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- /* cop.h
- *
- * Copyright (c) 1991-1997, Larry Wall
- *
- * You may distribute under the terms of either the GNU General Public
- * License or the Artistic License, as specified in the README file.
- *
- */
-
- struct cop {
- BASEOP
- char * cop_label; /* label for this construct */
- HV * cop_stash; /* package line was compiled in */
- GV * cop_filegv; /* file the following line # is from */
- U32 cop_seq; /* parse sequence number */
- I32 cop_arybase; /* array base this line was compiled with */
- line_t cop_line; /* line # of this command */
- };
-
- #define Nullcop Null(COP*)
-
- /*
- * Here we have some enormously heavy (or at least ponderous) wizardry.
- */
-
- /* subroutine context */
- struct block_sub {
- CV * cv;
- GV * gv;
- GV * dfoutgv;
- #ifndef USE_THREADS
- AV * savearray;
- #endif /* USE_THREADS */
- AV * argarray;
- U16 olddepth;
- U8 hasargs;
- };
-
- #define PUSHSUB(cx) \
- cx->blk_sub.cv = cv; \
- cx->blk_sub.olddepth = CvDEPTH(cv); \
- cx->blk_sub.hasargs = hasargs;
-
- #define PUSHFORMAT(cx) \
- cx->blk_sub.cv = cv; \
- cx->blk_sub.gv = gv; \
- cx->blk_sub.hasargs = 0; \
- cx->blk_sub.dfoutgv = PL_defoutgv; \
- (void)SvREFCNT_inc(cx->blk_sub.dfoutgv)
-
- #define POPSUB(cx) \
- { struct block_sub cxsub; \
- POPSUB1(cx); \
- POPSUB2(); }
-
- #define POPSUB1(cx) \
- cxsub = cx->blk_sub; /* because DESTROY may clobber *cx */
-
- #ifdef USE_THREADS
- #define POPSAVEARRAY() NOOP
- #else
- #define POPSAVEARRAY() \
- STMT_START { \
- SvREFCNT_dec(GvAV(PL_defgv)); \
- GvAV(PL_defgv) = cxsub.savearray; \
- } STMT_END
- #endif /* USE_THREADS */
-
- #define POPSUB2() \
- if (cxsub.hasargs) { \
- POPSAVEARRAY(); \
- /* destroy arg array */ \
- av_clear(cxsub.argarray); \
- AvREAL_off(cxsub.argarray); \
- } \
- if (cxsub.cv) { \
- if (!(CvDEPTH(cxsub.cv) = cxsub.olddepth)) \
- SvREFCNT_dec(cxsub.cv); \
- }
-
- #define POPFORMAT(cx) \
- setdefout(cx->blk_sub.dfoutgv); \
- SvREFCNT_dec(cx->blk_sub.dfoutgv);
-
- /* eval context */
- struct block_eval {
- I32 old_in_eval;
- I32 old_op_type;
- char * old_name;
- OP * old_eval_root;
- SV * cur_text;
- };
-
- #define PUSHEVAL(cx,n,fgv) \
- cx->blk_eval.old_in_eval = PL_in_eval; \
- cx->blk_eval.old_op_type = PL_op->op_type; \
- cx->blk_eval.old_name = n; \
- cx->blk_eval.old_eval_root = PL_eval_root; \
- cx->blk_eval.cur_text = PL_linestr;
-
- #define POPEVAL(cx) \
- PL_in_eval = cx->blk_eval.old_in_eval; \
- optype = cx->blk_eval.old_op_type; \
- PL_eval_root = cx->blk_eval.old_eval_root;
-
- /* loop context */
- struct block_loop {
- char * label;
- I32 resetsp;
- OP * redo_op;
- OP * next_op;
- OP * last_op;
- SV ** itervar;
- SV * itersave;
- SV * iterlval;
- AV * iterary;
- IV iterix;
- IV itermax;
- };
-
- #define PUSHLOOP(cx, ivar, s) \
- cx->blk_loop.label = PL_curcop->cop_label; \
- cx->blk_loop.resetsp = s - PL_stack_base; \
- cx->blk_loop.redo_op = cLOOP->op_redoop; \
- cx->blk_loop.next_op = cLOOP->op_nextop; \
- cx->blk_loop.last_op = cLOOP->op_lastop; \
- if (cx->blk_loop.itervar = (ivar)) \
- cx->blk_loop.itersave = SvREFCNT_inc(*cx->blk_loop.itervar);\
- cx->blk_loop.iterlval = Nullsv; \
- cx->blk_loop.iterary = Nullav; \
- cx->blk_loop.iterix = -1;
-
- #define POPLOOP(cx) \
- { struct block_loop cxloop; \
- POPLOOP1(cx); \
- POPLOOP2(); }
-
- #define POPLOOP1(cx) \
- cxloop = cx->blk_loop; /* because DESTROY may clobber *cx */ \
- newsp = PL_stack_base + cxloop.resetsp;
-
- #define POPLOOP2() \
- SvREFCNT_dec(cxloop.iterlval); \
- if (cxloop.itervar) { \
- SvREFCNT_dec(*cxloop.itervar); \
- *cxloop.itervar = cxloop.itersave; \
- } \
- if (cxloop.iterary && cxloop.iterary != PL_curstack) \
- SvREFCNT_dec(cxloop.iterary);
-
- /* context common to subroutines, evals and loops */
- struct block {
- I32 blku_oldsp; /* stack pointer to copy stuff down to */
- COP * blku_oldcop; /* old curcop pointer */
- I32 blku_oldretsp; /* return stack index */
- I32 blku_oldmarksp; /* mark stack index */
- I32 blku_oldscopesp; /* scope stack index */
- PMOP * blku_oldpm; /* values of pattern match vars */
- U8 blku_gimme; /* is this block running in list context? */
-
- union {
- struct block_sub blku_sub;
- struct block_eval blku_eval;
- struct block_loop blku_loop;
- } blk_u;
- };
- #define blk_oldsp cx_u.cx_blk.blku_oldsp
- #define blk_oldcop cx_u.cx_blk.blku_oldcop
- #define blk_oldretsp cx_u.cx_blk.blku_oldretsp
- #define blk_oldmarksp cx_u.cx_blk.blku_oldmarksp
- #define blk_oldscopesp cx_u.cx_blk.blku_oldscopesp
- #define blk_oldpm cx_u.cx_blk.blku_oldpm
- #define blk_gimme cx_u.cx_blk.blku_gimme
- #define blk_sub cx_u.cx_blk.blk_u.blku_sub
- #define blk_eval cx_u.cx_blk.blk_u.blku_eval
- #define blk_loop cx_u.cx_blk.blk_u.blku_loop
-
- /* Enter a block. */
- #define PUSHBLOCK(cx,t,sp) CXINC, cx = &cxstack[cxstack_ix], \
- cx->cx_type = t, \
- cx->blk_oldsp = sp - PL_stack_base, \
- cx->blk_oldcop = PL_curcop, \
- cx->blk_oldmarksp = PL_markstack_ptr - PL_markstack, \
- cx->blk_oldscopesp = PL_scopestack_ix, \
- cx->blk_oldretsp = PL_retstack_ix, \
- cx->blk_oldpm = PL_curpm, \
- cx->blk_gimme = gimme; \
- DEBUG_l( PerlIO_printf(PerlIO_stderr(), "Entering block %ld, type %s\n", \
- (long)cxstack_ix, block_type[t]); )
-
- /* Exit a block (RETURN and LAST). */
- #define POPBLOCK(cx,pm) cx = &cxstack[cxstack_ix--], \
- newsp = PL_stack_base + cx->blk_oldsp, \
- PL_curcop = cx->blk_oldcop, \
- PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp, \
- PL_scopestack_ix = cx->blk_oldscopesp, \
- PL_retstack_ix = cx->blk_oldretsp, \
- pm = cx->blk_oldpm, \
- gimme = cx->blk_gimme; \
- DEBUG_l( PerlIO_printf(PerlIO_stderr(), "Leaving block %ld, type %s\n", \
- (long)cxstack_ix+1,block_type[cx->cx_type]); )
-
- /* Continue a block elsewhere (NEXT and REDO). */
- #define TOPBLOCK(cx) cx = &cxstack[cxstack_ix], \
- PL_stack_sp = PL_stack_base + cx->blk_oldsp, \
- PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp, \
- PL_scopestack_ix = cx->blk_oldscopesp, \
- PL_retstack_ix = cx->blk_oldretsp
-
- /* substitution context */
- struct subst {
- I32 sbu_iters;
- I32 sbu_maxiters;
- I32 sbu_safebase;
- I32 sbu_oldsave;
- bool sbu_once;
- bool sbu_rxtainted;
- char * sbu_orig;
- SV * sbu_dstr;
- SV * sbu_targ;
- char * sbu_s;
- char * sbu_m;
- char * sbu_strend;
- void * sbu_rxres;
- REGEXP * sbu_rx;
- };
- #define sb_iters cx_u.cx_subst.sbu_iters
- #define sb_maxiters cx_u.cx_subst.sbu_maxiters
- #define sb_safebase cx_u.cx_subst.sbu_safebase
- #define sb_oldsave cx_u.cx_subst.sbu_oldsave
- #define sb_once cx_u.cx_subst.sbu_once
- #define sb_rxtainted cx_u.cx_subst.sbu_rxtainted
- #define sb_orig cx_u.cx_subst.sbu_orig
- #define sb_dstr cx_u.cx_subst.sbu_dstr
- #define sb_targ cx_u.cx_subst.sbu_targ
- #define sb_s cx_u.cx_subst.sbu_s
- #define sb_m cx_u.cx_subst.sbu_m
- #define sb_strend cx_u.cx_subst.sbu_strend
- #define sb_rxres cx_u.cx_subst.sbu_rxres
- #define sb_rx cx_u.cx_subst.sbu_rx
-
- #define PUSHSUBST(cx) CXINC, cx = &cxstack[cxstack_ix], \
- cx->sb_iters = iters, \
- cx->sb_maxiters = maxiters, \
- cx->sb_safebase = safebase, \
- cx->sb_oldsave = oldsave, \
- cx->sb_once = once, \
- cx->sb_rxtainted = rxtainted, \
- cx->sb_orig = orig, \
- cx->sb_dstr = dstr, \
- cx->sb_targ = targ, \
- cx->sb_s = s, \
- cx->sb_m = m, \
- cx->sb_strend = strend, \
- cx->sb_rxres = Null(void*), \
- cx->sb_rx = rx, \
- cx->cx_type = CXt_SUBST; \
- rxres_save(&cx->sb_rxres, rx)
-
- #define POPSUBST(cx) cx = &cxstack[cxstack_ix--]; \
- rxres_free(&cx->sb_rxres)
-
- struct context {
- I32 cx_type; /* what kind of context this is */
- union {
- struct block cx_blk;
- struct subst cx_subst;
- } cx_u;
- };
- #define CXt_NULL 0
- #define CXt_SUB 1
- #define CXt_EVAL 2
- #define CXt_LOOP 3
- #define CXt_SUBST 4
- #define CXt_BLOCK 5
-
- #define CXINC (cxstack_ix < cxstack_max ? ++cxstack_ix : (cxstack_ix = cxinc()))
-
- /* "gimme" values */
- #define G_SCALAR 0
- #define G_ARRAY 1
- #define G_VOID 128 /* skip this bit when adding flags below */
-
- /* extra flags for perl_call_* routines */
- #define G_DISCARD 2 /* Call FREETMPS. */
- #define G_EVAL 4 /* Assume eval {} around subroutine call. */
- #define G_NOARGS 8 /* Don't construct a @_ array. */
- #define G_KEEPERR 16 /* Append errors to $@, don't overwrite it */
- #define G_NODEBUG 32 /* Disable debugging at toplevel. */
-
- /* Support for switching (stack and block) contexts.
- * This ensures magic doesn't invalidate local stack and cx pointers.
- */
-
- #define PERLSI_UNKNOWN -1
- #define PERLSI_UNDEF 0
- #define PERLSI_MAIN 1
- #define PERLSI_MAGIC 2
- #define PERLSI_SORT 3
- #define PERLSI_SIGNAL 4
- #define PERLSI_OVERLOAD 5
- #define PERLSI_DESTROY 6
- #define PERLSI_WARNHOOK 7
- #define PERLSI_DIEHOOK 8
- #define PERLSI_REQUIRE 9
-
- struct stackinfo {
- AV * si_stack; /* stack for current runlevel */
- PERL_CONTEXT * si_cxstack; /* context stack for runlevel */
- I32 si_cxix; /* current context index */
- I32 si_cxmax; /* maximum allocated index */
- I32 si_type; /* type of runlevel */
- struct stackinfo * si_prev;
- struct stackinfo * si_next;
- I32 * si_markbase; /* where markstack begins for us.
- * currently used only with DEBUGGING,
- * but not #ifdef-ed for bincompat */
- };
-
- typedef struct stackinfo PERL_SI;
-
- #define cxstack (PL_curstackinfo->si_cxstack)
- #define cxstack_ix (PL_curstackinfo->si_cxix)
- #define cxstack_max (PL_curstackinfo->si_cxmax)
-
- #ifdef DEBUGGING
- # define SET_MARKBASE PL_curstackinfo->si_markbase = PL_markstack_ptr
- #else
- # define SET_MARKBASE NOOP
- #endif
-
- #define PUSHSTACKi(type) \
- STMT_START { \
- PERL_SI *next = PL_curstackinfo->si_next; \
- if (!next) { \
- next = new_stackinfo(32, 2048/sizeof(PERL_CONTEXT) - 1); \
- next->si_prev = PL_curstackinfo; \
- PL_curstackinfo->si_next = next; \
- } \
- next->si_type = type; \
- next->si_cxix = -1; \
- AvFILLp(next->si_stack) = 0; \
- SWITCHSTACK(PL_curstack,next->si_stack); \
- PL_curstackinfo = next; \
- SET_MARKBASE; \
- } STMT_END
-
- #define PUSHSTACK PUSHSTACKi(PERLSI_UNKNOWN)
-
- #define POPSTACK \
- STMT_START { \
- PERL_SI *prev = PL_curstackinfo->si_prev; \
- if (!prev) { \
- PerlIO_printf(PerlIO_stderr(), "panic: POPSTACK\n"); \
- my_exit(1); \
- } \
- SWITCHSTACK(PL_curstack,prev->si_stack); \
- /* don't free prev here, free them all at the END{} */ \
- PL_curstackinfo = prev; \
- } STMT_END
-
- #define POPSTACK_TO(s) \
- STMT_START { \
- while (PL_curstack != s) { \
- dounwind(-1); \
- POPSTACK; \
- } \
- } STMT_END
-