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tgs's gc bug.

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R=r
DELTA=10  (7 added, 0 deleted, 3 changed)
OCL=24577
CL=24577
This commit is contained in:
Russ Cox 2009-02-06 14:41:21 -08:00
parent 39d05ae808
commit 3e02987508
1 changed files with 10 additions and 3 deletions
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13
src/runtime/malloc.c
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@ -121,8 +121,8 @@ free(void *v)
int32
mlookup(void *v, byte **base, uintptr *size, uint32 **ref)
{
uintptr n, i;
byte *p;
uintptr n, nobj, i;
byte *p, *ep;
MSpan *s;
s = MHeap_LookupMaybe(&mheap, (uintptr)v>>PageShift);
@ -148,13 +148,20 @@ mlookup(void *v, byte **base, uintptr *size, uint32 **ref)
return 1;
}
if((byte*)v >= (byte*)s->gcref) {
// pointers into the gc ref counts
// do not count as pointers.
return 0;
}
n = class_to_size[s->sizeclass];
i = ((byte*)v - p)/n;
if(base)
*base = p + i*n;
if(size)
*size = n;
if((byte*)s->gcref < p || (byte*)s->gcref >= p+(s->npages<<PageShift)) {
nobj = (s->npages << PageShift) / (n + RefcountOverhead);
if((byte*)s->gcref < p || (byte*)(s->gcref+nobj) > p+(s->npages<<PageShift)) {
printf("s->base sizeclass %d %p gcref %p block %D\n",
s->sizeclass, p, s->gcref, s->npages<<PageShift);
throw("bad gcref");