dll/win32/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_jsval(const jsval_t v)
  34 {
  35     switch(jsval_type(v)) {
  36     case JSV_UNDEFINED:
  37         return "undefined";
  38     case JSV_NULL:
  39         return "null";
  40     case JSV_OBJECT:
  41         return wine_dbg_sprintf("obj(%p)", get_object(v));
  42     case JSV_STRING:
  43         return wine_dbg_sprintf("str(%s)", debugstr_jsstr(get_string(v)));
  44     case JSV_NUMBER:
  45         return wine_dbg_sprintf("%lf", get_number(v));
  46     case JSV_BOOL:
  47         return get_bool(v) ? "true" : "false";
  48     case JSV_VARIANT:
  49         return debugstr_variant(get_variant(v));
  50     }
  51
  52     assert(0);
  53     return NULL;
  54 }
  55
  56 BOOL is_finite(double n)
  57 {
  58     return !isnan(n) && !isinf(n);
  59 }
  60
  61 #define MIN_BLOCK_SIZE  128
  62 #define ARENA_FREE_FILLER  0xaa
  63
  64 static inline DWORD block_size(DWORD block)
  65 {
  66     return MIN_BLOCK_SIZE << block;
  67 }
  68
  69 void heap_pool_init(heap_pool_t *heap)
  70 {
  71     memset(heap, 0, sizeof(*heap));
  72     list_init(&heap->custom_blocks);
  73 }
  74
  75 void *heap_pool_alloc(heap_pool_t *heap, DWORD size)
  76 {
  77     struct list *list;
  78     void *tmp;
  79
  80     if(!heap->block_cnt) {
  81         if(!heap->blocks) {
  82             heap->blocks = heap_alloc(sizeof(void*));
  83             if(!heap->blocks)
  84                 return NULL;
  85         }
  86
  87         tmp = heap_alloc(block_size(0));
  88         if(!tmp)
  89             return NULL;
  90
  91         heap->blocks[0] = tmp;
  92         heap->block_cnt = 1;
  93     }
  94
  95     if(heap->offset + size <= block_size(heap->last_block)) {
  96         tmp = ((BYTE*)heap->blocks[heap->last_block])+heap->offset;
  97         heap->offset += size;
  98         return tmp;
  99     }
 100
 101     if(size <= block_size(heap->last_block+1)) {
 102         if(heap->last_block+1 == heap->block_cnt) {
 103             tmp = heap_realloc(heap->blocks, (heap->block_cnt+1)*sizeof(void*));
 104             if(!tmp)
 105                 return NULL;
 106
 107             heap->blocks = tmp;
 108             heap->blocks[heap->block_cnt] = heap_alloc(block_size(heap->block_cnt));
 109             if(!heap->blocks[heap->block_cnt])
 110                 return NULL;
 111
 112             heap->block_cnt++;
 113         }
 114
 115         heap->last_block++;
 116         heap->offset = size;
 117         return heap->blocks[heap->last_block];
 118     }
 119
 120     list = heap_alloc(size + sizeof(struct list));
 121     if(!list)
 122         return NULL;
 123
 124     list_add_head(&heap->custom_blocks, list);
 125     return list+1;
 126 }
 127
 128 void *heap_pool_grow(heap_pool_t *heap, void *mem, DWORD size, DWORD inc)
 129 {
 130     void *ret;
 131
 132     if(mem == (BYTE*)heap->blocks[heap->last_block] + heap->offset-size
 133        && heap->offset+inc < block_size(heap->last_block)) {
 134         heap->offset += inc;
 135         return mem;
 136     }
 137
 138     ret = heap_pool_alloc(heap, size+inc);
 139     if(ret) /* FIXME: avoid copying for custom blocks */
 140         memcpy(ret, mem, size);
 141     return ret;
 142 }
 143
 144 void heap_pool_clear(heap_pool_t *heap)
 145 {
 146     struct list *tmp;
 147
 148     if(!heap)
 149         return;
 150
 151     while((tmp = list_head(&heap->custom_blocks))) {
 152         list_remove(tmp);
 153         heap_free(tmp);
 154     }
 155
 156     if(WARN_ON(heap)) {
 157         DWORD i;
 158
 159         for(i=0; i < heap->block_cnt; i++)
 160             memset(heap->blocks[i], ARENA_FREE_FILLER, block_size(i));
 161     }
 162
 163     heap->last_block = heap->offset = 0;
 164     heap->mark = FALSE;
 165 }
 166
 167 void heap_pool_free(heap_pool_t *heap)
 168 {
 169     DWORD i;
 170
 171     heap_pool_clear(heap);
 172
 173     for(i=0; i < heap->block_cnt; i++)
 174         heap_free(heap->blocks[i]);
 175     heap_free(heap->blocks);
 176
 177     heap_pool_init(heap);
 178 }
 179
 180 heap_pool_t *heap_pool_mark(heap_pool_t *heap)
 181 {
 182     if(heap->mark)
 183         return NULL;
 184
 185     heap->mark = TRUE;
 186     return heap;
 187 }
 188
 189 void jsval_release(jsval_t val)
 190 {
 191     switch(jsval_type(val)) {
 192     case JSV_OBJECT:
 193         if(get_object(val))
 194             IDispatch_Release(get_object(val));
 195         break;
 196     case JSV_STRING:
 197         jsstr_release(get_string(val));
 198         break;
 199     case JSV_VARIANT:
 200         VariantClear(get_variant(val));
 201         heap_free(get_variant(val));
 202         break;
 203     default:
 204         break;
 205     }
 206 }
 207
 208 static HRESULT jsval_variant(jsval_t *val, VARIANT *var)
 209 {
 210     VARIANT *v;
 211     HRESULT hres;
 212
 213     __JSVAL_TYPE(*val) = JSV_VARIANT;
 214     __JSVAL_VAR(*val) = v = heap_alloc(sizeof(VARIANT));
 215     if(!v) {
 216         *val = jsval_undefined();
 217         return E_OUTOFMEMORY;
 218     }
 219
 220     V_VT(v) = VT_EMPTY;
 221     hres = VariantCopy(v, var);
 222     if(FAILED(hres)) {
 223         *val = jsval_undefined();
 224         heap_free(v);
 225     }
 226     return hres;
 227 }
 228
 229 HRESULT jsval_copy(jsval_t v, jsval_t *r)
 230 {
 231     switch(jsval_type(v)) {
 232     case JSV_UNDEFINED:
 233     case JSV_NULL:
 234     case JSV_NUMBER:
 235     case JSV_BOOL:
 236         *r = v;
 237         return S_OK;
 238     case JSV_OBJECT:
 239         if(get_object(v))
 240             IDispatch_AddRef(get_object(v));
 241         *r = v;
 242         return S_OK;
 243     case JSV_STRING: {
 244         jsstr_addref(get_string(v));
 245         *r = v;
 246         return S_OK;
 247     }
 248     case JSV_VARIANT:
 249         return jsval_variant(r, get_variant(v));
 250     }
 251
 252     assert(0);
 253     return E_FAIL;
 254 }
 255
 256 HRESULT variant_to_jsval(VARIANT *var, jsval_t *r)
 257 {
 258     if(V_VT(var) == (VT_VARIANT|VT_BYREF))
 259         var = V_VARIANTREF(var);
 260
 261     switch(V_VT(var)) {
 262     case VT_EMPTY:
 263         *r = jsval_undefined();
 264         return S_OK;
 265     case VT_NULL:
 266         *r = jsval_null();
 267         return S_OK;
 268     case VT_BOOL:
 269         *r = jsval_bool(V_BOOL(var));
 270         return S_OK;
 271     case VT_I4:
 272         *r = jsval_number(V_I4(var));
 273         return S_OK;
 274     case VT_R8:
 275         *r = jsval_number(V_R8(var));
 276         return S_OK;
 277     case VT_BSTR: {
 278         jsstr_t *str;
 279
 280         if(V_BSTR(var)) {
 281             str = jsstr_alloc_len(V_BSTR(var), SysStringLen(V_BSTR(var)));
 282             if(!str)
 283                 return E_OUTOFMEMORY;
 284         }else {
 285             str = jsstr_null_bstr();
 286         }
 287
 288         *r = jsval_string(str);
 289         return S_OK;
 290     }
 291     case VT_DISPATCH: {
 292         if(V_DISPATCH(var))
 293             IDispatch_AddRef(V_DISPATCH(var));
 294         *r = jsval_disp(V_DISPATCH(var));
 295         return S_OK;
 296     }
 297     case VT_I2:
 298         *r = jsval_number(V_I2(var));
 299         return S_OK;
 300     case VT_UI2:
 301         *r = jsval_number(V_UI2(var));
 302         return S_OK;
 303     case VT_INT:
 304         *r = jsval_number(V_INT(var));
 305         return S_OK;
 306     case VT_UI4:
 307         *r = jsval_number(V_UI4(var));
 308         return S_OK;
 309     case VT_UI8:
 310         /*
 311          * Native doesn't support VT_UI8 here, but it's needed for IE9+ APIs
 312          * (native IE9 doesn't use jscript.dll for JavaScript).
 313          */
 314         *r = jsval_number(V_UI8(var));
 315         return S_OK;
 316     case VT_R4:
 317         *r = jsval_number(V_R4(var));
 318         return S_OK;
 319     case VT_UNKNOWN:
 320         if(V_UNKNOWN(var)) {
 321             IDispatch *disp;
 322             HRESULT hres;
 323
 324             hres = IUnknown_QueryInterface(V_UNKNOWN(var), &IID_IDispatch, (void**)&disp);
 325             if(SUCCEEDED(hres)) {
 326                 *r = jsval_disp(disp);
 327                 return S_OK;
 328             }
 329         }else {
 330             *r = jsval_disp(NULL);
 331             return S_OK;
 332         }
 333         /* fall through */
 334     default:
 335         return jsval_variant(r, var);
 336     }
 337 }
 338
 339 HRESULT jsval_to_variant(jsval_t val, VARIANT *retv)
 340 {
 341     switch(jsval_type(val)) {
 342     case JSV_UNDEFINED:
 343         V_VT(retv) = VT_EMPTY;
 344         return S_OK;
 345     case JSV_NULL:
 346         V_VT(retv) = VT_NULL;
 347         return S_OK;
 348     case JSV_OBJECT:
 349         V_VT(retv) = VT_DISPATCH;
 350         if(get_object(val))
 351             IDispatch_AddRef(get_object(val));
 352         V_DISPATCH(retv) = get_object(val);
 353         return S_OK;
 354     case JSV_STRING: {
 355         jsstr_t *str = get_string(val);
 356
 357         V_VT(retv) = VT_BSTR;
 358         if(is_null_bstr(str)) {
 359             V_BSTR(retv) = NULL;
 360         }else {
 361             V_BSTR(retv) = SysAllocStringLen(NULL, jsstr_length(str));
 362             if(V_BSTR(retv))
 363                 jsstr_flush(str, V_BSTR(retv));
 364             else
 365                 return E_OUTOFMEMORY;
 366         }
 367         return S_OK;
 368     }
 369     case JSV_NUMBER: {
 370         double n = get_number(val);
 371
 372         if(is_int32(n)) {
 373             V_VT(retv) = VT_I4;
 374             V_I4(retv) = n;
 375         }else {
 376             V_VT(retv) = VT_R8;
 377             V_R8(retv) = n;
 378         }
 379
 380         return S_OK;
 381     }
 382     case JSV_BOOL:
 383         V_VT(retv) = VT_BOOL;
 384         V_BOOL(retv) = get_bool(val) ? VARIANT_TRUE : VARIANT_FALSE;
 385         return S_OK;
 386     case JSV_VARIANT:
 387         V_VT(retv) = VT_EMPTY;
 388         return VariantCopy(retv, get_variant(val));
 389     }
 390
 391     assert(0);
 392     return E_FAIL;
 393 }
 394
 395 /* ECMA-262 3rd Edition    9.1 */
 396 HRESULT to_primitive(script_ctx_t *ctx, jsval_t val, jsval_t *ret, hint_t hint)
 397 {
 398     if(is_object_instance(val)) {
 399         jsdisp_t *jsdisp;
 400         jsval_t prim;
 401         DISPID id;
 402         HRESULT hres;
 403
 404         static const WCHAR toStringW[] = {'t','o','S','t','r','i','n','g',0};
 405         static const WCHAR valueOfW[] = {'v','a','l','u','e','O','f',0};
 406
 407         if(!get_object(val)) {
 408             *ret = jsval_null();
 409             return S_OK;
 410         }
 411
 412         jsdisp = iface_to_jsdisp(get_object(val));
 413         if(!jsdisp)
 414             return disp_propget(ctx, get_object(val), DISPID_VALUE, ret);
 415
 416         if(hint == NO_HINT)
 417             hint = is_class(jsdisp, JSCLASS_DATE) ? HINT_STRING : HINT_NUMBER;
 418
 419         /* Native implementation doesn't throw TypeErrors, returns strange values */
 420
 421         hres = jsdisp_get_id(jsdisp, hint == HINT_STRING ? toStringW : valueOfW, 0, &id);
 422         if(SUCCEEDED(hres)) {
 423             hres = jsdisp_call(jsdisp, id, DISPATCH_METHOD, 0, NULL, &prim);
 424             if(FAILED(hres)) {
 425                 WARN("call error - forwarding exception\n");
 426                 jsdisp_release(jsdisp);
 427                 return hres;
 428             }else if(!is_object_instance(prim)) {
 429                 jsdisp_release(jsdisp);
 430                 *ret = prim;
 431                 return S_OK;
 432             }else {
 433                 IDispatch_Release(get_object(prim));
 434             }
 435         }
 436
 437         hres = jsdisp_get_id(jsdisp, hint == HINT_STRING ? valueOfW : toStringW, 0, &id);
 438         if(SUCCEEDED(hres)) {
 439             hres = jsdisp_call(jsdisp, id, DISPATCH_METHOD, 0, NULL, &prim);
 440             if(FAILED(hres)) {
 441                 WARN("call error - forwarding exception\n");
 442                 jsdisp_release(jsdisp);
 443                 return hres;
 444             }else if(!is_object_instance(prim)) {
 445                 jsdisp_release(jsdisp);
 446                 *ret = prim;
 447                 return S_OK;
 448             }else {
 449                 IDispatch_Release(get_object(prim));
 450             }
 451         }
 452
 453         jsdisp_release(jsdisp);
 454
 455         WARN("failed\n");
 456         return throw_type_error(ctx, JS_E_TO_PRIMITIVE, NULL);
 457     }
 458
 459     return jsval_copy(val, ret);
 460
 461 }
 462
 463 /* ECMA-262 3rd Edition    9.2 */
 464 HRESULT to_boolean(jsval_t val, BOOL *ret)
 465 {
 466     switch(jsval_type(val)) {
 467     case JSV_UNDEFINED:
 468     case JSV_NULL:
 469         *ret = FALSE;
 470         return S_OK;
 471     case JSV_OBJECT:
 472         *ret = get_object(val) != NULL;
 473         return S_OK;
 474     case JSV_STRING:
 475         *ret = jsstr_length(get_string(val)) != 0;
 476         return S_OK;
 477     case JSV_NUMBER:
 478         *ret = !isnan(get_number(val)) && get_number(val);
 479         return S_OK;
 480     case JSV_BOOL:
 481         *ret = get_bool(val);
 482         return S_OK;
 483     case JSV_VARIANT:
 484         FIXME("unimplemented for variant %s\n", debugstr_variant(get_variant(val)));
 485         return E_NOTIMPL;
 486     }
 487
 488     assert(0);
 489     return E_FAIL;
 490 }
 491
 492 static int hex_to_int(WCHAR c)
 493 {
 494     if('0' <= c && c <= '9')
 495         return c-'0';
 496
 497     if('a' <= c && c <= 'f')
 498         return c-'a'+10;
 499
 500     if('A' <= c && c <= 'F')
 501         return c-'A'+10;
 502
 503     return -1;
 504 }
 505
 506 /* ECMA-262 3rd Edition    9.3.1 */
 507 static HRESULT str_to_number(jsstr_t *str, double *ret)
 508 {
 509     const WCHAR *ptr;
 510     BOOL neg = FALSE;
 511     DOUBLE d = 0.0;
 512
 513     static const WCHAR infinityW[] = {'I','n','f','i','n','i','t','y'};
 514
 515     ptr = jsstr_flatten(str);
 516     if(!ptr)
 517         return E_OUTOFMEMORY;
 518
 519     while(isspaceW(*ptr))
 520         ptr++;
 521
 522     if(*ptr == '-') {
 523         neg = TRUE;
 524         ptr++;
 525     }else if(*ptr == '+') {
 526         ptr++;
 527     }
 528
 529     if(!strncmpW(ptr, infinityW, sizeof(infinityW)/sizeof(WCHAR))) {
 530         ptr += sizeof(infinityW)/sizeof(WCHAR);
 531         while(*ptr && isspaceW(*ptr))
 532             ptr++;
 533
 534         if(*ptr)
 535             *ret = NAN;
 536         else
 537             *ret = neg ? -INFINITY : INFINITY;
 538         return S_OK;
 539     }
 540
 541     if(*ptr == '0' && ptr[1] == 'x') {
 542         DWORD l = 0;
 543
 544         ptr += 2;
 545         while((l = hex_to_int(*ptr)) != -1) {
 546             d = d*16 + l;
 547             ptr++;
 548         }
 549
 550         *ret = d;
 551         return S_OK;
 552     }
 553
 554     while(isdigitW(*ptr))
 555         d = d*10 + (*ptr++ - '0');
 556
 557     if(*ptr == 'e' || *ptr == 'E') {
 558         BOOL eneg = FALSE;
 559         LONG l = 0;
 560
 561         ptr++;
 562         if(*ptr == '-') {
 563             ptr++;
 564             eneg = TRUE;
 565         }else if(*ptr == '+') {
 566             ptr++;
 567         }
 568
 569         while(isdigitW(*ptr))
 570             l = l*10 + (*ptr++ - '0');
 571         if(eneg)
 572             l = -l;
 573
 574         d *= pow(10, l);
 575     }else if(*ptr == '.') {
 576         DOUBLE dec = 0.1;
 577
 578         ptr++;
 579         while(isdigitW(*ptr)) {
 580             d += dec * (*ptr++ - '0');
 581             dec *= 0.1;
 582         }
 583     }
 584
 585     while(isspaceW(*ptr))
 586         ptr++;
 587
 588     if(*ptr) {
 589         *ret = NAN;
 590         return S_OK;
 591     }
 592
 593     if(neg)
 594         d = -d;
 595
 596     *ret = d;
 597     return S_OK;
 598 }
 599
 600 /* ECMA-262 3rd Edition    9.3 */
 601 HRESULT to_number(script_ctx_t *ctx, jsval_t val, double *ret)
 602 {
 603     switch(jsval_type(val)) {
 604     case JSV_UNDEFINED:
 605         *ret = NAN;
 606         return S_OK;
 607     case JSV_NULL:
 608         *ret = 0;
 609         return S_OK;
 610     case JSV_NUMBER:
 611         *ret = get_number(val);
 612         return S_OK;
 613     case JSV_STRING:
 614         return str_to_number(get_string(val), ret);
 615     case JSV_OBJECT: {
 616         jsval_t prim;
 617         HRESULT hres;
 618
 619         hres = to_primitive(ctx, val, &prim, HINT_NUMBER);
 620         if(FAILED(hres))
 621             return hres;
 622
 623         hres = to_number(ctx, prim, ret);
 624         jsval_release(prim);
 625         return hres;
 626     }
 627     case JSV_BOOL:
 628         *ret = get_bool(val) ? 1 : 0;
 629         return S_OK;
 630     case JSV_VARIANT:
 631         FIXME("unimplemented for variant %s\n", debugstr_variant(get_variant(val)));
 632         return E_NOTIMPL;
 633     };
 634
 635     assert(0);
 636     return E_FAIL;
 637 }
 638
 639 /* ECMA-262 3rd Edition    9.4 */
 640 HRESULT to_integer(script_ctx_t *ctx, jsval_t v, double *ret)
 641 {
 642     double n;
 643     HRESULT hres;
 644
 645     hres = to_number(ctx, v, &n);
 646     if(FAILED(hres))
 647         return hres;
 648
 649     if(isnan(n))
 650         *ret = 0;
 651     else
 652         *ret = n >= 0.0 ? floor(n) : -floor(-n);
 653     return S_OK;
 654 }
 655
 656 /* ECMA-262 3rd Edition    9.5 */
 657 HRESULT to_int32(script_ctx_t *ctx, jsval_t v, INT *ret)
 658 {
 659     double n;
 660     HRESULT hres;
 661
 662     const double p32 = (double)0xffffffff + 1;
 663
 664     hres = to_number(ctx, v, &n);
 665     if(FAILED(hres))
 666         return hres;
 667
 668     if(is_finite(n))
 669         n = n > 0 ? fmod(n, p32) : -fmod(-n, p32);
 670     else
 671         n = 0;
 672
 673     *ret = (UINT32)n;
 674     return S_OK;
 675 }
 676
 677 /* ECMA-262 3rd Edition    9.6 */
 678 HRESULT to_uint32(script_ctx_t *ctx, jsval_t val, DWORD *ret)
 679 {
 680     INT32 n;
 681     HRESULT hres;
 682
 683     hres = to_int32(ctx, val, &n);
 684     if(SUCCEEDED(hres))
 685         *ret = n;
 686     return hres;
 687 }
 688
 689 static jsstr_t *int_to_string(int i)
 690 {
 691     WCHAR buf[12], *p;
 692     BOOL neg = FALSE;
 693
 694     if(!i) {
 695         static const WCHAR zeroW[] = {'0',0};
 696         return jsstr_alloc(zeroW);
 697     }
 698
 699     if(i < 0) {
 700         neg = TRUE;
 701         i = -i;
 702     }
 703
 704     p = buf + sizeof(buf)/sizeof(*buf)-1;
 705     *p-- = 0;
 706     while(i) {
 707         *p-- = i%10 + '0';
 708         i /= 10;
 709     }
 710
 711     if(neg)
 712         *p = '-';
 713     else
 714         p++;
 715
 716     return jsstr_alloc(p);
 717 }
 718
 719 HRESULT double_to_string(double n, jsstr_t **str)
 720 {
 721     const WCHAR InfinityW[] = {'-','I','n','f','i','n','i','t','y',0};
 722
 723     if(isnan(n)) {
 724         *str = jsstr_nan();
 725     }else if(isinf(n)) {
 726         *str = jsstr_alloc(n<0 ? InfinityW : InfinityW+1);
 727     }else if(is_int32(n)) {
 728         *str = int_to_string(n);
 729     }else {
 730         VARIANT strv, v;
 731         HRESULT hres;
 732
 733         /* FIXME: Don't use VariantChangeTypeEx */
 734         V_VT(&v) = VT_R8;
 735         V_R8(&v) = n;
 736         V_VT(&strv) = VT_EMPTY;
 737         hres = VariantChangeTypeEx(&strv, &v, MAKELCID(MAKELANGID(LANG_ENGLISH,SUBLANG_ENGLISH_US),SORT_DEFAULT), 0, VT_BSTR);
 738         if(FAILED(hres))
 739             return hres;
 740
 741         *str = jsstr_alloc(V_BSTR(&strv));
 742         SysFreeString(V_BSTR(&strv));
 743     }
 744
 745     return *str ? S_OK : E_OUTOFMEMORY;
 746 }
 747
 748 /* ECMA-262 3rd Edition    9.8 */
 749 HRESULT to_string(script_ctx_t *ctx, jsval_t val, jsstr_t **str)
 750 {
 751     const WCHAR nullW[] = {'n','u','l','l',0};
 752     const WCHAR trueW[] = {'t','r','u','e',0};
 753     const WCHAR falseW[] = {'f','a','l','s','e',0};
 754
 755     switch(jsval_type(val)) {
 756     case JSV_UNDEFINED:
 757         *str = jsstr_undefined();
 758         return S_OK;
 759     case JSV_NULL:
 760         *str = jsstr_alloc(nullW);
 761         break;
 762     case JSV_NUMBER:
 763         return double_to_string(get_number(val), str);
 764     case JSV_STRING:
 765         *str = jsstr_addref(get_string(val));
 766         break;
 767     case JSV_OBJECT: {
 768         jsval_t prim;
 769         HRESULT hres;
 770
 771         hres = to_primitive(ctx, val, &prim, HINT_STRING);
 772         if(FAILED(hres))
 773             return hres;
 774
 775         hres = to_string(ctx, prim, str);
 776         jsval_release(prim);
 777         return hres;
 778     }
 779     case JSV_BOOL:
 780         *str = jsstr_alloc(get_bool(val) ? trueW : falseW);
 781         break;
 782     default:
 783         FIXME("unsupported %s\n", debugstr_jsval(val));
 784         return E_NOTIMPL;
 785     }
 786
 787     return *str ? S_OK : E_OUTOFMEMORY;
 788 }
 789
 790 HRESULT to_flat_string(script_ctx_t *ctx, jsval_t val, jsstr_t **str, const WCHAR **ret_str)
 791 {
 792     HRESULT hres;
 793
 794     hres = to_string(ctx, val, str);
 795     if(FAILED(hres))
 796         return hres;
 797
 798     *ret_str = jsstr_flatten(*str);
 799     if(!*ret_str) {
 800         jsstr_release(*str);
 801         return E_OUTOFMEMORY;
 802     }
 803
 804     return S_OK;
 805 }
 806
 807 /* ECMA-262 3rd Edition    9.9 */
 808 HRESULT to_object(script_ctx_t *ctx, jsval_t val, IDispatch **disp)
 809 {
 810     jsdisp_t *dispex;
 811     HRESULT hres;
 812
 813     switch(jsval_type(val)) {
 814     case JSV_STRING:
 815         hres = create_string(ctx, get_string(val), &dispex);
 816         if(FAILED(hres))
 817             return hres;
 818
 819         *disp = to_disp(dispex);
 820         break;
 821     case JSV_NUMBER:
 822         hres = create_number(ctx, get_number(val), &dispex);
 823         if(FAILED(hres))
 824             return hres;
 825
 826         *disp = to_disp(dispex);
 827         break;
 828     case JSV_OBJECT:
 829         if(get_object(val)) {
 830             *disp = get_object(val);
 831             IDispatch_AddRef(*disp);
 832         }else {
 833             jsdisp_t *obj;
 834
 835             hres = create_object(ctx, NULL, &obj);
 836             if(FAILED(hres))
 837                 return hres;
 838
 839             *disp = to_disp(obj);
 840         }
 841         break;
 842     case JSV_BOOL:
 843         hres = create_bool(ctx, get_bool(val), &dispex);
 844         if(FAILED(hres))
 845             return hres;
 846
 847         *disp = to_disp(dispex);
 848         break;
 849     case JSV_UNDEFINED:
 850     case JSV_NULL:
 851         WARN("object expected\n");
 852         return throw_type_error(ctx, JS_E_OBJECT_EXPECTED, NULL);
 853     case JSV_VARIANT:
 854         switch(V_VT(get_variant(val))) {
 855         case VT_ARRAY|VT_VARIANT:
 856             hres = create_vbarray(ctx, V_ARRAY(get_variant(val)), &dispex);
 857             if(FAILED(hres))
 858                 return hres;
 859
 860             *disp = to_disp(dispex);
 861             break;
 862
 863         default:
 864             FIXME("Unsupported %s\n", debugstr_variant(get_variant(val)));
 865             return E_NOTIMPL;
 866         }
 867         break;
 868     }
 869
 870     return S_OK;
 871 }
 872
 873 HRESULT variant_change_type(script_ctx_t *ctx, VARIANT *dst, VARIANT *src, VARTYPE vt)
 874 {
 875     jsval_t val;
 876     HRESULT hres;
 877
 878     clear_ei(ctx);
 879     hres = variant_to_jsval(src, &val);
 880     if(FAILED(hres))
 881         return hres;
 882
 883     switch(vt) {
 884     case VT_I2:
 885     case VT_I4: {
 886         INT i;
 887
 888         hres = to_int32(ctx, val, &i);
 889         if(SUCCEEDED(hres)) {
 890             if(vt == VT_I4)
 891                 V_I4(dst) = i;
 892             else
 893                 V_I2(dst) = i;
 894         }
 895         break;
 896     }
 897     case VT_R8: {
 898         double n;
 899         hres = to_number(ctx, val, &n);
 900         if(SUCCEEDED(hres))
 901             V_R8(dst) = n;
 902         break;
 903     }
 904     case VT_R4: {
 905         double n;
 906
 907         hres = to_number(ctx, val, &n);
 908         if(SUCCEEDED(hres))
 909             V_R4(dst) = n;
 910         break;
 911     }
 912     case VT_BOOL: {
 913         BOOL b;
 914
 915         hres = to_boolean(val, &b);
 916         if(SUCCEEDED(hres))
 917             V_BOOL(dst) = b ? VARIANT_TRUE : VARIANT_FALSE;
 918         break;
 919     }
 920     case VT_BSTR: {
 921         jsstr_t *str;
 922
 923         hres = to_string(ctx, val, &str);
 924         if(FAILED(hres))
 925             break;
 926
 927         if(is_null_bstr(str)) {
 928             V_BSTR(dst) = NULL;
 929             break;
 930         }
 931
 932         V_BSTR(dst) = SysAllocStringLen(NULL, jsstr_length(str));
 933         if(V_BSTR(dst))
 934             jsstr_flush(str, V_BSTR(dst));
 935         else
 936             hres = E_OUTOFMEMORY;
 937         break;
 938     }
 939     case VT_EMPTY:
 940         hres = V_VT(src) == VT_EMPTY ? S_OK : E_NOTIMPL;
 941         break;
 942     case VT_NULL:
 943         hres = V_VT(src) == VT_NULL ? S_OK : E_NOTIMPL;
 944         break;
 945     default:
 946         FIXME("vt %d not implemented\n", vt);
 947         hres = E_NOTIMPL;
 948     }
 949
 950     jsval_release(val);
 951     if(FAILED(hres))
 952         return hres;
 953
 954     V_VT(dst) = vt;
 955     return S_OK;
 956 }
 957
 958 static inline JSCaller *impl_from_IServiceProvider(IServiceProvider *iface)
 959 {
 960     return CONTAINING_RECORD(iface, JSCaller, IServiceProvider_iface);
 961 }
 962
 963 static HRESULT WINAPI JSCaller_QueryInterface(IServiceProvider *iface, REFIID riid, void **ppv)
 964 {
 965     JSCaller *This = impl_from_IServiceProvider(iface);
 966
 967     if(IsEqualGUID(&IID_IUnknown, riid)) {
 968         TRACE("(%p)->(IID_IUnknown %p)\n", This, ppv);
 969         *ppv = &This->IServiceProvider_iface;
 970     }else if(IsEqualGUID(&IID_IServiceProvider, riid)) {
 971         TRACE("(%p)->(IID_IServiceProvider %p)\n", This, ppv);
 972         *ppv = &This->IServiceProvider_iface;
 973     }else {
 974         WARN("(%p)->(%s %p)\n", This, debugstr_guid(riid), ppv);
 975         *ppv = NULL;
 976         return E_NOINTERFACE;
 977     }
 978
 979     IUnknown_AddRef((IUnknown*)*ppv);
 980     return S_OK;
 981 }
 982
 983 static ULONG WINAPI JSCaller_AddRef(IServiceProvider *iface)
 984 {
 985     JSCaller *This = impl_from_IServiceProvider(iface);
 986     LONG ref = InterlockedIncrement(&This->ref);
 987
 988     TRACE("(%p) ref=%d\n", This, ref);
 989
 990     return ref;
 991 }
 992
 993 static ULONG WINAPI JSCaller_Release(IServiceProvider *iface)
 994 {
 995     JSCaller *This = impl_from_IServiceProvider(iface);
 996     LONG ref = InterlockedIncrement(&This->ref);
 997
 998     TRACE("(%p) ref=%d\n", This, ref);
 999
1000     if(!ref) {
1001         assert(!This->ctx);
1002         heap_free(This);
1003     }
1004
1005     return ref;
1006 }
1007
1008 static HRESULT WINAPI JSCaller_QueryService(IServiceProvider *iface, REFGUID guidService,
1009         REFIID riid, void **ppv)
1010 {
1011     JSCaller *This = impl_from_IServiceProvider(iface);
1012
1013     if(IsEqualGUID(guidService, &SID_VariantConversion) && This->ctx && This->ctx->active_script) {
1014         TRACE("(%p)->(SID_VariantConversion)\n", This);
1015         return IActiveScript_QueryInterface(This->ctx->active_script, riid, ppv);
1016     }
1017
1018     FIXME("(%p)->(%s %s %p)\n", This, debugstr_guid(guidService), debugstr_guid(riid), ppv);
1019
1020     *ppv = NULL;
1021     return E_NOINTERFACE;
1022 }
1023
1024 static const IServiceProviderVtbl ServiceProviderVtbl = {
1025     JSCaller_QueryInterface,
1026     JSCaller_AddRef,
1027     JSCaller_Release,
1028     JSCaller_QueryService
1029 };
1030
1031 HRESULT create_jscaller(script_ctx_t *ctx)
1032 {
1033     JSCaller *ret;
1034
1035     ret = heap_alloc(sizeof(*ret));
1036     if(!ret)
1037         return E_OUTOFMEMORY;
1038
1039     ret->IServiceProvider_iface.lpVtbl = &ServiceProviderVtbl;
1040     ret->ref = 1;
1041     ret->ctx = ctx;
1042
1043     ctx->jscaller = ret;
1044     return S_OK;
1045 }