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[perl5.git] / op.h
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a0d0e21e 1/* op.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
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
533c011a 55#define GIMME_V OP_GIMME(PL_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 */
357694d4 82 /* On pushre, re is /\s+/ imp. by split " " */
79072805 83
54310121 84/* old names; don't use in new code, but don't break them, either */
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85#define OPf_LIST OPf_WANT_LIST
86#define OPf_KNOW OPf_WANT
54310121 87#define GIMME \
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88 (PL_op->op_flags & OPf_WANT \
89 ? ((PL_op->op_flags & OPf_WANT) == OPf_WANT_LIST \
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90 ? G_ARRAY \
91 : G_SCALAR) \
92 : dowantarray())
54310121 93
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94/* Private for lvalues */
95#define OPpLVAL_INTRO 128 /* Lvalue must be localized */
96
97/* Private for OP_AASSIGN */
98#define OPpASSIGN_COMMON 64 /* Left & right have syms in common. */
99
100/* Private for OP_SASSIGN */
101#define OPpASSIGN_BACKWARDS 64 /* Left & right switched. */
79072805 102
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103/* Private for OP_MATCH and OP_SUBST{,CONST} */
104#define OPpRUNTIME 64 /* Pattern coming in on the stack */
105
79072805 106/* Private for OP_TRANS */
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107#define OPpTRANS_FROM_UTF 1
108#define OPpTRANS_TO_UTF 2
109#define OPpTRANS_IDENTICAL 4
110 /* When CU or UC, means straight latin-1 to utf-8 or vice versa */
111 /* Otherwise, IDENTICAL means the right side is the same as the left */
112#define OPpTRANS_SQUASH 8
113#define OPpTRANS_DELETE 16
114#define OPpTRANS_COMPLEMENT 32
115#define OPpTRANS_GROWS 64
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116
117/* Private for OP_REPEAT */
a0d0e21e 118#define OPpREPEAT_DOLIST 64 /* List replication. */
79072805 119
a0d0e21e 120/* Private for OP_ENTERSUB, OP_RV2?V, OP_?ELEM */
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121#define OPpDEREF (32|64) /* Want ref to something: */
122#define OPpDEREF_AV 32 /* Want ref to AV. */
123#define OPpDEREF_HV 64 /* Want ref to HV. */
124#define OPpDEREF_SV (32|64) /* Want ref to SV. */
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125 /* OP_ENTERSUB only */
126#define OPpENTERSUB_DB 16 /* Debug subroutine. */
7a52d87a 127 /* OP_RV2CV only */
68dc0745 128#define OPpENTERSUB_AMPER 8 /* Used & form to call. */
9675f7ac 129#define OPpENTERSUB_NOPAREN 128 /* bare sub call (without parens) */
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130 /* OP_GV only */
131#define OPpEARLY_CV 32 /* foo() called before sub foo was parsed */
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132 /* OP_?ELEM only */
133#define OPpLVAL_DEFER 16 /* Defer creation of array/hash elem */
134 /* for OP_RV2?V, lower bits carry hints */
79072805 135
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136/* Private for OPs with TARGLEX */
137 /* (lower bits may carry MAXARG) */
138#define OPpTARGET_MY 16 /* Target is PADMY. */
139
79072805 140/* Private for OP_CONST */
7a52d87a 141#define OPpCONST_STRICT 8 /* bearword subject to strict 'subs' */
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142#define OPpCONST_ENTERED 16 /* Has been entered as symbol. */
143#define OPpCONST_ARYBASE 32 /* Was a $[ translated to constant. */
a0d0e21e 144#define OPpCONST_BARE 64 /* Was a bare word (filehandle?). */
599cee73 145#define OPpCONST_WARNING 128 /* Was a $^W translated to constant. */
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146
147/* Private for OP_FLIP/FLOP */
a0d0e21e 148#define OPpFLIP_LINENUM 64 /* Range arg potentially a line num. */
79072805 149
ed6116ce 150/* Private for OP_LIST */
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151#define OPpLIST_GUESSED 64 /* Guessed that pushmark was needed. */
152
5f05dabc 153/* Private for OP_DELETE */
54310121 154#define OPpSLICE 64 /* Operating on a list of keys */
5f05dabc 155
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156/* Private for OP_SORT, OP_PRTF, OP_SPRINTF, string cmp'n, and case changers */
157#define OPpLOCALE 64 /* Use locale */
158
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159/* Private for OP_SORT */
160#define OPpSORT_NUMERIC 1 /* Optimized away { $a <=> $b } */
161#define OPpSORT_INTEGER 2 /* Ditto while under "use integer" */
162#define OPpSORT_REVERSE 4 /* Descending sort */
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163/* Private for OP_THREADSV */
164#define OPpDONE_SVREF 64 /* Been through newSVREF once */
554b3eca 165
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166struct op {
167 BASEOP
168};
169
170struct unop {
171 BASEOP
172 OP * op_first;
173};
174
175struct binop {
176 BASEOP
177 OP * op_first;
178 OP * op_last;
179};
180
181struct logop {
182 BASEOP
183 OP * op_first;
184 OP * op_other;
185};
186
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187struct listop {
188 BASEOP
189 OP * op_first;
190 OP * op_last;
191 U32 op_children;
192};
193
194struct pmop {
195 BASEOP
196 OP * op_first;
197 OP * op_last;
198 U32 op_children;
199 OP * op_pmreplroot;
200 OP * op_pmreplstart;
201 PMOP * op_pmnext; /* list of all scanpats */
202 REGEXP * op_pmregexp; /* compiled expression */
a0d0e21e 203 U16 op_pmflags;
4633a7c4 204 U16 op_pmpermflags;
48c036b1 205 U8 op_pmdynflags;
79072805 206};
a0d0e21e 207
48c036b1 208#define PMdf_USED 0x01 /* pm has been used once already */
b3eb6a9b 209#define PMdf_TAINTED 0x02 /* pm compiled from tainted pattern */
48c036b1 210
b3eb6a9b 211#define PMf_RETAINT 0x0001 /* taint $1 etc. if target tainted */
a0d0e21e 212#define PMf_ONCE 0x0002 /* use pattern only once per reset */
c277df42 213#define PMf_REVERSED 0x0004 /* Should be matched right->left */
ce862d02 214#define PMf_MAYBE_CONST 0x0008 /* replacement contains variables */
a0d0e21e 215#define PMf_SKIPWHITE 0x0010 /* skip leading whitespace for split */
8782bef2 216#define PMf_WHITE 0x0020 /* pattern is \s+ */
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217#define PMf_CONST 0x0040 /* subst replacement is constant */
218#define PMf_KEEP 0x0080 /* keep 1st runtime pattern forever */
219#define PMf_GLOBAL 0x0100 /* pattern had a g modifier */
c90c0ff4 220#define PMf_CONTINUE 0x0200 /* don't reset pos() if //g fails */
a0d0e21e 221#define PMf_EVAL 0x0400 /* evaluating replacement as expr */
8782bef2 222#define PMf_LOCALE 0x0800 /* use locale for character types */
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223#define PMf_MULTILINE 0x1000 /* assume multiple lines */
224#define PMf_SINGLELINE 0x2000 /* assume single line */
8782bef2 225#define PMf_FOLD 0x4000 /* case insensitivity */
a0d0e21e 226#define PMf_EXTENDED 0x8000 /* chuck embedded whitespace */
79072805 227
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228/* mask of bits stored in regexp->reganch */
229#define PMf_COMPILETIME (PMf_MULTILINE|PMf_SINGLELINE|PMf_LOCALE|PMf_FOLD|PMf_EXTENDED)
230
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231struct svop {
232 BASEOP
233 SV * op_sv;
234};
235
236struct gvop {
237 BASEOP
238 GV * op_gv;
239};
240
241struct pvop {
242 BASEOP
243 char * op_pv;
244};
245
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246struct loop {
247 BASEOP
248 OP * op_first;
249 OP * op_last;
250 U32 op_children;
251 OP * op_redoop;
252 OP * op_nextop;
253 OP * op_lastop;
254};
255
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256#define cUNOP ((UNOP*)PL_op)
257#define cBINOP ((BINOP*)PL_op)
258#define cLISTOP ((LISTOP*)PL_op)
259#define cLOGOP ((LOGOP*)PL_op)
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260#define cPMOP ((PMOP*)PL_op)
261#define cSVOP ((SVOP*)PL_op)
262#define cGVOP ((GVOP*)PL_op)
263#define cPVOP ((PVOP*)PL_op)
264#define cCOP ((COP*)PL_op)
265#define cLOOP ((LOOP*)PL_op)
79072805 266
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267#define cUNOPo ((UNOP*)o)
268#define cBINOPo ((BINOP*)o)
269#define cLISTOPo ((LISTOP*)o)
270#define cLOGOPo ((LOGOP*)o)
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271#define cPMOPo ((PMOP*)o)
272#define cSVOPo ((SVOP*)o)
273#define cGVOPo ((GVOP*)o)
274#define cPVOPo ((PVOP*)o)
275#define cCVOPo ((CVOP*)o)
276#define cCOPo ((COP*)o)
277#define cLOOPo ((LOOP*)o)
278
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279#define kUNOP ((UNOP*)kid)
280#define kBINOP ((BINOP*)kid)
281#define kLISTOP ((LISTOP*)kid)
282#define kLOGOP ((LOGOP*)kid)
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283#define kPMOP ((PMOP*)kid)
284#define kSVOP ((SVOP*)kid)
285#define kGVOP ((GVOP*)kid)
286#define kPVOP ((PVOP*)kid)
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287#define kCOP ((COP*)kid)
288#define kLOOP ((LOOP*)kid)
289
290#define Nullop Null(OP*)
291
4369b173 292/* Lowest byte of PL_opargs */
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293#define OA_MARK 1
294#define OA_FOLDCONST 2
295#define OA_RETSCALAR 4
296#define OA_TARGET 8
297#define OA_RETINTEGER 16
298#define OA_OTHERINT 32
299#define OA_DANGEROUS 64
300#define OA_DEFGV 128
b162f9ea 301#define OA_TARGLEX 256
a0d0e21e 302
db173bac 303/* The next 4 bits encode op class information */
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304#define OCSHIFT 9
305
306#define OA_CLASS_MASK (15 << OCSHIFT)
307
308#define OA_BASEOP (0 << OCSHIFT)
309#define OA_UNOP (1 << OCSHIFT)
310#define OA_BINOP (2 << OCSHIFT)
311#define OA_LOGOP (3 << OCSHIFT)
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312#define OA_LISTOP (4 << OCSHIFT)
313#define OA_PMOP (5 << OCSHIFT)
314#define OA_SVOP (6 << OCSHIFT)
315#define OA_GVOP (7 << OCSHIFT)
316#define OA_PVOP_OR_SVOP (8 << OCSHIFT)
317#define OA_LOOP (9 << OCSHIFT)
318#define OA_COP (10 << OCSHIFT)
319#define OA_BASEOP_OR_UNOP (11 << OCSHIFT)
320#define OA_FILESTATOP (12 << OCSHIFT)
321#define OA_LOOPEXOP (13 << OCSHIFT)
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322
323#define OASHIFT 13
a0d0e21e 324
4369b173 325/* Remaining nybbles of PL_opargs */
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326#define OA_SCALAR 1
327#define OA_LIST 2
328#define OA_AVREF 3
329#define OA_HVREF 4
330#define OA_CVREF 5
331#define OA_FILEREF 6
332#define OA_SCALARREF 7
333#define OA_OPTIONAL 8
334