--- /dev/null
+// Copyright 2018 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 packages_test
+
+import (
+ "bytes"
+ "io/ioutil"
+ "path/filepath"
+ "runtime"
+ "strings"
+ "testing"
+ "time"
+
+ "golang.org/x/tools/go/packages"
+ "golang.org/x/tools/internal/testenv"
+)
+
+// This test loads the metadata for the standard library,
+func TestStdlibMetadata(t *testing.T) {
+ // TODO(adonovan): see if we can get away without this hack.
+ // if runtime.GOOS == "android" {
+ // t.Skipf("incomplete std lib on %s", runtime.GOOS)
+ // }
+
+ testenv.NeedsGoPackages(t)
+
+ runtime.GC()
+ t0 := time.Now()
+ var memstats runtime.MemStats
+ runtime.ReadMemStats(&memstats)
+ alloc := memstats.Alloc
+
+ // Load, parse and type-check the program.
+ cfg := &packages.Config{Mode: packages.LoadAllSyntax}
+ pkgs, err := packages.Load(cfg, "std")
+ if err != nil {
+ t.Fatalf("failed to load metadata: %v", err)
+ }
+ if packages.PrintErrors(pkgs) > 0 {
+ t.Fatal("there were errors loading standard library")
+ }
+
+ t1 := time.Now()
+ runtime.GC()
+ runtime.ReadMemStats(&memstats)
+ runtime.KeepAlive(pkgs)
+
+ t.Logf("Loaded %d packages", len(pkgs))
+ numPkgs := len(pkgs)
+
+ want := 150 // 186 on linux, 185 on windows.
+ if numPkgs < want {
+ t.Errorf("Loaded only %d packages, want at least %d", numPkgs, want)
+ }
+
+ t.Log("GOMAXPROCS: ", runtime.GOMAXPROCS(0))
+ t.Log("Metadata: ", t1.Sub(t0)) // ~800ms on 12 threads
+ t.Log("#MB: ", int64(memstats.Alloc-alloc)/1000000) // ~1MB
+}
+
+func TestCgoOption(t *testing.T) {
+ if testing.Short() {
+ t.Skip("skipping in short mode; uses tons of memory (https://golang.org/issue/14113)")
+ }
+
+ testenv.NeedsGoPackages(t)
+
+ // TODO(adonovan): see if we can get away without these old
+ // go/loader hacks now that we use the go list command.
+ //
+ // 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)
+ // }
+ // // 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
+ // }
+
+ // Test that we can load cgo-using packages with
+ // DisableCgo=true/false, which, among other things, causes go
+ // list 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, declKeyword, name, genericFile string
+ }{
+ {"net", "type", "addrinfoErrno", "cgo_stub.go"},
+ {"os/user", "func", "current", "lookup_stubs.go"},
+ } {
+ cfg := &packages.Config{Mode: packages.LoadSyntax}
+ pkgs, err := packages.Load(cfg, test.pkg)
+ if err != nil {
+ t.Errorf("Load failed: %v", err)
+ continue
+ }
+ if packages.PrintErrors(pkgs) > 0 {
+ t.Error("there were errors loading standard library")
+ continue
+ }
+ pkg := pkgs[0]
+ obj := pkg.Types.Scope().Lookup(test.name)
+ if obj == nil {
+ t.Errorf("no object %s.%s", test.pkg, test.name)
+ continue
+ }
+ posn := pkg.Fset.Position(obj.Pos())
+ gotFile := filepath.Base(posn.Filename)
+ filesMatch := gotFile == test.genericFile
+
+ if filesMatch {
+ t.Errorf("!DisableCgo: %s found in %s, want native file",
+ obj, gotFile)
+ }
+
+ // 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])
+ // Don't assume posn.Column is accurate.
+ if !strings.Contains(line, test.declKeyword+" "+test.name) {
+ t.Errorf("%s: %s not declared here (looking at %q)", posn, obj, line)
+ }
+ }
+}