go/types, go/gcimporter: backport changes from std repo

This is a 1:1 backport of the following changes:

https://go-review.googlesource.com/8611
https://go-review.googlesource.com/8621

Change-Id: I4a75d73cb99a7d104d32553f5530408c2b6d81b8
Reviewed-on: https://go-review.googlesource.com/8629
Reviewed-by: Alan Donovan <adonovan@google.com>

go/gcimporter/gcimporter.go

@@ -30,7 +30,7 @@ func init() {
 	types.DefaultImport = Import
 }
 
-var pkgExts = [...]string{".a", ".5", ".6", ".8"}
+var pkgExts = [...]string{".a", ".5", ".6", ".7", ".8", ".9"}
 
 // FindPkg returns the filename and unique package id for an import
 // path based on package information provided by build.Import (using

go/gcimporter/gcimporter_test.go

@@ -18,23 +18,27 @@ import (
 	"golang.org/x/tools/go/types"
 )
 
+// skipSpecialPlatforms causes the test to be skipped for platforms where
+// builders (build.golang.org) don't have access to compiled packages for
+// import.
+func skipSpecialPlatforms(t *testing.T) {
+	switch platform := runtime.GOOS + "-" + runtime.GOARCH; platform {
+	case "nacl-amd64p32",
+		"nacl-386",
+		"darwin-arm",
+		"darwin-arm64":
+		t.Skipf("no compiled packages available for import on %s", platform)
+	}
+}
+
 var gcPath string // Go compiler path
 
 func init() {
-	// determine compiler
-	var gc string
-	switch runtime.GOARCH {
-	case "386":
-		gc = "8g"
-	case "amd64":
-		gc = "6g"
-	case "arm":
-		gc = "5g"
-	default:
-		gcPath = "unknown-GOARCH-compiler"
+	if char, err := build.ArchChar(runtime.GOARCH); err == nil {
+		gcPath = filepath.Join(build.ToolDir, char+"g")
 		return
 	}
-	gcPath = filepath.Join(build.ToolDir, gc)
+	gcPath = "unknown-GOARCH-compiler"
 }
 
 func compile(t *testing.T, dirname, filename string) string {
@@ -97,8 +101,9 @@ func testDir(t *testing.T, dir string, endTime time.Time) (nimports int) {
 }
 
 func TestImport(t *testing.T) {
-	// This package does not handle gccgo export data.
-	if runtime.Compiler == "gccgo" {
+	// This package only handles gc export data.
+	if runtime.Compiler != "gc" {
+		t.Skipf("gc-built packages not available (compiler = %s)", runtime.Compiler)
 		return
 	}
 
@@ -133,10 +138,14 @@ var importedObjectTests = []struct {
 }
 
 func TestImportedTypes(t *testing.T) {
-	// This package does not handle gccgo export data.
-	if runtime.Compiler == "gccgo" {
+	skipSpecialPlatforms(t)
+
+	// This package only handles gc export data.
+	if runtime.Compiler != "gc" {
+		t.Skipf("gc-built packages not available (compiler = %s)", runtime.Compiler)
 		return
 	}
+
 	for _, test := range importedObjectTests {
 		s := strings.Split(test.name, ".")
 		if len(s) != 2 {
@@ -165,8 +174,11 @@ func TestImportedTypes(t *testing.T) {
 }
 
 func TestIssue5815(t *testing.T) {
-	// This package does not handle gccgo export data.
-	if runtime.Compiler == "gccgo" {
+	skipSpecialPlatforms(t)
+
+	// This package only handles gc export data.
+	if runtime.Compiler != "gc" {
+		t.Skipf("gc-built packages not available (compiler = %s)", runtime.Compiler)
 		return
 	}
 
@@ -195,8 +207,11 @@ func TestIssue5815(t *testing.T) {
 
 // Smoke test to ensure that imported methods get the correct package.
 func TestCorrectMethodPackage(t *testing.T) {
-	// This package does not handle gccgo export data.
-	if runtime.Compiler == "gccgo" {
+	skipSpecialPlatforms(t)
+
+	// This package only handles gc export data.
+	if runtime.Compiler != "gc" {
+		t.Skipf("gc-built packages not available (compiler = %s)", runtime.Compiler)
 		return
 	}
 

go/types/api_test.go

@@ -10,6 +10,7 @@ import (
 	"go/ast"
 	"go/parser"
 	"go/token"
+	"runtime"
 	"strings"
 	"testing"
 
@@ -17,6 +18,19 @@ import (
 	. "golang.org/x/tools/go/types"
 )
 
+// skipSpecialPlatforms causes the test to be skipped for platforms where
+// builders (build.golang.org) don't have access to compiled packages for
+// import.
+func skipSpecialPlatforms(t *testing.T) {
+	switch platform := runtime.GOOS + "-" + runtime.GOARCH; platform {
+	case "nacl-amd64p32",
+		"nacl-386",
+		"darwin-arm",
+		"darwin-arm64":
+		t.Skipf("no compiled packages available for import on %s", platform)
+	}
+}
+
 func pkgFor(path, source string, info *Info) (*Package, error) {
 	fset := token.NewFileSet()
 	f, err := parser.ParseFile(fset, path, source, 0)
@@ -284,6 +298,8 @@ func predString(tv TypeAndValue) string {
 }
 
 func TestPredicatesInfo(t *testing.T) {
+	skipSpecialPlatforms(t)
+
 	var tests = []struct {
 		src  string
 		expr string
@@ -368,6 +384,8 @@ func TestPredicatesInfo(t *testing.T) {
 }
 
 func TestScopesInfo(t *testing.T) {
+	skipSpecialPlatforms(t)
+
 	var tests = []struct {
 		src    string
 		scopes []string // list of scope descriptors of the form kind:varlist

go/types/check_test.go

@@ -278,6 +278,8 @@ func checkFiles(t *testing.T, testfiles []string) {
 }
 
 func TestCheck(t *testing.T) {
+	skipSpecialPlatforms(t)
+
 	// Declare builtins for testing.
 	DefPredeclaredTestFuncs()
 

go/types/eval_test.go

@@ -83,6 +83,8 @@ func TestEvalArith(t *testing.T) {
 }
 
 func TestEvalContext(t *testing.T) {
+	skipSpecialPlatforms(t)
+
 	src := `
 package p
 import "fmt"

go/types/resolver_test.go

@@ -89,6 +89,8 @@ var pkgnames = []string{
 }
 
 func TestResolveIdents(t *testing.T) {
+	skipSpecialPlatforms(t)
+
 	// parse package files
 	fset := token.NewFileSet()
 	var files []*ast.File

go/types/stdlib_test.go

@@ -32,6 +32,8 @@ var (
 )
 
 func TestStdlib(t *testing.T) {
+	skipSpecialPlatforms(t)
+
 	walkDirs(t, filepath.Join(runtime.GOROOT(), "src"))
 	if testing.Verbose() {
 		fmt.Println(pkgCount, "packages typechecked in", time.Since(start))
@@ -116,6 +118,14 @@ func testTestDir(t *testing.T, path string, ignore ...string) {
 }
 
 func TestStdTest(t *testing.T) {
+	skipSpecialPlatforms(t)
+
+	// test/recover4.go is only built for Linux and Darwin.
+	// TODO(gri) Remove once tests consider +build tags (issue 10370).
+	if runtime.GOOS != "linux" || runtime.GOOS != "darwin" {
+		return
+	}
+
 	testTestDir(t, filepath.Join(runtime.GOROOT(), "test"),
 		"cmplxdivide.go", // also needs file cmplxdivide1.go - ignore
 		"sigchld.go",     // don't work on Windows; testTestDir should consult build tags
@@ -123,6 +133,8 @@ func TestStdTest(t *testing.T) {
 }
 
 func TestStdFixed(t *testing.T) {
+	skipSpecialPlatforms(t)
+
 	testTestDir(t, filepath.Join(runtime.GOROOT(), "test", "fixedbugs"),
 		"bug248.go", "bug302.go", "bug369.go", // complex test instructions - ignore
 		"bug459.go",    // possibly incorrect test - see issue 6703 (pending spec clarification)
@@ -132,6 +144,8 @@ func TestStdFixed(t *testing.T) {
 }
 
 func TestStdKen(t *testing.T) {
+	skipSpecialPlatforms(t)
+
 	testTestDir(t, filepath.Join(runtime.GOROOT(), "test", "ken"))
 }
 

go/types/typestring_test.go

@@ -116,6 +116,8 @@ var dependentTestTypes = []testEntry{
 }
 
 func TestTypeString(t *testing.T) {
+	skipSpecialPlatforms(t)
+
 	var tests []testEntry
 	tests = append(tests, independentTestTypes...)
 	tests = append(tests, dependentTestTypes...)