github.com/go-xe2/third@v1.0.3/golang.org/x/sys/unix/mksyscall_aix_ppc.go (about) 1 // Copyright 2019 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 // +build ignore 6 7 /* 8 This program reads a file containing function prototypes 9 (like syscall_aix.go) and generates system call bodies. 10 The prototypes are marked by lines beginning with "//sys" 11 and read like func declarations if //sys is replaced by func, but: 12 * The parameter lists must give a name for each argument. 13 This includes return parameters. 14 * The parameter lists must give a type for each argument: 15 the (x, y, z int) shorthand is not allowed. 16 * If the return parameter is an error number, it must be named err. 17 * If go func name needs to be different than its libc name, 18 * or the function is not in libc, name could be specified 19 * at the end, after "=" sign, like 20 //sys getsockopt(s int, level int, name int, val uintptr, vallen *_Socklen) (err error) = libsocket.getsockopt 21 */ 22 package main 23 24 import ( 25 "bufio" 26 "flag" 27 "fmt" 28 "os" 29 "regexp" 30 "strings" 31 ) 32 33 var ( 34 b32 = flag.Bool("b32", false, "32bit big-endian") 35 l32 = flag.Bool("l32", false, "32bit little-endian") 36 aix = flag.Bool("aix", false, "aix") 37 tags = flag.String("tags", "", "build tags") 38 ) 39 40 // cmdLine returns this programs's commandline arguments 41 func cmdLine() string { 42 return "go run mksyscall_aix_ppc.go " + strings.Join(os.Args[1:], " ") 43 } 44 45 // buildTags returns build tags 46 func buildTags() string { 47 return *tags 48 } 49 50 // Param is function parameter 51 type Param struct { 52 Name string 53 Type string 54 } 55 56 // usage prints the program usage 57 func usage() { 58 fmt.Fprintf(os.Stderr, "usage: go run mksyscall_aix_ppc.go [-b32 | -l32] [-tags x,y] [file ...]\n") 59 os.Exit(1) 60 } 61 62 // parseParamList parses parameter list and returns a slice of parameters 63 func parseParamList(list string) []string { 64 list = strings.TrimSpace(list) 65 if list == "" { 66 return []string{} 67 } 68 return regexp.MustCompile(`\s*,\s*`).Split(list, -1) 69 } 70 71 // parseParam splits a parameter into name and type 72 func parseParam(p string) Param { 73 ps := regexp.MustCompile(`^(\S*) (\S*)$`).FindStringSubmatch(p) 74 if ps == nil { 75 fmt.Fprintf(os.Stderr, "malformed parameter: %s\n", p) 76 os.Exit(1) 77 } 78 return Param{ps[1], ps[2]} 79 } 80 81 func main() { 82 flag.Usage = usage 83 flag.Parse() 84 if len(flag.Args()) <= 0 { 85 fmt.Fprintf(os.Stderr, "no files to parse provided\n") 86 usage() 87 } 88 89 endianness := "" 90 if *b32 { 91 endianness = "big-endian" 92 } else if *l32 { 93 endianness = "little-endian" 94 } 95 96 pack := "" 97 text := "" 98 cExtern := "/*\n#include <stdint.h>\n#include <stddef.h>\n" 99 for _, path := range flag.Args() { 100 file, err := os.Open(path) 101 if err != nil { 102 fmt.Fprintf(os.Stderr, err.Error()) 103 os.Exit(1) 104 } 105 s := bufio.NewScanner(file) 106 for s.Scan() { 107 t := s.Text() 108 t = strings.TrimSpace(t) 109 t = regexp.MustCompile(`\s+`).ReplaceAllString(t, ` `) 110 if p := regexp.MustCompile(`^package (\S+)$`).FindStringSubmatch(t); p != nil && pack == "" { 111 pack = p[1] 112 } 113 nonblock := regexp.MustCompile(`^\/\/sysnb `).FindStringSubmatch(t) 114 if regexp.MustCompile(`^\/\/sys `).FindStringSubmatch(t) == nil && nonblock == nil { 115 continue 116 } 117 118 // Line must be of the form 119 // func Open(path string, mode int, perm int) (fd int, err error) 120 // Split into name, in params, out params. 121 f := regexp.MustCompile(`^\/\/sys(nb)? (\w+)\(([^()]*)\)\s*(?:\(([^()]+)\))?\s*(?:=\s*(?:(\w*)\.)?(\w*))?$`).FindStringSubmatch(t) 122 if f == nil { 123 fmt.Fprintf(os.Stderr, "%s:%s\nmalformed //sys declaration\n", path, t) 124 os.Exit(1) 125 } 126 funct, inps, outps, modname, sysname := f[2], f[3], f[4], f[5], f[6] 127 128 // Split argument lists on comma. 129 in := parseParamList(inps) 130 out := parseParamList(outps) 131 132 inps = strings.Join(in, ", ") 133 outps = strings.Join(out, ", ") 134 135 // Try in vain to keep people from editing this file. 136 // The theory is that they jump into the middle of the file 137 // without reading the header. 138 text += "// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n\n" 139 140 // Check if value return, err return available 141 errvar := "" 142 retvar := "" 143 rettype := "" 144 for _, param := range out { 145 p := parseParam(param) 146 if p.Type == "error" { 147 errvar = p.Name 148 } else { 149 retvar = p.Name 150 rettype = p.Type 151 } 152 } 153 154 // System call name. 155 if sysname == "" { 156 sysname = funct 157 } 158 sysname = regexp.MustCompile(`([a-z])([A-Z])`).ReplaceAllString(sysname, `${1}_$2`) 159 sysname = strings.ToLower(sysname) // All libc functions are lowercase. 160 161 cRettype := "" 162 if rettype == "unsafe.Pointer" { 163 cRettype = "uintptr_t" 164 } else if rettype == "uintptr" { 165 cRettype = "uintptr_t" 166 } else if regexp.MustCompile(`^_`).FindStringSubmatch(rettype) != nil { 167 cRettype = "uintptr_t" 168 } else if rettype == "int" { 169 cRettype = "int" 170 } else if rettype == "int32" { 171 cRettype = "int" 172 } else if rettype == "int64" { 173 cRettype = "long long" 174 } else if rettype == "uint32" { 175 cRettype = "unsigned int" 176 } else if rettype == "uint64" { 177 cRettype = "unsigned long long" 178 } else { 179 cRettype = "int" 180 } 181 if sysname == "exit" { 182 cRettype = "void" 183 } 184 185 // Change p.Types to c 186 var cIn []string 187 for _, param := range in { 188 p := parseParam(param) 189 if regexp.MustCompile(`^\*`).FindStringSubmatch(p.Type) != nil { 190 cIn = append(cIn, "uintptr_t") 191 } else if p.Type == "string" { 192 cIn = append(cIn, "uintptr_t") 193 } else if regexp.MustCompile(`^\[\](.*)`).FindStringSubmatch(p.Type) != nil { 194 cIn = append(cIn, "uintptr_t", "size_t") 195 } else if p.Type == "unsafe.Pointer" { 196 cIn = append(cIn, "uintptr_t") 197 } else if p.Type == "uintptr" { 198 cIn = append(cIn, "uintptr_t") 199 } else if regexp.MustCompile(`^_`).FindStringSubmatch(p.Type) != nil { 200 cIn = append(cIn, "uintptr_t") 201 } else if p.Type == "int" { 202 cIn = append(cIn, "int") 203 } else if p.Type == "int32" { 204 cIn = append(cIn, "int") 205 } else if p.Type == "int64" { 206 cIn = append(cIn, "long long") 207 } else if p.Type == "uint32" { 208 cIn = append(cIn, "unsigned int") 209 } else if p.Type == "uint64" { 210 cIn = append(cIn, "unsigned long long") 211 } else { 212 cIn = append(cIn, "int") 213 } 214 } 215 216 if funct != "fcntl" && funct != "FcntlInt" && funct != "readlen" && funct != "writelen" { 217 // Imports of system calls from libc 218 cExtern += fmt.Sprintf("%s %s", cRettype, sysname) 219 cIn := strings.Join(cIn, ", ") 220 cExtern += fmt.Sprintf("(%s);\n", cIn) 221 } 222 223 // So file name. 224 if *aix { 225 if modname == "" { 226 modname = "libc.a/shr_64.o" 227 } else { 228 fmt.Fprintf(os.Stderr, "%s: only syscall using libc are available\n", funct) 229 os.Exit(1) 230 } 231 } 232 233 strconvfunc := "C.CString" 234 235 // Go function header. 236 if outps != "" { 237 outps = fmt.Sprintf(" (%s)", outps) 238 } 239 if text != "" { 240 text += "\n" 241 } 242 243 text += fmt.Sprintf("func %s(%s)%s {\n", funct, strings.Join(in, ", "), outps) 244 245 // Prepare arguments to Syscall. 246 var args []string 247 n := 0 248 argN := 0 249 for _, param := range in { 250 p := parseParam(param) 251 if regexp.MustCompile(`^\*`).FindStringSubmatch(p.Type) != nil { 252 args = append(args, "C.uintptr_t(uintptr(unsafe.Pointer("+p.Name+")))") 253 } else if p.Type == "string" && errvar != "" { 254 text += fmt.Sprintf("\t_p%d := uintptr(unsafe.Pointer(%s(%s)))\n", n, strconvfunc, p.Name) 255 args = append(args, fmt.Sprintf("C.uintptr_t(_p%d)", n)) 256 n++ 257 } else if p.Type == "string" { 258 fmt.Fprintf(os.Stderr, path+":"+funct+" uses string arguments, but has no error return\n") 259 text += fmt.Sprintf("\t_p%d := uintptr(unsafe.Pointer(%s(%s)))\n", n, strconvfunc, p.Name) 260 args = append(args, fmt.Sprintf("C.uintptr_t(_p%d)", n)) 261 n++ 262 } else if m := regexp.MustCompile(`^\[\](.*)`).FindStringSubmatch(p.Type); m != nil { 263 // Convert slice into pointer, length. 264 // Have to be careful not to take address of &a[0] if len == 0: 265 // pass nil in that case. 266 text += fmt.Sprintf("\tvar _p%d *%s\n", n, m[1]) 267 text += fmt.Sprintf("\tif len(%s) > 0 {\n\t\t_p%d = &%s[0]\n\t}\n", p.Name, n, p.Name) 268 args = append(args, fmt.Sprintf("C.uintptr_t(uintptr(unsafe.Pointer(_p%d)))", n)) 269 n++ 270 text += fmt.Sprintf("\tvar _p%d int\n", n) 271 text += fmt.Sprintf("\t_p%d = len(%s)\n", n, p.Name) 272 args = append(args, fmt.Sprintf("C.size_t(_p%d)", n)) 273 n++ 274 } else if p.Type == "int64" && endianness != "" { 275 if endianness == "big-endian" { 276 args = append(args, fmt.Sprintf("uintptr(%s>>32)", p.Name), fmt.Sprintf("uintptr(%s)", p.Name)) 277 } else { 278 args = append(args, fmt.Sprintf("uintptr(%s)", p.Name), fmt.Sprintf("uintptr(%s>>32)", p.Name)) 279 } 280 n++ 281 } else if p.Type == "bool" { 282 text += fmt.Sprintf("\tvar _p%d uint32\n", n) 283 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) 284 args = append(args, fmt.Sprintf("_p%d", n)) 285 } else if regexp.MustCompile(`^_`).FindStringSubmatch(p.Type) != nil { 286 args = append(args, fmt.Sprintf("C.uintptr_t(uintptr(%s))", p.Name)) 287 } else if p.Type == "unsafe.Pointer" { 288 args = append(args, fmt.Sprintf("C.uintptr_t(uintptr(%s))", p.Name)) 289 } else if p.Type == "int" { 290 if (argN == 2) && ((funct == "readlen") || (funct == "writelen")) { 291 args = append(args, fmt.Sprintf("C.size_t(%s)", p.Name)) 292 } else if argN == 0 && funct == "fcntl" { 293 args = append(args, fmt.Sprintf("C.uintptr_t(%s)", p.Name)) 294 } else if (argN == 2) && ((funct == "fcntl") || (funct == "FcntlInt")) { 295 args = append(args, fmt.Sprintf("C.uintptr_t(%s)", p.Name)) 296 } else { 297 args = append(args, fmt.Sprintf("C.int(%s)", p.Name)) 298 } 299 } else if p.Type == "int32" { 300 args = append(args, fmt.Sprintf("C.int(%s)", p.Name)) 301 } else if p.Type == "int64" { 302 args = append(args, fmt.Sprintf("C.longlong(%s)", p.Name)) 303 } else if p.Type == "uint32" { 304 args = append(args, fmt.Sprintf("C.uint(%s)", p.Name)) 305 } else if p.Type == "uint64" { 306 args = append(args, fmt.Sprintf("C.ulonglong(%s)", p.Name)) 307 } else if p.Type == "uintptr" { 308 args = append(args, fmt.Sprintf("C.uintptr_t(%s)", p.Name)) 309 } else { 310 args = append(args, fmt.Sprintf("C.int(%s)", p.Name)) 311 } 312 argN++ 313 } 314 315 // Actual call. 316 arglist := strings.Join(args, ", ") 317 call := "" 318 if sysname == "exit" { 319 if errvar != "" { 320 call += "er :=" 321 } else { 322 call += "" 323 } 324 } else if errvar != "" { 325 call += "r0,er :=" 326 } else if retvar != "" { 327 call += "r0,_ :=" 328 } else { 329 call += "" 330 } 331 call += fmt.Sprintf("C.%s(%s)", sysname, arglist) 332 333 // Assign return values. 334 body := "" 335 for i := 0; i < len(out); i++ { 336 p := parseParam(out[i]) 337 reg := "" 338 if p.Name == "err" { 339 reg = "e1" 340 } else { 341 reg = "r0" 342 } 343 if reg != "e1" { 344 body += fmt.Sprintf("\t%s = %s(%s)\n", p.Name, p.Type, reg) 345 } 346 } 347 348 // verify return 349 if sysname != "exit" && errvar != "" { 350 if regexp.MustCompile(`^uintptr`).FindStringSubmatch(cRettype) != nil { 351 body += "\tif (uintptr(r0) ==^uintptr(0) && er != nil) {\n" 352 body += fmt.Sprintf("\t\t%s = er\n", errvar) 353 body += "\t}\n" 354 } else { 355 body += "\tif (r0 ==-1 && er != nil) {\n" 356 body += fmt.Sprintf("\t\t%s = er\n", errvar) 357 body += "\t}\n" 358 } 359 } else if errvar != "" { 360 body += "\tif (er != nil) {\n" 361 body += fmt.Sprintf("\t\t%s = er\n", errvar) 362 body += "\t}\n" 363 } 364 365 text += fmt.Sprintf("\t%s\n", call) 366 text += body 367 368 text += "\treturn\n" 369 text += "}\n" 370 } 371 if err := s.Err(); err != nil { 372 fmt.Fprintf(os.Stderr, err.Error()) 373 os.Exit(1) 374 } 375 file.Close() 376 } 377 imp := "" 378 if pack != "unix" { 379 imp = "import \"github.com/go-xe2/third/golang.org/x/sys/unix\"\n" 380 381 } 382 fmt.Printf(srcTemplate, cmdLine(), buildTags(), pack, cExtern, imp, text) 383 } 384 385 const srcTemplate = `// %s 386 // Code generated by the command above; see README.md. DO NOT EDIT. 387 388 // +build %s 389 390 package %s 391 392 393 %s 394 */ 395 import "C" 396 import ( 397 "unsafe" 398 ) 399 400 401 %s 402 403 %s 404 `