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// Copyright 2013 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 loader_test
// This file enumerates all packages beneath $GOROOT, loads them, plus
// their external tests if any, runs the type checker on them, and
// prints some summary information.
import (
"bytes"
"fmt"
"go/ast"
"go/build"
"go/token"
"go/types"
"io/ioutil"
"path/filepath"
"runtime"
"strings"
"testing"
"time"
"golang.org/x/tools/go/buildutil"
"golang.org/x/tools/go/loader"
"golang.org/x/tools/internal/testenv"
)
func TestStdlib(t *testing.T) {
if runtime.GOOS == "android" {
t.Skipf("incomplete std lib on %s", runtime.GOOS)
}
if testing.Short() {
t.Skip("skipping in short mode; uses tons of memory (https://golang.org/issue/14113)")
}
testenv.NeedsTool(t, "go")
runtime.GC()
t0 := time.Now()
var memstats runtime.MemStats
runtime.ReadMemStats(&memstats)
alloc := memstats.Alloc
// Load, parse and type-check the program.
ctxt := build.Default // copy
ctxt.GOPATH = "" // disable GOPATH
conf := loader.Config{Build: &ctxt}
for _, path := range buildutil.AllPackages(conf.Build) {
conf.ImportWithTests(path)
}
prog, err := conf.Load()
if err != nil {
t.Fatalf("Load failed: %v", err)
}
t1 := time.Now()
runtime.GC()
runtime.ReadMemStats(&memstats)
numPkgs := len(prog.AllPackages)
if want := 205; numPkgs < want {
t.Errorf("Loaded only %d packages, want at least %d", numPkgs, want)
}
// Dump package members.
if false {
for pkg := range prog.AllPackages {
fmt.Printf("Package %s:\n", pkg.Path())
scope := pkg.Scope()
qualifier := types.RelativeTo(pkg)
for _, name := range scope.Names() {
if ast.IsExported(name) {
fmt.Printf("\t%s\n", types.ObjectString(scope.Lookup(name), qualifier))
}
}
fmt.Println()
}
}
// Check that Test functions for regexp and compress/bzip2 are
// simultaneously present. The apparent cycle formed when augmenting
// these packages by their tests (together with io/ioutil's test, which is now
// an xtest) was the original motivation or reporting golang.org/issue/7114.
//
// compress/bzip2.TestBitReader in bzip2_test.go imports io/ioutil
// io/ioutil.TestTempFile in tempfile_test.go imports regexp (no longer exists)
// regexp.TestRE2Search in exec_test.go imports compress/bzip2
for _, test := range []struct{ pkg, fn string }{
{"regexp", "TestRE2Search"},
{"compress/bzip2", "TestBitReader"},
} {
info := prog.Imported[test.pkg]
if info == nil {
t.Errorf("failed to load package %q", test.pkg)
continue
}
obj, _ := info.Pkg.Scope().Lookup(test.fn).(*types.Func)
if obj == nil {
t.Errorf("package %q has no func %q", test.pkg, test.fn)
continue
}
}
// Dump some statistics.
// determine line count
var lineCount int
prog.Fset.Iterate(func(f *token.File) bool {
lineCount += f.LineCount()
return true
})
t.Log("GOMAXPROCS: ", runtime.GOMAXPROCS(0))
t.Log("#Source lines: ", lineCount)
t.Log("Load/parse/typecheck: ", t1.Sub(t0))
t.Log("#MB: ", int64(memstats.Alloc-alloc)/1000000)
}
func TestCgoOption(t *testing.T) {
if testing.Short() {
t.Skip("skipping in short mode; uses tons of memory (https://golang.org/issue/14113)")
}
switch runtime.GOOS {
// On these systems, the net and os/user packages don't use cgo
// or the std library is incomplete (Android).
case "android", "plan9", "solaris", "windows":
t.Skipf("no cgo or incomplete std lib on %s", runtime.GOOS)
case "darwin":
t.Skipf("golang/go#58493: file locations in this test are stale on darwin")
}
// In nocgo builds (e.g. linux-amd64-nocgo),
// there is no "runtime/cgo" package,
// so cgo-generated Go files will have a failing import.
if !build.Default.CgoEnabled {
return
}
testenv.NeedsTool(t, "go")
// Test that we can load cgo-using packages with
// CGO_ENABLED=[01], which causes go/build to select pure
// Go/native implementations, respectively, based on build
// tags.
//
// Each entry specifies a package-level object and the generic
// file expected to define it when cgo is disabled.
// When cgo is enabled, the exact file is not specified (since
// it varies by platform), but must differ from the generic one.
//
// The test also loads the actual file to verify that the
// object is indeed defined at that location.
for _, test := range []struct {
pkg, name, genericFile string
}{
{"net", "cgoLookupHost", "cgo_stub.go"},
{"os/user", "current", "lookup_stubs.go"},
} {
ctxt := build.Default
for _, ctxt.CgoEnabled = range []bool{false, true} {
conf := loader.Config{Build: &ctxt}
conf.Import(test.pkg)
prog, err := conf.Load()
if err != nil {
t.Errorf("Load failed: %v", err)
continue
}
info := prog.Imported[test.pkg]
if info == nil {
t.Errorf("package %s not found", test.pkg)
continue
}
obj := info.Pkg.Scope().Lookup(test.name)
if obj == nil {
t.Errorf("no object %s.%s", test.pkg, test.name)
continue
}
posn := prog.Fset.Position(obj.Pos())
t.Logf("%s: %s (CgoEnabled=%t)", posn, obj, ctxt.CgoEnabled)
gotFile := filepath.Base(posn.Filename)
filesMatch := gotFile == test.genericFile
if ctxt.CgoEnabled && filesMatch {
t.Errorf("CGO_ENABLED=1: %s found in %s, want native file",
obj, gotFile)
} else if !ctxt.CgoEnabled && !filesMatch {
t.Errorf("CGO_ENABLED=0: %s found in %s, want %s",
obj, gotFile, test.genericFile)
}
// Load the file and check the object is declared at the right place.
b, err := ioutil.ReadFile(posn.Filename)
if err != nil {
t.Errorf("can't read %s: %s", posn.Filename, err)
continue
}
line := string(bytes.Split(b, []byte("\n"))[posn.Line-1])
ident := line[posn.Column-1:]
if !strings.HasPrefix(ident, test.name) {
t.Errorf("%s: %s not declared here (looking at %q)", posn, obj, ident)
}
}
}
}
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