go ctl_test 源码
golang ctl_test 代码
文件路径：/src/cmd/compile/internal/test/testdata/ctl_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.
// Test control flow
package main
import "testing"
// nor_ssa calculates NOR(a, b).
// It is implemented in a way that generates
// phi control values.
func nor_ssa(a, b bool) bool {
var c bool
if a {
c = true
}
if b {
c = true
}
if c {
return false
}
return true
}
func testPhiControl(t *testing.T) {
tests := [...][3]bool{ // a, b, want
{false, false, true},
{true, false, false},
{false, true, false},
{true, true, false},
}
for _, test := range tests {
a, b := test[0], test[1]
got := nor_ssa(a, b)
want := test[2]
if want != got {
t.Errorf("nor(%t, %t)=%t got %t", a, b, want, got)
}
}
}
func emptyRange_ssa(b []byte) bool {
for _, x := range b {
_ = x
}
return true
}
func testEmptyRange(t *testing.T) {
if !emptyRange_ssa([]byte{}) {
t.Errorf("emptyRange_ssa([]byte{})=false, want true")
}
}
func switch_ssa(a int) int {
ret := 0
switch a {
case 5:
ret += 5
case 4:
ret += 4
case 3:
ret += 3
case 2:
ret += 2
case 1:
ret += 1
}
return ret
}
func fallthrough_ssa(a int) int {
ret := 0
switch a {
case 5:
ret++
fallthrough
case 4:
ret++
fallthrough
case 3:
ret++
fallthrough
case 2:
ret++
fallthrough
case 1:
ret++
}
return ret
}
func testFallthrough(t *testing.T) {
for i := 0; i < 6; i++ {
if got := fallthrough_ssa(i); got != i {
t.Errorf("fallthrough_ssa(i) = %d, wanted %d", got, i)
}
}
}
func testSwitch(t *testing.T) {
for i := 0; i < 6; i++ {
if got := switch_ssa(i); got != i {
t.Errorf("switch_ssa(i) = %d, wanted %d", got, i)
}
}
}
type junk struct {
step int
}
// flagOverwrite_ssa is intended to reproduce an issue seen where a XOR
// was scheduled between a compare and branch, clearing flags.
//
//go:noinline
func flagOverwrite_ssa(s *junk, c int) int {
if '0' <= c && c <= '9' {
s.step = 0
return 1
}
if c == 'e' || c == 'E' {
s.step = 0
return 2
}
s.step = 0
return 3
}
func testFlagOverwrite(t *testing.T) {
j := junk{}
if got := flagOverwrite_ssa(&j, ' '); got != 3 {
t.Errorf("flagOverwrite_ssa = %d, wanted 3", got)
}
}
func TestCtl(t *testing.T) {
testPhiControl(t)
testEmptyRange(t)
testSwitch(t)
testFallthrough(t)
testFlagOverwrite(t)
}
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