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 typedef struct {
  41     jsdisp_t jsdisp;
  42     FunctionInstance *function;
  43     jsdisp_t *var_obj;
  44 } ArgumentsInstance;
  45
  46 static inline FunctionInstance *function_from_jsdisp(jsdisp_t *jsdisp)
  47 {
  48     return CONTAINING_RECORD(jsdisp, FunctionInstance, dispex);
  49 }
  50
  51 static inline FunctionInstance *function_from_vdisp(vdisp_t *vdisp)
  52 {
  53     return function_from_jsdisp(vdisp->u.jsdisp);
  54 }
  55
  56 static inline FunctionInstance *function_this(vdisp_t *jsthis)
  57 {
  58     return is_vclass(jsthis, JSCLASS_FUNCTION) ? function_from_vdisp(jsthis) : NULL;
  59 }
  60
  61 static const WCHAR prototypeW[] = {'p','r','o','t','o','t', 'y', 'p','e',0};
  62
  63 static const WCHAR lengthW[] = {'l','e','n','g','t','h',0};
  64 static const WCHAR toStringW[] = {'t','o','S','t','r','i','n','g',0};
  65 static const WCHAR applyW[] = {'a','p','p','l','y',0};
  66 static const WCHAR callW[] = {'c','a','l','l',0};
  67 static const WCHAR argumentsW[] = {'a','r','g','u','m','e','n','t','s',0};
  68
  69 static HRESULT init_parameters(jsdisp_t *var_disp, FunctionInstance *function, unsigned argc, jsval_t *argv)
  70 {
  71     DWORD i=0;
  72     HRESULT hres;
  73
  74     for(i=0; i < function->func_code->param_cnt; i++) {
  75         hres = jsdisp_propput_name(var_disp, function->func_code->params[i],
  76                 i < argc ? argv[i] : jsval_undefined());
  77         if(FAILED(hres))
  78             return hres;
  79     }
  80
  81     return S_OK;
  82 }
  83
  84 static HRESULT Arguments_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
  85         jsval_t *r)
  86 {
  87     FIXME("\n");
  88     return E_NOTIMPL;
  89 }
  90
  91 static void Arguments_destructor(jsdisp_t *jsdisp)
  92 {
  93     ArgumentsInstance *arguments = (ArgumentsInstance*)jsdisp;
  94
  95     jsdisp_release(&arguments->function->dispex);
  96     jsdisp_release(arguments->var_obj);
  97     heap_free(arguments);
  98 }
  99
 100 static unsigned Arguments_idx_length(jsdisp_t *jsdisp)
 101 {
 102     ArgumentsInstance *arguments = (ArgumentsInstance*)jsdisp;
 103     return arguments->function->length;
 104 }
 105
 106 static HRESULT Arguments_idx_get(jsdisp_t *jsdisp, unsigned idx, jsval_t *res)
 107 {
 108     ArgumentsInstance *arguments = (ArgumentsInstance*)jsdisp;
 109
 110     TRACE("%p[%u]\n", arguments, idx);
 111
 112     /* FIXME: Accessing by name won't work for duplicated argument names */
 113     return jsdisp_propget_name(arguments->var_obj, arguments->function->func_code->params[idx], res);
 114 }
 115
 116 static HRESULT Arguments_idx_put(jsdisp_t *jsdisp, unsigned idx, jsval_t val)
 117 {
 118     ArgumentsInstance *arguments = (ArgumentsInstance*)jsdisp;
 119
 120     TRACE("%p[%u] = %s\n", arguments, idx, debugstr_jsval(val));
 121
 122     /* FIXME: Accessing by name won't work for duplicated argument names */
 123     return jsdisp_propput_name(arguments->var_obj, arguments->function->func_code->params[idx], val);
 124 }
 125
 126 static const builtin_info_t Arguments_info = {
 127     JSCLASS_ARGUMENTS,
 128     {NULL, Arguments_value, 0},
 129     0, NULL,
 130     Arguments_destructor,
 131     NULL,
 132     Arguments_idx_length,
 133     Arguments_idx_get,
 134     Arguments_idx_put
 135 };
 136
 137 static HRESULT create_arguments(script_ctx_t *ctx, FunctionInstance *calee, jsdisp_t *var_obj,
 138         unsigned argc, jsval_t *argv, jsdisp_t **ret)
 139 {
 140     ArgumentsInstance *args;
 141     unsigned i;
 142     HRESULT hres;
 143
 144     static const WCHAR caleeW[] = {'c','a','l','l','e','e',0};
 145
 146     args = heap_alloc_zero(sizeof(*args));
 147     if(!args)
 148         return E_OUTOFMEMORY;
 149
 150     hres = init_dispex_from_constr(&args->jsdisp, ctx, &Arguments_info, ctx->object_constr);
 151     if(FAILED(hres)) {
 152         heap_free(args);
 153         return hres;
 154     }
 155
 156     jsdisp_addref(&calee->dispex);
 157     args->function = calee;
 158     args->var_obj = jsdisp_addref(var_obj);
 159
 160     /* Store unnamed arguments directly in arguments object */
 161     for(i = calee->length; i < argc; i++) {
 162         WCHAR buf[12];
 163
 164         static const WCHAR formatW[] = {'%','d',0};
 165
 166         sprintfW(buf, formatW, i);
 167         hres = jsdisp_propput_dontenum(&args->jsdisp, buf, argv[i]);
 168         if(FAILED(hres))
 169             break;
 170     }
 171
 172     if(SUCCEEDED(hres)) {
 173         hres = jsdisp_propput_dontenum(&args->jsdisp, lengthW, jsval_number(argc));
 174         if(SUCCEEDED(hres))
 175             hres = jsdisp_propput_dontenum(&args->jsdisp, caleeW, jsval_disp(to_disp(&calee->dispex)));
 176     }
 177     if(FAILED(hres)) {
 178         jsdisp_release(&args->jsdisp);
 179         return hres;
 180     }
 181
 182     *ret = &args->jsdisp;
 183     return S_OK;
 184 }
 185
 186 static HRESULT create_var_disp(script_ctx_t *ctx, FunctionInstance *function, unsigned argc, jsval_t *argv, jsdisp_t **ret)
 187 {
 188     jsdisp_t *var_disp;
 189     HRESULT hres;
 190
 191     hres = create_dispex(ctx, NULL, NULL, &var_disp);
 192     if(FAILED(hres))
 193         return hres;
 194
 195     hres = init_parameters(var_disp, function, argc, argv);
 196     if(FAILED(hres)) {
 197         jsdisp_release(var_disp);
 198         return hres;
 199     }
 200
 201     *ret = var_disp;
 202     return S_OK;
 203 }
 204
 205 static HRESULT invoke_source(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_obj, unsigned argc, jsval_t *argv,
 206         jsval_t *r)
 207 {
 208     jsdisp_t *var_disp, *arg_disp;
 209     exec_ctx_t *exec_ctx;
 210     scope_chain_t *scope;
 211     HRESULT hres;
 212
 213     if(ctx->state == SCRIPTSTATE_UNINITIALIZED || ctx->state == SCRIPTSTATE_CLOSED) {
 214         WARN("Script engine state does not allow running code.\n");
 215         return E_UNEXPECTED;
 216     }
 217
 218     if(!function->func_code) {
 219         FIXME("no source\n");
 220         return E_FAIL;
 221     }
 222
 223     hres = create_var_disp(ctx, function, argc, argv, &var_disp);
 224     if(FAILED(hres))
 225         return hres;
 226
 227     hres = create_arguments(ctx, function, var_disp, argc, argv, &arg_disp);
 228     if(FAILED(hres)) {
 229         jsdisp_release(var_disp);
 230         return hres;
 231     }
 232
 233     hres = jsdisp_propput(var_disp, argumentsW, PROPF_DONTDELETE, jsval_obj(arg_disp));
 234     if(FAILED(hres)) {
 235         jsdisp_release(arg_disp);
 236         jsdisp_release(var_disp);
 237         return hres;
 238     }
 239
 240     hres = scope_push(function->scope_chain, var_disp, to_disp(var_disp), &scope);
 241     if(SUCCEEDED(hres)) {
 242         hres = create_exec_ctx(ctx, this_obj, var_disp, scope, FALSE, &exec_ctx);
 243         scope_release(scope);
 244
 245         if(SUCCEEDED(hres)) {
 246             jsdisp_t *prev_args;
 247
 248             prev_args = function->arguments;
 249             function->arguments = arg_disp;
 250             hres = exec_source(exec_ctx, function->code, function->func_code, FALSE, r);
 251             function->arguments = prev_args;
 252
 253             exec_release(exec_ctx);
 254         }
 255     }
 256
 257     /* Reset arguments value to cut the reference cycle. Note that since all activation contexts have
 258      * their own arguments property, it's impossible to use prototype's one during name lookup */
 259     jsdisp_propput_name(var_disp, argumentsW, jsval_undefined());
 260
 261     jsdisp_release(arg_disp);
 262     jsdisp_release(var_disp);
 263     return hres;
 264 }
 265
 266 static HRESULT invoke_constructor(script_ctx_t *ctx, FunctionInstance *function, unsigned argc, jsval_t *argv,
 267         jsval_t *r)
 268 {
 269     jsdisp_t *this_obj;
 270     jsval_t var;
 271     HRESULT hres;
 272
 273     hres = create_object(ctx, &function->dispex, &this_obj);
 274     if(FAILED(hres))
 275         return hres;
 276
 277     hres = invoke_source(ctx, function, to_disp(this_obj), argc, argv, &var);
 278     if(FAILED(hres)) {
 279         jsdisp_release(this_obj);
 280         return hres;
 281     }
 282
 283     if(is_object_instance(var)) {
 284         jsdisp_release(this_obj);
 285         *r = var;
 286     }else {
 287         jsval_release(var);
 288         *r = jsval_obj(this_obj);
 289     }
 290     return S_OK;
 291 }
 292
 293 static HRESULT invoke_value_proc(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_disp, WORD flags,
 294         unsigned argc, jsval_t *argv, jsval_t *r)
 295 {
 296     vdisp_t vthis;
 297     HRESULT hres;
 298
 299     if(this_disp)
 300         set_disp(&vthis, this_disp);
 301     else if(ctx->host_global)
 302         set_disp(&vthis, ctx->host_global);
 303     else
 304         set_jsdisp(&vthis, ctx->global);
 305
 306     hres = function->value_proc(ctx, &vthis, flags, argc, argv, r);
 307
 308     vdisp_release(&vthis);
 309     return hres;
 310 }
 311
 312 static HRESULT call_function(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_obj,
 313         unsigned argc, jsval_t *argv, jsval_t *r)
 314 {
 315     if(function->value_proc)
 316         return invoke_value_proc(ctx, function, this_obj, DISPATCH_METHOD, argc, argv, r);
 317
 318     return invoke_source(ctx, function, this_obj, argc, argv, r);
 319 }
 320
 321 static HRESULT function_to_string(FunctionInstance *function, jsstr_t **ret)
 322 {
 323     jsstr_t *str;
 324
 325     static const WCHAR native_prefixW[] = {'\n','f','u','n','c','t','i','o','n',' '};
 326     static const WCHAR native_suffixW[] =
 327         {'(',')',' ','{','\n',' ',' ',' ',' ','[','n','a','t','i','v','e',' ','c','o','d','e',']','\n','}','\n'};
 328
 329     if(function->value_proc) {
 330         DWORD name_len;
 331         WCHAR *ptr;
 332
 333         name_len = strlenW(function->name);
 334         ptr = jsstr_alloc_buf((sizeof(native_prefixW)+sizeof(native_suffixW))/sizeof(WCHAR) + name_len, &str);
 335         if(!ptr)
 336             return E_OUTOFMEMORY;
 337
 338         memcpy(ptr, native_prefixW, sizeof(native_prefixW));
 339         memcpy(ptr += sizeof(native_prefixW)/sizeof(WCHAR), function->name, name_len*sizeof(WCHAR));
 340         memcpy(ptr + name_len, native_suffixW, sizeof(native_suffixW));
 341     }else {
 342         str = jsstr_alloc_len(function->func_code->source, function->func_code->source_len);
 343         if(!str)
 344             return E_OUTOFMEMORY;
 345     }
 346
 347     *ret = str;
 348     return S_OK;
 349 }
 350
 351 HRESULT Function_invoke(jsdisp_t *func_this, IDispatch *jsthis, WORD flags, unsigned argc, jsval_t *argv, jsval_t *r)
 352 {
 353     FunctionInstance *function;
 354
 355     TRACE("func %p this %p\n", func_this, jsthis);
 356
 357     assert(is_class(func_this, JSCLASS_FUNCTION));
 358     function = (FunctionInstance*)func_this;
 359
 360     if(function->value_proc)
 361         return invoke_value_proc(function->dispex.ctx, function, jsthis, flags, argc, argv, r);
 362
 363     if(flags == DISPATCH_CONSTRUCT)
 364         return invoke_constructor(function->dispex.ctx, function, argc, argv, r);
 365
 366     assert(flags == DISPATCH_METHOD);
 367     return invoke_source(function->dispex.ctx, function, jsthis, argc, argv, r);
 368 }
 369
 370 static HRESULT Function_get_length(script_ctx_t *ctx, jsdisp_t *jsthis, jsval_t *r)
 371 {
 372     TRACE("%p\n", jsthis);
 373
 374     *r = jsval_number(function_from_jsdisp(jsthis)->length);
 375     return S_OK;
 376 }
 377
 378 static HRESULT Function_set_length(script_ctx_t *ctx, jsdisp_t *jsthis, jsval_t value)
 379 {
 380     FIXME("\n");
 381     return E_NOTIMPL;
 382 }
 383
 384 static HRESULT Function_toString(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
 385         jsval_t *r)
 386 {
 387     FunctionInstance *function;
 388     jsstr_t *str;
 389     HRESULT hres;
 390
 391     TRACE("\n");
 392
 393     if(!(function = function_this(jsthis)))
 394         return throw_type_error(ctx, JS_E_FUNCTION_EXPECTED, NULL);
 395
 396     hres = function_to_string(function, &str);
 397     if(FAILED(hres))
 398         return hres;
 399
 400     if(r)
 401         *r = jsval_string(str);
 402     else
 403         jsstr_release(str);
 404     return S_OK;
 405 }
 406
 407 static HRESULT array_to_args(script_ctx_t *ctx, jsdisp_t *arg_array, unsigned *argc, jsval_t **ret)
 408 {
 409     jsval_t *argv, val;
 410     DWORD length, i;
 411     HRESULT hres;
 412
 413     hres = jsdisp_propget_name(arg_array, lengthW, &val);
 414     if(FAILED(hres))
 415         return hres;
 416
 417     hres = to_uint32(ctx, val, &length);
 418     jsval_release(val);
 419     if(FAILED(hres))
 420         return hres;
 421
 422     argv = heap_alloc(length * sizeof(*argv));
 423     if(!argv)
 424         return E_OUTOFMEMORY;
 425
 426     for(i=0; i<length; i++) {
 427         hres = jsdisp_get_idx(arg_array, i, argv+i);
 428         if(hres == DISP_E_UNKNOWNNAME) {
 429             argv[i] = jsval_undefined();
 430         }else if(FAILED(hres)) {
 431             while(i--)
 432                 jsval_release(argv[i]);
 433             heap_free(argv);
 434             return hres;
 435         }
 436     }
 437
 438     *argc = length;
 439     *ret = argv;
 440     return S_OK;
 441 }
 442
 443 static HRESULT Function_apply(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv, jsval_t *r)
 444 {
 445     FunctionInstance *function;
 446     jsval_t *args = NULL;
 447     unsigned i, cnt = 0;
 448     IDispatch *this_obj = NULL;
 449     HRESULT hres = S_OK;
 450
 451     TRACE("\n");
 452
 453     if(!(function = function_this(jsthis)))
 454         return throw_type_error(ctx, JS_E_FUNCTION_EXPECTED, NULL);
 455
 456     if(argc) {
 457         if(!is_undefined(argv[0]) && !is_null(argv[0])) {
 458             hres = to_object(ctx, argv[0], &this_obj);
 459             if(FAILED(hres))
 460                 return hres;
 461         }
 462     }
 463
 464     if(argc >= 2) {
 465         jsdisp_t *arg_array = NULL;
 466
 467         if(is_object_instance(argv[1])) {
 468             arg_array = iface_to_jsdisp((IUnknown*)get_object(argv[1]));
 469             if(arg_array &&
 470                (!is_class(arg_array, JSCLASS_ARRAY) && !is_class(arg_array, JSCLASS_ARGUMENTS) )) {
 471                 jsdisp_release(arg_array);
 472                 arg_array = NULL;
 473             }
 474         }
 475
 476         if(arg_array) {
 477             hres = array_to_args(ctx, arg_array, &cnt, &args);
 478             jsdisp_release(arg_array);
 479         }else {
 480             FIXME("throw TypeError\n");
 481             hres = E_FAIL;
 482         }
 483     }
 484
 485     if(SUCCEEDED(hres))
 486         hres = call_function(ctx, function, this_obj, cnt, args, r);
 487
 488     if(this_obj)
 489         IDispatch_Release(this_obj);
 490     for(i=0; i < cnt; i++)
 491         jsval_release(args[i]);
 492     heap_free(args);
 493     return hres;
 494 }
 495
 496 static HRESULT Function_call(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
 497         jsval_t *r)
 498 {
 499     FunctionInstance *function;
 500     IDispatch *this_obj = NULL;
 501     unsigned cnt = 0;
 502     HRESULT hres;
 503
 504     TRACE("\n");
 505
 506     if(!(function = function_this(jsthis)))
 507         return throw_type_error(ctx, JS_E_FUNCTION_EXPECTED, NULL);
 508
 509     if(argc) {
 510         if(!is_undefined(argv[0]) && !is_null(argv[0])) {
 511             hres = to_object(ctx, argv[0], &this_obj);
 512             if(FAILED(hres))
 513                 return hres;
 514         }
 515
 516         cnt = argc-1;
 517     }
 518
 519     hres = call_function(ctx, function, this_obj, cnt, argv+1, r);
 520
 521     if(this_obj)
 522         IDispatch_Release(this_obj);
 523     return hres;
 524 }
 525
 526 HRESULT Function_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
 527         jsval_t *r)
 528 {
 529     FunctionInstance *function;
 530
 531     TRACE("\n");
 532
 533     if(!is_vclass(jsthis, JSCLASS_FUNCTION)) {
 534         ERR("dispex is not a function\n");
 535         return E_FAIL;
 536     }
 537
 538     function = (FunctionInstance*)jsthis->u.jsdisp;
 539
 540     assert(function->value_proc != NULL);
 541     return invoke_value_proc(ctx, function, NULL, flags, argc, argv, r);
 542 }
 543
 544 HRESULT Function_get_value(script_ctx_t *ctx, jsdisp_t *jsthis, jsval_t *r)
 545 {
 546     jsstr_t *str;
 547     HRESULT hres;
 548
 549     TRACE("\n");
 550
 551     hres = function_to_string(function_from_jsdisp(jsthis), &str);
 552     if(FAILED(hres))
 553         return hres;
 554
 555     *r = jsval_string(str);
 556     return S_OK;
 557 }
 558
 559 static HRESULT Function_get_arguments(script_ctx_t *ctx, jsdisp_t *jsthis, jsval_t *r)
 560 {
 561     FunctionInstance *function = function_from_jsdisp(jsthis);
 562
 563     TRACE("\n");
 564
 565     *r = function->arguments ? jsval_obj(jsdisp_addref(function->arguments)) : jsval_null();
 566     return S_OK;
 567 }
 568
 569 static void Function_destructor(jsdisp_t *dispex)
 570 {
 571     FunctionInstance *This = (FunctionInstance*)dispex;
 572
 573     if(This->code)
 574         release_bytecode(This->code);
 575     if(This->scope_chain)
 576         scope_release(This->scope_chain);
 577     heap_free(This);
 578 }
 579
 580 static const builtin_prop_t Function_props[] = {
 581     {applyW,                 Function_apply,                 PROPF_METHOD|2},
 582     {argumentsW,             NULL, 0,                        Function_get_arguments, builtin_set_const},
 583     {callW,                  Function_call,                  PROPF_METHOD|1},
 584     {lengthW,                NULL, 0,                        Function_get_length,    Function_set_length},
 585     {toStringW,              Function_toString,              PROPF_METHOD}
 586 };
 587
 588 static const builtin_info_t Function_info = {
 589     JSCLASS_FUNCTION,
 590     DEFAULT_FUNCTION_VALUE,
 591     sizeof(Function_props)/sizeof(*Function_props),
 592     Function_props,
 593     Function_destructor,
 594     NULL
 595 };
 596
 597 static const builtin_prop_t FunctionInst_props[] = {
 598     {argumentsW,             NULL, 0,                        Function_get_arguments, builtin_set_const},
 599     {lengthW,                NULL, 0,                        Function_get_length,    Function_set_length}
 600 };
 601
 602 static const builtin_info_t FunctionInst_info = {
 603     JSCLASS_FUNCTION,
 604     DEFAULT_FUNCTION_VALUE,
 605     sizeof(FunctionInst_props)/sizeof(*FunctionInst_props),
 606     FunctionInst_props,
 607     Function_destructor,
 608     NULL
 609 };
 610
 611 static HRESULT create_function(script_ctx_t *ctx, const builtin_info_t *builtin_info, DWORD flags,
 612         BOOL funcprot, jsdisp_t *prototype, FunctionInstance **ret)
 613 {
 614     FunctionInstance *function;
 615     HRESULT hres;
 616
 617     function = heap_alloc_zero(sizeof(FunctionInstance));
 618     if(!function)
 619         return E_OUTOFMEMORY;
 620
 621     if(funcprot)
 622         hres = init_dispex(&function->dispex, ctx, builtin_info, prototype);
 623     else if(builtin_info)
 624         hres = init_dispex_from_constr(&function->dispex, ctx, builtin_info, ctx->function_constr);
 625     else
 626         hres = init_dispex_from_constr(&function->dispex, ctx, &FunctionInst_info, ctx->function_constr);
 627     if(FAILED(hres)) {
 628         heap_free(function);
 629         return hres;
 630     }
 631
 632     function->flags = flags;
 633     function->length = flags & PROPF_ARGMASK;
 634
 635     *ret = function;
 636     return S_OK;
 637 }
 638
 639 static inline HRESULT set_prototype(script_ctx_t *ctx, jsdisp_t *dispex, jsdisp_t *prototype)
 640 {
 641     return jsdisp_propput_dontenum(dispex, prototypeW, jsval_obj(prototype));
 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         hres = jsdisp_propput_const(&function->dispex, lengthW, jsval_number(function->length));
 656     if(SUCCEEDED(hres))
 657         hres = set_prototype(ctx, &function->dispex, prototype);
 658     if(FAILED(hres)) {
 659         jsdisp_release(&function->dispex);
 660         return hres;
 661     }
 662
 663     function->value_proc = value_proc;
 664     function->name = name;
 665
 666     *ret = &function->dispex;
 667     return S_OK;
 668 }
 669
 670 static HRESULT set_constructor_prop(script_ctx_t *ctx, jsdisp_t *constr, jsdisp_t *prot)
 671 {
 672     static const WCHAR constructorW[] = {'c','o','n','s','t','r','u','c','t','o','r',0};
 673
 674     return jsdisp_propput_dontenum(prot, constructorW, jsval_obj(constr));
 675 }
 676
 677 HRESULT create_builtin_constructor(script_ctx_t *ctx, builtin_invoke_t value_proc, const WCHAR *name,
 678         const builtin_info_t *builtin_info, DWORD flags, jsdisp_t *prototype, jsdisp_t **ret)
 679 {
 680     jsdisp_t *constr;
 681     HRESULT hres;
 682
 683     hres = create_builtin_function(ctx, value_proc, name, builtin_info, flags, prototype, &constr);
 684     if(FAILED(hres))
 685         return hres;
 686
 687     hres = set_constructor_prop(ctx, constr, prototype);
 688     if(FAILED(hres)) {
 689         jsdisp_release(constr);
 690         return hres;
 691     }
 692
 693     *ret = constr;
 694     return S_OK;
 695 }
 696
 697 HRESULT create_source_function(script_ctx_t *ctx, bytecode_t *code, function_code_t *func_code,
 698         scope_chain_t *scope_chain, jsdisp_t **ret)
 699 {
 700     FunctionInstance *function;
 701     jsdisp_t *prototype;
 702     HRESULT hres;
 703
 704     hres = create_object(ctx, NULL, &prototype);
 705     if(FAILED(hres))
 706         return hres;
 707
 708     hres = create_function(ctx, NULL, PROPF_CONSTR, FALSE, NULL, &function);
 709     if(SUCCEEDED(hres)) {
 710         hres = set_prototype(ctx, &function->dispex, prototype);
 711         if(SUCCEEDED(hres))
 712             hres = set_constructor_prop(ctx, &function->dispex, prototype);
 713         if(FAILED(hres))
 714             jsdisp_release(&function->dispex);
 715     }
 716     jsdisp_release(prototype);
 717     if(FAILED(hres))
 718         return hres;
 719
 720     if(scope_chain) {
 721         scope_addref(scope_chain);
 722         function->scope_chain = scope_chain;
 723     }
 724
 725     bytecode_addref(code);
 726     function->code = code;
 727     function->func_code = func_code;
 728     function->length = function->func_code->param_cnt;
 729
 730     *ret = &function->dispex;
 731     return S_OK;
 732 }
 733
 734 static HRESULT construct_function(script_ctx_t *ctx, unsigned argc, jsval_t *argv, IDispatch **ret)
 735 {
 736     WCHAR *str = NULL, *ptr;
 737     unsigned len = 0, i = 0;
 738     bytecode_t *code;
 739     jsdisp_t *function;
 740     jsstr_t **params = NULL;
 741     int j = 0;
 742     HRESULT hres = S_OK;
 743
 744     static const WCHAR function_anonymousW[] = {'f','u','n','c','t','i','o','n',' ','a','n','o','n','y','m','o','u','s','('};
 745     static const WCHAR function_beginW[] = {')',' ','{','\n'};
 746     static const WCHAR function_endW[] = {'\n','}',0};
 747
 748     if(argc) {
 749         params = heap_alloc(argc*sizeof(*params));
 750         if(!params)
 751             return E_OUTOFMEMORY;
 752
 753         if(argc > 2)
 754             len = (argc-2)*2; /* separating commas */
 755         for(i=0; i < argc; i++) {
 756             hres = to_string(ctx, argv[i], params+i);
 757             if(FAILED(hres))
 758                 break;
 759             len += jsstr_length(params[i]);
 760         }
 761     }
 762
 763     if(SUCCEEDED(hres)) {
 764         len += (sizeof(function_anonymousW) + sizeof(function_beginW) + sizeof(function_endW)) / sizeof(WCHAR);
 765         str = heap_alloc(len*sizeof(WCHAR));
 766         if(str) {
 767             memcpy(str, function_anonymousW, sizeof(function_anonymousW));
 768             ptr = str + sizeof(function_anonymousW)/sizeof(WCHAR);
 769             if(argc > 1) {
 770                 while(1) {
 771                     ptr += jsstr_flush(params[j], ptr);
 772                     if(++j == argc-1)
 773                         break;
 774                     *ptr++ = ',';
 775                     *ptr++ = ' ';
 776                 }
 777             }
 778             memcpy(ptr, function_beginW, sizeof(function_beginW));
 779             ptr += sizeof(function_beginW)/sizeof(WCHAR);
 780             if(argc)
 781                 ptr += jsstr_flush(params[argc-1], ptr);
 782             memcpy(ptr, function_endW, sizeof(function_endW));
 783
 784             TRACE("%s\n", debugstr_w(str));
 785         }else {
 786             hres = E_OUTOFMEMORY;
 787         }
 788     }
 789
 790     while(i)
 791         jsstr_release(params[--i]);
 792     heap_free(params);
 793     if(FAILED(hres))
 794         return hres;
 795
 796     hres = compile_script(ctx, str, NULL, NULL, FALSE, FALSE, &code);
 797     heap_free(str);
 798     if(FAILED(hres))
 799         return hres;
 800
 801     if(code->global_code.func_cnt != 1 || code->global_code.var_cnt) {
 802         ERR("Invalid parser result!\n");
 803         release_bytecode(code);
 804         return E_UNEXPECTED;
 805     }
 806
 807     hres = create_source_function(ctx, code, code->global_code.funcs, NULL, &function);
 808     release_bytecode(code);
 809     if(FAILED(hres))
 810         return hres;
 811
 812     *ret = to_disp(function);
 813     return S_OK;
 814 }
 815
 816 static HRESULT FunctionConstr_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
 817         jsval_t *r)
 818 {
 819     HRESULT hres;
 820
 821     TRACE("\n");
 822
 823     switch(flags) {
 824     case DISPATCH_CONSTRUCT: {
 825         IDispatch *ret;
 826
 827         hres = construct_function(ctx, argc, argv, &ret);
 828         if(FAILED(hres))
 829             return hres;
 830
 831         *r = jsval_disp(ret);
 832         break;
 833     }
 834     default:
 835         FIXME("unimplemented flags %x\n", flags);
 836         return E_NOTIMPL;
 837     }
 838
 839     return S_OK;
 840 }
 841
 842 static HRESULT FunctionProt_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
 843         jsval_t *r)
 844 {
 845     FIXME("\n");
 846     return E_NOTIMPL;
 847 }
 848
 849 HRESULT init_function_constr(script_ctx_t *ctx, jsdisp_t *object_prototype)
 850 {
 851     FunctionInstance *prot, *constr;
 852     HRESULT hres;
 853
 854     static const WCHAR FunctionW[] = {'F','u','n','c','t','i','o','n',0};
 855
 856     hres = create_function(ctx, &Function_info, PROPF_CONSTR, TRUE, object_prototype, &prot);
 857     if(FAILED(hres))
 858         return hres;
 859
 860     prot->value_proc = FunctionProt_value;
 861     prot->name = prototypeW;
 862
 863     hres = create_function(ctx, &FunctionInst_info, PROPF_CONSTR|1, TRUE, &prot->dispex, &constr);
 864     if(SUCCEEDED(hres)) {
 865         constr->value_proc = FunctionConstr_value;
 866         constr->name = FunctionW;
 867         hres = set_prototype(ctx, &constr->dispex, &prot->dispex);
 868         if(SUCCEEDED(hres))
 869             hres = set_constructor_prop(ctx, &constr->dispex, &prot->dispex);
 870         if(FAILED(hres))
 871             jsdisp_release(&constr->dispex);
 872     }
 873     jsdisp_release(&prot->dispex);
 874     if(FAILED(hres))
 875         return hres;
 876
 877     ctx->function_constr = &constr->dispex;
 878     return S_OK;
 879 }