libgo: Update to weekly.2012-03-13.

From-SVN: r186023

libgo/MERGE

-f4470a54e6db
+3cdba7b0650c
 
 The first line of this file holds the Mercurial revision number of the
 last merge done from the master library sources.

libgo/Makefile.am

@@ -813,6 +813,7 @@ go_net_rpc_files = \
 	go/net/rpc/server.go
 
 go_runtime_files = \
+	go/runtime/compiler.go \
 	go/runtime/debug.go \
 	go/runtime/error.go \
 	go/runtime/extern.go \
@@ -843,6 +844,7 @@ go_strconv_files = \
 	go/strconv/decimal.go \
 	go/strconv/extfloat.go \
 	go/strconv/ftoa.go \
+	go/strconv/isprint.go \
 	go/strconv/itoa.go \
 	go/strconv/quote.go
 
@@ -1000,12 +1002,13 @@ go_crypto_tls_files = \
 	go/crypto/tls/handshake_server.go \
 	go/crypto/tls/key_agreement.go \
 	go/crypto/tls/prf.go \
-	go/crypto/tls/root_unix.go \
 	go/crypto/tls/tls.go
 go_crypto_x509_files = \
 	go/crypto/x509/cert_pool.go \
 	go/crypto/x509/pkcs1.go \
 	go/crypto/x509/pkcs8.go \
+	go/crypto/x509/root.go \
+	go/crypto/x509/root_unix.go \
 	go/crypto/x509/verify.go \
 	go/crypto/x509/x509.go
 
@@ -1320,7 +1323,8 @@ go_os_user_files = \
 go_path_filepath_files = \
 	go/path/filepath/match.go \
 	go/path/filepath/path.go \
-	go/path/filepath/path_unix.go
+	go/path/filepath/path_unix.go \
+	go/path/filepath/symlink.go
 
 go_regexp_syntax_files = \
 	go/regexp/syntax/compile.go \

libgo/Makefile.in

@@ -1131,6 +1131,7 @@ go_net_rpc_files = \
 	go/net/rpc/server.go
 
 go_runtime_files = \
+	go/runtime/compiler.go \
 	go/runtime/debug.go \
 	go/runtime/error.go \
 	go/runtime/extern.go \
@@ -1150,6 +1151,7 @@ go_strconv_files = \
 	go/strconv/decimal.go \
 	go/strconv/extfloat.go \
 	go/strconv/ftoa.go \
+	go/strconv/isprint.go \
 	go/strconv/itoa.go \
 	go/strconv/quote.go
 
@@ -1315,13 +1317,14 @@ go_crypto_tls_files = \
 	go/crypto/tls/handshake_server.go \
 	go/crypto/tls/key_agreement.go \
 	go/crypto/tls/prf.go \
-	go/crypto/tls/root_unix.go \
 	go/crypto/tls/tls.go
 
 go_crypto_x509_files = \
 	go/crypto/x509/cert_pool.go \
 	go/crypto/x509/pkcs1.go \
 	go/crypto/x509/pkcs8.go \
+	go/crypto/x509/root.go \
+	go/crypto/x509/root_unix.go \
 	go/crypto/x509/verify.go \
 	go/crypto/x509/x509.go
 
@@ -1677,7 +1680,8 @@ go_os_user_files = \
 go_path_filepath_files = \
 	go/path/filepath/match.go \
 	go/path/filepath/path.go \
-	go/path/filepath/path_unix.go
+	go/path/filepath/path_unix.go \
+	go/path/filepath/symlink.go
 
 go_regexp_syntax_files = \
 	go/regexp/syntax/compile.go \

libgo/go/archive/tar/reader.go

@@ -18,7 +18,7 @@ import (
 )
 
 var (
-	ErrHeader = errors.New("invalid tar header")
+	ErrHeader = errors.New("archive/tar: invalid tar header")
 )
 
 // A Reader provides sequential access to the contents of a tar archive.

libgo/go/archive/tar/writer.go

@@ -5,18 +5,19 @@
 package tar
 
 // TODO(dsymonds):
-// - catch more errors (no first header, write after close, etc.)
+// - catch more errors (no first header, etc.)
 
 import (
 	"errors"
+	"fmt"
 	"io"
 	"strconv"
 )
 
 var (
-	ErrWriteTooLong    = errors.New("write too long")
-	ErrFieldTooLong    = errors.New("header field too long")
-	ErrWriteAfterClose = errors.New("write after close")
+	ErrWriteTooLong    = errors.New("archive/tar: write too long")
+	ErrFieldTooLong    = errors.New("archive/tar: header field too long")
+	ErrWriteAfterClose = errors.New("archive/tar: write after close")
 )
 
 // A Writer provides sequential writing of a tar archive in POSIX.1 format.
@@ -48,6 +49,11 @@ func NewWriter(w io.Writer) *Writer { return &Writer{w: w} }
 
 // Flush finishes writing the current file (optional).
 func (tw *Writer) Flush() error {
+	if tw.nb > 0 {
+		tw.err = fmt.Errorf("archive/tar: missed writing %d bytes", tw.nb)
+		return tw.err
+	}
+
 	n := tw.nb + tw.pad
 	for n > 0 && tw.err == nil {
 		nr := n
@@ -193,6 +199,9 @@ func (tw *Writer) Close() error {
 	}
 	tw.Flush()
 	tw.closed = true
+	if tw.err != nil {
+		return tw.err
+	}
 
 	// trailer: two zero blocks
 	for i := 0; i < 2; i++ {

libgo/go/archive/tar/writer_test.go

@@ -9,6 +9,7 @@ import (
 	"fmt"
 	"io"
 	"io/ioutil"
+	"strings"
 	"testing"
 	"testing/iotest"
 	"time"
@@ -95,7 +96,8 @@ var writerTests = []*writerTest{
 					Uname:    "dsymonds",
 					Gname:    "eng",
 				},
-				// no contents
+				// fake contents
+				contents: strings.Repeat("\x00", 4<<10),
 			},
 		},
 	},
@@ -150,7 +152,9 @@ testLoop:
 
 		buf := new(bytes.Buffer)
 		tw := NewWriter(iotest.TruncateWriter(buf, 4<<10)) // only catch the first 4 KB
+		big := false
 		for j, entry := range test.entries {
+			big = big || entry.header.Size > 1<<10
 			if err := tw.WriteHeader(entry.header); err != nil {
 				t.Errorf("test %d, entry %d: Failed writing header: %v", i, j, err)
 				continue testLoop
@@ -160,7 +164,8 @@ testLoop:
 				continue testLoop
 			}
 		}
-		if err := tw.Close(); err != nil {
+		// Only interested in Close failures for the small tests.
+		if err := tw.Close(); err != nil && !big {
 			t.Errorf("test %d: Failed closing archive: %v", i, err)
 			continue testLoop
 		}

libgo/go/archive/zip/reader.go

@@ -124,10 +124,6 @@ func (f *File) Open() (rc io.ReadCloser, err error) {
 		return
 	}
 	size := int64(f.CompressedSize)
-	if size == 0 && f.hasDataDescriptor() {
-		// permit SectionReader to see the rest of the file
-		size = f.zipsize - (f.headerOffset + bodyOffset)
-	}
 	r := io.NewSectionReader(f.zipr, f.headerOffset+bodyOffset, size)
 	switch f.Method {
 	case Store: // (no compression)
@@ -136,10 +132,13 @@ func (f *File) Open() (rc io.ReadCloser, err error) {
 		rc = flate.NewReader(r)
 	default:
 		err = ErrAlgorithm
+		return
 	}
-	if rc != nil {
-		rc = &checksumReader{rc, crc32.NewIEEE(), f, r}
+	var desr io.Reader
+	if f.hasDataDescriptor() {
+		desr = io.NewSectionReader(f.zipr, f.headerOffset+bodyOffset+size, dataDescriptorLen)
 	}
+	rc = &checksumReader{rc, crc32.NewIEEE(), f, desr, nil}
 	return
 }
 
@@ -147,23 +146,36 @@ type checksumReader struct {
 	rc   io.ReadCloser
 	hash hash.Hash32
 	f    *File
-	zipr io.Reader // for reading the data descriptor
+	desr io.Reader // if non-nil, where to read the data descriptor
+	err  error     // sticky error
 }
 
 func (r *checksumReader) Read(b []byte) (n int, err error) {
+	if r.err != nil {
+		return 0, r.err
+	}
 	n, err = r.rc.Read(b)
 	r.hash.Write(b[:n])
-	if err != io.EOF {
+	if err == nil {
 		return
 	}
-	if r.f.hasDataDescriptor() {
-		if err = readDataDescriptor(r.zipr, r.f); err != nil {
-			return
+	if err == io.EOF {
+		if r.desr != nil {
+			if err1 := readDataDescriptor(r.desr, r.f); err1 != nil {
+				err = err1
+			} else if r.hash.Sum32() != r.f.CRC32 {
+				err = ErrChecksum
+			}
+		} else {
+			// If there's not a data descriptor, we still compare
+			// the CRC32 of what we've read against the file header
+			// or TOC's CRC32, if it seems like it was set.
+			if r.f.CRC32 != 0 && r.hash.Sum32() != r.f.CRC32 {
+				err = ErrChecksum
+			}
 		}
 	}
-	if r.hash.Sum32() != r.f.CRC32 {
-		err = ErrChecksum
-	}
+	r.err = err
 	return
 }
 
@@ -226,10 +238,31 @@ func readDirectoryHeader(f *File, r io.Reader) error {
 
 func readDataDescriptor(r io.Reader, f *File) error {
 	var buf [dataDescriptorLen]byte
-	if _, err := io.ReadFull(r, buf[:]); err != nil {
+
+	// The spec says: "Although not originally assigned a
+	// signature, the value 0x08074b50 has commonly been adopted
+	// as a signature value for the data descriptor record.
+	// Implementers should be aware that ZIP files may be
+	// encountered with or without this signature marking data
+	// descriptors and should account for either case when reading
+	// ZIP files to ensure compatibility."
+	//
+	// dataDescriptorLen includes the size of the signature but
+	// first read just those 4 bytes to see if it exists.
+	if _, err := io.ReadFull(r, buf[:4]); err != nil {
 		return err
 	}
-	b := readBuf(buf[:])
+	off := 0
+	maybeSig := readBuf(buf[:4])
+	if maybeSig.uint32() != dataDescriptorSignature {
+		// No data descriptor signature. Keep these four
+		// bytes.
+		off += 4
+	}
+	if _, err := io.ReadFull(r, buf[off:12]); err != nil {
+		return err
+	}
+	b := readBuf(buf[:12])
 	f.CRC32 = b.uint32()
 	f.CompressedSize = b.uint32()
 	f.UncompressedSize = b.uint32()

libgo/go/archive/zip/reader_test.go

@@ -10,23 +10,26 @@ import (
 	"io"
 	"io/ioutil"
 	"os"
+	"path/filepath"
 	"testing"
 	"time"
 )
 
 type ZipTest struct {
 	Name    string
+	Source  func() (r io.ReaderAt, size int64) // if non-nil, used instead of testdata/<Name> file
 	Comment string
 	File    []ZipTestFile
 	Error   error // the error that Opening this file should return
 }
 
 type ZipTestFile struct {
-	Name    string
-	Content []byte // if blank, will attempt to compare against File
-	File    string // name of file to compare to (relative to testdata/)
-	Mtime   string // modified time in format "mm-dd-yy hh:mm:ss"
-	Mode    os.FileMode
+	Name       string
+	Content    []byte // if blank, will attempt to compare against File
+	ContentErr error
+	File       string // name of file to compare to (relative to testdata/)
+	Mtime      string // modified time in format "mm-dd-yy hh:mm:ss"
+	Mode       os.FileMode
 }
 
 // Caution: The Mtime values found for the test files should correspond to
@@ -107,6 +110,99 @@ var tests = []ZipTest{
 		Name: "unix.zip",
 		File: crossPlatform,
 	},
+	{
+		// created by Go, before we wrote the "optional" data
+		// descriptor signatures (which are required by OS X)
+		Name: "go-no-datadesc-sig.zip",
+		File: []ZipTestFile{
+			{
+				Name:    "foo.txt",
+				Content: []byte("foo\n"),
+				Mtime:   "03-08-12 16:59:10",
+				Mode:    0644,
+			},
+			{
+				Name:    "bar.txt",
+				Content: []byte("bar\n"),
+				Mtime:   "03-08-12 16:59:12",
+				Mode:    0644,
+			},
+		},
+	},
+	{
+		// created by Go, after we wrote the "optional" data
+		// descriptor signatures (which are required by OS X)
+		Name: "go-with-datadesc-sig.zip",
+		File: []ZipTestFile{
+			{
+				Name:    "foo.txt",
+				Content: []byte("foo\n"),
+				Mode:    0666,
+			},
+			{
+				Name:    "bar.txt",
+				Content: []byte("bar\n"),
+				Mode:    0666,
+			},
+		},
+	},
+	{
+		Name:   "Bad-CRC32-in-data-descriptor",
+		Source: returnCorruptCRC32Zip,
+		File: []ZipTestFile{
+			{
+				Name:       "foo.txt",
+				Content:    []byte("foo\n"),
+				Mode:       0666,
+				ContentErr: ErrChecksum,
+			},
+			{
+				Name:    "bar.txt",
+				Content: []byte("bar\n"),
+				Mode:    0666,
+			},
+		},
+	},
+	// Tests that we verify (and accept valid) crc32s on files
+	// with crc32s in their file header (not in data descriptors)
+	{
+		Name: "crc32-not-streamed.zip",
+		File: []ZipTestFile{
+			{
+				Name:    "foo.txt",
+				Content: []byte("foo\n"),
+				Mtime:   "03-08-12 16:59:10",
+				Mode:    0644,
+			},
+			{
+				Name:    "bar.txt",
+				Content: []byte("bar\n"),
+				Mtime:   "03-08-12 16:59:12",
+				Mode:    0644,
+			},
+		},
+	},
+	// Tests that we verify (and reject invalid) crc32s on files
+	// with crc32s in their file header (not in data descriptors)
+	{
+		Name:   "crc32-not-streamed.zip",
+		Source: returnCorruptNotStreamedZip,
+		File: []ZipTestFile{
+			{
+				Name:       "foo.txt",
+				Content:    []byte("foo\n"),
+				Mtime:      "03-08-12 16:59:10",
+				Mode:       0644,
+				ContentErr: ErrChecksum,
+			},
+			{
+				Name:    "bar.txt",
+				Content: []byte("bar\n"),
+				Mtime:   "03-08-12 16:59:12",
+				Mode:    0644,
+			},
+		},
+	},
 }
 
 var crossPlatform = []ZipTestFile{
@@ -139,7 +235,18 @@ func TestReader(t *testing.T) {
 }
 
 func readTestZip(t *testing.T, zt ZipTest) {
-	z, err := OpenReader("testdata/" + zt.Name)
+	var z *Reader
+	var err error
+	if zt.Source != nil {
+		rat, size := zt.Source()
+		z, err = NewReader(rat, size)
+	} else {
+		var rc *ReadCloser
+		rc, err = OpenReader(filepath.Join("testdata", zt.Name))
+		if err == nil {
+			z = &rc.Reader
+		}
+	}
 	if err != zt.Error {
 		t.Errorf("error=%v, want %v", err, zt.Error)
 		return
@@ -149,11 +256,6 @@ func readTestZip(t *testing.T, zt ZipTest) {
 	if err == ErrFormat {
 		return
 	}
-	defer func() {
-		if err := z.Close(); err != nil {
-			t.Errorf("error %q when closing zip file", err)
-		}
-	}()
 
 	// bail here if no Files expected to be tested
 	// (there may actually be files in the zip, but we don't care)
@@ -170,7 +272,7 @@ func readTestZip(t *testing.T, zt ZipTest) {
 
 	// test read of each file
 	for i, ft := range zt.File {
-		readTestFile(t, ft, z.File[i])
+		readTestFile(t, zt, ft, z.File[i])
 	}
 
 	// test simultaneous reads
@@ -179,7 +281,7 @@ func readTestZip(t *testing.T, zt ZipTest) {
 	for i := 0; i < 5; i++ {
 		for j, ft := range zt.File {
 			go func(j int, ft ZipTestFile) {
-				readTestFile(t, ft, z.File[j])
+				readTestFile(t, zt, ft, z.File[j])
 				done <- true
 			}(j, ft)
 			n++
@@ -188,26 +290,11 @@ func readTestZip(t *testing.T, zt ZipTest) {
 	for ; n > 0; n-- {
 		<-done
 	}
-
-	// test invalid checksum
-	if !z.File[0].hasDataDescriptor() { // skip test when crc32 in dd
-		z.File[0].CRC32++ // invalidate
-		r, err := z.File[0].Open()
-		if err != nil {
-			t.Error(err)
-			return
-		}
-		var b bytes.Buffer
-		_, err = io.Copy(&b, r)
-		if err != ErrChecksum {
-			t.Errorf("%s: copy error=%v, want %v", z.File[0].Name, err, ErrChecksum)
-		}
-	}
 }
 
-func readTestFile(t *testing.T, ft ZipTestFile, f *File) {
+func readTestFile(t *testing.T, zt ZipTest, ft ZipTestFile, f *File) {
 	if f.Name != ft.Name {
-		t.Errorf("name=%q, want %q", f.Name, ft.Name)
+		t.Errorf("%s: name=%q, want %q", zt.Name, f.Name, ft.Name)
 	}
 
 	if ft.Mtime != "" {
@@ -217,11 +304,11 @@ func readTestFile(t *testing.T, ft ZipTestFile, f *File) {
 			return
 		}
 		if ft := f.ModTime(); !ft.Equal(mtime) {
-			t.Errorf("%s: mtime=%s, want %s", f.Name, ft, mtime)
+			t.Errorf("%s: %s: mtime=%s, want %s", zt.Name, f.Name, ft, mtime)
 		}
 	}
 
-	testFileMode(t, f, ft.Mode)
+	testFileMode(t, zt.Name, f, ft.Mode)
 
 	size0 := f.UncompressedSize
 
@@ -237,8 +324,10 @@ func readTestFile(t *testing.T, ft ZipTestFile, f *File) {
 	}
 
 	_, err = io.Copy(&b, r)
+	if err != ft.ContentErr {
+		t.Errorf("%s: copying contents: %v (want %v)", zt.Name, err, ft.ContentErr)
+	}
 	if err != nil {
-		t.Error(err)
 		return
 	}
 	r.Close()
@@ -264,12 +353,12 @@ func readTestFile(t *testing.T, ft ZipTestFile, f *File) {
 	}
 }
 
-func testFileMode(t *testing.T, f *File, want os.FileMode) {
+func testFileMode(t *testing.T, zipName string, f *File, want os.FileMode) {
 	mode := f.Mode()
 	if want == 0 {
-		t.Errorf("%s mode: got %v, want none", f.Name, mode)
+		t.Errorf("%s: %s mode: got %v, want none", zipName, f.Name, mode)
 	} else if mode != want {
-		t.Errorf("%s mode: want %v, got %v", f.Name, want, mode)
+		t.Errorf("%s: %s mode: want %v, got %v", zipName, f.Name, want, mode)
 	}
 }
 
@@ -294,3 +383,35 @@ func TestInvalidFiles(t *testing.T) {
 		t.Errorf("sigs: error=%v, want %v", err, ErrFormat)
 	}
 }
+
+func messWith(fileName string, corrupter func(b []byte)) (r io.ReaderAt, size int64) {
+	data, err := ioutil.ReadFile(filepath.Join("testdata", fileName))
+	if err != nil {
+		panic("Error reading " + fileName + ": " + err.Error())
+	}
+	corrupter(data)
+	return bytes.NewReader(data), int64(len(data))
+}
+
+func returnCorruptCRC32Zip() (r io.ReaderAt, size int64) {
+	return messWith("go-with-datadesc-sig.zip", func(b []byte) {
+		// Corrupt one of the CRC32s in the data descriptor:
+		b[0x2d]++
+	})
+}
+
+func returnCorruptNotStreamedZip() (r io.ReaderAt, size int64) {
+	return messWith("crc32-not-streamed.zip", func(b []byte) {
+		// Corrupt foo.txt's final crc32 byte, in both
+		// the file header and TOC. (0x7e -> 0x7f)
+		b[0x11]++
+		b[0x9d]++
+
+		// TODO(bradfitz): add a new test that only corrupts
+		// one of these values, and verify that that's also an
+		// error. Currently, the reader code doesn't verify the
+		// fileheader and TOC's crc32 match if they're both
+		// non-zero and only the second line above, the TOC,
+		// is what matters.
+	})
+}

libgo/go/archive/zip/struct.go

@@ -27,10 +27,11 @@ const (
 	fileHeaderSignature      = 0x04034b50
 	directoryHeaderSignature = 0x02014b50
 	directoryEndSignature    = 0x06054b50
-	fileHeaderLen            = 30 // + filename + extra
-	directoryHeaderLen       = 46 // + filename + extra + comment
-	directoryEndLen          = 22 // + comment
-	dataDescriptorLen        = 12
+	dataDescriptorSignature  = 0x08074b50 // de-facto standard; required by OS X Finder
+	fileHeaderLen            = 30         // + filename + extra
+	directoryHeaderLen       = 46         // + filename + extra + comment
+	directoryEndLen          = 22         // + comment
+	dataDescriptorLen        = 16         // four uint32: descriptor signature, crc32, compressed size, size
 
 	// Constants for the first byte in CreatorVersion
 	creatorFAT    = 0

libgo/go/archive/zip/writer.go

@@ -224,6 +224,7 @@ func (w *fileWriter) close() error {
 	// write data descriptor
 	var buf [dataDescriptorLen]byte
 	b := writeBuf(buf[:])
+	b.uint32(dataDescriptorSignature) // de-facto standard, required by OS X
 	b.uint32(fh.CRC32)
 	b.uint32(fh.CompressedSize)
 	b.uint32(fh.UncompressedSize)

libgo/go/archive/zip/writer_test.go

@@ -108,7 +108,7 @@ func testReadFile(t *testing.T, f *File, wt *WriteTest) {
 	if f.Name != wt.Name {
 		t.Fatalf("File name: got %q, want %q", f.Name, wt.Name)
 	}
-	testFileMode(t, f, wt.Mode)
+	testFileMode(t, wt.Name, f, wt.Mode)
 	rc, err := f.Open()
 	if err != nil {
 		t.Fatal("opening:", err)

libgo/go/crypto/tls/common.go

@@ -198,14 +198,6 @@ func (c *Config) time() time.Time {
 	return t()
 }
 
-func (c *Config) rootCAs() *x509.CertPool {
-	s := c.RootCAs
-	if s == nil {
-		s = defaultRoots()
-	}
-	return s
-}
-
 func (c *Config) cipherSuites() []uint16 {
 	s := c.CipherSuites
 	if s == nil {
@@ -311,28 +303,16 @@ func defaultConfig() *Config {
 	return &emptyConfig
 }
 
-var once sync.Once
-
-func defaultRoots() *x509.CertPool {
-	once.Do(initDefaults)
-	return varDefaultRoots
-}
+var (
+	once                   sync.Once
+	varDefaultCipherSuites []uint16
+)
 
 func defaultCipherSuites() []uint16 {
-	once.Do(initDefaults)
+	once.Do(initDefaultCipherSuites)
 	return varDefaultCipherSuites
 }
 
-func initDefaults() {
-	initDefaultRoots()
-	initDefaultCipherSuites()
-}
-
-var (
-	varDefaultRoots        *x509.CertPool
-	varDefaultCipherSuites []uint16
-)
-
 func initDefaultCipherSuites() {
 	varDefaultCipherSuites = make([]uint16, len(cipherSuites))
 	for i, suite := range cipherSuites {

libgo/go/crypto/tls/handshake_client.go

@@ -102,7 +102,7 @@ func (c *Conn) clientHandshake() error {
 
 	if !c.config.InsecureSkipVerify {
 		opts := x509.VerifyOptions{
-			Roots:         c.config.rootCAs(),
+			Roots:         c.config.RootCAs,
 			CurrentTime:   c.config.time(),
 			DNSName:       c.config.ServerName,
 			Intermediates: x509.NewCertPool(),

libgo/go/crypto/tls/handshake_server_test.go

@@ -143,7 +143,7 @@ func testServerScript(t *testing.T, name string, serverScript [][]byte, config *
 	if peers != nil {
 		gotpeers := <-pchan
 		if len(peers) == len(gotpeers) {
-			for i, _ := range peers {
+			for i := range peers {
 				if !peers[i].Equal(gotpeers[i]) {
 					t.Fatalf("%s: mismatch on peer cert %d", name, i)
 				}

libgo/go/crypto/tls/root_test.go

@@ -5,25 +5,25 @@
 package tls
 
 import (
+	"crypto/x509"
+	"runtime"
 	"testing"
 )
 
 var tlsServers = []string{
-	"google.com:443",
-	"github.com:443",
-	"twitter.com:443",
+	"google.com",
+	"github.com",
+	"twitter.com",
 }
 
 func TestOSCertBundles(t *testing.T) {
-	defaultRoots()
-
 	if testing.Short() {
 		t.Logf("skipping certificate tests in short mode")
 		return
 	}
 
 	for _, addr := range tlsServers {
-		conn, err := Dial("tcp", addr, nil)
+		conn, err := Dial("tcp", addr+":443", &Config{ServerName: addr})
 		if err != nil {
 			t.Errorf("unable to verify %v: %v", addr, err)
 			continue
@@ -34,3 +34,28 @@ func TestOSCertBundles(t *testing.T) {
 		}
 	}
 }
+
+func TestCertHostnameVerifyWindows(t *testing.T) {
+	if runtime.GOOS != "windows" {
+		return
+	}
+
+	if testing.Short() {
+		t.Logf("skipping certificate tests in short mode")
+		return
+	}
+
+	for _, addr := range tlsServers {
+		cfg := &Config{ServerName: "example.com"}
+		conn, err := Dial("tcp", addr+":443", cfg)
+		if err == nil {
+			conn.Close()
+			t.Errorf("should fail to verify for example.com: %v", addr)
+			continue
+		}
+		_, ok := err.(x509.HostnameError)
+		if !ok {
+			t.Errorf("error type mismatch, got: %v", err)
+		}
+	}
+}

libgo/go/crypto/tls/root_windows.go

-// Copyright 2011 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 tls
-
-import (
-	"crypto/x509"
-	"syscall"
-	"unsafe"
-)
-
-func loadStore(roots *x509.CertPool, name string) {
-	store, err := syscall.CertOpenSystemStore(syscall.InvalidHandle, syscall.StringToUTF16Ptr(name))
-	if err != nil {
-		return
-	}
-	defer syscall.CertCloseStore(store, 0)
-
-	var cert *syscall.CertContext
-	for {
-		cert, err = syscall.CertEnumCertificatesInStore(store, cert)
-		if err != nil {
-			return
-		}
-
-		buf := (*[1 << 20]byte)(unsafe.Pointer(cert.EncodedCert))[:]
-		// ParseCertificate requires its own copy of certificate data to keep.
-		buf2 := make([]byte, cert.Length)
-		copy(buf2, buf)
-		if c, err := x509.ParseCertificate(buf2); err == nil {
-			roots.AddCert(c)
-		}
-	}
-}
-
-func initDefaultRoots() {
-	roots := x509.NewCertPool()
-
-	// Roots
-	loadStore(roots, "ROOT")
-
-	// Intermediates
-	loadStore(roots, "CA")
-
-	varDefaultRoots = roots
-}

libgo/go/crypto/tls/tls.go

@@ -2,8 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// Package tls partially implements the TLS 1.1 protocol, as specified in RFC
-// 4346.
+// Package tls partially implements TLS 1.0, as specified in RFC 2246.
 package tls
 
 import (
@@ -98,7 +97,9 @@ func Dial(network, addr string, config *Config) (*Conn, error) {
 	if config == nil {
 		config = defaultConfig()
 	}
-	if config.ServerName != "" {
+	// If no ServerName is set, infer the ServerName
+	// from the hostname we're connecting to.
+	if config.ServerName == "" {
 		// Make a copy to avoid polluting argument or default.
 		c := *config
 		c.ServerName = hostname

libgo/go/crypto/x509/pkcs1.go

@@ -24,7 +24,7 @@ type pkcs1PrivateKey struct {
 	Dq   *big.Int `asn1:"optional"`
 	Qinv *big.Int `asn1:"optional"`
 
-	AdditionalPrimes []pkcs1AdditionalRSAPrime `asn1:"optional"`
+	AdditionalPrimes []pkcs1AdditionalRSAPrime `asn1:"optional,omitempty"`
 }
 
 type pkcs1AdditionalRSAPrime struct {

libgo/go/crypto/x509/root.go

+// Copyright 2012 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 x509
+
+import "sync"
+
+var (
+	once        sync.Once
+	systemRoots *CertPool
+)
+
+func systemRootsPool() *CertPool {
+	once.Do(initSystemRoots)
+	return systemRoots
+}

libgo/go/crypto/tls/root_darwin.go → libgo/go/crypto/x509/root_darwin.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-package tls
+package x509
 
 /*
 #cgo CFLAGS: -mmacosx-version-min=10.6 -D__MAC_OS_X_VERSION_MAX_ALLOWED=1060
@@ -59,13 +59,14 @@ int FetchPEMRoots(CFDataRef *pemRoots) {
 }
 */
 import "C"
-import (
-	"crypto/x509"
-	"unsafe"
-)
+import "unsafe"
 
-func initDefaultRoots() {
-	roots := x509.NewCertPool()
+func (c *Certificate) systemVerify(opts *VerifyOptions) (chains [][]*Certificate, err error) {
+	return nil, nil
+}
+
+func initSystemRoots() {
+	roots := NewCertPool()
 
 	var data C.CFDataRef = nil
 	err := C.FetchPEMRoots(&data)
@@ -75,5 +76,5 @@ func initDefaultRoots() {
 		roots.AppendCertsFromPEM(buf)
 	}
 
-	varDefaultRoots = roots
+	systemRoots = roots
 }

libgo/go/crypto/tls/root_stub.go → libgo/go/crypto/x509/root_stub.go

@@ -4,7 +4,12 @@
 
 // +build plan9 darwin,!cgo
 
-package tls
+package x509
 
-func initDefaultRoots() {
+func (c *Certificate) systemVerify(opts *VerifyOptions) (chains [][]*Certificate, err error) {
+	return nil, nil
+}
+
+func initSystemRoots() {
+	systemRoots = NewCertPool()
 }

libgo/go/crypto/tls/root_unix.go → libgo/go/crypto/x509/root_unix.go

@@ -4,12 +4,9 @@
 
 // +build freebsd linux openbsd netbsd
 
-package tls
+package x509
 
-import (
-	"crypto/x509"
-	"io/ioutil"
-)
+import "io/ioutil"
 
 // Possible certificate files; stop after finding one.
 var certFiles = []string{
@@ -20,8 +17,12 @@ var certFiles = []string{
 	"/usr/local/share/certs/ca-root-nss.crt", // FreeBSD
 }
 
-func initDefaultRoots() {
-	roots := x509.NewCertPool()
+func (c *Certificate) systemVerify(opts *VerifyOptions) (chains [][]*Certificate, err error) {
+	return nil, nil
+}
+
+func initSystemRoots() {
+	roots := NewCertPool()
 	for _, file := range certFiles {
 		data, err := ioutil.ReadFile(file)
 		if err == nil {
@@ -29,5 +30,6 @@ func initDefaultRoots() {
 			break
 		}
 	}
-	varDefaultRoots = roots
+
+	systemRoots = roots
 }

libgo/go/crypto/x509/root_windows.go

+// Copyright 2012 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 x509
+
+import (
+	"errors"
+	"syscall"
+	"unsafe"
+)
+
+// Creates a new *syscall.CertContext representing the leaf certificate in an in-memory
+// certificate store containing itself and all of the intermediate certificates specified
+// in the opts.Intermediates CertPool.
+//
+// A pointer to the in-memory store is available in the returned CertContext's Store field.
+// The store is automatically freed when the CertContext is freed using
+// syscall.CertFreeCertificateContext.
+func createStoreContext(leaf *Certificate, opts *VerifyOptions) (*syscall.CertContext, error) {
+	var storeCtx *syscall.CertContext
+
+	leafCtx, err := syscall.CertCreateCertificateContext(syscall.X509_ASN_ENCODING|syscall.PKCS_7_ASN_ENCODING, &leaf.Raw[0], uint32(len(leaf.Raw)))
+	if err != nil {
+		return nil, err
+	}
+	defer syscall.CertFreeCertificateContext(leafCtx)
+
+	handle, err := syscall.CertOpenStore(syscall.CERT_STORE_PROV_MEMORY, 0, 0, syscall.CERT_STORE_DEFER_CLOSE_UNTIL_LAST_FREE_FLAG, 0)
+	if err != nil {
+		return nil, err
+	}
+	defer syscall.CertCloseStore(handle, 0)
+
+	err = syscall.CertAddCertificateContextToStore(handle, leafCtx, syscall.CERT_STORE_ADD_ALWAYS, &storeCtx)
+	if err != nil {
+		return nil, err
+	}
+
+	if opts.Intermediates != nil {
+		for _, intermediate := range opts.Intermediates.certs {
+			ctx, err := syscall.CertCreateCertificateContext(syscall.X509_ASN_ENCODING|syscall.PKCS_7_ASN_ENCODING, &intermediate.Raw[0], uint32(len(intermediate.Raw)))
+			if err != nil {
+				return nil, err
+			}
+
+			err = syscall.CertAddCertificateContextToStore(handle, ctx, syscall.CERT_STORE_ADD_ALWAYS, nil)
+			syscall.CertFreeCertificateContext(ctx)
+			if err != nil {
+				return nil, err
+			}
+		}
+	}
+
+	return storeCtx, nil
+}
+
+// extractSimpleChain extracts the final certificate chain from a CertSimpleChain.
+func extractSimpleChain(simpleChain **syscall.CertSimpleChain, count int) (chain []*Certificate, err error) {
+	if simpleChain == nil || count == 0 {
+		return nil, errors.New("x509: invalid simple chain")
+	}
+
+	simpleChains := (*[1 << 20]*syscall.CertSimpleChain)(unsafe.Pointer(simpleChain))[:]
+	lastChain := simpleChains[count-1]
+	elements := (*[1 << 20]*syscall.CertChainElement)(unsafe.Pointer(lastChain.Elements))[:]
+	for i := 0; i < int(lastChain.NumElements); i++ {
+		// Copy the buf, since ParseCertificate does not create its own copy.
+		cert := elements[i].CertContext
+		encodedCert := (*[1 << 20]byte)(unsafe.Pointer(cert.EncodedCert))[:]
+		buf := make([]byte, cert.Length)
+		copy(buf, encodedCert[:])
+		parsedCert, err := ParseCertificate(buf)
+		if err != nil {
+			return nil, err
+		}
+		chain = append(chain, parsedCert)
+	}
+
+	return chain, nil
+}
+
+// checkChainTrustStatus checks the trust status of the certificate chain, translating
+// any errors it finds into Go errors in the process.
+func checkChainTrustStatus(c *Certificate, chainCtx *syscall.CertChainContext) error {
+	if chainCtx.TrustStatus.ErrorStatus != syscall.CERT_TRUST_NO_ERROR {
+		status := chainCtx.TrustStatus.ErrorStatus
+		switch status {
+		case syscall.CERT_TRUST_IS_NOT_TIME_VALID:
+			return CertificateInvalidError{c, Expired}
+		default:
+			return UnknownAuthorityError{c}
+		}
+	}
+	return nil
+}
+
+// checkChainSSLServerPolicy checks that the certificate chain in chainCtx is valid for
+// use as a certificate chain for a SSL/TLS server.
+func checkChainSSLServerPolicy(c *Certificate, chainCtx *syscall.CertChainContext, opts *VerifyOptions) error {
+	sslPara := &syscall.SSLExtraCertChainPolicyPara{
+		AuthType:   syscall.AUTHTYPE_SERVER,
+		ServerName: syscall.StringToUTF16Ptr(opts.DNSName),
+	}
+	sslPara.Size = uint32(unsafe.Sizeof(*sslPara))
+
+	para := &syscall.CertChainPolicyPara{
+		ExtraPolicyPara: uintptr(unsafe.Pointer(sslPara)),
+	}
+	para.Size = uint32(unsafe.Sizeof(*para))
+
+	status := syscall.CertChainPolicyStatus{}
+	err := syscall.CertVerifyCertificateChainPolicy(syscall.CERT_CHAIN_POLICY_SSL, chainCtx, para, &status)
+	if err != nil {
+		return err
+	}
+
+	// TODO(mkrautz): use the lChainIndex and lElementIndex fields
+	// of the CertChainPolicyStatus to provide proper context, instead
+	// using c.
+	if status.Error != 0 {
+		switch status.Error {
+		case syscall.CERT_E_EXPIRED:
+			return CertificateInvalidError{c, Expired}
+		case syscall.CERT_E_CN_NO_MATCH:
+			return HostnameError{c, opts.DNSName}
+		case syscall.CERT_E_UNTRUSTEDROOT:
+			return UnknownAuthorityError{c}
+		default:
+			return UnknownAuthorityError{c}
+		}
+	}
+
+	return nil
+}
+
+// systemVerify is like Verify, except that it uses CryptoAPI calls
+// to build certificate chains and verify them.
+func (c *Certificate) systemVerify(opts *VerifyOptions) (chains [][]*Certificate, err error) {
+	hasDNSName := opts != nil && len(opts.DNSName) > 0
+
+	storeCtx, err := createStoreContext(c, opts)
+	if err != nil {
+		return nil, err
+	}
+	defer syscall.CertFreeCertificateContext(storeCtx)
+
+	para := new(syscall.CertChainPara)
+	para.Size = uint32(unsafe.Sizeof(*para))
+
+	// If there's a DNSName set in opts, assume we're verifying
+	// a certificate from a TLS server.
+	if hasDNSName {
+		oids := []*byte{
+			&syscall.OID_PKIX_KP_SERVER_AUTH[0],
+			// Both IE and Chrome allow certificates with
+			// Server Gated Crypto as well. Some certificates
+			// in the wild require them.
+			&syscall.OID_SERVER_GATED_CRYPTO[0],
+			&syscall.OID_SGC_NETSCAPE[0],
+		}
+		para.RequestedUsage.Type = syscall.USAGE_MATCH_TYPE_OR
+		para.RequestedUsage.Usage.Length = uint32(len(oids))
+		para.RequestedUsage.Usage.UsageIdentifiers = &oids[0]
+	} else {
+		para.RequestedUsage.Type = syscall.USAGE_MATCH_TYPE_AND
+		para.RequestedUsage.Usage.Length = 0
+		para.RequestedUsage.Usage.UsageIdentifiers = nil
+	}
+
+	var verifyTime *syscall.Filetime
+	if opts != nil && !opts.CurrentTime.IsZero() {
+		ft := syscall.NsecToFiletime(opts.CurrentTime.UnixNano())
+		verifyTime = &ft
+	}
+
+	// CertGetCertificateChain will traverse Windows's root stores
+	// in an attempt to build a verified certificate chain.  Once
+	// it has found a verified chain, it stops. MSDN docs on
+	// CERT_CHAIN_CONTEXT:
+	//
+	//   When a CERT_CHAIN_CONTEXT is built, the first simple chain
+	//   begins with an end certificate and ends with a self-signed
+	//   certificate. If that self-signed certificate is not a root
+	//   or otherwise trusted certificate, an attempt is made to
+	//   build a new chain. CTLs are used to create the new chain
+	//   beginning with the self-signed certificate from the original
+	//   chain as the end certificate of the new chain. This process
+	//   continues building additional simple chains until the first
+	//   self-signed certificate is a trusted certificate or until
+	//   an additional simple chain cannot be built.
+	//
+	// The result is that we'll only get a single trusted chain to
+	// return to our caller.
+	var chainCtx *syscall.CertChainContext
+	err = syscall.CertGetCertificateChain(syscall.Handle(0), storeCtx, verifyTime, storeCtx.Store, para, 0, 0, &chainCtx)
+	if err != nil {
+		return nil, err
+	}
+	defer syscall.CertFreeCertificateChain(chainCtx)
+
+	err = checkChainTrustStatus(c, chainCtx)
+	if err != nil {
+		return nil, err
+	}
+
+	if hasDNSName {
+		err = checkChainSSLServerPolicy(c, chainCtx, opts)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	chain, err := extractSimpleChain(chainCtx.Chains, int(chainCtx.ChainCount))
+	if err != nil {
+		return nil, err
+	}
+
+	chains = append(chains, chain)
+
+	return chains, nil
+}
+
+func initSystemRoots() {
+	systemRoots = NewCertPool()
+}

libgo/go/crypto/x509/verify.go

@@ -5,6 +5,7 @@
 package x509
 
 import (
+	"runtime"
 	"strings"
 	"time"
 	"unicode/utf8"
@@ -23,6 +24,9 @@ const (
 	// certificate has a name constraint which doesn't include the name
 	// being checked.
 	CANotAuthorizedForThisName
+	// TooManyIntermediates results when a path length constraint is
+	// violated.
+	TooManyIntermediates
 )
 
 // CertificateInvalidError results when an odd error occurs. Users of this
@@ -40,6 +44,8 @@ func (e CertificateInvalidError) Error() string {
 		return "x509: certificate has expired or is not yet valid"
 	case CANotAuthorizedForThisName:
 		return "x509: a root or intermediate certificate is not authorized to sign in this domain"
+	case TooManyIntermediates:
+		return "x509: too many intermediates for path length constraint"
 	}
 	return "x509: unknown error"
 }
@@ -76,7 +82,7 @@ func (e UnknownAuthorityError) Error() string {
 type VerifyOptions struct {
 	DNSName       string
 	Intermediates *CertPool
-	Roots         *CertPool
+	Roots         *CertPool // if nil, the system roots are used
 	CurrentTime   time.Time // if zero, the current time is used
 }
 
@@ -87,7 +93,7 @@ const (
 )
 
 // isValid performs validity checks on the c.
-func (c *Certificate) isValid(certType int, opts *VerifyOptions) error {
+func (c *Certificate) isValid(certType int, currentChain []*Certificate, opts *VerifyOptions) error {
 	now := opts.CurrentTime
 	if now.IsZero() {
 		now = time.Now()
@@ -130,26 +136,44 @@ func (c *Certificate) isValid(certType int, opts *VerifyOptions) error {
 		return CertificateInvalidError{c, NotAuthorizedToSign}
 	}
 
+	if c.BasicConstraintsValid && c.MaxPathLen >= 0 {
+		numIntermediates := len(currentChain) - 1
+		if numIntermediates > c.MaxPathLen {
+			return CertificateInvalidError{c, TooManyIntermediates}
+		}
+	}
+
 	return nil
 }
 
 // Verify attempts to verify c by building one or more chains from c to a
-// certificate in opts.roots, using certificates in opts.Intermediates if
+// certificate in opts.Roots, using certificates in opts.Intermediates if
 // needed. If successful, it returns one or more chains where the first
 // element of the chain is c and the last element is from opts.Roots.
 //
 // WARNING: this doesn't do any revocation checking.
 func (c *Certificate) Verify(opts VerifyOptions) (chains [][]*Certificate, err error) {
-	err = c.isValid(leafCertificate, &opts)
+	// Use Windows's own verification and chain building.
+	if opts.Roots == nil && runtime.GOOS == "windows" {
+		return c.systemVerify(&opts)
+	}
+
+	if opts.Roots == nil {
+		opts.Roots = systemRootsPool()
+	}
+
+	err = c.isValid(leafCertificate, nil, &opts)
 	if err != nil {
 		return
 	}
+
 	if len(opts.DNSName) > 0 {
 		err = c.VerifyHostname(opts.DNSName)
 		if err != nil {
 			return
 		}
 	}
+
 	return c.buildChains(make(map[int][][]*Certificate), []*Certificate{c}, &opts)
 }
 
@@ -163,7 +187,7 @@ func appendToFreshChain(chain []*Certificate, cert *Certificate) []*Certificate
 func (c *Certificate) buildChains(cache map[int][][]*Certificate, currentChain []*Certificate, opts *VerifyOptions) (chains [][]*Certificate, err error) {
 	for _, rootNum := range opts.Roots.findVerifiedParents(c) {
 		root := opts.Roots.certs[rootNum]
-		err = root.isValid(rootCertificate, opts)
+		err = root.isValid(rootCertificate, currentChain, opts)
 		if err != nil {
 			continue
 		}
@@ -178,7 +202,7 @@ nextIntermediate:
 				continue nextIntermediate
 			}
 		}
-		err = intermediate.isValid(intermediateCertificate, opts)
+		err = intermediate.isValid(intermediateCertificate, currentChain, opts)
 		if err != nil {
 			continue
 		}

libgo/go/crypto/x509/verify_test.go

@@ -8,6 +8,7 @@ import (
 	"crypto/x509/pkix"
 	"encoding/pem"
 	"errors"
+	"runtime"
 	"strings"
 	"testing"
 	"time"
@@ -19,7 +20,7 @@ type verifyTest struct {
 	roots         []string
 	currentTime   int64
 	dnsName       string
-	nilRoots      bool
+	systemSkip    bool
 
 	errorCallback  func(*testing.T, int, error) bool
 	expectedChains [][]string
@@ -60,14 +61,6 @@ var verifyTests = []verifyTest{
 	{
 		leaf:          googleLeaf,
 		intermediates: []string{thawteIntermediate},
-		nilRoots:      true, // verifies that we don't crash
-		currentTime:   1302726541,
-		dnsName:       "www.google.com",
-		errorCallback: expectAuthorityUnknown,
-	},
-	{
-		leaf:          googleLeaf,
-		intermediates: []string{thawteIntermediate},
 		roots:         []string{verisignRoot},
 		currentTime:   1,
 		dnsName:       "www.example.com",
@@ -80,6 +73,9 @@ var verifyTests = []verifyTest{
 		currentTime: 1302726541,
 		dnsName:     "www.google.com",
 
+		// Skip when using systemVerify, since Windows
+		// *will* find the missing intermediate cert.
+		systemSkip:    true,
 		errorCallback: expectAuthorityUnknown,
 	},
 	{
@@ -109,6 +105,9 @@ var verifyTests = []verifyTest{
 		roots:         []string{startComRoot},
 		currentTime:   1302726541,
 
+		// Skip when using systemVerify, since Windows
+		// can only return a single chain to us (for now).
+		systemSkip: true,
 		expectedChains: [][]string{
 			{"dnssec-exp", "StartCom Class 1", "StartCom Certification Authority"},
 			{"dnssec-exp", "StartCom Class 1", "StartCom Certification Authority", "StartCom Certification Authority"},
@@ -148,23 +147,26 @@ func certificateFromPEM(pemBytes string) (*Certificate, error) {
 	return ParseCertificate(block.Bytes)
 }
 
-func TestVerify(t *testing.T) {
+func testVerify(t *testing.T, useSystemRoots bool) {
 	for i, test := range verifyTests {
+		if useSystemRoots && test.systemSkip {
+			continue
+		}
+
 		opts := VerifyOptions{
-			Roots:         NewCertPool(),
 			Intermediates: NewCertPool(),
 			DNSName:       test.dnsName,
 			CurrentTime:   time.Unix(test.currentTime, 0),
 		}
-		if test.nilRoots {
-			opts.Roots = nil
-		}
 
-		for j, root := range test.roots {
-			ok := opts.Roots.AppendCertsFromPEM([]byte(root))
-			if !ok {
-				t.Errorf("#%d: failed to parse root #%d", i, j)
-				return
+		if !useSystemRoots {
+			opts.Roots = NewCertPool()
+			for j, root := range test.roots {
+				ok := opts.Roots.AppendCertsFromPEM([]byte(root))
+				if !ok {
+					t.Errorf("#%d: failed to parse root #%d", i, j)
+					return
+				}
 			}
 		}
 
@@ -225,6 +227,19 @@ func TestVerify(t *testing.T) {
 	}
 }
 
+func TestGoVerify(t *testing.T) {
+	testVerify(t, false)
+}
+
+func TestSystemVerify(t *testing.T) {
+	if runtime.GOOS != "windows" {
+		t.Logf("skipping verify test using system APIs on %q", runtime.GOOS)
+		return
+	}
+
+	testVerify(t, true)
+}
+
 func chainToDebugString(chain []*Certificate) string {
 	var chainStr string
 	for _, cert := range chain {

libgo/go/crypto/x509/x509.go

@@ -429,7 +429,7 @@ func (h UnhandledCriticalExtension) Error() string {
 
 type basicConstraints struct {
 	IsCA       bool `asn1:"optional"`
-	MaxPathLen int  `asn1:"optional"`
+	MaxPathLen int  `asn1:"optional,default:-1"`
 }
 
 // RFC 5280 4.2.1.4

libgo/go/database/sql/driver/driver.go

@@ -43,6 +43,17 @@ type Driver interface {
 // documented.
 var ErrSkip = errors.New("driver: skip fast-path; continue as if unimplemented")
 
+// ErrBadConn should be returned by a driver to signal to the sql
+// package that a driver.Conn is in a bad state (such as the server
+// having earlier closed the connection) and the sql package should
+// retry on a new connection.
+//
+// To prevent duplicate operations, ErrBadConn should NOT be returned
+// if there's a possibility that the database server might have
+// performed the operation. Even if the server sends back an error,
+// you shouldn't return ErrBadConn.
+var ErrBadConn = errors.New("driver: bad connection")
+
 // Execer is an optional interface that may be implemented by a Conn.
 //
 // If a Conn does not implement Execer, the db package's DB.Exec will

libgo/go/database/sql/fakedb_test.go

@@ -82,6 +82,7 @@ type fakeConn struct {
 	mu          sync.Mutex
 	stmtsMade   int
 	stmtsClosed int
+	numPrepare  int
 }
 
 func (c *fakeConn) incrStat(v *int) {
@@ -208,10 +209,13 @@ func (c *fakeConn) Begin() (driver.Tx, error) {
 
 func (c *fakeConn) Close() error {
 	if c.currTx != nil {
-		return errors.New("can't close; in a Transaction")
+		return errors.New("can't close fakeConn; in a Transaction")
 	}
 	if c.db == nil {
-		return errors.New("can't close; already closed")
+		return errors.New("can't close fakeConn; already closed")
+	}
+	if c.stmtsMade > c.stmtsClosed {
+		return errors.New("can't close; dangling statement(s)")
 	}
 	c.db = nil
 	return nil
@@ -249,6 +253,7 @@ func errf(msg string, args ...interface{}) error {
 //  just a limitation for fakedb)
 func (c *fakeConn) prepareSelect(stmt *fakeStmt, parts []string) (driver.Stmt, error) {
 	if len(parts) != 3 {
+		stmt.Close()
 		return nil, errf("invalid SELECT syntax with %d parts; want 3", len(parts))
 	}
 	stmt.table = parts[0]
@@ -259,14 +264,17 @@ func (c *fakeConn) prepareSelect(stmt *fakeStmt, parts []string) (driver.Stmt, e
 		}
 		nameVal := strings.Split(colspec, "=")
 		if len(nameVal) != 2 {
+			stmt.Close()
 			return nil, errf("SELECT on table %q has invalid column spec of %q (index %d)", stmt.table, colspec, n)
 		}
 		column, value := nameVal[0], nameVal[1]
 		_, ok := c.db.columnType(stmt.table, column)
 		if !ok {
+			stmt.Close()
 			return nil, errf("SELECT on table %q references non-existent column %q", stmt.table, column)
 		}
 		if value != "?" {
+			stmt.Close()
 			return nil, errf("SELECT on table %q has pre-bound value for where column %q; need a question mark",
 				stmt.table, column)
 		}
@@ -279,12 +287,14 @@ func (c *fakeConn) prepareSelect(stmt *fakeStmt, parts []string) (driver.Stmt, e
 // parts are table|col=type,col2=type2
 func (c *fakeConn) prepareCreate(stmt *fakeStmt, parts []string) (driver.Stmt, error) {
 	if len(parts) != 2 {
+		stmt.Close()
 		return nil, errf("invalid CREATE syntax with %d parts; want 2", len(parts))
 	}
 	stmt.table = parts[0]
 	for n, colspec := range strings.Split(parts[1], ",") {
 		nameType := strings.Split(colspec, "=")
 		if len(nameType) != 2 {
+			stmt.Close()
 			return nil, errf("CREATE table %q has invalid column spec of %q (index %d)", stmt.table, colspec, n)
 		}
 		stmt.colName = append(stmt.colName, nameType[0])
@@ -296,17 +306,20 @@ func (c *fakeConn) prepareCreate(stmt *fakeStmt, parts []string) (driver.Stmt, e
 // parts are table|col=?,col2=val
 func (c *fakeConn) prepareInsert(stmt *fakeStmt, parts []string) (driver.Stmt, error) {
 	if len(parts) != 2 {
+		stmt.Close()
 		return nil, errf("invalid INSERT syntax with %d parts; want 2", len(parts))
 	}
 	stmt.table = parts[0]
 	for n, colspec := range strings.Split(parts[1], ",") {
 		nameVal := strings.Split(colspec, "=")
 		if len(nameVal) != 2 {
+			stmt.Close()
 			return nil, errf("INSERT table %q has invalid column spec of %q (index %d)", stmt.table, colspec, n)
 		}
 		column, value := nameVal[0], nameVal[1]
 		ctype, ok := c.db.columnType(stmt.table, column)
 		if !ok {
+			stmt.Close()
 			return nil, errf("INSERT table %q references non-existent column %q", stmt.table, column)
 		}
 		stmt.colName = append(stmt.colName, column)
@@ -322,10 +335,12 @@ func (c *fakeConn) prepareInsert(stmt *fakeStmt, parts []string) (driver.Stmt, e
 			case "int32":
 				i, err := strconv.Atoi(value)
 				if err != nil {
+					stmt.Close()
 					return nil, errf("invalid conversion to int32 from %q", value)
 				}
 				subsetVal = int64(i) // int64 is a subset type, but not int32
 			default:
+				stmt.Close()
 				return nil, errf("unsupported conversion for pre-bound parameter %q to type %q", value, ctype)
 			}
 			stmt.colValue = append(stmt.colValue, subsetVal)
@@ -339,6 +354,7 @@ func (c *fakeConn) prepareInsert(stmt *fakeStmt, parts []string) (driver.Stmt, e
 }
 
 func (c *fakeConn) Prepare(query string) (driver.Stmt, error) {
+	c.numPrepare++
 	if c.db == nil {
 		panic("nil c.db; conn = " + fmt.Sprintf("%#v", c))
 	}
@@ -360,6 +376,7 @@ func (c *fakeConn) Prepare(query string) (driver.Stmt, error) {
 	case "INSERT":
 		return c.prepareInsert(stmt, parts)
 	default:
+		stmt.Close()
 		return nil, errf("unsupported command type %q", cmd)
 	}
 	return stmt, nil

libgo/go/database/sql/sql.go

@@ -175,6 +175,16 @@ var ErrNoRows = errors.New("sql: no rows in result set")
 
 // DB is a database handle. It's safe for concurrent use by multiple
 // goroutines.
+//
+// If the underlying database driver has the concept of a connection
+// and per-connection session state, the sql package manages creating
+// and freeing connections automatically, including maintaining a free
+// pool of idle connections. If observing session state is required,
+// either do not share a *DB between multiple concurrent goroutines or
+// create and observe all state only within a transaction. Once
+// DB.Open is called, the returned Tx is bound to a single isolated
+// connection. Once Tx.Commit or Tx.Rollback is called, that
+// connection is returned to DB's idle connection pool.
 type DB struct {
 	driver driver.Driver
 	dsn    string
@@ -241,34 +251,56 @@ func (db *DB) conn() (driver.Conn, error) {
 func (db *DB) connIfFree(wanted driver.Conn) (conn driver.Conn, ok bool) {
 	db.mu.Lock()
 	defer db.mu.Unlock()
-	for n, conn := range db.freeConn {
-		if conn == wanted {
-			db.freeConn[n] = db.freeConn[len(db.freeConn)-1]
-			db.freeConn = db.freeConn[:len(db.freeConn)-1]
-			return wanted, true
+	for i, conn := range db.freeConn {
+		if conn != wanted {
+			continue
 		}
+		db.freeConn[i] = db.freeConn[len(db.freeConn)-1]
+		db.freeConn = db.freeConn[:len(db.freeConn)-1]
+		return wanted, true
 	}
 	return nil, false
 }
 
-func (db *DB) putConn(c driver.Conn) {
+// putConnHook is a hook for testing.
+var putConnHook func(*DB, driver.Conn)
+
+// putConn adds a connection to the db's free pool.
+// err is optionally the last error that occured on this connection.
+func (db *DB) putConn(c driver.Conn, err error) {
+	if err == driver.ErrBadConn {
+		// Don't reuse bad connections.
+		return
+	}
 	db.mu.Lock()
-	defer db.mu.Unlock()
+	if putConnHook != nil {
+		putConnHook(db, c)
+	}
 	if n := len(db.freeConn); !db.closed && n < db.maxIdleConns() {
 		db.freeConn = append(db.freeConn, c)
+		db.mu.Unlock()
 		return
 	}
-	db.closeConn(c) // TODO(bradfitz): release lock before calling this?
-}
-
-func (db *DB) closeConn(c driver.Conn) {
-	// TODO: check to see if we need this Conn for any prepared statements
-	// that are active.
+	// TODO: check to see if we need this Conn for any prepared
+	// statements which are still active?
+	db.mu.Unlock()
 	c.Close()
 }
 
 // Prepare creates a prepared statement for later execution.
 func (db *DB) Prepare(query string) (*Stmt, error) {
+	var stmt *Stmt
+	var err error
+	for i := 0; i < 10; i++ {
+		stmt, err = db.prepare(query)
+		if err != driver.ErrBadConn {
+			break
+		}
+	}
+	return stmt, err
+}
+
+func (db *DB) prepare(query string) (stmt *Stmt, err error) {
 	// TODO: check if db.driver supports an optional
 	// driver.Preparer interface and call that instead, if so,
 	// otherwise we make a prepared statement that's bound
@@ -279,12 +311,12 @@ func (db *DB) Prepare(query string) (*Stmt, error) {
 	if err != nil {
 		return nil, err
 	}
-	defer db.putConn(ci)
+	defer db.putConn(ci, err)
 	si, err := ci.Prepare(query)
 	if err != nil {
 		return nil, err
 	}
-	stmt := &Stmt{
+	stmt = &Stmt{
 		db:    db,
 		query: query,
 		css:   []connStmt{{ci, si}},
@@ -295,15 +327,22 @@ func (db *DB) Prepare(query string) (*Stmt, error) {
 // Exec executes a query without returning any rows.
 func (db *DB) Exec(query string, args ...interface{}) (Result, error) {
 	sargs, err := subsetTypeArgs(args)
-	if err != nil {
-		return nil, err
+	var res Result
+	for i := 0; i < 10; i++ {
+		res, err = db.exec(query, sargs)
+		if err != driver.ErrBadConn {
+			break
+		}
 	}
+	return res, err
+}
 
+func (db *DB) exec(query string, sargs []driver.Value) (res Result, err error) {
 	ci, err := db.conn()
 	if err != nil {
 		return nil, err
 	}
-	defer db.putConn(ci)
+	defer db.putConn(ci, err)
 
 	if execer, ok := ci.(driver.Execer); ok {
 		resi, err := execer.Exec(query, sargs)
@@ -354,13 +393,25 @@ func (db *DB) QueryRow(query string, args ...interface{}) *Row {
 // Begin starts a transaction. The isolation level is dependent on
 // the driver.
 func (db *DB) Begin() (*Tx, error) {
+	var tx *Tx
+	var err error
+	for i := 0; i < 10; i++ {
+		tx, err = db.begin()
+		if err != driver.ErrBadConn {
+			break
+		}
+	}
+	return tx, err
+}
+
+func (db *DB) begin() (tx *Tx, err error) {
 	ci, err := db.conn()
 	if err != nil {
 		return nil, err
 	}
 	txi, err := ci.Begin()
 	if err != nil {
-		db.putConn(ci)
+		db.putConn(ci, err)
 		return nil, fmt.Errorf("sql: failed to Begin transaction: %v", err)
 	}
 	return &Tx{
@@ -406,7 +457,7 @@ func (tx *Tx) close() {
 		panic("double close") // internal error
 	}
 	tx.done = true
-	tx.db.putConn(tx.ci)
+	tx.db.putConn(tx.ci, nil)
 	tx.ci = nil
 	tx.txi = nil
 }
@@ -561,9 +612,11 @@ func (tx *Tx) Query(query string, args ...interface{}) (*Rows, error) {
 		return nil, err
 	}
 	rows, err := stmt.Query(args...)
-	if err == nil {
-		rows.closeStmt = stmt
+	if err != nil {
+		stmt.Close()
+		return nil, err
 	}
+	rows.closeStmt = stmt
 	return rows, err
 }
 
@@ -609,7 +662,7 @@ func (s *Stmt) Exec(args ...interface{}) (Result, error) {
 	if err != nil {
 		return nil, err
 	}
-	defer releaseConn()
+	defer releaseConn(nil)
 
 	// -1 means the driver doesn't know how to count the number of
 	// placeholders, so we won't sanity check input here and instead let the
@@ -672,7 +725,7 @@ func (s *Stmt) Exec(args ...interface{}) (Result, error) {
 // connStmt returns a free driver connection on which to execute the
 // statement, a function to call to release the connection, and a
 // statement bound to that connection.
-func (s *Stmt) connStmt() (ci driver.Conn, releaseConn func(), si driver.Stmt, err error) {
+func (s *Stmt) connStmt() (ci driver.Conn, releaseConn func(error), si driver.Stmt, err error) {
 	if err = s.stickyErr; err != nil {
 		return
 	}
@@ -691,7 +744,7 @@ func (s *Stmt) connStmt() (ci driver.Conn, releaseConn func(), si driver.Stmt, e
 		if err != nil {
 			return
 		}
-		releaseConn = func() { s.tx.releaseConn() }
+		releaseConn = func(error) { s.tx.releaseConn() }
 		return ci, releaseConn, s.txsi, nil
 	}
 
@@ -700,7 +753,7 @@ func (s *Stmt) connStmt() (ci driver.Conn, releaseConn func(), si driver.Stmt, e
 	for _, v := range s.css {
 		// TODO(bradfitz): lazily clean up entries in this
 		// list with dead conns while enumerating
-		if _, match = s.db.connIfFree(cs.ci); match {
+		if _, match = s.db.connIfFree(v.ci); match {
 			cs = v
 			break
 		}
@@ -710,22 +763,28 @@ func (s *Stmt) connStmt() (ci driver.Conn, releaseConn func(), si driver.Stmt, e
 	// Make a new conn if all are busy.
 	// TODO(bradfitz): or wait for one? make configurable later?
 	if !match {
-		ci, err := s.db.conn()
-		if err != nil {
-			return nil, nil, nil, err
-		}
-		si, err := ci.Prepare(s.query)
-		if err != nil {
-			return nil, nil, nil, err
+		for i := 0; ; i++ {
+			ci, err := s.db.conn()
+			if err != nil {
+				return nil, nil, nil, err
+			}
+			si, err := ci.Prepare(s.query)
+			if err == driver.ErrBadConn && i < 10 {
+				continue
+			}
+			if err != nil {
+				return nil, nil, nil, err
+			}
+			s.mu.Lock()
+			cs = connStmt{ci, si}
+			s.css = append(s.css, cs)
+			s.mu.Unlock()
+			break
 		}
-		s.mu.Lock()
-		cs = connStmt{ci, si}
-		s.css = append(s.css, cs)
-		s.mu.Unlock()
 	}
 
 	conn := cs.ci
-	releaseConn = func() { s.db.putConn(conn) }
+	releaseConn = func(err error) { s.db.putConn(conn, err) }
 	return conn, releaseConn, cs.si, nil
 }
 
@@ -749,7 +808,7 @@ func (s *Stmt) Query(args ...interface{}) (*Rows, error) {
 	}
 	rowsi, err := si.Query(sargs)
 	if err != nil {
-		s.db.putConn(ci)
+		releaseConn(err)
 		return nil, err
 	}
 	// Note: ownership of ci passes to the *Rows, to be freed
@@ -800,7 +859,7 @@ func (s *Stmt) Close() error {
 		for _, v := range s.css {
 			if ci, match := s.db.connIfFree(v.ci); match {
 				v.si.Close()
-				s.db.putConn(ci)
+				s.db.putConn(ci, nil)
 			} else {
 				// TODO(bradfitz): care that we can't close
 				// this statement because the statement's
@@ -827,7 +886,7 @@ func (s *Stmt) Close() error {
 type Rows struct {
 	db          *DB
 	ci          driver.Conn // owned; must call putconn when closed to release
-	releaseConn func()
+	releaseConn func(error)
 	rowsi       driver.Rows
 
 	closed    bool
@@ -939,7 +998,7 @@ func (rs *Rows) Close() error {
 	}
 	rs.closed = true
 	err := rs.rowsi.Close()
-	rs.releaseConn()
+	rs.releaseConn(err)
 	if rs.closeStmt != nil {
 		rs.closeStmt.Close()
 	}
@@ -963,7 +1022,7 @@ func (r *Row) Scan(dest ...interface{}) error {
 	}
 
 	// TODO(bradfitz): for now we need to defensively clone all
-	// []byte that the driver returned (not permitting 
+	// []byte that the driver returned (not permitting
 	// *RawBytes in Rows.Scan), since we're about to close
 	// the Rows in our defer, when we return from this function.
 	// the contract with the driver.Next(...) interface is that it

libgo/go/database/sql/sql_test.go

@@ -5,13 +5,35 @@
 package sql
 
 import (
+	"database/sql/driver"
 	"fmt"
 	"reflect"
+	"runtime"
 	"strings"
 	"testing"
 	"time"
 )
 
+func init() {
+	type dbConn struct {
+		db *DB
+		c  driver.Conn
+	}
+	freedFrom := make(map[dbConn]string)
+	putConnHook = func(db *DB, c driver.Conn) {
+		for _, oc := range db.freeConn {
+			if oc == c {
+				// print before panic, as panic may get lost due to conflicting panic
+				// (all goroutines asleep) elsewhere, since we might not unlock
+				// the mutex in freeConn here.
+				println("double free of conn. conflicts are:\nA) " + freedFrom[dbConn{db, c}] + "\n\nand\nB) " + stack())
+				panic("double free of conn.")
+			}
+		}
+		freedFrom[dbConn{db, c}] = stack()
+	}
+}
+
 const fakeDBName = "foo"
 
 var chrisBirthday = time.Unix(123456789, 0)
@@ -47,9 +69,19 @@ func closeDB(t *testing.T, db *DB) {
 	}
 }
 
+// numPrepares assumes that db has exactly 1 idle conn and returns
+// its count of calls to Prepare
+func numPrepares(t *testing.T, db *DB) int {
+	if n := len(db.freeConn); n != 1 {
+		t.Fatalf("free conns = %d; want 1", n)
+	}
+	return db.freeConn[0].(*fakeConn).numPrepare
+}
+
 func TestQuery(t *testing.T) {
 	db := newTestDB(t, "people")
 	defer closeDB(t, db)
+	prepares0 := numPrepares(t, db)
 	rows, err := db.Query("SELECT|people|age,name|")
 	if err != nil {
 		t.Fatalf("Query: %v", err)
@@ -83,7 +115,10 @@ func TestQuery(t *testing.T) {
 	// And verify that the final rows.Next() call, which hit EOF,
 	// also closed the rows connection.
 	if n := len(db.freeConn); n != 1 {
-		t.Errorf("free conns after query hitting EOF = %d; want 1", n)
+		t.Fatalf("free conns after query hitting EOF = %d; want 1", n)
+	}
+	if prepares := numPrepares(t, db) - prepares0; prepares != 1 {
+		t.Errorf("executed %d Prepare statements; want 1", prepares)
 	}
 }
 
@@ -216,6 +251,7 @@ func TestStatementQueryRow(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Prepare: %v", err)
 	}
+	defer stmt.Close()
 	var age int
 	for n, tt := range []struct {
 		name string
@@ -256,6 +292,7 @@ func TestExec(t *testing.T) {
 	if err != nil {
 		t.Errorf("Stmt, err = %v, %v", stmt, err)
 	}
+	defer stmt.Close()
 
 	type execTest struct {
 		args    []interface{}
@@ -297,11 +334,14 @@ func TestTxStmt(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Stmt, err = %v, %v", stmt, err)
 	}
+	defer stmt.Close()
 	tx, err := db.Begin()
 	if err != nil {
 		t.Fatalf("Begin = %v", err)
 	}
-	_, err = tx.Stmt(stmt).Exec("Bobby", 7)
+	txs := tx.Stmt(stmt)
+	defer txs.Close()
+	_, err = txs.Exec("Bobby", 7)
 	if err != nil {
 		t.Fatalf("Exec = %v", err)
 	}
@@ -330,6 +370,7 @@ func TestTxQuery(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
+	defer r.Close()
 
 	if !r.Next() {
 		if r.Err() != nil {
@@ -345,6 +386,22 @@ func TestTxQuery(t *testing.T) {
 	}
 }
 
+func TestTxQueryInvalid(t *testing.T) {
+	db := newTestDB(t, "")
+	defer closeDB(t, db)
+
+	tx, err := db.Begin()
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer tx.Rollback()
+
+	_, err = tx.Query("SELECT|t1|name|")
+	if err == nil {
+		t.Fatal("Error expected")
+	}
+}
+
 // Tests fix for issue 2542, that we release a lock when querying on
 // a closed connection.
 func TestIssue2542Deadlock(t *testing.T) {
@@ -450,48 +507,48 @@ type nullTestSpec struct {
 
 func TestNullStringParam(t *testing.T) {
 	spec := nullTestSpec{"nullstring", "string", [6]nullTestRow{
-		nullTestRow{NullString{"aqua", true}, "", NullString{"aqua", true}},
-		nullTestRow{NullString{"brown", false}, "", NullString{"", false}},
-		nullTestRow{"chartreuse", "", NullString{"chartreuse", true}},
-		nullTestRow{NullString{"darkred", true}, "", NullString{"darkred", true}},
-		nullTestRow{NullString{"eel", false}, "", NullString{"", false}},
-		nullTestRow{"foo", NullString{"black", false}, nil},
+		{NullString{"aqua", true}, "", NullString{"aqua", true}},
+		{NullString{"brown", false}, "", NullString{"", false}},
+		{"chartreuse", "", NullString{"chartreuse", true}},
+		{NullString{"darkred", true}, "", NullString{"darkred", true}},
+		{NullString{"eel", false}, "", NullString{"", false}},
+		{"foo", NullString{"black", false}, nil},
 	}}
 	nullTestRun(t, spec)
 }
 
 func TestNullInt64Param(t *testing.T) {
 	spec := nullTestSpec{"nullint64", "int64", [6]nullTestRow{
-		nullTestRow{NullInt64{31, true}, 1, NullInt64{31, true}},
-		nullTestRow{NullInt64{-22, false}, 1, NullInt64{0, false}},
-		nullTestRow{22, 1, NullInt64{22, true}},
-		nullTestRow{NullInt64{33, true}, 1, NullInt64{33, true}},
-		nullTestRow{NullInt64{222, false}, 1, NullInt64{0, false}},
-		nullTestRow{0, NullInt64{31, false}, nil},
+		{NullInt64{31, true}, 1, NullInt64{31, true}},
+		{NullInt64{-22, false}, 1, NullInt64{0, false}},
+		{22, 1, NullInt64{22, true}},
+		{NullInt64{33, true}, 1, NullInt64{33, true}},
+		{NullInt64{222, false}, 1, NullInt64{0, false}},
+		{0, NullInt64{31, false}, nil},
 	}}
 	nullTestRun(t, spec)
 }
 
 func TestNullFloat64Param(t *testing.T) {
 	spec := nullTestSpec{"nullfloat64", "float64", [6]nullTestRow{
-		nullTestRow{NullFloat64{31.2, true}, 1, NullFloat64{31.2, true}},
-		nullTestRow{NullFloat64{13.1, false}, 1, NullFloat64{0, false}},
-		nullTestRow{-22.9, 1, NullFloat64{-22.9, true}},
-		nullTestRow{NullFloat64{33.81, true}, 1, NullFloat64{33.81, true}},
-		nullTestRow{NullFloat64{222, false}, 1, NullFloat64{0, false}},
-		nullTestRow{10, NullFloat64{31.2, false}, nil},
+		{NullFloat64{31.2, true}, 1, NullFloat64{31.2, true}},
+		{NullFloat64{13.1, false}, 1, NullFloat64{0, false}},
+		{-22.9, 1, NullFloat64{-22.9, true}},
+		{NullFloat64{33.81, true}, 1, NullFloat64{33.81, true}},
+		{NullFloat64{222, false}, 1, NullFloat64{0, false}},
+		{10, NullFloat64{31.2, false}, nil},
 	}}
 	nullTestRun(t, spec)
 }
 
 func TestNullBoolParam(t *testing.T) {
 	spec := nullTestSpec{"nullbool", "bool", [6]nullTestRow{
-		nullTestRow{NullBool{false, true}, true, NullBool{false, true}},
-		nullTestRow{NullBool{true, false}, false, NullBool{false, false}},
-		nullTestRow{true, true, NullBool{true, true}},
-		nullTestRow{NullBool{true, true}, false, NullBool{true, true}},
-		nullTestRow{NullBool{true, false}, true, NullBool{false, false}},
-		nullTestRow{true, NullBool{true, false}, nil},
+		{NullBool{false, true}, true, NullBool{false, true}},
+		{NullBool{true, false}, false, NullBool{false, false}},
+		{true, true, NullBool{true, true}},
+		{NullBool{true, true}, false, NullBool{true, true}},
+		{NullBool{true, false}, true, NullBool{false, false}},
+		{true, NullBool{true, false}, nil},
 	}}
 	nullTestRun(t, spec)
 }
@@ -510,6 +567,7 @@ func nullTestRun(t *testing.T, spec nullTestSpec) {
 	if err != nil {
 		t.Fatalf("prepare: %v", err)
 	}
+	defer stmt.Close()
 	if _, err := stmt.Exec(3, "chris", spec.rows[2].nullParam, spec.rows[2].notNullParam); err != nil {
 		t.Errorf("exec insert chris: %v", err)
 	}
@@ -549,3 +607,8 @@ func nullTestRun(t *testing.T, spec nullTestSpec) {
 		}
 	}
 }
+
+func stack() string {
+	buf := make([]byte, 1024)
+	return string(buf[:runtime.Stack(buf, false)])
+}

libgo/go/encoding/asn1/asn1.go

@@ -250,10 +250,14 @@ func parseBase128Int(bytes []byte, initOffset int) (ret, offset int, err error)
 func parseUTCTime(bytes []byte) (ret time.Time, err error) {
 	s := string(bytes)
 	ret, err = time.Parse("0601021504Z0700", s)
-	if err == nil {
-		return
+	if err != nil {
+		ret, err = time.Parse("060102150405Z0700", s)
 	}
-	ret, err = time.Parse("060102150405Z0700", s)
+	if err == nil && ret.Year() >= 2050 {
+		// UTCTime only encodes times prior to 2050. See https://tools.ietf.org/html/rfc5280#section-4.1.2.5.1
+		ret = ret.AddDate(-100, 0, 0)
+	}
+
 	return
 }
 

libgo/go/encoding/asn1/asn1_test.go

@@ -321,7 +321,7 @@ var parseFieldParametersTestData []parseFieldParametersTest = []parseFieldParame
 	{"default:42", fieldParameters{defaultValue: newInt64(42)}},
 	{"tag:17", fieldParameters{tag: newInt(17)}},
 	{"optional,explicit,default:42,tag:17", fieldParameters{optional: true, explicit: true, defaultValue: newInt64(42), tag: newInt(17)}},
-	{"optional,explicit,default:42,tag:17,rubbish1", fieldParameters{true, true, false, newInt64(42), newInt(17), 0, false}},
+	{"optional,explicit,default:42,tag:17,rubbish1", fieldParameters{true, true, false, newInt64(42), newInt(17), 0, false, false}},
 	{"set", fieldParameters{set: true}},
 }
 

libgo/go/encoding/asn1/common.go

@@ -75,6 +75,7 @@ type fieldParameters struct {
 	tag          *int   // the EXPLICIT or IMPLICIT tag (maybe nil).
 	stringType   int    // the string tag to use when marshaling.
 	set          bool   // true iff this should be encoded as a SET
+	omitEmpty    bool   // true iff this should be omitted if empty when marshaling.
 
 	// Invariants:
 	//   if explicit is set, tag is non-nil.
@@ -116,6 +117,8 @@ func parseFieldParameters(str string) (ret fieldParameters) {
 			if ret.tag == nil {
 				ret.tag = new(int)
 			}
+		case part == "omitempty":
+			ret.omitEmpty = true
 		}
 	}
 	return

libgo/go/encoding/asn1/marshal.go

@@ -463,6 +463,10 @@ func marshalField(out *forkableWriter, v reflect.Value, params fieldParameters)
 		return marshalField(out, v.Elem(), params)
 	}
 
+	if v.Kind() == reflect.Slice && v.Len() == 0 && params.omitEmpty {
+		return
+	}
+
 	if params.optional && reflect.DeepEqual(v.Interface(), reflect.Zero(v.Type()).Interface()) {
 		return
 	}

libgo/go/encoding/asn1/marshal_test.go

@@ -54,6 +54,10 @@ type optionalRawValueTest struct {
 	A RawValue `asn1:"optional"`
 }
 
+type omitEmptyTest struct {
+	A []string `asn1:"omitempty"`
+}
+
 type testSET []int
 
 var PST = time.FixedZone("PST", -8*60*60)
@@ -116,6 +120,8 @@ var marshalTests = []marshalTest{
 	{rawContentsStruct{[]byte{0x30, 3, 1, 2, 3}, 64}, "3003010203"},
 	{RawValue{Tag: 1, Class: 2, IsCompound: false, Bytes: []byte{1, 2, 3}}, "8103010203"},
 	{testSET([]int{10}), "310302010a"},
+	{omitEmptyTest{[]string{}}, "3000"},
+	{omitEmptyTest{[]string{"1"}}, "30053003130131"},
 }
 
 func TestMarshal(t *testing.T) {

libgo/go/encoding/binary/binary.go

@@ -2,12 +2,17 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// Package binary implements translation between
-// unsigned integer values and byte sequences
-// and the reading and writing of fixed-size values.
+// Package binary implements translation between numbers and byte sequences
+// and encoding and decoding of varints.
+//
+// Numbers are translated by reading and writing fixed-size values.
 // A fixed-size value is either a fixed-size arithmetic
 // type (int8, uint8, int16, float32, complex64, ...)
 // or an array or struct containing only fixed-size values.
+//
+// Varints are a method of encoding integers using one or more bytes;
+// numbers with smaller absolute value take a smaller number of bytes.
+// For a specification, see http://code.google.com/apis/protocolbuffers/docs/encoding.html.
 package binary
 
 import (

libgo/go/encoding/csv/reader.go

@@ -92,7 +92,8 @@ var (
 // If FieldsPerRecord is positive, Read requires each record to
 // have the given number of fields.  If FieldsPerRecord is 0, Read sets it to
 // the number of fields in the first record, so that future records must
-// have the same field count.
+// have the same field count.  If FieldsPerRecord is negative, no check is
+// made and records may have a variable number of fields.
 //
 // If LazyQuotes is true, a quote may appear in an unquoted field and a
 // non-doubled quote may appear in a quoted field.

libgo/go/encoding/gob/decode.go

@@ -707,6 +707,9 @@ func (dec *Decoder) decodeInterface(ityp reflect.Type, state *decoderState, p ui
 	if name == "" {
 		// Copy the representation of the nil interface value to the target.
 		// This is horribly unsafe and special.
+		if indir > 0 {
+			p = allocate(ityp, p, 1) // All but the last level has been allocated by dec.Indirect
+		}
 		*(*[2]uintptr)(unsafe.Pointer(p)) = ivalue.InterfaceData()
 		return
 	}

libgo/go/encoding/gob/encoder_test.go

@@ -694,8 +694,8 @@ type Bug3 struct {
 
 func TestGobPtrSlices(t *testing.T) {
 	in := []*Bug3{
-		&Bug3{1, nil},
-		&Bug3{2, nil},
+		{1, nil},
+		{2, nil},
 	}
 	b := new(bytes.Buffer)
 	err := NewEncoder(b).Encode(&in)

libgo/go/encoding/gob/gobencdec_test.go

@@ -573,3 +573,22 @@ func TestGobEncodeIsZero(t *testing.T) {
 		t.Fatalf("%v != %v", x, y)
 	}
 }
+
+func TestGobEncodePtrError(t *testing.T) {
+	var err error
+	b := new(bytes.Buffer)
+	enc := NewEncoder(b)
+	err = enc.Encode(&err)
+	if err != nil {
+		t.Fatal("encode:", err)
+	}
+	dec := NewDecoder(b)
+	err2 := fmt.Errorf("foo")
+	err = dec.Decode(&err2)
+	if err != nil {
+		t.Fatal("decode:", err)
+	}
+	if err2 != nil {
+		t.Fatalf("expected nil, got %v", err2)
+	}
+}

libgo/go/encoding/json/encode.go

@@ -43,7 +43,8 @@ import (
 // to keep some browsers from misinterpreting JSON output as HTML.
 //
 // Array and slice values encode as JSON arrays, except that
-// []byte encodes as a base64-encoded string.
+// []byte encodes as a base64-encoded string, and a nil slice
+// encodes as the null JSON object.
 //
 // Struct values encode as JSON objects. Each exported struct field
 // becomes a member of the object unless

libgo/go/exp/norm/maketables.go

@@ -577,7 +577,7 @@ type decompSet [4]map[string]bool
 
 func makeDecompSet() decompSet {
 	m := decompSet{}
-	for i, _ := range m {
+	for i := range m {
 		m[i] = make(map[string]bool)
 	}
 	return m
@@ -646,7 +646,7 @@ func printCharInfoTables() int {
 	fmt.Println("const (")
 	for i, m := range decompSet {
 		sa := []string{}
-		for s, _ := range m {
+		for s := range m {
 			sa = append(sa, s)
 		}
 		sort.Strings(sa)

libgo/go/exp/wingui/gui.go

-// Copyright 2011 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.
-
-// +build windows
-
-package main
-
-import (
-	"fmt"
-	"os"
-	"syscall"
-	"unsafe"
-)
-
-// some help functions
-
-func abortf(format string, a ...interface{}) {
-	fmt.Fprintf(os.Stdout, format, a...)
-	os.Exit(1)
-}
-
-func abortErrNo(funcname string, err error) {
-	errno, _ := err.(syscall.Errno)
-	abortf("%s failed: %d %s\n", funcname, uint32(errno), err)
-}
-
-// global vars
-
-var (
-	mh syscall.Handle
-	bh syscall.Handle
-)
-
-// WinProc called by windows to notify us of all windows events we might be interested in.
-func WndProc(hwnd syscall.Handle, msg uint32, wparam, lparam uintptr) (rc uintptr) {
-	switch msg {
-	case WM_CREATE:
-		var e error
-		// CreateWindowEx
-		bh, e = CreateWindowEx(
-			0,
-			syscall.StringToUTF16Ptr("button"),
-			syscall.StringToUTF16Ptr("Quit"),
-			WS_CHILD|WS_VISIBLE|BS_DEFPUSHBUTTON,
-			75, 70, 140, 25,
-			hwnd, 1, mh, 0)
-		if e != nil {
-			abortErrNo("CreateWindowEx", e)
-		}
-		fmt.Printf("button handle is %x\n", bh)
-		rc = DefWindowProc(hwnd, msg, wparam, lparam)
-	case WM_COMMAND:
-		switch syscall.Handle(lparam) {
-		case bh:
-			e := PostMessage(hwnd, WM_CLOSE, 0, 0)
-			if e != nil {
-				abortErrNo("PostMessage", e)
-			}
-		default:
-			rc = DefWindowProc(hwnd, msg, wparam, lparam)
-		}
-	case WM_CLOSE:
-		DestroyWindow(hwnd)
-	case WM_DESTROY:
-		PostQuitMessage(0)
-	default:
-		rc = DefWindowProc(hwnd, msg, wparam, lparam)
-	}
-	//fmt.Printf("WndProc(0x%08x, %d, 0x%08x, 0x%08x) (%d)\n", hwnd, msg, wparam, lparam, rc)
-	return
-}
-
-func rungui() int {
-	var e error
-
-	// GetModuleHandle
-	mh, e = GetModuleHandle(nil)
-	if e != nil {
-		abortErrNo("GetModuleHandle", e)
-	}
-
-	// Get icon we're going to use.
-	myicon, e := LoadIcon(0, IDI_APPLICATION)
-	if e != nil {
-		abortErrNo("LoadIcon", e)
-	}
-
-	// Get cursor we're going to use.
-	mycursor, e := LoadCursor(0, IDC_ARROW)
-	if e != nil {
-		abortErrNo("LoadCursor", e)
-	}
-
-	// Create callback
-	wproc := syscall.NewCallback(WndProc)
-
-	// RegisterClassEx
-	wcname := syscall.StringToUTF16Ptr("myWindowClass")
-	var wc Wndclassex
-	wc.Size = uint32(unsafe.Sizeof(wc))
-	wc.WndProc = wproc
-	wc.Instance = mh
-	wc.Icon = myicon
-	wc.Cursor = mycursor
-	wc.Background = COLOR_BTNFACE + 1
-	wc.MenuName = nil
-	wc.ClassName = wcname
-	wc.IconSm = myicon
-	if _, e := RegisterClassEx(&wc); e != nil {
-		abortErrNo("RegisterClassEx", e)
-	}
-
-	// CreateWindowEx
-	wh, e := CreateWindowEx(
-		WS_EX_CLIENTEDGE,
-		wcname,
-		syscall.StringToUTF16Ptr("My window"),
-		WS_OVERLAPPEDWINDOW,
-		CW_USEDEFAULT, CW_USEDEFAULT, 300, 200,
-		0, 0, mh, 0)
-	if e != nil {
-		abortErrNo("CreateWindowEx", e)
-	}
-	fmt.Printf("main window handle is %x\n", wh)
-
-	// ShowWindow
-	ShowWindow(wh, SW_SHOWDEFAULT)
-
-	// UpdateWindow
-	if e := UpdateWindow(wh); e != nil {
-		abortErrNo("UpdateWindow", e)
-	}
-
-	// Process all windows messages until WM_QUIT.
-	var m Msg
-	for {
-		r, e := GetMessage(&m, 0, 0, 0)
-		if e != nil {
-			abortErrNo("GetMessage", e)
-		}
-		if r == 0 {
-			// WM_QUIT received -> get out
-			break
-		}
-		TranslateMessage(&m)
-		DispatchMessage(&m)
-	}
-	return int(m.Wparam)
-}
-
-func main() {
-	rc := rungui()
-	os.Exit(rc)
-}

libgo/go/exp/wingui/winapi.go

-// Copyright 2011 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.
-
-// +build windows
-
-package main
-
-import (
-	"syscall"
-	"unsafe"
-)
-
-type Wndclassex struct {
-	Size       uint32
-	Style      uint32
-	WndProc    uintptr
-	ClsExtra   int32
-	WndExtra   int32
-	Instance   syscall.Handle
-	Icon       syscall.Handle
-	Cursor     syscall.Handle
-	Background syscall.Handle
-	MenuName   *uint16
-	ClassName  *uint16
-	IconSm     syscall.Handle
-}
-
-type Point struct {
-	X uintptr
-	Y uintptr
-}
-
-type Msg struct {
-	Hwnd    syscall.Handle
-	Message uint32
-	Wparam  uintptr
-	Lparam  uintptr
-	Time    uint32
-	Pt      Point
-}
-
-const (
-	// Window styles
-	WS_OVERLAPPED   = 0
-	WS_POPUP        = 0x80000000
-	WS_CHILD        = 0x40000000
-	WS_MINIMIZE     = 0x20000000
-	WS_VISIBLE      = 0x10000000
-	WS_DISABLED     = 0x8000000
-	WS_CLIPSIBLINGS = 0x4000000
-	WS_CLIPCHILDREN = 0x2000000
-	WS_MAXIMIZE     = 0x1000000
-	WS_CAPTION      = WS_BORDER | WS_DLGFRAME
-	WS_BORDER       = 0x800000
-	WS_DLGFRAME     = 0x400000
-	WS_VSCROLL      = 0x200000
-	WS_HSCROLL      = 0x100000
-	WS_SYSMENU      = 0x80000
-	WS_THICKFRAME   = 0x40000
-	WS_GROUP        = 0x20000
-	WS_TABSTOP      = 0x10000
-	WS_MINIMIZEBOX  = 0x20000
-	WS_MAXIMIZEBOX  = 0x10000
-	WS_TILED        = WS_OVERLAPPED
-	WS_ICONIC       = WS_MINIMIZE
-	WS_SIZEBOX      = WS_THICKFRAME
-	// Common Window Styles
-	WS_OVERLAPPEDWINDOW = WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_THICKFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX
-	WS_TILEDWINDOW      = WS_OVERLAPPEDWINDOW
-	WS_POPUPWINDOW      = WS_POPUP | WS_BORDER | WS_SYSMENU
-	WS_CHILDWINDOW      = WS_CHILD
-
-	WS_EX_CLIENTEDGE = 0x200
-
-	// Some windows messages
-	WM_CREATE  = 1
-	WM_DESTROY = 2
-	WM_CLOSE   = 16
-	WM_COMMAND = 273
-
-	// Some button control styles
-	BS_DEFPUSHBUTTON = 1
-
-	// Some color constants
-	COLOR_WINDOW  = 5
-	COLOR_BTNFACE = 15
-
-	// Default window position
-	CW_USEDEFAULT = 0x80000000 - 0x100000000
-
-	// Show window default style
-	SW_SHOWDEFAULT = 10
-)
-
-var (
-	// Some globally known cursors
-	IDC_ARROW = MakeIntResource(32512)
-	IDC_IBEAM = MakeIntResource(32513)
-	IDC_WAIT  = MakeIntResource(32514)
-	IDC_CROSS = MakeIntResource(32515)
-
-	// Some globally known icons
-	IDI_APPLICATION = MakeIntResource(32512)
-	IDI_HAND        = MakeIntResource(32513)
-	IDI_QUESTION    = MakeIntResource(32514)
-	IDI_EXCLAMATION = MakeIntResource(32515)
-	IDI_ASTERISK    = MakeIntResource(32516)
-	IDI_WINLOGO     = MakeIntResource(32517)
-	IDI_WARNING     = IDI_EXCLAMATION
-	IDI_ERROR       = IDI_HAND
-	IDI_INFORMATION = IDI_ASTERISK
-)
-
-//sys	GetModuleHandle(modname *uint16) (handle syscall.Handle, err error) = GetModuleHandleW
-//sys	RegisterClassEx(wndclass *Wndclassex) (atom uint16, err error) = user32.RegisterClassExW
-//sys	CreateWindowEx(exstyle uint32, classname *uint16, windowname *uint16, style uint32, x int32, y int32, width int32, height int32, wndparent syscall.Handle, menu syscall.Handle, instance syscall.Handle, param uintptr) (hwnd syscall.Handle, err error) = user32.CreateWindowExW
-//sys	DefWindowProc(hwnd syscall.Handle, msg uint32, wparam uintptr, lparam uintptr) (lresult uintptr) = user32.DefWindowProcW
-//sys	DestroyWindow(hwnd syscall.Handle) (err error) = user32.DestroyWindow
-//sys	PostQuitMessage(exitcode int32) = user32.PostQuitMessage
-//sys	ShowWindow(hwnd syscall.Handle, cmdshow int32) (wasvisible bool) = user32.ShowWindow
-//sys	UpdateWindow(hwnd syscall.Handle) (err error) = user32.UpdateWindow
-//sys	GetMessage(msg *Msg, hwnd syscall.Handle, MsgFilterMin uint32, MsgFilterMax uint32) (ret int32, err error) [failretval==-1] = user32.GetMessageW
-//sys	TranslateMessage(msg *Msg) (done bool) = user32.TranslateMessage
-//sys	DispatchMessage(msg *Msg) (ret int32) = user32.DispatchMessageW
-//sys	LoadIcon(instance syscall.Handle, iconname *uint16) (icon syscall.Handle, err error) = user32.LoadIconW
-//sys	LoadCursor(instance syscall.Handle, cursorname *uint16) (cursor syscall.Handle, err error) = user32.LoadCursorW
-//sys	SetCursor(cursor syscall.Handle) (precursor syscall.Handle, err error) = user32.SetCursor
-//sys	SendMessage(hwnd syscall.Handle, msg uint32, wparam uintptr, lparam uintptr) (lresult uintptr) = user32.SendMessageW
-//sys	PostMessage(hwnd syscall.Handle, msg uint32, wparam uintptr, lparam uintptr) (err error) = user32.PostMessageW
-
-func MakeIntResource(id uint16) *uint16 {
-	return (*uint16)(unsafe.Pointer(uintptr(id)))
-}

libgo/go/exp/wingui/zwinapi.go

-// +build windows
-// mksyscall_windows.pl winapi.go
-// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
-
-package main
-
-import "unsafe"
-import "syscall"
-
-var (
-	modkernel32 = syscall.NewLazyDLL("kernel32.dll")
-	moduser32   = syscall.NewLazyDLL("user32.dll")
-
-	procGetModuleHandleW = modkernel32.NewProc("GetModuleHandleW")
-	procRegisterClassExW = moduser32.NewProc("RegisterClassExW")
-	procCreateWindowExW  = moduser32.NewProc("CreateWindowExW")
-	procDefWindowProcW   = moduser32.NewProc("DefWindowProcW")
-	procDestroyWindow    = moduser32.NewProc("DestroyWindow")
-	procPostQuitMessage  = moduser32.NewProc("PostQuitMessage")
-	procShowWindow       = moduser32.NewProc("ShowWindow")
-	procUpdateWindow     = moduser32.NewProc("UpdateWindow")
-	procGetMessageW      = moduser32.NewProc("GetMessageW")
-	procTranslateMessage = moduser32.NewProc("TranslateMessage")
-	procDispatchMessageW = moduser32.NewProc("DispatchMessageW")
-	procLoadIconW        = moduser32.NewProc("LoadIconW")
-	procLoadCursorW      = moduser32.NewProc("LoadCursorW")
-	procSetCursor        = moduser32.NewProc("SetCursor")
-	procSendMessageW     = moduser32.NewProc("SendMessageW")
-	procPostMessageW     = moduser32.NewProc("PostMessageW")
-)
-
-func GetModuleHandle(modname *uint16) (handle syscall.Handle, err error) {
-	r0, _, e1 := syscall.Syscall(procGetModuleHandleW.Addr(), 1, uintptr(unsafe.Pointer(modname)), 0, 0)
-	handle = syscall.Handle(r0)
-	if handle == 0 {
-		if e1 != 0 {
-			err = error(e1)
-		} else {
-			err = syscall.EINVAL
-		}
-	}
-	return
-}
-
-func RegisterClassEx(wndclass *Wndclassex) (atom uint16, err error) {
-	r0, _, e1 := syscall.Syscall(procRegisterClassExW.Addr(), 1, uintptr(unsafe.Pointer(wndclass)), 0, 0)
-	atom = uint16(r0)
-	if atom == 0 {
-		if e1 != 0 {
-			err = error(e1)
-		} else {
-			err = syscall.EINVAL
-		}
-	}
-	return
-}
-
-func CreateWindowEx(exstyle uint32, classname *uint16, windowname *uint16, style uint32, x int32, y int32, width int32, height int32, wndparent syscall.Handle, menu syscall.Handle, instance syscall.Handle, param uintptr) (hwnd syscall.Handle, err error) {
-	r0, _, e1 := syscall.Syscall12(procCreateWindowExW.Addr(), 12, uintptr(exstyle), uintptr(unsafe.Pointer(classname)), uintptr(unsafe.Pointer(windowname)), uintptr(style), uintptr(x), uintptr(y), uintptr(width), uintptr(height), uintptr(wndparent), uintptr(menu), uintptr(instance), uintptr(param))
-	hwnd = syscall.Handle(r0)
-	if hwnd == 0 {
-		if e1 != 0 {
-			err = error(e1)
-		} else {
-			err = syscall.EINVAL
-		}
-	}
-	return
-}
-
-func DefWindowProc(hwnd syscall.Handle, msg uint32, wparam uintptr, lparam uintptr) (lresult uintptr) {
-	r0, _, _ := syscall.Syscall6(procDefWindowProcW.Addr(), 4, uintptr(hwnd), uintptr(msg), uintptr(wparam), uintptr(lparam), 0, 0)
-	lresult = uintptr(r0)
-	return
-}
-
-func DestroyWindow(hwnd syscall.Handle) (err error) {
-	r1, _, e1 := syscall.Syscall(procDestroyWindow.Addr(), 1, uintptr(hwnd), 0, 0)
-	if int(r1) == 0 {
-		if e1 != 0 {
-			err = error(e1)
-		} else {
-			err = syscall.EINVAL
-		}
-	}
-	return
-}
-
-func PostQuitMessage(exitcode int32) {
-	syscall.Syscall(procPostQuitMessage.Addr(), 1, uintptr(exitcode), 0, 0)
-	return
-}
-
-func ShowWindow(hwnd syscall.Handle, cmdshow int32) (wasvisible bool) {
-	r0, _, _ := syscall.Syscall(procShowWindow.Addr(), 2, uintptr(hwnd), uintptr(cmdshow), 0)
-	wasvisible = bool(r0 != 0)
-	return
-}
-
-func UpdateWindow(hwnd syscall.Handle) (err error) {
-	r1, _, e1 := syscall.Syscall(procUpdateWindow.Addr(), 1, uintptr(hwnd), 0, 0)
-	if int(r1) == 0 {
-		if e1 != 0 {
-			err = error(e1)
-		} else {
-			err = syscall.EINVAL
-		}
-	}
-	return
-}
-
-func GetMessage(msg *Msg, hwnd syscall.Handle, MsgFilterMin uint32, MsgFilterMax uint32) (ret int32, err error) {
-	r0, _, e1 := syscall.Syscall6(procGetMessageW.Addr(), 4, uintptr(unsafe.Pointer(msg)), uintptr(hwnd), uintptr(MsgFilterMin), uintptr(MsgFilterMax), 0, 0)
-	ret = int32(r0)
-	if ret == -1 {
-		if e1 != 0 {
-			err = error(e1)
-		} else {
-			err = syscall.EINVAL
-		}
-	}
-	return
-}
-
-func TranslateMessage(msg *Msg) (done bool) {
-	r0, _, _ := syscall.Syscall(procTranslateMessage.Addr(), 1, uintptr(unsafe.Pointer(msg)), 0, 0)
-	done = bool(r0 != 0)
-	return
-}
-
-func DispatchMessage(msg *Msg) (ret int32) {
-	r0, _, _ := syscall.Syscall(procDispatchMessageW.Addr(), 1, uintptr(unsafe.Pointer(msg)), 0, 0)
-	ret = int32(r0)
-	return
-}
-
-func LoadIcon(instance syscall.Handle, iconname *uint16) (icon syscall.Handle, err error) {
-	r0, _, e1 := syscall.Syscall(procLoadIconW.Addr(), 2, uintptr(instance), uintptr(unsafe.Pointer(iconname)), 0)
-	icon = syscall.Handle(r0)
-	if icon == 0 {
-		if e1 != 0 {
-			err = error(e1)
-		} else {
-			err = syscall.EINVAL
-		}
-	}
-	return
-}
-
-func LoadCursor(instance syscall.Handle, cursorname *uint16) (cursor syscall.Handle, err error) {
-	r0, _, e1 := syscall.Syscall(procLoadCursorW.Addr(), 2, uintptr(instance), uintptr(unsafe.Pointer(cursorname)), 0)
-	cursor = syscall.Handle(r0)
-	if cursor == 0 {
-		if e1 != 0 {
-			err = error(e1)
-		} else {
-			err = syscall.EINVAL
-		}
-	}
-	return
-}
-
-func SetCursor(cursor syscall.Handle) (precursor syscall.Handle, err error) {
-	r0, _, e1 := syscall.Syscall(procSetCursor.Addr(), 1, uintptr(cursor), 0, 0)
-	precursor = syscall.Handle(r0)
-	if precursor == 0 {
-		if e1 != 0 {
-			err = error(e1)
-		} else {
-			err = syscall.EINVAL
-		}
-	}
-	return
-}
-
-func SendMessage(hwnd syscall.Handle, msg uint32, wparam uintptr, lparam uintptr) (lresult uintptr) {
-	r0, _, _ := syscall.Syscall6(procSendMessageW.Addr(), 4, uintptr(hwnd), uintptr(msg), uintptr(wparam), uintptr(lparam), 0, 0)
-	lresult = uintptr(r0)
-	return
-}
-
-func PostMessage(hwnd syscall.Handle, msg uint32, wparam uintptr, lparam uintptr) (err error) {
-	r1, _, e1 := syscall.Syscall6(procPostMessageW.Addr(), 4, uintptr(hwnd), uintptr(msg), uintptr(wparam), uintptr(lparam), 0, 0)
-	if int(r1) == 0 {
-		if e1 != 0 {
-			err = error(e1)
-		} else {
-			err = syscall.EINVAL
-		}
-	}
-	return
-}

libgo/go/expvar/expvar.go

@@ -41,10 +41,14 @@ type Var interface {
 // Int is a 64-bit integer variable that satisfies the Var interface.
 type Int struct {
 	i  int64
-	mu sync.Mutex
+	mu sync.RWMutex
 }
 
-func (v *Int) String() string { return strconv.FormatInt(v.i, 10) }
+func (v *Int) String() string {
+	v.mu.RLock()
+	defer v.mu.RUnlock()
+	return strconv.FormatInt(v.i, 10)
+}
 
 func (v *Int) Add(delta int64) {
 	v.mu.Lock()
@@ -61,10 +65,14 @@ func (v *Int) Set(value int64) {
 // Float is a 64-bit float variable that satisfies the Var interface.
 type Float struct {
 	f  float64
-	mu sync.Mutex
+	mu sync.RWMutex
 }
 
-func (v *Float) String() string { return strconv.FormatFloat(v.f, 'g', -1, 64) }
+func (v *Float) String() string {
+	v.mu.RLock()
+	defer v.mu.RUnlock()
+	return strconv.FormatFloat(v.f, 'g', -1, 64)
+}
 
 // Add adds delta to v.
 func (v *Float) Add(delta float64) {
@@ -95,17 +103,17 @@ type KeyValue struct {
 func (v *Map) String() string {
 	v.mu.RLock()
 	defer v.mu.RUnlock()
-	b := new(bytes.Buffer)
-	fmt.Fprintf(b, "{")
+	var b bytes.Buffer
+	fmt.Fprintf(&b, "{")
 	first := true
 	for key, val := range v.m {
 		if !first {
-			fmt.Fprintf(b, ", ")
+			fmt.Fprintf(&b, ", ")
 		}
-		fmt.Fprintf(b, "\"%s\": %v", key, val)
+		fmt.Fprintf(&b, "\"%s\": %v", key, val)
 		first = false
 	}
-	fmt.Fprintf(b, "}")
+	fmt.Fprintf(&b, "}")
 	return b.String()
 }
 
@@ -180,12 +188,21 @@ func (v *Map) Do(f func(KeyValue)) {
 
 // String is a string variable, and satisfies the Var interface.
 type String struct {
-	s string
+	s  string
+	mu sync.RWMutex
 }
 
-func (v *String) String() string { return strconv.Quote(v.s) }
+func (v *String) String() string {
+	v.mu.RLock()
+	defer v.mu.RUnlock()
+	return strconv.Quote(v.s)
+}
 
-func (v *String) Set(value string) { v.s = value }
+func (v *String) Set(value string) {
+	v.mu.Lock()
+	defer v.mu.Unlock()
+	v.s = value
+}
 
 // Func implements Var by calling the function
 // and formatting the returned value using JSON.

libgo/go/fmt/doc.go

@@ -7,7 +7,8 @@
 	to C's printf and scanf.  The format 'verbs' are derived from C's but
 	are simpler.
 
-	Printing:
+
+	Printing
 
 	The verbs:
 
@@ -127,7 +128,8 @@
 	by a single character (the verb) and end with a parenthesized
 	description.
 
-	Scanning:
+
+	Scanning
 
 	An analogous set of functions scans formatted text to yield
 	values.  Scan, Scanf and Scanln read from os.Stdin; Fscan,

libgo/go/fmt/export_test.go

+// Copyright 2012 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 fmt
+
+var IsSpace = isSpace

libgo/go/fmt/fmt_test.go

@@ -13,6 +13,7 @@ import (
 	"strings"
 	"testing"
 	"time"
+	"unicode"
 )
 
 type (
@@ -830,3 +831,13 @@ func TestBadVerbRecursion(t *testing.T) {
 		t.Error("fail with value")
 	}
 }
+
+func TestIsSpace(t *testing.T) {
+	// This tests the internal isSpace function.
+	// IsSpace = isSpace is defined in export_test.go.
+	for i := rune(0); i <= unicode.MaxRune; i++ {
+		if IsSpace(i) != unicode.IsSpace(i) {
+			t.Errorf("isSpace(%U) = %v, want %v", i, IsSpace(i), unicode.IsSpace(i))
+		}
+	}
+}

libgo/go/fmt/format.go

@@ -5,9 +5,7 @@
 package fmt
 
 import (
-	"bytes"
 	"strconv"
-	"unicode"
 	"unicode/utf8"
 )
 
@@ -36,10 +34,10 @@ func init() {
 }
 
 // A fmt is the raw formatter used by Printf etc.
-// It prints into a bytes.Buffer that must be set up externally.
+// It prints into a buffer that must be set up separately.
 type fmt struct {
 	intbuf [nByte]byte
-	buf    *bytes.Buffer
+	buf    *buffer
 	// width, precision
 	wid  int
 	prec int
@@ -69,7 +67,7 @@ func (f *fmt) clearflags() {
 	f.zero = false
 }
 
-func (f *fmt) init(buf *bytes.Buffer) {
+func (f *fmt) init(buf *buffer) {
 	f.buf = buf
 	f.clearflags()
 }
@@ -247,7 +245,7 @@ func (f *fmt) integer(a int64, base uint64, signedness bool, digits string) {
 	}
 
 	// If we want a quoted char for %#U, move the data up to make room.
-	if f.unicode && f.uniQuote && a >= 0 && a <= unicode.MaxRune && unicode.IsPrint(rune(a)) {
+	if f.unicode && f.uniQuote && a >= 0 && a <= utf8.MaxRune && strconv.IsPrint(rune(a)) {
 		runeWidth := utf8.RuneLen(rune(a))
 		width := 1 + 1 + runeWidth + 1 // space, quote, rune, quote
 		copy(buf[i-width:], buf[i:])   // guaranteed to have enough room.
@@ -290,16 +288,15 @@ func (f *fmt) fmt_s(s string) {
 // fmt_sx formats a string as a hexadecimal encoding of its bytes.
 func (f *fmt) fmt_sx(s, digits string) {
 	// TODO: Avoid buffer by pre-padding.
-	var b bytes.Buffer
+	var b []byte
 	for i := 0; i < len(s); i++ {
 		if i > 0 && f.space {
-			b.WriteByte(' ')
+			b = append(b, ' ')
 		}
 		v := s[i]
-		b.WriteByte(digits[v>>4])
-		b.WriteByte(digits[v&0xF])
+		b = append(b, digits[v>>4], digits[v&0xF])
 	}
-	f.pad(b.Bytes())
+	f.pad(b)
 }
 
 // fmt_q formats a string as a double-quoted, escaped Go string constant.

libgo/go/fmt/print.go

@@ -5,13 +5,11 @@
 package fmt
 
 import (
-	"bytes"
 	"errors"
 	"io"
 	"os"
 	"reflect"
 	"sync"
-	"unicode"
 	"unicode/utf8"
 )
 
@@ -71,11 +69,45 @@ type GoStringer interface {
 	GoString() string
 }
 
+// Use simple []byte instead of bytes.Buffer to avoid large dependency.
+type buffer []byte
+
+func (b *buffer) Write(p []byte) (n int, err error) {
+	*b = append(*b, p...)
+	return len(p), nil
+}
+
+func (b *buffer) WriteString(s string) (n int, err error) {
+	*b = append(*b, s...)
+	return len(s), nil
+}
+
+func (b *buffer) WriteByte(c byte) error {
+	*b = append(*b, c)
+	return nil
+}
+
+func (bp *buffer) WriteRune(r rune) error {
+	if r < utf8.RuneSelf {
+		*bp = append(*bp, byte(r))
+		return nil
+	}
+
+	b := *bp
+	n := len(b)
+	for n+utf8.UTFMax > cap(b) {
+		b = append(b, 0)
+	}
+	w := utf8.EncodeRune(b[n:n+utf8.UTFMax], r)
+	*bp = b[:n+w]
+	return nil
+}
+
 type pp struct {
 	n         int
 	panicking bool
 	erroring  bool // printing an error condition
-	buf       bytes.Buffer
+	buf       buffer
 	// field holds the current item, as an interface{}.
 	field interface{}
 	// value holds the current item, as a reflect.Value, and will be
@@ -133,10 +165,10 @@ func newPrinter() *pp {
 // Save used pp structs in ppFree; avoids an allocation per invocation.
 func (p *pp) free() {
 	// Don't hold on to pp structs with large buffers.
-	if cap(p.buf.Bytes()) > 1024 {
+	if cap(p.buf) > 1024 {
 		return
 	}
-	p.buf.Reset()
+	p.buf = p.buf[:0]
 	p.field = nil
 	p.value = reflect.Value{}
 	ppFree.put(p)
@@ -179,7 +211,7 @@ func (p *pp) Write(b []byte) (ret int, err error) {
 func Fprintf(w io.Writer, format string, a ...interface{}) (n int, err error) {
 	p := newPrinter()
 	p.doPrintf(format, a)
-	n64, err := p.buf.WriteTo(w)
+	n64, err := w.Write(p.buf)
 	p.free()
 	return int(n64), err
 }
@@ -194,7 +226,7 @@ func Printf(format string, a ...interface{}) (n int, err error) {
 func Sprintf(format string, a ...interface{}) string {
 	p := newPrinter()
 	p.doPrintf(format, a)
-	s := p.buf.String()
+	s := string(p.buf)
 	p.free()
 	return s
 }
@@ -213,7 +245,7 @@ func Errorf(format string, a ...interface{}) error {
 func Fprint(w io.Writer, a ...interface{}) (n int, err error) {
 	p := newPrinter()
 	p.doPrint(a, false, false)
-	n64, err := p.buf.WriteTo(w)
+	n64, err := w.Write(p.buf)
 	p.free()
 	return int(n64), err
 }
@@ -230,7 +262,7 @@ func Print(a ...interface{}) (n int, err error) {
 func Sprint(a ...interface{}) string {
 	p := newPrinter()
 	p.doPrint(a, false, false)
-	s := p.buf.String()
+	s := string(p.buf)
 	p.free()
 	return s
 }
@@ -245,7 +277,7 @@ func Sprint(a ...interface{}) string {
 func Fprintln(w io.Writer, a ...interface{}) (n int, err error) {
 	p := newPrinter()
 	p.doPrint(a, true, true)
-	n64, err := p.buf.WriteTo(w)
+	n64, err := w.Write(p.buf)
 	p.free()
 	return int(n64), err
 }
@@ -262,7 +294,7 @@ func Println(a ...interface{}) (n int, err error) {
 func Sprintln(a ...interface{}) string {
 	p := newPrinter()
 	p.doPrint(a, true, true)
-	s := p.buf.String()
+	s := string(p.buf)
 	p.free()
 	return s
 }
@@ -352,7 +384,7 @@ func (p *pp) fmtInt64(v int64, verb rune) {
 	case 'o':
 		p.fmt.integer(v, 8, signed, ldigits)
 	case 'q':
-		if 0 <= v && v <= unicode.MaxRune {
+		if 0 <= v && v <= utf8.MaxRune {
 			p.fmt.fmt_qc(v)
 		} else {
 			p.badVerb(verb)
@@ -416,7 +448,7 @@ func (p *pp) fmtUint64(v uint64, verb rune, goSyntax bool) {
 	case 'o':
 		p.fmt.integer(int64(v), 8, unsigned, ldigits)
 	case 'q':
-		if 0 <= v && v <= unicode.MaxRune {
+		if 0 <= v && v <= utf8.MaxRune {
 			p.fmt.fmt_qc(int64(v))
 		} else {
 			p.badVerb(verb)

libgo/go/fmt/scan.go

@@ -5,15 +5,12 @@
 package fmt
 
 import (
-	"bytes"
 	"errors"
 	"io"
 	"math"
 	"os"
 	"reflect"
 	"strconv"
-	"strings"
-	"unicode"
 	"unicode/utf8"
 )
 
@@ -87,25 +84,36 @@ func Scanf(format string, a ...interface{}) (n int, err error) {
 	return Fscanf(os.Stdin, format, a...)
 }
 
+type stringReader string
+
+func (r *stringReader) Read(b []byte) (n int, err error) {
+	n = copy(b, *r)
+	*r = (*r)[n:]
+	if n == 0 {
+		err = io.EOF
+	}
+	return
+}
+
 // Sscan scans the argument string, storing successive space-separated
 // values into successive arguments.  Newlines count as space.  It
 // returns the number of items successfully scanned.  If that is less
 // than the number of arguments, err will report why.
 func Sscan(str string, a ...interface{}) (n int, err error) {
-	return Fscan(strings.NewReader(str), a...)
+	return Fscan((*stringReader)(&str), a...)
 }
 
 // Sscanln is similar to Sscan, but stops scanning at a newline and
 // after the final item there must be a newline or EOF.
 func Sscanln(str string, a ...interface{}) (n int, err error) {
-	return Fscanln(strings.NewReader(str), a...)
+	return Fscanln((*stringReader)(&str), a...)
 }
 
 // Sscanf scans the argument string, storing successive space-separated
 // values into successive arguments as determined by the format.  It
 // returns the number of items successfully parsed.
 func Sscanf(str string, format string, a ...interface{}) (n int, err error) {
-	return Fscanf(strings.NewReader(str), format, a...)
+	return Fscanf((*stringReader)(&str), format, a...)
 }
 
 // Fscan scans text read from r, storing successive space-separated
@@ -149,7 +157,7 @@ const eof = -1
 // ss is the internal implementation of ScanState.
 type ss struct {
 	rr       io.RuneReader // where to read input
-	buf      bytes.Buffer  // token accumulator
+	buf      buffer        // token accumulator
 	peekRune rune          // one-rune lookahead
 	prevRune rune          // last rune returned by ReadRune
 	count    int           // runes consumed so far.
@@ -262,14 +270,46 @@ func (s *ss) Token(skipSpace bool, f func(rune) bool) (tok []byte, err error) {
 	if f == nil {
 		f = notSpace
 	}
-	s.buf.Reset()
+	s.buf = s.buf[:0]
 	tok = s.token(skipSpace, f)
 	return
 }
 
+// space is a copy of the unicode.White_Space ranges,
+// to avoid depending on package unicode.
+var space = [][2]uint16{
+	{0x0009, 0x000d},
+	{0x0020, 0x0020},
+	{0x0085, 0x0085},
+	{0x00a0, 0x00a0},
+	{0x1680, 0x1680},
+	{0x180e, 0x180e},
+	{0x2000, 0x200a},
+	{0x2028, 0x2029},
+	{0x202f, 0x202f},
+	{0x205f, 0x205f},
+	{0x3000, 0x3000},
+}
+
+func isSpace(r rune) bool {
+	if r >= 1<<16 {
+		return false
+	}
+	rx := uint16(r)
+	for _, rng := range space {
+		if rx < rng[0] {
+			return false
+		}
+		if rx <= rng[1] {
+			return true
+		}
+	}
+	return false
+}
+
 // notSpace is the default scanning function used in Token.
 func notSpace(r rune) bool {
-	return !unicode.IsSpace(r)
+	return !isSpace(r)
 }
 
 // skipSpace provides Scan() methods the ability to skip space and newline characters 
@@ -378,10 +418,10 @@ func (s *ss) free(old ssave) {
 		return
 	}
 	// Don't hold on to ss structs with large buffers.
-	if cap(s.buf.Bytes()) > 1024 {
+	if cap(s.buf) > 1024 {
 		return
 	}
-	s.buf.Reset()
+	s.buf = s.buf[:0]
 	s.rr = nil
 	ssFree.put(s)
 }
@@ -403,7 +443,7 @@ func (s *ss) skipSpace(stopAtNewline bool) {
 			s.errorString("unexpected newline")
 			return
 		}
-		if !unicode.IsSpace(r) {
+		if !isSpace(r) {
 			s.UnreadRune()
 			break
 		}
@@ -429,7 +469,7 @@ func (s *ss) token(skipSpace bool, f func(rune) bool) []byte {
 		}
 		s.buf.WriteRune(r)
 	}
-	return s.buf.Bytes()
+	return s.buf
 }
 
 // typeError indicates that the type of the operand did not match the format
@@ -440,6 +480,15 @@ func (s *ss) typeError(field interface{}, expected string) {
 var complexError = errors.New("syntax error scanning complex number")
 var boolError = errors.New("syntax error scanning boolean")
 
+func indexRune(s string, r rune) int {
+	for i, c := range s {
+		if c == r {
+			return i
+		}
+	}
+	return -1
+}
+
 // consume reads the next rune in the input and reports whether it is in the ok string.
 // If accept is true, it puts the character into the input token.
 func (s *ss) consume(ok string, accept bool) bool {
@@ -447,7 +496,7 @@ func (s *ss) consume(ok string, accept bool) bool {
 	if r == eof {
 		return false
 	}
-	if strings.IndexRune(ok, r) >= 0 {
+	if indexRune(ok, r) >= 0 {
 		if accept {
 			s.buf.WriteRune(r)
 		}
@@ -465,7 +514,7 @@ func (s *ss) peek(ok string) bool {
 	if r != eof {
 		s.UnreadRune()
 	}
-	return strings.IndexRune(ok, r) >= 0
+	return indexRune(ok, r) >= 0
 }
 
 func (s *ss) notEOF() {
@@ -560,7 +609,7 @@ func (s *ss) scanNumber(digits string, haveDigits bool) string {
 	}
 	for s.accept(digits) {
 	}
-	return s.buf.String()
+	return string(s.buf)
 }
 
 // scanRune returns the next rune value in the input.
@@ -660,16 +709,16 @@ func (s *ss) scanUint(verb rune, bitSize int) uint64 {
 // if the width is specified. It's not rigorous about syntax because it doesn't check that
 // we have at least some digits, but Atof will do that.
 func (s *ss) floatToken() string {
-	s.buf.Reset()
+	s.buf = s.buf[:0]
 	// NaN?
 	if s.accept("nN") && s.accept("aA") && s.accept("nN") {
-		return s.buf.String()
+		return string(s.buf)
 	}
 	// leading sign?
 	s.accept(sign)
 	// Inf?
 	if s.accept("iI") && s.accept("nN") && s.accept("fF") {
-		return s.buf.String()
+		return string(s.buf)
 	}
 	// digits?
 	for s.accept(decimalDigits) {
@@ -688,7 +737,7 @@ func (s *ss) floatToken() string {
 		for s.accept(decimalDigits) {
 		}
 	}
-	return s.buf.String()
+	return string(s.buf)
 }
 
 // complexTokens returns the real and imaginary parts of the complex number starting here.
@@ -698,13 +747,13 @@ func (s *ss) complexTokens() (real, imag string) {
 	// TODO: accept N and Ni independently?
 	parens := s.accept("(")
 	real = s.floatToken()
-	s.buf.Reset()
+	s.buf = s.buf[:0]
 	// Must now have a sign.
 	if !s.accept("+-") {
 		s.error(complexError)
 	}
 	// Sign is now in buffer
-	imagSign := s.buf.String()
+	imagSign := string(s.buf)
 	imag = s.floatToken()
 	if !s.accept("i") {
 		s.error(complexError)
@@ -717,7 +766,7 @@ func (s *ss) complexTokens() (real, imag string) {
 
 // convertFloat converts the string to a float64value.
 func (s *ss) convertFloat(str string, n int) float64 {
-	if p := strings.Index(str, "p"); p >= 0 {
+	if p := indexRune(str, 'p'); p >= 0 {
 		// Atof doesn't handle power-of-2 exponents,
 		// but they're easy to evaluate.
 		f, err := strconv.ParseFloat(str[:p], n)
@@ -794,7 +843,7 @@ func (s *ss) quotedString() string {
 			}
 			s.buf.WriteRune(r)
 		}
-		return s.buf.String()
+		return string(s.buf)
 	case '"':
 		// Double-quoted: Include the quotes and let strconv.Unquote do the backslash escapes.
 		s.buf.WriteRune(quote)
@@ -811,7 +860,7 @@ func (s *ss) quotedString() string {
 				break
 			}
 		}
-		result, err := strconv.Unquote(s.buf.String())
+		result, err := strconv.Unquote(string(s.buf))
 		if err != nil {
 			s.error(err)
 		}
@@ -844,7 +893,7 @@ func (s *ss) hexByte() (b byte, ok bool) {
 	if rune1 == eof {
 		return
 	}
-	if unicode.IsSpace(rune1) {
+	if isSpace(rune1) {
 		s.UnreadRune()
 		return
 	}
@@ -862,11 +911,11 @@ func (s *ss) hexString() string {
 		}
 		s.buf.WriteByte(b)
 	}
-	if s.buf.Len() == 0 {
+	if len(s.buf) == 0 {
 		s.errorString("Scan: no hex data for %x string")
 		return ""
 	}
-	return s.buf.String()
+	return string(s.buf)
 }
 
 const floatVerbs = "beEfFgGv"
@@ -875,7 +924,7 @@ const hugeWid = 1 << 30
 
 // scanOne scans a single value, deriving the scanner from the type of the argument.
 func (s *ss) scanOne(verb rune, field interface{}) {
-	s.buf.Reset()
+	s.buf = s.buf[:0]
 	var err error
 	// If the parameter has its own Scan method, use that.
 	if v, ok := field.(Scanner); ok {
@@ -1004,7 +1053,7 @@ func (s *ss) doScan(a []interface{}) (numProcessed int, err error) {
 			if r == '\n' || r == eof {
 				break
 			}
-			if !unicode.IsSpace(r) {
+			if !isSpace(r) {
 				s.errorString("Scan: expected newline")
 				break
 			}
@@ -1032,7 +1081,7 @@ func (s *ss) advance(format string) (i int) {
 			i += w // skip the first %
 		}
 		sawSpace := false
-		for unicode.IsSpace(fmtc) && i < len(format) {
+		for isSpace(fmtc) && i < len(format) {
 			sawSpace = true
 			i += w
 			fmtc, w = utf8.DecodeRuneInString(format[i:])
@@ -1044,7 +1093,7 @@ func (s *ss) advance(format string) (i int) {
 			if inputc == eof {
 				return
 			}
-			if !unicode.IsSpace(inputc) {
+			if !isSpace(inputc) {
 				// Space in format but not in input: error
 				s.errorString("expected space in input to match format")
 			}

libgo/go/go/build/build.go

@@ -34,7 +34,7 @@ type Context struct {
 	CgoEnabled  bool     // whether cgo can be used
 	BuildTags   []string // additional tags to recognize in +build lines
 	UseAllFiles bool     // use files regardless of +build lines, file names
-	Gccgo       bool     // assume use of gccgo when computing object paths
+	Compiler    string   // compiler to assume when computing target paths
 
 	// By default, Import uses the operating system's file system calls
 	// to read directories and files.  To read from other sources,
@@ -210,6 +210,7 @@ func (ctxt *Context) SrcDirs() []string {
 // if set, or else the compiled code's GOARCH, GOOS, and GOROOT.
 var Default Context = defaultContext()
 
+// This list is also known to ../../../cmd/dist/build.c.
 var cgoEnabled = map[string]bool{
 	"darwin/386":    true,
 	"darwin/amd64":  true,
@@ -228,6 +229,7 @@ func defaultContext() Context {
 	c.GOOS = envOr("GOOS", runtime.GOOS)
 	c.GOROOT = runtime.GOROOT()
 	c.GOPATH = envOr("GOPATH", "")
+	c.Compiler = runtime.Compiler
 
 	switch os.Getenv("CGO_ENABLED") {
 	case "1":
@@ -277,11 +279,12 @@ type Package struct {
 	PkgObj     string // installed .a file
 
 	// Source files
-	GoFiles  []string // .go source files (excluding CgoFiles, TestGoFiles, XTestGoFiles)
-	CgoFiles []string // .go source files that import "C"
-	CFiles   []string // .c source files
-	HFiles   []string // .h source files
-	SFiles   []string // .s source files
+	GoFiles   []string // .go source files (excluding CgoFiles, TestGoFiles, XTestGoFiles)
+	CgoFiles  []string // .go source files that import "C"
+	CFiles    []string // .c source files
+	HFiles    []string // .h source files
+	SFiles    []string // .s source files
+	SysoFiles []string // .syso system object files to add to archive
 
 	// Cgo directives
 	CgoPkgConfig []string // Cgo pkg-config directives
@@ -314,6 +317,16 @@ func (ctxt *Context) ImportDir(dir string, mode ImportMode) (*Package, error) {
 	return ctxt.Import(".", dir, mode)
 }
 
+// NoGoError is the error used by Import to describe a directory
+// containing no Go source files.
+type NoGoError struct {
+	Dir string
+}
+
+func (e *NoGoError) Error() string {
+	return "no Go source files in " + e.Dir
+}
+
 // Import returns details about the Go package named by the import path,
 // interpreting local import paths relative to the src directory.  If the path
 // is a local import path naming a package that can be imported using a
@@ -336,11 +349,16 @@ func (ctxt *Context) Import(path string, src string, mode ImportMode) (*Package,
 	}
 
 	var pkga string
-	if ctxt.Gccgo {
+	var pkgerr error
+	switch ctxt.Compiler {
+	case "gccgo":
 		dir, elem := pathpkg.Split(p.ImportPath)
 		pkga = "pkg/gccgo/" + dir + "lib" + elem + ".a"
-	} else {
+	case "gc":
 		pkga = "pkg/" + ctxt.GOOS + "_" + ctxt.GOARCH + "/" + p.ImportPath + ".a"
+	default:
+		// Save error for end of function.
+		pkgerr = fmt.Errorf("import %q: unknown compiler %q", path, ctxt.Compiler)
 	}
 
 	binaryOnly := false
@@ -396,7 +414,7 @@ func (ctxt *Context) Import(path string, src string, mode ImportMode) (*Package,
 		if ctxt.GOROOT != "" {
 			dir := ctxt.joinPath(ctxt.GOROOT, "src", "pkg", path)
 			isDir := ctxt.isDir(dir)
-			binaryOnly = !isDir && mode&AllowBinary != 0 && ctxt.isFile(ctxt.joinPath(ctxt.GOROOT, pkga))
+			binaryOnly = !isDir && mode&AllowBinary != 0 && pkga != "" && ctxt.isFile(ctxt.joinPath(ctxt.GOROOT, pkga))
 			if isDir || binaryOnly {
 				p.Dir = dir
 				p.Goroot = true
@@ -407,7 +425,7 @@ func (ctxt *Context) Import(path string, src string, mode ImportMode) (*Package,
 		for _, root := range ctxt.gopath() {
 			dir := ctxt.joinPath(root, "src", path)
 			isDir := ctxt.isDir(dir)
-			binaryOnly = !isDir && mode&AllowBinary != 0 && ctxt.isFile(ctxt.joinPath(root, pkga))
+			binaryOnly = !isDir && mode&AllowBinary != 0 && pkga != "" && ctxt.isFile(ctxt.joinPath(root, pkga))
 			if isDir || binaryOnly {
 				p.Dir = dir
 				p.Root = root
@@ -426,14 +444,16 @@ Found:
 		}
 		p.PkgRoot = ctxt.joinPath(p.Root, "pkg")
 		p.BinDir = ctxt.joinPath(p.Root, "bin")
-		p.PkgObj = ctxt.joinPath(p.Root, pkga)
+		if pkga != "" {
+			p.PkgObj = ctxt.joinPath(p.Root, pkga)
+		}
 	}
 
 	if mode&FindOnly != 0 {
-		return p, nil
+		return p, pkgerr
 	}
 	if binaryOnly && (mode&AllowBinary) != 0 {
-		return p, nil
+		return p, pkgerr
 	}
 
 	dirs, err := ctxt.readDir(p.Dir)
@@ -467,7 +487,13 @@ Found:
 		ext := name[i:]
 		switch ext {
 		case ".go", ".c", ".s", ".h", ".S":
-			// tentatively okay
+			// tentatively okay - read to make sure
+		case ".syso":
+			// binary objects to add to package archive
+			// Likely of the form foo_windows.syso, but
+			// the name was vetted above with goodOSArchFile.
+			p.SysoFiles = append(p.SysoFiles, name)
+			continue
 		default:
 			// skip
 			continue
@@ -586,7 +612,7 @@ Found:
 		}
 	}
 	if p.Name == "" {
-		return p, fmt.Errorf("no Go source files in %s", p.Dir)
+		return p, &NoGoError{p.Dir}
 	}
 
 	p.Imports, p.ImportPos = cleanImports(imported)
@@ -601,7 +627,7 @@ Found:
 		sort.Strings(p.SFiles)
 	}
 
-	return p, nil
+	return p, pkgerr
 }
 
 func cleanImports(m map[string][]token.Position) ([]string, map[string][]token.Position) {

libgo/go/go/parser/error_test.go

+// Copyright 2012 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.
+
+// This file implements a parser test harness. The files in the testdata
+// directory are parsed and the errors reported are compared against the
+// error messages expected in the test files. The test files must end in
+// .src rather than .go so that they are not disturbed by gofmt runs.
+//
+// Expected errors are indicated in the test files by putting a comment
+// of the form /* ERROR "rx" */ immediately following an offending token.
+// The harness will verify that an error matching the regular expression
+// rx is reported at that source position.
+//
+// For instance, the following test file indicates that a "not declared"
+// error should be reported for the undeclared variable x:
+//
+//	package p
+//	func f() {
+//		_ = x /* ERROR "not declared" */ + 1
+//	}
+
+package parser
+
+import (
+	"go/scanner"
+	"go/token"
+	"io/ioutil"
+	"path/filepath"
+	"regexp"
+	"strings"
+	"testing"
+)
+
+const testdata = "testdata"
+
+// getFile assumes that each filename occurs at most once
+func getFile(filename string) (file *token.File) {
+	fset.Iterate(func(f *token.File) bool {
+		if f.Name() == filename {
+			if file != nil {
+				panic(filename + " used multiple times")
+			}
+			file = f
+		}
+		return true
+	})
+	return file
+}
+
+func getPos(filename string, offset int) token.Pos {
+	if f := getFile(filename); f != nil {
+		return f.Pos(offset)
+	}
+	return token.NoPos
+}
+
+// ERROR comments must be of the form /* ERROR "rx" */ and rx is
+// a regular expression that matches the expected error message.
+//
+var errRx = regexp.MustCompile(`^/\* *ERROR *"([^"]*)" *\*/$`)
+
+// expectedErrors collects the regular expressions of ERROR comments found
+// in files and returns them as a map of error positions to error messages.
+//
+func expectedErrors(t *testing.T, filename string, src []byte) map[token.Pos]string {
+	errors := make(map[token.Pos]string)
+
+	var s scanner.Scanner
+	// file was parsed already - do not add it again to the file
+	// set otherwise the position information returned here will
+	// not match the position information collected by the parser
+	s.Init(getFile(filename), src, nil, scanner.ScanComments)
+	var prev token.Pos // position of last non-comment, non-semicolon token
+
+	for {
+		pos, tok, lit := s.Scan()
+		switch tok {
+		case token.EOF:
+			return errors
+		case token.COMMENT:
+			s := errRx.FindStringSubmatch(lit)
+			if len(s) == 2 {
+				errors[prev] = string(s[1])
+			}
+		default:
+			prev = pos
+		}
+	}
+
+	panic("unreachable")
+}
+
+// compareErrors compares the map of expected error messages with the list
+// of found errors and reports discrepancies.
+//
+func compareErrors(t *testing.T, expected map[token.Pos]string, found scanner.ErrorList) {
+	for _, error := range found {
+		// error.Pos is a token.Position, but we want
+		// a token.Pos so we can do a map lookup
+		pos := getPos(error.Pos.Filename, error.Pos.Offset)
+		if msg, found := expected[pos]; found {
+			// we expect a message at pos; check if it matches
+			rx, err := regexp.Compile(msg)
+			if err != nil {
+				t.Errorf("%s: %v", error.Pos, err)
+				continue
+			}
+			if match := rx.MatchString(error.Msg); !match {
+				t.Errorf("%s: %q does not match %q", error.Pos, error.Msg, msg)
+				continue
+			}
+			// we have a match - eliminate this error
+			delete(expected, pos)
+		} else {
+			// To keep in mind when analyzing failed test output:
+			// If the same error position occurs multiple times in errors,
+			// this message will be triggered (because the first error at
+			// the position removes this position from the expected errors).
+			t.Errorf("%s: unexpected error: %s", error.Pos, error.Msg)
+		}
+	}
+
+	// there should be no expected errors left
+	if len(expected) > 0 {
+		t.Errorf("%d errors not reported:", len(expected))
+		for pos, msg := range expected {
+			t.Errorf("%s: %s\n", fset.Position(pos), msg)
+		}
+	}
+}
+
+func checkErrors(t *testing.T, filename string, input interface{}) {
+	src, err := readSource(filename, input)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+
+	_, err = ParseFile(fset, filename, src, DeclarationErrors)
+	found, ok := err.(scanner.ErrorList)
+	if err != nil && !ok {
+		t.Error(err)
+		return
+	}
+
+	// we are expecting the following errors
+	// (collect these after parsing a file so that it is found in the file set)
+	expected := expectedErrors(t, filename, src)
+
+	// verify errors returned by the parser
+	compareErrors(t, expected, found)
+}
+
+func TestErrors(t *testing.T) {
+	list, err := ioutil.ReadDir(testdata)
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, fi := range list {
+		name := fi.Name()
+		if !fi.IsDir() && !strings.HasPrefix(name, ".") && strings.HasSuffix(name, ".src") {
+			checkErrors(t, filepath.Join(testdata, name), nil)
+		}
+	}
+}

libgo/go/go/parser/parser.go

@@ -40,6 +40,13 @@ type parser struct {
 	tok token.Token // one token look-ahead
 	lit string      // token literal
 
+	// Error recovery
+	// (used to limit the number of calls to syncXXX functions
+	// w/o making scanning progress - avoids potential endless
+	// loops across multiple parser functions during error recovery)
+	syncPos token.Pos // last synchronization position
+	syncCnt int       // number of calls to syncXXX without progress
+
 	// Non-syntactic parser control
 	exprLev int // < 0: in control clause, >= 0: in expression
 
@@ -362,18 +369,36 @@ func (p *parser) expect(tok token.Token) token.Pos {
 // expectClosing is like expect but provides a better error message
 // for the common case of a missing comma before a newline.
 //
-func (p *parser) expectClosing(tok token.Token, construct string) token.Pos {
+func (p *parser) expectClosing(tok token.Token, context string) token.Pos {
 	if p.tok != tok && p.tok == token.SEMICOLON && p.lit == "\n" {
-		p.error(p.pos, "missing ',' before newline in "+construct)
+		p.error(p.pos, "missing ',' before newline in "+context)
 		p.next()
 	}
 	return p.expect(tok)
 }
 
 func (p *parser) expectSemi() {
+	// semicolon is optional before a closing ')' or '}'
 	if p.tok != token.RPAREN && p.tok != token.RBRACE {
-		p.expect(token.SEMICOLON)
+		if p.tok == token.SEMICOLON {
+			p.next()
+		} else {
+			p.errorExpected(p.pos, "';'")
+			syncStmt(p)
+		}
+	}
+}
+
+func (p *parser) atComma(context string) bool {
+	if p.tok == token.COMMA {
+		return true
+	}
+	if p.tok == token.SEMICOLON && p.lit == "\n" {
+		p.error(p.pos, "missing ',' before newline in "+context)
+		return true // "insert" the comma and continue
+
 	}
+	return false
 }
 
 func assert(cond bool, msg string) {
@@ -382,6 +407,68 @@ func assert(cond bool, msg string) {
 	}
 }
 
+// syncStmt advances to the next statement.
+// Used for synchronization after an error.
+//
+func syncStmt(p *parser) {
+	for {
+		switch p.tok {
+		case token.BREAK, token.CONST, token.CONTINUE, token.DEFER,
+			token.FALLTHROUGH, token.FOR, token.GO, token.GOTO,
+			token.IF, token.RETURN, token.SELECT, token.SWITCH,
+			token.TYPE, token.VAR:
+			// Return only if parser made some progress since last
+			// sync or if it has not reached 10 sync calls without
+			// progress. Otherwise consume at least one token to
+			// avoid an endless parser loop (it is possible that
+			// both parseOperand and parseStmt call syncStmt and
+			// correctly do not advance, thus the need for the
+			// invocation limit p.syncCnt).
+			if p.pos == p.syncPos && p.syncCnt < 10 {
+				p.syncCnt++
+				return
+			}
+			if p.pos > p.syncPos {
+				p.syncPos = p.pos
+				p.syncCnt = 0
+				return
+			}
+			// Reaching here indicates a parser bug, likely an
+			// incorrect token list in this function, but it only
+			// leads to skipping of possibly correct code if a
+			// previous error is present, and thus is preferred
+			// over a non-terminating parse.
+		case token.EOF:
+			return
+		}
+		p.next()
+	}
+}
+
+// syncDecl advances to the next declaration.
+// Used for synchronization after an error.
+//
+func syncDecl(p *parser) {
+	for {
+		switch p.tok {
+		case token.CONST, token.TYPE, token.VAR:
+			// see comments in syncStmt
+			if p.pos == p.syncPos && p.syncCnt < 10 {
+				p.syncCnt++
+				return
+			}
+			if p.pos > p.syncPos {
+				p.syncPos = p.pos
+				p.syncCnt = 0
+				return
+			}
+		case token.EOF:
+			return
+		}
+		p.next()
+	}
+}
+
 // ----------------------------------------------------------------------------
 // Identifiers
 
@@ -522,9 +609,11 @@ func (p *parser) makeIdentList(list []ast.Expr) []*ast.Ident {
 	for i, x := range list {
 		ident, isIdent := x.(*ast.Ident)
 		if !isIdent {
-			pos := x.Pos()
-			p.errorExpected(pos, "identifier")
-			ident = &ast.Ident{NamePos: pos, Name: "_"}
+			if _, isBad := x.(*ast.BadExpr); !isBad {
+				// only report error if it's a new one
+				p.errorExpected(x.Pos(), "identifier")
+			}
+			ident = &ast.Ident{NamePos: x.Pos(), Name: "_"}
 		}
 		idents[i] = ident
 	}
@@ -688,7 +777,7 @@ func (p *parser) parseParameterList(scope *ast.Scope, ellipsisOk bool) (params [
 			// Go spec: The scope of an identifier denoting a function
 			// parameter or result variable is the function body.
 			p.declare(field, nil, scope, ast.Var, idents...)
-			if p.tok != token.COMMA {
+			if !p.atComma("parameter list") {
 				break
 			}
 			p.next()
@@ -991,19 +1080,19 @@ func (p *parser) parseOperand(lhs bool) ast.Expr {
 
 	case token.FUNC:
 		return p.parseFuncTypeOrLit()
+	}
 
-	default:
-		if typ := p.tryIdentOrType(true); typ != nil {
-			// could be type for composite literal or conversion
-			_, isIdent := typ.(*ast.Ident)
-			assert(!isIdent, "type cannot be identifier")
-			return typ
-		}
+	if typ := p.tryIdentOrType(true); typ != nil {
+		// could be type for composite literal or conversion
+		_, isIdent := typ.(*ast.Ident)
+		assert(!isIdent, "type cannot be identifier")
+		return typ
 	}
 
+	// we have an error
 	pos := p.pos
 	p.errorExpected(pos, "operand")
-	p.next() // make progress
+	syncStmt(p)
 	return &ast.BadExpr{From: pos, To: p.pos}
 }
 
@@ -1078,7 +1167,7 @@ func (p *parser) parseCallOrConversion(fun ast.Expr) *ast.CallExpr {
 			ellipsis = p.pos
 			p.next()
 		}
-		if p.tok != token.COMMA {
+		if !p.atComma("argument list") {
 			break
 		}
 		p.next()
@@ -1118,7 +1207,7 @@ func (p *parser) parseElementList() (list []ast.Expr) {
 
 	for p.tok != token.RBRACE && p.tok != token.EOF {
 		list = append(list, p.parseElement(true))
-		if p.tok != token.COMMA {
+		if !p.atComma("composite literal") {
 			break
 		}
 		p.next()
@@ -1262,8 +1351,8 @@ L:
 				x = p.parseTypeAssertion(p.checkExpr(x))
 			default:
 				pos := p.pos
-				p.next() // make progress
 				p.errorExpected(pos, "selector or type assertion")
+				p.next() // make progress
 				x = &ast.BadExpr{From: pos, To: p.pos}
 			}
 		case token.LBRACK:
@@ -1471,7 +1560,10 @@ func (p *parser) parseCallExpr() *ast.CallExpr {
 	if call, isCall := x.(*ast.CallExpr); isCall {
 		return call
 	}
-	p.errorExpected(x.Pos(), "function/method call")
+	if _, isBad := x.(*ast.BadExpr); !isBad {
+		// only report error if it's a new one
+		p.errorExpected(x.Pos(), "function/method call")
+	}
 	return nil
 }
 
@@ -1862,7 +1954,7 @@ func (p *parser) parseStmt() (s ast.Stmt) {
 
 	switch p.tok {
 	case token.CONST, token.TYPE, token.VAR:
-		s = &ast.DeclStmt{Decl: p.parseDecl()}
+		s = &ast.DeclStmt{Decl: p.parseDecl(syncStmt)}
 	case
 		// tokens that may start an expression
 		token.IDENT, token.INT, token.FLOAT, token.IMAG, token.CHAR, token.STRING, token.FUNC, token.LPAREN, // operands
@@ -1904,7 +1996,7 @@ func (p *parser) parseStmt() (s ast.Stmt) {
 		// no statement found
 		pos := p.pos
 		p.errorExpected(pos, "statement")
-		p.next() // make progress
+		syncStmt(p)
 		s = &ast.BadStmt{From: pos, To: p.pos}
 	}
 
@@ -2095,8 +2187,13 @@ func (p *parser) parseReceiver(scope *ast.Scope) *ast.FieldList {
 	recv := par.List[0]
 	base := deref(recv.Type)
 	if _, isIdent := base.(*ast.Ident); !isIdent {
-		p.errorExpected(base.Pos(), "(unqualified) identifier")
-		par.List = []*ast.Field{{Type: &ast.BadExpr{From: recv.Pos(), To: recv.End()}}}
+		if _, isBad := base.(*ast.BadExpr); !isBad {
+			// only report error if it's a new one
+			p.errorExpected(base.Pos(), "(unqualified) identifier")
+		}
+		par.List = []*ast.Field{
+			{Type: &ast.BadExpr{From: recv.Pos(), To: recv.End()}},
+		}
 	}
 
 	return par
@@ -2152,7 +2249,7 @@ func (p *parser) parseFuncDecl() *ast.FuncDecl {
 	return decl
 }
 
-func (p *parser) parseDecl() ast.Decl {
+func (p *parser) parseDecl(sync func(*parser)) ast.Decl {
 	if p.trace {
 		defer un(trace(p, "Declaration"))
 	}
@@ -2174,9 +2271,8 @@ func (p *parser) parseDecl() ast.Decl {
 	default:
 		pos := p.pos
 		p.errorExpected(pos, "declaration")
-		p.next() // make progress
-		decl := &ast.BadDecl{From: pos, To: p.pos}
-		return decl
+		sync(p)
+		return &ast.BadDecl{From: pos, To: p.pos}
 	}
 
 	return p.parseGenDecl(p.tok, f)
@@ -2215,7 +2311,7 @@ func (p *parser) parseFile() *ast.File {
 		if p.mode&ImportsOnly == 0 {
 			// rest of package body
 			for p.tok != token.EOF {
-				decls = append(decls, p.parseDecl())
+				decls = append(decls, p.parseDecl(syncDecl))
 			}
 		}
 	}

libgo/go/go/parser/parser_test.go

@@ -14,87 +14,14 @@ import (
 
 var fset = token.NewFileSet()
 
-var illegalInputs = []interface{}{
-	nil,
-	3.14,
-	[]byte(nil),
-	"foo!",
-	`package p; func f() { if /* should have condition */ {} };`,
-	`package p; func f() { if ; /* should have condition */ {} };`,
-	`package p; func f() { if f(); /* should have condition */ {} };`,
-	`package p; const c; /* should have constant value */`,
-	`package p; func f() { if _ = range x; true {} };`,
-	`package p; func f() { switch _ = range x; true {} };`,
-	`package p; func f() { for _ = range x ; ; {} };`,
-	`package p; func f() { for ; ; _ = range x {} };`,
-	`package p; func f() { for ; _ = range x ; {} };`,
-	`package p; func f() { switch t = t.(type) {} };`,
-	`package p; func f() { switch t, t = t.(type) {} };`,
-	`package p; func f() { switch t = t.(type), t {} };`,
-	`package p; var a = [1]int; /* illegal expression */`,
-	`package p; var a = [...]int; /* illegal expression */`,
-	`package p; var a = struct{} /* illegal expression */`,
-	`package p; var a = func(); /* illegal expression */`,
-	`package p; var a = interface{} /* illegal expression */`,
-	`package p; var a = []int /* illegal expression */`,
-	`package p; var a = map[int]int /* illegal expression */`,
-	`package p; var a = chan int; /* illegal expression */`,
-	`package p; var a = []int{[]int}; /* illegal expression */`,
-	`package p; var a = ([]int); /* illegal expression */`,
-	`package p; var a = a[[]int:[]int]; /* illegal expression */`,
-	`package p; var a = <- chan int; /* illegal expression */`,
-	`package p; func f() { select { case _ <- chan int: } };`,
-}
-
-func TestParseIllegalInputs(t *testing.T) {
-	for _, src := range illegalInputs {
-		_, err := ParseFile(fset, "", src, 0)
-		if err == nil {
-			t.Errorf("ParseFile(%v) should have failed", src)
-		}
-	}
-}
-
-var validPrograms = []string{
-	"package p\n",
-	`package p;`,
-	`package p; import "fmt"; func f() { fmt.Println("Hello, World!") };`,
-	`package p; func f() { if f(T{}) {} };`,
-	`package p; func f() { _ = (<-chan int)(x) };`,
-	`package p; func f() { _ = (<-chan <-chan int)(x) };`,
-	`package p; func f(func() func() func());`,
-	`package p; func f(...T);`,
-	`package p; func f(float, ...int);`,
-	`package p; func f(x int, a ...int) { f(0, a...); f(1, a...,) };`,
-	`package p; func f(int,) {};`,
-	`package p; func f(...int,) {};`,
-	`package p; func f(x ...int,) {};`,
-	`package p; type T []int; var a []bool; func f() { if a[T{42}[0]] {} };`,
-	`package p; type T []int; func g(int) bool { return true }; func f() { if g(T{42}[0]) {} };`,
-	`package p; type T []int; func f() { for _ = range []int{T{42}[0]} {} };`,
-	`package p; var a = T{{1, 2}, {3, 4}}`,
-	`package p; func f() { select { case <- c: case c <- d: case c <- <- d: case <-c <- d: } };`,
-	`package p; func f() { select { case x := (<-c): } };`,
-	`package p; func f() { if ; true {} };`,
-	`package p; func f() { switch ; {} };`,
-	`package p; func f() { for _ = range "foo" + "bar" {} };`,
-}
-
-func TestParseValidPrograms(t *testing.T) {
-	for _, src := range validPrograms {
-		_, err := ParseFile(fset, "", src, SpuriousErrors)
-		if err != nil {
-			t.Errorf("ParseFile(%q): %v", src, err)
-		}
-	}
-}
-
 var validFiles = []string{
 	"parser.go",
 	"parser_test.go",
+	"error_test.go",
+	"short_test.go",
 }
 
-func TestParse3(t *testing.T) {
+func TestParse(t *testing.T) {
 	for _, filename := range validFiles {
 		_, err := ParseFile(fset, filename, nil, DeclarationErrors)
 		if err != nil {
@@ -116,7 +43,7 @@ func nameFilter(filename string) bool {
 
 func dirFilter(f os.FileInfo) bool { return nameFilter(f.Name()) }
 
-func TestParse4(t *testing.T) {
+func TestParseDir(t *testing.T) {
 	path := "."
 	pkgs, err := ParseDir(fset, path, dirFilter, 0)
 	if err != nil {
@@ -158,7 +85,7 @@ func TestParseExpr(t *testing.T) {
 	}
 
 	// it must not crash
-	for _, src := range validPrograms {
+	for _, src := range valids {
 		ParseExpr(src)
 	}
 }

libgo/go/go/parser/short_test.go

+// Copyright 2009 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.
+
+// This file contains test cases for short valid and invalid programs.
+
+package parser
+
+import "testing"
+
+var valids = []string{
+	"package p\n",
+	`package p;`,
+	`package p; import "fmt"; func f() { fmt.Println("Hello, World!") };`,
+	`package p; func f() { if f(T{}) {} };`,
+	`package p; func f() { _ = (<-chan int)(x) };`,
+	`package p; func f() { _ = (<-chan <-chan int)(x) };`,
+	`package p; func f(func() func() func());`,
+	`package p; func f(...T);`,
+	`package p; func f(float, ...int);`,
+	`package p; func f(x int, a ...int) { f(0, a...); f(1, a...,) };`,
+	`package p; func f(int,) {};`,
+	`package p; func f(...int,) {};`,
+	`package p; func f(x ...int,) {};`,
+	`package p; type T []int; var a []bool; func f() { if a[T{42}[0]] {} };`,
+	`package p; type T []int; func g(int) bool { return true }; func f() { if g(T{42}[0]) {} };`,
+	`package p; type T []int; func f() { for _ = range []int{T{42}[0]} {} };`,
+	`package p; var a = T{{1, 2}, {3, 4}}`,
+	`package p; func f() { select { case <- c: case c <- d: case c <- <- d: case <-c <- d: } };`,
+	`package p; func f() { select { case x := (<-c): } };`,
+	`package p; func f() { if ; true {} };`,
+	`package p; func f() { switch ; {} };`,
+	`package p; func f() { for _ = range "foo" + "bar" {} };`,
+}
+
+func TestValid(t *testing.T) {
+	for _, src := range valids {
+		checkErrors(t, src, src)
+	}
+}
+
+var invalids = []string{
+	`foo /* ERROR "expected 'package'" */ !`,
+	`package p; func f() { if { /* ERROR "expected operand" */ } };`,
+	`package p; func f() { if ; { /* ERROR "expected operand" */ } };`,
+	`package p; func f() { if f(); { /* ERROR "expected operand" */ } };`,
+	`package p; const c; /* ERROR "expected '='" */`,
+	`package p; func f() { if _ /* ERROR "expected condition" */ = range x; true {} };`,
+	`package p; func f() { switch _ /* ERROR "expected condition" */ = range x; true {} };`,
+	`package p; func f() { for _ = range x ; /* ERROR "expected '{'" */ ; {} };`,
+	`package p; func f() { for ; ; _ = range /* ERROR "expected operand" */ x {} };`,
+	`package p; func f() { for ; _ /* ERROR "expected condition" */ = range x ; {} };`,
+	`package p; func f() { switch t /* ERROR "expected condition" */ = t.(type) {} };`,
+	`package p; func f() { switch t /* ERROR "expected condition" */ , t = t.(type) {} };`,
+	`package p; func f() { switch t /* ERROR "expected condition" */ = t.(type), t {} };`,
+	`package p; var a = [ /* ERROR "expected expression" */ 1]int;`,
+	`package p; var a = [ /* ERROR "expected expression" */ ...]int;`,
+	`package p; var a = struct /* ERROR "expected expression" */ {}`,
+	`package p; var a = func /* ERROR "expected expression" */ ();`,
+	`package p; var a = interface /* ERROR "expected expression" */ {}`,
+	`package p; var a = [ /* ERROR "expected expression" */ ]int`,
+	`package p; var a = map /* ERROR "expected expression" */ [int]int`,
+	`package p; var a = chan /* ERROR "expected expression" */ int;`,
+	`package p; var a = []int{[ /* ERROR "expected expression" */ ]int};`,
+	`package p; var a = ( /* ERROR "expected expression" */ []int);`,
+	`package p; var a = a[[ /* ERROR "expected expression" */ ]int:[]int];`,
+	`package p; var a = <-  /* ERROR "expected expression" */ chan int;`,
+	`package p; func f() { select { case _ <- chan  /* ERROR "expected expression" */ int: } };`,
+}
+
+func TestInvalid(t *testing.T) {
+	for _, src := range invalids {
+		checkErrors(t, src, src)
+	}
+}

libgo/go/go/parser/testdata/commas.src

+// Copyright 2012 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.
+
+// Test case for error messages/parser synchronization
+// after missing commas.
+
+package p
+
+var _ = []int{
+	0 /* ERROR "missing ','" */
+}
+
+var _ = []int{
+	0,
+	1,
+	2,
+	3 /* ERROR "missing ','" */
+}

libgo/go/go/parser/testdata/issue3106.src

+// Copyright 2012 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.
+
+// Test case for issue 3106: Better synchronization of
+// parser after certain syntax errors.
+
+package main
+
+func f() {
+	var m Mutex
+	c := MakeCond(&m)
+	percent := 0
+	const step = 10
+	for i := 0; i < 5; i++ {
+		go func() {
+			for {
+				// Emulates some useful work.
+				time.Sleep(1e8)
+				m.Lock()
+				defer
+				if /* ERROR "expected operand, found 'if'" */ percent == 100 {
+					m.Unlock()
+					break
+				}
+				percent++
+				if percent % step == 0 {
+					//c.Signal()
+				}
+				m.Unlock()
+			}
+		}()
+	}
+	for {
+		m.Lock()
+		if percent == 0 || percent % step != 0 {
+			c.Wait()
+		}
+		fmt.Print(",")
+		if percent == 100 {
+			m.Unlock()
+			break
+		}
+		m.Unlock()
+	}
+}

libgo/go/go/printer/nodes.go

@@ -15,7 +15,7 @@ import (
 	"unicode/utf8"
 )
 
-// Other formatting issues:
+// Formatting issues:
 // - better comment formatting for /*-style comments at the end of a line (e.g. a declaration)
 //   when the comment spans multiple lines; if such a comment is just two lines, formatting is
 //   not idempotent
@@ -964,6 +964,41 @@ func (p *printer) controlClause(isForStmt bool, init ast.Stmt, expr ast.Expr, po
 	}
 }
 
+// indentList reports whether an expression list would look better if it
+// were indented wholesale (starting with the very first element, rather
+// than starting at the first line break).
+//
+func (p *printer) indentList(list []ast.Expr) bool {
+	// Heuristic: indentList returns true if there are more than one multi-
+	// line element in the list, or if there is any element that is not
+	// starting on the same line as the previous one ends.
+	if len(list) >= 2 {
+		var b = p.lineFor(list[0].Pos())
+		var e = p.lineFor(list[len(list)-1].End())
+		if 0 < b && b < e {
+			// list spans multiple lines
+			n := 0 // multi-line element count
+			line := b
+			for _, x := range list {
+				xb := p.lineFor(x.Pos())
+				xe := p.lineFor(x.End())
+				if line < xb {
+					// x is not starting on the same
+					// line as the previous one ended
+					return true
+				}
+				if xb < xe {
+					// x is a multi-line element
+					n++
+				}
+				line = xe
+			}
+			return n > 1
+		}
+	}
+	return false
+}
+
 func (p *printer) stmt(stmt ast.Stmt, nextIsRBrace bool) {
 	p.print(stmt.Pos())
 
@@ -1030,7 +1065,18 @@ func (p *printer) stmt(stmt ast.Stmt, nextIsRBrace bool) {
 		p.print(token.RETURN)
 		if s.Results != nil {
 			p.print(blank)
-			p.exprList(s.Pos(), s.Results, 1, 0, token.NoPos)
+			// Use indentList heuristic to make corner cases look
+			// better (issue 1207). A more systematic approach would
+			// always indent, but this would cause significant
+			// reformatting of the code base and not necessarily
+			// lead to more nicely formatted code in general.
+			if p.indentList(s.Results) {
+				p.print(indent)
+				p.exprList(s.Pos(), s.Results, 1, noIndent, token.NoPos)
+				p.print(unindent)
+			} else {
+				p.exprList(s.Pos(), s.Results, 1, 0, token.NoPos)
+			}
 		}
 
 	case *ast.BranchStmt:
@@ -1200,9 +1246,9 @@ func keepTypeColumn(specs []ast.Spec) []bool {
 	return m
 }
 
-func (p *printer) valueSpec(s *ast.ValueSpec, keepType, doIndent bool) {
+func (p *printer) valueSpec(s *ast.ValueSpec, keepType bool) {
 	p.setComment(s.Doc)
-	p.identList(s.Names, doIndent) // always present
+	p.identList(s.Names, false) // always present
 	extraTabs := 3
 	if s.Type != nil || keepType {
 		p.print(vtab)
@@ -1290,7 +1336,7 @@ func (p *printer) genDecl(d *ast.GenDecl) {
 					if i > 0 {
 						p.linebreak(p.lineFor(s.Pos()), 1, ignore, newSection)
 					}
-					p.valueSpec(s.(*ast.ValueSpec), keepType[i], false)
+					p.valueSpec(s.(*ast.ValueSpec), keepType[i])
 					newSection = p.isMultiLine(s)
 				}
 			} else {

libgo/go/go/printer/testdata/statements.golden

@@ -55,12 +55,24 @@ func _f() {
 	return T{
 		1,
 		2,
-	},
+	}, nil
+	return T{
+			1,
+			2,
+		},
+		T{
+			x:	3,
+			y:	4,
+		}, nil
+	return T{
+			1,
+			2,
+		},
 		nil
 	return T{
-		1,
-		2,
-	},
+			1,
+			2,
+		},
 		T{
 			x:	3,
 			y:	4,
@@ -70,10 +82,10 @@ func _f() {
 		z
 	return func() {}
 	return func() {
-		_ = 0
-	}, T{
-		1, 2,
-	}
+			_ = 0
+		}, T{
+			1, 2,
+		}
 	return func() {
 		_ = 0
 	}
@@ -84,6 +96,37 @@ func _f() {
 	}
 }
 
+// Formatting of multi-line returns: test cases from issue 1207.
+func F() (*T, os.Error) {
+	return &T{
+			X:	1,
+			Y:	2,
+		},
+		nil
+}
+
+func G() (*T, *T, os.Error) {
+	return &T{
+			X:	1,
+			Y:	2,
+		},
+		&T{
+			X:	3,
+			Y:	4,
+		},
+		nil
+}
+
+func _() interface{} {
+	return &fileStat{
+		name:		basename(file.name),
+		size:		mkSize(d.FileSizeHigh, d.FileSizeLow),
+		modTime:	mkModTime(d.LastWriteTime),
+		mode:		mkMode(d.FileAttributes),
+		sys:		mkSysFromFI(&d),
+	}, nil
+}
+
 // Formatting of if-statement headers.
 func _() {
 	if true {

libgo/go/go/printer/testdata/statements.input

@@ -55,6 +55,18 @@ func _f() {
 	return T{
 			1,
 			2,
+		}, nil
+	return T{
+			1,
+			2,
+		},
+		T{
+			x: 3,
+			y: 4,
+		}, nil
+	return T{
+			1,
+			2,
 		},
 		nil
 	return T{
@@ -84,6 +96,37 @@ func _f() {
 	}
 }
 
+// Formatting of multi-line returns: test cases from issue 1207.
+func F() (*T, os.Error) {
+       return &T{
+               X: 1,
+               Y: 2,
+       },
+               nil
+}
+
+func G() (*T, *T, os.Error) {
+       return &T{
+               X: 1,
+               Y: 2,
+       },
+               &T{
+                       X: 3,
+                       Y: 4,
+               },
+               nil
+}
+
+func _() interface{} {
+	return &fileStat{
+			name:    basename(file.name),
+			size:    mkSize(d.FileSizeHigh, d.FileSizeLow),
+			modTime: mkModTime(d.LastWriteTime),
+			mode:    mkMode(d.FileAttributes),
+			sys:     mkSysFromFI(&d),
+		}, nil
+}
+
 // Formatting of if-statement headers.
 func _() {
 	if true {}

libgo/go/go/scanner/scanner.go

@@ -109,7 +109,7 @@ const (
 func (s *Scanner) Init(file *token.File, src []byte, err ErrorHandler, mode Mode) {
 	// Explicitly initialize all fields since a scanner may be reused.
 	if file.Size() != len(src) {
-		panic("file size does not match src len")
+		panic(fmt.Sprintf("file size (%d) does not match src len (%d)", file.Size(), len(src)))
 	}
 	s.file = file
 	s.dir, _ = filepath.Split(file.Name())

libgo/go/html/template/doc.go

@@ -29,7 +29,7 @@ can be safely embedded in an HTML document. The escaping is contextual, so
 actions can appear within JavaScript, CSS, and URI contexts.
 
 The security model used by this package assumes that template authors are
-trusted, while text/template Execute's data parameter is not. More details are
+trusted, while Execute's data parameter is not. More details are
 provided below.
 
 Example

libgo/go/io/io.go

@@ -173,6 +173,13 @@ type ReaderAt interface {
 // at offset off.  It returns the number of bytes written from p (0 <= n <= len(p))
 // and any error encountered that caused the write to stop early.
 // WriteAt must return a non-nil error if it returns n < len(p).
+//
+// If WriteAt is writing to a destination with a seek offset,
+// WriteAt should not affect nor be affected by the underlying
+// seek offset.
+//
+// Clients of WriteAt can execute parallel WriteAt calls on the same
+// destination if the ranges do not overlap.
 type WriterAt interface {
 	WriteAt(p []byte, off int64) (n int, err error)
 }

libgo/go/log/log.go

@@ -13,8 +13,6 @@
 package log
 
 import (
-	"bytes"
-	_ "debug/elf"
 	"fmt"
 	"io"
 	"os"
@@ -29,7 +27,7 @@ const (
 	// order they appear (the order listed here) or the format they present (as
 	// described in the comments).  A colon appears after these items:
 	//	2009/0123 01:23:23.123123 /a/b/c/d.go:23: message
-	Ldate         = 1 << iota     // the date: 2009/0123
+	Ldate         = 1 << iota     // the date: 2009/01/23
 	Ltime                         // the time: 01:23:23
 	Lmicroseconds                 // microsecond resolution: 01:23:23.123123.  assumes Ltime.
 	Llongfile                     // full file name and line number: /a/b/c/d.go:23
@@ -42,11 +40,11 @@ const (
 // the Writer's Write method.  A Logger can be used simultaneously from
 // multiple goroutines; it guarantees to serialize access to the Writer.
 type Logger struct {
-	mu     sync.Mutex   // ensures atomic writes; protects the following fields
-	prefix string       // prefix to write at beginning of each line
-	flag   int          // properties
-	out    io.Writer    // destination for output
-	buf    bytes.Buffer // for accumulating text to write
+	mu     sync.Mutex // ensures atomic writes; protects the following fields
+	prefix string     // prefix to write at beginning of each line
+	flag   int        // properties
+	out    io.Writer  // destination for output
+	buf    []byte     // for accumulating text to write
 }
 
 // New creates a new Logger.   The out variable sets the
@@ -61,10 +59,10 @@ var std = New(os.Stderr, "", LstdFlags)
 
 // Cheap integer to fixed-width decimal ASCII.  Give a negative width to avoid zero-padding.
 // Knows the buffer has capacity.
-func itoa(buf *bytes.Buffer, i int, wid int) {
+func itoa(buf *[]byte, i int, wid int) {
 	var u uint = uint(i)
 	if u == 0 && wid <= 1 {
-		buf.WriteByte('0')
+		*buf = append(*buf, '0')
 		return
 	}
 
@@ -76,38 +74,33 @@ func itoa(buf *bytes.Buffer, i int, wid int) {
 		wid--
 		b[bp] = byte(u%10) + '0'
 	}
-
-	// avoid slicing b to avoid an allocation.
-	for bp < len(b) {
-		buf.WriteByte(b[bp])
-		bp++
-	}
+	*buf = append(*buf, b[bp:]...)
 }
 
-func (l *Logger) formatHeader(buf *bytes.Buffer, t time.Time, file string, line int) {
-	buf.WriteString(l.prefix)
+func (l *Logger) formatHeader(buf *[]byte, t time.Time, file string, line int) {
+	*buf = append(*buf, l.prefix...)
 	if l.flag&(Ldate|Ltime|Lmicroseconds) != 0 {
 		if l.flag&Ldate != 0 {
 			year, month, day := t.Date()
 			itoa(buf, year, 4)
-			buf.WriteByte('/')
+			*buf = append(*buf, '/')
 			itoa(buf, int(month), 2)
-			buf.WriteByte('/')
+			*buf = append(*buf, '/')
 			itoa(buf, day, 2)
-			buf.WriteByte(' ')
+			*buf = append(*buf, ' ')
 		}
 		if l.flag&(Ltime|Lmicroseconds) != 0 {
 			hour, min, sec := t.Clock()
 			itoa(buf, hour, 2)
-			buf.WriteByte(':')
+			*buf = append(*buf, ':')
 			itoa(buf, min, 2)
-			buf.WriteByte(':')
+			*buf = append(*buf, ':')
 			itoa(buf, sec, 2)
 			if l.flag&Lmicroseconds != 0 {
-				buf.WriteByte('.')
+				*buf = append(*buf, '.')
 				itoa(buf, t.Nanosecond()/1e3, 6)
 			}
-			buf.WriteByte(' ')
+			*buf = append(*buf, ' ')
 		}
 	}
 	if l.flag&(Lshortfile|Llongfile) != 0 {
@@ -121,10 +114,10 @@ func (l *Logger) formatHeader(buf *bytes.Buffer, t time.Time, file string, line
 			}
 			file = short
 		}
-		buf.WriteString(file)
-		buf.WriteByte(':')
+		*buf = append(*buf, file...)
+		*buf = append(*buf, ':')
 		itoa(buf, line, -1)
-		buf.WriteString(": ")
+		*buf = append(*buf, ": "...)
 	}
 }
 
@@ -151,13 +144,13 @@ func (l *Logger) Output(calldepth int, s string) error {
 		}
 		l.mu.Lock()
 	}
-	l.buf.Reset()
+	l.buf = l.buf[:0]
 	l.formatHeader(&l.buf, now, file, line)
-	l.buf.WriteString(s)
+	l.buf = append(l.buf, s...)
 	if len(s) > 0 && s[len(s)-1] != '\n' {
-		l.buf.WriteByte('\n')
+		l.buf = append(l.buf, '\n')
 	}
-	_, err := l.out.Write(l.buf.Bytes())
+	_, err := l.out.Write(l.buf)
 	return err
 }
 

libgo/go/net/dial_test.go

@@ -6,6 +6,7 @@ package net
 
 import (
 	"flag"
+	"fmt"
 	"regexp"
 	"runtime"
 	"testing"
@@ -32,7 +33,7 @@ func TestDialTimeout(t *testing.T) {
 	numConns := listenerBacklog + 10
 
 	// TODO(bradfitz): It's hard to test this in a portable
-	// way. This is unforunate, but works for now.
+	// way. This is unfortunate, but works for now.
 	switch runtime.GOOS {
 	case "linux":
 		// The kernel will start accepting TCP connections before userspace
@@ -44,13 +45,25 @@ func TestDialTimeout(t *testing.T) {
 				errc <- err
 			}()
 		}
-	case "darwin":
+	case "darwin", "windows":
 		// At least OS X 10.7 seems to accept any number of
 		// connections, ignoring listen's backlog, so resort
 		// to connecting to a hopefully-dead 127/8 address.
 		// Same for windows.
+		//
+		// Use an IANA reserved port (49151) instead of 80, because
+		// on our 386 builder, this Dial succeeds, connecting
+		// to an IIS web server somewhere.  The data center
+		// or VM or firewall must be stealing the TCP connection.
+		// 
+		// IANA Service Name and Transport Protocol Port Number Registry
+		// <http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xml>
 		go func() {
-			_, err := DialTimeout("tcp", "127.0.71.111:80", 200*time.Millisecond)
+			c, err := DialTimeout("tcp", "127.0.71.111:49151", 200*time.Millisecond)
+			if err == nil {
+				err = fmt.Errorf("unexpected: connected to %s!", c.RemoteAddr())
+				c.Close()
+			}
 			errc <- err
 		}()
 	default:

libgo/go/net/dnsclient.go

@@ -5,8 +5,6 @@
 package net
 
 import (
-	"bytes"
-	"fmt"
 	"math/rand"
 	"sort"
 )
@@ -45,20 +43,22 @@ func reverseaddr(addr string) (arpa string, err error) {
 		return "", &DNSError{Err: "unrecognized address", Name: addr}
 	}
 	if ip.To4() != nil {
-		return fmt.Sprintf("%d.%d.%d.%d.in-addr.arpa.", ip[15], ip[14], ip[13], ip[12]), nil
+		return itoa(int(ip[15])) + "." + itoa(int(ip[14])) + "." + itoa(int(ip[13])) + "." +
+			itoa(int(ip[12])) + ".in-addr.arpa.", nil
 	}
 	// Must be IPv6
-	var buf bytes.Buffer
+	buf := make([]byte, 0, len(ip)*4+len("ip6.arpa."))
 	// Add it, in reverse, to the buffer
 	for i := len(ip) - 1; i >= 0; i-- {
-		s := fmt.Sprintf("%02x", ip[i])
-		buf.WriteByte(s[1])
-		buf.WriteByte('.')
-		buf.WriteByte(s[0])
-		buf.WriteByte('.')
+		v := ip[i]
+		buf = append(buf, hexDigit[v&0xF])
+		buf = append(buf, '.')
+		buf = append(buf, hexDigit[v>>4])
+		buf = append(buf, '.')
 	}
 	// Append "ip6.arpa." and return (buf already has the final .)
-	return buf.String() + "ip6.arpa.", nil
+	buf = append(buf, "ip6.arpa."...)
+	return string(buf), nil
 }
 
 // Find answer for name in dns message.

libgo/go/net/dnsmsg_test.go

@@ -6,6 +6,7 @@ package net
 
 import (
 	"encoding/hex"
+	"reflect"
 	"testing"
 )
 
@@ -19,6 +20,7 @@ func TestDNSParseSRVReply(t *testing.T) {
 	if !ok {
 		t.Fatalf("unpacking packet failed")
 	}
+	msg.String() // exercise this code path
 	if g, e := len(msg.answer), 5; g != e {
 		t.Errorf("len(msg.answer) = %d; want %d", g, e)
 	}
@@ -38,6 +40,16 @@ func TestDNSParseSRVReply(t *testing.T) {
 		t.Errorf("len(addrs) = %d; want %d", g, e)
 		t.Logf("addrs = %#v", addrs)
 	}
+	// repack and unpack.
+	data2, ok := msg.Pack()
+	msg2 := new(dnsMsg)
+	msg2.Unpack(data2)
+	switch {
+	case !ok:
+		t.Errorf("failed to repack message")
+	case !reflect.DeepEqual(msg, msg2):
+		t.Errorf("repacked message differs from original")
+	}
 }
 
 func TestDNSParseCorruptSRVReply(t *testing.T) {
@@ -50,6 +62,7 @@ func TestDNSParseCorruptSRVReply(t *testing.T) {
 	if !ok {
 		t.Fatalf("unpacking packet failed")
 	}
+	msg.String() // exercise this code path
 	if g, e := len(msg.answer), 5; g != e {
 		t.Errorf("len(msg.answer) = %d; want %d", g, e)
 	}

libgo/go/net/fd_linux.go

@@ -84,7 +84,8 @@ func (p *pollster) StopWaiting(fd int, bits uint) {
 
 	events, already := p.events[fd]
 	if !already {
-		print("Epoll unexpected fd=", fd, "\n")
+		// The fd returned by the kernel may have been
+		// cancelled already; return silently.
 		return
 	}
 

libgo/go/net/file_test.go

@@ -27,7 +27,8 @@ type connFile interface {
 }
 
 func testFileListener(t *testing.T, net, laddr string) {
-	if net == "tcp" {
+	switch net {
+	case "tcp", "tcp4", "tcp6":
 		laddr += ":0" // any available port
 	}
 	l, err := Listen(net, laddr)
@@ -55,20 +56,52 @@ func testFileListener(t *testing.T, net, laddr string) {
 	}
 }
 
+var fileListenerTests = []struct {
+	net   string
+	laddr string
+	ipv6  bool // test with underlying AF_INET6 socket
+	linux bool // test with abstract unix domain socket, a Linux-ism
+}{
+	{net: "tcp", laddr: ""},
+	{net: "tcp", laddr: "0.0.0.0"},
+	{net: "tcp", laddr: "[::ffff:0.0.0.0]"},
+	{net: "tcp", laddr: "[::]", ipv6: true},
+
+	{net: "tcp", laddr: "127.0.0.1"},
+	{net: "tcp", laddr: "[::ffff:127.0.0.1]"},
+	{net: "tcp", laddr: "[::1]", ipv6: true},
+
+	{net: "tcp4", laddr: ""},
+	{net: "tcp4", laddr: "0.0.0.0"},
+	{net: "tcp4", laddr: "[::ffff:0.0.0.0]"},
+
+	{net: "tcp4", laddr: "127.0.0.1"},
+	{net: "tcp4", laddr: "[::ffff:127.0.0.1]"},
+
+	{net: "tcp6", laddr: "", ipv6: true},
+	{net: "tcp6", laddr: "[::]", ipv6: true},
+
+	{net: "tcp6", laddr: "[::1]", ipv6: true},
+
+	{net: "unix", laddr: "@gotest/net", linux: true},
+	{net: "unixpacket", laddr: "@gotest/net", linux: true},
+}
+
 func TestFileListener(t *testing.T) {
-	if runtime.GOOS == "windows" || runtime.GOOS == "plan9" {
+	switch runtime.GOOS {
+	case "plan9", "windows":
+		t.Logf("skipping test on %q", runtime.GOOS)
 		return
 	}
-	testFileListener(t, "tcp", "127.0.0.1")
-	testFileListener(t, "tcp", "127.0.0.1")
-	if supportsIPv6 && supportsIPv4map {
-		testFileListener(t, "tcp", "[::ffff:127.0.0.1]")
-		testFileListener(t, "tcp", "127.0.0.1")
-		testFileListener(t, "tcp", "[::ffff:127.0.0.1]")
-	}
-	if runtime.GOOS == "linux" {
-		testFileListener(t, "unix", "@gotest/net")
-		testFileListener(t, "unixpacket", "@gotest/net")
+
+	for _, tt := range fileListenerTests {
+		if skipServerTest(tt.net, "unix", tt.laddr, tt.ipv6, false, tt.linux) {
+			continue
+		}
+		if skipServerTest(tt.net, "unixpacket", tt.laddr, tt.ipv6, false, tt.linux) {
+			continue
+		}
+		testFileListener(t, tt.net, tt.laddr)
 	}
 }
 
@@ -98,9 +131,13 @@ func testFilePacketConn(t *testing.T, pcf packetConnFile, listen bool) {
 }
 
 func testFilePacketConnListen(t *testing.T, net, laddr string) {
+	switch net {
+	case "udp", "udp4", "udp6":
+		laddr += ":0" // any available port
+	}
 	l, err := ListenPacket(net, laddr)
 	if err != nil {
-		t.Fatalf("Listen failed: %v", err)
+		t.Fatalf("ListenPacket failed: %v", err)
 	}
 	testFilePacketConn(t, l.(packetConnFile), true)
 	if err := l.Close(); err != nil {
@@ -109,6 +146,10 @@ func testFilePacketConnListen(t *testing.T, net, laddr string) {
 }
 
 func testFilePacketConnDial(t *testing.T, net, raddr string) {
+	switch net {
+	case "udp", "udp4", "udp6":
+		raddr += ":12345"
+	}
 	c, err := Dial(net, raddr)
 	if err != nil {
 		t.Fatalf("Dial failed: %v", err)
@@ -119,19 +160,42 @@ func testFilePacketConnDial(t *testing.T, net, raddr string) {
 	}
 }
 
+var filePacketConnTests = []struct {
+	net   string
+	addr  string
+	ipv6  bool // test with underlying AF_INET6 socket
+	linux bool // test with abstract unix domain socket, a Linux-ism
+}{
+	{net: "udp", addr: "127.0.0.1"},
+	{net: "udp", addr: "[::ffff:127.0.0.1]"},
+	{net: "udp", addr: "[::1]", ipv6: true},
+
+	{net: "udp4", addr: "127.0.0.1"},
+	{net: "udp4", addr: "[::ffff:127.0.0.1]"},
+
+	{net: "udp6", addr: "[::1]", ipv6: true},
+
+	{net: "unixgram", addr: "@gotest3/net", linux: true},
+}
+
 func TestFilePacketConn(t *testing.T) {
-	if runtime.GOOS == "windows" || runtime.GOOS == "plan9" {
+	switch runtime.GOOS {
+	case "plan9", "windows":
+		t.Logf("skipping test on %q", runtime.GOOS)
 		return
 	}
-	testFilePacketConnListen(t, "udp", "127.0.0.1:0")
-	testFilePacketConnDial(t, "udp", "127.0.0.1:12345")
-	if supportsIPv6 {
-		testFilePacketConnListen(t, "udp", "[::1]:0")
-	}
-	if supportsIPv6 && supportsIPv4map {
-		testFilePacketConnDial(t, "udp", "[::ffff:127.0.0.1]:12345")
-	}
-	if runtime.GOOS == "linux" {
-		testFilePacketConnListen(t, "unixgram", "@gotest1/net")
+
+	for _, tt := range filePacketConnTests {
+		if skipServerTest(tt.net, "unixgram", tt.addr, tt.ipv6, false, tt.linux) {
+			continue
+		}
+		testFilePacketConnListen(t, tt.net, tt.addr)
+		switch tt.addr {
+		case "", "0.0.0.0", "[::ffff:0.0.0.0]", "[::]":
+		default:
+			if tt.net != "unixgram" {
+				testFilePacketConnDial(t, tt.net, tt.addr)
+			}
+		}
 	}
 }