dlls/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 "config.h"
  20 #include "wine/port.h"
  21
  22 #include <math.h>
  23 #include <assert.h>
  24
  25 #include "jscript.h"
  26 #include "engine.h"
  27
  28 #include "wine/debug.h"
  29
  30 WINE_DEFAULT_DEBUG_CHANNEL(jscript);
  31 WINE_DECLARE_DEBUG_CHANNEL(heap);
  32
  33 const char *debugstr_variant(const VARIANT *v)
  34 {
  35     if(!v)
  36         return "(null)";
  37
  38     switch(V_VT(v)) {
  39     case VT_EMPTY:
  40         return "{VT_EMPTY}";
  41     case VT_NULL:
  42         return "{VT_NULL}";
  43     case VT_I4:
  44         return wine_dbg_sprintf("{VT_I4: %d}", V_I4(v));
  45     case VT_UI4:
  46         return wine_dbg_sprintf("{VT_UI4: %u}", V_UI4(v));
  47     case VT_R8:
  48         return wine_dbg_sprintf("{VT_R8: %lf}", V_R8(v));
  49     case VT_BSTR:
  50         return wine_dbg_sprintf("{VT_BSTR: %s}", debugstr_w(V_BSTR(v)));
  51     case VT_DISPATCH:
  52         return wine_dbg_sprintf("{VT_DISPATCH: %p}", V_DISPATCH(v));
  53     case VT_BOOL:
  54         return wine_dbg_sprintf("{VT_BOOL: %x}", V_BOOL(v));
  55     default:
  56         return wine_dbg_sprintf("{vt %d}", V_VT(v));
  57     }
  58 }
  59
  60 #define MIN_BLOCK_SIZE  128
  61 #define ARENA_FREE_FILLER  0xaa
  62
  63 static inline DWORD block_size(DWORD block)
  64 {
  65     return MIN_BLOCK_SIZE << block;
  66 }
  67
  68 void jsheap_init(jsheap_t *heap)
  69 {
  70     memset(heap, 0, sizeof(*heap));
  71     list_init(&heap->custom_blocks);
  72 }
  73
  74 void *jsheap_alloc(jsheap_t *heap, DWORD size)
  75 {
  76     struct list *list;
  77     void *tmp;
  78
  79     if(!heap->block_cnt) {
  80         if(!heap->blocks) {
  81             heap->blocks = heap_alloc(sizeof(void*));
  82             if(!heap->blocks)
  83                 return NULL;
  84         }
  85
  86         tmp = heap_alloc(block_size(0));
  87         if(!tmp)
  88             return NULL;
  89
  90         heap->blocks[0] = tmp;
  91         heap->block_cnt = 1;
  92     }
  93
  94     if(heap->offset + size <= block_size(heap->last_block)) {
  95         tmp = ((BYTE*)heap->blocks[heap->last_block])+heap->offset;
  96         heap->offset += size;
  97         return tmp;
  98     }
  99
 100     if(size <= block_size(heap->last_block+1)) {
 101         if(heap->last_block+1 == heap->block_cnt) {
 102             tmp = heap_realloc(heap->blocks, (heap->block_cnt+1)*sizeof(void*));
 103             if(!tmp)
 104                 return NULL;
 105
 106             heap->blocks = tmp;
 107             heap->blocks[heap->block_cnt] = heap_alloc(block_size(heap->block_cnt));
 108             if(!heap->blocks[heap->block_cnt])
 109                 return NULL;
 110
 111             heap->block_cnt++;
 112         }
 113
 114         heap->last_block++;
 115         heap->offset = size;
 116         return heap->blocks[heap->last_block];
 117     }
 118
 119     list = heap_alloc(size + sizeof(struct list));
 120     if(!list)
 121         return NULL;
 122
 123     list_add_head(&heap->custom_blocks, list);
 124     return list+1;
 125 }
 126
 127 void *jsheap_grow(jsheap_t *heap, void *mem, DWORD size, DWORD inc)
 128 {
 129     void *ret;
 130
 131     if(mem == (BYTE*)heap->blocks[heap->last_block] + heap->offset-size
 132        && heap->offset+inc < block_size(heap->last_block)) {
 133         heap->offset += inc;
 134         return mem;
 135     }
 136
 137     ret = jsheap_alloc(heap, size+inc);
 138     if(ret) /* FIXME: avoid copying for custom blocks */
 139         memcpy(ret, mem, size);
 140     return ret;
 141 }
 142
 143 void jsheap_clear(jsheap_t *heap)
 144 {
 145     struct list *tmp;
 146
 147     if(!heap)
 148         return;
 149
 150     while((tmp = list_next(&heap->custom_blocks, &heap->custom_blocks))) {
 151         list_remove(tmp);
 152         heap_free(tmp);
 153     }
 154
 155     if(WARN_ON(heap)) {
 156         DWORD i;
 157
 158         for(i=0; i < heap->block_cnt; i++)
 159             memset(heap->blocks[i], ARENA_FREE_FILLER, block_size(i));
 160     }
 161
 162     heap->last_block = heap->offset = 0;
 163     heap->mark = FALSE;
 164 }
 165
 166 void jsheap_free(jsheap_t *heap)
 167 {
 168     DWORD i;
 169
 170     jsheap_clear(heap);
 171
 172     for(i=0; i < heap->block_cnt; i++)
 173         heap_free(heap->blocks[i]);
 174     heap_free(heap->blocks);
 175
 176     jsheap_init(heap);
 177 }
 178
 179 jsheap_t *jsheap_mark(jsheap_t *heap)
 180 {
 181     if(heap->mark)
 182         return NULL;
 183
 184     heap->mark = TRUE;
 185     return heap;
 186 }
 187
 188 /* ECMA-262 3rd Edition    9.1 */
 189 HRESULT to_primitive(script_ctx_t *ctx, VARIANT *v, jsexcept_t *ei, VARIANT *ret, hint_t hint)
 190 {
 191     switch(V_VT(v)) {
 192     case VT_EMPTY:
 193     case VT_NULL:
 194     case VT_BOOL:
 195     case VT_I4:
 196     case VT_R8:
 197         *ret = *v;
 198         break;
 199     case VT_BSTR:
 200         V_VT(ret) = VT_BSTR;
 201         V_BSTR(ret) = SysAllocString(V_BSTR(v));
 202         break;
 203     case VT_DISPATCH: {
 204         jsdisp_t *jsdisp;
 205         DISPID id;
 206         HRESULT hres;
 207
 208         static const WCHAR toStringW[] = {'t','o','S','t','r','i','n','g',0};
 209         static const WCHAR valueOfW[] = {'v','a','l','u','e','O','f',0};
 210
 211         if(!V_DISPATCH(v)) {
 212             V_VT(ret) = VT_NULL;
 213             break;
 214         }
 215
 216         jsdisp = iface_to_jsdisp((IUnknown*)V_DISPATCH(v));
 217         if(!jsdisp) {
 218             V_VT(ret) = VT_EMPTY;
 219             return disp_propget(ctx, V_DISPATCH(v), DISPID_VALUE, ret, ei);
 220         }
 221
 222         if(hint == NO_HINT)
 223             hint = is_class(jsdisp, JSCLASS_DATE) ? HINT_STRING : HINT_NUMBER;
 224
 225         /* Native implementation doesn't throw TypeErrors, returns strange values */
 226
 227         hres = jsdisp_get_id(jsdisp, hint == HINT_STRING ? toStringW : valueOfW, 0, &id);
 228         if(SUCCEEDED(hres)) {
 229             hres = jsdisp_call(jsdisp, id, DISPATCH_METHOD, 0, NULL, ret, ei);
 230             if(FAILED(hres)) {
 231                 WARN("call error - forwarding exception\n");
 232                 jsdisp_release(jsdisp);
 233                 return hres;
 234             }
 235             else if(V_VT(ret) != VT_DISPATCH) {
 236                 jsdisp_release(jsdisp);
 237                 return S_OK;
 238             }
 239             else
 240                 IDispatch_Release(V_DISPATCH(ret));
 241         }
 242
 243         hres = jsdisp_get_id(jsdisp, hint == HINT_STRING ? valueOfW : toStringW, 0, &id);
 244         if(SUCCEEDED(hres)) {
 245             hres = jsdisp_call(jsdisp, id, DISPATCH_METHOD, 0, NULL, ret, ei);
 246             if(FAILED(hres)) {
 247                 WARN("call error - forwarding exception\n");
 248                 jsdisp_release(jsdisp);
 249                 return hres;
 250             }
 251             else if(V_VT(ret) != VT_DISPATCH) {
 252                 jsdisp_release(jsdisp);
 253                 return S_OK;
 254             }
 255             else
 256                 IDispatch_Release(V_DISPATCH(ret));
 257         }
 258
 259         jsdisp_release(jsdisp);
 260
 261         WARN("failed\n");
 262         return throw_type_error(ctx, ei, JS_E_TO_PRIMITIVE, NULL);
 263     }
 264     case VT_I2:
 265     case VT_INT:
 266         assert(0);
 267     default:
 268         FIXME("Unimplemented for vt %d\n", V_VT(v));
 269         return E_NOTIMPL;
 270     }
 271
 272     return S_OK;
 273 }
 274
 275 /* ECMA-262 3rd Edition    9.2 */
 276 HRESULT to_boolean(VARIANT *v, VARIANT_BOOL *b)
 277 {
 278     switch(V_VT(v)) {
 279     case VT_EMPTY:
 280     case VT_NULL:
 281         *b = VARIANT_FALSE;
 282         break;
 283     case VT_I4:
 284         *b = V_I4(v) ? VARIANT_TRUE : VARIANT_FALSE;
 285         break;
 286     case VT_R8:
 287         if(isnan(V_R8(v))) *b = VARIANT_FALSE;
 288         else *b = V_R8(v) ? VARIANT_TRUE : VARIANT_FALSE;
 289         break;
 290     case VT_BSTR:
 291         *b = V_BSTR(v) && *V_BSTR(v) ? VARIANT_TRUE : VARIANT_FALSE;
 292         break;
 293     case VT_DISPATCH:
 294         *b = V_DISPATCH(v) ? VARIANT_TRUE : VARIANT_FALSE;
 295         break;
 296     case VT_BOOL:
 297         *b = V_BOOL(v);
 298         break;
 299     default:
 300         FIXME("unimplemented for vt %d\n", V_VT(v));
 301         return E_NOTIMPL;
 302     }
 303
 304     return S_OK;
 305 }
 306
 307 static int hex_to_int(WCHAR c)
 308 {
 309     if('0' <= c && c <= '9')
 310         return c-'0';
 311
 312     if('a' <= c && c <= 'f')
 313         return c-'a'+10;
 314
 315     if('A' <= c && c <= 'F')
 316         return c-'A'+10;
 317
 318     return -1;
 319 }
 320
 321 /* ECMA-262 3rd Edition    9.3.1 */
 322 static HRESULT str_to_number(BSTR str, double *ret)
 323 {
 324     const WCHAR *ptr = str;
 325     BOOL neg = FALSE;
 326     DOUBLE d = 0.0;
 327
 328     static const WCHAR infinityW[] = {'I','n','f','i','n','i','t','y'};
 329
 330     if(!ptr) {
 331         *ret = 0;
 332         return S_OK;
 333     }
 334
 335     while(isspaceW(*ptr))
 336         ptr++;
 337
 338     if(*ptr == '-') {
 339         neg = TRUE;
 340         ptr++;
 341     }else if(*ptr == '+') {
 342         ptr++;
 343     }
 344
 345     if(!strncmpW(ptr, infinityW, sizeof(infinityW)/sizeof(WCHAR))) {
 346         ptr += sizeof(infinityW)/sizeof(WCHAR);
 347         while(*ptr && isspaceW(*ptr))
 348             ptr++;
 349
 350         if(*ptr)
 351             *ret = NAN;
 352         else
 353             *ret = neg ? -INFINITY : INFINITY;
 354         return S_OK;
 355     }
 356
 357     if(*ptr == '0' && ptr[1] == 'x') {
 358         DWORD l = 0;
 359
 360         ptr += 2;
 361         while((l = hex_to_int(*ptr)) != -1) {
 362             d = d*16 + l;
 363             ptr++;
 364         }
 365
 366         *ret = d;
 367         return S_OK;
 368     }
 369
 370     while(isdigitW(*ptr))
 371         d = d*10 + (*ptr++ - '0');
 372
 373     if(*ptr == 'e' || *ptr == 'E') {
 374         BOOL eneg = FALSE;
 375         LONG l = 0;
 376
 377         ptr++;
 378         if(*ptr == '-') {
 379             ptr++;
 380             eneg = TRUE;
 381         }else if(*ptr == '+') {
 382             ptr++;
 383         }
 384
 385         while(isdigitW(*ptr))
 386             l = l*10 + (*ptr++ - '0');
 387         if(eneg)
 388             l = -l;
 389
 390         d *= pow(10, l);
 391     }else if(*ptr == '.') {
 392         DOUBLE dec = 0.1;
 393
 394         ptr++;
 395         while(isdigitW(*ptr)) {
 396             d += dec * (*ptr++ - '0');
 397             dec *= 0.1;
 398         }
 399     }
 400
 401     while(isspaceW(*ptr))
 402         ptr++;
 403
 404     if(*ptr) {
 405         *ret = NAN;
 406         return S_OK;
 407     }
 408
 409     if(neg)
 410         d = -d;
 411
 412     *ret = d;
 413     return S_OK;
 414 }
 415
 416 /* ECMA-262 3rd Edition    9.3 */
 417 HRESULT to_number(script_ctx_t *ctx, VARIANT *v, jsexcept_t *ei, double *ret)
 418 {
 419     switch(V_VT(v)) {
 420     case VT_EMPTY:
 421         *ret = NAN;
 422         break;
 423     case VT_NULL:
 424         *ret = 0;
 425         break;
 426     case VT_I4:
 427         *ret = V_I4(v);
 428         break;
 429     case VT_R8:
 430         *ret = V_R8(v);
 431         break;
 432     case VT_BSTR:
 433         return str_to_number(V_BSTR(v), ret);
 434     case VT_DISPATCH: {
 435         VARIANT prim;
 436         HRESULT hres;
 437
 438         hres = to_primitive(ctx, v, ei, &prim, HINT_NUMBER);
 439         if(FAILED(hres))
 440             return hres;
 441
 442         hres = to_number(ctx, &prim, ei, ret);
 443         VariantClear(&prim);
 444         return hres;
 445     }
 446     case VT_BOOL:
 447         *ret = V_BOOL(v) ? 1 : 0;
 448         break;
 449     case VT_I2:
 450     case VT_INT:
 451         assert(0);
 452     default:
 453         FIXME("unimplemented for vt %d\n", V_VT(v));
 454         return E_NOTIMPL;
 455     }
 456
 457     return S_OK;
 458 }
 459
 460 /* ECMA-262 3rd Edition    9.4 */
 461 HRESULT to_integer(script_ctx_t *ctx, VARIANT *v, jsexcept_t *ei, double *ret)
 462 {
 463     double n;
 464     HRESULT hres;
 465
 466     if(V_VT(v) == VT_I4) {
 467         *ret = V_I4(v);
 468         return S_OK;
 469     }
 470
 471     hres = to_number(ctx, v, ei, &n);
 472     if(FAILED(hres))
 473         return hres;
 474
 475     if(isnan(n))
 476         *ret = 0;
 477     else
 478         *ret = n >= 0.0 ? floor(n) : -floor(-n);
 479     return S_OK;
 480 }
 481
 482 /* ECMA-262 3rd Edition    9.5 */
 483 HRESULT to_int32(script_ctx_t *ctx, VARIANT *v, jsexcept_t *ei, INT *ret)
 484 {
 485     double n;
 486     HRESULT hres;
 487
 488     if(V_VT(v) == VT_I4) {
 489         *ret = V_I4(v);
 490         return S_OK;
 491     }
 492
 493     hres = to_number(ctx, v, ei, &n);
 494     if(FAILED(hres))
 495         return hres;
 496
 497     *ret = isnan(n) || isinf(n) ? 0 : n;
 498     return S_OK;
 499 }
 500
 501 /* ECMA-262 3rd Edition    9.6 */
 502 HRESULT to_uint32(script_ctx_t *ctx, VARIANT *v, jsexcept_t *ei, DWORD *ret)
 503 {
 504     double n;
 505     HRESULT hres;
 506
 507     if(V_VT(v) == VT_I4) {
 508         *ret = V_I4(v);
 509         return S_OK;
 510     }
 511
 512     hres = to_number(ctx, v, ei, &n);
 513     if(FAILED(hres))
 514         return hres;
 515
 516     *ret = isnan(n) || isinf(n) ? 0 : n;
 517     return S_OK;
 518 }
 519
 520 static BSTR int_to_bstr(int i)
 521 {
 522     WCHAR buf[12], *p;
 523     BOOL neg = FALSE;
 524
 525     if(!i) {
 526         static const WCHAR zeroW[] = {'0',0};
 527         return SysAllocString(zeroW);
 528     }
 529
 530     if(i < 0) {
 531         neg = TRUE;
 532         i = -i;
 533     }
 534
 535     p = buf + sizeof(buf)/sizeof(*buf)-1;
 536     *p-- = 0;
 537     while(i) {
 538         *p-- = i%10 + '0';
 539         i /= 10;
 540     }
 541
 542     if(neg)
 543         *p = '-';
 544     else
 545         p++;
 546
 547     return SysAllocString(p);
 548 }
 549
 550 HRESULT double_to_bstr(double n, BSTR *str)
 551 {
 552     const WCHAR NaNW[] = {'N','a','N',0};
 553     const WCHAR InfinityW[] = {'-','I','n','f','i','n','i','t','y',0};
 554
 555     if(isnan(n)) {
 556        *str = SysAllocString(NaNW);
 557     }else if(isinf(n)) {
 558         *str = SysAllocString(n<0 ? InfinityW : InfinityW+1);
 559     }else {
 560         VARIANT strv, v;
 561         HRESULT hres;
 562
 563         V_VT(&v) = VT_R8;
 564         V_R8(&v) = n;
 565         V_VT(&strv) = VT_EMPTY;
 566         hres = VariantChangeTypeEx(&strv, &v, MAKELCID(MAKELANGID(LANG_ENGLISH,SUBLANG_ENGLISH_US),SORT_DEFAULT), 0, VT_BSTR);
 567         if(FAILED(hres))
 568             return hres;
 569
 570         *str = V_BSTR(&strv);
 571     }
 572
 573     return *str ? S_OK : E_OUTOFMEMORY;
 574 }
 575
 576 /* ECMA-262 3rd Edition    9.8 */
 577 HRESULT to_string(script_ctx_t *ctx, VARIANT *v, jsexcept_t *ei, BSTR *str)
 578 {
 579     const WCHAR undefinedW[] = {'u','n','d','e','f','i','n','e','d',0};
 580     const WCHAR nullW[] = {'n','u','l','l',0};
 581     const WCHAR trueW[] = {'t','r','u','e',0};
 582     const WCHAR falseW[] = {'f','a','l','s','e',0};
 583
 584     switch(V_VT(v)) {
 585     case VT_EMPTY:
 586         *str = SysAllocString(undefinedW);
 587         break;
 588     case VT_NULL:
 589         *str = SysAllocString(nullW);
 590         break;
 591     case VT_I4:
 592         *str = int_to_bstr(V_I4(v));
 593         break;
 594     case VT_R8:
 595         return double_to_bstr(V_R8(v), str);
 596     case VT_BSTR:
 597         *str = SysAllocString(V_BSTR(v));
 598         break;
 599     case VT_DISPATCH: {
 600         VARIANT prim;
 601         HRESULT hres;
 602
 603         hres = to_primitive(ctx, v, ei, &prim, HINT_STRING);
 604         if(FAILED(hres))
 605             return hres;
 606
 607         hres = to_string(ctx, &prim, ei, str);
 608         VariantClear(&prim);
 609         return hres;
 610     }
 611     case VT_BOOL:
 612         *str = SysAllocString(V_BOOL(v) ? trueW : falseW);
 613         break;
 614     default:
 615         FIXME("unsupported vt %d\n", V_VT(v));
 616         return E_NOTIMPL;
 617     }
 618
 619     return *str ? S_OK : E_OUTOFMEMORY;
 620 }
 621
 622 /* ECMA-262 3rd Edition    9.9 */
 623 HRESULT to_object(script_ctx_t *ctx, VARIANT *v, IDispatch **disp)
 624 {
 625     jsdisp_t *dispex;
 626     HRESULT hres;
 627
 628     switch(V_VT(v)) {
 629     case VT_BSTR:
 630         hres = create_string(ctx, V_BSTR(v), SysStringLen(V_BSTR(v)), &dispex);
 631         if(FAILED(hres))
 632             return hres;
 633
 634         *disp = to_disp(dispex);
 635         break;
 636     case VT_I4:
 637     case VT_R8:
 638         hres = create_number(ctx, num_val(v), &dispex);
 639         if(FAILED(hres))
 640             return hres;
 641
 642         *disp = to_disp(dispex);
 643         break;
 644     case VT_DISPATCH:
 645         if(V_DISPATCH(v)) {
 646             IDispatch_AddRef(V_DISPATCH(v));
 647             *disp = V_DISPATCH(v);
 648         }else {
 649             jsdisp_t *obj;
 650
 651             hres = create_object(ctx, NULL, &obj);
 652             if(FAILED(hres))
 653                 return hres;
 654
 655             *disp = to_disp(obj);
 656         }
 657         break;
 658     case VT_BOOL:
 659         hres = create_bool(ctx, V_BOOL(v), &dispex);
 660         if(FAILED(hres))
 661             return hres;
 662
 663         *disp = to_disp(dispex);
 664         break;
 665     case VT_ARRAY|VT_VARIANT:
 666         hres = create_vbarray(ctx, V_ARRAY(v), &dispex);
 667         if(FAILED(hres))
 668             return hres;
 669
 670         *disp = to_disp(dispex);
 671         break;
 672     default:
 673         FIXME("unsupported vt %d\n", V_VT(v));
 674         return E_NOTIMPL;
 675     }
 676
 677     return S_OK;
 678 }
 679
 680 HRESULT variant_change_type(script_ctx_t *ctx, VARIANT *dst, VARIANT *src, VARTYPE vt)
 681 {
 682     jsexcept_t ei;
 683     HRESULT hres;
 684
 685     memset(&ei, 0, sizeof(ei));
 686
 687     switch(vt) {
 688     case VT_I2:
 689     case VT_I4: {
 690         INT i;
 691
 692         hres = to_int32(ctx, src, &ei, &i);
 693         if(SUCCEEDED(hres)) {
 694             if(vt == VT_I4)
 695                 V_I4(dst) = i;
 696             else
 697                 V_I2(dst) = i;
 698         }
 699         break;
 700     }
 701     case VT_R8: {
 702         double n;
 703         hres = to_number(ctx, src, &ei, &n);
 704         if(SUCCEEDED(hres))
 705             V_R8(dst) = n;
 706         break;
 707     }
 708     case VT_R4: {
 709         double n;
 710
 711         hres = to_number(ctx, src, &ei, &n);
 712         if(SUCCEEDED(hres))
 713             V_R4(dst) = n;
 714         break;
 715     }
 716     case VT_BOOL: {
 717         VARIANT_BOOL b;
 718
 719         hres = to_boolean(src, &b);
 720         if(SUCCEEDED(hres))
 721             V_BOOL(dst) = b;
 722         break;
 723     }
 724     case VT_BSTR: {
 725         BSTR str;
 726
 727         hres = to_string(ctx, src, &ei, &str);
 728         if(SUCCEEDED(hres))
 729             V_BSTR(dst) = str;
 730         break;
 731     }
 732     case VT_EMPTY:
 733         hres = V_VT(src) == VT_EMPTY ? S_OK : E_NOTIMPL;
 734         break;
 735     case VT_NULL:
 736         hres = V_VT(src) == VT_NULL ? S_OK : E_NOTIMPL;
 737         break;
 738     default:
 739         FIXME("vt %d not implemented\n", vt);
 740         hres = E_NOTIMPL;
 741     }
 742
 743     if(FAILED(hres)) {
 744         VariantClear(&ei.var);
 745         return hres;
 746     }
 747
 748     V_VT(dst) = vt;
 749     return S_OK;
 750 }
 751
 752 static inline JSCaller *impl_from_IServiceProvider(IServiceProvider *iface)
 753 {
 754     return CONTAINING_RECORD(iface, JSCaller, IServiceProvider_iface);
 755 }
 756
 757 static HRESULT WINAPI JSCaller_QueryInterface(IServiceProvider *iface, REFIID riid, void **ppv)
 758 {
 759     JSCaller *This = impl_from_IServiceProvider(iface);
 760
 761     if(IsEqualGUID(&IID_IUnknown, riid)) {
 762         TRACE("(%p)->(IID_IUnknown %p)\n", This, ppv);
 763         *ppv = &This->IServiceProvider_iface;
 764     }else if(IsEqualGUID(&IID_IServiceProvider, riid)) {
 765         TRACE("(%p)->(IID_IServiceProvider %p)\n", This, ppv);
 766         *ppv = &This->IServiceProvider_iface;
 767     }else {
 768         WARN("(%p)->(%s %p)\n", This, debugstr_guid(riid), ppv);
 769         *ppv = NULL;
 770         return E_NOINTERFACE;
 771     }
 772
 773     IUnknown_AddRef((IUnknown*)*ppv);
 774     return S_OK;
 775 }
 776
 777 static ULONG WINAPI JSCaller_AddRef(IServiceProvider *iface)
 778 {
 779     JSCaller *This = impl_from_IServiceProvider(iface);
 780     LONG ref = InterlockedIncrement(&This->ref);
 781
 782     TRACE("(%p) ref=%d\n", This, ref);
 783
 784     return ref;
 785 }
 786
 787 static ULONG WINAPI JSCaller_Release(IServiceProvider *iface)
 788 {
 789     JSCaller *This = impl_from_IServiceProvider(iface);
 790     LONG ref = InterlockedIncrement(&This->ref);
 791
 792     TRACE("(%p) ref=%d\n", This, ref);
 793
 794     if(!ref) {
 795         assert(!This->ctx);
 796         heap_free(This);
 797     }
 798
 799     return ref;
 800 }
 801
 802 static HRESULT WINAPI JSCaller_QueryService(IServiceProvider *iface, REFGUID guidService,
 803         REFIID riid, void **ppv)
 804 {
 805     JSCaller *This = impl_from_IServiceProvider(iface);
 806
 807     if(IsEqualGUID(guidService, &SID_VariantConversion) && This->ctx && This->ctx->active_script) {
 808         TRACE("(%p)->(SID_VariantConversion)\n", This);
 809         return IActiveScript_QueryInterface(This->ctx->active_script, riid, ppv);
 810     }
 811
 812     FIXME("(%p)->(%s %s %p)\n", This, debugstr_guid(guidService), debugstr_guid(riid), ppv);
 813
 814     *ppv = NULL;
 815     return E_NOINTERFACE;
 816 }
 817
 818 static const IServiceProviderVtbl ServiceProviderVtbl = {
 819     JSCaller_QueryInterface,
 820     JSCaller_AddRef,
 821     JSCaller_Release,
 822     JSCaller_QueryService
 823 };
 824
 825 HRESULT create_jscaller(script_ctx_t *ctx)
 826 {
 827     JSCaller *ret;
 828
 829     ret = heap_alloc(sizeof(*ret));
 830     if(!ret)
 831         return E_OUTOFMEMORY;
 832
 833     ret->IServiceProvider_iface.lpVtbl = &ServiceProviderVtbl;
 834     ret->ref = 1;
 835     ret->ctx = ctx;
 836
 837     ctx->jscaller = ret;
 838     return S_OK;
 839 }