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runtime: fix out-of-bounds in stack debugging
Currently stackDebug=4 crashes as: panic: runtime error: index out of range fatal error: panic on system stack runtime stack: runtime.throw(0x607470, 0x15) src/runtime/panic.go:527 +0x96 runtime.gopanic(0x5ada00, 0xc82000a1d0) src/runtime/panic.go:354 +0xb9 runtime.panicindex() src/runtime/panic.go:12 +0x49 runtime.adjustpointers(0xc820065ac8, 0x7ffe58b56100, 0x7ffe58b56318, 0x0) src/runtime/stack1.go:428 +0x5fb runtime.adjustframe(0x7ffe58b56200, 0x7ffe58b56318, 0x1) src/runtime/stack1.go:542 +0x780 runtime.gentraceback(0x487760, 0xc820065ac0, 0x0, 0xc820001080, 0x0, 0x0, 0x7fffffff, 0x6341b8, 0x7ffe58b56318, 0x0, ...) src/runtime/traceback.go:336 +0xa7e runtime.copystack(0xc820001080, 0x1000) src/runtime/stack1.go:616 +0x3b1 runtime.newstack() src/runtime/stack1.go:801 +0xdde Change-Id: If2d60960231480a9dbe545d87385fe650d6db808 Reviewed-on: https://go-review.googlesource.com/12763 Reviewed-by: Russ Cox <rsc@golang.org>
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@ -425,7 +425,7 @@ func adjustpointers(scanp unsafe.Pointer, cbv *bitvector, adjinfo *adjustinfo, f
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num := uintptr(bv.n)
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for i := uintptr(0); i < num; i++ {
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if stackDebug >= 4 {
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print(" ", add(scanp, i*ptrSize), ":", ptrnames[ptrbit(&bv, i)], ":", hex(*(*uintptr)(add(scanp, i*ptrSize))), " # ", i, " ", bv.bytedata[i/4], "\n")
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print(" ", add(scanp, i*ptrSize), ":", ptrnames[ptrbit(&bv, i)], ":", hex(*(*uintptr)(add(scanp, i*ptrSize))), " # ", i, " ", bv.bytedata[i/8], "\n")
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}
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if ptrbit(&bv, i) == 1 {
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pp := (*uintptr)(add(scanp, i*ptrSize))
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