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tag: perl-5.005_03
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/* cop.h
*
* Copyright (c) 1991-1999, 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) { \
sv_2mortal(*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[CxTYPE(cx)]); )

/* 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[CxTYPE(cx)]); )

/* 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, \
PL_curpm = cx->blk_oldpm

/* 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 {
    U32 cx_type; /* what kind of context this is */
    union {
struct block cx_blk;
struct subst cx_subst;
    } cx_u;
};

#define CXTYPEMASK 0xff
#define CXt_NULL 0
#define CXt_SUB 1
#define CXt_EVAL 2
#define CXt_LOOP 3
#define CXt_SUBST 4
#define CXt_BLOCK 5

/* private flags for CXt_EVAL */
#define CXp_REAL 0x00000100 /* truly eval'', not a lookalike */

#define CxTYPE(c) ((c)->cx_type & CXTYPEMASK)
#define CxREALEVAL(c) (((c)->cx_type & (CXt_EVAL|CXp_REAL)) == (CXt_EVAL|CXp_REAL))

#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
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