syscall: add race annotations to Windows ReadFile and WriteFile

For #51618
Fixes #51673

Change-Id: Ie63408d62303293d80afed8d5cf1cb164a8abecc
Reviewed-on: https://go-review.googlesource.com/c/go/+/392774
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>

2 files changed, 34 insertions, 24 deletions

diff --git a/src/syscall/syscall_windows.go b/src/syscall/syscall_windows.go
index 78e46a656d..aba6c3f5fb 100644
--- a/src/syscall/syscall_windows.go
+++ b/src/syscall/syscall_windows.go
@@ -202,8 +202,8 @@ func NewCallbackCDecl(fn any) uintptr {
 //sys	formatMessage(flags uint32, msgsrc uintptr, msgid uint32, langid uint32, buf []uint16, args *byte) (n uint32, err error) = FormatMessageW
 //sys	ExitProcess(exitcode uint32)
 //sys	CreateFile(name *uint16, access uint32, mode uint32, sa *SecurityAttributes, createmode uint32, attrs uint32, templatefile int32) (handle Handle, err error) [failretval==InvalidHandle] = CreateFileW
-//sys	ReadFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (err error)
-//sys	WriteFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (err error)
+//sys	readFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (err error) = ReadFile
+//sys	writeFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (err error) = WriteFile
 //sys	SetFilePointer(handle Handle, lowoffset int32, highoffsetptr *int32, whence uint32) (newlowoffset uint32, err error) [failretval==0xffffffff]
 //sys	CloseHandle(handle Handle) (err error)
 //sys	GetStdHandle(stdhandle int) (handle Handle, err error) [failretval==InvalidHandle]
@@ -385,40 +385,50 @@ func Read(fd Handle, p []byte) (n int, err error) {
 		}
 		return 0, e
 	}
+	return int(done), nil
+}
+
+func Write(fd Handle, p []byte) (n int, err error) {
+	var done uint32
+	e := WriteFile(fd, p, &done, nil)
+	if e != nil {
+		return 0, e
+	}
+	return int(done), nil
+}
+
+func ReadFile(fd Handle, p []byte, done *uint32, overlapped *Overlapped) error {
+	err := readFile(fd, p, done, overlapped)
 	if race.Enabled {
-		if done > 0 {
-			race.WriteRange(unsafe.Pointer(&p[0]), int(done))
+		if *done > 0 {
+			race.WriteRange(unsafe.Pointer(&p[0]), int(*done))
 		}
 		race.Acquire(unsafe.Pointer(&ioSync))
 	}
-	if msanenabled && done > 0 {
-		msanWrite(unsafe.Pointer(&p[0]), int(done))
+	if msanenabled && *done > 0 {
+		msanWrite(unsafe.Pointer(&p[0]), int(*done))
 	}
-	if asanenabled && done > 0 {
-		asanWrite(unsafe.Pointer(&p[0]), int(done))
+	if asanenabled && *done > 0 {
+		asanWrite(unsafe.Pointer(&p[0]), int(*done))
 	}
-	return int(done), nil
+	return err
 }
 
-func Write(fd Handle, p []byte) (n int, err error) {
+func WriteFile(fd Handle, p []byte, done *uint32, overlapped *Overlapped) error {
 	if race.Enabled {
 		race.ReleaseMerge(unsafe.Pointer(&ioSync))
 	}
-	var done uint32
-	e := WriteFile(fd, p, &done, nil)
-	if e != nil {
-		return 0, e
-	}
-	if race.Enabled && done > 0 {
-		race.ReadRange(unsafe.Pointer(&p[0]), int(done))
+	err := writeFile(fd, p, done, overlapped)
+	if race.Enabled && *done > 0 {
+		race.ReadRange(unsafe.Pointer(&p[0]), int(*done))
 	}
-	if msanenabled && done > 0 {
-		msanRead(unsafe.Pointer(&p[0]), int(done))
+	if msanenabled && *done > 0 {
+		msanRead(unsafe.Pointer(&p[0]), int(*done))
 	}
-	if asanenabled && done > 0 {
-		asanRead(unsafe.Pointer(&p[0]), int(done))
+	if asanenabled && *done > 0 {
+		asanRead(unsafe.Pointer(&p[0]), int(*done))
 	}
-	return int(done), nil
+	return err
 }
 
 var ioSync int64
diff --git a/src/syscall/zsyscall_windows.go b/src/syscall/zsyscall_windows.go
index 2d6f34e059..61d89f1460 100644
--- a/src/syscall/zsyscall_windows.go
+++ b/src/syscall/zsyscall_windows.go
@@ -1016,7 +1016,7 @@ func ReadDirectoryChanges(handle Handle, buf *byte, buflen uint32, watchSubTree
 	return
 }
 
-func ReadFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (err error) {
+func readFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (err error) {
 	var _p0 *byte
 	if len(buf) > 0 {
 		_p0 = &buf[0]
@@ -1158,7 +1158,7 @@ func WriteConsole(console Handle, buf *uint16, towrite uint32, written *uint32,
 	return
 }
 
-func WriteFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (err error) {
+func writeFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (err error) {
 	var _p0 *byte
 	if len(buf) > 0 {
 		_p0 = &buf[0]