| 1 | /* cop.h |
| 2 | * |
| 3 | * Copyright (c) 1991-1994, 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 | */ |
| 9 | |
| 10 | struct cop { |
| 11 | BASEOP |
| 12 | char * cop_label; /* label for this construct */ |
| 13 | HV * cop_stash; /* package line was compiled in */ |
| 14 | GV * cop_filegv; /* file the following line # is from */ |
| 15 | U32 cop_seq; /* parse sequence number */ |
| 16 | I32 cop_arybase; /* array base this line was compiled with */ |
| 17 | line_t cop_line; /* line # of this command */ |
| 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; |
| 30 | GV * dfoutgv; |
| 31 | AV * savearray; |
| 32 | AV * argarray; |
| 33 | U16 olddepth; |
| 34 | U8 hasargs; |
| 35 | }; |
| 36 | |
| 37 | #define PUSHSUB(cx) \ |
| 38 | cx->blk_sub.cv = cv; \ |
| 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; \ |
| 45 | cx->blk_sub.dfoutgv = defoutgv; \ |
| 46 | cx->blk_sub.hasargs = 0; |
| 47 | |
| 48 | #define POPSUB(cx) \ |
| 49 | if (cx->blk_sub.hasargs) { /* put back old @_ */ \ |
| 50 | GvAV(defgv) = cx->blk_sub.savearray; \ |
| 51 | } \ |
| 52 | if (cx->blk_sub.cv) { \ |
| 53 | if (!(CvDEPTH(cx->blk_sub.cv) = cx->blk_sub.olddepth)) { \ |
| 54 | SvREFCNT_dec((SV*)cx->blk_sub.cv); \ |
| 55 | } \ |
| 56 | } |
| 57 | |
| 58 | #define POPFORMAT(cx) \ |
| 59 | defoutgv = cx->blk_sub.dfoutgv; |
| 60 | |
| 61 | /* eval context */ |
| 62 | struct block_eval { |
| 63 | I32 old_in_eval; |
| 64 | I32 old_op_type; |
| 65 | char * old_name; |
| 66 | OP * old_eval_root; |
| 67 | }; |
| 68 | |
| 69 | #define PUSHEVAL(cx,n,fgv) \ |
| 70 | cx->blk_eval.old_in_eval = in_eval; \ |
| 71 | cx->blk_eval.old_op_type = op->op_type; \ |
| 72 | cx->blk_eval.old_name = n; \ |
| 73 | cx->blk_eval.old_eval_root = eval_root; |
| 74 | |
| 75 | #define POPEVAL(cx) \ |
| 76 | in_eval = cx->blk_eval.old_in_eval; \ |
| 77 | optype = cx->blk_eval.old_op_type; \ |
| 78 | eval_root = cx->blk_eval.old_eval_root; |
| 79 | |
| 80 | /* loop context */ |
| 81 | struct block_loop { |
| 82 | char * label; |
| 83 | I32 resetsp; |
| 84 | OP * redo_op; |
| 85 | OP * next_op; |
| 86 | OP * last_op; |
| 87 | SV ** itervar; |
| 88 | SV * itersave; |
| 89 | AV * iterary; |
| 90 | I32 iterix; |
| 91 | }; |
| 92 | |
| 93 | #define PUSHLOOP(cx, ivar, s) \ |
| 94 | cx->blk_loop.label = curcop->cop_label; \ |
| 95 | cx->blk_loop.resetsp = s - stack_base; \ |
| 96 | cx->blk_loop.redo_op = cLOOP->op_redoop; \ |
| 97 | cx->blk_loop.next_op = cLOOP->op_nextop; \ |
| 98 | cx->blk_loop.last_op = cLOOP->op_lastop; \ |
| 99 | cx->blk_loop.itervar = ivar; \ |
| 100 | if (ivar) \ |
| 101 | cx->blk_loop.itersave = *cx->blk_loop.itervar; |
| 102 | |
| 103 | #define POPLOOP(cx) \ |
| 104 | newsp = stack_base + cx->blk_loop.resetsp; \ |
| 105 | if (cx->blk_loop.itervar) \ |
| 106 | *cx->blk_loop.itervar = cx->blk_loop.itersave; |
| 107 | |
| 108 | /* context common to subroutines, evals and loops */ |
| 109 | struct block { |
| 110 | I32 blku_oldsp; /* stack pointer to copy stuff down to */ |
| 111 | COP * blku_oldcop; /* old curcop pointer */ |
| 112 | I32 blku_oldretsp; /* return stack index */ |
| 113 | I32 blku_oldmarksp; /* mark stack index */ |
| 114 | I32 blku_oldscopesp; /* scope stack index */ |
| 115 | PMOP * blku_oldpm; /* values of pattern match vars */ |
| 116 | U8 blku_gimme; /* is this block running in list context? */ |
| 117 | |
| 118 | union { |
| 119 | struct block_sub blku_sub; |
| 120 | struct block_eval blku_eval; |
| 121 | struct block_loop blku_loop; |
| 122 | } blk_u; |
| 123 | }; |
| 124 | #define blk_oldsp cx_u.cx_blk.blku_oldsp |
| 125 | #define blk_oldcop cx_u.cx_blk.blku_oldcop |
| 126 | #define blk_oldretsp cx_u.cx_blk.blku_oldretsp |
| 127 | #define blk_oldmarksp cx_u.cx_blk.blku_oldmarksp |
| 128 | #define blk_oldscopesp cx_u.cx_blk.blku_oldscopesp |
| 129 | #define blk_oldpm cx_u.cx_blk.blku_oldpm |
| 130 | #define blk_gimme cx_u.cx_blk.blku_gimme |
| 131 | #define blk_sub cx_u.cx_blk.blk_u.blku_sub |
| 132 | #define blk_eval cx_u.cx_blk.blk_u.blku_eval |
| 133 | #define blk_loop cx_u.cx_blk.blk_u.blku_loop |
| 134 | |
| 135 | /* Enter a block. */ |
| 136 | #define PUSHBLOCK(cx,t,sp) CXINC, cx = &cxstack[cxstack_ix], \ |
| 137 | cx->cx_type = t, \ |
| 138 | cx->blk_oldsp = sp - stack_base, \ |
| 139 | cx->blk_oldcop = curcop, \ |
| 140 | cx->blk_oldmarksp = markstack_ptr - markstack, \ |
| 141 | cx->blk_oldscopesp = scopestack_ix, \ |
| 142 | cx->blk_oldretsp = retstack_ix, \ |
| 143 | cx->blk_oldpm = curpm, \ |
| 144 | cx->blk_gimme = gimme; \ |
| 145 | DEBUG_l( fprintf(stderr,"Entering block %ld, type %s\n", \ |
| 146 | (long)cxstack_ix, block_type[t]); ) |
| 147 | |
| 148 | /* Exit a block (RETURN and LAST). */ |
| 149 | #define POPBLOCK(cx,pm) cx = &cxstack[cxstack_ix--], \ |
| 150 | newsp = stack_base + cx->blk_oldsp, \ |
| 151 | curcop = cx->blk_oldcop, \ |
| 152 | markstack_ptr = markstack + cx->blk_oldmarksp, \ |
| 153 | scopestack_ix = cx->blk_oldscopesp, \ |
| 154 | retstack_ix = cx->blk_oldretsp, \ |
| 155 | pm = cx->blk_oldpm, \ |
| 156 | gimme = cx->blk_gimme; \ |
| 157 | DEBUG_l( fprintf(stderr,"Leaving block %ld, type %s\n", \ |
| 158 | (long)cxstack_ix+1,block_type[cx->cx_type]); ) |
| 159 | |
| 160 | /* Continue a block elsewhere (NEXT and REDO). */ |
| 161 | #define TOPBLOCK(cx) cx = &cxstack[cxstack_ix], \ |
| 162 | stack_sp = stack_base + cx->blk_oldsp, \ |
| 163 | markstack_ptr = markstack + cx->blk_oldmarksp, \ |
| 164 | scopestack_ix = cx->blk_oldscopesp, \ |
| 165 | retstack_ix = cx->blk_oldretsp |
| 166 | |
| 167 | /* substitution context */ |
| 168 | struct subst { |
| 169 | I32 sbu_iters; |
| 170 | I32 sbu_maxiters; |
| 171 | I32 sbu_safebase; |
| 172 | I32 sbu_once; |
| 173 | char * sbu_orig; |
| 174 | SV * sbu_dstr; |
| 175 | SV * sbu_targ; |
| 176 | char * sbu_s; |
| 177 | char * sbu_m; |
| 178 | char * sbu_strend; |
| 179 | char * sbu_subbase; |
| 180 | }; |
| 181 | #define sb_iters cx_u.cx_subst.sbu_iters |
| 182 | #define sb_maxiters cx_u.cx_subst.sbu_maxiters |
| 183 | #define sb_safebase cx_u.cx_subst.sbu_safebase |
| 184 | #define sb_once cx_u.cx_subst.sbu_once |
| 185 | #define sb_orig cx_u.cx_subst.sbu_orig |
| 186 | #define sb_dstr cx_u.cx_subst.sbu_dstr |
| 187 | #define sb_targ cx_u.cx_subst.sbu_targ |
| 188 | #define sb_s cx_u.cx_subst.sbu_s |
| 189 | #define sb_m cx_u.cx_subst.sbu_m |
| 190 | #define sb_strend cx_u.cx_subst.sbu_strend |
| 191 | #define sb_subbase cx_u.cx_subst.sbu_subbase |
| 192 | |
| 193 | #define PUSHSUBST(cx) CXINC, cx = &cxstack[cxstack_ix], \ |
| 194 | cx->sb_iters = iters, \ |
| 195 | cx->sb_maxiters = maxiters, \ |
| 196 | cx->sb_safebase = safebase, \ |
| 197 | cx->sb_once = once, \ |
| 198 | cx->sb_orig = orig, \ |
| 199 | cx->sb_dstr = dstr, \ |
| 200 | cx->sb_targ = targ, \ |
| 201 | cx->sb_s = s, \ |
| 202 | cx->sb_m = m, \ |
| 203 | cx->sb_strend = strend, \ |
| 204 | cx->cx_type = CXt_SUBST |
| 205 | |
| 206 | #define POPSUBST(cx) cxstack_ix-- |
| 207 | |
| 208 | struct context { |
| 209 | I32 cx_type; /* what kind of context this is */ |
| 210 | union { |
| 211 | struct block cx_blk; |
| 212 | struct subst cx_subst; |
| 213 | } cx_u; |
| 214 | }; |
| 215 | #define CXt_NULL 0 |
| 216 | #define CXt_SUB 1 |
| 217 | #define CXt_EVAL 2 |
| 218 | #define CXt_LOOP 3 |
| 219 | #define CXt_SUBST 4 |
| 220 | #define CXt_BLOCK 5 |
| 221 | |
| 222 | #define CXINC (cxstack_ix < cxstack_max ? ++cxstack_ix : (cxstack_ix = cxinc())) |
| 223 | |
| 224 | /* "gimme" values */ |
| 225 | #define G_SCALAR 0 |
| 226 | #define G_ARRAY 1 |
| 227 | |
| 228 | /* extra flags for perl_call_* routines */ |
| 229 | #define G_DISCARD 2 /* Call FREETMPS. */ |
| 230 | #define G_EVAL 4 /* Assume eval {} around subroutine call. */ |
| 231 | #define G_NOARGS 8 /* Don't construct a @_ array. */ |