mirror of
https://github.com/golang/go
synced 2024-11-23 07:40:04 -07:00
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
|
|
|
|
// Copyright 2012 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// Test the -X facility of the gc linker (6l etc.).
|
|
// This test is run by linkx_run.go.
|
|
|
|
package main
|
|
|
|
import "fmt"
|
|
|
|
var tbd string
|
|
var overwrite string = "dibs"
|
|
|
|
var tbdcopy = tbd
|
|
var overwritecopy = overwrite
|
|
var arraycopy = [2]string{tbd, overwrite}
|
|
|
|
var b bool
|
|
var x int
|
|
|
|
func main() {
|
|
fmt.Println(tbd)
|
|
fmt.Println(tbdcopy)
|
|
fmt.Println(arraycopy[0])
|
|
|
|
fmt.Println(overwrite)
|
|
fmt.Println(overwritecopy)
|
|
fmt.Println(arraycopy[1])
|
|
}
|