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, 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     HRESULT hres;
 230
 231     hres = create_object(ctx, &function->dispex, &this_obj);
 232     if(FAILED(hres))
 233         return hres;
 234
 235     hres = invoke_source(ctx, function, (IDispatch*)_IDispatchEx_(this_obj), dp, retv, ei, caller);
 236     if(FAILED(hres)) {
 237         jsdisp_release(this_obj);
 238         return hres;
 239     }
 240
 241     V_VT(retv) = VT_DISPATCH;
 242     V_DISPATCH(retv) = (IDispatch*)_IDispatchEx_(this_obj);
 243     return S_OK;
 244 }
 245
 246 static HRESULT invoke_value_proc(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_disp, WORD flags, DISPPARAMS *dp,
 247         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 248 {
 249     vdisp_t vthis;
 250     HRESULT hres;
 251
 252     if(this_disp)
 253         set_disp(&vthis, this_disp);
 254     else if(ctx->host_global)
 255         set_disp(&vthis, ctx->host_global);
 256     else
 257         set_jsdisp(&vthis, ctx->global);
 258
 259     hres = function->value_proc(ctx, &vthis, flags, dp, retv, ei, caller);
 260
 261     vdisp_release(&vthis);
 262     return hres;
 263 }
 264
 265 static HRESULT call_function(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_obj, DISPPARAMS *args,
 266         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 267 {
 268     if(function->value_proc)
 269         return invoke_value_proc(ctx, function, this_obj, DISPATCH_METHOD, args, retv, ei, caller);
 270
 271     return invoke_source(ctx, function, this_obj, args, retv, ei, caller);
 272 }
 273
 274 static HRESULT function_to_string(FunctionInstance *function, BSTR *ret)
 275 {
 276     BSTR str;
 277
 278     static const WCHAR native_prefixW[] = {'\n','f','u','n','c','t','i','o','n',' '};
 279     static const WCHAR native_suffixW[] =
 280         {'(',')',' ','{','\n',' ',' ',' ',' ','[','n','a','t','i','v','e',' ','c','o','d','e',']','\n','}','\n'};
 281
 282     if(function->value_proc) {
 283         DWORD name_len;
 284
 285         name_len = strlenW(function->name);
 286         str = SysAllocStringLen(NULL, sizeof(native_prefixW) + name_len*sizeof(WCHAR) + sizeof(native_suffixW));
 287         if(!str)
 288             return E_OUTOFMEMORY;
 289
 290         memcpy(str, native_prefixW, sizeof(native_prefixW));
 291         memcpy(str + sizeof(native_prefixW)/sizeof(WCHAR), function->name, name_len*sizeof(WCHAR));
 292         memcpy(str + sizeof(native_prefixW)/sizeof(WCHAR) + name_len, native_suffixW, sizeof(native_suffixW));
 293     }else {
 294         str = SysAllocStringLen(function->src_str, function->src_len);
 295         if(!str)
 296             return E_OUTOFMEMORY;
 297     }
 298
 299     *ret = str;
 300     return S_OK;
 301 }
 302
 303 static HRESULT Function_length(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 304         VARIANT *retv, jsexcept_t *ei, IServiceProvider *sp)
 305 {
 306     FunctionInstance *This = function_from_vdisp(jsthis);
 307
 308     TRACE("%p %d\n", This, This->length);
 309
 310     switch(flags) {
 311     case DISPATCH_PROPERTYGET:
 312         V_VT(retv) = VT_I4;
 313         V_I4(retv) = This->length;
 314         break;
 315     default:
 316         FIXME("unimplemented flags %x\n", flags);
 317         return E_NOTIMPL;
 318     }
 319
 320     return S_OK;
 321 }
 322
 323 static HRESULT Function_toString(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 324         VARIANT *retv, jsexcept_t *ei, IServiceProvider *sp)
 325 {
 326     FunctionInstance *function;
 327     BSTR str;
 328     HRESULT hres;
 329
 330     TRACE("\n");
 331
 332     if(!(function = function_this(jsthis)))
 333         return throw_type_error(ctx, ei, IDS_NOT_FUNC, NULL);
 334
 335     hres = function_to_string(function, &str);
 336     if(FAILED(hres))
 337         return hres;
 338
 339     if(retv) {
 340         V_VT(retv) = VT_BSTR;
 341         V_BSTR(retv) = str;
 342     }else {
 343         SysFreeString(str);
 344     }
 345     return S_OK;
 346 }
 347
 348 static HRESULT array_to_args(script_ctx_t *ctx, DispatchEx *arg_array, jsexcept_t *ei, IServiceProvider *caller,
 349         DISPPARAMS *args)
 350 {
 351     VARIANT var, *argv;
 352     DWORD length, i;
 353     HRESULT hres;
 354
 355     hres = jsdisp_propget_name(arg_array, lengthW, &var, ei, NULL/*FIXME*/);
 356     if(FAILED(hres))
 357         return hres;
 358
 359     hres = to_uint32(ctx, &var, ei, &length);
 360     VariantClear(&var);
 361     if(FAILED(hres))
 362         return hres;
 363
 364     argv = heap_alloc(length * sizeof(VARIANT));
 365     if(!argv)
 366         return E_OUTOFMEMORY;
 367
 368     for(i=0; i<length; i++) {
 369         hres = jsdisp_propget_idx(arg_array, i, argv+i, ei, caller);
 370         if(FAILED(hres)) {
 371             while(i--)
 372                 VariantClear(argv+i);
 373             heap_free(argv);
 374             return hres;
 375         }
 376     }
 377
 378     args->cArgs = length;
 379     args->rgvarg = argv;
 380     return S_OK;
 381 }
 382
 383 static HRESULT Function_apply(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 384         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 385 {
 386     FunctionInstance *function;
 387     DISPPARAMS args = {NULL,NULL,0,0};
 388     DWORD argc, i;
 389     IDispatch *this_obj = NULL;
 390     HRESULT hres = S_OK;
 391
 392     TRACE("\n");
 393
 394     if(!(function = function_this(jsthis)))
 395         return throw_type_error(ctx, ei, IDS_NOT_FUNC, NULL);
 396
 397     argc = arg_cnt(dp);
 398     if(argc) {
 399         hres = to_object(ctx, get_arg(dp,0), &this_obj);
 400         if(FAILED(hres))
 401             return hres;
 402     }
 403
 404     if(argc >= 2) {
 405         DispatchEx *arg_array = NULL;
 406
 407         if(V_VT(get_arg(dp,1)) == VT_DISPATCH) {
 408             arg_array = iface_to_jsdisp((IUnknown*)V_DISPATCH(get_arg(dp,1)));
 409             if(arg_array && (
 410                 !is_class(arg_array, JSCLASS_ARRAY) && !is_class(arg_array, JSCLASS_ARGUMENTS) )) {
 411                 jsdisp_release(arg_array);
 412                 arg_array = NULL;
 413             }
 414         }
 415
 416         if(arg_array) {
 417             hres = array_to_args(ctx, arg_array, ei, caller, &args);
 418             jsdisp_release(arg_array);
 419         }else {
 420             FIXME("throw TypeError\n");
 421             hres = E_FAIL;
 422         }
 423     }
 424
 425     hres = call_function(ctx, function, this_obj, &args, retv, ei, caller);
 426
 427     if(this_obj)
 428         IDispatch_Release(this_obj);
 429     for(i=0; i<args.cArgs; i++)
 430         VariantClear(args.rgvarg+i);
 431     heap_free(args.rgvarg);
 432     return hres;
 433 }
 434
 435 static HRESULT Function_call(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 436         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 437 {
 438     FunctionInstance *function;
 439     DISPPARAMS args = {NULL,NULL,0,0};
 440     IDispatch *this_obj = NULL;
 441     DWORD argc;
 442     HRESULT hres;
 443
 444     TRACE("\n");
 445
 446     if(!(function = function_this(jsthis)))
 447         return throw_type_error(ctx, ei, IDS_NOT_FUNC, NULL);
 448
 449     argc = arg_cnt(dp);
 450     if(argc) {
 451         hres = to_object(ctx, get_arg(dp,0), &this_obj);
 452         if(FAILED(hres))
 453             return hres;
 454         args.cArgs = argc-1;
 455     }
 456
 457     if(args.cArgs)
 458         args.rgvarg = dp->rgvarg + dp->cArgs - args.cArgs-1;
 459
 460     hres = call_function(ctx, function, this_obj, &args, retv, ei, caller);
 461
 462     if(this_obj)
 463         IDispatch_Release(this_obj);
 464     return hres;
 465 }
 466
 467 HRESULT Function_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 468         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 469 {
 470     FunctionInstance *function;
 471
 472     TRACE("\n");
 473
 474     if(!is_vclass(jsthis, JSCLASS_FUNCTION)) {
 475         ERR("dispex is not a function\n");
 476         return E_FAIL;
 477     }
 478
 479     function = (FunctionInstance*)jsthis->u.jsdisp;
 480
 481     switch(flags) {
 482     case DISPATCH_METHOD:
 483         if(function->value_proc)
 484             return invoke_value_proc(ctx, function, get_this(dp), flags, dp, retv, ei, caller);
 485
 486         return invoke_source(ctx, function, get_this(dp), dp, retv, ei, caller);
 487
 488     case DISPATCH_PROPERTYGET: {
 489         HRESULT hres;
 490         BSTR str;
 491
 492         hres = function_to_string(function, &str);
 493         if(FAILED(hres))
 494             return hres;
 495
 496         V_VT(retv) = VT_BSTR;
 497         V_BSTR(retv) = str;
 498         break;
 499     }
 500
 501     case DISPATCH_CONSTRUCT:
 502         if(function->value_proc)
 503             return invoke_value_proc(ctx, function, get_this(dp), flags, dp, retv, ei, caller);
 504
 505         return invoke_constructor(ctx, function, dp, retv, ei, caller);
 506
 507     default:
 508         FIXME("not implemented flags %x\n", flags);
 509         return E_NOTIMPL;
 510     }
 511
 512     return S_OK;
 513 }
 514
 515 static void Function_destructor(DispatchEx *dispex)
 516 {
 517     FunctionInstance *This = (FunctionInstance*)dispex;
 518
 519     if(This->parser)
 520         parser_release(This->parser);
 521     if(This->scope_chain)
 522         scope_release(This->scope_chain);
 523     heap_free(This);
 524 }
 525
 526 static const builtin_prop_t Function_props[] = {
 527     {applyW,                 Function_apply,                 PROPF_METHOD|2},
 528     {callW,                  Function_call,                  PROPF_METHOD|1},
 529     {lengthW,                Function_length,                0},
 530     {toStringW,              Function_toString,              PROPF_METHOD}
 531 };
 532
 533 static const builtin_info_t Function_info = {
 534     JSCLASS_FUNCTION,
 535     {NULL, Function_value, 0},
 536     sizeof(Function_props)/sizeof(*Function_props),
 537     Function_props,
 538     Function_destructor,
 539     NULL
 540 };
 541
 542 static HRESULT FunctionConstr_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 543         VARIANT *retv, jsexcept_t *ei, IServiceProvider *sp)
 544 {
 545     FIXME("\n");
 546     return E_NOTIMPL;
 547 }
 548
 549 static HRESULT FunctionProt_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 550         VARIANT *retv, jsexcept_t *ei, IServiceProvider *sp)
 551 {
 552     FIXME("\n");
 553     return E_NOTIMPL;
 554 }
 555
 556 static HRESULT create_function(script_ctx_t *ctx, const builtin_info_t *builtin_info, DWORD flags,
 557         BOOL funcprot, DispatchEx *prototype, FunctionInstance **ret)
 558 {
 559     FunctionInstance *function;
 560     HRESULT hres;
 561
 562     function = heap_alloc_zero(sizeof(FunctionInstance));
 563     if(!function)
 564         return E_OUTOFMEMORY;
 565
 566     if(funcprot)
 567         hres = init_dispex(&function->dispex, ctx, &Function_info, prototype);
 568     else if(builtin_info)
 569         hres = init_dispex_from_constr(&function->dispex, ctx, builtin_info, ctx->function_constr);
 570     else
 571         hres = init_dispex_from_constr(&function->dispex, ctx, &Function_info, ctx->function_constr);
 572     if(FAILED(hres))
 573         return hres;
 574
 575     function->flags = flags;
 576     function->length = flags & PROPF_ARGMASK;
 577
 578     *ret = function;
 579     return S_OK;
 580 }
 581
 582 static HRESULT set_prototype(script_ctx_t *ctx, DispatchEx *dispex, DispatchEx *prototype)
 583 {
 584     jsexcept_t jsexcept;
 585     VARIANT var;
 586
 587     V_VT(&var) = VT_DISPATCH;
 588     V_DISPATCH(&var) = (IDispatch*)_IDispatchEx_(prototype);
 589     memset(&jsexcept, 0, sizeof(jsexcept));
 590
 591     return jsdisp_propput_name(dispex, prototypeW, &var, &jsexcept, NULL/*FIXME*/);
 592 }
 593
 594 HRESULT create_builtin_function(script_ctx_t *ctx, builtin_invoke_t value_proc, const WCHAR *name,
 595         const builtin_info_t *builtin_info, DWORD flags, DispatchEx *prototype, DispatchEx **ret)
 596 {
 597     FunctionInstance *function;
 598     HRESULT hres;
 599
 600     hres = create_function(ctx, builtin_info, flags, FALSE, NULL, &function);
 601     if(FAILED(hres))
 602         return hres;
 603
 604     hres = set_prototype(ctx, &function->dispex, prototype);
 605     if(FAILED(hres)) {
 606         jsdisp_release(&function->dispex);
 607         return hres;
 608     }
 609
 610     function->value_proc = value_proc;
 611     function->name = name;
 612
 613     *ret = &function->dispex;
 614     return S_OK;
 615 }
 616
 617 HRESULT create_source_function(parser_ctx_t *ctx, parameter_t *parameters, source_elements_t *source,
 618         scope_chain_t *scope_chain, const WCHAR *src_str, DWORD src_len, DispatchEx **ret)
 619 {
 620     FunctionInstance *function;
 621     DispatchEx *prototype;
 622     parameter_t *iter;
 623     DWORD length = 0;
 624     HRESULT hres;
 625
 626     hres = create_object(ctx->script, NULL, &prototype);
 627     if(FAILED(hres))
 628         return hres;
 629
 630     hres = create_function(ctx->script, NULL, PROPF_CONSTR, FALSE, NULL, &function);
 631     if(SUCCEEDED(hres)) {
 632         hres = set_prototype(ctx->script, &function->dispex, prototype);
 633         if(FAILED(hres))
 634             jsdisp_release(&function->dispex);
 635     }
 636     jsdisp_release(prototype);
 637     if(FAILED(hres))
 638         return hres;
 639
 640     function->source = source;
 641     function->parameters = parameters;
 642
 643     if(scope_chain) {
 644         scope_addref(scope_chain);
 645         function->scope_chain = scope_chain;
 646     }
 647
 648     parser_addref(ctx);
 649     function->parser = ctx;
 650
 651     for(iter = parameters; iter; iter = iter->next)
 652         length++;
 653     function->length = length;
 654
 655     function->src_str = src_str;
 656     function->src_len = src_len;
 657
 658     *ret = &function->dispex;
 659     return S_OK;
 660 }
 661
 662 HRESULT init_function_constr(script_ctx_t *ctx, DispatchEx *object_prototype)
 663 {
 664     FunctionInstance *prot, *constr;
 665     HRESULT hres;
 666
 667     static const WCHAR FunctionW[] = {'F','u','n','c','t','i','o','n',0};
 668
 669     hres = create_function(ctx, NULL, PROPF_CONSTR, TRUE, object_prototype, &prot);
 670     if(FAILED(hres))
 671         return hres;
 672
 673     prot->value_proc = FunctionProt_value;
 674     prot->name = prototypeW;
 675
 676     hres = create_function(ctx, NULL, PROPF_CONSTR, TRUE, &prot->dispex, &constr);
 677     if(SUCCEEDED(hres)) {
 678         constr->value_proc = FunctionConstr_value;
 679         constr->name = FunctionW;
 680         hres = set_prototype(ctx, &constr->dispex, &prot->dispex);
 681         if(FAILED(hres))
 682             jsdisp_release(&constr->dispex);
 683     }
 684     jsdisp_release(&prot->dispex);
 685     if(FAILED(hres))
 686         return hres;
 687
 688     ctx->function_constr = &constr->dispex;
 689     return S_OK;
 690 }