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         VARIANT *retv, 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         VARIANT *retv, 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, &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
 194         prev_args = function->arguments;
 195         function->arguments = arg_disp;
 196         hres = exec_source(exec_ctx, function->code, function->func_code, FALSE, ei, retv);
 197         function->arguments = prev_args;
 198
 199         jsdisp_release(arg_disp);
 200         exec_release(exec_ctx);
 201     }
 202
 203     return hres;
 204 }
 205
 206 static HRESULT invoke_constructor(script_ctx_t *ctx, FunctionInstance *function, unsigned argc, VARIANT *argv,
 207         VARIANT *retv, jsexcept_t *ei)
 208 {
 209     jsdisp_t *this_obj;
 210     VARIANT var;
 211     HRESULT hres;
 212
 213     hres = create_object(ctx, &function->dispex, &this_obj);
 214     if(FAILED(hres))
 215         return hres;
 216
 217     hres = invoke_source(ctx, function, to_disp(this_obj), argc, argv, &var, ei);
 218     if(FAILED(hres)) {
 219         jsdisp_release(this_obj);
 220         return hres;
 221     }
 222
 223     if(V_VT(&var) == VT_DISPATCH) {
 224         jsdisp_release(this_obj);
 225         V_VT(retv) = VT_DISPATCH;
 226         V_DISPATCH(retv) = V_DISPATCH(&var);
 227     }else {
 228         VariantClear(&var);
 229         var_set_jsdisp(retv, this_obj);
 230     }
 231     return S_OK;
 232 }
 233
 234 static HRESULT invoke_value_proc(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_disp, WORD flags, unsigned argc, VARIANT *argv,
 235         VARIANT *retv, jsexcept_t *ei)
 236 {
 237     vdisp_t vthis;
 238     HRESULT hres;
 239
 240     if(this_disp)
 241         set_disp(&vthis, this_disp);
 242     else if(ctx->host_global)
 243         set_disp(&vthis, ctx->host_global);
 244     else
 245         set_jsdisp(&vthis, ctx->global);
 246
 247     hres = function->value_proc(ctx, &vthis, flags, argc, argv, retv, ei);
 248
 249     vdisp_release(&vthis);
 250     return hres;
 251 }
 252
 253 static HRESULT call_function(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_obj,
 254         unsigned argc, VARIANT *argv, VARIANT *retv, jsexcept_t *ei)
 255 {
 256     if(function->value_proc)
 257         return invoke_value_proc(ctx, function, this_obj, DISPATCH_METHOD, argc, argv, retv, ei);
 258
 259     return invoke_source(ctx, function, this_obj, argc, argv, retv, ei);
 260 }
 261
 262 static HRESULT function_to_string(FunctionInstance *function, BSTR *ret)
 263 {
 264     BSTR str;
 265
 266     static const WCHAR native_prefixW[] = {'\n','f','u','n','c','t','i','o','n',' '};
 267     static const WCHAR native_suffixW[] =
 268         {'(',')',' ','{','\n',' ',' ',' ',' ','[','n','a','t','i','v','e',' ','c','o','d','e',']','\n','}','\n'};
 269
 270     if(function->value_proc) {
 271         DWORD name_len;
 272
 273         name_len = strlenW(function->name);
 274         str = SysAllocStringLen(NULL, sizeof(native_prefixW) + name_len*sizeof(WCHAR) + sizeof(native_suffixW));
 275         if(!str)
 276             return E_OUTOFMEMORY;
 277
 278         memcpy(str, native_prefixW, sizeof(native_prefixW));
 279         memcpy(str + sizeof(native_prefixW)/sizeof(WCHAR), function->name, name_len*sizeof(WCHAR));
 280         memcpy(str + sizeof(native_prefixW)/sizeof(WCHAR) + name_len, native_suffixW, sizeof(native_suffixW));
 281     }else {
 282         str = SysAllocStringLen(function->func_code->source, function->func_code->source_len);
 283         if(!str)
 284             return E_OUTOFMEMORY;
 285     }
 286
 287     *ret = str;
 288     return S_OK;
 289 }
 290
 291 HRESULT Function_invoke(jsdisp_t *func_this, IDispatch *jsthis, WORD flags, unsigned argc, VARIANT *argv, VARIANT *retv, jsexcept_t *ei)
 292 {
 293     FunctionInstance *function;
 294
 295     TRACE("func %p this %p\n", func_this, jsthis);
 296
 297     assert(is_class(func_this, JSCLASS_FUNCTION));
 298     function = (FunctionInstance*)func_this;
 299
 300     if(function->value_proc)
 301         return invoke_value_proc(function->dispex.ctx, function, jsthis, flags, argc, argv, retv, ei);
 302
 303     if(flags == DISPATCH_CONSTRUCT)
 304         return invoke_constructor(function->dispex.ctx, function, argc, argv, retv, ei);
 305
 306     assert(flags == DISPATCH_METHOD);
 307     return invoke_source(function->dispex.ctx, function, jsthis, argc, argv, retv, ei);
 308 }
 309
 310 static HRESULT Function_length(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, VARIANT *argv,
 311         VARIANT *retv, jsexcept_t *ei)
 312 {
 313     FunctionInstance *This = function_from_vdisp(jsthis);
 314
 315     TRACE("%p %d\n", This, This->length);
 316
 317     switch(flags) {
 318     case DISPATCH_PROPERTYGET:
 319         num_set_int(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, unsigned argc, VARIANT *argv,
 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, unsigned *argc, VARIANT **ret)
 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     *argc = length;
 386     *ret = argv;
 387     return S_OK;
 388 }
 389
 390 static HRESULT Function_apply(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, VARIANT *argv,
 391         VARIANT *retv, jsexcept_t *ei)
 392 {
 393     FunctionInstance *function;
 394     VARIANT *args = NULL;
 395     unsigned i, cnt = 0;
 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     if(argc) {
 405         if(V_VT(argv) != VT_EMPTY && V_VT(argv) != VT_NULL) {
 406             hres = to_object(ctx, argv, &this_obj);
 407             if(FAILED(hres))
 408                 return hres;
 409         }
 410     }
 411
 412     if(argc >= 2) {
 413         jsdisp_t *arg_array = NULL;
 414
 415         if(V_VT(argv+1) == VT_DISPATCH) {
 416             arg_array = iface_to_jsdisp((IUnknown*)V_DISPATCH(argv+1));
 417             if(arg_array &&
 418                (!is_class(arg_array, JSCLASS_ARRAY) && !is_class(arg_array, JSCLASS_ARGUMENTS) )) {
 419                 jsdisp_release(arg_array);
 420                 arg_array = NULL;
 421             }
 422         }
 423
 424         if(arg_array) {
 425             hres = array_to_args(ctx, arg_array, ei, &cnt, &args);
 426             jsdisp_release(arg_array);
 427         }else {
 428             FIXME("throw TypeError\n");
 429             hres = E_FAIL;
 430         }
 431     }
 432
 433     if(SUCCEEDED(hres))
 434         hres = call_function(ctx, function, this_obj, cnt, args, retv, ei);
 435
 436     if(this_obj)
 437         IDispatch_Release(this_obj);
 438     for(i=0; i < cnt; i++)
 439         VariantClear(args+i);
 440     heap_free(args);
 441     return hres;
 442 }
 443
 444 static HRESULT Function_call(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, VARIANT *argv,
 445         VARIANT *retv, jsexcept_t *ei)
 446 {
 447     FunctionInstance *function;
 448     IDispatch *this_obj = NULL;
 449     unsigned cnt = 0;
 450     HRESULT hres;
 451
 452     TRACE("\n");
 453
 454     if(!(function = function_this(jsthis)))
 455         return throw_type_error(ctx, ei, JS_E_FUNCTION_EXPECTED, NULL);
 456
 457     if(argc) {
 458         if(V_VT(argv) != VT_EMPTY && V_VT(argv) != VT_NULL) {
 459             hres = to_object(ctx, argv, &this_obj);
 460             if(FAILED(hres))
 461                 return hres;
 462         }
 463
 464         cnt = argc-1;
 465     }
 466
 467     hres = call_function(ctx, function, this_obj, cnt, argv+1, retv, ei);
 468
 469     if(this_obj)
 470         IDispatch_Release(this_obj);
 471     return hres;
 472 }
 473
 474 HRESULT Function_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, VARIANT *argv,
 475         VARIANT *retv, jsexcept_t *ei)
 476 {
 477     FunctionInstance *function;
 478
 479     TRACE("\n");
 480
 481     if(!is_vclass(jsthis, JSCLASS_FUNCTION)) {
 482         ERR("dispex is not a function\n");
 483         return E_FAIL;
 484     }
 485
 486     function = (FunctionInstance*)jsthis->u.jsdisp;
 487
 488     switch(flags) {
 489     case DISPATCH_METHOD:
 490         assert(function->value_proc != NULL);
 491         return invoke_value_proc(ctx, function, NULL, flags, argc, argv, retv, ei);
 492
 493     case DISPATCH_PROPERTYGET: {
 494         HRESULT hres;
 495         BSTR str;
 496
 497         hres = function_to_string(function, &str);
 498         if(FAILED(hres))
 499             return hres;
 500
 501         V_VT(retv) = VT_BSTR;
 502         V_BSTR(retv) = 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, retv, 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, VARIANT *retv, 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         if(function->arguments) {
 529             jsdisp_addref(function->arguments);
 530             var_set_jsdisp(retv, function->arguments);
 531         }else {
 532             V_VT(retv) = VT_NULL;
 533         }
 534         break;
 535     }
 536     case DISPATCH_PROPERTYPUT:
 537         break;
 538     default:
 539         FIXME("unimplemented flags %x\n", flags);
 540         hres = E_NOTIMPL;
 541     }
 542
 543     return hres;
 544 }
 545
 546 static void Function_destructor(jsdisp_t *dispex)
 547 {
 548     FunctionInstance *This = (FunctionInstance*)dispex;
 549
 550     if(This->code)
 551         release_bytecode(This->code);
 552     if(This->scope_chain)
 553         scope_release(This->scope_chain);
 554     heap_free(This);
 555 }
 556
 557 static const builtin_prop_t Function_props[] = {
 558     {applyW,                 Function_apply,                 PROPF_METHOD|2},
 559     {argumentsW,             Function_arguments,             0},
 560     {callW,                  Function_call,                  PROPF_METHOD|1},
 561     {lengthW,                Function_length,                0},
 562     {toStringW,              Function_toString,              PROPF_METHOD}
 563 };
 564
 565 static const builtin_info_t Function_info = {
 566     JSCLASS_FUNCTION,
 567     {NULL, Function_value, 0},
 568     sizeof(Function_props)/sizeof(*Function_props),
 569     Function_props,
 570     Function_destructor,
 571     NULL
 572 };
 573
 574 static HRESULT create_function(script_ctx_t *ctx, const builtin_info_t *builtin_info, DWORD flags,
 575         BOOL funcprot, jsdisp_t *prototype, FunctionInstance **ret)
 576 {
 577     FunctionInstance *function;
 578     HRESULT hres;
 579
 580     function = heap_alloc_zero(sizeof(FunctionInstance));
 581     if(!function)
 582         return E_OUTOFMEMORY;
 583
 584     if(funcprot)
 585         hres = init_dispex(&function->dispex, ctx, &Function_info, prototype);
 586     else if(builtin_info)
 587         hres = init_dispex_from_constr(&function->dispex, ctx, builtin_info, ctx->function_constr);
 588     else
 589         hres = init_dispex_from_constr(&function->dispex, ctx, &Function_info, ctx->function_constr);
 590     if(FAILED(hres))
 591         return hres;
 592
 593     function->flags = flags;
 594     function->length = flags & PROPF_ARGMASK;
 595
 596     *ret = function;
 597     return S_OK;
 598 }
 599
 600 static HRESULT set_prototype(script_ctx_t *ctx, jsdisp_t *dispex, jsdisp_t *prototype)
 601 {
 602     jsexcept_t jsexcept;
 603     VARIANT var;
 604
 605     var_set_jsdisp(&var, prototype);
 606     memset(&jsexcept, 0, sizeof(jsexcept));
 607
 608     return jsdisp_propput_name(dispex, prototypeW, &var, &jsexcept);
 609 }
 610
 611 HRESULT create_builtin_function(script_ctx_t *ctx, builtin_invoke_t value_proc, const WCHAR *name,
 612         const builtin_info_t *builtin_info, DWORD flags, jsdisp_t *prototype, jsdisp_t **ret)
 613 {
 614     FunctionInstance *function;
 615     HRESULT hres;
 616
 617     hres = create_function(ctx, builtin_info, flags, FALSE, NULL, &function);
 618     if(FAILED(hres))
 619         return hres;
 620
 621     if(builtin_info) {
 622         VARIANT var;
 623
 624         num_set_int(&var, function->length);
 625         hres = jsdisp_propput_const(&function->dispex, lengthW, &var);
 626     }
 627
 628     if(SUCCEEDED(hres))
 629         hres = set_prototype(ctx, &function->dispex, prototype);
 630     if(FAILED(hres)) {
 631         jsdisp_release(&function->dispex);
 632         return hres;
 633     }
 634
 635     function->value_proc = value_proc;
 636     function->name = name;
 637
 638     *ret = &function->dispex;
 639     return S_OK;
 640 }
 641
 642 static HRESULT set_constructor_prop(script_ctx_t *ctx, jsdisp_t *constr, jsdisp_t *prot)
 643 {
 644     VARIANT v;
 645
 646     static const WCHAR constructorW[] = {'c','o','n','s','t','r','u','c','t','o','r',0};
 647
 648     V_VT(&v) = VT_DISPATCH;
 649     V_DISPATCH(&v) = to_disp(constr);
 650     return jsdisp_propput_dontenum(prot, constructorW, &v);
 651 }
 652
 653 HRESULT create_builtin_constructor(script_ctx_t *ctx, builtin_invoke_t value_proc, const WCHAR *name,
 654         const builtin_info_t *builtin_info, DWORD flags, jsdisp_t *prototype, jsdisp_t **ret)
 655 {
 656     jsdisp_t *constr;
 657     HRESULT hres;
 658
 659     hres = create_builtin_function(ctx, value_proc, name, builtin_info, flags, prototype, &constr);
 660     if(FAILED(hres))
 661         return hres;
 662
 663     hres = set_constructor_prop(ctx, constr, prototype);
 664     if(FAILED(hres)) {
 665         jsdisp_release(constr);
 666         return hres;
 667     }
 668
 669     *ret = constr;
 670     return S_OK;
 671 }
 672
 673 HRESULT create_source_function(script_ctx_t *ctx, bytecode_t *code, function_code_t *func_code,
 674         scope_chain_t *scope_chain, jsdisp_t **ret)
 675 {
 676     FunctionInstance *function;
 677     jsdisp_t *prototype;
 678     HRESULT hres;
 679
 680     hres = create_object(ctx, NULL, &prototype);
 681     if(FAILED(hres))
 682         return hres;
 683
 684     hres = create_function(ctx, NULL, PROPF_CONSTR, FALSE, NULL, &function);
 685     if(SUCCEEDED(hres)) {
 686         hres = set_prototype(ctx, &function->dispex, prototype);
 687         if(SUCCEEDED(hres))
 688             hres = set_constructor_prop(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, unsigned argc, VARIANT *argv, jsexcept_t *ei, IDispatch **ret)
 711 {
 712     WCHAR *str = NULL, *ptr;
 713     DWORD 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     if(argc) {
 725         params = heap_alloc(argc*sizeof(BSTR));
 726         if(!params)
 727             return E_OUTOFMEMORY;
 728
 729         if(argc > 2)
 730             len = (argc-2)*2; /* separating commas */
 731         for(i=0; i < argc; i++) {
 732             hres = to_string(ctx, argv+i, ei, params+i);
 733             if(FAILED(hres))
 734                 break;
 735             len += SysStringLen(params[i]);
 736         }
 737     }
 738
 739     if(SUCCEEDED(hres)) {
 740         len += (sizeof(function_anonymousW) + sizeof(function_beginW) + sizeof(function_endW)) / sizeof(WCHAR);
 741         str = heap_alloc(len*sizeof(WCHAR));
 742         if(str) {
 743             memcpy(str, function_anonymousW, sizeof(function_anonymousW));
 744             ptr = str + sizeof(function_anonymousW)/sizeof(WCHAR);
 745             if(argc > 1) {
 746                 while(1) {
 747                     l = SysStringLen(params[j]);
 748                     memcpy(ptr, params[j], l*sizeof(WCHAR));
 749                     ptr += l;
 750                     if(++j == argc-1)
 751                         break;
 752                     *ptr++ = ',';
 753                     *ptr++ = ' ';
 754                 }
 755             }
 756             memcpy(ptr, function_beginW, sizeof(function_beginW));
 757             ptr += sizeof(function_beginW)/sizeof(WCHAR);
 758             if(argc) {
 759                 l = SysStringLen(params[argc-1]);
 760                 memcpy(ptr, params[argc-1], l*sizeof(WCHAR));
 761                 ptr += l;
 762             }
 763             memcpy(ptr, function_endW, sizeof(function_endW));
 764
 765             TRACE("%s\n", debugstr_w(str));
 766         }else {
 767             hres = E_OUTOFMEMORY;
 768         }
 769     }
 770
 771     while(--i >= 0)
 772         SysFreeString(params[i]);
 773     heap_free(params);
 774     if(FAILED(hres))
 775         return hres;
 776
 777     hres = compile_script(ctx, str, NULL, FALSE, FALSE, &code);
 778     heap_free(str);
 779     if(FAILED(hres))
 780         return hres;
 781
 782     if(code->global_code.func_cnt != 1 || code->global_code.var_cnt) {
 783         ERR("Invalid parser result!\n");
 784         release_bytecode(code);
 785         return E_UNEXPECTED;
 786     }
 787
 788     hres = create_source_function(ctx, code, code->global_code.funcs, NULL, &function);
 789     release_bytecode(code);
 790     if(FAILED(hres))
 791         return hres;
 792
 793     *ret = to_disp(function);
 794     return S_OK;
 795 }
 796
 797 static HRESULT FunctionConstr_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, VARIANT *argv,
 798         VARIANT *retv, jsexcept_t *ei)
 799 {
 800     HRESULT hres;
 801
 802     TRACE("\n");
 803
 804     switch(flags) {
 805     case DISPATCH_CONSTRUCT: {
 806         IDispatch *ret;
 807
 808         hres = construct_function(ctx, argc, argv, ei, &ret);
 809         if(FAILED(hres))
 810             return hres;
 811
 812         V_VT(retv) = VT_DISPATCH;
 813         V_DISPATCH(retv) = ret;
 814         break;
 815     }
 816     default:
 817         FIXME("unimplemented flags %x\n", flags);
 818         return E_NOTIMPL;
 819     }
 820
 821     return S_OK;
 822 }
 823
 824 static HRESULT FunctionProt_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, VARIANT *argv,
 825         VARIANT *retv, jsexcept_t *ei)
 826 {
 827     FIXME("\n");
 828     return E_NOTIMPL;
 829 }
 830
 831 HRESULT init_function_constr(script_ctx_t *ctx, jsdisp_t *object_prototype)
 832 {
 833     FunctionInstance *prot, *constr;
 834     HRESULT hres;
 835
 836     static const WCHAR FunctionW[] = {'F','u','n','c','t','i','o','n',0};
 837
 838     hres = create_function(ctx, NULL, PROPF_CONSTR, TRUE, object_prototype, &prot);
 839     if(FAILED(hres))
 840         return hres;
 841
 842     prot->value_proc = FunctionProt_value;
 843     prot->name = prototypeW;
 844
 845     hres = create_function(ctx, NULL, PROPF_CONSTR|1, TRUE, &prot->dispex, &constr);
 846     if(SUCCEEDED(hres)) {
 847         constr->value_proc = FunctionConstr_value;
 848         constr->name = FunctionW;
 849         hres = set_prototype(ctx, &constr->dispex, &prot->dispex);
 850         if(SUCCEEDED(hres))
 851             hres = set_constructor_prop(ctx, &constr->dispex, &prot->dispex);
 852         if(FAILED(hres))
 853             jsdisp_release(&constr->dispex);
 854     }
 855     jsdisp_release(&prot->dispex);
 856     if(FAILED(hres))
 857         return hres;
 858
 859     ctx->function_constr = &constr->dispex;
 860     return S_OK;
 861 }