cop.h

   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.hasargs = 0;                                        \
  46         cx->blk_sub.dfoutgv = defoutgv;                                 \
  47         (void)SvREFCNT_inc(cx->blk_sub.dfoutgv)
  48
  49 /* We muck with cxstack_ix since _dec may call a DESTROY, overwriting cx. */
  50
  51 #define POPSUB(cx)                                                      \
  52         if (cx->blk_sub.hasargs) {   /* put back old @_ */              \
  53             SvREFCNT_dec(GvAV(defgv));                                  \
  54             GvAV(defgv) = cx->blk_sub.savearray;                        \
  55         }                                                               \
  56         if (cx->blk_sub.cv) {                                           \
  57             if (!(CvDEPTH(cx->blk_sub.cv) = cx->blk_sub.olddepth)) {    \
  58                 cxstack_ix++;                                           \
  59                 SvREFCNT_dec((SV*)cx->blk_sub.cv);                      \
  60                 cxstack_ix--;                                           \
  61             }                                                           \
  62         }
  63
  64 #define POPFORMAT(cx)                                                   \
  65         setdefout(cx->blk_sub.dfoutgv);                                 \
  66         SvREFCNT_dec(cx->blk_sub.dfoutgv);
  67
  68 /* eval context */
  69 struct block_eval {
  70     I32         old_in_eval;
  71     I32         old_op_type;
  72     char *      old_name;
  73     OP *        old_eval_root;
  74     SV *        cur_text;
  75 };
  76
  77 #define PUSHEVAL(cx,n,fgv)                                              \
  78         cx->blk_eval.old_in_eval = in_eval;                             \
  79         cx->blk_eval.old_op_type = op->op_type;                         \
  80         cx->blk_eval.old_name = n;                                      \
  81         cx->blk_eval.old_eval_root = eval_root;                         \
  82         cx->blk_eval.cur_text = linestr;
  83
  84 #define POPEVAL(cx)                                                     \
  85         in_eval = cx->blk_eval.old_in_eval;                             \
  86         optype = cx->blk_eval.old_op_type;                              \
  87         eval_root = cx->blk_eval.old_eval_root;
  88
  89 /* loop context */
  90 struct block_loop {
  91     char *      label;
  92     I32         resetsp;
  93     OP *        redo_op;
  94     OP *        next_op;
  95     OP *        last_op;
  96     SV **       itervar;
  97     SV *        itersave;
  98     SV *        iterlval;
  99     AV *        iterary;
 100     I32         iterix;
 101 };
 102
 103 #define PUSHLOOP(cx, ivar, s)                                           \
 104         cx->blk_loop.label = curcop->cop_label;                         \
 105         cx->blk_loop.resetsp = s - stack_base;                          \
 106         cx->blk_loop.redo_op = cLOOP->op_redoop;                        \
 107         cx->blk_loop.next_op = cLOOP->op_nextop;                        \
 108         cx->blk_loop.last_op = cLOOP->op_lastop;                        \
 109         if (cx->blk_loop.itervar = (ivar))                              \
 110             cx->blk_loop.itersave = SvREFCNT_inc(*cx->blk_loop.itervar);\
 111         cx->blk_loop.iterlval = Nullsv;                                 \
 112         cx->blk_loop.iterary = Nullav;                                  \
 113         cx->blk_loop.iterix = -1;
 114
 115 #define POPLOOP(cx)                                                     \
 116         newsp           = stack_base + cx->blk_loop.resetsp;            \
 117         SvREFCNT_dec(cx->blk_loop.iterlval);                            \
 118         if (cx->blk_loop.itervar) {                                     \
 119             SvREFCNT_dec(*cx->blk_loop.itervar);                        \
 120             *cx->blk_loop.itervar = cx->blk_loop.itersave;              \
 121         }                                                               \
 122         if (cx->blk_loop.iterary && cx->blk_loop.iterary != curstack)   \
 123             SvREFCNT_dec(cx->blk_loop.iterary);
 124
 125 /* context common to subroutines, evals and loops */
 126 struct block {
 127     I32         blku_oldsp;     /* stack pointer to copy stuff down to */
 128     COP *       blku_oldcop;    /* old curcop pointer */
 129     I32         blku_oldretsp;  /* return stack index */
 130     I32         blku_oldmarksp; /* mark stack index */
 131     I32         blku_oldscopesp;        /* scope stack index */
 132     PMOP *      blku_oldpm;     /* values of pattern match vars */
 133     U8          blku_gimme;     /* is this block running in list context? */
 134
 135     union {
 136         struct block_sub        blku_sub;
 137         struct block_eval       blku_eval;
 138         struct block_loop       blku_loop;
 139     } blk_u;
 140 };
 141 #define blk_oldsp       cx_u.cx_blk.blku_oldsp
 142 #define blk_oldcop      cx_u.cx_blk.blku_oldcop
 143 #define blk_oldretsp    cx_u.cx_blk.blku_oldretsp
 144 #define blk_oldmarksp   cx_u.cx_blk.blku_oldmarksp
 145 #define blk_oldscopesp  cx_u.cx_blk.blku_oldscopesp
 146 #define blk_oldpm       cx_u.cx_blk.blku_oldpm
 147 #define blk_gimme       cx_u.cx_blk.blku_gimme
 148 #define blk_sub         cx_u.cx_blk.blk_u.blku_sub
 149 #define blk_eval        cx_u.cx_blk.blk_u.blku_eval
 150 #define blk_loop        cx_u.cx_blk.blk_u.blku_loop
 151
 152 /* Enter a block. */
 153 #define PUSHBLOCK(cx,t,sp) CXINC, cx = &cxstack[cxstack_ix],            \
 154         cx->cx_type             = t,                                    \
 155         cx->blk_oldsp           = sp - stack_base,                      \
 156         cx->blk_oldcop          = curcop,                               \
 157         cx->blk_oldmarksp       = markstack_ptr - markstack,            \
 158         cx->blk_oldscopesp      = scopestack_ix,                        \
 159         cx->blk_oldretsp        = retstack_ix,                          \
 160         cx->blk_oldpm           = curpm,                                \
 161         cx->blk_gimme           = gimme;                                \
 162         DEBUG_l( PerlIO_printf(PerlIO_stderr(), "Entering block %ld, type %s\n",        \
 163                     (long)cxstack_ix, block_type[t]); )
 164
 165 /* Exit a block (RETURN and LAST). */
 166 #define POPBLOCK(cx,pm) cx = &cxstack[cxstack_ix--],                    \
 167         newsp           = stack_base + cx->blk_oldsp,                   \
 168         curcop          = cx->blk_oldcop,                               \
 169         markstack_ptr   = markstack + cx->blk_oldmarksp,                \
 170         scopestack_ix   = cx->blk_oldscopesp,                           \
 171         retstack_ix     = cx->blk_oldretsp,                             \
 172         pm              = cx->blk_oldpm,                                \
 173         gimme           = cx->blk_gimme;                                \
 174         DEBUG_l( PerlIO_printf(PerlIO_stderr(), "Leaving block %ld, type %s\n",         \
 175                     (long)cxstack_ix+1,block_type[cx->cx_type]); )
 176
 177 /* Continue a block elsewhere (NEXT and REDO). */
 178 #define TOPBLOCK(cx) cx = &cxstack[cxstack_ix],                         \
 179         stack_sp        = stack_base + cx->blk_oldsp,                   \
 180         markstack_ptr   = markstack + cx->blk_oldmarksp,                \
 181         scopestack_ix   = cx->blk_oldscopesp,                           \
 182         retstack_ix     = cx->blk_oldretsp
 183
 184 /* substitution context */
 185 struct subst {
 186     I32         sbu_iters;
 187     I32         sbu_maxiters;
 188     I32         sbu_safebase;
 189     I32         sbu_oldsave;
 190     bool        sbu_once;
 191     bool        sbu_rxtainted;
 192     char *      sbu_orig;
 193     SV *        sbu_dstr;
 194     SV *        sbu_targ;
 195     char *      sbu_s;
 196     char *      sbu_m;
 197     char *      sbu_strend;
 198     char *      sbu_subbase;
 199     REGEXP *    sbu_rx;
 200 };
 201 #define sb_iters        cx_u.cx_subst.sbu_iters
 202 #define sb_maxiters     cx_u.cx_subst.sbu_maxiters
 203 #define sb_safebase     cx_u.cx_subst.sbu_safebase
 204 #define sb_oldsave      cx_u.cx_subst.sbu_oldsave
 205 #define sb_once         cx_u.cx_subst.sbu_once
 206 #define sb_rxtainted    cx_u.cx_subst.sbu_rxtainted
 207 #define sb_orig         cx_u.cx_subst.sbu_orig
 208 #define sb_dstr         cx_u.cx_subst.sbu_dstr
 209 #define sb_targ         cx_u.cx_subst.sbu_targ
 210 #define sb_s            cx_u.cx_subst.sbu_s
 211 #define sb_m            cx_u.cx_subst.sbu_m
 212 #define sb_strend       cx_u.cx_subst.sbu_strend
 213 #define sb_subbase      cx_u.cx_subst.sbu_subbase
 214 #define sb_rx           cx_u.cx_subst.sbu_rx
 215
 216 #define PUSHSUBST(cx) CXINC, cx = &cxstack[cxstack_ix],                 \
 217         cx->sb_iters            = iters,                                \
 218         cx->sb_maxiters         = maxiters,                             \
 219         cx->sb_safebase         = safebase,                             \
 220         cx->sb_oldsave          = oldsave,                              \
 221         cx->sb_once             = once,                                 \
 222         cx->sb_rxtainted        = rxtainted,                            \
 223         cx->sb_orig             = orig,                                 \
 224         cx->sb_dstr             = dstr,                                 \
 225         cx->sb_targ             = targ,                                 \
 226         cx->sb_s                = s,                                    \
 227         cx->sb_m                = m,                                    \
 228         cx->sb_strend           = strend,                               \
 229         cx->sb_rx               = rx,                                   \
 230         cx->cx_type             = CXt_SUBST
 231
 232 #define POPSUBST(cx) cxstack_ix--
 233
 234 struct context {
 235     I32         cx_type;        /* what kind of context this is */
 236     union {
 237         struct block    cx_blk;
 238         struct subst    cx_subst;
 239     } cx_u;
 240 };
 241 #define CXt_NULL        0
 242 #define CXt_SUB         1
 243 #define CXt_EVAL        2
 244 #define CXt_LOOP        3
 245 #define CXt_SUBST       4
 246 #define CXt_BLOCK       5
 247
 248 #define CXINC (cxstack_ix < cxstack_max ? ++cxstack_ix : (cxstack_ix = cxinc()))
 249
 250 /* "gimme" values */
 251 #define G_SCALAR        0
 252 #define G_ARRAY         1
 253
 254 /* extra flags for perl_call_* routines */
 255 #define G_DISCARD       2       /* Call FREETMPS. */
 256 #define G_EVAL          4       /* Assume eval {} around subroutine call. */
 257 #define G_NOARGS        8       /* Don't construct a @_ array. */
 258 #define G_KEEPERR      16       /* Append errors to $@ rather than overwriting it */