diff options
Diffstat (limited to 'vendor/golang.org/x/sys/unix/mkpost.go')
-rw-r--r-- | vendor/golang.org/x/sys/unix/mkpost.go | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/vendor/golang.org/x/sys/unix/mkpost.go b/vendor/golang.org/x/sys/unix/mkpost.go new file mode 100644 index 000000000..9feddd00c --- /dev/null +++ b/vendor/golang.org/x/sys/unix/mkpost.go @@ -0,0 +1,106 @@ +// 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 Docker-based build system if we should be. + if goos == "linux" { + if os.Getenv("GOLANG_SYS_BUILD") != "docker" { + os.Stderr.WriteString("In the Docker-based 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}")) + + // Intentionally export __fds_bits field in FdSet + fdSetRegex := regexp.MustCompile(`type (FdSet) struct {(\s+)X__fds_bits(\s+\S+\s+)}`) + b = fdSetRegex.ReplaceAll(b, []byte("type $1 struct {${2}Bits$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")) + + // Convert [1024]int8 to [1024]byte in Ptmget members + convertPtmget := regexp.MustCompile(`([SC]n)(\s+)\[(\d+)\]u?int8`) + b = convertPtmget.ReplaceAll(b, []byte("$1[$3]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) +} |