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1 | /* cop.h |
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2 | * |
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3 | * Copyright (c) 1991-1994, 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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10 | struct cop { |
11 | BASEOP |
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12 | char * cop_label; /* label for this construct */ |
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13 | HV * cop_stash; /* package line was compiled in */ |
14 | GV * cop_filegv; /* file the following line # is from */ |
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15 | U32 cop_seq; /* parse sequence number */ |
16 | I32 cop_arybase; /* array base this line was compiled with */ |
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17 | line_t cop_line; /* line # of this command */ |
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18 | }; |
19 | |
20 | #define Nullcop Null(COP*) |
21 | |
22 | /* |
23 | * Here we have some enormously heavy (or at least ponderous) wizardry. |
24 | */ |
25 | |
26 | /* subroutine context */ |
27 | struct block_sub { |
28 | CV * cv; |
29 | GV * gv; |
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30 | GV * dfoutgv; |
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31 | AV * savearray; |
32 | AV * argarray; |
33 | U16 olddepth; |
34 | U8 hasargs; |
35 | }; |
36 | |
37 | #define PUSHSUB(cx) \ |
38 | cx->blk_sub.cv = cv; \ |
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39 | cx->blk_sub.olddepth = CvDEPTH(cv); \ |
40 | cx->blk_sub.hasargs = hasargs; |
41 | |
42 | #define PUSHFORMAT(cx) \ |
43 | cx->blk_sub.cv = cv; \ |
44 | cx->blk_sub.gv = gv; \ |
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45 | cx->blk_sub.hasargs = 0; \ |
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46 | cx->blk_sub.dfoutgv = defoutgv; \ |
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47 | (void)SvREFCNT_inc(cx->blk_sub.dfoutgv) |
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48 | |
49 | #define POPSUB(cx) \ |
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50 | { struct block_sub cxsub; \ |
51 | POPSUB1(cx); \ |
52 | POPSUB2(); } |
53 | |
54 | #define POPSUB1(cx) \ |
55 | cxsub = cx->blk_sub; /* because DESTROY may clobber *cx */ |
56 | |
57 | #define POPSUB2() \ |
58 | if (cxsub.hasargs) { \ |
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59 | /* put back old @_ */ \ |
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60 | SvREFCNT_dec(GvAV(defgv)); \ |
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61 | GvAV(defgv) = cxsub.savearray; \ |
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62 | /* destroy arg array */ \ |
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63 | av_clear(cxsub.argarray); \ |
64 | AvREAL_off(cxsub.argarray); \ |
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65 | } \ |
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66 | if (cxsub.cv) { \ |
67 | if (!(CvDEPTH(cxsub.cv) = cxsub.olddepth)) \ |
68 | SvREFCNT_dec(cxsub.cv); \ |
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69 | } |
70 | |
71 | #define POPFORMAT(cx) \ |
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72 | setdefout(cx->blk_sub.dfoutgv); \ |
73 | SvREFCNT_dec(cx->blk_sub.dfoutgv); |
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74 | |
75 | /* eval context */ |
76 | struct block_eval { |
77 | I32 old_in_eval; |
78 | I32 old_op_type; |
79 | char * old_name; |
80 | OP * old_eval_root; |
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81 | SV * cur_text; |
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82 | }; |
83 | |
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84 | #define PUSHEVAL(cx,n,fgv) \ |
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85 | cx->blk_eval.old_in_eval = in_eval; \ |
86 | cx->blk_eval.old_op_type = op->op_type; \ |
87 | cx->blk_eval.old_name = n; \ |
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88 | cx->blk_eval.old_eval_root = eval_root; \ |
89 | cx->blk_eval.cur_text = linestr; |
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90 | |
91 | #define POPEVAL(cx) \ |
92 | in_eval = cx->blk_eval.old_in_eval; \ |
93 | optype = cx->blk_eval.old_op_type; \ |
94 | eval_root = cx->blk_eval.old_eval_root; |
95 | |
96 | /* loop context */ |
97 | struct block_loop { |
98 | char * label; |
99 | I32 resetsp; |
100 | OP * redo_op; |
101 | OP * next_op; |
102 | OP * last_op; |
103 | SV ** itervar; |
104 | SV * itersave; |
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105 | SV * iterlval; |
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106 | AV * iterary; |
107 | I32 iterix; |
108 | }; |
109 | |
110 | #define PUSHLOOP(cx, ivar, s) \ |
111 | cx->blk_loop.label = curcop->cop_label; \ |
112 | cx->blk_loop.resetsp = s - stack_base; \ |
113 | cx->blk_loop.redo_op = cLOOP->op_redoop; \ |
114 | cx->blk_loop.next_op = cLOOP->op_nextop; \ |
115 | cx->blk_loop.last_op = cLOOP->op_lastop; \ |
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116 | if (cx->blk_loop.itervar = (ivar)) \ |
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117 | cx->blk_loop.itersave = SvREFCNT_inc(*cx->blk_loop.itervar);\ |
118 | cx->blk_loop.iterlval = Nullsv; \ |
119 | cx->blk_loop.iterary = Nullav; \ |
120 | cx->blk_loop.iterix = -1; |
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121 | |
122 | #define POPLOOP(cx) \ |
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123 | { struct block_loop cxloop; \ |
124 | POPLOOP1(cx); \ |
125 | POPLOOP2(); } |
126 | |
127 | #define POPLOOP1(cx) \ |
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128 | cxloop = cx->blk_loop; /* because DESTROY may clobber *cx */ \ |
129 | newsp = stack_base + cxloop.resetsp; |
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130 | |
131 | #define POPLOOP2() \ |
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132 | SvREFCNT_dec(cxloop.iterlval); \ |
133 | if (cxloop.itervar) { \ |
134 | SvREFCNT_dec(*cxloop.itervar); \ |
135 | *cxloop.itervar = cxloop.itersave; \ |
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136 | } \ |
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137 | if (cxloop.iterary && cxloop.iterary != curstack) \ |
138 | SvREFCNT_dec(cxloop.iterary); |
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139 | |
140 | /* context common to subroutines, evals and loops */ |
141 | struct block { |
142 | I32 blku_oldsp; /* stack pointer to copy stuff down to */ |
143 | COP * blku_oldcop; /* old curcop pointer */ |
144 | I32 blku_oldretsp; /* return stack index */ |
145 | I32 blku_oldmarksp; /* mark stack index */ |
146 | I32 blku_oldscopesp; /* scope stack index */ |
147 | PMOP * blku_oldpm; /* values of pattern match vars */ |
148 | U8 blku_gimme; /* is this block running in list context? */ |
149 | |
150 | union { |
151 | struct block_sub blku_sub; |
152 | struct block_eval blku_eval; |
153 | struct block_loop blku_loop; |
154 | } blk_u; |
155 | }; |
156 | #define blk_oldsp cx_u.cx_blk.blku_oldsp |
157 | #define blk_oldcop cx_u.cx_blk.blku_oldcop |
158 | #define blk_oldretsp cx_u.cx_blk.blku_oldretsp |
159 | #define blk_oldmarksp cx_u.cx_blk.blku_oldmarksp |
160 | #define blk_oldscopesp cx_u.cx_blk.blku_oldscopesp |
161 | #define blk_oldpm cx_u.cx_blk.blku_oldpm |
162 | #define blk_gimme cx_u.cx_blk.blku_gimme |
163 | #define blk_sub cx_u.cx_blk.blk_u.blku_sub |
164 | #define blk_eval cx_u.cx_blk.blk_u.blku_eval |
165 | #define blk_loop cx_u.cx_blk.blk_u.blku_loop |
166 | |
167 | /* Enter a block. */ |
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168 | #define PUSHBLOCK(cx,t,sp) CXINC, cx = &cxstack[cxstack_ix], \ |
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169 | cx->cx_type = t, \ |
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170 | cx->blk_oldsp = sp - stack_base, \ |
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171 | cx->blk_oldcop = curcop, \ |
172 | cx->blk_oldmarksp = markstack_ptr - markstack, \ |
173 | cx->blk_oldscopesp = scopestack_ix, \ |
174 | cx->blk_oldretsp = retstack_ix, \ |
175 | cx->blk_oldpm = curpm, \ |
176 | cx->blk_gimme = gimme; \ |
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177 | DEBUG_l( PerlIO_printf(PerlIO_stderr(), "Entering block %ld, type %s\n", \ |
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178 | (long)cxstack_ix, block_type[t]); ) |
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179 | |
180 | /* Exit a block (RETURN and LAST). */ |
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181 | #define POPBLOCK(cx,pm) cx = &cxstack[cxstack_ix--], \ |
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182 | newsp = stack_base + cx->blk_oldsp, \ |
183 | curcop = cx->blk_oldcop, \ |
184 | markstack_ptr = markstack + cx->blk_oldmarksp, \ |
185 | scopestack_ix = cx->blk_oldscopesp, \ |
186 | retstack_ix = cx->blk_oldretsp, \ |
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187 | pm = cx->blk_oldpm, \ |
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188 | gimme = cx->blk_gimme; \ |
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189 | DEBUG_l( PerlIO_printf(PerlIO_stderr(), "Leaving block %ld, type %s\n", \ |
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190 | (long)cxstack_ix+1,block_type[cx->cx_type]); ) |
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191 | |
192 | /* Continue a block elsewhere (NEXT and REDO). */ |
193 | #define TOPBLOCK(cx) cx = &cxstack[cxstack_ix], \ |
194 | stack_sp = stack_base + cx->blk_oldsp, \ |
195 | markstack_ptr = markstack + cx->blk_oldmarksp, \ |
196 | scopestack_ix = cx->blk_oldscopesp, \ |
197 | retstack_ix = cx->blk_oldretsp |
198 | |
199 | /* substitution context */ |
200 | struct subst { |
201 | I32 sbu_iters; |
202 | I32 sbu_maxiters; |
203 | I32 sbu_safebase; |
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204 | I32 sbu_oldsave; |
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205 | bool sbu_once; |
206 | bool sbu_rxtainted; |
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207 | char * sbu_orig; |
208 | SV * sbu_dstr; |
209 | SV * sbu_targ; |
210 | char * sbu_s; |
211 | char * sbu_m; |
212 | char * sbu_strend; |
213 | char * sbu_subbase; |
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214 | REGEXP * sbu_rx; |
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215 | }; |
216 | #define sb_iters cx_u.cx_subst.sbu_iters |
217 | #define sb_maxiters cx_u.cx_subst.sbu_maxiters |
218 | #define sb_safebase cx_u.cx_subst.sbu_safebase |
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219 | #define sb_oldsave cx_u.cx_subst.sbu_oldsave |
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220 | #define sb_once cx_u.cx_subst.sbu_once |
221 | #define sb_rxtainted cx_u.cx_subst.sbu_rxtainted |
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222 | #define sb_orig cx_u.cx_subst.sbu_orig |
223 | #define sb_dstr cx_u.cx_subst.sbu_dstr |
224 | #define sb_targ cx_u.cx_subst.sbu_targ |
225 | #define sb_s cx_u.cx_subst.sbu_s |
226 | #define sb_m cx_u.cx_subst.sbu_m |
227 | #define sb_strend cx_u.cx_subst.sbu_strend |
228 | #define sb_subbase cx_u.cx_subst.sbu_subbase |
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229 | #define sb_rx cx_u.cx_subst.sbu_rx |
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230 | |
231 | #define PUSHSUBST(cx) CXINC, cx = &cxstack[cxstack_ix], \ |
232 | cx->sb_iters = iters, \ |
233 | cx->sb_maxiters = maxiters, \ |
234 | cx->sb_safebase = safebase, \ |
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235 | cx->sb_oldsave = oldsave, \ |
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236 | cx->sb_once = once, \ |
237 | cx->sb_rxtainted = rxtainted, \ |
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238 | cx->sb_orig = orig, \ |
239 | cx->sb_dstr = dstr, \ |
240 | cx->sb_targ = targ, \ |
241 | cx->sb_s = s, \ |
242 | cx->sb_m = m, \ |
243 | cx->sb_strend = strend, \ |
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244 | cx->sb_rx = rx, \ |
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245 | cx->cx_type = CXt_SUBST |
246 | |
247 | #define POPSUBST(cx) cxstack_ix-- |
248 | |
249 | struct context { |
250 | I32 cx_type; /* what kind of context this is */ |
251 | union { |
252 | struct block cx_blk; |
253 | struct subst cx_subst; |
254 | } cx_u; |
255 | }; |
256 | #define CXt_NULL 0 |
257 | #define CXt_SUB 1 |
258 | #define CXt_EVAL 2 |
259 | #define CXt_LOOP 3 |
260 | #define CXt_SUBST 4 |
261 | #define CXt_BLOCK 5 |
262 | |
263 | #define CXINC (cxstack_ix < cxstack_max ? ++cxstack_ix : (cxstack_ix = cxinc())) |
264 | |
265 | /* "gimme" values */ |
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266 | #define G_SCALAR 0 |
267 | #define G_ARRAY 1 |
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268 | |
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269 | /* extra flags for perl_call_* routines */ |
270 | #define G_DISCARD 2 /* Call FREETMPS. */ |
271 | #define G_EVAL 4 /* Assume eval {} around subroutine call. */ |
272 | #define G_NOARGS 8 /* Don't construct a @_ array. */ |
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273 | #define G_KEEPERR 16 /* Append errors to $@ rather than overwriting it */ |