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// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build ignore
// Generate Windows callback assembly file.
package main
import (
"bytes"
"fmt"
"io/ioutil"
"os"
)
const maxCallback = 2000
func genasm() {
var buf bytes.Buffer
buf.WriteString(`// generated by wincallback.go; run go generate
// runtime·callbackasm is called by external code to
// execute Go implemented callback function. It is not
// called from the start, instead runtime·compilecallback
// always returns address into runtime·callbackasm offset
// appropriately so different callbacks start with different
// CALL instruction in runtime·callbackasm. This determines
// which Go callback function is executed later on.
TEXT runtime·callbackasm(SB),7,$0
`)
for i := 0; i < maxCallback; i++ {
buf.WriteString("\tCALL\truntime·callbackasm1(SB)\n")
}
err := ioutil.WriteFile("zcallback_windows.s", buf.Bytes(), 0666)
if err != nil {
fmt.Fprintf(os.Stderr, "wincallback: %s\n", err)
os.Exit(2)
}
}
func gengo() {
var buf bytes.Buffer
buf.WriteString(fmt.Sprintf(`// generated by wincallback.go; run go generate
package runtime
const cb_max = %d // maximum number of windows callbacks allowed
`, maxCallback))
err := ioutil.WriteFile("zcallback_windows.go", buf.Bytes(), 0666)
if err != nil {
fmt.Fprintf(os.Stderr, "wincallback: %s\n", err)
os.Exit(2)
}
}
func main() {
genasm()
gengo()
}
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