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         DISPPARAMS dp = {NULL, NULL, 0, 0};
 207         HRESULT hres;
 208
 209         static const WCHAR toStringW[] = {'t','o','S','t','r','i','n','g',0};
 210         static const WCHAR valueOfW[] = {'v','a','l','u','e','O','f',0};
 211
 212         if(!V_DISPATCH(v)) {
 213             V_VT(ret) = VT_NULL;
 214             break;
 215         }
 216
 217         jsdisp = iface_to_jsdisp((IUnknown*)V_DISPATCH(v));
 218         if(!jsdisp) {
 219             V_VT(ret) = VT_EMPTY;
 220             return disp_propget(ctx, V_DISPATCH(v), DISPID_VALUE, ret, ei);
 221         }
 222
 223         if(hint == NO_HINT)
 224             hint = is_class(jsdisp, JSCLASS_DATE) ? HINT_STRING : HINT_NUMBER;
 225
 226         /* Native implementation doesn't throw TypeErrors, returns strange values */
 227
 228         hres = jsdisp_get_id(jsdisp, hint == HINT_STRING ? toStringW : valueOfW, 0, &id);
 229         if(SUCCEEDED(hres)) {
 230             hres = jsdisp_call(jsdisp, id, DISPATCH_METHOD, &dp, ret, ei);
 231             if(FAILED(hres)) {
 232                 WARN("call error - forwarding exception\n");
 233                 jsdisp_release(jsdisp);
 234                 return hres;
 235             }
 236             else if(V_VT(ret) != VT_DISPATCH) {
 237                 jsdisp_release(jsdisp);
 238                 return S_OK;
 239             }
 240             else
 241                 IDispatch_Release(V_DISPATCH(ret));
 242         }
 243
 244         hres = jsdisp_get_id(jsdisp, hint == HINT_STRING ? valueOfW : toStringW, 0, &id);
 245         if(SUCCEEDED(hres)) {
 246             hres = jsdisp_call(jsdisp, id, DISPATCH_METHOD, &dp, ret, ei);
 247             if(FAILED(hres)) {
 248                 WARN("call error - forwarding exception\n");
 249                 jsdisp_release(jsdisp);
 250                 return hres;
 251             }
 252             else if(V_VT(ret) != VT_DISPATCH) {
 253                 jsdisp_release(jsdisp);
 254                 return S_OK;
 255             }
 256             else
 257                 IDispatch_Release(V_DISPATCH(ret));
 258         }
 259
 260         jsdisp_release(jsdisp);
 261
 262         WARN("failed\n");
 263         return throw_type_error(ctx, ei, JS_E_TO_PRIMITIVE, NULL);
 264     }
 265     case VT_I2:
 266     case VT_INT:
 267         assert(0);
 268     default:
 269         FIXME("Unimplemented for vt %d\n", V_VT(v));
 270         return E_NOTIMPL;
 271     }
 272
 273     return S_OK;
 274 }
 275
 276 /* ECMA-262 3rd Edition    9.2 */
 277 HRESULT to_boolean(VARIANT *v, VARIANT_BOOL *b)
 278 {
 279     switch(V_VT(v)) {
 280     case VT_EMPTY:
 281     case VT_NULL:
 282         *b = VARIANT_FALSE;
 283         break;
 284     case VT_I4:
 285         *b = V_I4(v) ? VARIANT_TRUE : VARIANT_FALSE;
 286         break;
 287     case VT_R8:
 288         if(isnan(V_R8(v))) *b = VARIANT_FALSE;
 289         else *b = V_R8(v) ? VARIANT_TRUE : VARIANT_FALSE;
 290         break;
 291     case VT_BSTR:
 292         *b = V_BSTR(v) && *V_BSTR(v) ? VARIANT_TRUE : VARIANT_FALSE;
 293         break;
 294     case VT_DISPATCH:
 295         *b = V_DISPATCH(v) ? VARIANT_TRUE : VARIANT_FALSE;
 296         break;
 297     case VT_BOOL:
 298         *b = V_BOOL(v);
 299         break;
 300     default:
 301         FIXME("unimplemented for vt %d\n", V_VT(v));
 302         return E_NOTIMPL;
 303     }
 304
 305     return S_OK;
 306 }
 307
 308 static int hex_to_int(WCHAR c)
 309 {
 310     if('0' <= c && c <= '9')
 311         return c-'0';
 312
 313     if('a' <= c && c <= 'f')
 314         return c-'a'+10;
 315
 316     if('A' <= c && c <= 'F')
 317         return c-'A'+10;
 318
 319     return -1;
 320 }
 321
 322 /* ECMA-262 3rd Edition    9.3.1 */
 323 static HRESULT str_to_number(BSTR str, double *ret)
 324 {
 325     const WCHAR *ptr = str;
 326     BOOL neg = FALSE;
 327     DOUBLE d = 0.0;
 328
 329     static const WCHAR infinityW[] = {'I','n','f','i','n','i','t','y'};
 330
 331     if(!ptr) {
 332         *ret = 0;
 333         return S_OK;
 334     }
 335
 336     while(isspaceW(*ptr))
 337         ptr++;
 338
 339     if(*ptr == '-') {
 340         neg = TRUE;
 341         ptr++;
 342     }else if(*ptr == '+') {
 343         ptr++;
 344     }
 345
 346     if(!strncmpW(ptr, infinityW, sizeof(infinityW)/sizeof(WCHAR))) {
 347         ptr += sizeof(infinityW)/sizeof(WCHAR);
 348         while(*ptr && isspaceW(*ptr))
 349             ptr++;
 350
 351         if(*ptr)
 352             *ret = NAN;
 353         else
 354             *ret = neg ? -INFINITY : INFINITY;
 355         return S_OK;
 356     }
 357
 358     if(*ptr == '0' && ptr[1] == 'x') {
 359         DWORD l = 0;
 360
 361         ptr += 2;
 362         while((l = hex_to_int(*ptr)) != -1) {
 363             d = d*16 + l;
 364             ptr++;
 365         }
 366
 367         *ret = d;
 368         return S_OK;
 369     }
 370
 371     while(isdigitW(*ptr))
 372         d = d*10 + (*ptr++ - '0');
 373
 374     if(*ptr == 'e' || *ptr == 'E') {
 375         BOOL eneg = FALSE;
 376         LONG l = 0;
 377
 378         ptr++;
 379         if(*ptr == '-') {
 380             ptr++;
 381             eneg = TRUE;
 382         }else if(*ptr == '+') {
 383             ptr++;
 384         }
 385
 386         while(isdigitW(*ptr))
 387             l = l*10 + (*ptr++ - '0');
 388         if(eneg)
 389             l = -l;
 390
 391         d *= pow(10, l);
 392     }else if(*ptr == '.') {
 393         DOUBLE dec = 0.1;
 394
 395         ptr++;
 396         while(isdigitW(*ptr)) {
 397             d += dec * (*ptr++ - '0');
 398             dec *= 0.1;
 399         }
 400     }
 401
 402     while(isspaceW(*ptr))
 403         ptr++;
 404
 405     if(*ptr) {
 406         *ret = NAN;
 407         return S_OK;
 408     }
 409
 410     if(neg)
 411         d = -d;
 412
 413     *ret = d;
 414     return S_OK;
 415 }
 416
 417 /* ECMA-262 3rd Edition    9.3 */
 418 HRESULT to_number(script_ctx_t *ctx, VARIANT *v, jsexcept_t *ei, double *ret)
 419 {
 420     switch(V_VT(v)) {
 421     case VT_EMPTY:
 422         *ret = NAN;
 423         break;
 424     case VT_NULL:
 425         *ret = 0;
 426         break;
 427     case VT_I4:
 428         *ret = V_I4(v);
 429         break;
 430     case VT_R8:
 431         *ret = V_R8(v);
 432         break;
 433     case VT_BSTR:
 434         return str_to_number(V_BSTR(v), ret);
 435     case VT_DISPATCH: {
 436         VARIANT prim;
 437         HRESULT hres;
 438
 439         hres = to_primitive(ctx, v, ei, &prim, HINT_NUMBER);
 440         if(FAILED(hres))
 441             return hres;
 442
 443         hres = to_number(ctx, &prim, ei, ret);
 444         VariantClear(&prim);
 445         return hres;
 446     }
 447     case VT_BOOL:
 448         *ret = V_BOOL(v) ? 1 : 0;
 449         break;
 450     case VT_I2:
 451     case VT_INT:
 452         assert(0);
 453     default:
 454         FIXME("unimplemented for vt %d\n", V_VT(v));
 455         return E_NOTIMPL;
 456     }
 457
 458     return S_OK;
 459 }
 460
 461 /* ECMA-262 3rd Edition    9.4 */
 462 HRESULT to_integer(script_ctx_t *ctx, VARIANT *v, jsexcept_t *ei, double *ret)
 463 {
 464     double n;
 465     HRESULT hres;
 466
 467     if(V_VT(v) == VT_I4) {
 468         *ret = V_I4(v);
 469         return S_OK;
 470     }
 471
 472     hres = to_number(ctx, v, ei, &n);
 473     if(FAILED(hres))
 474         return hres;
 475
 476     if(isnan(n))
 477         *ret = 0;
 478     else
 479         *ret = n >= 0.0 ? floor(n) : -floor(-n);
 480     return S_OK;
 481 }
 482
 483 /* ECMA-262 3rd Edition    9.5 */
 484 HRESULT to_int32(script_ctx_t *ctx, VARIANT *v, jsexcept_t *ei, INT *ret)
 485 {
 486     double n;
 487     HRESULT hres;
 488
 489     if(V_VT(v) == VT_I4) {
 490         *ret = V_I4(v);
 491         return S_OK;
 492     }
 493
 494     hres = to_number(ctx, v, ei, &n);
 495     if(FAILED(hres))
 496         return hres;
 497
 498     *ret = isnan(n) || isinf(n) ? 0 : n;
 499     return S_OK;
 500 }
 501
 502 /* ECMA-262 3rd Edition    9.6 */
 503 HRESULT to_uint32(script_ctx_t *ctx, VARIANT *v, jsexcept_t *ei, DWORD *ret)
 504 {
 505     double n;
 506     HRESULT hres;
 507
 508     if(V_VT(v) == VT_I4) {
 509         *ret = V_I4(v);
 510         return S_OK;
 511     }
 512
 513     hres = to_number(ctx, v, ei, &n);
 514     if(FAILED(hres))
 515         return hres;
 516
 517     *ret = isnan(n) || isinf(n) ? 0 : n;
 518     return S_OK;
 519 }
 520
 521 BSTR int_to_bstr(int i)
 522 {
 523     WCHAR buf[12], *p;
 524     BOOL neg = FALSE;
 525
 526     if(!i) {
 527         static const WCHAR zeroW[] = {'0',0};
 528         return SysAllocString(zeroW);
 529     }
 530
 531     if(i < 0) {
 532         neg = TRUE;
 533         i = -i;
 534     }
 535
 536     p = buf + sizeof(buf)/sizeof(*buf)-1;
 537     *p-- = 0;
 538     while(i) {
 539         *p-- = i%10 + '0';
 540         i /= 10;
 541     }
 542
 543     if(neg)
 544         *p = '-';
 545     else
 546         p++;
 547
 548     return SysAllocString(p);
 549 }
 550
 551 HRESULT double_to_bstr(double n, BSTR *str)
 552 {
 553     const WCHAR NaNW[] = {'N','a','N',0};
 554     const WCHAR InfinityW[] = {'-','I','n','f','i','n','i','t','y',0};
 555
 556     if(isnan(n)) {
 557        *str = SysAllocString(NaNW);
 558     }else if(isinf(n)) {
 559         *str = SysAllocString(n<0 ? InfinityW : InfinityW+1);
 560     }else {
 561         VARIANT strv, v;
 562         HRESULT hres;
 563
 564         V_VT(&v) = VT_R8;
 565         V_R8(&v) = n;
 566         V_VT(&strv) = VT_EMPTY;
 567         hres = VariantChangeTypeEx(&strv, &v, MAKELCID(MAKELANGID(LANG_ENGLISH,SUBLANG_ENGLISH_US),SORT_DEFAULT), 0, VT_BSTR);
 568         if(FAILED(hres))
 569             return hres;
 570
 571         *str = V_BSTR(&strv);
 572     }
 573
 574     return *str ? S_OK : E_OUTOFMEMORY;
 575 }
 576
 577 /* ECMA-262 3rd Edition    9.8 */
 578 HRESULT to_string(script_ctx_t *ctx, VARIANT *v, jsexcept_t *ei, BSTR *str)
 579 {
 580     const WCHAR undefinedW[] = {'u','n','d','e','f','i','n','e','d',0};
 581     const WCHAR nullW[] = {'n','u','l','l',0};
 582     const WCHAR trueW[] = {'t','r','u','e',0};
 583     const WCHAR falseW[] = {'f','a','l','s','e',0};
 584
 585     switch(V_VT(v)) {
 586     case VT_EMPTY:
 587         *str = SysAllocString(undefinedW);
 588         break;
 589     case VT_NULL:
 590         *str = SysAllocString(nullW);
 591         break;
 592     case VT_I4:
 593         *str = int_to_bstr(V_I4(v));
 594         break;
 595     case VT_R8:
 596         return double_to_bstr(V_R8(v), str);
 597     case VT_BSTR:
 598         *str = SysAllocString(V_BSTR(v));
 599         break;
 600     case VT_DISPATCH: {
 601         VARIANT prim;
 602         HRESULT hres;
 603
 604         hres = to_primitive(ctx, v, ei, &prim, HINT_STRING);
 605         if(FAILED(hres))
 606             return hres;
 607
 608         hres = to_string(ctx, &prim, ei, str);
 609         VariantClear(&prim);
 610         return hres;
 611     }
 612     case VT_BOOL:
 613         *str = SysAllocString(V_BOOL(v) ? trueW : falseW);
 614         break;
 615     default:
 616         FIXME("unsupported vt %d\n", V_VT(v));
 617         return E_NOTIMPL;
 618     }
 619
 620     return *str ? S_OK : E_OUTOFMEMORY;
 621 }
 622
 623 /* ECMA-262 3rd Edition    9.9 */
 624 HRESULT to_object(script_ctx_t *ctx, VARIANT *v, IDispatch **disp)
 625 {
 626     jsdisp_t *dispex;
 627     HRESULT hres;
 628
 629     switch(V_VT(v)) {
 630     case VT_BSTR:
 631         hres = create_string(ctx, V_BSTR(v), SysStringLen(V_BSTR(v)), &dispex);
 632         if(FAILED(hres))
 633             return hres;
 634
 635         *disp = to_disp(dispex);
 636         break;
 637     case VT_I4:
 638     case VT_R8:
 639         hres = create_number(ctx, num_val(v), &dispex);
 640         if(FAILED(hres))
 641             return hres;
 642
 643         *disp = to_disp(dispex);
 644         break;
 645     case VT_DISPATCH:
 646         if(V_DISPATCH(v)) {
 647             IDispatch_AddRef(V_DISPATCH(v));
 648             *disp = V_DISPATCH(v);
 649         }else {
 650             jsdisp_t *obj;
 651
 652             hres = create_object(ctx, NULL, &obj);
 653             if(FAILED(hres))
 654                 return hres;
 655
 656             *disp = to_disp(obj);
 657         }
 658         break;
 659     case VT_BOOL:
 660         hres = create_bool(ctx, V_BOOL(v), &dispex);
 661         if(FAILED(hres))
 662             return hres;
 663
 664         *disp = to_disp(dispex);
 665         break;
 666     case VT_ARRAY|VT_VARIANT:
 667         hres = create_vbarray(ctx, V_ARRAY(v), &dispex);
 668         if(FAILED(hres))
 669             return hres;
 670
 671         *disp = to_disp(dispex);
 672         break;
 673     default:
 674         FIXME("unsupported vt %d\n", V_VT(v));
 675         return E_NOTIMPL;
 676     }
 677
 678     return S_OK;
 679 }
 680
 681 HRESULT variant_change_type(script_ctx_t *ctx, VARIANT *dst, VARIANT *src, VARTYPE vt)
 682 {
 683     jsexcept_t ei;
 684     HRESULT hres;
 685
 686     memset(&ei, 0, sizeof(ei));
 687
 688     switch(vt) {
 689     case VT_I2:
 690     case VT_I4: {
 691         INT i;
 692
 693         hres = to_int32(ctx, src, &ei, &i);
 694         if(SUCCEEDED(hres)) {
 695             if(vt == VT_I4)
 696                 V_I4(dst) = i;
 697             else
 698                 V_I2(dst) = i;
 699         }
 700         break;
 701     }
 702     case VT_R8: {
 703         double n;
 704         hres = to_number(ctx, src, &ei, &n);
 705         if(SUCCEEDED(hres))
 706             V_R8(dst) = n;
 707         break;
 708     }
 709     case VT_R4: {
 710         double n;
 711
 712         hres = to_number(ctx, src, &ei, &n);
 713         if(SUCCEEDED(hres))
 714             V_R4(dst) = n;
 715         break;
 716     }
 717     case VT_BOOL: {
 718         VARIANT_BOOL b;
 719
 720         hres = to_boolean(src, &b);
 721         if(SUCCEEDED(hres))
 722             V_BOOL(dst) = b;
 723         break;
 724     }
 725     case VT_BSTR: {
 726         BSTR str;
 727
 728         hres = to_string(ctx, src, &ei, &str);
 729         if(SUCCEEDED(hres))
 730             V_BSTR(dst) = str;
 731         break;
 732     }
 733     case VT_EMPTY:
 734         hres = V_VT(src) == VT_EMPTY ? S_OK : E_NOTIMPL;
 735         break;
 736     case VT_NULL:
 737         hres = V_VT(src) == VT_NULL ? S_OK : E_NOTIMPL;
 738         break;
 739     default:
 740         FIXME("vt %d not implemented\n", vt);
 741         hres = E_NOTIMPL;
 742     }
 743
 744     if(FAILED(hres)) {
 745         VariantClear(&ei.var);
 746         return hres;
 747     }
 748
 749     V_VT(dst) = vt;
 750     return S_OK;
 751 }
 752
 753 static inline JSCaller *impl_from_IServiceProvider(IServiceProvider *iface)
 754 {
 755     return CONTAINING_RECORD(iface, JSCaller, IServiceProvider_iface);
 756 }
 757
 758 static HRESULT WINAPI JSCaller_QueryInterface(IServiceProvider *iface, REFIID riid, void **ppv)
 759 {
 760     JSCaller *This = impl_from_IServiceProvider(iface);
 761
 762     if(IsEqualGUID(&IID_IUnknown, riid)) {
 763         TRACE("(%p)->(IID_IUnknown %p)\n", This, ppv);
 764         *ppv = &This->IServiceProvider_iface;
 765     }else if(IsEqualGUID(&IID_IServiceProvider, riid)) {
 766         TRACE("(%p)->(IID_IServiceProvider %p)\n", This, ppv);
 767         *ppv = &This->IServiceProvider_iface;
 768     }else {
 769         WARN("(%p)->(%s %p)\n", This, debugstr_guid(riid), ppv);
 770         *ppv = NULL;
 771         return E_NOINTERFACE;
 772     }
 773
 774     IUnknown_AddRef((IUnknown*)*ppv);
 775     return S_OK;
 776 }
 777
 778 static ULONG WINAPI JSCaller_AddRef(IServiceProvider *iface)
 779 {
 780     JSCaller *This = impl_from_IServiceProvider(iface);
 781     LONG ref = InterlockedIncrement(&This->ref);
 782
 783     TRACE("(%p) ref=%d\n", This, ref);
 784
 785     return ref;
 786 }
 787
 788 static ULONG WINAPI JSCaller_Release(IServiceProvider *iface)
 789 {
 790     JSCaller *This = impl_from_IServiceProvider(iface);
 791     LONG ref = InterlockedIncrement(&This->ref);
 792
 793     TRACE("(%p) ref=%d\n", This, ref);
 794
 795     if(!ref) {
 796         assert(!This->ctx);
 797         heap_free(This);
 798     }
 799
 800     return ref;
 801 }
 802
 803 static HRESULT WINAPI JSCaller_QueryService(IServiceProvider *iface, REFGUID guidService,
 804         REFIID riid, void **ppv)
 805 {
 806     JSCaller *This = impl_from_IServiceProvider(iface);
 807
 808     if(IsEqualGUID(guidService, &SID_VariantConversion) && This->ctx && This->ctx->active_script) {
 809         TRACE("(%p)->(SID_VariantConversion)\n", This);
 810         return IActiveScript_QueryInterface(This->ctx->active_script, riid, ppv);
 811     }
 812
 813     FIXME("(%p)->(%s %s %p)\n", This, debugstr_guid(guidService), debugstr_guid(riid), ppv);
 814
 815     *ppv = NULL;
 816     return E_NOINTERFACE;
 817 }
 818
 819 static const IServiceProviderVtbl ServiceProviderVtbl = {
 820     JSCaller_QueryInterface,
 821     JSCaller_AddRef,
 822     JSCaller_Release,
 823     JSCaller_QueryService
 824 };
 825
 826 HRESULT create_jscaller(script_ctx_t *ctx)
 827 {
 828     JSCaller *ret;
 829
 830     ret = heap_alloc(sizeof(*ret));
 831     if(!ret)
 832         return E_OUTOFMEMORY;
 833
 834     ret->IServiceProvider_iface.lpVtbl = &ServiceProviderVtbl;
 835     ret->ref = 1;
 836     ret->ctx = ctx;
 837
 838     ctx->jscaller = ret;
 839     return S_OK;
 840 }