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path: root/vendor/golang.org/x/sys/unix/mkpost.go
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Diffstat (limited to 'vendor/golang.org/x/sys/unix/mkpost.go')
-rw-r--r--vendor/golang.org/x/sys/unix/mkpost.go98
1 files changed, 98 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 0000000..7e5c22c
--- /dev/null
+++ b/vendor/golang.org/x/sys/unix/mkpost.go
@@ -0,0 +1,98 @@
+// 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)
+}