * Copyright (c) 1991-2000, 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
10/*
11 * The fields of BASEOP are:
12 * op_next Pointer to next ppcode to execute after this one.
13 * (Top level pre-grafted op points to first op,
14 * but this is replaced when op is grafted in, when
15 * this op will point to the real next op, and the new
16 * parent takes over role of remembering starting op.)
17 * op_ppaddr Pointer to current ppcode's function.
18 * op_type The type of the operation.
19 * op_flags Flags common to all operations. See OPf_* below.
20 * op_private Flags peculiar to a particular operation (BUT,
21 * by default, set to the number of children until
22 * the operation is privatized by a check routine,
23 * which may or may not check number of children).
24 */
25
4633a7c4 26typedef U32 PADOFFSET;
11343788 27#define NOT_IN_PAD ((PADOFFSET) -1)
79072805 28
4633a7c4 29#ifdef DEBUGGING_OPS
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30#define OPCODE opcode
31#else
32#define OPCODE U16
33#endif
34
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35#ifdef BASEOP_DEFINITION
36#define BASEOP BASEOP_DEFINITION
37#else
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38#define BASEOP \
39 OP* op_next; \
40 OP* op_sibling; \
4f63d024 41 OP* (CPERLscope(*op_ppaddr))(pTHX); \
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42 PADOFFSET op_targ; \
43 OPCODE op_type; \
44 U16 op_seq; \
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45 U8 op_flags; \
46 U8 op_private;
0f4eea8f 47#endif
79072805 48
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49#define OP_GIMME(op,dfl) \
50 (((op)->op_flags & OPf_WANT) == OPf_WANT_VOID ? G_VOID : \
51 ((op)->op_flags & OPf_WANT) == OPf_WANT_SCALAR ? G_SCALAR : \
52 ((op)->op_flags & OPf_WANT) == OPf_WANT_LIST ? G_ARRAY : \
53 dfl)
54
954c1994
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55/*
56=for apidoc Amn|U32|GIMME_V
57The XSUB-writer's equivalent to Perl's C<wantarray>. Returns C<G_VOID>,
0139fc7d 58C<G_SCALAR> or C<G_ARRAY> for void, scalar or list context,
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59respectively.
60
61=for apidoc Amn|U32|GIMME
62A backward-compatible version of C<GIMME_V> which can only return
63C<G_SCALAR> or C<G_ARRAY>; in a void context, it returns C<G_SCALAR>.
64Deprecated. Use C<GIMME_V> instead.
65
66=cut
67*/
68
533c011a 69#define GIMME_V OP_GIMME(PL_op, block_gimme())
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70
71/* Public flags */
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72
73#define OPf_WANT 3 /* Mask for "want" bits: */
74#define OPf_WANT_VOID 1 /* Want nothing */
75#define OPf_WANT_SCALAR 2 /* Want single value */
76#define OPf_WANT_LIST 3 /* Want list of any length */
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77#define OPf_KIDS 4 /* There is a firstborn child. */
78#define OPf_PARENS 8 /* This operator was parenthesized. */
463ee0b2 79 /* (Or block needs explicit scope entry.) */
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80#define OPf_REF 16 /* Certified reference. */
81 /* (Return container, not containee). */
82#define OPf_MOD 32 /* Will modify (lvalue). */
83#define OPf_STACKED 64 /* Some arg is arriving on the stack. */
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84#define OPf_SPECIAL 128 /* Do something weird for this op: */
85 /* On local LVAL, don't init local value. */
86 /* On OP_SORT, subroutine is inlined. */
87 /* On OP_NOT, inversion was implicit. */
a0d0e21e 88 /* On OP_LEAVE, don't restore curpm. */
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89 /* On truncate, we truncate filehandle */
90 /* On control verbs, we saw no label */
91 /* On flipflop, we saw ... instead of .. */
92 /* On UNOPs, saw bare parens, e.g. eof(). */
a0d0e21e 93 /* On OP_ENTERSUB || OP_NULL, saw a "do". */
afebc493 94 /* On OP_EXISTS, treat av as av, not avhv. */
f2ec2afd 95 /* On OP_(ENTER|LEAVE)EVAL, don't clear $@ */
54b9620d 96 /* On OP_ENTERITER, loop var is per-thread */
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97 /* On pushre, re is /\s+/ imp. by split " " */
98 /* On regcomp, "use re 'eval'" was in scope */
79072805 99
54310121 100/* old names; don't use in new code, but don't break them, either */
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101#define OPf_LIST OPf_WANT_LIST
102#define OPf_KNOW OPf_WANT
954c1994 103
54310121 104#define GIMME \
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105 (PL_op->op_flags & OPf_WANT \
106 ? ((PL_op->op_flags & OPf_WANT) == OPf_WANT_LIST \
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107 ? G_ARRAY \
108 : G_SCALAR) \
109 : dowantarray())
54310121 110
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111/* NOTE: OP_NEXTSTATE, OP_DBSTATE, and OP_SETSTATE (i.e. COPs) carry lower
112 * bits of PL_hints in op_private */
113
a0d0e21e 114/* Private for lvalues */
cd06dffe 115#define OPpLVAL_INTRO 128 /* Lvalue must be localized or lvalue sub */
a0d0e21e 116
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117/* Private for OP_LEAVE, OP_LEAVESUB, OP_LEAVESUBLV and OP_LEAVEWRITE */
118#define OPpREFCOUNTED 64 /* op_targ carries a refcount */
119
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120/* Private for OP_AASSIGN */
121#define OPpASSIGN_COMMON 64 /* Left & right have syms in common. */
10c8fecd 122#define OPpASSIGN_HASH 32 /* Assigning to possible pseudohash. */
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123
124/* Private for OP_SASSIGN */
125#define OPpASSIGN_BACKWARDS 64 /* Left & right switched. */
79072805 126
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127/* Private for OP_MATCH and OP_SUBST{,CONST} */
128#define OPpRUNTIME 64 /* Pattern coming in on the stack */
129
79072805 130/* Private for OP_TRANS */
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131#define OPpTRANS_FROM_UTF 1
132#define OPpTRANS_TO_UTF 2
d6f4130b 133#define OPpTRANS_IDENTICAL 4 /* right side is same as left */
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134#define OPpTRANS_SQUASH 8
135#define OPpTRANS_DELETE 16
136#define OPpTRANS_COMPLEMENT 32
137#define OPpTRANS_GROWS 64
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138
139/* Private for OP_REPEAT */
a0d0e21e 140#define OPpREPEAT_DOLIST 64 /* List replication. */
79072805 141
d3011074 142/* Private for OP_RV2?V, OP_?ELEM */
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143#define OPpDEREF (32|64) /* Want ref to something: */
144#define OPpDEREF_AV 32 /* Want ref to AV. */
145#define OPpDEREF_HV 64 /* Want ref to HV. */
146#define OPpDEREF_SV (32|64) /* Want ref to SV. */
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147 /* OP_ENTERSUB only */
148#define OPpENTERSUB_DB 16 /* Debug subroutine. */
d3011074 149#define OPpENTERSUB_HASTARG 32 /* Called from OP tree. */
7a52d87a 150 /* OP_RV2CV only */
68dc0745 151#define OPpENTERSUB_AMPER 8 /* Used & form to call. */
9675f7ac 152#define OPpENTERSUB_NOPAREN 128 /* bare sub call (without parens) */
cd06dffe 153#define OPpENTERSUB_INARGS 4 /* Lval used as arg to a sub. */
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154 /* OP_GV only */
155#define OPpEARLY_CV 32 /* foo() called before sub foo was parsed */
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156 /* OP_?ELEM only */
157#define OPpLVAL_DEFER 16 /* Defer creation of array/hash elem */
64aac5a9 158 /* OP_RV2?V, OP_GVSV only */
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159#define OPpOUR_INTRO 16 /* Variable was in an our() */
160 /* OP_RV2[AH]V, OP_PAD[AH]V, OP_[AH]ELEM */
161#define OPpMAYBE_LVSUB 8 /* We might be an lvalue to return */
192587c2 162 /* for OP_RV2?V, lower bits carry hints (currently only HINT_STRICT_REFS) */
79072805 163
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164/* Private for OPs with TARGLEX */
165 /* (lower bits may carry MAXARG) */
166#define OPpTARGET_MY 16 /* Target is PADMY. */
167
79072805 168/* Private for OP_CONST */
7a52d87a 169#define OPpCONST_STRICT 8 /* bearword subject to strict 'subs' */
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170#define OPpCONST_ENTERED 16 /* Has been entered as symbol. */
171#define OPpCONST_ARYBASE 32 /* Was a $[ translated to constant. */
a0d0e21e 172#define OPpCONST_BARE 64 /* Was a bare word (filehandle?). */
599cee73 173#define OPpCONST_WARNING 128 /* Was a $^W translated to constant. */
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174
175/* Private for OP_FLIP/FLOP */
a0d0e21e 176#define OPpFLIP_LINENUM 64 /* Range arg potentially a line num. */
79072805 177
ed6116ce 178/* Private for OP_LIST */
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179#define OPpLIST_GUESSED 64 /* Guessed that pushmark was needed. */
180
5f05dabc 181/* Private for OP_DELETE */
54310121 182#define OPpSLICE 64 /* Operating on a list of keys */
5f05dabc 183
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184/* Private for OP_EXISTS */
185#define OPpEXISTS_SUB 64 /* Checking for &sub, not {} or []. */
186
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187/* Private for OP_SORT, OP_PRTF, OP_SPRINTF, OP_FTTEXT, OP_FTBINARY, */
188/* string comparisons, and case changers. */
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189#define OPpLOCALE 64 /* Use locale */
190
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191/* Private for OP_SORT */
192#define OPpSORT_NUMERIC 1 /* Optimized away { $a <=> $b } */
193#define OPpSORT_INTEGER 2 /* Ditto while under "use integer" */
194#define OPpSORT_REVERSE 4 /* Descending sort */
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195/* Private for OP_THREADSV */
196#define OPpDONE_SVREF 64 /* Been through newSVREF once */
554b3eca 197
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198/* Private for OP_OPEN and OP_BACKTICK */
199#define OPpOPEN_IN_RAW 16 /* binmode(F,":raw") on input fh */
200#define OPpOPEN_IN_CRLF 32 /* binmode(F,":crlf") on input fh */
201#define OPpOPEN_OUT_RAW 64 /* binmode(F,":raw") on output fh */
202#define OPpOPEN_OUT_CRLF 128 /* binmode(F,":crlf") on output fh */
203
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204/* Private for OP_EXIT */
205#define OPpEXIT_VMSISH 128 /* exit(0) vs. exit(1) vmsish mode*/
206
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207struct op {
208 BASEOP
209};
210
211struct unop {
212 BASEOP
213 OP * op_first;
214};
215
216struct binop {
217 BASEOP
218 OP * op_first;
219 OP * op_last;
220};
221
222struct logop {
223 BASEOP
224 OP * op_first;
225 OP * op_other;
226};
227
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228struct listop {
229 BASEOP
230 OP * op_first;
231 OP * op_last;
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232};
233
234struct pmop {
235 BASEOP
236 OP * op_first;
237 OP * op_last;
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238 OP * op_pmreplroot;
239 OP * op_pmreplstart;
240 PMOP * op_pmnext; /* list of all scanpats */
241 REGEXP * op_pmregexp; /* compiled expression */
a0d0e21e 242 U16 op_pmflags;
4633a7c4 243 U16 op_pmpermflags;
48c036b1 244 U8 op_pmdynflags;
79072805 245};
a0d0e21e 246
48c036b1 247#define PMdf_USED 0x01 /* pm has been used once already */
b3eb6a9b 248#define PMdf_TAINTED 0x02 /* pm compiled from tainted pattern */
7e2040f0 249#define PMdf_UTF8 0x04 /* pm compiled from utf8 data */
48c036b1 250
b3eb6a9b 251#define PMf_RETAINT 0x0001 /* taint $1 etc. if target tainted */
a0d0e21e 252#define PMf_ONCE 0x0002 /* use pattern only once per reset */
c277df42 253#define PMf_REVERSED 0x0004 /* Should be matched right->left */
ce862d02 254#define PMf_MAYBE_CONST 0x0008 /* replacement contains variables */
a0d0e21e 255#define PMf_SKIPWHITE 0x0010 /* skip leading whitespace for split */
8782bef2 256#define PMf_WHITE 0x0020 /* pattern is \s+ */
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257#define PMf_CONST 0x0040 /* subst replacement is constant */
258#define PMf_KEEP 0x0080 /* keep 1st runtime pattern forever */
259#define PMf_GLOBAL 0x0100 /* pattern had a g modifier */
c90c0ff4 260#define PMf_CONTINUE 0x0200 /* don't reset pos() if //g fails */
a0d0e21e 261#define PMf_EVAL 0x0400 /* evaluating replacement as expr */
8782bef2 262#define PMf_LOCALE 0x0800 /* use locale for character types */
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263#define PMf_MULTILINE 0x1000 /* assume multiple lines */
264#define PMf_SINGLELINE 0x2000 /* assume single line */
8782bef2 265#define PMf_FOLD 0x4000 /* case insensitivity */
a0d0e21e 266#define PMf_EXTENDED 0x8000 /* chuck embedded whitespace */
79072805 267
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268/* mask of bits stored in regexp->reganch */
269#define PMf_COMPILETIME (PMf_MULTILINE|PMf_SINGLELINE|PMf_LOCALE|PMf_FOLD|PMf_EXTENDED)
270
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271struct svop {
272 BASEOP
273 SV * op_sv;
274};
275
7934575e 276struct padop {
79072805 277 BASEOP
7934575e 278 PADOFFSET op_padix;
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279};
280
281struct pvop {
282 BASEOP
283 char * op_pv;
284};
285
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286struct loop {
287 BASEOP
288 OP * op_first;
289 OP * op_last;
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290 OP * op_redoop;
291 OP * op_nextop;
292 OP * op_lastop;
293};
294
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295#define cUNOPx(o) ((UNOP*)o)
296#define cBINOPx(o) ((BINOP*)o)
297#define cLISTOPx(o) ((LISTOP*)o)
298#define cLOGOPx(o) ((LOGOP*)o)
299#define cPMOPx(o) ((PMOP*)o)
300#define cSVOPx(o) ((SVOP*)o)
301#define cPADOPx(o) ((PADOP*)o)
302#define cPVOPx(o) ((PVOP*)o)
303#define cCOPx(o) ((COP*)o)
304#define cLOOPx(o) ((LOOP*)o)
305
306#define cUNOP cUNOPx(PL_op)
307#define cBINOP cBINOPx(PL_op)
308#define cLISTOP cLISTOPx(PL_op)
309#define cLOGOP cLOGOPx(PL_op)
310#define cPMOP cPMOPx(PL_op)
311#define cSVOP cSVOPx(PL_op)
312#define cPADOP cPADOPx(PL_op)
313#define cPVOP cPVOPx(PL_op)
314#define cCOP cCOPx(PL_op)
315#define cLOOP cLOOPx(PL_op)
316
317#define cUNOPo cUNOPx(o)
318#define cBINOPo cBINOPx(o)
319#define cLISTOPo cLISTOPx(o)
320#define cLOGOPo cLOGOPx(o)
321#define cPMOPo cPMOPx(o)
322#define cSVOPo cSVOPx(o)
323#define cPADOPo cPADOPx(o)
324#define cPVOPo cPVOPx(o)
325#define cCOPo cCOPx(o)
326#define cLOOPo cLOOPx(o)
327
328#define kUNOP cUNOPx(kid)
329#define kBINOP cBINOPx(kid)
330#define kLISTOP cLISTOPx(kid)
331#define kLOGOP cLOGOPx(kid)
332#define kPMOP cPMOPx(kid)
333#define kSVOP cSVOPx(kid)
334#define kPADOP cPADOPx(kid)
335#define kPVOP cPVOPx(kid)
336#define kCOP cCOPx(kid)
337#define kLOOP cLOOPx(kid)
338
339
340#ifdef USE_ITHREADS
638eceb6 341# define cGVOPx_gv(o) ((GV*)PL_curpad[cPADOPx(o)->op_padix])
743e66e6 342# define IS_PADGV(v) (v && SvTYPE(v) == SVt_PVGV && GvIN_PAD(v))
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343# define IS_PADCONST(v) (v && SvREADONLY(v))
344# define cSVOPx_sv(v) (cSVOPx(v)->op_sv \
345 ? cSVOPx(v)->op_sv : PL_curpad[(v)->op_targ])
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346# define cSVOPx_svp(v) (cSVOPx(v)->op_sv \
347 ? &cSVOPx(v)->op_sv : &PL_curpad[(v)->op_targ])
350de78d 348#else
638eceb6 349# define cGVOPx_gv(o) ((GV*)cSVOPx(o)->op_sv)
743e66e6 350# define IS_PADGV(v) FALSE
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351# define IS_PADCONST(v) FALSE
352# define cSVOPx_sv(v) (cSVOPx(v)->op_sv)
638eceb6 353# define cSVOPx_svp(v) (&cSVOPx(v)->op_sv)
350de78d 354#endif
79072805 355
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356#define cGVOP_gv cGVOPx_gv(PL_op)
357#define cGVOPo_gv cGVOPx_gv(o)
358#define kGVOP_gv cGVOPx_gv(kid)
359#define cSVOP_sv cSVOPx_sv(PL_op)
360#define cSVOPo_sv cSVOPx_sv(o)
361#define kSVOP_sv cSVOPx_sv(kid)
7766f137 362
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363#define Nullop Null(OP*)
364
4369b173 365/* Lowest byte of PL_opargs */
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366#define OA_MARK 1
367#define OA_FOLDCONST 2
368#define OA_RETSCALAR 4
369#define OA_TARGET 8
370#define OA_RETINTEGER 16
371#define OA_OTHERINT 32
372#define OA_DANGEROUS 64
373#define OA_DEFGV 128
b162f9ea 374#define OA_TARGLEX 256
a0d0e21e 375
db173bac 376/* The next 4 bits encode op class information */
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377#define OCSHIFT 9
378
379#define OA_CLASS_MASK (15 << OCSHIFT)
380
381#define OA_BASEOP (0 << OCSHIFT)
382#define OA_UNOP (1 << OCSHIFT)
383#define OA_BINOP (2 << OCSHIFT)
384#define OA_LOGOP (3 << OCSHIFT)
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385#define OA_LISTOP (4 << OCSHIFT)
386#define OA_PMOP (5 << OCSHIFT)
387#define OA_SVOP (6 << OCSHIFT)
7934575e 388#define OA_PADOP (7 << OCSHIFT)
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389#define OA_PVOP_OR_SVOP (8 << OCSHIFT)
390#define OA_LOOP (9 << OCSHIFT)
391#define OA_COP (10 << OCSHIFT)
392#define OA_BASEOP_OR_UNOP (11 << OCSHIFT)
393#define OA_FILESTATOP (12 << OCSHIFT)
394#define OA_LOOPEXOP (13 << OCSHIFT)
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395
396#define OASHIFT 13
a0d0e21e 397
4369b173 398/* Remaining nybbles of PL_opargs */
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399#define OA_SCALAR 1
400#define OA_LIST 2
401#define OA_AVREF 3
402#define OA_HVREF 4
403#define OA_CVREF 5
404#define OA_FILEREF 6
405#define OA_SCALARREF 7
406#define OA_OPTIONAL 8
407
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GS
408#ifdef USE_ITHREADS
409# define OP_REFCNT_INIT MUTEX_INIT(&PL_op_mutex)
410# define OP_REFCNT_LOCK MUTEX_LOCK(&PL_op_mutex)
411# define OP_REFCNT_UNLOCK MUTEX_UNLOCK(&PL_op_mutex)
412# define OP_REFCNT_TERM MUTEX_DESTROY(&PL_op_mutex)
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GS
413#else
414# define OP_REFCNT_INIT NOOP
415# define OP_REFCNT_LOCK NOOP
416# define OP_REFCNT_UNLOCK NOOP
417# define OP_REFCNT_TERM NOOP
534825c4 418#endif
e4783991 419
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420#define OpREFCNT_set(o,n) ((o)->op_targ = (n))
421#define OpREFCNT_inc(o) ((o) ? (++(o)->op_targ, (o)) : Nullop)
422#define OpREFCNT_dec(o) (--(o)->op_targ)
423
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424/* flags used by Perl_load_module() */
425#define PERL_LOADMOD_DENY 0x1
426#define PERL_LOADMOD_NOIMPORT 0x2
427#define PERL_LOADMOD_IMPORT_OPS 0x4