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tag: perl-5.9.5
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/* cop.h
*
* Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
* 2000, 2001, 2002, 2003, 2004, 2005, 2006 by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
* Control ops (cops) are one of the three ops OP_NEXTSTATE, OP_DBSTATE,
* and OP_SETSTATE that (loosely speaking) are separate statements.
* They hold information important for lexical state and error reporting.
* At run time, PL_curcop is set to point to the most recently executed cop,
* and thus can be used to determine our current state.
*/

/* A jmpenv packages the state required to perform a proper non-local jump.
* Note that there is a start_env initialized when perl starts, and top_env
* points to this initially, so top_env should always be non-null.
*
* Existence of a non-null top_env->je_prev implies it is valid to call
* longjmp() at that runlevel (we make sure start_env.je_prev is always
* null to ensure this).
*
* je_mustcatch, when set at any runlevel to TRUE, means eval ops must
* establish a local jmpenv to handle exception traps. Care must be taken
* to restore the previous value of je_mustcatch before exiting the
* stack frame iff JMPENV_PUSH was not called in that stack frame.
* GSAR 97-03-27
*/

struct jmpenv {
    struct jmpenv * je_prev;
    Sigjmp_buf je_buf; /* only for use if !je_throw */
    int je_ret; /* last exception thrown */
    bool je_mustcatch; /* need to call longjmp()? */
};

typedef struct jmpenv JMPENV;

#ifdef OP_IN_REGISTER
#define OP_REG_TO_MEM PL_opsave = op
#define OP_MEM_TO_REG op = PL_opsave
#else
#define OP_REG_TO_MEM NOOP
#define OP_MEM_TO_REG NOOP
#endif

/*
* How to build the first jmpenv.
*
* top_env needs to be non-zero. It points to an area
* in which longjmp() stuff is stored, as C callstack
* info there at least is thread specific this has to
* be per-thread. Otherwise a 'die' in a thread gives
* that thread the C stack of last thread to do an eval {}!
*/

#define JMPENV_BOOTSTRAP \
STMT_START { \
Zero(&PL_start_env, 1, JMPENV); \
PL_start_env.je_ret = -1; \
PL_start_env.je_mustcatch = TRUE; \
PL_top_env = &PL_start_env; \
} STMT_END

/*
* PERL_FLEXIBLE_EXCEPTIONS
*
* All the flexible exceptions code has been removed.
* See the following threads for details:
*
* http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2004-07/msg00378.html
*
* Joshua's original patches (which weren't applied) and discussion:
*
* http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg01396.html
* http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg01489.html
* http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg01491.html
* http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg01608.html
* http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg02144.html
* http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg02998.html
*
* Chip's reworked patch and discussion:
*
* http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1999-03/msg00520.html
*
* The flaw in these patches (which went unnoticed at the time) was
* that they moved some code that could potentially die() out of the
* region protected by the setjmp()s. This caused exceptions within
* END blocks and such to not be handled by the correct setjmp().
*
* The original patches that introduces flexible exceptions were:
*
* http://public.activestate.com/cgi-bin/perlbrowse?patch=3386
* http://public.activestate.com/cgi-bin/perlbrowse?patch=5162
*/

#define dJMPENV JMPENV cur_env

#define JMPENV_PUSH(v) \
STMT_START { \
DEBUG_l(Perl_deb(aTHX_ "Setting up jumplevel %p, was %p\n", \
(void*)&cur_env, (void*)PL_top_env)); \
cur_env.je_prev = PL_top_env; \
OP_REG_TO_MEM; \
cur_env.je_ret = PerlProc_setjmp(cur_env.je_buf, SCOPE_SAVES_SIGNAL_MASK); \
OP_MEM_TO_REG; \
PL_top_env = &cur_env; \
cur_env.je_mustcatch = FALSE; \
(v) = cur_env.je_ret; \
} STMT_END

#define JMPENV_POP \
STMT_START { \
DEBUG_l(Perl_deb(aTHX_ "popping jumplevel was %p, now %p\n", \
(void*)PL_top_env, (void*)cur_env.je_prev)); \
PL_top_env = cur_env.je_prev; \
} STMT_END

#define JMPENV_JUMP(v) \
STMT_START { \
OP_REG_TO_MEM; \
if (PL_top_env->je_prev) \
PerlProc_longjmp(PL_top_env->je_buf, (v)); \
if ((v) == 2) \
PerlProc_exit(STATUS_EXIT); \
PerlIO_printf(PerlIO_stderr(), "panic: top_env\n"); \
PerlProc_exit(1); \
} STMT_END

#define CATCH_GET (PL_top_env->je_mustcatch)
#define CATCH_SET(v) (PL_top_env->je_mustcatch = (v))



struct cop {
    BASEOP
    /* On LP64 putting this here takes advantage of the fact that BASEOP isn't
an exact multiple of 8 bytes to save structure padding. */
    line_t cop_line; /* line # of this command */
    char * cop_label; /* label for this construct */
#ifdef USE_ITHREADS
    char * cop_stashpv; /* package line was compiled in */
    char * cop_file; /* file name the following line # is from */
#else
    HV * cop_stash; /* package line was compiled in */
    GV * cop_filegv; /* file the following line # is from */
#endif
    U32 cop_hints; /* hints bits from pragmata */
    U32 cop_seq; /* parse sequence number */
    /* Beware. mg.c and warnings.pl assume the type of this is STRLEN *: */
    STRLEN * cop_warnings; /* lexical warnings bitmask */
    /* compile time state of %^H. See the comment in op.c for how this is
used to recreate a hash to return from caller. */
    struct refcounted_he * cop_hints_hash;
};

#ifdef USE_ITHREADS
# define CopFILE(c) ((c)->cop_file)
# define CopFILEGV(c) (CopFILE(c) \
? gv_fetchfile(CopFILE(c)) : NULL)
# ifdef NETWARE
# define CopFILE_set(c,pv) ((c)->cop_file = savepv(pv))
# define CopFILE_setn(c,pv,l) ((c)->cop_file = savepv((pv),(l)))
# else
# define CopFILE_set(c,pv) ((c)->cop_file = savesharedpv(pv))
# define CopFILE_setn(c,pv,l) ((c)->cop_file = savesharedpvn((pv),(l)))
# endif

# define CopFILESV(c) (CopFILE(c) \
? GvSV(gv_fetchfile(CopFILE(c))) : NULL)
# define CopFILEAV(c) (CopFILE(c) \
? GvAV(gv_fetchfile(CopFILE(c))) : NULL)
# ifdef DEBUGGING
# define CopFILEAVx(c) (assert(CopFILE(c)), \
GvAV(gv_fetchfile(CopFILE(c))))
# else
# define CopFILEAVx(c) (GvAV(gv_fetchfile(CopFILE(c))))
# endif
# define CopSTASHPV(c) ((c)->cop_stashpv)

# ifdef NETWARE
# define CopSTASHPV_set(c,pv) ((c)->cop_stashpv = ((pv) ? savepv(pv) : NULL))
# else
# define CopSTASHPV_set(c,pv) ((c)->cop_stashpv = savesharedpv(pv))
# endif

# define CopSTASH(c) (CopSTASHPV(c) \
? gv_stashpv(CopSTASHPV(c),GV_ADD) : NULL)
# define CopSTASH_set(c,hv) CopSTASHPV_set(c, (hv) ? HvNAME_get(hv) : NULL)
# define CopSTASH_eq(c,hv) ((hv) && stashpv_hvname_match(c,hv))
# define CopLABEL(c) ((c)->cop_label)
# define CopLABEL_set(c,pv) (CopLABEL(c) = (pv))
# ifdef NETWARE
# define CopSTASH_free(c) SAVECOPSTASH_FREE(c)
# define CopFILE_free(c) SAVECOPFILE_FREE(c)
# define CopLABEL_free(c) SAVECOPLABEL_FREE(c)
# define CopLABEL_alloc(pv) ((pv)?savepv(pv):NULL)
# else
# define CopSTASH_free(c) PerlMemShared_free(CopSTASHPV(c))
# define CopFILE_free(c) (PerlMemShared_free(CopFILE(c)),(CopFILE(c) = NULL))
# define CopLABEL_free(c) (PerlMemShared_free(CopLABEL(c)),(CopLABEL(c) = NULL))
# define CopLABEL_alloc(pv) ((pv)?savesharedpv(pv):NULL)
# endif
#else
# define CopFILEGV(c) ((c)->cop_filegv)
# define CopFILEGV_set(c,gv) ((c)->cop_filegv = (GV*)SvREFCNT_inc(gv))
# define CopFILE_set(c,pv) CopFILEGV_set((c), gv_fetchfile(pv))
# define CopFILE_setn(c,pv,l) CopFILEGV_set((c), gv_fetchfile_flags((pv),(l),0))
# define CopFILESV(c) (CopFILEGV(c) ? GvSV(CopFILEGV(c)) : NULL)
# define CopFILEAV(c) (CopFILEGV(c) ? GvAV(CopFILEGV(c)) : NULL)
# ifdef DEBUGGING
# define CopFILEAVx(c) (assert(CopFILEGV(c)), GvAV(CopFILEGV(c)))
# else
# define CopFILEAVx(c) (GvAV(CopFILEGV(c)))
# endif
# define CopFILE(c) (CopFILEGV(c) && GvSV(CopFILEGV(c)) \
? SvPVX(GvSV(CopFILEGV(c))) : NULL)
# define CopSTASH(c) ((c)->cop_stash)
# define CopLABEL(c) ((c)->cop_label)
# define CopSTASH_set(c,hv) ((c)->cop_stash = (hv))
# define CopSTASHPV(c) (CopSTASH(c) ? HvNAME_get(CopSTASH(c)) : NULL)
   /* cop_stash is not refcounted */
# define CopSTASHPV_set(c,pv) CopSTASH_set((c), gv_stashpv(pv,GV_ADD))
# define CopSTASH_eq(c,hv) (CopSTASH(c) == (hv))
# define CopLABEL_alloc(pv) ((pv)?savepv(pv):NULL)
# define CopLABEL_set(c,pv) (CopLABEL(c) = (pv))
# define CopSTASH_free(c)
# define CopFILE_free(c) (SvREFCNT_dec(CopFILEGV(c)),(CopFILEGV(c) = NULL))
# define CopLABEL_free(c) (Safefree(CopLABEL(c)),(CopLABEL(c) = NULL))

#endif /* USE_ITHREADS */

#define CopSTASH_ne(c,hv) (!CopSTASH_eq(c,hv))
#define CopLINE(c) ((c)->cop_line)
#define CopLINE_inc(c) (++CopLINE(c))
#define CopLINE_dec(c) (--CopLINE(c))
#define CopLINE_set(c,l) (CopLINE(c) = (l))

/* OutCopFILE() is CopFILE for output (caller, die, warn, etc.) */
#ifdef MACOS_TRADITIONAL
# define OutCopFILE(c) MacPerl_MPWFileName(CopFILE(c))
#else
# define OutCopFILE(c) CopFILE(c)
#endif

/* If $[ is non-zero, it's stored in cop_hints under the key "$[", and
HINT_ARYBASE is set to indicate this.
Setting it is ineficient due to the need to create 2 mortal SVs, but as
using $[ is highly discouraged, no sane Perl code will be using it. */
#define CopARYBASE_get(c) \
((CopHINTS_get(c) & HINT_ARYBASE) \
? SvIV(Perl_refcounted_he_fetch(aTHX_ (c)->cop_hints_hash, 0, \
"$[", 2, 0, 0)) \
: 0)
#define CopARYBASE_set(c, b) STMT_START { \
if (b || ((c)->cop_hints & HINT_ARYBASE)) { \
(c)->cop_hints |= HINT_ARYBASE; \
if ((c) == &PL_compiling) \
PL_hints |= HINT_LOCALIZE_HH | HINT_ARYBASE; \
(c)->cop_hints_hash \
= Perl_refcounted_he_new(aTHX_ (c)->cop_hints_hash, \
sv_2mortal(newSVpvs("$[")), \
sv_2mortal(newSViv(b))); \
} \
} STMT_END

/* FIXME NATIVE_HINTS if this is changed from op_private (see perl.h) */
#define CopHINTS_get(c) ((c)->cop_hints + 0)
#define CopHINTS_set(c, h) STMT_START { \
(c)->cop_hints = (h); \
} STMT_END

/*
* Here we have some enormously heavy (or at least ponderous) wizardry.
*/

/* subroutine context */
struct block_sub {
    CV * cv;
    GV * gv;
    GV * dfoutgv;
    AV * savearray;
    AV * argarray;
    I32 olddepth;
    U8 hasargs;
    U8 lval; /* XXX merge lval and hasargs? */
    PAD *oldcomppad;
    OP * retop; /* op to execute on exit from sub */
};

/* base for the next two macros. Don't use directly.
* Note that the refcnt of the cv is incremented twice; The CX one is
* decremented by LEAVESUB, the other by LEAVE. */

#define PUSHSUB_BASE(cx) \
cx->blk_sub.cv = cv; \
cx->blk_sub.olddepth = CvDEPTH(cv); \
cx->blk_sub.hasargs = hasargs; \
cx->blk_sub.retop = NULL; \
if (!CvDEPTH(cv)) { \
SvREFCNT_inc_simple_void_NN(cv); \
SvREFCNT_inc_simple_void_NN(cv); \
SAVEFREESV(cv); \
}


#define PUSHSUB(cx) \
PUSHSUB_BASE(cx) \
cx->blk_sub.lval = PL_op->op_private & \
(OPpLVAL_INTRO|OPpENTERSUB_INARGS);

/* variant for use by OP_DBSTATE, where op_private holds hint bits */
#define PUSHSUB_DB(cx) \
PUSHSUB_BASE(cx) \
cx->blk_sub.lval = 0;


#define PUSHFORMAT(cx) \
cx->blk_sub.cv = cv; \
cx->blk_sub.gv = gv; \
cx->blk_sub.retop = NULL; \
cx->blk_sub.hasargs = 0; \
cx->blk_sub.dfoutgv = PL_defoutgv; \
SvREFCNT_inc_void(cx->blk_sub.dfoutgv)

#define POP_SAVEARRAY() \
STMT_START { \
SvREFCNT_dec(GvAV(PL_defgv)); \
GvAV(PL_defgv) = cx->blk_sub.savearray; \
} STMT_END

/* junk in @_ spells trouble when cloning CVs and in pp_caller(), so don't
* leave any (a fast av_clear(ary), basically) */
#define CLEAR_ARGARRAY(ary) \
STMT_START { \
AvMAX(ary) += AvARRAY(ary) - AvALLOC(ary); \
AvARRAY(ary) = AvALLOC(ary); \
AvFILLp(ary) = -1; \
} STMT_END

#define POPSUB(cx,sv) \
STMT_START { \
if (cx->blk_sub.hasargs) { \
POP_SAVEARRAY(); \
/* abandon @_ if it got reified */ \
if (AvREAL(cx->blk_sub.argarray)) { \
const SSize_t fill = AvFILLp(cx->blk_sub.argarray); \
SvREFCNT_dec(cx->blk_sub.argarray); \
cx->blk_sub.argarray = newAV(); \
av_extend(cx->blk_sub.argarray, fill); \
AvREIFY_only(cx->blk_sub.argarray); \
CX_CURPAD_SV(cx->blk_sub, 0) = (SV*)cx->blk_sub.argarray; \
} \
else { \
CLEAR_ARGARRAY(cx->blk_sub.argarray); \
} \
} \
sv = (SV*)cx->blk_sub.cv; \
if (sv && (CvDEPTH((CV*)sv) = cx->blk_sub.olddepth)) \
sv = NULL; \
} STMT_END

#define LEAVESUB(sv) \
STMT_START { \
if (sv) \
SvREFCNT_dec(sv); \
} STMT_END

#define POPFORMAT(cx) \
setdefout(cx->blk_sub.dfoutgv); \
SvREFCNT_dec(cx->blk_sub.dfoutgv);

/* eval context */
struct block_eval {
    U8 old_in_eval;
    U16 old_op_type;
    SV * old_namesv;
    OP * old_eval_root;
    SV * cur_text;
    CV * cv;
    OP * retop; /* op to execute on exit from eval */
    JMPENV * cur_top_env; /* value of PL_top_env when eval CX created */
};

#define PUSHEVAL(cx,n,fgv) \
STMT_START { \
cx->blk_eval.old_in_eval = PL_in_eval; \
cx->blk_eval.old_op_type = PL_op->op_type; \
cx->blk_eval.old_namesv = (n ? newSVpv(n,0) : NULL); \
cx->blk_eval.old_eval_root = PL_eval_root; \
cx->blk_eval.cur_text = PL_parser ? PL_parser->linestr : NULL; \
cx->blk_eval.cv = NULL; /* set by doeval(), as applicable */ \
cx->blk_eval.retop = NULL; \
cx->blk_eval.cur_top_env = PL_top_env; \
} STMT_END

#define POPEVAL(cx) \
STMT_START { \
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; \
if (cx->blk_eval.old_namesv) \
sv_2mortal(cx->blk_eval.old_namesv); \
} STMT_END

/* loop context */
struct block_loop {
    char * label;
    I32 resetsp;
    LOOP * my_op; /* My op, that contains redo, next and last ops. */
    /* (except for non_ithreads we need to modify next_op in pp_ctl.c, hence
why next_op is conditionally defined below.) */
#ifdef USE_ITHREADS
    void * iterdata;
    PAD *oldcomppad;
#else
    OP * next_op;
    SV ** itervar;
#endif
    SV * itersave;
    /* (from inspection of source code) for a .. range of strings this is the
current string. */
    SV * iterlval;
    /* (from inspection of source code) for a foreach loop this is the array
being iterated over. For a .. range of numbers it's the current value.
A check is often made on the SvTYPE of iterary to determine whether
we are iterating over an array or a range. (numbers or strings) */
    AV * iterary;
    IV iterix;
    /* (from inspection of source code) for a .. range of numbers this is the
maximum value. */
    IV itermax;
};
/* It might be possible to squeeze this structure further. As best I can tell
itermax and iterlval are never used at the same time, so it might be possible
to make them into a union. However, I'm not confident that there are enough
flag bits/NULLable pointers in this structure alone to encode which is
active. There is, however, U8 of space free in struct block, which could be
used. Right now it may not be worth squeezing this structure further, as it's
the largest part of struct block, and currently struct block is 64 bytes on
an ILP32 system, which will give good cache alignment.
*/

#ifdef USE_ITHREADS
# define CxITERVAR(c) \
((c)->blk_loop.iterdata \
? (CxPADLOOP(cx) \
? &CX_CURPAD_SV( (c)->blk_loop, \
INT2PTR(PADOFFSET, (c)->blk_loop.iterdata)) \
: &GvSV((GV*)(c)->blk_loop.iterdata)) \
: (SV**)NULL)
# define CX_ITERDATA_SET(cx,idata) \
CX_CURPAD_SAVE(cx->blk_loop); \
if ((cx->blk_loop.iterdata = (idata))) \
cx->blk_loop.itersave = SvREFCNT_inc(*CxITERVAR(cx)); \
else \
cx->blk_loop.itersave = NULL;
#else
# define CxITERVAR(c) ((c)->blk_loop.itervar)
# define CX_ITERDATA_SET(cx,ivar) \
if ((cx->blk_loop.itervar = (SV**)(ivar))) \
cx->blk_loop.itersave = SvREFCNT_inc(*CxITERVAR(cx)); \
else \
cx->blk_loop.itersave = NULL;
#endif

#ifdef USE_ITHREADS
# define PUSHLOOP_OP_NEXT /* No need to do anything. */
# define CX_LOOP_NEXTOP_GET(cx) ((cx)->blk_loop.my_op->op_nextop + 0)
#else
# define PUSHLOOP_OP_NEXT cx->blk_loop.next_op = cLOOP->op_nextop
# define CX_LOOP_NEXTOP_GET(cx) ((cx)->blk_loop.next_op + 0)
#endif

#define PUSHLOOP(cx, dat, s) \
cx->blk_loop.label = PL_curcop->cop_label; \
cx->blk_loop.resetsp = s - PL_stack_base; \
cx->blk_loop.my_op = cLOOP; \
PUSHLOOP_OP_NEXT; \
cx->blk_loop.iterlval = NULL; \
cx->blk_loop.iterary = NULL; \
cx->blk_loop.iterix = -1; \
CX_ITERDATA_SET(cx,dat);

#define POPLOOP(cx) \
SvREFCNT_dec(cx->blk_loop.iterlval); \
if (CxITERVAR(cx)) { \
if (SvPADMY(cx->blk_loop.itersave)) { \
SV ** const s_v_p = CxITERVAR(cx); \
sv_2mortal(*s_v_p); \
*s_v_p = cx->blk_loop.itersave; \
} \
else { \
SvREFCNT_dec(cx->blk_loop.itersave); \
} \
} \
if (cx->blk_loop.iterary && cx->blk_loop.iterary != PL_curstack)\
SvREFCNT_dec(cx->blk_loop.iterary);

/* given/when context */
struct block_givwhen {
OP *leave_op;
};

#define PUSHGIVEN(cx) \
cx->blk_givwhen.leave_op = cLOGOP->op_other;

#define PUSHWHEN PUSHGIVEN

/* context common to subroutines, evals and loops */
struct block {
    U16 blku_type; /* what kind of context this is */
    U8 blku_gimme; /* is this block running in list context? */
    U8 blku_spare; /* Padding to match with struct subst */
    I32 blku_oldsp; /* stack pointer to copy stuff down to */
    COP * blku_oldcop; /* old curcop pointer */
    I32 blku_oldmarksp; /* mark stack index */
    I32 blku_oldscopesp; /* scope stack index */
    PMOP * blku_oldpm; /* values of pattern match vars */

    union {
struct block_sub blku_sub;
struct block_eval blku_eval;
struct block_loop blku_loop;
struct block_givwhen blku_givwhen;
    } blk_u;
};
#define blk_oldsp cx_u.cx_blk.blku_oldsp
#define blk_oldcop cx_u.cx_blk.blku_oldcop
#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
#define blk_givwhen cx_u.cx_blk.blk_u.blku_givwhen

/* 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_oldpm = PL_curpm, \
cx->blk_gimme = (U8)gimme; \
DEBUG_l( PerlIO_printf(Perl_debug_log, "Entering block %ld, type %s\n", \
(long)cxstack_ix, PL_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, \
pm = cx->blk_oldpm, \
gimme = cx->blk_gimme; \
DEBUG_SCOPE("POPBLOCK"); \
DEBUG_l( PerlIO_printf(Perl_debug_log, "Leaving block %ld, type %s\n", \
(long)cxstack_ix+1,PL_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_curpm = cx->blk_oldpm; \
DEBUG_SCOPE("TOPBLOCK");

/* substitution context */
struct subst {
    U16 sbu_type; /* what kind of context this is */
    U8 sbu_once; /* Actually both booleans, but U8 to matches */
    U8 sbu_rxtainted; /* struct block */
    I32 sbu_iters;
    I32 sbu_maxiters;
    I32 sbu_rflags;
    I32 sbu_oldsave;
    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_rflags cx_u.cx_subst.sbu_rflags
#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_rflags = r_flags, \
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, \
cx->sb_rx = rx, \
cx->cx_type = CXt_SUBST; \
rxres_save(&cx->sb_rxres, rx); \
(void)ReREFCNT_inc(rx)

#define POPSUBST(cx) cx = &cxstack[cxstack_ix--]; \
rxres_free(&cx->sb_rxres); \
ReREFCNT_dec(cx->sb_rx)

struct context {
    union {
struct block cx_blk;
struct subst cx_subst;
    } cx_u;
};
#define cx_type cx_u.cx_subst.sbu_type

#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
#define CXt_FORMAT 6
#define CXt_GIVEN 7
#define CXt_WHEN 8

/* private flags for CXt_SUB and CXt_NULL */
#define CXp_MULTICALL 0x00000400 /* part of a multicall (so don't
tear down context on exit). */

/* private flags for CXt_EVAL */
#define CXp_REAL 0x00000100 /* truly eval'', not a lookalike */
#define CXp_TRYBLOCK 0x00000200 /* eval{}, not eval'' or similar */

/* private flags for CXt_LOOP */
#define CXp_FOREACH 0x00000200 /* a foreach loop */
#define CXp_FOR_DEF 0x00000400 /* foreach using $_ */
#ifdef USE_ITHREADS
# define CXp_PADVAR 0x00000100 /* itervar lives on pad, iterdata
has pad offset; if not set,
iterdata holds GV* */
# define CxPADLOOP(c) (((c)->cx_type & (CXt_LOOP|CXp_PADVAR)) \
== (CXt_LOOP|CXp_PADVAR))
#endif

#define CxTYPE(c) ((c)->cx_type & CXTYPEMASK)
#define CxMULTICALL(c) (((c)->cx_type & CXp_MULTICALL) \
== CXp_MULTICALL)
#define CxREALEVAL(c) (((c)->cx_type & (CXt_EVAL|CXp_REAL)) \
== (CXt_EVAL|CXp_REAL))
#define CxTRYBLOCK(c) (((c)->cx_type & (CXt_EVAL|CXp_TRYBLOCK)) \
== (CXt_EVAL|CXp_TRYBLOCK))
#define CxFOREACH(c) (((c)->cx_type & (CXt_LOOP|CXp_FOREACH)) \
== (CXt_LOOP|CXp_FOREACH))
#define CxFOREACHDEF(c) (((c)->cx_type & (CXt_LOOP|CXp_FOREACH|CXp_FOR_DEF))\
== (CXt_LOOP|CXp_FOREACH|CXp_FOR_DEF))

#define CXINC (cxstack_ix < cxstack_max ? ++cxstack_ix : (cxstack_ix = cxinc()))

/*
=head1 "Gimme" Values
*/

/*
=for apidoc AmU||G_SCALAR
Used to indicate scalar context. See C<GIMME_V>, C<GIMME>, and
L<perlcall>.

=for apidoc AmU||G_ARRAY
Used to indicate list context. See C<GIMME_V>, C<GIMME> and
L<perlcall>.

=for apidoc AmU||G_VOID
Used to indicate void context. See C<GIMME_V> and L<perlcall>.

=for apidoc AmU||G_DISCARD
Indicates that arguments returned from a callback should be discarded. See
L<perlcall>.

=for apidoc AmU||G_EVAL

Used to force a Perl C<eval> wrapper around a callback. See
L<perlcall>.

=for apidoc AmU||G_NOARGS

Indicates that no arguments are being sent to a callback. See
L<perlcall>.

=cut
*/

#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. */
#define G_METHOD 64 /* Calling method. */
#define G_FAKINGEVAL 256 /* Faking an eval context for call_sv or
fold_constants. */

/* flag bits for PL_in_eval */
#define EVAL_NULL 0 /* not in an eval */
#define EVAL_INEVAL 1 /* some enclosing scope is an eval */
#define EVAL_WARNONLY 2 /* used by yywarn() when calling yyerror() */
#define EVAL_KEEPERR 4 /* set by Perl_call_sv if G_KEEPERR */
#define EVAL_INREQUIRE 8 /* The code is being required. */

/* 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 */
    struct stackinfo * si_prev;
    struct stackinfo * si_next;
    I32 si_cxix; /* current context index */
    I32 si_cxmax; /* maximum allocated index */
    I32 si_type; /* type of runlevel */
    I32 si_markoff; /* offset 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_MARK_OFFSET \
PL_curstackinfo->si_markoff = PL_markstack_ptr - PL_markstack
#else
# define SET_MARK_OFFSET 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_MARK_OFFSET; \
} STMT_END

#define PUSHSTACK PUSHSTACKi(PERLSI_UNKNOWN)

/* POPSTACK works with PL_stack_sp, so it may need to be bracketed by
* PUTBACK/SPAGAIN to flush/refresh any local SP that may be active */
#define POPSTACK \
STMT_START { \
dSP; \
PERL_SI * const prev = PL_curstackinfo->si_prev; \
if (!prev) { \
PerlIO_printf(Perl_error_log, "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

#define IN_PERL_COMPILETIME (PL_curcop == &PL_compiling)
#define IN_PERL_RUNTIME (PL_curcop != &PL_compiling)

/*
=head1 Multicall Functions

=for apidoc Ams||dMULTICALL
Declare local variables for a multicall. See L<perlcall/Lightweight Callbacks>.

=for apidoc Ams||PUSH_MULTICALL
Opening bracket for a lightweight callback.
See L<perlcall/Lightweight Callbacks>.

=for apidoc Ams||MULTICALL
Make a lightweight callback. See L<perlcall/Lightweight Callbacks>.

=for apidoc Ams||POP_MULTICALL
Closing bracket for a lightweight callback.
See L<perlcall/Lightweight Callbacks>.

=cut
*/

#define dMULTICALL \
SV **newsp; /* set by POPBLOCK */ \
PERL_CONTEXT *cx; \
CV *multicall_cv; \
OP *multicall_cop; \
bool multicall_oldcatch; \
U8 hasargs = 0 /* used by PUSHSUB */

#define PUSH_MULTICALL(the_cv) \
STMT_START { \
CV * const _nOnclAshIngNamE_ = the_cv; \
CV * const cv = _nOnclAshIngNamE_; \
AV * const padlist = CvPADLIST(cv); \
ENTER; \
multicall_oldcatch = CATCH_GET; \
SAVETMPS; SAVEVPTR(PL_op); \
CATCH_SET(TRUE); \
PUSHBLOCK(cx, CXt_SUB|CXp_MULTICALL, PL_stack_sp); \
PUSHSUB(cx); \
if (++CvDEPTH(cv) >= 2) { \
PERL_STACK_OVERFLOW_CHECK(); \
Perl_pad_push(aTHX_ padlist, CvDEPTH(cv)); \
} \
SAVECOMPPAD(); \
PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv)); \
multicall_cv = cv; \
multicall_cop = CvSTART(cv); \
} STMT_END

#define MULTICALL \
STMT_START { \
PL_op = multicall_cop; \
CALLRUNOPS(aTHX); \
} STMT_END

#define POP_MULTICALL \
STMT_START { \
LEAVESUB(multicall_cv); \
CvDEPTH(multicall_cv)--; \
POPBLOCK(cx,PL_curpm); \
CATCH_SET(multicall_oldcatch); \
LEAVE; \
} STMT_END

/*
* Local variables:
* c-indentation-style: bsd
* c-basic-offset: 4
* indent-tabs-mode: t
* End:
*
* ex: set ts=8 sts=4 sw=4 noet:
*/
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