dlls/jscript/function.c

   1 /*
   2  * Copyright 2008 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 "jscript.h"
  22 #include "engine.h"
  23
  24 #include "wine/debug.h"
  25
  26 WINE_DEFAULT_DEBUG_CHANNEL(jscript);
  27
  28 typedef struct {
  29     jsdisp_t dispex;
  30     builtin_invoke_t value_proc;
  31     const WCHAR *name;
  32     DWORD flags;
  33     scope_chain_t *scope_chain;
  34     bytecode_t *code;
  35     function_code_t *func_code;
  36     DWORD length;
  37     jsdisp_t *arguments;
  38 } FunctionInstance;
  39
  40 static inline FunctionInstance *function_from_vdisp(vdisp_t *vdisp)
  41 {
  42     return (FunctionInstance*)vdisp->u.jsdisp;
  43 }
  44
  45 static inline FunctionInstance *function_this(vdisp_t *jsthis)
  46 {
  47     return is_vclass(jsthis, JSCLASS_FUNCTION) ? function_from_vdisp(jsthis) : NULL;
  48 }
  49
  50 static const WCHAR prototypeW[] = {'p','r','o','t','o','t', 'y', 'p','e',0};
  51
  52 static const WCHAR lengthW[] = {'l','e','n','g','t','h',0};
  53 static const WCHAR toStringW[] = {'t','o','S','t','r','i','n','g',0};
  54 static const WCHAR applyW[] = {'a','p','p','l','y',0};
  55 static const WCHAR callW[] = {'c','a','l','l',0};
  56 static const WCHAR argumentsW[] = {'a','r','g','u','m','e','n','t','s',0};
  57
  58 static HRESULT init_parameters(jsdisp_t *var_disp, FunctionInstance *function, unsigned argc, jsval_t *argv)
  59 {
  60     DWORD i=0;
  61     HRESULT hres;
  62
  63     for(i=0; i < function->func_code->param_cnt; i++) {
  64         hres = jsdisp_propput_name(var_disp, function->func_code->params[i],
  65                 i < argc ? argv[i] : jsval_undefined());
  66         if(FAILED(hres))
  67             return hres;
  68     }
  69
  70     return S_OK;
  71 }
  72
  73 static HRESULT Arguments_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
  74         jsval_t *r)
  75 {
  76     FIXME("\n");
  77     return E_NOTIMPL;
  78 }
  79
  80 static const builtin_info_t Arguments_info = {
  81     JSCLASS_ARGUMENTS,
  82     {NULL, Arguments_value, 0},
  83     0, NULL,
  84     NULL,
  85     NULL
  86 };
  87
  88 static HRESULT create_arguments(script_ctx_t *ctx, IDispatch *calee, unsigned argc, jsval_t *argv, jsdisp_t **ret)
  89 {
  90     jsdisp_t *args;
  91     DWORD i;
  92     HRESULT hres;
  93
  94     static const WCHAR caleeW[] = {'c','a','l','l','e','e',0};
  95
  96     args = heap_alloc_zero(sizeof(jsdisp_t));
  97     if(!args)
  98         return E_OUTOFMEMORY;
  99
 100     hres = init_dispex_from_constr(args, ctx, &Arguments_info, ctx->object_constr);
 101     if(FAILED(hres)) {
 102         heap_free(args);
 103         return hres;
 104     }
 105
 106     for(i=0; i < argc; i++) {
 107         WCHAR buf[12];
 108
 109         static const WCHAR formatW[] = {'%','d',0};
 110
 111         sprintfW(buf, formatW, i);
 112         hres = jsdisp_propput_dontenum(args, buf, argv[i]);
 113         if(FAILED(hres))
 114             break;
 115     }
 116
 117     if(SUCCEEDED(hres)) {
 118         hres = jsdisp_propput_dontenum(args, lengthW, jsval_number(argc));
 119
 120         if(SUCCEEDED(hres))
 121             hres = jsdisp_propput_dontenum(args, caleeW, jsval_disp(calee));
 122     }
 123
 124     if(FAILED(hres)) {
 125         jsdisp_release(args);
 126         return hres;
 127     }
 128
 129     *ret = args;
 130     return S_OK;
 131 }
 132
 133 static HRESULT create_var_disp(script_ctx_t *ctx, FunctionInstance *function, jsdisp_t *arg_disp,
 134         unsigned argc, jsval_t *argv, jsdisp_t **ret)
 135 {
 136     jsdisp_t *var_disp;
 137     HRESULT hres;
 138
 139     hres = create_dispex(ctx, NULL, NULL, &var_disp);
 140     if(FAILED(hres))
 141         return hres;
 142
 143     hres = jsdisp_propput_name(var_disp, argumentsW, jsval_obj(arg_disp));
 144     if(SUCCEEDED(hres))
 145         hres = init_parameters(var_disp, function, argc, argv);
 146     if(FAILED(hres)) {
 147         jsdisp_release(var_disp);
 148         return hres;
 149     }
 150
 151     *ret = var_disp;
 152     return S_OK;
 153 }
 154
 155 static HRESULT invoke_source(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_obj, unsigned argc, jsval_t *argv,
 156         jsval_t *r)
 157 {
 158     jsdisp_t *var_disp, *arg_disp;
 159     exec_ctx_t *exec_ctx;
 160     scope_chain_t *scope;
 161     HRESULT hres;
 162
 163     if(!function->func_code) {
 164         FIXME("no source\n");
 165         return E_FAIL;
 166     }
 167
 168     hres = create_arguments(ctx, to_disp(&function->dispex), argc, argv, &arg_disp);
 169     if(FAILED(hres))
 170         return hres;
 171
 172     hres = create_var_disp(ctx, function, arg_disp, argc, argv, &var_disp);
 173     if(FAILED(hres)) {
 174         jsdisp_release(arg_disp);
 175         return hres;
 176     }
 177
 178     hres = scope_push(function->scope_chain, var_disp, to_disp(var_disp), &scope);
 179     if(SUCCEEDED(hres)) {
 180         hres = create_exec_ctx(ctx, this_obj, var_disp, scope, FALSE, &exec_ctx);
 181         scope_release(scope);
 182     }
 183     jsdisp_release(var_disp);
 184     if(SUCCEEDED(hres)) {
 185         jsdisp_t *prev_args;
 186
 187         prev_args = function->arguments;
 188         function->arguments = arg_disp;
 189         hres = exec_source(exec_ctx, function->code, function->func_code, FALSE, r);
 190         function->arguments = prev_args;
 191     }
 192
 193     jsdisp_release(arg_disp);
 194     exec_release(exec_ctx);
 195     return hres;
 196 }
 197
 198 static HRESULT invoke_constructor(script_ctx_t *ctx, FunctionInstance *function, unsigned argc, jsval_t *argv,
 199         jsval_t *r)
 200 {
 201     jsdisp_t *this_obj;
 202     jsval_t var;
 203     HRESULT hres;
 204
 205     hres = create_object(ctx, &function->dispex, &this_obj);
 206     if(FAILED(hres))
 207         return hres;
 208
 209     hres = invoke_source(ctx, function, to_disp(this_obj), argc, argv, &var);
 210     if(FAILED(hres)) {
 211         jsdisp_release(this_obj);
 212         return hres;
 213     }
 214
 215     if(is_object_instance(var)) {
 216         jsdisp_release(this_obj);
 217         *r = var;
 218     }else {
 219         jsval_release(var);
 220         *r = jsval_obj(this_obj);
 221     }
 222     return S_OK;
 223 }
 224
 225 static HRESULT invoke_value_proc(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_disp, WORD flags,
 226         unsigned argc, jsval_t *argv, jsval_t *r)
 227 {
 228     vdisp_t vthis;
 229     HRESULT hres;
 230
 231     if(this_disp)
 232         set_disp(&vthis, this_disp);
 233     else if(ctx->host_global)
 234         set_disp(&vthis, ctx->host_global);
 235     else
 236         set_jsdisp(&vthis, ctx->global);
 237
 238     hres = function->value_proc(ctx, &vthis, flags, argc, argv, r);
 239
 240     vdisp_release(&vthis);
 241     return hres;
 242 }
 243
 244 static HRESULT call_function(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_obj,
 245         unsigned argc, jsval_t *argv, jsval_t *r)
 246 {
 247     if(function->value_proc)
 248         return invoke_value_proc(ctx, function, this_obj, DISPATCH_METHOD, argc, argv, r);
 249
 250     return invoke_source(ctx, function, this_obj, argc, argv, r);
 251 }
 252
 253 static HRESULT function_to_string(FunctionInstance *function, jsstr_t **ret)
 254 {
 255     jsstr_t *str;
 256
 257     static const WCHAR native_prefixW[] = {'\n','f','u','n','c','t','i','o','n',' '};
 258     static const WCHAR native_suffixW[] =
 259         {'(',')',' ','{','\n',' ',' ',' ',' ','[','n','a','t','i','v','e',' ','c','o','d','e',']','\n','}','\n'};
 260
 261     if(function->value_proc) {
 262         DWORD name_len;
 263
 264         name_len = strlenW(function->name);
 265         str = jsstr_alloc_buf((sizeof(native_prefixW)+sizeof(native_suffixW))/sizeof(WCHAR) + name_len);
 266         if(!str)
 267             return E_OUTOFMEMORY;
 268
 269         memcpy(str->str, native_prefixW, sizeof(native_prefixW));
 270         memcpy(str->str + sizeof(native_prefixW)/sizeof(WCHAR), function->name, name_len*sizeof(WCHAR));
 271         memcpy(str->str + sizeof(native_prefixW)/sizeof(WCHAR) + name_len, native_suffixW, sizeof(native_suffixW));
 272     }else {
 273         str = jsstr_alloc_len(function->func_code->source, function->func_code->source_len);
 274         if(!str)
 275             return E_OUTOFMEMORY;
 276     }
 277
 278     *ret = str;
 279     return S_OK;
 280 }
 281
 282 HRESULT Function_invoke(jsdisp_t *func_this, IDispatch *jsthis, WORD flags, unsigned argc, jsval_t *argv, jsval_t *r)
 283 {
 284     FunctionInstance *function;
 285
 286     TRACE("func %p this %p\n", func_this, jsthis);
 287
 288     assert(is_class(func_this, JSCLASS_FUNCTION));
 289     function = (FunctionInstance*)func_this;
 290
 291     if(function->value_proc)
 292         return invoke_value_proc(function->dispex.ctx, function, jsthis, flags, argc, argv, r);
 293
 294     if(flags == DISPATCH_CONSTRUCT)
 295         return invoke_constructor(function->dispex.ctx, function, argc, argv, r);
 296
 297     assert(flags == DISPATCH_METHOD);
 298     return invoke_source(function->dispex.ctx, function, jsthis, argc, argv, r);
 299 }
 300
 301 static HRESULT Function_length(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
 302         jsval_t *r)
 303 {
 304     FunctionInstance *This = function_from_vdisp(jsthis);
 305
 306     TRACE("%p %d\n", This, This->length);
 307
 308     switch(flags) {
 309     case DISPATCH_PROPERTYGET:
 310         *r = jsval_number(This->length);
 311         break;
 312     default:
 313         FIXME("unimplemented flags %x\n", flags);
 314         return E_NOTIMPL;
 315     }
 316
 317     return S_OK;
 318 }
 319
 320 static HRESULT Function_toString(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
 321         jsval_t *r)
 322 {
 323     FunctionInstance *function;
 324     jsstr_t *str;
 325     HRESULT hres;
 326
 327     TRACE("\n");
 328
 329     if(!(function = function_this(jsthis)))
 330         return throw_type_error(ctx, JS_E_FUNCTION_EXPECTED, NULL);
 331
 332     hres = function_to_string(function, &str);
 333     if(FAILED(hres))
 334         return hres;
 335
 336     if(r)
 337         *r = jsval_string(str);
 338     else
 339         jsstr_release(str);
 340     return S_OK;
 341 }
 342
 343 static HRESULT array_to_args(script_ctx_t *ctx, jsdisp_t *arg_array, unsigned *argc, jsval_t **ret)
 344 {
 345     jsval_t *argv, val;
 346     DWORD length, i;
 347     HRESULT hres;
 348
 349     hres = jsdisp_propget_name(arg_array, lengthW, &val);
 350     if(FAILED(hres))
 351         return hres;
 352
 353     hres = to_uint32(ctx, val, &length);
 354     jsval_release(val);
 355     if(FAILED(hres))
 356         return hres;
 357
 358     argv = heap_alloc(length * sizeof(*argv));
 359     if(!argv)
 360         return E_OUTOFMEMORY;
 361
 362     for(i=0; i<length; i++) {
 363         hres = jsdisp_get_idx(arg_array, i, argv+i);
 364         if(hres == DISP_E_UNKNOWNNAME) {
 365             argv[i] = jsval_undefined();
 366         }else if(FAILED(hres)) {
 367             while(i--)
 368                 jsval_release(argv[i]);
 369             heap_free(argv);
 370             return hres;
 371         }
 372     }
 373
 374     *argc = length;
 375     *ret = argv;
 376     return S_OK;
 377 }
 378
 379 static HRESULT Function_apply(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv, jsval_t *r)
 380 {
 381     FunctionInstance *function;
 382     jsval_t *args = NULL;
 383     unsigned i, cnt = 0;
 384     IDispatch *this_obj = NULL;
 385     HRESULT hres = S_OK;
 386
 387     TRACE("\n");
 388
 389     if(!(function = function_this(jsthis)))
 390         return throw_type_error(ctx, JS_E_FUNCTION_EXPECTED, NULL);
 391
 392     if(argc) {
 393         if(!is_undefined(argv[0]) && !is_null(argv[0])) {
 394             hres = to_object(ctx, argv[0], &this_obj);
 395             if(FAILED(hres))
 396                 return hres;
 397         }
 398     }
 399
 400     if(argc >= 2) {
 401         jsdisp_t *arg_array = NULL;
 402
 403         if(is_object_instance(argv[1])) {
 404             arg_array = iface_to_jsdisp((IUnknown*)get_object(argv[1]));
 405             if(arg_array &&
 406                (!is_class(arg_array, JSCLASS_ARRAY) && !is_class(arg_array, JSCLASS_ARGUMENTS) )) {
 407                 jsdisp_release(arg_array);
 408                 arg_array = NULL;
 409             }
 410         }
 411
 412         if(arg_array) {
 413             hres = array_to_args(ctx, arg_array, &cnt, &args);
 414             jsdisp_release(arg_array);
 415         }else {
 416             FIXME("throw TypeError\n");
 417             hres = E_FAIL;
 418         }
 419     }
 420
 421     if(SUCCEEDED(hres))
 422         hres = call_function(ctx, function, this_obj, cnt, args, r);
 423
 424     if(this_obj)
 425         IDispatch_Release(this_obj);
 426     for(i=0; i < cnt; i++)
 427         jsval_release(args[i]);
 428     heap_free(args);
 429     return hres;
 430 }
 431
 432 static HRESULT Function_call(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
 433         jsval_t *r)
 434 {
 435     FunctionInstance *function;
 436     IDispatch *this_obj = NULL;
 437     unsigned cnt = 0;
 438     HRESULT hres;
 439
 440     TRACE("\n");
 441
 442     if(!(function = function_this(jsthis)))
 443         return throw_type_error(ctx, JS_E_FUNCTION_EXPECTED, NULL);
 444
 445     if(argc) {
 446         if(!is_undefined(argv[0]) && !is_null(argv[0])) {
 447             hres = to_object(ctx, argv[0], &this_obj);
 448             if(FAILED(hres))
 449                 return hres;
 450         }
 451
 452         cnt = argc-1;
 453     }
 454
 455     hres = call_function(ctx, function, this_obj, cnt, argv+1, r);
 456
 457     if(this_obj)
 458         IDispatch_Release(this_obj);
 459     return hres;
 460 }
 461
 462 HRESULT Function_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
 463         jsval_t *r)
 464 {
 465     FunctionInstance *function;
 466
 467     TRACE("\n");
 468
 469     if(!is_vclass(jsthis, JSCLASS_FUNCTION)) {
 470         ERR("dispex is not a function\n");
 471         return E_FAIL;
 472     }
 473
 474     function = (FunctionInstance*)jsthis->u.jsdisp;
 475
 476     switch(flags) {
 477     case DISPATCH_METHOD:
 478         assert(function->value_proc != NULL);
 479         return invoke_value_proc(ctx, function, NULL, flags, argc, argv, r);
 480
 481     case DISPATCH_PROPERTYGET: {
 482         HRESULT hres;
 483         jsstr_t *str;
 484
 485         hres = function_to_string(function, &str);
 486         if(FAILED(hres))
 487             return hres;
 488
 489         *r = jsval_string(str);
 490         break;
 491     }
 492
 493     case DISPATCH_CONSTRUCT:
 494         assert(function->value_proc != NULL);
 495         return invoke_value_proc(ctx, function, NULL, flags, argc, argv, r);
 496
 497     default:
 498         FIXME("not implemented flags %x\n", flags);
 499         return E_NOTIMPL;
 500     }
 501
 502     return S_OK;
 503 }
 504
 505 static HRESULT Function_arguments(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags,
 506         unsigned argc, jsval_t *argv, jsval_t *r)
 507 {
 508     FunctionInstance *function = (FunctionInstance*)jsthis->u.jsdisp;
 509     HRESULT hres = S_OK;
 510
 511     TRACE("\n");
 512
 513     switch(flags) {
 514     case DISPATCH_PROPERTYGET: {
 515         *r = function->arguments ? jsval_obj(jsdisp_addref(function->arguments)) : jsval_null();
 516         break;
 517     }
 518     case DISPATCH_PROPERTYPUT:
 519         break;
 520     default:
 521         FIXME("unimplemented flags %x\n", flags);
 522         hres = E_NOTIMPL;
 523     }
 524
 525     return hres;
 526 }
 527
 528 static void Function_destructor(jsdisp_t *dispex)
 529 {
 530     FunctionInstance *This = (FunctionInstance*)dispex;
 531
 532     if(This->code)
 533         release_bytecode(This->code);
 534     if(This->scope_chain)
 535         scope_release(This->scope_chain);
 536     heap_free(This);
 537 }
 538
 539 static const builtin_prop_t Function_props[] = {
 540     {applyW,                 Function_apply,                 PROPF_METHOD|2},
 541     {argumentsW,             Function_arguments,             0},
 542     {callW,                  Function_call,                  PROPF_METHOD|1},
 543     {lengthW,                Function_length,                0},
 544     {toStringW,              Function_toString,              PROPF_METHOD}
 545 };
 546
 547 static const builtin_info_t Function_info = {
 548     JSCLASS_FUNCTION,
 549     {NULL, Function_value, 0},
 550     sizeof(Function_props)/sizeof(*Function_props),
 551     Function_props,
 552     Function_destructor,
 553     NULL
 554 };
 555
 556 static const builtin_prop_t FunctionInst_props[] = {
 557     {argumentsW,             Function_arguments,             0},
 558     {lengthW,                Function_length,                0}
 559 };
 560
 561 static const builtin_info_t FunctionInst_info = {
 562     JSCLASS_FUNCTION,
 563     {NULL, Function_value, 0},
 564     sizeof(FunctionInst_props)/sizeof(*FunctionInst_props),
 565     FunctionInst_props,
 566     Function_destructor,
 567     NULL
 568 };
 569
 570 static HRESULT create_function(script_ctx_t *ctx, const builtin_info_t *builtin_info, DWORD flags,
 571         BOOL funcprot, jsdisp_t *prototype, FunctionInstance **ret)
 572 {
 573     FunctionInstance *function;
 574     HRESULT hres;
 575
 576     function = heap_alloc_zero(sizeof(FunctionInstance));
 577     if(!function)
 578         return E_OUTOFMEMORY;
 579
 580     if(funcprot)
 581         hres = init_dispex(&function->dispex, ctx, builtin_info, prototype);
 582     else if(builtin_info)
 583         hres = init_dispex_from_constr(&function->dispex, ctx, builtin_info, ctx->function_constr);
 584     else
 585         hres = init_dispex_from_constr(&function->dispex, ctx, &FunctionInst_info, ctx->function_constr);
 586     if(FAILED(hres)) {
 587         heap_free(function);
 588         return hres;
 589     }
 590
 591     function->flags = flags;
 592     function->length = flags & PROPF_ARGMASK;
 593
 594     *ret = function;
 595     return S_OK;
 596 }
 597
 598 static inline HRESULT set_prototype(script_ctx_t *ctx, jsdisp_t *dispex, jsdisp_t *prototype)
 599 {
 600     return jsdisp_propput_dontenum(dispex, prototypeW, jsval_obj(prototype));
 601 }
 602
 603 HRESULT create_builtin_function(script_ctx_t *ctx, builtin_invoke_t value_proc, const WCHAR *name,
 604         const builtin_info_t *builtin_info, DWORD flags, jsdisp_t *prototype, jsdisp_t **ret)
 605 {
 606     FunctionInstance *function;
 607     HRESULT hres;
 608
 609     hres = create_function(ctx, builtin_info, flags, FALSE, NULL, &function);
 610     if(FAILED(hres))
 611         return hres;
 612
 613     if(builtin_info)
 614         hres = jsdisp_propput_const(&function->dispex, lengthW, jsval_number(function->length));
 615     if(SUCCEEDED(hres))
 616         hres = set_prototype(ctx, &function->dispex, prototype);
 617     if(FAILED(hres)) {
 618         jsdisp_release(&function->dispex);
 619         return hres;
 620     }
 621
 622     function->value_proc = value_proc;
 623     function->name = name;
 624
 625     *ret = &function->dispex;
 626     return S_OK;
 627 }
 628
 629 static HRESULT set_constructor_prop(script_ctx_t *ctx, jsdisp_t *constr, jsdisp_t *prot)
 630 {
 631     static const WCHAR constructorW[] = {'c','o','n','s','t','r','u','c','t','o','r',0};
 632
 633     return jsdisp_propput_dontenum(prot, constructorW, jsval_obj(constr));
 634 }
 635
 636 HRESULT create_builtin_constructor(script_ctx_t *ctx, builtin_invoke_t value_proc, const WCHAR *name,
 637         const builtin_info_t *builtin_info, DWORD flags, jsdisp_t *prototype, jsdisp_t **ret)
 638 {
 639     jsdisp_t *constr;
 640     HRESULT hres;
 641
 642     hres = create_builtin_function(ctx, value_proc, name, builtin_info, flags, prototype, &constr);
 643     if(FAILED(hres))
 644         return hres;
 645
 646     hres = set_constructor_prop(ctx, constr, prototype);
 647     if(FAILED(hres)) {
 648         jsdisp_release(constr);
 649         return hres;
 650     }
 651
 652     *ret = constr;
 653     return S_OK;
 654 }
 655
 656 HRESULT create_source_function(script_ctx_t *ctx, bytecode_t *code, function_code_t *func_code,
 657         scope_chain_t *scope_chain, jsdisp_t **ret)
 658 {
 659     FunctionInstance *function;
 660     jsdisp_t *prototype;
 661     HRESULT hres;
 662
 663     hres = create_object(ctx, NULL, &prototype);
 664     if(FAILED(hres))
 665         return hres;
 666
 667     hres = create_function(ctx, NULL, PROPF_CONSTR, FALSE, NULL, &function);
 668     if(SUCCEEDED(hres)) {
 669         hres = set_prototype(ctx, &function->dispex, prototype);
 670         if(SUCCEEDED(hres))
 671             hres = set_constructor_prop(ctx, &function->dispex, prototype);
 672         if(FAILED(hres))
 673             jsdisp_release(&function->dispex);
 674     }
 675     jsdisp_release(prototype);
 676     if(FAILED(hres))
 677         return hres;
 678
 679     if(scope_chain) {
 680         scope_addref(scope_chain);
 681         function->scope_chain = scope_chain;
 682     }
 683
 684     bytecode_addref(code);
 685     function->code = code;
 686     function->func_code = func_code;
 687     function->length = function->func_code->param_cnt;
 688
 689     *ret = &function->dispex;
 690     return S_OK;
 691 }
 692
 693 static HRESULT construct_function(script_ctx_t *ctx, unsigned argc, jsval_t *argv, IDispatch **ret)
 694 {
 695     WCHAR *str = NULL, *ptr;
 696     DWORD len = 0, l;
 697     bytecode_t *code;
 698     jsdisp_t *function;
 699     jsstr_t **params = NULL;
 700     int i=0, j=0;
 701     HRESULT hres = S_OK;
 702
 703     static const WCHAR function_anonymousW[] = {'f','u','n','c','t','i','o','n',' ','a','n','o','n','y','m','o','u','s','('};
 704     static const WCHAR function_beginW[] = {')',' ','{','\n'};
 705     static const WCHAR function_endW[] = {'\n','}',0};
 706
 707     if(argc) {
 708         params = heap_alloc(argc*sizeof(*params));
 709         if(!params)
 710             return E_OUTOFMEMORY;
 711
 712         if(argc > 2)
 713             len = (argc-2)*2; /* separating commas */
 714         for(i=0; i < argc; i++) {
 715             hres = to_string(ctx, argv[i], params+i);
 716             if(FAILED(hres))
 717                 break;
 718             len += jsstr_length(params[i]);
 719         }
 720     }
 721
 722     if(SUCCEEDED(hres)) {
 723         len += (sizeof(function_anonymousW) + sizeof(function_beginW) + sizeof(function_endW)) / sizeof(WCHAR);
 724         str = heap_alloc(len*sizeof(WCHAR));
 725         if(str) {
 726             memcpy(str, function_anonymousW, sizeof(function_anonymousW));
 727             ptr = str + sizeof(function_anonymousW)/sizeof(WCHAR);
 728             if(argc > 1) {
 729                 while(1) {
 730                     l = jsstr_length(params[j]);
 731                     memcpy(ptr, params[j]->str, l*sizeof(WCHAR));
 732                     ptr += l;
 733                     if(++j == argc-1)
 734                         break;
 735                     *ptr++ = ',';
 736                     *ptr++ = ' ';
 737                 }
 738             }
 739             memcpy(ptr, function_beginW, sizeof(function_beginW));
 740             ptr += sizeof(function_beginW)/sizeof(WCHAR);
 741             if(argc) {
 742                 l = jsstr_length(params[argc-1]);
 743                 memcpy(ptr, params[argc-1]->str, l*sizeof(WCHAR));
 744                 ptr += l;
 745             }
 746             memcpy(ptr, function_endW, sizeof(function_endW));
 747
 748             TRACE("%s\n", debugstr_w(str));
 749         }else {
 750             hres = E_OUTOFMEMORY;
 751         }
 752     }
 753
 754     while(--i >= 0)
 755         jsstr_release(params[i]);
 756     heap_free(params);
 757     if(FAILED(hres))
 758         return hres;
 759
 760     hres = compile_script(ctx, str, NULL, NULL, FALSE, FALSE, &code);
 761     heap_free(str);
 762     if(FAILED(hres))
 763         return hres;
 764
 765     if(code->global_code.func_cnt != 1 || code->global_code.var_cnt) {
 766         ERR("Invalid parser result!\n");
 767         release_bytecode(code);
 768         return E_UNEXPECTED;
 769     }
 770
 771     hres = create_source_function(ctx, code, code->global_code.funcs, NULL, &function);
 772     release_bytecode(code);
 773     if(FAILED(hres))
 774         return hres;
 775
 776     *ret = to_disp(function);
 777     return S_OK;
 778 }
 779
 780 static HRESULT FunctionConstr_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
 781         jsval_t *r)
 782 {
 783     HRESULT hres;
 784
 785     TRACE("\n");
 786
 787     switch(flags) {
 788     case DISPATCH_CONSTRUCT: {
 789         IDispatch *ret;
 790
 791         hres = construct_function(ctx, argc, argv, &ret);
 792         if(FAILED(hres))
 793             return hres;
 794
 795         *r = jsval_disp(ret);
 796         break;
 797     }
 798     default:
 799         FIXME("unimplemented flags %x\n", flags);
 800         return E_NOTIMPL;
 801     }
 802
 803     return S_OK;
 804 }
 805
 806 static HRESULT FunctionProt_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
 807         jsval_t *r)
 808 {
 809     FIXME("\n");
 810     return E_NOTIMPL;
 811 }
 812
 813 HRESULT init_function_constr(script_ctx_t *ctx, jsdisp_t *object_prototype)
 814 {
 815     FunctionInstance *prot, *constr;
 816     HRESULT hres;
 817
 818     static const WCHAR FunctionW[] = {'F','u','n','c','t','i','o','n',0};
 819
 820     hres = create_function(ctx, &Function_info, PROPF_CONSTR, TRUE, object_prototype, &prot);
 821     if(FAILED(hres))
 822         return hres;
 823
 824     prot->value_proc = FunctionProt_value;
 825     prot->name = prototypeW;
 826
 827     hres = create_function(ctx, &FunctionInst_info, PROPF_CONSTR|1, TRUE, &prot->dispex, &constr);
 828     if(SUCCEEDED(hres)) {
 829         constr->value_proc = FunctionConstr_value;
 830         constr->name = FunctionW;
 831         hres = set_prototype(ctx, &constr->dispex, &prot->dispex);
 832         if(SUCCEEDED(hres))
 833             hres = set_constructor_prop(ctx, &constr->dispex, &prot->dispex);
 834         if(FAILED(hres))
 835             jsdisp_release(&constr->dispex);
 836     }
 837     jsdisp_release(&prot->dispex);
 838     if(FAILED(hres))
 839         return hres;
 840
 841     ctx->function_constr = &constr->dispex;
 842     return S_OK;
 843 }