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