go append_test 源码
golang append_test 代码
文件路径：/src/cmd/compile/internal/test/testdata/append_test.go
// Copyright 2015 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.
// append_ssa.go tests append operations.
package main
import "testing"
//go:noinline
func appendOne_ssa(a []int, x int) []int {
return append(a, x)
}
//go:noinline
func appendThree_ssa(a []int, x, y, z int) []int {
return append(a, x, y, z)
}
func eqBytes(a, b []int) bool {
if len(a) != len(b) {
return false
}
for i := range a {
if a[i] != b[i] {
return false
}
}
return true
}
func expect(t *testing.T, got, want []int) {
if eqBytes(got, want) {
return
}
t.Errorf("expected %v, got %v\n", want, got)
}
func testAppend(t *testing.T) {
var store [7]int
a := store[:0]
a = appendOne_ssa(a, 1)
expect(t, a, []int{1})
a = appendThree_ssa(a, 2, 3, 4)
expect(t, a, []int{1, 2, 3, 4})
a = appendThree_ssa(a, 5, 6, 7)
expect(t, a, []int{1, 2, 3, 4, 5, 6, 7})
if &a[0] != &store[0] {
t.Errorf("unnecessary grow")
}
a = appendOne_ssa(a, 8)
expect(t, a, []int{1, 2, 3, 4, 5, 6, 7, 8})
if &a[0] == &store[0] {
t.Errorf("didn't grow")
}
}
func TestAppend(t *testing.T) {
testAppend(t)
}
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