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 } FunctionInstance;
  38
  39 typedef struct {
  40     jsdisp_t jsdisp;
  41     FunctionInstance *function;
  42     jsval_t *buf;
  43     call_frame_t *frame;
  44     unsigned argc;
  45 } ArgumentsInstance;
  46
  47 static inline FunctionInstance *function_from_jsdisp(jsdisp_t *jsdisp)
  48 {
  49     return CONTAINING_RECORD(jsdisp, FunctionInstance, dispex);
  50 }
  51
  52 static inline FunctionInstance *function_from_vdisp(vdisp_t *vdisp)
  53 {
  54     return function_from_jsdisp(vdisp->u.jsdisp);
  55 }
  56
  57 static inline FunctionInstance *function_this(vdisp_t *jsthis)
  58 {
  59     return is_vclass(jsthis, JSCLASS_FUNCTION) ? function_from_vdisp(jsthis) : NULL;
  60 }
  61
  62 static inline ArgumentsInstance *arguments_from_jsdisp(jsdisp_t *jsdisp)
  63 {
  64     return CONTAINING_RECORD(jsdisp, ArgumentsInstance, jsdisp);
  65 }
  66
  67 static const WCHAR prototypeW[] = {'p','r','o','t','o','t', 'y', 'p','e',0};
  68
  69 static const WCHAR lengthW[] = {'l','e','n','g','t','h',0};
  70 static const WCHAR toStringW[] = {'t','o','S','t','r','i','n','g',0};
  71 static const WCHAR applyW[] = {'a','p','p','l','y',0};
  72 static const WCHAR callW[] = {'c','a','l','l',0};
  73 static const WCHAR argumentsW[] = {'a','r','g','u','m','e','n','t','s',0};
  74
  75 static HRESULT Arguments_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
  76         jsval_t *r)
  77 {
  78     FIXME("\n");
  79     return E_NOTIMPL;
  80 }
  81
  82 static void Arguments_destructor(jsdisp_t *jsdisp)
  83 {
  84     ArgumentsInstance *arguments = arguments_from_jsdisp(jsdisp);
  85
  86     TRACE("(%p)\n", arguments);
  87
  88     if(arguments->buf) {
  89         unsigned i;
  90         for(i = 0; i < arguments->argc; i++)
  91             jsval_release(arguments->buf[i]);
  92         heap_free(arguments->buf);
  93     }
  94
  95     jsdisp_release(&arguments->function->dispex);
  96     heap_free(arguments);
  97 }
  98
  99 static unsigned Arguments_idx_length(jsdisp_t *jsdisp)
 100 {
 101     ArgumentsInstance *arguments = arguments_from_jsdisp(jsdisp);
 102     return arguments->argc;
 103 }
 104
 105 static jsval_t *get_argument_ref(ArgumentsInstance *arguments, unsigned idx)
 106 {
 107     if(arguments->buf)
 108         return arguments->buf + idx;
 109     if(arguments->frame->base_scope->frame || idx >= arguments->frame->function->param_cnt)
 110         return arguments->jsdisp.ctx->stack + arguments->frame->arguments_off + idx;
 111     return NULL;
 112 }
 113
 114 static HRESULT Arguments_idx_get(jsdisp_t *jsdisp, unsigned idx, jsval_t *r)
 115 {
 116     ArgumentsInstance *arguments = arguments_from_jsdisp(jsdisp);
 117     jsval_t *ref;
 118
 119     TRACE("%p[%u]\n", arguments, idx);
 120
 121     if((ref = get_argument_ref(arguments, idx)))
 122         return jsval_copy(*ref, r);
 123
 124     /* FIXME: Accessing by name won't work for duplicated argument names */
 125     return jsdisp_propget_name(arguments->frame->base_scope->jsobj, arguments->function->func_code->params[idx], r);
 126 }
 127
 128 static HRESULT Arguments_idx_put(jsdisp_t *jsdisp, unsigned idx, jsval_t val)
 129 {
 130     ArgumentsInstance *arguments = arguments_from_jsdisp(jsdisp);
 131     jsval_t *ref;
 132     HRESULT hres;
 133
 134     TRACE("%p[%u] = %s\n", arguments, idx, debugstr_jsval(val));
 135
 136     if((ref = get_argument_ref(arguments, idx))) {
 137         jsval_t copy;
 138         hres = jsval_copy(val, &copy);
 139         if(FAILED(hres))
 140             return hres;
 141
 142         jsval_release(*ref);
 143         *ref = copy;
 144         return S_OK;
 145     }
 146
 147     /* FIXME: Accessing by name won't work for duplicated argument names */
 148     return jsdisp_propput_name(arguments->frame->base_scope->jsobj, arguments->function->func_code->params[idx], val);
 149 }
 150
 151 static const builtin_info_t Arguments_info = {
 152     JSCLASS_ARGUMENTS,
 153     {NULL, Arguments_value, 0},
 154     0, NULL,
 155     Arguments_destructor,
 156     NULL,
 157     Arguments_idx_length,
 158     Arguments_idx_get,
 159     Arguments_idx_put
 160 };
 161
 162 HRESULT setup_arguments_object(script_ctx_t *ctx, call_frame_t *frame)
 163 {
 164     ArgumentsInstance *args;
 165     HRESULT hres;
 166
 167     static const WCHAR caleeW[] = {'c','a','l','l','e','e',0};
 168
 169     args = heap_alloc_zero(sizeof(*args));
 170     if(!args)
 171         return E_OUTOFMEMORY;
 172
 173     hres = init_dispex_from_constr(&args->jsdisp, ctx, &Arguments_info, ctx->object_constr);
 174     if(FAILED(hres)) {
 175         heap_free(args);
 176         return hres;
 177     }
 178
 179     args->function = function_from_jsdisp(jsdisp_addref(frame->function_instance));
 180     args->argc = frame->argc;
 181     args->frame = frame;
 182
 183     hres = jsdisp_define_data_property(&args->jsdisp, lengthW, PROPF_WRITABLE | PROPF_CONFIGURABLE,
 184                                        jsval_number(args->argc));
 185     if(SUCCEEDED(hres))
 186         hres = jsdisp_define_data_property(&args->jsdisp, caleeW, PROPF_WRITABLE | PROPF_CONFIGURABLE,
 187                                            jsval_obj(&args->function->dispex));
 188     if(SUCCEEDED(hres))
 189         hres = jsdisp_propput(frame->base_scope->jsobj, argumentsW, PROPF_WRITABLE, jsval_obj(&args->jsdisp));
 190     if(FAILED(hres)) {
 191         jsdisp_release(&args->jsdisp);
 192         return hres;
 193     }
 194
 195     frame->arguments_obj = &args->jsdisp;
 196     return S_OK;
 197 }
 198
 199 void detach_arguments_object(jsdisp_t *args_disp)
 200 {
 201     ArgumentsInstance *arguments = arguments_from_jsdisp(args_disp);
 202     call_frame_t *frame = arguments->frame;
 203     const BOOL on_stack = frame->base_scope->frame == frame;
 204     HRESULT hres;
 205
 206     /* Reset arguments value to cut the reference cycle. Note that since all activation contexts have
 207      * their own arguments property, it's impossible to use prototype's one during name lookup */
 208     jsdisp_propput_name(frame->base_scope->jsobj, argumentsW, jsval_undefined());
 209     arguments->frame = NULL;
 210
 211     /* Don't bother coppying arguments if call frame holds the last reference. */
 212     if(arguments->jsdisp.ref > 1) {
 213         arguments->buf = heap_alloc(arguments->argc * sizeof(*arguments->buf));
 214         if(arguments->buf) {
 215             int i;
 216
 217             for(i = 0; i < arguments->argc ; i++) {
 218                 if(on_stack || i >= frame->function->param_cnt)
 219                     hres = jsval_copy(arguments->jsdisp.ctx->stack[frame->arguments_off + i], arguments->buf+i);
 220                 else
 221                     hres = jsdisp_propget_name(frame->base_scope->jsobj, frame->function->params[i], arguments->buf+i);
 222                 if(FAILED(hres))
 223                     arguments->buf[i] = jsval_undefined();
 224             }
 225         }else {
 226             ERR("out of memory\n");
 227             arguments->argc = 0;
 228         }
 229     }
 230
 231     jsdisp_release(frame->arguments_obj);
 232 }
 233
 234 static HRESULT invoke_source(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_obj, unsigned argc, jsval_t *argv,
 235         BOOL is_constructor, BOOL caller_execs_source, jsval_t *r)
 236 {
 237     jsdisp_t *var_disp;
 238     DWORD exec_flags = 0;
 239     HRESULT hres;
 240
 241     if(ctx->state == SCRIPTSTATE_UNINITIALIZED || ctx->state == SCRIPTSTATE_CLOSED) {
 242         WARN("Script engine state does not allow running code.\n");
 243         return E_UNEXPECTED;
 244     }
 245
 246     if(!function->func_code) {
 247         FIXME("no source\n");
 248         return E_FAIL;
 249     }
 250
 251     hres = create_dispex(ctx, NULL, NULL, &var_disp);
 252     if(FAILED(hres))
 253         return hres;
 254
 255     if(caller_execs_source)
 256         exec_flags |= EXEC_RETURN_TO_INTERP;
 257     if(is_constructor)
 258         exec_flags |= EXEC_CONSTRUCTOR;
 259     hres = exec_source(ctx, exec_flags, function->code, function->func_code, function->scope_chain, this_obj,
 260             &function->dispex, var_disp, argc, argv, r);
 261
 262     jsdisp_release(var_disp);
 263     return hres;
 264 }
 265
 266 static HRESULT invoke_value_proc(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_disp, WORD flags,
 267         unsigned argc, jsval_t *argv, jsval_t *r)
 268 {
 269     vdisp_t vthis;
 270     HRESULT hres;
 271
 272     if(this_disp)
 273         set_disp(&vthis, this_disp);
 274     else if(ctx->host_global)
 275         set_disp(&vthis, ctx->host_global);
 276     else
 277         set_jsdisp(&vthis, ctx->global);
 278
 279     hres = function->value_proc(ctx, &vthis, flags, argc, argv, r);
 280
 281     vdisp_release(&vthis);
 282     return hres;
 283 }
 284
 285 static HRESULT call_function(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_obj,
 286         unsigned argc, jsval_t *argv, BOOL caller_execs_source, jsval_t *r)
 287 {
 288     if(function->value_proc)
 289         return invoke_value_proc(ctx, function, this_obj, DISPATCH_METHOD, argc, argv, r);
 290
 291     return invoke_source(ctx, function, this_obj, argc, argv, FALSE, caller_execs_source, r);
 292 }
 293
 294 static HRESULT function_to_string(FunctionInstance *function, jsstr_t **ret)
 295 {
 296     jsstr_t *str;
 297
 298     static const WCHAR native_prefixW[] = {'\n','f','u','n','c','t','i','o','n',' '};
 299     static const WCHAR native_suffixW[] =
 300         {'(',')',' ','{','\n',' ',' ',' ',' ','[','n','a','t','i','v','e',' ','c','o','d','e',']','\n','}','\n'};
 301
 302     if(function->value_proc) {
 303         DWORD name_len;
 304         WCHAR *ptr;
 305
 306         name_len = strlenW(function->name);
 307         str = jsstr_alloc_buf((sizeof(native_prefixW)+sizeof(native_suffixW))/sizeof(WCHAR) + name_len, &ptr);
 308         if(!str)
 309             return E_OUTOFMEMORY;
 310
 311         memcpy(ptr, native_prefixW, sizeof(native_prefixW));
 312         memcpy(ptr += sizeof(native_prefixW)/sizeof(WCHAR), function->name, name_len*sizeof(WCHAR));
 313         memcpy(ptr + name_len, native_suffixW, sizeof(native_suffixW));
 314     }else {
 315         str = jsstr_alloc_len(function->func_code->source, function->func_code->source_len);
 316         if(!str)
 317             return E_OUTOFMEMORY;
 318     }
 319
 320     *ret = str;
 321     return S_OK;
 322 }
 323
 324 HRESULT Function_invoke(jsdisp_t *func_this, IDispatch *jsthis, WORD flags, unsigned argc, jsval_t *argv, jsval_t *r)
 325 {
 326     const BOOL caller_execs_source = (flags & DISPATCH_JSCRIPT_CALLEREXECSSOURCE) != 0;
 327     FunctionInstance *function;
 328
 329     TRACE("func %p this %p\n", func_this, jsthis);
 330
 331     assert(is_class(func_this, JSCLASS_FUNCTION));
 332     function = function_from_jsdisp(func_this);
 333
 334     flags &= ~DISPATCH_JSCRIPT_INTERNAL_MASK;
 335     if(function->value_proc)
 336         return invoke_value_proc(function->dispex.ctx, function, jsthis, flags, argc, argv, r);
 337
 338     if(flags == DISPATCH_CONSTRUCT) {
 339         jsdisp_t *this_obj;
 340         HRESULT hres;
 341
 342         hres = create_object(function->dispex.ctx, &function->dispex, &this_obj);
 343         if(FAILED(hres))
 344             return hres;
 345
 346         hres = invoke_source(function->dispex.ctx, function, to_disp(this_obj), argc, argv, TRUE, caller_execs_source, r);
 347         jsdisp_release(this_obj);
 348         return hres;
 349     }
 350
 351     assert(flags == DISPATCH_METHOD);
 352     return invoke_source(function->dispex.ctx, function, jsthis, argc, argv, FALSE, caller_execs_source, r);
 353 }
 354
 355 static HRESULT Function_get_length(script_ctx_t *ctx, jsdisp_t *jsthis, jsval_t *r)
 356 {
 357     TRACE("%p\n", jsthis);
 358
 359     *r = jsval_number(function_from_jsdisp(jsthis)->length);
 360     return S_OK;
 361 }
 362
 363 static HRESULT Function_toString(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
 364         jsval_t *r)
 365 {
 366     FunctionInstance *function;
 367     jsstr_t *str;
 368     HRESULT hres;
 369
 370     TRACE("\n");
 371
 372     if(!(function = function_this(jsthis)))
 373         return throw_type_error(ctx, JS_E_FUNCTION_EXPECTED, NULL);
 374
 375     hres = function_to_string(function, &str);
 376     if(FAILED(hres))
 377         return hres;
 378
 379     if(r)
 380         *r = jsval_string(str);
 381     else
 382         jsstr_release(str);
 383     return S_OK;
 384 }
 385
 386 static HRESULT array_to_args(script_ctx_t *ctx, jsdisp_t *arg_array, unsigned *argc, jsval_t **ret)
 387 {
 388     jsval_t *argv, val;
 389     DWORD length, i;
 390     HRESULT hres;
 391
 392     hres = jsdisp_propget_name(arg_array, lengthW, &val);
 393     if(FAILED(hres))
 394         return hres;
 395
 396     hres = to_uint32(ctx, val, &length);
 397     jsval_release(val);
 398     if(FAILED(hres))
 399         return hres;
 400
 401     argv = heap_alloc(length * sizeof(*argv));
 402     if(!argv)
 403         return E_OUTOFMEMORY;
 404
 405     for(i=0; i<length; i++) {
 406         hres = jsdisp_get_idx(arg_array, i, argv+i);
 407         if(hres == DISP_E_UNKNOWNNAME) {
 408             argv[i] = jsval_undefined();
 409         }else if(FAILED(hres)) {
 410             while(i--)
 411                 jsval_release(argv[i]);
 412             heap_free(argv);
 413             return hres;
 414         }
 415     }
 416
 417     *argc = length;
 418     *ret = argv;
 419     return S_OK;
 420 }
 421
 422 static HRESULT Function_apply(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv, jsval_t *r)
 423 {
 424     FunctionInstance *function;
 425     jsval_t *args = NULL;
 426     unsigned i, cnt = 0;
 427     IDispatch *this_obj = NULL;
 428     HRESULT hres = S_OK;
 429
 430     TRACE("\n");
 431
 432     if(!(function = function_this(jsthis)) && (jsthis->flags & VDISP_JSDISP))
 433         return throw_type_error(ctx, JS_E_FUNCTION_EXPECTED, NULL);
 434
 435     if(argc) {
 436         if(!is_undefined(argv[0]) && !is_null(argv[0])) {
 437             hres = to_object(ctx, argv[0], &this_obj);
 438             if(FAILED(hres))
 439                 return hres;
 440         }
 441     }
 442
 443     if(argc >= 2) {
 444         jsdisp_t *arg_array = NULL;
 445
 446         if(is_object_instance(argv[1])) {
 447             arg_array = iface_to_jsdisp(get_object(argv[1]));
 448             if(arg_array &&
 449                (!is_class(arg_array, JSCLASS_ARRAY) && !is_class(arg_array, JSCLASS_ARGUMENTS) )) {
 450                 jsdisp_release(arg_array);
 451                 arg_array = NULL;
 452             }
 453         }
 454
 455         if(arg_array) {
 456             hres = array_to_args(ctx, arg_array, &cnt, &args);
 457             jsdisp_release(arg_array);
 458         }else {
 459             FIXME("throw TypeError\n");
 460             hres = E_FAIL;
 461         }
 462     }
 463
 464     if(SUCCEEDED(hres)) {
 465         if(function) {
 466             hres = call_function(ctx, function, this_obj, cnt, args, (flags & DISPATCH_JSCRIPT_CALLEREXECSSOURCE) != 0, r);
 467         }else {
 468             jsval_t res;
 469             hres = disp_call_value(ctx, jsthis->u.disp, this_obj, DISPATCH_METHOD, cnt, args, &res);
 470             if(SUCCEEDED(hres)) {
 471                 if(r)
 472                     *r = res;
 473                 else
 474                     jsval_release(res);
 475             }
 476         }
 477     }
 478
 479     if(this_obj)
 480         IDispatch_Release(this_obj);
 481     for(i=0; i < cnt; i++)
 482         jsval_release(args[i]);
 483     heap_free(args);
 484     return hres;
 485 }
 486
 487 static HRESULT Function_call(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
 488         jsval_t *r)
 489 {
 490     FunctionInstance *function;
 491     IDispatch *this_obj = NULL;
 492     unsigned cnt = 0;
 493     HRESULT hres;
 494
 495     TRACE("\n");
 496
 497     if(!(function = function_this(jsthis)))
 498         return throw_type_error(ctx, JS_E_FUNCTION_EXPECTED, NULL);
 499
 500     if(argc) {
 501         if(!is_undefined(argv[0]) && !is_null(argv[0])) {
 502             hres = to_object(ctx, argv[0], &this_obj);
 503             if(FAILED(hres))
 504                 return hres;
 505         }
 506
 507         cnt = argc-1;
 508     }
 509
 510     hres = call_function(ctx, function, this_obj, cnt, argv+1, (flags & DISPATCH_JSCRIPT_CALLEREXECSSOURCE) != 0, r);
 511
 512     if(this_obj)
 513         IDispatch_Release(this_obj);
 514     return hres;
 515 }
 516
 517 HRESULT Function_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
 518         jsval_t *r)
 519 {
 520     FunctionInstance *function;
 521
 522     TRACE("\n");
 523
 524     if(!is_vclass(jsthis, JSCLASS_FUNCTION)) {
 525         ERR("dispex is not a function\n");
 526         return E_FAIL;
 527     }
 528
 529     function = function_from_jsdisp(jsthis->u.jsdisp);
 530
 531     assert(function->value_proc != NULL);
 532     return invoke_value_proc(ctx, function, NULL, flags, argc, argv, r);
 533 }
 534
 535 HRESULT Function_get_value(script_ctx_t *ctx, jsdisp_t *jsthis, jsval_t *r)
 536 {
 537     jsstr_t *str;
 538     HRESULT hres;
 539
 540     TRACE("\n");
 541
 542     hres = function_to_string(function_from_jsdisp(jsthis), &str);
 543     if(FAILED(hres))
 544         return hres;
 545
 546     *r = jsval_string(str);
 547     return S_OK;
 548 }
 549
 550 static HRESULT Function_get_arguments(script_ctx_t *ctx, jsdisp_t *jsthis, jsval_t *r)
 551 {
 552     FunctionInstance *function = function_from_jsdisp(jsthis);
 553     call_frame_t *frame;
 554     HRESULT hres;
 555
 556     TRACE("\n");
 557
 558     for(frame = ctx->call_ctx; frame; frame = frame->prev_frame) {
 559         if(frame->function_instance == &function->dispex) {
 560             if(!frame->arguments_obj) {
 561                 hres = setup_arguments_object(ctx, frame);
 562                 if(FAILED(hres))
 563                     return hres;
 564             }
 565             *r = jsval_obj(jsdisp_addref(frame->arguments_obj));
 566             return S_OK;
 567         }
 568     }
 569
 570     *r = jsval_null();
 571     return S_OK;
 572 }
 573
 574 static void Function_destructor(jsdisp_t *dispex)
 575 {
 576     FunctionInstance *This = function_from_jsdisp(dispex);
 577
 578     if(This->code)
 579         release_bytecode(This->code);
 580     if(This->scope_chain)
 581         scope_release(This->scope_chain);
 582     heap_free(This);
 583 }
 584
 585 static const builtin_prop_t Function_props[] = {
 586     {applyW,                 Function_apply,                 PROPF_METHOD|2},
 587     {argumentsW,             NULL, 0,                        Function_get_arguments},
 588     {callW,                  Function_call,                  PROPF_METHOD|1},
 589     {lengthW,                NULL, 0,                        Function_get_length},
 590     {toStringW,              Function_toString,              PROPF_METHOD}
 591 };
 592
 593 static const builtin_info_t Function_info = {
 594     JSCLASS_FUNCTION,
 595     DEFAULT_FUNCTION_VALUE,
 596     sizeof(Function_props)/sizeof(*Function_props),
 597     Function_props,
 598     Function_destructor,
 599     NULL
 600 };
 601
 602 static const builtin_prop_t FunctionInst_props[] = {
 603     {argumentsW,             NULL, 0,                        Function_get_arguments},
 604     {lengthW,                NULL, 0,                        Function_get_length}
 605 };
 606
 607 static const builtin_info_t FunctionInst_info = {
 608     JSCLASS_FUNCTION,
 609     DEFAULT_FUNCTION_VALUE,
 610     sizeof(FunctionInst_props)/sizeof(*FunctionInst_props),
 611     FunctionInst_props,
 612     Function_destructor,
 613     NULL
 614 };
 615
 616 static HRESULT create_function(script_ctx_t *ctx, const builtin_info_t *builtin_info, DWORD flags,
 617         BOOL funcprot, jsdisp_t *prototype, FunctionInstance **ret)
 618 {
 619     FunctionInstance *function;
 620     HRESULT hres;
 621
 622     function = heap_alloc_zero(sizeof(FunctionInstance));
 623     if(!function)
 624         return E_OUTOFMEMORY;
 625
 626     if(funcprot)
 627         hres = init_dispex(&function->dispex, ctx, builtin_info, prototype);
 628     else if(builtin_info)
 629         hres = init_dispex_from_constr(&function->dispex, ctx, builtin_info, ctx->function_constr);
 630     else
 631         hres = init_dispex_from_constr(&function->dispex, ctx, &FunctionInst_info, ctx->function_constr);
 632     if(FAILED(hres)) {
 633         heap_free(function);
 634         return hres;
 635     }
 636
 637     function->flags = flags;
 638     function->length = flags & PROPF_ARGMASK;
 639
 640     *ret = function;
 641     return S_OK;
 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_define_data_property(&function->dispex, lengthW, 0,
 656                                            jsval_number(function->length));
 657     if(SUCCEEDED(hres))
 658         hres = jsdisp_define_data_property(&function->dispex, prototypeW, 0, jsval_obj(prototype));
 659     if(FAILED(hres)) {
 660         jsdisp_release(&function->dispex);
 661         return hres;
 662     }
 663
 664     function->value_proc = value_proc;
 665     function->name = name;
 666
 667     *ret = &function->dispex;
 668     return S_OK;
 669 }
 670
 671 static HRESULT set_constructor_prop(script_ctx_t *ctx, jsdisp_t *constr, jsdisp_t *prot)
 672 {
 673     static const WCHAR constructorW[] = {'c','o','n','s','t','r','u','c','t','o','r',0};
 674
 675     return jsdisp_propput_dontenum(prot, constructorW, jsval_obj(constr));
 676 }
 677
 678 HRESULT create_builtin_constructor(script_ctx_t *ctx, builtin_invoke_t value_proc, const WCHAR *name,
 679         const builtin_info_t *builtin_info, DWORD flags, jsdisp_t *prototype, jsdisp_t **ret)
 680 {
 681     jsdisp_t *constr;
 682     HRESULT hres;
 683
 684     hres = create_builtin_function(ctx, value_proc, name, builtin_info, flags, prototype, &constr);
 685     if(FAILED(hres))
 686         return hres;
 687
 688     hres = set_constructor_prop(ctx, constr, prototype);
 689     if(FAILED(hres)) {
 690         jsdisp_release(constr);
 691         return hres;
 692     }
 693
 694     *ret = constr;
 695     return S_OK;
 696 }
 697
 698 HRESULT create_source_function(script_ctx_t *ctx, bytecode_t *code, function_code_t *func_code,
 699         scope_chain_t *scope_chain, jsdisp_t **ret)
 700 {
 701     FunctionInstance *function;
 702     jsdisp_t *prototype;
 703     HRESULT hres;
 704
 705     hres = create_object(ctx, NULL, &prototype);
 706     if(FAILED(hres))
 707         return hres;
 708
 709     hres = create_function(ctx, NULL, PROPF_CONSTR, FALSE, NULL, &function);
 710     if(SUCCEEDED(hres)) {
 711         hres = jsdisp_define_data_property(&function->dispex, prototypeW, PROPF_WRITABLE,
 712                                            jsval_obj(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 = jsdisp_define_data_property(&constr->dispex, prototypeW, 0, jsval_obj(&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 }