1: # 2: /* 3: * 4: * UNIX debugger 5: * 6: */ 7: 8: #include "defs.h" 9: 10: 11: MSG BADSYM; 12: MSG BADVAR; 13: MSG BADKET; 14: MSG BADSYN; 15: MSG NOCFN; 16: MSG NOADR; 17: MSG BADLOC; 18: 19: SYMTAB symbol; 20: INT lastframe; 21: INT kernel; 22: INT savlastf; 23: L_INT savframe; 24: OVTAG svlastov; 25: INT savpc; 26: INT callpc; 27: 28: 29: 30: CHAR *lp; 31: INT octal; 32: STRING errflg; 33: L_INT localval; 34: CHAR isymbol[8]; 35: 36: CHAR lastc; 37: POS *uar0; 38: POS *corhdr; 39: OVTAG curov, startov; 40: OVTAG lastsymov; 41: int overlay; 42: 43: L_INT dot; 44: L_INT ditto; 45: INT dotinc; 46: L_INT var[]; 47: L_INT expv; 48: 49: 50: 51: 52: expr(a) 53: { /* term | term dyadic expr | */ 54: INT rc; 55: L_INT lhs; 56: 57: lastsymov = 0; 58: rdc(); lp--; rc=term(a); 59: 60: WHILE rc 61: DO lhs = expv; 62: 63: switch (readchar()) { 64: 65: case '+': 66: term(a|1); expv += lhs; break; 67: 68: case '-': 69: term(a|1); expv = lhs - expv; break; 70: 71: case '#': 72: term(a|1); expv = round(lhs,expv); break; 73: 74: case '*': 75: term(a|1); expv *= lhs; break; 76: 77: case '%': 78: term(a|1); expv = lhs/expv; break; 79: 80: case '&': 81: term(a|1); expv &= lhs; break; 82: 83: case '|': 84: term(a|1); expv |= lhs; break; 85: 86: case ')': 87: IF (a&2)==0 THEN error(BADKET); FI 88: 89: default: 90: lp--; 91: return(rc); 92: } 93: OD 94: return(rc); 95: } 96: 97: term(a) 98: { /* item | monadic item | (expr) | */ 99: 100: switch (readchar()) { 101: 102: case '*': 103: term(a|1); expv=chkget(expv,DSP); return(1); 104: 105: case '@': 106: term(a|1); expv=chkget(expv,ISP); return(1); 107: 108: case '-': 109: term(a|1); expv = -expv; return(1); 110: 111: case '~': 112: term(a|1); expv = ~expv; return(1); 113: 114: case '(': 115: expr(2); 116: IF *lp!=')' 117: THEN error(BADSYN); 118: ELSE lp++; return(1); 119: FI 120: 121: default: 122: lp--; 123: return(item(a)); 124: } 125: } 126: 127: item(a) 128: { /* name [ . local ] | number | . | ^ | <var | <register | 'x | | */ 129: INT base, d, frpt, regptr; 130: CHAR savc; 131: BOOL hex; 132: L_INT frame; 133: UNION{REAL r; L_INT i;} real; 134: SYMPTR symp; 135: OVTAG savov; 136: 137: hex=FALSE; 138: 139: readchar(); 140: IF symchar(0) 141: THEN readsym(); 142: IF lastc=='.' 143: THEN frame=(kernel?corhdr[KR5]:uar0[R5])&EVEN; 144: lastframe=0; callpc=kernel?(-2):uar0[PC]; 145: if (overlay){ 146: savov = curov; 147: setovmap(startov); 148: } 149: WHILE errflg==0 150: DO savpc=callpc; 151: findroutine(frame); 152: IF eqsym(symbol.symc,isymbol,'~') 153: THEN break; 154: FI 155: lastframe=frame; 156: frame=get(frame,DSP)&EVEN; 157: IF frame==0 158: THEN error(NOCFN); 159: FI 160: OD 161: savlastf=lastframe; savframe=frame; 162: svlastov = curov; 163: readchar(); 164: IF symchar(0) 165: THEN chkloc(expv=frame); 166: FI 167: if (overlay) 168: setovmap(savov); 169: ELIF (symp=lookupsym(isymbol))==0 THEN error(BADSYM); 170: ELSE expv = symp->symv; lastsymov=symp->ovnumb; 171: FI 172: lp--; 173: 174: 175: ELIF digit(lastc) ORF (hex=TRUE, lastc=='#' ANDF hexdigit(readchar())) 176: THEN expv = 0; 177: base = (lastc == '0' ORF octal ? 8 : (hex ? 16 : 10)); 178: WHILE (hex ? hexdigit(lastc) : digit(lastc)) 179: DO expv *= base; 180: IF (d=convdig(lastc))>=base THEN error(BADSYN); FI 181: expv += d; readchar(); 182: IF expv==0 ANDF (lastc=='x' ORF lastc=='X') 183: THEN hex=TRUE; base=16; readchar(); 184: FI 185: OD 186: IF lastc=='.' ANDF (base==10 ORF expv==0) ANDF !hex 187: THEN real.r=expv; frpt=0; base=10; 188: WHILE digit(readchar()) 189: DO real.r *= base; frpt++; 190: real.r += lastc-'0'; 191: OD 192: WHILE frpt-- 193: DO real.r /= base; OD 194: expv = real.i; 195: FI 196: lp--; 197: 198: ELIF lastc=='.' 199: THEN readchar(); 200: IF symchar(0) 201: THEN savov = curov; 202: curov = svlastov; 203: lastframe=savlastf; callpc=savpc; findroutine(savframe); 204: chkloc(savframe); 205: if(overlay) 206: setovmap(savov); 207: ELSE expv=dot; 208: FI 209: lp--; 210: 211: ELIF lastc=='"' 212: THEN expv=ditto; 213: 214: ELIF lastc=='+' 215: THEN expv=inkdot(dotinc); 216: 217: ELIF lastc=='^' 218: THEN expv=inkdot(-dotinc); 219: 220: ELIF lastc=='<' 221: THEN savc=rdc(); 222: IF (regptr=getreg(savc)) != NOREG 223: THEN expv=uar0[regptr]; 224: ELIF (base=varchk(savc)) != -1 225: THEN expv=var[base]; 226: ELSE error(BADVAR); 227: FI 228: 229: ELIF lastc=='\'' 230: THEN d=4; expv=0; 231: WHILE quotchar() 232: DO IF d-- 233: THEN IF d==1 THEN expv =<<16; FI 234: expv |= ((d&1)?lastc:lastc<<8); 235: ELSE error(BADSYN); 236: FI 237: OD 238: 239: ELIF a 240: THEN error(NOADR); 241: ELSE lp--; return(0); 242: FI 243: return(1); 244: } 245: 246: /* service routines for expression reading */ 247: 248: readsym() 249: { 250: REG char *p; 251: 252: p = isymbol; 253: REP IF p < &isymbol[8] 254: THEN *p++ = lastc; 255: FI 256: readchar(); 257: PER symchar(1) DONE 258: WHILE p < &isymbol[8] DO *p++ = 0; OD 259: } 260: 261: SYMPTR lookupsym(symstr) 262: STRING symstr; 263: { 264: SYMPTR symp; 265: symset(); 266: WHILE (symp=symget()) 267: DO IF (symp->symf&SYMCHK)==symp->symf 268: THEN IF overlay ANDF (symp->symf&SYMCHK)==ISYM ANDF 269: eqsym(symp->symc, symstr,'~') 270: THEN return(symp); 271: ELIF eqsym(symp->symc, symstr,'_') 272: THEN return(symp); 273: FI 274: FI 275: OD 276: return(0); 277: } 278: 279: hexdigit(c) 280: CHAR c; 281: { return((c>='0' ANDF c<='9') ORF (c>='a' ANDF c<='f')); 282: } 283: 284: convdig(c) 285: CHAR c; 286: { 287: IF digit(c) 288: THEN return(c-'0'); 289: ELIF hexdigit(c) 290: THEN return(c-'a'+10); 291: ELSE return(17); 292: FI 293: } 294: 295: digit(c) char c; {return(c>='0' ANDF c<='9');} 296: 297: letter(c) char c; {return(c>='a' ANDF c<='z' ORF c>='A' ANDF c<='Z');} 298: 299: symchar(dig) 300: { 301: IF lastc=='\\' THEN readchar(); return(TRUE); FI 302: return( letter(lastc) ORF lastc=='_' ORF dig ANDF digit(lastc) ); 303: } 304: 305: varchk(name) 306: { 307: IF digit(name) THEN return(name-'0'); FI 308: IF letter(name) THEN return((name&037)-1+10); FI 309: return(-1); 310: } 311: 312: chkloc(frame) 313: L_INT frame; 314: { 315: readsym(); 316: REP IF localsym(frame)==0 THEN error(BADLOC); FI 317: expv=localval; 318: PER !eqsym(symbol.symc,isymbol,'~') DONE 319: } 320: 321: eqsym(s1, s2, c) 322: REG STRING s1, s2; 323: CHAR c; 324: { 325: IF eqstr(s1,s2) 326: THEN return(TRUE); 327: ELIF *s1==c 328: THEN CHAR s3[8]; 329: REG INT i; 330: 331: s3[0]=c; 332: FOR i=1; i<8; i++ 333: DO s3[i] = *s2++; OD 334: 335: return(eqstr(s1,s3)); 336: FI 337: }
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