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