syscall: mksyscall_mingw.sh emitting shorter calls (to Syscall or Syscall6) when there are fewer arguments

R=rsc
CC=golang-dev
http://codereview.appspot.com/622041

Committer: Russ Cox <rsc@golang.org>

2 files changed, 18 insertions, 8 deletions

diff --git a/src/pkg/syscall/mksyscall_mingw.sh b/src/pkg/syscall/mksyscall_mingw.sh
index 4913b3655..52fb1c3bb 100755
--- a/src/pkg/syscall/mksyscall_mingw.sh
+++ b/src/pkg/syscall/mksyscall_mingw.sh
@@ -109,7 +109,7 @@ while(<>) {
 	# Go function header.
 	$text .= sprintf "func %s(%s) (%s) {\n", $func, join(', ', @in), join(', ', @out);
 
-	# Prepare arguments to Syscall9.
+	# Prepare arguments to Syscall.
 	my @args = ();
 	my $n = 0;
 	foreach my $p (@in) {
@@ -138,8 +138,18 @@ while(<>) {
 	}
 
 	# Determine which form to use; pad args with zeros.
-	my $asm = "Syscall9";
-	if(@args <= 9) {
+	my $asm = "Syscall";
+	if(@args <= 3) {
+		while(@args < 3) {
+			push @args, "0";
+		}
+	} elsif(@args <= 6) {
+		$asm = "Syscall6";
+		while(@args < 6) {
+			push @args, "0";
+		}
+	} elsif(@args <= 9) {
+		$asm = "Syscall9";
 		while(@args < 9) {
 			push @args, "0";
 		}
diff --git a/src/pkg/syscall/zsyscall_mingw_386.go b/src/pkg/syscall/zsyscall_mingw_386.go
index c2bc912ac..4c16ac5d6 100644
--- a/src/pkg/syscall/zsyscall_mingw_386.go
+++ b/src/pkg/syscall/zsyscall_mingw_386.go
@@ -16,13 +16,13 @@ var (
 )
 
 func GetLastError() (lasterrno int) {
-	r0, _, _ := Syscall9(procGetLastError, 0, 0, 0, 0, 0, 0, 0, 0, 0)
+	r0, _, _ := Syscall(procGetLastError, 0, 0, 0)
 	lasterrno = int(r0)
 	return
 }
 
 func LoadLibrary(libname string) (handle uint32, errno int) {
-	r0, _, e1 := Syscall9(procLoadLibraryW, uintptr(unsafe.Pointer(StringToUTF16Ptr(libname))), 0, 0, 0, 0, 0, 0, 0, 0)
+	r0, _, e1 := Syscall(procLoadLibraryW, uintptr(unsafe.Pointer(StringToUTF16Ptr(libname))), 0, 0)
 	handle = uint32(r0)
 	if uint32(r0) == 0 {
 		errno = int(e1)
@@ -33,7 +33,7 @@ func LoadLibrary(libname string) (handle uint32, errno int) {
 }
 
 func FreeLibrary(handle uint32) (ok bool, errno int) {
-	r0, _, e1 := Syscall9(procFreeLibrary, uintptr(handle), 0, 0, 0, 0, 0, 0, 0, 0)
+	r0, _, e1 := Syscall(procFreeLibrary, uintptr(handle), 0, 0)
 	ok = bool(r0 != 0)
 	if uint32(r0) == 0 {
 		errno = int(e1)
@@ -44,7 +44,7 @@ func FreeLibrary(handle uint32) (ok bool, errno int) {
 }
 
 func GetProcAddress(module uint32, procname string) (proc uint32, errno int) {
-	r0, _, e1 := Syscall9(procGetProcAddress, uintptr(module), uintptr(unsafe.Pointer(StringBytePtr(procname))), 0, 0, 0, 0, 0, 0, 0)
+	r0, _, e1 := Syscall(procGetProcAddress, uintptr(module), uintptr(unsafe.Pointer(StringBytePtr(procname))), 0)
 	proc = uint32(r0)
 	if uint32(r0) == 0 {
 		errno = int(e1)
@@ -55,7 +55,7 @@ func GetProcAddress(module uint32, procname string) (proc uint32, errno int) {
 }
 
 func GetVersion() (ver uint32, errno int) {
-	r0, _, e1 := Syscall9(procGetVersion, 0, 0, 0, 0, 0, 0, 0, 0, 0)
+	r0, _, e1 := Syscall(procGetVersion, 0, 0, 0)
 	ver = uint32(r0)
 	if uint32(r0) == 0 {
 		errno = int(e1)