github.com/xingly-cn/shorturl-go@v0.0.0-20220110130535-e21de4659f74/pkg/mod/golang.org/x/sys@v0.0.0-20200323222414-85ca7c5b95cd/unix/mkasm_darwin.go (about) 1 // Copyright 2018 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 // +build ignore 6 7 // mkasm_darwin.go generates assembly trampolines to call libSystem routines from Go. 8 //This program must be run after mksyscall.go. 9 package main 10 11 import ( 12 "bytes" 13 "fmt" 14 "io/ioutil" 15 "log" 16 "os" 17 "strings" 18 ) 19 20 func writeASMFile(in string, fileName string, buildTags string) { 21 trampolines := map[string]bool{} 22 23 var out bytes.Buffer 24 25 fmt.Fprintf(&out, "// go run mkasm_darwin.go %s\n", strings.Join(os.Args[1:], " ")) 26 fmt.Fprintf(&out, "// Code generated by the command above; DO NOT EDIT.\n") 27 fmt.Fprintf(&out, "\n") 28 fmt.Fprintf(&out, "// +build %s\n", buildTags) 29 fmt.Fprintf(&out, "\n") 30 fmt.Fprintf(&out, "#include \"textflag.h\"\n") 31 for _, line := range strings.Split(in, "\n") { 32 if !strings.HasPrefix(line, "func ") || !strings.HasSuffix(line, "_trampoline()") { 33 continue 34 } 35 fn := line[5 : len(line)-13] 36 if !trampolines[fn] { 37 trampolines[fn] = true 38 fmt.Fprintf(&out, "TEXT ยท%s_trampoline(SB),NOSPLIT,$0-0\n", fn) 39 fmt.Fprintf(&out, "\tJMP\t%s(SB)\n", fn) 40 } 41 } 42 err := ioutil.WriteFile(fileName, out.Bytes(), 0644) 43 if err != nil { 44 log.Fatalf("can't write %s: %s", fileName, err) 45 } 46 } 47 48 func main() { 49 in1, err := ioutil.ReadFile("syscall_darwin.go") 50 if err != nil { 51 log.Fatalf("can't open syscall_darwin.go: %s", err) 52 } 53 arch := os.Args[1] 54 in2, err := ioutil.ReadFile(fmt.Sprintf("syscall_darwin_%s.go", arch)) 55 if err != nil { 56 log.Fatalf("can't open syscall_darwin_%s.go: %s", arch, err) 57 } 58 in3, err := ioutil.ReadFile(fmt.Sprintf("zsyscall_darwin_%s.go", arch)) 59 if err != nil { 60 log.Fatalf("can't open zsyscall_darwin_%s.go: %s", arch, err) 61 } 62 in := string(in1) + string(in2) + string(in3) 63 64 writeASMFile(in, fmt.Sprintf("zsyscall_darwin_%s.s", arch), "go1.12") 65 66 in1, err = ioutil.ReadFile("syscall_darwin.1_13.go") 67 if err != nil { 68 log.Fatalf("can't open syscall_darwin.1_13.go: %s", err) 69 } 70 in2, err = ioutil.ReadFile(fmt.Sprintf("zsyscall_darwin_%s.1_13.go", arch)) 71 if err != nil { 72 log.Fatalf("can't open zsyscall_darwin_%s.1_13.go: %s", arch, err) 73 } 74 75 in = string(in1) + string(in2) 76 77 writeASMFile(in, fmt.Sprintf("zsyscall_darwin_%s.1_13.s", arch), "go1.13") 78 }