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/* cop.h
*
* Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
* 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 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 two ops OP_NEXTSTATE and OP_DBSTATE,
* 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 PL_start_env initialized when perl starts, and
* PL_top_env points to this initially, so PL_top_env should always be
* non-null.
*
* Existence of a non-null PL_top_env->je_prev implies it is valid to call
* longjmp() at that runlevel (we make sure PL_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({ \
int i = 0; JMPENV *p = PL_top_env; \
while (p) { i++; p = p->je_prev; } \
Perl_deb(aTHX_ "JUMPENV_PUSH level=%d at %s:%d\n", \
i, __FILE__, __LINE__);}) \
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({ \
int i = -1; JMPENV *p = PL_top_env; \
while (p) { i++; p = p->je_prev; } \
Perl_deb(aTHX_ "JUMPENV_POP level=%d at %s:%d\n", \
i, __FILE__, __LINE__);}) \
assert(PL_top_env == &cur_env); \
PL_top_env = cur_env.je_prev; \
} STMT_END

#define JMPENV_JUMP(v) \
STMT_START { \
DEBUG_l({ \
int i = -1; JMPENV *p = PL_top_env; \
while (p) { i++; p = p->je_prev; } \
Perl_deb(aTHX_ "JUMPENV_JUMP(%d) level=%d at %s:%d\n", \
(int)v, i, __FILE__, __LINE__);}) \
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) \
STMT_START { \
DEBUG_l( \
Perl_deb(aTHX_ \
"JUMPLEVEL set catch %d => %d (for %p) at %s:%d\n", \
PL_top_env->je_mustcatch, v, (void*)PL_top_env, \
__FILE__, __LINE__);) \
PL_top_env->je_mustcatch = (v); \
} STMT_END


#include "mydtrace.h"

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 */
    /* label for this construct is now stored in cop_hints_hash */
#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))
# ifdef NETWARE
# define CopSTASH_free(c) SAVECOPSTASH_FREE(c)
# define CopFILE_free(c) SAVECOPFILE_FREE(c)
# else
# define CopSTASH_free(c) PerlMemShared_free(CopSTASHPV(c))
# define CopFILE_free(c) (PerlMemShared_free(CopFILE(c)),(CopFILE(c) = 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 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 CopSTASH_free(c)
# define CopFILE_free(c) (SvREFCNT_dec(CopFILEGV(c)),(CopFILEGV(c) = NULL))

#endif /* USE_ITHREADS */
#define CopLABEL(c) Perl_fetch_cop_label(aTHX_ (c)->cop_hints_hash, NULL, NULL)
#define CopLABEL_alloc(pv) ((pv)?savepv(pv):NULL)

#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.) */
#define OutCopFILE(c) CopFILE(c)

/* 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) { \
SV *val = newSViv(b); \
(void)hv_stores(GvHV(PL_hintgv), "$[", val); \
mg_set(val); \
PL_hints |= HINT_ARYBASE; \
} else { \
(c)->cop_hints_hash \
= Perl_refcounted_he_new(aTHX_ (c)->cop_hints_hash, \
newSVpvs_flags("$[", SVs_TEMP), \
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 {
    OP * retop; /* op to execute on exit from sub */
    /* Above here is the same for sub, format and eval. */
    CV * cv;
    /* Above here is the same for sub and format. */
    AV * savearray;
    AV * argarray;
    I32 olddepth;
    PAD *oldcomppad;
};


/* format context */
struct block_format {
    OP * retop; /* op to execute on exit from sub */
    /* Above here is the same for sub, format and eval. */
    CV * cv;
    /* Above here is the same for sub and format. */
    GV * gv;
    GV * dfoutgv;
};

/* 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) \
ENTRY_PROBE(GvENAME(CvGV(cv)), \
CopFILE((const COP *)CvSTART(cv)), \
CopLINE((const COP *)CvSTART(cv))); \
\
cx->blk_sub.cv = cv; \
cx->blk_sub.olddepth = CvDEPTH(cv); \
cx->cx_type |= (hasargs) ? CXp_HASARGS : 0; \
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_u16 = 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_u16 = 0;


#define PUSHFORMAT(cx, retop) \
cx->blk_format.cv = cv; \
cx->blk_format.gv = gv; \
cx->blk_format.retop = (retop); \
cx->blk_format.dfoutgv = PL_defoutgv; \
SvREFCNT_inc_void(cx->blk_format.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 { \
RETURN_PROBE(GvENAME(CvGV((const CV*)cx->blk_sub.cv)), \
CopFILE((COP*)CvSTART((const CV*)cx->blk_sub.cv)), \
CopLINE((COP*)CvSTART((const CV*)cx->blk_sub.cv))); \
\
if (CxHASARGS(cx)) { \
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) = MUTABLE_SV(cx->blk_sub.argarray); \
} \
else { \
CLEAR_ARGARRAY(cx->blk_sub.argarray); \
} \
} \
sv = MUTABLE_SV(cx->blk_sub.cv); \
if (sv && (CvDEPTH((const 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_format.dfoutgv); \
SvREFCNT_dec(cx->blk_format.dfoutgv);

/* eval context */
struct block_eval {
    OP * retop; /* op to execute on exit from eval */
    /* Above here is the same for sub, format and eval. */
    SV * old_namesv;
    OP * old_eval_root;
    SV * cur_text;
    CV * cv;
    JMPENV * cur_top_env; /* value of PL_top_env when eval CX created */
};

/* If we ever need more than 512 op types, change the shift from 7.
blku_gimme is actually also only 2 bits, so could be merged with something.
*/

#define CxOLD_IN_EVAL(cx) (((cx)->blk_u16) & 0x7F)
#define CxOLD_OP_TYPE(cx) (((cx)->blk_u16) >> 7)

#define PUSHEVAL(cx,n) \
STMT_START { \
assert(!(PL_in_eval & ~0x7F)); \
assert(!(PL_op->op_type & ~0x1FF)); \
cx->blk_u16 = (PL_in_eval & 0x7F) | ((U16)PL_op->op_type << 7); \
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 = CxOLD_IN_EVAL(cx); \
optype = CxOLD_OP_TYPE(cx); \
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 {
    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
    PAD *oldcomppad; /* Also used for the GV, if targoffset is 0 */
    /* This is also accesible via cx->blk_loop.my_op->op_targ */
    PADOFFSET targoffset;
#else
    OP * next_op;
    SV ** itervar;
#endif
    union {
struct { /* valid if type is LOOP_FOR or LOOP_PLAIN (but {NULL,0})*/
AV * ary; /* use the stack if this is NULL */
IV ix;
} ary;
struct { /* valid if type is LOOP_LAZYIV */
IV cur;
IV end;
} lazyiv;
struct { /* valid if type if LOOP_LAZYSV */
SV * cur;
SV * end; /* maxiumum value (or minimum in reverse) */
} lazysv;
    } state_u;
};

#ifdef USE_ITHREADS
# define CxITERVAR(c) \
((c)->blk_loop.oldcomppad \
? (CxPADLOOP(c) \
? &CX_CURPAD_SV( (c)->blk_loop, (c)->blk_loop.targoffset ) \
: &GvSV((GV*)(c)->blk_loop.oldcomppad)) \
: (SV**)NULL)
# define CX_ITERDATA_SET(cx,idata,o) \
if ((cx->blk_loop.targoffset = (o))) \
CX_CURPAD_SAVE(cx->blk_loop); \
else \
cx->blk_loop.oldcomppad = (idata);
#else
# define CxITERVAR(c) ((c)->blk_loop.itervar)
# define CX_ITERDATA_SET(cx,ivar,o) \
cx->blk_loop.itervar = (SV**)(ivar);
#endif
#define CxLABEL(c) (0 + CopLABEL((c)->blk_oldcop))
#define CxHASARGS(c) (((c)->cx_type & CXp_HASARGS) == CXp_HASARGS)
#define CxLVAL(c) (0 + (c)->blk_u16)

#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_PLAIN(cx, s) \
cx->blk_loop.resetsp = s - PL_stack_base; \
cx->blk_loop.my_op = cLOOP; \
PUSHLOOP_OP_NEXT; \
cx->blk_loop.state_u.ary.ary = NULL; \
cx->blk_loop.state_u.ary.ix = 0; \
CX_ITERDATA_SET(cx, NULL, 0);

#define PUSHLOOP_FOR(cx, dat, s, offset) \
cx->blk_loop.resetsp = s - PL_stack_base; \
cx->blk_loop.my_op = cLOOP; \
PUSHLOOP_OP_NEXT; \
cx->blk_loop.state_u.ary.ary = NULL; \
cx->blk_loop.state_u.ary.ix = 0; \
CX_ITERDATA_SET(cx, dat, offset);

#define POPLOOP(cx) \
if (CxTYPE(cx) == CXt_LOOP_LAZYSV) { \
SvREFCNT_dec(cx->blk_loop.state_u.lazysv.cur); \
SvREFCNT_dec(cx->blk_loop.state_u.lazysv.end); \
} \
if (CxTYPE(cx) == CXt_LOOP_FOR) \
SvREFCNT_dec(cx->blk_loop.state_u.ary.ary);

/* 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 {
    U8 blku_type; /* what kind of context this is */
    U8 blku_gimme; /* is this block running in list context? */
    U16 blku_u16; /* used by block_sub and block_eval (so far) */
    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_format blku_format;
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_u16 cx_u.cx_blk.blku_u16
#define blk_sub cx_u.cx_blk.blk_u.blku_sub
#define blk_format cx_u.cx_blk.blk_u.blku_format
#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

#define DEBUG_CX(action) \
DEBUG_l(WITH_THX( \
Perl_deb(aTHX_ "CX %ld %s %s (scope %ld,%ld) at %s:%d\n", \
(long)cxstack_ix, \
action, \
PL_block_type[CxTYPE(&cxstack[cxstack_ix])], \
(long)PL_scopestack_ix, \
(long)(cxstack[cxstack_ix].blk_oldscopesp), \
__FILE__, __LINE__)));

/* 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_CX("PUSH");

/* Exit a block (RETURN and LAST). */
#define POPBLOCK(cx,pm) \
DEBUG_CX("POP"); \
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;

/* Continue a block elsewhere (NEXT and REDO). */
#define TOPBLOCK(cx) \
DEBUG_CX("TOP"); \
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;

/* substitution context */
struct subst {
    U8 sbu_type; /* what kind of context this is */
    U8 sbu_rflags;
    U16 sbu_rxtainted; /* matches struct block */
    I32 sbu_iters;
    I32 sbu_maxiters;
    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

#ifdef PERL_CORE
# 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_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 | (once ? CXp_ONCE : 0); \
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)
#endif

#define CxONCE(cx) ((cx)->cx_type & CXp_ONCE)

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

/* If you re-order these, there is also an array of uppercase names in perl.h
and a static array of context names in pp_ctl.c */
#define CXTYPEMASK 0xf
#define CXt_NULL 0
#define CXt_WHEN 1
#define CXt_BLOCK 2
/* When micro-optimising :-) keep GIVEN next to the LOOPs, as these 5 share a
jump table in pp_ctl.c
The first 4 don't have a 'case' in at least one switch statement in pp_ctl.c
*/
#define CXt_GIVEN 3
/* This is first so that CXt_LOOP_FOR|CXt_LOOP_LAZYIV is CXt_LOOP_LAZYIV */
#define CXt_LOOP_FOR 4
#define CXt_LOOP_PLAIN 5
#define CXt_LOOP_LAZYSV 6
#define CXt_LOOP_LAZYIV 7
#define CXt_SUB 8
#define CXt_FORMAT 9
#define CXt_EVAL 10
#define CXt_SUBST 11
/* SUBST doesn't feature in all switch statements. */

/* private flags for CXt_SUB and CXt_NULL
However, this is checked in many places which do not check the type, so
this bit needs to be kept clear for most everything else. For reasons I
haven't investigated, it can coexist with CXp_FOR_DEF */
#define CXp_MULTICALL 0x10 /* part of a multicall (so don't
tear down context on exit). */

/* private flags for CXt_SUB and CXt_FORMAT */
#define CXp_HASARGS 0x20

/* private flags for CXt_EVAL */
#define CXp_REAL 0x20 /* truly eval'', not a lookalike */
#define CXp_TRYBLOCK 0x40 /* eval{}, not eval'' or similar */

/* private flags for CXt_LOOP */
#define CXp_FOR_DEF 0x10 /* foreach using $_ */
#ifdef USE_ITHREADS
# define CxPADLOOP(c) ((c)->blk_loop.targoffset)
#endif

/* private flags for CXt_SUBST */
#define CXp_ONCE 0x10 /* What was sbu_once in struct subst */

#define CxTYPE(c) ((c)->cx_type & CXTYPEMASK)
#define CxTYPE_is_LOOP(c) (((c)->cx_type & 0xC) == 0x4)
#define CxMULTICALL(c) (((c)->cx_type & CXp_MULTICALL) \
== CXp_MULTICALL)
#define CxREALEVAL(c) (((c)->cx_type & (CXTYPEMASK|CXp_REAL)) \
== (CXt_EVAL|CXp_REAL))
#define CxTRYBLOCK(c) (((c)->cx_type & (CXTYPEMASK|CXp_TRYBLOCK)) \
== (CXt_EVAL|CXp_TRYBLOCK))
#define CxFOREACH(c) (CxTYPE_is_LOOP(c) && CxTYPE(c) != CXt_LOOP_PLAIN)
#define CxFOREACHDEF(c) ((CxTYPE_is_LOOP(c) && CxTYPE(c) != CXt_LOOP_PLAIN) \
&& ((c)->cx_type & 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 2
#define G_ARRAY 3
#define G_VOID 1
#define G_WANT 3

/* extra flags for Perl_call_* routines */
#define G_DISCARD 4 /* Call FREETMPS.
Don't change this without consulting the
hash actions codes defined in hv.h */
#define G_EVAL 8 /* Assume eval {} around subroutine call. */
#define G_NOARGS 16 /* Don't construct a @_ array. */
#define G_KEEPERR 32 /* Warn for errors, don't overwrite $@ */
#define G_NODEBUG 64 /* Disable debugging at toplevel. */
#define G_METHOD 128 /* Calling method. */
#define G_FAKINGEVAL 256 /* Faking an eval context for call_sv or
fold_constants. */
#define G_UNDEF_FILL 512 /* Fill the stack with &PL_sv_undef
A special case for UNSHIFT in
Perl_magic_methcall(). */

/* 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; \
DEBUG_l({ \
int i = 0; PERL_SI *p = PL_curstackinfo; \
while (p) { i++; p = p->si_prev; } \
Perl_deb(aTHX_ "push STACKINFO %d at %s:%d\n", \
i, __FILE__, __LINE__);}) \
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; \
DEBUG_l({ \
int i = -1; PERL_SI *p = PL_curstackinfo; \
while (p) { i++; p = p->si_prev; } \
Perl_deb(aTHX_ "pop STACKINFO %d at %s:%d\n", \
i, __FILE__, __LINE__);}) \
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); \
PUSHSTACKi(PERLSI_SORT); \
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); \
POPSTACK; \
CATCH_SET(multicall_oldcatch); \
LEAVE; \
SPAGAIN; \
} 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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