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cmd/compile: don't ICE on unaligned offsets for pointer writes

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User code is unlikely to be correct, but don't crash the compiler
when the offset of a pointer in an object is not a multiple of the
pointer size.

Fixes #61187

Change-Id: Ie56bfcb38556c5dd6f702ae4ec1d4534c6acd420
Reviewed-on: https://go-review.googlesource.com/c/go/+/508555
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
This commit is contained in:
Keith Randall 2023-07-08 08:46:37 -07:00
parent 5c15498609
commit c4db811e44
2 changed files with 27 additions and 2 deletions
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7
src/cmd/compile/internal/ssa/writebarrier.go
View file

@ -53,7 +53,10 @@ func mightContainHeapPointer(ptr *Value, size int64, mem *Value, zeroes map[ID]Z
}
ptrSize := ptr.Block.Func.Config.PtrSize
if off%ptrSize != 0 || size%ptrSize != 0 {
if off%ptrSize != 0 {
return true // see issue 61187
}
if size%ptrSize != 0 {
ptr.Fatalf("unaligned pointer write")
}
if off < 0 || off+size > 64*ptrSize {
@ -130,7 +133,7 @@ func needWBdst(ptr, mem *Value, zeroes map[ID]ZeroRegion) bool {
}
ptrSize := ptr.Block.Func.Config.PtrSize
if off%ptrSize != 0 {
ptr.Fatalf("unaligned pointer write")
return true // see issue 61187
}
if off < 0 || off >= 64*ptrSize {
// write goes off end of tracked offsets