[p5sagit/p5-mst-13.2.git] / cop.h

/*    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 */
    SV *	cop_warnings;	/* lexical warnings bitmask */
};

#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;
    U8		lval;		/* XXX merge lval and hasargs? */
};

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

#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);					\
	    AvREIFY_on(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, 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,				\
	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,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_retstack_ix	 = cx->blk_oldretsp,				\
	PL_curpm         = cx->blk_oldpm

/* substitution context */
struct subst {
    I32		sbu_iters;
    I32		sbu_maxiters;
    I32		sbu_rflags;
    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_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(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.  */
#define G_NOCATCH      64       /* Don't do CATCH_SET() */

/* 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 */

/* 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)

/* 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 {							\
	djSP;								\
	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
Commit	Line	Data
a0d0e21e	1	/* cop.h
79072805	2	*
4eb8286e	3	* Copyright (c) 1991-1999, Larry Wall
79072805	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	8	*/
79072805	9
79072805	10	struct cop {
79072805	11	BASEOP
a0d0e21e	12	char * cop_label; /* label for this construct */
79072805	13	HV * cop_stash; /* package line was compiled in */
79072805	14	GV * cop_filegv; /* file the following line # is from */
a0d0e21e	15	U32 cop_seq; /* parse sequence number */
a0d0e21e	16	I32 cop_arybase; /* array base this line was compiled with */
79072805	17	line_t cop_line; /* line # of this command */
599cee73	18	SV * cop_warnings; /* lexical warnings bitmask */
79072805	19	};
	20
	21	#define Nullcop Null(COP*)
	22
	23	/*
	24	* Here we have some enormously heavy (or at least ponderous) wizardry.
	25	*/
	26
	27	/* subroutine context */
	28	struct block_sub {
	29	CV * cv;
	30	GV * gv;
463ee0b2	31	GV * dfoutgv;
6d4ff0d2	32	#ifndef USE_THREADS
79072805	33	AV * savearray;
6d4ff0d2	34	#endif /* USE_THREADS */
79072805	35	AV * argarray;
	36	U16 olddepth;
	37	U8 hasargs;
cd06dffe	38	U8 lval; /* XXX merge lval and hasargs? */
79072805	39	};
	40
	41	#define PUSHSUB(cx) \
	42	cx->blk_sub.cv = cv; \
79072805	43	cx->blk_sub.olddepth = CvDEPTH(cv); \
cd06dffe	44	cx->blk_sub.hasargs = hasargs; \
	45	cx->blk_sub.lval = PL_op->op_private & \
	46	(OPpLVAL_INTRO\|OPpENTERSUB_INARGS);
79072805	47
	48	#define PUSHFORMAT(cx) \
	49	cx->blk_sub.cv = cv; \
	50	cx->blk_sub.gv = gv; \
4633a7c4	51	cx->blk_sub.hasargs = 0; \
3280af22	52	cx->blk_sub.dfoutgv = PL_defoutgv; \
4633a7c4	53	(void)SvREFCNT_inc(cx->blk_sub.dfoutgv)
79072805	54
79072805	55	#define POPSUB(cx) \
f86702cc	56	{ struct block_sub cxsub; \
	57	POPSUB1(cx); \
	58	POPSUB2(); }
	59
	60	#define POPSUB1(cx) \
	61	cxsub = cx->blk_sub; /* because DESTROY may clobber cx /
	62
6d4ff0d2	63	#ifdef USE_THREADS
	64	#define POPSAVEARRAY() NOOP
	65	#else
	66	#define POPSAVEARRAY() \
	67	STMT_START { \
3280af22	68	SvREFCNT_dec(GvAV(PL_defgv)); \
3280af22	69	GvAV(PL_defgv) = cxsub.savearray; \
6d4ff0d2	70	} STMT_END
	71	#endif /* USE_THREADS */
	72
f86702cc	73	#define POPSUB2() \
f86702cc	74	if (cxsub.hasargs) { \
6d4ff0d2	75	POPSAVEARRAY(); \
774d564b	76	/* destroy arg array */ \
f86702cc	77	av_clear(cxsub.argarray); \
f86702cc	78	AvREAL_off(cxsub.argarray); \
64de36e6	79	AvREIFY_on(cxsub.argarray); \
79072805	80	} \
f86702cc	81	if (cxsub.cv) { \
	82	if (!(CvDEPTH(cxsub.cv) = cxsub.olddepth)) \
	83	SvREFCNT_dec(cxsub.cv); \
79072805	84	}
	85
	86	#define POPFORMAT(cx) \
4633a7c4	87	setdefout(cx->blk_sub.dfoutgv); \
4633a7c4	88	SvREFCNT_dec(cx->blk_sub.dfoutgv);
79072805	89
	90	/* eval context */
	91	struct block_eval {
	92	I32 old_in_eval;
	93	I32 old_op_type;
	94	char * old_name;
	95	OP * old_eval_root;
748a9306	96	SV * cur_text;
79072805	97	};
79072805	98
8990e307	99	#define PUSHEVAL(cx,n,fgv) \
3280af22	100	cx->blk_eval.old_in_eval = PL_in_eval; \
533c011a	101	cx->blk_eval.old_op_type = PL_op->op_type; \
79072805	102	cx->blk_eval.old_name = n; \
3280af22	103	cx->blk_eval.old_eval_root = PL_eval_root; \
3280af22	104	cx->blk_eval.cur_text = PL_linestr;
79072805	105
79072805	106	#define POPEVAL(cx) \
3280af22	107	PL_in_eval = cx->blk_eval.old_in_eval; \
79072805	108	optype = cx->blk_eval.old_op_type; \
3280af22	109	PL_eval_root = cx->blk_eval.old_eval_root;
79072805	110
	111	/* loop context */
	112	struct block_loop {
	113	char * label;
	114	I32 resetsp;
	115	OP * redo_op;
	116	OP * next_op;
	117	OP * last_op;
	118	SV ** itervar;
	119	SV * itersave;
5f05dabc	120	SV * iterlval;
79072805	121	AV * iterary;
89ea2908	122	IV iterix;
89ea2908	123	IV itermax;
79072805	124	};
	125
	126	#define PUSHLOOP(cx, ivar, s) \
3280af22	127	cx->blk_loop.label = PL_curcop->cop_label; \
3280af22	128	cx->blk_loop.resetsp = s - PL_stack_base; \
79072805	129	cx->blk_loop.redo_op = cLOOP->op_redoop; \
	130	cx->blk_loop.next_op = cLOOP->op_nextop; \
	131	cx->blk_loop.last_op = cLOOP->op_lastop; \
7a4c00b4	132	if (cx->blk_loop.itervar = (ivar)) \
44a8e56a	133	cx->blk_loop.itersave = SvREFCNT_inc(*cx->blk_loop.itervar);\
	134	cx->blk_loop.iterlval = Nullsv; \
	135	cx->blk_loop.iterary = Nullav; \
	136	cx->blk_loop.iterix = -1;
79072805	137
79072805	138	#define POPLOOP(cx) \
f86702cc	139	{ struct block_loop cxloop; \
	140	POPLOOP1(cx); \
	141	POPLOOP2(); }
	142
	143	#define POPLOOP1(cx) \
4fdae800	144	cxloop = cx->blk_loop; /* because DESTROY may clobber cx / \
3280af22	145	newsp = PL_stack_base + cxloop.resetsp;
f86702cc	146
f86702cc	147	#define POPLOOP2() \
f86702cc	148	SvREFCNT_dec(cxloop.iterlval); \
f86702cc	149	if (cxloop.itervar) { \
8bb77e1d	150	sv_2mortal(*cxloop.itervar); \
f86702cc	151	*cxloop.itervar = cxloop.itersave; \
44a8e56a	152	} \
3280af22	153	if (cxloop.iterary && cxloop.iterary != PL_curstack) \
f86702cc	154	SvREFCNT_dec(cxloop.iterary);
79072805	155
	156	/* context common to subroutines, evals and loops */
	157	struct block {
	158	I32 blku_oldsp; /* stack pointer to copy stuff down to */
	159	COP * blku_oldcop; /* old curcop pointer */
	160	I32 blku_oldretsp; /* return stack index */
	161	I32 blku_oldmarksp; /* mark stack index */
	162	I32 blku_oldscopesp; /* scope stack index */
	163	PMOP * blku_oldpm; /* values of pattern match vars */
	164	U8 blku_gimme; /* is this block running in list context? */
	165
	166	union {
	167	struct block_sub blku_sub;
	168	struct block_eval blku_eval;
	169	struct block_loop blku_loop;
	170	} blk_u;
	171	};
	172	#define blk_oldsp cx_u.cx_blk.blku_oldsp
	173	#define blk_oldcop cx_u.cx_blk.blku_oldcop
	174	#define blk_oldretsp cx_u.cx_blk.blku_oldretsp
	175	#define blk_oldmarksp cx_u.cx_blk.blku_oldmarksp
	176	#define blk_oldscopesp cx_u.cx_blk.blku_oldscopesp
	177	#define blk_oldpm cx_u.cx_blk.blku_oldpm
	178	#define blk_gimme cx_u.cx_blk.blku_gimme
	179	#define blk_sub cx_u.cx_blk.blk_u.blku_sub
	180	#define blk_eval cx_u.cx_blk.blk_u.blku_eval
	181	#define blk_loop cx_u.cx_blk.blk_u.blku_loop
	182
	183	/* Enter a block. */
8990e307	184	#define PUSHBLOCK(cx,t,sp) CXINC, cx = &cxstack[cxstack_ix], \
79072805	185	cx->cx_type = t, \
3280af22	186	cx->blk_oldsp = sp - PL_stack_base, \
3280af22	187	cx->blk_oldcop = PL_curcop, \
1aff0e91	188	cx->blk_oldmarksp = PL_markstack_ptr - PL_markstack, \
3280af22	189	cx->blk_oldscopesp = PL_scopestack_ix, \
1aff0e91	190	cx->blk_oldretsp = PL_retstack_ix, \
3280af22	191	cx->blk_oldpm = PL_curpm, \
79072805	192	cx->blk_gimme = gimme; \
760ac839	193	DEBUG_l( PerlIO_printf(PerlIO_stderr(), "Entering block %ld, type %s\n", \
1aff0e91	194	(long)cxstack_ix, PL_block_type[CxTYPE(cx)]); )
79072805	195
79072805	196	/* Exit a block (RETURN and LAST). */
a0d0e21e	197	#define POPBLOCK(cx,pm) cx = &cxstack[cxstack_ix--], \
1aff0e91	198	newsp = PL_stack_base + cx->blk_oldsp, \
3280af22	199	PL_curcop = cx->blk_oldcop, \
	200	PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp, \
	201	PL_scopestack_ix = cx->blk_oldscopesp, \
	202	PL_retstack_ix = cx->blk_oldretsp, \
	203	pm = cx->blk_oldpm, \
	204	gimme = cx->blk_gimme; \
760ac839	205	DEBUG_l( PerlIO_printf(PerlIO_stderr(), "Leaving block %ld, type %s\n", \
22c35a8c	206	(long)cxstack_ix+1,PL_block_type[CxTYPE(cx)]); )
79072805	207
79072805	208	/* Continue a block elsewhere (NEXT and REDO). */
3280af22	209	#define TOPBLOCK(cx) cx = &cxstack[cxstack_ix], \
1aff0e91	210	PL_stack_sp = PL_stack_base + cx->blk_oldsp, \
3280af22	211	PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp, \
3280af22	212	PL_scopestack_ix = cx->blk_oldscopesp, \
2158dd9b	213	PL_retstack_ix = cx->blk_oldretsp, \
2158dd9b	214	PL_curpm = cx->blk_oldpm
79072805	215
	216	/* substitution context */
	217	struct subst {
	218	I32 sbu_iters;
	219	I32 sbu_maxiters;
22e551b9	220	I32 sbu_rflags;
4633a7c4	221	I32 sbu_oldsave;
71be2cbc	222	bool sbu_once;
71be2cbc	223	bool sbu_rxtainted;
79072805	224	char * sbu_orig;
	225	SV * sbu_dstr;
	226	SV * sbu_targ;
	227	char * sbu_s;
	228	char * sbu_m;
	229	char * sbu_strend;
c90c0ff4	230	void * sbu_rxres;
c07a80fd	231	REGEXP * sbu_rx;
79072805	232	};
	233	#define sb_iters cx_u.cx_subst.sbu_iters
	234	#define sb_maxiters cx_u.cx_subst.sbu_maxiters
22e551b9	235	#define sb_rflags cx_u.cx_subst.sbu_rflags
4633a7c4	236	#define sb_oldsave cx_u.cx_subst.sbu_oldsave
71be2cbc	237	#define sb_once cx_u.cx_subst.sbu_once
71be2cbc	238	#define sb_rxtainted cx_u.cx_subst.sbu_rxtainted
79072805	239	#define sb_orig cx_u.cx_subst.sbu_orig
	240	#define sb_dstr cx_u.cx_subst.sbu_dstr
	241	#define sb_targ cx_u.cx_subst.sbu_targ
	242	#define sb_s cx_u.cx_subst.sbu_s
	243	#define sb_m cx_u.cx_subst.sbu_m
	244	#define sb_strend cx_u.cx_subst.sbu_strend
c90c0ff4	245	#define sb_rxres cx_u.cx_subst.sbu_rxres
c07a80fd	246	#define sb_rx cx_u.cx_subst.sbu_rx
79072805	247
	248	#define PUSHSUBST(cx) CXINC, cx = &cxstack[cxstack_ix], \
	249	cx->sb_iters = iters, \
	250	cx->sb_maxiters = maxiters, \
22e551b9	251	cx->sb_rflags = r_flags, \
4633a7c4	252	cx->sb_oldsave = oldsave, \
71be2cbc	253	cx->sb_once = once, \
71be2cbc	254	cx->sb_rxtainted = rxtainted, \
79072805	255	cx->sb_orig = orig, \
	256	cx->sb_dstr = dstr, \
	257	cx->sb_targ = targ, \
	258	cx->sb_s = s, \
	259	cx->sb_m = m, \
	260	cx->sb_strend = strend, \
c90c0ff4	261	cx->sb_rxres = Null(void*), \
c07a80fd	262	cx->sb_rx = rx, \
c90c0ff4	263	cx->cx_type = CXt_SUBST; \
c90c0ff4	264	rxres_save(&cx->sb_rxres, rx)
79072805	265
c90c0ff4	266	#define POPSUBST(cx) cx = &cxstack[cxstack_ix--]; \
c90c0ff4	267	rxres_free(&cx->sb_rxres)
79072805	268
79072805	269	struct context {
6b35e009	270	U32 cx_type; /* what kind of context this is */
79072805	271	union {
	272	struct block cx_blk;
	273	struct subst cx_subst;
	274	} cx_u;
	275	};
6b35e009	276
6b35e009	277	#define CXTYPEMASK 0xff
79072805	278	#define CXt_NULL 0
	279	#define CXt_SUB 1
	280	#define CXt_EVAL 2
	281	#define CXt_LOOP 3
	282	#define CXt_SUBST 4
	283	#define CXt_BLOCK 5
	284
6b35e009	285	/* private flags for CXt_EVAL */
	286	#define CXp_REAL 0x00000100 /* truly eval'', not a lookalike */
	287
	288	#define CxTYPE(c) ((c)->cx_type & CXTYPEMASK)
	289	#define CxREALEVAL(c) (((c)->cx_type & (CXt_EVAL\|CXp_REAL)) == (CXt_EVAL\|CXp_REAL))
	290
79072805	291	#define CXINC (cxstack_ix < cxstack_max ? ++cxstack_ix : (cxstack_ix = cxinc()))
	292
	293	/* "gimme" values */
a0d0e21e	294	#define G_SCALAR 0
a0d0e21e	295	#define G_ARRAY 1
54310121	296	#define G_VOID 128 /* skip this bit when adding flags below */
79072805	297
864dbfa3	298	/* extra flags for Perl_call_* routines */
a0d0e21e	299	#define G_DISCARD 2 /* Call FREETMPS. */
	300	#define G_EVAL 4 /* Assume eval {} around subroutine call. */
	301	#define G_NOARGS 8 /* Don't construct a @_ array. */
54310121	302	#define G_KEEPERR 16 /* Append errors to $@, don't overwrite it */
491527d0	303	#define G_NODEBUG 32 /* Disable debugging at toplevel. */
a7c6d244	304	#define G_NOCATCH 64 /* Don't do CATCH_SET() */
e336de0d	305
faef0170	306	/* flag bits for PL_in_eval */
	307	#define EVAL_NULL 0 /* not in an eval */
	308	#define EVAL_INEVAL 1 /* some enclosing scope is an eval */
	309	#define EVAL_WARNONLY 2 /* used by yywarn() when calling yyerror() */
864dbfa3	310	#define EVAL_KEEPERR 4 /* set by Perl_call_sv if G_KEEPERR */
faef0170	311
e336de0d	312	/* Support for switching (stack and block) contexts.
	313	* This ensures magic doesn't invalidate local stack and cx pointers.
	314	*/
	315
e788e7d3	316	#define PERLSI_UNKNOWN -1
	317	#define PERLSI_UNDEF 0
	318	#define PERLSI_MAIN 1
	319	#define PERLSI_MAGIC 2
	320	#define PERLSI_SORT 3
	321	#define PERLSI_SIGNAL 4
	322	#define PERLSI_OVERLOAD 5
	323	#define PERLSI_DESTROY 6
	324	#define PERLSI_WARNHOOK 7
	325	#define PERLSI_DIEHOOK 8
	326	#define PERLSI_REQUIRE 9
e336de0d	327
	328	struct stackinfo {
	329	AV * si_stack; /* stack for current runlevel */
	330	PERL_CONTEXT * si_cxstack; /* context stack for runlevel */
	331	I32 si_cxix; /* current context index */
	332	I32 si_cxmax; /* maximum allocated index */
	333	I32 si_type; /* type of runlevel */
	334	struct stackinfo * si_prev;
	335	struct stackinfo * si_next;
	336	I32 * si_markbase; /* where markstack begins for us.
	337	* currently used only with DEBUGGING,
	338	* but not #ifdef-ed for bincompat */
	339	};
	340
	341	typedef struct stackinfo PERL_SI;
	342
3280af22	343	#define cxstack (PL_curstackinfo->si_cxstack)
	344	#define cxstack_ix (PL_curstackinfo->si_cxix)
	345	#define cxstack_max (PL_curstackinfo->si_cxmax)
e336de0d	346
e336de0d	347	#ifdef DEBUGGING
3280af22	348	# define SET_MARKBASE PL_curstackinfo->si_markbase = PL_markstack_ptr
e336de0d	349	#else
	350	# define SET_MARKBASE NOOP
	351	#endif
	352
d3acc0f7	353	#define PUSHSTACKi(type) \
e336de0d	354	STMT_START { \
3280af22	355	PERL_SI *next = PL_curstackinfo->si_next; \
e336de0d	356	if (!next) { \
e336de0d	357	next = new_stackinfo(32, 2048/sizeof(PERL_CONTEXT) - 1); \
3280af22	358	next->si_prev = PL_curstackinfo; \
3280af22	359	PL_curstackinfo->si_next = next; \
e336de0d	360	} \
	361	next->si_type = type; \
	362	next->si_cxix = -1; \
	363	AvFILLp(next->si_stack) = 0; \
3280af22	364	SWITCHSTACK(PL_curstack,next->si_stack); \
3280af22	365	PL_curstackinfo = next; \
e336de0d	366	SET_MARKBASE; \
	367	} STMT_END
	368
e788e7d3	369	#define PUSHSTACK PUSHSTACKi(PERLSI_UNKNOWN)
d3acc0f7	370
3095d977	371	/* POPSTACK works with PL_stack_sp, so it may need to be bracketed by
3095d977	372	* PUTBACK/SPAGAIN to flush/refresh any local SP that may be active */
d3acc0f7	373	#define POPSTACK \
e336de0d	374	STMT_START { \
de616352	375	djSP; \
3280af22	376	PERL_SI *prev = PL_curstackinfo->si_prev; \
e336de0d	377	if (!prev) { \
	378	PerlIO_printf(PerlIO_stderr(), "panic: POPSTACK\n"); \
	379	my_exit(1); \
	380	} \
3280af22	381	SWITCHSTACK(PL_curstack,prev->si_stack); \
e336de0d	382	/* don't free prev here, free them all at the END{} */ \
3280af22	383	PL_curstackinfo = prev; \
e336de0d	384	} STMT_END
	385
	386	#define POPSTACK_TO(s) \
	387	STMT_START { \
3280af22	388	while (PL_curstack != s) { \
bac4b2ad	389	dounwind(-1); \
d3acc0f7	390	POPSTACK; \
bac4b2ad	391	} \
e336de0d	392	} STMT_END