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         }else {
 331             *r = jsval_disp(NULL);
 332             return S_OK;
 333         }
 334         /* fall through */
 335     default:
 336         return jsval_variant(r, var);
 337     }
 338 }
 339
 340 HRESULT jsval_to_variant(jsval_t val, VARIANT *retv)
 341 {
 342     switch(jsval_type(val)) {
 343     case JSV_UNDEFINED:
 344         V_VT(retv) = VT_EMPTY;
 345         return S_OK;
 346     case JSV_NULL:
 347         V_VT(retv) = VT_NULL;
 348         return S_OK;
 349     case JSV_OBJECT:
 350         V_VT(retv) = VT_DISPATCH;
 351         if(get_object(val))
 352             IDispatch_AddRef(get_object(val));
 353         V_DISPATCH(retv) = get_object(val);
 354         return S_OK;
 355     case JSV_STRING: {
 356         jsstr_t *str = get_string(val);
 357
 358         V_VT(retv) = VT_BSTR;
 359         if(is_null_bstr(str)) {
 360             V_BSTR(retv) = NULL;
 361         }else {
 362             V_BSTR(retv) = SysAllocStringLen(NULL, jsstr_length(str));
 363             if(V_BSTR(retv))
 364                 jsstr_flush(str, V_BSTR(retv));
 365             else
 366                 return E_OUTOFMEMORY;
 367         }
 368         return S_OK;
 369     }
 370     case JSV_NUMBER: {
 371         double n = get_number(val);
 372
 373         if(is_int32(n)) {
 374             V_VT(retv) = VT_I4;
 375             V_I4(retv) = n;
 376         }else {
 377             V_VT(retv) = VT_R8;
 378             V_R8(retv) = n;
 379         }
 380
 381         return S_OK;
 382     }
 383     case JSV_BOOL:
 384         V_VT(retv) = VT_BOOL;
 385         V_BOOL(retv) = get_bool(val) ? VARIANT_TRUE : VARIANT_FALSE;
 386         return S_OK;
 387     case JSV_VARIANT:
 388         V_VT(retv) = VT_EMPTY;
 389         return VariantCopy(retv, get_variant(val));
 390     }
 391
 392     assert(0);
 393     return E_FAIL;
 394 }
 395
 396 /* ECMA-262 3rd Edition    9.1 */
 397 HRESULT to_primitive(script_ctx_t *ctx, jsval_t val, jsval_t *ret, hint_t hint)
 398 {
 399     if(is_object_instance(val)) {
 400         jsdisp_t *jsdisp;
 401         jsval_t prim;
 402         DISPID id;
 403         HRESULT hres;
 404
 405         static const WCHAR toStringW[] = {'t','o','S','t','r','i','n','g',0};
 406         static const WCHAR valueOfW[] = {'v','a','l','u','e','O','f',0};
 407
 408         if(!get_object(val)) {
 409             *ret = jsval_null();
 410             return S_OK;
 411         }
 412
 413         jsdisp = iface_to_jsdisp((IUnknown*)get_object(val));
 414         if(!jsdisp)
 415             return disp_propget(ctx, get_object(val), DISPID_VALUE, ret);
 416
 417         if(hint == NO_HINT)
 418             hint = is_class(jsdisp, JSCLASS_DATE) ? HINT_STRING : HINT_NUMBER;
 419
 420         /* Native implementation doesn't throw TypeErrors, returns strange values */
 421
 422         hres = jsdisp_get_id(jsdisp, hint == HINT_STRING ? toStringW : valueOfW, 0, &id);
 423         if(SUCCEEDED(hres)) {
 424             hres = jsdisp_call(jsdisp, id, DISPATCH_METHOD, 0, NULL, &prim);
 425             if(FAILED(hres)) {
 426                 WARN("call error - forwarding exception\n");
 427                 jsdisp_release(jsdisp);
 428                 return hres;
 429             }else if(!is_object_instance(prim)) {
 430                 jsdisp_release(jsdisp);
 431                 *ret = prim;
 432                 return S_OK;
 433             }else {
 434                 IDispatch_Release(get_object(prim));
 435             }
 436         }
 437
 438         hres = jsdisp_get_id(jsdisp, hint == HINT_STRING ? valueOfW : toStringW, 0, &id);
 439         if(SUCCEEDED(hres)) {
 440             hres = jsdisp_call(jsdisp, id, DISPATCH_METHOD, 0, NULL, &prim);
 441             if(FAILED(hres)) {
 442                 WARN("call error - forwarding exception\n");
 443                 jsdisp_release(jsdisp);
 444                 return hres;
 445             }else if(!is_object_instance(prim)) {
 446                 jsdisp_release(jsdisp);
 447                 *ret = prim;
 448                 return S_OK;
 449             }else {
 450                 IDispatch_Release(get_object(prim));
 451             }
 452         }
 453
 454         jsdisp_release(jsdisp);
 455
 456         WARN("failed\n");
 457         return throw_type_error(ctx, JS_E_TO_PRIMITIVE, NULL);
 458     }
 459
 460     return jsval_copy(val, ret);
 461
 462 }
 463
 464 /* ECMA-262 3rd Edition    9.2 */
 465 HRESULT to_boolean(jsval_t val, BOOL *ret)
 466 {
 467     switch(jsval_type(val)) {
 468     case JSV_UNDEFINED:
 469     case JSV_NULL:
 470         *ret = FALSE;
 471         return S_OK;
 472     case JSV_OBJECT:
 473         *ret = get_object(val) != NULL;
 474         return S_OK;
 475     case JSV_STRING:
 476         *ret = jsstr_length(get_string(val)) != 0;
 477         return S_OK;
 478     case JSV_NUMBER:
 479         *ret = !isnan(get_number(val)) && get_number(val);
 480         return S_OK;
 481     case JSV_BOOL:
 482         *ret = get_bool(val);
 483         return S_OK;
 484     case JSV_VARIANT:
 485         FIXME("unimplemented for variant %s\n", debugstr_variant(get_variant(val)));
 486         return E_NOTIMPL;
 487     }
 488
 489     assert(0);
 490     return E_FAIL;
 491 }
 492
 493 static int hex_to_int(WCHAR c)
 494 {
 495     if('0' <= c && c <= '9')
 496         return c-'0';
 497
 498     if('a' <= c && c <= 'f')
 499         return c-'a'+10;
 500
 501     if('A' <= c && c <= 'F')
 502         return c-'A'+10;
 503
 504     return -1;
 505 }
 506
 507 /* ECMA-262 3rd Edition    9.3.1 */
 508 static HRESULT str_to_number(jsstr_t *str, double *ret)
 509 {
 510     const WCHAR *ptr;
 511     BOOL neg = FALSE;
 512     DOUBLE d = 0.0;
 513
 514     static const WCHAR infinityW[] = {'I','n','f','i','n','i','t','y'};
 515
 516     ptr = jsstr_flatten(str);
 517     if(!ptr)
 518         return E_OUTOFMEMORY;
 519
 520     while(isspaceW(*ptr))
 521         ptr++;
 522
 523     if(*ptr == '-') {
 524         neg = TRUE;
 525         ptr++;
 526     }else if(*ptr == '+') {
 527         ptr++;
 528     }
 529
 530     if(!strncmpW(ptr, infinityW, sizeof(infinityW)/sizeof(WCHAR))) {
 531         ptr += sizeof(infinityW)/sizeof(WCHAR);
 532         while(*ptr && isspaceW(*ptr))
 533             ptr++;
 534
 535         if(*ptr)
 536             *ret = NAN;
 537         else
 538             *ret = neg ? -INFINITY : INFINITY;
 539         return S_OK;
 540     }
 541
 542     if(*ptr == '0' && ptr[1] == 'x') {
 543         DWORD l = 0;
 544
 545         ptr += 2;
 546         while((l = hex_to_int(*ptr)) != -1) {
 547             d = d*16 + l;
 548             ptr++;
 549         }
 550
 551         *ret = d;
 552         return S_OK;
 553     }
 554
 555     while(isdigitW(*ptr))
 556         d = d*10 + (*ptr++ - '0');
 557
 558     if(*ptr == 'e' || *ptr == 'E') {
 559         BOOL eneg = FALSE;
 560         LONG l = 0;
 561
 562         ptr++;
 563         if(*ptr == '-') {
 564             ptr++;
 565             eneg = TRUE;
 566         }else if(*ptr == '+') {
 567             ptr++;
 568         }
 569
 570         while(isdigitW(*ptr))
 571             l = l*10 + (*ptr++ - '0');
 572         if(eneg)
 573             l = -l;
 574
 575         d *= pow(10, l);
 576     }else if(*ptr == '.') {
 577         DOUBLE dec = 0.1;
 578
 579         ptr++;
 580         while(isdigitW(*ptr)) {
 581             d += dec * (*ptr++ - '0');
 582             dec *= 0.1;
 583         }
 584     }
 585
 586     while(isspaceW(*ptr))
 587         ptr++;
 588
 589     if(*ptr) {
 590         *ret = NAN;
 591         return S_OK;
 592     }
 593
 594     if(neg)
 595         d = -d;
 596
 597     *ret = d;
 598     return S_OK;
 599 }
 600
 601 /* ECMA-262 3rd Edition    9.3 */
 602 HRESULT to_number(script_ctx_t *ctx, jsval_t val, double *ret)
 603 {
 604     switch(jsval_type(val)) {
 605     case JSV_UNDEFINED:
 606         *ret = NAN;
 607         return S_OK;
 608     case JSV_NULL:
 609         *ret = 0;
 610         return S_OK;
 611     case JSV_NUMBER:
 612         *ret = get_number(val);
 613         return S_OK;
 614     case JSV_STRING:
 615         return str_to_number(get_string(val), ret);
 616     case JSV_OBJECT: {
 617         jsval_t prim;
 618         HRESULT hres;
 619
 620         hres = to_primitive(ctx, val, &prim, HINT_NUMBER);
 621         if(FAILED(hres))
 622             return hres;
 623
 624         hres = to_number(ctx, prim, ret);
 625         jsval_release(prim);
 626         return hres;
 627     }
 628     case JSV_BOOL:
 629         *ret = get_bool(val) ? 1 : 0;
 630         return S_OK;
 631     case JSV_VARIANT:
 632         FIXME("unimplemented for variant %s\n", debugstr_variant(get_variant(val)));
 633         return E_NOTIMPL;
 634     };
 635
 636     assert(0);
 637     return E_FAIL;
 638 }
 639
 640 /* ECMA-262 3rd Edition    9.4 */
 641 HRESULT to_integer(script_ctx_t *ctx, jsval_t v, double *ret)
 642 {
 643     double n;
 644     HRESULT hres;
 645
 646     hres = to_number(ctx, v, &n);
 647     if(FAILED(hres))
 648         return hres;
 649
 650     if(isnan(n))
 651         *ret = 0;
 652     else
 653         *ret = n >= 0.0 ? floor(n) : -floor(-n);
 654     return S_OK;
 655 }
 656
 657 /* ECMA-262 3rd Edition    9.5 */
 658 HRESULT to_int32(script_ctx_t *ctx, jsval_t v, INT *ret)
 659 {
 660     double n;
 661     HRESULT hres;
 662
 663     hres = to_number(ctx, v, &n);
 664     if(FAILED(hres))
 665         return hres;
 666
 667     *ret = isnan(n) || isinf(n) ? 0 : n;
 668     return S_OK;
 669 }
 670
 671 /* ECMA-262 3rd Edition    9.6 */
 672 HRESULT to_uint32(script_ctx_t *ctx, jsval_t val, DWORD *ret)
 673 {
 674     INT32 n;
 675     HRESULT hres;
 676
 677     hres = to_int32(ctx, val, &n);
 678     if(SUCCEEDED(hres))
 679         *ret = n;
 680     return hres;
 681 }
 682
 683 static jsstr_t *int_to_string(int i)
 684 {
 685     WCHAR buf[12], *p;
 686     BOOL neg = FALSE;
 687
 688     if(!i) {
 689         static const WCHAR zeroW[] = {'0',0};
 690         return jsstr_alloc(zeroW);
 691     }
 692
 693     if(i < 0) {
 694         neg = TRUE;
 695         i = -i;
 696     }
 697
 698     p = buf + sizeof(buf)/sizeof(*buf)-1;
 699     *p-- = 0;
 700     while(i) {
 701         *p-- = i%10 + '0';
 702         i /= 10;
 703     }
 704
 705     if(neg)
 706         *p = '-';
 707     else
 708         p++;
 709
 710     return jsstr_alloc(p);
 711 }
 712
 713 HRESULT double_to_string(double n, jsstr_t **str)
 714 {
 715     const WCHAR InfinityW[] = {'-','I','n','f','i','n','i','t','y',0};
 716
 717     if(isnan(n)) {
 718         *str = jsstr_nan();
 719     }else if(isinf(n)) {
 720         *str = jsstr_alloc(n<0 ? InfinityW : InfinityW+1);
 721     }else if(is_int32(n)) {
 722         *str = int_to_string(n);
 723     }else {
 724         VARIANT strv, v;
 725         HRESULT hres;
 726
 727         /* FIXME: Don't use VariantChangeTypeEx */
 728         V_VT(&v) = VT_R8;
 729         V_R8(&v) = n;
 730         V_VT(&strv) = VT_EMPTY;
 731         hres = VariantChangeTypeEx(&strv, &v, MAKELCID(MAKELANGID(LANG_ENGLISH,SUBLANG_ENGLISH_US),SORT_DEFAULT), 0, VT_BSTR);
 732         if(FAILED(hres))
 733             return hres;
 734
 735         *str = jsstr_alloc(V_BSTR(&strv));
 736         SysFreeString(V_BSTR(&strv));
 737     }
 738
 739     return *str ? S_OK : E_OUTOFMEMORY;
 740 }
 741
 742 /* ECMA-262 3rd Edition    9.8 */
 743 HRESULT to_string(script_ctx_t *ctx, jsval_t val, jsstr_t **str)
 744 {
 745     const WCHAR nullW[] = {'n','u','l','l',0};
 746     const WCHAR trueW[] = {'t','r','u','e',0};
 747     const WCHAR falseW[] = {'f','a','l','s','e',0};
 748
 749     switch(jsval_type(val)) {
 750     case JSV_UNDEFINED:
 751         *str = jsstr_undefined();
 752         return S_OK;
 753     case JSV_NULL:
 754         *str = jsstr_alloc(nullW);
 755         break;
 756     case JSV_NUMBER:
 757         return double_to_string(get_number(val), str);
 758     case JSV_STRING:
 759         *str = jsstr_addref(get_string(val));
 760         break;
 761     case JSV_OBJECT: {
 762         jsval_t prim;
 763         HRESULT hres;
 764
 765         hres = to_primitive(ctx, val, &prim, HINT_STRING);
 766         if(FAILED(hres))
 767             return hres;
 768
 769         hres = to_string(ctx, prim, str);
 770         jsval_release(prim);
 771         return hres;
 772     }
 773     case JSV_BOOL:
 774         *str = jsstr_alloc(get_bool(val) ? trueW : falseW);
 775         break;
 776     default:
 777         FIXME("unsupported %s\n", debugstr_jsval(val));
 778         return E_NOTIMPL;
 779     }
 780
 781     return *str ? S_OK : E_OUTOFMEMORY;
 782 }
 783
 784 HRESULT to_flat_string(script_ctx_t *ctx, jsval_t val, jsstr_t **str, const WCHAR **ret_str)
 785 {
 786     HRESULT hres;
 787
 788     hres = to_string(ctx, val, str);
 789     if(FAILED(hres))
 790         return hres;
 791
 792     *ret_str = jsstr_flatten(*str);
 793     if(!*ret_str) {
 794         jsstr_release(*str);
 795         return E_OUTOFMEMORY;
 796     }
 797
 798     return S_OK;
 799 }
 800
 801 /* ECMA-262 3rd Edition    9.9 */
 802 HRESULT to_object(script_ctx_t *ctx, jsval_t val, IDispatch **disp)
 803 {
 804     jsdisp_t *dispex;
 805     HRESULT hres;
 806
 807     switch(jsval_type(val)) {
 808     case JSV_STRING:
 809         hres = create_string(ctx, get_string(val), &dispex);
 810         if(FAILED(hres))
 811             return hres;
 812
 813         *disp = to_disp(dispex);
 814         break;
 815     case JSV_NUMBER:
 816         hres = create_number(ctx, get_number(val), &dispex);
 817         if(FAILED(hres))
 818             return hres;
 819
 820         *disp = to_disp(dispex);
 821         break;
 822     case JSV_OBJECT:
 823         if(get_object(val)) {
 824             *disp = get_object(val);
 825             IDispatch_AddRef(*disp);
 826         }else {
 827             jsdisp_t *obj;
 828
 829             hres = create_object(ctx, NULL, &obj);
 830             if(FAILED(hres))
 831                 return hres;
 832
 833             *disp = to_disp(obj);
 834         }
 835         break;
 836     case JSV_BOOL:
 837         hres = create_bool(ctx, get_bool(val), &dispex);
 838         if(FAILED(hres))
 839             return hres;
 840
 841         *disp = to_disp(dispex);
 842         break;
 843     case JSV_UNDEFINED:
 844     case JSV_NULL:
 845         WARN("object expected\n");
 846         return throw_type_error(ctx, JS_E_OBJECT_EXPECTED, NULL);
 847     case JSV_VARIANT:
 848         switch(V_VT(get_variant(val))) {
 849         case VT_ARRAY|VT_VARIANT:
 850             hres = create_vbarray(ctx, V_ARRAY(get_variant(val)), &dispex);
 851             if(FAILED(hres))
 852                 return hres;
 853
 854             *disp = to_disp(dispex);
 855             break;
 856
 857         default:
 858             FIXME("Unsupported %s\n", debugstr_variant(get_variant(val)));
 859             return E_NOTIMPL;
 860         }
 861         break;
 862     }
 863
 864     return S_OK;
 865 }
 866
 867 HRESULT variant_change_type(script_ctx_t *ctx, VARIANT *dst, VARIANT *src, VARTYPE vt)
 868 {
 869     jsval_t val;
 870     HRESULT hres;
 871
 872     clear_ei(ctx);
 873     hres = variant_to_jsval(src, &val);
 874     if(FAILED(hres))
 875         return hres;
 876
 877     switch(vt) {
 878     case VT_I2:
 879     case VT_I4: {
 880         INT i;
 881
 882         hres = to_int32(ctx, val, &i);
 883         if(SUCCEEDED(hres)) {
 884             if(vt == VT_I4)
 885                 V_I4(dst) = i;
 886             else
 887                 V_I2(dst) = i;
 888         }
 889         break;
 890     }
 891     case VT_R8: {
 892         double n;
 893         hres = to_number(ctx, val, &n);
 894         if(SUCCEEDED(hres))
 895             V_R8(dst) = n;
 896         break;
 897     }
 898     case VT_R4: {
 899         double n;
 900
 901         hres = to_number(ctx, val, &n);
 902         if(SUCCEEDED(hres))
 903             V_R4(dst) = n;
 904         break;
 905     }
 906     case VT_BOOL: {
 907         BOOL b;
 908
 909         hres = to_boolean(val, &b);
 910         if(SUCCEEDED(hres))
 911             V_BOOL(dst) = b ? VARIANT_TRUE : VARIANT_FALSE;
 912         break;
 913     }
 914     case VT_BSTR: {
 915         jsstr_t *str;
 916
 917         hres = to_string(ctx, val, &str);
 918         if(FAILED(hres))
 919             break;
 920
 921         if(is_null_bstr(str)) {
 922             V_BSTR(dst) = NULL;
 923             break;
 924         }
 925
 926         V_BSTR(dst) = SysAllocStringLen(NULL, jsstr_length(str));
 927         if(V_BSTR(dst))
 928             jsstr_flush(str, V_BSTR(dst));
 929         else
 930             hres = E_OUTOFMEMORY;
 931         break;
 932     }
 933     case VT_EMPTY:
 934         hres = V_VT(src) == VT_EMPTY ? S_OK : E_NOTIMPL;
 935         break;
 936     case VT_NULL:
 937         hres = V_VT(src) == VT_NULL ? S_OK : E_NOTIMPL;
 938         break;
 939     default:
 940         FIXME("vt %d not implemented\n", vt);
 941         hres = E_NOTIMPL;
 942     }
 943
 944     jsval_release(val);
 945     if(FAILED(hres))
 946         return hres;
 947
 948     V_VT(dst) = vt;
 949     return S_OK;
 950 }
 951
 952 static inline JSCaller *impl_from_IServiceProvider(IServiceProvider *iface)
 953 {
 954     return CONTAINING_RECORD(iface, JSCaller, IServiceProvider_iface);
 955 }
 956
 957 static HRESULT WINAPI JSCaller_QueryInterface(IServiceProvider *iface, REFIID riid, void **ppv)
 958 {
 959     JSCaller *This = impl_from_IServiceProvider(iface);
 960
 961     if(IsEqualGUID(&IID_IUnknown, riid)) {
 962         TRACE("(%p)->(IID_IUnknown %p)\n", This, ppv);
 963         *ppv = &This->IServiceProvider_iface;
 964     }else if(IsEqualGUID(&IID_IServiceProvider, riid)) {
 965         TRACE("(%p)->(IID_IServiceProvider %p)\n", This, ppv);
 966         *ppv = &This->IServiceProvider_iface;
 967     }else {
 968         WARN("(%p)->(%s %p)\n", This, debugstr_guid(riid), ppv);
 969         *ppv = NULL;
 970         return E_NOINTERFACE;
 971     }
 972
 973     IUnknown_AddRef((IUnknown*)*ppv);
 974     return S_OK;
 975 }
 976
 977 static ULONG WINAPI JSCaller_AddRef(IServiceProvider *iface)
 978 {
 979     JSCaller *This = impl_from_IServiceProvider(iface);
 980     LONG ref = InterlockedIncrement(&This->ref);
 981
 982     TRACE("(%p) ref=%d\n", This, ref);
 983
 984     return ref;
 985 }
 986
 987 static ULONG WINAPI JSCaller_Release(IServiceProvider *iface)
 988 {
 989     JSCaller *This = impl_from_IServiceProvider(iface);
 990     LONG ref = InterlockedIncrement(&This->ref);
 991
 992     TRACE("(%p) ref=%d\n", This, ref);
 993
 994     if(!ref) {
 995         assert(!This->ctx);
 996         heap_free(This);
 997     }
 998
 999     return ref;
1000 }
1001
1002 static HRESULT WINAPI JSCaller_QueryService(IServiceProvider *iface, REFGUID guidService,
1003         REFIID riid, void **ppv)
1004 {
1005     JSCaller *This = impl_from_IServiceProvider(iface);
1006
1007     if(IsEqualGUID(guidService, &SID_VariantConversion) && This->ctx && This->ctx->active_script) {
1008         TRACE("(%p)->(SID_VariantConversion)\n", This);
1009         return IActiveScript_QueryInterface(This->ctx->active_script, riid, ppv);
1010     }
1011
1012     FIXME("(%p)->(%s %s %p)\n", This, debugstr_guid(guidService), debugstr_guid(riid), ppv);
1013
1014     *ppv = NULL;
1015     return E_NOINTERFACE;
1016 }
1017
1018 static const IServiceProviderVtbl ServiceProviderVtbl = {
1019     JSCaller_QueryInterface,
1020     JSCaller_AddRef,
1021     JSCaller_Release,
1022     JSCaller_QueryService
1023 };
1024
1025 HRESULT create_jscaller(script_ctx_t *ctx)
1026 {
1027     JSCaller *ret;
1028
1029     ret = heap_alloc(sizeof(*ret));
1030     if(!ret)
1031         return E_OUTOFMEMORY;
1032
1033     ret->IServiceProvider_iface.lpVtbl = &ServiceProviderVtbl;
1034     ret->ref = 1;
1035     ret->ctx = ctx;
1036
1037     ctx->jscaller = ret;
1038     return S_OK;
1039 }