Serge Bazanski | cc25bdf | 2018-10-25 14:02:58 +0200 | [diff] [blame] | 1 | #!/usr/bin/env perl |
| 2 | # Copyright 2018 The Go Authors. All rights reserved. |
| 3 | # Use of this source code is governed by a BSD-style |
| 4 | # license that can be found in the LICENSE file. |
| 5 | |
| 6 | # This program reads a file containing function prototypes |
| 7 | # (like syscall_aix.go) and generates system call bodies. |
| 8 | # The prototypes are marked by lines beginning with "//sys" |
| 9 | # and read like func declarations if //sys is replaced by func, but: |
| 10 | # * The parameter lists must give a name for each argument. |
| 11 | # This includes return parameters. |
| 12 | # * The parameter lists must give a type for each argument: |
| 13 | # the (x, y, z int) shorthand is not allowed. |
| 14 | # * If the return parameter is an error number, it must be named err. |
| 15 | # * If go func name needs to be different than its libc name, |
| 16 | # * or the function is not in libc, name could be specified |
| 17 | # * at the end, after "=" sign, like |
| 18 | # //sys getsockopt(s int, level int, name int, val uintptr, vallen *_Socklen) (err error) = libsocket.getsockopt |
| 19 | |
| 20 | use strict; |
| 21 | |
| 22 | my $cmdline = "mksyscall_aix_ppc.pl " . join(' ', @ARGV); |
| 23 | my $errors = 0; |
| 24 | my $_32bit = ""; |
| 25 | my $tags = ""; # build tags |
| 26 | my $aix = 0; |
| 27 | my $solaris = 0; |
| 28 | |
| 29 | binmode STDOUT; |
| 30 | |
| 31 | if($ARGV[0] eq "-b32") { |
| 32 | $_32bit = "big-endian"; |
| 33 | shift; |
| 34 | } elsif($ARGV[0] eq "-l32") { |
| 35 | $_32bit = "little-endian"; |
| 36 | shift; |
| 37 | } |
| 38 | if($ARGV[0] eq "-aix") { |
| 39 | $aix = 1; |
| 40 | shift; |
| 41 | } |
| 42 | if($ARGV[0] eq "-tags") { |
| 43 | shift; |
| 44 | $tags = $ARGV[0]; |
| 45 | shift; |
| 46 | } |
| 47 | |
| 48 | if($ARGV[0] =~ /^-/) { |
| 49 | print STDERR "usage: mksyscall_aix.pl [-b32 | -l32] [-tags x,y] [file ...]\n"; |
| 50 | exit 1; |
| 51 | } |
| 52 | |
| 53 | sub parseparamlist($) { |
| 54 | my ($list) = @_; |
| 55 | $list =~ s/^\s*//; |
| 56 | $list =~ s/\s*$//; |
| 57 | if($list eq "") { |
| 58 | return (); |
| 59 | } |
| 60 | return split(/\s*,\s*/, $list); |
| 61 | } |
| 62 | |
| 63 | sub parseparam($) { |
| 64 | my ($p) = @_; |
| 65 | if($p !~ /^(\S*) (\S*)$/) { |
| 66 | print STDERR "$ARGV:$.: malformed parameter: $p\n"; |
| 67 | $errors = 1; |
| 68 | return ("xx", "int"); |
| 69 | } |
| 70 | return ($1, $2); |
| 71 | } |
| 72 | |
| 73 | my $package = ""; |
| 74 | my $text = ""; |
| 75 | my $c_extern = "/*\n#include <stdint.h>\n#include <stddef.h>\n"; |
| 76 | my @vars = (); |
| 77 | while(<>) { |
| 78 | chomp; |
| 79 | s/\s+/ /g; |
| 80 | s/^\s+//; |
| 81 | s/\s+$//; |
| 82 | $package = $1 if !$package && /^package (\S+)$/; |
| 83 | my $nonblock = /^\/\/sysnb /; |
| 84 | next if !/^\/\/sys / && !$nonblock; |
| 85 | |
| 86 | # Line must be of the form |
| 87 | # func Open(path string, mode int, perm int) (fd int, err error) |
| 88 | # Split into name, in params, out params. |
| 89 | if(!/^\/\/sys(nb)? (\w+)\(([^()]*)\)\s*(?:\(([^()]+)\))?\s*(?:=\s*(?:(\w*)\.)?(\w*))?$/) { |
| 90 | print STDERR "$ARGV:$.: malformed //sys declaration\n"; |
| 91 | $errors = 1; |
| 92 | next; |
| 93 | } |
| 94 | my ($nb, $func, $in, $out, $modname, $sysname) = ($1, $2, $3, $4, $5, $6); |
| 95 | |
| 96 | # Split argument lists on comma. |
| 97 | my @in = parseparamlist($in); |
| 98 | my @out = parseparamlist($out); |
| 99 | |
| 100 | $in = join(', ', @in); |
| 101 | $out = join(', ', @out); |
| 102 | |
| 103 | # Try in vain to keep people from editing this file. |
| 104 | # The theory is that they jump into the middle of the file |
| 105 | # without reading the header. |
| 106 | $text .= "// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n\n"; |
| 107 | |
| 108 | # Check if value return, err return available |
| 109 | my $errvar = ""; |
| 110 | my $retvar = ""; |
| 111 | my $rettype = ""; |
| 112 | foreach my $p (@out) { |
| 113 | my ($name, $type) = parseparam($p); |
| 114 | if($type eq "error") { |
| 115 | $errvar = $name; |
| 116 | } else { |
| 117 | $retvar = $name; |
| 118 | $rettype = $type; |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | # System call name. |
| 123 | #if($func ne "fcntl") { |
| 124 | |
| 125 | if($sysname eq "") { |
| 126 | $sysname = "$func"; |
| 127 | } |
| 128 | |
| 129 | $sysname =~ s/([a-z])([A-Z])/${1}_$2/g; |
| 130 | $sysname =~ y/A-Z/a-z/; # All libc functions are lowercase. |
| 131 | |
| 132 | my $C_rettype = ""; |
| 133 | if($rettype eq "unsafe.Pointer") { |
| 134 | $C_rettype = "uintptr_t"; |
| 135 | } elsif($rettype eq "uintptr") { |
| 136 | $C_rettype = "uintptr_t"; |
| 137 | } elsif($rettype =~ /^_/) { |
| 138 | $C_rettype = "uintptr_t"; |
| 139 | } elsif($rettype eq "int") { |
| 140 | $C_rettype = "int"; |
| 141 | } elsif($rettype eq "int32") { |
| 142 | $C_rettype = "int"; |
| 143 | } elsif($rettype eq "int64") { |
| 144 | $C_rettype = "long long"; |
| 145 | } elsif($rettype eq "uint32") { |
| 146 | $C_rettype = "unsigned int"; |
| 147 | } elsif($rettype eq "uint64") { |
| 148 | $C_rettype = "unsigned long long"; |
| 149 | } else { |
| 150 | $C_rettype = "int"; |
| 151 | } |
| 152 | if($sysname eq "exit") { |
| 153 | $C_rettype = "void"; |
| 154 | } |
| 155 | |
| 156 | # Change types to c |
| 157 | my @c_in = (); |
| 158 | foreach my $p (@in) { |
| 159 | my ($name, $type) = parseparam($p); |
| 160 | if($type =~ /^\*/) { |
| 161 | push @c_in, "uintptr_t"; |
| 162 | } elsif($type eq "string") { |
| 163 | push @c_in, "uintptr_t"; |
| 164 | } elsif($type =~ /^\[\](.*)/) { |
| 165 | push @c_in, "uintptr_t", "size_t"; |
| 166 | } elsif($type eq "unsafe.Pointer") { |
| 167 | push @c_in, "uintptr_t"; |
| 168 | } elsif($type eq "uintptr") { |
| 169 | push @c_in, "uintptr_t"; |
| 170 | } elsif($type =~ /^_/) { |
| 171 | push @c_in, "uintptr_t"; |
| 172 | } elsif($type eq "int") { |
| 173 | push @c_in, "int"; |
| 174 | } elsif($type eq "int32") { |
| 175 | push @c_in, "int"; |
| 176 | } elsif($type eq "int64") { |
| 177 | push @c_in, "long long"; |
| 178 | } elsif($type eq "uint32") { |
| 179 | push @c_in, "unsigned int"; |
| 180 | } elsif($type eq "uint64") { |
| 181 | push @c_in, "unsigned long long"; |
| 182 | } else { |
| 183 | push @c_in, "int"; |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | if ($func ne "fcntl" && $func ne "FcntlInt" && $func ne "readlen" && $func ne "writelen") { |
| 188 | # Imports of system calls from libc |
| 189 | $c_extern .= "$C_rettype $sysname"; |
| 190 | my $c_in = join(', ', @c_in); |
| 191 | $c_extern .= "($c_in);\n"; |
| 192 | } |
| 193 | |
| 194 | # So file name. |
| 195 | if($aix) { |
| 196 | if($modname eq "") { |
| 197 | $modname = "libc.a/shr_64.o"; |
| 198 | } else { |
| 199 | print STDERR "$func: only syscall using libc are available\n"; |
| 200 | $errors = 1; |
| 201 | next; |
| 202 | } |
| 203 | } |
| 204 | |
| 205 | my $strconvfunc = "C.CString"; |
| 206 | my $strconvtype = "*byte"; |
| 207 | |
| 208 | # Go function header. |
| 209 | if($out ne "") { |
| 210 | $out = " ($out)"; |
| 211 | } |
| 212 | if($text ne "") { |
| 213 | $text .= "\n" |
| 214 | } |
| 215 | |
| 216 | $text .= sprintf "func %s(%s)%s {\n", $func, join(', ', @in), $out ; |
| 217 | |
| 218 | # Prepare arguments to call. |
| 219 | my @args = (); |
| 220 | my $n = 0; |
| 221 | my $arg_n = 0; |
| 222 | foreach my $p (@in) { |
| 223 | my ($name, $type) = parseparam($p); |
| 224 | if($type =~ /^\*/) { |
| 225 | push @args, "C.uintptr_t(uintptr(unsafe.Pointer($name)))"; |
| 226 | } elsif($type eq "string" && $errvar ne "") { |
| 227 | $text .= "\t_p$n := uintptr(unsafe.Pointer($strconvfunc($name)))\n"; |
| 228 | push @args, "C.uintptr_t(_p$n)"; |
| 229 | $n++; |
| 230 | } elsif($type eq "string") { |
| 231 | print STDERR "$ARGV:$.: $func uses string arguments, but has no error return\n"; |
| 232 | $text .= "\t_p$n := uintptr(unsafe.Pointer($strconvfunc($name)))\n"; |
| 233 | push @args, "C.uintptr_t(_p$n)"; |
| 234 | $n++; |
| 235 | } elsif($type =~ /^\[\](.*)/) { |
| 236 | # Convert slice into pointer, length. |
| 237 | # Have to be careful not to take address of &a[0] if len == 0: |
| 238 | # pass nil in that case. |
| 239 | $text .= "\tvar _p$n *$1\n"; |
| 240 | $text .= "\tif len($name) > 0 {\n\t\t_p$n = \&$name\[0]\n\t}\n"; |
| 241 | push @args, "C.uintptr_t(uintptr(unsafe.Pointer(_p$n)))"; |
| 242 | $n++; |
| 243 | $text .= "\tvar _p$n int\n"; |
| 244 | $text .= "\t_p$n = len($name)\n"; |
| 245 | push @args, "C.size_t(_p$n)"; |
| 246 | $n++; |
| 247 | } elsif($type eq "int64" && $_32bit ne "") { |
| 248 | if($_32bit eq "big-endian") { |
| 249 | push @args, "uintptr($name >> 32)", "uintptr($name)"; |
| 250 | } else { |
| 251 | push @args, "uintptr($name)", "uintptr($name >> 32)"; |
| 252 | } |
| 253 | $n++; |
| 254 | } elsif($type eq "bool") { |
| 255 | $text .= "\tvar _p$n uint32\n"; |
| 256 | $text .= "\tif $name {\n\t\t_p$n = 1\n\t} else {\n\t\t_p$n = 0\n\t}\n"; |
| 257 | push @args, "_p$n"; |
| 258 | $n++; |
| 259 | } elsif($type =~ /^_/) { |
| 260 | push @args, "C.uintptr_t(uintptr($name))"; |
| 261 | } elsif($type eq "unsafe.Pointer") { |
| 262 | push @args, "C.uintptr_t(uintptr($name))"; |
| 263 | } elsif($type eq "int") { |
| 264 | if (($arg_n == 2) && (($func eq "readlen") || ($func eq "writelen"))) { |
| 265 | push @args, "C.size_t($name)"; |
| 266 | } elsif ($arg_n == 0 && $func eq "fcntl") { |
| 267 | push @args, "C.uintptr_t($name)"; |
| 268 | } elsif (($arg_n == 2) && (($func eq "fcntl") || ($func eq "FcntlInt"))) { |
| 269 | push @args, "C.uintptr_t($name)"; |
| 270 | } else { |
| 271 | push @args, "C.int($name)"; |
| 272 | } |
| 273 | } elsif($type eq "int32") { |
| 274 | push @args, "C.int($name)"; |
| 275 | } elsif($type eq "int64") { |
| 276 | push @args, "C.longlong($name)"; |
| 277 | } elsif($type eq "uint32") { |
| 278 | push @args, "C.uint($name)"; |
| 279 | } elsif($type eq "uint64") { |
| 280 | push @args, "C.ulonglong($name)"; |
| 281 | } elsif($type eq "uintptr") { |
| 282 | push @args, "C.uintptr_t($name)"; |
| 283 | } else { |
| 284 | push @args, "C.int($name)"; |
| 285 | } |
| 286 | $arg_n++; |
| 287 | } |
| 288 | my $nargs = @args; |
| 289 | |
| 290 | |
| 291 | # Determine which form to use; pad args with zeros. |
| 292 | if ($nonblock) { |
| 293 | } |
| 294 | |
| 295 | my $args = join(', ', @args); |
| 296 | my $call = ""; |
| 297 | if ($sysname eq "exit") { |
| 298 | if ($errvar ne "") { |
| 299 | $call .= "er :="; |
| 300 | } else { |
| 301 | $call .= ""; |
| 302 | } |
| 303 | } elsif ($errvar ne "") { |
| 304 | $call .= "r0,er :="; |
| 305 | } elsif ($retvar ne "") { |
| 306 | $call .= "r0,_ :="; |
| 307 | } else { |
| 308 | $call .= "" |
| 309 | } |
| 310 | $call .= "C.$sysname($args)"; |
| 311 | |
| 312 | # Assign return values. |
| 313 | my $body = ""; |
| 314 | my $failexpr = ""; |
| 315 | |
| 316 | for(my $i=0; $i<@out; $i++) { |
| 317 | my $p = $out[$i]; |
| 318 | my ($name, $type) = parseparam($p); |
| 319 | my $reg = ""; |
| 320 | if($name eq "err") { |
| 321 | $reg = "e1"; |
| 322 | } else { |
| 323 | $reg = "r0"; |
| 324 | } |
| 325 | if($reg ne "e1" ) { |
| 326 | $body .= "\t$name = $type($reg)\n"; |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | # verify return |
| 331 | if ($sysname ne "exit" && $errvar ne "") { |
| 332 | if ($C_rettype =~ /^uintptr/) { |
| 333 | $body .= "\tif \(uintptr\(r0\) ==\^uintptr\(0\) && er != nil\) {\n"; |
| 334 | $body .= "\t\t$errvar = er\n"; |
| 335 | $body .= "\t}\n"; |
| 336 | } else { |
| 337 | $body .= "\tif \(r0 ==-1 && er != nil\) {\n"; |
| 338 | $body .= "\t\t$errvar = er\n"; |
| 339 | $body .= "\t}\n"; |
| 340 | } |
| 341 | } elsif ($errvar ne "") { |
| 342 | $body .= "\tif \(er != nil\) {\n"; |
| 343 | $body .= "\t\t$errvar = er\n"; |
| 344 | $body .= "\t}\n"; |
| 345 | } |
| 346 | |
| 347 | $text .= "\t$call\n"; |
| 348 | $text .= $body; |
| 349 | |
| 350 | $text .= "\treturn\n"; |
| 351 | $text .= "}\n"; |
| 352 | } |
| 353 | |
| 354 | if($errors) { |
| 355 | exit 1; |
| 356 | } |
| 357 | |
| 358 | print <<EOF; |
| 359 | // $cmdline |
| 360 | // Code generated by the command above; see README.md. DO NOT EDIT. |
| 361 | |
| 362 | // +build $tags |
| 363 | |
| 364 | package $package |
| 365 | |
| 366 | |
| 367 | $c_extern |
| 368 | */ |
| 369 | import "C" |
| 370 | import ( |
| 371 | "unsafe" |
| 372 | ) |
| 373 | |
| 374 | |
| 375 | EOF |
| 376 | |
| 377 | print "import \"golang.org/x/sys/unix\"\n" if $package ne "unix"; |
| 378 | |
| 379 | chomp($_=<<EOF); |
| 380 | |
| 381 | $text |
| 382 | EOF |
| 383 | print $_; |
| 384 | exit 0; |