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