1 /* 2 * Copyright (c) 1980 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char sccsid[] = "@(#)pi.c 5.4 (Berkeley) 06/01/90"; 10 #endif /* not lint */ 11 12 #include <stdio.h> 13 #include <ctype.h> 14 #include "error.h" 15 16 extern char *currentfilename; 17 static char *c_linenumber; 18 static char *unk_hdr[] = {"In", "program", "???"}; 19 static char **c_header = &unk_hdr[0]; 20 21 /* 22 * Attempt to handle error messages produced by pi (and by pc) 23 * 24 * problem #1: There is no file name available when a file does not 25 * use a #include; this will have to be given to error 26 * in the command line. 27 * problem #2: pi doesn't always tell you what line number 28 * a error refers to; for example during the tree 29 * walk phase of code generation and error detection, 30 * an error can refer to "variable foo in procedure bletch" 31 * without giving a line number 32 * problem #3: line numbers, when available, are attached to 33 * the source line, along with the source line itself 34 * These line numbers must be extracted, and 35 * the source line thrown away. 36 * problem #4: Some error messages produce more than one line number 37 * on the same message. 38 * There are only two (I think): 39 * %s undefined on line%s 40 * %s improperly used on line%s 41 * here, the %s makes line plural or singular. 42 * 43 * Here are the error strings used in pi version 1.2 that can refer 44 * to a file name or line number: 45 * 46 * Multiply defined label in case, lines %d and %d 47 * Goto %s from line %d is into a structured statement 48 * End matched %s on line %d 49 * Inserted keyword end matching %s on line %d 50 * 51 * Here are the general pi patterns recognized: 52 * define piptr == -.*^-.* 53 * define msg = .* 54 * define digit = [0-9] 55 * definename = .* 56 * define date_format letter*3 letter*3 (digit | (digit digit)) 57 * (digit | (digit digit)):digit*2 digit*4 58 * 59 * {e,E} (piptr) (msg) Encounter an error during textual scan 60 * E {digit}* - (msg) Have an error message that refers to a new line 61 * E - msg Have an error message that refers to current 62 * function, program or procedure 63 * (date_format) (name): When switch compilation files 64 * ... (msg) When refer to the previous line 65 * 'In' ('procedure'|'function'|'program') (name): 66 * pi is now complaining about 2nd pass errors. 67 * 68 * Here is the output from a compilation 69 * 70 * 71 * 2 var i:integer; 72 * e --------------^--- Inserted ';' 73 * E 2 - All variables must be declared in one var part 74 * E 5 - Include filename must end in .i 75 * Mon Apr 21 15:56 1980 test.h: 76 * 2 begin 77 * e ------^--- Inserted ';' 78 * Mon Apr 21 16:06 1980 test.p: 79 * E 2 - Function type must be specified 80 * 6 procedure foo(var x:real); 81 * e ------^--- Inserted ';' 82 * In function bletch: 83 * E - No assignment to the function variable 84 * w - variable x is never used 85 * E 6 - foo is already defined in this block 86 * In procedure foo: 87 * w - variable x is neither used nor set 88 * 9 z : = 23; 89 * E --------------^--- Undefined variable 90 * 10 y = [1]; 91 * e ----------------^--- Inserted ':' 92 * 13 z := 345.; 93 * e -----------------------^--- Digits required after decimal point 94 * E 10 - Constant set involved in non set context 95 * E 11 - Type clash: real is incompatible with integer 96 * ... Type of expression clashed with type of variable in assignment 97 * E 12 - Parameter type not identical to type of var parameter x of foo 98 * In program mung: 99 * w - variable y is never used 100 * w - type foo is never used 101 * w - function bletch is never used 102 * E - z undefined on lines 9 13 103 */ 104 char *Months[] = { 105 "Jan", "Feb", "Mar", "Apr", "May", "Jun", 106 "Jul", "Aug", "Sep", "Oct","Nov", "Dec", 107 0 108 }; 109 char *Days[] = { 110 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", 0 111 }; 112 char *Piroutines[] = { 113 "program", "function", "procedure", 0 114 }; 115 116 117 static boolean structured, multiple; 118 119 char *pi_Endmatched[] = {"End", "matched"}; 120 char *pi_Inserted[] = {"Inserted", "keyword", "end", "matching"}; 121 122 char *pi_multiple[] = {"Mutiply", "defined", "label", "in", "case,", "line"}; 123 char *pi_structured[] = {"is", "into", "a", "structured", "statement"}; 124 125 char *pi_und1[] = {"undefined", "on", "line"}; 126 char *pi_und2[] = {"undefined", "on", "lines"}; 127 char *pi_imp1[] = {"improperly", "used", "on", "line"}; 128 char *pi_imp2[] = {"improperly", "used", "on", "lines"}; 129 130 boolean alldigits(string) 131 reg char *string; 132 { 133 for (; *string && isdigit(*string); string++) 134 continue; 135 return(*string == '\0'); 136 } 137 boolean instringset(member, set) 138 char *member; 139 reg char **set; 140 { 141 for(; *set; set++){ 142 if (strcmp(*set, member) == 0) 143 return(TRUE); 144 } 145 return(FALSE); 146 } 147 148 boolean isdateformat(wordc, wordv) 149 int wordc; 150 char **wordv; 151 { 152 return( 153 (wordc == 5) 154 && (instringset(wordv[0], Days)) 155 && (instringset(wordv[1], Months)) 156 && (alldigits(wordv[2])) 157 && (alldigits(wordv[4])) ); 158 } 159 160 boolean piptr(string) 161 reg char *string; 162 { 163 if (*string != '-') 164 return(FALSE); 165 while (*string && *string == '-') 166 string++; 167 if (*string != '^') 168 return(FALSE); 169 string++; 170 while (*string && *string == '-') 171 string++; 172 return(*string == '\0'); 173 } 174 175 extern int wordc; 176 extern char **wordv; 177 178 Errorclass pi() 179 { 180 char **nwordv; 181 182 if (wordc < 2) 183 return (C_UNKNOWN); 184 if ( ( strlen(wordv[1]) == 1) 185 && ( (wordv[1][0] == 'e') || (wordv[1][0] == 'E') ) 186 && ( piptr(wordv[2]) ) 187 ) { 188 boolean longpiptr = 0; 189 /* 190 * We have recognized a first pass error of the form: 191 * letter ------^---- message 192 * 193 * turn into an error message of the form: 194 * 195 * file line 'pascal errortype' letter \n |---- message 196 * or of the form: 197 * file line letter |---- message 198 * when there are strlen("(*[pi]") or more 199 * preceding '-' on the error pointer. 200 * 201 * Where the | is intended to be a down arrow, so that 202 * the pi error messages can be inserted above the 203 * line in error, instead of below. (All of the other 204 * langauges put thier messages before the source line, 205 * instead of after it as does pi.) 206 * 207 * where the pointer to the error has been truncated 208 * by 6 characters to account for the fact that 209 * the pointer points into a tab preceded input line. 210 */ 211 language = INPI; 212 (void)substitute(wordv[2], '^', '|'); 213 longpiptr = position(wordv[2],'|') > (6+8); 214 nwordv = wordvsplice(longpiptr ? 2 : 4, wordc, wordv+1); 215 nwordv[0] = strsave(currentfilename); 216 nwordv[1] = strsave(c_linenumber); 217 if (!longpiptr){ 218 nwordv[2] = "pascal errortype"; 219 nwordv[3] = wordv[1]; 220 nwordv[4] = strsave("%%%\n"); 221 if (strlen(nwordv[5]) > (8-2)) /* this is the pointer */ 222 nwordv[5] += (8-2); /* bump over 6 characters */ 223 } 224 wordv = nwordv - 1; /* convert to 1 based */ 225 wordc += longpiptr ? 2 : 4; 226 return(C_TRUE); 227 } 228 if ( (wordc >= 4) 229 && (strlen(wordv[1]) == 1) 230 && ( (*wordv[1] == 'E') || (*wordv[1] == 'w') || (*wordv[1] == 'e') ) 231 && (alldigits(wordv[2])) 232 && (strlen(wordv[3]) == 1) 233 && (wordv[3][0] == '-') 234 ){ 235 /* 236 * Message of the form: letter linenumber - message 237 * Turn into form: filename linenumber letter - message 238 */ 239 language = INPI; 240 nwordv = wordvsplice(1, wordc, wordv + 1); 241 nwordv[0] = strsave(currentfilename); 242 nwordv[1] = wordv[2]; 243 nwordv[2] = wordv[1]; 244 c_linenumber = wordv[2]; 245 wordc += 1; 246 wordv = nwordv - 1; 247 return(C_TRUE); 248 } 249 if ( (wordc >= 3) 250 && (strlen(wordv[1]) == 1) 251 && ( (*(wordv[1]) == 'E') || (*(wordv[1]) == 'w') || (*(wordv[1]) == 'e') ) 252 && (strlen(wordv[2]) == 1) 253 && (wordv[2][0] == '-') 254 ) { 255 /* 256 * Message of the form: letter - message 257 * This happens only when we are traversing the tree 258 * during the second pass of pi, and discover semantic 259 * errors. 260 * 261 * We have already (presumably) saved the header message 262 * and can now construct a nulled error message for the 263 * current file. 264 * 265 * Turns into a message of the form: 266 * filename (header) letter - message 267 * 268 * First, see if it is a message referring to more than 269 * one line number. Only of the form: 270 * %s undefined on line%s 271 * %s improperly used on line%s 272 */ 273 boolean undefined = 0; 274 int wordindex; 275 276 language = INPI; 277 if ( (undefined = (wordvcmp(wordv+2, 3, pi_und1) == 0) ) 278 || (undefined = (wordvcmp(wordv+2, 3, pi_und2) == 0) ) 279 || (wordvcmp(wordv+2, 4, pi_imp1) == 0) 280 || (wordvcmp(wordv+2, 4, pi_imp2) == 0) 281 ){ 282 for (wordindex = undefined ? 5 : 6; wordindex <= wordc; 283 wordindex++){ 284 nwordv = wordvsplice(2, undefined ? 2 : 3, wordv+1); 285 nwordv[0] = strsave(currentfilename); 286 nwordv[1] = wordv[wordindex]; 287 if (wordindex != wordc) 288 erroradd(undefined ? 4 : 5, nwordv, 289 C_TRUE, C_UNKNOWN); 290 } 291 wordc = undefined ? 4 : 5; 292 wordv = nwordv - 1; 293 return(C_TRUE); 294 } 295 296 nwordv = wordvsplice(1+3, wordc, wordv+1); 297 nwordv[0] = strsave(currentfilename); 298 nwordv[1] = strsave(c_header[0]); 299 nwordv[2] = strsave(c_header[1]); 300 nwordv[3] = strsave(c_header[2]); 301 wordv = nwordv - 1; 302 wordc += 1 + 3; 303 return(C_THISFILE); 304 } 305 if (strcmp(wordv[1], "...") == 0){ 306 /* 307 * have a continuation error message 308 * of the form: ... message 309 * Turn into form : filename linenumber message 310 */ 311 language = INPI; 312 nwordv = wordvsplice(1, wordc, wordv+1); 313 nwordv[0] = strsave(currentfilename); 314 nwordv[1] = strsave(c_linenumber); 315 wordv = nwordv - 1; 316 wordc += 1; 317 return(C_TRUE); 318 } 319 if( (wordc == 6) 320 && (lastchar(wordv[6]) == ':') 321 && (isdateformat(5, wordv + 1)) 322 ){ 323 /* 324 * Have message that tells us we have changed files 325 */ 326 language = INPI; 327 currentfilename = strsave(wordv[6]); 328 clob_last(currentfilename, '\0'); 329 return(C_SYNC); 330 } 331 if( (wordc == 3) 332 && (strcmp(wordv[1], "In") == 0) 333 && (lastchar(wordv[3]) == ':') 334 && (instringset(wordv[2], Piroutines)) 335 ) { 336 language = INPI; 337 c_header = wordvsplice(0, wordc, wordv+1); 338 return(C_SYNC); 339 } 340 /* 341 * now, check for just the line number followed by the text 342 */ 343 if (alldigits(wordv[1])){ 344 language = INPI; 345 c_linenumber = wordv[1]; 346 return(C_IGNORE); 347 } 348 /* 349 * Attempt to match messages refering to a line number 350 * 351 * Multiply defined label in case, lines %d and %d 352 * Goto %s from line %d is into a structured statement 353 * End matched %s on line %d 354 * Inserted keyword end matching %s on line %d 355 */ 356 multiple = structured = 0; 357 if ( 358 ( (wordc == 6) && (wordvcmp(wordv+1, 2, pi_Endmatched) == 0)) 359 || ( (wordc == 8) && (wordvcmp(wordv+1, 4, pi_Inserted) == 0)) 360 || ( multiple = ((wordc == 9) && (wordvcmp(wordv+1,6, pi_multiple) == 0) ) ) 361 || ( structured = ((wordc == 10) && (wordvcmp(wordv+6,5, pi_structured) == 0 ) )) 362 ){ 363 language = INPI; 364 nwordv = wordvsplice(2, wordc, wordv+1); 365 nwordv[0] = strsave(currentfilename); 366 nwordv[1] = structured ? wordv [5] : wordv[wordc]; 367 wordc += 2; 368 wordv = nwordv - 1; 369 if (!multiple) 370 return(C_TRUE); 371 erroradd(wordc, nwordv, C_TRUE, C_UNKNOWN); 372 nwordv = wordvsplice(0, wordc, nwordv); 373 nwordv[1] = wordv[wordc - 2]; 374 return(C_TRUE); 375 } 376 return(C_UNKNOWN); 377 } 378