ast.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 <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26
  27 #include "gmqcc.h"
  28 #include "ast.h"
  29
  30 #define ast_instantiate(T, ctx, destroyfn)                          \
  31     T* self = (T*)mem_a(sizeof(T));                                 \
  32     if (!self) {                                                    \
  33         return NULL;                                                \
  34     }                                                               \
  35     ast_node_init((ast_node*)self, ctx, TYPE_##T);                  \
  36     ( (ast_node*)self )->node.destroy = (ast_node_delete*)destroyfn
  37
  38 /* error handling */
  39 static void asterror(lex_ctx ctx, const char *msg, ...)
  40 {
  41     va_list ap;
  42     va_start(ap, msg);
  43     cvprintmsg(ctx, LVL_ERROR, "error", msg, ap);
  44     va_end(ap);
  45 }
  46
  47 /* It must not be possible to get here. */
  48 static GMQCC_NORETURN void _ast_node_destroy(ast_node *self)
  49 {
  50     fprintf(stderr, "ast node missing destroy()\n");
  51     abort();
  52 }
  53
  54 /* Initialize main ast node aprts */
  55 static void ast_node_init(ast_node *self, lex_ctx ctx, int nodetype)
  56 {
  57     self->node.context = ctx;
  58     self->node.destroy = &_ast_node_destroy;
  59     self->node.keep    = false;
  60     self->node.nodetype = nodetype;
  61 }
  62
  63 /* General expression initialization */
  64 static void ast_expression_init(ast_expression *self,
  65                                 ast_expression_codegen *codegen)
  66 {
  67     self->expression.codegen = codegen;
  68     self->expression.vtype   = TYPE_VOID;
  69     self->expression.next    = NULL;
  70     self->expression.outl    = NULL;
  71     self->expression.outr    = NULL;
  72     MEM_VECTOR_INIT(&self->expression, params);
  73 }
  74
  75 static void ast_expression_delete(ast_expression *self)
  76 {
  77     size_t i;
  78     if (self->expression.next)
  79         ast_delete(self->expression.next);
  80     for (i = 0; i < self->expression.params_count; ++i) {
  81         ast_delete(self->expression.params[i]);
  82     }
  83     MEM_VECTOR_CLEAR(&self->expression, params);
  84 }
  85
  86 static void ast_expression_delete_full(ast_expression *self)
  87 {
  88     ast_expression_delete(self);
  89     mem_d(self);
  90 }
  91
  92 MEM_VEC_FUNCTIONS(ast_expression_common, ast_value*, params)
  93
  94 static ast_expression* ast_type_copy(lex_ctx ctx, const ast_expression *ex);
  95 ast_value* ast_value_copy(const ast_value *self)
  96 {
  97     size_t i;
  98     const ast_expression_common *fromex;
  99     ast_expression_common *selfex;
 100     ast_value *cp = ast_value_new(self->expression.node.context, self->name, self->expression.vtype);
 101     if (self->expression.next) {
 102         cp->expression.next = ast_type_copy(self->expression.node.context, self->expression.next);
 103         if (!cp->expression.next) {
 104             ast_value_delete(cp);
 105             return NULL;
 106         }
 107     }
 108     fromex   = &self->expression;
 109     selfex = &cp->expression;
 110     for (i = 0; i < fromex->params_count; ++i) {
 111         ast_value *v = ast_value_copy(fromex->params[i]);
 112         if (!v || !ast_expression_common_params_add(selfex, v)) {
 113             ast_value_delete(cp);
 114             return NULL;
 115         }
 116     }
 117     return cp;
 118 }
 119
 120 static ast_expression* ast_shallow_type(lex_ctx ctx, int vtype)
 121 {
 122     ast_instantiate(ast_expression, ctx, ast_expression_delete_full);
 123     ast_expression_init(self, NULL);
 124     self->expression.codegen = NULL;
 125     self->expression.next    = NULL;
 126     self->expression.vtype   = vtype;
 127     return self;
 128 }
 129
 130 static ast_expression* ast_type_copy(lex_ctx ctx, const ast_expression *ex)
 131 {
 132     size_t i;
 133     const ast_expression_common *fromex;
 134     ast_expression_common *selfex;
 135
 136     if (!ex)
 137         return NULL;
 138     else
 139     {
 140         ast_instantiate(ast_expression, ctx, ast_expression_delete_full);
 141         ast_expression_init(self, NULL);
 142
 143         fromex   = &ex->expression;
 144         selfex = &self->expression;
 145
 146         /* This may never be codegen()d */
 147         selfex->codegen = NULL;
 148
 149         selfex->vtype = fromex->vtype;
 150         if (fromex->next)
 151         {
 152             selfex->next = ast_type_copy(ctx, fromex->next);
 153             if (!selfex->next) {
 154                 ast_expression_delete_full(self);
 155                 return NULL;
 156             }
 157         }
 158         else
 159             selfex->next = NULL;
 160
 161         for (i = 0; i < fromex->params_count; ++i) {
 162             ast_value *v = ast_value_copy(fromex->params[i]);
 163             if (!v || !ast_expression_common_params_add(selfex, v)) {
 164                 ast_expression_delete_full(self);
 165                 return NULL;
 166             }
 167         }
 168
 169         return self;
 170     }
 171 }
 172
 173 bool ast_compare_type(ast_expression *a, ast_expression *b)
 174 {
 175     if (a->expression.vtype != b->expression.vtype)
 176         return false;
 177     if (!a->expression.next != !b->expression.next)
 178         return false;
 179     if (a->expression.params_count != b->expression.params_count)
 180         return false;
 181     if (a->expression.params_count) {
 182         size_t i;
 183         for (i = 0; i < a->expression.params_count; ++i) {
 184             if (!ast_compare_type((ast_expression*)a->expression.params[i],
 185                                   (ast_expression*)b->expression.params[i]))
 186                 return false;
 187         }
 188     }
 189     if (a->expression.next)
 190         return ast_compare_type(a->expression.next, b->expression.next);
 191     return true;
 192 }
 193
 194 ast_value* ast_value_new(lex_ctx ctx, const char *name, int t)
 195 {
 196     ast_instantiate(ast_value, ctx, ast_value_delete);
 197     ast_expression_init((ast_expression*)self,
 198                         (ast_expression_codegen*)&ast_value_codegen);
 199     self->expression.node.keep = true; /* keep */
 200
 201     self->name = name ? util_strdup(name) : NULL;
 202     self->expression.vtype = t;
 203     self->expression.next  = NULL;
 204     self->isconst = false;
 205     memset(&self->constval, 0, sizeof(self->constval));
 206
 207     self->ir_v    = NULL;
 208
 209     return self;
 210 }
 211
 212 void ast_value_delete(ast_value* self)
 213 {
 214     if (self->name)
 215         mem_d((void*)self->name);
 216     if (self->isconst) {
 217         switch (self->expression.vtype)
 218         {
 219         case TYPE_STRING:
 220             mem_d((void*)self->constval.vstring);
 221             break;
 222         case TYPE_FUNCTION:
 223             /* unlink us from the function node */
 224             self->constval.vfunc->vtype = NULL;
 225             break;
 226         /* NOTE: delete function? currently collected in
 227          * the parser structure
 228          */
 229         default:
 230             break;
 231         }
 232     }
 233     ast_expression_delete((ast_expression*)self);
 234     mem_d(self);
 235 }
 236
 237 bool GMQCC_WARN ast_value_params_add(ast_value *self, ast_value *p)
 238 {
 239     return ast_expression_common_params_add(&self->expression, p);
 240 }
 241
 242 bool ast_value_set_name(ast_value *self, const char *name)
 243 {
 244     if (self->name)
 245         mem_d((void*)self->name);
 246     self->name = util_strdup(name);
 247     return !!self->name;
 248 }
 249
 250 ast_binary* ast_binary_new(lex_ctx ctx, int op,
 251                            ast_expression* left, ast_expression* right)
 252 {
 253     ast_instantiate(ast_binary, ctx, ast_binary_delete);
 254     ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_binary_codegen);
 255
 256     self->op = op;
 257     self->left = left;
 258     self->right = right;
 259
 260     if (op >= INSTR_EQ_F && op <= INSTR_GT)
 261         self->expression.vtype = TYPE_FLOAT;
 262     else if (op == INSTR_AND || op == INSTR_OR ||
 263              op == INSTR_BITAND || op == INSTR_BITOR)
 264         self->expression.vtype = TYPE_FLOAT;
 265     else if (op == INSTR_MUL_VF || op == INSTR_MUL_FV)
 266         self->expression.vtype = TYPE_VECTOR;
 267     else if (op == INSTR_MUL_V)
 268         self->expression.vtype = TYPE_FLOAT;
 269     else
 270         self->expression.vtype = left->expression.vtype;
 271
 272     return self;
 273 }
 274
 275 void ast_binary_delete(ast_binary *self)
 276 {
 277     ast_unref(self->left);
 278     ast_unref(self->right);
 279     ast_expression_delete((ast_expression*)self);
 280     mem_d(self);
 281 }
 282
 283 ast_binstore* ast_binstore_new(lex_ctx ctx, int storop, int op,
 284                                ast_expression* left, ast_expression* right)
 285 {
 286     ast_instantiate(ast_binstore, ctx, ast_binstore_delete);
 287     ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_binstore_codegen);
 288
 289     self->opstore = storop;
 290     self->opbin   = op;
 291     self->dest    = left;
 292     self->source  = right;
 293
 294     self->expression.vtype = left->expression.vtype;
 295     if (left->expression.next) {
 296         self->expression.next = ast_type_copy(ctx, left);
 297         if (!self->expression.next) {
 298             ast_delete(self);
 299             return NULL;
 300         }
 301     }
 302     else
 303         self->expression.next = NULL;
 304
 305     return self;
 306 }
 307
 308 void ast_binstore_delete(ast_binstore *self)
 309 {
 310     ast_unref(self->dest);
 311     ast_unref(self->source);
 312     ast_expression_delete((ast_expression*)self);
 313     mem_d(self);
 314 }
 315
 316 ast_unary* ast_unary_new(lex_ctx ctx, int op,
 317                          ast_expression *expr)
 318 {
 319     ast_instantiate(ast_unary, ctx, ast_unary_delete);
 320     ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_unary_codegen);
 321
 322     self->op = op;
 323     self->operand = expr;
 324
 325     return self;
 326 }
 327
 328 void ast_unary_delete(ast_unary *self)
 329 {
 330     ast_unref(self->operand);
 331     ast_expression_delete((ast_expression*)self);
 332     mem_d(self);
 333 }
 334
 335 ast_return* ast_return_new(lex_ctx ctx, ast_expression *expr)
 336 {
 337     ast_instantiate(ast_return, ctx, ast_return_delete);
 338     ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_return_codegen);
 339
 340     self->operand = expr;
 341
 342     return self;
 343 }
 344
 345 void ast_return_delete(ast_return *self)
 346 {
 347     ast_unref(self->operand);
 348     ast_expression_delete((ast_expression*)self);
 349     mem_d(self);
 350 }
 351
 352 ast_entfield* ast_entfield_new(lex_ctx ctx, ast_expression *entity, ast_expression *field)
 353 {
 354     const ast_expression *outtype;
 355
 356     ast_instantiate(ast_entfield, ctx, ast_entfield_delete);
 357
 358     if (field->expression.vtype != TYPE_FIELD) {
 359         mem_d(self);
 360         return NULL;
 361     }
 362
 363     outtype = field->expression.next;
 364     if (!outtype) {
 365         mem_d(self);
 366         /* Error: field has no type... */
 367         return NULL;
 368     }
 369
 370     ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_entfield_codegen);
 371
 372     self->expression.vtype = outtype->expression.vtype;
 373     self->expression.next  = ast_type_copy(ctx, outtype->expression.next);
 374
 375     self->entity = entity;
 376     self->field  = field;
 377
 378     return self;
 379 }
 380
 381 void ast_entfield_delete(ast_entfield *self)
 382 {
 383     ast_unref(self->entity);
 384     ast_unref(self->field);
 385     ast_expression_delete((ast_expression*)self);
 386     mem_d(self);
 387 }
 388
 389 ast_member* ast_member_new(lex_ctx ctx, ast_expression *owner, unsigned int field)
 390 {
 391     ast_instantiate(ast_member, ctx, ast_member_delete);
 392     if (field >= 3) {
 393         mem_d(self);
 394         return NULL;
 395     }
 396
 397     if (owner->expression.vtype != TYPE_VECTOR &&
 398         owner->expression.vtype != TYPE_FIELD) {
 399         asterror(ctx, "member-access on an invalid owner of type %s\n", type_name[owner->expression.vtype]);
 400         mem_d(self);
 401         return NULL;
 402     }
 403
 404     ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_member_codegen);
 405     self->expression.node.keep = true; /* keep */
 406
 407     if (owner->expression.vtype == TYPE_VECTOR) {
 408         self->expression.vtype = TYPE_FLOAT;
 409         self->expression.next  = NULL;
 410     } else {
 411         self->expression.vtype = TYPE_FIELD;
 412         self->expression.next = ast_shallow_type(ctx, TYPE_FLOAT);
 413     }
 414
 415     self->owner = owner;
 416     self->field = field;
 417
 418     return self;
 419 }
 420
 421 void ast_member_delete(ast_member *self)
 422 {
 423     /* The owner is always an ast_value, which has .keep=true,
 424      * also: ast_members are usually deleted after the owner, thus
 425      * this will cause invalid access
 426     ast_unref(self->owner);
 427      * once we allow (expression).x to access a vector-member, we need
 428      * to change this: preferably by creating an alternate ast node for this
 429      * purpose that is not garbage-collected.
 430     */
 431     ast_expression_delete((ast_expression*)self);
 432     mem_d(self);
 433 }
 434
 435 ast_ifthen* ast_ifthen_new(lex_ctx ctx, ast_expression *cond, ast_expression *ontrue, ast_expression *onfalse)
 436 {
 437     ast_instantiate(ast_ifthen, ctx, ast_ifthen_delete);
 438     if (!ontrue && !onfalse) {
 439         /* because it is invalid */
 440         mem_d(self);
 441         return NULL;
 442     }
 443     ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_ifthen_codegen);
 444
 445     self->cond     = cond;
 446     self->on_true  = ontrue;
 447     self->on_false = onfalse;
 448
 449     return self;
 450 }
 451
 452 void ast_ifthen_delete(ast_ifthen *self)
 453 {
 454     ast_unref(self->cond);
 455     if (self->on_true)
 456         ast_unref(self->on_true);
 457     if (self->on_false)
 458         ast_unref(self->on_false);
 459     ast_expression_delete((ast_expression*)self);
 460     mem_d(self);
 461 }
 462
 463 ast_ternary* ast_ternary_new(lex_ctx ctx, ast_expression *cond, ast_expression *ontrue, ast_expression *onfalse)
 464 {
 465     ast_instantiate(ast_ternary, ctx, ast_ternary_delete);
 466     /* This time NEITHER must be NULL */
 467     if (!ontrue || !onfalse) {
 468         mem_d(self);
 469         return NULL;
 470     }
 471     ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_ternary_codegen);
 472
 473     self->cond     = cond;
 474     self->on_true  = ontrue;
 475     self->on_false = onfalse;
 476     self->phi_out  = NULL;
 477
 478     return self;
 479 }
 480
 481 void ast_ternary_delete(ast_ternary *self)
 482 {
 483     ast_unref(self->cond);
 484     ast_unref(self->on_true);
 485     ast_unref(self->on_false);
 486     ast_expression_delete((ast_expression*)self);
 487     mem_d(self);
 488 }
 489
 490 ast_loop* ast_loop_new(lex_ctx ctx,
 491                        ast_expression *initexpr,
 492                        ast_expression *precond,
 493                        ast_expression *postcond,
 494                        ast_expression *increment,
 495                        ast_expression *body)
 496 {
 497     ast_instantiate(ast_loop, ctx, ast_loop_delete);
 498     ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_loop_codegen);
 499
 500     self->initexpr  = initexpr;
 501     self->precond   = precond;
 502     self->postcond  = postcond;
 503     self->increment = increment;
 504     self->body      = body;
 505
 506     return self;
 507 }
 508
 509 void ast_loop_delete(ast_loop *self)
 510 {
 511     if (self->initexpr)
 512         ast_unref(self->initexpr);
 513     if (self->precond)
 514         ast_unref(self->precond);
 515     if (self->postcond)
 516         ast_unref(self->postcond);
 517     if (self->increment)
 518         ast_unref(self->increment);
 519     if (self->body)
 520         ast_unref(self->body);
 521     ast_expression_delete((ast_expression*)self);
 522     mem_d(self);
 523 }
 524
 525 ast_call* ast_call_new(lex_ctx ctx,
 526                        ast_expression *funcexpr)
 527 {
 528     ast_instantiate(ast_call, ctx, ast_call_delete);
 529     ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_call_codegen);
 530
 531     MEM_VECTOR_INIT(self, params);
 532
 533     self->func = funcexpr;
 534
 535     return self;
 536 }
 537 MEM_VEC_FUNCTIONS(ast_call, ast_expression*, params)
 538
 539 void ast_call_delete(ast_call *self)
 540 {
 541     size_t i;
 542     for (i = 0; i < self->params_count; ++i)
 543         ast_unref(self->params[i]);
 544     MEM_VECTOR_CLEAR(self, params);
 545
 546     if (self->func)
 547         ast_unref(self->func);
 548
 549     ast_expression_delete((ast_expression*)self);
 550     mem_d(self);
 551 }
 552
 553 ast_store* ast_store_new(lex_ctx ctx, int op,
 554                          ast_expression *dest, ast_expression *source)
 555 {
 556     ast_instantiate(ast_store, ctx, ast_store_delete);
 557     ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_store_codegen);
 558
 559     self->op = op;
 560     self->dest = dest;
 561     self->source = source;
 562
 563     return self;
 564 }
 565
 566 void ast_store_delete(ast_store *self)
 567 {
 568     ast_unref(self->dest);
 569     ast_unref(self->source);
 570     ast_expression_delete((ast_expression*)self);
 571     mem_d(self);
 572 }
 573
 574 ast_block* ast_block_new(lex_ctx ctx)
 575 {
 576     ast_instantiate(ast_block, ctx, ast_block_delete);
 577     ast_expression_init((ast_expression*)self,
 578                         (ast_expression_codegen*)&ast_block_codegen);
 579
 580     MEM_VECTOR_INIT(self, locals);
 581     MEM_VECTOR_INIT(self, exprs);
 582     MEM_VECTOR_INIT(self, collect);
 583
 584     return self;
 585 }
 586 MEM_VEC_FUNCTIONS(ast_block, ast_value*, locals)
 587 MEM_VEC_FUNCTIONS(ast_block, ast_expression*, exprs)
 588 MEM_VEC_FUNCTIONS(ast_block, ast_expression*, collect)
 589
 590 bool ast_block_collect(ast_block *self, ast_expression *expr)
 591 {
 592     if (!ast_block_collect_add(self, expr))
 593         return false;
 594     expr->expression.node.keep = true;
 595     return true;
 596 }
 597
 598 void ast_block_delete(ast_block *self)
 599 {
 600     size_t i;
 601     for (i = 0; i < self->exprs_count; ++i)
 602         ast_unref(self->exprs[i]);
 603     MEM_VECTOR_CLEAR(self, exprs);
 604     for (i = 0; i < self->locals_count; ++i)
 605         ast_delete(self->locals[i]);
 606     MEM_VECTOR_CLEAR(self, locals);
 607     for (i = 0; i < self->collect_count; ++i)
 608         ast_delete(self->collect[i]);
 609     MEM_VECTOR_CLEAR(self, collect);
 610     ast_expression_delete((ast_expression*)self);
 611     mem_d(self);
 612 }
 613
 614 bool ast_block_set_type(ast_block *self, ast_expression *from)
 615 {
 616     if (self->expression.next)
 617         ast_delete(self->expression.next);
 618     self->expression.vtype = from->expression.vtype;
 619     if (from->expression.next) {
 620         self->expression.next = ast_type_copy(self->expression.node.context, from->expression.next);
 621         if (!self->expression.next)
 622             return false;
 623     }
 624     else
 625         self->expression.next = NULL;
 626     return true;
 627 }
 628
 629 ast_function* ast_function_new(lex_ctx ctx, const char *name, ast_value *vtype)
 630 {
 631     ast_instantiate(ast_function, ctx, ast_function_delete);
 632
 633     if (!vtype ||
 634         vtype->isconst ||
 635         vtype->expression.vtype != TYPE_FUNCTION)
 636     {
 637         mem_d(self);
 638         return NULL;
 639     }
 640
 641     self->vtype = vtype;
 642     self->name = name ? util_strdup(name) : NULL;
 643     MEM_VECTOR_INIT(self, blocks);
 644
 645     self->labelcount = 0;
 646     self->builtin = 0;
 647
 648     self->ir_func = NULL;
 649     self->curblock = NULL;
 650
 651     self->breakblock    = NULL;
 652     self->continueblock = NULL;
 653
 654     vtype->isconst = true;
 655     vtype->constval.vfunc = self;
 656
 657     return self;
 658 }
 659
 660 MEM_VEC_FUNCTIONS(ast_function, ast_block*, blocks)
 661
 662 void ast_function_delete(ast_function *self)
 663 {
 664     size_t i;
 665     if (self->name)
 666         mem_d((void*)self->name);
 667     if (self->vtype) {
 668         /* ast_value_delete(self->vtype); */
 669         self->vtype->isconst = false;
 670         self->vtype->constval.vfunc = NULL;
 671         /* We use unref - if it was stored in a global table it is supposed
 672          * to be deleted from *there*
 673          */
 674         ast_unref(self->vtype);
 675     }
 676     for (i = 0; i < self->blocks_count; ++i)
 677         ast_delete(self->blocks[i]);
 678     MEM_VECTOR_CLEAR(self, blocks);
 679     mem_d(self);
 680 }
 681
 682 static void ast_util_hexitoa(char *buf, size_t size, unsigned int num)
 683 {
 684     unsigned int base = 10;
 685 #define checknul() do { if (size == 1) { *buf = 0; return; } } while (0)
 686 #define addch(x) do { *buf++ = (x); --size; checknul(); } while (0)
 687     if (size < 1)
 688         return;
 689     checknul();
 690     if (!num)
 691         addch('0');
 692     else {
 693         while (num)
 694         {
 695             int digit = num % base;
 696             num /= base;
 697             addch('0' + digit);
 698         }
 699     }
 700
 701     *buf = 0;
 702 #undef addch
 703 #undef checknul
 704 }
 705
 706 const char* ast_function_label(ast_function *self, const char *prefix)
 707 {
 708     size_t id = (self->labelcount++);
 709     size_t len = strlen(prefix);
 710     strncpy(self->labelbuf, prefix, sizeof(self->labelbuf));
 711     ast_util_hexitoa(self->labelbuf + len, sizeof(self->labelbuf)-len, id);
 712     return self->labelbuf;
 713 }
 714
 715 /*********************************************************************/
 716 /* AST codegen part
 717  * by convention you must never pass NULL to the 'ir_value **out'
 718  * parameter. If you really don't care about the output, pass a dummy.
 719  * But I can't imagine a pituation where the output is truly unnecessary.
 720  */
 721
 722 bool ast_value_codegen(ast_value *self, ast_function *func, bool lvalue, ir_value **out)
 723 {
 724     /* NOTE: This is the codegen for a variable used in an expression.
 725      * It is not the codegen to generate the value. For this purpose,
 726      * ast_local_codegen and ast_global_codegen are to be used before this
 727      * is executed. ast_function_codegen should take care of its locals,
 728      * and the ast-user should take care of ast_global_codegen to be used
 729      * on all the globals.
 730      */
 731     if (!self->ir_v) {
 732         asterror(ast_ctx(self), "ast_value used before generated (%s)\n", self->name);
 733         return false;
 734     }
 735     *out = self->ir_v;
 736     return true;
 737 }
 738
 739 bool ast_global_codegen(ast_value *self, ir_builder *ir)
 740 {
 741     ir_value *v = NULL;
 742     if (self->isconst && self->expression.vtype == TYPE_FUNCTION)
 743     {
 744         ir_function *func = ir_builder_create_function(ir, self->name, self->expression.next->expression.vtype);
 745         if (!func)
 746             return false;
 747
 748         self->constval.vfunc->ir_func = func;
 749         self->ir_v = func->value;
 750         /* The function is filled later on ast_function_codegen... */
 751         return true;
 752     }
 753
 754     if (self->expression.vtype == TYPE_FIELD) {
 755         v = ir_builder_create_field(ir, self->name, self->expression.next->expression.vtype);
 756         if (!v)
 757             return false;
 758         if (self->isconst) {
 759             asterror(ast_ctx(self), "TODO: constant field pointers with value\n");
 760             goto error;
 761         }
 762         self->ir_v = v;
 763         return true;
 764     }
 765
 766     v = ir_builder_create_global(ir, self->name, self->expression.vtype);
 767     if (!v) {
 768         asterror(ast_ctx(self), "ir_builder_create_global failed\n");
 769         return false;
 770     }
 771
 772     if (self->isconst) {
 773         switch (self->expression.vtype)
 774         {
 775             case TYPE_FLOAT:
 776                 if (!ir_value_set_float(v, self->constval.vfloat))
 777                     goto error;
 778                 break;
 779             case TYPE_VECTOR:
 780                 if (!ir_value_set_vector(v, self->constval.vvec))
 781                     goto error;
 782                 break;
 783             case TYPE_STRING:
 784                 if (!ir_value_set_string(v, self->constval.vstring))
 785                     goto error;
 786                 break;
 787             case TYPE_FUNCTION:
 788                 asterror(ast_ctx(self), "global of type function not properly generated\n");
 789                 goto error;
 790                 /* Cannot generate an IR value for a function,
 791                  * need a pointer pointing to a function rather.
 792                  */
 793             default:
 794                 asterror(ast_ctx(self), "TODO: global constant type %i\n", self->expression.vtype);
 795                 break;
 796         }
 797     }
 798
 799     /* link us to the ir_value */
 800     self->ir_v = v;
 801     return true;
 802
 803 error: /* clean up */
 804     ir_value_delete(v);
 805     return false;
 806 }
 807
 808 bool ast_local_codegen(ast_value *self, ir_function *func, bool param)
 809 {
 810     ir_value *v = NULL;
 811     if (self->isconst && self->expression.vtype == TYPE_FUNCTION)
 812     {
 813         /* Do we allow local functions? I think not...
 814          * this is NOT a function pointer atm.
 815          */
 816         return false;
 817     }
 818
 819     v = ir_function_create_local(func, self->name, self->expression.vtype, param);
 820     if (!v)
 821         return false;
 822
 823     /* A constant local... hmmm...
 824      * I suppose the IR will have to deal with this
 825      */
 826     if (self->isconst) {
 827         switch (self->expression.vtype)
 828         {
 829             case TYPE_FLOAT:
 830                 if (!ir_value_set_float(v, self->constval.vfloat))
 831                     goto error;
 832                 break;
 833             case TYPE_VECTOR:
 834                 if (!ir_value_set_vector(v, self->constval.vvec))
 835                     goto error;
 836                 break;
 837             case TYPE_STRING:
 838                 if (!ir_value_set_string(v, self->constval.vstring))
 839                     goto error;
 840                 break;
 841             default:
 842                 asterror(ast_ctx(self), "TODO: global constant type %i\n", self->expression.vtype);
 843                 break;
 844         }
 845     }
 846
 847     /* link us to the ir_value */
 848     self->ir_v = v;
 849     return true;
 850
 851 error: /* clean up */
 852     ir_value_delete(v);
 853     return false;
 854 }
 855
 856 bool ast_function_codegen(ast_function *self, ir_builder *ir)
 857 {
 858     ir_function *irf;
 859     ir_value    *dummy;
 860     ast_expression_common *ec;
 861     size_t    i;
 862
 863     irf = self->ir_func;
 864     if (!irf) {
 865         asterror(ast_ctx(self), "ast_function's related ast_value was not generated yet\n");
 866         return false;
 867     }
 868
 869     /* fill the parameter list */
 870     ec = &self->vtype->expression;
 871     for (i = 0; i < ec->params_count; ++i)
 872     {
 873         if (!ir_function_params_add(irf, ec->params[i]->expression.vtype))
 874             return false;
 875         if (!self->builtin) {
 876             if (!ast_local_codegen(ec->params[i], self->ir_func, true))
 877                 return false;
 878         }
 879     }
 880
 881     if (self->builtin) {
 882         irf->builtin = self->builtin;
 883         return true;
 884     }
 885
 886     if (!self->blocks_count) {
 887         asterror(ast_ctx(self), "function `%s` has no body", self->name);
 888         return false;
 889     }
 890
 891     self->curblock = ir_function_create_block(irf, "entry");
 892     if (!self->curblock)
 893         return false;
 894
 895     for (i = 0; i < self->blocks_count; ++i) {
 896         ast_expression_codegen *gen = self->blocks[i]->expression.codegen;
 897         if (!(*gen)((ast_expression*)self->blocks[i], self, false, &dummy))
 898             return false;
 899     }
 900
 901     /* TODO: check return types */
 902     if (!self->curblock->is_return)
 903     {
 904         if (!self->vtype->expression.next ||
 905             self->vtype->expression.next->expression.vtype == TYPE_VOID)
 906         {
 907             return ir_block_create_return(self->curblock, NULL);
 908         }
 909         else
 910         {
 911             /* error("missing return"); */
 912             asterror(ast_ctx(self), "function `%s` missing return value", self->name);
 913             return false;
 914         }
 915     }
 916     return true;
 917 }
 918
 919 /* Note, you will not see ast_block_codegen generate ir_blocks.
 920  * To the AST and the IR, blocks are 2 different things.
 921  * In the AST it represents a block of code, usually enclosed in
 922  * curly braces {...}.
 923  * While in the IR it represents a block in terms of control-flow.
 924  */
 925 bool ast_block_codegen(ast_block *self, ast_function *func, bool lvalue, ir_value **out)
 926 {
 927     size_t i;
 928
 929     /* We don't use this
 930      * Note: an ast-representation using the comma-operator
 931      * of the form: (a, b, c) = x should not assign to c...
 932      */
 933     (void)lvalue;
 934     if (self->expression.outr) {
 935         *out = self->expression.outr;
 936         return true;
 937     }
 938
 939     /* output is NULL at first, we'll have each expression
 940      * assign to out output, thus, a comma-operator represention
 941      * using an ast_block will return the last generated value,
 942      * so: (b, c) + a  executed both b and c, and returns c,
 943      * which is then added to a.
 944      */
 945     *out = NULL;
 946
 947     /* generate locals */
 948     for (i = 0; i < self->locals_count; ++i)
 949     {
 950         if (!ast_local_codegen(self->locals[i], func->ir_func, false))
 951             return false;
 952     }
 953
 954     for (i = 0; i < self->exprs_count; ++i)
 955     {
 956         ast_expression_codegen *gen = self->exprs[i]->expression.codegen;
 957         if (!(*gen)(self->exprs[i], func, false, out))
 958             return false;
 959     }
 960
 961     self->expression.outr = *out;
 962
 963     return true;
 964 }
 965
 966 bool ast_store_codegen(ast_store *self, ast_function *func, bool lvalue, ir_value **out)
 967 {
 968     ast_expression_codegen *cgen;
 969     ir_value *left, *right;
 970
 971     if (lvalue && self->expression.outl) {
 972         *out = self->expression.outl;
 973         return true;
 974     }
 975
 976     if (!lvalue && self->expression.outr) {
 977         *out = self->expression.outr;
 978         return true;
 979     }
 980
 981     cgen = self->dest->expression.codegen;
 982     /* lvalue! */
 983     if (!(*cgen)((ast_expression*)(self->dest), func, true, &left))
 984         return false;
 985     self->expression.outl = left;
 986
 987     cgen = self->source->expression.codegen;
 988     /* rvalue! */
 989     if (!(*cgen)((ast_expression*)(self->source), func, false, &right))
 990         return false;
 991
 992     if (!ir_block_create_store_op(func->curblock, self->op, left, right))
 993         return false;
 994     self->expression.outr = right;
 995
 996     /* Theoretically, an assinment returns its left side as an
 997      * lvalue, if we don't need an lvalue though, we return
 998      * the right side as an rvalue, otherwise we have to
 999      * somehow know whether or not we need to dereference the pointer
1000      * on the left side - that is: OP_LOAD if it was an address.
1001      * Also: in original QC we cannot OP_LOADP *anyway*.
1002      */
1003     *out = (lvalue ? left : right);
1004
1005     return true;
1006 }
1007
1008 bool ast_binary_codegen(ast_binary *self, ast_function *func, bool lvalue, ir_value **out)
1009 {
1010     ast_expression_codegen *cgen;
1011     ir_value *left, *right;
1012
1013     /* In the context of a binary operation, we can disregard
1014      * the lvalue flag.
1015      */
1016     (void)lvalue;
1017     if (self->expression.outr) {
1018         *out = self->expression.outr;
1019         return true;
1020     }
1021
1022     cgen = self->left->expression.codegen;
1023     /* lvalue! */
1024     if (!(*cgen)((ast_expression*)(self->left), func, false, &left))
1025         return false;
1026
1027     cgen = self->right->expression.codegen;
1028     /* rvalue! */
1029     if (!(*cgen)((ast_expression*)(self->right), func, false, &right))
1030         return false;
1031
1032     *out = ir_block_create_binop(func->curblock, ast_function_label(func, "bin"),
1033                                  self->op, left, right);
1034     if (!*out)
1035         return false;
1036     self->expression.outr = *out;
1037
1038     return true;
1039 }
1040
1041 bool ast_binstore_codegen(ast_binstore *self, ast_function *func, bool lvalue, ir_value **out)
1042 {
1043     ast_expression_codegen *cgen;
1044     ir_value *leftl, *leftr, *right, *bin;
1045
1046     if (lvalue && self->expression.outl) {
1047         *out = self->expression.outl;
1048         return true;
1049     }
1050
1051     if (!lvalue && self->expression.outr) {
1052         *out = self->expression.outr;
1053         return true;
1054     }
1055
1056     /* for a binstore we need both an lvalue and an rvalue for the left side */
1057     /* rvalue of destination! */
1058     cgen = self->dest->expression.codegen;
1059     if (!(*cgen)((ast_expression*)(self->dest), func, false, &leftr))
1060         return false;
1061
1062     /* source as rvalue only */
1063     cgen = self->source->expression.codegen;
1064     if (!(*cgen)((ast_expression*)(self->source), func, false, &right))
1065         return false;
1066
1067     /* now the binary */
1068     bin = ir_block_create_binop(func->curblock, ast_function_label(func, "binst"),
1069                                 self->opbin, leftr, right);
1070     self->expression.outr = bin;
1071
1072     /* now store them */
1073     cgen = self->dest->expression.codegen;
1074     /* lvalue of destination */
1075     if (!(*cgen)((ast_expression*)(self->dest), func, true, &leftl))
1076         return false;
1077     self->expression.outl = leftl;
1078
1079     if (!ir_block_create_store_op(func->curblock, self->opstore, leftl, bin))
1080         return false;
1081     self->expression.outr = bin;
1082
1083     /* Theoretically, an assinment returns its left side as an
1084      * lvalue, if we don't need an lvalue though, we return
1085      * the right side as an rvalue, otherwise we have to
1086      * somehow know whether or not we need to dereference the pointer
1087      * on the left side - that is: OP_LOAD if it was an address.
1088      * Also: in original QC we cannot OP_LOADP *anyway*.
1089      */
1090     *out = (lvalue ? leftl : bin);
1091
1092     return true;
1093 }
1094
1095 bool ast_unary_codegen(ast_unary *self, ast_function *func, bool lvalue, ir_value **out)
1096 {
1097     ast_expression_codegen *cgen;
1098     ir_value *operand;
1099
1100     /* In the context of a unary operation, we can disregard
1101      * the lvalue flag.
1102      */
1103     (void)lvalue;
1104     if (self->expression.outr) {
1105         *out = self->expression.outr;
1106         return true;
1107     }
1108
1109     cgen = self->operand->expression.codegen;
1110     /* lvalue! */
1111     if (!(*cgen)((ast_expression*)(self->operand), func, false, &operand))
1112         return false;
1113
1114     *out = ir_block_create_unary(func->curblock, ast_function_label(func, "unary"),
1115                                  self->op, operand);
1116     if (!*out)
1117         return false;
1118     self->expression.outr = *out;
1119
1120     return true;
1121 }
1122
1123 bool ast_return_codegen(ast_return *self, ast_function *func, bool lvalue, ir_value **out)
1124 {
1125     ast_expression_codegen *cgen;
1126     ir_value *operand;
1127
1128     /* In the context of a return operation, we can disregard
1129      * the lvalue flag.
1130      */
1131     (void)lvalue;
1132     if (self->expression.outr) {
1133         asterror(ast_ctx(self), "internal error: ast_return cannot be reused, it bears no result!\n");
1134         return false;
1135     }
1136     self->expression.outr = (ir_value*)1;
1137
1138     cgen = self->operand->expression.codegen;
1139     /* lvalue! */
1140     if (!(*cgen)((ast_expression*)(self->operand), func, false, &operand))
1141         return false;
1142
1143     if (!ir_block_create_return(func->curblock, operand))
1144         return false;
1145
1146     return true;
1147 }
1148
1149 bool ast_entfield_codegen(ast_entfield *self, ast_function *func, bool lvalue, ir_value **out)
1150 {
1151     ast_expression_codegen *cgen;
1152     ir_value *ent, *field;
1153
1154     /* This function needs to take the 'lvalue' flag into account!
1155      * As lvalue we provide a field-pointer, as rvalue we provide the
1156      * value in a temp.
1157      */
1158
1159     if (lvalue && self->expression.outl) {
1160         *out = self->expression.outl;
1161         return true;
1162     }
1163
1164     if (!lvalue && self->expression.outr) {
1165         *out = self->expression.outr;
1166         return true;
1167     }
1168
1169     cgen = self->entity->expression.codegen;
1170     if (!(*cgen)((ast_expression*)(self->entity), func, false, &ent))
1171         return false;
1172
1173     cgen = self->field->expression.codegen;
1174     if (!(*cgen)((ast_expression*)(self->field), func, false, &field))
1175         return false;
1176
1177     if (lvalue) {
1178         /* address! */
1179         *out = ir_block_create_fieldaddress(func->curblock, ast_function_label(func, "efa"),
1180                                             ent, field);
1181     } else {
1182         *out = ir_block_create_load_from_ent(func->curblock, ast_function_label(func, "efv"),
1183                                              ent, field, self->expression.vtype);
1184     }
1185     if (!*out) {
1186         asterror(ast_ctx(self), "failed to create %s instruction (output type %s)",
1187                  (lvalue ? "ADDRESS" : "FIELD"),
1188                  type_name[self->expression.vtype]);
1189         return false;
1190     }
1191
1192     if (lvalue)
1193         self->expression.outl = *out;
1194     else
1195         self->expression.outr = *out;
1196
1197     /* Hm that should be it... */
1198     return true;
1199 }
1200
1201 bool ast_member_codegen(ast_member *self, ast_function *func, bool lvalue, ir_value **out)
1202 {
1203     ast_expression_codegen *cgen;
1204     ir_value *vec;
1205
1206     /* in QC this is always an lvalue */
1207     (void)lvalue;
1208     if (self->expression.outl) {
1209         *out = self->expression.outl;
1210         return true;
1211     }
1212
1213     cgen = self->owner->expression.codegen;
1214     if (!(*cgen)((ast_expression*)(self->owner), func, true, &vec))
1215         return false;
1216
1217     if (vec->vtype != TYPE_VECTOR &&
1218         !(vec->vtype == TYPE_FIELD && self->owner->expression.next->expression.vtype == TYPE_VECTOR))
1219     {
1220         return false;
1221     }
1222
1223     *out = ir_value_vector_member(vec, self->field);
1224     self->expression.outl = *out;
1225
1226     return (*out != NULL);
1227 }
1228
1229 bool ast_ifthen_codegen(ast_ifthen *self, ast_function *func, bool lvalue, ir_value **out)
1230 {
1231     ast_expression_codegen *cgen;
1232
1233     ir_value *condval;
1234     ir_value *dummy;
1235
1236     ir_block *cond = func->curblock;
1237     ir_block *ontrue;
1238     ir_block *onfalse;
1239     ir_block *merge;
1240
1241     /* We don't output any value, thus also don't care about r/lvalue */
1242     (void)out;
1243     (void)lvalue;
1244
1245     if (self->expression.outr) {
1246         asterror(ast_ctx(self), "internal error: ast_ifthen cannot be reused, it bears no result!\n");
1247         return false;
1248     }
1249     self->expression.outr = (ir_value*)1;
1250
1251     /* generate the condition */
1252     func->curblock = cond;
1253     cgen = self->cond->expression.codegen;
1254     if (!(*cgen)((ast_expression*)(self->cond), func, false, &condval))
1255         return false;
1256
1257     /* on-true path */
1258
1259     if (self->on_true) {
1260         /* create on-true block */
1261         ontrue = ir_function_create_block(func->ir_func, ast_function_label(func, "ontrue"));
1262         if (!ontrue)
1263             return false;
1264
1265         /* enter the block */
1266         func->curblock = ontrue;
1267
1268         /* generate */
1269         cgen = self->on_true->expression.codegen;
1270         if (!(*cgen)((ast_expression*)(self->on_true), func, false, &dummy))
1271             return false;
1272     } else
1273         ontrue = NULL;
1274
1275     /* on-false path */
1276     if (self->on_false) {
1277         /* create on-false block */
1278         onfalse = ir_function_create_block(func->ir_func, ast_function_label(func, "onfalse"));
1279         if (!onfalse)
1280             return false;
1281
1282         /* enter the block */
1283         func->curblock = onfalse;
1284
1285         /* generate */
1286         cgen = self->on_false->expression.codegen;
1287         if (!(*cgen)((ast_expression*)(self->on_false), func, false, &dummy))
1288             return false;
1289     } else
1290         onfalse = NULL;
1291
1292     /* Merge block were they all merge in to */
1293     merge = ir_function_create_block(func->ir_func, ast_function_label(func, "endif"));
1294     if (!merge)
1295         return false;
1296
1297     /* add jumps ot the merge block */
1298     if (ontrue && !ir_block_create_jump(ontrue, merge))
1299         return false;
1300     if (onfalse && !ir_block_create_jump(onfalse, merge))
1301         return false;
1302
1303     /* we create the if here, that way all blocks are ordered :)
1304      */
1305     if (!ir_block_create_if(cond, condval,
1306                             (ontrue  ? ontrue  : merge),
1307                             (onfalse ? onfalse : merge)))
1308     {
1309         return false;
1310     }
1311
1312     /* Now enter the merge block */
1313     func->curblock = merge;
1314
1315     return true;
1316 }
1317
1318 bool ast_ternary_codegen(ast_ternary *self, ast_function *func, bool lvalue, ir_value **out)
1319 {
1320     ast_expression_codegen *cgen;
1321
1322     ir_value *condval;
1323     ir_value *trueval, *falseval;
1324     ir_instr *phi;
1325
1326     ir_block *cond = func->curblock;
1327     ir_block *ontrue;
1328     ir_block *onfalse;
1329     ir_block *merge;
1330
1331     /* Ternary can never create an lvalue... */
1332     if (lvalue)
1333         return false;
1334
1335     /* In theory it shouldn't be possible to pass through a node twice, but
1336      * in case we add any kind of optimization pass for the AST itself, it
1337      * may still happen, thus we remember a created ir_value and simply return one
1338      * if it already exists.
1339      */
1340     if (self->phi_out) {
1341         *out = self->phi_out;
1342         return true;
1343     }
1344
1345     /* In the following, contraty to ast_ifthen, we assume both paths exist. */
1346
1347     /* generate the condition */
1348     func->curblock = cond;
1349     cgen = self->cond->expression.codegen;
1350     if (!(*cgen)((ast_expression*)(self->cond), func, false, &condval))
1351         return false;
1352
1353     /* create on-true block */
1354     ontrue = ir_function_create_block(func->ir_func, ast_function_label(func, "tern_T"));
1355     if (!ontrue)
1356         return false;
1357     else
1358     {
1359         /* enter the block */
1360         func->curblock = ontrue;
1361
1362         /* generate */
1363         cgen = self->on_true->expression.codegen;
1364         if (!(*cgen)((ast_expression*)(self->on_true), func, false, &trueval))
1365             return false;
1366     }
1367
1368     /* create on-false block */
1369     onfalse = ir_function_create_block(func->ir_func, ast_function_label(func, "tern_F"));
1370     if (!onfalse)
1371         return false;
1372     else
1373     {
1374         /* enter the block */
1375         func->curblock = onfalse;
1376
1377         /* generate */
1378         cgen = self->on_false->expression.codegen;
1379         if (!(*cgen)((ast_expression*)(self->on_false), func, false, &falseval))
1380             return false;
1381     }
1382
1383     /* create merge block */
1384     merge = ir_function_create_block(func->ir_func, ast_function_label(func, "tern_out"));
1385     if (!merge)
1386         return false;
1387     /* jump to merge block */
1388     if (!ir_block_create_jump(ontrue, merge))
1389         return false;
1390     if (!ir_block_create_jump(onfalse, merge))
1391         return false;
1392
1393     /* create if instruction */
1394     if (!ir_block_create_if(cond, condval, ontrue, onfalse))
1395         return false;
1396
1397     /* Now enter the merge block */
1398     func->curblock = merge;
1399
1400     /* Here, now, we need a PHI node
1401      * but first some sanity checking...
1402      */
1403     if (trueval->vtype != falseval->vtype) {
1404         /* error("ternary with different types on the two sides"); */
1405         return false;
1406     }
1407
1408     /* create PHI */
1409     phi = ir_block_create_phi(merge, ast_function_label(func, "phi"), trueval->vtype);
1410     if (!phi ||
1411         !ir_phi_add(phi, ontrue,  trueval) ||
1412         !ir_phi_add(phi, onfalse, falseval))
1413     {
1414         return false;
1415     }
1416
1417     self->phi_out = ir_phi_value(phi);
1418     *out = self->phi_out;
1419
1420     return true;
1421 }
1422
1423 bool ast_loop_codegen(ast_loop *self, ast_function *func, bool lvalue, ir_value **out)
1424 {
1425     ast_expression_codegen *cgen;
1426
1427     ir_value *dummy      = NULL;
1428     ir_value *precond    = NULL;
1429     ir_value *postcond   = NULL;
1430
1431     /* Since we insert some jumps "late" so we have blocks
1432      * ordered "nicely", we need to keep track of the actual end-blocks
1433      * of expressions to add the jumps to.
1434      */
1435     ir_block *bbody      = NULL, *end_bbody      = NULL;
1436     ir_block *bprecond   = NULL, *end_bprecond   = NULL;
1437     ir_block *bpostcond  = NULL, *end_bpostcond  = NULL;
1438     ir_block *bincrement = NULL, *end_bincrement = NULL;
1439     ir_block *bout       = NULL, *bin            = NULL;
1440
1441     /* let's at least move the outgoing block to the end */
1442     size_t    bout_id;
1443
1444     /* 'break' and 'continue' need to be able to find the right blocks */
1445     ir_block *bcontinue     = NULL;
1446     ir_block *bbreak        = NULL;
1447
1448     ir_block *old_bcontinue = NULL;
1449     ir_block *old_bbreak    = NULL;
1450
1451     ir_block *tmpblock      = NULL;
1452
1453     (void)lvalue;
1454     (void)out;
1455
1456     if (self->expression.outr) {
1457         asterror(ast_ctx(self), "internal error: ast_loop cannot be reused, it bears no result!\n");
1458         return false;
1459     }
1460     self->expression.outr = (ir_value*)1;
1461
1462     /* NOTE:
1463      * Should we ever need some kind of block ordering, better make this function
1464      * move blocks around than write a block ordering algorithm later... after all
1465      * the ast and ir should work together, not against each other.
1466      */
1467
1468     /* initexpr doesn't get its own block, it's pointless, it could create more blocks
1469      * anyway if for example it contains a ternary.
1470      */
1471     if (self->initexpr)
1472     {
1473         cgen = self->initexpr->expression.codegen;
1474         if (!(*cgen)((ast_expression*)(self->initexpr), func, false, &dummy))
1475             return false;
1476     }
1477
1478     /* Store the block from which we enter this chaos */
1479     bin = func->curblock;
1480
1481     /* The pre-loop condition needs its own block since we
1482      * need to be able to jump to the start of that expression.
1483      */
1484     if (self->precond)
1485     {
1486         bprecond = ir_function_create_block(func->ir_func, ast_function_label(func, "pre_loop_cond"));
1487         if (!bprecond)
1488             return false;
1489
1490         /* the pre-loop-condition the least important place to 'continue' at */
1491         bcontinue = bprecond;
1492
1493         /* enter */
1494         func->curblock = bprecond;
1495
1496         /* generate */
1497         cgen = self->precond->expression.codegen;
1498         if (!(*cgen)((ast_expression*)(self->precond), func, false, &precond))
1499             return false;
1500
1501         end_bprecond = func->curblock;
1502     } else {
1503         bprecond = end_bprecond = NULL;
1504     }
1505
1506     /* Now the next blocks won't be ordered nicely, but we need to
1507      * generate them this early for 'break' and 'continue'.
1508      */
1509     if (self->increment) {
1510         bincrement = ir_function_create_block(func->ir_func, ast_function_label(func, "loop_increment"));
1511         if (!bincrement)
1512             return false;
1513         bcontinue = bincrement; /* increment comes before the pre-loop-condition */
1514     } else {
1515         bincrement = end_bincrement = NULL;
1516     }
1517
1518     if (self->postcond) {
1519         bpostcond = ir_function_create_block(func->ir_func, ast_function_label(func, "post_loop_cond"));
1520         if (!bpostcond)
1521             return false;
1522         bcontinue = bpostcond; /* postcond comes before the increment */
1523     } else {
1524         bpostcond = end_bpostcond = NULL;
1525     }
1526
1527     bout_id = func->ir_func->blocks_count;
1528     bout = ir_function_create_block(func->ir_func, ast_function_label(func, "after_loop"));
1529     if (!bout)
1530         return false;
1531     bbreak = bout;
1532
1533     /* The loop body... */
1534     if (self->body)
1535     {
1536         bbody = ir_function_create_block(func->ir_func, ast_function_label(func, "loop_body"));
1537         if (!bbody)
1538             return false;
1539
1540         /* enter */
1541         func->curblock = bbody;
1542
1543         old_bbreak          = func->breakblock;
1544         old_bcontinue       = func->continueblock;
1545         func->breakblock    = bbreak;
1546         func->continueblock = bcontinue;
1547
1548         /* generate */
1549         cgen = self->body->expression.codegen;
1550         if (!(*cgen)((ast_expression*)(self->body), func, false, &dummy))
1551             return false;
1552
1553         end_bbody = func->curblock;
1554         func->breakblock    = old_bbreak;
1555         func->continueblock = old_bcontinue;
1556     }
1557
1558     /* post-loop-condition */
1559     if (self->postcond)
1560     {
1561         /* enter */
1562         func->curblock = bpostcond;
1563
1564         /* generate */
1565         cgen = self->postcond->expression.codegen;
1566         if (!(*cgen)((ast_expression*)(self->postcond), func, false, &postcond))
1567             return false;
1568
1569         end_bpostcond = func->curblock;
1570     }
1571
1572     /* The incrementor */
1573     if (self->increment)
1574     {
1575         /* enter */
1576         func->curblock = bincrement;
1577
1578         /* generate */
1579         cgen = self->increment->expression.codegen;
1580         if (!(*cgen)((ast_expression*)(self->increment), func, false, &dummy))
1581             return false;
1582
1583         end_bincrement = func->curblock;
1584     }
1585
1586     /* In any case now, we continue from the outgoing block */
1587     func->curblock = bout;
1588
1589     /* Now all blocks are in place */
1590     /* From 'bin' we jump to whatever comes first */
1591     if      (bprecond)   tmpblock = bprecond;
1592     else if (bbody)      tmpblock = bbody;
1593     else if (bpostcond)  tmpblock = bpostcond;
1594     else                 tmpblock = bout;
1595     if (!ir_block_create_jump(bin, tmpblock))
1596         return false;
1597
1598     /* From precond */
1599     if (bprecond)
1600     {
1601         ir_block *ontrue, *onfalse;
1602         if      (bbody)      ontrue = bbody;
1603         else if (bincrement) ontrue = bincrement;
1604         else if (bpostcond)  ontrue = bpostcond;
1605         else                 ontrue = bprecond;
1606         onfalse = bout;
1607         if (!ir_block_create_if(end_bprecond, precond, ontrue, onfalse))
1608             return false;
1609     }
1610
1611     /* from body */
1612     if (bbody)
1613     {
1614         if      (bincrement) tmpblock = bincrement;
1615         else if (bpostcond)  tmpblock = bpostcond;
1616         else if (bprecond)   tmpblock = bprecond;
1617         else                 tmpblock = bout;
1618         if (!ir_block_create_jump(end_bbody, tmpblock))
1619             return false;
1620     }
1621
1622     /* from increment */
1623     if (bincrement)
1624     {
1625         if      (bpostcond)  tmpblock = bpostcond;
1626         else if (bprecond)   tmpblock = bprecond;
1627         else if (bbody)      tmpblock = bbody;
1628         else                 tmpblock = bout;
1629         if (!ir_block_create_jump(end_bincrement, tmpblock))
1630             return false;
1631     }
1632
1633     /* from postcond */
1634     if (bpostcond)
1635     {
1636         ir_block *ontrue, *onfalse;
1637         if      (bprecond)   ontrue = bprecond;
1638         else if (bbody)      ontrue = bbody;
1639         else if (bincrement) ontrue = bincrement;
1640         else                 ontrue = bpostcond;
1641         onfalse = bout;
1642         if (!ir_block_create_if(end_bpostcond, postcond, ontrue, onfalse))
1643             return false;
1644     }
1645
1646     /* Move 'bout' to the end */
1647     if (!ir_function_blocks_remove(func->ir_func, bout_id) ||
1648         !ir_function_blocks_add(func->ir_func, bout))
1649     {
1650         ir_block_delete(bout);
1651         return false;
1652     }
1653
1654     return true;
1655 }
1656
1657 bool ast_call_codegen(ast_call *self, ast_function *func, bool lvalue, ir_value **out)
1658 {
1659     ast_expression_codegen *cgen;
1660     ir_value_vector         params;
1661     ir_instr               *callinstr;
1662     size_t i;
1663
1664     ir_value *funval = NULL;
1665
1666     /* return values are never lvalues */
1667     (void)lvalue;
1668
1669     if (self->expression.outr) {
1670         *out = self->expression.outr;
1671         return true;
1672     }
1673
1674     cgen = self->func->expression.codegen;
1675     if (!(*cgen)((ast_expression*)(self->func), func, false, &funval))
1676         return false;
1677     if (!funval)
1678         return false;
1679
1680     MEM_VECTOR_INIT(&params, v);
1681
1682     /* parameters */
1683     for (i = 0; i < self->params_count; ++i)
1684     {
1685         ir_value *param;
1686         ast_expression *expr = self->params[i];
1687
1688         cgen = expr->expression.codegen;
1689         if (!(*cgen)(expr, func, false, &param))
1690             goto error;
1691         if (!param)
1692             goto error;
1693         if (!ir_value_vector_v_add(&params, param))
1694             goto error;
1695     }
1696
1697     callinstr = ir_block_create_call(func->curblock, ast_function_label(func, "call"), funval);
1698     if (!callinstr)
1699         goto error;
1700
1701     for (i = 0; i < params.v_count; ++i) {
1702         if (!ir_call_param(callinstr, params.v[i]))
1703             goto error;
1704     }
1705
1706     *out = ir_call_value(callinstr);
1707     self->expression.outr = *out;
1708
1709     MEM_VECTOR_CLEAR(&params, v);
1710     return true;
1711 error:
1712     MEM_VECTOR_CLEAR(&params, v);
1713     return false;
1714 }