| commit | c33d45a898ab1d966faba33d18acdffefb0fae0d | [log] [tgz] |
|---|---|---|
| author | Matthew Dempsky <mdempsky@google.com> | Thu Oct 03 10:49:28 2019 -0700 |
| committer | Matthew Dempsky <mdempsky@google.com> | Thu Oct 03 18:08:32 2019 +0000 |
| tree | 425b1208dde73aa82fb5e1adf8f9f382a50e46ee | |
| parent | 6b85fa80519615ae5fd58154277b47d77e5cf08b [diff] |
cmd/compile: don't statically copy string-typed variables
During package initialization, the compiler tries to optimize:
var A = "foo"
var B = A
into
var A = "foo"
var B = "foo"
so that we can statically initialize both A and B and skip emitting
dynamic initialization code to assign "B = A".
However, this isn't safe in the presence of cmd/link's -X flag, which
might overwrite an initialized string-typed variable at link time. In
particular, if cmd/link changes A's static initialization, it won't
know it also needs to change B's static initialization.
To address this, this CL disables this optimization for string-typed
variables.
Fixes #34675.
Change-Id: I1c18f3b855f6d7114aeb39f96aaaf1b452b88236
Reviewed-on: https://go-review.googlesource.com/c/go/+/198657
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
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