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 wine_dbg_sprintf("str(%s)", debugstr_jsstr(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 void jsval_release(jsval_t val)
 214 {
 215     switch(jsval_type(val)) {
 216     case JSV_OBJECT:
 217         if(get_object(val))
 218             IDispatch_Release(get_object(val));
 219         break;
 220     case JSV_STRING:
 221         jsstr_release(get_string(val));
 222         break;
 223     case JSV_VARIANT:
 224         VariantClear(get_variant(val));
 225         heap_free(get_variant(val));
 226         break;
 227     default:
 228         break;
 229     }
 230 }
 231
 232 static HRESULT jsval_variant(jsval_t *val, VARIANT *var)
 233 {
 234     VARIANT *v;
 235     HRESULT hres;
 236
 237     __JSVAL_TYPE(*val) = JSV_VARIANT;
 238     __JSVAL_VAR(*val) = v = heap_alloc(sizeof(VARIANT));
 239     if(!v)
 240         return E_OUTOFMEMORY;
 241
 242     V_VT(v) = VT_EMPTY;
 243     hres = VariantCopy(v, var);
 244     if(FAILED(hres))
 245         heap_free(v);
 246     return hres;
 247 }
 248
 249 HRESULT jsval_copy(jsval_t v, jsval_t *r)
 250 {
 251     switch(jsval_type(v)) {
 252     case JSV_UNDEFINED:
 253     case JSV_NULL:
 254     case JSV_NUMBER:
 255     case JSV_BOOL:
 256         *r = v;
 257         return S_OK;
 258     case JSV_OBJECT:
 259         if(get_object(v))
 260             IDispatch_AddRef(get_object(v));
 261         *r = v;
 262         return S_OK;
 263     case JSV_STRING: {
 264         jsstr_addref(get_string(v));
 265         *r = v;
 266         return S_OK;
 267     }
 268     case JSV_VARIANT:
 269         return jsval_variant(r, get_variant(v));
 270     }
 271
 272     assert(0);
 273     return E_FAIL;
 274 }
 275
 276 HRESULT variant_to_jsval(VARIANT *var, jsval_t *r)
 277 {
 278     switch(V_VT(var)) {
 279     case VT_EMPTY:
 280         *r = jsval_undefined();
 281         return S_OK;
 282     case VT_NULL:
 283         *r = jsval_null();
 284         return S_OK;
 285     case VT_BOOL:
 286         *r = jsval_bool(V_BOOL(var));
 287         return S_OK;
 288     case VT_I4:
 289         *r = jsval_number(V_I4(var));
 290         return S_OK;
 291     case VT_R8:
 292         *r = jsval_number(V_R8(var));
 293         return S_OK;
 294     case VT_BSTR: {
 295         jsstr_t *str;
 296
 297         str = jsstr_alloc_len(V_BSTR(var), SysStringLen(V_BSTR(var)));
 298         if(!str)
 299             return E_OUTOFMEMORY;
 300         if(!V_BSTR(var))
 301             str->length_flags |= JSSTR_FLAG_NULLBSTR;
 302
 303         *r = jsval_string(str);
 304         return S_OK;
 305     }
 306     case VT_DISPATCH: {
 307         if(V_DISPATCH(var))
 308             IDispatch_AddRef(V_DISPATCH(var));
 309         *r = jsval_disp(V_DISPATCH(var));
 310         return S_OK;
 311     }
 312     case VT_I2:
 313         *r = jsval_number(V_I2(var));
 314         return S_OK;
 315     case VT_INT:
 316         *r = jsval_number(V_INT(var));
 317         return S_OK;
 318     default:
 319         return jsval_variant(r, var);
 320     }
 321 }
 322
 323 HRESULT jsval_to_variant(jsval_t val, VARIANT *retv)
 324 {
 325     switch(jsval_type(val)) {
 326     case JSV_UNDEFINED:
 327         V_VT(retv) = VT_EMPTY;
 328         return S_OK;
 329     case JSV_NULL:
 330         V_VT(retv) = VT_NULL;
 331         return S_OK;
 332     case JSV_OBJECT:
 333         V_VT(retv) = VT_DISPATCH;
 334         if(get_object(val))
 335             IDispatch_AddRef(get_object(val));
 336         V_DISPATCH(retv) = get_object(val);
 337         return S_OK;
 338     case JSV_STRING: {
 339         jsstr_t *str = get_string(val);
 340
 341         V_VT(retv) = VT_BSTR;
 342         if(str->length_flags & JSSTR_FLAG_NULLBSTR) {
 343             V_BSTR(retv) = NULL;
 344         }else {
 345             V_BSTR(retv) = SysAllocStringLen(str->str, jsstr_length(str));
 346             if(!V_BSTR(retv))
 347                 return E_OUTOFMEMORY;
 348         }
 349         return S_OK;
 350     }
 351     case JSV_NUMBER: {
 352         double n = get_number(val);
 353
 354         if(is_int32(n)) {
 355             V_VT(retv) = VT_I4;
 356             V_I4(retv) = n;
 357         }else {
 358             V_VT(retv) = VT_R8;
 359             V_R8(retv) = n;
 360         }
 361
 362         return S_OK;
 363     }
 364     case JSV_BOOL:
 365         V_VT(retv) = VT_BOOL;
 366         V_BOOL(retv) = get_bool(val) ? VARIANT_TRUE : VARIANT_FALSE;
 367         return S_OK;
 368     case JSV_VARIANT:
 369         V_VT(retv) = VT_EMPTY;
 370         return VariantCopy(retv, get_variant(val));
 371     }
 372
 373     assert(0);
 374     return E_FAIL;
 375 }
 376
 377 /* ECMA-262 3rd Edition    9.1 */
 378 HRESULT to_primitive(script_ctx_t *ctx, jsval_t val, jsval_t *ret, hint_t hint)
 379 {
 380     if(is_object_instance(val)) {
 381         jsdisp_t *jsdisp;
 382         jsval_t prim;
 383         DISPID id;
 384         HRESULT hres;
 385
 386         static const WCHAR toStringW[] = {'t','o','S','t','r','i','n','g',0};
 387         static const WCHAR valueOfW[] = {'v','a','l','u','e','O','f',0};
 388
 389         if(!get_object(val)) {
 390             *ret = jsval_null();
 391             return S_OK;
 392         }
 393
 394         jsdisp = iface_to_jsdisp((IUnknown*)get_object(val));
 395         if(!jsdisp)
 396             return disp_propget(ctx, get_object(val), DISPID_VALUE, ret);
 397
 398         if(hint == NO_HINT)
 399             hint = is_class(jsdisp, JSCLASS_DATE) ? HINT_STRING : HINT_NUMBER;
 400
 401         /* Native implementation doesn't throw TypeErrors, returns strange values */
 402
 403         hres = jsdisp_get_id(jsdisp, hint == HINT_STRING ? toStringW : valueOfW, 0, &id);
 404         if(SUCCEEDED(hres)) {
 405             hres = jsdisp_call(jsdisp, id, DISPATCH_METHOD, 0, NULL, &prim);
 406             if(FAILED(hres)) {
 407                 WARN("call error - forwarding exception\n");
 408                 jsdisp_release(jsdisp);
 409                 return hres;
 410             }else if(!is_object_instance(prim)) {
 411                 jsdisp_release(jsdisp);
 412                 *ret = prim;
 413                 return S_OK;
 414             }else {
 415                 IDispatch_Release(get_object(prim));
 416             }
 417         }
 418
 419         hres = jsdisp_get_id(jsdisp, hint == HINT_STRING ? valueOfW : toStringW, 0, &id);
 420         if(SUCCEEDED(hres)) {
 421             hres = jsdisp_call(jsdisp, id, DISPATCH_METHOD, 0, NULL, &prim);
 422             if(FAILED(hres)) {
 423                 WARN("call error - forwarding exception\n");
 424                 jsdisp_release(jsdisp);
 425                 return hres;
 426             }else if(!is_object_instance(prim)) {
 427                 jsdisp_release(jsdisp);
 428                 *ret = prim;
 429                 return S_OK;
 430             }else {
 431                 IDispatch_Release(get_object(prim));
 432             }
 433         }
 434
 435         jsdisp_release(jsdisp);
 436
 437         WARN("failed\n");
 438         return throw_type_error(ctx, JS_E_TO_PRIMITIVE, NULL);
 439     }
 440
 441     return jsval_copy(val, ret);
 442
 443 }
 444
 445 /* ECMA-262 3rd Edition    9.2 */
 446 HRESULT to_boolean(jsval_t val, BOOL *ret)
 447 {
 448     switch(jsval_type(val)) {
 449     case JSV_UNDEFINED:
 450     case JSV_NULL:
 451         *ret = FALSE;
 452         return S_OK;
 453     case JSV_OBJECT:
 454         *ret = get_object(val) != NULL;
 455         return S_OK;
 456     case JSV_STRING:
 457         *ret = jsstr_length(get_string(val)) != 0;
 458         return S_OK;
 459     case JSV_NUMBER:
 460         *ret = !isnan(get_number(val)) && get_number(val);
 461         return S_OK;
 462     case JSV_BOOL:
 463         *ret = get_bool(val);
 464         return S_OK;
 465     case JSV_VARIANT:
 466         FIXME("unimplemented for variant %s\n", debugstr_variant(get_variant(val)));
 467         return E_NOTIMPL;
 468     }
 469
 470     assert(0);
 471     return E_FAIL;
 472 }
 473
 474 static int hex_to_int(WCHAR c)
 475 {
 476     if('0' <= c && c <= '9')
 477         return c-'0';
 478
 479     if('a' <= c && c <= 'f')
 480         return c-'a'+10;
 481
 482     if('A' <= c && c <= 'F')
 483         return c-'A'+10;
 484
 485     return -1;
 486 }
 487
 488 /* ECMA-262 3rd Edition    9.3.1 */
 489 static HRESULT str_to_number(jsstr_t *str, double *ret)
 490 {
 491     const WCHAR *ptr = str->str;
 492     BOOL neg = FALSE;
 493     DOUBLE d = 0.0;
 494
 495     static const WCHAR infinityW[] = {'I','n','f','i','n','i','t','y'};
 496
 497     if(!ptr) {
 498         *ret = 0;
 499         return S_OK;
 500     }
 501
 502     while(isspaceW(*ptr))
 503         ptr++;
 504
 505     if(*ptr == '-') {
 506         neg = TRUE;
 507         ptr++;
 508     }else if(*ptr == '+') {
 509         ptr++;
 510     }
 511
 512     if(!strncmpW(ptr, infinityW, sizeof(infinityW)/sizeof(WCHAR))) {
 513         ptr += sizeof(infinityW)/sizeof(WCHAR);
 514         while(*ptr && isspaceW(*ptr))
 515             ptr++;
 516
 517         if(*ptr)
 518             *ret = NAN;
 519         else
 520             *ret = neg ? -INFINITY : INFINITY;
 521         return S_OK;
 522     }
 523
 524     if(*ptr == '0' && ptr[1] == 'x') {
 525         DWORD l = 0;
 526
 527         ptr += 2;
 528         while((l = hex_to_int(*ptr)) != -1) {
 529             d = d*16 + l;
 530             ptr++;
 531         }
 532
 533         *ret = d;
 534         return S_OK;
 535     }
 536
 537     while(isdigitW(*ptr))
 538         d = d*10 + (*ptr++ - '0');
 539
 540     if(*ptr == 'e' || *ptr == 'E') {
 541         BOOL eneg = FALSE;
 542         LONG l = 0;
 543
 544         ptr++;
 545         if(*ptr == '-') {
 546             ptr++;
 547             eneg = TRUE;
 548         }else if(*ptr == '+') {
 549             ptr++;
 550         }
 551
 552         while(isdigitW(*ptr))
 553             l = l*10 + (*ptr++ - '0');
 554         if(eneg)
 555             l = -l;
 556
 557         d *= pow(10, l);
 558     }else if(*ptr == '.') {
 559         DOUBLE dec = 0.1;
 560
 561         ptr++;
 562         while(isdigitW(*ptr)) {
 563             d += dec * (*ptr++ - '0');
 564             dec *= 0.1;
 565         }
 566     }
 567
 568     while(isspaceW(*ptr))
 569         ptr++;
 570
 571     if(*ptr) {
 572         *ret = NAN;
 573         return S_OK;
 574     }
 575
 576     if(neg)
 577         d = -d;
 578
 579     *ret = d;
 580     return S_OK;
 581 }
 582
 583 /* ECMA-262 3rd Edition    9.3 */
 584 HRESULT to_number(script_ctx_t *ctx, jsval_t val, double *ret)
 585 {
 586     switch(jsval_type(val)) {
 587     case JSV_UNDEFINED:
 588         *ret = NAN;
 589         return S_OK;
 590     case JSV_NULL:
 591         *ret = 0;
 592         return S_OK;
 593     case JSV_NUMBER:
 594         *ret = get_number(val);
 595         return S_OK;
 596     case JSV_STRING:
 597         return str_to_number(get_string(val), ret);
 598     case JSV_OBJECT: {
 599         jsval_t prim;
 600         HRESULT hres;
 601
 602         hres = to_primitive(ctx, val, &prim, HINT_NUMBER);
 603         if(FAILED(hres))
 604             return hres;
 605
 606         hres = to_number(ctx, prim, ret);
 607         jsval_release(prim);
 608         return hres;
 609     }
 610     case JSV_BOOL:
 611         *ret = get_bool(val) ? 1 : 0;
 612         return S_OK;
 613     case JSV_VARIANT:
 614         FIXME("unimplemented for variant %s\n", debugstr_variant(get_variant(val)));
 615         return E_NOTIMPL;
 616     };
 617
 618     assert(0);
 619     return E_FAIL;
 620 }
 621
 622 /* ECMA-262 3rd Edition    9.4 */
 623 HRESULT to_integer(script_ctx_t *ctx, jsval_t v, double *ret)
 624 {
 625     double n;
 626     HRESULT hres;
 627
 628     hres = to_number(ctx, v, &n);
 629     if(FAILED(hres))
 630         return hres;
 631
 632     if(isnan(n))
 633         *ret = 0;
 634     else
 635         *ret = n >= 0.0 ? floor(n) : -floor(-n);
 636     return S_OK;
 637 }
 638
 639 /* ECMA-262 3rd Edition    9.5 */
 640 HRESULT to_int32(script_ctx_t *ctx, jsval_t v, INT *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     *ret = isnan(n) || isinf(n) ? 0 : n;
 650     return S_OK;
 651 }
 652
 653 /* ECMA-262 3rd Edition    9.6 */
 654 HRESULT to_uint32(script_ctx_t *ctx, jsval_t val, DWORD *ret)
 655 {
 656     double n;
 657     HRESULT hres;
 658
 659     hres = to_number(ctx, val, &n);
 660     if(FAILED(hres))
 661         return hres;
 662
 663     *ret = isnan(n) || isinf(n) ? 0 : n;
 664     return S_OK;
 665 }
 666
 667 static jsstr_t *int_to_string(int i)
 668 {
 669     WCHAR buf[12], *p;
 670     BOOL neg = FALSE;
 671
 672     if(!i) {
 673         static const WCHAR zeroW[] = {'0',0};
 674         return jsstr_alloc(zeroW);
 675     }
 676
 677     if(i < 0) {
 678         neg = TRUE;
 679         i = -i;
 680     }
 681
 682     p = buf + sizeof(buf)/sizeof(*buf)-1;
 683     *p-- = 0;
 684     while(i) {
 685         *p-- = i%10 + '0';
 686         i /= 10;
 687     }
 688
 689     if(neg)
 690         *p = '-';
 691     else
 692         p++;
 693
 694     return jsstr_alloc(p);
 695 }
 696
 697 HRESULT double_to_string(double n, jsstr_t **str)
 698 {
 699     const WCHAR InfinityW[] = {'-','I','n','f','i','n','i','t','y',0};
 700
 701     if(isnan(n)) {
 702         *str = jsstr_nan();
 703     }else if(isinf(n)) {
 704         *str = jsstr_alloc(n<0 ? InfinityW : InfinityW+1);
 705     }else if(is_int32(n)) {
 706         *str = int_to_string(n);
 707     }else {
 708         VARIANT strv, v;
 709         HRESULT hres;
 710
 711         /* FIXME: Don't use VariantChangeTypeEx */
 712         V_VT(&v) = VT_R8;
 713         V_R8(&v) = n;
 714         V_VT(&strv) = VT_EMPTY;
 715         hres = VariantChangeTypeEx(&strv, &v, MAKELCID(MAKELANGID(LANG_ENGLISH,SUBLANG_ENGLISH_US),SORT_DEFAULT), 0, VT_BSTR);
 716         if(FAILED(hres))
 717             return hres;
 718
 719         *str = jsstr_alloc(V_BSTR(&strv));
 720         SysFreeString(V_BSTR(&strv));
 721     }
 722
 723     return *str ? S_OK : E_OUTOFMEMORY;
 724 }
 725
 726 /* ECMA-262 3rd Edition    9.8 */
 727 HRESULT to_string(script_ctx_t *ctx, jsval_t val, jsstr_t **str)
 728 {
 729     const WCHAR undefinedW[] = {'u','n','d','e','f','i','n','e','d',0};
 730     const WCHAR nullW[] = {'n','u','l','l',0};
 731     const WCHAR trueW[] = {'t','r','u','e',0};
 732     const WCHAR falseW[] = {'f','a','l','s','e',0};
 733
 734     switch(jsval_type(val)) {
 735     case JSV_UNDEFINED:
 736         *str = jsstr_alloc(undefinedW);
 737         break;
 738     case JSV_NULL:
 739         *str = jsstr_alloc(nullW);
 740         break;
 741     case JSV_NUMBER:
 742         return double_to_string(get_number(val), str);
 743     case JSV_STRING:
 744         *str = jsstr_addref(get_string(val));
 745         break;
 746     case JSV_OBJECT: {
 747         jsval_t prim;
 748         HRESULT hres;
 749
 750         hres = to_primitive(ctx, val, &prim, HINT_STRING);
 751         if(FAILED(hres))
 752             return hres;
 753
 754         hres = to_string(ctx, prim, str);
 755         jsval_release(prim);
 756         return hres;
 757     }
 758     case JSV_BOOL:
 759         *str = jsstr_alloc(get_bool(val) ? trueW : falseW);
 760         break;
 761     default:
 762         FIXME("unsupported %s\n", debugstr_jsval(val));
 763         return E_NOTIMPL;
 764     }
 765
 766     return *str ? S_OK : E_OUTOFMEMORY;
 767 }
 768
 769 /* ECMA-262 3rd Edition    9.9 */
 770 HRESULT to_object(script_ctx_t *ctx, jsval_t val, IDispatch **disp)
 771 {
 772     jsdisp_t *dispex;
 773     HRESULT hres;
 774
 775     switch(jsval_type(val)) {
 776     case JSV_STRING:
 777         hres = create_string(ctx, get_string(val), &dispex);
 778         if(FAILED(hres))
 779             return hres;
 780
 781         *disp = to_disp(dispex);
 782         break;
 783     case JSV_NUMBER:
 784         hres = create_number(ctx, get_number(val), &dispex);
 785         if(FAILED(hres))
 786             return hres;
 787
 788         *disp = to_disp(dispex);
 789         break;
 790     case JSV_OBJECT:
 791         if(get_object(val)) {
 792             *disp = get_object(val);
 793             IDispatch_AddRef(*disp);
 794         }else {
 795             jsdisp_t *obj;
 796
 797             hres = create_object(ctx, NULL, &obj);
 798             if(FAILED(hres))
 799                 return hres;
 800
 801             *disp = to_disp(obj);
 802         }
 803         break;
 804     case JSV_BOOL:
 805         hres = create_bool(ctx, get_bool(val), &dispex);
 806         if(FAILED(hres))
 807             return hres;
 808
 809         *disp = to_disp(dispex);
 810         break;
 811     case JSV_VARIANT:
 812         switch(V_VT(get_variant(val))) {
 813         case VT_ARRAY|VT_VARIANT:
 814             hres = create_vbarray(ctx, V_ARRAY(get_variant(val)), &dispex);
 815             if(FAILED(hres))
 816                 return hres;
 817
 818             *disp = to_disp(dispex);
 819             break;
 820
 821         default:
 822             FIXME("Unsupported %s\n", debugstr_variant(get_variant(val)));
 823             return E_NOTIMPL;
 824         }
 825         break;
 826     default:
 827         FIXME("unsupported %s\n", debugstr_jsval(val));
 828         return E_NOTIMPL;
 829     }
 830
 831     return S_OK;
 832 }
 833
 834 HRESULT variant_change_type(script_ctx_t *ctx, VARIANT *dst, VARIANT *src, VARTYPE vt)
 835 {
 836     jsval_t val;
 837     HRESULT hres;
 838
 839     clear_ei(ctx);
 840     hres = variant_to_jsval(src, &val);
 841     if(FAILED(hres))
 842         return hres;
 843
 844     switch(vt) {
 845     case VT_I2:
 846     case VT_I4: {
 847         INT i;
 848
 849         hres = to_int32(ctx, val, &i);
 850         if(SUCCEEDED(hres)) {
 851             if(vt == VT_I4)
 852                 V_I4(dst) = i;
 853             else
 854                 V_I2(dst) = i;
 855         }
 856         break;
 857     }
 858     case VT_R8: {
 859         double n;
 860         hres = to_number(ctx, val, &n);
 861         if(SUCCEEDED(hres))
 862             V_R8(dst) = n;
 863         break;
 864     }
 865     case VT_R4: {
 866         double n;
 867
 868         hres = to_number(ctx, val, &n);
 869         if(SUCCEEDED(hres))
 870             V_R4(dst) = n;
 871         break;
 872     }
 873     case VT_BOOL: {
 874         BOOL b;
 875
 876         hres = to_boolean(val, &b);
 877         if(SUCCEEDED(hres))
 878             V_BOOL(dst) = b ? VARIANT_TRUE : VARIANT_FALSE;
 879         break;
 880     }
 881     case VT_BSTR: {
 882         jsstr_t *str;
 883
 884         hres = to_string(ctx, val, &str);
 885         if(FAILED(hres))
 886             break;
 887
 888         if(str->length_flags & JSSTR_FLAG_NULLBSTR) {
 889             V_BSTR(dst) = NULL;
 890             break;
 891         }
 892
 893         V_BSTR(dst) = SysAllocStringLen(str->str, jsstr_length(str));
 894         if(!V_BSTR(dst))
 895             hres = E_OUTOFMEMORY;
 896         break;
 897     }
 898     case VT_EMPTY:
 899         hres = V_VT(src) == VT_EMPTY ? S_OK : E_NOTIMPL;
 900         break;
 901     case VT_NULL:
 902         hres = V_VT(src) == VT_NULL ? S_OK : E_NOTIMPL;
 903         break;
 904     default:
 905         FIXME("vt %d not implemented\n", vt);
 906         hres = E_NOTIMPL;
 907     }
 908
 909     jsval_release(val);
 910     if(FAILED(hres))
 911         return hres;
 912
 913     V_VT(dst) = vt;
 914     return S_OK;
 915 }
 916
 917 static inline JSCaller *impl_from_IServiceProvider(IServiceProvider *iface)
 918 {
 919     return CONTAINING_RECORD(iface, JSCaller, IServiceProvider_iface);
 920 }
 921
 922 static HRESULT WINAPI JSCaller_QueryInterface(IServiceProvider *iface, REFIID riid, void **ppv)
 923 {
 924     JSCaller *This = impl_from_IServiceProvider(iface);
 925
 926     if(IsEqualGUID(&IID_IUnknown, riid)) {
 927         TRACE("(%p)->(IID_IUnknown %p)\n", This, ppv);
 928         *ppv = &This->IServiceProvider_iface;
 929     }else if(IsEqualGUID(&IID_IServiceProvider, riid)) {
 930         TRACE("(%p)->(IID_IServiceProvider %p)\n", This, ppv);
 931         *ppv = &This->IServiceProvider_iface;
 932     }else {
 933         WARN("(%p)->(%s %p)\n", This, debugstr_guid(riid), ppv);
 934         *ppv = NULL;
 935         return E_NOINTERFACE;
 936     }
 937
 938     IUnknown_AddRef((IUnknown*)*ppv);
 939     return S_OK;
 940 }
 941
 942 static ULONG WINAPI JSCaller_AddRef(IServiceProvider *iface)
 943 {
 944     JSCaller *This = impl_from_IServiceProvider(iface);
 945     LONG ref = InterlockedIncrement(&This->ref);
 946
 947     TRACE("(%p) ref=%d\n", This, ref);
 948
 949     return ref;
 950 }
 951
 952 static ULONG WINAPI JSCaller_Release(IServiceProvider *iface)
 953 {
 954     JSCaller *This = impl_from_IServiceProvider(iface);
 955     LONG ref = InterlockedIncrement(&This->ref);
 956
 957     TRACE("(%p) ref=%d\n", This, ref);
 958
 959     if(!ref) {
 960         assert(!This->ctx);
 961         heap_free(This);
 962     }
 963
 964     return ref;
 965 }
 966
 967 static HRESULT WINAPI JSCaller_QueryService(IServiceProvider *iface, REFGUID guidService,
 968         REFIID riid, void **ppv)
 969 {
 970     JSCaller *This = impl_from_IServiceProvider(iface);
 971
 972     if(IsEqualGUID(guidService, &SID_VariantConversion) && This->ctx && This->ctx->active_script) {
 973         TRACE("(%p)->(SID_VariantConversion)\n", This);
 974         return IActiveScript_QueryInterface(This->ctx->active_script, riid, ppv);
 975     }
 976
 977     FIXME("(%p)->(%s %s %p)\n", This, debugstr_guid(guidService), debugstr_guid(riid), ppv);
 978
 979     *ppv = NULL;
 980     return E_NOINTERFACE;
 981 }
 982
 983 static const IServiceProviderVtbl ServiceProviderVtbl = {
 984     JSCaller_QueryInterface,
 985     JSCaller_AddRef,
 986     JSCaller_Release,
 987     JSCaller_QueryService
 988 };
 989
 990 HRESULT create_jscaller(script_ctx_t *ctx)
 991 {
 992     JSCaller *ret;
 993
 994     ret = heap_alloc(sizeof(*ret));
 995     if(!ret)
 996         return E_OUTOFMEMORY;
 997
 998     ret->IServiceProvider_iface.lpVtbl = &ServiceProviderVtbl;
 999     ret->ref = 1;
1000     ret->ctx = ctx;
1001
1002     ctx->jscaller = ret;
1003     return S_OK;
1004 }