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// 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.
//go: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"
"log"
"os"
"regexp"
)
func main() {
// Get the OS and architecture (using GOARCH_TARGET if it exists)
goos := os.Getenv("GOOS_TARGET")
if goos == "" {
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 := io.ReadAll(os.Stdin)
if err != nil {
log.Fatal(err)
}
if goos == "aix" {
// Replace type of Atim, Mtim and Ctim by Timespec in Stat_t
// to avoid having both StTimespec and Timespec.
sttimespec := regexp.MustCompile(`_Ctype_struct_st_timespec`)
b = sttimespec.ReplaceAll(b, []byte("Timespec"))
}
if goos == "darwin" {
// KinfoProc contains various pointers to objects stored
// in kernel space. Replace these by uintptr to prevent
// accidental dereferencing.
kinfoProcPointerRegex := regexp.MustCompile(`\*_Ctype_struct_(pgrp|proc|session|sigacts|ucred|user|vnode)`)
b = kinfoProcPointerRegex.ReplaceAll(b, []byte("uintptr"))
// ExternProc contains a p_un member that in kernel
// space stores a pair of pointers and in user space
// stores the process creation time. We only care about
// the process creation time.
externProcStarttimeRegex := regexp.MustCompile(`P_un\s*\[\d+\]byte`)
b = externProcStarttimeRegex.ReplaceAll(b, []byte("P_starttime Timeval"))
// Convert [n]int8 to [n]byte in Eproc and ExternProc members to
// simplify conversion to string.
convertEprocRegex := regexp.MustCompile(`(P_comm|Wmesg|Login)(\s+)\[(\d+)\]int8`)
b = convertEprocRegex.ReplaceAll(b, []byte("$1$2[$3]byte"))
}
if goos == "freebsd" {
// Inside PtraceLwpInfoStruct replace __Siginfo with __PtraceSiginfo,
// Create __PtraceSiginfo as a copy of __Siginfo where every *byte instance is replaced by uintptr
ptraceLwpInfoStruct := regexp.MustCompile(`(?s:type PtraceLwpInfoStruct struct \{.*?\})`)
b = ptraceLwpInfoStruct.ReplaceAllFunc(b, func(in []byte) []byte {
return bytes.ReplaceAll(in, []byte("__Siginfo"), []byte("__PtraceSiginfo"))
})
siginfoStruct := regexp.MustCompile(`(?s:type __Siginfo struct \{.*?\})`)
b = siginfoStruct.ReplaceAllFunc(b, func(in []byte) []byte {
out := append([]byte{}, in...)
out = append(out, '\n', '\n')
out = append(out,
bytes.ReplaceAll(
bytes.ReplaceAll(in, []byte("__Siginfo"), []byte("__PtraceSiginfo")),
[]byte("*byte"), []byte("uintptr"))...)
return out
})
// Inside PtraceIoDesc replace the Offs field, which refers to an address
// in the child process (not the Go parent), with a uintptr.
ptraceIoDescStruct := regexp.MustCompile(`(?s:type PtraceIoDesc struct \{.*?\})`)
addrField := regexp.MustCompile(`(\bOffs\s+)\*byte`)
b = ptraceIoDescStruct.ReplaceAllFunc(b, func(in []byte) []byte {
return addrField.ReplaceAll(in, []byte(`${1}uintptr`))
})
}
if goos == "solaris" {
// Convert *int8 to *byte in Iovec.Base like on every other platform.
convertIovecBase := regexp.MustCompile(`Base\s+\*int8`)
iovecType := regexp.MustCompile(`type Iovec struct {[^}]*}`)
iovecStructs := iovecType.FindAll(b, -1)
for _, s := range iovecStructs {
newNames := convertIovecBase.ReplaceAll(s, []byte("Base *byte"))
b = bytes.Replace(b, s, newNames, 1)
}
}
if goos == "linux" && goarch != "riscv64" {
// The RISCV_HWPROBE_ constants are only defined on Linux for riscv64
hwprobeConstRexexp := regexp.MustCompile(`const\s+\(\s+RISCV_HWPROBE_[^\)]+\)`)
b = hwprobeConstRexexp.ReplaceAll(b, nil)
}
// Intentionally export __val fields in Fsid and Sigset_t
valRegex := regexp.MustCompile(`type (Fsid|Sigset_t) struct {(\s+)X__(bits|val)(\s+\S+\s+)}`)
b = valRegex.ReplaceAll(b, []byte("type $1 struct {${2}Val$4}"))
// 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}"))
// Intentionally export __icmp6_filt field in icmpv6_filter
icmpV6Regex := regexp.MustCompile(`type (ICMPv6Filter) struct {(\s+)X__icmp6_filt(\s+\S+\s+)}`)
b = icmpV6Regex.ReplaceAll(b, []byte("type $1 struct {${2}Filt$3}"))
// Intentionally export address storage field in SockaddrStorage convert it to [N]byte.
convertSockaddrStorageData := regexp.MustCompile(`(X__ss_padding)\s+\[(\d+)\]u?int8`)
sockaddrStorageType := regexp.MustCompile(`type SockaddrStorage struct {[^}]*}`)
sockaddrStorageStructs := sockaddrStorageType.FindAll(b, -1)
for _, s := range sockaddrStorageStructs {
newNames := convertSockaddrStorageData.ReplaceAll(s, []byte("Data [$2]byte"))
b = bytes.Replace(b, s, newNames, 1)
}
// 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)
// If we have an empty RISCVHWProbePairs struct, we should delete it. Only riscv64 emits
// nonempty RISCVHWProbePairs structs.
hwprobeRexexp := regexp.MustCompile(`type RISCVHWProbePairs struct {\s*}`)
b = hwprobeRexexp.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 [n]int8 to [n]byte in Statvfs_t and Statfs_t members to simplify
// conversion to string.
convertStatvfsRegex := regexp.MustCompile(`(([Ff]stype|[Mm]nton|[Mm]ntfrom)name|mntfromspec)(\s+)\[(\d+)\]int8`)
b = convertStatvfsRegex.ReplaceAll(b, []byte("$1$3[$4]byte"))
// Convert []int8 to []byte in device mapper ioctl interface
convertDmIoctlNames := regexp.MustCompile(`(Name|Uuid|Target_type|Data)(\s+)\[(\d+)\]u?int8`)
dmIoctlTypes := regexp.MustCompile(`type Dm(\S+) struct {[^}]*}`)
dmStructs := dmIoctlTypes.FindAll(b, -1)
for _, s := range dmStructs {
newNames := convertDmIoctlNames.ReplaceAll(s, []byte("$1$2[$3]byte"))
b = bytes.Replace(b, s, newNames, 1)
}
// Convert []int8 to []byte in EthtoolDrvinfo
convertEthtoolDrvinfoNames := regexp.MustCompile(`(Driver|Version|Fw_version|Bus_info|Erom_version|Reserved2)(\s+)\[(\d+)\]u?int8`)
ethtoolDrvinfoTypes := regexp.MustCompile(`type EthtoolDrvinfo struct {[^}]*}`)
ethtoolDrvinfoStructs := ethtoolDrvinfoTypes.FindAll(b, -1)
for _, s := range ethtoolDrvinfoStructs {
newNames := convertEthtoolDrvinfoNames.ReplaceAll(s, []byte("$1$2[$3]byte"))
b = bytes.Replace(b, s, newNames, 1)
}
// Convert []int8 to []byte in ctl_info ioctl interface
convertCtlInfoName := regexp.MustCompile(`(Name)(\s+)\[(\d+)\]int8`)
ctlInfoType := regexp.MustCompile(`type CtlInfo struct {[^}]*}`)
ctlInfoStructs := ctlInfoType.FindAll(b, -1)
for _, s := range ctlInfoStructs {
newNames := convertCtlInfoName.ReplaceAll(s, []byte("$1$2[$3]byte"))
b = bytes.Replace(b, s, newNames, 1)
}
// 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(`$1 | go run mkpost.go
// Code generated by the command above; see README.md. DO NOT EDIT.
//go:build %s && %s`, goarch, goos)
cgoCommandRegex := regexp.MustCompile(`(cgo -godefs .*)`)
b = cgoCommandRegex.ReplaceAll(b, []byte(replacement))
// Rename Stat_t time fields
if goos == "freebsd" && goarch == "386" {
// Hide Stat_t.[AMCB]tim_ext fields
renameStatTimeExtFieldsRegex := regexp.MustCompile(`[AMCB]tim_ext`)
b = renameStatTimeExtFieldsRegex.ReplaceAll(b, []byte("_"))
}
renameStatTimeFieldsRegex := regexp.MustCompile(`([AMCB])(?:irth)?time?(?:spec)?\s+(Timespec|StTimespec)`)
b = renameStatTimeFieldsRegex.ReplaceAll(b, []byte("${1}tim ${2}"))
// gofmt
b, err = format.Source(b)
if err != nil {
log.Fatal(err)
}
os.Stdout.Write(b)
}
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