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         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 = ret_nan();
 352         else
 353             *ret = neg ? -ret_inf() : ret_inf();
 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 = 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 = 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         assert(0);
 451     default:
 452         FIXME("unimplemented for vt %d\n", V_VT(v));
 453         return E_NOTIMPL;
 454     }
 455
 456     return S_OK;
 457 }
 458
 459 /* ECMA-262 3rd Edition    9.4 */
 460 HRESULT to_integer(script_ctx_t *ctx, VARIANT *v, jsexcept_t *ei, VARIANT *ret)
 461 {
 462     double n;
 463     HRESULT hres;
 464
 465     if(V_VT(v) == VT_I4) {
 466         *ret = *v;
 467         return S_OK;
 468     }
 469
 470     hres = to_number(ctx, v, ei, &n);
 471     if(FAILED(hres))
 472         return hres;
 473
 474     if(isnan(n)) {
 475         V_VT(ret) = VT_I4;
 476         V_I4(ret) = 0;
 477     }else {
 478         num_set_val(ret, n >= 0.0 ? floor(n) : -floor(-n));
 479     }
 480
 481     return S_OK;
 482 }
 483
 484 /* ECMA-262 3rd Edition    9.5 */
 485 HRESULT to_int32(script_ctx_t *ctx, VARIANT *v, jsexcept_t *ei, INT *ret)
 486 {
 487     double n;
 488     HRESULT hres;
 489
 490     if(V_VT(v) == VT_I4) {
 491         *ret = V_I4(v);
 492         return S_OK;
 493     }
 494
 495     hres = to_number(ctx, v, ei, &n);
 496     if(FAILED(hres))
 497         return hres;
 498
 499     *ret = isnan(n) || isinf(n) ? 0 : n;
 500     return S_OK;
 501 }
 502
 503 /* ECMA-262 3rd Edition    9.6 */
 504 HRESULT to_uint32(script_ctx_t *ctx, VARIANT *v, jsexcept_t *ei, DWORD *ret)
 505 {
 506     double n;
 507     HRESULT hres;
 508
 509     if(V_VT(v) == VT_I4) {
 510         *ret = V_I4(v);
 511         return S_OK;
 512     }
 513
 514     hres = to_number(ctx, v, ei, &n);
 515     if(FAILED(hres))
 516         return hres;
 517
 518     *ret = isnan(n) || isinf(n) ? 0 : n;
 519     return S_OK;
 520 }
 521
 522 BSTR int_to_bstr(int i)
 523 {
 524     WCHAR buf[12], *p;
 525     BOOL neg = FALSE;
 526
 527     if(!i) {
 528         static const WCHAR zeroW[] = {'0',0};
 529         return SysAllocString(zeroW);
 530     }
 531
 532     if(i < 0) {
 533         neg = TRUE;
 534         i = -i;
 535     }
 536
 537     p = buf + sizeof(buf)/sizeof(*buf)-1;
 538     *p-- = 0;
 539     while(i) {
 540         *p-- = i%10 + '0';
 541         i /= 10;
 542     }
 543
 544     if(neg)
 545         *p = '-';
 546     else
 547         p++;
 548
 549     return SysAllocString(p);
 550 }
 551
 552 HRESULT double_to_bstr(double n, BSTR *str)
 553 {
 554     const WCHAR NaNW[] = {'N','a','N',0};
 555     const WCHAR InfinityW[] = {'-','I','n','f','i','n','i','t','y',0};
 556
 557     if(isnan(n)) {
 558        *str = SysAllocString(NaNW);
 559     }else if(isinf(n)) {
 560         *str = SysAllocString(n<0 ? InfinityW : InfinityW+1);
 561     }else {
 562         VARIANT strv, v;
 563         HRESULT hres;
 564
 565         V_VT(&v) = VT_R8;
 566         V_R8(&v) = n;
 567         V_VT(&strv) = VT_EMPTY;
 568         hres = VariantChangeTypeEx(&strv, &v, MAKELCID(MAKELANGID(LANG_ENGLISH,SUBLANG_ENGLISH_US),SORT_DEFAULT), 0, VT_BSTR);
 569         if(FAILED(hres))
 570             return hres;
 571
 572         *str = V_BSTR(&strv);
 573     }
 574
 575     return *str ? S_OK : E_OUTOFMEMORY;
 576 }
 577
 578 /* ECMA-262 3rd Edition    9.8 */
 579 HRESULT to_string(script_ctx_t *ctx, VARIANT *v, jsexcept_t *ei, BSTR *str)
 580 {
 581     const WCHAR undefinedW[] = {'u','n','d','e','f','i','n','e','d',0};
 582     const WCHAR nullW[] = {'n','u','l','l',0};
 583     const WCHAR trueW[] = {'t','r','u','e',0};
 584     const WCHAR falseW[] = {'f','a','l','s','e',0};
 585
 586     switch(V_VT(v)) {
 587     case VT_EMPTY:
 588         *str = SysAllocString(undefinedW);
 589         break;
 590     case VT_NULL:
 591         *str = SysAllocString(nullW);
 592         break;
 593     case VT_I4:
 594         *str = int_to_bstr(V_I4(v));
 595         break;
 596     case VT_R8:
 597         return double_to_bstr(V_R8(v), str);
 598     case VT_BSTR:
 599         *str = SysAllocString(V_BSTR(v));
 600         break;
 601     case VT_DISPATCH: {
 602         VARIANT prim;
 603         HRESULT hres;
 604
 605         hres = to_primitive(ctx, v, ei, &prim, HINT_STRING);
 606         if(FAILED(hres))
 607             return hres;
 608
 609         hres = to_string(ctx, &prim, ei, str);
 610         VariantClear(&prim);
 611         return hres;
 612     }
 613     case VT_BOOL:
 614         *str = SysAllocString(V_BOOL(v) ? trueW : falseW);
 615         break;
 616     default:
 617         FIXME("unsupported vt %d\n", V_VT(v));
 618         return E_NOTIMPL;
 619     }
 620
 621     return *str ? S_OK : E_OUTOFMEMORY;
 622 }
 623
 624 /* ECMA-262 3rd Edition    9.9 */
 625 HRESULT to_object(script_ctx_t *ctx, VARIANT *v, IDispatch **disp)
 626 {
 627     jsdisp_t *dispex;
 628     HRESULT hres;
 629
 630     switch(V_VT(v)) {
 631     case VT_BSTR:
 632         hres = create_string(ctx, V_BSTR(v), SysStringLen(V_BSTR(v)), &dispex);
 633         if(FAILED(hres))
 634             return hres;
 635
 636         *disp = to_disp(dispex);
 637         break;
 638     case VT_I4:
 639     case VT_R8:
 640         hres = create_number(ctx, num_val(v), &dispex);
 641         if(FAILED(hres))
 642             return hres;
 643
 644         *disp = to_disp(dispex);
 645         break;
 646     case VT_DISPATCH:
 647         if(V_DISPATCH(v)) {
 648             IDispatch_AddRef(V_DISPATCH(v));
 649             *disp = V_DISPATCH(v);
 650         }else {
 651             jsdisp_t *obj;
 652
 653             hres = create_object(ctx, NULL, &obj);
 654             if(FAILED(hres))
 655                 return hres;
 656
 657             *disp = to_disp(obj);
 658         }
 659         break;
 660     case VT_BOOL:
 661         hres = create_bool(ctx, V_BOOL(v), &dispex);
 662         if(FAILED(hres))
 663             return hres;
 664
 665         *disp = to_disp(dispex);
 666         break;
 667     case VT_ARRAY|VT_VARIANT:
 668         hres = create_vbarray(ctx, V_ARRAY(v), &dispex);
 669         if(FAILED(hres))
 670             return hres;
 671
 672         *disp = to_disp(dispex);
 673         break;
 674     default:
 675         FIXME("unsupported vt %d\n", V_VT(v));
 676         return E_NOTIMPL;
 677     }
 678
 679     return S_OK;
 680 }
 681
 682 HRESULT variant_change_type(script_ctx_t *ctx, VARIANT *dst, VARIANT *src, VARTYPE vt)
 683 {
 684     jsexcept_t ei;
 685     HRESULT hres;
 686
 687     memset(&ei, 0, sizeof(ei));
 688
 689     switch(vt) {
 690     case VT_I2:
 691     case VT_I4: {
 692         INT i;
 693
 694         hres = to_int32(ctx, src, &ei, &i);
 695         if(SUCCEEDED(hres)) {
 696             if(vt == VT_I4)
 697                 V_I4(dst) = i;
 698             else
 699                 V_I2(dst) = i;
 700         }
 701         break;
 702     }
 703     case VT_R8: {
 704         double n;
 705         hres = to_number(ctx, src, &ei, &n);
 706         if(SUCCEEDED(hres))
 707             V_R8(dst) = n;
 708         break;
 709     }
 710     case VT_R4: {
 711         double n;
 712
 713         hres = to_number(ctx, src, &ei, &n);
 714         if(SUCCEEDED(hres))
 715             V_R4(dst) = n;
 716         break;
 717     }
 718     case VT_BOOL: {
 719         VARIANT_BOOL b;
 720
 721         hres = to_boolean(src, &b);
 722         if(SUCCEEDED(hres))
 723             V_BOOL(dst) = b;
 724         break;
 725     }
 726     case VT_BSTR: {
 727         BSTR str;
 728
 729         hres = to_string(ctx, src, &ei, &str);
 730         if(SUCCEEDED(hres))
 731             V_BSTR(dst) = str;
 732         break;
 733     }
 734     case VT_EMPTY:
 735         hres = V_VT(src) == VT_EMPTY ? S_OK : E_NOTIMPL;
 736         break;
 737     case VT_NULL:
 738         hres = V_VT(src) == VT_NULL ? S_OK : E_NOTIMPL;
 739         break;
 740     default:
 741         FIXME("vt %d not implemented\n", vt);
 742         hres = E_NOTIMPL;
 743     }
 744
 745     if(FAILED(hres)) {
 746         VariantClear(&ei.var);
 747         return hres;
 748     }
 749
 750     V_VT(dst) = vt;
 751     return S_OK;
 752 }
 753
 754 static inline JSCaller *impl_from_IServiceProvider(IServiceProvider *iface)
 755 {
 756     return CONTAINING_RECORD(iface, JSCaller, IServiceProvider_iface);
 757 }
 758
 759 static HRESULT WINAPI JSCaller_QueryInterface(IServiceProvider *iface, REFIID riid, void **ppv)
 760 {
 761     JSCaller *This = impl_from_IServiceProvider(iface);
 762
 763     if(IsEqualGUID(&IID_IUnknown, riid)) {
 764         TRACE("(%p)->(IID_IUnknown %p)\n", This, ppv);
 765         *ppv = &This->IServiceProvider_iface;
 766     }else if(IsEqualGUID(&IID_IServiceProvider, riid)) {
 767         TRACE("(%p)->(IID_IServiceProvider %p)\n", This, ppv);
 768         *ppv = &This->IServiceProvider_iface;
 769     }else {
 770         WARN("(%p)->(%s %p)\n", This, debugstr_guid(riid), ppv);
 771         *ppv = NULL;
 772         return E_NOINTERFACE;
 773     }
 774
 775     IUnknown_AddRef((IUnknown*)*ppv);
 776     return S_OK;
 777 }
 778
 779 static ULONG WINAPI JSCaller_AddRef(IServiceProvider *iface)
 780 {
 781     JSCaller *This = impl_from_IServiceProvider(iface);
 782     LONG ref = InterlockedIncrement(&This->ref);
 783
 784     TRACE("(%p) ref=%d\n", This, ref);
 785
 786     return ref;
 787 }
 788
 789 static ULONG WINAPI JSCaller_Release(IServiceProvider *iface)
 790 {
 791     JSCaller *This = impl_from_IServiceProvider(iface);
 792     LONG ref = InterlockedIncrement(&This->ref);
 793
 794     TRACE("(%p) ref=%d\n", This, ref);
 795
 796     if(!ref) {
 797         assert(!This->ctx);
 798         heap_free(This);
 799     }
 800
 801     return ref;
 802 }
 803
 804 static HRESULT WINAPI JSCaller_QueryService(IServiceProvider *iface, REFGUID guidService,
 805         REFIID riid, void **ppv)
 806 {
 807     JSCaller *This = impl_from_IServiceProvider(iface);
 808
 809     if(IsEqualGUID(guidService, &SID_VariantConversion) && This->ctx && This->ctx->active_script) {
 810         TRACE("(%p)->(SID_VariantConversion)\n", This);
 811         return IActiveScript_QueryInterface(This->ctx->active_script, riid, ppv);
 812     }
 813
 814     FIXME("(%p)->(%s %s %p)\n", This, debugstr_guid(guidService), debugstr_guid(riid), ppv);
 815
 816     *ppv = NULL;
 817     return E_NOINTERFACE;
 818 }
 819
 820 static const IServiceProviderVtbl ServiceProviderVtbl = {
 821     JSCaller_QueryInterface,
 822     JSCaller_AddRef,
 823     JSCaller_Release,
 824     JSCaller_QueryService
 825 };
 826
 827 HRESULT create_jscaller(script_ctx_t *ctx)
 828 {
 829     JSCaller *ret;
 830
 831     ret = heap_alloc(sizeof(*ret));
 832     if(!ret)
 833         return E_OUTOFMEMORY;
 834
 835     ret->IServiceProvider_iface.lpVtbl = &ServiceProviderVtbl;
 836     ret->ref = 1;
 837     ret->ctx = ctx;
 838
 839     ctx->jscaller = ret;
 840     return S_OK;
 841 }