go main 源码
golang main 代码
文件路径：/misc/cgo/testshared/testdata/global/main.go
// Copyright 2017 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.
package main
import (
"testshared/globallib"
)
//go:noinline
func testLoop() {
for i, s := range globallib.Data {
if s != int64(i) {
panic("testLoop: mismatch")
}
}
}
//go:noinline
func ptrData() *[1<<20 + 10]int64 {
return &globallib.Data
}
//go:noinline
func testMediumOffset() {
for i, s := range globallib.Data[1<<16-2:] {
if s != int64(i)+1<<16-2 {
panic("testMediumOffset: index mismatch")
}
}
x := globallib.Data[1<<16-1]
if x != 1<<16-1 {
panic("testMediumOffset: direct mismatch")
}
y := &globallib.Data[1<<16-3]
if y != &ptrData()[1<<16-3] {
panic("testMediumOffset: address mismatch")
}
}
//go:noinline
func testLargeOffset() {
for i, s := range globallib.Data[1<<20:] {
if s != int64(i)+1<<20 {
panic("testLargeOffset: index mismatch")
}
}
x := globallib.Data[1<<20+1]
if x != 1<<20+1 {
panic("testLargeOffset: direct mismatch")
}
y := &globallib.Data[1<<20+2]
if y != &ptrData()[1<<20+2] {
panic("testLargeOffset: address mismatch")
}
}
func main() {
testLoop()
// SSA rules commonly merge offsets into addresses. These
// tests access global data in different ways to try
// and exercise different SSA rules.
testMediumOffset()
testLargeOffset()
}
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