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// 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.
package ssautil_test
import (
"bytes"
"go/ast"
"go/importer"
"go/parser"
"go/token"
"go/types"
"os"
"path"
"strings"
"testing"
"golang.org/x/tools/go/packages"
"golang.org/x/tools/go/packages/packagestest"
"golang.org/x/tools/go/ssa"
"golang.org/x/tools/go/ssa/ssautil"
"golang.org/x/tools/internal/testenv"
)
const hello = `package main
import "fmt"
func main() {
fmt.Println("Hello, world")
}
`
func TestBuildPackage(t *testing.T) {
testenv.NeedsGoBuild(t) // for importer.Default()
// There is a more substantial test of BuildPackage and the
// SSA program it builds in ../ssa/builder_test.go.
fset := token.NewFileSet()
f, err := parser.ParseFile(fset, "hello.go", hello, 0)
if err != nil {
t.Fatal(err)
}
for _, mode := range []ssa.BuilderMode{
ssa.SanityCheckFunctions,
ssa.InstantiateGenerics | ssa.SanityCheckFunctions,
} {
pkg := types.NewPackage("hello", "")
ssapkg, _, err := ssautil.BuildPackage(&types.Config{Importer: importer.Default()}, fset, pkg, []*ast.File{f}, mode)
if err != nil {
t.Fatal(err)
}
if pkg.Name() != "main" {
t.Errorf("pkg.Name() = %s, want main", pkg.Name())
}
if ssapkg.Func("main") == nil {
ssapkg.WriteTo(os.Stderr)
t.Errorf("ssapkg has no main function")
}
}
}
func TestPackages(t *testing.T) {
testenv.NeedsGoPackages(t)
cfg := &packages.Config{Mode: packages.LoadSyntax}
initial, err := packages.Load(cfg, "bytes")
if err != nil {
t.Fatal(err)
}
if packages.PrintErrors(initial) > 0 {
t.Fatal("there were errors")
}
for _, mode := range []ssa.BuilderMode{
ssa.SanityCheckFunctions,
ssa.SanityCheckFunctions | ssa.InstantiateGenerics,
} {
prog, pkgs := ssautil.Packages(initial, mode)
bytesNewBuffer := pkgs[0].Func("NewBuffer")
bytesNewBuffer.Pkg.Build()
// We'll dump the SSA of bytes.NewBuffer because it is small and stable.
out := new(bytes.Buffer)
bytesNewBuffer.WriteTo(out)
// For determinism, sanitize the location.
location := prog.Fset.Position(bytesNewBuffer.Pos()).String()
got := strings.Replace(out.String(), location, "$GOROOT/src/bytes/buffer.go:1", -1)
want := `
# Name: bytes.NewBuffer
# Package: bytes
# Location: $GOROOT/src/bytes/buffer.go:1
func NewBuffer(buf []byte) *Buffer:
0: entry P:0 S:0
t0 = new Buffer (complit) *Buffer
t1 = &t0.buf [#0] *[]byte
*t1 = buf
return t0
`[1:]
if got != want {
t.Errorf("bytes.NewBuffer SSA = <<%s>>, want <<%s>>", got, want)
}
}
}
func TestBuildPackage_MissingImport(t *testing.T) {
fset := token.NewFileSet()
f, err := parser.ParseFile(fset, "bad.go", `package bad; import "missing"`, 0)
if err != nil {
t.Fatal(err)
}
pkg := types.NewPackage("bad", "")
ssapkg, _, err := ssautil.BuildPackage(new(types.Config), fset, pkg, []*ast.File{f}, ssa.BuilderMode(0))
if err == nil || ssapkg != nil {
t.Fatal("BuildPackage succeeded unexpectedly")
}
}
func TestIssue28106(t *testing.T) {
testenv.NeedsGoPackages(t)
// In go1.10, go/packages loads all packages from source, not
// export data, but does not type check function bodies of
// imported packages. This test ensures that we do not attempt
// to run the SSA builder on functions without type information.
cfg := &packages.Config{Mode: packages.LoadSyntax}
pkgs, err := packages.Load(cfg, "runtime")
if err != nil {
t.Fatal(err)
}
prog, _ := ssautil.Packages(pkgs, ssa.BuilderMode(0))
prog.Build() // no crash
}
func TestIssue53604(t *testing.T) {
// Tests that variable initializers are not added to init() when syntax
// is not present but types.Info is available.
//
// Packages x, y, z are loaded with mode `packages.LoadSyntax`.
// Package x imports y, and y imports z.
// Packages are built using ssautil.Packages() with x and z as roots.
// This setup creates y using CreatePackage(pkg, files, info, ...)
// where len(files) == 0 but info != nil.
//
// Tests that globals from y are not initialized.
e := packagestest.Export(t, packagestest.Modules, []packagestest.Module{
{
Name: "golang.org/fake",
Files: map[string]interface{}{
"x/x.go": `package x; import "golang.org/fake/y"; var V = y.F()`,
"y/y.go": `package y; import "golang.org/fake/z"; var F = func () *int { return &z.Z } `,
"z/z.go": `package z; var Z int`,
},
},
})
defer e.Cleanup()
// Load x and z as entry packages using packages.LoadSyntax
e.Config.Mode = packages.LoadSyntax
pkgs, err := packages.Load(e.Config, path.Join(e.Temp(), "fake/x"), path.Join(e.Temp(), "fake/z"))
if err != nil {
t.Fatal(err)
}
for _, p := range pkgs {
if len(p.Errors) > 0 {
t.Fatalf("%v", p.Errors)
}
}
prog, _ := ssautil.Packages(pkgs, ssa.BuilderMode(0))
prog.Build()
// y does not initialize F.
y := prog.ImportedPackage("golang.org/fake/y")
if y == nil {
t.Fatal("Failed to load intermediate package y")
}
yinit := y.Members["init"].(*ssa.Function)
for _, bb := range yinit.Blocks {
for _, i := range bb.Instrs {
if store, ok := i.(*ssa.Store); ok && store.Addr == y.Var("F") {
t.Errorf("y.init() stores to F %v", store)
}
}
}
}
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