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scope.c
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C/C++ Source or Header
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1996-09-28
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14KB
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702 lines
/* scope.c
*
* Copyright (c) 1991-1994, 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.
*
*/
/*
* "For the fashion of Minas Tirith was such that it was built on seven
* levels..."
*/
#include "EXTERN.h"
#include "perl.h"
SV**
stack_grow(sp, p, n)
SV** sp;
SV** p;
int n;
{
stack_sp = sp;
av_extend(stack, (p - stack_base) + (n) + 128);
return stack_sp;
}
I32
cxinc()
{
cxstack_max = cxstack_max * 3 / 2;
Renew(cxstack, cxstack_max + 1, CONTEXT); /* XXX should fix CXINC macro */
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
markstack_grow()
{
I32 oldmax = markstack_max - markstack;
I32 newmax = oldmax * 3 / 2;
Renew(markstack, newmax, I32);
markstack_ptr = markstack + oldmax;
markstack_max = markstack + newmax;
}
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) && SvTYPE(osv) != SVt_PVGV) {
sv_upgrade(sv, SvTYPE(osv));
if (SvGMAGICAL(osv)) {
MAGIC* mg;
bool oldtainted = tainted;
mg_get(osv);
if (tainting && tainted && (mg = mg_find(osv, 't'))) {
SAVESPTR(mg->mg_obj);
mg->mg_obj = osv;
}
SvFLAGS(osv) |= (SvFLAGS(osv) &
(SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
tainted = oldtainted;
}
SvMAGIC(sv) = SvMAGIC(osv);
SvFLAGS(sv) |= SvMAGICAL(osv);
localizing = 1;
SvSETMAGIC(sv);
localizing = 0;
}
return sv;
}
#ifdef INLINED_ELSEWHERE
void
save_gp(gv)
GV *gv;
{
register GP *gp;
GP *ogp = GvGP(gv);
SSCHECK(3);
SSPUSHPTR(SvREFCNT_inc(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(osv) && SvTYPE(osv) != SVt_PVGV) {
sv_upgrade(sv, SvTYPE(osv));
if (SvGMAGICAL(osv)) {
MAGIC* mg;
bool oldtainted = tainted;
mg_get(osv);
if (tainting && tainted && (mg = mg_find(osv, 't'))) {
SAVESPTR(mg->mg_obj);
mg->mg_obj = osv;
}
SvFLAGS(osv) |= (SvFLAGS(osv) &
(SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
tainted = oldtainted;
}
SvMAGIC(sv) = SvMAGIC(osv);
SvFLAGS(sv) |= SvMAGICAL(osv);
localizing = 1;
SvSETMAGIC(sv);
localizing = 0;
}
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_long(longp)
long *longp;
{
SSCHECK(3);
SSPUSHLONG(*longp);
SSPUSHPTR(longp);
SSPUSHINT(SAVEt_LONG);
}
void
save_I32(intp)
I32 *intp;
{
SSCHECK(3);
SSPUSHINT(*intp);
SSPUSHPTR(intp);
SSPUSHINT(SAVEt_I32);
}
void
save_iv(ivp)
IV *ivp;
{
SSCHECK(3);
SSPUSHIV(*ivp);
SSPUSHPTR(ivp);
SSPUSHINT(SAVEt_IV);
}
/* Cannot use save_sptr() to store a char* since the SV** cast will
* force word-alignment and we'll miss the pointer.
*/
void
save_pptr(pptr)
char **pptr;
{
SSCHECK(3);
SSPUSHPTR(*pptr);
SSPUSHPTR(pptr);
SSPUSHINT(SAVEt_PPTR);
}
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);
SSPUSHPTR(*hptr);
SSPUSHPTR(hptr);
SSPUSHINT(SAVEt_HPTR);
}
void
save_aptr(aptr)
AV **aptr;
{
SSCHECK(3);
SSPUSHPTR(*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);
SSPUSHLONG((long)(svp-curpad));
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
save_destructor(f,p)
void (*f) _((void*));
void* p;
{
SSCHECK(3);
SSPUSHDPTR(f);
SSPUSHPTR(p);
SSPUSHINT(SAVEt_DESTRUCTOR);
}
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);
localizing = 2;
SvSETMAGIC(sv);
localizing = 0;
break;
case SAVEt_SV: /* scalar reference */
value = (SV*)SSPOPPTR;
gv = (GV*)SSPOPPTR;
sv = GvSV(gv);
if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv) &&
SvTYPE(sv) != SVt_PVGV)
{
(void)SvUPGRADE(value, SvTYPE(sv));
SvMAGIC(value) = SvMAGIC(sv);
SvFLAGS(value) |= SvMAGICAL(sv);
SvMAGICAL_off(sv);
SvMAGIC(sv) = 0;
}
SvREFCNT_dec(sv);
GvSV(gv) = value;
localizing = 2;
SvSETMAGIC(value);
localizing = 0;
break;
case SAVEt_SVREF: /* scalar reference */
ptr = SSPOPPTR;
sv = *(SV**)ptr;
value = (SV*)SSPOPPTR;
if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv) &&
SvTYPE(sv) != SVt_PVGV)
{
(void)SvUPGRADE(value, SvTYPE(sv));
SvMAGIC(value) = SvMAGIC(sv);
SvFLAGS(value) |= SvMAGICAL(sv);
SvMAGICAL_off(sv);
SvMAGIC(sv) = 0;
}
SvREFCNT_dec(sv);
*(SV**)ptr = value;
localizing = 2;
SvSETMAGIC(value);
localizing = 0;
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_LONG: /* long reference */
ptr = SSPOPPTR;
*(long*)ptr = (long)SSPOPLONG;
break;
case SAVEt_I32: /* I32 reference */
ptr = SSPOPPTR;
*(I32*)ptr = (I32)SSPOPINT;
break;
case SAVEt_IV: /* IV reference */
ptr = SSPOPPTR;
*(IV*)ptr = (IV)SSPOPIV;
break;
case SAVEt_SPTR: /* SV* reference */
ptr = SSPOPPTR;
*(SV**)ptr = (SV*)SSPOPPTR;
break;
case SAVEt_PPTR: /* char* reference */
ptr = SSPOPPTR;
*(char**)ptr = (char*)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;
SvREFCNT_dec(gv);
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 = (void*)&curpad[SSPOPLONG];
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);
}
if (SvMAGICAL(sv))
mg_free(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_undef((CV*)sv);
break;
default:
if (SvPOK(sv) && SvLEN(sv))
(void)SvOOK_off(sv);
(void)SvOK_off(sv);
break;
}
}
else { /* Someone has a claim on this, so abandon it. */
U32 padflags = SvFLAGS(sv) & (SVs_PADBUSY|SVs_PADMY|SVs_PADTMP);
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;
}
SvFLAGS(*(SV**)ptr) |= padflags; /* preserve pad nature */
}
break;
case SAVEt_DELETE:
ptr = SSPOPPTR;
hv = (HV*)ptr;
ptr = SSPOPPTR;
(void)hv_delete(hv, (char*)ptr, (U32)SSPOPINT, G_DISCARD);
Safefree(ptr);
break;
case SAVEt_DESTRUCTOR:
ptr = SSPOPPTR;
(*SSPOPDPTR)(ptr);
break;
case SAVEt_REGCONTEXT:
{
I32 delta = SSPOPINT;
savestack_ix -= delta; /* regexp must have croaked */
}
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 (%s)\n",
op_name[cx->blk_eval.old_op_type],
op_desc[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