diff options
Diffstat (limited to 'src/runtime/mgc0.c')
| -rw-r--r-- | src/runtime/mgc0.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/src/runtime/mgc0.c b/src/runtime/mgc0.c index 3c4d1afa5..214b9ebc2 100644 --- a/src/runtime/mgc0.c +++ b/src/runtime/mgc0.c @@ -29,8 +29,7 @@ // Preempted goroutines are scanned before P schedules next goroutine. // 3. Set phase = GCmark. // 4. Wait for all P's to acknowledge phase change. -// 5. Now write barrier marks and enqueues black or grey to white pointers. If a pointer is -// stored into a white slot, such pointer is not marked. +// 5. Now write barrier marks and enqueues black, grey, or white to white pointers. // Malloc still allocates white (non-marked) objects. // 6. Meanwhile GC transitively walks the heap marking reachable objects. // 7. When GC finishes marking heap, it preempts P's one-by-one and @@ -446,7 +445,25 @@ greyobject(byte *obj, Markbits *mbits, Workbuf *wbuf) if(checkmark) { if(!ismarked(mbits)) { + MSpan *s; + pageID k; + uintptr x, i; + runtime·printf("runtime:greyobject: checkmarks finds unexpected unmarked object obj=%p, mbits->bits=%x, *mbits->bitp=%x\n", obj, mbits->bits, *mbits->bitp); + + k = (uintptr)obj>>PageShift; + x = k; + x -= (uintptr)runtime·mheap.arena_start>>PageShift; + s = runtime·mheap.spans[x]; + runtime·printf("runtime:greyobject Span: obj=%p, k=%p", obj, k); + if (s == nil) { + runtime·printf(" s=nil\n"); + } else { + runtime·printf(" s->start=%p s->limit=%p, s->state=%d, s->sizeclass=%d, s->elemsize=%D \n", s->start*PageSize, s->limit, s->state, s->sizeclass, s->elemsize); + for(i=0; i<s->sizeclass; i++) { + runtime·printf(" ((uintptr*)obj)[%D]=%p\n", i, ((uintptr*)obj)[i]); + } + } runtime·throw("checkmark found unmarked object"); } if(ischeckmarked(mbits)) |