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fix lvalue leaks stemming from failure to free LvTARG(sv)
[perl5.git] / op.h
CommitLineData
a0d0e21e 1/* op.h
79072805 2 *
9607fc9c 3 * Copyright (c) 1991-1997, 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; \
76e3520e 41 OP* (CPERLscope(*op_ppaddr))_((ARGSproto)); \
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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
55#define GIMME_V OP_GIMME(op, block_gimme())
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56
57/* Public flags */
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58
59#define OPf_WANT 3 /* Mask for "want" bits: */
60#define OPf_WANT_VOID 1 /* Want nothing */
61#define OPf_WANT_SCALAR 2 /* Want single value */
62#define OPf_WANT_LIST 3 /* Want list of any length */
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63#define OPf_KIDS 4 /* There is a firstborn child. */
64#define OPf_PARENS 8 /* This operator was parenthesized. */
463ee0b2 65 /* (Or block needs explicit scope entry.) */
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66#define OPf_REF 16 /* Certified reference. */
67 /* (Return container, not containee). */
68#define OPf_MOD 32 /* Will modify (lvalue). */
69#define OPf_STACKED 64 /* Some arg is arriving on the stack. */
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70#define OPf_SPECIAL 128 /* Do something weird for this op: */
71 /* On local LVAL, don't init local value. */
72 /* On OP_SORT, subroutine is inlined. */
73 /* On OP_NOT, inversion was implicit. */
a0d0e21e 74 /* On OP_LEAVE, don't restore curpm. */
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75 /* On truncate, we truncate filehandle */
76 /* On control verbs, we saw no label */
77 /* On flipflop, we saw ... instead of .. */
78 /* On UNOPs, saw bare parens, e.g. eof(). */
a0d0e21e 79 /* On OP_ENTERSUB || OP_NULL, saw a "do". */
f2ec2afd 80 /* On OP_(ENTER|LEAVE)EVAL, don't clear $@ */
54b9620d 81 /* On OP_ENTERITER, loop var is per-thread */
79072805 82
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83/* old names; don't use in new code, but don't break them, either */
84#define OPf_LIST 1
85#define OPf_KNOW 2
86#define GIMME \
87 (op->op_flags & OPf_KNOW ? op->op_flags & OPf_LIST : dowantarray())
88
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89/* Private for lvalues */
90#define OPpLVAL_INTRO 128 /* Lvalue must be localized */
91
92/* Private for OP_AASSIGN */
93#define OPpASSIGN_COMMON 64 /* Left & right have syms in common. */
94
95/* Private for OP_SASSIGN */
96#define OPpASSIGN_BACKWARDS 64 /* Left & right switched. */
79072805 97
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98/* Private for OP_MATCH and OP_SUBST{,CONST} */
99#define OPpRUNTIME 64 /* Pattern coming in on the stack */
100
79072805 101/* Private for OP_TRANS */
5d06d08e 102#define OPpTRANS_COUNTONLY 8
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103#define OPpTRANS_SQUASH 16
104#define OPpTRANS_DELETE 32
105#define OPpTRANS_COMPLEMENT 64
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106
107/* Private for OP_REPEAT */
a0d0e21e 108#define OPpREPEAT_DOLIST 64 /* List replication. */
79072805 109
a0d0e21e 110/* Private for OP_ENTERSUB, OP_RV2?V, OP_?ELEM */
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111#define OPpDEREF (32|64) /* Want ref to something: */
112#define OPpDEREF_AV 32 /* Want ref to AV. */
113#define OPpDEREF_HV 64 /* Want ref to HV. */
114#define OPpDEREF_SV (32|64) /* Want ref to SV. */
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115 /* OP_ENTERSUB only */
116#define OPpENTERSUB_DB 16 /* Debug subroutine. */
117#define OPpENTERSUB_AMPER 8 /* Used & form to call. */
118 /* OP_?ELEM only */
119#define OPpLVAL_DEFER 16 /* Defer creation of array/hash elem */
120 /* for OP_RV2?V, lower bits carry hints */
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121
122/* Private for OP_CONST */
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123#define OPpCONST_ENTERED 16 /* Has been entered as symbol. */
124#define OPpCONST_ARYBASE 32 /* Was a $[ translated to constant. */
a0d0e21e 125#define OPpCONST_BARE 64 /* Was a bare word (filehandle?). */
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126
127/* Private for OP_FLIP/FLOP */
a0d0e21e 128#define OPpFLIP_LINENUM 64 /* Range arg potentially a line num. */
79072805 129
ed6116ce 130/* Private for OP_LIST */
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131#define OPpLIST_GUESSED 64 /* Guessed that pushmark was needed. */
132
5f05dabc 133/* Private for OP_DELETE */
54310121 134#define OPpSLICE 64 /* Operating on a list of keys */
5f05dabc 135
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136/* Private for OP_SORT, OP_PRTF, OP_SPRINTF, string cmp'n, and case changers */
137#define OPpLOCALE 64 /* Use locale */
138
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139/* Private for OP_THREADSV */
140#define OPpDONE_SVREF 64 /* Been through newSVREF once */
554b3eca 141
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142struct op {
143 BASEOP
144};
145
146struct unop {
147 BASEOP
148 OP * op_first;
149};
150
151struct binop {
152 BASEOP
153 OP * op_first;
154 OP * op_last;
155};
156
157struct logop {
158 BASEOP
159 OP * op_first;
160 OP * op_other;
161};
162
163struct condop {
164 BASEOP
165 OP * op_first;
166 OP * op_true;
167 OP * op_false;
168};
169
170struct listop {
171 BASEOP
172 OP * op_first;
173 OP * op_last;
174 U32 op_children;
175};
176
177struct pmop {
178 BASEOP
179 OP * op_first;
180 OP * op_last;
181 U32 op_children;
182 OP * op_pmreplroot;
183 OP * op_pmreplstart;
184 PMOP * op_pmnext; /* list of all scanpats */
185 REGEXP * op_pmregexp; /* compiled expression */
a0d0e21e 186 U16 op_pmflags;
4633a7c4 187 U16 op_pmpermflags;
48c036b1 188 U8 op_pmdynflags;
79072805 189};
a0d0e21e 190
48c036b1 191#define PMdf_USED 0x01 /* pm has been used once already */
b3eb6a9b 192#define PMdf_TAINTED 0x02 /* pm compiled from tainted pattern */
48c036b1 193
b3eb6a9b 194#define PMf_RETAINT 0x0001 /* taint $1 etc. if target tainted */
a0d0e21e 195#define PMf_ONCE 0x0002 /* use pattern only once per reset */
c277df42 196#define PMf_REVERSED 0x0004 /* Should be matched right->left */
ce862d02 197#define PMf_MAYBE_CONST 0x0008 /* replacement contains variables */
a0d0e21e 198#define PMf_SKIPWHITE 0x0010 /* skip leading whitespace for split */
8782bef2 199#define PMf_WHITE 0x0020 /* pattern is \s+ */
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200#define PMf_CONST 0x0040 /* subst replacement is constant */
201#define PMf_KEEP 0x0080 /* keep 1st runtime pattern forever */
202#define PMf_GLOBAL 0x0100 /* pattern had a g modifier */
c90c0ff4 203#define PMf_CONTINUE 0x0200 /* don't reset pos() if //g fails */
a0d0e21e 204#define PMf_EVAL 0x0400 /* evaluating replacement as expr */
8782bef2 205#define PMf_LOCALE 0x0800 /* use locale for character types */
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206#define PMf_MULTILINE 0x1000 /* assume multiple lines */
207#define PMf_SINGLELINE 0x2000 /* assume single line */
8782bef2 208#define PMf_FOLD 0x4000 /* case insensitivity */
a0d0e21e 209#define PMf_EXTENDED 0x8000 /* chuck embedded whitespace */
79072805 210
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211/* mask of bits stored in regexp->reganch */
212#define PMf_COMPILETIME (PMf_MULTILINE|PMf_SINGLELINE|PMf_LOCALE|PMf_FOLD|PMf_EXTENDED)
213
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214struct svop {
215 BASEOP
216 SV * op_sv;
217};
218
219struct gvop {
220 BASEOP
221 GV * op_gv;
222};
223
224struct pvop {
225 BASEOP
226 char * op_pv;
227};
228
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229struct loop {
230 BASEOP
231 OP * op_first;
232 OP * op_last;
233 U32 op_children;
234 OP * op_redoop;
235 OP * op_nextop;
236 OP * op_lastop;
237};
238
239#define cUNOP ((UNOP*)op)
240#define cBINOP ((BINOP*)op)
241#define cLISTOP ((LISTOP*)op)
242#define cLOGOP ((LOGOP*)op)
243#define cCONDOP ((CONDOP*)op)
244#define cPMOP ((PMOP*)op)
245#define cSVOP ((SVOP*)op)
246#define cGVOP ((GVOP*)op)
247#define cPVOP ((PVOP*)op)
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248#define cCOP ((COP*)op)
249#define cLOOP ((LOOP*)op)
250
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251#define cUNOPo ((UNOP*)o)
252#define cBINOPo ((BINOP*)o)
253#define cLISTOPo ((LISTOP*)o)
254#define cLOGOPo ((LOGOP*)o)
255#define cCONDOPo ((CONDOP*)o)
256#define cPMOPo ((PMOP*)o)
257#define cSVOPo ((SVOP*)o)
258#define cGVOPo ((GVOP*)o)
259#define cPVOPo ((PVOP*)o)
260#define cCVOPo ((CVOP*)o)
261#define cCOPo ((COP*)o)
262#define cLOOPo ((LOOP*)o)
263
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264#define kUNOP ((UNOP*)kid)
265#define kBINOP ((BINOP*)kid)
266#define kLISTOP ((LISTOP*)kid)
267#define kLOGOP ((LOGOP*)kid)
268#define kCONDOP ((CONDOP*)kid)
269#define kPMOP ((PMOP*)kid)
270#define kSVOP ((SVOP*)kid)
271#define kGVOP ((GVOP*)kid)
272#define kPVOP ((PVOP*)kid)
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273#define kCOP ((COP*)kid)
274#define kLOOP ((LOOP*)kid)
275
276#define Nullop Null(OP*)
277
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278/* Lowest byte of opargs */
279#define OA_MARK 1
280#define OA_FOLDCONST 2
281#define OA_RETSCALAR 4
282#define OA_TARGET 8
283#define OA_RETINTEGER 16
284#define OA_OTHERINT 32
285#define OA_DANGEROUS 64
286#define OA_DEFGV 128
287
db173bac 288/* The next 4 bits encode op class information */
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289#define OA_CLASS_MASK (15 << 8)
290
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291#define OA_BASEOP (0 << 8)
292#define OA_UNOP (1 << 8)
293#define OA_BINOP (2 << 8)
294#define OA_LOGOP (3 << 8)
295#define OA_CONDOP (4 << 8)
296#define OA_LISTOP (5 << 8)
297#define OA_PMOP (6 << 8)
298#define OA_SVOP (7 << 8)
299#define OA_GVOP (8 << 8)
300#define OA_PVOP (9 << 8)
301#define OA_LOOP (10 << 8)
302#define OA_COP (11 << 8)
303#define OA_BASEOP_OR_UNOP (12 << 8)
304#define OA_FILESTATOP (13 << 8)
305#define OA_LOOPEXOP (14 << 8)
306
307#define OASHIFT 12
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308
309/* Remaining nybbles of opargs */
310#define OA_SCALAR 1
311#define OA_LIST 2
312#define OA_AVREF 3
313#define OA_HVREF 4
314#define OA_CVREF 5
315#define OA_FILEREF 6
316#define OA_SCALARREF 7
317#define OA_OPTIONAL 8
318