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[/] [eco32/] [trunk/] [lcc/] [src/] [dag.c] - Blame information for rev 190

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Line No. Rev Author Line
1 4 hellwig 
#include "c.h"
2 
 
3 
static char rcsid[] = "$Id: dag.c,v 1.1 2002/08/28 23:12:42 drh Exp $";
4 
 
5 
#define iscall(op) (generic(op) == CALL \
6 
        || IR->mulops_calls \
7 
        && (generic(op)==DIV||generic(op)==MOD||generic(op)==MUL) \
8 
        && ( optype(op)==U  || optype(op)==I))
9 
static Node forest;
10 
static struct dag {
11 
        struct node node;
12 
        struct dag *hlink;
13 
} *buckets[16];
14 
int nodecount;
15 
static Tree firstarg;
16 
int assignargs = 1;
17 
int prunetemps = -1;
18 
static Node *tail;
19 
 
20 
static int depth = 0;
21 
static Node replace(Node);
22 
static Node prune(Node);
23 
static Node asgnnode(Symbol, Node);
24 
static struct dag *dagnode(int, Node, Node, Symbol);
25 
static Symbol equated(Symbol);
26 
static void fixup(Node);
27 
static void labelnode(int);
28 
static void list(Node);
29 
static void killnodes(Symbol);
30 
static Node node(int, Node, Node, Symbol);
31 
static void printdag1(Node, int, int);
32 
static void printnode(Node, int, int);
33 
static void reset(void);
34 
static Node tmpnode(Node);
35 
static void typestab(Symbol, void *);
36 
static Node undag(Node);
37 
static Node visit(Node, int);
38 
static void unlist(void);
39 
void walk(Tree tp, int tlab, int flab) {
40 
        listnodes(tp, tlab, flab);
41 
        if (forest) {
42 
                Node list = forest->link;
43 
                forest->link = NULL;
44 
                if (!IR->wants_dag && errcnt == 0)
45 
                        list = undag(list);
46 
                code(Gen)->u.forest = list;
47 
                forest = NULL;
48 
        }
49 
        reset();
50 
        deallocate(STMT);
51 
}
52 
 
53 
static Node node(int op, Node l, Node r, Symbol sym) {
54 
        int i;
55 
        struct dag *p;
56 
 
57 
        i = (opindex(op)^((unsigned long)sym>>2))&(NELEMS(buckets)-1);
58 
        for (p = buckets[i]; p; p = p->hlink)
59 
                if (p->node.op      == op && p->node.syms[0] == sym
60 
                &&  p->node.kids[0] == l  && p->node.kids[1] == r)
61 
                        return &p->node;
62 
        p = dagnode(op, l, r, sym);
63 
        p->hlink = buckets[i];
64 
        buckets[i] = p;
65 
        ++nodecount;
66 
        return &p->node;
67 
}
68 
static struct dag *dagnode(int op, Node l, Node r, Symbol sym) {
69 
        struct dag *p;
70 
 
71 
        NEW0(p, FUNC);
72 
        p->node.op = op;
73 
        if ((p->node.kids[0] = l) != NULL)
74 
                ++l->count;
75 
        if ((p->node.kids[1] = r) != NULL)
76 
                ++r->count;
77 
        p->node.syms[0] = sym;
78 
        return p;
79 
}
80 
Node newnode(int op, Node l, Node r, Symbol sym) {
81 
        return &dagnode(op, l, r, sym)->node;
82 
}
83 
static void killnodes(Symbol p) {
84 
        int i;
85 
        struct dag **q;
86 
 
87 
        for (i = 0; i < NELEMS(buckets); i++)
88 
                for (q = &buckets[i]; *q; )
89 
                        if (generic((*q)->node.op) == INDIR &&
90 
                            (!isaddrop((*q)->node.kids[0]->op)
91 
                             || (*q)->node.kids[0]->syms[0] == p)) {
92 
                                *q = (*q)->hlink;
93 
                                --nodecount;
94 
                        } else
95 
                                q = &(*q)->hlink;
96 
}
97 
static void reset(void) {
98 
        if (nodecount > 0)
99 
                memset(buckets, 0, sizeof buckets);
100 
        nodecount = 0;
101 
}
102 
Node listnodes(Tree tp, int tlab, int flab) {
103 
        Node p = NULL, l, r;
104 
        int op;
105 
 
106 
        assert(tlab || flab || tlab == 0 && flab == 0);
107 
        if (tp == NULL)
108 
                return NULL;
109 
        if (tp->node)
110 
                return tp->node;
111 
        if (isarray(tp->type))
112 
                op = tp->op + sizeop(voidptype->size);
113 
        else
114 
                op = tp->op + sizeop(tp->type->size);
115 
        switch (generic(tp->op)) {
116 
        case AND:   { if (depth++ == 0) reset();
117 
                      if (flab) {
118 
                        listnodes(tp->kids[0], 0, flab);
119 
                        listnodes(tp->kids[1], 0, flab);
120 
                      } else {
121 
                        listnodes(tp->kids[0], 0, flab = genlabel(1));
122 
                        listnodes(tp->kids[1], tlab, 0);
123 
                        labelnode(flab);
124 
                      }
125 
                      depth--; } break;
126 
        case OR:    { if (depth++ == 0)
127 
                        reset();
128 
                      if (tlab) {
129 
                        listnodes(tp->kids[0], tlab, 0);
130 
                        listnodes(tp->kids[1], tlab, 0);
131 
                      } else {
132 
                        tlab = genlabel(1);
133 
                        listnodes(tp->kids[0], tlab, 0);
134 
                        listnodes(tp->kids[1], 0, flab);
135 
                        labelnode(tlab);
136 
                      }
137 
                      depth--;
138 
 } break;
139 
        case NOT:   { return listnodes(tp->kids[0], flab, tlab); }
140 
        case COND:  { Tree q = tp->kids[1];
141 
                      assert(tlab == 0 && flab == 0);
142 
                      if (tp->u.sym)
143 
                        addlocal(tp->u.sym);
144 
                      flab = genlabel(2);
145 
                      listnodes(tp->kids[0], 0, flab);
146 
                      assert(q && q->op == RIGHT);
147 
                      reset();
148 
                      listnodes(q->kids[0], 0, 0);
149 
                      if (forest->op == LABEL+V) {
150 
                        equatelab(forest->syms[0], findlabel(flab + 1));
151 
                        unlist();
152 
                      }
153 
                      list(jump(flab + 1));
154 
                      labelnode(flab);
155 
                      listnodes(q->kids[1], 0, 0);
156 
                      if (forest->op == LABEL+V) {
157 
                        equatelab(forest->syms[0], findlabel(flab + 1));
158 
                        unlist();
159 
                      }
160 
                      labelnode(flab + 1);
161 
 
162 
                      if (tp->u.sym)
163 
                        p = listnodes(idtree(tp->u.sym), 0, 0); } break;
164 
        case CNST:  { Type ty = unqual(tp->type);
165 
                      assert(ty->u.sym);
166 
                      if (tlab || flab) {
167 
                        assert(ty == inttype);
168 
                        if (tlab && tp->u.v.i != 0)
169 
                                list(jump(tlab));
170 
                        else if (flab && tp->u.v.i == 0)
171 
                                list(jump(flab));
172 
                      }
173 
                      else if (ty->u.sym->addressed)
174 
                        p = listnodes(cvtconst(tp), 0, 0);
175 
                      else
176 
                        p = node(op, NULL, NULL, constant(ty, tp->u.v)); } break;
177 
        case RIGHT: { if (   tp->kids[0] && tp->kids[1]
178 
                          &&  generic(tp->kids[1]->op) == ASGN
179 
                          && (generic(tp->kids[0]->op) == INDIR
180 
                          && tp->kids[0]->kids[0] == tp->kids[1]->kids[0]
181 
                          || (tp->kids[0]->op == FIELD
182 
                          &&  tp->kids[0] == tp->kids[1]->kids[0]))) {
183 
                        assert(tlab == 0 && flab == 0);
184 
                        if (generic(tp->kids[0]->op) == INDIR) {
185 
                                p = listnodes(tp->kids[0], 0, 0);
186 
                                list(p);
187 
                                listnodes(tp->kids[1], 0, 0);
188 
                        }
189 
                        else {
190 
                                assert(generic(tp->kids[0]->kids[0]->op) == INDIR);
191 
                                list(listnodes(tp->kids[0]->kids[0], 0, 0));
192 
                                p = listnodes(tp->kids[0], 0, 0);
193 
                                listnodes(tp->kids[1], 0, 0);
194 
                        }
195 
                      } else if (tp->kids[1]) {
196 
                        listnodes(tp->kids[0], 0, 0);
197 
                        p = listnodes(tp->kids[1], tlab, flab);
198 
                      } else
199 
                        p = listnodes(tp->kids[0], tlab, flab); } break;
200 
        case JUMP:  { assert(tlab == 0 && flab == 0);
201 
                      assert(tp->u.sym == 0);
202 
                      assert(tp->kids[0]);
203 
                      l = listnodes(tp->kids[0], 0, 0);
204 
                      list(newnode(JUMP+V, l, NULL, NULL));
205 
                      reset(); } break;
206 
        case CALL:  { Tree save = firstarg;
207 
                      firstarg = NULL;
208 
                      assert(tlab == 0 && flab == 0);
209 
                      if (tp->op == CALL+B && !IR->wants_callb) {
210 
                        Tree arg0 = tree(ARG+P, tp->kids[1]->type,
211 
                                tp->kids[1], NULL);
212 
                        if (IR->left_to_right)
213 
                                firstarg = arg0;
214 
                        l = listnodes(tp->kids[0], 0, 0);
215 
                        if (!IR->left_to_right || firstarg) {
216 
                                firstarg = NULL;
217 
                                listnodes(arg0, 0, 0);
218 
                        }
219 
                        p = newnode(CALL+V, l, NULL, NULL);
220 
                      } else {
221 
                        l = listnodes(tp->kids[0], 0, 0);
222 
                        r = listnodes(tp->kids[1], 0, 0);
223 
                        p = newnode(tp->op == CALL+B ? tp->op : op, l, r, NULL);
224 
                      }
225 
                      NEW0(p->syms[0], FUNC);
226 
                      assert(isptr(tp->kids[0]->type));
227 
                      assert(isfunc(tp->kids[0]->type->type));
228 
                      p->syms[0]->type = tp->kids[0]->type->type;
229 
                      list(p);
230 
                      reset();
231 
                      cfunc->u.f.ncalls++;
232 
                      firstarg = save;
233 
 } break;
234 
        case ARG:   { assert(tlab == 0 && flab == 0);
235 
                      if (IR->left_to_right)
236 
                        listnodes(tp->kids[1], 0, 0);
237 
                      if (firstarg) {
238 
                        Tree arg = firstarg;
239 
                        firstarg = NULL;
240 
                        listnodes(arg, 0, 0);
241 
                      }
242 
                      l = listnodes(tp->kids[0], 0, 0);
243 
                      list(newnode(tp->op == ARG+B ? tp->op : op, l, NULL, NULL));
244 
                      forest->syms[0] = intconst(tp->type->size);
245 
                      forest->syms[1] = intconst(tp->type->align);
246 
                      if (!IR->left_to_right)
247 
                        listnodes(tp->kids[1], 0, 0); } break;
248 
        case EQ:  case NE: case GT: case GE: case LE:
249 
        case LT:    { assert(tp->u.sym == 0);
250 
                      assert(errcnt || tlab || flab);
251 
                      l = listnodes(tp->kids[0], 0, 0);
252 
                      r = listnodes(tp->kids[1], 0, 0);
253 
                      assert(errcnt || opkind(l->op) == opkind(r->op));
254 
                      assert(errcnt || optype(op) == optype(l->op));
255 
                      if (tlab)
256 
                        assert(flab == 0),
257 
                        list(newnode(generic(tp->op) + opkind(l->op), l, r, findlabel(tlab)));
258 
                      else if (flab) {
259 
                        switch (generic(tp->op)) {
260 
                        case EQ: op = NE; break;
261 
                        case NE: op = EQ; break;
262 
                        case GT: op = LE; break;
263 
                        case LT: op = GE; break;
264 
                        case GE: op = LT; break;
265 
                        case LE: op = GT; break;
266 
                        default: assert(0);
267 
                        }
268 
                        list(newnode(op + opkind(l->op), l, r, findlabel(flab)));
269 
                      }
270 
                      if (forest && forest->syms[0])
271 
                        forest->syms[0]->ref++; } break;
272 
        case ASGN:  { assert(tlab == 0 && flab == 0);
273 
                      if (tp->kids[0]->op == FIELD) {
274 
                        Tree  x = tp->kids[0]->kids[0];
275 
                        Field f = tp->kids[0]->u.field;
276 
                        assert(generic(x->op) == INDIR);
277 
                        reset();
278 
                        l = listnodes(lvalue(x), 0, 0);
279 
                        if (fieldsize(f) < 8*f->type->size) {
280 
                                unsigned int fmask = fieldmask(f);
281 
                                unsigned int  mask = fmask<<fieldright(f);
282 
                                Tree q = tp->kids[1];
283 
                                if (q->op == CNST+I && q->u.v.i == 0
284 
                                ||  q->op == CNST+U && q->u.v.u == 0)
285 
                                        q = bittree(BAND, x, cnsttree(unsignedtype, (unsigned long)~mask));
286 
                                else if (q->op == CNST+I && (q->u.v.i&fmask) == fmask
287 
                                ||       q->op == CNST+U && (q->u.v.u&fmask) == fmask)
288 
                                        q = bittree(BOR, x, cnsttree(unsignedtype, (unsigned long)mask));
289 
                                else {
290 
                                        listnodes(q, 0, 0);
291 
                                        q = bittree(BOR,
292 
                                                bittree(BAND, rvalue(lvalue(x)),
293 
                                                        cnsttree(unsignedtype, (unsigned long)~mask)),
294 
                                                bittree(BAND, shtree(LSH, cast(q, unsignedtype),
295 
                                                        cnsttree(unsignedtype, (unsigned long)fieldright(f))),
296 
                                                        cnsttree(unsignedtype, (unsigned long)mask)));
297 
                                }
298 
                                r = listnodes(q, 0, 0);
299 
                                op = ASGN + ttob(q->type);
300 
                        } else {
301 
                                r = listnodes(tp->kids[1], 0, 0);
302 
                                op = ASGN + ttob(tp->kids[1]->type);
303 
                        }
304 
                      } else {
305 
                        l = listnodes(tp->kids[0], 0, 0);
306 
                        r = listnodes(tp->kids[1], 0, 0);
307 
                      }
308 
                      list(newnode(tp->op == ASGN+B ? tp->op : op, l, r, NULL));
309 
                      forest->syms[0] = intconst(tp->kids[1]->type->size);
310 
                      forest->syms[1] = intconst(tp->kids[1]->type->align);
311 
                      if (isaddrop(tp->kids[0]->op)
312 
                      && !tp->kids[0]->u.sym->computed)
313 
                        killnodes(tp->kids[0]->u.sym);
314 
                      else
315 
                        reset();
316 
                      p = listnodes(tp->kids[1], 0, 0); } break;
317 
        case BOR: case BAND: case BXOR:
318 
        case ADD: case SUB:  case RSH:
319 
        case LSH:   { assert(tlab == 0 && flab == 0);
320 
                      l = listnodes(tp->kids[0], 0, 0);
321 
                      r = listnodes(tp->kids[1], 0, 0);
322 
                      p = node(op, l, r, NULL); } break;
323 
        case DIV: case MUL:
324 
        case MOD:   { assert(tlab == 0 && flab == 0);
325 
                      l = listnodes(tp->kids[0], 0, 0);
326 
                      r = listnodes(tp->kids[1], 0, 0);
327 
                      p = node(op, l, r, NULL);
328 
                      if (IR->mulops_calls && isint(tp->type)) {
329 
                        list(p);
330 
                        cfunc->u.f.ncalls++;
331 
                      } } break;
332 
        case RET:   { assert(tlab == 0 && flab == 0);
333 
                      l = listnodes(tp->kids[0], 0, 0);
334 
                      list(newnode(op, l, NULL, NULL)); } break;
335 
        case CVF: case CVI: case CVP:
336 
        case CVU:   { assert(tlab == 0 && flab == 0);
337 
                      assert(optype(tp->kids[0]->op) != optype(tp->op) || tp->kids[0]->type->size != tp->type->size);
338 
                      l = listnodes(tp->kids[0], 0, 0);
339 
                      p = node(op, l, NULL, intconst(tp->kids[0]->type->size));
340 
 } break;
341 
        case BCOM:
342 
        case NEG:   { assert(tlab == 0 && flab == 0);
343 
                      l = listnodes(tp->kids[0], 0, 0);
344 
                      p = node(op, l, NULL, NULL); } break;
345 
        case INDIR: { Type ty = tp->kids[0]->type;
346 
                      assert(tlab == 0 && flab == 0);
347 
                      l = listnodes(tp->kids[0], 0, 0);
348 
                      if (isptr(ty))
349 
                        ty = unqual(ty)->type;
350 
                      if (isvolatile(ty)
351 
                      || (isstruct(ty) && unqual(ty)->u.sym->u.s.vfields))
352 
                        p = newnode(tp->op == INDIR+B ? tp->op : op, l, NULL, NULL);
353 
                      else
354 
                        p = node(tp->op == INDIR+B ? tp->op : op, l, NULL, NULL); } break;
355 
        case FIELD: { Tree q = tp->kids[0];
356 
                      if (tp->type == inttype) {
357 
                        long n = fieldleft(tp->u.field);
358 
                        q = shtree(RSH,
359 
                                shtree(LSH, q, cnsttree(inttype, n)),
360 
                                cnsttree(inttype, n + fieldright(tp->u.field)));
361 
                      } else if (fieldsize(tp->u.field) < 8*tp->u.field->type->size)
362 
                        q = bittree(BAND,
363 
                                shtree(RSH, q, cnsttree(inttype, (long)fieldright(tp->u.field))),
364 
                                cnsttree(unsignedtype, (unsigned long)fieldmask(tp->u.field)));
365 
                      assert(tlab == 0 && flab == 0);
366 
                      p = listnodes(q, 0, 0); } break;
367 
        case ADDRG:
368 
        case ADDRF: { assert(tlab == 0 && flab == 0);
369 
                      p = node(tp->op + sizeop(voidptype->size), NULL, NULL, tp->u.sym);
370 
 } break;
371 
        case ADDRL: { assert(tlab == 0 && flab == 0);
372 
                      if (tp->u.sym->generated)
373 
                        addlocal(tp->u.sym);
374 
                      p = node(tp->op + sizeop(voidptype->size), NULL, NULL, tp->u.sym); } break;
375 
        default:assert(0);
376 
        }
377 
        tp->node = p;
378 
        return p;
379 
}
380 
static void list(Node p) {
381 
        if (p && p->link == NULL) {
382 
                if (forest) {
383 
                        p->link = forest->link;
384 
                        forest->link = p;
385 
                } else
386 
                        p->link = p;
387 
                forest = p;
388 
        }
389 
}
390 
static void labelnode(int lab) {
391 
        assert(lab);
392 
        if (forest && forest->op == LABEL+V)
393 
                equatelab(findlabel(lab), forest->syms[0]);
394 
        else
395 
                list(newnode(LABEL+V, NULL, NULL, findlabel(lab)));
396 
        reset();
397 
}
398 
static void unlist(void) {
399 
        Node p;
400 
 
401 
        assert(forest);
402 
        assert(forest != forest->link);
403 
        p = forest->link;
404 
        while (p->link != forest)
405 
                p = p->link;
406 
        p->link = forest->link;
407 
        forest = p;
408 
}
409 
Tree cvtconst(Tree p) {
410 
        Symbol q = constant(p->type, p->u.v);
411 
        Tree e;
412 
 
413 
        if (q->u.c.loc == NULL)
414 
                q->u.c.loc = genident(STATIC, p->type, GLOBAL);
415 
        if (isarray(p->type)) {
416 
                e = simplify(ADDRG, atop(p->type), NULL, NULL);
417 
                e->u.sym = q->u.c.loc;
418 
        } else
419 
                e = idtree(q->u.c.loc);
420 
        return e;
421 
}
422 
void gencode(Symbol caller[], Symbol callee[]) {
423 
        Code cp;
424 
        Coordinate save;
425 
 
426 
        if (prunetemps == -1)
427 
                prunetemps = !IR->wants_dag;
428 
        save = src;
429 
        if (assignargs) {
430 
                int i;
431 
                Symbol p, q;
432 
                cp = codehead.next->next;
433 
                codelist = codehead.next;
434 
                for (i = 0; (p = callee[i]) != NULL
435 
                         && (q = caller[i]) != NULL; i++)
436 
                        if (p->sclass != q->sclass || p->type != q->type)
437 
                                walk(asgn(p, idtree(q)), 0, 0);
438 
                codelist->next = cp;
439 
                cp->prev = codelist;
440 
        }
441 
        if (glevel && IR->stabsym) {
442 
                int i;
443 
                Symbol p, q;
444 
                for (i = 0; (p = callee[i]) != NULL
445 
                         && (q = caller[i]) != NULL; i++) {
446 
                        (*IR->stabsym)(p);
447 
                        if (p->sclass != q->sclass || p->type != q->type)
448 
                                (*IR->stabsym)(q);
449 
                }
450 
                swtoseg(CODE);
451 
        }
452 
        cp = codehead.next;
453 
        for ( ; errcnt <= 0 && cp; cp = cp->next)
454 
                switch (cp->kind) {
455 
                case Address:  assert(IR->address);
456 
                               (*IR->address)(cp->u.addr.sym, cp->u.addr.base,
457 
                                cp->u.addr.offset); break;
458 
                case Blockbeg: {
459 
                                Symbol *p = cp->u.block.locals;
460 
                                (*IR->blockbeg)(&cp->u.block.x);
461 
                                for ( ; *p; p++)
462 
                                        if ((*p)->ref != 0.0)
463 
                                                (*IR->local)(*p);
464 
                                        else if (glevel) (*IR->local)(*p);
465 
                               }
466 
 break;
467 
                case Blockend: (*IR->blockend)(&cp->u.begin->u.block.x); break;
468 
                case Defpoint: src = cp->u.point.src; break;
469 
                case Gen: case Jump:
470 
                case Label:    if (prunetemps)
471 
                                cp->u.forest = prune(cp->u.forest);
472 
                               fixup(cp->u.forest);
473 
                               cp->u.forest = (*IR->gen)(cp->u.forest); break;
474 
                case Local:    (*IR->local)(cp->u.var); break;
475 
                case Switch:   break;
476 
                default: assert(0);
477 
                }
478 
        src = save;
479 
}
480 
static void fixup(Node p) {
481 
        for ( ; p; p = p->link)
482 
                switch (generic(p->op)) {
483 
                case JUMP:
484 
                        if (specific(p->kids[0]->op) == ADDRG+P)
485 
                                p->kids[0]->syms[0] =
486 
                                        equated(p->kids[0]->syms[0]);
487 
                        break;
488 
                case LABEL: assert(p->syms[0] == equated(p->syms[0])); break;
489 
                case EQ: case GE: case GT: case LE: case LT: case NE:
490 
                        assert(p->syms[0]);
491 
                        p->syms[0] = equated(p->syms[0]);
492 
                }
493 
}
494 
static Symbol equated(Symbol p) {
495 
        { Symbol q; for (q = p->u.l.equatedto; q; q = q->u.l.equatedto) assert(p != q); }
496 
        while (p->u.l.equatedto)
497 
                p = p->u.l.equatedto;
498 
        return p;
499 
}
500 
void emitcode(void) {
501 
        Code cp;
502 
        Coordinate save;
503 
 
504 
        save = src;
505 
        cp = codehead.next;
506 
        for ( ; errcnt <= 0 && cp; cp = cp->next)
507 
                switch (cp->kind) {
508 
                case Address: break;
509 
                case Blockbeg: if (glevel && IR->stabblock) {
510 
                                (*IR->stabblock)('{',  cp->u.block.level - LOCAL, cp->u.block.locals);
511 
                                swtoseg(CODE);
512 
                               }
513 
 break;
514 
                case Blockend: if (glevel && IR->stabblock) {
515 
                                Code bp = cp->u.begin;
516 
                                foreach(bp->u.block.identifiers, bp->u.block.level, typestab, NULL);
517 
                                foreach(bp->u.block.types,       bp->u.block.level, typestab, NULL);
518 
                                (*IR->stabblock)('}', bp->u.block.level - LOCAL, bp->u.block.locals);
519 
                                swtoseg(CODE);
520 
                               }
521 
 break;
522 
                case Defpoint: src = cp->u.point.src;
523 
                               if (glevel > 0 && IR->stabline) {
524 
                                (*IR->stabline)(&cp->u.point.src); swtoseg(CODE); } break;
525 
                case Gen: case Jump:
526 
                case Label:    if (cp->u.forest)
527 
                                (*IR->emit)(cp->u.forest); break;
528 
                case Local:    if (glevel && IR->stabsym) {
529 
                                (*IR->stabsym)(cp->u.var);
530 
                                swtoseg(CODE);
531 
                               } break;
532 
                case Switch:   {        int i;
533 
                                defglobal(cp->u.swtch.table, LIT);
534 
                                (*IR->defaddress)(equated(cp->u.swtch.labels[0]));
535 
                                for (i = 1; i < cp->u.swtch.size; i++) {
536 
                                        long k = cp->u.swtch.values[i-1];
537 
                                        while (++k < cp->u.swtch.values[i])
538 
                                                assert(k < LONG_MAX),
539 
                                                (*IR->defaddress)(equated(cp->u.swtch.deflab));
540 
                                        (*IR->defaddress)(equated(cp->u.swtch.labels[i]));
541 
                                }
542 
                                swtoseg(CODE);
543 
                               } break;
544 
                default: assert(0);
545 
                }
546 
        src = save;
547 
}
548 
 
549 
static Node undag(Node forest) {
550 
        Node p;
551 
 
552 
        tail = &forest;
553 
        for (p = forest; p; p = p->link)
554 
                if (generic(p->op) == INDIR) {
555 
                        assert(p->count >= 1);
556 
                        visit(p, 1);
557 
                        if (p->syms[2]) {
558 
                                assert(p->syms[2]->u.t.cse);
559 
                                p->syms[2]->u.t.cse = NULL;
560 
                                addlocal(p->syms[2]);
561 
                        }
562 
                } else if (iscall(p->op) && p->count >= 1)
563 
                        visit(p, 1);
564 
                else {
565 
                        assert(p->count == 0),
566 
                        visit(p, 1);
567 
                        *tail = p;
568 
                        tail = &p->link;
569 
                }
570 
        *tail = NULL;
571 
        return forest;
572 
}
573 
static Node replace(Node p) {
574 
        if (p && (  generic(p->op) == INDIR
575 
                 && generic(p->kids[0]->op) == ADDRL
576 
                 && p->kids[0]->syms[0]->temporary
577 
                 && p->kids[0]->syms[0]->u.t.replace)) {
578 
                p = p->kids[0]->syms[0]->u.t.cse;
579 
                if (generic(p->op) == INDIR && isaddrop(p->kids[0]->op))
580 
                        p = newnode(p->op, newnode(p->kids[0]->op, NULL, NULL,
581 
                                p->kids[0]->syms[0]), NULL, NULL);
582 
                else if (generic(p->op) == ADDRG)
583 
                        p = newnode(p->op, NULL, NULL, p->syms[0]);
584 
                else
585 
                        assert(0);
586 
                p->count = 1;
587 
        } else if (p) {
588 
                p->kids[0] = replace(p->kids[0]);
589 
                p->kids[1] = replace(p->kids[1]);
590 
        }
591 
        return p;
592 
}
593 
static Node prune(Node forest) {
594 
        Node p, *tail = &forest;
595 
        int count = 0;
596 
 
597 
        for (p = forest; p; p = p->link) {
598 
                if (count > 0) {
599 
                        p->kids[0] = replace(p->kids[0]);
600 
                        p->kids[1] = replace(p->kids[1]);
601 
                }
602 
                if ((  generic(p->op) == ASGN
603 
                    && generic(p->kids[0]->op) == ADDRL
604 
                    && p->kids[0]->syms[0]->temporary
605 
                    && p->kids[0]->syms[0]->u.t.cse == p->kids[1])) {
606 
                        Symbol tmp = p->kids[0]->syms[0];
607 
                        if (!tmp->defined)
608 
                                (*IR->local)(tmp);
609 
                        tmp->defined = 1;
610 
                        if ((  generic(p->kids[1]->op) == INDIR
611 
                            && isaddrop(p->kids[1]->kids[0]->op)
612 
                            && p->kids[1]->kids[0]->syms[0]->sclass == REGISTER)
613 
                        || ((  generic(p->kids[1]->op) == INDIR
614 
                            && isaddrop(p->kids[1]->kids[0]->op)) && tmp->sclass == AUTO)
615 
                        || (generic(p->kids[1]->op) == ADDRG && tmp->sclass == AUTO)) {
616 
                                tmp->u.t.replace = 1;
617 
                                count++;
618 
                                continue;       /* and omit the assignment */
619 
                        }
620 
                }
621 
                /* keep the assignment and other roots */
622 
                *tail = p;
623 
                tail = &(*tail)->link;
624 
        }
625 
        assert(*tail == NULL);
626 
        return forest;
627 
}
628 
static Node visit(Node p, int listed) {
629 
        if (p)
630 
                if (p->syms[2])
631 
                        p = tmpnode(p);
632 
                else if (p->count <= 1 && !iscall(p->op)
633 
                ||       p->count == 0 &&  iscall(p->op)) {
634 
                        p->kids[0] = visit(p->kids[0], 0);
635 
                        p->kids[1] = visit(p->kids[1], 0);
636 
                }
637 
 
638 
                else if (specific(p->op) == ADDRL+P || specific(p->op) == ADDRF+P) {
639 
                        assert(!listed);
640 
                        p = newnode(p->op, NULL, NULL, p->syms[0]);
641 
                        p->count = 1;
642 
                }
643 
                else if (p->op == INDIR+B) {
644 
                        p = newnode(p->op, p->kids[0], NULL, NULL);
645 
                        p->count = 1;
646 
                        p->kids[0] = visit(p->kids[0], 0);
647 
                        p->kids[1] = visit(p->kids[1], 0);
648 
                }
649 
                else {
650 
                        p->kids[0] = visit(p->kids[0], 0);
651 
                        p->kids[1] = visit(p->kids[1], 0);
652 
                        p->syms[2] = temporary(REGISTER, btot(p->op, opsize(p->op)));
653 
                        assert(!p->syms[2]->defined);
654 
                        p->syms[2]->ref = 1;
655 
                        p->syms[2]->u.t.cse = p;
656 
 
657 
                        *tail = asgnnode(p->syms[2], p);
658 
                        tail = &(*tail)->link;
659 
                        if (!listed)
660 
                                p = tmpnode(p);
661 
                };
662 
        return p;
663 
}
664 
static Node tmpnode(Node p) {
665 
        Symbol tmp = p->syms[2];
666 
 
667 
        assert(tmp);
668 
        if (--p->count == 0)
669 
                p->syms[2] = NULL;
670 
        p = newnode(INDIR + ttob(tmp->type),
671 
                newnode(ADDRL + ttob(voidptype), NULL, NULL, tmp), NULL, NULL);
672 
        p->count = 1;
673 
        return p;
674 
}
675 
static Node asgnnode(Symbol tmp, Node p) {
676 
        p = newnode(ASGN + ttob(tmp->type),
677 
                newnode(ADDRL + ttob(voidptype), NULL, NULL, tmp), p, NULL);
678 
        p->syms[0] = intconst(tmp->type->size);
679 
        p->syms[1] = intconst(tmp->type->align);
680 
        return p;
681 
}
682 
/* printdag - print dag p on fd, or the node list if p == 0 */
683 
void printdag(Node p, int fd) {
684 
        FILE *f = fd == 1 ? stdout : stderr;
685 
 
686 
        printed(0);
687 
        if (p == 0) {
688 
                if ((p = forest) != NULL)
689 
                        do {
690 
                                p = p->link;
691 
                                printdag1(p, fd, 0);
692 
                        } while (p != forest);
693 
        } else if (*printed(nodeid((Tree)p)))
694 
                fprint(f, "node'%d printed above\n", nodeid((Tree)p));
695 
        else
696 
                printdag1(p, fd, 0);
697 
}
698 
 
699 
/* printdag1 - recursively print dag p */
700 
static void printdag1(Node p, int fd, int lev) {
701 
        int id, i;
702 
 
703 
        if (p == 0 || *printed(id = nodeid((Tree)p)))
704 
                return;
705 
        *printed(id) = 1;
706 
        for (i = 0; i < NELEMS(p->kids); i++)
707 
                printdag1(p->kids[i], fd, lev + 1);
708 
        printnode(p, fd, lev);
709 
}
710 
 
711 
/* printnode - print fields of dag p */
712 
static void printnode(Node p, int fd, int lev) {
713 
        if (p) {
714 
                FILE *f = fd == 1 ? stdout : stderr;
715 
                int i, id = nodeid((Tree)p);
716 
                fprint(f, "%c%d%s", lev == 0 ? '\'' : '#', id,
717 
                        &"   "[id < 10 ? 0 : id < 100 ? 1 : 2]);
718 
                fprint(f, "%s count=%d", opname(p->op), p->count);
719 
                for (i = 0; i < NELEMS(p->kids) && p->kids[i]; i++)
720 
                        fprint(f, " #%d", nodeid((Tree)p->kids[i]));
721 
                if (generic(p->op) == CALL && p->syms[0] && p->syms[0]->type)
722 
                        fprint(f, " {%t}", p->syms[0]->type);
723 
                else
724 
                        for (i = 0; i < NELEMS(p->syms) && p->syms[i]; i++)
725 
                                if (p->syms[i]->name)
726 
                                        fprint(f, " %s", p->syms[i]->name);
727 
                                else
728 
                                        fprint(f, " %p", p->syms[i]);
729 
                fprint(f, "\n");
730 
        }
731 
}
732 
 
733 
/* typestab - emit stab entries for p */
734 
static void typestab(Symbol p, void *cl) {
735 
        if (!isfunc(p->type) && (p->sclass == EXTERN || p->sclass == STATIC) && IR->stabsym)
736 
                (*IR->stabsym)(p);
737 
        else if ((p->sclass == TYPEDEF || p->sclass == 0) && IR->stabtype)
738 
                (*IR->stabtype)(p);
739 
}
740 
 

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