--- /dev/null
+// Copyright 2019 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
+
+/*
+This program reads a file containing function prototypes
+(like syscall_aix.go) and generates system call bodies.
+The prototypes are marked by lines beginning with "//sys"
+and read like func declarations if //sys is replaced by func, but:
+ * The parameter lists must give a name for each argument.
+ This includes return parameters.
+ * The parameter lists must give a type for each argument:
+ the (x, y, z int) shorthand is not allowed.
+ * If the return parameter is an error number, it must be named err.
+ * If go func name needs to be different than its libc name,
+ * or the function is not in libc, name could be specified
+ * at the end, after "=" sign, like
+ //sys getsockopt(s int, level int, name int, val uintptr, vallen *_Socklen) (err error) = libsocket.getsockopt
+*/
+package main
+
+import (
+ "bufio"
+ "flag"
+ "fmt"
+ "os"
+ "regexp"
+ "strings"
+)
+
+var (
+ b32 = flag.Bool("b32", false, "32bit big-endian")
+ l32 = flag.Bool("l32", false, "32bit little-endian")
+ aix = flag.Bool("aix", false, "aix")
+ tags = flag.String("tags", "", "build tags")
+)
+
+// cmdLine returns this programs's commandline arguments
+func cmdLine() string {
+ return "go run mksyscall_aix_ppc.go " + strings.Join(os.Args[1:], " ")
+}
+
+// buildTags returns build tags
+func buildTags() string {
+ return *tags
+}
+
+// Param is function parameter
+type Param struct {
+ Name string
+ Type string
+}
+
+// usage prints the program usage
+func usage() {
+ fmt.Fprintf(os.Stderr, "usage: go run mksyscall_aix_ppc.go [-b32 | -l32] [-tags x,y] [file ...]\n")
+ os.Exit(1)
+}
+
+// parseParamList parses parameter list and returns a slice of parameters
+func parseParamList(list string) []string {
+ list = strings.TrimSpace(list)
+ if list == "" {
+ return []string{}
+ }
+ return regexp.MustCompile(`\s*,\s*`).Split(list, -1)
+}
+
+// parseParam splits a parameter into name and type
+func parseParam(p string) Param {
+ ps := regexp.MustCompile(`^(\S*) (\S*)$`).FindStringSubmatch(p)
+ if ps == nil {
+ fmt.Fprintf(os.Stderr, "malformed parameter: %s\n", p)
+ os.Exit(1)
+ }
+ return Param{ps[1], ps[2]}
+}
+
+func main() {
+ flag.Usage = usage
+ flag.Parse()
+ if len(flag.Args()) <= 0 {
+ fmt.Fprintf(os.Stderr, "no files to parse provided\n")
+ usage()
+ }
+
+ endianness := ""
+ if *b32 {
+ endianness = "big-endian"
+ } else if *l32 {
+ endianness = "little-endian"
+ }
+
+ pack := ""
+ text := ""
+ cExtern := "/*\n#include <stdint.h>\n#include <stddef.h>\n"
+ for _, path := range flag.Args() {
+ file, err := os.Open(path)
+ if err != nil {
+ fmt.Fprintf(os.Stderr, err.Error())
+ os.Exit(1)
+ }
+ s := bufio.NewScanner(file)
+ for s.Scan() {
+ t := s.Text()
+ t = strings.TrimSpace(t)
+ t = regexp.MustCompile(`\s+`).ReplaceAllString(t, ` `)
+ if p := regexp.MustCompile(`^package (\S+)$`).FindStringSubmatch(t); p != nil && pack == "" {
+ pack = p[1]
+ }
+ nonblock := regexp.MustCompile(`^\/\/sysnb `).FindStringSubmatch(t)
+ if regexp.MustCompile(`^\/\/sys `).FindStringSubmatch(t) == nil && nonblock == nil {
+ continue
+ }
+
+ // Line must be of the form
+ // func Open(path string, mode int, perm int) (fd int, err error)
+ // Split into name, in params, out params.
+ f := regexp.MustCompile(`^\/\/sys(nb)? (\w+)\(([^()]*)\)\s*(?:\(([^()]+)\))?\s*(?:=\s*(?:(\w*)\.)?(\w*))?$`).FindStringSubmatch(t)
+ if f == nil {
+ fmt.Fprintf(os.Stderr, "%s:%s\nmalformed //sys declaration\n", path, t)
+ os.Exit(1)
+ }
+ funct, inps, outps, modname, sysname := f[2], f[3], f[4], f[5], f[6]
+
+ // Split argument lists on comma.
+ in := parseParamList(inps)
+ out := parseParamList(outps)
+
+ inps = strings.Join(in, ", ")
+ outps = strings.Join(out, ", ")
+
+ // Try in vain to keep people from editing this file.
+ // The theory is that they jump into the middle of the file
+ // without reading the header.
+ text += "// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n\n"
+
+ // Check if value return, err return available
+ errvar := ""
+ retvar := ""
+ rettype := ""
+ for _, param := range out {
+ p := parseParam(param)
+ if p.Type == "error" {
+ errvar = p.Name
+ } else {
+ retvar = p.Name
+ rettype = p.Type
+ }
+ }
+
+ // System call name.
+ if sysname == "" {
+ sysname = funct
+ }
+ sysname = regexp.MustCompile(`([a-z])([A-Z])`).ReplaceAllString(sysname, `${1}_$2`)
+ sysname = strings.ToLower(sysname) // All libc functions are lowercase.
+
+ cRettype := ""
+ if rettype == "unsafe.Pointer" {
+ cRettype = "uintptr_t"
+ } else if rettype == "uintptr" {
+ cRettype = "uintptr_t"
+ } else if regexp.MustCompile(`^_`).FindStringSubmatch(rettype) != nil {
+ cRettype = "uintptr_t"
+ } else if rettype == "int" {
+ cRettype = "int"
+ } else if rettype == "int32" {
+ cRettype = "int"
+ } else if rettype == "int64" {
+ cRettype = "long long"
+ } else if rettype == "uint32" {
+ cRettype = "unsigned int"
+ } else if rettype == "uint64" {
+ cRettype = "unsigned long long"
+ } else {
+ cRettype = "int"
+ }
+ if sysname == "exit" {
+ cRettype = "void"
+ }
+
+ // Change p.Types to c
+ var cIn []string
+ for _, param := range in {
+ p := parseParam(param)
+ if regexp.MustCompile(`^\*`).FindStringSubmatch(p.Type) != nil {
+ cIn = append(cIn, "uintptr_t")
+ } else if p.Type == "string" {
+ cIn = append(cIn, "uintptr_t")
+ } else if regexp.MustCompile(`^\[\](.*)`).FindStringSubmatch(p.Type) != nil {
+ cIn = append(cIn, "uintptr_t", "size_t")
+ } else if p.Type == "unsafe.Pointer" {
+ cIn = append(cIn, "uintptr_t")
+ } else if p.Type == "uintptr" {
+ cIn = append(cIn, "uintptr_t")
+ } else if regexp.MustCompile(`^_`).FindStringSubmatch(p.Type) != nil {
+ cIn = append(cIn, "uintptr_t")
+ } else if p.Type == "int" {
+ cIn = append(cIn, "int")
+ } else if p.Type == "int32" {
+ cIn = append(cIn, "int")
+ } else if p.Type == "int64" {
+ cIn = append(cIn, "long long")
+ } else if p.Type == "uint32" {
+ cIn = append(cIn, "unsigned int")
+ } else if p.Type == "uint64" {
+ cIn = append(cIn, "unsigned long long")
+ } else {
+ cIn = append(cIn, "int")
+ }
+ }
+
+ if funct != "fcntl" && funct != "FcntlInt" && funct != "readlen" && funct != "writelen" {
+ if sysname == "select" {
+ // select is a keyword of Go. Its name is
+ // changed to c_select.
+ cExtern += "#define c_select select\n"
+ }
+ // Imports of system calls from libc
+ cExtern += fmt.Sprintf("%s %s", cRettype, sysname)
+ cIn := strings.Join(cIn, ", ")
+ cExtern += fmt.Sprintf("(%s);\n", cIn)
+ }
+
+ // So file name.
+ if *aix {
+ if modname == "" {
+ modname = "libc.a/shr_64.o"
+ } else {
+ fmt.Fprintf(os.Stderr, "%s: only syscall using libc are available\n", funct)
+ os.Exit(1)
+ }
+ }
+
+ strconvfunc := "C.CString"
+
+ // Go function header.
+ if outps != "" {
+ outps = fmt.Sprintf(" (%s)", outps)
+ }
+ if text != "" {
+ text += "\n"
+ }
+
+ text += fmt.Sprintf("func %s(%s)%s {\n", funct, strings.Join(in, ", "), outps)
+
+ // Prepare arguments to Syscall.
+ var args []string
+ n := 0
+ argN := 0
+ for _, param := range in {
+ p := parseParam(param)
+ if regexp.MustCompile(`^\*`).FindStringSubmatch(p.Type) != nil {
+ args = append(args, "C.uintptr_t(uintptr(unsafe.Pointer("+p.Name+")))")
+ } else if p.Type == "string" && errvar != "" {
+ text += fmt.Sprintf("\t_p%d := uintptr(unsafe.Pointer(%s(%s)))\n", n, strconvfunc, p.Name)
+ args = append(args, fmt.Sprintf("C.uintptr_t(_p%d)", n))
+ n++
+ } else if p.Type == "string" {
+ fmt.Fprintf(os.Stderr, path+":"+funct+" uses string arguments, but has no error return\n")
+ text += fmt.Sprintf("\t_p%d := uintptr(unsafe.Pointer(%s(%s)))\n", n, strconvfunc, p.Name)
+ args = append(args, fmt.Sprintf("C.uintptr_t(_p%d)", n))
+ n++
+ } else if m := regexp.MustCompile(`^\[\](.*)`).FindStringSubmatch(p.Type); m != nil {
+ // Convert slice into pointer, length.
+ // Have to be careful not to take address of &a[0] if len == 0:
+ // pass nil in that case.
+ text += fmt.Sprintf("\tvar _p%d *%s\n", n, m[1])
+ text += fmt.Sprintf("\tif len(%s) > 0 {\n\t\t_p%d = &%s[0]\n\t}\n", p.Name, n, p.Name)
+ args = append(args, fmt.Sprintf("C.uintptr_t(uintptr(unsafe.Pointer(_p%d)))", n))
+ n++
+ text += fmt.Sprintf("\tvar _p%d int\n", n)
+ text += fmt.Sprintf("\t_p%d = len(%s)\n", n, p.Name)
+ args = append(args, fmt.Sprintf("C.size_t(_p%d)", n))
+ n++
+ } else if p.Type == "int64" && endianness != "" {
+ if endianness == "big-endian" {
+ args = append(args, fmt.Sprintf("uintptr(%s>>32)", p.Name), fmt.Sprintf("uintptr(%s)", p.Name))
+ } else {
+ args = append(args, fmt.Sprintf("uintptr(%s)", p.Name), fmt.Sprintf("uintptr(%s>>32)", p.Name))
+ }
+ n++
+ } else if p.Type == "bool" {
+ text += fmt.Sprintf("\tvar _p%d uint32\n", n)
+ text += fmt.Sprintf("\tif %s {\n\t\t_p%d = 1\n\t} else {\n\t\t_p%d = 0\n\t}\n", p.Name, n, n)
+ args = append(args, fmt.Sprintf("_p%d", n))
+ } else if regexp.MustCompile(`^_`).FindStringSubmatch(p.Type) != nil {
+ args = append(args, fmt.Sprintf("C.uintptr_t(uintptr(%s))", p.Name))
+ } else if p.Type == "unsafe.Pointer" {
+ args = append(args, fmt.Sprintf("C.uintptr_t(uintptr(%s))", p.Name))
+ } else if p.Type == "int" {
+ if (argN == 2) && ((funct == "readlen") || (funct == "writelen")) {
+ args = append(args, fmt.Sprintf("C.size_t(%s)", p.Name))
+ } else if argN == 0 && funct == "fcntl" {
+ args = append(args, fmt.Sprintf("C.uintptr_t(%s)", p.Name))
+ } else if (argN == 2) && ((funct == "fcntl") || (funct == "FcntlInt")) {
+ args = append(args, fmt.Sprintf("C.uintptr_t(%s)", p.Name))
+ } else {
+ args = append(args, fmt.Sprintf("C.int(%s)", p.Name))
+ }
+ } else if p.Type == "int32" {
+ args = append(args, fmt.Sprintf("C.int(%s)", p.Name))
+ } else if p.Type == "int64" {
+ args = append(args, fmt.Sprintf("C.longlong(%s)", p.Name))
+ } else if p.Type == "uint32" {
+ args = append(args, fmt.Sprintf("C.uint(%s)", p.Name))
+ } else if p.Type == "uint64" {
+ args = append(args, fmt.Sprintf("C.ulonglong(%s)", p.Name))
+ } else if p.Type == "uintptr" {
+ args = append(args, fmt.Sprintf("C.uintptr_t(%s)", p.Name))
+ } else {
+ args = append(args, fmt.Sprintf("C.int(%s)", p.Name))
+ }
+ argN++
+ }
+
+ // Actual call.
+ arglist := strings.Join(args, ", ")
+ call := ""
+ if sysname == "exit" {
+ if errvar != "" {
+ call += "er :="
+ } else {
+ call += ""
+ }
+ } else if errvar != "" {
+ call += "r0,er :="
+ } else if retvar != "" {
+ call += "r0,_ :="
+ } else {
+ call += ""
+ }
+ if sysname == "select" {
+ // select is a keyword of Go. Its name is
+ // changed to c_select.
+ call += fmt.Sprintf("C.c_%s(%s)", sysname, arglist)
+ } else {
+ call += fmt.Sprintf("C.%s(%s)", sysname, arglist)
+ }
+
+ // Assign return values.
+ body := ""
+ for i := 0; i < len(out); i++ {
+ p := parseParam(out[i])
+ reg := ""
+ if p.Name == "err" {
+ reg = "e1"
+ } else {
+ reg = "r0"
+ }
+ if reg != "e1" {
+ body += fmt.Sprintf("\t%s = %s(%s)\n", p.Name, p.Type, reg)
+ }
+ }
+
+ // verify return
+ if sysname != "exit" && errvar != "" {
+ if regexp.MustCompile(`^uintptr`).FindStringSubmatch(cRettype) != nil {
+ body += "\tif (uintptr(r0) ==^uintptr(0) && er != nil) {\n"
+ body += fmt.Sprintf("\t\t%s = er\n", errvar)
+ body += "\t}\n"
+ } else {
+ body += "\tif (r0 ==-1 && er != nil) {\n"
+ body += fmt.Sprintf("\t\t%s = er\n", errvar)
+ body += "\t}\n"
+ }
+ } else if errvar != "" {
+ body += "\tif (er != nil) {\n"
+ body += fmt.Sprintf("\t\t%s = er\n", errvar)
+ body += "\t}\n"
+ }
+
+ text += fmt.Sprintf("\t%s\n", call)
+ text += body
+
+ text += "\treturn\n"
+ text += "}\n"
+ }
+ if err := s.Err(); err != nil {
+ fmt.Fprintf(os.Stderr, err.Error())
+ os.Exit(1)
+ }
+ file.Close()
+ }
+ imp := ""
+ if pack != "unix" {
+ imp = "import \"golang.org/x/sys/unix\"\n"
+
+ }
+ fmt.Printf(srcTemplate, cmdLine(), buildTags(), pack, cExtern, imp, text)
+}
+
+const srcTemplate = `// %s
+// Code generated by the command above; see README.md. DO NOT EDIT.
+
+// +build %s
+
+package %s
+
+
+%s
+*/
+import "C"
+import (
+ "unsafe"
+)
+
+
+%s
+
+%s
+`
projects / dotfiles / .git / blobdiff