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 "jscript.h"
  20 #include "engine.h"
  21
  22 #include "wine/debug.h"
  23
  24 WINE_DEFAULT_DEBUG_CHANNEL(jscript);
  25
  26 typedef struct {
  27     DispatchEx dispex;
  28     builtin_invoke_t value_proc;
  29     const WCHAR *name;
  30     DWORD flags;
  31     source_elements_t *source;
  32     parameter_t *parameters;
  33     scope_chain_t *scope_chain;
  34     parser_ctx_t *parser;
  35     const WCHAR *src_str;
  36     DWORD src_len;
  37     DWORD length;
  38 } FunctionInstance;
  39
  40 static const WCHAR prototypeW[] = {'p','r','o','t','o','t', 'y', 'p','e',0};
  41
  42 static const WCHAR lengthW[] = {'l','e','n','g','t','h',0};
  43 static const WCHAR toStringW[] = {'t','o','S','t','r','i','n','g',0};
  44 static const WCHAR applyW[] = {'a','p','p','l','y',0};
  45 static const WCHAR callW[] = {'c','a','l','l',0};
  46
  47 static IDispatch *get_this(DISPPARAMS *dp)
  48 {
  49     DWORD i;
  50
  51     for(i=0; i < dp->cNamedArgs; i++) {
  52         if(dp->rgdispidNamedArgs[i] == DISPID_THIS) {
  53             if(V_VT(dp->rgvarg+i) == VT_DISPATCH)
  54                 return V_DISPATCH(dp->rgvarg+i);
  55
  56             WARN("This is not VT_DISPATCH\n");
  57             return NULL;
  58         }
  59     }
  60
  61     TRACE("no this passed\n");
  62     return NULL;
  63 }
  64
  65 static HRESULT init_parameters(DispatchEx *var_disp, FunctionInstance *function, LCID lcid, DISPPARAMS *dp,
  66         jsexcept_t *ei, IServiceProvider *caller)
  67 {
  68     parameter_t *param;
  69     VARIANT var_empty;
  70     DWORD cargs, i=0;
  71     HRESULT hres;
  72
  73     V_VT(&var_empty) = VT_EMPTY;
  74     cargs = arg_cnt(dp);
  75
  76     for(param = function->parameters; param; param = param->next) {
  77         hres = jsdisp_propput_name(var_disp, param->identifier, lcid,
  78                 i < cargs ? get_arg(dp,i) : &var_empty, ei, caller);
  79         if(FAILED(hres))
  80             return hres;
  81
  82         i++;
  83     }
  84
  85     return S_OK;
  86 }
  87
  88 static HRESULT Arguments_value(DispatchEx *dispex, LCID lcid, WORD flags, DISPPARAMS *dp,
  89         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
  90 {
  91     FIXME("\n");
  92     return E_NOTIMPL;
  93 }
  94
  95 static const builtin_info_t Arguments_info = {
  96     JSCLASS_ARGUMENTS,
  97     {NULL, Arguments_value, 0},
  98     0, NULL,
  99     NULL,
 100     NULL
 101 };
 102
 103 static HRESULT create_arguments(script_ctx_t *ctx, IDispatch *calee, LCID lcid, DISPPARAMS *dp,
 104         jsexcept_t *ei, IServiceProvider *caller, DispatchEx **ret)
 105 {
 106     DispatchEx *args;
 107     VARIANT var;
 108     DWORD i;
 109     HRESULT hres;
 110
 111     static const WCHAR caleeW[] = {'c','a','l','l','e','e',0};
 112
 113     args = heap_alloc_zero(sizeof(DispatchEx));
 114     if(!args)
 115         return E_OUTOFMEMORY;
 116
 117     hres = init_dispex_from_constr(args, ctx, &Arguments_info, ctx->object_constr);
 118     if(FAILED(hres)) {
 119         heap_free(args);
 120         return hres;
 121     }
 122
 123     for(i=0; i < arg_cnt(dp); i++) {
 124         hres = jsdisp_propput_idx(args, i, lcid, get_arg(dp,i), ei, caller);
 125         if(FAILED(hres))
 126             break;
 127     }
 128
 129     if(SUCCEEDED(hres)) {
 130         V_VT(&var) = VT_I4;
 131         V_I4(&var) = arg_cnt(dp);
 132         hres = jsdisp_propput_name(args, lengthW, lcid, &var, ei, caller);
 133
 134         if(SUCCEEDED(hres)) {
 135             V_VT(&var) = VT_DISPATCH;
 136             V_DISPATCH(&var) = calee;
 137             hres = jsdisp_propput_name(args, caleeW, lcid, &var, ei, caller);
 138         }
 139     }
 140
 141     if(FAILED(hres)) {
 142         jsdisp_release(args);
 143         return hres;
 144     }
 145
 146     *ret = args;
 147     return S_OK;
 148 }
 149
 150 static HRESULT create_var_disp(FunctionInstance *function, LCID lcid, DISPPARAMS *dp, jsexcept_t *ei,
 151                                IServiceProvider *caller, DispatchEx **ret)
 152 {
 153     DispatchEx *var_disp, *arg_disp;
 154     HRESULT hres;
 155
 156     static const WCHAR argumentsW[] = {'a','r','g','u','m','e','n','t','s',0};
 157
 158     hres = create_dispex(function->dispex.ctx, NULL, NULL, &var_disp);
 159     if(FAILED(hres))
 160         return hres;
 161
 162     hres = create_arguments(function->dispex.ctx, (IDispatch*)_IDispatchEx_(&function->dispex),
 163             lcid, dp, ei, caller, &arg_disp);
 164     if(SUCCEEDED(hres)) {
 165         VARIANT var;
 166
 167         V_VT(&var) = VT_DISPATCH;
 168         V_DISPATCH(&var) = (IDispatch*)_IDispatchEx_(arg_disp);
 169         hres = jsdisp_propput_name(var_disp, argumentsW, lcid, &var, ei, caller);
 170         jsdisp_release(arg_disp);
 171     }
 172
 173     if(SUCCEEDED(hres))
 174         hres = init_parameters(var_disp, function, lcid, dp, ei, caller);
 175     if(FAILED(hres)) {
 176         jsdisp_release(var_disp);
 177         return hres;
 178     }
 179
 180     *ret = var_disp;
 181     return S_OK;
 182 }
 183
 184 static HRESULT invoke_source(FunctionInstance *function, IDispatch *this_obj, LCID lcid, DISPPARAMS *dp,
 185         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 186 {
 187     DispatchEx *var_disp;
 188     exec_ctx_t *exec_ctx;
 189     scope_chain_t *scope;
 190     HRESULT hres;
 191
 192     if(!function->source) {
 193         FIXME("no source\n");
 194         return E_FAIL;
 195     }
 196
 197     hres = create_var_disp(function, lcid, dp, ei, caller, &var_disp);
 198     if(FAILED(hres))
 199         return hres;
 200
 201     hres = scope_push(function->scope_chain, var_disp, &scope);
 202     if(SUCCEEDED(hres)) {
 203         hres = create_exec_ctx(this_obj, var_disp, scope, &exec_ctx);
 204         scope_release(scope);
 205     }
 206     if(FAILED(hres))
 207         return hres;
 208
 209     hres = exec_source(exec_ctx, function->parser, function->source, ei, retv);
 210     exec_release(exec_ctx);
 211
 212     return hres;
 213 }
 214
 215 static HRESULT invoke_function(FunctionInstance *function, LCID lcid, DISPPARAMS *dp,
 216         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 217 {
 218     IDispatch *this_obj;
 219
 220     if(!(this_obj = get_this(dp)))
 221         this_obj = (IDispatch*)_IDispatchEx_(function->dispex.ctx->script_disp);
 222
 223     return invoke_source(function, this_obj, lcid, dp, retv, ei, caller);
 224 }
 225
 226 static HRESULT invoke_constructor(FunctionInstance *function, LCID lcid, DISPPARAMS *dp,
 227         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 228 {
 229     DispatchEx *this_obj;
 230     HRESULT hres;
 231
 232     hres = create_object(function->dispex.ctx, &function->dispex, &this_obj);
 233     if(FAILED(hres))
 234         return hres;
 235
 236     hres = invoke_source(function, (IDispatch*)_IDispatchEx_(this_obj), lcid, dp, retv, ei, caller);
 237     if(FAILED(hres)) {
 238         jsdisp_release(this_obj);
 239         return hres;
 240     }
 241
 242     V_VT(retv) = VT_DISPATCH;
 243     V_DISPATCH(retv) = (IDispatch*)_IDispatchEx_(this_obj);
 244     return S_OK;
 245 }
 246
 247 static HRESULT invoke_value_proc(FunctionInstance *function, LCID lcid, WORD flags, DISPPARAMS *dp,
 248         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 249 {
 250     DispatchEx *this_obj = NULL;
 251     IDispatch *this_disp;
 252     HRESULT hres;
 253
 254     this_disp = get_this(dp);
 255     if(this_disp)
 256         this_obj = iface_to_jsdisp((IUnknown*)this_disp);
 257
 258     hres = function->value_proc(this_obj ? this_obj : function->dispex.ctx->script_disp, lcid,
 259                                 flags, dp, retv, ei, caller);
 260
 261     if(this_obj)
 262         jsdisp_release(this_obj);
 263     return hres;
 264 }
 265
 266 static HRESULT call_function(FunctionInstance *function, IDispatch *this_obj, LCID lcid, DISPPARAMS *args,
 267         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 268 {
 269     HRESULT hres;
 270
 271     if(function->value_proc) {
 272         DispatchEx *jsthis = NULL;
 273
 274         if(this_obj) {
 275             jsthis = iface_to_jsdisp((IUnknown*)this_obj);
 276             if(!jsthis)
 277                 FIXME("this_obj is not DispatchEx\n");
 278         }
 279
 280         hres = function->value_proc(jsthis ? jsthis : function->dispex.ctx->script_disp, lcid,
 281                 DISPATCH_METHOD, args, retv, ei, caller);
 282
 283         if(jsthis)
 284             jsdisp_release(jsthis);
 285     }else {
 286         hres = invoke_source(function,
 287                 this_obj ? this_obj : (IDispatch*)_IDispatchEx_(function->dispex.ctx->script_disp),
 288                 lcid, args, retv, ei, caller);
 289     }
 290
 291     return hres;
 292 }
 293
 294 static HRESULT function_to_string(FunctionInstance *function, BSTR *ret)
 295 {
 296     BSTR str;
 297
 298     static const WCHAR native_prefixW[] = {'\n','f','u','n','c','t','i','o','n',' '};
 299     static const WCHAR native_suffixW[] =
 300         {'(',')',' ','{','\n',' ',' ',' ',' ','[','n','a','t','i','v','e',' ','c','o','d','e',']','\n','}','\n'};
 301
 302     if(function->value_proc) {
 303         DWORD name_len;
 304
 305         name_len = strlenW(function->name);
 306         str = SysAllocStringLen(NULL, sizeof(native_prefixW) + name_len*sizeof(WCHAR) + sizeof(native_suffixW));
 307         if(!str)
 308             return E_OUTOFMEMORY;
 309
 310         memcpy(str, native_prefixW, sizeof(native_prefixW));
 311         memcpy(str + sizeof(native_prefixW)/sizeof(WCHAR), function->name, name_len*sizeof(WCHAR));
 312         memcpy(str + sizeof(native_prefixW)/sizeof(WCHAR) + name_len, native_suffixW, sizeof(native_suffixW));
 313     }else {
 314         str = SysAllocStringLen(function->src_str, function->src_len);
 315         if(!str)
 316             return E_OUTOFMEMORY;
 317     }
 318
 319     *ret = str;
 320     return S_OK;
 321 }
 322
 323 static HRESULT Function_length(DispatchEx *dispex, LCID lcid, WORD flags, DISPPARAMS *dp,
 324         VARIANT *retv, jsexcept_t *ei, IServiceProvider *sp)
 325 {
 326     FunctionInstance *This = (FunctionInstance*)dispex;
 327
 328     TRACE("%p %d\n", This, This->length);
 329
 330     switch(flags) {
 331     case DISPATCH_PROPERTYGET:
 332         V_VT(retv) = VT_I4;
 333         V_I4(retv) = This->length;
 334         break;
 335     default:
 336         FIXME("unimplemented flags %x\n", flags);
 337         return E_NOTIMPL;
 338     }
 339
 340     return S_OK;
 341 }
 342
 343 static HRESULT Function_toString(DispatchEx *dispex, LCID lcid, WORD flags, DISPPARAMS *dp,
 344         VARIANT *retv, jsexcept_t *ei, IServiceProvider *sp)
 345 {
 346     FunctionInstance *function;
 347     BSTR str;
 348     HRESULT hres;
 349
 350     TRACE("\n");
 351
 352     if(!is_class(dispex, JSCLASS_FUNCTION))
 353         return throw_type_error(dispex->ctx, ei, IDS_NOT_FUNC, NULL);
 354
 355     function = (FunctionInstance*)dispex;
 356
 357     hres = function_to_string(function, &str);
 358     if(FAILED(hres))
 359         return hres;
 360
 361     if(retv) {
 362         V_VT(retv) = VT_BSTR;
 363         V_BSTR(retv) = str;
 364     }else {
 365         SysFreeString(str);
 366     }
 367     return S_OK;
 368 }
 369
 370 static HRESULT array_to_args(DispatchEx *arg_array, LCID lcid, jsexcept_t *ei, IServiceProvider *caller,
 371         DISPPARAMS *args)
 372 {
 373     VARIANT var, *argv;
 374     DWORD length, i;
 375     HRESULT hres;
 376
 377     hres = jsdisp_propget_name(arg_array, lengthW, lcid, &var, ei, NULL/*FIXME*/);
 378     if(FAILED(hres))
 379         return hres;
 380
 381     hres = to_uint32(arg_array->ctx, &var, ei, &length);
 382     VariantClear(&var);
 383     if(FAILED(hres))
 384         return hres;
 385
 386     argv = heap_alloc(length * sizeof(VARIANT));
 387     if(!argv)
 388         return E_OUTOFMEMORY;
 389
 390     for(i=0; i<length; i++) {
 391         hres = jsdisp_propget_idx(arg_array, i, lcid, argv+i, ei, caller);
 392         if(FAILED(hres)) {
 393             while(i--)
 394                 VariantClear(argv+i);
 395             heap_free(argv);
 396             return hres;
 397         }
 398     }
 399
 400     args->cArgs = length;
 401     args->rgvarg = argv;
 402     return S_OK;
 403 }
 404
 405 static HRESULT Function_apply(DispatchEx *dispex, LCID lcid, WORD flags, DISPPARAMS *dp,
 406         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 407 {
 408     FunctionInstance *function;
 409     DISPPARAMS args = {NULL,NULL,0,0};
 410     DWORD argc, i;
 411     IDispatch *this_obj = NULL;
 412     HRESULT hres = S_OK;
 413
 414     TRACE("\n");
 415
 416     if(!is_class(dispex, JSCLASS_FUNCTION)) {
 417         FIXME("dispex is not a function\n");
 418         return E_FAIL;
 419     }
 420
 421     function = (FunctionInstance*)dispex;
 422     argc = arg_cnt(dp);
 423
 424     if(argc) {
 425         hres = to_object(dispex->ctx, get_arg(dp,0), &this_obj);
 426         if(FAILED(hres))
 427             return hres;
 428     }
 429
 430     if(argc >= 2) {
 431         DispatchEx *arg_array = NULL;
 432
 433         if(V_VT(get_arg(dp,1)) == VT_DISPATCH) {
 434             arg_array = iface_to_jsdisp((IUnknown*)V_DISPATCH(get_arg(dp,1)));
 435             if(arg_array && (
 436                 !is_class(arg_array, JSCLASS_ARRAY) && !is_class(arg_array, JSCLASS_ARGUMENTS) )) {
 437                 jsdisp_release(arg_array);
 438                 arg_array = NULL;
 439             }
 440         }
 441
 442         if(arg_array) {
 443             hres = array_to_args(arg_array, lcid, ei, caller, &args);
 444             jsdisp_release(arg_array);
 445         }else {
 446             FIXME("throw TypeError\n");
 447             hres = E_FAIL;
 448         }
 449     }
 450
 451     hres = call_function(function, this_obj, lcid, &args, retv, ei, caller);
 452
 453     if(this_obj)
 454         IDispatch_Release(this_obj);
 455     for(i=0; i<args.cArgs; i++)
 456         VariantClear(args.rgvarg+i);
 457     heap_free(args.rgvarg);
 458     return hres;
 459 }
 460
 461 static HRESULT Function_call(DispatchEx *dispex, LCID lcid, WORD flags, DISPPARAMS *dp,
 462         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 463 {
 464     FunctionInstance *function;
 465     DISPPARAMS args = {NULL,NULL,0,0};
 466     IDispatch *this_obj = NULL;
 467     DWORD argc;
 468     HRESULT hres;
 469
 470     TRACE("\n");
 471
 472     if(!is_class(dispex, JSCLASS_FUNCTION)) {
 473         FIXME("dispex is not a function\n");
 474         return E_FAIL;
 475     }
 476
 477     function = (FunctionInstance*)dispex;
 478     argc = arg_cnt(dp);
 479
 480     if(argc) {
 481         hres = to_object(dispex->ctx, get_arg(dp,0), &this_obj);
 482         if(FAILED(hres))
 483             return hres;
 484         args.cArgs = argc-1;
 485     }
 486
 487     if(args.cArgs)
 488         args.rgvarg = dp->rgvarg + dp->cArgs - args.cArgs-1;
 489
 490     hres = call_function(function, this_obj, lcid, &args, retv, ei, caller);
 491
 492     if(this_obj)
 493         IDispatch_Release(this_obj);
 494     return hres;
 495 }
 496
 497 HRESULT Function_value(DispatchEx *dispex, LCID lcid, WORD flags, DISPPARAMS *dp,
 498         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 499 {
 500     FunctionInstance *function;
 501
 502     TRACE("\n");
 503
 504     if(dispex->builtin_info->class != JSCLASS_FUNCTION) {
 505         ERR("dispex is not a function\n");
 506         return E_FAIL;
 507     }
 508
 509     function = (FunctionInstance*)dispex;
 510
 511     switch(flags) {
 512     case DISPATCH_METHOD:
 513         if(function->value_proc)
 514             return invoke_value_proc(function, lcid, flags, dp, retv, ei, caller);
 515
 516         return invoke_function(function, lcid, dp, retv, ei, caller);
 517
 518     case DISPATCH_PROPERTYGET: {
 519         HRESULT hres;
 520         BSTR str;
 521
 522         hres = function_to_string(function, &str);
 523         if(FAILED(hres))
 524             return hres;
 525
 526         V_VT(retv) = VT_BSTR;
 527         V_BSTR(retv) = str;
 528         break;
 529     }
 530
 531     case DISPATCH_CONSTRUCT:
 532         if(function->value_proc)
 533             return invoke_value_proc(function, lcid, flags, dp, retv, ei, caller);
 534
 535         return invoke_constructor(function, lcid, dp, retv, ei, caller);
 536
 537     default:
 538         FIXME("not implemented flags %x\n", flags);
 539         return E_NOTIMPL;
 540     }
 541
 542     return S_OK;
 543 }
 544
 545 static void Function_destructor(DispatchEx *dispex)
 546 {
 547     FunctionInstance *This = (FunctionInstance*)dispex;
 548
 549     if(This->parser)
 550         parser_release(This->parser);
 551     if(This->scope_chain)
 552         scope_release(This->scope_chain);
 553     heap_free(This);
 554 }
 555
 556 static const builtin_prop_t Function_props[] = {
 557     {applyW,                 Function_apply,                 PROPF_METHOD|2},
 558     {callW,                  Function_call,                  PROPF_METHOD|1},
 559     {lengthW,                Function_length,                0},
 560     {toStringW,              Function_toString,              PROPF_METHOD}
 561 };
 562
 563 static const builtin_info_t Function_info = {
 564     JSCLASS_FUNCTION,
 565     {NULL, Function_value, 0},
 566     sizeof(Function_props)/sizeof(*Function_props),
 567     Function_props,
 568     Function_destructor,
 569     NULL
 570 };
 571
 572 static HRESULT FunctionConstr_value(DispatchEx *dispex, LCID lcid, WORD flags, DISPPARAMS *dp,
 573         VARIANT *retv, jsexcept_t *ei, IServiceProvider *sp)
 574 {
 575     FIXME("\n");
 576     return E_NOTIMPL;
 577 }
 578
 579 static HRESULT FunctionProt_value(DispatchEx *dispex, LCID lcid, WORD flags, DISPPARAMS *dp,
 580         VARIANT *retv, jsexcept_t *ei, IServiceProvider *sp)
 581 {
 582     FIXME("\n");
 583     return E_NOTIMPL;
 584 }
 585
 586 static HRESULT create_function(script_ctx_t *ctx, const builtin_info_t *builtin_info, DWORD flags,
 587         BOOL funcprot, DispatchEx *prototype, FunctionInstance **ret)
 588 {
 589     FunctionInstance *function;
 590     HRESULT hres;
 591
 592     function = heap_alloc_zero(sizeof(FunctionInstance));
 593     if(!function)
 594         return E_OUTOFMEMORY;
 595
 596     if(funcprot)
 597         hres = init_dispex(&function->dispex, ctx, &Function_info, prototype);
 598     else if(builtin_info)
 599         hres = init_dispex_from_constr(&function->dispex, ctx, builtin_info, ctx->function_constr);
 600     else
 601         hres = init_dispex_from_constr(&function->dispex, ctx, &Function_info, ctx->function_constr);
 602     if(FAILED(hres))
 603         return hres;
 604
 605     function->flags = flags;
 606     function->length = flags & PROPF_ARGMASK;
 607
 608     *ret = function;
 609     return S_OK;
 610 }
 611
 612 static HRESULT set_prototype(script_ctx_t *ctx, DispatchEx *dispex, DispatchEx *prototype)
 613 {
 614     jsexcept_t jsexcept;
 615     VARIANT var;
 616
 617     V_VT(&var) = VT_DISPATCH;
 618     V_DISPATCH(&var) = (IDispatch*)_IDispatchEx_(prototype);
 619     memset(&jsexcept, 0, sizeof(jsexcept));
 620
 621     return jsdisp_propput_name(dispex, prototypeW, ctx->lcid, &var, &jsexcept, NULL/*FIXME*/);
 622 }
 623
 624 HRESULT create_builtin_function(script_ctx_t *ctx, builtin_invoke_t value_proc, const WCHAR *name,
 625         const builtin_info_t *builtin_info, DWORD flags, DispatchEx *prototype, DispatchEx **ret)
 626 {
 627     FunctionInstance *function;
 628     HRESULT hres;
 629
 630     hres = create_function(ctx, builtin_info, flags, FALSE, NULL, &function);
 631     if(FAILED(hres))
 632         return hres;
 633
 634     hres = set_prototype(ctx, &function->dispex, prototype);
 635     if(FAILED(hres)) {
 636         jsdisp_release(&function->dispex);
 637         return hres;
 638     }
 639
 640     function->value_proc = value_proc;
 641     function->name = name;
 642
 643     *ret = &function->dispex;
 644     return S_OK;
 645 }
 646
 647 HRESULT create_source_function(parser_ctx_t *ctx, parameter_t *parameters, source_elements_t *source,
 648         scope_chain_t *scope_chain, const WCHAR *src_str, DWORD src_len, DispatchEx **ret)
 649 {
 650     FunctionInstance *function;
 651     DispatchEx *prototype;
 652     parameter_t *iter;
 653     DWORD length = 0;
 654     HRESULT hres;
 655
 656     hres = create_object(ctx->script, NULL, &prototype);
 657     if(FAILED(hres))
 658         return hres;
 659
 660     hres = create_function(ctx->script, NULL, PROPF_CONSTR, FALSE, NULL, &function);
 661     if(SUCCEEDED(hres)) {
 662         hres = set_prototype(ctx->script, &function->dispex, prototype);
 663         if(FAILED(hres))
 664             jsdisp_release(&function->dispex);
 665     }
 666     jsdisp_release(prototype);
 667     if(FAILED(hres))
 668         return hres;
 669
 670     function->source = source;
 671     function->parameters = parameters;
 672
 673     if(scope_chain) {
 674         scope_addref(scope_chain);
 675         function->scope_chain = scope_chain;
 676     }
 677
 678     parser_addref(ctx);
 679     function->parser = ctx;
 680
 681     for(iter = parameters; iter; iter = iter->next)
 682         length++;
 683     function->length = length;
 684
 685     function->src_str = src_str;
 686     function->src_len = src_len;
 687
 688     *ret = &function->dispex;
 689     return S_OK;
 690 }
 691
 692 HRESULT init_function_constr(script_ctx_t *ctx, DispatchEx *object_prototype)
 693 {
 694     FunctionInstance *prot, *constr;
 695     HRESULT hres;
 696
 697     static const WCHAR FunctionW[] = {'F','u','n','c','t','i','o','n',0};
 698
 699     hres = create_function(ctx, NULL, PROPF_CONSTR, TRUE, object_prototype, &prot);
 700     if(FAILED(hres))
 701         return hres;
 702
 703     prot->value_proc = FunctionProt_value;
 704     prot->name = prototypeW;
 705
 706     hres = create_function(ctx, NULL, PROPF_CONSTR, TRUE, &prot->dispex, &constr);
 707     if(SUCCEEDED(hres)) {
 708         constr->value_proc = FunctionConstr_value;
 709         constr->name = FunctionW;
 710         hres = set_prototype(ctx, &constr->dispex, &prot->dispex);
 711         if(FAILED(hres))
 712             jsdisp_release(&constr->dispex);
 713     }
 714     jsdisp_release(&prot->dispex);
 715     if(FAILED(hres))
 716         return hres;
 717
 718     ctx->function_constr = &constr->dispex;
 719     return S_OK;
 720 }