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
  20 #include <math.h>
  21 #include <assert.h>
  22
  23 #include "jscript.h"
  24 #include "engine.h"
  25
  26 #include "wine/debug.h"
  27
  28 WINE_DEFAULT_DEBUG_CHANNEL(jscript);
  29 WINE_DECLARE_DEBUG_CHANNEL(heap);
  30
  31 const char *debugstr_jsval(const jsval_t v)
  32 {
  33     switch(jsval_type(v)) {
  34     case JSV_UNDEFINED:
  35         return "undefined";
  36     case JSV_NULL:
  37         return "null";
  38     case JSV_OBJECT:
  39         return wine_dbg_sprintf("obj(%p)", get_object(v));
  40     case JSV_STRING:
  41         return wine_dbg_sprintf("str(%s)", debugstr_jsstr(get_string(v)));
  42     case JSV_NUMBER:
  43         return wine_dbg_sprintf("%lf", get_number(v));
  44     case JSV_BOOL:
  45         return get_bool(v) ? "true" : "false";
  46     case JSV_VARIANT:
  47         return debugstr_variant(get_variant(v));
  48     }
  49
  50     assert(0);
  51     return NULL;
  52 }
  53
  54 BOOL is_finite(double n)
  55 {
  56     return !isnan(n) && !isinf(n);
  57 }
  58
  59 #define MIN_BLOCK_SIZE  128
  60 #define ARENA_FREE_FILLER  0xaa
  61
  62 static inline DWORD block_size(DWORD block)
  63 {
  64     return MIN_BLOCK_SIZE << block;
  65 }
  66
  67 void heap_pool_init(heap_pool_t *heap)
  68 {
  69     memset(heap, 0, sizeof(*heap));
  70     list_init(&heap->custom_blocks);
  71 }
  72
  73 void *heap_pool_alloc(heap_pool_t *heap, DWORD size)
  74 {
  75     struct list *list;
  76     void *tmp;
  77
  78     if(!heap->block_cnt) {
  79         if(!heap->blocks) {
  80             heap->blocks = heap_alloc(sizeof(void*));
  81             if(!heap->blocks)
  82                 return NULL;
  83         }
  84
  85         tmp = heap_alloc(block_size(0));
  86         if(!tmp)
  87             return NULL;
  88
  89         heap->blocks[0] = tmp;
  90         heap->block_cnt = 1;
  91     }
  92
  93     if(heap->offset + size <= block_size(heap->last_block)) {
  94         tmp = ((BYTE*)heap->blocks[heap->last_block])+heap->offset;
  95         heap->offset += size;
  96         return tmp;
  97     }
  98
  99     if(size <= block_size(heap->last_block+1)) {
 100         if(heap->last_block+1 == heap->block_cnt) {
 101             tmp = heap_realloc(heap->blocks, (heap->block_cnt+1)*sizeof(void*));
 102             if(!tmp)
 103                 return NULL;
 104
 105             heap->blocks = tmp;
 106             heap->blocks[heap->block_cnt] = heap_alloc(block_size(heap->block_cnt));
 107             if(!heap->blocks[heap->block_cnt])
 108                 return NULL;
 109
 110             heap->block_cnt++;
 111         }
 112
 113         heap->last_block++;
 114         heap->offset = size;
 115         return heap->blocks[heap->last_block];
 116     }
 117
 118     list = heap_alloc(size + sizeof(struct list));
 119     if(!list)
 120         return NULL;
 121
 122     list_add_head(&heap->custom_blocks, list);
 123     return list+1;
 124 }
 125
 126 void *heap_pool_grow(heap_pool_t *heap, void *mem, DWORD size, DWORD inc)
 127 {
 128     void *ret;
 129
 130     if(mem == (BYTE*)heap->blocks[heap->last_block] + heap->offset-size
 131        && heap->offset+inc < block_size(heap->last_block)) {
 132         heap->offset += inc;
 133         return mem;
 134     }
 135
 136     ret = heap_pool_alloc(heap, size+inc);
 137     if(ret) /* FIXME: avoid copying for custom blocks */
 138         memcpy(ret, mem, size);
 139     return ret;
 140 }
 141
 142 void heap_pool_clear(heap_pool_t *heap)
 143 {
 144     struct list *tmp;
 145
 146     if(!heap)
 147         return;
 148
 149     while((tmp = list_head(&heap->custom_blocks))) {
 150         list_remove(tmp);
 151         heap_free(tmp);
 152     }
 153
 154     if(WARN_ON(heap)) {
 155         DWORD i;
 156
 157         for(i=0; i < heap->block_cnt; i++)
 158             memset(heap->blocks[i], ARENA_FREE_FILLER, block_size(i));
 159     }
 160
 161     heap->last_block = heap->offset = 0;
 162     heap->mark = FALSE;
 163 }
 164
 165 void heap_pool_free(heap_pool_t *heap)
 166 {
 167     DWORD i;
 168
 169     heap_pool_clear(heap);
 170
 171     for(i=0; i < heap->block_cnt; i++)
 172         heap_free(heap->blocks[i]);
 173     heap_free(heap->blocks);
 174
 175     heap_pool_init(heap);
 176 }
 177
 178 heap_pool_t *heap_pool_mark(heap_pool_t *heap)
 179 {
 180     if(heap->mark)
 181         return NULL;
 182
 183     heap->mark = TRUE;
 184     return heap;
 185 }
 186
 187 void jsval_release(jsval_t val)
 188 {
 189     switch(jsval_type(val)) {
 190     case JSV_OBJECT:
 191         if(get_object(val))
 192             IDispatch_Release(get_object(val));
 193         break;
 194     case JSV_STRING:
 195         jsstr_release(get_string(val));
 196         break;
 197     case JSV_VARIANT:
 198         VariantClear(get_variant(val));
 199         heap_free(get_variant(val));
 200         break;
 201     default:
 202         break;
 203     }
 204 }
 205
 206 static HRESULT jsval_variant(jsval_t *val, VARIANT *var)
 207 {
 208     VARIANT *v;
 209     HRESULT hres;
 210
 211     __JSVAL_TYPE(*val) = JSV_VARIANT;
 212     __JSVAL_VAR(*val) = v = heap_alloc(sizeof(VARIANT));
 213     if(!v) {
 214         *val = jsval_undefined();
 215         return E_OUTOFMEMORY;
 216     }
 217
 218     V_VT(v) = VT_EMPTY;
 219     hres = VariantCopy(v, var);
 220     if(FAILED(hres)) {
 221         *val = jsval_undefined();
 222         heap_free(v);
 223     }
 224     return hres;
 225 }
 226
 227 HRESULT jsval_copy(jsval_t v, jsval_t *r)
 228 {
 229     switch(jsval_type(v)) {
 230     case JSV_UNDEFINED:
 231     case JSV_NULL:
 232     case JSV_NUMBER:
 233     case JSV_BOOL:
 234         *r = v;
 235         return S_OK;
 236     case JSV_OBJECT:
 237         if(get_object(v))
 238             IDispatch_AddRef(get_object(v));
 239         *r = v;
 240         return S_OK;
 241     case JSV_STRING: {
 242         jsstr_addref(get_string(v));
 243         *r = v;
 244         return S_OK;
 245     }
 246     case JSV_VARIANT:
 247         return jsval_variant(r, get_variant(v));
 248     }
 249
 250     assert(0);
 251     return E_FAIL;
 252 }
 253
 254 HRESULT variant_to_jsval(VARIANT *var, jsval_t *r)
 255 {
 256     if(V_VT(var) == (VT_VARIANT|VT_BYREF))
 257         var = V_VARIANTREF(var);
 258
 259     switch(V_VT(var)) {
 260     case VT_EMPTY:
 261         *r = jsval_undefined();
 262         return S_OK;
 263     case VT_NULL:
 264         *r = jsval_null();
 265         return S_OK;
 266     case VT_BOOL:
 267         *r = jsval_bool(V_BOOL(var));
 268         return S_OK;
 269     case VT_I4:
 270         *r = jsval_number(V_I4(var));
 271         return S_OK;
 272     case VT_R8:
 273         *r = jsval_number(V_R8(var));
 274         return S_OK;
 275     case VT_BSTR: {
 276         jsstr_t *str;
 277
 278         if(V_BSTR(var)) {
 279             str = jsstr_alloc_len(V_BSTR(var), SysStringLen(V_BSTR(var)));
 280             if(!str)
 281                 return E_OUTOFMEMORY;
 282         }else {
 283             str = jsstr_null_bstr();
 284         }
 285
 286         *r = jsval_string(str);
 287         return S_OK;
 288     }
 289     case VT_DISPATCH: {
 290         if(V_DISPATCH(var))
 291             IDispatch_AddRef(V_DISPATCH(var));
 292         *r = jsval_disp(V_DISPATCH(var));
 293         return S_OK;
 294     }
 295     case VT_I1:
 296         *r = jsval_number(V_I1(var));
 297         return S_OK;
 298     case VT_UI1:
 299         *r = jsval_number(V_UI1(var));
 300         return S_OK;
 301     case VT_I2:
 302         *r = jsval_number(V_I2(var));
 303         return S_OK;
 304     case VT_UI2:
 305         *r = jsval_number(V_UI2(var));
 306         return S_OK;
 307     case VT_INT:
 308         *r = jsval_number(V_INT(var));
 309         return S_OK;
 310     case VT_UI4:
 311         *r = jsval_number(V_UI4(var));
 312         return S_OK;
 313     case VT_UI8:
 314         /*
 315          * Native doesn't support VT_UI8 here, but it's needed for IE9+ APIs
 316          * (native IE9 doesn't use jscript.dll for JavaScript).
 317          */
 318         *r = jsval_number(V_UI8(var));
 319         return S_OK;
 320     case VT_R4:
 321         *r = jsval_number(V_R4(var));
 322         return S_OK;
 323     case VT_UNKNOWN:
 324         if(V_UNKNOWN(var)) {
 325             IDispatch *disp;
 326             HRESULT hres;
 327
 328             hres = IUnknown_QueryInterface(V_UNKNOWN(var), &IID_IDispatch, (void**)&disp);
 329             if(SUCCEEDED(hres)) {
 330                 *r = jsval_disp(disp);
 331                 return S_OK;
 332             }
 333         }else {
 334             *r = jsval_disp(NULL);
 335             return S_OK;
 336         }
 337         /* fall through */
 338     default:
 339         return jsval_variant(r, var);
 340     }
 341 }
 342
 343 HRESULT jsval_to_variant(jsval_t val, VARIANT *retv)
 344 {
 345     switch(jsval_type(val)) {
 346     case JSV_UNDEFINED:
 347         V_VT(retv) = VT_EMPTY;
 348         return S_OK;
 349     case JSV_NULL:
 350         V_VT(retv) = VT_NULL;
 351         return S_OK;
 352     case JSV_OBJECT:
 353         V_VT(retv) = VT_DISPATCH;
 354         if(get_object(val))
 355             IDispatch_AddRef(get_object(val));
 356         V_DISPATCH(retv) = get_object(val);
 357         return S_OK;
 358     case JSV_STRING:
 359         V_VT(retv) = VT_BSTR;
 360         return jsstr_to_bstr(get_string(val), &V_BSTR(retv));
 361     case JSV_NUMBER: {
 362         double n = get_number(val);
 363
 364         if(is_int32(n)) {
 365             V_VT(retv) = VT_I4;
 366             V_I4(retv) = n;
 367         }else {
 368             V_VT(retv) = VT_R8;
 369             V_R8(retv) = n;
 370         }
 371
 372         return S_OK;
 373     }
 374     case JSV_BOOL:
 375         V_VT(retv) = VT_BOOL;
 376         V_BOOL(retv) = get_bool(val) ? VARIANT_TRUE : VARIANT_FALSE;
 377         return S_OK;
 378     case JSV_VARIANT:
 379         V_VT(retv) = VT_EMPTY;
 380         return VariantCopy(retv, get_variant(val));
 381     }
 382
 383     assert(0);
 384     return E_FAIL;
 385 }
 386
 387 /* ECMA-262 3rd Edition    9.1 */
 388 HRESULT to_primitive(script_ctx_t *ctx, jsval_t val, jsval_t *ret, hint_t hint)
 389 {
 390     if(is_object_instance(val)) {
 391         jsdisp_t *jsdisp;
 392         jsval_t prim;
 393         DISPID id;
 394         HRESULT hres;
 395
 396         static const WCHAR toStringW[] = {'t','o','S','t','r','i','n','g',0};
 397         static const WCHAR valueOfW[] = {'v','a','l','u','e','O','f',0};
 398
 399         if(!get_object(val)) {
 400             *ret = jsval_null();
 401             return S_OK;
 402         }
 403
 404         jsdisp = iface_to_jsdisp(get_object(val));
 405         if(!jsdisp)
 406             return disp_propget(ctx, get_object(val), DISPID_VALUE, ret);
 407
 408         if(hint == NO_HINT)
 409             hint = is_class(jsdisp, JSCLASS_DATE) ? HINT_STRING : HINT_NUMBER;
 410
 411         /* Native implementation doesn't throw TypeErrors, returns strange values */
 412
 413         hres = jsdisp_get_id(jsdisp, hint == HINT_STRING ? toStringW : valueOfW, 0, &id);
 414         if(SUCCEEDED(hres)) {
 415             hres = jsdisp_call(jsdisp, id, DISPATCH_METHOD, 0, NULL, &prim);
 416             if(FAILED(hres)) {
 417                 WARN("call error - forwarding exception\n");
 418                 jsdisp_release(jsdisp);
 419                 return hres;
 420             }else if(!is_object_instance(prim)) {
 421                 jsdisp_release(jsdisp);
 422                 *ret = prim;
 423                 return S_OK;
 424             }else {
 425                 IDispatch_Release(get_object(prim));
 426             }
 427         }
 428
 429         hres = jsdisp_get_id(jsdisp, hint == HINT_STRING ? valueOfW : toStringW, 0, &id);
 430         if(SUCCEEDED(hres)) {
 431             hres = jsdisp_call(jsdisp, id, DISPATCH_METHOD, 0, NULL, &prim);
 432             if(FAILED(hres)) {
 433                 WARN("call error - forwarding exception\n");
 434                 jsdisp_release(jsdisp);
 435                 return hres;
 436             }else if(!is_object_instance(prim)) {
 437                 jsdisp_release(jsdisp);
 438                 *ret = prim;
 439                 return S_OK;
 440             }else {
 441                 IDispatch_Release(get_object(prim));
 442             }
 443         }
 444
 445         jsdisp_release(jsdisp);
 446
 447         WARN("failed\n");
 448         return JS_E_TO_PRIMITIVE;
 449     }
 450
 451     return jsval_copy(val, ret);
 452
 453 }
 454
 455 /* ECMA-262 3rd Edition    9.2 */
 456 HRESULT to_boolean(jsval_t val, BOOL *ret)
 457 {
 458     switch(jsval_type(val)) {
 459     case JSV_UNDEFINED:
 460     case JSV_NULL:
 461         *ret = FALSE;
 462         return S_OK;
 463     case JSV_OBJECT:
 464         *ret = get_object(val) != NULL;
 465         return S_OK;
 466     case JSV_STRING:
 467         *ret = jsstr_length(get_string(val)) != 0;
 468         return S_OK;
 469     case JSV_NUMBER:
 470         *ret = !isnan(get_number(val)) && get_number(val);
 471         return S_OK;
 472     case JSV_BOOL:
 473         *ret = get_bool(val);
 474         return S_OK;
 475     case JSV_VARIANT:
 476         FIXME("unimplemented for variant %s\n", debugstr_variant(get_variant(val)));
 477         return E_NOTIMPL;
 478     }
 479
 480     assert(0);
 481     return E_FAIL;
 482 }
 483
 484 static int hex_to_int(WCHAR c)
 485 {
 486     if('0' <= c && c <= '9')
 487         return c-'0';
 488
 489     if('a' <= c && c <= 'f')
 490         return c-'a'+10;
 491
 492     if('A' <= c && c <= 'F')
 493         return c-'A'+10;
 494
 495     return -1;
 496 }
 497
 498 /* ECMA-262 3rd Edition    9.3.1 */
 499 static HRESULT str_to_number(jsstr_t *str, double *ret)
 500 {
 501     const WCHAR *ptr;
 502     BOOL neg = FALSE;
 503     DOUBLE d = 0.0;
 504
 505     static const WCHAR infinityW[] = {'I','n','f','i','n','i','t','y'};
 506
 507     ptr = jsstr_flatten(str);
 508     if(!ptr)
 509         return E_OUTOFMEMORY;
 510
 511     while(iswspace(*ptr))
 512         ptr++;
 513
 514     if(*ptr == '-') {
 515         neg = TRUE;
 516         ptr++;
 517     }else if(*ptr == '+') {
 518         ptr++;
 519     }
 520
 521     if(!wcsncmp(ptr, infinityW, ARRAY_SIZE(infinityW))) {
 522         ptr += ARRAY_SIZE(infinityW);
 523         while(*ptr && iswspace(*ptr))
 524             ptr++;
 525
 526         if(*ptr)
 527             *ret = NAN;
 528         else
 529             *ret = neg ? -INFINITY : INFINITY;
 530         return S_OK;
 531     }
 532
 533     if(*ptr == '0' && ptr[1] == 'x') {
 534         DWORD l = 0;
 535
 536         ptr += 2;
 537         while((l = hex_to_int(*ptr)) != -1) {
 538             d = d*16 + l;
 539             ptr++;
 540         }
 541
 542         *ret = d;
 543         return S_OK;
 544     }
 545
 546     while(is_digit(*ptr))
 547         d = d*10 + (*ptr++ - '0');
 548
 549     if(*ptr == 'e' || *ptr == 'E') {
 550         BOOL eneg = FALSE;
 551         LONG l = 0;
 552
 553         ptr++;
 554         if(*ptr == '-') {
 555             ptr++;
 556             eneg = TRUE;
 557         }else if(*ptr == '+') {
 558             ptr++;
 559         }
 560
 561         while(is_digit(*ptr))
 562             l = l*10 + (*ptr++ - '0');
 563         if(eneg)
 564             l = -l;
 565
 566         d *= pow(10, l);
 567     }else if(*ptr == '.') {
 568         DOUBLE dec = 0.1;
 569
 570         ptr++;
 571         while(is_digit(*ptr)) {
 572             d += dec * (*ptr++ - '0');
 573             dec *= 0.1;
 574         }
 575     }
 576
 577     while(iswspace(*ptr))
 578         ptr++;
 579
 580     if(*ptr) {
 581         *ret = NAN;
 582         return S_OK;
 583     }
 584
 585     if(neg)
 586         d = -d;
 587
 588     *ret = d;
 589     return S_OK;
 590 }
 591
 592 /* ECMA-262 3rd Edition    9.3 */
 593 HRESULT to_number(script_ctx_t *ctx, jsval_t val, double *ret)
 594 {
 595     switch(jsval_type(val)) {
 596     case JSV_UNDEFINED:
 597         *ret = NAN;
 598         return S_OK;
 599     case JSV_NULL:
 600         *ret = 0;
 601         return S_OK;
 602     case JSV_NUMBER:
 603         *ret = get_number(val);
 604         return S_OK;
 605     case JSV_STRING:
 606         return str_to_number(get_string(val), ret);
 607     case JSV_OBJECT: {
 608         jsval_t prim;
 609         HRESULT hres;
 610
 611         hres = to_primitive(ctx, val, &prim, HINT_NUMBER);
 612         if(FAILED(hres))
 613             return hres;
 614
 615         hres = to_number(ctx, prim, ret);
 616         jsval_release(prim);
 617         return hres;
 618     }
 619     case JSV_BOOL:
 620         *ret = get_bool(val) ? 1 : 0;
 621         return S_OK;
 622     case JSV_VARIANT:
 623         FIXME("unimplemented for variant %s\n", debugstr_variant(get_variant(val)));
 624         return E_NOTIMPL;
 625     };
 626
 627     assert(0);
 628     return E_FAIL;
 629 }
 630
 631 /* ECMA-262 3rd Edition    9.4 */
 632 HRESULT to_integer(script_ctx_t *ctx, jsval_t v, double *ret)
 633 {
 634     double n;
 635     HRESULT hres;
 636
 637     hres = to_number(ctx, v, &n);
 638     if(FAILED(hres))
 639         return hres;
 640
 641     if(isnan(n))
 642         *ret = 0;
 643     else
 644         *ret = n >= 0.0 ? floor(n) : -floor(-n);
 645     return S_OK;
 646 }
 647
 648 static INT32 double_to_int32(double number)
 649 {
 650     INT32 exp, result;
 651     union {
 652         double d;
 653         INT64 n;
 654     } bits;
 655
 656     bits.d = number;
 657     exp = ((INT32)(bits.n >> 52) & 0x7ff) - 0x3ff;
 658
 659     /* If exponent < 0 there will be no bits to the left of the decimal point
 660      * after rounding; if the exponent is > 83 then no bits of precision can be
 661      * left in the low 32-bit range of the result (IEEE-754 doubles have 52 bits
 662      * of fractional precision).
 663      * Note this case handles 0, -0, and all infinite, NaN & denormal values. */
 664     if(exp < 0 || exp > 83)
 665         return 0;
 666
 667     /* Select the appropriate 32-bits from the floating point mantissa.  If the
 668      * exponent is 52 then the bits we need to select are already aligned to the
 669      * lowest bits of the 64-bit integer representation of the number, no need
 670      * to shift.  If the exponent is greater than 52 we need to shift the value
 671      * left by (exp - 52), if the value is less than 52 we need to shift right
 672      * accordingly. */
 673     result = (exp > 52) ? bits.n << (exp - 52) : bits.n >> (52 - exp);
 674
 675     /* IEEE-754 double precision values are stored omitting an implicit 1 before
 676      * the decimal point; we need to reinsert this now.  We may also the shifted
 677      * invalid bits into the result that are not a part of the mantissa (the sign
 678      * and exponent bits from the floatingpoint representation); mask these out. */
 679     if(exp < 32) {
 680         INT32 missing_one = 1 << exp;
 681         result &= missing_one - 1;
 682         result += missing_one;
 683     }
 684
 685     /* If the input value was negative (we could test either 'number' or 'bits',
 686      * but testing 'bits' is likely faster) invert the result appropriately. */
 687     return bits.n < 0 ? -result : result;
 688 }
 689
 690 /* ECMA-262 3rd Edition    9.5 */
 691 HRESULT to_int32(script_ctx_t *ctx, jsval_t v, INT *ret)
 692 {
 693     double n;
 694     HRESULT hres;
 695
 696     hres = to_number(ctx, v, &n);
 697     if(FAILED(hres))
 698         return hres;
 699
 700     *ret = double_to_int32(n);
 701     return S_OK;
 702 }
 703
 704 /* ECMA-262 3rd Edition    9.6 */
 705 HRESULT to_uint32(script_ctx_t *ctx, jsval_t val, UINT32 *ret)
 706 {
 707     double n;
 708     HRESULT hres;
 709
 710     hres = to_number(ctx, val, &n);
 711     if(FAILED(hres))
 712         return hres;
 713
 714     *ret = double_to_int32(n);
 715     return S_OK;
 716 }
 717
 718 HRESULT double_to_string(double n, jsstr_t **str)
 719 {
 720     static const WCHAR InfinityW[] = {'-','I','n','f','i','n','i','t','y',0};
 721
 722     if(isnan(n)) {
 723         *str = jsstr_nan();
 724     }else if(isinf(n)) {
 725         *str = jsstr_alloc(n<0 ? InfinityW : InfinityW+1);
 726     }else if(is_int32(n)) {
 727         WCHAR buf[12];
 728         _ltow_s(n, buf, ARRAY_SIZE(buf), 10);
 729         *str = jsstr_alloc(buf);
 730     }else {
 731         VARIANT strv, v;
 732         HRESULT hres;
 733
 734         /* FIXME: Don't use VariantChangeTypeEx */
 735         V_VT(&v) = VT_R8;
 736         V_R8(&v) = n;
 737         V_VT(&strv) = VT_EMPTY;
 738         hres = VariantChangeTypeEx(&strv, &v, MAKELCID(MAKELANGID(LANG_ENGLISH,SUBLANG_ENGLISH_US),SORT_DEFAULT), 0, VT_BSTR);
 739         if(FAILED(hres))
 740             return hres;
 741
 742         *str = jsstr_alloc(V_BSTR(&strv));
 743         SysFreeString(V_BSTR(&strv));
 744     }
 745
 746     return *str ? S_OK : E_OUTOFMEMORY;
 747 }
 748
 749 /* ECMA-262 3rd Edition    9.8 */
 750 HRESULT to_string(script_ctx_t *ctx, jsval_t val, jsstr_t **str)
 751 {
 752     static const WCHAR nullW[] = {'n','u','l','l',0};
 753     static const WCHAR trueW[] = {'t','r','u','e',0};
 754     static const WCHAR falseW[] = {'f','a','l','s','e',0};
 755
 756     switch(jsval_type(val)) {
 757     case JSV_UNDEFINED:
 758         *str = jsstr_undefined();
 759         return S_OK;
 760     case JSV_NULL:
 761         *str = jsstr_alloc(nullW);
 762         break;
 763     case JSV_NUMBER:
 764         return double_to_string(get_number(val), str);
 765     case JSV_STRING:
 766         *str = jsstr_addref(get_string(val));
 767         break;
 768     case JSV_OBJECT: {
 769         jsval_t prim;
 770         HRESULT hres;
 771
 772         hres = to_primitive(ctx, val, &prim, HINT_STRING);
 773         if(FAILED(hres))
 774             return hres;
 775
 776         hres = to_string(ctx, prim, str);
 777         jsval_release(prim);
 778         return hres;
 779     }
 780     case JSV_BOOL:
 781         *str = jsstr_alloc(get_bool(val) ? trueW : falseW);
 782         break;
 783     default:
 784         FIXME("unsupported %s\n", debugstr_jsval(val));
 785         return E_NOTIMPL;
 786     }
 787
 788     return *str ? S_OK : E_OUTOFMEMORY;
 789 }
 790
 791 HRESULT to_flat_string(script_ctx_t *ctx, jsval_t val, jsstr_t **str, const WCHAR **ret_str)
 792 {
 793     HRESULT hres;
 794
 795     hres = to_string(ctx, val, str);
 796     if(FAILED(hres))
 797         return hres;
 798
 799     *ret_str = jsstr_flatten(*str);
 800     if(!*ret_str) {
 801         jsstr_release(*str);
 802         return E_OUTOFMEMORY;
 803     }
 804
 805     return S_OK;
 806 }
 807
 808 /* ECMA-262 3rd Edition    9.9 */
 809 HRESULT to_object(script_ctx_t *ctx, jsval_t val, IDispatch **disp)
 810 {
 811     jsdisp_t *dispex;
 812     HRESULT hres;
 813
 814     switch(jsval_type(val)) {
 815     case JSV_STRING:
 816         hres = create_string(ctx, get_string(val), &dispex);
 817         if(FAILED(hres))
 818             return hres;
 819
 820         *disp = to_disp(dispex);
 821         break;
 822     case JSV_NUMBER:
 823         hres = create_number(ctx, get_number(val), &dispex);
 824         if(FAILED(hres))
 825             return hres;
 826
 827         *disp = to_disp(dispex);
 828         break;
 829     case JSV_OBJECT:
 830         if(get_object(val)) {
 831             *disp = get_object(val);
 832             IDispatch_AddRef(*disp);
 833         }else {
 834             jsdisp_t *obj;
 835
 836             hres = create_object(ctx, NULL, &obj);
 837             if(FAILED(hres))
 838                 return hres;
 839
 840             *disp = to_disp(obj);
 841         }
 842         break;
 843     case JSV_BOOL:
 844         hres = create_bool(ctx, get_bool(val), &dispex);
 845         if(FAILED(hres))
 846             return hres;
 847
 848         *disp = to_disp(dispex);
 849         break;
 850     case JSV_UNDEFINED:
 851     case JSV_NULL:
 852         WARN("object expected\n");
 853         return JS_E_OBJECT_EXPECTED;
 854     case JSV_VARIANT:
 855         switch(V_VT(get_variant(val))) {
 856         case VT_ARRAY|VT_VARIANT:
 857             hres = create_vbarray(ctx, V_ARRAY(get_variant(val)), &dispex);
 858             if(FAILED(hres))
 859                 return hres;
 860
 861             *disp = to_disp(dispex);
 862             break;
 863
 864         default:
 865             FIXME("Unsupported %s\n", debugstr_variant(get_variant(val)));
 866             return E_NOTIMPL;
 867         }
 868         break;
 869     }
 870
 871     return S_OK;
 872 }
 873
 874 HRESULT variant_change_type(script_ctx_t *ctx, VARIANT *dst, VARIANT *src, VARTYPE vt)
 875 {
 876     jsexcept_t ei;
 877     jsval_t val;
 878     HRESULT hres;
 879
 880     hres = variant_to_jsval(src, &val);
 881     if(FAILED(hres))
 882         return hres;
 883
 884     enter_script(ctx, &ei);
 885
 886     switch(vt) {
 887     case VT_I2:
 888     case VT_I4: {
 889         INT i;
 890
 891         hres = to_int32(ctx, val, &i);
 892         if(SUCCEEDED(hres)) {
 893             if(vt == VT_I4)
 894                 V_I4(dst) = i;
 895             else
 896                 V_I2(dst) = i;
 897         }
 898         break;
 899     }
 900     case VT_UI2: {
 901         UINT32 i;
 902
 903         hres = to_uint32(ctx, val, &i);
 904         if(SUCCEEDED(hres))
 905             V_UI2(dst) = i;
 906         break;
 907     }
 908     case VT_R8: {
 909         double n;
 910         hres = to_number(ctx, val, &n);
 911         if(SUCCEEDED(hres))
 912             V_R8(dst) = n;
 913         break;
 914     }
 915     case VT_R4: {
 916         double n;
 917
 918         hres = to_number(ctx, val, &n);
 919         if(SUCCEEDED(hres))
 920             V_R4(dst) = n;
 921         break;
 922     }
 923     case VT_BOOL: {
 924         BOOL b;
 925
 926         hres = to_boolean(val, &b);
 927         if(SUCCEEDED(hres))
 928             V_BOOL(dst) = b ? VARIANT_TRUE : VARIANT_FALSE;
 929         break;
 930     }
 931     case VT_BSTR: {
 932         jsstr_t *str;
 933
 934         hres = to_string(ctx, val, &str);
 935         if(FAILED(hres))
 936             break;
 937
 938         hres = jsstr_to_bstr(str, &V_BSTR(dst));
 939         break;
 940     }
 941     case VT_EMPTY:
 942         hres = V_VT(src) == VT_EMPTY ? S_OK : E_NOTIMPL;
 943         break;
 944     case VT_NULL:
 945         hres = V_VT(src) == VT_NULL ? S_OK : E_NOTIMPL;
 946         break;
 947     default:
 948         FIXME("vt %d not implemented\n", vt);
 949         hres = E_NOTIMPL;
 950     }
 951
 952     jsval_release(val);
 953     leave_script(ctx, hres);
 954     if(FAILED(hres))
 955         return hres;
 956
 957     V_VT(dst) = vt;
 958     return S_OK;
 959 }
 960
 961 static inline JSCaller *impl_from_IServiceProvider(IServiceProvider *iface)
 962 {
 963     return CONTAINING_RECORD(iface, JSCaller, IServiceProvider_iface);
 964 }
 965
 966 static HRESULT WINAPI JSCaller_QueryInterface(IServiceProvider *iface, REFIID riid, void **ppv)
 967 {
 968     JSCaller *This = impl_from_IServiceProvider(iface);
 969
 970     if(IsEqualGUID(&IID_IUnknown, riid)) {
 971         TRACE("(%p)->(IID_IUnknown %p)\n", This, ppv);
 972         *ppv = &This->IServiceProvider_iface;
 973     }else if(IsEqualGUID(&IID_IServiceProvider, riid)) {
 974         TRACE("(%p)->(IID_IServiceProvider %p)\n", This, ppv);
 975         *ppv = &This->IServiceProvider_iface;
 976     }else {
 977         WARN("(%p)->(%s %p)\n", This, debugstr_guid(riid), ppv);
 978         *ppv = NULL;
 979         return E_NOINTERFACE;
 980     }
 981
 982     IUnknown_AddRef((IUnknown*)*ppv);
 983     return S_OK;
 984 }
 985
 986 static ULONG WINAPI JSCaller_AddRef(IServiceProvider *iface)
 987 {
 988     JSCaller *This = impl_from_IServiceProvider(iface);
 989     LONG ref = InterlockedIncrement(&This->ref);
 990
 991     TRACE("(%p) ref=%d\n", This, ref);
 992
 993     return ref;
 994 }
 995
 996 static ULONG WINAPI JSCaller_Release(IServiceProvider *iface)
 997 {
 998     JSCaller *This = impl_from_IServiceProvider(iface);
 999     LONG ref = InterlockedIncrement(&This->ref);
1000
1001     TRACE("(%p) ref=%d\n", This, ref);
1002
1003     if(!ref) {
1004         assert(!This->ctx);
1005         heap_free(This);
1006     }
1007
1008     return ref;
1009 }
1010
1011 static HRESULT WINAPI JSCaller_QueryService(IServiceProvider *iface, REFGUID guidService,
1012         REFIID riid, void **ppv)
1013 {
1014     JSCaller *This = impl_from_IServiceProvider(iface);
1015
1016     if(IsEqualGUID(guidService, &SID_VariantConversion) && This->ctx && This->ctx->active_script) {
1017         TRACE("(%p)->(SID_VariantConversion)\n", This);
1018         return IActiveScript_QueryInterface(This->ctx->active_script, riid, ppv);
1019     }
1020
1021     FIXME("(%p)->(%s %s %p)\n", This, debugstr_guid(guidService), debugstr_guid(riid), ppv);
1022
1023     *ppv = NULL;
1024     return E_NOINTERFACE;
1025 }
1026
1027 static const IServiceProviderVtbl ServiceProviderVtbl = {
1028     JSCaller_QueryInterface,
1029     JSCaller_AddRef,
1030     JSCaller_Release,
1031     JSCaller_QueryService
1032 };
1033
1034 HRESULT create_jscaller(script_ctx_t *ctx)
1035 {
1036     JSCaller *ret;
1037
1038     ret = heap_alloc(sizeof(*ret));
1039     if(!ret)
1040         return E_OUTOFMEMORY;
1041
1042     ret->IServiceProvider_iface.lpVtbl = &ServiceProviderVtbl;
1043     ret->ref = 1;
1044     ret->ctx = ctx;
1045
1046     ctx->jscaller = ret;
1047     return S_OK;
1048 }