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 heap_pool_init(heap_pool_t *heap)
  94 {
  95     memset(heap, 0, sizeof(*heap));
  96     list_init(&heap->custom_blocks);
  97 }
  98
  99 void *heap_pool_alloc(heap_pool_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 *heap_pool_grow(heap_pool_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 = heap_pool_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 heap_pool_clear(heap_pool_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 heap_pool_free(heap_pool_t *heap)
 192 {
 193     DWORD i;
 194
 195     heap_pool_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     heap_pool_init(heap);
 202 }
 203
 204 heap_pool_t *heap_pool_mark(heap_pool_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         if(V_BSTR(var)) {
 298             str = jsstr_alloc_len(V_BSTR(var), SysStringLen(V_BSTR(var)));
 299             if(!str)
 300                 return E_OUTOFMEMORY;
 301         }else {
 302             str = jsstr_null_bstr();
 303         }
 304
 305         *r = jsval_string(str);
 306         return S_OK;
 307     }
 308     case VT_DISPATCH: {
 309         if(V_DISPATCH(var))
 310             IDispatch_AddRef(V_DISPATCH(var));
 311         *r = jsval_disp(V_DISPATCH(var));
 312         return S_OK;
 313     }
 314     case VT_I2:
 315         *r = jsval_number(V_I2(var));
 316         return S_OK;
 317     case VT_INT:
 318         *r = jsval_number(V_INT(var));
 319         return S_OK;
 320     case VT_UNKNOWN:
 321         if(V_UNKNOWN(var)) {
 322             IDispatch *disp;
 323             HRESULT hres;
 324
 325             hres = IUnknown_QueryInterface(V_UNKNOWN(var), &IID_IDispatch, (void**)&disp);
 326             if(SUCCEEDED(hres)) {
 327                 *r = jsval_disp(disp);
 328                 return S_OK;
 329             }
 330         }
 331         /* fall through */
 332     default:
 333         return jsval_variant(r, var);
 334     }
 335 }
 336
 337 HRESULT jsval_to_variant(jsval_t val, VARIANT *retv)
 338 {
 339     switch(jsval_type(val)) {
 340     case JSV_UNDEFINED:
 341         V_VT(retv) = VT_EMPTY;
 342         return S_OK;
 343     case JSV_NULL:
 344         V_VT(retv) = VT_NULL;
 345         return S_OK;
 346     case JSV_OBJECT:
 347         V_VT(retv) = VT_DISPATCH;
 348         if(get_object(val))
 349             IDispatch_AddRef(get_object(val));
 350         V_DISPATCH(retv) = get_object(val);
 351         return S_OK;
 352     case JSV_STRING: {
 353         jsstr_t *str = get_string(val);
 354
 355         V_VT(retv) = VT_BSTR;
 356         if(is_null_bstr(str)) {
 357             V_BSTR(retv) = NULL;
 358         }else {
 359             V_BSTR(retv) = SysAllocStringLen(NULL, jsstr_length(str));
 360             if(V_BSTR(retv))
 361                 jsstr_flush(str, V_BSTR(retv));
 362             else
 363                 return E_OUTOFMEMORY;
 364         }
 365         return S_OK;
 366     }
 367     case JSV_NUMBER: {
 368         double n = get_number(val);
 369
 370         if(is_int32(n)) {
 371             V_VT(retv) = VT_I4;
 372             V_I4(retv) = n;
 373         }else {
 374             V_VT(retv) = VT_R8;
 375             V_R8(retv) = n;
 376         }
 377
 378         return S_OK;
 379     }
 380     case JSV_BOOL:
 381         V_VT(retv) = VT_BOOL;
 382         V_BOOL(retv) = get_bool(val) ? VARIANT_TRUE : VARIANT_FALSE;
 383         return S_OK;
 384     case JSV_VARIANT:
 385         V_VT(retv) = VT_EMPTY;
 386         return VariantCopy(retv, get_variant(val));
 387     }
 388
 389     assert(0);
 390     return E_FAIL;
 391 }
 392
 393 /* ECMA-262 3rd Edition    9.1 */
 394 HRESULT to_primitive(script_ctx_t *ctx, jsval_t val, jsval_t *ret, hint_t hint)
 395 {
 396     if(is_object_instance(val)) {
 397         jsdisp_t *jsdisp;
 398         jsval_t prim;
 399         DISPID id;
 400         HRESULT hres;
 401
 402         static const WCHAR toStringW[] = {'t','o','S','t','r','i','n','g',0};
 403         static const WCHAR valueOfW[] = {'v','a','l','u','e','O','f',0};
 404
 405         if(!get_object(val)) {
 406             *ret = jsval_null();
 407             return S_OK;
 408         }
 409
 410         jsdisp = iface_to_jsdisp((IUnknown*)get_object(val));
 411         if(!jsdisp)
 412             return disp_propget(ctx, get_object(val), DISPID_VALUE, ret);
 413
 414         if(hint == NO_HINT)
 415             hint = is_class(jsdisp, JSCLASS_DATE) ? HINT_STRING : HINT_NUMBER;
 416
 417         /* Native implementation doesn't throw TypeErrors, returns strange values */
 418
 419         hres = jsdisp_get_id(jsdisp, hint == HINT_STRING ? toStringW : valueOfW, 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         hres = jsdisp_get_id(jsdisp, hint == HINT_STRING ? valueOfW : toStringW, 0, &id);
 436         if(SUCCEEDED(hres)) {
 437             hres = jsdisp_call(jsdisp, id, DISPATCH_METHOD, 0, NULL, &prim);
 438             if(FAILED(hres)) {
 439                 WARN("call error - forwarding exception\n");
 440                 jsdisp_release(jsdisp);
 441                 return hres;
 442             }else if(!is_object_instance(prim)) {
 443                 jsdisp_release(jsdisp);
 444                 *ret = prim;
 445                 return S_OK;
 446             }else {
 447                 IDispatch_Release(get_object(prim));
 448             }
 449         }
 450
 451         jsdisp_release(jsdisp);
 452
 453         WARN("failed\n");
 454         return throw_type_error(ctx, JS_E_TO_PRIMITIVE, NULL);
 455     }
 456
 457     return jsval_copy(val, ret);
 458
 459 }
 460
 461 /* ECMA-262 3rd Edition    9.2 */
 462 HRESULT to_boolean(jsval_t val, BOOL *ret)
 463 {
 464     switch(jsval_type(val)) {
 465     case JSV_UNDEFINED:
 466     case JSV_NULL:
 467         *ret = FALSE;
 468         return S_OK;
 469     case JSV_OBJECT:
 470         *ret = get_object(val) != NULL;
 471         return S_OK;
 472     case JSV_STRING:
 473         *ret = jsstr_length(get_string(val)) != 0;
 474         return S_OK;
 475     case JSV_NUMBER:
 476         *ret = !isnan(get_number(val)) && get_number(val);
 477         return S_OK;
 478     case JSV_BOOL:
 479         *ret = get_bool(val);
 480         return S_OK;
 481     case JSV_VARIANT:
 482         FIXME("unimplemented for variant %s\n", debugstr_variant(get_variant(val)));
 483         return E_NOTIMPL;
 484     }
 485
 486     assert(0);
 487     return E_FAIL;
 488 }
 489
 490 static int hex_to_int(WCHAR c)
 491 {
 492     if('0' <= c && c <= '9')
 493         return c-'0';
 494
 495     if('a' <= c && c <= 'f')
 496         return c-'a'+10;
 497
 498     if('A' <= c && c <= 'F')
 499         return c-'A'+10;
 500
 501     return -1;
 502 }
 503
 504 /* ECMA-262 3rd Edition    9.3.1 */
 505 static HRESULT str_to_number(jsstr_t *str, double *ret)
 506 {
 507     const WCHAR *ptr;
 508     BOOL neg = FALSE;
 509     DOUBLE d = 0.0;
 510
 511     static const WCHAR infinityW[] = {'I','n','f','i','n','i','t','y'};
 512
 513     ptr = jsstr_flatten(str);
 514     if(!ptr)
 515         return E_OUTOFMEMORY;
 516
 517     while(isspaceW(*ptr))
 518         ptr++;
 519
 520     if(*ptr == '-') {
 521         neg = TRUE;
 522         ptr++;
 523     }else if(*ptr == '+') {
 524         ptr++;
 525     }
 526
 527     if(!strncmpW(ptr, infinityW, sizeof(infinityW)/sizeof(WCHAR))) {
 528         ptr += sizeof(infinityW)/sizeof(WCHAR);
 529         while(*ptr && isspaceW(*ptr))
 530             ptr++;
 531
 532         if(*ptr)
 533             *ret = NAN;
 534         else
 535             *ret = neg ? -INFINITY : INFINITY;
 536         return S_OK;
 537     }
 538
 539     if(*ptr == '0' && ptr[1] == 'x') {
 540         DWORD l = 0;
 541
 542         ptr += 2;
 543         while((l = hex_to_int(*ptr)) != -1) {
 544             d = d*16 + l;
 545             ptr++;
 546         }
 547
 548         *ret = d;
 549         return S_OK;
 550     }
 551
 552     while(isdigitW(*ptr))
 553         d = d*10 + (*ptr++ - '0');
 554
 555     if(*ptr == 'e' || *ptr == 'E') {
 556         BOOL eneg = FALSE;
 557         LONG l = 0;
 558
 559         ptr++;
 560         if(*ptr == '-') {
 561             ptr++;
 562             eneg = TRUE;
 563         }else if(*ptr == '+') {
 564             ptr++;
 565         }
 566
 567         while(isdigitW(*ptr))
 568             l = l*10 + (*ptr++ - '0');
 569         if(eneg)
 570             l = -l;
 571
 572         d *= pow(10, l);
 573     }else if(*ptr == '.') {
 574         DOUBLE dec = 0.1;
 575
 576         ptr++;
 577         while(isdigitW(*ptr)) {
 578             d += dec * (*ptr++ - '0');
 579             dec *= 0.1;
 580         }
 581     }
 582
 583     while(isspaceW(*ptr))
 584         ptr++;
 585
 586     if(*ptr) {
 587         *ret = NAN;
 588         return S_OK;
 589     }
 590
 591     if(neg)
 592         d = -d;
 593
 594     *ret = d;
 595     return S_OK;
 596 }
 597
 598 /* ECMA-262 3rd Edition    9.3 */
 599 HRESULT to_number(script_ctx_t *ctx, jsval_t val, double *ret)
 600 {
 601     switch(jsval_type(val)) {
 602     case JSV_UNDEFINED:
 603         *ret = NAN;
 604         return S_OK;
 605     case JSV_NULL:
 606         *ret = 0;
 607         return S_OK;
 608     case JSV_NUMBER:
 609         *ret = get_number(val);
 610         return S_OK;
 611     case JSV_STRING:
 612         return str_to_number(get_string(val), ret);
 613     case JSV_OBJECT: {
 614         jsval_t prim;
 615         HRESULT hres;
 616
 617         hres = to_primitive(ctx, val, &prim, HINT_NUMBER);
 618         if(FAILED(hres))
 619             return hres;
 620
 621         hres = to_number(ctx, prim, ret);
 622         jsval_release(prim);
 623         return hres;
 624     }
 625     case JSV_BOOL:
 626         *ret = get_bool(val) ? 1 : 0;
 627         return S_OK;
 628     case JSV_VARIANT:
 629         FIXME("unimplemented for variant %s\n", debugstr_variant(get_variant(val)));
 630         return E_NOTIMPL;
 631     };
 632
 633     assert(0);
 634     return E_FAIL;
 635 }
 636
 637 /* ECMA-262 3rd Edition    9.4 */
 638 HRESULT to_integer(script_ctx_t *ctx, jsval_t v, double *ret)
 639 {
 640     double n;
 641     HRESULT hres;
 642
 643     hres = to_number(ctx, v, &n);
 644     if(FAILED(hres))
 645         return hres;
 646
 647     if(isnan(n))
 648         *ret = 0;
 649     else
 650         *ret = n >= 0.0 ? floor(n) : -floor(-n);
 651     return S_OK;
 652 }
 653
 654 /* ECMA-262 3rd Edition    9.5 */
 655 HRESULT to_int32(script_ctx_t *ctx, jsval_t v, INT *ret)
 656 {
 657     double n;
 658     HRESULT hres;
 659
 660     hres = to_number(ctx, v, &n);
 661     if(FAILED(hres))
 662         return hres;
 663
 664     *ret = isnan(n) || isinf(n) ? 0 : n;
 665     return S_OK;
 666 }
 667
 668 /* ECMA-262 3rd Edition    9.6 */
 669 HRESULT to_uint32(script_ctx_t *ctx, jsval_t val, DWORD *ret)
 670 {
 671     INT32 n;
 672     HRESULT hres;
 673
 674     hres = to_int32(ctx, val, &n);
 675     if(SUCCEEDED(hres))
 676         *ret = n;
 677     return hres;
 678 }
 679
 680 static jsstr_t *int_to_string(int i)
 681 {
 682     WCHAR buf[12], *p;
 683     BOOL neg = FALSE;
 684
 685     if(!i) {
 686         static const WCHAR zeroW[] = {'0',0};
 687         return jsstr_alloc(zeroW);
 688     }
 689
 690     if(i < 0) {
 691         neg = TRUE;
 692         i = -i;
 693     }
 694
 695     p = buf + sizeof(buf)/sizeof(*buf)-1;
 696     *p-- = 0;
 697     while(i) {
 698         *p-- = i%10 + '0';
 699         i /= 10;
 700     }
 701
 702     if(neg)
 703         *p = '-';
 704     else
 705         p++;
 706
 707     return jsstr_alloc(p);
 708 }
 709
 710 HRESULT double_to_string(double n, jsstr_t **str)
 711 {
 712     const WCHAR InfinityW[] = {'-','I','n','f','i','n','i','t','y',0};
 713
 714     if(isnan(n)) {
 715         *str = jsstr_nan();
 716     }else if(isinf(n)) {
 717         *str = jsstr_alloc(n<0 ? InfinityW : InfinityW+1);
 718     }else if(is_int32(n)) {
 719         *str = int_to_string(n);
 720     }else {
 721         VARIANT strv, v;
 722         HRESULT hres;
 723
 724         /* FIXME: Don't use VariantChangeTypeEx */
 725         V_VT(&v) = VT_R8;
 726         V_R8(&v) = n;
 727         V_VT(&strv) = VT_EMPTY;
 728         hres = VariantChangeTypeEx(&strv, &v, MAKELCID(MAKELANGID(LANG_ENGLISH,SUBLANG_ENGLISH_US),SORT_DEFAULT), 0, VT_BSTR);
 729         if(FAILED(hres))
 730             return hres;
 731
 732         *str = jsstr_alloc(V_BSTR(&strv));
 733         SysFreeString(V_BSTR(&strv));
 734     }
 735
 736     return *str ? S_OK : E_OUTOFMEMORY;
 737 }
 738
 739 /* ECMA-262 3rd Edition    9.8 */
 740 HRESULT to_string(script_ctx_t *ctx, jsval_t val, jsstr_t **str)
 741 {
 742     const WCHAR nullW[] = {'n','u','l','l',0};
 743     const WCHAR trueW[] = {'t','r','u','e',0};
 744     const WCHAR falseW[] = {'f','a','l','s','e',0};
 745
 746     switch(jsval_type(val)) {
 747     case JSV_UNDEFINED:
 748         *str = jsstr_undefined();
 749         return S_OK;
 750     case JSV_NULL:
 751         *str = jsstr_alloc(nullW);
 752         break;
 753     case JSV_NUMBER:
 754         return double_to_string(get_number(val), str);
 755     case JSV_STRING:
 756         *str = jsstr_addref(get_string(val));
 757         break;
 758     case JSV_OBJECT: {
 759         jsval_t prim;
 760         HRESULT hres;
 761
 762         hres = to_primitive(ctx, val, &prim, HINT_STRING);
 763         if(FAILED(hres))
 764             return hres;
 765
 766         hres = to_string(ctx, prim, str);
 767         jsval_release(prim);
 768         return hres;
 769     }
 770     case JSV_BOOL:
 771         *str = jsstr_alloc(get_bool(val) ? trueW : falseW);
 772         break;
 773     default:
 774         FIXME("unsupported %s\n", debugstr_jsval(val));
 775         return E_NOTIMPL;
 776     }
 777
 778     return *str ? S_OK : E_OUTOFMEMORY;
 779 }
 780
 781 HRESULT to_flat_string(script_ctx_t *ctx, jsval_t val, jsstr_t **str, const WCHAR **ret_str)
 782 {
 783     HRESULT hres;
 784
 785     hres = to_string(ctx, val, str);
 786     if(FAILED(hres))
 787         return hres;
 788
 789     *ret_str = jsstr_flatten(*str);
 790     if(!*ret_str) {
 791         jsstr_release(*str);
 792         return E_OUTOFMEMORY;
 793     }
 794
 795     return S_OK;
 796 }
 797
 798 /* ECMA-262 3rd Edition    9.9 */
 799 HRESULT to_object(script_ctx_t *ctx, jsval_t val, IDispatch **disp)
 800 {
 801     jsdisp_t *dispex;
 802     HRESULT hres;
 803
 804     switch(jsval_type(val)) {
 805     case JSV_STRING:
 806         hres = create_string(ctx, get_string(val), &dispex);
 807         if(FAILED(hres))
 808             return hres;
 809
 810         *disp = to_disp(dispex);
 811         break;
 812     case JSV_NUMBER:
 813         hres = create_number(ctx, get_number(val), &dispex);
 814         if(FAILED(hres))
 815             return hres;
 816
 817         *disp = to_disp(dispex);
 818         break;
 819     case JSV_OBJECT:
 820         if(get_object(val)) {
 821             *disp = get_object(val);
 822             IDispatch_AddRef(*disp);
 823         }else {
 824             jsdisp_t *obj;
 825
 826             hres = create_object(ctx, NULL, &obj);
 827             if(FAILED(hres))
 828                 return hres;
 829
 830             *disp = to_disp(obj);
 831         }
 832         break;
 833     case JSV_BOOL:
 834         hres = create_bool(ctx, get_bool(val), &dispex);
 835         if(FAILED(hres))
 836             return hres;
 837
 838         *disp = to_disp(dispex);
 839         break;
 840     case JSV_UNDEFINED:
 841     case JSV_NULL:
 842         WARN("object expected\n");
 843         return throw_type_error(ctx, JS_E_OBJECT_EXPECTED, NULL);
 844     case JSV_VARIANT:
 845         switch(V_VT(get_variant(val))) {
 846         case VT_ARRAY|VT_VARIANT:
 847             hres = create_vbarray(ctx, V_ARRAY(get_variant(val)), &dispex);
 848             if(FAILED(hres))
 849                 return hres;
 850
 851             *disp = to_disp(dispex);
 852             break;
 853
 854         default:
 855             FIXME("Unsupported %s\n", debugstr_variant(get_variant(val)));
 856             return E_NOTIMPL;
 857         }
 858         break;
 859     }
 860
 861     return S_OK;
 862 }
 863
 864 HRESULT variant_change_type(script_ctx_t *ctx, VARIANT *dst, VARIANT *src, VARTYPE vt)
 865 {
 866     jsval_t val;
 867     HRESULT hres;
 868
 869     clear_ei(ctx);
 870     hres = variant_to_jsval(src, &val);
 871     if(FAILED(hres))
 872         return hres;
 873
 874     switch(vt) {
 875     case VT_I2:
 876     case VT_I4: {
 877         INT i;
 878
 879         hres = to_int32(ctx, val, &i);
 880         if(SUCCEEDED(hres)) {
 881             if(vt == VT_I4)
 882                 V_I4(dst) = i;
 883             else
 884                 V_I2(dst) = i;
 885         }
 886         break;
 887     }
 888     case VT_R8: {
 889         double n;
 890         hres = to_number(ctx, val, &n);
 891         if(SUCCEEDED(hres))
 892             V_R8(dst) = n;
 893         break;
 894     }
 895     case VT_R4: {
 896         double n;
 897
 898         hres = to_number(ctx, val, &n);
 899         if(SUCCEEDED(hres))
 900             V_R4(dst) = n;
 901         break;
 902     }
 903     case VT_BOOL: {
 904         BOOL b;
 905
 906         hres = to_boolean(val, &b);
 907         if(SUCCEEDED(hres))
 908             V_BOOL(dst) = b ? VARIANT_TRUE : VARIANT_FALSE;
 909         break;
 910     }
 911     case VT_BSTR: {
 912         jsstr_t *str;
 913
 914         hres = to_string(ctx, val, &str);
 915         if(FAILED(hres))
 916             break;
 917
 918         if(is_null_bstr(str)) {
 919             V_BSTR(dst) = NULL;
 920             break;
 921         }
 922
 923         V_BSTR(dst) = SysAllocStringLen(NULL, jsstr_length(str));
 924         if(V_BSTR(dst))
 925             jsstr_flush(str, V_BSTR(dst));
 926         else
 927             hres = E_OUTOFMEMORY;
 928         break;
 929     }
 930     case VT_EMPTY:
 931         hres = V_VT(src) == VT_EMPTY ? S_OK : E_NOTIMPL;
 932         break;
 933     case VT_NULL:
 934         hres = V_VT(src) == VT_NULL ? S_OK : E_NOTIMPL;
 935         break;
 936     default:
 937         FIXME("vt %d not implemented\n", vt);
 938         hres = E_NOTIMPL;
 939     }
 940
 941     jsval_release(val);
 942     if(FAILED(hres))
 943         return hres;
 944
 945     V_VT(dst) = vt;
 946     return S_OK;
 947 }
 948
 949 static inline JSCaller *impl_from_IServiceProvider(IServiceProvider *iface)
 950 {
 951     return CONTAINING_RECORD(iface, JSCaller, IServiceProvider_iface);
 952 }
 953
 954 static HRESULT WINAPI JSCaller_QueryInterface(IServiceProvider *iface, REFIID riid, void **ppv)
 955 {
 956     JSCaller *This = impl_from_IServiceProvider(iface);
 957
 958     if(IsEqualGUID(&IID_IUnknown, riid)) {
 959         TRACE("(%p)->(IID_IUnknown %p)\n", This, ppv);
 960         *ppv = &This->IServiceProvider_iface;
 961     }else if(IsEqualGUID(&IID_IServiceProvider, riid)) {
 962         TRACE("(%p)->(IID_IServiceProvider %p)\n", This, ppv);
 963         *ppv = &This->IServiceProvider_iface;
 964     }else {
 965         WARN("(%p)->(%s %p)\n", This, debugstr_guid(riid), ppv);
 966         *ppv = NULL;
 967         return E_NOINTERFACE;
 968     }
 969
 970     IUnknown_AddRef((IUnknown*)*ppv);
 971     return S_OK;
 972 }
 973
 974 static ULONG WINAPI JSCaller_AddRef(IServiceProvider *iface)
 975 {
 976     JSCaller *This = impl_from_IServiceProvider(iface);
 977     LONG ref = InterlockedIncrement(&This->ref);
 978
 979     TRACE("(%p) ref=%d\n", This, ref);
 980
 981     return ref;
 982 }
 983
 984 static ULONG WINAPI JSCaller_Release(IServiceProvider *iface)
 985 {
 986     JSCaller *This = impl_from_IServiceProvider(iface);
 987     LONG ref = InterlockedIncrement(&This->ref);
 988
 989     TRACE("(%p) ref=%d\n", This, ref);
 990
 991     if(!ref) {
 992         assert(!This->ctx);
 993         heap_free(This);
 994     }
 995
 996     return ref;
 997 }
 998
 999 static HRESULT WINAPI JSCaller_QueryService(IServiceProvider *iface, REFGUID guidService,
1000         REFIID riid, void **ppv)
1001 {
1002     JSCaller *This = impl_from_IServiceProvider(iface);
1003
1004     if(IsEqualGUID(guidService, &SID_VariantConversion) && This->ctx && This->ctx->active_script) {
1005         TRACE("(%p)->(SID_VariantConversion)\n", This);
1006         return IActiveScript_QueryInterface(This->ctx->active_script, riid, ppv);
1007     }
1008
1009     FIXME("(%p)->(%s %s %p)\n", This, debugstr_guid(guidService), debugstr_guid(riid), ppv);
1010
1011     *ppv = NULL;
1012     return E_NOINTERFACE;
1013 }
1014
1015 static const IServiceProviderVtbl ServiceProviderVtbl = {
1016     JSCaller_QueryInterface,
1017     JSCaller_AddRef,
1018     JSCaller_Release,
1019     JSCaller_QueryService
1020 };
1021
1022 HRESULT create_jscaller(script_ctx_t *ctx)
1023 {
1024     JSCaller *ret;
1025
1026     ret = heap_alloc(sizeof(*ret));
1027     if(!ret)
1028         return E_OUTOFMEMORY;
1029
1030     ret->IServiceProvider_iface.lpVtbl = &ServiceProviderVtbl;
1031     ret->ref = 1;
1032     ret->ctx = ctx;
1033
1034     ctx->jscaller = ret;
1035     return S_OK;
1036 }