8477562ce5
For range loops, we use a pointer to the backing store that gets incremented on each iteration of the loop. The problem with this scheme is that at the end of the last iteration, we may briefly have a pointer that points past the end of the backing store of the slice that is being iterated over. We cannot let the garbage collector see that pointer. To fix this problem, have the incremented pointer live briefly as a uintptr instead of a normal pointer, so it doesn't keep anything alive. Convert back to a normal pointer just after the loop condition is checked, but before anything that requires a real pointer representation (in practice, any call, which is what could cause a GC scan or stack copy). Fixes #56699 Change-Id: Ia928d23f85a211565357603668bea4e5c534f989 Reviewed-on: https://go-review.googlesource.com/c/go/+/449995 Reviewed-by: David Chase <drchase@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Keith Randall <khr@google.com> Run-TryBot: Keith Randall <khr@golang.org> Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com> |
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The Go Programming Language
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