tree 9ffbfb69aacf8a66414142c74e83a57992063b55
parent fc7ee0ba2c9f284ea2d4a37a0c133524e94d88cd
author Matthew Dempsky <mdempsky@google.com> 1573519534 -0800
committer David Chase <drchase@google.com> 1573578852 +0000

cmd/compile: fix -m=2 infinite loop in escape.go

This CL detects infinite loops due to negative dereference cycles
during escape analysis, and terminates the loop gracefully. We still
fail to print a complete explanation of the escape path, but esc.go
didn't print *any* explanation for these test cases, so the release
blocking issue here is simply that we don't infinite loop.

Updates #35518.

Change-Id: I39beed036e5a685706248852f1fa619af3b7abbc
Reviewed-on: https://go-review.googlesource.com/c/go/+/206619
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>