pi.c revision 1.12
1 /* $NetBSD: pi.c,v 1.12 2006/04/09 19:21:26 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1980, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)pi.c 8.1 (Berkeley) 6/6/93"; 36 #endif 37 __RCSID("$NetBSD: pi.c,v 1.12 2006/04/09 19:21:26 christos Exp $"); 38 #endif /* not lint */ 39 40 #include <stdio.h> 41 #include <ctype.h> 42 #include <string.h> 43 #include <stdlib.h> 44 #include "error.h" 45 46 static char *c_linenumber; 47 static char *unk_hdr[] = {"In", "program", "???"}; 48 static char **c_header = &unk_hdr[0]; 49 50 boolean alldigits(char *); 51 boolean isdateformat(int, char **); 52 boolean instringset(char *, char **); 53 Errorclass pi(void); 54 boolean piptr(char *); 55 56 57 /* 58 * Attempt to handle error messages produced by pi (and by pc) 59 * 60 * problem #1: There is no file name available when a file does not 61 * use a #include; this will have to be given to error 62 * in the command line. 63 * problem #2: pi doesn't always tell you what line number 64 * a error refers to; for example during the tree 65 * walk phase of code generation and error detection, 66 * an error can refer to "variable foo in procedure bletch" 67 * without giving a line number 68 * problem #3: line numbers, when available, are attached to 69 * the source line, along with the source line itself 70 * These line numbers must be extracted, and 71 * the source line thrown away. 72 * problem #4: Some error messages produce more than one line number 73 * on the same message. 74 * There are only two (I think): 75 * %s undefined on line%s 76 * %s improperly used on line%s 77 * here, the %s makes line plural or singular. 78 * 79 * Here are the error strings used in pi version 1.2 that can refer 80 * to a file name or line number: 81 * 82 * Multiply defined label in case, lines %d and %d 83 * Goto %s from line %d is into a structured statement 84 * End matched %s on line %d 85 * Inserted keyword end matching %s on line %d 86 * 87 * Here are the general pi patterns recognized: 88 * define piptr == -.*^-.* 89 * define msg = .* 90 * define digit = [0-9] 91 * definename = .* 92 * define date_format letter*3 letter*3 (digit | (digit digit)) 93 * (digit | (digit digit)):digit*2 digit*4 94 * 95 * {e,E} (piptr) (msg) Encounter an error during textual scan 96 * E {digit}* - (msg) Have an error message that refers to a new line 97 * E - msg Have an error message that refers to current 98 * function, program or procedure 99 * (date_format) (name): When switch compilation files 100 * ... (msg) When refer to the previous line 101 * 'In' ('procedure'|'function'|'program') (name): 102 * pi is now complaining about 2nd pass errors. 103 * 104 * Here is the output from a compilation 105 * 106 * 107 * 2 var i:integer; 108 * e --------------^--- Inserted ';' 109 * E 2 - All variables must be declared in one var part 110 * E 5 - Include filename must end in .i 111 * Mon Apr 21 15:56 1980 test.h: 112 * 2 begin 113 * e ------^--- Inserted ';' 114 * Mon Apr 21 16:06 1980 test.p: 115 * E 2 - Function type must be specified 116 * 6 procedure foo(var x:real); 117 * e ------^--- Inserted ';' 118 * In function bletch: 119 * E - No assignment to the function variable 120 * w - variable x is never used 121 * E 6 - foo is already defined in this block 122 * In procedure foo: 123 * w - variable x is neither used nor set 124 * 9 z : = 23; 125 * E --------------^--- Undefined variable 126 * 10 y = [1]; 127 * e ----------------^--- Inserted ':' 128 * 13 z := 345.; 129 * e -----------------------^--- Digits required after decimal point 130 * E 10 - Constant set involved in non set context 131 * E 11 - Type clash: real is incompatible with integer 132 * ... Type of expression clashed with type of variable in assignment 133 * E 12 - Parameter type not identical to type of var parameter x of foo 134 * In program mung: 135 * w - variable y is never used 136 * w - type foo is never used 137 * w - function bletch is never used 138 * E - z undefined on lines 9 13 139 */ 140 char *Months[] = { 141 "Jan", "Feb", "Mar", "Apr", "May", "Jun", 142 "Jul", "Aug", "Sep", "Oct","Nov", "Dec", 143 0 144 }; 145 char *Days[] = { 146 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", 0 147 }; 148 char *Piroutines[] = { 149 "program", "function", "procedure", 0 150 }; 151 152 153 static boolean structured, multiple; 154 155 char *pi_Endmatched[] = {"End", "matched"}; 156 char *pi_Inserted[] = {"Inserted", "keyword", "end", "matching"}; 157 158 char *pi_multiple[] = {"Mutiply", "defined", "label", "in", "case,", "line"}; 159 char *pi_structured[] = {"is", "into", "a", "structured", "statement"}; 160 161 char *pi_und1[] = {"undefined", "on", "line"}; 162 char *pi_und2[] = {"undefined", "on", "lines"}; 163 char *pi_imp1[] = {"improperly", "used", "on", "line"}; 164 char *pi_imp2[] = {"improperly", "used", "on", "lines"}; 165 166 boolean 167 alldigits(char *string) 168 { 169 for (; *string && isdigit((unsigned char)*string); string++) 170 continue; 171 return(*string == '\0'); 172 } 173 174 boolean 175 instringset(char *member, char **set) 176 { 177 for(; *set; set++){ 178 if (strcmp(*set, member) == 0) 179 return(TRUE); 180 } 181 return(FALSE); 182 } 183 184 boolean 185 isdateformat(int wordc, char **wordv) 186 { 187 return( 188 (wordc == 5) 189 && (instringset(wordv[0], Days)) 190 && (instringset(wordv[1], Months)) 191 && (alldigits(wordv[2])) 192 && (alldigits(wordv[4])) ); 193 } 194 195 boolean 196 piptr(char *string) 197 { 198 if (*string != '-') 199 return(FALSE); 200 while (*string && *string == '-') 201 string++; 202 if (*string != '^') 203 return(FALSE); 204 string++; 205 while (*string && *string == '-') 206 string++; 207 return(*string == '\0'); 208 } 209 210 extern int wordc; 211 extern char **wordv; 212 213 Errorclass 214 pi(void) 215 { 216 char **nwordv; 217 218 nwordv = NULL; 219 if (wordc < 2) 220 return (C_UNKNOWN); 221 if ( ( strlen(wordv[1]) == 1) 222 && ( (wordv[1][0] == 'e') || (wordv[1][0] == 'E') ) 223 && ( piptr(wordv[2]) ) 224 ) { 225 boolean longpiptr = 0; 226 /* 227 * We have recognized a first pass error of the form: 228 * letter ------^---- message 229 * 230 * turn into an error message of the form: 231 * 232 * file line 'pascal errortype' letter \n |---- message 233 * or of the form: 234 * file line letter |---- message 235 * when there are strlen("(*[pi]") or more 236 * preceding '-' on the error pointer. 237 * 238 * Where the | is intended to be a down arrow, so that 239 * the pi error messages can be inserted above the 240 * line in error, instead of below. (All of the other 241 * languages put their messages before the source line, 242 * instead of after it as does pi.) 243 * 244 * where the pointer to the error has been truncated 245 * by 6 characters to account for the fact that 246 * the pointer points into a tab preceded input line. 247 */ 248 language = INPI; 249 (void)substitute(wordv[2], '^', '|'); 250 longpiptr = position(wordv[2],'|') > (6+8); 251 nwordv = wordvsplice(longpiptr ? 2 : 4, wordc, wordv+1); 252 nwordv[0] = strdup(currentfilename); 253 nwordv[1] = strdup(c_linenumber); 254 if (!longpiptr){ 255 nwordv[2] = "pascal errortype"; 256 nwordv[3] = wordv[1]; 257 nwordv[4] = strdup("%%%\n"); 258 if (strlen(nwordv[5]) > (8-2)) /* this is the pointer */ 259 nwordv[5] += (8-2); /* bump over 6 characters */ 260 } 261 wordv = nwordv - 1; /* convert to 1 based */ 262 wordc += longpiptr ? 2 : 4; 263 return(C_TRUE); 264 } 265 if ( (wordc >= 4) 266 && (strlen(wordv[1]) == 1) 267 && ( (*wordv[1] == 'E') || (*wordv[1] == 'w') || (*wordv[1] == 'e') ) 268 && (alldigits(wordv[2])) 269 && (strlen(wordv[3]) == 1) 270 && (wordv[3][0] == '-') 271 ){ 272 /* 273 * Message of the form: letter linenumber - message 274 * Turn into form: filename linenumber letter - message 275 */ 276 language = INPI; 277 nwordv = wordvsplice(1, wordc, wordv + 1); 278 nwordv[0] = strdup(currentfilename); 279 nwordv[1] = wordv[2]; 280 nwordv[2] = wordv[1]; 281 c_linenumber = wordv[2]; 282 wordc += 1; 283 wordv = nwordv - 1; 284 return(C_TRUE); 285 } 286 if ( (wordc >= 3) 287 && (strlen(wordv[1]) == 1) 288 && ( (*(wordv[1]) == 'E') || (*(wordv[1]) == 'w') || (*(wordv[1]) == 'e') ) 289 && (strlen(wordv[2]) == 1) 290 && (wordv[2][0] == '-') 291 ) { 292 /* 293 * Message of the form: letter - message 294 * This happens only when we are traversing the tree 295 * during the second pass of pi, and discover semantic 296 * errors. 297 * 298 * We have already (presumably) saved the header message 299 * and can now construct a nulled error message for the 300 * current file. 301 * 302 * Turns into a message of the form: 303 * filename (header) letter - message 304 * 305 * First, see if it is a message referring to more than 306 * one line number. Only of the form: 307 * %s undefined on line%s 308 * %s improperly used on line%s 309 */ 310 boolean undefined = 0; 311 int wordindex; 312 313 language = INPI; 314 if ( (undefined = (wordvcmp(wordv+2, 3, pi_und1) == 0) ) 315 || (undefined = (wordvcmp(wordv+2, 3, pi_und2) == 0) ) 316 || (wordvcmp(wordv+2, 4, pi_imp1) == 0) 317 || (wordvcmp(wordv+2, 4, pi_imp2) == 0) 318 ){ 319 for (wordindex = undefined ? 5 : 6; wordindex <= wordc; 320 wordindex++){ 321 if (nwordv) { 322 free(nwordv[0]); 323 free(nwordv); 324 } 325 nwordv = wordvsplice(2, undefined ? 2 : 3, wordv+1); 326 nwordv[0] = strdup(currentfilename); 327 nwordv[1] = wordv[wordindex]; 328 if (wordindex != wordc) 329 erroradd(undefined ? 4 : 5, nwordv, 330 C_TRUE, C_UNKNOWN); 331 } 332 wordc = undefined ? 4 : 5; 333 wordv = nwordv - 1; 334 return(C_TRUE); 335 } 336 337 nwordv = wordvsplice(1+3, wordc, wordv+1); 338 nwordv[0] = strdup(currentfilename); 339 nwordv[1] = strdup(c_header[0]); 340 nwordv[2] = strdup(c_header[1]); 341 nwordv[3] = strdup(c_header[2]); 342 wordv = nwordv - 1; 343 wordc += 1 + 3; 344 return(C_THISFILE); 345 } 346 if (strcmp(wordv[1], "...") == 0){ 347 /* 348 * have a continuation error message 349 * of the form: ... message 350 * Turn into form : filename linenumber message 351 */ 352 language = INPI; 353 nwordv = wordvsplice(1, wordc, wordv+1); 354 nwordv[0] = strdup(currentfilename); 355 nwordv[1] = strdup(c_linenumber); 356 wordv = nwordv - 1; 357 wordc += 1; 358 return(C_TRUE); 359 } 360 if( (wordc == 6) 361 && (lastchar(wordv[6]) == ':') 362 && (isdateformat(5, wordv + 1)) 363 ){ 364 /* 365 * Have message that tells us we have changed files 366 */ 367 language = INPI; 368 currentfilename = strdup(wordv[6]); 369 clob_last(currentfilename, '\0'); 370 return(C_SYNC); 371 } 372 if( (wordc == 3) 373 && (strcmp(wordv[1], "In") == 0) 374 && (lastchar(wordv[3]) == ':') 375 && (instringset(wordv[2], Piroutines)) 376 ) { 377 language = INPI; 378 c_header = wordvsplice(0, wordc, wordv+1); 379 return(C_SYNC); 380 } 381 /* 382 * now, check for just the line number followed by the text 383 */ 384 if (alldigits(wordv[1])){ 385 language = INPI; 386 c_linenumber = wordv[1]; 387 return(C_IGNORE); 388 } 389 /* 390 * Attempt to match messages refering to a line number 391 * 392 * Multiply defined label in case, lines %d and %d 393 * Goto %s from line %d is into a structured statement 394 * End matched %s on line %d 395 * Inserted keyword end matching %s on line %d 396 */ 397 multiple = structured = 0; 398 if ( 399 ( (wordc == 6) && (wordvcmp(wordv+1, 2, pi_Endmatched) == 0)) 400 || ( (wordc == 8) && (wordvcmp(wordv+1, 4, pi_Inserted) == 0)) 401 || ( multiple = ((wordc == 9) && (wordvcmp(wordv+1,6, pi_multiple) == 0) ) ) 402 || ( structured = ((wordc == 10) && (wordvcmp(wordv+6,5, pi_structured) == 0 ) )) 403 ){ 404 language = INPI; 405 nwordv = wordvsplice(2, wordc, wordv+1); 406 nwordv[0] = strdup(currentfilename); 407 nwordv[1] = structured ? wordv [5] : wordv[wordc]; 408 wordc += 2; 409 wordv = nwordv - 1; 410 if (!multiple) 411 return(C_TRUE); 412 erroradd(wordc, nwordv, C_TRUE, C_UNKNOWN); 413 nwordv = wordvsplice(0, wordc, nwordv); 414 nwordv[1] = wordv[wordc - 2]; 415 return(C_TRUE); 416 } 417 return(C_UNKNOWN); 418 } 419
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