go-tools/go/ir/dom_test.go at master · dominikh/go-tools

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// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

package ir_test

import (

"fmt"

"path/filepath"

"testing"

"honnef.co/go/tools/go/ir/irutil"

"honnef.co/go/tools/internal/xtools-internal/testenv"

"golang.org/x/tools/go/packages"

)

func TestDominatorOrder(t *testing.T) {

testenv.NeedsGoBuild(t) // for go/packages

const src = `package p

func f(cond bool) {

// (Print operands match BasicBlock IDs.)

print(0)

if cond {

print(1)

} else {

print(2)

}

print(3)

}

dir := t.TempDir()

cfg := &packages.Config{

Dir: dir,

Mode: packages.LoadSyntax,

Overlay: map[string][]byte{

filepath.Join(dir, "p.go"): []byte(src),

}

initial, err := packages.Load(cfg, "./p.go")

if err != nil {

t.Fatal(err)

}

if packages.PrintErrors(initial) > 0 {

t.Fatal("packages contain errors")

}

_, pkgs := irutil.Packages(initial, 0)

p := pkgs[0]

p.Build()

f := p.Func("f")

if got, want := fmt.Sprint(f.DomPreorder()), "[0 1 2 3]"; got != want {

t.Errorf("DomPreorder: got %v, want %s", got, want)

}

if got, want := fmt.Sprint(f.DomPostorder()), "[1 2 3 0]"; got != want {

t.Errorf("DomPostorder: got %v, want %s", got, want)

}

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