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runtime: print debug info on "base out of range"

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This adds debugging information when we panic with "heapBitsForSpan:
base out of range".

Updates #20259.

Change-Id: I0dc1a106aa9e9531051c7d08867ace5ef230eb3f
Reviewed-on: https://go-review.googlesource.com/43310
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Austin Clements 2017-05-11 15:22:10 -04:00
parent dddd1dd481
commit 29e88d5130
1 changed files with 1 additions and 0 deletions
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src/runtime/mbitmap.go
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@ -364,6 +364,7 @@ func heapBitsForAddr(addr uintptr) heapBits {
// heapBitsForSpan returns the heapBits for the span base address base.
func heapBitsForSpan(base uintptr) (hbits heapBits) {
if base < mheap_.arena_start || base >= mheap_.arena_used {
print("runtime: base ", hex(base), " not in range [", hex(mheap_.arena_start), ",", hex(mheap_.arena_used), ")\n")
throw("heapBitsForSpan: base out of range")
}
return heapBitsForAddr(base)