// Copyright 2016 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 // mkpost processes the output of cgo -godefs to // modify the generated types. It is used to clean up // the sys API in an architecture specific manner. // // mkpost is run after cgo -godefs; see README.md. package main import ( "bytes" "fmt" "go/format" "io/ioutil" "log" "os" "regexp" ) func main() { // Get the OS and architecture (using GOARCH_TARGET if it exists) goos := os.Getenv("GOOS") goarch := os.Getenv("GOARCH_TARGET") if goarch == "" { goarch = os.Getenv("GOARCH") } // Check that we are using the new build system if we should be. if goos == "linux" && goarch != "sparc64" { if os.Getenv("GOLANG_SYS_BUILD") != "docker" { os.Stderr.WriteString("In the new build system, mkpost should not be called directly.\n") os.Stderr.WriteString("See README.md\n") os.Exit(1) } } b, err := ioutil.ReadAll(os.Stdin) if err != nil { log.Fatal(err) } // Intentionally export __val fields in Fsid and Sigset_t valRegex := regexp.MustCompile(`type (Fsid|Sigset_t) struct {(\s+)X__val(\s+\S+\s+)}`) b = valRegex.ReplaceAll(b, []byte("type $1 struct {${2}Val$3}")) // If we have empty Ptrace structs, we should delete them. Only s390x emits // nonempty Ptrace structs. ptraceRexexp := regexp.MustCompile(`type Ptrace((Psw|Fpregs|Per) struct {\s*})`) b = ptraceRexexp.ReplaceAll(b, nil) // Replace the control_regs union with a blank identifier for now. controlRegsRegex := regexp.MustCompile(`(Control_regs)\s+\[0\]uint64`) b = controlRegsRegex.ReplaceAll(b, []byte("_ [0]uint64")) // Remove fields that are added by glibc // Note that this is unstable as the identifers are private. removeFieldsRegex := regexp.MustCompile(`X__glibc\S*`) b = removeFieldsRegex.ReplaceAll(b, []byte("_")) // Convert [65]int8 to [65]byte in Utsname members to simplify // conversion to string; see golang.org/issue/20753 convertUtsnameRegex := regexp.MustCompile(`((Sys|Node|Domain)name|Release|Version|Machine)(\s+)\[(\d+)\]u?int8`) b = convertUtsnameRegex.ReplaceAll(b, []byte("$1$3[$4]byte")) // Remove spare fields (e.g. in Statx_t) spareFieldsRegex := regexp.MustCompile(`X__spare\S*`) b = spareFieldsRegex.ReplaceAll(b, []byte("_")) // Remove cgo padding fields removePaddingFieldsRegex := regexp.MustCompile(`Pad_cgo_\d+`) b = removePaddingFieldsRegex.ReplaceAll(b, []byte("_")) // Remove padding, hidden, or unused fields removeFieldsRegex = regexp.MustCompile(`\b(X_\S+|Padding)`) b = removeFieldsRegex.ReplaceAll(b, []byte("_")) // Remove the first line of warning from cgo b = b[bytes.IndexByte(b, '\n')+1:] // Modify the command in the header to include: // mkpost, our own warning, and a build tag. replacement := fmt.Sprintf(`$1 | go run mkpost.go // Code generated by the command above; see README.md. DO NOT EDIT. // +build %s,%s`, goarch, goos) cgoCommandRegex := regexp.MustCompile(`(cgo -godefs .*)`) b = cgoCommandRegex.ReplaceAll(b, []byte(replacement)) // gofmt b, err = format.Source(b) if err != nil { log.Fatal(err) } os.Stdout.Write(b) }