| // 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. |
| |
| //go:build ignore |
| // +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:], " ") |
| } |
| |
| // goBuildTags returns build tags in the go:build format. |
| func goBuildTags() string { |
| return strings.ReplaceAll(*tags, ",", " && ") |
| } |
| |
| // plusBuildTags returns build tags in the +build format. |
| func plusBuildTags() 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*)$`).FindStringSubmatch(p) |
| if ps == nil { |
| fmt.Fprintf(os.Stderr, "malformed parameter: %s\n", p) |
| os.Exit(1) |
| } |
| return Param{ps[1], ps[2]} |
| } |
| |
| func main() { |
| flag.Usage = usage |
| flag.Parse() |
| if len(flag.Args()) <= 0 { |
| fmt.Fprintf(os.Stderr, "no files to parse provided\n") |
| usage() |
| } |
| |
| endianness := "" |
| if *b32 { |
| endianness = "big-endian" |
| } else if *l32 { |
| endianness = "little-endian" |
| } |
| |
| pack := "" |
| text := "" |
| cExtern := "/*\n#include <stdint.h>\n#include <stddef.h>\n" |
| for _, path := range flag.Args() { |
| file, err := os.Open(path) |
| if err != nil { |
| fmt.Fprintf(os.Stderr, err.Error()) |
| os.Exit(1) |
| } |
| s := bufio.NewScanner(file) |
| for s.Scan() { |
| t := s.Text() |
| if p := regexp.MustCompile(`^package (\S+)$`).FindStringSubmatch(t); p != nil && pack == "" { |
| pack = p[1] |
| } |
| nonblock := regexp.MustCompile(`^\/\/sysnb\t`).FindStringSubmatch(t) |
| if regexp.MustCompile(`^\/\/sys\t`).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)?\t(\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" && funct != "ioctlPtr" { |
| 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(), goBuildTags(), plusBuildTags(), pack, cExtern, imp, text) |
| } |
| |
| const srcTemplate = `// %s |
| // Code generated by the command above; see README.md. DO NOT EDIT. |
| |
| //go:build %s |
| // +build %s |
| |
| package %s |
| |
| |
| %s |
| */ |
| import "C" |
| import ( |
| "unsafe" |
| ) |
| |
| |
| %s |
| |
| %s |
| ` |