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Matthew Dempsky 07513d208a 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>
2019-11-12 17:14:12 +00:00
.github .github: don't render author-facing text in ISSUE_TEMPLATE 2018-11-02 04:47:34 +00:00
api unicode: upgrade to Unicode 12 2019-11-05 14:34:56 +00:00
doc doc: document new math.Fma function 2019-11-07 21:59:39 +00:00
lib/time lib/time: update tz data to 2019b 2019-07-03 23:08:27 +00:00
misc misc: ensure that test overlay directories are writable 2019-11-11 17:59:46 +00:00
src cmd/compile: fix -m=2 infinite loop in escape.go 2019-11-12 17:14:12 +00:00
test cmd/compile: fix -m=2 infinite loop in escape.go 2019-11-12 17:14:12 +00:00
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CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
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