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 sub_end_label;
  42     unsigned func_end_label;
  43
  44     dim_decl_t *dim_decls;
  45     dynamic_var_t *global_vars;
  46
  47     function_t *func;
  48     function_t *funcs;
  49     function_decl_t *func_decls;
  50
  51     class_desc_t *classes;
  52 } compile_ctx_t;
  53
  54 static HRESULT compile_expression(compile_ctx_t*,expression_t*);
  55 static HRESULT compile_statement(compile_ctx_t*,statement_t*);
  56
  57 static const struct {
  58     const char *op_str;
  59     instr_arg_type_t arg1_type;
  60     instr_arg_type_t arg2_type;
  61 } instr_info[] = {
  62 #define X(n,a,b,c) {#n,b,c},
  63 OP_LIST
  64 #undef X
  65 };
  66
  67 static void dump_instr_arg(instr_arg_type_t type, instr_arg_t *arg)
  68 {
  69     switch(type) {
  70     case ARG_STR:
  71     case ARG_BSTR:
  72         TRACE_(vbscript_disas)("\t%s", debugstr_w(arg->str));
  73         break;
  74     case ARG_INT:
  75         TRACE_(vbscript_disas)("\t%d", arg->uint);
  76         break;
  77     case ARG_UINT:
  78     case ARG_ADDR:
  79         TRACE_(vbscript_disas)("\t%u", arg->uint);
  80         break;
  81     case ARG_DOUBLE:
  82         TRACE_(vbscript_disas)("\t%lf", *arg->dbl);
  83         break;
  84     case ARG_NONE:
  85         break;
  86     default:
  87         assert(0);
  88     }
  89 }
  90
  91 static void dump_code(compile_ctx_t *ctx)
  92 {
  93     instr_t *instr;
  94
  95     for(instr = ctx->code->instrs; instr < ctx->code->instrs+ctx->instr_cnt; instr++) {
  96         TRACE_(vbscript_disas)("%d:\t%s", instr-ctx->code->instrs, instr_info[instr->op].op_str);
  97         dump_instr_arg(instr_info[instr->op].arg1_type, &instr->arg1);
  98         dump_instr_arg(instr_info[instr->op].arg2_type, &instr->arg2);
  99         TRACE_(vbscript_disas)("\n");
 100     }
 101 }
 102
 103 static inline void *compiler_alloc(vbscode_t *vbscode, size_t size)
 104 {
 105     return vbsheap_alloc(&vbscode->heap, size);
 106 }
 107
 108 static WCHAR *compiler_alloc_string(vbscode_t *vbscode, const WCHAR *str)
 109 {
 110     size_t size;
 111     WCHAR *ret;
 112
 113     size = (strlenW(str)+1)*sizeof(WCHAR);
 114     ret = compiler_alloc(vbscode, size);
 115     if(ret)
 116         memcpy(ret, str, size);
 117     return ret;
 118 }
 119
 120 static inline instr_t *instr_ptr(compile_ctx_t *ctx, unsigned id)
 121 {
 122     assert(id < ctx->instr_cnt);
 123     return ctx->code->instrs + id;
 124 }
 125
 126 static unsigned push_instr(compile_ctx_t *ctx, vbsop_t op)
 127 {
 128     assert(ctx->instr_size && ctx->instr_size >= ctx->instr_cnt);
 129
 130     if(ctx->instr_size == ctx->instr_cnt) {
 131         instr_t *new_instr;
 132
 133         new_instr = heap_realloc(ctx->code->instrs, ctx->instr_size*2*sizeof(instr_t));
 134         if(!new_instr)
 135             return -1;
 136
 137         ctx->code->instrs = new_instr;
 138         ctx->instr_size *= 2;
 139     }
 140
 141     ctx->code->instrs[ctx->instr_cnt].op = op;
 142     return ctx->instr_cnt++;
 143 }
 144
 145 static HRESULT push_instr_int(compile_ctx_t *ctx, vbsop_t op, LONG arg)
 146 {
 147     unsigned ret;
 148
 149     ret = push_instr(ctx, op);
 150     if(ret == -1)
 151         return E_OUTOFMEMORY;
 152
 153     instr_ptr(ctx, ret)->arg1.lng = arg;
 154     return S_OK;
 155 }
 156
 157 static HRESULT push_instr_addr(compile_ctx_t *ctx, vbsop_t op, unsigned arg)
 158 {
 159     unsigned ret;
 160
 161     ret = push_instr(ctx, op);
 162     if(ret == -1)
 163         return E_OUTOFMEMORY;
 164
 165     instr_ptr(ctx, ret)->arg1.uint = arg;
 166     return S_OK;
 167 }
 168
 169 static HRESULT push_instr_str(compile_ctx_t *ctx, vbsop_t op, const WCHAR *arg)
 170 {
 171     unsigned instr;
 172     WCHAR *str;
 173
 174     str = compiler_alloc_string(ctx->code, arg);
 175     if(!str)
 176         return E_OUTOFMEMORY;
 177
 178     instr = push_instr(ctx, op);
 179     if(instr == -1)
 180         return E_OUTOFMEMORY;
 181
 182     instr_ptr(ctx, instr)->arg1.str = str;
 183     return S_OK;
 184 }
 185
 186 static HRESULT push_instr_double(compile_ctx_t *ctx, vbsop_t op, double arg)
 187 {
 188     unsigned instr;
 189     double *d;
 190
 191     d = compiler_alloc(ctx->code, sizeof(double));
 192     if(!d)
 193         return E_OUTOFMEMORY;
 194
 195     instr = push_instr(ctx, op);
 196     if(instr == -1)
 197         return E_OUTOFMEMORY;
 198
 199     *d = arg;
 200     instr_ptr(ctx, instr)->arg1.dbl = d;
 201     return S_OK;
 202 }
 203
 204 static BSTR alloc_bstr_arg(compile_ctx_t *ctx, const WCHAR *str)
 205 {
 206     if(!ctx->code->bstr_pool_size) {
 207         ctx->code->bstr_pool = heap_alloc(8 * sizeof(BSTR));
 208         if(!ctx->code->bstr_pool)
 209             return NULL;
 210         ctx->code->bstr_pool_size = 8;
 211     }else if(ctx->code->bstr_pool_size == ctx->code->bstr_cnt) {
 212        BSTR *new_pool;
 213
 214         new_pool = heap_realloc(ctx->code->bstr_pool, ctx->code->bstr_pool_size*2*sizeof(BSTR));
 215         if(!new_pool)
 216             return NULL;
 217
 218         ctx->code->bstr_pool = new_pool;
 219         ctx->code->bstr_pool_size *= 2;
 220     }
 221
 222     ctx->code->bstr_pool[ctx->code->bstr_cnt] = SysAllocString(str);
 223     if(!ctx->code->bstr_pool[ctx->code->bstr_cnt])
 224         return NULL;
 225
 226     return ctx->code->bstr_pool[ctx->code->bstr_cnt++];
 227 }
 228
 229 static HRESULT push_instr_bstr(compile_ctx_t *ctx, vbsop_t op, const WCHAR *arg)
 230 {
 231     unsigned instr;
 232     BSTR bstr;
 233
 234     bstr = alloc_bstr_arg(ctx, arg);
 235     if(!bstr)
 236         return E_OUTOFMEMORY;
 237
 238     instr = push_instr(ctx, op);
 239     if(instr == -1)
 240         return E_OUTOFMEMORY;
 241
 242     instr_ptr(ctx, instr)->arg1.bstr = bstr;
 243     return S_OK;
 244 }
 245
 246 static HRESULT push_instr_bstr_uint(compile_ctx_t *ctx, vbsop_t op, const WCHAR *arg1, unsigned arg2)
 247 {
 248     unsigned instr;
 249     BSTR bstr;
 250
 251     bstr = alloc_bstr_arg(ctx, arg1);
 252     if(!bstr)
 253         return E_OUTOFMEMORY;
 254
 255     instr = push_instr(ctx, op);
 256     if(instr == -1)
 257         return E_OUTOFMEMORY;
 258
 259     instr_ptr(ctx, instr)->arg1.bstr = bstr;
 260     instr_ptr(ctx, instr)->arg2.uint = arg2;
 261     return S_OK;
 262 }
 263
 264 #define LABEL_FLAG 0x80000000
 265
 266 static unsigned alloc_label(compile_ctx_t *ctx)
 267 {
 268     if(!ctx->labels_size) {
 269         ctx->labels = heap_alloc(8 * sizeof(*ctx->labels));
 270         if(!ctx->labels)
 271             return -1;
 272         ctx->labels_size = 8;
 273     }else if(ctx->labels_size == ctx->labels_cnt) {
 274         unsigned *new_labels;
 275
 276         new_labels = heap_realloc(ctx->labels, 2*ctx->labels_size*sizeof(*ctx->labels));
 277         if(!new_labels)
 278             return -1;
 279
 280         ctx->labels = new_labels;
 281         ctx->labels_size *= 2;
 282     }
 283
 284     return ctx->labels_cnt++ | LABEL_FLAG;
 285 }
 286
 287 static inline void label_set_addr(compile_ctx_t *ctx, unsigned label)
 288 {
 289     assert(label & LABEL_FLAG);
 290     ctx->labels[label & ~LABEL_FLAG] = ctx->instr_cnt;
 291 }
 292
 293 static HRESULT compile_args(compile_ctx_t *ctx, expression_t *args, unsigned *ret)
 294 {
 295     unsigned arg_cnt = 0;
 296     HRESULT hres;
 297
 298     while(args) {
 299         hres = compile_expression(ctx, args);
 300         if(FAILED(hres))
 301             return hres;
 302
 303         arg_cnt++;
 304         args = args->next;
 305     }
 306
 307     *ret = arg_cnt;
 308     return S_OK;
 309 }
 310
 311 static HRESULT compile_member_expression(compile_ctx_t *ctx, member_expression_t *expr, BOOL ret_val)
 312 {
 313     unsigned arg_cnt = 0;
 314     HRESULT hres;
 315
 316     hres = compile_args(ctx, expr->args, &arg_cnt);
 317     if(FAILED(hres))
 318         return hres;
 319
 320     if(expr->obj_expr) {
 321         FIXME("obj_expr not implemented\n");
 322         hres = E_NOTIMPL;
 323     }else {
 324         hres = push_instr_bstr_uint(ctx, ret_val ? OP_icall : OP_icallv, expr->identifier, arg_cnt);
 325     }
 326
 327     return hres;
 328 }
 329
 330 static HRESULT compile_unary_expression(compile_ctx_t *ctx, unary_expression_t *expr, vbsop_t op)
 331 {
 332     HRESULT hres;
 333
 334     hres = compile_expression(ctx, expr->subexpr);
 335     if(FAILED(hres))
 336         return hres;
 337
 338     return push_instr(ctx, op) == -1 ? E_OUTOFMEMORY : S_OK;
 339 }
 340
 341 static HRESULT compile_binary_expression(compile_ctx_t *ctx, binary_expression_t *expr, vbsop_t op)
 342 {
 343     HRESULT hres;
 344
 345     hres = compile_expression(ctx, expr->left);
 346     if(FAILED(hres))
 347         return hres;
 348
 349     hres = compile_expression(ctx, expr->right);
 350     if(FAILED(hres))
 351         return hres;
 352
 353     return push_instr(ctx, op) == -1 ? E_OUTOFMEMORY : S_OK;
 354 }
 355
 356 static HRESULT compile_expression(compile_ctx_t *ctx, expression_t *expr)
 357 {
 358     switch(expr->type) {
 359     case EXPR_ADD:
 360         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_add);
 361     case EXPR_AND:
 362         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_and);
 363     case EXPR_BOOL:
 364         return push_instr_int(ctx, OP_bool, ((bool_expression_t*)expr)->value);
 365     case EXPR_CONCAT:
 366         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_concat);
 367     case EXPR_DIV:
 368         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_div);
 369     case EXPR_DOUBLE:
 370         return push_instr_double(ctx, OP_double, ((double_expression_t*)expr)->value);
 371     case EXPR_EMPTY:
 372         return push_instr(ctx, OP_empty) != -1 ? S_OK : E_OUTOFMEMORY;
 373     case EXPR_EQUAL:
 374         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_equal);
 375     case EXPR_EQV:
 376         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_eqv);
 377     case EXPR_EXP:
 378         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_exp);
 379     case EXPR_IDIV:
 380         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_idiv);
 381     case EXPR_IMP:
 382         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_imp);
 383     case EXPR_MEMBER:
 384         return compile_member_expression(ctx, (member_expression_t*)expr, TRUE);
 385     case EXPR_MOD:
 386         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_mod);
 387     case EXPR_MUL:
 388         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_mul);
 389     case EXPR_NEG:
 390         return compile_unary_expression(ctx, (unary_expression_t*)expr, OP_neg);
 391     case EXPR_NEQUAL:
 392         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_nequal);
 393     case EXPR_NOT:
 394         return compile_unary_expression(ctx, (unary_expression_t*)expr, OP_not);
 395     case EXPR_NULL:
 396         return push_instr(ctx, OP_null) != -1 ? S_OK : E_OUTOFMEMORY;
 397     case EXPR_OR:
 398         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_or);
 399     case EXPR_STRING:
 400         return push_instr_str(ctx, OP_string, ((string_expression_t*)expr)->value);
 401     case EXPR_SUB:
 402         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_sub);
 403     case EXPR_USHORT:
 404         return push_instr_int(ctx, OP_short, ((int_expression_t*)expr)->value);
 405     case EXPR_ULONG:
 406         return push_instr_int(ctx, OP_long, ((int_expression_t*)expr)->value);
 407     case EXPR_XOR:
 408         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_xor);
 409     default:
 410         FIXME("Unimplemented expression type %d\n", expr->type);
 411         return E_NOTIMPL;
 412     }
 413
 414     return S_OK;
 415 }
 416
 417 static HRESULT compile_if_statement(compile_ctx_t *ctx, if_statement_t *stat)
 418 {
 419     unsigned cnd_jmp, endif_label = -1;
 420     elseif_decl_t *elseif_decl;
 421     HRESULT hres;
 422
 423     hres = compile_expression(ctx, stat->expr);
 424     if(FAILED(hres))
 425         return hres;
 426
 427     cnd_jmp = push_instr(ctx, OP_jmp_false);
 428     if(cnd_jmp == -1)
 429         return E_OUTOFMEMORY;
 430
 431     hres = compile_statement(ctx, stat->if_stat);
 432     if(FAILED(hres))
 433         return hres;
 434
 435     if(stat->else_stat || stat->elseifs) {
 436         endif_label = alloc_label(ctx);
 437         if(endif_label == -1)
 438             return E_OUTOFMEMORY;
 439
 440         hres = push_instr_addr(ctx, OP_jmp, endif_label);
 441         if(FAILED(hres))
 442             return hres;
 443     }
 444
 445     for(elseif_decl = stat->elseifs; elseif_decl; elseif_decl = elseif_decl->next) {
 446         instr_ptr(ctx, cnd_jmp)->arg1.uint = ctx->instr_cnt;
 447
 448         hres = compile_expression(ctx, elseif_decl->expr);
 449         if(FAILED(hres))
 450             return hres;
 451
 452         cnd_jmp = push_instr(ctx, OP_jmp_false);
 453         if(cnd_jmp == -1)
 454             return E_OUTOFMEMORY;
 455
 456         hres = compile_statement(ctx, elseif_decl->stat);
 457         if(FAILED(hres))
 458             return hres;
 459
 460         hres = push_instr_addr(ctx, OP_jmp, endif_label);
 461         if(FAILED(hres))
 462             return hres;
 463     }
 464
 465     instr_ptr(ctx, cnd_jmp)->arg1.uint = ctx->instr_cnt;
 466
 467     if(stat->else_stat) {
 468         hres = compile_statement(ctx, stat->else_stat);
 469         if(FAILED(hres))
 470             return hres;
 471     }
 472
 473     if(endif_label != -1)
 474         label_set_addr(ctx, endif_label);
 475     return S_OK;
 476 }
 477
 478 static HRESULT compile_assign_statement(compile_ctx_t *ctx, assign_statement_t *stat)
 479 {
 480     HRESULT hres;
 481
 482     hres = compile_expression(ctx, stat->value_expr);
 483     if(FAILED(hres))
 484         return hres;
 485
 486     if(stat->member_expr->args) {
 487         FIXME("arguments support not implemented\n");
 488         return E_NOTIMPL;
 489     }
 490
 491     if(stat->member_expr->obj_expr) {
 492         hres = compile_expression(ctx, stat->member_expr->obj_expr);
 493         if(FAILED(hres))
 494             return hres;
 495
 496         hres = push_instr_bstr(ctx, OP_assign_member, stat->member_expr->identifier);
 497     }else {
 498         hres = push_instr_bstr(ctx, OP_assign_ident, stat->member_expr->identifier);
 499     }
 500
 501     return hres;
 502 }
 503
 504 static BOOL lookup_dim_decls(compile_ctx_t *ctx, const WCHAR *name)
 505 {
 506     dim_decl_t *dim_decl;
 507
 508     for(dim_decl = ctx->dim_decls; dim_decl; dim_decl = dim_decl->next) {
 509         if(!strcmpiW(dim_decl->name, name))
 510             return TRUE;
 511     }
 512
 513     return FALSE;
 514 }
 515
 516 static BOOL lookup_args_name(compile_ctx_t *ctx, const WCHAR *name)
 517 {
 518     unsigned i;
 519
 520     for(i = 0; i < ctx->func->arg_cnt; i++) {
 521         if(!strcmpiW(ctx->func->args[i].name, name))
 522             return TRUE;
 523     }
 524
 525     return FALSE;
 526 }
 527
 528 static HRESULT compile_dim_statement(compile_ctx_t *ctx, dim_statement_t *stat)
 529 {
 530     dim_decl_t *dim_decl = stat->dim_decls;
 531
 532     while(1) {
 533         if(lookup_dim_decls(ctx, dim_decl->name) || lookup_args_name(ctx, dim_decl->name)) {
 534             FIXME("dim %s name redefined\n", debugstr_w(dim_decl->name));
 535             return E_FAIL;
 536         }
 537
 538         if(!dim_decl->next)
 539             break;
 540         dim_decl = dim_decl->next;
 541     }
 542
 543     dim_decl->next = ctx->dim_decls;
 544     ctx->dim_decls = stat->dim_decls;
 545     ctx->func->var_cnt++;
 546     return S_OK;
 547 }
 548
 549 static HRESULT compile_function_statement(compile_ctx_t *ctx, function_statement_t *stat)
 550 {
 551     if(ctx->func != &ctx->code->global_code) {
 552         FIXME("Function is not in the global code\n");
 553         return E_FAIL;
 554     }
 555
 556     stat->func_decl->next = ctx->func_decls;
 557     ctx->func_decls = stat->func_decl;
 558     return S_OK;
 559 }
 560
 561 static HRESULT compile_exitsub_statement(compile_ctx_t *ctx)
 562 {
 563     if(ctx->sub_end_label == -1) {
 564         FIXME("Exit Sub outside Sub?\n");
 565         return E_FAIL;
 566     }
 567
 568     return push_instr_addr(ctx, OP_jmp, ctx->sub_end_label);
 569 }
 570
 571 static HRESULT compile_exitfunc_statement(compile_ctx_t *ctx)
 572 {
 573     if(ctx->func_end_label == -1) {
 574         FIXME("Exit Function outside Function?\n");
 575         return E_FAIL;
 576     }
 577
 578     return push_instr_addr(ctx, OP_jmp, ctx->func_end_label);
 579 }
 580
 581 static HRESULT compile_statement(compile_ctx_t *ctx, statement_t *stat)
 582 {
 583     HRESULT hres;
 584
 585     while(stat) {
 586         switch(stat->type) {
 587         case STAT_ASSIGN:
 588             hres = compile_assign_statement(ctx, (assign_statement_t*)stat);
 589             break;
 590         case STAT_CALL:
 591             hres = compile_member_expression(ctx, ((call_statement_t*)stat)->expr, FALSE);
 592             break;
 593         case STAT_DIM:
 594             hres = compile_dim_statement(ctx, (dim_statement_t*)stat);
 595             break;
 596         case STAT_EXITFUNC:
 597             hres = compile_exitfunc_statement(ctx);
 598             break;
 599         case STAT_EXITSUB:
 600             hres = compile_exitsub_statement(ctx);
 601             break;
 602         case STAT_FUNC:
 603             hres = compile_function_statement(ctx, (function_statement_t*)stat);
 604             break;
 605         case STAT_IF:
 606             hres = compile_if_statement(ctx, (if_statement_t*)stat);
 607             break;
 608         default:
 609             FIXME("Unimplemented statement type %d\n", stat->type);
 610             hres = E_NOTIMPL;
 611         }
 612
 613         if(FAILED(hres))
 614             return hres;
 615         stat = stat->next;
 616     }
 617
 618     return S_OK;
 619 }
 620
 621 static void resolve_labels(compile_ctx_t *ctx, unsigned off)
 622 {
 623     instr_t *instr;
 624
 625     for(instr = ctx->code->instrs+off; instr < ctx->code->instrs+ctx->instr_cnt; instr++) {
 626         if(instr_info[instr->op].arg1_type == ARG_ADDR && (instr->arg1.uint & LABEL_FLAG)) {
 627             assert((instr->arg1.uint & ~LABEL_FLAG) < ctx->labels_cnt);
 628             instr->arg1.uint = ctx->labels[instr->arg1.uint & ~LABEL_FLAG];
 629         }
 630         assert(instr_info[instr->op].arg2_type != ARG_ADDR);
 631     }
 632
 633     ctx->labels_cnt = 0;
 634 }
 635
 636 static HRESULT compile_func(compile_ctx_t *ctx, statement_t *stat, function_t *func)
 637 {
 638     HRESULT hres;
 639
 640     func->code_off = ctx->instr_cnt;
 641
 642     ctx->sub_end_label = -1;
 643     ctx->func_end_label = -1;
 644
 645     switch(func->type) {
 646     case FUNC_FUNCTION:
 647         ctx->func_end_label = alloc_label(ctx);
 648         if(ctx->func_end_label == -1)
 649             return E_OUTOFMEMORY; /* FIXME ! */
 650         break;
 651     case FUNC_SUB:
 652         ctx->sub_end_label = alloc_label(ctx);
 653         if(ctx->sub_end_label == -1)
 654             return E_OUTOFMEMORY;
 655         break;
 656     case FUNC_GLOBAL:
 657         break;
 658     }
 659
 660     ctx->func = func;
 661     ctx->dim_decls = NULL;
 662     hres = compile_statement(ctx, stat);
 663     ctx->func = NULL;
 664     if(FAILED(hres))
 665         return hres;
 666
 667     if(ctx->sub_end_label != -1)
 668         label_set_addr(ctx, ctx->sub_end_label);
 669     if(ctx->func_end_label != -1)
 670         label_set_addr(ctx, ctx->func_end_label);
 671
 672     if(push_instr(ctx, OP_ret) == -1)
 673         return E_OUTOFMEMORY;
 674
 675     resolve_labels(ctx, func->code_off);
 676
 677     if(func->var_cnt) {
 678         dim_decl_t *dim_decl;
 679
 680         if(func->type == FUNC_GLOBAL) {
 681             dynamic_var_t *new_var;
 682
 683             func->var_cnt = 0;
 684
 685             for(dim_decl = ctx->dim_decls; dim_decl; dim_decl = dim_decl->next) {
 686                 new_var = compiler_alloc(ctx->code, sizeof(*new_var));
 687                 if(!new_var)
 688                     return E_OUTOFMEMORY;
 689
 690                 new_var->name = compiler_alloc_string(ctx->code, dim_decl->name);
 691                 if(!new_var->name)
 692                     return E_OUTOFMEMORY;
 693
 694                 V_VT(&new_var->v) = VT_EMPTY;
 695
 696                 new_var->next = ctx->global_vars;
 697                 ctx->global_vars = new_var;
 698             }
 699         }else {
 700             unsigned i;
 701
 702             func->vars = compiler_alloc(ctx->code, func->var_cnt * sizeof(var_desc_t));
 703             if(!func->vars)
 704                 return E_OUTOFMEMORY;
 705
 706             for(dim_decl = ctx->dim_decls, i=0; dim_decl; dim_decl = dim_decl->next, i++) {
 707                 func->vars[i].name = compiler_alloc_string(ctx->code, dim_decl->name);
 708                 if(!func->vars[i].name)
 709                     return E_OUTOFMEMORY;
 710             }
 711
 712             assert(i == func->var_cnt);
 713         }
 714     }
 715
 716     return S_OK;
 717 }
 718
 719 static BOOL lookup_funcs_name(compile_ctx_t *ctx, const WCHAR *name)
 720 {
 721     function_t *iter;
 722
 723     for(iter = ctx->funcs; iter; iter = iter->next) {
 724         if(!strcmpiW(iter->name, name))
 725             return TRUE;
 726     }
 727
 728     return FALSE;
 729 }
 730
 731 static HRESULT create_function(compile_ctx_t *ctx, function_decl_t *decl, function_t **ret)
 732 {
 733     function_t *func;
 734     HRESULT hres;
 735
 736     if(lookup_dim_decls(ctx, decl->name) || lookup_funcs_name(ctx, decl->name)) {
 737         FIXME("%s: redefinition\n", debugstr_w(decl->name));
 738         return E_FAIL;
 739     }
 740
 741     func = compiler_alloc(ctx->code, sizeof(*func));
 742     if(!func)
 743         return E_OUTOFMEMORY;
 744
 745     func->name = compiler_alloc_string(ctx->code, decl->name);
 746     if(!func->name)
 747         return E_OUTOFMEMORY;
 748
 749     func->vars = NULL;
 750     func->var_cnt = 0;
 751     func->code_ctx = ctx->code;
 752     func->type = decl->type;
 753
 754     func->arg_cnt = 0;
 755     if(decl->args) {
 756         arg_decl_t *arg;
 757         unsigned i;
 758
 759         for(arg = decl->args; arg; arg = arg->next)
 760             func->arg_cnt++;
 761
 762         func->args = compiler_alloc(ctx->code, func->arg_cnt * sizeof(arg_desc_t));
 763         if(!func->args)
 764             return E_OUTOFMEMORY;
 765
 766         for(i = 0, arg = decl->args; arg; arg = arg->next, i++) {
 767             func->args[i].name = compiler_alloc_string(ctx->code, arg->name);
 768             if(!func->args[i].name)
 769                 return E_OUTOFMEMORY;
 770             func->args[i].by_ref = arg->by_ref;
 771         }
 772     }else {
 773         func->args = NULL;
 774     }
 775
 776     hres = compile_func(ctx, decl->body, func);
 777     if(FAILED(hres))
 778         return hres;
 779
 780     *ret = func;
 781     return S_OK;
 782 }
 783
 784 static BOOL lookup_class_name(compile_ctx_t *ctx, const WCHAR *name)
 785 {
 786     class_desc_t *iter;
 787
 788     for(iter = ctx->classes; iter; iter = iter->next) {
 789         if(!strcmpiW(iter->name, name))
 790             return TRUE;
 791     }
 792
 793     return FALSE;
 794 }
 795
 796 static HRESULT compile_class(compile_ctx_t *ctx, class_decl_t *class_decl)
 797 {
 798     class_desc_t *class_desc;
 799
 800     if(lookup_dim_decls(ctx, class_decl->name) || lookup_funcs_name(ctx, class_decl->name)
 801             || lookup_class_name(ctx, class_decl->name)) {
 802         FIXME("%s: redefinition\n", debugstr_w(class_decl->name));
 803         return E_FAIL;
 804     }
 805
 806     class_desc = compiler_alloc(ctx->code, sizeof(*class_desc));
 807     if(!class_desc)
 808         return E_OUTOFMEMORY;
 809
 810     class_desc->name = compiler_alloc_string(ctx->code, class_decl->name);
 811     if(!class_desc->name)
 812         return E_OUTOFMEMORY;
 813
 814     class_desc->next = ctx->classes;
 815     ctx->classes = class_desc;
 816     return S_OK;
 817 }
 818
 819 static BOOL lookup_script_identifier(script_ctx_t *script, const WCHAR *identifier)
 820 {
 821     class_desc_t *class;
 822     dynamic_var_t *var;
 823     function_t *func;
 824
 825     for(var = script->global_vars; var; var = var->next) {
 826         if(!strcmpiW(var->name, identifier))
 827             return TRUE;
 828     }
 829
 830     for(func = script->global_funcs; func; func = func->next) {
 831         if(!strcmpiW(func->name, identifier))
 832             return TRUE;
 833     }
 834
 835     for(class = script->classes; class; class = class->next) {
 836         if(!strcmpiW(class->name, identifier))
 837             return TRUE;
 838     }
 839
 840     return FALSE;
 841 }
 842
 843 static HRESULT check_script_collisions(compile_ctx_t *ctx, script_ctx_t *script)
 844 {
 845     class_desc_t *class;
 846     dynamic_var_t *var;
 847     function_t *func;
 848
 849     for(var = ctx->global_vars; var; var = var->next) {
 850         if(lookup_script_identifier(script, var->name)) {
 851             FIXME("%s: redefined\n", debugstr_w(var->name));
 852             return E_FAIL;
 853         }
 854     }
 855
 856     for(func = ctx->funcs; func; func = func->next) {
 857         if(lookup_script_identifier(script, func->name)) {
 858             FIXME("%s: redefined\n", debugstr_w(func->name));
 859             return E_FAIL;
 860         }
 861     }
 862
 863     for(class = ctx->classes; class; class = class->next) {
 864         if(lookup_script_identifier(script, class->name)) {
 865             FIXME("%s: redefined\n", debugstr_w(class->name));
 866             return E_FAIL;
 867         }
 868     }
 869
 870     return S_OK;
 871 }
 872
 873 void release_vbscode(vbscode_t *code)
 874 {
 875     unsigned i;
 876
 877     list_remove(&code->entry);
 878
 879     for(i=0; i < code->bstr_cnt; i++)
 880         SysFreeString(code->bstr_pool[i]);
 881
 882     vbsheap_free(&code->heap);
 883
 884     heap_free(code->bstr_pool);
 885     heap_free(code->source);
 886     heap_free(code->instrs);
 887     heap_free(code);
 888 }
 889
 890 static vbscode_t *alloc_vbscode(compile_ctx_t *ctx, const WCHAR *source)
 891 {
 892     vbscode_t *ret;
 893
 894     ret = heap_alloc(sizeof(*ret));
 895     if(!ret)
 896         return NULL;
 897
 898     ret->source = heap_strdupW(source);
 899     if(!ret->source) {
 900         heap_free(ret);
 901         return NULL;
 902     }
 903
 904     ret->instrs = heap_alloc(32*sizeof(instr_t));
 905     if(!ret->instrs) {
 906         release_vbscode(ret);
 907         return NULL;
 908     }
 909
 910     ctx->instr_cnt = 0;
 911     ctx->instr_size = 32;
 912     vbsheap_init(&ret->heap);
 913
 914     ret->option_explicit = ctx->parser.option_explicit;
 915
 916     ret->bstr_pool = NULL;
 917     ret->bstr_pool_size = 0;
 918     ret->bstr_cnt = 0;
 919     ret->global_executed = FALSE;
 920
 921     ret->global_code.type = FUNC_GLOBAL;
 922     ret->global_code.name = NULL;
 923     ret->global_code.code_ctx = ret;
 924     ret->global_code.vars = NULL;
 925     ret->global_code.var_cnt = 0;
 926     ret->global_code.arg_cnt = 0;
 927     ret->global_code.args = NULL;
 928
 929     list_init(&ret->entry);
 930     return ret;
 931 }
 932
 933 static void release_compiler(compile_ctx_t *ctx)
 934 {
 935     parser_release(&ctx->parser);
 936     heap_free(ctx->labels);
 937     if(ctx->code)
 938         release_vbscode(ctx->code);
 939 }
 940
 941 HRESULT compile_script(script_ctx_t *script, const WCHAR *src, vbscode_t **ret)
 942 {
 943     function_t *new_func;
 944     function_decl_t *func_decl;
 945     class_decl_t *class_decl;
 946     compile_ctx_t ctx;
 947     vbscode_t *code;
 948     HRESULT hres;
 949
 950     hres = parse_script(&ctx.parser, src);
 951     if(FAILED(hres))
 952         return hres;
 953
 954     code = ctx.code = alloc_vbscode(&ctx, src);
 955     if(!ctx.code)
 956         return E_OUTOFMEMORY;
 957
 958     ctx.funcs = NULL;
 959     ctx.func_decls = NULL;
 960     ctx.global_vars = NULL;
 961     ctx.dim_decls = NULL;
 962     ctx.classes = NULL;
 963     ctx.labels = NULL;
 964     ctx.labels_cnt = ctx.labels_size = 0;
 965
 966     hres = compile_func(&ctx, ctx.parser.stats, &ctx.code->global_code);
 967     if(FAILED(hres)) {
 968         release_compiler(&ctx);
 969         return hres;
 970     }
 971
 972     for(func_decl = ctx.func_decls; func_decl; func_decl = func_decl->next) {
 973         hres = create_function(&ctx, func_decl, &new_func);
 974         if(FAILED(hres)) {
 975             release_compiler(&ctx);
 976             return hres;
 977         }
 978
 979         new_func->next = ctx.funcs;
 980         ctx.funcs = new_func;
 981     }
 982
 983     for(class_decl = ctx.parser.class_decls; class_decl; class_decl = class_decl->next) {
 984         hres = compile_class(&ctx, class_decl);
 985         if(FAILED(hres)) {
 986             release_compiler(&ctx);
 987             return hres;
 988         }
 989     }
 990
 991     hres = check_script_collisions(&ctx, script);
 992     if(FAILED(hres)) {
 993         release_compiler(&ctx);
 994         return hres;
 995     }
 996
 997     if(ctx.global_vars) {
 998         dynamic_var_t *var;
 999
1000         for(var = ctx.global_vars; var->next; var = var->next);
1001
1002         var->next = script->global_vars;
1003         script->global_vars = ctx.global_vars;
1004     }
1005
1006     if(ctx.funcs) {
1007         for(new_func = ctx.funcs; new_func->next; new_func = new_func->next);
1008
1009         new_func->next = script->global_funcs;
1010         script->global_funcs = ctx.funcs;
1011     }
1012
1013     if(ctx.classes) {
1014         class_desc_t *class = ctx.classes;
1015
1016         while(1) {
1017             class->ctx = script;
1018             if(!class->next)
1019                 break;
1020             class = class->next;
1021         }
1022
1023         class->next = script->classes;
1024         script->classes = ctx.classes;
1025     }
1026
1027     if(TRACE_ON(vbscript_disas))
1028         dump_code(&ctx);
1029
1030     ctx.code = NULL;
1031     release_compiler(&ctx);
1032
1033     list_add_tail(&script->code_list, &code->entry);
1034     *ret = code;
1035     return S_OK;
1036 }