ir.c

   1 /*
   2  * Copyright (C) 2012
   3  *     Wolfgang Bumiller
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a copy of
   6  * this software and associated documentation files (the "Software"), to deal in
   7  * the Software without restriction, including without limitation the rights to
   8  * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
   9  * of the Software, and to permit persons to whom the Software is furnished to do
  10  * so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in all
  13  * copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  */
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include "gmqcc.h"
  26 #include "ir.h"
  27
  28 /***********************************************************************
  29  *IR Builder
  30  */
  31
  32 ir_builder* ir_builder_new(const char *modulename)
  33 {
  34     ir_builder* self;
  35
  36     self = (ir_builder*)mem_a(sizeof(*self));
  37     MEM_VECTOR_INIT(self, functions);
  38     MEM_VECTOR_INIT(self, globals);
  39     self->name = NULL;
  40     if (!ir_builder_set_name(self, modulename)) {
  41         mem_d(self);
  42         return NULL;
  43     }
  44
  45     /* globals which always exist */
  46
  47     /* for now we give it a vector size */
  48     ir_builder_create_global(self, "OFS_RETURN", TYPE_VARIANT);
  49
  50     return self;
  51 }
  52
  53 MEM_VEC_FUNCTIONS(ir_builder, ir_value*, globals)
  54 MEM_VEC_FUNCTIONS(ir_builder, ir_function*, functions)
  55
  56 void ir_builder_delete(ir_builder* self)
  57 {
  58     size_t i;
  59     mem_d((void*)self->name);
  60     for (i = 0; i != self->functions_count; ++i) {
  61         ir_function_delete(self->functions[i]);
  62     }
  63     MEM_VECTOR_CLEAR(self, functions);
  64     for (i = 0; i != self->globals_count; ++i) {
  65         ir_value_delete(self->globals[i]);
  66     }
  67     MEM_VECTOR_CLEAR(self, globals);
  68     mem_d(self);
  69 }
  70
  71 bool ir_builder_set_name(ir_builder *self, const char *name)
  72 {
  73     if (self->name)
  74         mem_d((void*)self->name);
  75     self->name = util_strdup(name);
  76     return !!self->name;
  77 }
  78
  79 ir_function* ir_builder_get_function(ir_builder *self, const char *name)
  80 {
  81     size_t i;
  82     for (i = 0; i < self->functions_count; ++i) {
  83         if (!strcmp(name, self->functions[i]->name))
  84             return self->functions[i];
  85     }
  86     return NULL;
  87 }
  88
  89 ir_function* ir_builder_create_function(ir_builder *self, const char *name)
  90 {
  91     ir_function *fn = ir_builder_get_function(self, name);
  92     if (fn) {
  93         return NULL;
  94     }
  95
  96     fn = ir_function_new(self);
  97     if (!ir_function_set_name(fn, name) ||
  98         !ir_builder_functions_add(self, fn) )
  99     {
 100         ir_function_delete(fn);
 101         return NULL;
 102     }
 103     return fn;
 104 }
 105
 106 ir_value* ir_builder_get_global(ir_builder *self, const char *name)
 107 {
 108     size_t i;
 109     for (i = 0; i < self->globals_count; ++i) {
 110         if (!strcmp(self->globals[i]->name, name))
 111             return self->globals[i];
 112     }
 113     return NULL;
 114 }
 115
 116 ir_value* ir_builder_create_global(ir_builder *self, const char *name, int vtype)
 117 {
 118     ir_value *ve = ir_builder_get_global(self, name);
 119     if (ve) {
 120         return NULL;
 121     }
 122
 123     ve = ir_value_var(name, store_global, vtype);
 124     if (!ir_builder_globals_add(self, ve)) {
 125         ir_value_delete(ve);
 126         return NULL;
 127     }
 128     return ve;
 129 }
 130
 131 /***********************************************************************
 132  *IR Function
 133  */
 134
 135 bool ir_function_naive_phi(ir_function*);
 136 void ir_function_enumerate(ir_function*);
 137 bool ir_function_calculate_liferanges(ir_function*);
 138
 139 ir_function* ir_function_new(ir_builder* owner)
 140 {
 141     ir_function *self;
 142     self = (ir_function*)mem_a(sizeof(*self));
 143     self->name = NULL;
 144     if (!ir_function_set_name(self, "<@unnamed>")) {
 145         mem_d(self);
 146         return NULL;
 147     }
 148     self->owner = owner;
 149     self->context.file = "<@no context>";
 150     self->context.line = 0;
 151     self->retype = TYPE_VOID;
 152     MEM_VECTOR_INIT(self, params);
 153     MEM_VECTOR_INIT(self, blocks);
 154     MEM_VECTOR_INIT(self, values);
 155     MEM_VECTOR_INIT(self, locals);
 156
 157     self->run_id = 0;
 158     return self;
 159 }
 160 MEM_VEC_FUNCTIONS(ir_function, ir_value*, values)
 161 MEM_VEC_FUNCTIONS(ir_function, ir_block*, blocks)
 162 MEM_VEC_FUNCTIONS(ir_function, ir_value*, locals)
 163
 164 bool ir_function_set_name(ir_function *self, const char *name)
 165 {
 166     if (self->name)
 167         mem_d((void*)self->name);
 168     self->name = util_strdup(name);
 169     return !!self->name;
 170 }
 171
 172 void ir_function_delete(ir_function *self)
 173 {
 174     size_t i;
 175     mem_d((void*)self->name);
 176
 177     for (i = 0; i != self->blocks_count; ++i)
 178         ir_block_delete(self->blocks[i]);
 179     MEM_VECTOR_CLEAR(self, blocks);
 180
 181     MEM_VECTOR_CLEAR(self, params);
 182
 183     for (i = 0; i != self->values_count; ++i)
 184         ir_value_delete(self->values[i]);
 185     MEM_VECTOR_CLEAR(self, values);
 186
 187     for (i = 0; i != self->locals_count; ++i)
 188         ir_value_delete(self->locals[i]);
 189     MEM_VECTOR_CLEAR(self, locals);
 190
 191     mem_d(self);
 192 }
 193
 194 bool GMQCC_WARN ir_function_collect_value(ir_function *self, ir_value *v)
 195 {
 196     return ir_function_values_add(self, v);
 197 }
 198
 199 ir_block* ir_function_create_block(ir_function *self, const char *label)
 200 {
 201     ir_block* bn = ir_block_new(self, label);
 202     memcpy(&bn->context, &self->context, sizeof(self->context));
 203     if (!ir_function_blocks_add(self, bn)) {
 204         ir_block_delete(bn);
 205         return NULL;
 206     }
 207     return bn;
 208 }
 209
 210 bool ir_function_finalize(ir_function *self)
 211 {
 212     if (!ir_function_naive_phi(self))
 213         return false;
 214
 215     ir_function_enumerate(self);
 216
 217     if (!ir_function_calculate_liferanges(self))
 218         return false;
 219     return true;
 220 }
 221
 222 ir_value* ir_function_get_local(ir_function *self, const char *name)
 223 {
 224     size_t i;
 225     for (i = 0; i < self->locals_count; ++i) {
 226         if (!strcmp(self->locals[i]->name, name))
 227             return self->locals[i];
 228     }
 229     return NULL;
 230 }
 231
 232 ir_value* ir_function_create_local(ir_function *self, const char *name, int vtype)
 233 {
 234     ir_value *ve = ir_function_get_local(self, name);
 235     if (ve) {
 236         return NULL;
 237     }
 238
 239     ve = ir_value_var(name, store_local, vtype);
 240     if (!ir_function_locals_add(self, ve)) {
 241         ir_value_delete(ve);
 242         return NULL;
 243     }
 244     return ve;
 245 }
 246
 247 /***********************************************************************
 248  *IR Block
 249  */
 250
 251 ir_block* ir_block_new(ir_function* owner, const char *name)
 252 {
 253     ir_block *self;
 254     self = (ir_block*)mem_a(sizeof(*self));
 255     self->label = NULL;
 256     if (!ir_block_set_label(self, name)) {
 257         mem_d(self);
 258         return NULL;
 259     }
 260     self->owner = owner;
 261     self->context.file = "<@no context>";
 262     self->context.line = 0;
 263     self->final = false;
 264     MEM_VECTOR_INIT(self, instr);
 265     MEM_VECTOR_INIT(self, entries);
 266     MEM_VECTOR_INIT(self, exits);
 267
 268     self->eid = 0;
 269     self->is_return = false;
 270     self->run_id = 0;
 271     MEM_VECTOR_INIT(self, living);
 272     return self;
 273 }
 274 MEM_VEC_FUNCTIONS(ir_block, ir_instr*, instr)
 275 MEM_VEC_FUNCTIONS_ALL(ir_block, ir_block*, entries)
 276 MEM_VEC_FUNCTIONS_ALL(ir_block, ir_block*, exits)
 277 MEM_VEC_FUNCTIONS_ALL(ir_block, ir_value*, living)
 278
 279 void ir_block_delete(ir_block* self)
 280 {
 281     size_t i;
 282     mem_d(self->label);
 283     for (i = 0; i != self->instr_count; ++i)
 284         ir_instr_delete(self->instr[i]);
 285     MEM_VECTOR_CLEAR(self, instr);
 286     MEM_VECTOR_CLEAR(self, entries);
 287     MEM_VECTOR_CLEAR(self, exits);
 288     MEM_VECTOR_CLEAR(self, living);
 289     mem_d(self);
 290 }
 291
 292 bool ir_block_set_label(ir_block *self, const char *name)
 293 {
 294     if (self->label)
 295         mem_d((void*)self->label);
 296     self->label = util_strdup(name);
 297     return !!self->label;
 298 }
 299
 300 /***********************************************************************
 301  *IR Instructions
 302  */
 303
 304 ir_instr* ir_instr_new(ir_block* owner, int op)
 305 {
 306     ir_instr *self;
 307     self = (ir_instr*)mem_a(sizeof(*self));
 308     self->owner = owner;
 309     self->context.file = "<@no context>";
 310     self->context.line = 0;
 311     self->opcode = op;
 312     self->_ops[0] = NULL;
 313     self->_ops[1] = NULL;
 314     self->_ops[2] = NULL;
 315     self->bops[0] = NULL;
 316     self->bops[1] = NULL;
 317     MEM_VECTOR_INIT(self, phi);
 318
 319     self->eid = 0;
 320     return self;
 321 }
 322 MEM_VEC_FUNCTIONS(ir_instr, ir_phi_entry_t, phi)
 323
 324 void ir_instr_delete(ir_instr *self)
 325 {
 326     size_t i;
 327     /* The following calls can only delete from
 328      * vectors, we still want to delete this instruction
 329      * so ignore the return value. Since with the warn_unused_result attribute
 330      * gcc doesn't care about an explicit: (void)foo(); to ignore the result,
 331      * I have to improvise here and use if(foo());
 332      */
 333     for (i = 0; i < self->phi_count; ++i) {
 334         size_t idx;
 335         if (ir_value_writes_find(self->phi[i].value, self, &idx))
 336             if (ir_value_writes_remove(self->phi[i].value, idx)) GMQCC_SUPRESS_EMPTY_BODY;
 337         if (ir_value_reads_find(self->phi[i].value, self, &idx))
 338             if (ir_value_reads_remove (self->phi[i].value, idx)) GMQCC_SUPRESS_EMPTY_BODY;
 339     }
 340     MEM_VECTOR_CLEAR(self, phi);
 341     if (ir_instr_op(self, 0, NULL, false)) GMQCC_SUPRESS_EMPTY_BODY;
 342     if (ir_instr_op(self, 1, NULL, false)) GMQCC_SUPRESS_EMPTY_BODY;
 343     if (ir_instr_op(self, 2, NULL, false)) GMQCC_SUPRESS_EMPTY_BODY;
 344     mem_d(self);
 345 }
 346
 347 bool ir_instr_op(ir_instr *self, int op, ir_value *v, bool writing)
 348 {
 349     if (self->_ops[op]) {
 350         size_t idx;
 351         if (writing && ir_value_writes_find(self->_ops[op], self, &idx))
 352         {
 353             if (!ir_value_writes_remove(self->_ops[op], idx))
 354                 return false;
 355         }
 356         else if (ir_value_reads_find(self->_ops[op], self, &idx))
 357         {
 358             if (!ir_value_reads_remove(self->_ops[op], idx))
 359                 return false;
 360         }
 361     }
 362     if (v) {
 363         if (writing) {
 364             if (!ir_value_writes_add(v, self))
 365                 return false;
 366         } else {
 367             if (!ir_value_reads_add(v, self))
 368                 return false;
 369         }
 370     }
 371     self->_ops[op] = v;
 372     return true;
 373 }
 374
 375 /***********************************************************************
 376  *IR Value
 377  */
 378
 379 ir_value* ir_value_var(const char *name, int storetype, int vtype)
 380 {
 381     ir_value *self;
 382     self = (ir_value*)mem_a(sizeof(*self));
 383     self->vtype = vtype;
 384     self->store = storetype;
 385     MEM_VECTOR_INIT(self, reads);
 386     MEM_VECTOR_INIT(self, writes);
 387     self->isconst = false;
 388     self->context.file = "<@no context>";
 389     self->context.line = 0;
 390     self->name = NULL;
 391     ir_value_set_name(self, name);
 392
 393     MEM_VECTOR_INIT(self, life);
 394     return self;
 395 }
 396 MEM_VEC_FUNCTIONS(ir_value, ir_life_entry_t, life)
 397 MEM_VEC_FUNCTIONS_ALL(ir_value, ir_instr*, reads)
 398 MEM_VEC_FUNCTIONS_ALL(ir_value, ir_instr*, writes)
 399
 400 ir_value* ir_value_out(ir_function *owner, const char *name, int storetype, int vtype)
 401 {
 402     ir_value *v = ir_value_var(name, storetype, vtype);
 403     if (!v)
 404         return NULL;
 405     if (!ir_function_collect_value(owner, v))
 406     {
 407         ir_value_delete(v);
 408         return NULL;
 409     }
 410     return v;
 411 }
 412
 413 void ir_value_delete(ir_value* self)
 414 {
 415     mem_d((void*)self->name);
 416     if (self->isconst)
 417     {
 418         if (self->vtype == TYPE_STRING)
 419             mem_d((void*)self->constval.vstring);
 420     }
 421     MEM_VECTOR_CLEAR(self, reads);
 422     MEM_VECTOR_CLEAR(self, writes);
 423     MEM_VECTOR_CLEAR(self, life);
 424     mem_d(self);
 425 }
 426
 427 void ir_value_set_name(ir_value *self, const char *name)
 428 {
 429     if (self->name)
 430         mem_d((void*)self->name);
 431     self->name = util_strdup(name);
 432 }
 433
 434 bool ir_value_set_float(ir_value *self, float f)
 435 {
 436     if (self->vtype != TYPE_FLOAT)
 437         return false;
 438     self->constval.vfloat = f;
 439     self->isconst = true;
 440     return true;
 441 }
 442
 443 bool ir_value_set_vector(ir_value *self, vector v)
 444 {
 445     if (self->vtype != TYPE_VECTOR)
 446         return false;
 447     self->constval.vvec = v;
 448     self->isconst = true;
 449     return true;
 450 }
 451
 452 bool ir_value_set_string(ir_value *self, const char *str)
 453 {
 454     if (self->vtype != TYPE_STRING)
 455         return false;
 456     self->constval.vstring = util_strdup(str);
 457     self->isconst = true;
 458     return true;
 459 }
 460
 461 #if 0
 462 bool ir_value_set_int(ir_value *self, int i)
 463 {
 464     if (self->vtype != TYPE_INTEGER)
 465         return false;
 466     self->constval.vint = i;
 467     self->isconst = true;
 468     return true;
 469 }
 470 #endif
 471
 472 bool ir_value_lives(ir_value *self, size_t at)
 473 {
 474     size_t i;
 475     for (i = 0; i < self->life_count; ++i)
 476     {
 477         ir_life_entry_t *life = &self->life[i];
 478         if (life->start <= at && at <= life->end)
 479             return true;
 480         if (life->start > at) /* since it's ordered */
 481             return false;
 482     }
 483     return false;
 484 }
 485
 486 bool ir_value_life_insert(ir_value *self, size_t idx, ir_life_entry_t e)
 487 {
 488     size_t k;
 489     if (!ir_value_life_add(self, e)) /* naive... */
 490         return false;
 491     for (k = self->life_count-1; k > idx; --k)
 492         self->life[k] = self->life[k-1];
 493     self->life[idx] = e;
 494     return true;
 495 }
 496
 497 bool ir_value_life_merge(ir_value *self, size_t s)
 498 {
 499     size_t i;
 500     ir_life_entry_t *life = NULL;
 501     ir_life_entry_t *before = NULL;
 502     ir_life_entry_t new_entry;
 503
 504     /* Find the first range >= s */
 505     for (i = 0; i < self->life_count; ++i)
 506     {
 507         before = life;
 508         life = &self->life[i];
 509         if (life->start > s)
 510             break;
 511     }
 512     /* nothing found? append */
 513     if (i == self->life_count) {
 514         ir_life_entry_t e;
 515         if (life && life->end+1 == s)
 516         {
 517             /* previous life range can be merged in */
 518             life->end++;
 519             return true;
 520         }
 521         if (life && life->end >= s)
 522             return false;
 523         e.start = e.end = s;
 524         if (!ir_value_life_add(self, e))
 525             return false; /* failing */
 526         return true;
 527     }
 528     /* found */
 529     if (before)
 530     {
 531         if (before->end + 1 == s &&
 532             life->start - 1 == s)
 533         {
 534             /* merge */
 535             before->end = life->end;
 536             if (!ir_value_life_remove(self, i))
 537                 return false; /* failing */
 538             return true;
 539         }
 540         if (before->end + 1 == s)
 541         {
 542             /* extend before */
 543             before->end++;
 544             return true;
 545         }
 546         /* already contained */
 547         if (before->end >= s)
 548             return false;
 549     }
 550     /* extend */
 551     if (life->start - 1 == s)
 552     {
 553         life->start--;
 554         return true;
 555     }
 556     /* insert a new entry */
 557     new_entry.start = new_entry.end = s;
 558     return ir_value_life_insert(self, i, new_entry);
 559 }
 560
 561 /***********************************************************************
 562  *IR main operations
 563  */
 564
 565 bool ir_block_create_store_op(ir_block *self, int op, ir_value *target, ir_value *what)
 566 {
 567     if (target->store == store_value) {
 568         fprintf(stderr, "cannot store to an SSA value\n");
 569         return false;
 570     } else {
 571         ir_instr *in = ir_instr_new(self, op);
 572         if (!in)
 573             return false;
 574         if (!ir_instr_op(in, 0, target, true) ||
 575             !ir_instr_op(in, 1, what, false)  ||
 576             !ir_block_instr_add(self, in) )
 577         {
 578             return false;
 579         }
 580         return true;
 581     }
 582 }
 583
 584 bool ir_block_create_store(ir_block *self, ir_value *target, ir_value *what)
 585 {
 586     int op = 0;
 587     int vtype;
 588     if (target->vtype == TYPE_VARIANT)
 589         vtype = what->vtype;
 590     else
 591         vtype = target->vtype;
 592
 593     switch (vtype) {
 594         case TYPE_FLOAT:
 595 #if 0
 596             if (what->vtype == TYPE_INTEGER)
 597                 op = INSTR_CONV_ITOF;
 598             else
 599 #endif
 600                 op = INSTR_STORE_F;
 601             break;
 602         case TYPE_VECTOR:
 603             op = INSTR_STORE_V;
 604             break;
 605         case TYPE_ENTITY:
 606             op = INSTR_STORE_ENT;
 607             break;
 608         case TYPE_STRING:
 609             op = INSTR_STORE_S;
 610             break;
 611         case TYPE_FIELD:
 612             op = INSTR_STORE_FLD;
 613             break;
 614 #if 0
 615         case TYPE_INTEGER:
 616             if (what->vtype == TYPE_INTEGER)
 617                 op = INSTR_CONV_FTOI;
 618             else
 619                 op = INSTR_STORE_I;
 620             break;
 621 #endif
 622         case TYPE_POINTER:
 623 #if 0
 624             op = INSTR_STORE_I;
 625 #else
 626             op = INSTR_STORE_ENT;
 627 #endif
 628             break;
 629         default:
 630             /* Unknown type */
 631             return false;
 632     }
 633     return ir_block_create_store_op(self, op, target, what);
 634 }
 635
 636 bool ir_block_create_storep(ir_block *self, ir_value *target, ir_value *what)
 637 {
 638     int op = 0;
 639     int vtype;
 640
 641     if (target->vtype != TYPE_POINTER)
 642         return false;
 643
 644     /* storing using pointer - target is a pointer, type must be
 645      * inferred from source
 646      */
 647     vtype = what->vtype;
 648
 649     switch (vtype) {
 650         case TYPE_FLOAT:
 651             op = INSTR_STOREP_F;
 652             break;
 653         case TYPE_VECTOR:
 654             op = INSTR_STOREP_V;
 655             break;
 656         case TYPE_ENTITY:
 657             op = INSTR_STOREP_ENT;
 658             break;
 659         case TYPE_STRING:
 660             op = INSTR_STOREP_S;
 661             break;
 662         case TYPE_FIELD:
 663             op = INSTR_STOREP_FLD;
 664             break;
 665 #if 0
 666         case TYPE_INTEGER:
 667             op = INSTR_STOREP_I;
 668             break;
 669 #endif
 670         case TYPE_POINTER:
 671 #if 0
 672             op = INSTR_STOREP_I;
 673 #else
 674             op = INSTR_STOREP_ENT;
 675 #endif
 676             break;
 677         default:
 678             /* Unknown type */
 679             return false;
 680     }
 681     return ir_block_create_store_op(self, op, target, what);
 682 }
 683
 684 bool ir_block_create_return(ir_block *self, ir_value *v)
 685 {
 686     ir_instr *in;
 687     if (self->final) {
 688         fprintf(stderr, "block already ended (%s)\n", self->label);
 689         return false;
 690     }
 691     self->final = true;
 692     self->is_return = true;
 693     in = ir_instr_new(self, INSTR_RETURN);
 694     if (!in)
 695         return false;
 696
 697     if (!ir_instr_op(in, 0, v, false) ||
 698         !ir_block_instr_add(self, in) )
 699     {
 700         return false;
 701     }
 702     return true;
 703 }
 704
 705 bool ir_block_create_if(ir_block *self, ir_value *v,
 706                         ir_block *ontrue, ir_block *onfalse)
 707 {
 708     ir_instr *in;
 709     if (self->final) {
 710         fprintf(stderr, "block already ended (%s)\n", self->label);
 711         return false;
 712     }
 713     self->final = true;
 714     /*in = ir_instr_new(self, (v->vtype == TYPE_STRING ? INSTR_IF_S : INSTR_IF_F));*/
 715     in = ir_instr_new(self, VINSTR_COND);
 716     if (!in)
 717         return false;
 718
 719     if (!ir_instr_op(in, 0, v, false)) {
 720         ir_instr_delete(in);
 721         return false;
 722     }
 723
 724     in->bops[0] = ontrue;
 725     in->bops[1] = onfalse;
 726
 727     if (!ir_block_instr_add(self, in))
 728         return false;
 729
 730     if (!ir_block_exits_add(self, ontrue)    ||
 731         !ir_block_exits_add(self, onfalse)   ||
 732         !ir_block_entries_add(ontrue, self)  ||
 733         !ir_block_entries_add(onfalse, self) )
 734     {
 735         return false;
 736     }
 737     return true;
 738 }
 739
 740 bool ir_block_create_jump(ir_block *self, ir_block *to)
 741 {
 742     ir_instr *in;
 743     if (self->final) {
 744         fprintf(stderr, "block already ended (%s)\n", self->label);
 745         return false;
 746     }
 747     self->final = true;
 748     in = ir_instr_new(self, VINSTR_JUMP);
 749     if (!in)
 750         return false;
 751
 752     in->bops[0] = to;
 753     if (!ir_block_instr_add(self, in))
 754         return false;
 755
 756     if (!ir_block_exits_add(self, to) ||
 757         !ir_block_entries_add(to, self) )
 758     {
 759         return false;
 760     }
 761     return true;
 762 }
 763
 764 bool ir_block_create_goto(ir_block *self, ir_block *to)
 765 {
 766     ir_instr *in;
 767     if (self->final) {
 768         fprintf(stderr, "block already ended (%s)\n", self->label);
 769         return false;
 770     }
 771     self->final = true;
 772     in = ir_instr_new(self, INSTR_GOTO);
 773     if (!in)
 774         return false;
 775
 776     in->bops[0] = to;
 777     if (!ir_block_instr_add(self, in))
 778         return false;
 779
 780     if (!ir_block_exits_add(self, to) ||
 781         !ir_block_entries_add(to, self) )
 782     {
 783         return false;
 784     }
 785     return true;
 786 }
 787
 788 ir_instr* ir_block_create_phi(ir_block *self, const char *label, int ot)
 789 {
 790     ir_value *out;
 791     ir_instr *in;
 792     in = ir_instr_new(self, VINSTR_PHI);
 793     if (!in)
 794         return NULL;
 795     out = ir_value_out(self->owner, label, store_local, ot);
 796     if (!out) {
 797         ir_instr_delete(in);
 798         return NULL;
 799     }
 800     if (!ir_instr_op(in, 0, out, true)) {
 801         ir_instr_delete(in);
 802         ir_value_delete(out);
 803         return NULL;
 804     }
 805     if (!ir_block_instr_add(self, in)) {
 806         ir_instr_delete(in);
 807         ir_value_delete(out);
 808         return NULL;
 809     }
 810     return in;
 811 }
 812
 813 ir_value* ir_phi_value(ir_instr *self)
 814 {
 815     return self->_ops[0];
 816 }
 817
 818 bool ir_phi_add(ir_instr* self, ir_block *b, ir_value *v)
 819 {
 820     ir_phi_entry_t pe;
 821
 822     if (!ir_block_entries_find(self->owner, b, NULL)) {
 823         /* Must not be possible to cause this, otherwise the AST
 824          * is doing something wrong.
 825          */
 826         fprintf(stderr, "Invalid entry block for PHI\n");
 827         abort();
 828     }
 829
 830     pe.value = v;
 831     pe.from = b;
 832     if (!ir_value_reads_add(v, self))
 833         return false;
 834     return ir_instr_phi_add(self, pe);
 835 }
 836
 837 /* binary op related code */
 838
 839 ir_value* ir_block_create_binop(ir_block *self,
 840                                 const char *label, int opcode,
 841                                 ir_value *left, ir_value *right)
 842 {
 843     ir_value *out = NULL;
 844     ir_instr *in  = NULL;
 845
 846     int ot = TYPE_VOID;
 847     switch (opcode) {
 848         case INSTR_ADD_F:
 849         case INSTR_SUB_F:
 850         case INSTR_DIV_F:
 851         case INSTR_MUL_F:
 852         case INSTR_MUL_V:
 853         case INSTR_AND:
 854         case INSTR_OR:
 855 #if 0
 856         case INSTR_AND_I:
 857         case INSTR_AND_IF:
 858         case INSTR_AND_FI:
 859         case INSTR_OR_I:
 860         case INSTR_OR_IF:
 861         case INSTR_OR_FI:
 862 #endif
 863         case INSTR_BITAND:
 864         case INSTR_BITOR:
 865 #if 0
 866         case INSTR_SUB_S: /* -- offset of string as float */
 867         case INSTR_MUL_IF:
 868         case INSTR_MUL_FI:
 869         case INSTR_DIV_IF:
 870         case INSTR_DIV_FI:
 871         case INSTR_BITOR_IF:
 872         case INSTR_BITOR_FI:
 873         case INSTR_BITAND_FI:
 874         case INSTR_BITAND_IF:
 875         case INSTR_EQ_I:
 876         case INSTR_NE_I:
 877 #endif
 878             ot = TYPE_FLOAT;
 879             break;
 880 #if 0
 881         case INSTR_ADD_I:
 882         case INSTR_ADD_IF:
 883         case INSTR_ADD_FI:
 884         case INSTR_SUB_I:
 885         case INSTR_SUB_FI:
 886         case INSTR_SUB_IF:
 887         case INSTR_MUL_I:
 888         case INSTR_DIV_I:
 889         case INSTR_BITAND_I:
 890         case INSTR_BITOR_I:
 891         case INSTR_XOR_I:
 892         case INSTR_RSHIFT_I:
 893         case INSTR_LSHIFT_I:
 894             ot = TYPE_INTEGER;
 895             break;
 896 #endif
 897         case INSTR_ADD_V:
 898         case INSTR_SUB_V:
 899         case INSTR_MUL_VF:
 900         case INSTR_MUL_FV:
 901 #if 0
 902         case INSTR_DIV_VF:
 903         case INSTR_MUL_IV:
 904         case INSTR_MUL_VI:
 905 #endif
 906             ot = TYPE_VECTOR;
 907             break;
 908 #if 0
 909         case INSTR_ADD_SF:
 910             ot = TYPE_POINTER;
 911             break;
 912 #endif
 913         default:
 914             /* ranges: */
 915             /* boolean operations result in floats */
 916             if (opcode >= INSTR_EQ_F && opcode <= INSTR_GT)
 917                 ot = TYPE_FLOAT;
 918             else if (opcode >= INSTR_LE && opcode <= INSTR_GT)
 919                 ot = TYPE_FLOAT;
 920 #if 0
 921             else if (opcode >= INSTR_LE_I && opcode <= INSTR_EQ_FI)
 922                 ot = TYPE_FLOAT;
 923 #endif
 924             break;
 925     };
 926     if (ot == TYPE_VOID) {
 927         /* The AST or parser were supposed to check this! */
 928         return NULL;
 929     }
 930
 931     out = ir_value_out(self->owner, label, store_local, ot);
 932     if (!out)
 933         return NULL;
 934
 935     in = ir_instr_new(self, opcode);
 936     if (!in) {
 937         ir_value_delete(out);
 938         return NULL;
 939     }
 940
 941     if (!ir_instr_op(in, 0, out, true) ||
 942         !ir_instr_op(in, 1, left, false) ||
 943         !ir_instr_op(in, 2, right, false) )
 944     {
 945         goto on_error;
 946     }
 947
 948     if (!ir_block_instr_add(self, in))
 949         goto on_error;
 950
 951     return out;
 952 on_error:
 953     ir_instr_delete(in);
 954     ir_value_delete(out);
 955     return NULL;
 956 }
 957
 958 ir_value* ir_block_create_load_from_ent(ir_block *self, const char *label, ir_value *ent, ir_value *field, int outype)
 959 {
 960     ir_instr *instr;
 961     ir_value *out;
 962     int       op;
 963
 964     if (ent->vtype != TYPE_ENTITY)
 965         return NULL;
 966
 967     switch (outype)
 968     {
 969         case TYPE_FLOAT:   op = INSTR_LOAD_F;   break;
 970         case TYPE_VECTOR:  op = INSTR_LOAD_V;   break;
 971         case TYPE_STRING:  op = INSTR_LOAD_S;   break;
 972         case TYPE_FIELD:   op = INSTR_LOAD_FLD; break;
 973         case TYPE_ENTITY:  op = INSTR_LOAD_ENT; break;
 974 #if 0
 975         case TYPE_POINTER: op = INSTR_LOAD_I; break;
 976         case TYPE_INTEGER: op = INSTR_LOAD_I; break;
 977 #endif
 978         default:
 979             return NULL;
 980     }
 981
 982     out = ir_value_out(self->owner, label, store_local, outype);
 983     if (!out)
 984         return NULL;
 985
 986     instr = ir_instr_new(self, op);
 987     if (!instr) {
 988         ir_value_delete(out);
 989         return NULL;
 990     }
 991
 992     if (!ir_instr_op(instr, 0, out, true) ||
 993         !ir_instr_op(instr, 0, ent, false) ||
 994         !ir_instr_op(instr, 0, field, false))
 995     {
 996         goto on_error;
 997     }
 998
 999     if (!ir_block_instr_add(self, instr))
1000         goto on_error;
1001
1002     return out;
1003 on_error:
1004     ir_instr_delete(instr);
1005     ir_value_delete(out);
1006     return NULL;
1007 }
1008
1009 ir_value* ir_block_create_add(ir_block *self,
1010                               const char *label,
1011                               ir_value *left, ir_value *right)
1012 {
1013     int op = 0;
1014     int l = left->vtype;
1015     int r = right->vtype;
1016     if (l == r) {
1017         switch (l) {
1018             default:
1019                 return NULL;
1020             case TYPE_FLOAT:
1021                 op = INSTR_ADD_F;
1022                 break;
1023 #if 0
1024             case TYPE_INTEGER:
1025                 op = INSTR_ADD_I;
1026                 break;
1027 #endif
1028             case TYPE_VECTOR:
1029                 op = INSTR_ADD_V;
1030                 break;
1031         }
1032     } else {
1033 #if 0
1034         if ( (l == TYPE_FLOAT && r == TYPE_INTEGER) )
1035             op = INSTR_ADD_FI;
1036         else if ( (l == TYPE_INTEGER && r == TYPE_FLOAT) )
1037             op = INSTR_ADD_IF;
1038         else
1039 #endif
1040             return NULL;
1041     }
1042     return ir_block_create_binop(self, label, op, left, right);
1043 }
1044
1045 ir_value* ir_block_create_sub(ir_block *self,
1046                               const char *label,
1047                               ir_value *left, ir_value *right)
1048 {
1049     int op = 0;
1050     int l = left->vtype;
1051     int r = right->vtype;
1052     if (l == r) {
1053
1054         switch (l) {
1055             default:
1056                 return NULL;
1057             case TYPE_FLOAT:
1058                 op = INSTR_SUB_F;
1059                 break;
1060 #if 0
1061             case TYPE_INTEGER:
1062                 op = INSTR_SUB_I;
1063                 break;
1064 #endif
1065             case TYPE_VECTOR:
1066                 op = INSTR_SUB_V;
1067                 break;
1068         }
1069     } else {
1070 #if 0
1071         if ( (l == TYPE_FLOAT && r == TYPE_INTEGER) )
1072             op = INSTR_SUB_FI;
1073         else if ( (l == TYPE_INTEGER && r == TYPE_FLOAT) )
1074             op = INSTR_SUB_IF;
1075         else
1076 #endif
1077             return NULL;
1078     }
1079     return ir_block_create_binop(self, label, op, left, right);
1080 }
1081
1082 ir_value* ir_block_create_mul(ir_block *self,
1083                               const char *label,
1084                               ir_value *left, ir_value *right)
1085 {
1086     int op = 0;
1087     int l = left->vtype;
1088     int r = right->vtype;
1089     if (l == r) {
1090
1091         switch (l) {
1092             default:
1093                 return NULL;
1094             case TYPE_FLOAT:
1095                 op = INSTR_MUL_F;
1096                 break;
1097 #if 0
1098             case TYPE_INTEGER:
1099                 op = INSTR_MUL_I;
1100                 break;
1101 #endif
1102             case TYPE_VECTOR:
1103                 op = INSTR_MUL_V;
1104                 break;
1105         }
1106     } else {
1107         if ( (l == TYPE_VECTOR && r == TYPE_FLOAT) )
1108             op = INSTR_MUL_VF;
1109         else if ( (l == TYPE_FLOAT && r == TYPE_VECTOR) )
1110             op = INSTR_MUL_FV;
1111 #if 0
1112         else if ( (l == TYPE_VECTOR && r == TYPE_INTEGER) )
1113             op = INSTR_MUL_VI;
1114         else if ( (l == TYPE_INTEGER && r == TYPE_VECTOR) )
1115             op = INSTR_MUL_IV;
1116         else if ( (l == TYPE_FLOAT && r == TYPE_INTEGER) )
1117             op = INSTR_MUL_FI;
1118         else if ( (l == TYPE_INTEGER && r == TYPE_FLOAT) )
1119             op = INSTR_MUL_IF;
1120 #endif
1121         else
1122             return NULL;
1123     }
1124     return ir_block_create_binop(self, label, op, left, right);
1125 }
1126
1127 ir_value* ir_block_create_div(ir_block *self,
1128                               const char *label,
1129                               ir_value *left, ir_value *right)
1130 {
1131     int op = 0;
1132     int l = left->vtype;
1133     int r = right->vtype;
1134     if (l == r) {
1135
1136         switch (l) {
1137             default:
1138                 return NULL;
1139             case TYPE_FLOAT:
1140                 op = INSTR_DIV_F;
1141                 break;
1142 #if 0
1143             case TYPE_INTEGER:
1144                 op = INSTR_DIV_I;
1145                 break;
1146 #endif
1147         }
1148     } else {
1149 #if 0
1150         if ( (l == TYPE_VECTOR && r == TYPE_FLOAT) )
1151             op = INSTR_DIV_VF;
1152         else if ( (l == TYPE_FLOAT && r == TYPE_INTEGER) )
1153             op = INSTR_DIV_FI;
1154         else if ( (l == TYPE_INTEGER && r == TYPE_FLOAT) )
1155             op = INSTR_DIV_IF;
1156         else
1157 #endif
1158             return NULL;
1159     }
1160     return ir_block_create_binop(self, label, op, left, right);
1161 }
1162
1163 /* PHI resolving breaks the SSA, and must thus be the last
1164  * step before life-range calculation.
1165  */
1166
1167 static bool ir_block_naive_phi(ir_block *self);
1168 bool ir_function_naive_phi(ir_function *self)
1169 {
1170     size_t i;
1171
1172     for (i = 0; i < self->blocks_count; ++i)
1173     {
1174         if (!ir_block_naive_phi(self->blocks[i]))
1175             return false;
1176     }
1177     return true;
1178 }
1179
1180 static bool ir_naive_phi_emit_store(ir_block *block, size_t iid, ir_value *old, ir_value *what)
1181 {
1182     ir_instr *instr;
1183     size_t i;
1184
1185     /* create a store */
1186     if (!ir_block_create_store(block, old, what))
1187         return false;
1188
1189     /* we now move it up */
1190     instr = block->instr[block->instr_count-1];
1191     for (i = block->instr_count; i > iid; --i)
1192         block->instr[i] = block->instr[i-1];
1193     block->instr[i] = instr;
1194
1195     return true;
1196 }
1197
1198 static bool ir_block_naive_phi(ir_block *self)
1199 {
1200     size_t i, p, w;
1201     /* FIXME: optionally, create_phi can add the phis
1202      * to a list so we don't need to loop through blocks
1203      * - anyway: "don't optimize YET"
1204      */
1205     for (i = 0; i < self->instr_count; ++i)
1206     {
1207         ir_instr *instr = self->instr[i];
1208         if (instr->opcode != VINSTR_PHI)
1209             continue;
1210
1211         if (!ir_block_instr_remove(self, i))
1212             return false;
1213         --i; /* NOTE: i+1 below */
1214
1215         for (p = 0; p < instr->phi_count; ++p)
1216         {
1217             ir_value *v = instr->phi[p].value;
1218             for (w = 0; w < v->writes_count; ++w) {
1219                 ir_value *old;
1220
1221                 if (!v->writes[w]->_ops[0])
1222                     continue;
1223
1224                 /* When the write was to a global, we have to emit a mov */
1225                 old = v->writes[w]->_ops[0];
1226
1227                 /* The original instruction now writes to the PHI target local */
1228                 if (v->writes[w]->_ops[0] == v)
1229                     v->writes[w]->_ops[0] = instr->_ops[0];
1230
1231                 if (old->store != store_local)
1232                 {
1233                     /* If it originally wrote to a global we need to store the value
1234                      * there as welli
1235                      */
1236                     if (!ir_naive_phi_emit_store(self, i+1, old, v))
1237                         return false;
1238                     if (i+1 < self->instr_count)
1239                         instr = self->instr[i+1];
1240                     else
1241                         instr = NULL;
1242                     /* In case I forget and access instr later, it'll be NULL
1243                      * when it's a problem, to make sure we crash, rather than accessing
1244                      * invalid data.
1245                      */
1246                 }
1247                 else
1248                 {
1249                     /* If it didn't, we can replace all reads by the phi target now. */
1250                     size_t r;
1251                     for (r = 0; r < old->reads_count; ++r)
1252                     {
1253                         size_t op;
1254                         ir_instr *ri = old->reads[r];
1255                         for (op = 0; op < ri->phi_count; ++op) {
1256                             if (ri->phi[op].value == old)
1257                                 ri->phi[op].value = v;
1258                         }
1259                         for (op = 0; op < 3; ++op) {
1260                             if (ri->_ops[op] == old)
1261                                 ri->_ops[op] = v;
1262                         }
1263                     }
1264                 }
1265             }
1266         }
1267         ir_instr_delete(instr);
1268     }
1269     return true;
1270 }
1271
1272 /***********************************************************************
1273  *IR Temp allocation code
1274  * Propagating value life ranges by walking through the function backwards
1275  * until no more changes are made.
1276  * In theory this should happen once more than once for every nested loop
1277  * level.
1278  * Though this implementation might run an additional time for if nests.
1279  */
1280
1281 typedef struct
1282 {
1283     ir_value* *v;
1284     size_t    v_count;
1285     size_t    v_alloc;
1286 } new_reads_t;
1287 MEM_VEC_FUNCTIONS_ALL(new_reads_t, ir_value*, v)
1288
1289 /* Enumerate instructions used by value's life-ranges
1290  */
1291 static void ir_block_enumerate(ir_block *self, size_t *_eid)
1292 {
1293     size_t i;
1294     size_t eid = *_eid;
1295     for (i = 0; i < self->instr_count; ++i)
1296     {
1297         self->instr[i]->eid = eid++;
1298     }
1299     *_eid = eid;
1300 }
1301
1302 /* Enumerate blocks and instructions.
1303  * The block-enumeration is unordered!
1304  * We do not really use the block enumreation, however
1305  * the instruction enumeration is important for life-ranges.
1306  */
1307 void ir_function_enumerate(ir_function *self)
1308 {
1309     size_t i;
1310     size_t instruction_id = 0;
1311     for (i = 0; i < self->blocks_count; ++i)
1312     {
1313         self->blocks[i]->eid = i;
1314         self->blocks[i]->run_id = 0;
1315         ir_block_enumerate(self->blocks[i], &instruction_id);
1316     }
1317 }
1318
1319 static bool ir_block_life_propagate(ir_block *b, ir_block *prev, bool *changed);
1320 bool ir_function_calculate_liferanges(ir_function *self)
1321 {
1322     size_t i;
1323     bool changed;
1324
1325     do {
1326         self->run_id++;
1327         changed = false;
1328         for (i = 0; i != self->blocks_count; ++i)
1329         {
1330             if (self->blocks[i]->is_return)
1331             {
1332                 if (!ir_block_life_propagate(self->blocks[i], NULL, &changed))
1333                     return false;
1334             }
1335         }
1336     } while (changed);
1337     return true;
1338 }
1339
1340 /* Get information about which operand
1341  * is read from, or written to.
1342  */
1343 static void ir_op_read_write(int op, size_t *read, size_t *write)
1344 {
1345     switch (op)
1346     {
1347     case VINSTR_JUMP:
1348     case INSTR_GOTO:
1349         *write = 0;
1350         *read = 0;
1351         break;
1352     case INSTR_IF:
1353     case INSTR_IFNOT:
1354 #if 0
1355     case INSTR_IF_S:
1356     case INSTR_IFNOT_S:
1357 #endif
1358     case INSTR_RETURN:
1359     case VINSTR_COND:
1360         *write = 0;
1361         *read = 1;
1362         break;
1363     default:
1364         *write = 1;
1365         *read = 6;
1366         break;
1367     };
1368 }
1369
1370 static bool ir_block_living_add_instr(ir_block *self, size_t eid)
1371 {
1372     size_t i;
1373     bool changed = false;
1374     bool tempbool;
1375     for (i = 0; i != self->living_count; ++i)
1376     {
1377         tempbool = ir_value_life_merge(self->living[i], eid);
1378         /* debug
1379         if (tempbool)
1380             fprintf(stderr, "block_living_add_instr() value instruction added %s: %i\n", self->living[i]->_name, (int)eid);
1381         */
1382         changed = changed || tempbool;
1383     }
1384     return changed;
1385 }
1386
1387 static bool ir_block_life_prop_previous(ir_block* self, ir_block *prev, bool *changed)
1388 {
1389     size_t i;
1390     /* values which have been read in a previous iteration are now
1391      * in the "living" array even if the previous block doesn't use them.
1392      * So we have to remove whatever does not exist in the previous block.
1393      * They will be re-added on-read, but the liferange merge won't cause
1394      * a change.
1395      */
1396     for (i = 0; i < self->living_count; ++i)
1397     {
1398         if (!ir_block_living_find(prev, self->living[i], NULL)) {
1399             if (!ir_block_living_remove(self, i))
1400                 return false;
1401             --i;
1402         }
1403     }
1404
1405     /* Whatever the previous block still has in its living set
1406      * must now be added to ours as well.
1407      */
1408     for (i = 0; i < prev->living_count; ++i)
1409     {
1410         if (ir_block_living_find(self, prev->living[i], NULL))
1411             continue;
1412         if (!ir_block_living_add(self, prev->living[i]))
1413             return false;
1414         /*
1415         printf("%s got from prev: %s\n", self->label, prev->living[i]->_name);
1416         */
1417     }
1418     return true;
1419 }
1420
1421 static bool ir_block_life_propagate(ir_block *self, ir_block *prev, bool *changed)
1422 {
1423     ir_instr *instr;
1424     ir_value *value;
1425     bool  tempbool;
1426     size_t i, o, p, rd;
1427     /* bitmasks which operands are read from or written to */
1428     size_t read, write;
1429     new_reads_t new_reads;
1430     char dbg_ind[16] = { '#', '0' };
1431     (void)dbg_ind;
1432
1433     MEM_VECTOR_INIT(&new_reads, v);
1434
1435     if (prev)
1436     {
1437         if (!ir_block_life_prop_previous(self, prev, changed))
1438             return false;
1439     }
1440
1441     i = self->instr_count;
1442     while (i)
1443     { --i;
1444         instr = self->instr[i];
1445
1446         /* PHI operands are always read operands */
1447         for (p = 0; p < instr->phi_count; ++p)
1448         {
1449             value = instr->phi[p].value;
1450             /* used this before new_reads - puts the last read into the life range as well
1451             if (!ir_block_living_find(self, value, NULL))
1452                 ir_block_living_add(self, value);
1453             */
1454             /* fprintf(stderr, "read: %s\n", value->_name); */
1455             if (!new_reads_t_v_find(&new_reads, value, NULL))
1456             {
1457                 if (!new_reads_t_v_add(&new_reads, value))
1458                     goto on_error;
1459             }
1460         }
1461
1462         /* See which operands are read and write operands */
1463         ir_op_read_write(instr->opcode, &read, &write);
1464
1465         /* Go through the 3 main operands */
1466         for (o = 0; o < 3; ++o)
1467         {
1468             if (!instr->_ops[o]) /* no such operand */
1469                 continue;
1470
1471             value = instr->_ops[o];
1472
1473             /* We only care about locals */
1474             if (value->store != store_value &&
1475                 value->store != store_local)
1476                 continue;
1477
1478             /* read operands */
1479             if (read & (1<<o))
1480             {
1481                 /* used this before new_reads - puts the last read into the life range as well
1482                 if (!ir_block_living_find(self, value, NULL))
1483                     ir_block_living_add(self, value);
1484                 */
1485                 /* fprintf(stderr, "read: %s\n", value->_name); */
1486                 if (!new_reads_t_v_find(&new_reads, value, NULL))
1487                 {
1488                     if (!new_reads_t_v_add(&new_reads, value))
1489                         goto on_error;
1490                 }
1491             }
1492
1493             /* write operands */
1494             /* When we write to a local, we consider it "dead" for the
1495              * remaining upper part of the function, since in SSA a value
1496              * can only be written once (== created)
1497              */
1498             if (write & (1<<o))
1499             {
1500                 size_t idx, readidx;
1501                 bool in_living = ir_block_living_find(self, value, &idx);
1502                 bool in_reads = new_reads_t_v_find(&new_reads, value, &readidx);
1503                 if (!in_living && !in_reads)
1504                 {
1505                     /* If the value isn't alive it hasn't been read before... */
1506                     /* TODO: See if the warning can be emitted during parsing or AST processing
1507                      * otherwise have warning printed here.
1508                      * IF printing a warning here: include filecontext_t,
1509                      * and make sure it's only printed once
1510                      * since this function is run multiple times.
1511                      */
1512                     /* For now: debug info: */
1513                     fprintf(stderr, "Value only written %s\n", value->name);
1514                     tempbool = ir_value_life_merge(value, instr->eid);
1515                     *changed = *changed || tempbool;
1516                     /*
1517                     ir_instr_dump(instr, dbg_ind, printf);
1518                     abort();
1519                     */
1520                 } else {
1521                     /* since 'living' won't contain it
1522                      * anymore, merge the value, since
1523                      * (A) doesn't.
1524                      */
1525                     tempbool = ir_value_life_merge(value, instr->eid);
1526                     /*
1527                     if (tempbool)
1528                         fprintf(stderr, "value added id %s %i\n", value->name, (int)instr->eid);
1529                     */
1530                     *changed = *changed || tempbool;
1531                     /* Then remove */
1532                     if (!ir_block_living_remove(self, idx))
1533                         goto on_error;
1534                     if (in_reads)
1535                     {
1536                         if (!new_reads_t_v_remove(&new_reads, readidx))
1537                             goto on_error;
1538                     }
1539                 }
1540             }
1541         }
1542         /* (A) */
1543         tempbool = ir_block_living_add_instr(self, instr->eid);
1544         /*fprintf(stderr, "living added values\n");*/
1545         *changed = *changed || tempbool;
1546
1547         /* new reads: */
1548         for (rd = 0; rd < new_reads.v_count; ++rd)
1549         {
1550             if (!ir_block_living_find(self, new_reads.v[rd], NULL)) {
1551                 if (!ir_block_living_add(self, new_reads.v[rd]))
1552                     goto on_error;
1553             }
1554             if (!i && !self->entries_count) {
1555                 /* fix the top */
1556                 *changed = *changed || ir_value_life_merge(new_reads.v[rd], instr->eid);
1557             }
1558         }
1559         MEM_VECTOR_CLEAR(&new_reads, v);
1560     }
1561
1562     if (self->run_id == self->owner->run_id)
1563         return true;
1564
1565     self->run_id = self->owner->run_id;
1566
1567     for (i = 0; i < self->entries_count; ++i)
1568     {
1569         ir_block *entry = self->entries[i];
1570         ir_block_life_propagate(entry, self, changed);
1571     }
1572
1573     return true;
1574 on_error:
1575     MEM_VECTOR_CLEAR(&new_reads, v);
1576     return false;
1577 }
1578
1579 /***********************************************************************
1580  *IR DEBUG Dump functions...
1581  */
1582
1583 #define IND_BUFSZ 1024
1584
1585 const char *qc_opname(int op)
1586 {
1587     if (op < 0) return "<INVALID>";
1588     if (op < ( sizeof(asm_instr) / sizeof(asm_instr[0]) ))
1589         return asm_instr[op].m;
1590     switch (op) {
1591         case VINSTR_PHI:  return "PHI";
1592         case VINSTR_JUMP: return "JUMP";
1593         case VINSTR_COND: return "COND";
1594         default:          return "<UNK>";
1595     }
1596 }
1597
1598 void ir_builder_dump(ir_builder *b, int (*oprintf)(const char*, ...))
1599 {
1600         size_t i;
1601         char indent[IND_BUFSZ];
1602         indent[0] = '\t';
1603         indent[1] = 0;
1604
1605         oprintf("module %s\n", b->name);
1606         for (i = 0; i < b->globals_count; ++i)
1607         {
1608                 oprintf("global ");
1609                 if (b->globals[i]->isconst)
1610                         oprintf("%s = ", b->globals[i]->name);
1611                 ir_value_dump(b->globals[i], oprintf);
1612                 oprintf("\n");
1613         }
1614         for (i = 0; i < b->functions_count; ++i)
1615                 ir_function_dump(b->functions[i], indent, oprintf);
1616         oprintf("endmodule %s\n", b->name);
1617 }
1618
1619 void ir_function_dump(ir_function *f, char *ind,
1620                       int (*oprintf)(const char*, ...))
1621 {
1622         size_t i;
1623         oprintf("%sfunction %s\n", ind, f->name);
1624         strncat(ind, "\t", IND_BUFSZ);
1625         if (f->locals_count)
1626         {
1627                 oprintf("%s%i locals:\n", ind, (int)f->locals_count);
1628                 for (i = 0; i < f->locals_count; ++i) {
1629                         oprintf("%s\t", ind);
1630                         ir_value_dump(f->locals[i], oprintf);
1631                         oprintf("\n");
1632                 }
1633         }
1634         if (f->blocks_count)
1635         {
1636
1637                 oprintf("%slife passes: %i\n", ind, (int)f->blocks[0]->run_id);
1638                 for (i = 0; i < f->blocks_count; ++i)
1639                         ir_block_dump(f->blocks[i], ind, oprintf);
1640
1641         }
1642         ind[strlen(ind)-1] = 0;
1643         oprintf("%sendfunction %s\n", ind, f->name);
1644 }
1645
1646 void ir_block_dump(ir_block* b, char *ind,
1647                    int (*oprintf)(const char*, ...))
1648 {
1649         size_t i;
1650         oprintf("%s:%s\n", ind, b->label);
1651         strncat(ind, "\t", IND_BUFSZ);
1652
1653         for (i = 0; i < b->instr_count; ++i)
1654                 ir_instr_dump(b->instr[i], ind, oprintf);
1655         ind[strlen(ind)-1] = 0;
1656 }
1657
1658 void dump_phi(ir_instr *in, char *ind,
1659               int (*oprintf)(const char*, ...))
1660 {
1661         size_t i;
1662         oprintf("%s <- phi ", in->_ops[0]->name);
1663         for (i = 0; i < in->phi_count; ++i)
1664         {
1665                 oprintf("([%s] : %s) ", in->phi[i].from->label,
1666                                         in->phi[i].value->name);
1667         }
1668         oprintf("\n");
1669 }
1670
1671 void ir_instr_dump(ir_instr *in, char *ind,
1672                        int (*oprintf)(const char*, ...))
1673 {
1674         size_t i;
1675         const char *comma = NULL;
1676
1677         oprintf("%s (%i) ", ind, (int)in->eid);
1678
1679         if (in->opcode == VINSTR_PHI) {
1680                 dump_phi(in, ind, oprintf);
1681                 return;
1682         }
1683
1684         strncat(ind, "\t", IND_BUFSZ);
1685
1686         if (in->_ops[0] && (in->_ops[1] || in->_ops[2])) {
1687                 ir_value_dump(in->_ops[0], oprintf);
1688                 if (in->_ops[1] || in->_ops[2])
1689                         oprintf(" <- ");
1690         }
1691         oprintf("%s\t", qc_opname(in->opcode));
1692         if (in->_ops[0] && !(in->_ops[1] || in->_ops[2])) {
1693                 ir_value_dump(in->_ops[0], oprintf);
1694                 comma = ",\t";
1695         }
1696         else
1697         {
1698                 for (i = 1; i != 3; ++i) {
1699                         if (in->_ops[i]) {
1700                                 if (comma)
1701                                         oprintf(comma);
1702                                 ir_value_dump(in->_ops[i], oprintf);
1703                                 comma = ",\t";
1704                         }
1705                 }
1706         }
1707         if (in->bops[0]) {
1708                 if (comma)
1709                         oprintf(comma);
1710                 oprintf("[%s]", in->bops[0]->label);
1711                 comma = ",\t";
1712         }
1713         if (in->bops[1])
1714                 oprintf("%s[%s]", comma, in->bops[1]->label);
1715         oprintf("\n");
1716         ind[strlen(ind)-1] = 0;
1717 }
1718
1719 void ir_value_dump(ir_value* v, int (*oprintf)(const char*, ...))
1720 {
1721         if (v->isconst) {
1722                 switch (v->vtype) {
1723                         case TYPE_VOID:
1724                                 oprintf("(void)");
1725                                 break;
1726                         case TYPE_FLOAT:
1727                                 oprintf("%g", v->constval.vfloat);
1728                                 break;
1729                         case TYPE_VECTOR:
1730                                 oprintf("'%g %g %g'",
1731                                         v->constval.vvec.x,
1732                                         v->constval.vvec.y,
1733                                         v->constval.vvec.z);
1734                                 break;
1735                         case TYPE_ENTITY:
1736                                 oprintf("(entity)");
1737                                 break;
1738                         case TYPE_STRING:
1739                                 oprintf("\"%s\"", v->constval.vstring);
1740                                 break;
1741 #if 0
1742                         case TYPE_INTEGER:
1743                                 oprintf("%i", v->constval.vint);
1744                                 break;
1745 #endif
1746                         case TYPE_POINTER:
1747                                 oprintf("&%s",
1748                                         v->constval.vpointer->name);
1749                                 break;
1750                 }
1751         } else {
1752                 oprintf("%s", v->name);
1753         }
1754 }
1755
1756 void ir_value_dump_life(ir_value *self, int (*oprintf)(const char*,...))
1757 {
1758         size_t i;
1759         oprintf("Life of %s:\n", self->name);
1760         for (i = 0; i < self->life_count; ++i)
1761         {
1762                 oprintf(" + [%i, %i]\n", self->life[i].start, self->life[i].end);
1763         }
1764 }