dlls/vbscript/compile.c

   1 /*
   2  * Copyright 2011 Jacek Caban for CodeWeavers
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  */
  18
  19 #include <assert.h>
  20
  21 #include "vbscript.h"
  22 #include "parse.h"
  23 #include "parser.tab.h"
  24
  25 #include "wine/debug.h"
  26
  27 WINE_DEFAULT_DEBUG_CHANNEL(vbscript);
  28 WINE_DECLARE_DEBUG_CHANNEL(vbscript_disas);
  29
  30 typedef struct {
  31     parser_ctx_t parser;
  32
  33     unsigned instr_cnt;
  34     unsigned instr_size;
  35     vbscode_t *code;
  36
  37     unsigned *labels;
  38     unsigned labels_size;
  39     unsigned labels_cnt;
  40
  41     unsigned while_end_label;
  42     unsigned for_end_label;
  43     unsigned sub_end_label;
  44     unsigned func_end_label;
  45     unsigned prop_end_label;
  46
  47     dim_decl_t *dim_decls;
  48     dynamic_var_t *global_vars;
  49
  50     const_decl_t *const_decls;
  51     const_decl_t *global_consts;
  52
  53     function_t *func;
  54     function_t *funcs;
  55     function_decl_t *func_decls;
  56
  57     class_desc_t *classes;
  58 } compile_ctx_t;
  59
  60 static HRESULT compile_expression(compile_ctx_t*,expression_t*);
  61 static HRESULT compile_statement(compile_ctx_t*,statement_t*);
  62
  63 static const struct {
  64     const char *op_str;
  65     instr_arg_type_t arg1_type;
  66     instr_arg_type_t arg2_type;
  67 } instr_info[] = {
  68 #define X(n,a,b,c) {#n,b,c},
  69 OP_LIST
  70 #undef X
  71 };
  72
  73 static void dump_instr_arg(instr_arg_type_t type, instr_arg_t *arg)
  74 {
  75     switch(type) {
  76     case ARG_STR:
  77     case ARG_BSTR:
  78         TRACE_(vbscript_disas)("\t%s", debugstr_w(arg->str));
  79         break;
  80     case ARG_INT:
  81         TRACE_(vbscript_disas)("\t%d", arg->uint);
  82         break;
  83     case ARG_UINT:
  84     case ARG_ADDR:
  85         TRACE_(vbscript_disas)("\t%u", arg->uint);
  86         break;
  87     case ARG_DOUBLE:
  88         TRACE_(vbscript_disas)("\t%lf", *arg->dbl);
  89         break;
  90     case ARG_NONE:
  91         break;
  92     default:
  93         assert(0);
  94     }
  95 }
  96
  97 static void dump_code(compile_ctx_t *ctx)
  98 {
  99     instr_t *instr;
 100
 101     for(instr = ctx->code->instrs; instr < ctx->code->instrs+ctx->instr_cnt; instr++) {
 102         TRACE_(vbscript_disas)("%d:\t%s", (int)(instr-ctx->code->instrs), instr_info[instr->op].op_str);
 103         dump_instr_arg(instr_info[instr->op].arg1_type, &instr->arg1);
 104         dump_instr_arg(instr_info[instr->op].arg2_type, &instr->arg2);
 105         TRACE_(vbscript_disas)("\n");
 106     }
 107 }
 108
 109 static inline void *compiler_alloc(vbscode_t *vbscode, size_t size)
 110 {
 111     return vbsheap_alloc(&vbscode->heap, size);
 112 }
 113
 114 static inline void *compiler_alloc_zero(vbscode_t *vbscode, size_t size)
 115 {
 116     void *ret;
 117
 118     ret = vbsheap_alloc(&vbscode->heap, size);
 119     if(ret)
 120         memset(ret, 0, size);
 121     return ret;
 122 }
 123
 124 static WCHAR *compiler_alloc_string(vbscode_t *vbscode, const WCHAR *str)
 125 {
 126     size_t size;
 127     WCHAR *ret;
 128
 129     size = (strlenW(str)+1)*sizeof(WCHAR);
 130     ret = compiler_alloc(vbscode, size);
 131     if(ret)
 132         memcpy(ret, str, size);
 133     return ret;
 134 }
 135
 136 static inline instr_t *instr_ptr(compile_ctx_t *ctx, unsigned id)
 137 {
 138     assert(id < ctx->instr_cnt);
 139     return ctx->code->instrs + id;
 140 }
 141
 142 static unsigned push_instr(compile_ctx_t *ctx, vbsop_t op)
 143 {
 144     assert(ctx->instr_size && ctx->instr_size >= ctx->instr_cnt);
 145
 146     if(ctx->instr_size == ctx->instr_cnt) {
 147         instr_t *new_instr;
 148
 149         new_instr = heap_realloc(ctx->code->instrs, ctx->instr_size*2*sizeof(instr_t));
 150         if(!new_instr)
 151             return -1;
 152
 153         ctx->code->instrs = new_instr;
 154         ctx->instr_size *= 2;
 155     }
 156
 157     ctx->code->instrs[ctx->instr_cnt].op = op;
 158     return ctx->instr_cnt++;
 159 }
 160
 161 static HRESULT push_instr_int(compile_ctx_t *ctx, vbsop_t op, LONG arg)
 162 {
 163     unsigned ret;
 164
 165     ret = push_instr(ctx, op);
 166     if(ret == -1)
 167         return E_OUTOFMEMORY;
 168
 169     instr_ptr(ctx, ret)->arg1.lng = arg;
 170     return S_OK;
 171 }
 172
 173 static HRESULT push_instr_uint(compile_ctx_t *ctx, vbsop_t op, unsigned arg)
 174 {
 175     unsigned ret;
 176
 177     ret = push_instr(ctx, op);
 178     if(ret == -1)
 179         return E_OUTOFMEMORY;
 180
 181     instr_ptr(ctx, ret)->arg1.uint = arg;
 182     return S_OK;
 183 }
 184
 185 static HRESULT push_instr_addr(compile_ctx_t *ctx, vbsop_t op, unsigned arg)
 186 {
 187     unsigned ret;
 188
 189     ret = push_instr(ctx, op);
 190     if(ret == -1)
 191         return E_OUTOFMEMORY;
 192
 193     instr_ptr(ctx, ret)->arg1.uint = arg;
 194     return S_OK;
 195 }
 196
 197 static HRESULT push_instr_str(compile_ctx_t *ctx, vbsop_t op, const WCHAR *arg)
 198 {
 199     unsigned instr;
 200     WCHAR *str;
 201
 202     str = compiler_alloc_string(ctx->code, arg);
 203     if(!str)
 204         return E_OUTOFMEMORY;
 205
 206     instr = push_instr(ctx, op);
 207     if(instr == -1)
 208         return E_OUTOFMEMORY;
 209
 210     instr_ptr(ctx, instr)->arg1.str = str;
 211     return S_OK;
 212 }
 213
 214 static HRESULT push_instr_double(compile_ctx_t *ctx, vbsop_t op, double arg)
 215 {
 216     unsigned instr;
 217     double *d;
 218
 219     d = compiler_alloc(ctx->code, sizeof(double));
 220     if(!d)
 221         return E_OUTOFMEMORY;
 222
 223     instr = push_instr(ctx, op);
 224     if(instr == -1)
 225         return E_OUTOFMEMORY;
 226
 227     *d = arg;
 228     instr_ptr(ctx, instr)->arg1.dbl = d;
 229     return S_OK;
 230 }
 231
 232 static BSTR alloc_bstr_arg(compile_ctx_t *ctx, const WCHAR *str)
 233 {
 234     if(!ctx->code->bstr_pool_size) {
 235         ctx->code->bstr_pool = heap_alloc(8 * sizeof(BSTR));
 236         if(!ctx->code->bstr_pool)
 237             return NULL;
 238         ctx->code->bstr_pool_size = 8;
 239     }else if(ctx->code->bstr_pool_size == ctx->code->bstr_cnt) {
 240         BSTR *new_pool;
 241
 242         new_pool = heap_realloc(ctx->code->bstr_pool, ctx->code->bstr_pool_size*2*sizeof(BSTR));
 243         if(!new_pool)
 244             return NULL;
 245
 246         ctx->code->bstr_pool = new_pool;
 247         ctx->code->bstr_pool_size *= 2;
 248     }
 249
 250     ctx->code->bstr_pool[ctx->code->bstr_cnt] = SysAllocString(str);
 251     if(!ctx->code->bstr_pool[ctx->code->bstr_cnt])
 252         return NULL;
 253
 254     return ctx->code->bstr_pool[ctx->code->bstr_cnt++];
 255 }
 256
 257 static HRESULT push_instr_bstr(compile_ctx_t *ctx, vbsop_t op, const WCHAR *arg)
 258 {
 259     unsigned instr;
 260     BSTR bstr;
 261
 262     bstr = alloc_bstr_arg(ctx, arg);
 263     if(!bstr)
 264         return E_OUTOFMEMORY;
 265
 266     instr = push_instr(ctx, op);
 267     if(instr == -1)
 268         return E_OUTOFMEMORY;
 269
 270     instr_ptr(ctx, instr)->arg1.bstr = bstr;
 271     return S_OK;
 272 }
 273
 274 static HRESULT push_instr_bstr_uint(compile_ctx_t *ctx, vbsop_t op, const WCHAR *arg1, unsigned arg2)
 275 {
 276     unsigned instr;
 277     BSTR bstr;
 278
 279     bstr = alloc_bstr_arg(ctx, arg1);
 280     if(!bstr)
 281         return E_OUTOFMEMORY;
 282
 283     instr = push_instr(ctx, op);
 284     if(instr == -1)
 285         return E_OUTOFMEMORY;
 286
 287     instr_ptr(ctx, instr)->arg1.bstr = bstr;
 288     instr_ptr(ctx, instr)->arg2.uint = arg2;
 289     return S_OK;
 290 }
 291
 292 #define LABEL_FLAG 0x80000000
 293
 294 static unsigned alloc_label(compile_ctx_t *ctx)
 295 {
 296     if(!ctx->labels_size) {
 297         ctx->labels = heap_alloc(8 * sizeof(*ctx->labels));
 298         if(!ctx->labels)
 299             return -1;
 300         ctx->labels_size = 8;
 301     }else if(ctx->labels_size == ctx->labels_cnt) {
 302         unsigned *new_labels;
 303
 304         new_labels = heap_realloc(ctx->labels, 2*ctx->labels_size*sizeof(*ctx->labels));
 305         if(!new_labels)
 306             return -1;
 307
 308         ctx->labels = new_labels;
 309         ctx->labels_size *= 2;
 310     }
 311
 312     return ctx->labels_cnt++ | LABEL_FLAG;
 313 }
 314
 315 static inline void label_set_addr(compile_ctx_t *ctx, unsigned label)
 316 {
 317     assert(label & LABEL_FLAG);
 318     ctx->labels[label & ~LABEL_FLAG] = ctx->instr_cnt;
 319 }
 320
 321 static expression_t *lookup_const_decls(compile_ctx_t *ctx, const WCHAR *name, BOOL lookup_global)
 322 {
 323     const_decl_t *decl;
 324
 325     for(decl = ctx->const_decls; decl; decl = decl->next) {
 326         if(!strcmpiW(decl->name, name))
 327             return decl->value_expr;
 328     }
 329
 330     if(!lookup_global)
 331         return NULL;
 332
 333     for(decl = ctx->global_consts; decl; decl = decl->next) {
 334         if(!strcmpiW(decl->name, name))
 335             return decl->value_expr;
 336     }
 337
 338     return NULL;
 339 }
 340
 341 static HRESULT compile_args(compile_ctx_t *ctx, expression_t *args, unsigned *ret)
 342 {
 343     unsigned arg_cnt = 0;
 344     HRESULT hres;
 345
 346     while(args) {
 347         hres = compile_expression(ctx, args);
 348         if(FAILED(hres))
 349             return hres;
 350
 351         arg_cnt++;
 352         args = args->next;
 353     }
 354
 355     *ret = arg_cnt;
 356     return S_OK;
 357 }
 358
 359 static HRESULT compile_member_expression(compile_ctx_t *ctx, member_expression_t *expr, BOOL ret_val)
 360 {
 361     unsigned arg_cnt = 0;
 362     HRESULT hres;
 363
 364     if(ret_val && !expr->args) {
 365         expression_t *const_expr;
 366
 367         const_expr = lookup_const_decls(ctx, expr->identifier, TRUE);
 368         if(const_expr)
 369             return compile_expression(ctx, const_expr);
 370     }
 371
 372     hres = compile_args(ctx, expr->args, &arg_cnt);
 373     if(FAILED(hres))
 374         return hres;
 375
 376     if(expr->obj_expr) {
 377         hres = compile_expression(ctx, expr->obj_expr);
 378         if(FAILED(hres))
 379             return hres;
 380
 381         hres = push_instr_bstr_uint(ctx, ret_val ? OP_mcall : OP_mcallv, expr->identifier, arg_cnt);
 382     }else {
 383         hres = push_instr_bstr_uint(ctx, ret_val ? OP_icall : OP_icallv, expr->identifier, arg_cnt);
 384     }
 385
 386     return hres;
 387 }
 388
 389 static HRESULT compile_unary_expression(compile_ctx_t *ctx, unary_expression_t *expr, vbsop_t op)
 390 {
 391     HRESULT hres;
 392
 393     hres = compile_expression(ctx, expr->subexpr);
 394     if(FAILED(hres))
 395         return hres;
 396
 397     return push_instr(ctx, op) == -1 ? E_OUTOFMEMORY : S_OK;
 398 }
 399
 400 static HRESULT compile_binary_expression(compile_ctx_t *ctx, binary_expression_t *expr, vbsop_t op)
 401 {
 402     HRESULT hres;
 403
 404     hres = compile_expression(ctx, expr->left);
 405     if(FAILED(hres))
 406         return hres;
 407
 408     hres = compile_expression(ctx, expr->right);
 409     if(FAILED(hres))
 410         return hres;
 411
 412     return push_instr(ctx, op) == -1 ? E_OUTOFMEMORY : S_OK;
 413 }
 414
 415 static HRESULT compile_expression(compile_ctx_t *ctx, expression_t *expr)
 416 {
 417     switch(expr->type) {
 418     case EXPR_ADD:
 419         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_add);
 420     case EXPR_AND:
 421         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_and);
 422     case EXPR_BOOL:
 423         return push_instr_int(ctx, OP_bool, ((bool_expression_t*)expr)->value);
 424     case EXPR_CONCAT:
 425         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_concat);
 426     case EXPR_DIV:
 427         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_div);
 428     case EXPR_DOUBLE:
 429         return push_instr_double(ctx, OP_double, ((double_expression_t*)expr)->value);
 430     case EXPR_EMPTY:
 431         return push_instr(ctx, OP_empty) != -1 ? S_OK : E_OUTOFMEMORY;
 432     case EXPR_EQUAL:
 433         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_equal);
 434     case EXPR_EQV:
 435         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_eqv);
 436     case EXPR_EXP:
 437         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_exp);
 438     case EXPR_GT:
 439         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_gt);
 440     case EXPR_GTEQ:
 441         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_gteq);
 442     case EXPR_IDIV:
 443         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_idiv);
 444     case EXPR_IS:
 445         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_is);
 446     case EXPR_IMP:
 447         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_imp);
 448     case EXPR_LT:
 449         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_lt);
 450     case EXPR_LTEQ:
 451         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_lteq);
 452     case EXPR_ME:
 453         return push_instr(ctx, OP_me) != -1 ? S_OK : E_OUTOFMEMORY;
 454     case EXPR_MEMBER:
 455         return compile_member_expression(ctx, (member_expression_t*)expr, TRUE);
 456     case EXPR_MOD:
 457         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_mod);
 458     case EXPR_MUL:
 459         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_mul);
 460     case EXPR_NEG:
 461         return compile_unary_expression(ctx, (unary_expression_t*)expr, OP_neg);
 462     case EXPR_NEQUAL:
 463         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_nequal);
 464     case EXPR_NEW:
 465         return push_instr_str(ctx, OP_new, ((string_expression_t*)expr)->value);
 466     case EXPR_NOT:
 467         return compile_unary_expression(ctx, (unary_expression_t*)expr, OP_not);
 468     case EXPR_NOTHING:
 469         return push_instr(ctx, OP_nothing) != -1 ? S_OK : E_OUTOFMEMORY;
 470     case EXPR_NULL:
 471         return push_instr(ctx, OP_null) != -1 ? S_OK : E_OUTOFMEMORY;
 472     case EXPR_OR:
 473         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_or);
 474     case EXPR_STRING:
 475         return push_instr_str(ctx, OP_string, ((string_expression_t*)expr)->value);
 476     case EXPR_SUB:
 477         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_sub);
 478     case EXPR_USHORT:
 479         return push_instr_int(ctx, OP_short, ((int_expression_t*)expr)->value);
 480     case EXPR_ULONG:
 481         return push_instr_int(ctx, OP_long, ((int_expression_t*)expr)->value);
 482     case EXPR_XOR:
 483         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_xor);
 484     default:
 485         FIXME("Unimplemented expression type %d\n", expr->type);
 486         return E_NOTIMPL;
 487     }
 488
 489     return S_OK;
 490 }
 491
 492 static HRESULT compile_if_statement(compile_ctx_t *ctx, if_statement_t *stat)
 493 {
 494     unsigned cnd_jmp, endif_label = -1;
 495     elseif_decl_t *elseif_decl;
 496     HRESULT hres;
 497
 498     hres = compile_expression(ctx, stat->expr);
 499     if(FAILED(hres))
 500         return hres;
 501
 502     cnd_jmp = push_instr(ctx, OP_jmp_false);
 503     if(cnd_jmp == -1)
 504         return E_OUTOFMEMORY;
 505
 506     hres = compile_statement(ctx, stat->if_stat);
 507     if(FAILED(hres))
 508         return hres;
 509
 510     if(stat->else_stat || stat->elseifs) {
 511         endif_label = alloc_label(ctx);
 512         if(endif_label == -1)
 513             return E_OUTOFMEMORY;
 514
 515         hres = push_instr_addr(ctx, OP_jmp, endif_label);
 516         if(FAILED(hres))
 517             return hres;
 518     }
 519
 520     for(elseif_decl = stat->elseifs; elseif_decl; elseif_decl = elseif_decl->next) {
 521         instr_ptr(ctx, cnd_jmp)->arg1.uint = ctx->instr_cnt;
 522
 523         hres = compile_expression(ctx, elseif_decl->expr);
 524         if(FAILED(hres))
 525             return hres;
 526
 527         cnd_jmp = push_instr(ctx, OP_jmp_false);
 528         if(cnd_jmp == -1)
 529             return E_OUTOFMEMORY;
 530
 531         hres = compile_statement(ctx, elseif_decl->stat);
 532         if(FAILED(hres))
 533             return hres;
 534
 535         hres = push_instr_addr(ctx, OP_jmp, endif_label);
 536         if(FAILED(hres))
 537             return hres;
 538     }
 539
 540     instr_ptr(ctx, cnd_jmp)->arg1.uint = ctx->instr_cnt;
 541
 542     if(stat->else_stat) {
 543         hres = compile_statement(ctx, stat->else_stat);
 544         if(FAILED(hres))
 545             return hres;
 546     }
 547
 548     if(endif_label != -1)
 549         label_set_addr(ctx, endif_label);
 550     return S_OK;
 551 }
 552
 553 static HRESULT compile_while_statement(compile_ctx_t *ctx, while_statement_t *stat)
 554 {
 555     unsigned start_addr, prev_label;
 556     unsigned jmp_end;
 557     HRESULT hres;
 558
 559     start_addr = ctx->instr_cnt;
 560
 561     hres = compile_expression(ctx, stat->expr);
 562     if(FAILED(hres))
 563         return hres;
 564
 565     jmp_end = push_instr(ctx, stat->stat.type == STAT_UNTIL ? OP_jmp_true : OP_jmp_false);
 566     if(jmp_end == -1)
 567         return E_OUTOFMEMORY;
 568
 569     prev_label = ctx->while_end_label;
 570     if(stat->stat.type != STAT_WHILE && (ctx->while_end_label = alloc_label(ctx)) == -1)
 571         return E_OUTOFMEMORY;
 572
 573     hres = compile_statement(ctx, stat->body);
 574     if(FAILED(hres))
 575         return hres;
 576
 577     hres = push_instr_addr(ctx, OP_jmp, start_addr);
 578     if(FAILED(hres))
 579         return hres;
 580
 581     instr_ptr(ctx, jmp_end)->arg1.uint = ctx->instr_cnt;
 582
 583     if(stat->stat.type != STAT_WHILE) {
 584         label_set_addr(ctx, ctx->while_end_label);
 585         ctx->while_end_label = prev_label;
 586     }
 587
 588     return S_OK;
 589 }
 590
 591 static HRESULT compile_dowhile_statement(compile_ctx_t *ctx, while_statement_t *stat)
 592 {
 593     unsigned start_addr, prev_label;
 594     HRESULT hres;
 595
 596     start_addr = ctx->instr_cnt;
 597
 598     prev_label = ctx->while_end_label;
 599     if((ctx->while_end_label = alloc_label(ctx)) == -1)
 600         return E_OUTOFMEMORY;
 601
 602     hres = compile_statement(ctx, stat->body);
 603     if(FAILED(hres))
 604         return hres;
 605
 606     hres = compile_expression(ctx, stat->expr);
 607     if(FAILED(hres))
 608         return hres;
 609
 610     hres = push_instr_addr(ctx, stat->stat.type == STAT_DOUNTIL ? OP_jmp_false : OP_jmp_true, start_addr);
 611     if(FAILED(hres))
 612         return hres;
 613
 614     label_set_addr(ctx, ctx->while_end_label);
 615     ctx->while_end_label = prev_label;
 616     return S_OK;
 617 }
 618
 619 static HRESULT compile_forto_statement(compile_ctx_t *ctx, forto_statement_t *stat)
 620 {
 621     unsigned step_instr, instr, prev_label;
 622     BSTR identifier;
 623     HRESULT hres;
 624
 625     identifier = alloc_bstr_arg(ctx, stat->identifier);
 626     if(!identifier)
 627         return E_OUTOFMEMORY;
 628
 629     hres = compile_expression(ctx, stat->from_expr);
 630     if(FAILED(hres))
 631         return hres;
 632
 633     instr = push_instr(ctx, OP_assign_ident);
 634     if(instr == -1)
 635         return E_OUTOFMEMORY;
 636     instr_ptr(ctx, instr)->arg1.bstr = identifier;
 637
 638     hres = compile_expression(ctx, stat->to_expr);
 639     if(FAILED(hres))
 640         return hres;
 641
 642     if(push_instr(ctx, OP_val) == -1)
 643         return E_OUTOFMEMORY;
 644
 645     if(stat->step_expr) {
 646         hres = compile_expression(ctx, stat->step_expr);
 647         if(FAILED(hres))
 648             return hres;
 649
 650         if(push_instr(ctx, OP_val) == -1)
 651             return E_OUTOFMEMORY;
 652     }else {
 653         hres = push_instr_int(ctx, OP_short, 1);
 654         if(FAILED(hres))
 655             return hres;
 656     }
 657
 658     prev_label = ctx->for_end_label;
 659     ctx->for_end_label = alloc_label(ctx);
 660     if(ctx->for_end_label == -1)
 661         return E_OUTOFMEMORY;
 662
 663     step_instr = push_instr(ctx, OP_step);
 664     if(step_instr == -1)
 665         return E_OUTOFMEMORY;
 666     instr_ptr(ctx, step_instr)->arg2.bstr = identifier;
 667     instr_ptr(ctx, step_instr)->arg1.uint = ctx->for_end_label;
 668
 669     hres = compile_statement(ctx, stat->body);
 670     if(FAILED(hres))
 671         return hres;
 672
 673     instr = push_instr(ctx, OP_incc);
 674     if(instr == -1)
 675         return E_OUTOFMEMORY;
 676     instr_ptr(ctx, instr)->arg1.bstr = identifier;
 677
 678     hres = push_instr_addr(ctx, OP_jmp, step_instr);
 679     if(FAILED(hres))
 680         return hres;
 681
 682     label_set_addr(ctx, ctx->for_end_label);
 683     ctx->for_end_label = prev_label;
 684
 685     return push_instr_uint(ctx, OP_pop, 2);
 686 }
 687
 688 static HRESULT compile_assign_statement(compile_ctx_t *ctx, assign_statement_t *stat, BOOL is_set)
 689 {
 690     HRESULT hres;
 691
 692     hres = compile_expression(ctx, stat->value_expr);
 693     if(FAILED(hres))
 694         return hres;
 695
 696     if(stat->member_expr->args) {
 697         FIXME("arguments support not implemented\n");
 698         return E_NOTIMPL;
 699     }
 700
 701     if(stat->member_expr->obj_expr) {
 702         hres = compile_expression(ctx, stat->member_expr->obj_expr);
 703         if(FAILED(hres))
 704             return hres;
 705
 706         hres = push_instr_bstr(ctx, is_set ? OP_set_member : OP_assign_member, stat->member_expr->identifier);
 707     }else {
 708         hres = push_instr_bstr(ctx, is_set ? OP_set_ident : OP_assign_ident, stat->member_expr->identifier);
 709     }
 710
 711     return hres;
 712 }
 713
 714 static BOOL lookup_dim_decls(compile_ctx_t *ctx, const WCHAR *name)
 715 {
 716     dim_decl_t *dim_decl;
 717
 718     for(dim_decl = ctx->dim_decls; dim_decl; dim_decl = dim_decl->next) {
 719         if(!strcmpiW(dim_decl->name, name))
 720             return TRUE;
 721     }
 722
 723     return FALSE;
 724 }
 725
 726 static BOOL lookup_args_name(compile_ctx_t *ctx, const WCHAR *name)
 727 {
 728     unsigned i;
 729
 730     for(i = 0; i < ctx->func->arg_cnt; i++) {
 731         if(!strcmpiW(ctx->func->args[i].name, name))
 732             return TRUE;
 733     }
 734
 735     return FALSE;
 736 }
 737
 738 static HRESULT compile_dim_statement(compile_ctx_t *ctx, dim_statement_t *stat)
 739 {
 740     dim_decl_t *dim_decl = stat->dim_decls;
 741
 742     while(1) {
 743         if(lookup_dim_decls(ctx, dim_decl->name) || lookup_args_name(ctx, dim_decl->name)
 744            || lookup_const_decls(ctx, dim_decl->name, FALSE)) {
 745             FIXME("dim %s name redefined\n", debugstr_w(dim_decl->name));
 746             return E_FAIL;
 747         }
 748
 749         ctx->func->var_cnt++;
 750         if(!dim_decl->next)
 751             break;
 752         dim_decl = dim_decl->next;
 753     }
 754
 755     dim_decl->next = ctx->dim_decls;
 756     ctx->dim_decls = stat->dim_decls;
 757     return S_OK;
 758 }
 759
 760 static HRESULT compile_const_statement(compile_ctx_t *ctx, const_statement_t *stat)
 761 {
 762     const_decl_t *decl, *next_decl = stat->decls;
 763
 764     do {
 765         decl = next_decl;
 766
 767         if(lookup_const_decls(ctx, decl->name, FALSE) || lookup_args_name(ctx, decl->name)
 768                 || lookup_dim_decls(ctx, decl->name)) {
 769             FIXME("%s redefined\n", debugstr_w(decl->name));
 770             return E_FAIL;
 771         }
 772
 773         if(ctx->func->type == FUNC_GLOBAL) {
 774             HRESULT hres;
 775
 776             hres = compile_expression(ctx, decl->value_expr);
 777             if(FAILED(hres))
 778                 return hres;
 779
 780             hres = push_instr_bstr(ctx, OP_const, decl->name);
 781             if(FAILED(hres))
 782                 return hres;
 783         }
 784
 785         next_decl = decl->next;
 786         decl->next = ctx->const_decls;
 787         ctx->const_decls = decl;
 788     } while(next_decl);
 789
 790     return S_OK;
 791 }
 792
 793 static HRESULT compile_function_statement(compile_ctx_t *ctx, function_statement_t *stat)
 794 {
 795     if(ctx->func != &ctx->code->global_code) {
 796         FIXME("Function is not in the global code\n");
 797         return E_FAIL;
 798     }
 799
 800     stat->func_decl->next = ctx->func_decls;
 801     ctx->func_decls = stat->func_decl;
 802     return S_OK;
 803 }
 804
 805 static HRESULT compile_exitdo_statement(compile_ctx_t *ctx)
 806 {
 807     if(ctx->while_end_label == -1) {
 808         FIXME("Exit Do outside Do Loop\n");
 809         return E_FAIL;
 810     }
 811
 812     return push_instr_addr(ctx, OP_jmp, ctx->while_end_label);
 813 }
 814
 815 static HRESULT compile_exitfor_statement(compile_ctx_t *ctx)
 816 {
 817     if(ctx->for_end_label == -1) {
 818         FIXME("Exit For outside For Loop\n");
 819         return E_FAIL;
 820     }
 821
 822     return push_instr_addr(ctx, OP_jmp, ctx->for_end_label);
 823 }
 824
 825 static HRESULT compile_exitsub_statement(compile_ctx_t *ctx)
 826 {
 827     if(ctx->sub_end_label == -1) {
 828         FIXME("Exit Sub outside Sub?\n");
 829         return E_FAIL;
 830     }
 831
 832     return push_instr_addr(ctx, OP_jmp, ctx->sub_end_label);
 833 }
 834
 835 static HRESULT compile_exitfunc_statement(compile_ctx_t *ctx)
 836 {
 837     if(ctx->func_end_label == -1) {
 838         FIXME("Exit Function outside Function?\n");
 839         return E_FAIL;
 840     }
 841
 842     return push_instr_addr(ctx, OP_jmp, ctx->func_end_label);
 843 }
 844
 845 static HRESULT compile_exitprop_statement(compile_ctx_t *ctx)
 846 {
 847     if(ctx->prop_end_label == -1) {
 848         FIXME("Exit Property outside Property?\n");
 849         return E_FAIL;
 850     }
 851
 852     return push_instr_addr(ctx, OP_jmp, ctx->prop_end_label);
 853 }
 854
 855 static HRESULT compile_onerror_statement(compile_ctx_t *ctx, onerror_statement_t *stat)
 856 {
 857     return push_instr_int(ctx, OP_errmode, stat->resume_next);
 858 }
 859
 860 static HRESULT compile_statement(compile_ctx_t *ctx, statement_t *stat)
 861 {
 862     HRESULT hres;
 863
 864     while(stat) {
 865         switch(stat->type) {
 866         case STAT_ASSIGN:
 867             hres = compile_assign_statement(ctx, (assign_statement_t*)stat, FALSE);
 868             break;
 869         case STAT_CALL:
 870             hres = compile_member_expression(ctx, ((call_statement_t*)stat)->expr, FALSE);
 871             break;
 872         case STAT_CONST:
 873             hres = compile_const_statement(ctx, (const_statement_t*)stat);
 874             break;
 875         case STAT_DIM:
 876             hres = compile_dim_statement(ctx, (dim_statement_t*)stat);
 877             break;
 878         case STAT_DOWHILE:
 879         case STAT_DOUNTIL:
 880             hres = compile_dowhile_statement(ctx, (while_statement_t*)stat);
 881             break;
 882         case STAT_EXITDO:
 883             hres = compile_exitdo_statement(ctx);
 884             break;
 885         case STAT_EXITFOR:
 886             hres = compile_exitfor_statement(ctx);
 887             break;
 888         case STAT_EXITFUNC:
 889             hres = compile_exitfunc_statement(ctx);
 890             break;
 891         case STAT_EXITPROP:
 892             hres = compile_exitprop_statement(ctx);
 893             break;
 894         case STAT_EXITSUB:
 895             hres = compile_exitsub_statement(ctx);
 896             break;
 897         case STAT_FORTO:
 898             hres = compile_forto_statement(ctx, (forto_statement_t*)stat);
 899             break;
 900         case STAT_FUNC:
 901             hres = compile_function_statement(ctx, (function_statement_t*)stat);
 902             break;
 903         case STAT_IF:
 904             hres = compile_if_statement(ctx, (if_statement_t*)stat);
 905             break;
 906         case STAT_ONERROR:
 907             hres = compile_onerror_statement(ctx, (onerror_statement_t*)stat);
 908             break;
 909         case STAT_SET:
 910             hres = compile_assign_statement(ctx, (assign_statement_t*)stat, TRUE);
 911             break;
 912         case STAT_STOP:
 913             hres = push_instr(ctx, OP_stop) == -1 ? E_OUTOFMEMORY : S_OK;
 914             break;
 915         case STAT_UNTIL:
 916         case STAT_WHILE:
 917         case STAT_WHILELOOP:
 918             hres = compile_while_statement(ctx, (while_statement_t*)stat);
 919             break;
 920         default:
 921             FIXME("Unimplemented statement type %d\n", stat->type);
 922             hres = E_NOTIMPL;
 923         }
 924
 925         if(FAILED(hres))
 926             return hres;
 927         stat = stat->next;
 928     }
 929
 930     return S_OK;
 931 }
 932
 933 static void resolve_labels(compile_ctx_t *ctx, unsigned off)
 934 {
 935     instr_t *instr;
 936
 937     for(instr = ctx->code->instrs+off; instr < ctx->code->instrs+ctx->instr_cnt; instr++) {
 938         if(instr_info[instr->op].arg1_type == ARG_ADDR && (instr->arg1.uint & LABEL_FLAG)) {
 939             assert((instr->arg1.uint & ~LABEL_FLAG) < ctx->labels_cnt);
 940             instr->arg1.uint = ctx->labels[instr->arg1.uint & ~LABEL_FLAG];
 941         }
 942         assert(instr_info[instr->op].arg2_type != ARG_ADDR);
 943     }
 944
 945     ctx->labels_cnt = 0;
 946 }
 947
 948 static HRESULT compile_func(compile_ctx_t *ctx, statement_t *stat, function_t *func)
 949 {
 950     HRESULT hres;
 951
 952     func->code_off = ctx->instr_cnt;
 953
 954     ctx->while_end_label = -1;
 955     ctx->for_end_label = -1;
 956     ctx->sub_end_label = -1;
 957     ctx->func_end_label = -1;
 958     ctx->prop_end_label = -1;
 959
 960     switch(func->type) {
 961     case FUNC_FUNCTION:
 962         ctx->func_end_label = alloc_label(ctx);
 963         if(ctx->func_end_label == -1)
 964             return E_OUTOFMEMORY; /* FIXME ! */
 965         break;
 966     case FUNC_SUB:
 967         ctx->sub_end_label = alloc_label(ctx);
 968         if(ctx->sub_end_label == -1)
 969             return E_OUTOFMEMORY;
 970         break;
 971     case FUNC_PROPGET:
 972     case FUNC_PROPLET:
 973     case FUNC_PROPSET:
 974     case FUNC_DEFGET:
 975         ctx->prop_end_label = alloc_label(ctx);
 976         if(ctx->prop_end_label == -1)
 977             return E_OUTOFMEMORY;
 978         break;
 979     case FUNC_GLOBAL:
 980         break;
 981     }
 982
 983     ctx->func = func;
 984     ctx->dim_decls = NULL;
 985     ctx->const_decls = NULL;
 986     hres = compile_statement(ctx, stat);
 987     ctx->func = NULL;
 988     if(FAILED(hres))
 989         return hres;
 990
 991     assert(ctx->while_end_label == -1);
 992     assert(ctx->for_end_label == -1);
 993
 994     if(ctx->sub_end_label != -1)
 995         label_set_addr(ctx, ctx->sub_end_label);
 996     if(ctx->func_end_label != -1)
 997         label_set_addr(ctx, ctx->func_end_label);
 998     if(ctx->prop_end_label != -1)
 999         label_set_addr(ctx, ctx->prop_end_label);
1000
1001     if(push_instr(ctx, OP_ret) == -1)
1002         return E_OUTOFMEMORY;
1003
1004     resolve_labels(ctx, func->code_off);
1005
1006     if(func->var_cnt) {
1007         dim_decl_t *dim_decl;
1008
1009         if(func->type == FUNC_GLOBAL) {
1010             dynamic_var_t *new_var;
1011
1012             func->var_cnt = 0;
1013
1014             for(dim_decl = ctx->dim_decls; dim_decl; dim_decl = dim_decl->next) {
1015                 new_var = compiler_alloc(ctx->code, sizeof(*new_var));
1016                 if(!new_var)
1017                     return E_OUTOFMEMORY;
1018
1019                 new_var->name = compiler_alloc_string(ctx->code, dim_decl->name);
1020                 if(!new_var->name)
1021                     return E_OUTOFMEMORY;
1022
1023                 V_VT(&new_var->v) = VT_EMPTY;
1024                 new_var->is_const = FALSE;
1025
1026                 new_var->next = ctx->global_vars;
1027                 ctx->global_vars = new_var;
1028             }
1029         }else {
1030             unsigned i;
1031
1032             func->vars = compiler_alloc(ctx->code, func->var_cnt * sizeof(var_desc_t));
1033             if(!func->vars)
1034                 return E_OUTOFMEMORY;
1035
1036             for(dim_decl = ctx->dim_decls, i=0; dim_decl; dim_decl = dim_decl->next, i++) {
1037                 func->vars[i].name = compiler_alloc_string(ctx->code, dim_decl->name);
1038                 if(!func->vars[i].name)
1039                     return E_OUTOFMEMORY;
1040             }
1041
1042             assert(i == func->var_cnt);
1043         }
1044     }
1045
1046     return S_OK;
1047 }
1048
1049 static BOOL lookup_funcs_name(compile_ctx_t *ctx, const WCHAR *name)
1050 {
1051     function_t *iter;
1052
1053     for(iter = ctx->funcs; iter; iter = iter->next) {
1054         if(!strcmpiW(iter->name, name))
1055             return TRUE;
1056     }
1057
1058     return FALSE;
1059 }
1060
1061 static HRESULT create_function(compile_ctx_t *ctx, function_decl_t *decl, function_t **ret)
1062 {
1063     function_t *func;
1064     HRESULT hres;
1065
1066     if(lookup_dim_decls(ctx, decl->name) || lookup_funcs_name(ctx, decl->name) || lookup_const_decls(ctx, decl->name, FALSE)) {
1067         FIXME("%s: redefinition\n", debugstr_w(decl->name));
1068         return E_FAIL;
1069     }
1070
1071     func = compiler_alloc(ctx->code, sizeof(*func));
1072     if(!func)
1073         return E_OUTOFMEMORY;
1074
1075     func->name = compiler_alloc_string(ctx->code, decl->name);
1076     if(!func->name)
1077         return E_OUTOFMEMORY;
1078
1079     func->vars = NULL;
1080     func->var_cnt = 0;
1081     func->code_ctx = ctx->code;
1082     func->type = decl->type;
1083     func->is_public = decl->is_public;
1084
1085     func->arg_cnt = 0;
1086     if(decl->args) {
1087         arg_decl_t *arg;
1088         unsigned i;
1089
1090         for(arg = decl->args; arg; arg = arg->next)
1091             func->arg_cnt++;
1092
1093         func->args = compiler_alloc(ctx->code, func->arg_cnt * sizeof(arg_desc_t));
1094         if(!func->args)
1095             return E_OUTOFMEMORY;
1096
1097         for(i = 0, arg = decl->args; arg; arg = arg->next, i++) {
1098             func->args[i].name = compiler_alloc_string(ctx->code, arg->name);
1099             if(!func->args[i].name)
1100                 return E_OUTOFMEMORY;
1101             func->args[i].by_ref = arg->by_ref;
1102         }
1103     }else {
1104         func->args = NULL;
1105     }
1106
1107     hres = compile_func(ctx, decl->body, func);
1108     if(FAILED(hres))
1109         return hres;
1110
1111     *ret = func;
1112     return S_OK;
1113 }
1114
1115 static BOOL lookup_class_name(compile_ctx_t *ctx, const WCHAR *name)
1116 {
1117     class_desc_t *iter;
1118
1119     for(iter = ctx->classes; iter; iter = iter->next) {
1120         if(!strcmpiW(iter->name, name))
1121             return TRUE;
1122     }
1123
1124     return FALSE;
1125 }
1126
1127 static HRESULT create_class_funcprop(compile_ctx_t *ctx, function_decl_t *func_decl, vbdisp_funcprop_desc_t *desc)
1128 {
1129     vbdisp_invoke_type_t invoke_type;
1130     function_decl_t *funcprop_decl;
1131     HRESULT hres;
1132
1133     desc->name = compiler_alloc_string(ctx->code, func_decl->name);
1134     if(!desc->name)
1135         return E_OUTOFMEMORY;
1136
1137     for(funcprop_decl = func_decl; funcprop_decl; funcprop_decl = funcprop_decl->next_prop_func) {
1138         switch(funcprop_decl->type) {
1139         case FUNC_FUNCTION:
1140         case FUNC_SUB:
1141         case FUNC_PROPGET:
1142         case FUNC_DEFGET:
1143             invoke_type = VBDISP_CALLGET;
1144             break;
1145         case FUNC_PROPLET:
1146             invoke_type = VBDISP_LET;
1147             break;
1148         case FUNC_PROPSET:
1149             invoke_type = VBDISP_SET;
1150             break;
1151         default:
1152             assert(0);
1153         }
1154
1155         assert(!desc->entries[invoke_type]);
1156
1157         if(funcprop_decl->is_public)
1158             desc->is_public = TRUE;
1159
1160         hres = create_function(ctx, funcprop_decl, desc->entries+invoke_type);
1161         if(FAILED(hres))
1162             return hres;
1163     }
1164
1165     return S_OK;
1166 }
1167
1168 static BOOL lookup_class_funcs(class_desc_t *class_desc, const WCHAR *name)
1169 {
1170     unsigned i;
1171
1172     for(i=0; i < class_desc->func_cnt; i++) {
1173         if(class_desc->funcs[i].name && !strcmpiW(class_desc->funcs[i].name, name))
1174             return TRUE;
1175     }
1176
1177     return FALSE;
1178 }
1179
1180 static HRESULT compile_class(compile_ctx_t *ctx, class_decl_t *class_decl)
1181 {
1182     function_decl_t *func_decl, *func_prop_decl;
1183     class_prop_decl_t *prop_decl;
1184     class_desc_t *class_desc;
1185     unsigned i;
1186     HRESULT hres;
1187
1188     static const WCHAR class_initializeW[] = {'c','l','a','s','s','_','i','n','i','t','i','a','l','i','z','e',0};
1189     static const WCHAR class_terminateW[] = {'c','l','a','s','s','_','t','e','r','m','i','n','a','t','e',0};
1190
1191     if(lookup_dim_decls(ctx, class_decl->name) || lookup_funcs_name(ctx, class_decl->name)
1192             || lookup_const_decls(ctx, class_decl->name, FALSE) || lookup_class_name(ctx, class_decl->name)) {
1193         FIXME("%s: redefinition\n", debugstr_w(class_decl->name));
1194         return E_FAIL;
1195     }
1196
1197     class_desc = compiler_alloc_zero(ctx->code, sizeof(*class_desc));
1198     if(!class_desc)
1199         return E_OUTOFMEMORY;
1200
1201     class_desc->name = compiler_alloc_string(ctx->code, class_decl->name);
1202     if(!class_desc->name)
1203         return E_OUTOFMEMORY;
1204
1205     class_desc->func_cnt = 1; /* always allocate slot for default getter */
1206
1207     for(func_decl = class_decl->funcs; func_decl; func_decl = func_decl->next) {
1208         for(func_prop_decl = func_decl; func_prop_decl; func_prop_decl = func_prop_decl->next_prop_func) {
1209             if(func_prop_decl->type == FUNC_DEFGET)
1210                 break;
1211         }
1212         if(!func_prop_decl)
1213             class_desc->func_cnt++;
1214     }
1215
1216     class_desc->funcs = compiler_alloc(ctx->code, class_desc->func_cnt*sizeof(*class_desc->funcs));
1217     if(!class_desc->funcs)
1218         return E_OUTOFMEMORY;
1219     memset(class_desc->funcs, 0, class_desc->func_cnt*sizeof(*class_desc->funcs));
1220
1221     for(func_decl = class_decl->funcs, i=1; func_decl; func_decl = func_decl->next, i++) {
1222         for(func_prop_decl = func_decl; func_prop_decl; func_prop_decl = func_prop_decl->next_prop_func) {
1223             if(func_prop_decl->type == FUNC_DEFGET) {
1224                 i--;
1225                 break;
1226             }
1227         }
1228
1229         if(!strcmpiW(class_initializeW, func_decl->name)) {
1230             if(func_decl->type != FUNC_SUB) {
1231                 FIXME("class initializer is not sub\n");
1232                 return E_FAIL;
1233             }
1234
1235             class_desc->class_initialize_id = i;
1236         }else  if(!strcmpiW(class_terminateW, func_decl->name)) {
1237             if(func_decl->type != FUNC_SUB) {
1238                 FIXME("class terminator is not sub\n");
1239                 return E_FAIL;
1240             }
1241
1242             class_desc->class_terminate_id = i;
1243         }
1244
1245         hres = create_class_funcprop(ctx, func_decl, class_desc->funcs + (func_prop_decl ? 0 : i));
1246         if(FAILED(hres))
1247             return hres;
1248     }
1249
1250     for(prop_decl = class_decl->props; prop_decl; prop_decl = prop_decl->next)
1251         class_desc->prop_cnt++;
1252
1253     class_desc->props = compiler_alloc(ctx->code, class_desc->prop_cnt*sizeof(*class_desc->props));
1254     if(!class_desc->props)
1255         return E_OUTOFMEMORY;
1256
1257     for(prop_decl = class_decl->props, i=0; prop_decl; prop_decl = prop_decl->next, i++) {
1258         if(lookup_class_funcs(class_desc, prop_decl->name)) {
1259             FIXME("Property %s redefined\n", debugstr_w(prop_decl->name));
1260             return E_FAIL;
1261         }
1262
1263         class_desc->props[i].name = compiler_alloc_string(ctx->code, prop_decl->name);
1264         if(!class_desc->props[i].name)
1265             return E_OUTOFMEMORY;
1266
1267         class_desc->props[i].is_public = prop_decl->is_public;
1268     }
1269
1270     class_desc->next = ctx->classes;
1271     ctx->classes = class_desc;
1272     return S_OK;
1273 }
1274
1275 static BOOL lookup_script_identifier(script_ctx_t *script, const WCHAR *identifier)
1276 {
1277     class_desc_t *class;
1278     dynamic_var_t *var;
1279     function_t *func;
1280
1281     for(var = script->global_vars; var; var = var->next) {
1282         if(!strcmpiW(var->name, identifier))
1283             return TRUE;
1284     }
1285
1286     for(func = script->global_funcs; func; func = func->next) {
1287         if(!strcmpiW(func->name, identifier))
1288             return TRUE;
1289     }
1290
1291     for(class = script->classes; class; class = class->next) {
1292         if(!strcmpiW(class->name, identifier))
1293             return TRUE;
1294     }
1295
1296     return FALSE;
1297 }
1298
1299 static HRESULT check_script_collisions(compile_ctx_t *ctx, script_ctx_t *script)
1300 {
1301     class_desc_t *class;
1302     dynamic_var_t *var;
1303     function_t *func;
1304
1305     for(var = ctx->global_vars; var; var = var->next) {
1306         if(lookup_script_identifier(script, var->name)) {
1307             FIXME("%s: redefined\n", debugstr_w(var->name));
1308             return E_FAIL;
1309         }
1310     }
1311
1312     for(func = ctx->funcs; func; func = func->next) {
1313         if(lookup_script_identifier(script, func->name)) {
1314             FIXME("%s: redefined\n", debugstr_w(func->name));
1315             return E_FAIL;
1316         }
1317     }
1318
1319     for(class = ctx->classes; class; class = class->next) {
1320         if(lookup_script_identifier(script, class->name)) {
1321             FIXME("%s: redefined\n", debugstr_w(class->name));
1322             return E_FAIL;
1323         }
1324     }
1325
1326     return S_OK;
1327 }
1328
1329 void release_vbscode(vbscode_t *code)
1330 {
1331     unsigned i;
1332
1333     list_remove(&code->entry);
1334
1335     for(i=0; i < code->bstr_cnt; i++)
1336         SysFreeString(code->bstr_pool[i]);
1337
1338     vbsheap_free(&code->heap);
1339
1340     heap_free(code->bstr_pool);
1341     heap_free(code->source);
1342     heap_free(code->instrs);
1343     heap_free(code);
1344 }
1345
1346 static vbscode_t *alloc_vbscode(compile_ctx_t *ctx, const WCHAR *source)
1347 {
1348     vbscode_t *ret;
1349
1350     ret = heap_alloc(sizeof(*ret));
1351     if(!ret)
1352         return NULL;
1353
1354     ret->source = heap_strdupW(source);
1355     if(!ret->source) {
1356         heap_free(ret);
1357         return NULL;
1358     }
1359
1360     ret->instrs = heap_alloc(32*sizeof(instr_t));
1361     if(!ret->instrs) {
1362         release_vbscode(ret);
1363         return NULL;
1364     }
1365
1366     ctx->instr_cnt = 0;
1367     ctx->instr_size = 32;
1368     vbsheap_init(&ret->heap);
1369
1370     ret->option_explicit = ctx->parser.option_explicit;
1371
1372     ret->bstr_pool = NULL;
1373     ret->bstr_pool_size = 0;
1374     ret->bstr_cnt = 0;
1375     ret->global_executed = FALSE;
1376
1377     ret->global_code.type = FUNC_GLOBAL;
1378     ret->global_code.name = NULL;
1379     ret->global_code.code_ctx = ret;
1380     ret->global_code.vars = NULL;
1381     ret->global_code.var_cnt = 0;
1382     ret->global_code.arg_cnt = 0;
1383     ret->global_code.args = NULL;
1384
1385     list_init(&ret->entry);
1386     return ret;
1387 }
1388
1389 static void release_compiler(compile_ctx_t *ctx)
1390 {
1391     parser_release(&ctx->parser);
1392     heap_free(ctx->labels);
1393     if(ctx->code)
1394         release_vbscode(ctx->code);
1395 }
1396
1397 HRESULT compile_script(script_ctx_t *script, const WCHAR *src, vbscode_t **ret)
1398 {
1399     function_t *new_func;
1400     function_decl_t *func_decl;
1401     class_decl_t *class_decl;
1402     compile_ctx_t ctx;
1403     vbscode_t *code;
1404     HRESULT hres;
1405
1406     hres = parse_script(&ctx.parser, src);
1407     if(FAILED(hres))
1408         return hres;
1409
1410     code = ctx.code = alloc_vbscode(&ctx, src);
1411     if(!ctx.code)
1412         return E_OUTOFMEMORY;
1413
1414     ctx.funcs = NULL;
1415     ctx.func_decls = NULL;
1416     ctx.global_vars = NULL;
1417     ctx.dim_decls = NULL;
1418     ctx.classes = NULL;
1419     ctx.labels = NULL;
1420     ctx.global_consts = NULL;
1421     ctx.labels_cnt = ctx.labels_size = 0;
1422
1423     hres = compile_func(&ctx, ctx.parser.stats, &ctx.code->global_code);
1424     if(FAILED(hres)) {
1425         release_compiler(&ctx);
1426         return hres;
1427     }
1428
1429     ctx.global_consts = ctx.const_decls;
1430
1431     for(func_decl = ctx.func_decls; func_decl; func_decl = func_decl->next) {
1432         hres = create_function(&ctx, func_decl, &new_func);
1433         if(FAILED(hres)) {
1434             release_compiler(&ctx);
1435             return hres;
1436         }
1437
1438         new_func->next = ctx.funcs;
1439         ctx.funcs = new_func;
1440     }
1441
1442     for(class_decl = ctx.parser.class_decls; class_decl; class_decl = class_decl->next) {
1443         hres = compile_class(&ctx, class_decl);
1444         if(FAILED(hres)) {
1445             release_compiler(&ctx);
1446             return hres;
1447         }
1448     }
1449
1450     hres = check_script_collisions(&ctx, script);
1451     if(FAILED(hres)) {
1452         release_compiler(&ctx);
1453         return hres;
1454     }
1455
1456     if(ctx.global_vars) {
1457         dynamic_var_t *var;
1458
1459         for(var = ctx.global_vars; var->next; var = var->next);
1460
1461         var->next = script->global_vars;
1462         script->global_vars = ctx.global_vars;
1463     }
1464
1465     if(ctx.funcs) {
1466         for(new_func = ctx.funcs; new_func->next; new_func = new_func->next);
1467
1468         new_func->next = script->global_funcs;
1469         script->global_funcs = ctx.funcs;
1470     }
1471
1472     if(ctx.classes) {
1473         class_desc_t *class = ctx.classes;
1474
1475         while(1) {
1476             class->ctx = script;
1477             if(!class->next)
1478                 break;
1479             class = class->next;
1480         }
1481
1482         class->next = script->classes;
1483         script->classes = ctx.classes;
1484     }
1485
1486     if(TRACE_ON(vbscript_disas))
1487         dump_code(&ctx);
1488
1489     ctx.code = NULL;
1490     release_compiler(&ctx);
1491
1492     list_add_tail(&script->code_list, &code->entry);
1493     *ret = code;
1494     return S_OK;
1495 }