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starlog/vendor/golang.org/x/sys/unix/mkasm_darwin.go

79 lines
2.2 KiB
Go

// Copyright 2018 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
// mkasm_darwin.go generates assembly trampolines to call libSystem routines from Go.
//This program must be run after mksyscall.go.
package main
import (
"bytes"
"fmt"
"io/ioutil"
"log"
"os"
"strings"
)
func writeASMFile(in string, fileName string, buildTags string) {
trampolines := map[string]bool{}
var out bytes.Buffer
fmt.Fprintf(&out, "// go run mkasm_darwin.go %s\n", strings.Join(os.Args[1:], " "))
fmt.Fprintf(&out, "// Code generated by the command above; DO NOT EDIT.\n")
fmt.Fprintf(&out, "\n")
fmt.Fprintf(&out, "// +build %s\n", buildTags)
fmt.Fprintf(&out, "\n")
fmt.Fprintf(&out, "#include \"textflag.h\"\n")
for _, line := range strings.Split(in, "\n") {
if !strings.HasPrefix(line, "func ") || !strings.HasSuffix(line, "_trampoline()") {
continue
}
fn := line[5 : len(line)-13]
if !trampolines[fn] {
trampolines[fn] = true
fmt.Fprintf(&out, "TEXT ·%s_trampoline(SB),NOSPLIT,$0-0\n", fn)
fmt.Fprintf(&out, "\tJMP\t%s(SB)\n", fn)
}
}
err := ioutil.WriteFile(fileName, out.Bytes(), 0644)
if err != nil {
log.Fatalf("can't write %s: %s", fileName, err)
}
}
func main() {
in1, err := ioutil.ReadFile("syscall_darwin.go")
if err != nil {
log.Fatalf("can't open syscall_darwin.go: %s", err)
}
arch := os.Args[1]
in2, err := ioutil.ReadFile(fmt.Sprintf("syscall_darwin_%s.go", arch))
if err != nil {
log.Fatalf("can't open syscall_darwin_%s.go: %s", arch, err)
}
in3, err := ioutil.ReadFile(fmt.Sprintf("zsyscall_darwin_%s.go", arch))
if err != nil {
log.Fatalf("can't open zsyscall_darwin_%s.go: %s", arch, err)
}
in := string(in1) + string(in2) + string(in3)
writeASMFile(in, fmt.Sprintf("zsyscall_darwin_%s.s", arch), "go1.12")
in1, err = ioutil.ReadFile("syscall_darwin.1_13.go")
if err != nil {
log.Fatalf("can't open syscall_darwin.1_13.go: %s", err)
}
in2, err = ioutil.ReadFile(fmt.Sprintf("zsyscall_darwin_%s.1_13.go", arch))
if err != nil {
log.Fatalf("can't open zsyscall_darwin_%s.1_13.go: %s", arch, err)
}
in = string(in1) + string(in2)
writeASMFile(in, fmt.Sprintf("zsyscall_darwin_%s.1_13.s", arch), "go1.13")
}