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runtime: Add some diagnostic messages printing source of unmarked object

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Print out the object holding the reference to the object
that checkmark detects as not being properly marked.

Change-Id: Ieedbb6fddfaa65714504af9e7230bd9424cd0ae0
Reviewed-on: https://go-review.googlesource.com/2744
Reviewed-by: Austin Clements <austin@google.com>
This commit is contained in:
Rick Hudson 2015-01-13 15:36:42 -05:00
parent de47e9ca54
commit 0635706849
1 changed files with 21 additions and 1 deletions
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22
src/runtime/mgc.go
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@ -276,11 +276,31 @@ func greyobject(obj, base, off uintptr, hbits heapBits, wbuf *workbuf) *workbuf
print("runtime:greyobject: checkmarks finds unexpected unmarked object obj=", hex(obj), "\n")
print("runtime: found obj at *(", hex(base), "+", hex(off), ")\n")
// Dump the source (base) object
kb := base >> _PageShift
xb := kb
xb -= mheap_.arena_start >> _PageShift
sb := h_spans[xb]
printlock()
print("runtime:greyobject Span: base=", hex(base), " kb=", hex(kb))
if sb == nil {
print(" sb=nil\n")
} else {
print(" sb.start*_PageSize=", hex(sb.start*_PageSize), " sb.limit=", hex(sb.limit), " sb.sizeclass=", sb.sizeclass, " sb.elemsize=", sb.elemsize, "\n")
// base is (a pointer to) the source object holding the reference to object. Create a pointer to each of the fields
// fields in base and print them out as hex values.
for i := 0; i < int(sb.elemsize/ptrSize); i++ {
print(" *(base+", i*ptrSize, ") = ", hex(*(*uintptr)(unsafe.Pointer(base + uintptr(i)*ptrSize))), "\n")
}
}
// Dump the object
k := obj >> _PageShift
x := k
x -= mheap_.arena_start >> _PageShift
s := h_spans[x]
printlock()
print("runtime:greyobject Span: obj=", hex(obj), " k=", hex(k))
if s == nil {
print(" s=nil\n")