[perl5.git] / cop.h

/*    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 = 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(defgv));					\
	GvAV(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 = in_eval;				\
	cx->blk_eval.old_op_type = op->op_type;				\
	cx->blk_eval.old_name = n;					\
	cx->blk_eval.old_eval_root = eval_root;				\
	cx->blk_eval.cur_text = linestr;

#define POPEVAL(cx)							\
	in_eval = cx->blk_eval.old_in_eval;				\
	optype = cx->blk_eval.old_op_type;				\
	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;
    I32		iterix;
};

#define PUSHLOOP(cx, ivar, s)						\
	cx->blk_loop.label = curcop->cop_label;				\
	cx->blk_loop.resetsp = s - 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 = 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 != 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 - stack_base,			\
	cx->blk_oldcop		= curcop,				\
	cx->blk_oldmarksp	= markstack_ptr - markstack,		\
	cx->blk_oldscopesp	= scopestack_ix,			\
	cx->blk_oldretsp	= retstack_ix,				\
	cx->blk_oldpm		= 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		= stack_base + cx->blk_oldsp,			\
	curcop		= cx->blk_oldcop,				\
	markstack_ptr	= markstack + cx->blk_oldmarksp,		\
	scopestack_ix	= cx->blk_oldscopesp,				\
	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],				\
	stack_sp	= stack_base + cx->blk_oldsp,			\
	markstack_ptr	= markstack + cx->blk_oldmarksp,		\
	scopestack_ix	= cx->blk_oldscopesp,				\
	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 */
Commit	Line	Data
a0d0e21e	1	/* cop.h
79072805	2	*
9607fc9c	3	* Copyright (c) 1991-1997, Larry Wall
79072805 LW	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	*
79072805 LW	8	*/
79072805 LW	9
79072805 LW	10	struct cop {
79072805 LW	11	BASEOP
a0d0e21e	12	char * cop_label; /* label for this construct */
79072805 LW	13	HV * cop_stash; /* package line was compiled in */
79072805 LW	14	GV * cop_filegv; /* file the following line # is from */
a0d0e21e LW	15	U32 cop_seq; /* parse sequence number */
a0d0e21e LW	16	I32 cop_arybase; /* array base this line was compiled with */
79072805	17	line_t cop_line; /* line # of this command */
79072805 LW	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;
463ee0b2	30	GV * dfoutgv;
6d4ff0d2	31	#ifndef USE_THREADS
79072805	32	AV * savearray;
6d4ff0d2	33	#endif /* USE_THREADS */
79072805 LW	34	AV * argarray;
	35	U16 olddepth;
	36	U8 hasargs;
	37	};
	38
	39	#define PUSHSUB(cx) \
	40	cx->blk_sub.cv = cv; \
79072805 LW	41	cx->blk_sub.olddepth = CvDEPTH(cv); \
	42	cx->blk_sub.hasargs = hasargs;
	43
	44	#define PUSHFORMAT(cx) \
	45	cx->blk_sub.cv = cv; \
	46	cx->blk_sub.gv = gv; \
4633a7c4	47	cx->blk_sub.hasargs = 0; \
463ee0b2	48	cx->blk_sub.dfoutgv = defoutgv; \
4633a7c4	49	(void)SvREFCNT_inc(cx->blk_sub.dfoutgv)
79072805 LW	50
79072805 LW	51	#define POPSUB(cx) \
f86702cc	52	{ struct block_sub cxsub; \
	53	POPSUB1(cx); \
	54	POPSUB2(); }
	55
	56	#define POPSUB1(cx) \
	57	cxsub = cx->blk_sub; /* because DESTROY may clobber cx /
	58
6d4ff0d2 MB	59	#ifdef USE_THREADS
	60	#define POPSAVEARRAY() NOOP
	61	#else
	62	#define POPSAVEARRAY() \
	63	STMT_START { \
	64	SvREFCNT_dec(GvAV(defgv)); \
	65	GvAV(defgv) = cxsub.savearray; \
	66	} STMT_END
	67	#endif /* USE_THREADS */
	68
f86702cc	69	#define POPSUB2() \
f86702cc	70	if (cxsub.hasargs) { \
6d4ff0d2	71	POPSAVEARRAY(); \
774d564b	72	/* destroy arg array */ \
f86702cc	73	av_clear(cxsub.argarray); \
f86702cc	74	AvREAL_off(cxsub.argarray); \
79072805	75	} \
f86702cc	76	if (cxsub.cv) { \
	77	if (!(CvDEPTH(cxsub.cv) = cxsub.olddepth)) \
	78	SvREFCNT_dec(cxsub.cv); \
79072805 LW	79	}
	80
	81	#define POPFORMAT(cx) \
4633a7c4 LW	82	setdefout(cx->blk_sub.dfoutgv); \
4633a7c4 LW	83	SvREFCNT_dec(cx->blk_sub.dfoutgv);
79072805 LW	84
	85	/* eval context */
	86	struct block_eval {
	87	I32 old_in_eval;
	88	I32 old_op_type;
	89	char * old_name;
	90	OP * old_eval_root;
748a9306	91	SV * cur_text;
79072805 LW	92	};
79072805 LW	93
8990e307	94	#define PUSHEVAL(cx,n,fgv) \
79072805 LW	95	cx->blk_eval.old_in_eval = in_eval; \
	96	cx->blk_eval.old_op_type = op->op_type; \
	97	cx->blk_eval.old_name = n; \
748a9306 LW	98	cx->blk_eval.old_eval_root = eval_root; \
748a9306 LW	99	cx->blk_eval.cur_text = linestr;
79072805 LW	100
	101	#define POPEVAL(cx) \
	102	in_eval = cx->blk_eval.old_in_eval; \
	103	optype = cx->blk_eval.old_op_type; \
	104	eval_root = cx->blk_eval.old_eval_root;
	105
	106	/* loop context */
	107	struct block_loop {
	108	char * label;
	109	I32 resetsp;
	110	OP * redo_op;
	111	OP * next_op;
	112	OP * last_op;
	113	SV ** itervar;
	114	SV * itersave;
5f05dabc	115	SV * iterlval;
79072805 LW	116	AV * iterary;
	117	I32 iterix;
	118	};
	119
	120	#define PUSHLOOP(cx, ivar, s) \
	121	cx->blk_loop.label = curcop->cop_label; \
	122	cx->blk_loop.resetsp = s - stack_base; \
	123	cx->blk_loop.redo_op = cLOOP->op_redoop; \
	124	cx->blk_loop.next_op = cLOOP->op_nextop; \
	125	cx->blk_loop.last_op = cLOOP->op_lastop; \
7a4c00b4	126	if (cx->blk_loop.itervar = (ivar)) \
44a8e56a	127	cx->blk_loop.itersave = SvREFCNT_inc(*cx->blk_loop.itervar);\
	128	cx->blk_loop.iterlval = Nullsv; \
	129	cx->blk_loop.iterary = Nullav; \
	130	cx->blk_loop.iterix = -1;
79072805 LW	131
79072805 LW	132	#define POPLOOP(cx) \
f86702cc	133	{ struct block_loop cxloop; \
	134	POPLOOP1(cx); \
	135	POPLOOP2(); }
	136
	137	#define POPLOOP1(cx) \
4fdae800	138	cxloop = cx->blk_loop; /* because DESTROY may clobber cx / \
4fdae800	139	newsp = stack_base + cxloop.resetsp;
f86702cc	140
f86702cc	141	#define POPLOOP2() \
f86702cc	142	SvREFCNT_dec(cxloop.iterlval); \
	143	if (cxloop.itervar) { \
	144	SvREFCNT_dec(*cxloop.itervar); \
	145	*cxloop.itervar = cxloop.itersave; \
44a8e56a	146	} \
f86702cc	147	if (cxloop.iterary && cxloop.iterary != curstack) \
f86702cc	148	SvREFCNT_dec(cxloop.iterary);
79072805 LW	149
	150	/* context common to subroutines, evals and loops */
	151	struct block {
	152	I32 blku_oldsp; /* stack pointer to copy stuff down to */
	153	COP * blku_oldcop; /* old curcop pointer */
	154	I32 blku_oldretsp; /* return stack index */
	155	I32 blku_oldmarksp; /* mark stack index */
	156	I32 blku_oldscopesp; /* scope stack index */
	157	PMOP * blku_oldpm; /* values of pattern match vars */
	158	U8 blku_gimme; /* is this block running in list context? */
	159
	160	union {
	161	struct block_sub blku_sub;
	162	struct block_eval blku_eval;
	163	struct block_loop blku_loop;
	164	} blk_u;
	165	};
	166	#define blk_oldsp cx_u.cx_blk.blku_oldsp
	167	#define blk_oldcop cx_u.cx_blk.blku_oldcop
	168	#define blk_oldretsp cx_u.cx_blk.blku_oldretsp
	169	#define blk_oldmarksp cx_u.cx_blk.blku_oldmarksp
	170	#define blk_oldscopesp cx_u.cx_blk.blku_oldscopesp
	171	#define blk_oldpm cx_u.cx_blk.blku_oldpm
	172	#define blk_gimme cx_u.cx_blk.blku_gimme
	173	#define blk_sub cx_u.cx_blk.blk_u.blku_sub
	174	#define blk_eval cx_u.cx_blk.blk_u.blku_eval
	175	#define blk_loop cx_u.cx_blk.blk_u.blku_loop
	176
	177	/* Enter a block. */
8990e307	178	#define PUSHBLOCK(cx,t,sp) CXINC, cx = &cxstack[cxstack_ix], \
79072805	179	cx->cx_type = t, \
8990e307	180	cx->blk_oldsp = sp - stack_base, \
79072805 LW	181	cx->blk_oldcop = curcop, \
	182	cx->blk_oldmarksp = markstack_ptr - markstack, \
	183	cx->blk_oldscopesp = scopestack_ix, \
	184	cx->blk_oldretsp = retstack_ix, \
	185	cx->blk_oldpm = curpm, \
	186	cx->blk_gimme = gimme; \
760ac839	187	DEBUG_l( PerlIO_printf(PerlIO_stderr(), "Entering block %ld, type %s\n", \
a0d0e21e	188	(long)cxstack_ix, block_type[t]); )
79072805 LW	189
79072805 LW	190	/* Exit a block (RETURN and LAST). */
a0d0e21e	191	#define POPBLOCK(cx,pm) cx = &cxstack[cxstack_ix--], \
79072805 LW	192	newsp = stack_base + cx->blk_oldsp, \
	193	curcop = cx->blk_oldcop, \
	194	markstack_ptr = markstack + cx->blk_oldmarksp, \
	195	scopestack_ix = cx->blk_oldscopesp, \
	196	retstack_ix = cx->blk_oldretsp, \
a0d0e21e	197	pm = cx->blk_oldpm, \
79072805	198	gimme = cx->blk_gimme; \
760ac839	199	DEBUG_l( PerlIO_printf(PerlIO_stderr(), "Leaving block %ld, type %s\n", \
a0d0e21e	200	(long)cxstack_ix+1,block_type[cx->cx_type]); )
79072805 LW	201
	202	/* Continue a block elsewhere (NEXT and REDO). */
	203	#define TOPBLOCK(cx) cx = &cxstack[cxstack_ix], \
	204	stack_sp = stack_base + cx->blk_oldsp, \
	205	markstack_ptr = markstack + cx->blk_oldmarksp, \
	206	scopestack_ix = cx->blk_oldscopesp, \
	207	retstack_ix = cx->blk_oldretsp
	208
	209	/* substitution context */
	210	struct subst {
	211	I32 sbu_iters;
	212	I32 sbu_maxiters;
	213	I32 sbu_safebase;
4633a7c4	214	I32 sbu_oldsave;
71be2cbc	215	bool sbu_once;
71be2cbc	216	bool sbu_rxtainted;
79072805 LW	217	char * sbu_orig;
	218	SV * sbu_dstr;
	219	SV * sbu_targ;
	220	char * sbu_s;
	221	char * sbu_m;
	222	char * sbu_strend;
c90c0ff4	223	void * sbu_rxres;
c07a80fd	224	REGEXP * sbu_rx;
79072805 LW	225	};
	226	#define sb_iters cx_u.cx_subst.sbu_iters
	227	#define sb_maxiters cx_u.cx_subst.sbu_maxiters
	228	#define sb_safebase cx_u.cx_subst.sbu_safebase
4633a7c4	229	#define sb_oldsave cx_u.cx_subst.sbu_oldsave
71be2cbc	230	#define sb_once cx_u.cx_subst.sbu_once
71be2cbc	231	#define sb_rxtainted cx_u.cx_subst.sbu_rxtainted
79072805 LW	232	#define sb_orig cx_u.cx_subst.sbu_orig
	233	#define sb_dstr cx_u.cx_subst.sbu_dstr
	234	#define sb_targ cx_u.cx_subst.sbu_targ
	235	#define sb_s cx_u.cx_subst.sbu_s
	236	#define sb_m cx_u.cx_subst.sbu_m
	237	#define sb_strend cx_u.cx_subst.sbu_strend
c90c0ff4	238	#define sb_rxres cx_u.cx_subst.sbu_rxres
c07a80fd	239	#define sb_rx cx_u.cx_subst.sbu_rx
79072805 LW	240
	241	#define PUSHSUBST(cx) CXINC, cx = &cxstack[cxstack_ix], \
	242	cx->sb_iters = iters, \
	243	cx->sb_maxiters = maxiters, \
	244	cx->sb_safebase = safebase, \
4633a7c4	245	cx->sb_oldsave = oldsave, \
71be2cbc	246	cx->sb_once = once, \
71be2cbc	247	cx->sb_rxtainted = rxtainted, \
79072805 LW	248	cx->sb_orig = orig, \
	249	cx->sb_dstr = dstr, \
	250	cx->sb_targ = targ, \
	251	cx->sb_s = s, \
	252	cx->sb_m = m, \
	253	cx->sb_strend = strend, \
c90c0ff4	254	cx->sb_rxres = Null(void*), \
c07a80fd	255	cx->sb_rx = rx, \
c90c0ff4	256	cx->cx_type = CXt_SUBST; \
c90c0ff4	257	rxres_save(&cx->sb_rxres, rx)
79072805	258
c90c0ff4	259	#define POPSUBST(cx) cx = &cxstack[cxstack_ix--]; \
c90c0ff4	260	rxres_free(&cx->sb_rxres)
79072805 LW	261
	262	struct context {
	263	I32 cx_type; /* what kind of context this is */
	264	union {
	265	struct block cx_blk;
	266	struct subst cx_subst;
	267	} cx_u;
	268	};
	269	#define CXt_NULL 0
	270	#define CXt_SUB 1
	271	#define CXt_EVAL 2
	272	#define CXt_LOOP 3
	273	#define CXt_SUBST 4
	274	#define CXt_BLOCK 5
	275
	276	#define CXINC (cxstack_ix < cxstack_max ? ++cxstack_ix : (cxstack_ix = cxinc()))
	277
	278	/* "gimme" values */
a0d0e21e LW	279	#define G_SCALAR 0
a0d0e21e LW	280	#define G_ARRAY 1
54310121	281	#define G_VOID 128 /* skip this bit when adding flags below */
79072805	282
a0d0e21e LW	283	/* extra flags for perl_call_* routines */
	284	#define G_DISCARD 2 /* Call FREETMPS. */
	285	#define G_EVAL 4 /* Assume eval {} around subroutine call. */
	286	#define G_NOARGS 8 /* Don't construct a @_ array. */
54310121	287	#define G_KEEPERR 16 /* Append errors to $@, don't overwrite it */