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Source file src/runtime/wincallback.go

Documentation: runtime

  // 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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