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     jsdisp_t 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     jsdisp_t *arguments;
  39 } FunctionInstance;
  40
  41 static inline FunctionInstance *function_from_vdisp(vdisp_t *vdisp)
  42 {
  43     return (FunctionInstance*)vdisp->u.jsdisp;
  44 }
  45
  46 static inline FunctionInstance *function_this(vdisp_t *jsthis)
  47 {
  48     return is_vclass(jsthis, JSCLASS_FUNCTION) ? function_from_vdisp(jsthis) : NULL;
  49 }
  50
  51 static const WCHAR prototypeW[] = {'p','r','o','t','o','t', 'y', 'p','e',0};
  52
  53 static const WCHAR lengthW[] = {'l','e','n','g','t','h',0};
  54 static const WCHAR toStringW[] = {'t','o','S','t','r','i','n','g',0};
  55 static const WCHAR applyW[] = {'a','p','p','l','y',0};
  56 static const WCHAR callW[] = {'c','a','l','l',0};
  57 static const WCHAR argumentsW[] = {'a','r','g','u','m','e','n','t','s',0};
  58
  59 static IDispatch *get_this(DISPPARAMS *dp)
  60 {
  61     DWORD i;
  62
  63     for(i=0; i < dp->cNamedArgs; i++) {
  64         if(dp->rgdispidNamedArgs[i] == DISPID_THIS) {
  65             if(V_VT(dp->rgvarg+i) == VT_DISPATCH)
  66                 return V_DISPATCH(dp->rgvarg+i);
  67
  68             WARN("This is not VT_DISPATCH\n");
  69             return NULL;
  70         }
  71     }
  72
  73     TRACE("no this passed\n");
  74     return NULL;
  75 }
  76
  77 static HRESULT init_parameters(jsdisp_t *var_disp, FunctionInstance *function, DISPPARAMS *dp,
  78         jsexcept_t *ei, IServiceProvider *caller)
  79 {
  80     parameter_t *param;
  81     VARIANT var_empty;
  82     DWORD cargs, i=0;
  83     HRESULT hres;
  84
  85     V_VT(&var_empty) = VT_EMPTY;
  86     cargs = arg_cnt(dp);
  87
  88     for(param = function->parameters; param; param = param->next) {
  89         hres = jsdisp_propput_name(var_disp, param->identifier,
  90                 i < cargs ? get_arg(dp,i) : &var_empty, ei, caller);
  91         if(FAILED(hres))
  92             return hres;
  93
  94         i++;
  95     }
  96
  97     return S_OK;
  98 }
  99
 100 static HRESULT Arguments_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 101         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 102 {
 103     FIXME("\n");
 104     return E_NOTIMPL;
 105 }
 106
 107 static const builtin_info_t Arguments_info = {
 108     JSCLASS_ARGUMENTS,
 109     {NULL, Arguments_value, 0},
 110     0, NULL,
 111     NULL,
 112     NULL
 113 };
 114
 115 static HRESULT create_arguments(script_ctx_t *ctx, IDispatch *calee, DISPPARAMS *dp,
 116         jsexcept_t *ei, IServiceProvider *caller, jsdisp_t **ret)
 117 {
 118     jsdisp_t *args;
 119     VARIANT var;
 120     DWORD i;
 121     HRESULT hres;
 122
 123     static const WCHAR caleeW[] = {'c','a','l','l','e','e',0};
 124
 125     args = heap_alloc_zero(sizeof(jsdisp_t));
 126     if(!args)
 127         return E_OUTOFMEMORY;
 128
 129     hres = init_dispex_from_constr(args, ctx, &Arguments_info, ctx->object_constr);
 130     if(FAILED(hres)) {
 131         heap_free(args);
 132         return hres;
 133     }
 134
 135     for(i=0; i < arg_cnt(dp); i++) {
 136         hres = jsdisp_propput_idx(args, i, get_arg(dp,i), ei, caller);
 137         if(FAILED(hres))
 138             break;
 139     }
 140
 141     if(SUCCEEDED(hres)) {
 142         V_VT(&var) = VT_I4;
 143         V_I4(&var) = arg_cnt(dp);
 144         hres = jsdisp_propput_name(args, lengthW, &var, ei, caller);
 145
 146         if(SUCCEEDED(hres)) {
 147             V_VT(&var) = VT_DISPATCH;
 148             V_DISPATCH(&var) = calee;
 149             hres = jsdisp_propput_name(args, caleeW, &var, ei, caller);
 150         }
 151     }
 152
 153     if(FAILED(hres)) {
 154         jsdisp_release(args);
 155         return hres;
 156     }
 157
 158     *ret = args;
 159     return S_OK;
 160 }
 161
 162 static HRESULT create_var_disp(script_ctx_t *ctx, FunctionInstance *function, jsdisp_t *arg_disp,
 163         DISPPARAMS *dp, jsexcept_t *ei, IServiceProvider *caller, jsdisp_t **ret)
 164 {
 165     jsdisp_t *var_disp;
 166     VARIANT var;
 167     HRESULT hres;
 168
 169     hres = create_dispex(ctx, NULL, NULL, &var_disp);
 170     if(FAILED(hres))
 171         return hres;
 172
 173     V_VT(&var) = VT_DISPATCH;
 174     V_DISPATCH(&var) = (IDispatch*)_IDispatchEx_(arg_disp);
 175     hres = jsdisp_propput_name(var_disp, argumentsW, &var, ei, caller);
 176     if(SUCCEEDED(hres))
 177         hres = init_parameters(var_disp, function, dp, ei, caller);
 178     if(FAILED(hres)) {
 179         jsdisp_release(var_disp);
 180         return hres;
 181     }
 182
 183     *ret = var_disp;
 184     return S_OK;
 185 }
 186
 187 static HRESULT invoke_source(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_obj, DISPPARAMS *dp,
 188         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 189 {
 190     jsdisp_t *var_disp, *arg_disp;
 191     exec_ctx_t *exec_ctx;
 192     scope_chain_t *scope;
 193     HRESULT hres;
 194
 195     if(!function->source) {
 196         FIXME("no source\n");
 197         return E_FAIL;
 198     }
 199
 200     hres = create_arguments(ctx, (IDispatch*)_IDispatchEx_(&function->dispex),
 201             dp, ei, caller, &arg_disp);
 202     if(FAILED(hres))
 203         return hres;
 204
 205     hres = create_var_disp(ctx, function, arg_disp, dp, ei, caller, &var_disp);
 206     if(FAILED(hres)) {
 207         jsdisp_release(arg_disp);
 208         return hres;
 209     }
 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     jsdisp_release(var_disp);
 217     if(SUCCEEDED(hres)) {
 218         jsdisp_t *prev_args;
 219
 220         prev_args = function->arguments;
 221         function->arguments = arg_disp;
 222         hres = exec_source(exec_ctx, function->parser, function->source, EXECT_FUNCTION, ei, retv);
 223         function->arguments = prev_args;
 224
 225         jsdisp_release(arg_disp);
 226         exec_release(exec_ctx);
 227     }
 228
 229     return hres;
 230 }
 231
 232 static HRESULT invoke_constructor(script_ctx_t *ctx, FunctionInstance *function, DISPPARAMS *dp,
 233         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 234 {
 235     jsdisp_t *this_obj;
 236     VARIANT var;
 237     HRESULT hres;
 238
 239     hres = create_object(ctx, &function->dispex, &this_obj);
 240     if(FAILED(hres))
 241         return hres;
 242
 243     hres = invoke_source(ctx, function, (IDispatch*)_IDispatchEx_(this_obj), dp, &var, ei, caller);
 244     if(FAILED(hres)) {
 245         jsdisp_release(this_obj);
 246         return hres;
 247     }
 248
 249     V_VT(retv) = VT_DISPATCH;
 250     if(V_VT(&var) == VT_DISPATCH) {
 251         jsdisp_release(this_obj);
 252         V_DISPATCH(retv) = V_DISPATCH(&var);
 253     }else {
 254         VariantClear(&var);
 255         V_DISPATCH(retv) = (IDispatch*)_IDispatchEx_(this_obj);
 256     }
 257     return S_OK;
 258 }
 259
 260 static HRESULT invoke_value_proc(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_disp, WORD flags, DISPPARAMS *dp,
 261         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 262 {
 263     vdisp_t vthis;
 264     HRESULT hres;
 265
 266     if(this_disp)
 267         set_disp(&vthis, this_disp);
 268     else if(ctx->host_global)
 269         set_disp(&vthis, ctx->host_global);
 270     else
 271         set_jsdisp(&vthis, ctx->global);
 272
 273     hres = function->value_proc(ctx, &vthis, flags, dp, retv, ei, caller);
 274
 275     vdisp_release(&vthis);
 276     return hres;
 277 }
 278
 279 static HRESULT call_function(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_obj, DISPPARAMS *args,
 280         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 281 {
 282     if(function->value_proc)
 283         return invoke_value_proc(ctx, function, this_obj, DISPATCH_METHOD, args, retv, ei, caller);
 284
 285     return invoke_source(ctx, function, this_obj, args, retv, ei, caller);
 286 }
 287
 288 static HRESULT function_to_string(FunctionInstance *function, BSTR *ret)
 289 {
 290     BSTR str;
 291
 292     static const WCHAR native_prefixW[] = {'\n','f','u','n','c','t','i','o','n',' '};
 293     static const WCHAR native_suffixW[] =
 294         {'(',')',' ','{','\n',' ',' ',' ',' ','[','n','a','t','i','v','e',' ','c','o','d','e',']','\n','}','\n'};
 295
 296     if(function->value_proc) {
 297         DWORD name_len;
 298
 299         name_len = strlenW(function->name);
 300         str = SysAllocStringLen(NULL, sizeof(native_prefixW) + name_len*sizeof(WCHAR) + sizeof(native_suffixW));
 301         if(!str)
 302             return E_OUTOFMEMORY;
 303
 304         memcpy(str, native_prefixW, sizeof(native_prefixW));
 305         memcpy(str + sizeof(native_prefixW)/sizeof(WCHAR), function->name, name_len*sizeof(WCHAR));
 306         memcpy(str + sizeof(native_prefixW)/sizeof(WCHAR) + name_len, native_suffixW, sizeof(native_suffixW));
 307     }else {
 308         str = SysAllocStringLen(function->src_str, function->src_len);
 309         if(!str)
 310             return E_OUTOFMEMORY;
 311     }
 312
 313     *ret = str;
 314     return S_OK;
 315 }
 316
 317 static HRESULT Function_length(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 318         VARIANT *retv, jsexcept_t *ei, IServiceProvider *sp)
 319 {
 320     FunctionInstance *This = function_from_vdisp(jsthis);
 321
 322     TRACE("%p %d\n", This, This->length);
 323
 324     switch(flags) {
 325     case DISPATCH_PROPERTYGET:
 326         V_VT(retv) = VT_I4;
 327         V_I4(retv) = This->length;
 328         break;
 329     default:
 330         FIXME("unimplemented flags %x\n", flags);
 331         return E_NOTIMPL;
 332     }
 333
 334     return S_OK;
 335 }
 336
 337 static HRESULT Function_toString(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 338         VARIANT *retv, jsexcept_t *ei, IServiceProvider *sp)
 339 {
 340     FunctionInstance *function;
 341     BSTR str;
 342     HRESULT hres;
 343
 344     TRACE("\n");
 345
 346     if(!(function = function_this(jsthis)))
 347         return throw_type_error(ctx, ei, IDS_NOT_FUNC, NULL);
 348
 349     hres = function_to_string(function, &str);
 350     if(FAILED(hres))
 351         return hres;
 352
 353     if(retv) {
 354         V_VT(retv) = VT_BSTR;
 355         V_BSTR(retv) = str;
 356     }else {
 357         SysFreeString(str);
 358     }
 359     return S_OK;
 360 }
 361
 362 static HRESULT array_to_args(script_ctx_t *ctx, jsdisp_t *arg_array, jsexcept_t *ei, IServiceProvider *caller,
 363         DISPPARAMS *args)
 364 {
 365     VARIANT var, *argv;
 366     DWORD length, i;
 367     HRESULT hres;
 368
 369     hres = jsdisp_propget_name(arg_array, lengthW, &var, ei, NULL/*FIXME*/);
 370     if(FAILED(hres))
 371         return hres;
 372
 373     hres = to_uint32(ctx, &var, ei, &length);
 374     VariantClear(&var);
 375     if(FAILED(hres))
 376         return hres;
 377
 378     argv = heap_alloc(length * sizeof(VARIANT));
 379     if(!argv)
 380         return E_OUTOFMEMORY;
 381
 382     for(i=0; i<length; i++) {
 383         hres = jsdisp_get_idx(arg_array, i, argv+i, ei, caller);
 384         if(hres == DISP_E_UNKNOWNNAME)
 385             V_VT(argv+i) = VT_EMPTY;
 386         else if(FAILED(hres)) {
 387             while(i--)
 388                 VariantClear(argv+i);
 389             heap_free(argv);
 390             return hres;
 391         }
 392     }
 393
 394     args->cArgs = length;
 395     args->rgvarg = argv;
 396     return S_OK;
 397 }
 398
 399 static HRESULT Function_apply(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 400         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 401 {
 402     FunctionInstance *function;
 403     DISPPARAMS args = {NULL,NULL,0,0};
 404     DWORD argc, i;
 405     IDispatch *this_obj = NULL;
 406     HRESULT hres = S_OK;
 407
 408     TRACE("\n");
 409
 410     if(!(function = function_this(jsthis)))
 411         return throw_type_error(ctx, ei, IDS_NOT_FUNC, NULL);
 412
 413     argc = arg_cnt(dp);
 414     if(argc) {
 415         VARIANT *v = get_arg(dp,0);
 416
 417         if(V_VT(v) != VT_EMPTY && V_VT(v) != VT_NULL) {
 418             hres = to_object(ctx, v, &this_obj);
 419             if(FAILED(hres))
 420                 return hres;
 421         }
 422     }
 423
 424     if(argc >= 2) {
 425         jsdisp_t *arg_array = NULL;
 426
 427         if(V_VT(get_arg(dp,1)) == VT_DISPATCH) {
 428             arg_array = iface_to_jsdisp((IUnknown*)V_DISPATCH(get_arg(dp,1)));
 429             if(arg_array &&
 430                (!is_class(arg_array, JSCLASS_ARRAY) && !is_class(arg_array, JSCLASS_ARGUMENTS) )) {
 431                 jsdisp_release(arg_array);
 432                 arg_array = NULL;
 433             }
 434         }
 435
 436         if(arg_array) {
 437             hres = array_to_args(ctx, arg_array, ei, caller, &args);
 438             jsdisp_release(arg_array);
 439         }else {
 440             FIXME("throw TypeError\n");
 441             hres = E_FAIL;
 442         }
 443     }
 444
 445     hres = call_function(ctx, function, this_obj, &args, retv, ei, caller);
 446
 447     if(this_obj)
 448         IDispatch_Release(this_obj);
 449     for(i=0; i<args.cArgs; i++)
 450         VariantClear(args.rgvarg+i);
 451     heap_free(args.rgvarg);
 452     return hres;
 453 }
 454
 455 static HRESULT Function_call(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 456         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 457 {
 458     FunctionInstance *function;
 459     DISPPARAMS args = {NULL,NULL,0,0};
 460     IDispatch *this_obj = NULL;
 461     DWORD argc;
 462     HRESULT hres;
 463
 464     TRACE("\n");
 465
 466     if(!(function = function_this(jsthis)))
 467         return throw_type_error(ctx, ei, IDS_NOT_FUNC, NULL);
 468
 469     argc = arg_cnt(dp);
 470     if(argc) {
 471         VARIANT *v = get_arg(dp,0);
 472
 473         if(V_VT(v) != VT_EMPTY && V_VT(v) != VT_NULL) {
 474             hres = to_object(ctx, v, &this_obj);
 475             if(FAILED(hres))
 476                 return hres;
 477         }
 478
 479         args.cArgs = argc-1;
 480     }
 481
 482     if(args.cArgs)
 483         args.rgvarg = dp->rgvarg + dp->cArgs - args.cArgs-1;
 484
 485     hres = call_function(ctx, function, this_obj, &args, retv, ei, caller);
 486
 487     if(this_obj)
 488         IDispatch_Release(this_obj);
 489     return hres;
 490 }
 491
 492 HRESULT Function_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 493         VARIANT *retv, jsexcept_t *ei, IServiceProvider *caller)
 494 {
 495     FunctionInstance *function;
 496
 497     TRACE("\n");
 498
 499     if(!is_vclass(jsthis, JSCLASS_FUNCTION)) {
 500         ERR("dispex is not a function\n");
 501         return E_FAIL;
 502     }
 503
 504     function = (FunctionInstance*)jsthis->u.jsdisp;
 505
 506     switch(flags) {
 507     case DISPATCH_METHOD:
 508         if(function->value_proc)
 509             return invoke_value_proc(ctx, function, get_this(dp), flags, dp, retv, ei, caller);
 510
 511         return invoke_source(ctx, function, get_this(dp), dp, retv, ei, caller);
 512
 513     case DISPATCH_PROPERTYGET: {
 514         HRESULT hres;
 515         BSTR str;
 516
 517         hres = function_to_string(function, &str);
 518         if(FAILED(hres))
 519             return hres;
 520
 521         V_VT(retv) = VT_BSTR;
 522         V_BSTR(retv) = str;
 523         break;
 524     }
 525
 526     case DISPATCH_CONSTRUCT:
 527         if(function->value_proc)
 528             return invoke_value_proc(ctx, function, get_this(dp), flags, dp, retv, ei, caller);
 529
 530         return invoke_constructor(ctx, function, dp, retv, ei, caller);
 531
 532     default:
 533         FIXME("not implemented flags %x\n", flags);
 534         return E_NOTIMPL;
 535     }
 536
 537     return S_OK;
 538 }
 539
 540 static HRESULT Function_arguments(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags,
 541         DISPPARAMS *dp, VARIANT *retv, jsexcept_t *ei, IServiceProvider *sp)
 542 {
 543     FunctionInstance *function = (FunctionInstance*)jsthis->u.jsdisp;
 544     HRESULT hres = S_OK;
 545
 546     TRACE("\n");
 547
 548     switch(flags) {
 549     case DISPATCH_PROPERTYGET: {
 550         if(function->arguments) {
 551             IDispatchEx_AddRef(_IDispatchEx_(function->arguments));
 552             V_VT(retv) = VT_DISPATCH;
 553             V_DISPATCH(retv) = (IDispatch*)_IDispatchEx_(function->arguments);
 554         }else {
 555             V_VT(retv) = VT_NULL;
 556         }
 557         break;
 558     }
 559     case DISPATCH_PROPERTYPUT:
 560         break;
 561     default:
 562         FIXME("unimplemented flags %x\n", flags);
 563         hres = E_NOTIMPL;
 564     }
 565
 566     return hres;
 567 }
 568
 569 static void Function_destructor(jsdisp_t *dispex)
 570 {
 571     FunctionInstance *This = (FunctionInstance*)dispex;
 572
 573     if(This->parser)
 574         parser_release(This->parser);
 575     if(This->scope_chain)
 576         scope_release(This->scope_chain);
 577     heap_free(This);
 578 }
 579
 580 static const builtin_prop_t Function_props[] = {
 581     {applyW,                 Function_apply,                 PROPF_METHOD|2},
 582     {argumentsW,             Function_arguments,             0},
 583     {callW,                  Function_call,                  PROPF_METHOD|1},
 584     {lengthW,                Function_length,                0},
 585     {toStringW,              Function_toString,              PROPF_METHOD}
 586 };
 587
 588 static const builtin_info_t Function_info = {
 589     JSCLASS_FUNCTION,
 590     {NULL, Function_value, 0},
 591     sizeof(Function_props)/sizeof(*Function_props),
 592     Function_props,
 593     Function_destructor,
 594     NULL
 595 };
 596
 597 static HRESULT create_function(script_ctx_t *ctx, const builtin_info_t *builtin_info, DWORD flags,
 598         BOOL funcprot, jsdisp_t *prototype, FunctionInstance **ret)
 599 {
 600     FunctionInstance *function;
 601     HRESULT hres;
 602
 603     function = heap_alloc_zero(sizeof(FunctionInstance));
 604     if(!function)
 605         return E_OUTOFMEMORY;
 606
 607     if(funcprot)
 608         hres = init_dispex(&function->dispex, ctx, &Function_info, prototype);
 609     else if(builtin_info)
 610         hres = init_dispex_from_constr(&function->dispex, ctx, builtin_info, ctx->function_constr);
 611     else
 612         hres = init_dispex_from_constr(&function->dispex, ctx, &Function_info, ctx->function_constr);
 613     if(FAILED(hres))
 614         return hres;
 615
 616     function->flags = flags;
 617     function->length = flags & PROPF_ARGMASK;
 618
 619     *ret = function;
 620     return S_OK;
 621 }
 622
 623 static HRESULT set_prototype(script_ctx_t *ctx, jsdisp_t *dispex, jsdisp_t *prototype)
 624 {
 625     jsexcept_t jsexcept;
 626     VARIANT var;
 627
 628     V_VT(&var) = VT_DISPATCH;
 629     V_DISPATCH(&var) = (IDispatch*)_IDispatchEx_(prototype);
 630     memset(&jsexcept, 0, sizeof(jsexcept));
 631
 632     return jsdisp_propput_name(dispex, prototypeW, &var, &jsexcept, NULL/*FIXME*/);
 633 }
 634
 635 HRESULT create_builtin_function(script_ctx_t *ctx, builtin_invoke_t value_proc, const WCHAR *name,
 636         const builtin_info_t *builtin_info, DWORD flags, jsdisp_t *prototype, jsdisp_t **ret)
 637 {
 638     FunctionInstance *function;
 639     HRESULT hres;
 640
 641     hres = create_function(ctx, builtin_info, flags, FALSE, NULL, &function);
 642     if(FAILED(hres))
 643         return hres;
 644
 645     if(builtin_info) {
 646         VARIANT var;
 647
 648         V_VT(&var) = VT_I4;
 649         V_I4(&var) = function->length;
 650         hres = jsdisp_propput_const(&function->dispex, lengthW, &var);
 651     }
 652
 653     if(SUCCEEDED(hres))
 654         hres = set_prototype(ctx, &function->dispex, prototype);
 655     if(FAILED(hres)) {
 656         jsdisp_release(&function->dispex);
 657         return hres;
 658     }
 659
 660     function->value_proc = value_proc;
 661     function->name = name;
 662
 663     *ret = &function->dispex;
 664     return S_OK;
 665 }
 666
 667 HRESULT create_source_function(parser_ctx_t *ctx, parameter_t *parameters, source_elements_t *source,
 668         scope_chain_t *scope_chain, const WCHAR *src_str, DWORD src_len, jsdisp_t **ret)
 669 {
 670     FunctionInstance *function;
 671     jsdisp_t *prototype;
 672     parameter_t *iter;
 673     DWORD length = 0;
 674     HRESULT hres;
 675
 676     hres = create_object(ctx->script, NULL, &prototype);
 677     if(FAILED(hres))
 678         return hres;
 679
 680     hres = create_function(ctx->script, NULL, PROPF_CONSTR, FALSE, NULL, &function);
 681     if(SUCCEEDED(hres)) {
 682         hres = set_prototype(ctx->script, &function->dispex, prototype);
 683         if(FAILED(hres))
 684             jsdisp_release(&function->dispex);
 685     }
 686     jsdisp_release(prototype);
 687     if(FAILED(hres))
 688         return hres;
 689
 690     function->source = source;
 691     function->parameters = parameters;
 692
 693     if(scope_chain) {
 694         scope_addref(scope_chain);
 695         function->scope_chain = scope_chain;
 696     }
 697
 698     parser_addref(ctx);
 699     function->parser = ctx;
 700
 701     for(iter = parameters; iter; iter = iter->next)
 702         length++;
 703     function->length = length;
 704
 705     function->src_str = src_str;
 706     function->src_len = src_len;
 707
 708     *ret = &function->dispex;
 709     return S_OK;
 710 }
 711
 712 static HRESULT construct_function(script_ctx_t *ctx, DISPPARAMS *dp, jsexcept_t *ei, IDispatch **ret)
 713 {
 714     function_expression_t *expr;
 715     WCHAR *str = NULL, *ptr;
 716     DWORD argc, len = 0, l;
 717     parser_ctx_t *parser;
 718     jsdisp_t *function;
 719     BSTR *params = NULL;
 720     int i=0, j=0;
 721     HRESULT hres = S_OK;
 722
 723     static const WCHAR function_anonymousW[] = {'f','u','n','c','t','i','o','n',' ','a','n','o','n','y','m','o','u','s','('};
 724     static const WCHAR function_beginW[] = {')',' ','{','\n'};
 725     static const WCHAR function_endW[] = {'\n','}',0};
 726
 727     argc = arg_cnt(dp);
 728     if(argc) {
 729         params = heap_alloc(argc*sizeof(BSTR));
 730         if(!params)
 731             return E_OUTOFMEMORY;
 732
 733         if(argc > 2)
 734             len = (argc-2)*2; /* separating commas */
 735         for(i=0; i < argc; i++) {
 736             hres = to_string(ctx, get_arg(dp,i), ei, params+i);
 737             if(FAILED(hres))
 738                 break;
 739             len += SysStringLen(params[i]);
 740         }
 741     }
 742
 743     if(SUCCEEDED(hres)) {
 744         len += (sizeof(function_anonymousW) + sizeof(function_beginW) + sizeof(function_endW)) / sizeof(WCHAR);
 745         str = heap_alloc(len*sizeof(WCHAR));
 746         if(str) {
 747             memcpy(str, function_anonymousW, sizeof(function_anonymousW));
 748             ptr = str + sizeof(function_anonymousW)/sizeof(WCHAR);
 749             if(argc > 1) {
 750                 while(1) {
 751                     l = SysStringLen(params[j]);
 752                     memcpy(ptr, params[j], l*sizeof(WCHAR));
 753                     ptr += l;
 754                     if(++j == argc-1)
 755                         break;
 756                     *ptr++ = ',';
 757                     *ptr++ = ' ';
 758                 }
 759             }
 760             memcpy(ptr, function_beginW, sizeof(function_beginW));
 761             ptr += sizeof(function_beginW)/sizeof(WCHAR);
 762             if(argc) {
 763                 l = SysStringLen(params[argc-1]);
 764                 memcpy(ptr, params[argc-1], l*sizeof(WCHAR));
 765                 ptr += l;
 766             }
 767             memcpy(ptr, function_endW, sizeof(function_endW));
 768
 769             TRACE("%s\n", debugstr_w(str));
 770         }else {
 771             hres = E_OUTOFMEMORY;
 772         }
 773     }
 774
 775     while(--i >= 0)
 776         SysFreeString(params[i]);
 777     heap_free(params);
 778     if(FAILED(hres))
 779         return hres;
 780
 781     hres = script_parse(ctx, str, NULL, &parser);
 782     heap_free(str);
 783     if(FAILED(hres))
 784         return hres;
 785
 786     if(!parser->source || !parser->source->functions || parser->source->functions->next || parser->source->variables) {
 787         ERR("Invalid parser result!\n");
 788         parser_release(parser);
 789         return E_UNEXPECTED;
 790     }
 791     expr = parser->source->functions->expr;
 792
 793     hres = create_source_function(parser, expr->parameter_list, expr->source_elements, NULL, expr->src_str,
 794             expr->src_len, &function);
 795     parser_release(parser);
 796     if(FAILED(hres))
 797         return hres;
 798
 799     *ret = (IDispatch*)_IDispatchEx_(function);
 800     return S_OK;
 801 }
 802
 803 static HRESULT FunctionConstr_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 804         VARIANT *retv, jsexcept_t *ei, IServiceProvider *sp)
 805 {
 806     HRESULT hres;
 807
 808     TRACE("\n");
 809
 810     switch(flags) {
 811     case DISPATCH_CONSTRUCT: {
 812         IDispatch *ret;
 813
 814         hres = construct_function(ctx, dp, ei, &ret);
 815         if(FAILED(hres))
 816             return hres;
 817
 818         V_VT(retv) = VT_DISPATCH;
 819         V_DISPATCH(retv) = ret;
 820         break;
 821     }
 822     default:
 823         FIXME("unimplemented flags %x\n", flags);
 824         return E_NOTIMPL;
 825     }
 826
 827     return S_OK;
 828 }
 829
 830 static HRESULT FunctionProt_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 831         VARIANT *retv, jsexcept_t *ei, IServiceProvider *sp)
 832 {
 833     FIXME("\n");
 834     return E_NOTIMPL;
 835 }
 836
 837 HRESULT init_function_constr(script_ctx_t *ctx, jsdisp_t *object_prototype)
 838 {
 839     FunctionInstance *prot, *constr;
 840     HRESULT hres;
 841
 842     static const WCHAR FunctionW[] = {'F','u','n','c','t','i','o','n',0};
 843
 844     hres = create_function(ctx, NULL, PROPF_CONSTR, TRUE, object_prototype, &prot);
 845     if(FAILED(hres))
 846         return hres;
 847
 848     prot->value_proc = FunctionProt_value;
 849     prot->name = prototypeW;
 850
 851     hres = create_function(ctx, NULL, PROPF_CONSTR|1, TRUE, &prot->dispex, &constr);
 852     if(SUCCEEDED(hres)) {
 853         constr->value_proc = FunctionConstr_value;
 854         constr->name = FunctionW;
 855         hres = set_prototype(ctx, &constr->dispex, &prot->dispex);
 856         if(FAILED(hres))
 857             jsdisp_release(&constr->dispex);
 858     }
 859     jsdisp_release(&prot->dispex);
 860     if(FAILED(hres))
 861         return hres;
 862
 863     ctx->function_constr = &constr->dispex;
 864     return S_OK;
 865 }