reactos/dll/win32/jscript/jsutils.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 WINE_DECLARE_DEBUG_CHANNEL(heap);
  22
  23 const char *debugstr_jsval(const jsval_t v)
  24 {
  25     switch(jsval_type(v)) {
  26     case JSV_UNDEFINED:
  27         return "undefined";
  28     case JSV_NULL:
  29         return "null";
  30     case JSV_OBJECT:
  31         return wine_dbg_sprintf("obj(%p)", get_object(v));
  32     case JSV_STRING:
  33         return wine_dbg_sprintf("str(%s)", debugstr_jsstr(get_string(v)));
  34     case JSV_NUMBER:
  35         return wine_dbg_sprintf("%lf", get_number(v));
  36     case JSV_BOOL:
  37         return get_bool(v) ? "true" : "false";
  38     case JSV_VARIANT:
  39         return debugstr_variant(get_variant(v));
  40     }
  41
  42     assert(0);
  43     return NULL;
  44 }
  45
  46 BOOL is_finite(double n)
  47 {
  48     return !isnan(n) && !isinf(n);
  49 }
  50
  51 #define MIN_BLOCK_SIZE  128
  52 #define ARENA_FREE_FILLER  0xaa
  53
  54 static inline DWORD block_size(DWORD block)
  55 {
  56     return MIN_BLOCK_SIZE << block;
  57 }
  58
  59 void heap_pool_init(heap_pool_t *heap)
  60 {
  61     memset(heap, 0, sizeof(*heap));
  62     list_init(&heap->custom_blocks);
  63 }
  64
  65 void *heap_pool_alloc(heap_pool_t *heap, DWORD size)
  66 {
  67     struct list *list;
  68     void *tmp;
  69
  70     if(!heap->block_cnt) {
  71         if(!heap->blocks) {
  72             heap->blocks = heap_alloc(sizeof(void*));
  73             if(!heap->blocks)
  74                 return NULL;
  75         }
  76
  77         tmp = heap_alloc(block_size(0));
  78         if(!tmp)
  79             return NULL;
  80
  81         heap->blocks[0] = tmp;
  82         heap->block_cnt = 1;
  83     }
  84
  85     if(heap->offset + size <= block_size(heap->last_block)) {
  86         tmp = ((BYTE*)heap->blocks[heap->last_block])+heap->offset;
  87         heap->offset += size;
  88         return tmp;
  89     }
  90
  91     if(size <= block_size(heap->last_block+1)) {
  92         if(heap->last_block+1 == heap->block_cnt) {
  93             tmp = heap_realloc(heap->blocks, (heap->block_cnt+1)*sizeof(void*));
  94             if(!tmp)
  95                 return NULL;
  96
  97             heap->blocks = tmp;
  98             heap->blocks[heap->block_cnt] = heap_alloc(block_size(heap->block_cnt));
  99             if(!heap->blocks[heap->block_cnt])
 100                 return NULL;
 101
 102             heap->block_cnt++;
 103         }
 104
 105         heap->last_block++;
 106         heap->offset = size;
 107         return heap->blocks[heap->last_block];
 108     }
 109
 110     list = heap_alloc(size + sizeof(struct list));
 111     if(!list)
 112         return NULL;
 113
 114     list_add_head(&heap->custom_blocks, list);
 115     return list+1;
 116 }
 117
 118 void *heap_pool_grow(heap_pool_t *heap, void *mem, DWORD size, DWORD inc)
 119 {
 120     void *ret;
 121
 122     if(mem == (BYTE*)heap->blocks[heap->last_block] + heap->offset-size
 123        && heap->offset+inc < block_size(heap->last_block)) {
 124         heap->offset += inc;
 125         return mem;
 126     }
 127
 128     ret = heap_pool_alloc(heap, size+inc);
 129     if(ret) /* FIXME: avoid copying for custom blocks */
 130         memcpy(ret, mem, size);
 131     return ret;
 132 }
 133
 134 void heap_pool_clear(heap_pool_t *heap)
 135 {
 136     struct list *tmp;
 137
 138     if(!heap)
 139         return;
 140
 141     while((tmp = list_head(&heap->custom_blocks))) {
 142         list_remove(tmp);
 143         heap_free(tmp);
 144     }
 145
 146     if(WARN_ON(heap)) {
 147         DWORD i;
 148
 149         for(i=0; i < heap->block_cnt; i++)
 150             memset(heap->blocks[i], ARENA_FREE_FILLER, block_size(i));
 151     }
 152
 153     heap->last_block = heap->offset = 0;
 154     heap->mark = FALSE;
 155 }
 156
 157 void heap_pool_free(heap_pool_t *heap)
 158 {
 159     DWORD i;
 160
 161     heap_pool_clear(heap);
 162
 163     for(i=0; i < heap->block_cnt; i++)
 164         heap_free(heap->blocks[i]);
 165     heap_free(heap->blocks);
 166
 167     heap_pool_init(heap);
 168 }
 169
 170 heap_pool_t *heap_pool_mark(heap_pool_t *heap)
 171 {
 172     if(heap->mark)
 173         return NULL;
 174
 175     heap->mark = TRUE;
 176     return heap;
 177 }
 178
 179 void jsval_release(jsval_t val)
 180 {
 181     switch(jsval_type(val)) {
 182     case JSV_OBJECT:
 183         if(get_object(val))
 184             IDispatch_Release(get_object(val));
 185         break;
 186     case JSV_STRING:
 187         jsstr_release(get_string(val));
 188         break;
 189     case JSV_VARIANT:
 190         VariantClear(get_variant(val));
 191         heap_free(get_variant(val));
 192         break;
 193     default:
 194         break;
 195     }
 196 }
 197
 198 static HRESULT jsval_variant(jsval_t *val, VARIANT *var)
 199 {
 200     VARIANT *v;
 201     HRESULT hres;
 202
 203     __JSVAL_TYPE(*val) = JSV_VARIANT;
 204     __JSVAL_VAR(*val) = v = heap_alloc(sizeof(VARIANT));
 205     if(!v) {
 206         *val = jsval_undefined();
 207         return E_OUTOFMEMORY;
 208     }
 209
 210     V_VT(v) = VT_EMPTY;
 211     hres = VariantCopy(v, var);
 212     if(FAILED(hres)) {
 213         *val = jsval_undefined();
 214         heap_free(v);
 215     }
 216     return hres;
 217 }
 218
 219 HRESULT jsval_copy(jsval_t v, jsval_t *r)
 220 {
 221     switch(jsval_type(v)) {
 222     case JSV_UNDEFINED:
 223     case JSV_NULL:
 224     case JSV_NUMBER:
 225     case JSV_BOOL:
 226         *r = v;
 227         return S_OK;
 228     case JSV_OBJECT:
 229         if(get_object(v))
 230             IDispatch_AddRef(get_object(v));
 231         *r = v;
 232         return S_OK;
 233     case JSV_STRING: {
 234         jsstr_addref(get_string(v));
 235         *r = v;
 236         return S_OK;
 237     }
 238     case JSV_VARIANT:
 239         return jsval_variant(r, get_variant(v));
 240     }
 241
 242     assert(0);
 243     return E_FAIL;
 244 }
 245
 246 HRESULT variant_to_jsval(VARIANT *var, jsval_t *r)
 247 {
 248     if(V_VT(var) == (VT_VARIANT|VT_BYREF))
 249         var = V_VARIANTREF(var);
 250
 251     switch(V_VT(var)) {
 252     case VT_EMPTY:
 253         *r = jsval_undefined();
 254         return S_OK;
 255     case VT_NULL:
 256         *r = jsval_null();
 257         return S_OK;
 258     case VT_BOOL:
 259         *r = jsval_bool(V_BOOL(var));
 260         return S_OK;
 261     case VT_I4:
 262         *r = jsval_number(V_I4(var));
 263         return S_OK;
 264     case VT_R8:
 265         *r = jsval_number(V_R8(var));
 266         return S_OK;
 267     case VT_BSTR: {
 268         jsstr_t *str;
 269
 270         if(V_BSTR(var)) {
 271             str = jsstr_alloc_len(V_BSTR(var), SysStringLen(V_BSTR(var)));
 272             if(!str)
 273                 return E_OUTOFMEMORY;
 274         }else {
 275             str = jsstr_null_bstr();
 276         }
 277
 278         *r = jsval_string(str);
 279         return S_OK;
 280     }
 281     case VT_DISPATCH: {
 282         if(V_DISPATCH(var))
 283             IDispatch_AddRef(V_DISPATCH(var));
 284         *r = jsval_disp(V_DISPATCH(var));
 285         return S_OK;
 286     }
 287     case VT_I2:
 288         *r = jsval_number(V_I2(var));
 289         return S_OK;
 290     case VT_INT:
 291         *r = jsval_number(V_INT(var));
 292         return S_OK;
 293     case VT_UI4:
 294         *r = jsval_number(V_UI4(var));
 295         return S_OK;
 296     case VT_UNKNOWN:
 297         if(V_UNKNOWN(var)) {
 298             IDispatch *disp;
 299             HRESULT hres;
 300
 301             hres = IUnknown_QueryInterface(V_UNKNOWN(var), &IID_IDispatch, (void**)&disp);
 302             if(SUCCEEDED(hres)) {
 303                 *r = jsval_disp(disp);
 304                 return S_OK;
 305             }
 306         }else {
 307             *r = jsval_disp(NULL);
 308             return S_OK;
 309         }
 310         /* fall through */
 311     default:
 312         return jsval_variant(r, var);
 313     }
 314 }
 315
 316 HRESULT jsval_to_variant(jsval_t val, VARIANT *retv)
 317 {
 318     switch(jsval_type(val)) {
 319     case JSV_UNDEFINED:
 320         V_VT(retv) = VT_EMPTY;
 321         return S_OK;
 322     case JSV_NULL:
 323         V_VT(retv) = VT_NULL;
 324         return S_OK;
 325     case JSV_OBJECT:
 326         V_VT(retv) = VT_DISPATCH;
 327         if(get_object(val))
 328             IDispatch_AddRef(get_object(val));
 329         V_DISPATCH(retv) = get_object(val);
 330         return S_OK;
 331     case JSV_STRING: {
 332         jsstr_t *str = get_string(val);
 333
 334         V_VT(retv) = VT_BSTR;
 335         if(is_null_bstr(str)) {
 336             V_BSTR(retv) = NULL;
 337         }else {
 338             V_BSTR(retv) = SysAllocStringLen(NULL, jsstr_length(str));
 339             if(V_BSTR(retv))
 340                 jsstr_flush(str, V_BSTR(retv));
 341             else
 342                 return E_OUTOFMEMORY;
 343         }
 344         return S_OK;
 345     }
 346     case JSV_NUMBER: {
 347         double n = get_number(val);
 348
 349         if(is_int32(n)) {
 350             V_VT(retv) = VT_I4;
 351             V_I4(retv) = n;
 352         }else {
 353             V_VT(retv) = VT_R8;
 354             V_R8(retv) = n;
 355         }
 356
 357         return S_OK;
 358     }
 359     case JSV_BOOL:
 360         V_VT(retv) = VT_BOOL;
 361         V_BOOL(retv) = get_bool(val) ? VARIANT_TRUE : VARIANT_FALSE;
 362         return S_OK;
 363     case JSV_VARIANT:
 364         V_VT(retv) = VT_EMPTY;
 365         return VariantCopy(retv, get_variant(val));
 366     }
 367
 368     assert(0);
 369     return E_FAIL;
 370 }
 371
 372 /* ECMA-262 3rd Edition    9.1 */
 373 HRESULT to_primitive(script_ctx_t *ctx, jsval_t val, jsval_t *ret, hint_t hint)
 374 {
 375     if(is_object_instance(val)) {
 376         jsdisp_t *jsdisp;
 377         jsval_t prim;
 378         DISPID id;
 379         HRESULT hres;
 380
 381         static const WCHAR toStringW[] = {'t','o','S','t','r','i','n','g',0};
 382         static const WCHAR valueOfW[] = {'v','a','l','u','e','O','f',0};
 383
 384         if(!get_object(val)) {
 385             *ret = jsval_null();
 386             return S_OK;
 387         }
 388
 389         jsdisp = iface_to_jsdisp(get_object(val));
 390         if(!jsdisp)
 391             return disp_propget(ctx, get_object(val), DISPID_VALUE, ret);
 392
 393         if(hint == NO_HINT)
 394             hint = is_class(jsdisp, JSCLASS_DATE) ? HINT_STRING : HINT_NUMBER;
 395
 396         /* Native implementation doesn't throw TypeErrors, returns strange values */
 397
 398         hres = jsdisp_get_id(jsdisp, hint == HINT_STRING ? toStringW : valueOfW, 0, &id);
 399         if(SUCCEEDED(hres)) {
 400             hres = jsdisp_call(jsdisp, id, DISPATCH_METHOD, 0, NULL, &prim);
 401             if(FAILED(hres)) {
 402                 WARN("call error - forwarding exception\n");
 403                 jsdisp_release(jsdisp);
 404                 return hres;
 405             }else if(!is_object_instance(prim)) {
 406                 jsdisp_release(jsdisp);
 407                 *ret = prim;
 408                 return S_OK;
 409             }else {
 410                 IDispatch_Release(get_object(prim));
 411             }
 412         }
 413
 414         hres = jsdisp_get_id(jsdisp, hint == HINT_STRING ? valueOfW : toStringW, 0, &id);
 415         if(SUCCEEDED(hres)) {
 416             hres = jsdisp_call(jsdisp, id, DISPATCH_METHOD, 0, NULL, &prim);
 417             if(FAILED(hres)) {
 418                 WARN("call error - forwarding exception\n");
 419                 jsdisp_release(jsdisp);
 420                 return hres;
 421             }else if(!is_object_instance(prim)) {
 422                 jsdisp_release(jsdisp);
 423                 *ret = prim;
 424                 return S_OK;
 425             }else {
 426                 IDispatch_Release(get_object(prim));
 427             }
 428         }
 429
 430         jsdisp_release(jsdisp);
 431
 432         WARN("failed\n");
 433         return throw_type_error(ctx, JS_E_TO_PRIMITIVE, NULL);
 434     }
 435
 436     return jsval_copy(val, ret);
 437
 438 }
 439
 440 /* ECMA-262 3rd Edition    9.2 */
 441 HRESULT to_boolean(jsval_t val, BOOL *ret)
 442 {
 443     switch(jsval_type(val)) {
 444     case JSV_UNDEFINED:
 445     case JSV_NULL:
 446         *ret = FALSE;
 447         return S_OK;
 448     case JSV_OBJECT:
 449         *ret = get_object(val) != NULL;
 450         return S_OK;
 451     case JSV_STRING:
 452         *ret = jsstr_length(get_string(val)) != 0;
 453         return S_OK;
 454     case JSV_NUMBER:
 455         *ret = !isnan(get_number(val)) && get_number(val);
 456         return S_OK;
 457     case JSV_BOOL:
 458         *ret = get_bool(val);
 459         return S_OK;
 460     case JSV_VARIANT:
 461         FIXME("unimplemented for variant %s\n", debugstr_variant(get_variant(val)));
 462         return E_NOTIMPL;
 463     }
 464
 465     assert(0);
 466     return E_FAIL;
 467 }
 468
 469 static int hex_to_int(WCHAR c)
 470 {
 471     if('0' <= c && c <= '9')
 472         return c-'0';
 473
 474     if('a' <= c && c <= 'f')
 475         return c-'a'+10;
 476
 477     if('A' <= c && c <= 'F')
 478         return c-'A'+10;
 479
 480     return -1;
 481 }
 482
 483 /* ECMA-262 3rd Edition    9.3.1 */
 484 static HRESULT str_to_number(jsstr_t *str, double *ret)
 485 {
 486     const WCHAR *ptr;
 487     BOOL neg = FALSE;
 488     DOUBLE d = 0.0;
 489
 490     static const WCHAR infinityW[] = {'I','n','f','i','n','i','t','y'};
 491
 492     ptr = jsstr_flatten(str);
 493     if(!ptr)
 494         return E_OUTOFMEMORY;
 495
 496     while(isspaceW(*ptr))
 497         ptr++;
 498
 499     if(*ptr == '-') {
 500         neg = TRUE;
 501         ptr++;
 502     }else if(*ptr == '+') {
 503         ptr++;
 504     }
 505
 506     if(!strncmpW(ptr, infinityW, sizeof(infinityW)/sizeof(WCHAR))) {
 507         ptr += sizeof(infinityW)/sizeof(WCHAR);
 508         while(*ptr && isspaceW(*ptr))
 509             ptr++;
 510
 511         if(*ptr)
 512             *ret = NAN;
 513         else
 514             *ret = neg ? -INFINITY : INFINITY;
 515         return S_OK;
 516     }
 517
 518     if(*ptr == '0' && ptr[1] == 'x') {
 519         DWORD l = 0;
 520
 521         ptr += 2;
 522         while((l = hex_to_int(*ptr)) != -1) {
 523             d = d*16 + l;
 524             ptr++;
 525         }
 526
 527         *ret = d;
 528         return S_OK;
 529     }
 530
 531     while(isdigitW(*ptr))
 532         d = d*10 + (*ptr++ - '0');
 533
 534     if(*ptr == 'e' || *ptr == 'E') {
 535         BOOL eneg = FALSE;
 536         LONG l = 0;
 537
 538         ptr++;
 539         if(*ptr == '-') {
 540             ptr++;
 541             eneg = TRUE;
 542         }else if(*ptr == '+') {
 543             ptr++;
 544         }
 545
 546         while(isdigitW(*ptr))
 547             l = l*10 + (*ptr++ - '0');
 548         if(eneg)
 549             l = -l;
 550
 551         d *= pow(10, l);
 552     }else if(*ptr == '.') {
 553         DOUBLE dec = 0.1;
 554
 555         ptr++;
 556         while(isdigitW(*ptr)) {
 557             d += dec * (*ptr++ - '0');
 558             dec *= 0.1;
 559         }
 560     }
 561
 562     while(isspaceW(*ptr))
 563         ptr++;
 564
 565     if(*ptr) {
 566         *ret = NAN;
 567         return S_OK;
 568     }
 569
 570     if(neg)
 571         d = -d;
 572
 573     *ret = d;
 574     return S_OK;
 575 }
 576
 577 /* ECMA-262 3rd Edition    9.3 */
 578 HRESULT to_number(script_ctx_t *ctx, jsval_t val, double *ret)
 579 {
 580     switch(jsval_type(val)) {
 581     case JSV_UNDEFINED:
 582         *ret = NAN;
 583         return S_OK;
 584     case JSV_NULL:
 585         *ret = 0;
 586         return S_OK;
 587     case JSV_NUMBER:
 588         *ret = get_number(val);
 589         return S_OK;
 590     case JSV_STRING:
 591         return str_to_number(get_string(val), ret);
 592     case JSV_OBJECT: {
 593         jsval_t prim;
 594         HRESULT hres;
 595
 596         hres = to_primitive(ctx, val, &prim, HINT_NUMBER);
 597         if(FAILED(hres))
 598             return hres;
 599
 600         hres = to_number(ctx, prim, ret);
 601         jsval_release(prim);
 602         return hres;
 603     }
 604     case JSV_BOOL:
 605         *ret = get_bool(val) ? 1 : 0;
 606         return S_OK;
 607     case JSV_VARIANT:
 608         FIXME("unimplemented for variant %s\n", debugstr_variant(get_variant(val)));
 609         return E_NOTIMPL;
 610     };
 611
 612     assert(0);
 613     return E_FAIL;
 614 }
 615
 616 /* ECMA-262 3rd Edition    9.4 */
 617 HRESULT to_integer(script_ctx_t *ctx, jsval_t v, double *ret)
 618 {
 619     double n;
 620     HRESULT hres;
 621
 622     hres = to_number(ctx, v, &n);
 623     if(FAILED(hres))
 624         return hres;
 625
 626     if(isnan(n))
 627         *ret = 0;
 628     else
 629         *ret = n >= 0.0 ? floor(n) : -floor(-n);
 630     return S_OK;
 631 }
 632
 633 /* ECMA-262 3rd Edition    9.5 */
 634 HRESULT to_int32(script_ctx_t *ctx, jsval_t v, INT *ret)
 635 {
 636     double n;
 637     HRESULT hres;
 638
 639     hres = to_number(ctx, v, &n);
 640     if(FAILED(hres))
 641         return hres;
 642
 643     *ret = is_finite(n) ? n : 0;
 644     return S_OK;
 645 }
 646
 647 /* ECMA-262 3rd Edition    9.6 */
 648 HRESULT to_uint32(script_ctx_t *ctx, jsval_t val, DWORD *ret)
 649 {
 650     INT32 n;
 651     HRESULT hres;
 652
 653     hres = to_int32(ctx, val, &n);
 654     if(SUCCEEDED(hres))
 655         *ret = n;
 656     return hres;
 657 }
 658
 659 static jsstr_t *int_to_string(int i)
 660 {
 661     WCHAR buf[12], *p;
 662     BOOL neg = FALSE;
 663
 664     if(!i) {
 665         static const WCHAR zeroW[] = {'0',0};
 666         return jsstr_alloc(zeroW);
 667     }
 668
 669     if(i < 0) {
 670         neg = TRUE;
 671         i = -i;
 672     }
 673
 674     p = buf + sizeof(buf)/sizeof(*buf)-1;
 675     *p-- = 0;
 676     while(i) {
 677         *p-- = i%10 + '0';
 678         i /= 10;
 679     }
 680
 681     if(neg)
 682         *p = '-';
 683     else
 684         p++;
 685
 686     return jsstr_alloc(p);
 687 }
 688
 689 HRESULT double_to_string(double n, jsstr_t **str)
 690 {
 691     const WCHAR InfinityW[] = {'-','I','n','f','i','n','i','t','y',0};
 692
 693     if(isnan(n)) {
 694         *str = jsstr_nan();
 695     }else if(isinf(n)) {
 696         *str = jsstr_alloc(n<0 ? InfinityW : InfinityW+1);
 697     }else if(is_int32(n)) {
 698         *str = int_to_string(n);
 699     }else {
 700         VARIANT strv, v;
 701         HRESULT hres;
 702
 703         /* FIXME: Don't use VariantChangeTypeEx */
 704         V_VT(&v) = VT_R8;
 705         V_R8(&v) = n;
 706         V_VT(&strv) = VT_EMPTY;
 707         hres = VariantChangeTypeEx(&strv, &v, MAKELCID(MAKELANGID(LANG_ENGLISH,SUBLANG_ENGLISH_US),SORT_DEFAULT), 0, VT_BSTR);
 708         if(FAILED(hres))
 709             return hres;
 710
 711         *str = jsstr_alloc(V_BSTR(&strv));
 712         SysFreeString(V_BSTR(&strv));
 713     }
 714
 715     return *str ? S_OK : E_OUTOFMEMORY;
 716 }
 717
 718 /* ECMA-262 3rd Edition    9.8 */
 719 HRESULT to_string(script_ctx_t *ctx, jsval_t val, jsstr_t **str)
 720 {
 721     const WCHAR nullW[] = {'n','u','l','l',0};
 722     const WCHAR trueW[] = {'t','r','u','e',0};
 723     const WCHAR falseW[] = {'f','a','l','s','e',0};
 724
 725     switch(jsval_type(val)) {
 726     case JSV_UNDEFINED:
 727         *str = jsstr_undefined();
 728         return S_OK;
 729     case JSV_NULL:
 730         *str = jsstr_alloc(nullW);
 731         break;
 732     case JSV_NUMBER:
 733         return double_to_string(get_number(val), str);
 734     case JSV_STRING:
 735         *str = jsstr_addref(get_string(val));
 736         break;
 737     case JSV_OBJECT: {
 738         jsval_t prim;
 739         HRESULT hres;
 740
 741         hres = to_primitive(ctx, val, &prim, HINT_STRING);
 742         if(FAILED(hres))
 743             return hres;
 744
 745         hres = to_string(ctx, prim, str);
 746         jsval_release(prim);
 747         return hres;
 748     }
 749     case JSV_BOOL:
 750         *str = jsstr_alloc(get_bool(val) ? trueW : falseW);
 751         break;
 752     default:
 753         FIXME("unsupported %s\n", debugstr_jsval(val));
 754         return E_NOTIMPL;
 755     }
 756
 757     return *str ? S_OK : E_OUTOFMEMORY;
 758 }
 759
 760 HRESULT to_flat_string(script_ctx_t *ctx, jsval_t val, jsstr_t **str, const WCHAR **ret_str)
 761 {
 762     HRESULT hres;
 763
 764     hres = to_string(ctx, val, str);
 765     if(FAILED(hres))
 766         return hres;
 767
 768     *ret_str = jsstr_flatten(*str);
 769     if(!*ret_str) {
 770         jsstr_release(*str);
 771         return E_OUTOFMEMORY;
 772     }
 773
 774     return S_OK;
 775 }
 776
 777 /* ECMA-262 3rd Edition    9.9 */
 778 HRESULT to_object(script_ctx_t *ctx, jsval_t val, IDispatch **disp)
 779 {
 780     jsdisp_t *dispex;
 781     HRESULT hres;
 782
 783     switch(jsval_type(val)) {
 784     case JSV_STRING:
 785         hres = create_string(ctx, get_string(val), &dispex);
 786         if(FAILED(hres))
 787             return hres;
 788
 789         *disp = to_disp(dispex);
 790         break;
 791     case JSV_NUMBER:
 792         hres = create_number(ctx, get_number(val), &dispex);
 793         if(FAILED(hres))
 794             return hres;
 795
 796         *disp = to_disp(dispex);
 797         break;
 798     case JSV_OBJECT:
 799         if(get_object(val)) {
 800             *disp = get_object(val);
 801             IDispatch_AddRef(*disp);
 802         }else {
 803             jsdisp_t *obj;
 804
 805             hres = create_object(ctx, NULL, &obj);
 806             if(FAILED(hres))
 807                 return hres;
 808
 809             *disp = to_disp(obj);
 810         }
 811         break;
 812     case JSV_BOOL:
 813         hres = create_bool(ctx, get_bool(val), &dispex);
 814         if(FAILED(hres))
 815             return hres;
 816
 817         *disp = to_disp(dispex);
 818         break;
 819     case JSV_UNDEFINED:
 820     case JSV_NULL:
 821         WARN("object expected\n");
 822         return throw_type_error(ctx, JS_E_OBJECT_EXPECTED, NULL);
 823     case JSV_VARIANT:
 824         switch(V_VT(get_variant(val))) {
 825         case VT_ARRAY|VT_VARIANT:
 826             hres = create_vbarray(ctx, V_ARRAY(get_variant(val)), &dispex);
 827             if(FAILED(hres))
 828                 return hres;
 829
 830             *disp = to_disp(dispex);
 831             break;
 832
 833         default:
 834             FIXME("Unsupported %s\n", debugstr_variant(get_variant(val)));
 835             return E_NOTIMPL;
 836         }
 837         break;
 838     }
 839
 840     return S_OK;
 841 }
 842
 843 HRESULT variant_change_type(script_ctx_t *ctx, VARIANT *dst, VARIANT *src, VARTYPE vt)
 844 {
 845     jsval_t val;
 846     HRESULT hres;
 847
 848     clear_ei(ctx);
 849     hres = variant_to_jsval(src, &val);
 850     if(FAILED(hres))
 851         return hres;
 852
 853     switch(vt) {
 854     case VT_I2:
 855     case VT_I4: {
 856         INT i;
 857
 858         hres = to_int32(ctx, val, &i);
 859         if(SUCCEEDED(hres)) {
 860             if(vt == VT_I4)
 861                 V_I4(dst) = i;
 862             else
 863                 V_I2(dst) = i;
 864         }
 865         break;
 866     }
 867     case VT_R8: {
 868         double n;
 869         hres = to_number(ctx, val, &n);
 870         if(SUCCEEDED(hres))
 871             V_R8(dst) = n;
 872         break;
 873     }
 874     case VT_R4: {
 875         double n;
 876
 877         hres = to_number(ctx, val, &n);
 878         if(SUCCEEDED(hres))
 879             V_R4(dst) = n;
 880         break;
 881     }
 882     case VT_BOOL: {
 883         BOOL b;
 884
 885         hres = to_boolean(val, &b);
 886         if(SUCCEEDED(hres))
 887             V_BOOL(dst) = b ? VARIANT_TRUE : VARIANT_FALSE;
 888         break;
 889     }
 890     case VT_BSTR: {
 891         jsstr_t *str;
 892
 893         hres = to_string(ctx, val, &str);
 894         if(FAILED(hres))
 895             break;
 896
 897         if(is_null_bstr(str)) {
 898             V_BSTR(dst) = NULL;
 899             break;
 900         }
 901
 902         V_BSTR(dst) = SysAllocStringLen(NULL, jsstr_length(str));
 903         if(V_BSTR(dst))
 904             jsstr_flush(str, V_BSTR(dst));
 905         else
 906             hres = E_OUTOFMEMORY;
 907         break;
 908     }
 909     case VT_EMPTY:
 910         hres = V_VT(src) == VT_EMPTY ? S_OK : E_NOTIMPL;
 911         break;
 912     case VT_NULL:
 913         hres = V_VT(src) == VT_NULL ? S_OK : E_NOTIMPL;
 914         break;
 915     default:
 916         FIXME("vt %d not implemented\n", vt);
 917         hres = E_NOTIMPL;
 918     }
 919
 920     jsval_release(val);
 921     if(FAILED(hres))
 922         return hres;
 923
 924     V_VT(dst) = vt;
 925     return S_OK;
 926 }
 927
 928 static inline JSCaller *impl_from_IServiceProvider(IServiceProvider *iface)
 929 {
 930     return CONTAINING_RECORD(iface, JSCaller, IServiceProvider_iface);
 931 }
 932
 933 static HRESULT WINAPI JSCaller_QueryInterface(IServiceProvider *iface, REFIID riid, void **ppv)
 934 {
 935     JSCaller *This = impl_from_IServiceProvider(iface);
 936
 937     if(IsEqualGUID(&IID_IUnknown, riid)) {
 938         TRACE("(%p)->(IID_IUnknown %p)\n", This, ppv);
 939         *ppv = &This->IServiceProvider_iface;
 940     }else if(IsEqualGUID(&IID_IServiceProvider, riid)) {
 941         TRACE("(%p)->(IID_IServiceProvider %p)\n", This, ppv);
 942         *ppv = &This->IServiceProvider_iface;
 943     }else {
 944         WARN("(%p)->(%s %p)\n", This, debugstr_guid(riid), ppv);
 945         *ppv = NULL;
 946         return E_NOINTERFACE;
 947     }
 948
 949     IUnknown_AddRef((IUnknown*)*ppv);
 950     return S_OK;
 951 }
 952
 953 static ULONG WINAPI JSCaller_AddRef(IServiceProvider *iface)
 954 {
 955     JSCaller *This = impl_from_IServiceProvider(iface);
 956     LONG ref = InterlockedIncrement(&This->ref);
 957
 958     TRACE("(%p) ref=%d\n", This, ref);
 959
 960     return ref;
 961 }
 962
 963 static ULONG WINAPI JSCaller_Release(IServiceProvider *iface)
 964 {
 965     JSCaller *This = impl_from_IServiceProvider(iface);
 966     LONG ref = InterlockedIncrement(&This->ref);
 967
 968     TRACE("(%p) ref=%d\n", This, ref);
 969
 970     if(!ref) {
 971         assert(!This->ctx);
 972         heap_free(This);
 973     }
 974
 975     return ref;
 976 }
 977
 978 static HRESULT WINAPI JSCaller_QueryService(IServiceProvider *iface, REFGUID guidService,
 979         REFIID riid, void **ppv)
 980 {
 981     JSCaller *This = impl_from_IServiceProvider(iface);
 982
 983     if(IsEqualGUID(guidService, &SID_VariantConversion) && This->ctx && This->ctx->active_script) {
 984         TRACE("(%p)->(SID_VariantConversion)\n", This);
 985         return IActiveScript_QueryInterface(This->ctx->active_script, riid, ppv);
 986     }
 987
 988     FIXME("(%p)->(%s %s %p)\n", This, debugstr_guid(guidService), debugstr_guid(riid), ppv);
 989
 990     *ppv = NULL;
 991     return E_NOINTERFACE;
 992 }
 993
 994 static const IServiceProviderVtbl ServiceProviderVtbl = {
 995     JSCaller_QueryInterface,
 996     JSCaller_AddRef,
 997     JSCaller_Release,
 998     JSCaller_QueryService
 999 };
1000
1001 HRESULT create_jscaller(script_ctx_t *ctx)
1002 {
1003     JSCaller *ret;
1004
1005     ret = heap_alloc(sizeof(*ret));
1006     if(!ret)
1007         return E_OUTOFMEMORY;
1008
1009     ret->IServiceProvider_iface.lpVtbl = &ServiceProviderVtbl;
1010     ret->ref = 1;
1011     ret->ctx = ctx;
1012
1013     ctx->jscaller = ret;
1014     return S_OK;
1015 }