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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) \ |
50 | if (cx->blk_sub.hasargs) { /* put back old @_ */ \ |
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51 | GvAV(defgv) = cx->blk_sub.savearray; \ |
52 | } \ |
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53 | if (cx->blk_sub.cv) { \ |
54 | if (!(CvDEPTH(cx->blk_sub.cv) = cx->blk_sub.olddepth)) { \ |
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55 | SvREFCNT_dec((SV*)cx->blk_sub.cv); \ |
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56 | } \ |
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57 | } |
58 | |
59 | #define POPFORMAT(cx) \ |
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60 | setdefout(cx->blk_sub.dfoutgv); \ |
61 | SvREFCNT_dec(cx->blk_sub.dfoutgv); |
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62 | |
63 | /* eval context */ |
64 | struct block_eval { |
65 | I32 old_in_eval; |
66 | I32 old_op_type; |
67 | char * old_name; |
68 | OP * old_eval_root; |
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69 | SV * cur_text; |
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70 | }; |
71 | |
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72 | #define PUSHEVAL(cx,n,fgv) \ |
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73 | cx->blk_eval.old_in_eval = in_eval; \ |
74 | cx->blk_eval.old_op_type = op->op_type; \ |
75 | cx->blk_eval.old_name = n; \ |
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76 | cx->blk_eval.old_eval_root = eval_root; \ |
77 | cx->blk_eval.cur_text = linestr; |
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78 | |
79 | #define POPEVAL(cx) \ |
80 | in_eval = cx->blk_eval.old_in_eval; \ |
81 | optype = cx->blk_eval.old_op_type; \ |
82 | eval_root = cx->blk_eval.old_eval_root; |
83 | |
84 | /* loop context */ |
85 | struct block_loop { |
86 | char * label; |
87 | I32 resetsp; |
88 | OP * redo_op; |
89 | OP * next_op; |
90 | OP * last_op; |
91 | SV ** itervar; |
92 | SV * itersave; |
93 | AV * iterary; |
94 | I32 iterix; |
95 | }; |
96 | |
97 | #define PUSHLOOP(cx, ivar, s) \ |
98 | cx->blk_loop.label = curcop->cop_label; \ |
99 | cx->blk_loop.resetsp = s - stack_base; \ |
100 | cx->blk_loop.redo_op = cLOOP->op_redoop; \ |
101 | cx->blk_loop.next_op = cLOOP->op_nextop; \ |
102 | cx->blk_loop.last_op = cLOOP->op_lastop; \ |
103 | cx->blk_loop.itervar = ivar; \ |
104 | if (ivar) \ |
105 | cx->blk_loop.itersave = *cx->blk_loop.itervar; |
106 | |
107 | #define POPLOOP(cx) \ |
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108 | newsp = stack_base + cx->blk_loop.resetsp; |
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109 | |
110 | /* context common to subroutines, evals and loops */ |
111 | struct block { |
112 | I32 blku_oldsp; /* stack pointer to copy stuff down to */ |
113 | COP * blku_oldcop; /* old curcop pointer */ |
114 | I32 blku_oldretsp; /* return stack index */ |
115 | I32 blku_oldmarksp; /* mark stack index */ |
116 | I32 blku_oldscopesp; /* scope stack index */ |
117 | PMOP * blku_oldpm; /* values of pattern match vars */ |
118 | U8 blku_gimme; /* is this block running in list context? */ |
119 | |
120 | union { |
121 | struct block_sub blku_sub; |
122 | struct block_eval blku_eval; |
123 | struct block_loop blku_loop; |
124 | } blk_u; |
125 | }; |
126 | #define blk_oldsp cx_u.cx_blk.blku_oldsp |
127 | #define blk_oldcop cx_u.cx_blk.blku_oldcop |
128 | #define blk_oldretsp cx_u.cx_blk.blku_oldretsp |
129 | #define blk_oldmarksp cx_u.cx_blk.blku_oldmarksp |
130 | #define blk_oldscopesp cx_u.cx_blk.blku_oldscopesp |
131 | #define blk_oldpm cx_u.cx_blk.blku_oldpm |
132 | #define blk_gimme cx_u.cx_blk.blku_gimme |
133 | #define blk_sub cx_u.cx_blk.blk_u.blku_sub |
134 | #define blk_eval cx_u.cx_blk.blk_u.blku_eval |
135 | #define blk_loop cx_u.cx_blk.blk_u.blku_loop |
136 | |
137 | /* Enter a block. */ |
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138 | #define PUSHBLOCK(cx,t,sp) CXINC, cx = &cxstack[cxstack_ix], \ |
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139 | cx->cx_type = t, \ |
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140 | cx->blk_oldsp = sp - stack_base, \ |
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141 | cx->blk_oldcop = curcop, \ |
142 | cx->blk_oldmarksp = markstack_ptr - markstack, \ |
143 | cx->blk_oldscopesp = scopestack_ix, \ |
144 | cx->blk_oldretsp = retstack_ix, \ |
145 | cx->blk_oldpm = curpm, \ |
146 | cx->blk_gimme = gimme; \ |
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147 | DEBUG_l( fprintf(stderr,"Entering block %ld, type %s\n", \ |
148 | (long)cxstack_ix, block_type[t]); ) |
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149 | |
150 | /* Exit a block (RETURN and LAST). */ |
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151 | #define POPBLOCK(cx,pm) cx = &cxstack[cxstack_ix--], \ |
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152 | newsp = stack_base + cx->blk_oldsp, \ |
153 | curcop = cx->blk_oldcop, \ |
154 | markstack_ptr = markstack + cx->blk_oldmarksp, \ |
155 | scopestack_ix = cx->blk_oldscopesp, \ |
156 | retstack_ix = cx->blk_oldretsp, \ |
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157 | pm = cx->blk_oldpm, \ |
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158 | gimme = cx->blk_gimme; \ |
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159 | DEBUG_l( fprintf(stderr,"Leaving block %ld, type %s\n", \ |
160 | (long)cxstack_ix+1,block_type[cx->cx_type]); ) |
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161 | |
162 | /* Continue a block elsewhere (NEXT and REDO). */ |
163 | #define TOPBLOCK(cx) cx = &cxstack[cxstack_ix], \ |
164 | stack_sp = stack_base + cx->blk_oldsp, \ |
165 | markstack_ptr = markstack + cx->blk_oldmarksp, \ |
166 | scopestack_ix = cx->blk_oldscopesp, \ |
167 | retstack_ix = cx->blk_oldretsp |
168 | |
169 | /* substitution context */ |
170 | struct subst { |
171 | I32 sbu_iters; |
172 | I32 sbu_maxiters; |
173 | I32 sbu_safebase; |
174 | I32 sbu_once; |
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175 | I32 sbu_oldsave; |
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176 | char * sbu_orig; |
177 | SV * sbu_dstr; |
178 | SV * sbu_targ; |
179 | char * sbu_s; |
180 | char * sbu_m; |
181 | char * sbu_strend; |
182 | char * sbu_subbase; |
183 | }; |
184 | #define sb_iters cx_u.cx_subst.sbu_iters |
185 | #define sb_maxiters cx_u.cx_subst.sbu_maxiters |
186 | #define sb_safebase cx_u.cx_subst.sbu_safebase |
187 | #define sb_once cx_u.cx_subst.sbu_once |
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188 | #define sb_oldsave cx_u.cx_subst.sbu_oldsave |
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189 | #define sb_orig cx_u.cx_subst.sbu_orig |
190 | #define sb_dstr cx_u.cx_subst.sbu_dstr |
191 | #define sb_targ cx_u.cx_subst.sbu_targ |
192 | #define sb_s cx_u.cx_subst.sbu_s |
193 | #define sb_m cx_u.cx_subst.sbu_m |
194 | #define sb_strend cx_u.cx_subst.sbu_strend |
195 | #define sb_subbase cx_u.cx_subst.sbu_subbase |
196 | |
197 | #define PUSHSUBST(cx) CXINC, cx = &cxstack[cxstack_ix], \ |
198 | cx->sb_iters = iters, \ |
199 | cx->sb_maxiters = maxiters, \ |
200 | cx->sb_safebase = safebase, \ |
201 | cx->sb_once = once, \ |
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202 | cx->sb_oldsave = oldsave, \ |
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203 | cx->sb_orig = orig, \ |
204 | cx->sb_dstr = dstr, \ |
205 | cx->sb_targ = targ, \ |
206 | cx->sb_s = s, \ |
207 | cx->sb_m = m, \ |
208 | cx->sb_strend = strend, \ |
209 | cx->cx_type = CXt_SUBST |
210 | |
211 | #define POPSUBST(cx) cxstack_ix-- |
212 | |
213 | struct context { |
214 | I32 cx_type; /* what kind of context this is */ |
215 | union { |
216 | struct block cx_blk; |
217 | struct subst cx_subst; |
218 | } cx_u; |
219 | }; |
220 | #define CXt_NULL 0 |
221 | #define CXt_SUB 1 |
222 | #define CXt_EVAL 2 |
223 | #define CXt_LOOP 3 |
224 | #define CXt_SUBST 4 |
225 | #define CXt_BLOCK 5 |
226 | |
227 | #define CXINC (cxstack_ix < cxstack_max ? ++cxstack_ix : (cxstack_ix = cxinc())) |
228 | |
229 | /* "gimme" values */ |
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230 | #define G_SCALAR 0 |
231 | #define G_ARRAY 1 |
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232 | |
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233 | /* extra flags for perl_call_* routines */ |
234 | #define G_DISCARD 2 /* Call FREETMPS. */ |
235 | #define G_EVAL 4 /* Assume eval {} around subroutine call. */ |
236 | #define G_NOARGS 8 /* Don't construct a @_ array. */ |
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237 | #define G_KEEPERR 16 /* Append errors to $@ rather than overwriting it */ |