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/* cop.h
*
* Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
* 2000, 2001, 2002, 2003, 2004, 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.
*/
struct cop {
BASEOP
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_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 */
SV * cop_io; /* lexical IO defaults */
};
#define Nullcop Null(COP*)
#ifdef USE_ITHREADS
# define CopFILE(c) ((c)->cop_file)
# define CopFILEGV(c) (CopFILE(c) \
? gv_fetchfile(CopFILE(c)) : Nullgv)
# ifdef NETWARE
# define CopFILE_set(c,pv) ((c)->cop_file = savepv(pv))
# else
# define CopFILE_set(c,pv) ((c)->cop_file = savesharedpv(pv))
# endif
# define CopFILESV(c) (CopFILE(c) \
? GvSV(gv_fetchfile(CopFILE(c))) : Nullsv)
# define CopFILEAV(c) (CopFILE(c) \
? GvAV(gv_fetchfile(CopFILE(c))) : Nullav)
# define CopSTASHPV(c) ((c)->cop_stashpv)
# ifdef NETWARE
# define CopSTASHPV_set(c,pv) ((c)->cop_stashpv = ((pv) ? savepv(pv) : Nullch))
# else
# define CopSTASHPV_set(c,pv) ((c)->cop_stashpv = savesharedpv(pv))
# endif
# define CopSTASH(c) (CopSTASHPV(c) \
? gv_stashpv(CopSTASHPV(c),GV_ADD) : Nullhv)
# define CopSTASH_set(c,hv) CopSTASHPV_set(c, (hv) ? HvNAME_get(hv) : Nullch)
# 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) = Nullch))
# 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 CopFILESV(c) (CopFILEGV(c) ? GvSV(CopFILEGV(c)) : Nullsv)
# define CopFILEAV(c) (CopFILEGV(c) ? GvAV(CopFILEGV(c)) : Nullav)
# define CopFILE(c) (CopFILESV(c) ? SvPVX(CopFILESV(c)) : Nullch)
# define CopSTASH(c) ((c)->cop_stash)
# define CopSTASH_set(c,hv) ((c)->cop_stash = (hv))
# define CopSTASHPV(c) (CopSTASH(c) ? HvNAME_get(CopSTASH(c)) : Nullch)
/* 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) = Nullgv))
#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
/*
* Here we have some enormously heavy (or at least ponderous) wizardry.
*/
/* subroutine context */
struct block_sub {
CV * cv;
GV * gv;
GV * dfoutgv;
#ifndef USE_5005THREADS
AV * savearray;
#endif /* USE_5005THREADS */
AV * argarray;
long olddepth;
U8 hasargs;
U8 lval; /* XXX merge lval and hasargs? */
PAD *oldcomppad;
};
/* 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; \
if (!CvDEPTH(cv)) { \
(void)SvREFCNT_inc(cv); \
(void)SvREFCNT_inc(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.hasargs = 0; \
cx->blk_sub.dfoutgv = PL_defoutgv; \
(void)SvREFCNT_inc(cx->blk_sub.dfoutgv)
#ifdef USE_5005THREADS
# define POP_SAVEARRAY() NOOP
#else
# define POP_SAVEARRAY() \
STMT_START { \
SvREFCNT_dec(GvAV(PL_defgv)); \
GvAV(PL_defgv) = cx->blk_sub.savearray; \
} STMT_END
#endif /* USE_5005THREADS */
/* 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); \
SvPV_set(ary, (char*)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)) { \
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); \
AvFLAGS(cx->blk_sub.argarray) = AVf_REIFY; \
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 = Nullsv; \
} 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 {
I32 old_in_eval;
I32 old_op_type;
SV * old_namesv;
OP * old_eval_root;
SV * cur_text;
CV * cv;
};
#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) : Nullsv); \
cx->blk_eval.old_eval_root = PL_eval_root; \
cx->blk_eval.cur_text = PL_linestr; \
cx->blk_eval.cv = Nullcv; /* set by doeval(), as applicable */ \
} 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;
OP * redo_op;
OP * next_op;
OP * last_op;
#ifdef USE_ITHREADS
void * iterdata;
PAD *oldcomppad;
#else
SV ** itervar;
#endif
SV * itersave;
SV * iterlval;
AV * iterary;
IV iterix;
IV itermax;
};
#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 = Nullsv;
#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 = Nullsv;
#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.redo_op = cLOOP->op_redoop; \
cx->blk_loop.next_op = cLOOP->op_nextop; \
cx->blk_loop.last_op = cLOOP->op_lastop; \
cx->blk_loop.iterlval = Nullsv; \
cx->blk_loop.iterary = Nullav; \
cx->blk_loop.iterix = -1; \
CX_ITERDATA_SET(cx,dat);
#define POPLOOP(cx) \
SvREFCNT_dec(cx->blk_loop.iterlval); \
if (CxITERVAR(cx)) { \
SV **s_v_p = CxITERVAR(cx); \
sv_2mortal(*s_v_p); \
*s_v_p = cx->blk_loop.itersave; \
} \
if (cx->blk_loop.iterary && cx->blk_loop.iterary != PL_curstack)\
SvREFCNT_dec(cx->blk_loop.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 = (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, \
PL_retstack_ix = cx->blk_oldretsp, \
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_retstack_ix = cx->blk_oldretsp, \
PL_curpm = cx->blk_oldpm; \
DEBUG_SCOPE("TOPBLOCK");
/* 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
#define CXt_FORMAT 6
/* private flags for CXt_EVAL */
#define CXp_REAL 0x00000100 /* truly eval'', not a lookalike */
#define CXp_TRYBLOCK 0x00000200 /* eval{}, not eval'' or similar */
#ifdef USE_ITHREADS
/* private flags for CXt_LOOP */
# 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 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 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. */
/* 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 */
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_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 *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)
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