Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/tools/makeobjops.awk
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1 #!/usr/bin/awk -f 2 3 #- 4 # SPDX-License-Identifier: BSD-3-Clause 5 # 6 # Copyright (c) 1992, 1993 7 # The Regents of the University of California. All rights reserved. 8 # 9 # Redistribution and use in source and binary forms, with or without 10 # modification, are permitted provided that the following conditions 11 # are met: 12 # 1. Redistributions of source code must retain the above copyright 13 # notice, this list of conditions and the following disclaimer. 14 # 2. Redistributions in binary form must reproduce the above copyright 15 # notice, this list of conditions and the following disclaimer in the 16 # documentation and/or other materials provided with the distribution. 17 # 3. Neither the name of the University nor the names of its contributors 18 # may be used to endorse or promote products derived from this software 19 # without specific prior written permission. 20 # 21 # THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 # ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 # SUCH DAMAGE. 32 # 33 # From @(#)vnode_if.sh 8.1 (Berkeley) 6/10/93 34 # From @(#)makedevops.sh 1.1 1998/06/14 13:53:12 dfr Exp $ 35 # From @(#)makedevops.sh ?.? 1998/10/05 36 # From src/sys/kern/makedevops.pl,v 1.12 1999/11/22 14:40:04 n_hibma Exp 37 # From src/sys/kern/makeobjops.pl,v 1.8 2001/11/16 02:02:42 joe Exp 38 # 39 # $FreeBSD$ 40 41 # 42 # Script to produce kobj front-end sugar. 43 # 44 45 function usage () 46 { 47 print "usage: makeobjops.awk <srcfile.m> [-d] [-p] [-l <nr>] [-c|-h]"; 48 print "where -c produce only .c files"; 49 print " -h produce only .h files"; 50 print " -p use the path component in the source file for destination dir"; 51 print " -l set line width for output files [80]"; 52 print " -d switch on debugging"; 53 exit 1; 54 } 55 56 function warn (msg) 57 { 58 print "makeobjops.awk:", msg > "/dev/stderr"; 59 } 60 61 function warnsrc (msg) 62 { 63 warn(src ":" lineno ": " msg); 64 } 65 66 function debug (msg) 67 { 68 if (opt_d) 69 warn(msg); 70 } 71 72 function die (msg) 73 { 74 warn(msg); 75 exit 1; 76 } 77 78 # These are just for convenience ... 79 function printc(s) {if (opt_c) print s > ctmpfilename;} 80 function printh(s) {if (opt_h) print s > htmpfilename;} 81 82 # 83 # If a line exceeds maxlength, split it into multiple 84 # lines at commas. Subsequent lines are indented by 85 # the specified number of spaces. 86 # 87 # In other words: Lines are split by replacing ", " 88 # by ",\n" plus indent spaces. 89 # 90 91 function format_line (line, maxlength, indent) 92 { 93 rline = ""; 94 95 while (length(line) > maxlength) { 96 # 97 # Find the rightmost ", " so that the part 98 # to the left of it is just within maxlength. 99 # If there is none, give up and leave it as-is. 100 # 101 if (!match(substr(line, 1, maxlength + 1), /^.*, /)) 102 break; 103 rline = rline substr(line, 1, RLENGTH - 1) "\n"; 104 line = sprintf("%*s", indent, "") substr(line, RLENGTH + 1); 105 } 106 return rline line; 107 } 108 109 # 110 # Join an array into a string. 111 # 112 113 function join (separator, array, num) 114 { 115 _result = "" 116 if (num) { 117 while (num > 1) 118 _result = separator array[num--] _result; 119 _result = array[1] _result; 120 } 121 return _result; 122 } 123 124 # 125 # Execute a system command and report if it failed. 126 # 127 128 function system_check (cmd) 129 { 130 if ((rc = system(cmd))) 131 warn(cmd " failed (" rc ")"); 132 } 133 134 # 135 # Handle "INTERFACE" line. 136 # 137 138 function handle_interface () 139 { 140 intname = $2; 141 sub(/;$/, "", intname); 142 if (intname !~ /^[a-z_][a-z0-9_]*$/) { 143 debug($0); 144 warnsrc("Invalid interface name '" intname "', use [a-z_][a-z0-9_]*"); 145 error = 1; 146 return; 147 } 148 if (!/;[ ]*$/) 149 warnsrc("Semicolon missing at end of line, no problem"); 150 151 debug("Interface " intname); 152 153 printh("#ifndef _" intname "_if_h_"); 154 printh("#define _" intname "_if_h_\n"); 155 printc("#include \"" intname "_if.h\"\n"); 156 } 157 158 # 159 # Pass doc comments through to the C file 160 # 161 function handle_doc () 162 { 163 doc = "" 164 while (!/\*\//) { 165 doc = doc $0 "\n"; 166 getline < src; 167 lineno++; 168 } 169 doc = doc $0 "\n"; 170 return doc; 171 } 172 173 # 174 # Handle "CODE" and "HEADER" sections. 175 # Returns the code as-is. 176 # 177 178 function handle_code () 179 { 180 code = "\n"; 181 getline < src; 182 indent = $0; 183 sub(/[^ ].*$/, "", indent); # find the indent used 184 while (!/^}/) { 185 sub("^" indent, ""); # remove the indent 186 code = code $0 "\n"; 187 getline < src; 188 lineno++;; 189 } 190 return code; 191 } 192 193 # 194 # Handle "METHOD" and "STATICMETHOD" sections. 195 # 196 197 function handle_method (static, doc) 198 { 199 # 200 # Get the return type and function name and delete that from 201 # the line. What is left is the possibly first function argument 202 # if it is on the same line. 203 # 204 if (!intname) { 205 warnsrc("No interface name defined"); 206 error = 1; 207 return; 208 } 209 sub(/^[^ ]+[ ]+/, ""); 210 ret = $0; 211 sub(/[ ]*\{.*$/, "", ret); 212 name = ret; 213 sub(/^.*[ ]/, "", name); # last element is name of method 214 sub(/[ ]+[^ ]+$/, "", ret); # return type 215 debug("Method: name=" name " return type=" ret); 216 217 sub(/^[^\{]*\{[ ]*/, ""); 218 219 if (!name || !ret) { 220 debug($0); 221 warnsrc("Invalid method specification"); 222 error = 1; 223 return; 224 } 225 226 if (name !~ /^[a-z_][a-z_0-9]*$/) { 227 warnsrc("Invalid method name '" name "', use [a-z_][a-z0-9_]*"); 228 error = 1; 229 return; 230 } 231 232 if (methods[name]) { 233 warnsrc("Duplicate method name"); 234 error = 1; 235 return; 236 } 237 methods[name] = name; 238 239 line = $0; 240 while (line !~ /\}/ && (getline < src) > 0) { 241 line = line " " $0; 242 lineno++ 243 } 244 245 default_function = ""; 246 if (!match(line, /\};?/)) { 247 warnsrc("Premature end of file"); 248 error = 1; 249 return; 250 } 251 extra = substr(line, RSTART + RLENGTH); 252 if (extra ~ /[ ]*DEFAULT[ ]*[a-zA-Z_][a-zA-Z_0-9]*[ ]*;/) { 253 default_function = extra; 254 sub(/.*DEFAULT[ ]*/, "", default_function); 255 sub(/[; ]+.*$/, "", default_function); 256 } 257 else if (extra && opt_d) { 258 # Warn about garbage at end of line. 259 warnsrc("Ignored '" extra "'"); 260 } 261 sub(/\};?.*$/, "", line); 262 263 # 264 # Create a list of variables without the types prepended. 265 # 266 sub(/^[ ]+/, "", line); # remove leading ... 267 sub(/[ ]+$/, "", line); # ... and trailing whitespace 268 gsub(/[ ]+/, " ", line); # remove double spaces 269 270 num_arguments = split(line, arguments, / *; */) - 1; 271 delete varnames; # list of varnames 272 num_varnames = 0; 273 for (i = 1; i <= num_arguments; i++) { 274 if (!arguments[i]) 275 continue; # skip argument if argument is empty 276 num_ar = split(arguments[i], ar, /[* ]+/); 277 if (num_ar < 2) { # only 1 word in argument? 278 warnsrc("no type for '" arguments[i] "'"); 279 error = 1; 280 return; 281 } 282 # Last element is name of variable. 283 varnames[++num_varnames] = ar[num_ar]; 284 } 285 286 argument_list = join(", ", arguments, num_arguments); 287 varname_list = join(", ", varnames, num_varnames); 288 289 if (opt_d) { 290 warn("Arguments: " argument_list); 291 warn("Varnames: " varname_list); 292 } 293 294 mname = intname "_" name; # method name 295 umname = toupper(mname); # uppercase method name 296 297 firstvar = varnames[1]; 298 299 if (default_function == "") 300 default_function = "kobj_error_method"; 301 302 # the method description 303 printh("/** @brief Unique descriptor for the " umname "() method */"); 304 printh("extern struct kobjop_desc " mname "_desc;"); 305 # the method typedef 306 printh("/** @brief A function implementing the " umname "() method */"); 307 prototype = "typedef " ret " " mname "_t("; 308 printh(format_line(prototype argument_list ");", 309 line_width, length(prototype))); 310 311 # Print out the method desc 312 printc("struct kobjop_desc " mname "_desc = {"); 313 printc("\t0, { &" mname "_desc, (kobjop_t)" default_function " }"); 314 printc("};\n"); 315 316 # Print out the method itself 317 printh(doc); 318 if (0) { # haven't chosen the format yet 319 printh("static __inline " ret " " umname "(" varname_list ")"); 320 printh("\t" join(";\n\t", arguments, num_arguments) ";"); 321 } 322 else { 323 prototype = "static __inline " ret " " umname "("; 324 printh(format_line(prototype argument_list ")", 325 line_width, length(prototype))); 326 } 327 printh("{"); 328 printh("\tkobjop_t _m;"); 329 if (ret != "void") 330 printh("\t" ret " rc;"); 331 if (!static) 332 firstvar = "((kobj_t)" firstvar ")"; 333 if (prolog != "") 334 printh(prolog); 335 printh("\tKOBJOPLOOKUP(" firstvar "->ops," mname ");"); 336 rceq = (ret != "void") ? "rc = " : ""; 337 printh("\t" rceq "((" mname "_t *) _m)(" varname_list ");"); 338 if (epilog != "") 339 printh(epilog); 340 if (ret != "void") 341 printh("\treturn (rc);"); 342 printh("}\n"); 343 } 344 345 # 346 # Begin of the main program. 347 # 348 349 BEGIN { 350 351 line_width = 80; 352 gerror = 0; 353 354 # 355 # Process the command line. 356 # 357 358 num_files = 0; 359 360 for (i = 1; i < ARGC; i++) { 361 if (ARGV[i] ~ /^-/) { 362 # 363 # awk doesn't have getopt(), so we have to do it ourselves. 364 # This is a bit clumsy, but it works. 365 # 366 for (j = 2; j <= length(ARGV[i]); j++) { 367 o = substr(ARGV[i], j, 1); 368 if (o == "c") opt_c = 1; 369 else if (o == "h") opt_h = 1; 370 else if (o == "p") opt_p = 1; 371 else if (o == "d") opt_d = 1; 372 else if (o == "l") { 373 if (length(ARGV[i]) > j) { 374 opt_l = substr(ARGV[i], j + 1); 375 break; 376 } 377 else { 378 if (++i < ARGC) 379 opt_l = ARGV[i]; 380 else 381 usage(); 382 } 383 } 384 else 385 usage(); 386 } 387 } 388 else if (ARGV[i] ~ /\.m$/) 389 filenames[num_files++] = ARGV[i]; 390 else 391 usage(); 392 } 393 394 if (!num_files || !(opt_c || opt_h)) 395 usage(); 396 397 if (opt_p) 398 debug("Will produce files in original not in current directory"); 399 400 if (opt_l) { 401 if (opt_l !~ /^[0-9]+$/ || opt_l < 1) 402 die("Invalid line width '" opt_l "'"); 403 line_width = opt_l; 404 debug("Line width set to " line_width); 405 } 406 407 for (i = 0; i < num_files; i++) 408 debug("Filename: " filenames[i]); 409 410 for (file_i = 0; file_i < num_files; file_i++) { 411 src = filenames[file_i]; 412 cfilename = hfilename = src; 413 sub(/\.m$/, ".c", cfilename); 414 sub(/\.m$/, ".h", hfilename); 415 if (!opt_p) { 416 sub(/^.*\//, "", cfilename); 417 sub(/^.*\//, "", hfilename); 418 } 419 420 debug("Processing from " src " to " cfilename " / " hfilename); 421 422 ctmpfilename = cfilename ".tmp"; 423 htmpfilename = hfilename ".tmp"; 424 425 # Avoid a literal generated file tag here. 426 generated = "@" "generated"; 427 428 common_head = \ 429 "/*\n" \ 430 " * This file is " generated " automatically.\n" \ 431 " * Do not modify anything in here by hand.\n" \ 432 " *\n" \ 433 " * Created from source file\n" \ 434 " * " src "\n" \ 435 " * with\n" \ 436 " * makeobjops.awk\n" \ 437 " *\n" \ 438 " * See the source file for legal information\n" \ 439 " */\n"; 440 441 printc(common_head "\n" \ 442 "#include <sys/param.h>\n" \ 443 "#include <sys/queue.h>\n" \ 444 "#include <sys/kernel.h>\n" \ 445 "#include <sys/kobj.h>"); 446 447 printh(common_head); 448 449 delete methods; # clear list of methods 450 intname = ""; 451 lineno = 0; 452 error = 0; # to signal clean up and gerror setting 453 lastdoc = ""; 454 prolog = ""; 455 epilog = ""; 456 457 while (!error && (getline < src) > 0) { 458 lineno++; 459 460 # 461 # Take special notice of include directives. 462 # 463 if (/^#[ ]*include[ ]+["<][^">]+[">]/) { 464 incld = $0; 465 sub(/^#[ ]*include[ ]+/, "", incld); 466 debug("Included file: " incld); 467 printc("#include " incld); 468 } 469 else if (/^#[ ]*if/ || /^#[ ]*else/ || /^#[ ]*elif/ || 470 /^#[ ]*endif/) { 471 printh($0); 472 printc($0); 473 } 474 475 sub(/#.*/, ""); # remove comments 476 sub(/^[ ]+/, ""); # remove leading ... 477 sub(/[ ]+$/, ""); # ... and trailing whitespace 478 479 if (/^$/) { # skip empty lines 480 } 481 else if (/^\/\*\*/) 482 lastdoc = handle_doc(); 483 else if (/^INTERFACE[ ]+[^ ;]*[ ]*;?[ ]*$/) { 484 printh(lastdoc); 485 lastdoc = ""; 486 handle_interface(); 487 } else if (/^CODE[ ]*{$/) 488 printc(handle_code()); 489 else if (/^HEADER[ ]*{$/) 490 printh(handle_code()); 491 else if (/^METHOD/) { 492 handle_method(0, lastdoc); 493 lastdoc = ""; 494 prolog = ""; 495 epilog = ""; 496 } else if (/^STATICMETHOD/) { 497 handle_method(1, lastdoc); 498 lastdoc = ""; 499 prolog = ""; 500 epilog = ""; 501 } else if (/^PROLOG[ ]*{$/) 502 prolog = handle_code(); 503 else if (/^EPILOG[ ]*{$/) 504 epilog = handle_code(); 505 else { 506 debug($0); 507 warnsrc("Invalid line encountered"); 508 error = 1; 509 } 510 } 511 512 # 513 # Print the final '#endif' in the header file. 514 # 515 printh("#endif /* _" intname "_if_h_ */"); 516 517 close (ctmpfilename); 518 close (htmpfilename); 519 520 if (error) { 521 warn("Output skipped"); 522 system_check("rm -f " ctmpfilename " " htmpfilename); 523 gerror = 1; 524 } 525 else { 526 if (opt_c) 527 system_check("mv -f " ctmpfilename " " cfilename); 528 if (opt_h) 529 system_check("mv -f " htmpfilename " " hfilename); 530 } 531 } 532 533 exit gerror; 534 535 }
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