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runtime: factor out debug.invalidptr case in findObject

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This helps keeping findObject's frame small.

Updates #35068

Change-Id: I1b8c1fcc5831944c86f1a30ed2f2d867a5f2b242
Reviewed-on: https://go-review.googlesource.com/c/go/+/202797
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
This commit is contained in:
Cuong Manh Le 2019-10-23 14:28:55 +07:00 committed by Austin Clements
parent 80315322f3
commit 813d8e8862
1 changed files with 27 additions and 23 deletions
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50
src/runtime/mbitmap.go
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@ -349,6 +349,32 @@ func heapBitsForAddr(addr uintptr) (h heapBits) {
return
}
// badPointer throws bad pointer in heap panic.
func badPointer(s *mspan, p, refBase, refOff uintptr) {
// Typically this indicates an incorrect use
// of unsafe or cgo to store a bad pointer in
// the Go heap. It may also indicate a runtime
// bug.
//
// TODO(austin): We could be more aggressive
// and detect pointers to unallocated objects
// in allocated spans.
printlock()
print("runtime: pointer ", hex(p))
if s.state != mSpanInUse {
print(" to unallocated span")
} else {
print(" to unused region of span")
}
print(" span.base()=", hex(s.base()), " span.limit=", hex(s.limit), " span.state=", s.state, "\n")
if refBase != 0 {
print("runtime: found in object at *(", hex(refBase), "+", hex(refOff), ")\n")
gcDumpObject("object", refBase, refOff)
}
getg().m.traceback = 2
throw("found bad pointer in Go heap (incorrect use of unsafe or cgo?)")
}
// findObject returns the base address for the heap object containing
// the address p, the object's span, and the index of the object in s.
// If p does not point into a heap object, it returns base == 0.
@ -372,32 +398,10 @@ func findObject(p, refBase, refOff uintptr) (base uintptr, s *mspan, objIndex ui
if s.state == mSpanManual {
return
}
// The following ensures that we are rigorous about what data
// structures hold valid pointers.
if debug.invalidptr != 0 {
// Typically this indicates an incorrect use
// of unsafe or cgo to store a bad pointer in
// the Go heap. It may also indicate a runtime
// bug.
//
// TODO(austin): We could be more aggressive
// and detect pointers to unallocated objects
// in allocated spans.
printlock()
print("runtime: pointer ", hex(p))
if s.state != mSpanInUse {
print(" to unallocated span")
} else {
print(" to unused region of span")
}
print(" span.base()=", hex(s.base()), " span.limit=", hex(s.limit), " span.state=", s.state, "\n")
if refBase != 0 {
print("runtime: found in object at *(", hex(refBase), "+", hex(refOff), ")\n")
gcDumpObject("object", refBase, refOff)
}
getg().m.traceback = 2
throw("found bad pointer in Go heap (incorrect use of unsafe or cgo?)")
badPointer(s, p, refBase, refOff)
}
return
}