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     scope_chain_t *scope_chain;
  32     bytecode_t *code;
  33     function_code_t *func_code;
  34     DWORD length;
  35     jsdisp_t *arguments;
  36 } FunctionInstance;
  37
  38 static inline FunctionInstance *function_from_vdisp(vdisp_t *vdisp)
  39 {
  40     return (FunctionInstance*)vdisp->u.jsdisp;
  41 }
  42
  43 static inline FunctionInstance *function_this(vdisp_t *jsthis)
  44 {
  45     return is_vclass(jsthis, JSCLASS_FUNCTION) ? function_from_vdisp(jsthis) : NULL;
  46 }
  47
  48 static const WCHAR prototypeW[] = {'p','r','o','t','o','t', 'y', 'p','e',0};
  49
  50 static const WCHAR lengthW[] = {'l','e','n','g','t','h',0};
  51 static const WCHAR toStringW[] = {'t','o','S','t','r','i','n','g',0};
  52 static const WCHAR applyW[] = {'a','p','p','l','y',0};
  53 static const WCHAR callW[] = {'c','a','l','l',0};
  54 static const WCHAR argumentsW[] = {'a','r','g','u','m','e','n','t','s',0};
  55
  56 static IDispatch *get_this(DISPPARAMS *dp)
  57 {
  58     DWORD i;
  59
  60     for(i=0; i < dp->cNamedArgs; i++) {
  61         if(dp->rgdispidNamedArgs[i] == DISPID_THIS) {
  62             if(V_VT(dp->rgvarg+i) == VT_DISPATCH)
  63                 return V_DISPATCH(dp->rgvarg+i);
  64
  65             WARN("This is not VT_DISPATCH\n");
  66             return NULL;
  67         }
  68     }
  69
  70     TRACE("no this passed\n");
  71     return NULL;
  72 }
  73
  74 static HRESULT init_parameters(jsdisp_t *var_disp, FunctionInstance *function, DISPPARAMS *dp,
  75         jsexcept_t *ei)
  76 {
  77     VARIANT var_empty;
  78     DWORD cargs, i=0;
  79     HRESULT hres;
  80
  81     V_VT(&var_empty) = VT_EMPTY;
  82     cargs = arg_cnt(dp);
  83
  84     for(i=0; i < function->func_code->param_cnt; i++) {
  85         hres = jsdisp_propput_name(var_disp, function->func_code->params[i],
  86                 i < cargs ? get_arg(dp,i) : &var_empty, ei);
  87         if(FAILED(hres))
  88             return hres;
  89     }
  90
  91     return S_OK;
  92 }
  93
  94 static HRESULT Arguments_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
  95         VARIANT *retv, jsexcept_t *ei)
  96 {
  97     FIXME("\n");
  98     return E_NOTIMPL;
  99 }
 100
 101 static const builtin_info_t Arguments_info = {
 102     JSCLASS_ARGUMENTS,
 103     {NULL, Arguments_value, 0},
 104     0, NULL,
 105     NULL,
 106     NULL
 107 };
 108
 109 static HRESULT create_arguments(script_ctx_t *ctx, IDispatch *calee, DISPPARAMS *dp,
 110         jsexcept_t *ei, jsdisp_t **ret)
 111 {
 112     jsdisp_t *args;
 113     VARIANT var;
 114     DWORD i;
 115     HRESULT hres;
 116
 117     static const WCHAR caleeW[] = {'c','a','l','l','e','e',0};
 118
 119     args = heap_alloc_zero(sizeof(jsdisp_t));
 120     if(!args)
 121         return E_OUTOFMEMORY;
 122
 123     hres = init_dispex_from_constr(args, ctx, &Arguments_info, ctx->object_constr);
 124     if(FAILED(hres)) {
 125         heap_free(args);
 126         return hres;
 127     }
 128
 129     for(i=0; i < arg_cnt(dp); i++) {
 130         hres = jsdisp_propput_idx(args, i, get_arg(dp,i), ei);
 131         if(FAILED(hres))
 132             break;
 133     }
 134
 135     if(SUCCEEDED(hres)) {
 136         V_VT(&var) = VT_I4;
 137         V_I4(&var) = arg_cnt(dp);
 138         hres = jsdisp_propput_name(args, lengthW, &var, ei);
 139
 140         if(SUCCEEDED(hres)) {
 141             V_VT(&var) = VT_DISPATCH;
 142             V_DISPATCH(&var) = calee;
 143             hres = jsdisp_propput_name(args, caleeW, &var, ei);
 144         }
 145     }
 146
 147     if(FAILED(hres)) {
 148         jsdisp_release(args);
 149         return hres;
 150     }
 151
 152     *ret = args;
 153     return S_OK;
 154 }
 155
 156 static HRESULT create_var_disp(script_ctx_t *ctx, FunctionInstance *function, jsdisp_t *arg_disp,
 157         DISPPARAMS *dp, jsexcept_t *ei, jsdisp_t **ret)
 158 {
 159     jsdisp_t *var_disp;
 160     VARIANT var;
 161     HRESULT hres;
 162
 163     hres = create_dispex(ctx, NULL, NULL, &var_disp);
 164     if(FAILED(hres))
 165         return hres;
 166
 167     var_set_jsdisp(&var, arg_disp);
 168     hres = jsdisp_propput_name(var_disp, argumentsW, &var, ei);
 169     if(SUCCEEDED(hres))
 170         hres = init_parameters(var_disp, function, dp, ei);
 171     if(FAILED(hres)) {
 172         jsdisp_release(var_disp);
 173         return hres;
 174     }
 175
 176     *ret = var_disp;
 177     return S_OK;
 178 }
 179
 180 static HRESULT invoke_source(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_obj, DISPPARAMS *dp,
 181         VARIANT *retv, jsexcept_t *ei)
 182 {
 183     jsdisp_t *var_disp, *arg_disp;
 184     exec_ctx_t *exec_ctx;
 185     scope_chain_t *scope;
 186     HRESULT hres;
 187
 188     if(!function->func_code) {
 189         FIXME("no source\n");
 190         return E_FAIL;
 191     }
 192
 193     hres = create_arguments(ctx, to_disp(&function->dispex), dp, ei, &arg_disp);
 194     if(FAILED(hres))
 195         return hres;
 196
 197     hres = create_var_disp(ctx, function, arg_disp, dp, ei, &var_disp);
 198     if(FAILED(hres)) {
 199         jsdisp_release(arg_disp);
 200         return hres;
 201     }
 202
 203     hres = scope_push(function->scope_chain, var_disp, &scope);
 204     if(SUCCEEDED(hres)) {
 205         hres = create_exec_ctx(ctx, this_obj, var_disp, scope, FALSE, &exec_ctx);
 206         scope_release(scope);
 207     }
 208     jsdisp_release(var_disp);
 209     if(SUCCEEDED(hres)) {
 210         jsdisp_t *prev_args;
 211
 212         prev_args = function->arguments;
 213         function->arguments = arg_disp;
 214         hres = exec_source(exec_ctx, function->code, function->func_code, FALSE, ei, retv);
 215         function->arguments = prev_args;
 216
 217         jsdisp_release(arg_disp);
 218         exec_release(exec_ctx);
 219     }
 220
 221     return hres;
 222 }
 223
 224 static HRESULT invoke_constructor(script_ctx_t *ctx, FunctionInstance *function, DISPPARAMS *dp,
 225         VARIANT *retv, jsexcept_t *ei)
 226 {
 227     jsdisp_t *this_obj;
 228     VARIANT var;
 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, to_disp(this_obj), dp, &var, ei);
 236     if(FAILED(hres)) {
 237         jsdisp_release(this_obj);
 238         return hres;
 239     }
 240
 241     if(V_VT(&var) == VT_DISPATCH) {
 242         jsdisp_release(this_obj);
 243         V_VT(retv) = VT_DISPATCH;
 244         V_DISPATCH(retv) = V_DISPATCH(&var);
 245     }else {
 246         VariantClear(&var);
 247         var_set_jsdisp(retv, this_obj);
 248     }
 249     return S_OK;
 250 }
 251
 252 static HRESULT invoke_value_proc(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_disp, WORD flags, DISPPARAMS *dp,
 253         VARIANT *retv, jsexcept_t *ei)
 254 {
 255     vdisp_t vthis;
 256     HRESULT hres;
 257
 258     if(this_disp)
 259         set_disp(&vthis, this_disp);
 260     else if(ctx->host_global)
 261         set_disp(&vthis, ctx->host_global);
 262     else
 263         set_jsdisp(&vthis, ctx->global);
 264
 265     hres = function->value_proc(ctx, &vthis, flags, dp, retv, ei);
 266
 267     vdisp_release(&vthis);
 268     return hres;
 269 }
 270
 271 static HRESULT call_function(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_obj, DISPPARAMS *args,
 272         VARIANT *retv, jsexcept_t *ei)
 273 {
 274     if(function->value_proc)
 275         return invoke_value_proc(ctx, function, this_obj, DISPATCH_METHOD, args, retv, ei);
 276
 277     return invoke_source(ctx, function, this_obj, args, retv, ei);
 278 }
 279
 280 static HRESULT function_to_string(FunctionInstance *function, BSTR *ret)
 281 {
 282     BSTR str;
 283
 284     static const WCHAR native_prefixW[] = {'\n','f','u','n','c','t','i','o','n',' '};
 285     static const WCHAR native_suffixW[] =
 286         {'(',')',' ','{','\n',' ',' ',' ',' ','[','n','a','t','i','v','e',' ','c','o','d','e',']','\n','}','\n'};
 287
 288     if(function->value_proc) {
 289         DWORD name_len;
 290
 291         name_len = strlenW(function->name);
 292         str = SysAllocStringLen(NULL, sizeof(native_prefixW) + name_len*sizeof(WCHAR) + sizeof(native_suffixW));
 293         if(!str)
 294             return E_OUTOFMEMORY;
 295
 296         memcpy(str, native_prefixW, sizeof(native_prefixW));
 297         memcpy(str + sizeof(native_prefixW)/sizeof(WCHAR), function->name, name_len*sizeof(WCHAR));
 298         memcpy(str + sizeof(native_prefixW)/sizeof(WCHAR) + name_len, native_suffixW, sizeof(native_suffixW));
 299     }else {
 300         str = SysAllocStringLen(function->func_code->source, function->func_code->source_len);
 301         if(!str)
 302             return E_OUTOFMEMORY;
 303     }
 304
 305     *ret = str;
 306     return S_OK;
 307 }
 308
 309 static HRESULT Function_length(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 310         VARIANT *retv, jsexcept_t *ei)
 311 {
 312     FunctionInstance *This = function_from_vdisp(jsthis);
 313
 314     TRACE("%p %d\n", This, This->length);
 315
 316     switch(flags) {
 317     case DISPATCH_PROPERTYGET:
 318         V_VT(retv) = VT_I4;
 319         V_I4(retv) = This->length;
 320         break;
 321     default:
 322         FIXME("unimplemented flags %x\n", flags);
 323         return E_NOTIMPL;
 324     }
 325
 326     return S_OK;
 327 }
 328
 329 static HRESULT Function_toString(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 330         VARIANT *retv, jsexcept_t *ei)
 331 {
 332     FunctionInstance *function;
 333     BSTR str;
 334     HRESULT hres;
 335
 336     TRACE("\n");
 337
 338     if(!(function = function_this(jsthis)))
 339         return throw_type_error(ctx, ei, JS_E_FUNCTION_EXPECTED, NULL);
 340
 341     hres = function_to_string(function, &str);
 342     if(FAILED(hres))
 343         return hres;
 344
 345     if(retv) {
 346         V_VT(retv) = VT_BSTR;
 347         V_BSTR(retv) = str;
 348     }else {
 349         SysFreeString(str);
 350     }
 351     return S_OK;
 352 }
 353
 354 static HRESULT array_to_args(script_ctx_t *ctx, jsdisp_t *arg_array, jsexcept_t *ei, DISPPARAMS *args)
 355 {
 356     VARIANT var, *argv;
 357     DWORD length, i;
 358     HRESULT hres;
 359
 360     hres = jsdisp_propget_name(arg_array, lengthW, &var, ei);
 361     if(FAILED(hres))
 362         return hres;
 363
 364     hres = to_uint32(ctx, &var, ei, &length);
 365     VariantClear(&var);
 366     if(FAILED(hres))
 367         return hres;
 368
 369     argv = heap_alloc(length * sizeof(VARIANT));
 370     if(!argv)
 371         return E_OUTOFMEMORY;
 372
 373     for(i=0; i<length; i++) {
 374         hres = jsdisp_get_idx(arg_array, i, argv+i, ei);
 375         if(hres == DISP_E_UNKNOWNNAME)
 376             V_VT(argv+i) = VT_EMPTY;
 377         else 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)
 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, JS_E_FUNCTION_EXPECTED, 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         jsdisp_t *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, &args);
 429             jsdisp_release(arg_array);
 430         }else {
 431             FIXME("throw TypeError\n");
 432             hres = E_FAIL;
 433         }
 434     }
 435
 436     if(SUCCEEDED(hres))
 437        hres = call_function(ctx, function, this_obj, &args, retv, ei);
 438
 439     if(this_obj)
 440         IDispatch_Release(this_obj);
 441     for(i=0; i<args.cArgs; i++)
 442         VariantClear(args.rgvarg+i);
 443     heap_free(args.rgvarg);
 444     return hres;
 445 }
 446
 447 static HRESULT Function_call(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 448         VARIANT *retv, jsexcept_t *ei)
 449 {
 450     FunctionInstance *function;
 451     DISPPARAMS args = {NULL,NULL,0,0};
 452     IDispatch *this_obj = NULL;
 453     DWORD argc;
 454     HRESULT hres;
 455
 456     TRACE("\n");
 457
 458     if(!(function = function_this(jsthis)))
 459         return throw_type_error(ctx, ei, JS_E_FUNCTION_EXPECTED, NULL);
 460
 461     argc = arg_cnt(dp);
 462     if(argc) {
 463         VARIANT *v = get_arg(dp,0);
 464
 465         if(V_VT(v) != VT_EMPTY && V_VT(v) != VT_NULL) {
 466             hres = to_object(ctx, v, &this_obj);
 467             if(FAILED(hres))
 468                 return hres;
 469         }
 470
 471         args.cArgs = argc-1;
 472     }
 473
 474     if(args.cArgs)
 475         args.rgvarg = dp->rgvarg + dp->cArgs - args.cArgs-1;
 476
 477     hres = call_function(ctx, function, this_obj, &args, retv, ei);
 478
 479     if(this_obj)
 480         IDispatch_Release(this_obj);
 481     return hres;
 482 }
 483
 484 HRESULT Function_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 485         VARIANT *retv, jsexcept_t *ei)
 486 {
 487     FunctionInstance *function;
 488
 489     TRACE("\n");
 490
 491     if(!is_vclass(jsthis, JSCLASS_FUNCTION)) {
 492         ERR("dispex is not a function\n");
 493         return E_FAIL;
 494     }
 495
 496     function = (FunctionInstance*)jsthis->u.jsdisp;
 497
 498     switch(flags) {
 499     case DISPATCH_METHOD:
 500         if(function->value_proc)
 501             return invoke_value_proc(ctx, function, get_this(dp), flags, dp, retv, ei);
 502
 503         return invoke_source(ctx, function, get_this(dp), dp, retv, ei);
 504
 505     case DISPATCH_PROPERTYGET: {
 506         HRESULT hres;
 507         BSTR str;
 508
 509         hres = function_to_string(function, &str);
 510         if(FAILED(hres))
 511             return hres;
 512
 513         V_VT(retv) = VT_BSTR;
 514         V_BSTR(retv) = str;
 515         break;
 516     }
 517
 518     case DISPATCH_CONSTRUCT:
 519         if(function->value_proc)
 520             return invoke_value_proc(ctx, function, get_this(dp), flags, dp, retv, ei);
 521
 522         return invoke_constructor(ctx, function, dp, retv, ei);
 523
 524     default:
 525         FIXME("not implemented flags %x\n", flags);
 526         return E_NOTIMPL;
 527     }
 528
 529     return S_OK;
 530 }
 531
 532 static HRESULT Function_arguments(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags,
 533         DISPPARAMS *dp, VARIANT *retv, jsexcept_t *ei)
 534 {
 535     FunctionInstance *function = (FunctionInstance*)jsthis->u.jsdisp;
 536     HRESULT hres = S_OK;
 537
 538     TRACE("\n");
 539
 540     switch(flags) {
 541     case DISPATCH_PROPERTYGET: {
 542         if(function->arguments) {
 543             jsdisp_addref(function->arguments);
 544             var_set_jsdisp(retv, function->arguments);
 545         }else {
 546             V_VT(retv) = VT_NULL;
 547         }
 548         break;
 549     }
 550     case DISPATCH_PROPERTYPUT:
 551         break;
 552     default:
 553         FIXME("unimplemented flags %x\n", flags);
 554         hres = E_NOTIMPL;
 555     }
 556
 557     return hres;
 558 }
 559
 560 static void Function_destructor(jsdisp_t *dispex)
 561 {
 562     FunctionInstance *This = (FunctionInstance*)dispex;
 563
 564     if(This->code)
 565         release_bytecode(This->code);
 566     if(This->scope_chain)
 567         scope_release(This->scope_chain);
 568     heap_free(This);
 569 }
 570
 571 static const builtin_prop_t Function_props[] = {
 572     {applyW,                 Function_apply,                 PROPF_METHOD|2},
 573     {argumentsW,             Function_arguments,             0},
 574     {callW,                  Function_call,                  PROPF_METHOD|1},
 575     {lengthW,                Function_length,                0},
 576     {toStringW,              Function_toString,              PROPF_METHOD}
 577 };
 578
 579 static const builtin_info_t Function_info = {
 580     JSCLASS_FUNCTION,
 581     {NULL, Function_value, 0},
 582     sizeof(Function_props)/sizeof(*Function_props),
 583     Function_props,
 584     Function_destructor,
 585     NULL
 586 };
 587
 588 static HRESULT create_function(script_ctx_t *ctx, const builtin_info_t *builtin_info, DWORD flags,
 589         BOOL funcprot, jsdisp_t *prototype, FunctionInstance **ret)
 590 {
 591     FunctionInstance *function;
 592     HRESULT hres;
 593
 594     function = heap_alloc_zero(sizeof(FunctionInstance));
 595     if(!function)
 596         return E_OUTOFMEMORY;
 597
 598     if(funcprot)
 599         hres = init_dispex(&function->dispex, ctx, &Function_info, prototype);
 600     else if(builtin_info)
 601         hres = init_dispex_from_constr(&function->dispex, ctx, builtin_info, ctx->function_constr);
 602     else
 603         hres = init_dispex_from_constr(&function->dispex, ctx, &Function_info, ctx->function_constr);
 604     if(FAILED(hres))
 605         return hres;
 606
 607     function->flags = flags;
 608     function->length = flags & PROPF_ARGMASK;
 609
 610     *ret = function;
 611     return S_OK;
 612 }
 613
 614 static HRESULT set_prototype(script_ctx_t *ctx, jsdisp_t *dispex, jsdisp_t *prototype)
 615 {
 616     jsexcept_t jsexcept;
 617     VARIANT var;
 618
 619     var_set_jsdisp(&var, prototype);
 620     memset(&jsexcept, 0, sizeof(jsexcept));
 621
 622     return jsdisp_propput_name(dispex, prototypeW, &var, &jsexcept);
 623 }
 624
 625 HRESULT create_builtin_function(script_ctx_t *ctx, builtin_invoke_t value_proc, const WCHAR *name,
 626         const builtin_info_t *builtin_info, DWORD flags, jsdisp_t *prototype, jsdisp_t **ret)
 627 {
 628     FunctionInstance *function;
 629     HRESULT hres;
 630
 631     hres = create_function(ctx, builtin_info, flags, FALSE, NULL, &function);
 632     if(FAILED(hres))
 633         return hres;
 634
 635     if(builtin_info) {
 636         VARIANT var;
 637
 638         V_VT(&var) = VT_I4;
 639         V_I4(&var) = function->length;
 640         hres = jsdisp_propput_const(&function->dispex, lengthW, &var);
 641     }
 642
 643     if(SUCCEEDED(hres))
 644         hres = set_prototype(ctx, &function->dispex, prototype);
 645     if(FAILED(hres)) {
 646         jsdisp_release(&function->dispex);
 647         return hres;
 648     }
 649
 650     function->value_proc = value_proc;
 651     function->name = name;
 652
 653     *ret = &function->dispex;
 654     return S_OK;
 655 }
 656
 657 HRESULT create_source_function(script_ctx_t *ctx, bytecode_t *code, function_code_t *func_code,
 658         scope_chain_t *scope_chain, jsdisp_t **ret)
 659 {
 660     FunctionInstance *function;
 661     jsdisp_t *prototype;
 662     HRESULT hres;
 663
 664     hres = create_object(ctx, NULL, &prototype);
 665     if(FAILED(hres))
 666         return hres;
 667
 668     hres = create_function(ctx, NULL, PROPF_CONSTR, FALSE, NULL, &function);
 669     if(SUCCEEDED(hres)) {
 670         hres = set_prototype(ctx, &function->dispex, prototype);
 671         if(FAILED(hres))
 672             jsdisp_release(&function->dispex);
 673     }
 674     jsdisp_release(prototype);
 675     if(FAILED(hres))
 676         return hres;
 677
 678     if(scope_chain) {
 679         scope_addref(scope_chain);
 680         function->scope_chain = scope_chain;
 681     }
 682
 683     bytecode_addref(code);
 684     function->code = code;
 685     function->func_code = func_code;
 686     function->length = function->func_code->param_cnt;
 687
 688     *ret = &function->dispex;
 689     return S_OK;
 690 }
 691
 692 static HRESULT construct_function(script_ctx_t *ctx, DISPPARAMS *dp, jsexcept_t *ei, IDispatch **ret)
 693 {
 694     WCHAR *str = NULL, *ptr;
 695     DWORD argc, len = 0, l;
 696     bytecode_t *code;
 697     jsdisp_t *function;
 698     BSTR *params = NULL;
 699     int i=0, j=0;
 700     HRESULT hres = S_OK;
 701
 702     static const WCHAR function_anonymousW[] = {'f','u','n','c','t','i','o','n',' ','a','n','o','n','y','m','o','u','s','('};
 703     static const WCHAR function_beginW[] = {')',' ','{','\n'};
 704     static const WCHAR function_endW[] = {'\n','}',0};
 705
 706     argc = arg_cnt(dp);
 707     if(argc) {
 708         params = heap_alloc(argc*sizeof(BSTR));
 709         if(!params)
 710             return E_OUTOFMEMORY;
 711
 712         if(argc > 2)
 713             len = (argc-2)*2; /* separating commas */
 714         for(i=0; i < argc; i++) {
 715             hres = to_string(ctx, get_arg(dp,i), ei, params+i);
 716             if(FAILED(hres))
 717                 break;
 718             len += SysStringLen(params[i]);
 719         }
 720     }
 721
 722     if(SUCCEEDED(hres)) {
 723         len += (sizeof(function_anonymousW) + sizeof(function_beginW) + sizeof(function_endW)) / sizeof(WCHAR);
 724         str = heap_alloc(len*sizeof(WCHAR));
 725         if(str) {
 726             memcpy(str, function_anonymousW, sizeof(function_anonymousW));
 727             ptr = str + sizeof(function_anonymousW)/sizeof(WCHAR);
 728             if(argc > 1) {
 729                 while(1) {
 730                     l = SysStringLen(params[j]);
 731                     memcpy(ptr, params[j], l*sizeof(WCHAR));
 732                     ptr += l;
 733                     if(++j == argc-1)
 734                         break;
 735                     *ptr++ = ',';
 736                     *ptr++ = ' ';
 737                 }
 738             }
 739             memcpy(ptr, function_beginW, sizeof(function_beginW));
 740             ptr += sizeof(function_beginW)/sizeof(WCHAR);
 741             if(argc) {
 742                 l = SysStringLen(params[argc-1]);
 743                 memcpy(ptr, params[argc-1], l*sizeof(WCHAR));
 744                 ptr += l;
 745             }
 746             memcpy(ptr, function_endW, sizeof(function_endW));
 747
 748             TRACE("%s\n", debugstr_w(str));
 749         }else {
 750             hres = E_OUTOFMEMORY;
 751         }
 752     }
 753
 754     while(--i >= 0)
 755         SysFreeString(params[i]);
 756     heap_free(params);
 757     if(FAILED(hres))
 758         return hres;
 759
 760     hres = compile_script(ctx, str, NULL, FALSE, FALSE, &code);
 761     heap_free(str);
 762     if(FAILED(hres))
 763         return hres;
 764
 765     if(code->global_code.func_cnt != 1 || code->global_code.var_cnt) {
 766         ERR("Invalid parser result!\n");
 767         release_bytecode(code);
 768         return E_UNEXPECTED;
 769     }
 770
 771     hres = create_source_function(ctx, code, code->global_code.funcs, NULL, &function);
 772     release_bytecode(code);
 773     if(FAILED(hres))
 774         return hres;
 775
 776     *ret = to_disp(function);
 777     return S_OK;
 778 }
 779
 780 static HRESULT FunctionConstr_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 781         VARIANT *retv, jsexcept_t *ei)
 782 {
 783     HRESULT hres;
 784
 785     TRACE("\n");
 786
 787     switch(flags) {
 788     case DISPATCH_CONSTRUCT: {
 789         IDispatch *ret;
 790
 791         hres = construct_function(ctx, dp, ei, &ret);
 792         if(FAILED(hres))
 793             return hres;
 794
 795         V_VT(retv) = VT_DISPATCH;
 796         V_DISPATCH(retv) = ret;
 797         break;
 798     }
 799     default:
 800         FIXME("unimplemented flags %x\n", flags);
 801         return E_NOTIMPL;
 802     }
 803
 804     return S_OK;
 805 }
 806
 807 static HRESULT FunctionProt_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 808         VARIANT *retv, jsexcept_t *ei)
 809 {
 810     FIXME("\n");
 811     return E_NOTIMPL;
 812 }
 813
 814 HRESULT init_function_constr(script_ctx_t *ctx, jsdisp_t *object_prototype)
 815 {
 816     FunctionInstance *prot, *constr;
 817     HRESULT hres;
 818
 819     static const WCHAR FunctionW[] = {'F','u','n','c','t','i','o','n',0};
 820
 821     hres = create_function(ctx, NULL, PROPF_CONSTR, TRUE, object_prototype, &prot);
 822     if(FAILED(hres))
 823         return hres;
 824
 825     prot->value_proc = FunctionProt_value;
 826     prot->name = prototypeW;
 827
 828     hres = create_function(ctx, NULL, PROPF_CONSTR|1, TRUE, &prot->dispex, &constr);
 829     if(SUCCEEDED(hres)) {
 830         constr->value_proc = FunctionConstr_value;
 831         constr->name = FunctionW;
 832         hres = set_prototype(ctx, &constr->dispex, &prot->dispex);
 833         if(FAILED(hres))
 834             jsdisp_release(&constr->dispex);
 835     }
 836     jsdisp_release(&prot->dispex);
 837     if(FAILED(hres))
 838         return hres;
 839
 840     ctx->function_constr = &constr->dispex;
 841     return S_OK;
 842 }