[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, 45 insertions, 53 deletions

diff --git a/llgo/third_party/gofrontend/libgo/go/syscall/security_windows.go b/llgo/third_party/gofrontend/libgo/go/syscall/security_windows.go
index b22ecf578e0..1625b07ae4b 100644
--- a/llgo/third_party/gofrontend/libgo/go/syscall/security_windows.go
+++ b/llgo/third_party/gofrontend/libgo/go/syscall/security_windows.go
@@ -41,21 +41,20 @@ func TranslateAccountName(username string, from, to uint32, initSize int) (strin
 	if e != nil {
 		return "", e
 	}
-	b := make([]uint16, 50)
-	n := uint32(len(b))
-	e = TranslateName(u, from, to, &b[0], &n)
-	if e != nil {
+	n := uint32(50)
+	for {
+		b := make([]uint16, n)
+		e = TranslateName(u, from, to, &b[0], &n)
+		if e == nil {
+			return UTF16ToString(b[:n]), nil
+		}
 		if e != ERROR_INSUFFICIENT_BUFFER {
 			return "", e
 		}
-		// make receive buffers of requested size and try again
-		b = make([]uint16, n)
-		e = TranslateName(u, from, to, &b[0], &n)
-		if e != nil {
+		if n <= uint32(len(b)) {
 			return "", e
 		}
 	}
-	return UTF16ToString(b), nil
 }
 
 const (
@@ -136,26 +135,23 @@ func LookupSID(system, account string) (sid *SID, domain string, accType uint32,
 			return nil, "", 0, e
 		}
 	}
-	db := make([]uint16, 50)
-	dn := uint32(len(db))
-	b := make([]byte, 50)
-	n := uint32(len(b))
-	sid = (*SID)(unsafe.Pointer(&b[0]))
-	e = LookupAccountName(sys, acc, sid, &n, &db[0], &dn, &accType)
-	if e != nil {
+	n := uint32(50)
+	dn := uint32(50)
+	for {
+		b := make([]byte, n)
+		db := make([]uint16, dn)
+		sid = (*SID)(unsafe.Pointer(&b[0]))
+		e = LookupAccountName(sys, acc, sid, &n, &db[0], &dn, &accType)
+		if e == nil {
+			return sid, UTF16ToString(db), accType, nil
+		}
 		if e != ERROR_INSUFFICIENT_BUFFER {
 			return nil, "", 0, e
 		}
-		// make receive buffers of requested size and try again
-		b = make([]byte, n)
-		sid = (*SID)(unsafe.Pointer(&b[0]))
-		db = make([]uint16, dn)
-		e = LookupAccountName(sys, acc, sid, &n, &db[0], &dn, &accType)
-		if e != nil {
+		if n <= uint32(len(b)) {
 			return nil, "", 0, e
 		}
 	}
-	return sid, UTF16ToString(db), accType, nil
 }
 
 // String converts sid to a string format
@@ -197,24 +193,22 @@ func (sid *SID) LookupAccount(system string) (account, domain string, accType ui
 			return "", "", 0, err
 		}
 	}
-	b := make([]uint16, 50)
-	n := uint32(len(b))
-	db := make([]uint16, 50)
-	dn := uint32(len(db))
-	e := LookupAccountSid(sys, sid, &b[0], &n, &db[0], &dn, &accType)
-	if e != nil {
+	n := uint32(50)
+	dn := uint32(50)
+	for {
+		b := make([]uint16, n)
+		db := make([]uint16, dn)
+		e := LookupAccountSid(sys, sid, &b[0], &n, &db[0], &dn, &accType)
+		if e == nil {
+			return UTF16ToString(b), UTF16ToString(db), accType, nil
+		}
 		if e != ERROR_INSUFFICIENT_BUFFER {
 			return "", "", 0, e
 		}
-		// make receive buffers of requested size and try again
-		b = make([]uint16, n)
-		db = make([]uint16, dn)
-		e = LookupAccountSid(nil, sid, &b[0], &n, &db[0], &dn, &accType)
-		if e != nil {
+		if n <= uint32(len(b)) {
 			return "", "", 0, e
 		}
 	}
-	return UTF16ToString(b), UTF16ToString(db), accType, nil
 }
 
 const (
@@ -326,21 +320,20 @@ func (t Token) Close() error {
 
 // getInfo retrieves a specified type of information about an access token.
 func (t Token) getInfo(class uint32, initSize int) (unsafe.Pointer, error) {
-	b := make([]byte, initSize)
-	var n uint32
-	e := GetTokenInformation(t, class, &b[0], uint32(len(b)), &n)
-	if e != nil {
+	n := uint32(initSize)
+	for {
+		b := make([]byte, n)
+		e := GetTokenInformation(t, class, &b[0], uint32(len(b)), &n)
+		if e == nil {
+			return unsafe.Pointer(&b[0]), nil
+		}
 		if e != ERROR_INSUFFICIENT_BUFFER {
 			return nil, e
 		}
-		// make receive buffers of requested size and try again
-		b = make([]byte, n)
-		e = GetTokenInformation(t, class, &b[0], uint32(len(b)), &n)
-		if e != nil {
+		if n <= uint32(len(b)) {
 			return nil, e
 		}
 	}
-	return unsafe.Pointer(&b[0]), nil
 }
 
 // GetTokenUser retrieves access token t user account information.
@@ -366,19 +359,18 @@ func (t Token) GetTokenPrimaryGroup() (*Tokenprimarygroup, error) {
 // GetUserProfileDirectory retrieves path to the
 // root directory of the access token t user's profile.
 func (t Token) GetUserProfileDirectory() (string, error) {
-	b := make([]uint16, 100)
-	n := uint32(len(b))
-	e := GetUserProfileDirectory(t, &b[0], &n)
-	if e != nil {
+	n := uint32(100)
+	for {
+		b := make([]uint16, n)
+		e := GetUserProfileDirectory(t, &b[0], &n)
+		if e == nil {
+			return UTF16ToString(b), nil
+		}
 		if e != ERROR_INSUFFICIENT_BUFFER {
 			return "", e
 		}
-		// make receive buffers of requested size and try again
-		b = make([]uint16, n)
-		e = GetUserProfileDirectory(t, &b[0], &n)
-		if e != nil {
+		if n <= uint32(len(b)) {
 			return "", e
 		}
 	}
-	return UTF16ToString(b), nil
 }