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79072805 |
1 | /* $RCSfile: cmd.h,v $$Revision: 4.1 $$Date: 92/08/07 17:19:19 $ |
2 | * |
3 | * Copyright (c) 1991, Larry Wall |
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 | * |
8 | * $Log: cmd.h,v $ |
9 | * Revision 4.1 92/08/07 17:19:19 lwall |
10 | * Stage 6 Snapshot |
11 | * |
12 | * Revision 4.0.1.2 92/06/08 12:01:02 lwall |
13 | * patch20: removed implicit int declarations on funcions |
14 | * |
15 | * Revision 4.0.1.1 91/06/07 10:28:50 lwall |
16 | * patch4: new copyright notice |
17 | * patch4: length($`), length($&), length($') now optimized to avoid string copy |
18 | * |
19 | * Revision 4.0 91/03/20 01:04:34 lwall |
20 | * 4.0 baseline. |
21 | * |
22 | */ |
23 | |
24 | struct acop { |
25 | GV *acop_gv; /* a symbol table entry */ |
26 | OP *acop_expr; /* any associated expression */ |
27 | }; |
28 | |
29 | struct ccop { |
30 | OP *ccop_true; /* normal code to do on if and while */ |
31 | OP *ccop_alt; /* else cmd ptr or continue code */ |
32 | }; |
33 | |
34 | struct scop { |
35 | OP **scop_next; /* array of pointers to commands */ |
36 | short scop_offset; /* first value - 1 */ |
37 | short scop_max; /* last value + 1 */ |
38 | }; |
39 | |
40 | struct cop { |
41 | BASEOP |
42 | OP *cop_expr; /* conditional expression */ |
43 | OP *cop_head; /* head of this command list */ |
44 | SV *cop_short; /* string to match as shortcut */ |
45 | GV *cop_gv; /* a symbol table entry, mostly for fp */ |
46 | char *cop_label; /* label for this construct */ |
47 | union uop { |
48 | struct acop acop; /* normal command */ |
49 | struct ccop ccop; /* compound command */ |
50 | struct scop scop; /* switch command */ |
51 | } uop; |
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52 | U32 cop_seq; /* parse sequence number */ |
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53 | short cop_slen; /* len of cop_short, if not null */ |
54 | VOL short cop_flags; /* optimization flags--see above */ |
55 | HV * cop_stash; /* package line was compiled in */ |
56 | GV * cop_filegv; /* file the following line # is from */ |
57 | line_t cop_line; /* line # of this command */ |
58 | char cop_type; /* what this command does */ |
59 | }; |
60 | |
61 | #define Nullcop Null(COP*) |
62 | |
63 | /* |
64 | * Here we have some enormously heavy (or at least ponderous) wizardry. |
65 | */ |
66 | |
67 | /* subroutine context */ |
68 | struct block_sub { |
69 | CV * cv; |
70 | GV * gv; |
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71 | GV * dfoutgv; |
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72 | AV * savearray; |
73 | AV * argarray; |
74 | U16 olddepth; |
75 | U8 hasargs; |
76 | }; |
77 | |
78 | #define PUSHSUB(cx) \ |
79 | cx->blk_sub.cv = cv; \ |
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80 | cx->blk_sub.olddepth = CvDEPTH(cv); \ |
81 | cx->blk_sub.hasargs = hasargs; |
82 | |
83 | #define PUSHFORMAT(cx) \ |
84 | cx->blk_sub.cv = cv; \ |
85 | cx->blk_sub.gv = gv; \ |
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86 | cx->blk_sub.dfoutgv = defoutgv; \ |
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87 | cx->blk_sub.hasargs = 0; |
88 | |
89 | #define POPSUB(cx) \ |
90 | if (cx->blk_sub.hasargs) { /* put back old @_ */ \ |
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91 | GvAV(defgv) = cx->blk_sub.savearray; \ |
92 | } \ |
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93 | if (cx->blk_sub.cv) { \ |
94 | if (!(CvDEPTH(cx->blk_sub.cv) = cx->blk_sub.olddepth)) { \ |
95 | if (CvDELETED(cx->blk_sub.cv)) \ |
96 | SvREFCNT_dec((SV*)cx->blk_sub.cv); \ |
97 | } \ |
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98 | } |
99 | |
100 | #define POPFORMAT(cx) \ |
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101 | defoutgv = cx->blk_sub.dfoutgv; |
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102 | |
103 | /* eval context */ |
104 | struct block_eval { |
105 | I32 old_in_eval; |
106 | I32 old_op_type; |
107 | char * old_name; |
108 | OP * old_eval_root; |
109 | }; |
110 | |
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111 | #define PUSHEVAL(cx,n,fgv) \ |
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112 | cx->blk_eval.old_in_eval = in_eval; \ |
113 | cx->blk_eval.old_op_type = op->op_type; \ |
114 | cx->blk_eval.old_name = n; \ |
115 | cx->blk_eval.old_eval_root = eval_root; |
116 | |
117 | #define POPEVAL(cx) \ |
118 | in_eval = cx->blk_eval.old_in_eval; \ |
119 | optype = cx->blk_eval.old_op_type; \ |
120 | eval_root = cx->blk_eval.old_eval_root; |
121 | |
122 | /* loop context */ |
123 | struct block_loop { |
124 | char * label; |
125 | I32 resetsp; |
126 | OP * redo_op; |
127 | OP * next_op; |
128 | OP * last_op; |
129 | SV ** itervar; |
130 | SV * itersave; |
131 | AV * iterary; |
132 | I32 iterix; |
133 | }; |
134 | |
135 | #define PUSHLOOP(cx, ivar, s) \ |
136 | cx->blk_loop.label = curcop->cop_label; \ |
137 | cx->blk_loop.resetsp = s - stack_base; \ |
138 | cx->blk_loop.redo_op = cLOOP->op_redoop; \ |
139 | cx->blk_loop.next_op = cLOOP->op_nextop; \ |
140 | cx->blk_loop.last_op = cLOOP->op_lastop; \ |
141 | cx->blk_loop.itervar = ivar; \ |
142 | if (ivar) \ |
143 | cx->blk_loop.itersave = *cx->blk_loop.itervar; |
144 | |
145 | #define POPLOOP(cx) \ |
146 | newsp = stack_base + cx->blk_loop.resetsp; \ |
147 | if (cx->blk_loop.itervar) \ |
148 | *cx->blk_loop.itervar = cx->blk_loop.itersave; |
149 | |
150 | /* context common to subroutines, evals and loops */ |
151 | struct block { |
152 | I32 blku_oldsp; /* stack pointer to copy stuff down to */ |
153 | COP * blku_oldcop; /* old curcop pointer */ |
154 | I32 blku_oldretsp; /* return stack index */ |
155 | I32 blku_oldmarksp; /* mark stack index */ |
156 | I32 blku_oldscopesp; /* scope stack index */ |
157 | PMOP * blku_oldpm; /* values of pattern match vars */ |
158 | U8 blku_gimme; /* is this block running in list context? */ |
159 | |
160 | union { |
161 | struct block_sub blku_sub; |
162 | struct block_eval blku_eval; |
163 | struct block_loop blku_loop; |
164 | } blk_u; |
165 | }; |
166 | #define blk_oldsp cx_u.cx_blk.blku_oldsp |
167 | #define blk_oldcop cx_u.cx_blk.blku_oldcop |
168 | #define blk_oldretsp cx_u.cx_blk.blku_oldretsp |
169 | #define blk_oldmarksp cx_u.cx_blk.blku_oldmarksp |
170 | #define blk_oldscopesp cx_u.cx_blk.blku_oldscopesp |
171 | #define blk_oldpm cx_u.cx_blk.blku_oldpm |
172 | #define blk_gimme cx_u.cx_blk.blku_gimme |
173 | #define blk_sub cx_u.cx_blk.blk_u.blku_sub |
174 | #define blk_eval cx_u.cx_blk.blk_u.blku_eval |
175 | #define blk_loop cx_u.cx_blk.blk_u.blku_loop |
176 | |
177 | /* Enter a block. */ |
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178 | #define PUSHBLOCK(cx,t,sp) CXINC, cx = &cxstack[cxstack_ix], \ |
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179 | cx->cx_type = t, \ |
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180 | cx->blk_oldsp = sp - stack_base, \ |
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181 | cx->blk_oldcop = curcop, \ |
182 | cx->blk_oldmarksp = markstack_ptr - markstack, \ |
183 | cx->blk_oldscopesp = scopestack_ix, \ |
184 | cx->blk_oldretsp = retstack_ix, \ |
185 | cx->blk_oldpm = curpm, \ |
186 | cx->blk_gimme = gimme; \ |
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187 | DEBUG_l( fprintf(stderr,"Entering block %d, type %s\n", \ |
188 | cxstack_ix, block_type[t]); ) |
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189 | |
190 | /* Exit a block (RETURN and LAST). */ |
191 | #define POPBLOCK(cx) cx = &cxstack[cxstack_ix--], \ |
192 | newsp = stack_base + cx->blk_oldsp, \ |
193 | curcop = cx->blk_oldcop, \ |
194 | markstack_ptr = markstack + cx->blk_oldmarksp, \ |
195 | scopestack_ix = cx->blk_oldscopesp, \ |
196 | retstack_ix = cx->blk_oldretsp, \ |
197 | curpm = cx->blk_oldpm, \ |
198 | gimme = cx->blk_gimme; \ |
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199 | DEBUG_l( fprintf(stderr,"Leaving block %d, type %s\n", \ |
200 | cxstack_ix+1,block_type[cx->cx_type]); ) |
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201 | |
202 | /* Continue a block elsewhere (NEXT and REDO). */ |
203 | #define TOPBLOCK(cx) cx = &cxstack[cxstack_ix], \ |
204 | stack_sp = stack_base + cx->blk_oldsp, \ |
205 | markstack_ptr = markstack + cx->blk_oldmarksp, \ |
206 | scopestack_ix = cx->blk_oldscopesp, \ |
207 | retstack_ix = cx->blk_oldretsp |
208 | |
209 | /* substitution context */ |
210 | struct subst { |
211 | I32 sbu_iters; |
212 | I32 sbu_maxiters; |
213 | I32 sbu_safebase; |
214 | I32 sbu_once; |
215 | char * sbu_orig; |
216 | SV * sbu_dstr; |
217 | SV * sbu_targ; |
218 | char * sbu_s; |
219 | char * sbu_m; |
220 | char * sbu_strend; |
221 | char * sbu_subbase; |
222 | }; |
223 | #define sb_iters cx_u.cx_subst.sbu_iters |
224 | #define sb_maxiters cx_u.cx_subst.sbu_maxiters |
225 | #define sb_safebase cx_u.cx_subst.sbu_safebase |
226 | #define sb_once cx_u.cx_subst.sbu_once |
227 | #define sb_orig cx_u.cx_subst.sbu_orig |
228 | #define sb_dstr cx_u.cx_subst.sbu_dstr |
229 | #define sb_targ cx_u.cx_subst.sbu_targ |
230 | #define sb_s cx_u.cx_subst.sbu_s |
231 | #define sb_m cx_u.cx_subst.sbu_m |
232 | #define sb_strend cx_u.cx_subst.sbu_strend |
233 | #define sb_subbase cx_u.cx_subst.sbu_subbase |
234 | |
235 | #define PUSHSUBST(cx) CXINC, cx = &cxstack[cxstack_ix], \ |
236 | cx->sb_iters = iters, \ |
237 | cx->sb_maxiters = maxiters, \ |
238 | cx->sb_safebase = safebase, \ |
239 | cx->sb_once = once, \ |
240 | cx->sb_orig = orig, \ |
241 | cx->sb_dstr = dstr, \ |
242 | cx->sb_targ = targ, \ |
243 | cx->sb_s = s, \ |
244 | cx->sb_m = m, \ |
245 | cx->sb_strend = strend, \ |
246 | cx->cx_type = CXt_SUBST |
247 | |
248 | #define POPSUBST(cx) cxstack_ix-- |
249 | |
250 | struct context { |
251 | I32 cx_type; /* what kind of context this is */ |
252 | union { |
253 | struct block cx_blk; |
254 | struct subst cx_subst; |
255 | } cx_u; |
256 | }; |
257 | #define CXt_NULL 0 |
258 | #define CXt_SUB 1 |
259 | #define CXt_EVAL 2 |
260 | #define CXt_LOOP 3 |
261 | #define CXt_SUBST 4 |
262 | #define CXt_BLOCK 5 |
263 | |
264 | #define CXINC (cxstack_ix < cxstack_max ? ++cxstack_ix : (cxstack_ix = cxinc())) |
265 | |
266 | /* "gimme" values */ |
267 | #define G_SCALAR 0 |
268 | #define G_ARRAY 1 |
269 | |