libgo: update to Go 1.8 release candidate 1

    
    Compiler changes:
      * Change map assignment to use mapassign and assign value directly.
      * Change string iteration to use decoderune, faster for ASCII strings.
      * Change makeslice to take int, and use makeslice64 for larger values.
      * Add new noverflow field to hmap struct used for maps.
    
    Unresolved problems, to be fixed later:
      * Commented out test in go/types/sizes_test.go that doesn't compile.
      * Commented out reflect.TestStructOf test for padding after zero-sized field.
    
    Reviewed-on: https://go-review.googlesource.com/35231

gotools/:
	Updates for Go 1.8rc1.
	* Makefile.am (go_cmd_go_files): Add bug.go.
	(s-zdefaultcc): Write defaultPkgConfig.
	* Makefile.in: Rebuild.

From-SVN: r244456

1 files changed, 13 insertions, 2 deletions

diff --git a/libgo/go/net/fd_unix.go b/libgo/go/net/fd_unix.go
index 0309db08ebc..9bc5ebc7a0d 100644
--- a/libgo/go/net/fd_unix.go
+++ b/libgo/go/net/fd_unix.go
@@ -24,11 +24,15 @@ type netFD struct {
 	sysfd       int
 	family      int
 	sotype      int
+	isStream    bool
 	isConnected bool
 	net         string
 	laddr       Addr
 	raddr       Addr
 
+	// writev cache.
+	iovecs *[]syscall.Iovec
+
 	// wait server
 	pd pollDesc
 }
@@ -37,7 +41,7 @@ func sysInit() {
 }
 
 func newFD(sysfd, family, sotype int, net string) (*netFD, error) {
-	return &netFD{sysfd: sysfd, family: family, sotype: sotype, net: net}, nil
+	return &netFD{sysfd: sysfd, family: family, sotype: sotype, net: net, isStream: sotype == syscall.SOCK_STREAM}, nil
 }
 
 func (fd *netFD) init() error {
@@ -235,6 +239,9 @@ func (fd *netFD) Read(p []byte) (n int, err error) {
 	if err := fd.pd.prepareRead(); err != nil {
 		return 0, err
 	}
+	if fd.isStream && len(p) > 1<<30 {
+		p = p[:1<<30]
+	}
 	for {
 		n, err = syscall.Read(fd.sysfd, p)
 		if err != nil {
@@ -318,7 +325,11 @@ func (fd *netFD) Write(p []byte) (nn int, err error) {
 	}
 	for {
 		var n int
-		n, err = syscall.Write(fd.sysfd, p[nn:])
+		max := len(p)
+		if fd.isStream && max-nn > 1<<30 {
+			max = nn + 1<<30
+		}
+		n, err = syscall.Write(fd.sysfd, p[nn:max])
 		if n > 0 {
 			nn += n
 		}