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 <assert.h>
  20
  21 #include "jscript.h"
  22 #include "engine.h"
  23
  24 #include "wine/debug.h"
  25
  26 WINE_DEFAULT_DEBUG_CHANNEL(jscript);
  27
  28 typedef struct {
  29     jsdisp_t dispex;
  30     builtin_invoke_t value_proc;
  31     const WCHAR *name;
  32     DWORD flags;
  33     scope_chain_t *scope_chain;
  34     bytecode_t *code;
  35     function_code_t *func_code;
  36     DWORD length;
  37     jsdisp_t *arguments;
  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 static const WCHAR argumentsW[] = {'a','r','g','u','m','e','n','t','s',0};
  57
  58 static IDispatch *get_this(DISPPARAMS *dp)
  59 {
  60     DWORD i;
  61
  62     for(i=0; i < dp->cNamedArgs; i++) {
  63         if(dp->rgdispidNamedArgs[i] == DISPID_THIS) {
  64             if(V_VT(dp->rgvarg+i) == VT_DISPATCH)
  65                 return V_DISPATCH(dp->rgvarg+i);
  66
  67             WARN("This is not VT_DISPATCH\n");
  68             return NULL;
  69         }
  70     }
  71
  72     TRACE("no this passed\n");
  73     return NULL;
  74 }
  75
  76 static HRESULT init_parameters(jsdisp_t *var_disp, FunctionInstance *function, DISPPARAMS *dp,
  77         jsexcept_t *ei)
  78 {
  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(i=0; i < function->func_code->param_cnt; i++) {
  87         hres = jsdisp_propput_name(var_disp, function->func_code->params[i],
  88                 i < cargs ? get_arg(dp,i) : &var_empty, ei);
  89         if(FAILED(hres))
  90             return hres;
  91     }
  92
  93     return S_OK;
  94 }
  95
  96 static HRESULT Arguments_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
  97         VARIANT *retv, jsexcept_t *ei)
  98 {
  99     FIXME("\n");
 100     return E_NOTIMPL;
 101 }
 102
 103 static const builtin_info_t Arguments_info = {
 104     JSCLASS_ARGUMENTS,
 105     {NULL, Arguments_value, 0},
 106     0, NULL,
 107     NULL,
 108     NULL
 109 };
 110
 111 static HRESULT create_arguments(script_ctx_t *ctx, IDispatch *calee, DISPPARAMS *dp,
 112         jsexcept_t *ei, jsdisp_t **ret)
 113 {
 114     jsdisp_t *args;
 115     VARIANT var;
 116     DWORD i;
 117     HRESULT hres;
 118
 119     static const WCHAR caleeW[] = {'c','a','l','l','e','e',0};
 120
 121     args = heap_alloc_zero(sizeof(jsdisp_t));
 122     if(!args)
 123         return E_OUTOFMEMORY;
 124
 125     hres = init_dispex_from_constr(args, ctx, &Arguments_info, ctx->object_constr);
 126     if(FAILED(hres)) {
 127         heap_free(args);
 128         return hres;
 129     }
 130
 131     for(i=0; i < arg_cnt(dp); i++) {
 132         hres = jsdisp_propput_idx(args, i, get_arg(dp,i), ei);
 133         if(FAILED(hres))
 134             break;
 135     }
 136
 137     if(SUCCEEDED(hres)) {
 138         num_set_int(&var, arg_cnt(dp));
 139         hres = jsdisp_propput_name(args, lengthW, &var, ei);
 140
 141         if(SUCCEEDED(hres)) {
 142             V_VT(&var) = VT_DISPATCH;
 143             V_DISPATCH(&var) = calee;
 144             hres = jsdisp_propput_name(args, caleeW, &var, ei);
 145         }
 146     }
 147
 148     if(FAILED(hres)) {
 149         jsdisp_release(args);
 150         return hres;
 151     }
 152
 153     *ret = args;
 154     return S_OK;
 155 }
 156
 157 static HRESULT create_var_disp(script_ctx_t *ctx, FunctionInstance *function, jsdisp_t *arg_disp,
 158         DISPPARAMS *dp, jsexcept_t *ei, jsdisp_t **ret)
 159 {
 160     jsdisp_t *var_disp;
 161     VARIANT var;
 162     HRESULT hres;
 163
 164     hres = create_dispex(ctx, NULL, NULL, &var_disp);
 165     if(FAILED(hres))
 166         return hres;
 167
 168     var_set_jsdisp(&var, arg_disp);
 169     hres = jsdisp_propput_name(var_disp, argumentsW, &var, ei);
 170     if(SUCCEEDED(hres))
 171         hres = init_parameters(var_disp, function, dp, ei);
 172     if(FAILED(hres)) {
 173         jsdisp_release(var_disp);
 174         return hres;
 175     }
 176
 177     *ret = var_disp;
 178     return S_OK;
 179 }
 180
 181 static HRESULT invoke_source(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_obj, DISPPARAMS *dp,
 182         VARIANT *retv, jsexcept_t *ei)
 183 {
 184     jsdisp_t *var_disp, *arg_disp;
 185     exec_ctx_t *exec_ctx;
 186     scope_chain_t *scope;
 187     HRESULT hres;
 188
 189     if(!function->func_code) {
 190         FIXME("no source\n");
 191         return E_FAIL;
 192     }
 193
 194     hres = create_arguments(ctx, to_disp(&function->dispex), dp, ei, &arg_disp);
 195     if(FAILED(hres))
 196         return hres;
 197
 198     hres = create_var_disp(ctx, function, arg_disp, dp, ei, &var_disp);
 199     if(FAILED(hres)) {
 200         jsdisp_release(arg_disp);
 201         return hres;
 202     }
 203
 204     hres = scope_push(function->scope_chain, var_disp, &scope);
 205     if(SUCCEEDED(hres)) {
 206         hres = create_exec_ctx(ctx, this_obj, var_disp, scope, FALSE, &exec_ctx);
 207         scope_release(scope);
 208     }
 209     jsdisp_release(var_disp);
 210     if(SUCCEEDED(hres)) {
 211         jsdisp_t *prev_args;
 212
 213         prev_args = function->arguments;
 214         function->arguments = arg_disp;
 215         hres = exec_source(exec_ctx, function->code, function->func_code, FALSE, ei, retv);
 216         function->arguments = prev_args;
 217
 218         jsdisp_release(arg_disp);
 219         exec_release(exec_ctx);
 220     }
 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)
 227 {
 228     jsdisp_t *this_obj;
 229     VARIANT var;
 230     HRESULT hres;
 231
 232     hres = create_object(ctx, &function->dispex, &this_obj);
 233     if(FAILED(hres))
 234         return hres;
 235
 236     hres = invoke_source(ctx, function, to_disp(this_obj), dp, &var, ei);
 237     if(FAILED(hres)) {
 238         jsdisp_release(this_obj);
 239         return hres;
 240     }
 241
 242     if(V_VT(&var) == VT_DISPATCH) {
 243         jsdisp_release(this_obj);
 244         V_VT(retv) = VT_DISPATCH;
 245         V_DISPATCH(retv) = V_DISPATCH(&var);
 246     }else {
 247         VariantClear(&var);
 248         var_set_jsdisp(retv, this_obj);
 249     }
 250     return S_OK;
 251 }
 252
 253 static HRESULT invoke_value_proc(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_disp, WORD flags, DISPPARAMS *dp,
 254         VARIANT *retv, jsexcept_t *ei)
 255 {
 256     vdisp_t vthis;
 257     HRESULT hres;
 258
 259     if(this_disp)
 260         set_disp(&vthis, this_disp);
 261     else if(ctx->host_global)
 262         set_disp(&vthis, ctx->host_global);
 263     else
 264         set_jsdisp(&vthis, ctx->global);
 265
 266     hres = function->value_proc(ctx, &vthis, flags, dp, retv, ei);
 267
 268     vdisp_release(&vthis);
 269     return hres;
 270 }
 271
 272 static HRESULT call_function(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_obj, DISPPARAMS *args,
 273         VARIANT *retv, jsexcept_t *ei)
 274 {
 275     if(function->value_proc)
 276         return invoke_value_proc(ctx, function, this_obj, DISPATCH_METHOD, args, retv, ei);
 277
 278     return invoke_source(ctx, function, this_obj, args, retv, ei);
 279 }
 280
 281 static HRESULT function_to_string(FunctionInstance *function, BSTR *ret)
 282 {
 283     BSTR str;
 284
 285     static const WCHAR native_prefixW[] = {'\n','f','u','n','c','t','i','o','n',' '};
 286     static const WCHAR native_suffixW[] =
 287         {'(',')',' ','{','\n',' ',' ',' ',' ','[','n','a','t','i','v','e',' ','c','o','d','e',']','\n','}','\n'};
 288
 289     if(function->value_proc) {
 290         DWORD name_len;
 291
 292         name_len = strlenW(function->name);
 293         str = SysAllocStringLen(NULL, sizeof(native_prefixW) + name_len*sizeof(WCHAR) + sizeof(native_suffixW));
 294         if(!str)
 295             return E_OUTOFMEMORY;
 296
 297         memcpy(str, native_prefixW, sizeof(native_prefixW));
 298         memcpy(str + sizeof(native_prefixW)/sizeof(WCHAR), function->name, name_len*sizeof(WCHAR));
 299         memcpy(str + sizeof(native_prefixW)/sizeof(WCHAR) + name_len, native_suffixW, sizeof(native_suffixW));
 300     }else {
 301         str = SysAllocStringLen(function->func_code->source, function->func_code->source_len);
 302         if(!str)
 303             return E_OUTOFMEMORY;
 304     }
 305
 306     *ret = str;
 307     return S_OK;
 308 }
 309
 310 HRESULT Function_invoke(jsdisp_t *func_this, IDispatch *jsthis, WORD flags, DISPPARAMS *dp, VARIANT *retv, jsexcept_t *ei)
 311 {
 312     FunctionInstance *function;
 313
 314     TRACE("func %p this %p\n", func_this, jsthis);
 315
 316     assert(is_class(func_this, JSCLASS_FUNCTION));
 317     function = (FunctionInstance*)func_this;
 318
 319     if(function->value_proc)
 320         return invoke_value_proc(function->dispex.ctx, function, jsthis, flags, dp, retv, ei);
 321
 322     if(flags == DISPATCH_CONSTRUCT)
 323         return invoke_constructor(function->dispex.ctx, function, dp, retv, ei);
 324
 325     assert(flags == DISPATCH_METHOD);
 326     return invoke_source(function->dispex.ctx, function, jsthis, dp, retv, ei);
 327 }
 328
 329 static HRESULT Function_length(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 330         VARIANT *retv, jsexcept_t *ei)
 331 {
 332     FunctionInstance *This = function_from_vdisp(jsthis);
 333
 334     TRACE("%p %d\n", This, This->length);
 335
 336     switch(flags) {
 337     case DISPATCH_PROPERTYGET:
 338         num_set_int(retv, This->length);
 339         break;
 340     default:
 341         FIXME("unimplemented flags %x\n", flags);
 342         return E_NOTIMPL;
 343     }
 344
 345     return S_OK;
 346 }
 347
 348 static HRESULT Function_toString(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 349         VARIANT *retv, jsexcept_t *ei)
 350 {
 351     FunctionInstance *function;
 352     BSTR str;
 353     HRESULT hres;
 354
 355     TRACE("\n");
 356
 357     if(!(function = function_this(jsthis)))
 358         return throw_type_error(ctx, ei, JS_E_FUNCTION_EXPECTED, NULL);
 359
 360     hres = function_to_string(function, &str);
 361     if(FAILED(hres))
 362         return hres;
 363
 364     if(retv) {
 365         V_VT(retv) = VT_BSTR;
 366         V_BSTR(retv) = str;
 367     }else {
 368         SysFreeString(str);
 369     }
 370     return S_OK;
 371 }
 372
 373 static HRESULT array_to_args(script_ctx_t *ctx, jsdisp_t *arg_array, jsexcept_t *ei, DISPPARAMS *args)
 374 {
 375     VARIANT var, *argv;
 376     DWORD length, i;
 377     HRESULT hres;
 378
 379     hres = jsdisp_propget_name(arg_array, lengthW, &var, ei);
 380     if(FAILED(hres))
 381         return hres;
 382
 383     hres = to_uint32(ctx, &var, ei, &length);
 384     VariantClear(&var);
 385     if(FAILED(hres))
 386         return hres;
 387
 388     argv = heap_alloc(length * sizeof(VARIANT));
 389     if(!argv)
 390         return E_OUTOFMEMORY;
 391
 392     for(i=0; i<length; i++) {
 393         hres = jsdisp_get_idx(arg_array, i, argv+i, ei);
 394         if(hres == DISP_E_UNKNOWNNAME)
 395             V_VT(argv+i) = VT_EMPTY;
 396         else if(FAILED(hres)) {
 397             while(i--)
 398                 VariantClear(argv+i);
 399             heap_free(argv);
 400             return hres;
 401         }
 402     }
 403
 404     args->cArgs = length;
 405     args->rgvarg = argv;
 406     return S_OK;
 407 }
 408
 409 static HRESULT Function_apply(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 410         VARIANT *retv, jsexcept_t *ei)
 411 {
 412     FunctionInstance *function;
 413     DISPPARAMS args = {NULL,NULL,0,0};
 414     DWORD argc, i;
 415     IDispatch *this_obj = NULL;
 416     HRESULT hres = S_OK;
 417
 418     TRACE("\n");
 419
 420     if(!(function = function_this(jsthis)))
 421         return throw_type_error(ctx, ei, JS_E_FUNCTION_EXPECTED, NULL);
 422
 423     argc = arg_cnt(dp);
 424     if(argc) {
 425         VARIANT *v = get_arg(dp,0);
 426
 427         if(V_VT(v) != VT_EMPTY && V_VT(v) != VT_NULL) {
 428             hres = to_object(ctx, v, &this_obj);
 429             if(FAILED(hres))
 430                 return hres;
 431         }
 432     }
 433
 434     if(argc >= 2) {
 435         jsdisp_t *arg_array = NULL;
 436
 437         if(V_VT(get_arg(dp,1)) == VT_DISPATCH) {
 438             arg_array = iface_to_jsdisp((IUnknown*)V_DISPATCH(get_arg(dp,1)));
 439             if(arg_array &&
 440                (!is_class(arg_array, JSCLASS_ARRAY) && !is_class(arg_array, JSCLASS_ARGUMENTS) )) {
 441                 jsdisp_release(arg_array);
 442                 arg_array = NULL;
 443             }
 444         }
 445
 446         if(arg_array) {
 447             hres = array_to_args(ctx, arg_array, ei, &args);
 448             jsdisp_release(arg_array);
 449         }else {
 450             FIXME("throw TypeError\n");
 451             hres = E_FAIL;
 452         }
 453     }
 454
 455     if(SUCCEEDED(hres))
 456        hres = call_function(ctx, function, this_obj, &args, retv, ei);
 457
 458     if(this_obj)
 459         IDispatch_Release(this_obj);
 460     for(i=0; i<args.cArgs; i++)
 461         VariantClear(args.rgvarg+i);
 462     heap_free(args.rgvarg);
 463     return hres;
 464 }
 465
 466 static HRESULT Function_call(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 467         VARIANT *retv, jsexcept_t *ei)
 468 {
 469     FunctionInstance *function;
 470     DISPPARAMS args = {NULL,NULL,0,0};
 471     IDispatch *this_obj = NULL;
 472     DWORD argc;
 473     HRESULT hres;
 474
 475     TRACE("\n");
 476
 477     if(!(function = function_this(jsthis)))
 478         return throw_type_error(ctx, ei, JS_E_FUNCTION_EXPECTED, NULL);
 479
 480     argc = arg_cnt(dp);
 481     if(argc) {
 482         VARIANT *v = get_arg(dp,0);
 483
 484         if(V_VT(v) != VT_EMPTY && V_VT(v) != VT_NULL) {
 485             hres = to_object(ctx, v, &this_obj);
 486             if(FAILED(hres))
 487                 return hres;
 488         }
 489
 490         args.cArgs = argc-1;
 491     }
 492
 493     if(args.cArgs)
 494         args.rgvarg = dp->rgvarg + dp->cArgs - args.cArgs-1;
 495
 496     hres = call_function(ctx, function, this_obj, &args, retv, ei);
 497
 498     if(this_obj)
 499         IDispatch_Release(this_obj);
 500     return hres;
 501 }
 502
 503 HRESULT Function_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 504         VARIANT *retv, jsexcept_t *ei)
 505 {
 506     FunctionInstance *function;
 507
 508     TRACE("\n");
 509
 510     if(!is_vclass(jsthis, JSCLASS_FUNCTION)) {
 511         ERR("dispex is not a function\n");
 512         return E_FAIL;
 513     }
 514
 515     function = (FunctionInstance*)jsthis->u.jsdisp;
 516
 517     switch(flags) {
 518     case DISPATCH_METHOD:
 519         if(function->value_proc)
 520             return invoke_value_proc(ctx, function, get_this(dp), flags, dp, retv, ei);
 521
 522         return invoke_source(ctx, function, get_this(dp), dp, retv, ei);
 523
 524     case DISPATCH_PROPERTYGET: {
 525         HRESULT hres;
 526         BSTR str;
 527
 528         hres = function_to_string(function, &str);
 529         if(FAILED(hres))
 530             return hres;
 531
 532         V_VT(retv) = VT_BSTR;
 533         V_BSTR(retv) = str;
 534         break;
 535     }
 536
 537     case DISPATCH_CONSTRUCT:
 538         if(function->value_proc)
 539             return invoke_value_proc(ctx, function, get_this(dp), flags, dp, retv, ei);
 540
 541         return invoke_constructor(ctx, function, dp, retv, ei);
 542
 543     default:
 544         FIXME("not implemented flags %x\n", flags);
 545         return E_NOTIMPL;
 546     }
 547
 548     return S_OK;
 549 }
 550
 551 static HRESULT Function_arguments(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags,
 552         DISPPARAMS *dp, VARIANT *retv, jsexcept_t *ei)
 553 {
 554     FunctionInstance *function = (FunctionInstance*)jsthis->u.jsdisp;
 555     HRESULT hres = S_OK;
 556
 557     TRACE("\n");
 558
 559     switch(flags) {
 560     case DISPATCH_PROPERTYGET: {
 561         if(function->arguments) {
 562             jsdisp_addref(function->arguments);
 563             var_set_jsdisp(retv, function->arguments);
 564         }else {
 565             V_VT(retv) = VT_NULL;
 566         }
 567         break;
 568     }
 569     case DISPATCH_PROPERTYPUT:
 570         break;
 571     default:
 572         FIXME("unimplemented flags %x\n", flags);
 573         hres = E_NOTIMPL;
 574     }
 575
 576     return hres;
 577 }
 578
 579 static void Function_destructor(jsdisp_t *dispex)
 580 {
 581     FunctionInstance *This = (FunctionInstance*)dispex;
 582
 583     if(This->code)
 584         release_bytecode(This->code);
 585     if(This->scope_chain)
 586         scope_release(This->scope_chain);
 587     heap_free(This);
 588 }
 589
 590 static const builtin_prop_t Function_props[] = {
 591     {applyW,                 Function_apply,                 PROPF_METHOD|2},
 592     {argumentsW,             Function_arguments,             0},
 593     {callW,                  Function_call,                  PROPF_METHOD|1},
 594     {lengthW,                Function_length,                0},
 595     {toStringW,              Function_toString,              PROPF_METHOD}
 596 };
 597
 598 static const builtin_info_t Function_info = {
 599     JSCLASS_FUNCTION,
 600     {NULL, Function_value, 0},
 601     sizeof(Function_props)/sizeof(*Function_props),
 602     Function_props,
 603     Function_destructor,
 604     NULL
 605 };
 606
 607 static HRESULT create_function(script_ctx_t *ctx, const builtin_info_t *builtin_info, DWORD flags,
 608         BOOL funcprot, jsdisp_t *prototype, FunctionInstance **ret)
 609 {
 610     FunctionInstance *function;
 611     HRESULT hres;
 612
 613     function = heap_alloc_zero(sizeof(FunctionInstance));
 614     if(!function)
 615         return E_OUTOFMEMORY;
 616
 617     if(funcprot)
 618         hres = init_dispex(&function->dispex, ctx, &Function_info, prototype);
 619     else if(builtin_info)
 620         hres = init_dispex_from_constr(&function->dispex, ctx, builtin_info, ctx->function_constr);
 621     else
 622         hres = init_dispex_from_constr(&function->dispex, ctx, &Function_info, ctx->function_constr);
 623     if(FAILED(hres))
 624         return hres;
 625
 626     function->flags = flags;
 627     function->length = flags & PROPF_ARGMASK;
 628
 629     *ret = function;
 630     return S_OK;
 631 }
 632
 633 static HRESULT set_prototype(script_ctx_t *ctx, jsdisp_t *dispex, jsdisp_t *prototype)
 634 {
 635     jsexcept_t jsexcept;
 636     VARIANT var;
 637
 638     var_set_jsdisp(&var, prototype);
 639     memset(&jsexcept, 0, sizeof(jsexcept));
 640
 641     return jsdisp_propput_name(dispex, prototypeW, &var, &jsexcept);
 642 }
 643
 644 HRESULT create_builtin_function(script_ctx_t *ctx, builtin_invoke_t value_proc, const WCHAR *name,
 645         const builtin_info_t *builtin_info, DWORD flags, jsdisp_t *prototype, jsdisp_t **ret)
 646 {
 647     FunctionInstance *function;
 648     HRESULT hres;
 649
 650     hres = create_function(ctx, builtin_info, flags, FALSE, NULL, &function);
 651     if(FAILED(hres))
 652         return hres;
 653
 654     if(builtin_info) {
 655         VARIANT var;
 656
 657         num_set_int(&var, function->length);
 658         hres = jsdisp_propput_const(&function->dispex, lengthW, &var);
 659     }
 660
 661     if(SUCCEEDED(hres))
 662         hres = set_prototype(ctx, &function->dispex, prototype);
 663     if(FAILED(hres)) {
 664         jsdisp_release(&function->dispex);
 665         return hres;
 666     }
 667
 668     function->value_proc = value_proc;
 669     function->name = name;
 670
 671     *ret = &function->dispex;
 672     return S_OK;
 673 }
 674
 675 HRESULT create_source_function(script_ctx_t *ctx, bytecode_t *code, function_code_t *func_code,
 676         scope_chain_t *scope_chain, jsdisp_t **ret)
 677 {
 678     FunctionInstance *function;
 679     jsdisp_t *prototype;
 680     HRESULT hres;
 681
 682     hres = create_object(ctx, NULL, &prototype);
 683     if(FAILED(hres))
 684         return hres;
 685
 686     hres = create_function(ctx, NULL, PROPF_CONSTR, FALSE, NULL, &function);
 687     if(SUCCEEDED(hres)) {
 688         hres = set_prototype(ctx, &function->dispex, prototype);
 689         if(FAILED(hres))
 690             jsdisp_release(&function->dispex);
 691     }
 692     jsdisp_release(prototype);
 693     if(FAILED(hres))
 694         return hres;
 695
 696     if(scope_chain) {
 697         scope_addref(scope_chain);
 698         function->scope_chain = scope_chain;
 699     }
 700
 701     bytecode_addref(code);
 702     function->code = code;
 703     function->func_code = func_code;
 704     function->length = function->func_code->param_cnt;
 705
 706     *ret = &function->dispex;
 707     return S_OK;
 708 }
 709
 710 static HRESULT construct_function(script_ctx_t *ctx, DISPPARAMS *dp, jsexcept_t *ei, IDispatch **ret)
 711 {
 712     WCHAR *str = NULL, *ptr;
 713     DWORD argc, len = 0, l;
 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, FALSE, &code);
 779     heap_free(str);
 780     if(FAILED(hres))
 781         return hres;
 782
 783     if(code->global_code.func_cnt != 1 || code->global_code.var_cnt) {
 784         ERR("Invalid parser result!\n");
 785         release_bytecode(code);
 786         return E_UNEXPECTED;
 787     }
 788
 789     hres = create_source_function(ctx, code, code->global_code.funcs, NULL, &function);
 790     release_bytecode(code);
 791     if(FAILED(hres))
 792         return hres;
 793
 794     *ret = to_disp(function);
 795     return S_OK;
 796 }
 797
 798 static HRESULT FunctionConstr_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 799         VARIANT *retv, jsexcept_t *ei)
 800 {
 801     HRESULT hres;
 802
 803     TRACE("\n");
 804
 805     switch(flags) {
 806     case DISPATCH_CONSTRUCT: {
 807         IDispatch *ret;
 808
 809         hres = construct_function(ctx, dp, ei, &ret);
 810         if(FAILED(hres))
 811             return hres;
 812
 813         V_VT(retv) = VT_DISPATCH;
 814         V_DISPATCH(retv) = ret;
 815         break;
 816     }
 817     default:
 818         FIXME("unimplemented flags %x\n", flags);
 819         return E_NOTIMPL;
 820     }
 821
 822     return S_OK;
 823 }
 824
 825 static HRESULT FunctionProt_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
 826         VARIANT *retv, jsexcept_t *ei)
 827 {
 828     FIXME("\n");
 829     return E_NOTIMPL;
 830 }
 831
 832 HRESULT init_function_constr(script_ctx_t *ctx, jsdisp_t *object_prototype)
 833 {
 834     FunctionInstance *prot, *constr;
 835     HRESULT hres;
 836
 837     static const WCHAR FunctionW[] = {'F','u','n','c','t','i','o','n',0};
 838
 839     hres = create_function(ctx, NULL, PROPF_CONSTR, TRUE, object_prototype, &prot);
 840     if(FAILED(hres))
 841         return hres;
 842
 843     prot->value_proc = FunctionProt_value;
 844     prot->name = prototypeW;
 845
 846     hres = create_function(ctx, NULL, PROPF_CONSTR|1, TRUE, &prot->dispex, &constr);
 847     if(SUCCEEDED(hres)) {
 848         constr->value_proc = FunctionConstr_value;
 849         constr->name = FunctionW;
 850         hres = set_prototype(ctx, &constr->dispex, &prot->dispex);
 851         if(FAILED(hres))
 852             jsdisp_release(&constr->dispex);
 853     }
 854     jsdisp_release(&prot->dispex);
 855     if(FAILED(hres))
 856         return hres;
 857
 858     ctx->function_constr = &constr->dispex;
 859     return S_OK;
 860 }