9 /* this contains the code to prepare the kernel data structures and to parse records */
15 /* we could just rely on the types in the expression tree but i'm paranoid */
16 typedef struct Val Val;
37 case VALINT: r.v = va_arg(va, uvlong); break;
38 case VALSTR: r.s = va_arg(va, char*); break;
47 clause = emalloc(sizeof(Clause));
48 clause->id = nclauses;
54 clause->probs = erealloc(clause->probs, sizeof(char *) * (clause->nprob + 1));
55 clause->probs[clause->nprob++] = strdup(s);
59 addstat(int type, ...)
64 clause->stats = erealloc(clause->stats, sizeof(Stat) * (clause->nstats + 1));
65 s = &clause->stats[clause->nstats++];
66 memset(s, 0, sizeof(Stat));
71 s->n = va_arg(va, Node *);
77 sysfatal("addstat: unknown type %d", type);
87 assert(clause->nstats > 0);
88 s = &clause->stats[clause->nstats - 1];
89 s->arg = erealloc(s->arg, sizeof(Node *) * (s->narg + 1));
90 s->arg[s->narg++] = n;
96 clauses = erealloc(clauses, sizeof(Clause) * (nclauses + 1));
97 clauses[nclauses++] = clause;
101 actgradd(DTActGr *a, DTAct b)
103 a->acts = erealloc(a->acts, sizeof(DTAct) * (a->nact + 1));
104 a->acts[a->nact++] = b;
114 prepprintf(Node **arg, int narg, DTActGr *g, int *recoff)
120 if(narg <= 0) sysfatal("printf() needs an argument");
121 if((*arg)->type != OSTR) sysfatal("printf() format string must be a literal");
125 for(; *fmt != 0; fmt++){
132 case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9':
133 case 'u': case '+': case '-': case ',': case '#': case ' ': case '.':
137 case 'x': case 'X': case 'o': case 'b': case 'd':
138 if(n >= narg) sysfatal("printf() too few arguments");
139 if(arg[n]->typ->type != TYPINT) sysfatal("print() %%%c with non-integer", *fmt);
140 arg[n] = tracegen(arg[n], g, recoff);
147 if(n >= narg) sysfatal("printf() too few arguments");
148 if(arg[n]->typ->type != TYPSTRING) sysfatal("print() %%s with non-string");
149 arg[n] = tracegen(arg[n], g, recoff);
153 case 0: sysfatal("printf() missing verb");
154 default: sysfatal("printf() unknown verb %%%c", *fmt);
157 if(n < narg) sysfatal("printf() too many arguments");
158 (*arg)->str = fmtstrflush(&f);
162 mkdtclause(Clause *c)
168 d = emalloc(sizeof(DTClause));
171 d->gr = emalloc(sizeof(DTActGr));
172 d->gr->pred = c->pred;
175 for(s = c->stats; s < c->stats + c->nstats; s++)
178 actgradd(d->gr, (DTAct){ACTTRACE, codegen(s->n), 0});
181 for(i = 0; i < s->narg; i++)
182 s->arg[i] = tracegen(s->arg[i], d->gr, &recoff);
185 prepprintf(s->arg, s->narg, d->gr, &recoff);
197 for(i = 0; i < nclauses; i++){
198 d = mkdtclause(clauses[i]);
203 /* epid lookup table, filled with info from the kernel */
207 addepid(u32int epid, u32int cid, int reclen, char *p)
211 assert(cid < nclauses);
212 assert((uint)reclen >= 12);
213 e = emalloc(sizeof(Enab));
215 e->cl = clauses[cid];
217 e->probe = strdup(p);
218 ep = &enabtab[epid % nelem(enabtab)];
224 epidlookup(u32int epid)
228 for(e = enabtab[epid % nelem(enabtab)]; e != nil; e = e->next)
235 unpack(uchar *p, uchar *e, char *fmt, ...)
244 if(p + 1 > e) return nil;
245 *va_arg(va, u8int *) = p[0];
249 if(p + 2 > e) return nil;
250 *va_arg(va, u16int *) = p[0] | p[1] << 8;
254 if(p + 4 > e) return nil;
255 *va_arg(va, u32int *) = p[0] | p[1] << 8 | p[2] << 16 | p[3] << 24;
259 if(p + 8 > e) return nil;
260 vl = p[0] | p[1] << 8 | p[2] << 16 | p[3] << 24;
261 vl |= (uvlong)p[4] << 32 | (uvlong)p[5] << 40 | (uvlong)p[6] << 48 | (uvlong)p[7] << 56;
262 *va_arg(va, u64int *) = vl;
273 receval(Node *n, uchar *p, uchar *e, Enab *en)
285 switch(n->sym->type){
289 q = unpack(p + 4, e, "v", &v);
291 return mkval(VALINT, v);
293 return mkval(VALSTR, en->probe);
294 default: sysfatal("receval: unknown variable %d", n->type); return mkval(VALINT, 0LL);
297 default: sysfatal("receval: unknown symbol type %d", n->type); return mkval(VALINT, 0LL);
299 case ONUM: return mkval(VALINT, n->num);
301 a = receval(n->n1, p, e, en);
302 b = receval(n->n2, p, e, en);
303 assert(a.type == VALINT);
304 assert(b.type == VALINT);
305 return mkval(VALINT, evalop(n->op, n->typ->sign, a.v, b.v));
307 a = receval(n->n1, p, e, en);
308 assert(a.type == VALINT);
309 return mkval(VALINT, (uvlong) !a.v);
311 a = receval(n->n1, p, e, en);
312 assert(a.type == VALINT);
313 return a.v ? receval(n->n2, p, e, en) : receval(n->n3, p, e, en);
315 switch(n->typ->type){
317 switch(n->typ->size){
318 case 1: q = unpack(p + n->num, e, "c", &c); v = n->typ->sign ? (s8int)c : (u8int)c; break;
319 case 2: q = unpack(p + n->num, e, "s", &s); v = n->typ->sign ? (s16int)s : (u16int)s; break;
320 case 4: q = unpack(p + n->num, e, "i", &i); v = n->typ->sign ? (s32int)i : (u32int)i; break;
321 case 8: q = unpack(p + n->num, e, "v", &v); break;
325 return mkval(VALINT, v);
327 assert(p + n->num + n->typ->size <= e);
328 sp = emalloc(n->typ->size + 1);
329 memcpy(sp, p + n->num, n->typ->size);
330 return mkval(VALSTR, sp); /* TODO: fix leak */
332 sysfatal("receval: don't know how to parse record for %τ", n->typ);
335 sysfatal("receval: unknown type %α", n->type);
336 return mkval(VALINT, 0LL);
341 execprintf(Node **arg, int narg, uchar *p, uchar *e, Enab *en)
347 x = emalloc(sizeof(uvlong) * (narg - 1));
349 for(i = 0; i < narg - 1; i++){
350 v = receval(arg[i + 1], p, e, en);
354 xp += sizeof(uvlong);
363 vfprint(1, (*arg)->str, (va_list) x);
368 parseclause(Clause *cl, uchar *p, uchar *e, Enab *en, Biobuf *bp)
374 for(s = cl->stats; s < cl->stats + cl->nstats; s++)
376 case STATEXPR: break;
378 for(i = 0; i < s->narg; i++){
379 v = receval(s->arg[i], p, e, en);
382 Bprint(bp, "%lld", v.v);
385 Bprint(bp, "%s", v.s);
387 default: sysfatal("parseclause: unknown val type %d", s->type);
389 Bprint(bp, "%c", i == s->narg - 1 ? '\n' : ' ');
393 execprintf(s->arg, s->narg, p, e, en);
396 sysfatal("parseclause: unknown type %d", s->type);
402 parsebuf(uchar *p, int n, Biobuf *bp)
411 p = unpack(p, e, "iv", &epid, &ts);
412 if(p == nil) goto err;
413 en = epidlookup(epid);
414 if(en == nil) goto err;
415 if(parseclause(en->cl, p - 12, p + en->reclen - 12, en, bp) < 0) return -1;
416 p += en->reclen - 12;
420 werrstr("buffer invalid");
425 dumpexpr(DTExpr *e, char *prefix)
429 for(i = 0; i < e->n; i++)
430 print("%s%.8ux %I\n", prefix, e->b[i], e->b[i]);
433 #pragma varargck type "ε" Node*
436 fmtstring(Fmt *f, char *s)
441 case '\n': fmtprint(f, "\\n"); break;
442 case '\r': fmtprint(f, "\\r"); break;
443 case '\t': fmtprint(f, "\\t"); break;
444 case '\v': fmtprint(f, "\\v"); break;
445 case '\b': fmtprint(f, "\\b"); break;
446 case '\a': fmtprint(f, "\\a"); break;
447 case '"': fmtprint(f, "\""); break;
448 case '\\': fmtprint(f, "\\"); break;
450 if(*s < 0x20 || *s >= 0x7f)
451 fmtprint(f, "\\%.3o", (uchar)*s);
458 typedef struct Op Op;
462 enum { PRECRIGHT = 1 } flags;
464 static Op optab[] = {
465 [OPLOR] {"||", 3, 0},
466 [OPLAND] {"&&", 4, 0},
468 [OPXNOR] {"~^", 6, 0},
475 [OPLSH] {"<<", 10, 0},
476 [OPRSH] {">>", 10, 0},
477 [OPADD] {"+", 11, 0},
478 [OPSUB] {"-", 11, 0},
479 [OPDIV] {"/", 12, 0},
480 [OPMOD] {"%", 12, 0},
481 [OPMUL] {"*", 12, 0},
483 enum { PREDUNARY = 14 };
493 n = va_arg(f->args, Node *);
495 case OSYM: fmtprint(f, "%s", n->sym->name); break;
496 case ONUM: fmtprint(f, "%lld", n->num); break;
497 case OSTR: fmtstring(f, n->str); break;
499 if(n->op >= nelem(optab) || optab[n->op].name == nil)
500 fmtprint(f, "(%*ε ??op%d %*ε)", PREDUNARY, n->n1, n->op, PREDUNARY, n->n2);
503 if(op->pred < p) fmtrune(f, '(');
504 fmtprint(f, "%*ε %s %*ε", op->pred + (op->flags & PRECRIGHT), n->n1, op->name, op->pred + (~op->flags & PRECRIGHT), n->n2);
505 if(op->pred < p) fmtrune(f, ')');
508 case OLNOT: fmtprint(f, "!%*ε", PREDUNARY, n->n1); break;
509 case OTERN: fmtprint(f, "%2ε ? %1ε : %1ε", n->n1, n->n2, n->n3); break;
510 case ORECORD: fmtprint(f, "record(%ε, %τ, %d)", n->n1, n->typ, (int)n->num); break;
511 case OCAST: fmtprint(f, "(%τ) %*ε", n->typ, PREDUNARY, n->n1); break;
512 default: fmtprint(f, "??? %α", n->type);
526 for(i = 0; i < nclauses; i++){
529 print("clause %d:\n", c->id);
530 for(j = 0; j < c->nprob; j++)
531 print("\tprobe '%s'\n", c->probs[j]);
532 print("\tkernel code:\n");
534 print("\t\tno predicate\n");
536 print("\t\tpredicate\n");
537 dumpexpr(c->pred, "\t\t\t");
539 for(a = d->gr->acts; a < d->gr->acts + d->gr->nact; a++)
542 print("\t\ttrace (%d bytes)\n", a->size);
543 dumpexpr(a->p, "\t\t\t");
546 print("\t\ttrace string (%d bytes)\n", a->size);
547 dumpexpr(a->p, "\t\t\t");
550 print("\t\t??? %d\n", a->type);
552 print("\trecord formatting:\n");
553 for(s = c->stats; s < c->stats + c->nstats; s++)
558 print("\t\tprint\n");
559 for(j = 0; j < s->narg; j++)
560 print("\t\t\targ %ε\n", s->arg[j]);
563 print("\t\tprintf\n");
564 for(j = 0; j < s->narg; j++)
565 print("\t\t\targ %ε\n", s->arg[j]);
568 print("\t\t??? %d\n", s->type);