mirror of
https://github.com/golang/go
synced 2024-11-20 03:44:40 -07:00
e5c105033a
If you write:
var x = 3
then the compiler arranges for x to be initialized in the linker
with an actual 3 from the data segment, rather than putting
x in the bss and emitting init-time "x = 3" assignment code.
If you write:
var y = x
var x = 3
then the compiler is clever and treats this the same as if
the code said 'y = 3': they both end up in the data segment
with no init-time assignments.
If you write
var y = x
var x int
then the compiler was treating this the same as if the
code said 'x = 0', making both x and y zero and avoiding
any init-time assignment.
This copying optimization to avoid init-time assignment of y
is incorrect if 'var x int' doesn't mean 'x = 0' but instead means
'x is initialized in C or assembly code'. The program ends up
with 'y = 0' instead of 'y = the value specified for x in that other code'.
Disable the propagation if there is no initializer for x.
This comes up in some uses of cgo, because cgo generates
Go globals that are initialized in accompanying C files.
Fixes #7665.
LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews
https://golang.org/cl/93200044
57 lines
2.9 KiB
Go
57 lines
2.9 KiB
Go
// Copyright 2011 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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package cgotest
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import "testing"
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// The actual test functions are in non-_test.go files
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// so that they can use cgo (import "C").
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// These wrappers are here for gotest to find.
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func TestAlign(t *testing.T) { testAlign(t) }
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func TestConst(t *testing.T) { testConst(t) }
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func TestEnum(t *testing.T) { testEnum(t) }
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func TestAtol(t *testing.T) { testAtol(t) }
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func TestErrno(t *testing.T) { testErrno(t) }
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func TestMultipleAssign(t *testing.T) { testMultipleAssign(t) }
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func TestUnsignedInt(t *testing.T) { testUnsignedInt(t) }
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func TestCallback(t *testing.T) { testCallback(t) }
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func TestCallbackGC(t *testing.T) { testCallbackGC(t) }
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func TestCallbackPanic(t *testing.T) { testCallbackPanic(t) }
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func TestCallbackPanicLoop(t *testing.T) { testCallbackPanicLoop(t) }
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func TestCallbackPanicLocked(t *testing.T) { testCallbackPanicLocked(t) }
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func TestPanicFromC(t *testing.T) { testPanicFromC(t) }
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func TestZeroArgCallback(t *testing.T) { testZeroArgCallback(t) }
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func TestBlocking(t *testing.T) { testBlocking(t) }
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func Test1328(t *testing.T) { test1328(t) }
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func TestParallelSleep(t *testing.T) { testParallelSleep(t) }
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func TestSetEnv(t *testing.T) { testSetEnv(t) }
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func TestHelpers(t *testing.T) { testHelpers(t) }
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func TestLibgcc(t *testing.T) { testLibgcc(t) }
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func Test1635(t *testing.T) { test1635(t) }
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func TestPrintf(t *testing.T) { testPrintf(t) }
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func Test4029(t *testing.T) { test4029(t) }
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func TestBoolAlign(t *testing.T) { testBoolAlign(t) }
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func Test3729(t *testing.T) { test3729(t) }
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func Test3775(t *testing.T) { test3775(t) }
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func TestCthread(t *testing.T) { testCthread(t) }
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func TestCallbackCallers(t *testing.T) { testCallbackCallers(t) }
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func Test5227(t *testing.T) { test5227(t) }
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func TestCflags(t *testing.T) { testCflags(t) }
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func Test5337(t *testing.T) { test5337(t) }
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func Test5548(t *testing.T) { test5548(t) }
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func Test5603(t *testing.T) { test5603(t) }
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func Test6833(t *testing.T) { test6833(t) }
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func Test3250(t *testing.T) { test3250(t) }
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func TestCallbackStack(t *testing.T) { testCallbackStack(t) }
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func TestFpVar(t *testing.T) { testFpVar(t) }
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func Test4339(t *testing.T) { test4339(t) }
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func Test6390(t *testing.T) { test6390(t) }
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func Test5986(t *testing.T) { test5986(t) }
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func Test7665(t *testing.T) { test7665(t) }
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func TestNaming(t *testing.T) { testNaming(t) }
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func BenchmarkCgoCall(b *testing.B) { benchCgoCall(b) }
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