go double_nested_addressed_struct 源码
golang double_nested_addressed_struct 代码
文件路径：/test/abi/double_nested_addressed_struct.go
// run
//go:build !wasm
// +build !wasm
// 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.
// wasm is excluded because the compiler chatter about register abi pragma ends up
// on stdout, and causes the expected output to not match.
package main
import (
"fmt"
)
var sink *string
type stringPair struct {
a, b string
}
type stringPairPair struct {
x, y stringPair
}
// The goal of this test is to be sure that the call arg/result expander works correctly
// for a corner case of passing a 2-nested struct that fits in registers to/from calls.
// AND, the struct has its address taken.
//go:registerparams
//go:noinline
func H(spp stringPairPair) string {
F(&spp)
return spp.x.a + " " + spp.x.b + " " + spp.y.a + " " + spp.y.b
}
//go:registerparams
//go:noinline
func G(d, c, b, a string) stringPairPair {
return stringPairPair{stringPair{a, b}, stringPair{c, d}}
}
//go:registerparams
//go:noinline
func F(spp *stringPairPair) {
spp.x.a, spp.x.b, spp.y.a, spp.y.b = spp.y.b, spp.y.a, spp.x.b, spp.x.a
}
func main() {
spp := G("this", "is", "a", "test")
s := H(spp)
gotVsWant(s, "this is a test")
}
func gotVsWant(got, want string) {
if got != want {
fmt.Printf("FAIL, got %s, wanted %s\n", got, want)
}
}
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