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89 lines
2.6 KiB
89 lines
2.6 KiB
8 years ago
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// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build ignore
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// mkpost processes the output of cgo -godefs to
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// modify the generated types. It is used to clean up
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// the sys API in an architecture specific manner.
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//
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// mkpost is run after cgo -godefs; see README.md.
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package main
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import (
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"bytes"
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"fmt"
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"go/format"
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"io/ioutil"
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"log"
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"os"
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"regexp"
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)
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func main() {
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// Get the OS and architecture (using GOARCH_TARGET if it exists)
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goos := os.Getenv("GOOS")
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goarch := os.Getenv("GOARCH_TARGET")
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if goarch == "" {
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goarch = os.Getenv("GOARCH")
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}
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// Check that we are using the new build system if we should be.
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if goos == "linux" && goarch != "sparc64" {
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if os.Getenv("GOLANG_SYS_BUILD") != "docker" {
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os.Stderr.WriteString("In the new build system, mkpost should not be called directly.\n")
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os.Stderr.WriteString("See README.md\n")
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os.Exit(1)
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}
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}
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b, err := ioutil.ReadAll(os.Stdin)
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if err != nil {
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log.Fatal(err)
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}
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// If we have empty Ptrace structs, we should delete them. Only s390x emits
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// nonempty Ptrace structs.
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ptraceRexexp := regexp.MustCompile(`type Ptrace((Psw|Fpregs|Per) struct {\s*})`)
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b = ptraceRexexp.ReplaceAll(b, nil)
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// Replace the control_regs union with a blank identifier for now.
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controlRegsRegex := regexp.MustCompile(`(Control_regs)\s+\[0\]uint64`)
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b = controlRegsRegex.ReplaceAll(b, []byte("_ [0]uint64"))
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// Remove fields that are added by glibc
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// Note that this is unstable as the identifers are private.
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removeFieldsRegex := regexp.MustCompile(`X__glibc\S*`)
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b = removeFieldsRegex.ReplaceAll(b, []byte("_"))
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// We refuse to export private fields on s390x
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if goarch == "s390x" && goos == "linux" {
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// Remove cgo padding fields
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removeFieldsRegex := regexp.MustCompile(`Pad_cgo_\d+`)
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b = removeFieldsRegex.ReplaceAll(b, []byte("_"))
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// Remove padding, hidden, or unused fields
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removeFieldsRegex = regexp.MustCompile(`X_\S+`)
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b = removeFieldsRegex.ReplaceAll(b, []byte("_"))
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}
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// Remove the first line of warning from cgo
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b = b[bytes.IndexByte(b, '\n')+1:]
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// Modify the command in the header to include:
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// mkpost, our own warning, and a build tag.
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replacement := fmt.Sprintf(`$1 | go run mkpost.go
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// Code generated by the command above; see README.md. DO NOT EDIT.
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// +build %s,%s`, goarch, goos)
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cgoCommandRegex := regexp.MustCompile(`(cgo -godefs .*)`)
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b = cgoCommandRegex.ReplaceAll(b, []byte(replacement))
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// gofmt
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b, err = format.Source(b)
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if err != nil {
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log.Fatal(err)
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}
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os.Stdout.Write(b)
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}
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