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 HRESULT init_parameters(jsdisp_t *var_disp, FunctionInstance *function, unsigned argc, VARIANT *argv,
  59         jsexcept_t *ei)
  60 {
  61     VARIANT var_empty;
  62     DWORD i=0;
  63     HRESULT hres;
  64
  65     V_VT(&var_empty) = VT_EMPTY;
  66
  67     for(i=0; i < function->func_code->param_cnt; i++) {
  68         hres = jsdisp_propput_name(var_disp, function->func_code->params[i],
  69                 i < argc ? argv+i : &var_empty, ei);
  70         if(FAILED(hres))
  71             return hres;
  72     }
  73
  74     return S_OK;
  75 }
  76
  77 static HRESULT Arguments_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, VARIANT *argv,
  78         jsval_t *r, jsexcept_t *ei)
  79 {
  80     FIXME("\n");
  81     return E_NOTIMPL;
  82 }
  83
  84 static const builtin_info_t Arguments_info = {
  85     JSCLASS_ARGUMENTS,
  86     {NULL, Arguments_value, 0},
  87     0, NULL,
  88     NULL,
  89     NULL
  90 };
  91
  92 static HRESULT create_arguments(script_ctx_t *ctx, IDispatch *calee, unsigned argc, VARIANT *argv,
  93         jsexcept_t *ei, jsdisp_t **ret)
  94 {
  95     jsdisp_t *args;
  96     VARIANT var;
  97     DWORD i;
  98     HRESULT hres;
  99
 100     static const WCHAR caleeW[] = {'c','a','l','l','e','e',0};
 101
 102     args = heap_alloc_zero(sizeof(jsdisp_t));
 103     if(!args)
 104         return E_OUTOFMEMORY;
 105
 106     hres = init_dispex_from_constr(args, ctx, &Arguments_info, ctx->object_constr);
 107     if(FAILED(hres)) {
 108         heap_free(args);
 109         return hres;
 110     }
 111
 112     for(i=0; i < argc; i++) {
 113         hres = jsdisp_propput_idx(args, i, argv+i, ei);
 114         if(FAILED(hres))
 115             break;
 116     }
 117
 118     if(SUCCEEDED(hres)) {
 119         num_set_int(&var, argc);
 120         hres = jsdisp_propput_name(args, lengthW, &var, ei);
 121
 122         if(SUCCEEDED(hres)) {
 123             V_VT(&var) = VT_DISPATCH;
 124             V_DISPATCH(&var) = calee;
 125             hres = jsdisp_propput_name(args, caleeW, &var, ei);
 126         }
 127     }
 128
 129     if(FAILED(hres)) {
 130         jsdisp_release(args);
 131         return hres;
 132     }
 133
 134     *ret = args;
 135     return S_OK;
 136 }
 137
 138 static HRESULT create_var_disp(script_ctx_t *ctx, FunctionInstance *function, jsdisp_t *arg_disp,
 139         unsigned argc, VARIANT *argv, jsexcept_t *ei, jsdisp_t **ret)
 140 {
 141     jsdisp_t *var_disp;
 142     VARIANT var;
 143     HRESULT hres;
 144
 145     hres = create_dispex(ctx, NULL, NULL, &var_disp);
 146     if(FAILED(hres))
 147         return hres;
 148
 149     var_set_jsdisp(&var, arg_disp);
 150     hres = jsdisp_propput_name(var_disp, argumentsW, &var, ei);
 151     if(SUCCEEDED(hres))
 152         hres = init_parameters(var_disp, function, argc, argv, ei);
 153     if(FAILED(hres)) {
 154         jsdisp_release(var_disp);
 155         return hres;
 156     }
 157
 158     *ret = var_disp;
 159     return S_OK;
 160 }
 161
 162 static HRESULT invoke_source(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_obj, unsigned argc, VARIANT *argv,
 163         jsval_t *r, jsexcept_t *ei)
 164 {
 165     jsdisp_t *var_disp, *arg_disp;
 166     exec_ctx_t *exec_ctx;
 167     scope_chain_t *scope;
 168     HRESULT hres;
 169
 170     if(!function->func_code) {
 171         FIXME("no source\n");
 172         return E_FAIL;
 173     }
 174
 175     hres = create_arguments(ctx, to_disp(&function->dispex), argc, argv, ei, &arg_disp);
 176     if(FAILED(hres))
 177         return hres;
 178
 179     hres = create_var_disp(ctx, function, arg_disp, argc, argv, ei, &var_disp);
 180     if(FAILED(hres)) {
 181         jsdisp_release(arg_disp);
 182         return hres;
 183     }
 184
 185     hres = scope_push(function->scope_chain, var_disp, to_disp(var_disp), &scope);
 186     if(SUCCEEDED(hres)) {
 187         hres = create_exec_ctx(ctx, this_obj, var_disp, scope, FALSE, &exec_ctx);
 188         scope_release(scope);
 189     }
 190     jsdisp_release(var_disp);
 191     if(SUCCEEDED(hres)) {
 192         jsdisp_t *prev_args;
 193         VARIANT retv;
 194
 195         prev_args = function->arguments;
 196         function->arguments = arg_disp;
 197         hres = exec_source(exec_ctx, function->code, function->func_code, FALSE, ei, r ? &retv : NULL);
 198         function->arguments = prev_args;
 199         if(SUCCEEDED(hres) && r) {
 200             hres = variant_to_jsval(&retv, r);
 201             VariantClear(&retv);
 202         }
 203     }
 204
 205     jsdisp_release(arg_disp);
 206     exec_release(exec_ctx);
 207     return hres;
 208 }
 209
 210 static HRESULT invoke_constructor(script_ctx_t *ctx, FunctionInstance *function, unsigned argc, VARIANT *argv,
 211         jsval_t *r, jsexcept_t *ei)
 212 {
 213     jsdisp_t *this_obj;
 214     jsval_t var;
 215     HRESULT hres;
 216
 217     hres = create_object(ctx, &function->dispex, &this_obj);
 218     if(FAILED(hres))
 219         return hres;
 220
 221     hres = invoke_source(ctx, function, to_disp(this_obj), argc, argv, &var, ei);
 222     if(FAILED(hres)) {
 223         jsdisp_release(this_obj);
 224         return hres;
 225     }
 226
 227     if(is_object_instance(var)) {
 228         jsdisp_release(this_obj);
 229         *r = var;
 230     }else {
 231         jsval_release(var);
 232         *r = jsval_obj(this_obj);
 233     }
 234     return S_OK;
 235 }
 236
 237 static HRESULT invoke_value_proc(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_disp, WORD flags, unsigned argc, VARIANT *argv,
 238         jsval_t *r, jsexcept_t *ei)
 239 {
 240     vdisp_t vthis;
 241     HRESULT hres;
 242
 243     if(this_disp)
 244         set_disp(&vthis, this_disp);
 245     else if(ctx->host_global)
 246         set_disp(&vthis, ctx->host_global);
 247     else
 248         set_jsdisp(&vthis, ctx->global);
 249
 250     hres = function->value_proc(ctx, &vthis, flags, argc, argv, r, ei);
 251
 252     vdisp_release(&vthis);
 253     return hres;
 254 }
 255
 256 static HRESULT call_function(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_obj,
 257         unsigned argc, VARIANT *argv, jsval_t *r, jsexcept_t *ei)
 258 {
 259     if(function->value_proc)
 260         return invoke_value_proc(ctx, function, this_obj, DISPATCH_METHOD, argc, argv, r, ei);
 261
 262     return invoke_source(ctx, function, this_obj, argc, argv, r, ei);
 263 }
 264
 265 static HRESULT function_to_string(FunctionInstance *function, BSTR *ret)
 266 {
 267     BSTR str;
 268
 269     static const WCHAR native_prefixW[] = {'\n','f','u','n','c','t','i','o','n',' '};
 270     static const WCHAR native_suffixW[] =
 271         {'(',')',' ','{','\n',' ',' ',' ',' ','[','n','a','t','i','v','e',' ','c','o','d','e',']','\n','}','\n'};
 272
 273     if(function->value_proc) {
 274         DWORD name_len;
 275
 276         name_len = strlenW(function->name);
 277         str = SysAllocStringLen(NULL, sizeof(native_prefixW) + name_len*sizeof(WCHAR) + sizeof(native_suffixW));
 278         if(!str)
 279             return E_OUTOFMEMORY;
 280
 281         memcpy(str, native_prefixW, sizeof(native_prefixW));
 282         memcpy(str + sizeof(native_prefixW)/sizeof(WCHAR), function->name, name_len*sizeof(WCHAR));
 283         memcpy(str + sizeof(native_prefixW)/sizeof(WCHAR) + name_len, native_suffixW, sizeof(native_suffixW));
 284     }else {
 285         str = SysAllocStringLen(function->func_code->source, function->func_code->source_len);
 286         if(!str)
 287             return E_OUTOFMEMORY;
 288     }
 289
 290     *ret = str;
 291     return S_OK;
 292 }
 293
 294 HRESULT Function_invoke(jsdisp_t *func_this, IDispatch *jsthis, WORD flags, unsigned argc, VARIANT *argv, jsval_t *r, jsexcept_t *ei)
 295 {
 296     FunctionInstance *function;
 297
 298     TRACE("func %p this %p\n", func_this, jsthis);
 299
 300     assert(is_class(func_this, JSCLASS_FUNCTION));
 301     function = (FunctionInstance*)func_this;
 302
 303     if(function->value_proc)
 304         return invoke_value_proc(function->dispex.ctx, function, jsthis, flags, argc, argv, r, ei);
 305
 306     if(flags == DISPATCH_CONSTRUCT)
 307         return invoke_constructor(function->dispex.ctx, function, argc, argv, r, ei);
 308
 309     assert(flags == DISPATCH_METHOD);
 310     return invoke_source(function->dispex.ctx, function, jsthis, argc, argv, r, ei);
 311 }
 312
 313 static HRESULT Function_length(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, VARIANT *argv,
 314         jsval_t *r, jsexcept_t *ei)
 315 {
 316     FunctionInstance *This = function_from_vdisp(jsthis);
 317
 318     TRACE("%p %d\n", This, This->length);
 319
 320     switch(flags) {
 321     case DISPATCH_PROPERTYGET:
 322         *r = jsval_number(This->length);
 323         break;
 324     default:
 325         FIXME("unimplemented flags %x\n", flags);
 326         return E_NOTIMPL;
 327     }
 328
 329     return S_OK;
 330 }
 331
 332 static HRESULT Function_toString(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, VARIANT *argv,
 333         jsval_t *r, jsexcept_t *ei)
 334 {
 335     FunctionInstance *function;
 336     BSTR str;
 337     HRESULT hres;
 338
 339     TRACE("\n");
 340
 341     if(!(function = function_this(jsthis)))
 342         return throw_type_error(ctx, ei, JS_E_FUNCTION_EXPECTED, NULL);
 343
 344     hres = function_to_string(function, &str);
 345     if(FAILED(hres))
 346         return hres;
 347
 348     if(r)
 349         *r = jsval_string(str);
 350     else
 351         SysFreeString(str);
 352     return S_OK;
 353 }
 354
 355 static HRESULT array_to_args(script_ctx_t *ctx, jsdisp_t *arg_array, jsexcept_t *ei, unsigned *argc, VARIANT **ret)
 356 {
 357     VARIANT var, *argv;
 358     DWORD length, i;
 359     HRESULT hres;
 360
 361     hres = jsdisp_propget_name(arg_array, lengthW, &var, ei);
 362     if(FAILED(hres))
 363         return hres;
 364
 365     hres = to_uint32(ctx, &var, ei, &length);
 366     VariantClear(&var);
 367     if(FAILED(hres))
 368         return hres;
 369
 370     argv = heap_alloc(length * sizeof(VARIANT));
 371     if(!argv)
 372         return E_OUTOFMEMORY;
 373
 374     for(i=0; i<length; i++) {
 375         hres = jsdisp_get_idx(arg_array, i, argv+i, ei);
 376         if(hres == DISP_E_UNKNOWNNAME)
 377             V_VT(argv+i) = VT_EMPTY;
 378         else if(FAILED(hres)) {
 379             while(i--)
 380                 VariantClear(argv+i);
 381             heap_free(argv);
 382             return hres;
 383         }
 384     }
 385
 386     *argc = length;
 387     *ret = argv;
 388     return S_OK;
 389 }
 390
 391 static HRESULT Function_apply(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, VARIANT *argv,
 392         jsval_t *r, jsexcept_t *ei)
 393 {
 394     FunctionInstance *function;
 395     VARIANT *args = NULL;
 396     unsigned i, cnt = 0;
 397     IDispatch *this_obj = NULL;
 398     HRESULT hres = S_OK;
 399
 400     TRACE("\n");
 401
 402     if(!(function = function_this(jsthis)))
 403         return throw_type_error(ctx, ei, JS_E_FUNCTION_EXPECTED, NULL);
 404
 405     if(argc) {
 406         if(V_VT(argv) != VT_EMPTY && V_VT(argv) != VT_NULL) {
 407             hres = to_object(ctx, argv, &this_obj);
 408             if(FAILED(hres))
 409                 return hres;
 410         }
 411     }
 412
 413     if(argc >= 2) {
 414         jsdisp_t *arg_array = NULL;
 415
 416         if(V_VT(argv+1) == VT_DISPATCH) {
 417             arg_array = iface_to_jsdisp((IUnknown*)V_DISPATCH(argv+1));
 418             if(arg_array &&
 419                (!is_class(arg_array, JSCLASS_ARRAY) && !is_class(arg_array, JSCLASS_ARGUMENTS) )) {
 420                 jsdisp_release(arg_array);
 421                 arg_array = NULL;
 422             }
 423         }
 424
 425         if(arg_array) {
 426             hres = array_to_args(ctx, arg_array, ei, &cnt, &args);
 427             jsdisp_release(arg_array);
 428         }else {
 429             FIXME("throw TypeError\n");
 430             hres = E_FAIL;
 431         }
 432     }
 433
 434     if(SUCCEEDED(hres))
 435         hres = call_function(ctx, function, this_obj, cnt, args, r, ei);
 436
 437     if(this_obj)
 438         IDispatch_Release(this_obj);
 439     for(i=0; i < cnt; i++)
 440         VariantClear(args+i);
 441     heap_free(args);
 442     return hres;
 443 }
 444
 445 static HRESULT Function_call(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, VARIANT *argv,
 446         jsval_t *r, jsexcept_t *ei)
 447 {
 448     FunctionInstance *function;
 449     IDispatch *this_obj = NULL;
 450     unsigned cnt = 0;
 451     HRESULT hres;
 452
 453     TRACE("\n");
 454
 455     if(!(function = function_this(jsthis)))
 456         return throw_type_error(ctx, ei, JS_E_FUNCTION_EXPECTED, NULL);
 457
 458     if(argc) {
 459         if(V_VT(argv) != VT_EMPTY && V_VT(argv) != VT_NULL) {
 460             hres = to_object(ctx, argv, &this_obj);
 461             if(FAILED(hres))
 462                 return hres;
 463         }
 464
 465         cnt = argc-1;
 466     }
 467
 468     hres = call_function(ctx, function, this_obj, cnt, argv+1, r, ei);
 469
 470     if(this_obj)
 471         IDispatch_Release(this_obj);
 472     return hres;
 473 }
 474
 475 HRESULT Function_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, VARIANT *argv,
 476         jsval_t *r, jsexcept_t *ei)
 477 {
 478     FunctionInstance *function;
 479
 480     TRACE("\n");
 481
 482     if(!is_vclass(jsthis, JSCLASS_FUNCTION)) {
 483         ERR("dispex is not a function\n");
 484         return E_FAIL;
 485     }
 486
 487     function = (FunctionInstance*)jsthis->u.jsdisp;
 488
 489     switch(flags) {
 490     case DISPATCH_METHOD:
 491         assert(function->value_proc != NULL);
 492         return invoke_value_proc(ctx, function, NULL, flags, argc, argv, r, ei);
 493
 494     case DISPATCH_PROPERTYGET: {
 495         HRESULT hres;
 496         BSTR str;
 497
 498         hres = function_to_string(function, &str);
 499         if(FAILED(hres))
 500             return hres;
 501
 502         *r = jsval_string(str);
 503         break;
 504     }
 505
 506     case DISPATCH_CONSTRUCT:
 507         assert(function->value_proc != NULL);
 508         return invoke_value_proc(ctx, function, NULL, flags, argc, argv, r, ei);
 509
 510     default:
 511         FIXME("not implemented flags %x\n", flags);
 512         return E_NOTIMPL;
 513     }
 514
 515     return S_OK;
 516 }
 517
 518 static HRESULT Function_arguments(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags,
 519         unsigned argc, VARIANT *argv, jsval_t *r, jsexcept_t *ei)
 520 {
 521     FunctionInstance *function = (FunctionInstance*)jsthis->u.jsdisp;
 522     HRESULT hres = S_OK;
 523
 524     TRACE("\n");
 525
 526     switch(flags) {
 527     case DISPATCH_PROPERTYGET: {
 528         *r = function->arguments ? jsval_obj(jsdisp_addref(function->arguments)) : jsval_null();
 529         break;
 530     }
 531     case DISPATCH_PROPERTYPUT:
 532         break;
 533     default:
 534         FIXME("unimplemented flags %x\n", flags);
 535         hres = E_NOTIMPL;
 536     }
 537
 538     return hres;
 539 }
 540
 541 static void Function_destructor(jsdisp_t *dispex)
 542 {
 543     FunctionInstance *This = (FunctionInstance*)dispex;
 544
 545     if(This->code)
 546         release_bytecode(This->code);
 547     if(This->scope_chain)
 548         scope_release(This->scope_chain);
 549     heap_free(This);
 550 }
 551
 552 static const builtin_prop_t Function_props[] = {
 553     {applyW,                 Function_apply,                 PROPF_METHOD|2},
 554     {argumentsW,             Function_arguments,             0},
 555     {callW,                  Function_call,                  PROPF_METHOD|1},
 556     {lengthW,                Function_length,                0},
 557     {toStringW,              Function_toString,              PROPF_METHOD}
 558 };
 559
 560 static const builtin_info_t Function_info = {
 561     JSCLASS_FUNCTION,
 562     {NULL, Function_value, 0},
 563     sizeof(Function_props)/sizeof(*Function_props),
 564     Function_props,
 565     Function_destructor,
 566     NULL
 567 };
 568
 569 static const builtin_prop_t FunctionInst_props[] = {
 570     {argumentsW,             Function_arguments,             0},
 571     {lengthW,                Function_length,                0}
 572 };
 573
 574 static const builtin_info_t FunctionInst_info = {
 575     JSCLASS_FUNCTION,
 576     {NULL, Function_value, 0},
 577     sizeof(FunctionInst_props)/sizeof(*FunctionInst_props),
 578     FunctionInst_props,
 579     Function_destructor,
 580     NULL
 581 };
 582
 583 static HRESULT create_function(script_ctx_t *ctx, const builtin_info_t *builtin_info, DWORD flags,
 584         BOOL funcprot, jsdisp_t *prototype, FunctionInstance **ret)
 585 {
 586     FunctionInstance *function;
 587     HRESULT hres;
 588
 589     function = heap_alloc_zero(sizeof(FunctionInstance));
 590     if(!function)
 591         return E_OUTOFMEMORY;
 592
 593     if(funcprot)
 594         hres = init_dispex(&function->dispex, ctx, builtin_info, prototype);
 595     else if(builtin_info)
 596         hres = init_dispex_from_constr(&function->dispex, ctx, builtin_info, ctx->function_constr);
 597     else
 598         hres = init_dispex_from_constr(&function->dispex, ctx, &FunctionInst_info, ctx->function_constr);
 599     if(FAILED(hres))
 600         return hres;
 601
 602     function->flags = flags;
 603     function->length = flags & PROPF_ARGMASK;
 604
 605     *ret = function;
 606     return S_OK;
 607 }
 608
 609 static HRESULT set_prototype(script_ctx_t *ctx, jsdisp_t *dispex, jsdisp_t *prototype)
 610 {
 611     jsexcept_t jsexcept;
 612     VARIANT var;
 613
 614     var_set_jsdisp(&var, prototype);
 615     memset(&jsexcept, 0, sizeof(jsexcept));
 616
 617     return jsdisp_propput_name(dispex, prototypeW, &var, &jsexcept);
 618 }
 619
 620 HRESULT create_builtin_function(script_ctx_t *ctx, builtin_invoke_t value_proc, const WCHAR *name,
 621         const builtin_info_t *builtin_info, DWORD flags, jsdisp_t *prototype, jsdisp_t **ret)
 622 {
 623     FunctionInstance *function;
 624     HRESULT hres;
 625
 626     hres = create_function(ctx, builtin_info, flags, FALSE, NULL, &function);
 627     if(FAILED(hres))
 628         return hres;
 629
 630     if(builtin_info) {
 631         VARIANT var;
 632
 633         num_set_int(&var, function->length);
 634         hres = jsdisp_propput_const(&function->dispex, lengthW, &var);
 635     }
 636
 637     if(SUCCEEDED(hres))
 638         hres = set_prototype(ctx, &function->dispex, prototype);
 639     if(FAILED(hres)) {
 640         jsdisp_release(&function->dispex);
 641         return hres;
 642     }
 643
 644     function->value_proc = value_proc;
 645     function->name = name;
 646
 647     *ret = &function->dispex;
 648     return S_OK;
 649 }
 650
 651 static HRESULT set_constructor_prop(script_ctx_t *ctx, jsdisp_t *constr, jsdisp_t *prot)
 652 {
 653     VARIANT v;
 654
 655     static const WCHAR constructorW[] = {'c','o','n','s','t','r','u','c','t','o','r',0};
 656
 657     V_VT(&v) = VT_DISPATCH;
 658     V_DISPATCH(&v) = to_disp(constr);
 659     return jsdisp_propput_dontenum(prot, constructorW, &v);
 660 }
 661
 662 HRESULT create_builtin_constructor(script_ctx_t *ctx, builtin_invoke_t value_proc, const WCHAR *name,
 663         const builtin_info_t *builtin_info, DWORD flags, jsdisp_t *prototype, jsdisp_t **ret)
 664 {
 665     jsdisp_t *constr;
 666     HRESULT hres;
 667
 668     hres = create_builtin_function(ctx, value_proc, name, builtin_info, flags, prototype, &constr);
 669     if(FAILED(hres))
 670         return hres;
 671
 672     hres = set_constructor_prop(ctx, constr, prototype);
 673     if(FAILED(hres)) {
 674         jsdisp_release(constr);
 675         return hres;
 676     }
 677
 678     *ret = constr;
 679     return S_OK;
 680 }
 681
 682 HRESULT create_source_function(script_ctx_t *ctx, bytecode_t *code, function_code_t *func_code,
 683         scope_chain_t *scope_chain, jsdisp_t **ret)
 684 {
 685     FunctionInstance *function;
 686     jsdisp_t *prototype;
 687     HRESULT hres;
 688
 689     hres = create_object(ctx, NULL, &prototype);
 690     if(FAILED(hres))
 691         return hres;
 692
 693     hres = create_function(ctx, NULL, PROPF_CONSTR, FALSE, NULL, &function);
 694     if(SUCCEEDED(hres)) {
 695         hres = set_prototype(ctx, &function->dispex, prototype);
 696         if(SUCCEEDED(hres))
 697             hres = set_constructor_prop(ctx, &function->dispex, prototype);
 698         if(FAILED(hres))
 699             jsdisp_release(&function->dispex);
 700     }
 701     jsdisp_release(prototype);
 702     if(FAILED(hres))
 703         return hres;
 704
 705     if(scope_chain) {
 706         scope_addref(scope_chain);
 707         function->scope_chain = scope_chain;
 708     }
 709
 710     bytecode_addref(code);
 711     function->code = code;
 712     function->func_code = func_code;
 713     function->length = function->func_code->param_cnt;
 714
 715     *ret = &function->dispex;
 716     return S_OK;
 717 }
 718
 719 static HRESULT construct_function(script_ctx_t *ctx, unsigned argc, VARIANT *argv, jsexcept_t *ei, IDispatch **ret)
 720 {
 721     WCHAR *str = NULL, *ptr;
 722     DWORD len = 0, l;
 723     bytecode_t *code;
 724     jsdisp_t *function;
 725     BSTR *params = NULL;
 726     int i=0, j=0;
 727     HRESULT hres = S_OK;
 728
 729     static const WCHAR function_anonymousW[] = {'f','u','n','c','t','i','o','n',' ','a','n','o','n','y','m','o','u','s','('};
 730     static const WCHAR function_beginW[] = {')',' ','{','\n'};
 731     static const WCHAR function_endW[] = {'\n','}',0};
 732
 733     if(argc) {
 734         params = heap_alloc(argc*sizeof(BSTR));
 735         if(!params)
 736             return E_OUTOFMEMORY;
 737
 738         if(argc > 2)
 739             len = (argc-2)*2; /* separating commas */
 740         for(i=0; i < argc; i++) {
 741             hres = to_string(ctx, argv+i, ei, params+i);
 742             if(FAILED(hres))
 743                 break;
 744             len += SysStringLen(params[i]);
 745         }
 746     }
 747
 748     if(SUCCEEDED(hres)) {
 749         len += (sizeof(function_anonymousW) + sizeof(function_beginW) + sizeof(function_endW)) / sizeof(WCHAR);
 750         str = heap_alloc(len*sizeof(WCHAR));
 751         if(str) {
 752             memcpy(str, function_anonymousW, sizeof(function_anonymousW));
 753             ptr = str + sizeof(function_anonymousW)/sizeof(WCHAR);
 754             if(argc > 1) {
 755                 while(1) {
 756                     l = SysStringLen(params[j]);
 757                     memcpy(ptr, params[j], l*sizeof(WCHAR));
 758                     ptr += l;
 759                     if(++j == argc-1)
 760                         break;
 761                     *ptr++ = ',';
 762                     *ptr++ = ' ';
 763                 }
 764             }
 765             memcpy(ptr, function_beginW, sizeof(function_beginW));
 766             ptr += sizeof(function_beginW)/sizeof(WCHAR);
 767             if(argc) {
 768                 l = SysStringLen(params[argc-1]);
 769                 memcpy(ptr, params[argc-1], l*sizeof(WCHAR));
 770                 ptr += l;
 771             }
 772             memcpy(ptr, function_endW, sizeof(function_endW));
 773
 774             TRACE("%s\n", debugstr_w(str));
 775         }else {
 776             hres = E_OUTOFMEMORY;
 777         }
 778     }
 779
 780     while(--i >= 0)
 781         SysFreeString(params[i]);
 782     heap_free(params);
 783     if(FAILED(hres))
 784         return hres;
 785
 786     hres = compile_script(ctx, str, NULL, FALSE, FALSE, &code);
 787     heap_free(str);
 788     if(FAILED(hres))
 789         return hres;
 790
 791     if(code->global_code.func_cnt != 1 || code->global_code.var_cnt) {
 792         ERR("Invalid parser result!\n");
 793         release_bytecode(code);
 794         return E_UNEXPECTED;
 795     }
 796
 797     hres = create_source_function(ctx, code, code->global_code.funcs, NULL, &function);
 798     release_bytecode(code);
 799     if(FAILED(hres))
 800         return hres;
 801
 802     *ret = to_disp(function);
 803     return S_OK;
 804 }
 805
 806 static HRESULT FunctionConstr_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, VARIANT *argv,
 807         jsval_t *r, jsexcept_t *ei)
 808 {
 809     HRESULT hres;
 810
 811     TRACE("\n");
 812
 813     switch(flags) {
 814     case DISPATCH_CONSTRUCT: {
 815         IDispatch *ret;
 816
 817         hres = construct_function(ctx, argc, argv, ei, &ret);
 818         if(FAILED(hres))
 819             return hres;
 820
 821         *r = jsval_disp(ret);
 822         break;
 823     }
 824     default:
 825         FIXME("unimplemented flags %x\n", flags);
 826         return E_NOTIMPL;
 827     }
 828
 829     return S_OK;
 830 }
 831
 832 static HRESULT FunctionProt_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, VARIANT *argv,
 833         jsval_t *r, jsexcept_t *ei)
 834 {
 835     FIXME("\n");
 836     return E_NOTIMPL;
 837 }
 838
 839 HRESULT init_function_constr(script_ctx_t *ctx, jsdisp_t *object_prototype)
 840 {
 841     FunctionInstance *prot, *constr;
 842     HRESULT hres;
 843
 844     static const WCHAR FunctionW[] = {'F','u','n','c','t','i','o','n',0};
 845
 846     hres = create_function(ctx, &Function_info, PROPF_CONSTR, TRUE, object_prototype, &prot);
 847     if(FAILED(hres))
 848         return hres;
 849
 850     prot->value_proc = FunctionProt_value;
 851     prot->name = prototypeW;
 852
 853     hres = create_function(ctx, &FunctionInst_info, PROPF_CONSTR|1, TRUE, &prot->dispex, &constr);
 854     if(SUCCEEDED(hres)) {
 855         constr->value_proc = FunctionConstr_value;
 856         constr->name = FunctionW;
 857         hres = set_prototype(ctx, &constr->dispex, &prot->dispex);
 858         if(SUCCEEDED(hres))
 859             hres = set_constructor_prop(ctx, &constr->dispex, &prot->dispex);
 860         if(FAILED(hres))
 861             jsdisp_release(&constr->dispex);
 862     }
 863     jsdisp_release(&prot->dispex);
 864     if(FAILED(hres))
 865         return hres;
 866
 867     ctx->function_constr = &constr->dispex;
 868     return S_OK;
 869 }