tree c22ee1b047d603a82be918ae9e496eef3282ce47
parent fc98dbfe65aa28dd628f117e8240aa2cd775aeba
author Than McIntosh <thanm@google.com> 1554907671 -0400
committer Than McIntosh <thanm@google.com> 1554920484 +0000

gollvm: fix bug in call->invoke instruction rewriting

During the control flow generation pass in gollvm, there is a pass
that rewrites call instructions to invoke instructions in situations
where this is needed due to the presence of a defer. The rewriter
wasn't properly handling the case where a given Bexpression was
inheriting the LLVM value of a child expression, and as a result the
compiler was crashing when trying to access a stale (deleted) LLVM
value.

Fixes golang/go#31388.

Change-Id: I6abc5ec87b3f63d2974126355a9d8fe18ec5ed1f
Reviewed-on: https://go-review.googlesource.com/c/gollvm/+/171357
Reviewed-by: Cherry Zhang <cherryyz@google.com>