projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| a1dada70 SL |
1 | #ifndef lint |
| 2 | static char sccsid[] = "@(#)expr.c 4.8 %G%"; | |
| 3 | #endif | |
| 51a6db3a BJ |
4 | /* |
| 5 | * | |
| 6 | * UNIX debugger | |
| 7 | * | |
| 8 | */ | |
| 9 | ||
| 10 | #include "defs.h" | |
| 51a6db3a BJ |
11 | |
| 12 | MSG BADSYM; | |
| 13 | MSG BADVAR; | |
| 14 | MSG BADKET; | |
| 15 | MSG BADSYN; | |
| 16 | MSG NOCFN; | |
| 17 | MSG NOADR; | |
| 18 | MSG BADLOC; | |
| 19 | ||
| 20 | ADDR lastframe; | |
| 21 | ADDR savlastf; | |
| 22 | ADDR savframe; | |
| 23 | ADDR savpc; | |
| 24 | ADDR callpc; | |
| 25 | ||
| 26 | ||
| 27 | ||
| 28 | CHAR *lp; | |
| 29 | INT radix; | |
| 30 | STRING errflg; | |
| 31 | L_INT localval; | |
| 3d9f6a35 | 32 | CHAR isymbol[1024]; |
| 51a6db3a BJ |
33 | |
| 34 | CHAR lastc,peekc; | |
| 35 | ||
| 36 | L_INT dot; | |
| 37 | L_INT ditto; | |
| 38 | INT dotinc; | |
| 39 | L_INT var[]; | |
| 40 | L_INT expv; | |
| 41 | ||
| 42 | ||
| 43 | ||
| 44 | ||
| 45 | expr(a) | |
| 46 | { /* term | term dyadic expr | */ | |
| 47 | INT rc; | |
| 48 | L_INT lhs; | |
| 49 | ||
| 50 | rdc(); lp--; rc=term(a); | |
| 51 | ||
| 52 | WHILE rc | |
| 53 | DO lhs = expv; | |
| 54 | ||
| 55 | switch ((int)readchar()) { | |
| 56 | ||
| 57 | case '+': | |
| 58 | term(a|1); expv += lhs; break; | |
| 59 | ||
| 60 | case '-': | |
| 61 | term(a|1); expv = lhs - expv; break; | |
| 62 | ||
| 63 | case '#': | |
| 64 | term(a|1); expv = round(lhs,expv); break; | |
| 65 | ||
| 66 | case '*': | |
| 67 | term(a|1); expv *= lhs; break; | |
| 68 | ||
| 69 | case '%': | |
| 70 | term(a|1); expv = lhs/expv; break; | |
| 71 | ||
| 72 | case '&': | |
| 73 | term(a|1); expv &= lhs; break; | |
| 74 | ||
| 75 | case '|': | |
| 76 | term(a|1); expv |= lhs; break; | |
| 77 | ||
| 78 | case ')': | |
| 79 | IF (a&2)==0 THEN error(BADKET); FI | |
| 80 | ||
| 81 | default: | |
| 82 | lp--; | |
| d042e5db | 83 | return(rc); |
| 51a6db3a BJ |
84 | } |
| 85 | OD | |
| 86 | return(rc); | |
| 87 | } | |
| 88 | ||
| 89 | term(a) | |
| 90 | { /* item | monadic item | (expr) | */ | |
| 91 | ||
| 92 | switch ((int)readchar()) { | |
| 93 | ||
| 94 | case '*': | |
| 95 | term(a|1); expv=chkget(expv,DSP); return(1); | |
| 96 | ||
| 97 | case '@': | |
| 98 | term(a|1); expv=chkget(expv,ISP); return(1); | |
| 99 | ||
| 100 | case '-': | |
| 101 | term(a|1); expv = -expv; return(1); | |
| 102 | ||
| 103 | case '~': | |
| 60fd2268 RH |
104 | term(a|1); expv = ~expv; return(1); |
| 105 | ||
| 106 | case '#': | |
| 107 | term(a|1); expv = !expv; return(1); | |
| 108 | ||
| 109 | case '(': | |
| 110 | expr(2); | |
| 111 | IF *lp!=')' | |
| 112 | THEN error(BADSYN); | |
| 113 | ELSE lp++; return(1); | |
| 114 | FI | |
| 115 | ||
| 116 | default: | |
| 117 | lp--; | |
| 118 | return(item(a)); | |
| 119 | } | |
| 120 | } | |
| 121 | ||
| 122 | item(a) | |
| 123 | { /* name [ . local ] | number | . | ^ | <var | <register | 'x | | */ | |
| 124 | INT base, d; | |
| 125 | CHAR savc; | |
| 126 | BOOL hex; | |
| 127 | L_INT frame; | |
| 128 | register struct nlist *symp; | |
| 129 | int regptr; | |
| 130 | ||
| 131 | hex=FALSE; | |
| 132 | ||
| 133 | readchar(); | |
| 134 | IF symchar(0) | |
| 135 | THEN readsym(); | |
| 136 | IF lastc=='.' | |
| 137 | THEN frame= *(ADDR *)(((ADDR)&u)+FP); lastframe=0; | |
| 138 | callpc= *(ADDR *)(((ADDR)&u)+PC); | |
| 139 | WHILE errflg==0 | |
| 140 | DO savpc=callpc; | |
| 141 | findsym(callpc,ISYM); | |
| 142 | IF eqsym(cursym->n_un.n_name,isymbol,'~') | |
| 143 | THEN break; | |
| 144 | FI | |
| 145 | callpc=get(frame+16, DSP); | |
| 146 | lastframe=frame; | |
| 147 | frame=get(frame+12,DSP)&EVEN; | |
| 148 | IF frame==0 | |
| 149 | THEN error(NOCFN); | |
| 150 | FI | |
| 151 | OD | |
| 152 | savlastf=lastframe; savframe=frame; | |
| 153 | readchar(); | |
| 154 | IF symchar(0) | |
| 155 | THEN chkloc(expv=frame); | |
| 156 | FI | |
| 157 | ELIF (symp=lookup(isymbol))==0 THEN error(BADSYM); | |
| 158 | ELSE expv = symp->n_value; | |
| 159 | FI | |
| 160 | lp--; | |
| 51a6db3a BJ |
161 | |
| 162 | ELIF getnum(readchar) | |
| 163 | THEN ; | |
| 164 | ELIF lastc=='.' | |
| 165 | THEN readchar(); | |
| 166 | IF symchar(0) | |
| 167 | THEN lastframe=savlastf; callpc=savpc; | |
| 168 | chkloc(savframe); | |
| 169 | ELSE expv=dot; | |
| 170 | FI | |
| 171 | lp--; | |
| 172 | ||
| 173 | ELIF lastc=='"' | |
| 174 | THEN expv=ditto; | |
| 175 | ||
| 176 | ELIF lastc=='+' | |
| 177 | THEN expv=inkdot(dotinc); | |
| 178 | ||
| 179 | ELIF lastc=='^' | |
| 180 | THEN expv=inkdot(-dotinc); | |
| 181 | ||
| 182 | ELIF lastc=='<' | |
| 183 | THEN savc=rdc(); | |
| 184 | IF regptr=getreg(savc) | |
| 6eadceb1 BJ |
185 | THEN IF kcore THEN expv = *(int *)regptr; |
| 186 | ELSE expv= * (ADDR *)(((ADDR)&u)+regptr); FI | |
| 51a6db3a BJ |
187 | ELIF (base=varchk(savc)) != -1 |
| 188 | THEN expv=var[base]; | |
| 189 | ELSE error(BADVAR); | |
| 190 | FI | |
| 191 | ||
| 192 | ELIF lastc=='\'' | |
| 193 | THEN d=4; expv=0; | |
| 194 | WHILE quotchar() | |
| 195 | DO IF d-- | |
| 8589da02 | 196 | THEN expv = (expv << 8) | lastc; |
| 51a6db3a BJ |
197 | ELSE error(BADSYN); |
| 198 | FI | |
| 199 | OD | |
| 200 | ||
| 201 | ELIF a | |
| 202 | THEN error(NOADR); | |
| 203 | ELSE lp--; return(0); | |
| 204 | FI | |
| 205 | return(1); | |
| 206 | } | |
| 207 | ||
| 208 | /* service routines for expression reading */ | |
| 209 | getnum(rdf) int (*rdf)(); | |
| 210 | { | |
| 211 | INT base,d,frpt; | |
| 212 | BOOL hex; | |
| 213 | UNION{REAL r; L_INT i;} real; | |
| 214 | IF isdigit(lastc) ORF (hex=TRUE, lastc=='#' ANDF isxdigit((*rdf)())) | |
| 215 | THEN expv = 0; | |
| 216 | base = (hex ? 16 : radix); | |
| 217 | WHILE (base>10 ? isxdigit(lastc) : isdigit(lastc)) | |
| 218 | DO expv = (base==16 ? expv<<4 : expv*base); | |
| 219 | IF (d=convdig(lastc))>=base THEN error(BADSYN); FI | |
| 220 | expv += d; (*rdf)(); | |
| 221 | IF expv==0 | |
| 222 | THEN IF (lastc=='x' ORF lastc=='X') | |
| 223 | THEN hex=TRUE; base=16; (*rdf)(); | |
| 224 | ELIF (lastc=='t' ORF lastc=='T') | |
| 225 | THEN hex=FALSE; base=10; (*rdf)(); | |
| 226 | ELIF (lastc=='o' ORF lastc=='O') | |
| 227 | THEN hex=FALSE; base=8; (*rdf)(); | |
| 228 | FI | |
| 229 | FI | |
| 230 | OD | |
| 231 | IF lastc=='.' ANDF (base==10 ORF expv==0) ANDF !hex | |
| 232 | THEN real.r=expv; frpt=0; base=10; | |
| 233 | WHILE isdigit((*rdf)()) | |
| 234 | DO real.r *= base; frpt++; | |
| 235 | real.r += lastc-'0'; | |
| 236 | OD | |
| 237 | WHILE frpt-- | |
| 238 | DO real.r /= base; OD | |
| 239 | expv = real.i; | |
| 240 | FI | |
| 241 | peekc=lastc; | |
| 242 | /* lp--; */ | |
| 243 | return(1); | |
| 244 | ELSE return(0); | |
| 245 | FI | |
| 246 | } | |
| 247 | ||
| 248 | readsym() | |
| 249 | { | |
| 250 | REG char *p; | |
| 251 | ||
| 252 | p = isymbol; | |
| 253 | REP IF p < &isymbol[sizeof(isymbol)-1] | |
| 254 | THEN *p++ = lastc; | |
| 255 | FI | |
| 256 | readchar(); | |
| 257 | PER symchar(1) DONE | |
| 258 | *p++ = 0; | |
| 259 | } | |
| 260 | ||
| 261 | convdig(c) | |
| 262 | CHAR c; | |
| 263 | { | |
| 264 | IF isdigit(c) | |
| 265 | THEN return(c-'0'); | |
| 266 | ELIF isxdigit(c) | |
| 267 | THEN return(c-'a'+10); | |
| 268 | ELSE return(17); | |
| 269 | FI | |
| 270 | } | |
| 271 | ||
| 272 | symchar(dig) | |
| 273 | { | |
| 274 | IF lastc=='\\' THEN readchar(); return(TRUE); FI | |
| 275 | return( isalpha(lastc) ORF lastc=='_' ORF dig ANDF isdigit(lastc) ); | |
| 276 | } | |
| 277 | ||
| 278 | varchk(name) | |
| 279 | { | |
| 280 | IF isdigit(name) THEN return(name-'0'); FI | |
| 281 | IF isalpha(name) THEN return((name&037)-1+10); FI | |
| 282 | return(-1); | |
| 283 | } | |
| 284 | ||
| 285 | chkloc(frame) | |
| 286 | L_INT frame; | |
| 287 | { | |
| 288 | readsym(); | |
| 289 | REP IF localsym(frame)==0 THEN error(BADLOC); FI | |
| 290 | expv=localval; | |
| 291 | PER !eqsym(cursym->n_un.n_name,isymbol,'~') DONE | |
| 292 | } | |
| 293 | ||
| 294 | eqsym(s1, s2, c) | |
| 295 | register char *s1, *s2; | |
| 296 | { | |
| 297 | ||
| 298 | if (!strcmp(s1,s2)) | |
| 299 | return (1); | |
| 300 | if (*s1 == c && !strcmp(s1+1, s2)) | |
| 301 | return (1); | |
| 302 | return (0); | |
| 303 | } |