1 /* $RCSfile: cmd.h,v $$Revision: 4.1 $$Date: 92/08/07 17:19:19 $
3 * Copyright (c) 1991, Larry Wall
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.
9 * Revision 4.1 92/08/07 17:19:19 lwall
12 * Revision 4.0.1.2 92/06/08 12:01:02 lwall
13 * patch20: removed implicit int declarations on funcions
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
19 * Revision 4.0 91/03/20 01:04:34 lwall
25 GV *acop_gv; /* a symbol table entry */
26 OP *acop_expr; /* any associated expression */
30 OP *ccop_true; /* normal code to do on if and while */
31 OP *ccop_alt; /* else cmd ptr or continue code */
35 OP **scop_next; /* array of pointers to commands */
36 short scop_offset; /* first value - 1 */
37 short scop_max; /* last value + 1 */
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 */
48 struct acop acop; /* normal command */
49 struct ccop ccop; /* compound command */
50 struct scop scop; /* switch command */
52 U32 cop_seq; /* parse sequence number */
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 */
61 #define Nullcop Null(COP*)
64 * Here we have some enormously heavy (or at least ponderous) wizardry.
67 /* subroutine context */
79 cx->blk_sub.cv = cv; \
80 cx->blk_sub.olddepth = CvDEPTH(cv); \
81 cx->blk_sub.hasargs = hasargs;
83 #define PUSHFORMAT(cx) \
84 cx->blk_sub.cv = cv; \
85 cx->blk_sub.gv = gv; \
86 cx->blk_sub.dfoutgv = defoutgv; \
87 cx->blk_sub.hasargs = 0;
90 if (cx->blk_sub.hasargs) { /* put back old @_ */ \
91 GvAV(defgv) = cx->blk_sub.savearray; \
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); \
100 #define POPFORMAT(cx) \
101 defoutgv = cx->blk_sub.dfoutgv;
111 #define PUSHEVAL(cx,n,fgv) \
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;
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;
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; \
143 cx->blk_loop.itersave = *cx->blk_loop.itervar;
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;
150 /* context common to subroutines, evals and loops */
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? */
161 struct block_sub blku_sub;
162 struct block_eval blku_eval;
163 struct block_loop blku_loop;
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
178 #define PUSHBLOCK(cx,t,sp) CXINC, cx = &cxstack[cxstack_ix], \
180 cx->blk_oldsp = sp - stack_base, \
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; \
187 DEBUG_l( fprintf(stderr,"Entering block %d, type %s\n", \
188 cxstack_ix, block_type[t]); )
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; \
199 DEBUG_l( fprintf(stderr,"Leaving block %d, type %s\n", \
200 cxstack_ix+1,block_type[cx->cx_type]); )
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
209 /* substitution context */
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
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, \
245 cx->sb_strend = strend, \
246 cx->cx_type = CXt_SUBST
248 #define POPSUBST(cx) cxstack_ix--
251 I32 cx_type; /* what kind of context this is */
254 struct subst cx_subst;
264 #define CXINC (cxstack_ix < cxstack_max ? ++cxstack_ix : (cxstack_ix = cxinc()))