| 1 | /* cop.h |
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| 2 | * |
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| 3 | * Copyright (c) 1991-2000, Larry Wall |
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| 4 | * |
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| 5 | * You may distribute under the terms of either the GNU General Public |
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| 6 | * License or the Artistic License, as specified in the README file. |
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| 7 | * |
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| 8 | */ |
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| 9 | |
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| 10 | struct cop { |
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| 11 | BASEOP |
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| 12 | char * cop_label; /* label for this construct */ |
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| 13 | #ifdef USE_ITHREADS |
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| 14 | char * cop_stashpv; /* package line was compiled in */ |
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| 15 | char * cop_file; /* file name the following line # is from */ |
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| 16 | #else |
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| 17 | HV * cop_stash; /* package line was compiled in */ |
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| 18 | GV * cop_filegv; /* file the following line # is from */ |
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| 19 | #endif |
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| 20 | U32 cop_seq; /* parse sequence number */ |
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| 21 | I32 cop_arybase; /* array base this line was compiled with */ |
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| 22 | line_t cop_line; /* line # of this command */ |
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| 23 | SV * cop_warnings; /* lexical warnings bitmask */ |
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| 24 | }; |
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| 25 | |
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| 26 | #define Nullcop Null(COP*) |
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| 27 | |
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| 28 | #ifdef USE_ITHREADS |
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| 29 | # define CopFILE(c) ((c)->cop_file) |
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| 30 | # define CopFILEGV(c) (CopFILE(c) \ |
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| 31 | ? gv_fetchfile(CopFILE(c)) : Nullgv) |
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| 32 | # define CopFILE_set(c,pv) ((c)->cop_file = savepv(pv)) /* XXX */ |
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| 33 | # define CopFILESV(c) (CopFILE(c) \ |
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| 34 | ? GvSV(gv_fetchfile(CopFILE(c))) : Nullsv) |
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| 35 | # define CopFILEAV(c) (CopFILE(c) \ |
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| 36 | ? GvAV(gv_fetchfile(CopFILE(c))) : Nullav) |
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| 37 | # define CopSTASHPV(c) ((c)->cop_stashpv) |
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| 38 | # define CopSTASHPV_set(c,pv) ((c)->cop_stashpv = savepv(pv)) /* XXX */ |
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| 39 | # define CopSTASH(c) (CopSTASHPV(c) \ |
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| 40 | ? gv_stashpv(CopSTASHPV(c),GV_ADD) : Nullhv) |
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| 41 | # define CopSTASH_set(c,hv) CopSTASHPV_set(c, HvNAME(hv)) |
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| 42 | # define CopSTASH_eq(c,hv) (hv \ |
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| 43 | && (CopSTASHPV(c) == HvNAME(hv) \ |
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| 44 | || (CopSTASHPV(c) && HvNAME(hv) \ |
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| 45 | && strEQ(CopSTASHPV(c), HvNAME(hv))))) |
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| 46 | #else |
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| 47 | # define CopFILEGV(c) ((c)->cop_filegv) |
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| 48 | # define CopFILEGV_set(c,gv) ((c)->cop_filegv = gv) |
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| 49 | # define CopFILE_set(c,pv) ((c)->cop_filegv = gv_fetchfile(pv)) |
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| 50 | # define CopFILESV(c) (CopFILEGV(c) ? GvSV(CopFILEGV(c)) : Nullsv) |
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| 51 | # define CopFILEAV(c) (CopFILEGV(c) ? GvAV(CopFILEGV(c)) : Nullav) |
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| 52 | # define CopFILE(c) (CopFILESV(c) ? SvPVX(CopFILESV(c)) : Nullch) |
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| 53 | # define CopSTASH(c) ((c)->cop_stash) |
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| 54 | # define CopSTASH_set(c,hv) ((c)->cop_stash = hv) |
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| 55 | # define CopSTASHPV(c) (CopSTASH(c) ? HvNAME(CopSTASH(c)) : Nullch) |
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| 56 | # define CopSTASHPV_set(c,pv) CopSTASH_set(c, gv_stashpv(pv,GV_ADD)) |
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| 57 | # define CopSTASH_eq(c,hv) (CopSTASH(c) == hv) |
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| 58 | #endif /* USE_ITHREADS */ |
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| 59 | |
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| 60 | #define CopSTASH_ne(c,hv) (!CopSTASH_eq(c,hv)) |
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| 61 | #define CopLINE(c) ((c)->cop_line) |
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| 62 | #define CopLINE_inc(c) (++CopLINE(c)) |
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| 63 | #define CopLINE_dec(c) (--CopLINE(c)) |
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| 64 | #define CopLINE_set(c,l) (CopLINE(c) = (l)) |
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| 65 | |
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| 66 | /* |
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| 67 | * Here we have some enormously heavy (or at least ponderous) wizardry. |
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| 68 | */ |
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| 69 | |
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| 70 | /* subroutine context */ |
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| 71 | struct block_sub { |
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| 72 | CV * cv; |
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| 73 | GV * gv; |
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| 74 | GV * dfoutgv; |
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| 75 | #ifndef USE_THREADS |
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| 76 | AV * savearray; |
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| 77 | #endif /* USE_THREADS */ |
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| 78 | AV * argarray; |
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| 79 | U16 olddepth; |
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| 80 | U8 hasargs; |
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| 81 | U8 lval; /* XXX merge lval and hasargs? */ |
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| 82 | }; |
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| 83 | |
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| 84 | #define PUSHSUB(cx) \ |
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| 85 | cx->blk_sub.cv = cv; \ |
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| 86 | cx->blk_sub.olddepth = CvDEPTH(cv); \ |
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| 87 | cx->blk_sub.hasargs = hasargs; \ |
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| 88 | cx->blk_sub.lval = PL_op->op_private & \ |
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| 89 | (OPpLVAL_INTRO|OPpENTERSUB_INARGS); |
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| 90 | |
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| 91 | #define PUSHFORMAT(cx) \ |
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| 92 | cx->blk_sub.cv = cv; \ |
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| 93 | cx->blk_sub.gv = gv; \ |
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| 94 | cx->blk_sub.hasargs = 0; \ |
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| 95 | cx->blk_sub.dfoutgv = PL_defoutgv; \ |
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| 96 | (void)SvREFCNT_inc(cx->blk_sub.dfoutgv) |
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| 97 | |
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| 98 | #ifdef USE_THREADS |
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| 99 | # define POP_SAVEARRAY() NOOP |
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| 100 | #else |
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| 101 | # define POP_SAVEARRAY() \ |
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| 102 | STMT_START { \ |
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| 103 | SvREFCNT_dec(GvAV(PL_defgv)); \ |
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| 104 | GvAV(PL_defgv) = cx->blk_sub.savearray; \ |
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| 105 | } STMT_END |
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| 106 | #endif /* USE_THREADS */ |
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| 107 | |
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| 108 | #ifdef USE_ITHREADS |
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| 109 | /* junk in @_ spells trouble when cloning CVs, so don't leave any */ |
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| 110 | # define CLEAR_ARGARRAY() av_clear(cx->blk_sub.argarray) |
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| 111 | #else |
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| 112 | # define CLEAR_ARGARRAY() NOOP |
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| 113 | #endif /* USE_ITHREADS */ |
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| 114 | |
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| 115 | |
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| 116 | #define POPSUB(cx,sv) \ |
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| 117 | STMT_START { \ |
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| 118 | if (cx->blk_sub.hasargs) { \ |
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| 119 | POP_SAVEARRAY(); \ |
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| 120 | /* abandon @_ if it got reified */ \ |
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| 121 | if (AvREAL(cx->blk_sub.argarray)) { \ |
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| 122 | SSize_t fill = AvFILLp(cx->blk_sub.argarray); \ |
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| 123 | SvREFCNT_dec(cx->blk_sub.argarray); \ |
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| 124 | cx->blk_sub.argarray = newAV(); \ |
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| 125 | av_extend(cx->blk_sub.argarray, fill); \ |
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| 126 | AvFLAGS(cx->blk_sub.argarray) = AVf_REIFY; \ |
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| 127 | PL_curpad[0] = (SV*)cx->blk_sub.argarray; \ |
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| 128 | } \ |
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| 129 | else { \ |
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| 130 | CLEAR_ARGARRAY(); \ |
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| 131 | } \ |
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| 132 | } \ |
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| 133 | sv = (SV*)cx->blk_sub.cv; \ |
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| 134 | if (sv && (CvDEPTH((CV*)sv) = cx->blk_sub.olddepth)) \ |
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| 135 | sv = Nullsv; \ |
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| 136 | } STMT_END |
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| 137 | |
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| 138 | #define LEAVESUB(sv) \ |
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| 139 | STMT_START { \ |
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| 140 | if (sv) \ |
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| 141 | SvREFCNT_dec(sv); \ |
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| 142 | } STMT_END |
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| 143 | |
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| 144 | #define POPFORMAT(cx) \ |
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| 145 | setdefout(cx->blk_sub.dfoutgv); \ |
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| 146 | SvREFCNT_dec(cx->blk_sub.dfoutgv); |
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| 147 | |
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| 148 | /* eval context */ |
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| 149 | struct block_eval { |
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| 150 | I32 old_in_eval; |
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| 151 | I32 old_op_type; |
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| 152 | SV * old_namesv; |
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| 153 | OP * old_eval_root; |
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| 154 | SV * cur_text; |
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| 155 | }; |
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| 156 | |
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| 157 | #define PUSHEVAL(cx,n,fgv) \ |
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| 158 | STMT_START { \ |
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| 159 | cx->blk_eval.old_in_eval = PL_in_eval; \ |
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| 160 | cx->blk_eval.old_op_type = PL_op->op_type; \ |
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| 161 | cx->blk_eval.old_namesv = (n ? newSVpv(n,0) : Nullsv); \ |
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| 162 | cx->blk_eval.old_eval_root = PL_eval_root; \ |
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| 163 | cx->blk_eval.cur_text = PL_linestr; \ |
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| 164 | } STMT_END |
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| 165 | |
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| 166 | #define POPEVAL(cx) \ |
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| 167 | STMT_START { \ |
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| 168 | PL_in_eval = cx->blk_eval.old_in_eval; \ |
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| 169 | optype = cx->blk_eval.old_op_type; \ |
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| 170 | PL_eval_root = cx->blk_eval.old_eval_root; \ |
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| 171 | if (cx->blk_eval.old_namesv) \ |
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| 172 | sv_2mortal(cx->blk_eval.old_namesv); \ |
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| 173 | } STMT_END |
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| 174 | |
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| 175 | /* loop context */ |
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| 176 | struct block_loop { |
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| 177 | char * label; |
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| 178 | I32 resetsp; |
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| 179 | OP * redo_op; |
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| 180 | OP * next_op; |
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| 181 | OP * last_op; |
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| 182 | #ifdef USE_ITHREADS |
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| 183 | void * iterdata; |
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| 184 | SV ** oldcurpad; |
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| 185 | #else |
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| 186 | SV ** itervar; |
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| 187 | #endif |
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| 188 | SV * itersave; |
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| 189 | SV * iterlval; |
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| 190 | AV * iterary; |
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| 191 | IV iterix; |
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| 192 | IV itermax; |
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| 193 | }; |
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| 194 | |
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| 195 | #ifdef USE_ITHREADS |
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| 196 | # define CxITERVAR(c) \ |
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| 197 | ((c)->blk_loop.iterdata \ |
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| 198 | ? (CxPADLOOP(cx) \ |
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| 199 | ? &((c)->blk_loop.oldcurpad)[(PADOFFSET)(c)->blk_loop.iterdata] \ |
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| 200 | : &GvSV((GV*)(c)->blk_loop.iterdata)) \ |
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| 201 | : (SV**)NULL) |
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| 202 | # define CX_ITERDATA_SET(cx,idata) \ |
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| 203 | cx->blk_loop.oldcurpad = PL_curpad; \ |
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| 204 | if ((cx->blk_loop.iterdata = (idata))) \ |
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| 205 | cx->blk_loop.itersave = SvREFCNT_inc(*CxITERVAR(cx)); |
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| 206 | #else |
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| 207 | # define CxITERVAR(c) ((c)->blk_loop.itervar) |
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| 208 | # define CX_ITERDATA_SET(cx,ivar) \ |
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| 209 | if ((cx->blk_loop.itervar = (SV**)(ivar))) \ |
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| 210 | cx->blk_loop.itersave = SvREFCNT_inc(*CxITERVAR(cx)); |
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| 211 | #endif |
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| 212 | |
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| 213 | #define PUSHLOOP(cx, dat, s) \ |
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| 214 | cx->blk_loop.label = PL_curcop->cop_label; \ |
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| 215 | cx->blk_loop.resetsp = s - PL_stack_base; \ |
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| 216 | cx->blk_loop.redo_op = cLOOP->op_redoop; \ |
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| 217 | cx->blk_loop.next_op = cLOOP->op_nextop; \ |
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| 218 | cx->blk_loop.last_op = cLOOP->op_lastop; \ |
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| 219 | cx->blk_loop.iterlval = Nullsv; \ |
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| 220 | cx->blk_loop.iterary = Nullav; \ |
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| 221 | cx->blk_loop.iterix = -1; \ |
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| 222 | CX_ITERDATA_SET(cx,dat); |
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| 223 | |
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| 224 | #define POPLOOP(cx) \ |
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| 225 | SvREFCNT_dec(cx->blk_loop.iterlval); \ |
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| 226 | if (CxITERVAR(cx)) { \ |
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| 227 | SV **s_v_p = CxITERVAR(cx); \ |
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| 228 | sv_2mortal(*s_v_p); \ |
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| 229 | *s_v_p = cx->blk_loop.itersave; \ |
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| 230 | } \ |
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| 231 | if (cx->blk_loop.iterary && cx->blk_loop.iterary != PL_curstack)\ |
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| 232 | SvREFCNT_dec(cx->blk_loop.iterary); |
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| 233 | |
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| 234 | /* context common to subroutines, evals and loops */ |
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| 235 | struct block { |
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| 236 | I32 blku_oldsp; /* stack pointer to copy stuff down to */ |
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| 237 | COP * blku_oldcop; /* old curcop pointer */ |
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| 238 | I32 blku_oldretsp; /* return stack index */ |
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| 239 | I32 blku_oldmarksp; /* mark stack index */ |
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| 240 | I32 blku_oldscopesp; /* scope stack index */ |
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| 241 | PMOP * blku_oldpm; /* values of pattern match vars */ |
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| 242 | U8 blku_gimme; /* is this block running in list context? */ |
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| 243 | |
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| 244 | union { |
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| 245 | struct block_sub blku_sub; |
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| 246 | struct block_eval blku_eval; |
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| 247 | struct block_loop blku_loop; |
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| 248 | } blk_u; |
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| 249 | }; |
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| 250 | #define blk_oldsp cx_u.cx_blk.blku_oldsp |
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| 251 | #define blk_oldcop cx_u.cx_blk.blku_oldcop |
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| 252 | #define blk_oldretsp cx_u.cx_blk.blku_oldretsp |
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| 253 | #define blk_oldmarksp cx_u.cx_blk.blku_oldmarksp |
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| 254 | #define blk_oldscopesp cx_u.cx_blk.blku_oldscopesp |
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| 255 | #define blk_oldpm cx_u.cx_blk.blku_oldpm |
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| 256 | #define blk_gimme cx_u.cx_blk.blku_gimme |
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| 257 | #define blk_sub cx_u.cx_blk.blk_u.blku_sub |
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| 258 | #define blk_eval cx_u.cx_blk.blk_u.blku_eval |
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| 259 | #define blk_loop cx_u.cx_blk.blk_u.blku_loop |
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| 260 | |
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| 261 | /* Enter a block. */ |
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| 262 | #define PUSHBLOCK(cx,t,sp) CXINC, cx = &cxstack[cxstack_ix], \ |
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| 263 | cx->cx_type = t, \ |
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| 264 | cx->blk_oldsp = sp - PL_stack_base, \ |
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| 265 | cx->blk_oldcop = PL_curcop, \ |
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| 266 | cx->blk_oldmarksp = PL_markstack_ptr - PL_markstack, \ |
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| 267 | cx->blk_oldscopesp = PL_scopestack_ix, \ |
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| 268 | cx->blk_oldretsp = PL_retstack_ix, \ |
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| 269 | cx->blk_oldpm = PL_curpm, \ |
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| 270 | cx->blk_gimme = gimme; \ |
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| 271 | DEBUG_l( PerlIO_printf(Perl_debug_log, "Entering block %ld, type %s\n", \ |
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| 272 | (long)cxstack_ix, PL_block_type[CxTYPE(cx)]); ) |
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| 273 | |
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| 274 | /* Exit a block (RETURN and LAST). */ |
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| 275 | #define POPBLOCK(cx,pm) cx = &cxstack[cxstack_ix--], \ |
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| 276 | newsp = PL_stack_base + cx->blk_oldsp, \ |
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| 277 | PL_curcop = cx->blk_oldcop, \ |
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| 278 | PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp, \ |
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| 279 | PL_scopestack_ix = cx->blk_oldscopesp, \ |
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| 280 | PL_retstack_ix = cx->blk_oldretsp, \ |
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| 281 | pm = cx->blk_oldpm, \ |
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| 282 | gimme = cx->blk_gimme; \ |
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| 283 | DEBUG_l( PerlIO_printf(Perl_debug_log, "Leaving block %ld, type %s\n", \ |
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| 284 | (long)cxstack_ix+1,PL_block_type[CxTYPE(cx)]); ) |
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| 285 | |
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| 286 | /* Continue a block elsewhere (NEXT and REDO). */ |
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| 287 | #define TOPBLOCK(cx) cx = &cxstack[cxstack_ix], \ |
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| 288 | PL_stack_sp = PL_stack_base + cx->blk_oldsp, \ |
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| 289 | PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp, \ |
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| 290 | PL_scopestack_ix = cx->blk_oldscopesp, \ |
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| 291 | PL_retstack_ix = cx->blk_oldretsp, \ |
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| 292 | PL_curpm = cx->blk_oldpm |
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| 293 | |
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| 294 | /* substitution context */ |
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| 295 | struct subst { |
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| 296 | I32 sbu_iters; |
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| 297 | I32 sbu_maxiters; |
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| 298 | I32 sbu_rflags; |
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| 299 | I32 sbu_oldsave; |
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| 300 | bool sbu_once; |
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| 301 | bool sbu_rxtainted; |
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| 302 | char * sbu_orig; |
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| 303 | SV * sbu_dstr; |
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| 304 | SV * sbu_targ; |
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| 305 | char * sbu_s; |
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| 306 | char * sbu_m; |
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| 307 | char * sbu_strend; |
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| 308 | void * sbu_rxres; |
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| 309 | REGEXP * sbu_rx; |
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| 310 | }; |
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| 311 | #define sb_iters cx_u.cx_subst.sbu_iters |
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| 312 | #define sb_maxiters cx_u.cx_subst.sbu_maxiters |
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| 313 | #define sb_rflags cx_u.cx_subst.sbu_rflags |
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| 314 | #define sb_oldsave cx_u.cx_subst.sbu_oldsave |
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| 315 | #define sb_once cx_u.cx_subst.sbu_once |
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| 316 | #define sb_rxtainted cx_u.cx_subst.sbu_rxtainted |
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| 317 | #define sb_orig cx_u.cx_subst.sbu_orig |
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| 318 | #define sb_dstr cx_u.cx_subst.sbu_dstr |
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| 319 | #define sb_targ cx_u.cx_subst.sbu_targ |
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| 320 | #define sb_s cx_u.cx_subst.sbu_s |
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| 321 | #define sb_m cx_u.cx_subst.sbu_m |
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| 322 | #define sb_strend cx_u.cx_subst.sbu_strend |
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| 323 | #define sb_rxres cx_u.cx_subst.sbu_rxres |
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| 324 | #define sb_rx cx_u.cx_subst.sbu_rx |
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| 325 | |
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| 326 | #define PUSHSUBST(cx) CXINC, cx = &cxstack[cxstack_ix], \ |
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| 327 | cx->sb_iters = iters, \ |
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| 328 | cx->sb_maxiters = maxiters, \ |
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| 329 | cx->sb_rflags = r_flags, \ |
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| 330 | cx->sb_oldsave = oldsave, \ |
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| 331 | cx->sb_once = once, \ |
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| 332 | cx->sb_rxtainted = rxtainted, \ |
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| 333 | cx->sb_orig = orig, \ |
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| 334 | cx->sb_dstr = dstr, \ |
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| 335 | cx->sb_targ = targ, \ |
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| 336 | cx->sb_s = s, \ |
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| 337 | cx->sb_m = m, \ |
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| 338 | cx->sb_strend = strend, \ |
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| 339 | cx->sb_rxres = Null(void*), \ |
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| 340 | cx->sb_rx = rx, \ |
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| 341 | cx->cx_type = CXt_SUBST; \ |
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| 342 | rxres_save(&cx->sb_rxres, rx) |
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| 343 | |
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| 344 | #define POPSUBST(cx) cx = &cxstack[cxstack_ix--]; \ |
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| 345 | rxres_free(&cx->sb_rxres) |
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| 346 | |
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| 347 | struct context { |
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| 348 | U32 cx_type; /* what kind of context this is */ |
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| 349 | union { |
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| 350 | struct block cx_blk; |
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| 351 | struct subst cx_subst; |
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| 352 | } cx_u; |
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| 353 | }; |
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| 354 | |
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| 355 | #define CXTYPEMASK 0xff |
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| 356 | #define CXt_NULL 0 |
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| 357 | #define CXt_SUB 1 |
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| 358 | #define CXt_EVAL 2 |
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| 359 | #define CXt_LOOP 3 |
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| 360 | #define CXt_SUBST 4 |
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| 361 | #define CXt_BLOCK 5 |
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| 362 | #define CXt_FORMAT 6 |
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| 363 | |
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| 364 | /* private flags for CXt_EVAL */ |
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| 365 | #define CXp_REAL 0x00000100 /* truly eval'', not a lookalike */ |
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| 366 | #define CXp_TRYBLOCK 0x00000200 /* eval{}, not eval'' or similar */ |
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| 367 | |
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| 368 | #ifdef USE_ITHREADS |
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| 369 | /* private flags for CXt_LOOP */ |
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| 370 | # define CXp_PADVAR 0x00000100 /* itervar lives on pad, iterdata |
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| 371 | has pad offset; if not set, |
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| 372 | iterdata holds GV* */ |
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| 373 | # define CxPADLOOP(c) (((c)->cx_type & (CXt_LOOP|CXp_PADVAR)) \ |
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| 374 | == (CXt_LOOP|CXp_PADVAR)) |
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| 375 | #endif |
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| 376 | |
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| 377 | #define CxTYPE(c) ((c)->cx_type & CXTYPEMASK) |
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| 378 | #define CxREALEVAL(c) (((c)->cx_type & (CXt_EVAL|CXp_REAL)) \ |
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| 379 | == (CXt_EVAL|CXp_REAL)) |
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| 380 | #define CxTRYBLOCK(c) (((c)->cx_type & (CXt_EVAL|CXp_TRYBLOCK)) \ |
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| 381 | == (CXt_EVAL|CXp_TRYBLOCK)) |
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| 382 | |
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| 383 | #define CXINC (cxstack_ix < cxstack_max ? ++cxstack_ix : (cxstack_ix = cxinc())) |
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| 384 | |
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| 385 | /* "gimme" values */ |
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| 386 | |
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| 387 | /* |
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| 388 | =for apidoc AmU||G_SCALAR |
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| 389 | Used to indicate scalar context. See C<GIMME_V>, C<GIMME>, and |
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| 390 | L<perlcall>. |
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| 391 | |
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| 392 | =for apidoc AmU||G_ARRAY |
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| 393 | Used to indicate array context. See C<GIMME_V>, C<GIMME> and |
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| 394 | L<perlcall>. |
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| 395 | |
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| 396 | =for apidoc AmU||G_VOID |
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| 397 | Used to indicate void context. See C<GIMME_V> and L<perlcall>. |
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| 398 | |
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| 399 | =for apidoc AmU||G_DISCARD |
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| 400 | Indicates that arguments returned from a callback should be discarded. See |
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| 401 | L<perlcall>. |
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| 402 | |
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| 403 | =for apidoc AmU||G_EVAL |
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| 404 | |
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| 405 | Used to force a Perl C<eval> wrapper around a callback. See |
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| 406 | L<perlcall>. |
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| 407 | |
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| 408 | =for apidoc AmU||G_NOARGS |
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| 409 | |
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| 410 | Indicates that no arguments are being sent to a callback. See |
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| 411 | L<perlcall>. |
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| 412 | |
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| 413 | =cut |
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| 414 | */ |
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| 415 | |
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| 416 | #define G_SCALAR 0 |
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| 417 | #define G_ARRAY 1 |
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| 418 | #define G_VOID 128 /* skip this bit when adding flags below */ |
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| 419 | |
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| 420 | /* extra flags for Perl_call_* routines */ |
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| 421 | #define G_DISCARD 2 /* Call FREETMPS. */ |
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| 422 | #define G_EVAL 4 /* Assume eval {} around subroutine call. */ |
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| 423 | #define G_NOARGS 8 /* Don't construct a @_ array. */ |
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| 424 | #define G_KEEPERR 16 /* Append errors to $@, don't overwrite it */ |
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| 425 | #define G_NODEBUG 32 /* Disable debugging at toplevel. */ |
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| 426 | |
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| 427 | /* flag bits for PL_in_eval */ |
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| 428 | #define EVAL_NULL 0 /* not in an eval */ |
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| 429 | #define EVAL_INEVAL 1 /* some enclosing scope is an eval */ |
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| 430 | #define EVAL_WARNONLY 2 /* used by yywarn() when calling yyerror() */ |
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| 431 | #define EVAL_KEEPERR 4 /* set by Perl_call_sv if G_KEEPERR */ |
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| 432 | |
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| 433 | /* Support for switching (stack and block) contexts. |
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| 434 | * This ensures magic doesn't invalidate local stack and cx pointers. |
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| 435 | */ |
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| 436 | |
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| 437 | #define PERLSI_UNKNOWN -1 |
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| 438 | #define PERLSI_UNDEF 0 |
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| 439 | #define PERLSI_MAIN 1 |
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| 440 | #define PERLSI_MAGIC 2 |
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| 441 | #define PERLSI_SORT 3 |
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| 442 | #define PERLSI_SIGNAL 4 |
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| 443 | #define PERLSI_OVERLOAD 5 |
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| 444 | #define PERLSI_DESTROY 6 |
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| 445 | #define PERLSI_WARNHOOK 7 |
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| 446 | #define PERLSI_DIEHOOK 8 |
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| 447 | #define PERLSI_REQUIRE 9 |
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| 448 | |
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| 449 | struct stackinfo { |
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| 450 | AV * si_stack; /* stack for current runlevel */ |
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| 451 | PERL_CONTEXT * si_cxstack; /* context stack for runlevel */ |
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| 452 | I32 si_cxix; /* current context index */ |
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| 453 | I32 si_cxmax; /* maximum allocated index */ |
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| 454 | I32 si_type; /* type of runlevel */ |
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| 455 | struct stackinfo * si_prev; |
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| 456 | struct stackinfo * si_next; |
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| 457 | I32 si_markoff; /* offset where markstack begins for us. |
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| 458 | * currently used only with DEBUGGING, |
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| 459 | * but not #ifdef-ed for bincompat */ |
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| 460 | }; |
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| 461 | |
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| 462 | typedef struct stackinfo PERL_SI; |
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| 463 | |
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| 464 | #define cxstack (PL_curstackinfo->si_cxstack) |
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| 465 | #define cxstack_ix (PL_curstackinfo->si_cxix) |
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| 466 | #define cxstack_max (PL_curstackinfo->si_cxmax) |
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| 467 | |
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| 468 | #ifdef DEBUGGING |
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| 469 | # define SET_MARK_OFFSET \ |
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| 470 | PL_curstackinfo->si_markoff = PL_markstack_ptr - PL_markstack |
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| 471 | #else |
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| 472 | # define SET_MARK_OFFSET NOOP |
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| 473 | #endif |
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| 474 | |
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| 475 | #define PUSHSTACKi(type) \ |
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| 476 | STMT_START { \ |
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| 477 | PERL_SI *next = PL_curstackinfo->si_next; \ |
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| 478 | if (!next) { \ |
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| 479 | next = new_stackinfo(32, 2048/sizeof(PERL_CONTEXT) - 1); \ |
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| 480 | next->si_prev = PL_curstackinfo; \ |
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| 481 | PL_curstackinfo->si_next = next; \ |
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| 482 | } \ |
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| 483 | next->si_type = type; \ |
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| 484 | next->si_cxix = -1; \ |
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| 485 | AvFILLp(next->si_stack) = 0; \ |
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| 486 | SWITCHSTACK(PL_curstack,next->si_stack); \ |
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| 487 | PL_curstackinfo = next; \ |
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| 488 | SET_MARK_OFFSET; \ |
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| 489 | } STMT_END |
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| 490 | |
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| 491 | #define PUSHSTACK PUSHSTACKi(PERLSI_UNKNOWN) |
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| 492 | |
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| 493 | /* POPSTACK works with PL_stack_sp, so it may need to be bracketed by |
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| 494 | * PUTBACK/SPAGAIN to flush/refresh any local SP that may be active */ |
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| 495 | #define POPSTACK \ |
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| 496 | STMT_START { \ |
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| 497 | djSP; \ |
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| 498 | PERL_SI *prev = PL_curstackinfo->si_prev; \ |
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| 499 | if (!prev) { \ |
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| 500 | PerlIO_printf(Perl_error_log, "panic: POPSTACK\n"); \ |
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| 501 | my_exit(1); \ |
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| 502 | } \ |
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| 503 | SWITCHSTACK(PL_curstack,prev->si_stack); \ |
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| 504 | /* don't free prev here, free them all at the END{} */ \ |
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| 505 | PL_curstackinfo = prev; \ |
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| 506 | } STMT_END |
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| 507 | |
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| 508 | #define POPSTACK_TO(s) \ |
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| 509 | STMT_START { \ |
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| 510 | while (PL_curstack != s) { \ |
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| 511 | dounwind(-1); \ |
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| 512 | POPSTACK; \ |
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| 513 | } \ |
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| 514 | } STMT_END |
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