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         hres = compile_expression(ctx, expr->obj_expr);
 322         if(FAILED(hres))
 323             return hres;
 324
 325         hres = push_instr_bstr_uint(ctx, ret_val ? OP_mcall : OP_mcallv, expr->identifier, arg_cnt);
 326     }else {
 327         hres = push_instr_bstr_uint(ctx, ret_val ? OP_icall : OP_icallv, expr->identifier, arg_cnt);
 328     }
 329
 330     return hres;
 331 }
 332
 333 static HRESULT compile_unary_expression(compile_ctx_t *ctx, unary_expression_t *expr, vbsop_t op)
 334 {
 335     HRESULT hres;
 336
 337     hres = compile_expression(ctx, expr->subexpr);
 338     if(FAILED(hres))
 339         return hres;
 340
 341     return push_instr(ctx, op) == -1 ? E_OUTOFMEMORY : S_OK;
 342 }
 343
 344 static HRESULT compile_binary_expression(compile_ctx_t *ctx, binary_expression_t *expr, vbsop_t op)
 345 {
 346     HRESULT hres;
 347
 348     hres = compile_expression(ctx, expr->left);
 349     if(FAILED(hres))
 350         return hres;
 351
 352     hres = compile_expression(ctx, expr->right);
 353     if(FAILED(hres))
 354         return hres;
 355
 356     return push_instr(ctx, op) == -1 ? E_OUTOFMEMORY : S_OK;
 357 }
 358
 359 static HRESULT compile_expression(compile_ctx_t *ctx, expression_t *expr)
 360 {
 361     switch(expr->type) {
 362     case EXPR_ADD:
 363         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_add);
 364     case EXPR_AND:
 365         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_and);
 366     case EXPR_BOOL:
 367         return push_instr_int(ctx, OP_bool, ((bool_expression_t*)expr)->value);
 368     case EXPR_CONCAT:
 369         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_concat);
 370     case EXPR_DIV:
 371         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_div);
 372     case EXPR_DOUBLE:
 373         return push_instr_double(ctx, OP_double, ((double_expression_t*)expr)->value);
 374     case EXPR_EMPTY:
 375         return push_instr(ctx, OP_empty) != -1 ? S_OK : E_OUTOFMEMORY;
 376     case EXPR_EQUAL:
 377         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_equal);
 378     case EXPR_EQV:
 379         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_eqv);
 380     case EXPR_EXP:
 381         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_exp);
 382     case EXPR_IDIV:
 383         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_idiv);
 384     case EXPR_IMP:
 385         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_imp);
 386     case EXPR_MEMBER:
 387         return compile_member_expression(ctx, (member_expression_t*)expr, TRUE);
 388     case EXPR_MOD:
 389         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_mod);
 390     case EXPR_MUL:
 391         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_mul);
 392     case EXPR_NEG:
 393         return compile_unary_expression(ctx, (unary_expression_t*)expr, OP_neg);
 394     case EXPR_NEQUAL:
 395         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_nequal);
 396     case EXPR_NEW:
 397         return push_instr_str(ctx, OP_new, ((string_expression_t*)expr)->value);
 398     case EXPR_NOT:
 399         return compile_unary_expression(ctx, (unary_expression_t*)expr, OP_not);
 400     case EXPR_NOTHING:
 401         return push_instr(ctx, OP_nothing) != -1 ? S_OK : E_OUTOFMEMORY;
 402     case EXPR_NULL:
 403         return push_instr(ctx, OP_null) != -1 ? S_OK : E_OUTOFMEMORY;
 404     case EXPR_OR:
 405         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_or);
 406     case EXPR_STRING:
 407         return push_instr_str(ctx, OP_string, ((string_expression_t*)expr)->value);
 408     case EXPR_SUB:
 409         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_sub);
 410     case EXPR_USHORT:
 411         return push_instr_int(ctx, OP_short, ((int_expression_t*)expr)->value);
 412     case EXPR_ULONG:
 413         return push_instr_int(ctx, OP_long, ((int_expression_t*)expr)->value);
 414     case EXPR_XOR:
 415         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_xor);
 416     default:
 417         FIXME("Unimplemented expression type %d\n", expr->type);
 418         return E_NOTIMPL;
 419     }
 420
 421     return S_OK;
 422 }
 423
 424 static HRESULT compile_if_statement(compile_ctx_t *ctx, if_statement_t *stat)
 425 {
 426     unsigned cnd_jmp, endif_label = -1;
 427     elseif_decl_t *elseif_decl;
 428     HRESULT hres;
 429
 430     hres = compile_expression(ctx, stat->expr);
 431     if(FAILED(hres))
 432         return hres;
 433
 434     cnd_jmp = push_instr(ctx, OP_jmp_false);
 435     if(cnd_jmp == -1)
 436         return E_OUTOFMEMORY;
 437
 438     hres = compile_statement(ctx, stat->if_stat);
 439     if(FAILED(hres))
 440         return hres;
 441
 442     if(stat->else_stat || stat->elseifs) {
 443         endif_label = alloc_label(ctx);
 444         if(endif_label == -1)
 445             return E_OUTOFMEMORY;
 446
 447         hres = push_instr_addr(ctx, OP_jmp, endif_label);
 448         if(FAILED(hres))
 449             return hres;
 450     }
 451
 452     for(elseif_decl = stat->elseifs; elseif_decl; elseif_decl = elseif_decl->next) {
 453         instr_ptr(ctx, cnd_jmp)->arg1.uint = ctx->instr_cnt;
 454
 455         hres = compile_expression(ctx, elseif_decl->expr);
 456         if(FAILED(hres))
 457             return hres;
 458
 459         cnd_jmp = push_instr(ctx, OP_jmp_false);
 460         if(cnd_jmp == -1)
 461             return E_OUTOFMEMORY;
 462
 463         hres = compile_statement(ctx, elseif_decl->stat);
 464         if(FAILED(hres))
 465             return hres;
 466
 467         hres = push_instr_addr(ctx, OP_jmp, endif_label);
 468         if(FAILED(hres))
 469             return hres;
 470     }
 471
 472     instr_ptr(ctx, cnd_jmp)->arg1.uint = ctx->instr_cnt;
 473
 474     if(stat->else_stat) {
 475         hres = compile_statement(ctx, stat->else_stat);
 476         if(FAILED(hres))
 477             return hres;
 478     }
 479
 480     if(endif_label != -1)
 481         label_set_addr(ctx, endif_label);
 482     return S_OK;
 483 }
 484
 485 static HRESULT compile_assign_statement(compile_ctx_t *ctx, assign_statement_t *stat, BOOL is_set)
 486 {
 487     HRESULT hres;
 488
 489     hres = compile_expression(ctx, stat->value_expr);
 490     if(FAILED(hres))
 491         return hres;
 492
 493     if(stat->member_expr->args) {
 494         FIXME("arguments support not implemented\n");
 495         return E_NOTIMPL;
 496     }
 497
 498     if(stat->member_expr->obj_expr) {
 499         hres = compile_expression(ctx, stat->member_expr->obj_expr);
 500         if(FAILED(hres))
 501             return hres;
 502
 503         hres = push_instr_bstr(ctx, is_set ? OP_set_member : OP_assign_member, stat->member_expr->identifier);
 504     }else {
 505         hres = push_instr_bstr(ctx, is_set ? OP_set_ident : OP_assign_ident, stat->member_expr->identifier);
 506     }
 507
 508     return hres;
 509 }
 510
 511 static BOOL lookup_dim_decls(compile_ctx_t *ctx, const WCHAR *name)
 512 {
 513     dim_decl_t *dim_decl;
 514
 515     for(dim_decl = ctx->dim_decls; dim_decl; dim_decl = dim_decl->next) {
 516         if(!strcmpiW(dim_decl->name, name))
 517             return TRUE;
 518     }
 519
 520     return FALSE;
 521 }
 522
 523 static BOOL lookup_args_name(compile_ctx_t *ctx, const WCHAR *name)
 524 {
 525     unsigned i;
 526
 527     for(i = 0; i < ctx->func->arg_cnt; i++) {
 528         if(!strcmpiW(ctx->func->args[i].name, name))
 529             return TRUE;
 530     }
 531
 532     return FALSE;
 533 }
 534
 535 static HRESULT compile_dim_statement(compile_ctx_t *ctx, dim_statement_t *stat)
 536 {
 537     dim_decl_t *dim_decl = stat->dim_decls;
 538
 539     while(1) {
 540         if(lookup_dim_decls(ctx, dim_decl->name) || lookup_args_name(ctx, dim_decl->name)) {
 541             FIXME("dim %s name redefined\n", debugstr_w(dim_decl->name));
 542             return E_FAIL;
 543         }
 544
 545         if(!dim_decl->next)
 546             break;
 547         dim_decl = dim_decl->next;
 548     }
 549
 550     dim_decl->next = ctx->dim_decls;
 551     ctx->dim_decls = stat->dim_decls;
 552     ctx->func->var_cnt++;
 553     return S_OK;
 554 }
 555
 556 static HRESULT compile_function_statement(compile_ctx_t *ctx, function_statement_t *stat)
 557 {
 558     if(ctx->func != &ctx->code->global_code) {
 559         FIXME("Function is not in the global code\n");
 560         return E_FAIL;
 561     }
 562
 563     stat->func_decl->next = ctx->func_decls;
 564     ctx->func_decls = stat->func_decl;
 565     return S_OK;
 566 }
 567
 568 static HRESULT compile_exitsub_statement(compile_ctx_t *ctx)
 569 {
 570     if(ctx->sub_end_label == -1) {
 571         FIXME("Exit Sub outside Sub?\n");
 572         return E_FAIL;
 573     }
 574
 575     return push_instr_addr(ctx, OP_jmp, ctx->sub_end_label);
 576 }
 577
 578 static HRESULT compile_exitfunc_statement(compile_ctx_t *ctx)
 579 {
 580     if(ctx->func_end_label == -1) {
 581         FIXME("Exit Function outside Function?\n");
 582         return E_FAIL;
 583     }
 584
 585     return push_instr_addr(ctx, OP_jmp, ctx->func_end_label);
 586 }
 587
 588 static HRESULT compile_statement(compile_ctx_t *ctx, statement_t *stat)
 589 {
 590     HRESULT hres;
 591
 592     while(stat) {
 593         switch(stat->type) {
 594         case STAT_ASSIGN:
 595             hres = compile_assign_statement(ctx, (assign_statement_t*)stat, FALSE);
 596             break;
 597         case STAT_CALL:
 598             hres = compile_member_expression(ctx, ((call_statement_t*)stat)->expr, FALSE);
 599             break;
 600         case STAT_DIM:
 601             hres = compile_dim_statement(ctx, (dim_statement_t*)stat);
 602             break;
 603         case STAT_EXITFUNC:
 604             hres = compile_exitfunc_statement(ctx);
 605             break;
 606         case STAT_EXITSUB:
 607             hres = compile_exitsub_statement(ctx);
 608             break;
 609         case STAT_FUNC:
 610             hres = compile_function_statement(ctx, (function_statement_t*)stat);
 611             break;
 612         case STAT_IF:
 613             hres = compile_if_statement(ctx, (if_statement_t*)stat);
 614             break;
 615         case STAT_SET:
 616             hres = compile_assign_statement(ctx, (assign_statement_t*)stat, TRUE);
 617             break;
 618         case STAT_STOP:
 619             hres = push_instr(ctx, OP_stop) == -1 ? E_OUTOFMEMORY : S_OK;
 620             break;
 621         default:
 622             FIXME("Unimplemented statement type %d\n", stat->type);
 623             hres = E_NOTIMPL;
 624         }
 625
 626         if(FAILED(hres))
 627             return hres;
 628         stat = stat->next;
 629     }
 630
 631     return S_OK;
 632 }
 633
 634 static void resolve_labels(compile_ctx_t *ctx, unsigned off)
 635 {
 636     instr_t *instr;
 637
 638     for(instr = ctx->code->instrs+off; instr < ctx->code->instrs+ctx->instr_cnt; instr++) {
 639         if(instr_info[instr->op].arg1_type == ARG_ADDR && (instr->arg1.uint & LABEL_FLAG)) {
 640             assert((instr->arg1.uint & ~LABEL_FLAG) < ctx->labels_cnt);
 641             instr->arg1.uint = ctx->labels[instr->arg1.uint & ~LABEL_FLAG];
 642         }
 643         assert(instr_info[instr->op].arg2_type != ARG_ADDR);
 644     }
 645
 646     ctx->labels_cnt = 0;
 647 }
 648
 649 static HRESULT compile_func(compile_ctx_t *ctx, statement_t *stat, function_t *func)
 650 {
 651     HRESULT hres;
 652
 653     func->code_off = ctx->instr_cnt;
 654
 655     ctx->sub_end_label = -1;
 656     ctx->func_end_label = -1;
 657
 658     switch(func->type) {
 659     case FUNC_FUNCTION:
 660         ctx->func_end_label = alloc_label(ctx);
 661         if(ctx->func_end_label == -1)
 662             return E_OUTOFMEMORY; /* FIXME ! */
 663         break;
 664     case FUNC_SUB:
 665         ctx->sub_end_label = alloc_label(ctx);
 666         if(ctx->sub_end_label == -1)
 667             return E_OUTOFMEMORY;
 668         break;
 669     case FUNC_GLOBAL:
 670         break;
 671     }
 672
 673     ctx->func = func;
 674     ctx->dim_decls = NULL;
 675     hres = compile_statement(ctx, stat);
 676     ctx->func = NULL;
 677     if(FAILED(hres))
 678         return hres;
 679
 680     if(ctx->sub_end_label != -1)
 681         label_set_addr(ctx, ctx->sub_end_label);
 682     if(ctx->func_end_label != -1)
 683         label_set_addr(ctx, ctx->func_end_label);
 684
 685     if(push_instr(ctx, OP_ret) == -1)
 686         return E_OUTOFMEMORY;
 687
 688     resolve_labels(ctx, func->code_off);
 689
 690     if(func->var_cnt) {
 691         dim_decl_t *dim_decl;
 692
 693         if(func->type == FUNC_GLOBAL) {
 694             dynamic_var_t *new_var;
 695
 696             func->var_cnt = 0;
 697
 698             for(dim_decl = ctx->dim_decls; dim_decl; dim_decl = dim_decl->next) {
 699                 new_var = compiler_alloc(ctx->code, sizeof(*new_var));
 700                 if(!new_var)
 701                     return E_OUTOFMEMORY;
 702
 703                 new_var->name = compiler_alloc_string(ctx->code, dim_decl->name);
 704                 if(!new_var->name)
 705                     return E_OUTOFMEMORY;
 706
 707                 V_VT(&new_var->v) = VT_EMPTY;
 708
 709                 new_var->next = ctx->global_vars;
 710                 ctx->global_vars = new_var;
 711             }
 712         }else {
 713             unsigned i;
 714
 715             func->vars = compiler_alloc(ctx->code, func->var_cnt * sizeof(var_desc_t));
 716             if(!func->vars)
 717                 return E_OUTOFMEMORY;
 718
 719             for(dim_decl = ctx->dim_decls, i=0; dim_decl; dim_decl = dim_decl->next, i++) {
 720                 func->vars[i].name = compiler_alloc_string(ctx->code, dim_decl->name);
 721                 if(!func->vars[i].name)
 722                     return E_OUTOFMEMORY;
 723             }
 724
 725             assert(i == func->var_cnt);
 726         }
 727     }
 728
 729     return S_OK;
 730 }
 731
 732 static BOOL lookup_funcs_name(compile_ctx_t *ctx, const WCHAR *name)
 733 {
 734     function_t *iter;
 735
 736     for(iter = ctx->funcs; iter; iter = iter->next) {
 737         if(!strcmpiW(iter->name, name))
 738             return TRUE;
 739     }
 740
 741     return FALSE;
 742 }
 743
 744 static HRESULT create_function(compile_ctx_t *ctx, function_decl_t *decl, function_t **ret)
 745 {
 746     function_t *func;
 747     HRESULT hres;
 748
 749     if(lookup_dim_decls(ctx, decl->name) || lookup_funcs_name(ctx, decl->name)) {
 750         FIXME("%s: redefinition\n", debugstr_w(decl->name));
 751         return E_FAIL;
 752     }
 753
 754     func = compiler_alloc(ctx->code, sizeof(*func));
 755     if(!func)
 756         return E_OUTOFMEMORY;
 757
 758     func->name = compiler_alloc_string(ctx->code, decl->name);
 759     if(!func->name)
 760         return E_OUTOFMEMORY;
 761
 762     func->vars = NULL;
 763     func->var_cnt = 0;
 764     func->code_ctx = ctx->code;
 765     func->type = decl->type;
 766     func->is_public = decl->is_public;
 767
 768     func->arg_cnt = 0;
 769     if(decl->args) {
 770         arg_decl_t *arg;
 771         unsigned i;
 772
 773         for(arg = decl->args; arg; arg = arg->next)
 774             func->arg_cnt++;
 775
 776         func->args = compiler_alloc(ctx->code, func->arg_cnt * sizeof(arg_desc_t));
 777         if(!func->args)
 778             return E_OUTOFMEMORY;
 779
 780         for(i = 0, arg = decl->args; arg; arg = arg->next, i++) {
 781             func->args[i].name = compiler_alloc_string(ctx->code, arg->name);
 782             if(!func->args[i].name)
 783                 return E_OUTOFMEMORY;
 784             func->args[i].by_ref = arg->by_ref;
 785         }
 786     }else {
 787         func->args = NULL;
 788     }
 789
 790     hres = compile_func(ctx, decl->body, func);
 791     if(FAILED(hres))
 792         return hres;
 793
 794     *ret = func;
 795     return S_OK;
 796 }
 797
 798 static BOOL lookup_class_name(compile_ctx_t *ctx, const WCHAR *name)
 799 {
 800     class_desc_t *iter;
 801
 802     for(iter = ctx->classes; iter; iter = iter->next) {
 803         if(!strcmpiW(iter->name, name))
 804             return TRUE;
 805     }
 806
 807     return FALSE;
 808 }
 809
 810 static HRESULT create_class_funcprop(compile_ctx_t *ctx, function_decl_t *func_decl, vbdisp_funcprop_desc_t *desc)
 811 {
 812     desc->name = compiler_alloc_string(ctx->code, func_decl->name);
 813     if(!desc->name)
 814         return E_OUTOFMEMORY;
 815
 816     assert(!desc->entries[0]);
 817
 818     if(func_decl->is_public)
 819         desc->is_public = TRUE;
 820
 821     return create_function(ctx, func_decl, desc->entries);
 822 }
 823
 824 static HRESULT compile_class(compile_ctx_t *ctx, class_decl_t *class_decl)
 825 {
 826     function_decl_t *func_decl;
 827     class_desc_t *class_desc;
 828     unsigned i;
 829     HRESULT hres;
 830
 831     if(lookup_dim_decls(ctx, class_decl->name) || lookup_funcs_name(ctx, class_decl->name)
 832             || lookup_class_name(ctx, class_decl->name)) {
 833         FIXME("%s: redefinition\n", debugstr_w(class_decl->name));
 834         return E_FAIL;
 835     }
 836
 837     class_desc = compiler_alloc(ctx->code, sizeof(*class_desc));
 838     if(!class_desc)
 839         return E_OUTOFMEMORY;
 840
 841     class_desc->name = compiler_alloc_string(ctx->code, class_decl->name);
 842     if(!class_desc->name)
 843         return E_OUTOFMEMORY;
 844
 845     class_desc->func_cnt = 1; /* always allocate slot for default getter */
 846
 847     for(func_decl = class_decl->funcs; func_decl; func_decl = func_decl->next)
 848         class_desc->func_cnt++;
 849
 850     class_desc->funcs = compiler_alloc(ctx->code, class_desc->func_cnt*sizeof(*class_desc->funcs));
 851     if(!class_desc->funcs)
 852         return E_OUTOFMEMORY;
 853     memset(class_desc->funcs, 0, class_desc->func_cnt*sizeof(*class_desc->funcs));
 854
 855     for(func_decl = class_decl->funcs, i=1; func_decl; func_decl = func_decl->next, i++) {
 856         hres = create_class_funcprop(ctx, func_decl, class_desc->funcs + i);
 857         if(FAILED(hres))
 858             return hres;
 859     }
 860
 861     class_desc->next = ctx->classes;
 862     ctx->classes = class_desc;
 863     return S_OK;
 864 }
 865
 866 static BOOL lookup_script_identifier(script_ctx_t *script, const WCHAR *identifier)
 867 {
 868     class_desc_t *class;
 869     dynamic_var_t *var;
 870     function_t *func;
 871
 872     for(var = script->global_vars; var; var = var->next) {
 873         if(!strcmpiW(var->name, identifier))
 874             return TRUE;
 875     }
 876
 877     for(func = script->global_funcs; func; func = func->next) {
 878         if(!strcmpiW(func->name, identifier))
 879             return TRUE;
 880     }
 881
 882     for(class = script->classes; class; class = class->next) {
 883         if(!strcmpiW(class->name, identifier))
 884             return TRUE;
 885     }
 886
 887     return FALSE;
 888 }
 889
 890 static HRESULT check_script_collisions(compile_ctx_t *ctx, script_ctx_t *script)
 891 {
 892     class_desc_t *class;
 893     dynamic_var_t *var;
 894     function_t *func;
 895
 896     for(var = ctx->global_vars; var; var = var->next) {
 897         if(lookup_script_identifier(script, var->name)) {
 898             FIXME("%s: redefined\n", debugstr_w(var->name));
 899             return E_FAIL;
 900         }
 901     }
 902
 903     for(func = ctx->funcs; func; func = func->next) {
 904         if(lookup_script_identifier(script, func->name)) {
 905             FIXME("%s: redefined\n", debugstr_w(func->name));
 906             return E_FAIL;
 907         }
 908     }
 909
 910     for(class = ctx->classes; class; class = class->next) {
 911         if(lookup_script_identifier(script, class->name)) {
 912             FIXME("%s: redefined\n", debugstr_w(class->name));
 913             return E_FAIL;
 914         }
 915     }
 916
 917     return S_OK;
 918 }
 919
 920 void release_vbscode(vbscode_t *code)
 921 {
 922     unsigned i;
 923
 924     list_remove(&code->entry);
 925
 926     for(i=0; i < code->bstr_cnt; i++)
 927         SysFreeString(code->bstr_pool[i]);
 928
 929     vbsheap_free(&code->heap);
 930
 931     heap_free(code->bstr_pool);
 932     heap_free(code->source);
 933     heap_free(code->instrs);
 934     heap_free(code);
 935 }
 936
 937 static vbscode_t *alloc_vbscode(compile_ctx_t *ctx, const WCHAR *source)
 938 {
 939     vbscode_t *ret;
 940
 941     ret = heap_alloc(sizeof(*ret));
 942     if(!ret)
 943         return NULL;
 944
 945     ret->source = heap_strdupW(source);
 946     if(!ret->source) {
 947         heap_free(ret);
 948         return NULL;
 949     }
 950
 951     ret->instrs = heap_alloc(32*sizeof(instr_t));
 952     if(!ret->instrs) {
 953         release_vbscode(ret);
 954         return NULL;
 955     }
 956
 957     ctx->instr_cnt = 0;
 958     ctx->instr_size = 32;
 959     vbsheap_init(&ret->heap);
 960
 961     ret->option_explicit = ctx->parser.option_explicit;
 962
 963     ret->bstr_pool = NULL;
 964     ret->bstr_pool_size = 0;
 965     ret->bstr_cnt = 0;
 966     ret->global_executed = FALSE;
 967
 968     ret->global_code.type = FUNC_GLOBAL;
 969     ret->global_code.name = NULL;
 970     ret->global_code.code_ctx = ret;
 971     ret->global_code.vars = NULL;
 972     ret->global_code.var_cnt = 0;
 973     ret->global_code.arg_cnt = 0;
 974     ret->global_code.args = NULL;
 975
 976     list_init(&ret->entry);
 977     return ret;
 978 }
 979
 980 static void release_compiler(compile_ctx_t *ctx)
 981 {
 982     parser_release(&ctx->parser);
 983     heap_free(ctx->labels);
 984     if(ctx->code)
 985         release_vbscode(ctx->code);
 986 }
 987
 988 HRESULT compile_script(script_ctx_t *script, const WCHAR *src, vbscode_t **ret)
 989 {
 990     function_t *new_func;
 991     function_decl_t *func_decl;
 992     class_decl_t *class_decl;
 993     compile_ctx_t ctx;
 994     vbscode_t *code;
 995     HRESULT hres;
 996
 997     hres = parse_script(&ctx.parser, src);
 998     if(FAILED(hres))
 999         return hres;
1000
1001     code = ctx.code = alloc_vbscode(&ctx, src);
1002     if(!ctx.code)
1003         return E_OUTOFMEMORY;
1004
1005     ctx.funcs = NULL;
1006     ctx.func_decls = NULL;
1007     ctx.global_vars = NULL;
1008     ctx.dim_decls = NULL;
1009     ctx.classes = NULL;
1010     ctx.labels = NULL;
1011     ctx.labels_cnt = ctx.labels_size = 0;
1012
1013     hres = compile_func(&ctx, ctx.parser.stats, &ctx.code->global_code);
1014     if(FAILED(hres)) {
1015         release_compiler(&ctx);
1016         return hres;
1017     }
1018
1019     for(func_decl = ctx.func_decls; func_decl; func_decl = func_decl->next) {
1020         hres = create_function(&ctx, func_decl, &new_func);
1021         if(FAILED(hres)) {
1022             release_compiler(&ctx);
1023             return hres;
1024         }
1025
1026         new_func->next = ctx.funcs;
1027         ctx.funcs = new_func;
1028     }
1029
1030     for(class_decl = ctx.parser.class_decls; class_decl; class_decl = class_decl->next) {
1031         hres = compile_class(&ctx, class_decl);
1032         if(FAILED(hres)) {
1033             release_compiler(&ctx);
1034             return hres;
1035         }
1036     }
1037
1038     hres = check_script_collisions(&ctx, script);
1039     if(FAILED(hres)) {
1040         release_compiler(&ctx);
1041         return hres;
1042     }
1043
1044     if(ctx.global_vars) {
1045         dynamic_var_t *var;
1046
1047         for(var = ctx.global_vars; var->next; var = var->next);
1048
1049         var->next = script->global_vars;
1050         script->global_vars = ctx.global_vars;
1051     }
1052
1053     if(ctx.funcs) {
1054         for(new_func = ctx.funcs; new_func->next; new_func = new_func->next);
1055
1056         new_func->next = script->global_funcs;
1057         script->global_funcs = ctx.funcs;
1058     }
1059
1060     if(ctx.classes) {
1061         class_desc_t *class = ctx.classes;
1062
1063         while(1) {
1064             class->ctx = script;
1065             if(!class->next)
1066                 break;
1067             class = class->next;
1068         }
1069
1070         class->next = script->classes;
1071         script->classes = ctx.classes;
1072     }
1073
1074     if(TRACE_ON(vbscript_disas))
1075         dump_code(&ctx);
1076
1077     ctx.code = NULL;
1078     release_compiler(&ctx);
1079
1080     list_add_tail(&script->code_list, &code->entry);
1081     *ret = code;
1082     return S_OK;
1083 }