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     case VT_UNKNOWN:
 319         if(V_UNKNOWN(var)) {
 320             IDispatch *disp;
 321             HRESULT hres;
 322
 323             hres = IUnknown_QueryInterface(V_UNKNOWN(var), &IID_IDispatch, (void**)&disp);
 324             if(SUCCEEDED(hres)) {
 325                 *r = jsval_disp(disp);
 326                 return S_OK;
 327             }
 328         }
 329         /* fall through */
 330     default:
 331         return jsval_variant(r, var);
 332     }
 333 }
 334
 335 HRESULT jsval_to_variant(jsval_t val, VARIANT *retv)
 336 {
 337     switch(jsval_type(val)) {
 338     case JSV_UNDEFINED:
 339         V_VT(retv) = VT_EMPTY;
 340         return S_OK;
 341     case JSV_NULL:
 342         V_VT(retv) = VT_NULL;
 343         return S_OK;
 344     case JSV_OBJECT:
 345         V_VT(retv) = VT_DISPATCH;
 346         if(get_object(val))
 347             IDispatch_AddRef(get_object(val));
 348         V_DISPATCH(retv) = get_object(val);
 349         return S_OK;
 350     case JSV_STRING: {
 351         jsstr_t *str = get_string(val);
 352
 353         V_VT(retv) = VT_BSTR;
 354         if(str->length_flags & JSSTR_FLAG_NULLBSTR) {
 355             V_BSTR(retv) = NULL;
 356         }else {
 357             V_BSTR(retv) = SysAllocStringLen(str->str, jsstr_length(str));
 358             if(!V_BSTR(retv))
 359                 return E_OUTOFMEMORY;
 360         }
 361         return S_OK;
 362     }
 363     case JSV_NUMBER: {
 364         double n = get_number(val);
 365
 366         if(is_int32(n)) {
 367             V_VT(retv) = VT_I4;
 368             V_I4(retv) = n;
 369         }else {
 370             V_VT(retv) = VT_R8;
 371             V_R8(retv) = n;
 372         }
 373
 374         return S_OK;
 375     }
 376     case JSV_BOOL:
 377         V_VT(retv) = VT_BOOL;
 378         V_BOOL(retv) = get_bool(val) ? VARIANT_TRUE : VARIANT_FALSE;
 379         return S_OK;
 380     case JSV_VARIANT:
 381         V_VT(retv) = VT_EMPTY;
 382         return VariantCopy(retv, get_variant(val));
 383     }
 384
 385     assert(0);
 386     return E_FAIL;
 387 }
 388
 389 /* ECMA-262 3rd Edition    9.1 */
 390 HRESULT to_primitive(script_ctx_t *ctx, jsval_t val, jsval_t *ret, hint_t hint)
 391 {
 392     if(is_object_instance(val)) {
 393         jsdisp_t *jsdisp;
 394         jsval_t prim;
 395         DISPID id;
 396         HRESULT hres;
 397
 398         static const WCHAR toStringW[] = {'t','o','S','t','r','i','n','g',0};
 399         static const WCHAR valueOfW[] = {'v','a','l','u','e','O','f',0};
 400
 401         if(!get_object(val)) {
 402             *ret = jsval_null();
 403             return S_OK;
 404         }
 405
 406         jsdisp = iface_to_jsdisp((IUnknown*)get_object(val));
 407         if(!jsdisp)
 408             return disp_propget(ctx, get_object(val), DISPID_VALUE, ret);
 409
 410         if(hint == NO_HINT)
 411             hint = is_class(jsdisp, JSCLASS_DATE) ? HINT_STRING : HINT_NUMBER;
 412
 413         /* Native implementation doesn't throw TypeErrors, returns strange values */
 414
 415         hres = jsdisp_get_id(jsdisp, hint == HINT_STRING ? toStringW : valueOfW, 0, &id);
 416         if(SUCCEEDED(hres)) {
 417             hres = jsdisp_call(jsdisp, id, DISPATCH_METHOD, 0, NULL, &prim);
 418             if(FAILED(hres)) {
 419                 WARN("call error - forwarding exception\n");
 420                 jsdisp_release(jsdisp);
 421                 return hres;
 422             }else if(!is_object_instance(prim)) {
 423                 jsdisp_release(jsdisp);
 424                 *ret = prim;
 425                 return S_OK;
 426             }else {
 427                 IDispatch_Release(get_object(prim));
 428             }
 429         }
 430
 431         hres = jsdisp_get_id(jsdisp, hint == HINT_STRING ? valueOfW : toStringW, 0, &id);
 432         if(SUCCEEDED(hres)) {
 433             hres = jsdisp_call(jsdisp, id, DISPATCH_METHOD, 0, NULL, &prim);
 434             if(FAILED(hres)) {
 435                 WARN("call error - forwarding exception\n");
 436                 jsdisp_release(jsdisp);
 437                 return hres;
 438             }else if(!is_object_instance(prim)) {
 439                 jsdisp_release(jsdisp);
 440                 *ret = prim;
 441                 return S_OK;
 442             }else {
 443                 IDispatch_Release(get_object(prim));
 444             }
 445         }
 446
 447         jsdisp_release(jsdisp);
 448
 449         WARN("failed\n");
 450         return throw_type_error(ctx, JS_E_TO_PRIMITIVE, NULL);
 451     }
 452
 453     return jsval_copy(val, ret);
 454
 455 }
 456
 457 /* ECMA-262 3rd Edition    9.2 */
 458 HRESULT to_boolean(jsval_t val, BOOL *ret)
 459 {
 460     switch(jsval_type(val)) {
 461     case JSV_UNDEFINED:
 462     case JSV_NULL:
 463         *ret = FALSE;
 464         return S_OK;
 465     case JSV_OBJECT:
 466         *ret = get_object(val) != NULL;
 467         return S_OK;
 468     case JSV_STRING:
 469         *ret = jsstr_length(get_string(val)) != 0;
 470         return S_OK;
 471     case JSV_NUMBER:
 472         *ret = !isnan(get_number(val)) && get_number(val);
 473         return S_OK;
 474     case JSV_BOOL:
 475         *ret = get_bool(val);
 476         return S_OK;
 477     case JSV_VARIANT:
 478         FIXME("unimplemented for variant %s\n", debugstr_variant(get_variant(val)));
 479         return E_NOTIMPL;
 480     }
 481
 482     assert(0);
 483     return E_FAIL;
 484 }
 485
 486 static int hex_to_int(WCHAR c)
 487 {
 488     if('0' <= c && c <= '9')
 489         return c-'0';
 490
 491     if('a' <= c && c <= 'f')
 492         return c-'a'+10;
 493
 494     if('A' <= c && c <= 'F')
 495         return c-'A'+10;
 496
 497     return -1;
 498 }
 499
 500 /* ECMA-262 3rd Edition    9.3.1 */
 501 static HRESULT str_to_number(jsstr_t *str, double *ret)
 502 {
 503     const WCHAR *ptr = str->str;
 504     BOOL neg = FALSE;
 505     DOUBLE d = 0.0;
 506
 507     static const WCHAR infinityW[] = {'I','n','f','i','n','i','t','y'};
 508
 509     if(!ptr) {
 510         *ret = 0;
 511         return S_OK;
 512     }
 513
 514     while(isspaceW(*ptr))
 515         ptr++;
 516
 517     if(*ptr == '-') {
 518         neg = TRUE;
 519         ptr++;
 520     }else if(*ptr == '+') {
 521         ptr++;
 522     }
 523
 524     if(!strncmpW(ptr, infinityW, sizeof(infinityW)/sizeof(WCHAR))) {
 525         ptr += sizeof(infinityW)/sizeof(WCHAR);
 526         while(*ptr && isspaceW(*ptr))
 527             ptr++;
 528
 529         if(*ptr)
 530             *ret = NAN;
 531         else
 532             *ret = neg ? -INFINITY : INFINITY;
 533         return S_OK;
 534     }
 535
 536     if(*ptr == '0' && ptr[1] == 'x') {
 537         DWORD l = 0;
 538
 539         ptr += 2;
 540         while((l = hex_to_int(*ptr)) != -1) {
 541             d = d*16 + l;
 542             ptr++;
 543         }
 544
 545         *ret = d;
 546         return S_OK;
 547     }
 548
 549     while(isdigitW(*ptr))
 550         d = d*10 + (*ptr++ - '0');
 551
 552     if(*ptr == 'e' || *ptr == 'E') {
 553         BOOL eneg = FALSE;
 554         LONG l = 0;
 555
 556         ptr++;
 557         if(*ptr == '-') {
 558             ptr++;
 559             eneg = TRUE;
 560         }else if(*ptr == '+') {
 561             ptr++;
 562         }
 563
 564         while(isdigitW(*ptr))
 565             l = l*10 + (*ptr++ - '0');
 566         if(eneg)
 567             l = -l;
 568
 569         d *= pow(10, l);
 570     }else if(*ptr == '.') {
 571         DOUBLE dec = 0.1;
 572
 573         ptr++;
 574         while(isdigitW(*ptr)) {
 575             d += dec * (*ptr++ - '0');
 576             dec *= 0.1;
 577         }
 578     }
 579
 580     while(isspaceW(*ptr))
 581         ptr++;
 582
 583     if(*ptr) {
 584         *ret = NAN;
 585         return S_OK;
 586     }
 587
 588     if(neg)
 589         d = -d;
 590
 591     *ret = d;
 592     return S_OK;
 593 }
 594
 595 /* ECMA-262 3rd Edition    9.3 */
 596 HRESULT to_number(script_ctx_t *ctx, jsval_t val, double *ret)
 597 {
 598     switch(jsval_type(val)) {
 599     case JSV_UNDEFINED:
 600         *ret = NAN;
 601         return S_OK;
 602     case JSV_NULL:
 603         *ret = 0;
 604         return S_OK;
 605     case JSV_NUMBER:
 606         *ret = get_number(val);
 607         return S_OK;
 608     case JSV_STRING:
 609         return str_to_number(get_string(val), ret);
 610     case JSV_OBJECT: {
 611         jsval_t prim;
 612         HRESULT hres;
 613
 614         hres = to_primitive(ctx, val, &prim, HINT_NUMBER);
 615         if(FAILED(hres))
 616             return hres;
 617
 618         hres = to_number(ctx, prim, ret);
 619         jsval_release(prim);
 620         return hres;
 621     }
 622     case JSV_BOOL:
 623         *ret = get_bool(val) ? 1 : 0;
 624         return S_OK;
 625     case JSV_VARIANT:
 626         FIXME("unimplemented for variant %s\n", debugstr_variant(get_variant(val)));
 627         return E_NOTIMPL;
 628     };
 629
 630     assert(0);
 631     return E_FAIL;
 632 }
 633
 634 /* ECMA-262 3rd Edition    9.4 */
 635 HRESULT to_integer(script_ctx_t *ctx, jsval_t v, double *ret)
 636 {
 637     double n;
 638     HRESULT hres;
 639
 640     hres = to_number(ctx, v, &n);
 641     if(FAILED(hres))
 642         return hres;
 643
 644     if(isnan(n))
 645         *ret = 0;
 646     else
 647         *ret = n >= 0.0 ? floor(n) : -floor(-n);
 648     return S_OK;
 649 }
 650
 651 /* ECMA-262 3rd Edition    9.5 */
 652 HRESULT to_int32(script_ctx_t *ctx, jsval_t v, INT *ret)
 653 {
 654     double n;
 655     HRESULT hres;
 656
 657     hres = to_number(ctx, v, &n);
 658     if(FAILED(hres))
 659         return hres;
 660
 661     *ret = isnan(n) || isinf(n) ? 0 : n;
 662     return S_OK;
 663 }
 664
 665 /* ECMA-262 3rd Edition    9.6 */
 666 HRESULT to_uint32(script_ctx_t *ctx, jsval_t val, DWORD *ret)
 667 {
 668     double n;
 669     HRESULT hres;
 670
 671     hres = to_number(ctx, val, &n);
 672     if(FAILED(hres))
 673         return hres;
 674
 675     *ret = isnan(n) || isinf(n) ? 0 : n;
 676     return S_OK;
 677 }
 678
 679 static jsstr_t *int_to_string(int i)
 680 {
 681     WCHAR buf[12], *p;
 682     BOOL neg = FALSE;
 683
 684     if(!i) {
 685         static const WCHAR zeroW[] = {'0',0};
 686         return jsstr_alloc(zeroW);
 687     }
 688
 689     if(i < 0) {
 690         neg = TRUE;
 691         i = -i;
 692     }
 693
 694     p = buf + sizeof(buf)/sizeof(*buf)-1;
 695     *p-- = 0;
 696     while(i) {
 697         *p-- = i%10 + '0';
 698         i /= 10;
 699     }
 700
 701     if(neg)
 702         *p = '-';
 703     else
 704         p++;
 705
 706     return jsstr_alloc(p);
 707 }
 708
 709 HRESULT double_to_string(double n, jsstr_t **str)
 710 {
 711     const WCHAR InfinityW[] = {'-','I','n','f','i','n','i','t','y',0};
 712
 713     if(isnan(n)) {
 714         *str = jsstr_nan();
 715     }else if(isinf(n)) {
 716         *str = jsstr_alloc(n<0 ? InfinityW : InfinityW+1);
 717     }else if(is_int32(n)) {
 718         *str = int_to_string(n);
 719     }else {
 720         VARIANT strv, v;
 721         HRESULT hres;
 722
 723         /* FIXME: Don't use VariantChangeTypeEx */
 724         V_VT(&v) = VT_R8;
 725         V_R8(&v) = n;
 726         V_VT(&strv) = VT_EMPTY;
 727         hres = VariantChangeTypeEx(&strv, &v, MAKELCID(MAKELANGID(LANG_ENGLISH,SUBLANG_ENGLISH_US),SORT_DEFAULT), 0, VT_BSTR);
 728         if(FAILED(hres))
 729             return hres;
 730
 731         *str = jsstr_alloc(V_BSTR(&strv));
 732         SysFreeString(V_BSTR(&strv));
 733     }
 734
 735     return *str ? S_OK : E_OUTOFMEMORY;
 736 }
 737
 738 /* ECMA-262 3rd Edition    9.8 */
 739 HRESULT to_string(script_ctx_t *ctx, jsval_t val, jsstr_t **str)
 740 {
 741     const WCHAR undefinedW[] = {'u','n','d','e','f','i','n','e','d',0};
 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_alloc(undefinedW);
 749         break;
 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 /* ECMA-262 3rd Edition    9.9 */
 782 HRESULT to_object(script_ctx_t *ctx, jsval_t val, IDispatch **disp)
 783 {
 784     jsdisp_t *dispex;
 785     HRESULT hres;
 786
 787     switch(jsval_type(val)) {
 788     case JSV_STRING:
 789         hres = create_string(ctx, get_string(val), &dispex);
 790         if(FAILED(hres))
 791             return hres;
 792
 793         *disp = to_disp(dispex);
 794         break;
 795     case JSV_NUMBER:
 796         hres = create_number(ctx, get_number(val), &dispex);
 797         if(FAILED(hres))
 798             return hres;
 799
 800         *disp = to_disp(dispex);
 801         break;
 802     case JSV_OBJECT:
 803         if(get_object(val)) {
 804             *disp = get_object(val);
 805             IDispatch_AddRef(*disp);
 806         }else {
 807             jsdisp_t *obj;
 808
 809             hres = create_object(ctx, NULL, &obj);
 810             if(FAILED(hres))
 811                 return hres;
 812
 813             *disp = to_disp(obj);
 814         }
 815         break;
 816     case JSV_BOOL:
 817         hres = create_bool(ctx, get_bool(val), &dispex);
 818         if(FAILED(hres))
 819             return hres;
 820
 821         *disp = to_disp(dispex);
 822         break;
 823     case JSV_UNDEFINED:
 824     case JSV_NULL:
 825         WARN("object expected\n");
 826         return throw_type_error(ctx, JS_E_OBJECT_EXPECTED, NULL);
 827     case JSV_VARIANT:
 828         switch(V_VT(get_variant(val))) {
 829         case VT_ARRAY|VT_VARIANT:
 830             hres = create_vbarray(ctx, V_ARRAY(get_variant(val)), &dispex);
 831             if(FAILED(hres))
 832                 return hres;
 833
 834             *disp = to_disp(dispex);
 835             break;
 836
 837         default:
 838             FIXME("Unsupported %s\n", debugstr_variant(get_variant(val)));
 839             return E_NOTIMPL;
 840         }
 841         break;
 842     }
 843
 844     return S_OK;
 845 }
 846
 847 HRESULT variant_change_type(script_ctx_t *ctx, VARIANT *dst, VARIANT *src, VARTYPE vt)
 848 {
 849     jsval_t val;
 850     HRESULT hres;
 851
 852     clear_ei(ctx);
 853     hres = variant_to_jsval(src, &val);
 854     if(FAILED(hres))
 855         return hres;
 856
 857     switch(vt) {
 858     case VT_I2:
 859     case VT_I4: {
 860         INT i;
 861
 862         hres = to_int32(ctx, val, &i);
 863         if(SUCCEEDED(hres)) {
 864             if(vt == VT_I4)
 865                 V_I4(dst) = i;
 866             else
 867                 V_I2(dst) = i;
 868         }
 869         break;
 870     }
 871     case VT_R8: {
 872         double n;
 873         hres = to_number(ctx, val, &n);
 874         if(SUCCEEDED(hres))
 875             V_R8(dst) = n;
 876         break;
 877     }
 878     case VT_R4: {
 879         double n;
 880
 881         hres = to_number(ctx, val, &n);
 882         if(SUCCEEDED(hres))
 883             V_R4(dst) = n;
 884         break;
 885     }
 886     case VT_BOOL: {
 887         BOOL b;
 888
 889         hres = to_boolean(val, &b);
 890         if(SUCCEEDED(hres))
 891             V_BOOL(dst) = b ? VARIANT_TRUE : VARIANT_FALSE;
 892         break;
 893     }
 894     case VT_BSTR: {
 895         jsstr_t *str;
 896
 897         hres = to_string(ctx, val, &str);
 898         if(FAILED(hres))
 899             break;
 900
 901         if(str->length_flags & JSSTR_FLAG_NULLBSTR) {
 902             V_BSTR(dst) = NULL;
 903             break;
 904         }
 905
 906         V_BSTR(dst) = SysAllocStringLen(str->str, jsstr_length(str));
 907         if(!V_BSTR(dst))
 908             hres = E_OUTOFMEMORY;
 909         break;
 910     }
 911     case VT_EMPTY:
 912         hres = V_VT(src) == VT_EMPTY ? S_OK : E_NOTIMPL;
 913         break;
 914     case VT_NULL:
 915         hres = V_VT(src) == VT_NULL ? S_OK : E_NOTIMPL;
 916         break;
 917     default:
 918         FIXME("vt %d not implemented\n", vt);
 919         hres = E_NOTIMPL;
 920     }
 921
 922     jsval_release(val);
 923     if(FAILED(hres))
 924         return hres;
 925
 926     V_VT(dst) = vt;
 927     return S_OK;
 928 }
 929
 930 static inline JSCaller *impl_from_IServiceProvider(IServiceProvider *iface)
 931 {
 932     return CONTAINING_RECORD(iface, JSCaller, IServiceProvider_iface);
 933 }
 934
 935 static HRESULT WINAPI JSCaller_QueryInterface(IServiceProvider *iface, REFIID riid, void **ppv)
 936 {
 937     JSCaller *This = impl_from_IServiceProvider(iface);
 938
 939     if(IsEqualGUID(&IID_IUnknown, riid)) {
 940         TRACE("(%p)->(IID_IUnknown %p)\n", This, ppv);
 941         *ppv = &This->IServiceProvider_iface;
 942     }else if(IsEqualGUID(&IID_IServiceProvider, riid)) {
 943         TRACE("(%p)->(IID_IServiceProvider %p)\n", This, ppv);
 944         *ppv = &This->IServiceProvider_iface;
 945     }else {
 946         WARN("(%p)->(%s %p)\n", This, debugstr_guid(riid), ppv);
 947         *ppv = NULL;
 948         return E_NOINTERFACE;
 949     }
 950
 951     IUnknown_AddRef((IUnknown*)*ppv);
 952     return S_OK;
 953 }
 954
 955 static ULONG WINAPI JSCaller_AddRef(IServiceProvider *iface)
 956 {
 957     JSCaller *This = impl_from_IServiceProvider(iface);
 958     LONG ref = InterlockedIncrement(&This->ref);
 959
 960     TRACE("(%p) ref=%d\n", This, ref);
 961
 962     return ref;
 963 }
 964
 965 static ULONG WINAPI JSCaller_Release(IServiceProvider *iface)
 966 {
 967     JSCaller *This = impl_from_IServiceProvider(iface);
 968     LONG ref = InterlockedIncrement(&This->ref);
 969
 970     TRACE("(%p) ref=%d\n", This, ref);
 971
 972     if(!ref) {
 973         assert(!This->ctx);
 974         heap_free(This);
 975     }
 976
 977     return ref;
 978 }
 979
 980 static HRESULT WINAPI JSCaller_QueryService(IServiceProvider *iface, REFGUID guidService,
 981         REFIID riid, void **ppv)
 982 {
 983     JSCaller *This = impl_from_IServiceProvider(iface);
 984
 985     if(IsEqualGUID(guidService, &SID_VariantConversion) && This->ctx && This->ctx->active_script) {
 986         TRACE("(%p)->(SID_VariantConversion)\n", This);
 987         return IActiveScript_QueryInterface(This->ctx->active_script, riid, ppv);
 988     }
 989
 990     FIXME("(%p)->(%s %s %p)\n", This, debugstr_guid(guidService), debugstr_guid(riid), ppv);
 991
 992     *ppv = NULL;
 993     return E_NOINTERFACE;
 994 }
 995
 996 static const IServiceProviderVtbl ServiceProviderVtbl = {
 997     JSCaller_QueryInterface,
 998     JSCaller_AddRef,
 999     JSCaller_Release,
1000     JSCaller_QueryService
1001 };
1002
1003 HRESULT create_jscaller(script_ctx_t *ctx)
1004 {
1005     JSCaller *ret;
1006
1007     ret = heap_alloc(sizeof(*ret));
1008     if(!ret)
1009         return E_OUTOFMEMORY;
1010
1011     ret->IServiceProvider_iface.lpVtbl = &ServiceProviderVtbl;
1012     ret->ref = 1;
1013     ret->ctx = ctx;
1014
1015     ctx->jscaller = ret;
1016     return S_OK;
1017 }