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     jsdisp_t *var_obj;
  43 } ArgumentsInstance;
  44
  45 static inline FunctionInstance *function_from_jsdisp(jsdisp_t *jsdisp)
  46 {
  47     return CONTAINING_RECORD(jsdisp, FunctionInstance, dispex);
  48 }
  49
  50 static inline FunctionInstance *function_from_vdisp(vdisp_t *vdisp)
  51 {
  52     return function_from_jsdisp(vdisp->u.jsdisp);
  53 }
  54
  55 static inline FunctionInstance *function_this(vdisp_t *jsthis)
  56 {
  57     return is_vclass(jsthis, JSCLASS_FUNCTION) ? function_from_vdisp(jsthis) : NULL;
  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 init_parameters(jsdisp_t *var_disp, FunctionInstance *function, unsigned argc, jsval_t *argv)
  69 {
  70     DWORD i=0;
  71     HRESULT hres;
  72
  73     for(i=0; i < function->func_code->param_cnt; i++) {
  74         hres = jsdisp_propput_name(var_disp, function->func_code->params[i],
  75                 i < argc ? argv[i] : jsval_undefined());
  76         if(FAILED(hres))
  77             return hres;
  78     }
  79
  80     return S_OK;
  81 }
  82
  83 static HRESULT Arguments_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
  84         jsval_t *r)
  85 {
  86     FIXME("\n");
  87     return E_NOTIMPL;
  88 }
  89
  90 static void Arguments_destructor(jsdisp_t *jsdisp)
  91 {
  92     ArgumentsInstance *arguments = (ArgumentsInstance*)jsdisp;
  93
  94     jsdisp_release(&arguments->function->dispex);
  95     jsdisp_release(arguments->var_obj);
  96     heap_free(arguments);
  97 }
  98
  99 static unsigned Arguments_idx_length(jsdisp_t *jsdisp)
 100 {
 101     ArgumentsInstance *arguments = (ArgumentsInstance*)jsdisp;
 102     return arguments->function->length;
 103 }
 104
 105 static HRESULT Arguments_idx_get(jsdisp_t *jsdisp, unsigned idx, jsval_t *res)
 106 {
 107     ArgumentsInstance *arguments = (ArgumentsInstance*)jsdisp;
 108
 109     TRACE("%p[%u]\n", arguments, idx);
 110
 111     /* FIXME: Accessing by name won't work for duplicated argument names */
 112     return jsdisp_propget_name(arguments->var_obj, arguments->function->func_code->params[idx], res);
 113 }
 114
 115 static HRESULT Arguments_idx_put(jsdisp_t *jsdisp, unsigned idx, jsval_t val)
 116 {
 117     ArgumentsInstance *arguments = (ArgumentsInstance*)jsdisp;
 118
 119     TRACE("%p[%u] = %s\n", arguments, idx, debugstr_jsval(val));
 120
 121     /* FIXME: Accessing by name won't work for duplicated argument names */
 122     return jsdisp_propput_name(arguments->var_obj, arguments->function->func_code->params[idx], val);
 123 }
 124
 125 static const builtin_info_t Arguments_info = {
 126     JSCLASS_ARGUMENTS,
 127     {NULL, Arguments_value, 0},
 128     0, NULL,
 129     Arguments_destructor,
 130     NULL,
 131     Arguments_idx_length,
 132     Arguments_idx_get,
 133     Arguments_idx_put
 134 };
 135
 136 static HRESULT create_arguments(script_ctx_t *ctx, FunctionInstance *calee, jsdisp_t *var_obj,
 137         unsigned argc, jsval_t *argv, jsdisp_t **ret)
 138 {
 139     ArgumentsInstance *args;
 140     unsigned i;
 141     HRESULT hres;
 142
 143     static const WCHAR caleeW[] = {'c','a','l','l','e','e',0};
 144
 145     args = heap_alloc_zero(sizeof(*args));
 146     if(!args)
 147         return E_OUTOFMEMORY;
 148
 149     hres = init_dispex_from_constr(&args->jsdisp, ctx, &Arguments_info, ctx->object_constr);
 150     if(FAILED(hres)) {
 151         heap_free(args);
 152         return hres;
 153     }
 154
 155     jsdisp_addref(&calee->dispex);
 156     args->function = calee;
 157     args->var_obj = jsdisp_addref(var_obj);
 158
 159     /* Store unnamed arguments directly in arguments object */
 160     for(i = calee->length; i < argc; i++) {
 161         WCHAR buf[12];
 162
 163         static const WCHAR formatW[] = {'%','d',0};
 164
 165         sprintfW(buf, formatW, i);
 166         hres = jsdisp_propput_dontenum(&args->jsdisp, buf, argv[i]);
 167         if(FAILED(hres))
 168             break;
 169     }
 170
 171     if(SUCCEEDED(hres)) {
 172         hres = jsdisp_propput_dontenum(&args->jsdisp, lengthW, jsval_number(argc));
 173         if(SUCCEEDED(hres))
 174             hres = jsdisp_propput_dontenum(&args->jsdisp, caleeW, jsval_disp(to_disp(&calee->dispex)));
 175     }
 176     if(FAILED(hres)) {
 177         jsdisp_release(&args->jsdisp);
 178         return hres;
 179     }
 180
 181     *ret = &args->jsdisp;
 182     return S_OK;
 183 }
 184
 185 static HRESULT create_var_disp(script_ctx_t *ctx, FunctionInstance *function, unsigned argc, jsval_t *argv, jsdisp_t **ret)
 186 {
 187     jsdisp_t *var_disp;
 188     HRESULT hres;
 189
 190     hres = create_dispex(ctx, NULL, NULL, &var_disp);
 191     if(FAILED(hres))
 192         return hres;
 193
 194     hres = init_parameters(var_disp, function, argc, argv);
 195     if(FAILED(hres)) {
 196         jsdisp_release(var_disp);
 197         return hres;
 198     }
 199
 200     *ret = var_disp;
 201     return S_OK;
 202 }
 203
 204 static HRESULT invoke_source(script_ctx_t *ctx, FunctionInstance *function, IDispatch *this_obj, unsigned argc, jsval_t *argv,
 205         BOOL is_constructor, BOOL caller_execs_source, jsval_t *r)
 206 {
 207     jsdisp_t *var_disp, *arg_disp;
 208     scope_chain_t *scope;
 209     HRESULT hres;
 210
 211     if(ctx->state == SCRIPTSTATE_UNINITIALIZED || ctx->state == SCRIPTSTATE_CLOSED) {
 212         WARN("Script engine state does not allow running code.\n");
 213         return E_UNEXPECTED;
 214     }
 215
 216     if(!function->func_code) {
 217         FIXME("no source\n");
 218         return E_FAIL;
 219     }
 220
 221     hres = create_var_disp(ctx, function, argc, argv, &var_disp);
 222     if(FAILED(hres))
 223         return hres;
 224
 225     hres = create_arguments(ctx, function, var_disp, argc, argv, &arg_disp);
 226     if(FAILED(hres)) {
 227         jsdisp_release(var_disp);
 228         return hres;
 229     }
 230
 231     hres = jsdisp_propput(var_disp, argumentsW, PROPF_DONTDELETE, jsval_obj(arg_disp));
 232     if(FAILED(hres)) {
 233         jsdisp_release(arg_disp);
 234         jsdisp_release(var_disp);
 235         return hres;
 236     }
 237
 238     hres = scope_push(function->scope_chain, var_disp, to_disp(var_disp), &scope);
 239     if(SUCCEEDED(hres)) {
 240         DWORD exec_flags = 0;
 241
 242         if(caller_execs_source)
 243             exec_flags |= EXEC_RETURN_TO_INTERP;
 244         if(is_constructor)
 245             exec_flags |= EXEC_CONSTRUCTOR;
 246         hres = exec_source(ctx, exec_flags, function->code, function->func_code, scope, this_obj,
 247                 &function->dispex, var_disp, arg_disp, r);
 248
 249         scope_release(scope);
 250     }
 251
 252     jsdisp_release(arg_disp);
 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)))
 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((IUnknown*)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         hres = call_function(ctx, function, this_obj, cnt, args, (flags & DISPATCH_JSCRIPT_CALLEREXECSSOURCE) != 0, r);
 463
 464     if(this_obj)
 465         IDispatch_Release(this_obj);
 466     for(i=0; i < cnt; i++)
 467         jsval_release(args[i]);
 468     heap_free(args);
 469     return hres;
 470 }
 471
 472 static HRESULT Function_call(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
 473         jsval_t *r)
 474 {
 475     FunctionInstance *function;
 476     IDispatch *this_obj = NULL;
 477     unsigned cnt = 0;
 478     HRESULT hres;
 479
 480     TRACE("\n");
 481
 482     if(!(function = function_this(jsthis)))
 483         return throw_type_error(ctx, JS_E_FUNCTION_EXPECTED, NULL);
 484
 485     if(argc) {
 486         if(!is_undefined(argv[0]) && !is_null(argv[0])) {
 487             hres = to_object(ctx, argv[0], &this_obj);
 488             if(FAILED(hres))
 489                 return hres;
 490         }
 491
 492         cnt = argc-1;
 493     }
 494
 495     hres = call_function(ctx, function, this_obj, cnt, argv+1, (flags & DISPATCH_JSCRIPT_CALLEREXECSSOURCE) != 0, r);
 496
 497     if(this_obj)
 498         IDispatch_Release(this_obj);
 499     return hres;
 500 }
 501
 502 HRESULT Function_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
 503         jsval_t *r)
 504 {
 505     FunctionInstance *function;
 506
 507     TRACE("\n");
 508
 509     if(!is_vclass(jsthis, JSCLASS_FUNCTION)) {
 510         ERR("dispex is not a function\n");
 511         return E_FAIL;
 512     }
 513
 514     function = (FunctionInstance*)jsthis->u.jsdisp;
 515
 516     assert(function->value_proc != NULL);
 517     return invoke_value_proc(ctx, function, NULL, flags, argc, argv, r);
 518 }
 519
 520 HRESULT Function_get_value(script_ctx_t *ctx, jsdisp_t *jsthis, jsval_t *r)
 521 {
 522     jsstr_t *str;
 523     HRESULT hres;
 524
 525     TRACE("\n");
 526
 527     hres = function_to_string(function_from_jsdisp(jsthis), &str);
 528     if(FAILED(hres))
 529         return hres;
 530
 531     *r = jsval_string(str);
 532     return S_OK;
 533 }
 534
 535 static HRESULT Function_get_arguments(script_ctx_t *ctx, jsdisp_t *jsthis, jsval_t *r)
 536 {
 537     FunctionInstance *function = function_from_jsdisp(jsthis);
 538     call_frame_t *frame;
 539
 540     TRACE("\n");
 541
 542     for(frame = ctx->call_ctx; frame; frame = frame->prev_frame) {
 543         if(frame->function_instance == &function->dispex) {
 544             *r = jsval_obj(jsdisp_addref(frame->arguments_obj));
 545             return S_OK;
 546         }
 547     }
 548
 549     *r = jsval_null();
 550     return S_OK;
 551 }
 552
 553 static void Function_destructor(jsdisp_t *dispex)
 554 {
 555     FunctionInstance *This = (FunctionInstance*)dispex;
 556
 557     if(This->code)
 558         release_bytecode(This->code);
 559     if(This->scope_chain)
 560         scope_release(This->scope_chain);
 561     heap_free(This);
 562 }
 563
 564 static const builtin_prop_t Function_props[] = {
 565     {applyW,                 Function_apply,                 PROPF_METHOD|2},
 566     {argumentsW,             NULL, 0,                        Function_get_arguments, builtin_set_const},
 567     {callW,                  Function_call,                  PROPF_METHOD|1},
 568     {lengthW,                NULL, 0,                        Function_get_length,    Function_set_length},
 569     {toStringW,              Function_toString,              PROPF_METHOD}
 570 };
 571
 572 static const builtin_info_t Function_info = {
 573     JSCLASS_FUNCTION,
 574     DEFAULT_FUNCTION_VALUE,
 575     sizeof(Function_props)/sizeof(*Function_props),
 576     Function_props,
 577     Function_destructor,
 578     NULL
 579 };
 580
 581 static const builtin_prop_t FunctionInst_props[] = {
 582     {argumentsW,             NULL, 0,                        Function_get_arguments, builtin_set_const},
 583     {lengthW,                NULL, 0,                        Function_get_length,    Function_set_length}
 584 };
 585
 586 static const builtin_info_t FunctionInst_info = {
 587     JSCLASS_FUNCTION,
 588     DEFAULT_FUNCTION_VALUE,
 589     sizeof(FunctionInst_props)/sizeof(*FunctionInst_props),
 590     FunctionInst_props,
 591     Function_destructor,
 592     NULL
 593 };
 594
 595 static HRESULT create_function(script_ctx_t *ctx, const builtin_info_t *builtin_info, DWORD flags,
 596         BOOL funcprot, jsdisp_t *prototype, FunctionInstance **ret)
 597 {
 598     FunctionInstance *function;
 599     HRESULT hres;
 600
 601     function = heap_alloc_zero(sizeof(FunctionInstance));
 602     if(!function)
 603         return E_OUTOFMEMORY;
 604
 605     if(funcprot)
 606         hres = init_dispex(&function->dispex, ctx, builtin_info, prototype);
 607     else if(builtin_info)
 608         hres = init_dispex_from_constr(&function->dispex, ctx, builtin_info, ctx->function_constr);
 609     else
 610         hres = init_dispex_from_constr(&function->dispex, ctx, &FunctionInst_info, ctx->function_constr);
 611     if(FAILED(hres)) {
 612         heap_free(function);
 613         return hres;
 614     }
 615
 616     function->flags = flags;
 617     function->length = flags & PROPF_ARGMASK;
 618
 619     *ret = function;
 620     return S_OK;
 621 }
 622
 623 static inline HRESULT set_prototype(script_ctx_t *ctx, jsdisp_t *dispex, jsdisp_t *prototype)
 624 {
 625     return jsdisp_propput_dontenum(dispex, prototypeW, jsval_obj(prototype));
 626 }
 627
 628 HRESULT create_builtin_function(script_ctx_t *ctx, builtin_invoke_t value_proc, const WCHAR *name,
 629         const builtin_info_t *builtin_info, DWORD flags, jsdisp_t *prototype, jsdisp_t **ret)
 630 {
 631     FunctionInstance *function;
 632     HRESULT hres;
 633
 634     hres = create_function(ctx, builtin_info, flags, FALSE, NULL, &function);
 635     if(FAILED(hres))
 636         return hres;
 637
 638     if(builtin_info)
 639         hres = jsdisp_propput_const(&function->dispex, lengthW, jsval_number(function->length));
 640     if(SUCCEEDED(hres))
 641         hres = set_prototype(ctx, &function->dispex, prototype);
 642     if(FAILED(hres)) {
 643         jsdisp_release(&function->dispex);
 644         return hres;
 645     }
 646
 647     function->value_proc = value_proc;
 648     function->name = name;
 649
 650     *ret = &function->dispex;
 651     return S_OK;
 652 }
 653
 654 static HRESULT set_constructor_prop(script_ctx_t *ctx, jsdisp_t *constr, jsdisp_t *prot)
 655 {
 656     static const WCHAR constructorW[] = {'c','o','n','s','t','r','u','c','t','o','r',0};
 657
 658     return jsdisp_propput_dontenum(prot, constructorW, jsval_obj(constr));
 659 }
 660
 661 HRESULT create_builtin_constructor(script_ctx_t *ctx, builtin_invoke_t value_proc, const WCHAR *name,
 662         const builtin_info_t *builtin_info, DWORD flags, jsdisp_t *prototype, jsdisp_t **ret)
 663 {
 664     jsdisp_t *constr;
 665     HRESULT hres;
 666
 667     hres = create_builtin_function(ctx, value_proc, name, builtin_info, flags, prototype, &constr);
 668     if(FAILED(hres))
 669         return hres;
 670
 671     hres = set_constructor_prop(ctx, constr, prototype);
 672     if(FAILED(hres)) {
 673         jsdisp_release(constr);
 674         return hres;
 675     }
 676
 677     *ret = constr;
 678     return S_OK;
 679 }
 680
 681 HRESULT create_source_function(script_ctx_t *ctx, bytecode_t *code, function_code_t *func_code,
 682         scope_chain_t *scope_chain, jsdisp_t **ret)
 683 {
 684     FunctionInstance *function;
 685     jsdisp_t *prototype;
 686     HRESULT hres;
 687
 688     hres = create_object(ctx, NULL, &prototype);
 689     if(FAILED(hres))
 690         return hres;
 691
 692     hres = create_function(ctx, NULL, PROPF_CONSTR, FALSE, NULL, &function);
 693     if(SUCCEEDED(hres)) {
 694         hres = set_prototype(ctx, &function->dispex, prototype);
 695         if(SUCCEEDED(hres))
 696             hres = set_constructor_prop(ctx, &function->dispex, prototype);
 697         if(FAILED(hres))
 698             jsdisp_release(&function->dispex);
 699     }
 700     jsdisp_release(prototype);
 701     if(FAILED(hres))
 702         return hres;
 703
 704     if(scope_chain) {
 705         scope_addref(scope_chain);
 706         function->scope_chain = scope_chain;
 707     }
 708
 709     bytecode_addref(code);
 710     function->code = code;
 711     function->func_code = func_code;
 712     function->length = function->func_code->param_cnt;
 713
 714     *ret = &function->dispex;
 715     return S_OK;
 716 }
 717
 718 static HRESULT construct_function(script_ctx_t *ctx, unsigned argc, jsval_t *argv, IDispatch **ret)
 719 {
 720     WCHAR *str = NULL, *ptr;
 721     unsigned len = 0, i = 0;
 722     bytecode_t *code;
 723     jsdisp_t *function;
 724     jsstr_t **params = NULL;
 725     int j = 0;
 726     HRESULT hres = S_OK;
 727
 728     static const WCHAR function_anonymousW[] = {'f','u','n','c','t','i','o','n',' ','a','n','o','n','y','m','o','u','s','('};
 729     static const WCHAR function_beginW[] = {')',' ','{','\n'};
 730     static const WCHAR function_endW[] = {'\n','}',0};
 731
 732     if(argc) {
 733         params = heap_alloc(argc*sizeof(*params));
 734         if(!params)
 735             return E_OUTOFMEMORY;
 736
 737         if(argc > 2)
 738             len = (argc-2)*2; /* separating commas */
 739         for(i=0; i < argc; i++) {
 740             hres = to_string(ctx, argv[i], params+i);
 741             if(FAILED(hres))
 742                 break;
 743             len += jsstr_length(params[i]);
 744         }
 745     }
 746
 747     if(SUCCEEDED(hres)) {
 748         len += (sizeof(function_anonymousW) + sizeof(function_beginW) + sizeof(function_endW)) / sizeof(WCHAR);
 749         str = heap_alloc(len*sizeof(WCHAR));
 750         if(str) {
 751             memcpy(str, function_anonymousW, sizeof(function_anonymousW));
 752             ptr = str + sizeof(function_anonymousW)/sizeof(WCHAR);
 753             if(argc > 1) {
 754                 while(1) {
 755                     ptr += jsstr_flush(params[j], ptr);
 756                     if(++j == argc-1)
 757                         break;
 758                     *ptr++ = ',';
 759                     *ptr++ = ' ';
 760                 }
 761             }
 762             memcpy(ptr, function_beginW, sizeof(function_beginW));
 763             ptr += sizeof(function_beginW)/sizeof(WCHAR);
 764             if(argc)
 765                 ptr += jsstr_flush(params[argc-1], ptr);
 766             memcpy(ptr, function_endW, sizeof(function_endW));
 767
 768             TRACE("%s\n", debugstr_w(str));
 769         }else {
 770             hres = E_OUTOFMEMORY;
 771         }
 772     }
 773
 774     while(i)
 775         jsstr_release(params[--i]);
 776     heap_free(params);
 777     if(FAILED(hres))
 778         return hres;
 779
 780     hres = compile_script(ctx, str, NULL, NULL, FALSE, FALSE, &code);
 781     heap_free(str);
 782     if(FAILED(hres))
 783         return hres;
 784
 785     if(code->global_code.func_cnt != 1 || code->global_code.var_cnt) {
 786         ERR("Invalid parser result!\n");
 787         release_bytecode(code);
 788         return E_UNEXPECTED;
 789     }
 790
 791     hres = create_source_function(ctx, code, code->global_code.funcs, NULL, &function);
 792     release_bytecode(code);
 793     if(FAILED(hres))
 794         return hres;
 795
 796     *ret = to_disp(function);
 797     return S_OK;
 798 }
 799
 800 static HRESULT FunctionConstr_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
 801         jsval_t *r)
 802 {
 803     HRESULT hres;
 804
 805     TRACE("\n");
 806
 807     switch(flags) {
 808     case DISPATCH_METHOD:
 809     case DISPATCH_CONSTRUCT: {
 810         IDispatch *ret;
 811
 812         hres = construct_function(ctx, argc, argv, &ret);
 813         if(FAILED(hres))
 814             return hres;
 815
 816         *r = jsval_disp(ret);
 817         break;
 818     }
 819     default:
 820         FIXME("unimplemented flags %x\n", flags);
 821         return E_NOTIMPL;
 822     }
 823
 824     return S_OK;
 825 }
 826
 827 static HRESULT FunctionProt_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
 828         jsval_t *r)
 829 {
 830     FIXME("\n");
 831     return E_NOTIMPL;
 832 }
 833
 834 HRESULT init_function_constr(script_ctx_t *ctx, jsdisp_t *object_prototype)
 835 {
 836     FunctionInstance *prot, *constr;
 837     HRESULT hres;
 838
 839     static const WCHAR FunctionW[] = {'F','u','n','c','t','i','o','n',0};
 840
 841     hres = create_function(ctx, &Function_info, PROPF_CONSTR, TRUE, object_prototype, &prot);
 842     if(FAILED(hres))
 843         return hres;
 844
 845     prot->value_proc = FunctionProt_value;
 846     prot->name = prototypeW;
 847
 848     hres = create_function(ctx, &FunctionInst_info, PROPF_CONSTR|1, TRUE, &prot->dispex, &constr);
 849     if(SUCCEEDED(hres)) {
 850         constr->value_proc = FunctionConstr_value;
 851         constr->name = FunctionW;
 852         hres = set_prototype(ctx, &constr->dispex, &prot->dispex);
 853         if(SUCCEEDED(hres))
 854             hres = set_constructor_prop(ctx, &constr->dispex, &prot->dispex);
 855         if(FAILED(hres))
 856             jsdisp_release(&constr->dispex);
 857     }
 858     jsdisp_release(&prot->dispex);
 859     if(FAILED(hres))
 860         return hres;
 861
 862     ctx->function_constr = &constr->dispex;
 863     return S_OK;
 864 }