/* $RCSfile: op.c,v $$Revision: 4.1 $$Date: 92/08/07 17:19:16 $
 *
 *    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:	op.c,v $
 */

#include "EXTERN.h"
#include "perl.h"

I32
cxinc()
{
    cxstack_max = cxstack_max * 3 / 2;
    Renew(cxstack, cxstack_max, CONTEXT);
    return cxstack_ix + 1;
}

void
push_return(retop)
OP *retop;
{
    if (retstack_ix == retstack_max) {
	retstack_max = retstack_max * 3 / 2;
	Renew(retstack, retstack_max, OP*);
    }
    retstack[retstack_ix++] = retop;
}

OP *
pop_return()
{
    if (retstack_ix > 0)
	return retstack[--retstack_ix];
    else
	return Nullop;
}

void
push_scope()
{
    if (scopestack_ix == scopestack_max) {
	scopestack_max = scopestack_max * 3 / 2;
	Renew(scopestack, scopestack_max, I32);
    }
    scopestack[scopestack_ix++] = savestack_ix;

}

void
pop_scope()
{
    I32 oldsave = scopestack[--scopestack_ix];
    LEAVE_SCOPE(oldsave);
}

void
savestack_grow()
{
    savestack_max = savestack_max * 3 / 2;
    Renew(savestack, savestack_max, ANY);
}

void
free_tmps()
{
    /* XXX should tmps_floor live in cxstack? */
    I32 myfloor = tmps_floor;
    while (tmps_ix > myfloor) {      /* clean up after last statement */
	SV* sv = tmps_stack[tmps_ix];
	tmps_stack[tmps_ix--] = Nullsv;
	if (sv) {
#ifdef DEBUGGING
	    SvTEMP_off(sv);
#endif
	    SvREFCNT_dec(sv);		/* note, can modify tmps_ix!!! */
	}
    }
}

SV *
save_scalar(gv)
GV *gv;
{
    register SV *sv;
    SV *osv = GvSV(gv);

    SSCHECK(3);
    SSPUSHPTR(gv);
    SSPUSHPTR(osv);
    SSPUSHINT(SAVEt_SV);

    sv = GvSV(gv) = NEWSV(0,0);
    if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv)) {
	sv_upgrade(sv, SvTYPE(osv));
	SvMAGIC(sv) = SvMAGIC(osv);
	localizing = TRUE;
	SvSETMAGIC(sv);
	localizing = FALSE;
    }
    return sv;
}

#ifdef INLINED_ELSEWHERE
void
save_gp(gv)
GV *gv;
{
    register GP *gp;
    GP *ogp = GvGP(gv);

    SSCHECK(3);
    SSPUSHPTR(gv);
    SSPUSHPTR(ogp);
    SSPUSHINT(SAVEt_GP);

    Newz(602,gp, 1, GP);
    GvGP(gv) = gp;
    GvREFCNT(gv) = 1;
    GvSV(gv) = NEWSV(72,0);
    GvLINE(gv) = curcop->cop_line;
    GvEGV(gv) = gv;
}
#endif

SV*
save_svref(sptr)
SV **sptr;
{
    register SV *sv;
    SV *osv = *sptr;

    SSCHECK(3);
    SSPUSHPTR(*sptr);
    SSPUSHPTR(sptr);
    SSPUSHINT(SAVEt_SVREF);

    sv = *sptr = NEWSV(0,0);
    if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(sv)) {
	sv_upgrade(sv, SvTYPE(osv));
	SvMAGIC(sv) = SvMAGIC(osv);
	localizing = TRUE;
	SvSETMAGIC(sv);
	localizing = FALSE;
    }
    return sv;
}

AV *
save_ary(gv)
GV *gv;
{
    SSCHECK(3);
    SSPUSHPTR(gv);
    SSPUSHPTR(GvAVn(gv));
    SSPUSHINT(SAVEt_AV);

    GvAV(gv) = Null(AV*);
    return GvAVn(gv);
}

HV *
save_hash(gv)
GV *gv;
{
    SSCHECK(3);
    SSPUSHPTR(gv);
    SSPUSHPTR(GvHVn(gv));
    SSPUSHINT(SAVEt_HV);

    GvHV(gv) = Null(HV*);
    return GvHVn(gv);
}

void
save_item(item)
register SV *item;
{
    register SV *sv;

    SSCHECK(3);
    SSPUSHPTR(item);		/* remember the pointer */
    sv = NEWSV(0,0);
    sv_setsv(sv,item);
    SSPUSHPTR(sv);		/* remember the value */
    SSPUSHINT(SAVEt_ITEM);
}

void
save_int(intp)
int *intp;
{
    SSCHECK(3);
    SSPUSHINT(*intp);
    SSPUSHPTR(intp);
    SSPUSHINT(SAVEt_INT);
}

void
save_I32(intp)
I32 *intp;
{
    SSCHECK(3);
    SSPUSHINT(*intp);
    SSPUSHPTR(intp);
    SSPUSHINT(SAVEt_I32);
}

void
save_sptr(sptr)
SV **sptr;
{
    SSCHECK(3);
    SSPUSHPTR(*sptr);
    SSPUSHPTR(sptr);
    SSPUSHINT(SAVEt_SPTR);
}

void
save_nogv(gv)
GV *gv;
{
    SSCHECK(2);
    SSPUSHPTR(gv);
    SSPUSHINT(SAVEt_NSTAB);
}

void
save_hptr(hptr)
HV **hptr;
{
    SSCHECK(3);
    SSPUSHINT(*hptr);
    SSPUSHPTR(hptr);
    SSPUSHINT(SAVEt_HPTR);
}

void
save_aptr(aptr)
AV **aptr;
{
    SSCHECK(3);
    SSPUSHINT(*aptr);
    SSPUSHPTR(aptr);
    SSPUSHINT(SAVEt_APTR);
}

void
save_freesv(sv)
SV *sv;
{
    SSCHECK(2);
    SSPUSHPTR(sv);
    SSPUSHINT(SAVEt_FREESV);
}

void
save_freeop(op)
OP *op;
{
    SSCHECK(2);
    SSPUSHPTR(op);
    SSPUSHINT(SAVEt_FREEOP);
}

void
save_freepv(pv)
char *pv;
{
    SSCHECK(2);
    SSPUSHPTR(pv);
    SSPUSHINT(SAVEt_FREEPV);
}

void
save_clearsv(svp)
SV** svp;
{
    SSCHECK(2);
    SSPUSHPTR(svp);
    SSPUSHINT(SAVEt_CLEARSV);
}

void
save_delete(hv,key,klen)
HV *hv;
char *key;
I32 klen;
{
    SSCHECK(4);
    SSPUSHINT(klen);
    SSPUSHPTR(key);
    SSPUSHPTR(hv);
    SSPUSHINT(SAVEt_DELETE);
}

void
save_list(sarg,maxsarg)
register SV **sarg;
I32 maxsarg;
{
    register SV *sv;
    register I32 i;

    SSCHECK(3 * maxsarg);
    for (i = 1; i <= maxsarg; i++) {
	SSPUSHPTR(sarg[i]);		/* remember the pointer */
	sv = NEWSV(0,0);
	sv_setsv(sv,sarg[i]);
	SSPUSHPTR(sv);			/* remember the value */
	SSPUSHINT(SAVEt_ITEM);
    }
}

void
leave_scope(base)
I32 base;
{
    register SV *sv;
    register SV *value;
    register GV *gv;
    register AV *av;
    register HV *hv;
    register void* ptr;

    if (base < -1)
	croak("panic: corrupt saved stack index");
    while (savestack_ix > base) {
	switch (SSPOPINT) {
	case SAVEt_ITEM:			/* normal string */
	    value = (SV*)SSPOPPTR;
	    sv = (SV*)SSPOPPTR;
	    sv_replace(sv,value);
	    SvSETMAGIC(sv);
	    break;
        case SAVEt_SV:				/* scalar reference */
	    value = (SV*)SSPOPPTR;
	    gv = (GV*)SSPOPPTR;
	    sv = GvSV(gv);
	    if (SvTYPE(sv) >= SVt_PVMG)
		SvMAGIC(sv) = 0;
            SvREFCNT_dec(sv);
            GvSV(gv) = sv = value;
	    SvSETMAGIC(sv);
            break;
        case SAVEt_SVREF:			/* scalar reference */
	    ptr = SSPOPPTR;
	    sv = *(SV**)ptr;
	    if (SvTYPE(sv) >= SVt_PVMG)
		SvMAGIC(sv) = 0;
            SvREFCNT_dec(sv);
	    *(SV**)ptr = sv = (SV*)SSPOPPTR;
	    SvSETMAGIC(sv);
            break;
        case SAVEt_AV:				/* array reference */
	    av = (AV*)SSPOPPTR;
	    gv = (GV*)SSPOPPTR;
            SvREFCNT_dec(GvAV(gv));
            GvAV(gv) = av;
            break;
        case SAVEt_HV:				/* hash reference */
	    hv = (HV*)SSPOPPTR;
	    gv = (GV*)SSPOPPTR;
            SvREFCNT_dec(GvHV(gv));
            GvHV(gv) = hv;
            break;
	case SAVEt_INT:				/* int reference */
	    ptr = SSPOPPTR;
	    *(int*)ptr = (int)SSPOPINT;
	    break;
	case SAVEt_I32:				/* I32 reference */
	    ptr = SSPOPPTR;
	    *(I32*)ptr = (I32)SSPOPINT;
	    break;
	case SAVEt_SPTR:			/* SV* reference */
	    ptr = SSPOPPTR;
	    *(SV**)ptr = (SV*)SSPOPPTR;
	    break;
	case SAVEt_HPTR:			/* HV* reference */
	    ptr = SSPOPPTR;
	    *(HV**)ptr = (HV*)SSPOPPTR;
	    break;
	case SAVEt_APTR:			/* AV* reference */
	    ptr = SSPOPPTR;
	    *(AV**)ptr = (AV*)SSPOPPTR;
	    break;
	case SAVEt_NSTAB:
	    gv = (GV*)SSPOPPTR;
	    (void)sv_clear(gv);
	    break;
        case SAVEt_GP:				/* scalar reference */
	    ptr = SSPOPPTR;
	    gv = (GV*)SSPOPPTR;
            gp_free(gv);
            GvGP(gv) = (GP*)ptr;
            break;
	case SAVEt_FREESV:
	    ptr = SSPOPPTR;
	    SvREFCNT_dec((SV*)ptr);
	    break;
	case SAVEt_FREEOP:
	    ptr = SSPOPPTR;
	    curpad = AvARRAY(comppad);
	    op_free((OP*)ptr);
	    break;
	case SAVEt_FREEPV:
	    ptr = SSPOPPTR;
	    Safefree((char*)ptr);
	    break;
	case SAVEt_CLEARSV:
	    ptr = SSPOPPTR;
	    sv = *(SV**)ptr;
	    if (SvREFCNT(sv) <= 1) {	/* Can clear pad variable in place. */
		if (SvTHINKFIRST(sv)) {
		    if (SvREADONLY(sv))
			croak("panic: leave_scope clearsv");
		    if (SvROK(sv))
			sv_unref(sv);
		}

		switch (SvTYPE(sv)) {
		case SVt_NULL:
		    break;
		case SVt_PVAV:
		    av_clear((AV*)sv);
		    break;
		case SVt_PVHV:
		    hv_clear((HV*)sv);
		    break;
		case SVt_PVCV:
		    sub_generation++;
		    cv_clear((CV*)sv);
		    break;
		default:
		    if (SvPOK(sv) && SvLEN(sv))
			SvOOK_off(sv);
		    SvOK_off(sv);
		    SvSETMAGIC(sv);
		    break;
		}
	    }
	    else {	/* Someone has a claim on this, so abandon it. */
		SvREFCNT_dec(sv);	/* Cast current value to the winds. */
		switch (SvTYPE(sv)) {	/* Console ourselves with a new value */
		case SVt_PVAV:	*(SV**)ptr = (SV*)newAV();	break;
		case SVt_PVHV:	*(SV**)ptr = (SV*)newHV();	break;
		default:	*(SV**)ptr = NEWSV(0,0);	break;
		}
	    }
	    break;
	case SAVEt_DELETE:
	    ptr = SSPOPPTR;
	    hv = (HV*)ptr;
	    ptr = SSPOPPTR;
	    hv_delete(hv, (char*)ptr, (U32)SSPOPINT);
	    break;
	default:
	    croak("panic: leave_scope inconsistency");
	}
    }
}

#ifdef DEBUGGING
void
cx_dump(cx)
CONTEXT* cx;
{
    fprintf(stderr, "CX %d = %s\n", cx - cxstack, block_type[cx->cx_type]);
    if (cx->cx_type != CXt_SUBST) {
	fprintf(stderr, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
	fprintf(stderr, "BLK_OLDCOP = 0x%lx\n", (long)cx->blk_oldcop);
	fprintf(stderr, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
	fprintf(stderr, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
	fprintf(stderr, "BLK_OLDRETSP = %ld\n", (long)cx->blk_oldretsp);
	fprintf(stderr, "BLK_OLDPM = 0x%lx\n", (long)cx->blk_oldpm);
	fprintf(stderr, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR");
    }
    switch (cx->cx_type) {
    case CXt_NULL:
    case CXt_BLOCK:
	break;
    case CXt_SUB:
	fprintf(stderr, "BLK_SUB.CV = 0x%lx\n",
		(long)cx->blk_sub.cv);
	fprintf(stderr, "BLK_SUB.GV = 0x%lx\n",
		(long)cx->blk_sub.gv);
	fprintf(stderr, "BLK_SUB.DFOUTGV = 0x%lx\n",
		(long)cx->blk_sub.dfoutgv);
	fprintf(stderr, "BLK_SUB.OLDDEPTH = %ld\n",
		(long)cx->blk_sub.olddepth);
	fprintf(stderr, "BLK_SUB.HASARGS = %d\n",
		(int)cx->blk_sub.hasargs);
	break;
    case CXt_EVAL:
	fprintf(stderr, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
		(long)cx->blk_eval.old_in_eval);
	fprintf(stderr, "BLK_EVAL.OLD_OP_TYPE = %s\n",
		op_name[cx->blk_eval.old_op_type]);
	fprintf(stderr, "BLK_EVAL.OLD_NAME = %s\n",
		cx->blk_eval.old_name);
	fprintf(stderr, "BLK_EVAL.OLD_EVAL_ROOT = 0x%lx\n",
		(long)cx->blk_eval.old_eval_root);
	break;

    case CXt_LOOP:
	fprintf(stderr, "BLK_LOOP.LABEL = %s\n",
		cx->blk_loop.label);
	fprintf(stderr, "BLK_LOOP.RESETSP = %ld\n",
		(long)cx->blk_loop.resetsp);
	fprintf(stderr, "BLK_LOOP.REDO_OP = 0x%lx\n",
		(long)cx->blk_loop.redo_op);
	fprintf(stderr, "BLK_LOOP.NEXT_OP = 0x%lx\n",
		(long)cx->blk_loop.next_op);
	fprintf(stderr, "BLK_LOOP.LAST_OP = 0x%lx\n",
		(long)cx->blk_loop.last_op);
	fprintf(stderr, "BLK_LOOP.ITERIX = %ld\n",
		(long)cx->blk_loop.iterix);
	fprintf(stderr, "BLK_LOOP.ITERARY = 0x%lx\n",
		(long)cx->blk_loop.iterary);
	fprintf(stderr, "BLK_LOOP.ITERVAR = 0x%lx\n",
		(long)cx->blk_loop.itervar);
	if (cx->blk_loop.itervar)
	    fprintf(stderr, "BLK_LOOP.ITERSAVE = 0x%lx\n",
		(long)cx->blk_loop.itersave);
	break;

    case CXt_SUBST:
	fprintf(stderr, "SB_ITERS = %ld\n",
		(long)cx->sb_iters);
	fprintf(stderr, "SB_MAXITERS = %ld\n",
		(long)cx->sb_maxiters);
	fprintf(stderr, "SB_SAFEBASE = %ld\n",
		(long)cx->sb_safebase);
	fprintf(stderr, "SB_ONCE = %ld\n",
		(long)cx->sb_once);
	fprintf(stderr, "SB_ORIG = %s\n",
		cx->sb_orig);
	fprintf(stderr, "SB_DSTR = 0x%lx\n",
		(long)cx->sb_dstr);
	fprintf(stderr, "SB_TARG = 0x%lx\n",
		(long)cx->sb_targ);
	fprintf(stderr, "SB_S = 0x%lx\n",
		(long)cx->sb_s);
	fprintf(stderr, "SB_M = 0x%lx\n",
		(long)cx->sb_m);
	fprintf(stderr, "SB_STREND = 0x%lx\n",
		(long)cx->sb_strend);
	fprintf(stderr, "SB_SUBBASE = 0x%lx\n",
		(long)cx->sb_subbase);
	break;
    }
}
#endif