reactos/dll/win32/jscript/function.c

   1 /*
   2  * Copyright 2008 Jacek Caban for CodeWeavers
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  */
  18
  19 #include "jscript.h"
  20
  21 typedef struct {
  22     jsdisp_t dispex;
  23     builtin_invoke_t value_proc;
  24     const WCHAR *name;
  25     DWORD flags;
  26     scope_chain_t *scope_chain;
  27     bytecode_t *code;
  28     function_code_t *func_code;
  29     DWORD length;
  30 } FunctionInstance;
  31
  32 typedef struct {
  33     jsdisp_t jsdisp;
  34     FunctionInstance *function;
  35     jsval_t *buf;
  36     call_frame_t *frame;
  37     unsigned argc;
  38 } ArgumentsInstance;
  39
  40 static inline FunctionInstance *function_from_jsdisp(jsdisp_t *jsdisp)
  41 {
  42     return CONTAINING_RECORD(jsdisp, FunctionInstance, dispex);
  43 }
  44
  45 static inline FunctionInstance *function_from_vdisp(vdisp_t *vdisp)
  46 {
  47     return function_from_jsdisp(vdisp->u.jsdisp);
  48 }
  49
  50 static inline FunctionInstance *function_this(vdisp_t *jsthis)
  51 {
  52     return is_vclass(jsthis, JSCLASS_FUNCTION) ? function_from_vdisp(jsthis) : NULL;
  53 }
  54
  55 static inline ArgumentsInstance *arguments_from_jsdisp(jsdisp_t *jsdisp)
  56 {
  57     return CONTAINING_RECORD(jsdisp, ArgumentsInstance, jsdisp);
  58 }
  59
  60 static const WCHAR prototypeW[] = {'p','r','o','t','o','t', 'y', 'p','e',0};
  61
  62 static const WCHAR lengthW[] = {'l','e','n','g','t','h',0};
  63 static const WCHAR toStringW[] = {'t','o','S','t','r','i','n','g',0};
  64 static const WCHAR applyW[] = {'a','p','p','l','y',0};
  65 static const WCHAR callW[] = {'c','a','l','l',0};
  66 static const WCHAR argumentsW[] = {'a','r','g','u','m','e','n','t','s',0};
  67
  68 static HRESULT Arguments_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
  69         jsval_t *r)
  70 {
  71     FIXME("\n");
  72     return E_NOTIMPL;
  73 }
  74
  75 static void Arguments_destructor(jsdisp_t *jsdisp)
  76 {
  77     ArgumentsInstance *arguments = (ArgumentsInstance*)jsdisp;
  78
  79     TRACE("(%p)\n", arguments);
  80
  81     if(arguments->buf) {
  82         unsigned i;
  83         for(i = 0; i < arguments->argc; i++)
  84             jsval_release(arguments->buf[i]);
  85         heap_free(arguments->buf);
  86     }
  87
  88     jsdisp_release(&arguments->function->dispex);
  89     heap_free(arguments);
  90 }
  91
  92 static unsigned Arguments_idx_length(jsdisp_t *jsdisp)
  93 {
  94     ArgumentsInstance *arguments = (ArgumentsInstance*)jsdisp;
  95     return arguments->argc;
  96 }
  97
  98 static jsval_t *get_argument_ref(ArgumentsInstance *arguments, unsigned idx)
  99 {
 100     if(arguments->buf)
 101         return arguments->buf + idx;
 102     if(arguments->frame->base_scope->frame || idx >= arguments->frame->function->param_cnt)
 103         return arguments->jsdisp.ctx->stack + arguments->frame->arguments_off + idx;
 104     return NULL;
 105 }
 106
 107 static HRESULT Arguments_idx_get(jsdisp_t *jsdisp, unsigned idx, jsval_t *r)
 108 {
 109     ArgumentsInstance *arguments = (ArgumentsInstance*)jsdisp;
 110     jsval_t *ref;
 111
 112     TRACE("%p[%u]\n", arguments, idx);
 113
 114     if((ref = get_argument_ref(arguments, idx)))
 115         return jsval_copy(*ref, r);
 116
 117     /* FIXME: Accessing by name won't work for duplicated argument names */
 118     return jsdisp_propget_name(arguments->frame->base_scope->jsobj, arguments->function->func_code->params[idx], r);
 119 }
 120
 121 static HRESULT Arguments_idx_put(jsdisp_t *jsdisp, unsigned idx, jsval_t val)
 122 {
 123     ArgumentsInstance *arguments = (ArgumentsInstance*)jsdisp;
 124     jsval_t *ref;
 125     HRESULT hres;
 126
 127     TRACE("%p[%u] = %s\n", arguments, idx, debugstr_jsval(val));
 128
 129     if((ref = get_argument_ref(arguments, idx))) {
 130         jsval_t copy;
 131         hres = jsval_copy(val, &copy);
 132         if(FAILED(hres))
 133             return hres;
 134
 135         jsval_release(*ref);
 136         *ref = copy;
 137         return S_OK;
 138     }
 139
 140     /* FIXME: Accessing by name won't work for duplicated argument names */
 141     return jsdisp_propput_name(arguments->frame->base_scope->jsobj, arguments->function->func_code->params[idx], val);
 142 }
 143
 144 static const builtin_info_t Arguments_info = {
 145     JSCLASS_ARGUMENTS,
 146     {NULL, Arguments_value, 0},
 147     0, NULL,
 148     Arguments_destructor,
 149     NULL,
 150     Arguments_idx_length,
 151     Arguments_idx_get,
 152     Arguments_idx_put
 153 };
 154
 155 HRESULT setup_arguments_object(script_ctx_t *ctx, call_frame_t *frame)
 156 {
 157     ArgumentsInstance *args;
 158     HRESULT hres;
 159
 160     static const WCHAR caleeW[] = {'c','a','l','l','e','e',0};
 161
 162     args = heap_alloc_zero(sizeof(*args));
 163     if(!args)
 164         return E_OUTOFMEMORY;
 165
 166     hres = init_dispex_from_constr(&args->jsdisp, ctx, &Arguments_info, ctx->object_constr);
 167     if(FAILED(hres)) {
 168         heap_free(args);
 169         return hres;
 170     }
 171
 172     args->function = function_from_jsdisp(jsdisp_addref(frame->function_instance));
 173     args->argc = frame->argc;
 174     args->frame = frame;
 175
 176     hres = jsdisp_propput_dontenum(&args->jsdisp, lengthW, jsval_number(args->argc));
 177     if(SUCCEEDED(hres))
 178         hres = jsdisp_propput_dontenum(&args->jsdisp, caleeW, jsval_disp(to_disp(&args->function->dispex)));
 179     if(SUCCEEDED(hres))
 180         hres = jsdisp_propput(frame->base_scope->jsobj, argumentsW, PROPF_DONTDELETE, jsval_obj(&args->jsdisp));
 181     if(FAILED(hres)) {
 182         jsdisp_release(&args->jsdisp);
 183         return hres;
 184     }
 185
 186     frame->arguments_obj = &args->jsdisp;
 187     return S_OK;
 188 }
 189
 190 void detach_arguments_object(jsdisp_t *args_disp)
 191 {
 192     ArgumentsInstance *arguments = arguments_from_jsdisp(args_disp);
 193     call_frame_t *frame = arguments->frame;
 194     const BOOL on_stack = frame->base_scope->frame == frame;
 195     HRESULT hres;
 196
 197     /* Reset arguments value to cut the reference cycle. Note that since all activation contexts have
 198      * their own arguments property, it's impossible to use prototype's one during name lookup */
 199     jsdisp_propput_name(frame->base_scope->jsobj, argumentsW, jsval_undefined());
 200     arguments->frame = NULL;
 201
 202     /* Don't bother coppying arguments if call frame holds the last reference. */
 203     if(arguments->jsdisp.ref > 1) {
 204         arguments->buf = heap_alloc(arguments->argc * sizeof(*arguments->buf));
 205         if(arguments->buf) {
 206             int i;
 207
 208             for(i = 0; i < arguments->argc ; i++) {
 209                 if(on_stack || i >= frame->function->param_cnt)
 210                     hres = jsval_copy(arguments->jsdisp.ctx->stack[frame->arguments_off + i], arguments->buf+i);
 211                 else
 212                     hres = jsdisp_propget_name(frame->base_scope->jsobj, frame->function->params[i], arguments->buf+i);
 213                 if(FAILED(hres))
 214                     arguments->buf[i] = jsval_undefined();
 215             }
 216         }else {
 217             ERR("out of memory\n");
 218             arguments->argc = 0;
 219         }
 220     }
 221
 222     jsdisp_release(frame->arguments_obj);
 223 }
 224
 225 static HRESULT invoke_source(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_obj, unsigned argc, jsval_t *argv,
 226         BOOL is_constructor, BOOL caller_execs_source, jsval_t *r)
 227 {
 228     jsdisp_t *var_disp;
 229     DWORD exec_flags = 0;
 230     HRESULT hres;
 231
 232     if(ctx->state == SCRIPTSTATE_UNINITIALIZED || ctx->state == SCRIPTSTATE_CLOSED) {
 233         WARN("Script engine state does not allow running code.\n");
 234         return E_UNEXPECTED;
 235     }
 236
 237     if(!function->func_code) {
 238         FIXME("no source\n");
 239         return E_FAIL;
 240     }
 241
 242     hres = create_dispex(ctx, NULL, NULL, &var_disp);
 243     if(FAILED(hres))
 244         return hres;
 245
 246     if(caller_execs_source)
 247         exec_flags |= EXEC_RETURN_TO_INTERP;
 248     if(is_constructor)
 249         exec_flags |= EXEC_CONSTRUCTOR;
 250     hres = exec_source(ctx, exec_flags, function->code, function->func_code, function->scope_chain, this_obj,
 251             &function->dispex, var_disp, argc, argv, r);
 252
 253     jsdisp_release(var_disp);
 254     return hres;
 255 }
 256
 257 static HRESULT invoke_value_proc(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_disp, WORD flags,
 258         unsigned argc, jsval_t *argv, jsval_t *r)
 259 {
 260     vdisp_t vthis;
 261     HRESULT hres;
 262
 263     if(this_disp)
 264         set_disp(&vthis, this_disp);
 265     else if(ctx->host_global)
 266         set_disp(&vthis, ctx->host_global);
 267     else
 268         set_jsdisp(&vthis, ctx->global);
 269
 270     hres = function->value_proc(ctx, &vthis, flags, argc, argv, r);
 271
 272     vdisp_release(&vthis);
 273     return hres;
 274 }
 275
 276 static HRESULT call_function(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_obj,
 277         unsigned argc, jsval_t *argv, BOOL caller_execs_source, jsval_t *r)
 278 {
 279     if(function->value_proc)
 280         return invoke_value_proc(ctx, function, this_obj, DISPATCH_METHOD, argc, argv, r);
 281
 282     return invoke_source(ctx, function, this_obj, argc, argv, FALSE, caller_execs_source, r);
 283 }
 284
 285 static HRESULT function_to_string(FunctionInstance *function, jsstr_t **ret)
 286 {
 287     jsstr_t *str;
 288
 289     static const WCHAR native_prefixW[] = {'\n','f','u','n','c','t','i','o','n',' '};
 290     static const WCHAR native_suffixW[] =
 291         {'(',')',' ','{','\n',' ',' ',' ',' ','[','n','a','t','i','v','e',' ','c','o','d','e',']','\n','}','\n'};
 292
 293     if(function->value_proc) {
 294         DWORD name_len;
 295         WCHAR *ptr;
 296
 297         name_len = strlenW(function->name);
 298         ptr = jsstr_alloc_buf((sizeof(native_prefixW)+sizeof(native_suffixW))/sizeof(WCHAR) + name_len, &str);
 299         if(!ptr)
 300             return E_OUTOFMEMORY;
 301
 302         memcpy(ptr, native_prefixW, sizeof(native_prefixW));
 303         memcpy(ptr += sizeof(native_prefixW)/sizeof(WCHAR), function->name, name_len*sizeof(WCHAR));
 304         memcpy(ptr + name_len, native_suffixW, sizeof(native_suffixW));
 305     }else {
 306         str = jsstr_alloc_len(function->func_code->source, function->func_code->source_len);
 307         if(!str)
 308             return E_OUTOFMEMORY;
 309     }
 310
 311     *ret = str;
 312     return S_OK;
 313 }
 314
 315 HRESULT Function_invoke(jsdisp_t *func_this, IDispatch *jsthis, WORD flags, unsigned argc, jsval_t *argv, jsval_t *r)
 316 {
 317     const BOOL caller_execs_source = (flags & DISPATCH_JSCRIPT_CALLEREXECSSOURCE) != 0;
 318     FunctionInstance *function;
 319
 320     TRACE("func %p this %p\n", func_this, jsthis);
 321
 322     assert(is_class(func_this, JSCLASS_FUNCTION));
 323     function = (FunctionInstance*)func_this;
 324
 325     flags &= ~DISPATCH_JSCRIPT_INTERNAL_MASK;
 326     if(function->value_proc)
 327         return invoke_value_proc(function->dispex.ctx, function, jsthis, flags, argc, argv, r);
 328
 329     if(flags == DISPATCH_CONSTRUCT) {
 330         jsdisp_t *this_obj;
 331         HRESULT hres;
 332
 333         hres = create_object(function->dispex.ctx, &function->dispex, &this_obj);
 334         if(FAILED(hres))
 335             return hres;
 336
 337         hres = invoke_source(function->dispex.ctx, function, to_disp(this_obj), argc, argv, TRUE, caller_execs_source, r);
 338         jsdisp_release(this_obj);
 339         return hres;
 340     }
 341
 342     assert(flags == DISPATCH_METHOD);
 343     return invoke_source(function->dispex.ctx, function, jsthis, argc, argv, FALSE, caller_execs_source, r);
 344 }
 345
 346 static HRESULT Function_get_length(script_ctx_t *ctx, jsdisp_t *jsthis, jsval_t *r)
 347 {
 348     TRACE("%p\n", jsthis);
 349
 350     *r = jsval_number(function_from_jsdisp(jsthis)->length);
 351     return S_OK;
 352 }
 353
 354 static HRESULT Function_set_length(script_ctx_t *ctx, jsdisp_t *jsthis, jsval_t value)
 355 {
 356     FIXME("\n");
 357     return E_NOTIMPL;
 358 }
 359
 360 static HRESULT Function_toString(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
 361         jsval_t *r)
 362 {
 363     FunctionInstance *function;
 364     jsstr_t *str;
 365     HRESULT hres;
 366
 367     TRACE("\n");
 368
 369     if(!(function = function_this(jsthis)))
 370         return throw_type_error(ctx, JS_E_FUNCTION_EXPECTED, NULL);
 371
 372     hres = function_to_string(function, &str);
 373     if(FAILED(hres))
 374         return hres;
 375
 376     if(r)
 377         *r = jsval_string(str);
 378     else
 379         jsstr_release(str);
 380     return S_OK;
 381 }
 382
 383 static HRESULT array_to_args(script_ctx_t *ctx, jsdisp_t *arg_array, unsigned *argc, jsval_t **ret)
 384 {
 385     jsval_t *argv, val;
 386     DWORD length, i;
 387     HRESULT hres;
 388
 389     hres = jsdisp_propget_name(arg_array, lengthW, &val);
 390     if(FAILED(hres))
 391         return hres;
 392
 393     hres = to_uint32(ctx, val, &length);
 394     jsval_release(val);
 395     if(FAILED(hres))
 396         return hres;
 397
 398     argv = heap_alloc(length * sizeof(*argv));
 399     if(!argv)
 400         return E_OUTOFMEMORY;
 401
 402     for(i=0; i<length; i++) {
 403         hres = jsdisp_get_idx(arg_array, i, argv+i);
 404         if(hres == DISP_E_UNKNOWNNAME) {
 405             argv[i] = jsval_undefined();
 406         }else if(FAILED(hres)) {
 407             while(i--)
 408                 jsval_release(argv[i]);
 409             heap_free(argv);
 410             return hres;
 411         }
 412     }
 413
 414     *argc = length;
 415     *ret = argv;
 416     return S_OK;
 417 }
 418
 419 static HRESULT Function_apply(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv, jsval_t *r)
 420 {
 421     FunctionInstance *function;
 422     jsval_t *args = NULL;
 423     unsigned i, cnt = 0;
 424     IDispatch *this_obj = NULL;
 425     HRESULT hres = S_OK;
 426
 427     TRACE("\n");
 428
 429     if(!(function = function_this(jsthis)) && (jsthis->flags & VDISP_JSDISP))
 430         return throw_type_error(ctx, JS_E_FUNCTION_EXPECTED, NULL);
 431
 432     if(argc) {
 433         if(!is_undefined(argv[0]) && !is_null(argv[0])) {
 434             hres = to_object(ctx, argv[0], &this_obj);
 435             if(FAILED(hres))
 436                 return hres;
 437         }
 438     }
 439
 440     if(argc >= 2) {
 441         jsdisp_t *arg_array = NULL;
 442
 443         if(is_object_instance(argv[1])) {
 444             arg_array = iface_to_jsdisp(get_object(argv[1]));
 445             if(arg_array &&
 446                (!is_class(arg_array, JSCLASS_ARRAY) && !is_class(arg_array, JSCLASS_ARGUMENTS) )) {
 447                 jsdisp_release(arg_array);
 448                 arg_array = NULL;
 449             }
 450         }
 451
 452         if(arg_array) {
 453             hres = array_to_args(ctx, arg_array, &cnt, &args);
 454             jsdisp_release(arg_array);
 455         }else {
 456             FIXME("throw TypeError\n");
 457             hres = E_FAIL;
 458         }
 459     }
 460
 461     if(SUCCEEDED(hres)) {
 462         if(function) {
 463             hres = call_function(ctx, function, this_obj, cnt, args, (flags & DISPATCH_JSCRIPT_CALLEREXECSSOURCE) != 0, r);
 464         }else {
 465             jsval_t res;
 466             hres = disp_call_value(ctx, jsthis->u.disp, this_obj, DISPATCH_METHOD, cnt, args, &res);
 467             if(SUCCEEDED(hres)) {
 468                 if(r)
 469                     *r = res;
 470                 else
 471                     jsval_release(res);
 472             }
 473         }
 474     }
 475
 476     if(this_obj)
 477         IDispatch_Release(this_obj);
 478     for(i=0; i < cnt; i++)
 479         jsval_release(args[i]);
 480     heap_free(args);
 481     return hres;
 482 }
 483
 484 static HRESULT Function_call(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
 485         jsval_t *r)
 486 {
 487     FunctionInstance *function;
 488     IDispatch *this_obj = NULL;
 489     unsigned cnt = 0;
 490     HRESULT hres;
 491
 492     TRACE("\n");
 493
 494     if(!(function = function_this(jsthis)))
 495         return throw_type_error(ctx, JS_E_FUNCTION_EXPECTED, NULL);
 496
 497     if(argc) {
 498         if(!is_undefined(argv[0]) && !is_null(argv[0])) {
 499             hres = to_object(ctx, argv[0], &this_obj);
 500             if(FAILED(hres))
 501                 return hres;
 502         }
 503
 504         cnt = argc-1;
 505     }
 506
 507     hres = call_function(ctx, function, this_obj, cnt, argv+1, (flags & DISPATCH_JSCRIPT_CALLEREXECSSOURCE) != 0, r);
 508
 509     if(this_obj)
 510         IDispatch_Release(this_obj);
 511     return hres;
 512 }
 513
 514 HRESULT Function_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
 515         jsval_t *r)
 516 {
 517     FunctionInstance *function;
 518
 519     TRACE("\n");
 520
 521     if(!is_vclass(jsthis, JSCLASS_FUNCTION)) {
 522         ERR("dispex is not a function\n");
 523         return E_FAIL;
 524     }
 525
 526     function = (FunctionInstance*)jsthis->u.jsdisp;
 527
 528     assert(function->value_proc != NULL);
 529     return invoke_value_proc(ctx, function, NULL, flags, argc, argv, r);
 530 }
 531
 532 HRESULT Function_get_value(script_ctx_t *ctx, jsdisp_t *jsthis, jsval_t *r)
 533 {
 534     jsstr_t *str;
 535     HRESULT hres;
 536
 537     TRACE("\n");
 538
 539     hres = function_to_string(function_from_jsdisp(jsthis), &str);
 540     if(FAILED(hres))
 541         return hres;
 542
 543     *r = jsval_string(str);
 544     return S_OK;
 545 }
 546
 547 static HRESULT Function_get_arguments(script_ctx_t *ctx, jsdisp_t *jsthis, jsval_t *r)
 548 {
 549     FunctionInstance *function = function_from_jsdisp(jsthis);
 550     call_frame_t *frame;
 551     HRESULT hres;
 552
 553     TRACE("\n");
 554
 555     for(frame = ctx->call_ctx; frame; frame = frame->prev_frame) {
 556         if(frame->function_instance == &function->dispex) {
 557             if(!frame->arguments_obj) {
 558                 hres = setup_arguments_object(ctx, frame);
 559                 if(FAILED(hres))
 560                     return hres;
 561             }
 562             *r = jsval_obj(jsdisp_addref(frame->arguments_obj));
 563             return S_OK;
 564         }
 565     }
 566
 567     *r = jsval_null();
 568     return S_OK;
 569 }
 570
 571 static void Function_destructor(jsdisp_t *dispex)
 572 {
 573     FunctionInstance *This = (FunctionInstance*)dispex;
 574
 575     if(This->code)
 576         release_bytecode(This->code);
 577     if(This->scope_chain)
 578         scope_release(This->scope_chain);
 579     heap_free(This);
 580 }
 581
 582 static const builtin_prop_t Function_props[] = {
 583     {applyW,                 Function_apply,                 PROPF_METHOD|2},
 584     {argumentsW,             NULL, 0,                        Function_get_arguments, builtin_set_const},
 585     {callW,                  Function_call,                  PROPF_METHOD|1},
 586     {lengthW,                NULL, 0,                        Function_get_length,    Function_set_length},
 587     {toStringW,              Function_toString,              PROPF_METHOD}
 588 };
 589
 590 static const builtin_info_t Function_info = {
 591     JSCLASS_FUNCTION,
 592     DEFAULT_FUNCTION_VALUE,
 593     sizeof(Function_props)/sizeof(*Function_props),
 594     Function_props,
 595     Function_destructor,
 596     NULL
 597 };
 598
 599 static const builtin_prop_t FunctionInst_props[] = {
 600     {argumentsW,             NULL, 0,                        Function_get_arguments, builtin_set_const},
 601     {lengthW,                NULL, 0,                        Function_get_length,    Function_set_length}
 602 };
 603
 604 static const builtin_info_t FunctionInst_info = {
 605     JSCLASS_FUNCTION,
 606     DEFAULT_FUNCTION_VALUE,
 607     sizeof(FunctionInst_props)/sizeof(*FunctionInst_props),
 608     FunctionInst_props,
 609     Function_destructor,
 610     NULL
 611 };
 612
 613 static HRESULT create_function(script_ctx_t *ctx, const builtin_info_t *builtin_info, DWORD flags,
 614         BOOL funcprot, jsdisp_t *prototype, FunctionInstance **ret)
 615 {
 616     FunctionInstance *function;
 617     HRESULT hres;
 618
 619     function = heap_alloc_zero(sizeof(FunctionInstance));
 620     if(!function)
 621         return E_OUTOFMEMORY;
 622
 623     if(funcprot)
 624         hres = init_dispex(&function->dispex, ctx, builtin_info, prototype);
 625     else if(builtin_info)
 626         hres = init_dispex_from_constr(&function->dispex, ctx, builtin_info, ctx->function_constr);
 627     else
 628         hres = init_dispex_from_constr(&function->dispex, ctx, &FunctionInst_info, ctx->function_constr);
 629     if(FAILED(hres)) {
 630         heap_free(function);
 631         return hres;
 632     }
 633
 634     function->flags = flags;
 635     function->length = flags & PROPF_ARGMASK;
 636
 637     *ret = function;
 638     return S_OK;
 639 }
 640
 641 static inline HRESULT set_prototype(script_ctx_t *ctx, jsdisp_t *dispex, jsdisp_t *prototype)
 642 {
 643     return jsdisp_propput_dontenum(dispex, prototypeW, jsval_obj(prototype));
 644 }
 645
 646 HRESULT create_builtin_function(script_ctx_t *ctx, builtin_invoke_t value_proc, const WCHAR *name,
 647         const builtin_info_t *builtin_info, DWORD flags, jsdisp_t *prototype, jsdisp_t **ret)
 648 {
 649     FunctionInstance *function;
 650     HRESULT hres;
 651
 652     hres = create_function(ctx, builtin_info, flags, FALSE, NULL, &function);
 653     if(FAILED(hres))
 654         return hres;
 655
 656     if(builtin_info)
 657         hres = jsdisp_propput_const(&function->dispex, lengthW, jsval_number(function->length));
 658     if(SUCCEEDED(hres))
 659         hres = set_prototype(ctx, &function->dispex, prototype);
 660     if(FAILED(hres)) {
 661         jsdisp_release(&function->dispex);
 662         return hres;
 663     }
 664
 665     function->value_proc = value_proc;
 666     function->name = name;
 667
 668     *ret = &function->dispex;
 669     return S_OK;
 670 }
 671
 672 static HRESULT set_constructor_prop(script_ctx_t *ctx, jsdisp_t *constr, jsdisp_t *prot)
 673 {
 674     static const WCHAR constructorW[] = {'c','o','n','s','t','r','u','c','t','o','r',0};
 675
 676     return jsdisp_propput_dontenum(prot, constructorW, jsval_obj(constr));
 677 }
 678
 679 HRESULT create_builtin_constructor(script_ctx_t *ctx, builtin_invoke_t value_proc, const WCHAR *name,
 680         const builtin_info_t *builtin_info, DWORD flags, jsdisp_t *prototype, jsdisp_t **ret)
 681 {
 682     jsdisp_t *constr;
 683     HRESULT hres;
 684
 685     hres = create_builtin_function(ctx, value_proc, name, builtin_info, flags, prototype, &constr);
 686     if(FAILED(hres))
 687         return hres;
 688
 689     hres = set_constructor_prop(ctx, constr, prototype);
 690     if(FAILED(hres)) {
 691         jsdisp_release(constr);
 692         return hres;
 693     }
 694
 695     *ret = constr;
 696     return S_OK;
 697 }
 698
 699 HRESULT create_source_function(script_ctx_t *ctx, bytecode_t *code, function_code_t *func_code,
 700         scope_chain_t *scope_chain, jsdisp_t **ret)
 701 {
 702     FunctionInstance *function;
 703     jsdisp_t *prototype;
 704     HRESULT hres;
 705
 706     hres = create_object(ctx, NULL, &prototype);
 707     if(FAILED(hres))
 708         return hres;
 709
 710     hres = create_function(ctx, NULL, PROPF_CONSTR, FALSE, NULL, &function);
 711     if(SUCCEEDED(hres)) {
 712         hres = set_prototype(ctx, &function->dispex, prototype);
 713         if(SUCCEEDED(hres))
 714             hres = set_constructor_prop(ctx, &function->dispex, prototype);
 715         if(FAILED(hres))
 716             jsdisp_release(&function->dispex);
 717     }
 718     jsdisp_release(prototype);
 719     if(FAILED(hres))
 720         return hres;
 721
 722     if(scope_chain) {
 723         scope_addref(scope_chain);
 724         function->scope_chain = scope_chain;
 725     }
 726
 727     bytecode_addref(code);
 728     function->code = code;
 729     function->func_code = func_code;
 730     function->length = function->func_code->param_cnt;
 731
 732     *ret = &function->dispex;
 733     return S_OK;
 734 }
 735
 736 static HRESULT construct_function(script_ctx_t *ctx, unsigned argc, jsval_t *argv, IDispatch **ret)
 737 {
 738     WCHAR *str = NULL, *ptr;
 739     unsigned len = 0, i = 0;
 740     bytecode_t *code;
 741     jsdisp_t *function;
 742     jsstr_t **params = NULL;
 743     int j = 0;
 744     HRESULT hres = S_OK;
 745
 746     static const WCHAR function_anonymousW[] = {'f','u','n','c','t','i','o','n',' ','a','n','o','n','y','m','o','u','s','('};
 747     static const WCHAR function_beginW[] = {')',' ','{','\n'};
 748     static const WCHAR function_endW[] = {'\n','}',0};
 749
 750     if(argc) {
 751         params = heap_alloc(argc*sizeof(*params));
 752         if(!params)
 753             return E_OUTOFMEMORY;
 754
 755         if(argc > 2)
 756             len = (argc-2)*2; /* separating commas */
 757         for(i=0; i < argc; i++) {
 758             hres = to_string(ctx, argv[i], params+i);
 759             if(FAILED(hres))
 760                 break;
 761             len += jsstr_length(params[i]);
 762         }
 763     }
 764
 765     if(SUCCEEDED(hres)) {
 766         len += (sizeof(function_anonymousW) + sizeof(function_beginW) + sizeof(function_endW)) / sizeof(WCHAR);
 767         str = heap_alloc(len*sizeof(WCHAR));
 768         if(str) {
 769             memcpy(str, function_anonymousW, sizeof(function_anonymousW));
 770             ptr = str + sizeof(function_anonymousW)/sizeof(WCHAR);
 771             if(argc > 1) {
 772                 while(1) {
 773                     ptr += jsstr_flush(params[j], ptr);
 774                     if(++j == argc-1)
 775                         break;
 776                     *ptr++ = ',';
 777                     *ptr++ = ' ';
 778                 }
 779             }
 780             memcpy(ptr, function_beginW, sizeof(function_beginW));
 781             ptr += sizeof(function_beginW)/sizeof(WCHAR);
 782             if(argc)
 783                 ptr += jsstr_flush(params[argc-1], ptr);
 784             memcpy(ptr, function_endW, sizeof(function_endW));
 785
 786             TRACE("%s\n", debugstr_w(str));
 787         }else {
 788             hres = E_OUTOFMEMORY;
 789         }
 790     }
 791
 792     while(i)
 793         jsstr_release(params[--i]);
 794     heap_free(params);
 795     if(FAILED(hres))
 796         return hres;
 797
 798     hres = compile_script(ctx, str, NULL, NULL, FALSE, FALSE, &code);
 799     heap_free(str);
 800     if(FAILED(hres))
 801         return hres;
 802
 803     if(code->global_code.func_cnt != 1 || code->global_code.var_cnt != 1) {
 804         ERR("Invalid parser result!\n");
 805         release_bytecode(code);
 806         return E_UNEXPECTED;
 807     }
 808
 809     hres = create_source_function(ctx, code, code->global_code.funcs, NULL, &function);
 810     release_bytecode(code);
 811     if(FAILED(hres))
 812         return hres;
 813
 814     *ret = to_disp(function);
 815     return S_OK;
 816 }
 817
 818 static HRESULT FunctionConstr_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
 819         jsval_t *r)
 820 {
 821     HRESULT hres;
 822
 823     TRACE("\n");
 824
 825     switch(flags) {
 826     case DISPATCH_METHOD:
 827     case DISPATCH_CONSTRUCT: {
 828         IDispatch *ret;
 829
 830         hres = construct_function(ctx, argc, argv, &ret);
 831         if(FAILED(hres))
 832             return hres;
 833
 834         *r = jsval_disp(ret);
 835         break;
 836     }
 837     default:
 838         FIXME("unimplemented flags %x\n", flags);
 839         return E_NOTIMPL;
 840     }
 841
 842     return S_OK;
 843 }
 844
 845 static HRESULT FunctionProt_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
 846         jsval_t *r)
 847 {
 848     FIXME("\n");
 849     return E_NOTIMPL;
 850 }
 851
 852 HRESULT init_function_constr(script_ctx_t *ctx, jsdisp_t *object_prototype)
 853 {
 854     FunctionInstance *prot, *constr;
 855     HRESULT hres;
 856
 857     static const WCHAR FunctionW[] = {'F','u','n','c','t','i','o','n',0};
 858
 859     hres = create_function(ctx, &Function_info, PROPF_CONSTR, TRUE, object_prototype, &prot);
 860     if(FAILED(hres))
 861         return hres;
 862
 863     prot->value_proc = FunctionProt_value;
 864     prot->name = prototypeW;
 865
 866     hres = create_function(ctx, &FunctionInst_info, PROPF_CONSTR|1, TRUE, &prot->dispex, &constr);
 867     if(SUCCEEDED(hres)) {
 868         constr->value_proc = FunctionConstr_value;
 869         constr->name = FunctionW;
 870         hres = set_prototype(ctx, &constr->dispex, &prot->dispex);
 871         if(SUCCEEDED(hres))
 872             hres = set_constructor_prop(ctx, &constr->dispex, &prot->dispex);
 873         if(FAILED(hres))
 874             jsdisp_release(&constr->dispex);
 875     }
 876     jsdisp_release(&prot->dispex);
 877     if(FAILED(hres))
 878         return hres;
 879
 880     ctx->function_constr = &constr->dispex;
 881     return S_OK;
 882 }