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/* $RCSfile: cmd.h,v $$Revision: 4.1 $$Date: 92/08/07 17:19:19 $
*
* Copyright (c) 1991, 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.
*
* $Log: cmd.h,v $
* Revision 4.1 92/08/07 17:19:19 lwall
* Stage 6 Snapshot
*
* Revision 4.0.1.2 92/06/08 12:01:02 lwall
* patch20: removed implicit int declarations on funcions
*
* Revision 4.0.1.1 91/06/07 10:28:50 lwall
* patch4: new copyright notice
* patch4: length($`), length($&), length($') now optimized to avoid string copy
*
* Revision 4.0 91/03/20 01:04:34 lwall
* 4.0 baseline.
*
*/
struct acop {
GV *acop_gv; /* a symbol table entry */
OP *acop_expr; /* any associated expression */
};
struct ccop {
OP *ccop_true; /* normal code to do on if and while */
OP *ccop_alt; /* else cmd ptr or continue code */
};
struct scop {
OP **scop_next; /* array of pointers to commands */
short scop_offset; /* first value - 1 */
short scop_max; /* last value + 1 */
};
struct cop {
BASEOP
OP *cop_expr; /* conditional expression */
OP *cop_head; /* head of this command list */
SV *cop_short; /* string to match as shortcut */
GV *cop_gv; /* a symbol table entry, mostly for fp */
char *cop_label; /* label for this construct */
union uop {
struct acop acop; /* normal command */
struct ccop ccop; /* compound command */
struct scop scop; /* switch command */
} uop;
U32 cop_seq; /* parse sequence number */
short cop_slen; /* len of cop_short, if not null */
VOL short cop_flags; /* optimization flags--see above */
HV * cop_stash; /* package line was compiled in */
GV * cop_filegv; /* file the following line # is from */
line_t cop_line; /* line # of this command */
char cop_type; /* what this command does */
};
#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;
AV * savearray;
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.dfoutgv = defoutgv; \
cx->blk_sub.hasargs = 0;
#define POPSUB(cx) \
if (cx->blk_sub.hasargs) { /* put back old @_ */ \
GvAV(defgv) = cx->blk_sub.savearray; \
} \
if (cx->blk_sub.cv) { \
if (!(CvDEPTH(cx->blk_sub.cv) = cx->blk_sub.olddepth)) { \
if (CvDELETED(cx->blk_sub.cv)) \
SvREFCNT_dec((SV*)cx->blk_sub.cv); \
} \
}
#define POPFORMAT(cx) \
defoutgv = cx->blk_sub.dfoutgv;
/* eval context */
struct block_eval {
I32 old_in_eval;
I32 old_op_type;
char * old_name;
OP * old_eval_root;
};
#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;
#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;
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; \
cx->blk_loop.itervar = ivar; \
if (ivar) \
cx->blk_loop.itersave = *cx->blk_loop.itervar;
#define POPLOOP(cx) \
newsp = stack_base + cx->blk_loop.resetsp; \
if (cx->blk_loop.itervar) \
*cx->blk_loop.itervar = cx->blk_loop.itersave;
/* 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( fprintf(stderr,"Entering block %d, type %s\n", \
cxstack_ix, block_type[t]); )
/* Exit a block (RETURN and LAST). */
#define POPBLOCK(cx) 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, \
curpm = cx->blk_oldpm, \
gimme = cx->blk_gimme; \
DEBUG_l( fprintf(stderr,"Leaving block %d, type %s\n", \
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_once;
char * sbu_orig;
SV * sbu_dstr;
SV * sbu_targ;
char * sbu_s;
char * sbu_m;
char * sbu_strend;
char * sbu_subbase;
};
#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_once cx_u.cx_subst.sbu_once
#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_subbase cx_u.cx_subst.sbu_subbase
#define PUSHSUBST(cx) CXINC, cx = &cxstack[cxstack_ix], \
cx->sb_iters = iters, \
cx->sb_maxiters = maxiters, \
cx->sb_safebase = safebase, \
cx->sb_once = once, \
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->cx_type = CXt_SUBST
#define POPSUBST(cx) cxstack_ix--
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
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