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