[llgo] Roll gofrontend forward

Switch gofrontend to using go.googlesource.com, and
update to 81eb6a3f425b2158c67ee32c0cc973a72ce9d6be.

There are various changes required to update to the
go 1.5 runtime:

typemap.go is changed to accommodate the change in representation for equal/hash algorithms, and the removal of the zero value/type.
CMakeLists.txt is updated to add the build tree to the package search path, so internal packages, which are not installed, are found.
various files changes due to removal of __go_new_nopointers; the same change as in D11863, but with NoUnwindAttribute added to the added runtime functions which are called with "callOnly".
minor cleanups in ssa.go while investigating issues with unwinding/panic handling.

Differential Revisision: http://reviews.llvm.org/D15188

llvm-svn: 263536

1 files changed, 27 insertions, 7 deletions

diff --git a/llgo/third_party/gofrontend/libgo/go/os/file_unix.go b/llgo/third_party/gofrontend/libgo/go/os/file_unix.go
index b25e62ff003..7a18987d283 100644
--- a/llgo/third_party/gofrontend/libgo/go/os/file_unix.go
+++ b/llgo/third_party/gofrontend/libgo/go/os/file_unix.go
@@ -12,6 +12,14 @@ import (
 	"syscall"
 )
 
+func rename(oldname, newname string) error {
+	e := syscall.Rename(oldname, newname)
+	if e != nil {
+		return &LinkError{"rename", oldname, newname, e}
+	}
+	return nil
+}
+
 // File represents an open file descriptor.
 type File struct {
 	*file
@@ -73,12 +81,24 @@ const DevNull = "/dev/null"
 // (O_RDONLY etc.) and perm, (0666 etc.) if applicable.  If successful,
 // methods on the returned File can be used for I/O.
 // If there is an error, it will be of type *PathError.
-func OpenFile(name string, flag int, perm FileMode) (file *File, err error) {
+func OpenFile(name string, flag int, perm FileMode) (*File, error) {
+	chmod := false
+	if !supportsCreateWithStickyBit && flag&O_CREATE != 0 && perm&ModeSticky != 0 {
+		if _, err := Stat(name); IsNotExist(err) {
+			chmod = true
+		}
+	}
+
 	r, e := syscall.Open(name, flag|syscall.O_CLOEXEC, syscallMode(perm))
 	if e != nil {
 		return nil, &PathError{"open", name, e}
 	}
 
+	// open(2) itself won't handle the sticky bit on *BSD and Solaris
+	if chmod {
+		Chmod(name, perm)
+	}
+
 	// There's a race here with fork/exec, which we are
 	// content to live with.  See ../syscall/exec_unix.go.
 	if !supportsCloseOnExec {
@@ -126,12 +146,12 @@ func (file *file) close() error {
 
 // Stat returns the FileInfo structure describing file.
 // If there is an error, it will be of type *PathError.
-func (f *File) Stat() (fi FileInfo, err error) {
+func (f *File) Stat() (FileInfo, error) {
 	if f == nil {
 		return nil, ErrInvalid
 	}
 	var stat syscall.Stat_t
-	err = syscall.Fstat(f.fd, &stat)
+	err := syscall.Fstat(f.fd, &stat)
 	if err != nil {
 		return nil, &PathError{"stat", f.name, err}
 	}
@@ -140,9 +160,9 @@ func (f *File) Stat() (fi FileInfo, err error) {
 
 // Stat returns a FileInfo describing the named file.
 // If there is an error, it will be of type *PathError.
-func Stat(name string) (fi FileInfo, err error) {
+func Stat(name string) (FileInfo, error) {
 	var stat syscall.Stat_t
-	err = syscall.Stat(name, &stat)
+	err := syscall.Stat(name, &stat)
 	if err != nil {
 		return nil, &PathError{"stat", name, err}
 	}
@@ -153,9 +173,9 @@ func Stat(name string) (fi FileInfo, err error) {
 // If the file is a symbolic link, the returned FileInfo
 // describes the symbolic link.  Lstat makes no attempt to follow the link.
 // If there is an error, it will be of type *PathError.
-func Lstat(name string) (fi FileInfo, err error) {
+func Lstat(name string) (FileInfo, error) {
 	var stat syscall.Stat_t
-	err = syscall.Lstat(name, &stat)
+	err := syscall.Lstat(name, &stat)
 	if err != nil {
 		return nil, &PathError{"lstat", name, err}
 	}