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