113 lines
2.4 KiB
Go
113 lines
2.4 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build go1.5
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// No testdata on Android.
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// +build !android
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package cha_test
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import (
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"bytes"
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"fmt"
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"go/ast"
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"go/parser"
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"go/token"
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"go/types"
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"io/ioutil"
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"sort"
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"strings"
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"testing"
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"golang.org/x/tools/go/callgraph"
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"golang.org/x/tools/go/callgraph/cha"
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"golang.org/x/tools/go/loader"
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"golang.org/x/tools/go/ssa/ssautil"
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)
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var inputs = []string{
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"testdata/func.go",
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"testdata/iface.go",
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"testdata/recv.go",
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}
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func expectation(f *ast.File) (string, token.Pos) {
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for _, c := range f.Comments {
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text := strings.TrimSpace(c.Text())
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if t := strings.TrimPrefix(text, "WANT:\n"); t != text {
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return t, c.Pos()
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}
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}
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return "", token.NoPos
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}
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// TestCHA runs CHA on each file in inputs, prints the dynamic edges of
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// the call graph, and compares it with the golden results embedded in
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// the WANT comment at the end of the file.
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//
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func TestCHA(t *testing.T) {
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for _, filename := range inputs {
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content, err := ioutil.ReadFile(filename)
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if err != nil {
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t.Errorf("couldn't read file '%s': %s", filename, err)
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continue
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}
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conf := loader.Config{
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ParserMode: parser.ParseComments,
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}
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f, err := conf.ParseFile(filename, content)
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if err != nil {
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t.Error(err)
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continue
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}
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want, pos := expectation(f)
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if pos == token.NoPos {
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t.Errorf("No WANT: comment in %s", filename)
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continue
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}
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conf.CreateFromFiles("main", f)
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iprog, err := conf.Load()
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if err != nil {
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t.Error(err)
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continue
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}
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prog := ssautil.CreateProgram(iprog, 0)
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mainPkg := prog.Package(iprog.Created[0].Pkg)
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prog.Build()
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cg := cha.CallGraph(prog)
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if got := printGraph(cg, mainPkg.Pkg); got != want {
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t.Errorf("%s: got:\n%s\nwant:\n%s",
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prog.Fset.Position(pos), got, want)
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}
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}
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}
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func printGraph(cg *callgraph.Graph, from *types.Package) string {
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var edges []string
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callgraph.GraphVisitEdges(cg, func(e *callgraph.Edge) error {
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if strings.Contains(e.Description(), "dynamic") {
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edges = append(edges, fmt.Sprintf("%s --> %s",
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e.Caller.Func.RelString(from),
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e.Callee.Func.RelString(from)))
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}
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return nil
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})
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sort.Strings(edges)
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var buf bytes.Buffer
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buf.WriteString("Dynamic calls\n")
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for _, edge := range edges {
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fmt.Fprintf(&buf, " %s\n", edge)
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}
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return strings.TrimSpace(buf.String())
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}
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