1 /* 2 * Copyright (c) 1980 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that this notice is preserved and that due credit is given 7 * to the University of California at Berkeley. The name of the University 8 * may not be used to endorse or promote products derived from this 9 * software without specific prior written permission. This software 10 * is provided ``as is'' without express or implied warranty. 11 */ 12 13 #ifndef lint 14 static char sccsid[] = "@(#)pi.c 5.2 (Berkeley) 06/06/88"; 15 #endif /* not lint */ 16 17 #include <stdio.h> 18 #include <ctype.h> 19 #include "error.h" 20 21 extern char *currentfilename; 22 static char *c_linenumber; 23 static char *unk_hdr[] = {"In", "program", "???"}; 24 static char **c_header = &unk_hdr[0]; 25 26 /* 27 * Attempt to handle error messages produced by pi (and by pc) 28 * 29 * problem #1: There is no file name available when a file does not 30 * use a #include; this will have to be given to error 31 * in the command line. 32 * problem #2: pi doesn't always tell you what line number 33 * a error refers to; for example during the tree 34 * walk phase of code generation and error detection, 35 * an error can refer to "variable foo in procedure bletch" 36 * without giving a line number 37 * problem #3: line numbers, when available, are attached to 38 * the source line, along with the source line itself 39 * These line numbers must be extracted, and 40 * the source line thrown away. 41 * problem #4: Some error messages produce more than one line number 42 * on the same message. 43 * There are only two (I think): 44 * %s undefined on line%s 45 * %s improperly used on line%s 46 * here, the %s makes line plural or singular. 47 * 48 * Here are the error strings used in pi version 1.2 that can refer 49 * to a file name or line number: 50 * 51 * Multiply defined label in case, lines %d and %d 52 * Goto %s from line %d is into a structured statement 53 * End matched %s on line %d 54 * Inserted keyword end matching %s on line %d 55 * 56 * Here are the general pi patterns recognized: 57 * define piptr == -.*^-.* 58 * define msg = .* 59 * define digit = [0-9] 60 * definename = .* 61 * define date_format letter*3 letter*3 (digit | (digit digit)) 62 * (digit | (digit digit)):digit*2 digit*4 63 * 64 * {e,E} (piptr) (msg) Encounter an error during textual scan 65 * E {digit}* - (msg) Have an error message that refers to a new line 66 * E - msg Have an error message that refers to current 67 * function, program or procedure 68 * (date_format) (name): When switch compilation files 69 * ... (msg) When refer to the previous line 70 * 'In' ('procedure'|'function'|'program') (name): 71 * pi is now complaining about 2nd pass errors. 72 * 73 * Here is the output from a compilation 74 * 75 * 76 * 2 var i:integer; 77 * e --------------^--- Inserted ';' 78 * E 2 - All variables must be declared in one var part 79 * E 5 - Include filename must end in .i 80 * Mon Apr 21 15:56 1980 test.h: 81 * 2 begin 82 * e ------^--- Inserted ';' 83 * Mon Apr 21 16:06 1980 test.p: 84 * E 2 - Function type must be specified 85 * 6 procedure foo(var x:real); 86 * e ------^--- Inserted ';' 87 * In function bletch: 88 * E - No assignment to the function variable 89 * w - variable x is never used 90 * E 6 - foo is already defined in this block 91 * In procedure foo: 92 * w - variable x is neither used nor set 93 * 9 z : = 23; 94 * E --------------^--- Undefined variable 95 * 10 y = [1]; 96 * e ----------------^--- Inserted ':' 97 * 13 z := 345.; 98 * e -----------------------^--- Digits required after decimal point 99 * E 10 - Constant set involved in non set context 100 * E 11 - Type clash: real is incompatible with integer 101 * ... Type of expression clashed with type of variable in assignment 102 * E 12 - Parameter type not identical to type of var parameter x of foo 103 * In program mung: 104 * w - variable y is never used 105 * w - type foo is never used 106 * w - function bletch is never used 107 * E - z undefined on lines 9 13 108 */ 109 char *Months[] = { 110 "Jan", "Feb", "Mar", "Apr", "May", "Jun", 111 "Jul", "Aug", "Sep", "Oct","Nov", "Dec", 112 0 113 }; 114 char *Days[] = { 115 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", 0 116 }; 117 char *Piroutines[] = { 118 "program", "function", "procedure", 0 119 }; 120 121 122 static boolean structured, multiple; 123 124 char *pi_Endmatched[] = {"End", "matched"}; 125 char *pi_Inserted[] = {"Inserted", "keyword", "end", "matching"}; 126 127 char *pi_multiple[] = {"Mutiply", "defined", "label", "in", "case,", "line"}; 128 char *pi_structured[] = {"is", "into", "a", "structured", "statement"}; 129 130 char *pi_und1[] = {"undefined", "on", "line"}; 131 char *pi_und2[] = {"undefined", "on", "lines"}; 132 char *pi_imp1[] = {"improperly", "used", "on", "line"}; 133 char *pi_imp2[] = {"improperly", "used", "on", "lines"}; 134 135 boolean alldigits(string) 136 reg char *string; 137 { 138 for (; *string && isdigit(*string); string++) 139 continue; 140 return(*string == '\0'); 141 } 142 boolean instringset(member, set) 143 char *member; 144 reg char **set; 145 { 146 for(; *set; set++){ 147 if (strcmp(*set, member) == 0) 148 return(TRUE); 149 } 150 return(FALSE); 151 } 152 153 boolean isdateformat(wordc, wordv) 154 int wordc; 155 char **wordv; 156 { 157 return( 158 (wordc == 5) 159 && (instringset(wordv[0], Days)) 160 && (instringset(wordv[1], Months)) 161 && (alldigits(wordv[2])) 162 && (alldigits(wordv[4])) ); 163 } 164 165 boolean piptr(string) 166 reg char *string; 167 { 168 if (*string != '-') 169 return(FALSE); 170 while (*string && *string == '-') 171 string++; 172 if (*string != '^') 173 return(FALSE); 174 string++; 175 while (*string && *string == '-') 176 string++; 177 return(*string == '\0'); 178 } 179 180 extern int wordc; 181 extern char **wordv; 182 183 Errorclass pi() 184 { 185 char **nwordv; 186 187 if (wordc < 2) 188 return (C_UNKNOWN); 189 if ( ( strlen(wordv[1]) == 1) 190 && ( (wordv[1][0] == 'e') || (wordv[1][0] == 'E') ) 191 && ( piptr(wordv[2]) ) 192 ) { 193 boolean longpiptr = 0; 194 /* 195 * We have recognized a first pass error of the form: 196 * letter ------^---- message 197 * 198 * turn into an error message of the form: 199 * 200 * file line 'pascal errortype' letter \n |---- message 201 * or of the form: 202 * file line letter |---- message 203 * when there are strlen("(*[pi]") or more 204 * preceding '-' on the error pointer. 205 * 206 * Where the | is intended to be a down arrow, so that 207 * the pi error messages can be inserted above the 208 * line in error, instead of below. (All of the other 209 * langauges put thier messages before the source line, 210 * instead of after it as does pi.) 211 * 212 * where the pointer to the error has been truncated 213 * by 6 characters to account for the fact that 214 * the pointer points into a tab preceded input line. 215 */ 216 language = INPI; 217 (void)substitute(wordv[2], '^', '|'); 218 longpiptr = position(wordv[2],'|') > (6+8); 219 nwordv = wordvsplice(longpiptr ? 2 : 4, wordc, wordv+1); 220 nwordv[0] = strsave(currentfilename); 221 nwordv[1] = strsave(c_linenumber); 222 if (!longpiptr){ 223 nwordv[2] = "pascal errortype"; 224 nwordv[3] = wordv[1]; 225 nwordv[4] = strsave("%%%\n"); 226 if (strlen(nwordv[5]) > (8-2)) /* this is the pointer */ 227 nwordv[5] += (8-2); /* bump over 6 characters */ 228 } 229 wordv = nwordv - 1; /* convert to 1 based */ 230 wordc += longpiptr ? 2 : 4; 231 return(C_TRUE); 232 } 233 if ( (wordc >= 4) 234 && (strlen(wordv[1]) == 1) 235 && ( (*wordv[1] == 'E') || (*wordv[1] == 'w') || (*wordv[1] == 'e') ) 236 && (alldigits(wordv[2])) 237 && (strlen(wordv[3]) == 1) 238 && (wordv[3][0] == '-') 239 ){ 240 /* 241 * Message of the form: letter linenumber - message 242 * Turn into form: filename linenumber letter - message 243 */ 244 language = INPI; 245 nwordv = wordvsplice(1, wordc, wordv + 1); 246 nwordv[0] = strsave(currentfilename); 247 nwordv[1] = wordv[2]; 248 nwordv[2] = wordv[1]; 249 c_linenumber = wordv[2]; 250 wordc += 1; 251 wordv = nwordv - 1; 252 return(C_TRUE); 253 } 254 if ( (wordc >= 3) 255 && (strlen(wordv[1]) == 1) 256 && ( (*(wordv[1]) == 'E') || (*(wordv[1]) == 'w') || (*(wordv[1]) == 'e') ) 257 && (strlen(wordv[2]) == 1) 258 && (wordv[2][0] == '-') 259 ) { 260 /* 261 * Message of the form: letter - message 262 * This happens only when we are traversing the tree 263 * during the second pass of pi, and discover semantic 264 * errors. 265 * 266 * We have already (presumably) saved the header message 267 * and can now construct a nulled error message for the 268 * current file. 269 * 270 * Turns into a message of the form: 271 * filename (header) letter - message 272 * 273 * First, see if it is a message referring to more than 274 * one line number. Only of the form: 275 * %s undefined on line%s 276 * %s improperly used on line%s 277 */ 278 boolean undefined = 0; 279 int wordindex; 280 281 language = INPI; 282 if ( (undefined = (wordvcmp(wordv+2, 3, pi_und1) == 0) ) 283 || (undefined = (wordvcmp(wordv+2, 3, pi_und2) == 0) ) 284 || (wordvcmp(wordv+2, 4, pi_imp1) == 0) 285 || (wordvcmp(wordv+2, 4, pi_imp2) == 0) 286 ){ 287 for (wordindex = undefined ? 5 : 6; wordindex <= wordc; 288 wordindex++){ 289 nwordv = wordvsplice(2, undefined ? 2 : 3, wordv+1); 290 nwordv[0] = strsave(currentfilename); 291 nwordv[1] = wordv[wordindex]; 292 if (wordindex != wordc) 293 erroradd(undefined ? 4 : 5, nwordv, 294 C_TRUE, C_UNKNOWN); 295 } 296 wordc = undefined ? 4 : 5; 297 wordv = nwordv - 1; 298 return(C_TRUE); 299 } 300 301 nwordv = wordvsplice(1+3, wordc, wordv+1); 302 nwordv[0] = strsave(currentfilename); 303 nwordv[1] = strsave(c_header[0]); 304 nwordv[2] = strsave(c_header[1]); 305 nwordv[3] = strsave(c_header[2]); 306 wordv = nwordv - 1; 307 wordc += 1 + 3; 308 return(C_THISFILE); 309 } 310 if (strcmp(wordv[1], "...") == 0){ 311 /* 312 * have a continuation error message 313 * of the form: ... message 314 * Turn into form : filename linenumber message 315 */ 316 language = INPI; 317 nwordv = wordvsplice(1, wordc, wordv+1); 318 nwordv[0] = strsave(currentfilename); 319 nwordv[1] = strsave(c_linenumber); 320 wordv = nwordv - 1; 321 wordc += 1; 322 return(C_TRUE); 323 } 324 if( (wordc == 6) 325 && (lastchar(wordv[6]) == ':') 326 && (isdateformat(5, wordv + 1)) 327 ){ 328 /* 329 * Have message that tells us we have changed files 330 */ 331 language = INPI; 332 currentfilename = strsave(wordv[6]); 333 clob_last(currentfilename, '\0'); 334 return(C_SYNC); 335 } 336 if( (wordc == 3) 337 && (strcmp(wordv[1], "In") == 0) 338 && (lastchar(wordv[3]) == ':') 339 && (instringset(wordv[2], Piroutines)) 340 ) { 341 language = INPI; 342 c_header = wordvsplice(0, wordc, wordv+1); 343 return(C_SYNC); 344 } 345 /* 346 * now, check for just the line number followed by the text 347 */ 348 if (alldigits(wordv[1])){ 349 language = INPI; 350 c_linenumber = wordv[1]; 351 return(C_IGNORE); 352 } 353 /* 354 * Attempt to match messages refering to a line number 355 * 356 * Multiply defined label in case, lines %d and %d 357 * Goto %s from line %d is into a structured statement 358 * End matched %s on line %d 359 * Inserted keyword end matching %s on line %d 360 */ 361 multiple = structured = 0; 362 if ( 363 ( (wordc == 6) && (wordvcmp(wordv+1, 2, pi_Endmatched) == 0)) 364 || ( (wordc == 8) && (wordvcmp(wordv+1, 4, pi_Inserted) == 0)) 365 || ( multiple = ((wordc == 9) && (wordvcmp(wordv+1,6, pi_multiple) == 0) ) ) 366 || ( structured = ((wordc == 10) && (wordvcmp(wordv+6,5, pi_structured) == 0 ) )) 367 ){ 368 language = INPI; 369 nwordv = wordvsplice(2, wordc, wordv+1); 370 nwordv[0] = strsave(currentfilename); 371 nwordv[1] = structured ? wordv [5] : wordv[wordc]; 372 wordc += 2; 373 wordv = nwordv - 1; 374 if (!multiple) 375 return(C_TRUE); 376 erroradd(wordc, nwordv, C_TRUE, C_UNKNOWN); 377 nwordv = wordvsplice(0, wordc, nwordv); 378 nwordv[1] = wordv[wordc - 2]; 379 return(C_TRUE); 380 } 381 return(C_UNKNOWN); 382 } 383