go main 源码
golang main 代码
文件路径：/test/asmhdr.dir/main.go
// Copyright 2021 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 "unsafe"
const (
smallInt = 42
// For bigInt, we use a value that's too big for an int64, but still
// fits in uint64. go/constant uses a different representation for
// values larger than int64, but the cmd/asm parser can't parse
// anything bigger than a uint64.
bigInt = 0xffffffffffffffff
stringVal = "test"
longStringVal = "this_is_a_string_constant_longer_than_seventy_characters_which_used_to_fail_see_issue_50253"
)
var (
smallIntAsm int64
bigIntAsm uint64
stringAsm [len(stringVal)]byte
longStringAsm [len(longStringVal)]byte
)
type typ struct {
a uint64
b [100]uint8
c uint8
}
var (
typSize uint64
typA, typB, typC uint64
)
func main() {
if smallInt != smallIntAsm {
println("smallInt", smallInt, "!=", smallIntAsm)
}
if bigInt != bigIntAsm {
println("bigInt", uint64(bigInt), "!=", bigIntAsm)
}
if stringVal != string(stringAsm[:]) {
println("stringVal", stringVal, "!=", string(stringAsm[:]))
}
if longStringVal != string(longStringAsm[:]) {
println("longStringVal", longStringVal, "!=", string(longStringAsm[:]))
}
// We also include boolean consts in go_asm.h, but they're
// defined to be "true" or "false", and it's not clear how to
// use that in assembly.
if want := unsafe.Sizeof(typ{}); want != uintptr(typSize) {
println("typSize", want, "!=", typSize)
}
if want := unsafe.Offsetof(typ{}.a); want != uintptr(typA) {
println("typA", want, "!=", typA)
}
if want := unsafe.Offsetof(typ{}.b); want != uintptr(typB) {
println("typB", want, "!=", typB)
}
if want := unsafe.Offsetof(typ{}.c); want != uintptr(typC) {
println("typC", want, "!=", typC)
}
}
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