| // 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) |
| } |
| |
| // 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("_")) |
| |
| // We refuse to export private fields on s390x |
| if goarch == "s390x" && goos == "linux" { |
| // Remove cgo padding fields |
| removeFieldsRegex := regexp.MustCompile(`Pad_cgo_\d+`) |
| b = removeFieldsRegex.ReplaceAll(b, []byte("_")) |
| |
| // Remove padding, hidden, or unused fields |
| removeFieldsRegex = regexp.MustCompile(`X_\S+`) |
| 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) |
| } |