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     bytecode_t *code;
  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)
  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);
  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)
 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, 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);
 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);
 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);
 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, 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     var_set_jsdisp(&var, arg_disp);
 174     hres = jsdisp_propput_name(var_disp, argumentsW, &var, ei);
 175     if(SUCCEEDED(hres))
 176         hres = init_parameters(var_disp, function, dp, ei);
 177     if(FAILED(hres)) {
 178         jsdisp_release(var_disp);
 179         return hres;
 180     }
 181
 182     *ret = var_disp;
 183     return S_OK;
 184 }
 185
 186 static HRESULT invoke_source(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_obj, DISPPARAMS *dp,
 187         VARIANT *retv, jsexcept_t *ei)
 188 {
 189     jsdisp_t *var_disp, *arg_disp;
 190     exec_ctx_t *exec_ctx;
 191     scope_chain_t *scope;
 192     HRESULT hres;
 193
 194     if(!function->source) {
 195         FIXME("no source\n");
 196         return E_FAIL;
 197     }
 198
 199     hres = create_arguments(ctx, to_disp(&function->dispex), dp, ei, &arg_disp);
 200     if(FAILED(hres))
 201         return hres;
 202
 203     hres = create_var_disp(ctx, function, arg_disp, dp, ei, &var_disp);
 204     if(FAILED(hres)) {
 205         jsdisp_release(arg_disp);
 206         return hres;
 207     }
 208
 209     hres = scope_push(function->scope_chain, var_disp, &scope);
 210     if(SUCCEEDED(hres)) {
 211         hres = create_exec_ctx(ctx, this_obj, var_disp, scope, FALSE, &exec_ctx);
 212         scope_release(scope);
 213     }
 214     jsdisp_release(var_disp);
 215     if(SUCCEEDED(hres)) {
 216         jsdisp_t *prev_args;
 217
 218         prev_args = function->arguments;
 219         function->arguments = arg_disp;
 220         hres = exec_source(exec_ctx, function->code, function->source, FALSE, ei, retv);
 221         function->arguments = prev_args;
 222
 223         jsdisp_release(arg_disp);
 224         exec_release(exec_ctx);
 225     }
 226
 227     return hres;
 228 }
 229
 230 static HRESULT invoke_constructor(script_ctx_t *ctx, FunctionInstance *function, DISPPARAMS *dp,
 231         VARIANT *retv, jsexcept_t *ei)
 232 {
 233     jsdisp_t *this_obj;
 234     VARIANT var;
 235     HRESULT hres;
 236
 237     hres = create_object(ctx, &function->dispex, &this_obj);
 238     if(FAILED(hres))
 239         return hres;
 240
 241     hres = invoke_source(ctx, function, to_disp(this_obj), dp, &var, ei);
 242     if(FAILED(hres)) {
 243         jsdisp_release(this_obj);
 244         return hres;
 245     }
 246
 247     if(V_VT(&var) == VT_DISPATCH) {
 248         jsdisp_release(this_obj);
 249         V_VT(retv) = VT_DISPATCH;
 250         V_DISPATCH(retv) = V_DISPATCH(&var);
 251     }else {
 252         VariantClear(&var);
 253         var_set_jsdisp(retv, this_obj);
 254     }
 255     return S_OK;
 256 }
 257
 258 static HRESULT invoke_value_proc(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_disp, WORD flags, DISPPARAMS *dp,
 259         VARIANT *retv, jsexcept_t *ei)
 260 {
 261     vdisp_t vthis;
 262     HRESULT hres;
 263
 264     if(this_disp)
 265         set_disp(&vthis, this_disp);
 266     else if(ctx->host_global)
 267         set_disp(&vthis, ctx->host_global);
 268     else
 269         set_jsdisp(&vthis, ctx->global);
 270
 271     hres = function->value_proc(ctx, &vthis, flags, dp, retv, ei);
 272
 273     vdisp_release(&vthis);
 274     return hres;
 275 }
 276
 277 static HRESULT call_function(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_obj, DISPPARAMS *args,
 278         VARIANT *retv, jsexcept_t *ei)
 279 {
 280     if(function->value_proc)
 281         return invoke_value_proc(ctx, function, this_obj, DISPATCH_METHOD, args, retv, ei);
 282
 283     return invoke_source(ctx, function, this_obj, args, retv, ei);
 284 }
 285
 286 static HRESULT function_to_string(FunctionInstance *function, BSTR *ret)
 287 {
 288     BSTR str;
 289
 290     static const WCHAR native_prefixW[] = {'\n','f','u','n','c','t','i','o','n',' '};
 291     static const WCHAR native_suffixW[] =
 292         {'(',')',' ','{','\n',' ',' ',' ',' ','[','n','a','t','i','v','e',' ','c','o','d','e',']','\n','}','\n'};
 293
 294     if(function->value_proc) {
 295         DWORD name_len;
 296
 297         name_len = strlenW(function->name);
 298         str = SysAllocStringLen(NULL, sizeof(native_prefixW) + name_len*sizeof(WCHAR) + sizeof(native_suffixW));
 299         if(!str)
 300             return E_OUTOFMEMORY;
 301
 302         memcpy(str, native_prefixW, sizeof(native_prefixW));
 303         memcpy(str + sizeof(native_prefixW)/sizeof(WCHAR), function->name, name_len*sizeof(WCHAR));
 304         memcpy(str + sizeof(native_prefixW)/sizeof(WCHAR) + name_len, native_suffixW, sizeof(native_suffixW));
 305     }else {
 306         str = SysAllocStringLen(function->src_str, function->src_len);
 307         if(!str)
 308             return E_OUTOFMEMORY;
 309     }
 310
 311     *ret = str;
 312     return S_OK;
 313 }
 314
 315 static HRESULT Function_length(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 316         VARIANT *retv, jsexcept_t *ei)
 317 {
 318     FunctionInstance *This = function_from_vdisp(jsthis);
 319
 320     TRACE("%p %d\n", This, This->length);
 321
 322     switch(flags) {
 323     case DISPATCH_PROPERTYGET:
 324         V_VT(retv) = VT_I4;
 325         V_I4(retv) = This->length;
 326         break;
 327     default:
 328         FIXME("unimplemented flags %x\n", flags);
 329         return E_NOTIMPL;
 330     }
 331
 332     return S_OK;
 333 }
 334
 335 static HRESULT Function_toString(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 336         VARIANT *retv, jsexcept_t *ei)
 337 {
 338     FunctionInstance *function;
 339     BSTR str;
 340     HRESULT hres;
 341
 342     TRACE("\n");
 343
 344     if(!(function = function_this(jsthis)))
 345         return throw_type_error(ctx, ei, JS_E_FUNCTION_EXPECTED, NULL);
 346
 347     hres = function_to_string(function, &str);
 348     if(FAILED(hres))
 349         return hres;
 350
 351     if(retv) {
 352         V_VT(retv) = VT_BSTR;
 353         V_BSTR(retv) = str;
 354     }else {
 355         SysFreeString(str);
 356     }
 357     return S_OK;
 358 }
 359
 360 static HRESULT array_to_args(script_ctx_t *ctx, jsdisp_t *arg_array, jsexcept_t *ei, DISPPARAMS *args)
 361 {
 362     VARIANT var, *argv;
 363     DWORD length, i;
 364     HRESULT hres;
 365
 366     hres = jsdisp_propget_name(arg_array, lengthW, &var, ei);
 367     if(FAILED(hres))
 368         return hres;
 369
 370     hres = to_uint32(ctx, &var, ei, &length);
 371     VariantClear(&var);
 372     if(FAILED(hres))
 373         return hres;
 374
 375     argv = heap_alloc(length * sizeof(VARIANT));
 376     if(!argv)
 377         return E_OUTOFMEMORY;
 378
 379     for(i=0; i<length; i++) {
 380         hres = jsdisp_get_idx(arg_array, i, argv+i, ei);
 381         if(hres == DISP_E_UNKNOWNNAME)
 382             V_VT(argv+i) = VT_EMPTY;
 383         else if(FAILED(hres)) {
 384             while(i--)
 385                 VariantClear(argv+i);
 386             heap_free(argv);
 387             return hres;
 388         }
 389     }
 390
 391     args->cArgs = length;
 392     args->rgvarg = argv;
 393     return S_OK;
 394 }
 395
 396 static HRESULT Function_apply(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 397         VARIANT *retv, jsexcept_t *ei)
 398 {
 399     FunctionInstance *function;
 400     DISPPARAMS args = {NULL,NULL,0,0};
 401     DWORD argc, i;
 402     IDispatch *this_obj = NULL;
 403     HRESULT hres = S_OK;
 404
 405     TRACE("\n");
 406
 407     if(!(function = function_this(jsthis)))
 408         return throw_type_error(ctx, ei, JS_E_FUNCTION_EXPECTED, NULL);
 409
 410     argc = arg_cnt(dp);
 411     if(argc) {
 412         VARIANT *v = get_arg(dp,0);
 413
 414         if(V_VT(v) != VT_EMPTY && V_VT(v) != VT_NULL) {
 415             hres = to_object(ctx, v, &this_obj);
 416             if(FAILED(hres))
 417                 return hres;
 418         }
 419     }
 420
 421     if(argc >= 2) {
 422         jsdisp_t *arg_array = NULL;
 423
 424         if(V_VT(get_arg(dp,1)) == VT_DISPATCH) {
 425             arg_array = iface_to_jsdisp((IUnknown*)V_DISPATCH(get_arg(dp,1)));
 426             if(arg_array &&
 427                (!is_class(arg_array, JSCLASS_ARRAY) && !is_class(arg_array, JSCLASS_ARGUMENTS) )) {
 428                 jsdisp_release(arg_array);
 429                 arg_array = NULL;
 430             }
 431         }
 432
 433         if(arg_array) {
 434             hres = array_to_args(ctx, arg_array, ei, &args);
 435             jsdisp_release(arg_array);
 436         }else {
 437             FIXME("throw TypeError\n");
 438             hres = E_FAIL;
 439         }
 440     }
 441
 442     if(SUCCEEDED(hres))
 443        hres = call_function(ctx, function, this_obj, &args, retv, ei);
 444
 445     if(this_obj)
 446         IDispatch_Release(this_obj);
 447     for(i=0; i<args.cArgs; i++)
 448         VariantClear(args.rgvarg+i);
 449     heap_free(args.rgvarg);
 450     return hres;
 451 }
 452
 453 static HRESULT Function_call(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 454         VARIANT *retv, jsexcept_t *ei)
 455 {
 456     FunctionInstance *function;
 457     DISPPARAMS args = {NULL,NULL,0,0};
 458     IDispatch *this_obj = NULL;
 459     DWORD argc;
 460     HRESULT hres;
 461
 462     TRACE("\n");
 463
 464     if(!(function = function_this(jsthis)))
 465         return throw_type_error(ctx, ei, JS_E_FUNCTION_EXPECTED, NULL);
 466
 467     argc = arg_cnt(dp);
 468     if(argc) {
 469         VARIANT *v = get_arg(dp,0);
 470
 471         if(V_VT(v) != VT_EMPTY && V_VT(v) != VT_NULL) {
 472             hres = to_object(ctx, v, &this_obj);
 473             if(FAILED(hres))
 474                 return hres;
 475         }
 476
 477         args.cArgs = argc-1;
 478     }
 479
 480     if(args.cArgs)
 481         args.rgvarg = dp->rgvarg + dp->cArgs - args.cArgs-1;
 482
 483     hres = call_function(ctx, function, this_obj, &args, retv, ei);
 484
 485     if(this_obj)
 486         IDispatch_Release(this_obj);
 487     return hres;
 488 }
 489
 490 HRESULT Function_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 491         VARIANT *retv, jsexcept_t *ei)
 492 {
 493     FunctionInstance *function;
 494
 495     TRACE("\n");
 496
 497     if(!is_vclass(jsthis, JSCLASS_FUNCTION)) {
 498         ERR("dispex is not a function\n");
 499         return E_FAIL;
 500     }
 501
 502     function = (FunctionInstance*)jsthis->u.jsdisp;
 503
 504     switch(flags) {
 505     case DISPATCH_METHOD:
 506         if(function->value_proc)
 507             return invoke_value_proc(ctx, function, get_this(dp), flags, dp, retv, ei);
 508
 509         return invoke_source(ctx, function, get_this(dp), dp, retv, ei);
 510
 511     case DISPATCH_PROPERTYGET: {
 512         HRESULT hres;
 513         BSTR str;
 514
 515         hres = function_to_string(function, &str);
 516         if(FAILED(hres))
 517             return hres;
 518
 519         V_VT(retv) = VT_BSTR;
 520         V_BSTR(retv) = str;
 521         break;
 522     }
 523
 524     case DISPATCH_CONSTRUCT:
 525         if(function->value_proc)
 526             return invoke_value_proc(ctx, function, get_this(dp), flags, dp, retv, ei);
 527
 528         return invoke_constructor(ctx, function, dp, retv, ei);
 529
 530     default:
 531         FIXME("not implemented flags %x\n", flags);
 532         return E_NOTIMPL;
 533     }
 534
 535     return S_OK;
 536 }
 537
 538 static HRESULT Function_arguments(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags,
 539         DISPPARAMS *dp, VARIANT *retv, jsexcept_t *ei)
 540 {
 541     FunctionInstance *function = (FunctionInstance*)jsthis->u.jsdisp;
 542     HRESULT hres = S_OK;
 543
 544     TRACE("\n");
 545
 546     switch(flags) {
 547     case DISPATCH_PROPERTYGET: {
 548         if(function->arguments) {
 549             jsdisp_addref(function->arguments);
 550             var_set_jsdisp(retv, function->arguments);
 551         }else {
 552             V_VT(retv) = VT_NULL;
 553         }
 554         break;
 555     }
 556     case DISPATCH_PROPERTYPUT:
 557         break;
 558     default:
 559         FIXME("unimplemented flags %x\n", flags);
 560         hres = E_NOTIMPL;
 561     }
 562
 563     return hres;
 564 }
 565
 566 static void Function_destructor(jsdisp_t *dispex)
 567 {
 568     FunctionInstance *This = (FunctionInstance*)dispex;
 569
 570     if(This->code)
 571         release_bytecode(This->code);
 572     if(This->scope_chain)
 573         scope_release(This->scope_chain);
 574     heap_free(This);
 575 }
 576
 577 static const builtin_prop_t Function_props[] = {
 578     {applyW,                 Function_apply,                 PROPF_METHOD|2},
 579     {argumentsW,             Function_arguments,             0},
 580     {callW,                  Function_call,                  PROPF_METHOD|1},
 581     {lengthW,                Function_length,                0},
 582     {toStringW,              Function_toString,              PROPF_METHOD}
 583 };
 584
 585 static const builtin_info_t Function_info = {
 586     JSCLASS_FUNCTION,
 587     {NULL, Function_value, 0},
 588     sizeof(Function_props)/sizeof(*Function_props),
 589     Function_props,
 590     Function_destructor,
 591     NULL
 592 };
 593
 594 static HRESULT create_function(script_ctx_t *ctx, const builtin_info_t *builtin_info, DWORD flags,
 595         BOOL funcprot, jsdisp_t *prototype, FunctionInstance **ret)
 596 {
 597     FunctionInstance *function;
 598     HRESULT hres;
 599
 600     function = heap_alloc_zero(sizeof(FunctionInstance));
 601     if(!function)
 602         return E_OUTOFMEMORY;
 603
 604     if(funcprot)
 605         hres = init_dispex(&function->dispex, ctx, &Function_info, prototype);
 606     else if(builtin_info)
 607         hres = init_dispex_from_constr(&function->dispex, ctx, builtin_info, ctx->function_constr);
 608     else
 609         hres = init_dispex_from_constr(&function->dispex, ctx, &Function_info, ctx->function_constr);
 610     if(FAILED(hres))
 611         return hres;
 612
 613     function->flags = flags;
 614     function->length = flags & PROPF_ARGMASK;
 615
 616     *ret = function;
 617     return S_OK;
 618 }
 619
 620 static HRESULT set_prototype(script_ctx_t *ctx, jsdisp_t *dispex, jsdisp_t *prototype)
 621 {
 622     jsexcept_t jsexcept;
 623     VARIANT var;
 624
 625     var_set_jsdisp(&var, prototype);
 626     memset(&jsexcept, 0, sizeof(jsexcept));
 627
 628     return jsdisp_propput_name(dispex, prototypeW, &var, &jsexcept);
 629 }
 630
 631 HRESULT create_builtin_function(script_ctx_t *ctx, builtin_invoke_t value_proc, const WCHAR *name,
 632         const builtin_info_t *builtin_info, DWORD flags, jsdisp_t *prototype, jsdisp_t **ret)
 633 {
 634     FunctionInstance *function;
 635     HRESULT hres;
 636
 637     hres = create_function(ctx, builtin_info, flags, FALSE, NULL, &function);
 638     if(FAILED(hres))
 639         return hres;
 640
 641     if(builtin_info) {
 642         VARIANT var;
 643
 644         V_VT(&var) = VT_I4;
 645         V_I4(&var) = function->length;
 646         hres = jsdisp_propput_const(&function->dispex, lengthW, &var);
 647     }
 648
 649     if(SUCCEEDED(hres))
 650         hres = set_prototype(ctx, &function->dispex, prototype);
 651     if(FAILED(hres)) {
 652         jsdisp_release(&function->dispex);
 653         return hres;
 654     }
 655
 656     function->value_proc = value_proc;
 657     function->name = name;
 658
 659     *ret = &function->dispex;
 660     return S_OK;
 661 }
 662
 663 HRESULT create_source_function(script_ctx_t *ctx, bytecode_t *code, parameter_t *parameters, source_elements_t *source,
 664         scope_chain_t *scope_chain, const WCHAR *src_str, DWORD src_len, jsdisp_t **ret)
 665 {
 666     FunctionInstance *function;
 667     jsdisp_t *prototype;
 668     parameter_t *iter;
 669     DWORD length = 0;
 670     HRESULT hres;
 671
 672     hres = create_object(ctx, NULL, &prototype);
 673     if(FAILED(hres))
 674         return hres;
 675
 676     hres = create_function(ctx, NULL, PROPF_CONSTR, FALSE, NULL, &function);
 677     if(SUCCEEDED(hres)) {
 678         hres = set_prototype(ctx, &function->dispex, prototype);
 679         if(FAILED(hres))
 680             jsdisp_release(&function->dispex);
 681     }
 682     jsdisp_release(prototype);
 683     if(FAILED(hres))
 684         return hres;
 685
 686     function->source = source;
 687     function->parameters = parameters;
 688
 689     if(scope_chain) {
 690         scope_addref(scope_chain);
 691         function->scope_chain = scope_chain;
 692     }
 693
 694     bytecode_addref(code);
 695     function->code = code;
 696
 697     for(iter = parameters; iter; iter = iter->next)
 698         length++;
 699     function->length = length;
 700
 701     function->src_str = src_str;
 702     function->src_len = src_len;
 703
 704     *ret = &function->dispex;
 705     return S_OK;
 706 }
 707
 708 static HRESULT construct_function(script_ctx_t *ctx, DISPPARAMS *dp, jsexcept_t *ei, IDispatch **ret)
 709 {
 710     function_expression_t *expr;
 711     WCHAR *str = NULL, *ptr;
 712     DWORD argc, len = 0, l;
 713     parser_ctx_t *parser;
 714     bytecode_t *code;
 715     jsdisp_t *function;
 716     BSTR *params = NULL;
 717     int i=0, j=0;
 718     HRESULT hres = S_OK;
 719
 720     static const WCHAR function_anonymousW[] = {'f','u','n','c','t','i','o','n',' ','a','n','o','n','y','m','o','u','s','('};
 721     static const WCHAR function_beginW[] = {')',' ','{','\n'};
 722     static const WCHAR function_endW[] = {'\n','}',0};
 723
 724     argc = arg_cnt(dp);
 725     if(argc) {
 726         params = heap_alloc(argc*sizeof(BSTR));
 727         if(!params)
 728             return E_OUTOFMEMORY;
 729
 730         if(argc > 2)
 731             len = (argc-2)*2; /* separating commas */
 732         for(i=0; i < argc; i++) {
 733             hres = to_string(ctx, get_arg(dp,i), ei, params+i);
 734             if(FAILED(hres))
 735                 break;
 736             len += SysStringLen(params[i]);
 737         }
 738     }
 739
 740     if(SUCCEEDED(hres)) {
 741         len += (sizeof(function_anonymousW) + sizeof(function_beginW) + sizeof(function_endW)) / sizeof(WCHAR);
 742         str = heap_alloc(len*sizeof(WCHAR));
 743         if(str) {
 744             memcpy(str, function_anonymousW, sizeof(function_anonymousW));
 745             ptr = str + sizeof(function_anonymousW)/sizeof(WCHAR);
 746             if(argc > 1) {
 747                 while(1) {
 748                     l = SysStringLen(params[j]);
 749                     memcpy(ptr, params[j], l*sizeof(WCHAR));
 750                     ptr += l;
 751                     if(++j == argc-1)
 752                         break;
 753                     *ptr++ = ',';
 754                     *ptr++ = ' ';
 755                 }
 756             }
 757             memcpy(ptr, function_beginW, sizeof(function_beginW));
 758             ptr += sizeof(function_beginW)/sizeof(WCHAR);
 759             if(argc) {
 760                 l = SysStringLen(params[argc-1]);
 761                 memcpy(ptr, params[argc-1], l*sizeof(WCHAR));
 762                 ptr += l;
 763             }
 764             memcpy(ptr, function_endW, sizeof(function_endW));
 765
 766             TRACE("%s\n", debugstr_w(str));
 767         }else {
 768             hres = E_OUTOFMEMORY;
 769         }
 770     }
 771
 772     while(--i >= 0)
 773         SysFreeString(params[i]);
 774     heap_free(params);
 775     if(FAILED(hres))
 776         return hres;
 777
 778     hres = compile_script(ctx, str, NULL, FALSE, &code);
 779     heap_free(str);
 780     if(FAILED(hres))
 781         return hres;
 782
 783     parser = code->parser;
 784     if(!parser->source || !parser->source->functions || parser->source->functions->next || parser->source->variables) {
 785         ERR("Invalid parser result!\n");
 786         release_bytecode(code);
 787         return E_UNEXPECTED;
 788     }
 789     expr = parser->source->functions->expr;
 790
 791     hres = create_source_function(ctx, code, expr->parameter_list, expr->source_elements, NULL, expr->src_str,
 792             expr->src_len, &function);
 793     release_bytecode(code);
 794     if(FAILED(hres))
 795         return hres;
 796
 797     *ret = to_disp(function);
 798     return S_OK;
 799 }
 800
 801 static HRESULT FunctionConstr_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 802         VARIANT *retv, jsexcept_t *ei)
 803 {
 804     HRESULT hres;
 805
 806     TRACE("\n");
 807
 808     switch(flags) {
 809     case DISPATCH_CONSTRUCT: {
 810         IDispatch *ret;
 811
 812         hres = construct_function(ctx, dp, ei, &ret);
 813         if(FAILED(hres))
 814             return hres;
 815
 816         V_VT(retv) = VT_DISPATCH;
 817         V_DISPATCH(retv) = ret;
 818         break;
 819     }
 820     default:
 821         FIXME("unimplemented flags %x\n", flags);
 822         return E_NOTIMPL;
 823     }
 824
 825     return S_OK;
 826 }
 827
 828 static HRESULT FunctionProt_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 829         VARIANT *retv, jsexcept_t *ei)
 830 {
 831     FIXME("\n");
 832     return E_NOTIMPL;
 833 }
 834
 835 HRESULT init_function_constr(script_ctx_t *ctx, jsdisp_t *object_prototype)
 836 {
 837     FunctionInstance *prot, *constr;
 838     HRESULT hres;
 839
 840     static const WCHAR FunctionW[] = {'F','u','n','c','t','i','o','n',0};
 841
 842     hres = create_function(ctx, NULL, PROPF_CONSTR, TRUE, object_prototype, &prot);
 843     if(FAILED(hres))
 844         return hres;
 845
 846     prot->value_proc = FunctionProt_value;
 847     prot->name = prototypeW;
 848
 849     hres = create_function(ctx, NULL, PROPF_CONSTR|1, TRUE, &prot->dispex, &constr);
 850     if(SUCCEEDED(hres)) {
 851         constr->value_proc = FunctionConstr_value;
 852         constr->name = FunctionW;
 853         hres = set_prototype(ctx, &constr->dispex, &prot->dispex);
 854         if(FAILED(hres))
 855             jsdisp_release(&constr->dispex);
 856     }
 857     jsdisp_release(&prot->dispex);
 858     if(FAILED(hres))
 859         return hres;
 860
 861     ctx->function_constr = &constr->dispex;
 862     return S_OK;
 863 }