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c33d45a898
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>
33 lines
609 B
Go
33 lines
609 B
Go
// skip
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// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Test the -X facility of the gc linker (6l etc.).
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// This test is run by linkx_run.go.
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package main
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import "fmt"
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var tbd string
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var overwrite string = "dibs"
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var tbdcopy = tbd
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var overwritecopy = overwrite
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var arraycopy = [2]string{tbd, overwrite}
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var b bool
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var x int
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func main() {
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fmt.Println(tbd)
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fmt.Println(tbdcopy)
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fmt.Println(arraycopy[0])
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fmt.Println(overwrite)
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fmt.Println(overwritecopy)
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fmt.Println(arraycopy[1])
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}
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