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1/*
2 * Copyright (C) 2004, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#import "config.h"
27#import "DOMInternal.h"
28
29#import "DOMNodeInternal.h"
30#import "Frame.h"
31#import "JSNode.h"
32#import "WebScriptObjectPrivate.h"
33#import "runtime_root.h"
34
35//------------------------------------------------------------------------------------------
36// Wrapping WebCore implementation objects
37
38static NSMapTable* DOMWrapperCache;
39
40NSMapTable* createWrapperCache()
41{
42#ifdef BUILDING_ON_TIGER
43    return NSCreateMapTable(NSNonOwnedPointerMapKeyCallBacks, NSNonRetainedObjectMapValueCallBacks, 0);
44#else
45    // NSMapTable with zeroing weak pointers is the recommended way to build caches like this under garbage collection.
46    NSPointerFunctionsOptions keyOptions = NSPointerFunctionsOpaqueMemory | NSPointerFunctionsOpaquePersonality;
47    NSPointerFunctionsOptions valueOptions = NSPointerFunctionsZeroingWeakMemory | NSPointerFunctionsObjectPersonality;
48    return [[NSMapTable alloc] initWithKeyOptions:keyOptions valueOptions:valueOptions capacity:0];
49#endif
50}
51
52NSObject* getDOMWrapper(DOMObjectInternal* impl)
53{
54    if (!DOMWrapperCache)
55        return nil;
56    return static_cast<NSObject*>(NSMapGet(DOMWrapperCache, impl));
57}
58
59void addDOMWrapper(NSObject* wrapper, DOMObjectInternal* impl)
60{
61    if (!DOMWrapperCache)
62        DOMWrapperCache = createWrapperCache();
63    NSMapInsert(DOMWrapperCache, impl, wrapper);
64}
65
66void removeDOMWrapper(DOMObjectInternal* impl)
67{
68    if (!DOMWrapperCache)
69        return;
70    NSMapRemove(DOMWrapperCache, impl);
71}
72
73//------------------------------------------------------------------------------------------
74
75@implementation WebScriptObject (WebScriptObjectInternal)
76
77// Only called by DOMObject subclass.
78- (id)_init
79{
80    self = [super init];
81
82    if (![self isKindOfClass:[DOMObject class]]) {
83        [NSException raise:NSGenericException format:@"+%@: _init is an internal initializer", [self class]];
84        return nil;
85    }
86
87    _private = [[WebScriptObjectPrivate alloc] init];
88    _private->isCreatedByDOMWrapper = YES;
89
90    return self;
91}
92
93- (void)_initializeScriptDOMNodeImp
94{
95    ASSERT(_private->isCreatedByDOMWrapper);
96
97    if (![self isKindOfClass:[DOMNode class]]) {
98        // DOMObject can't map back to a document, and thus an interpreter,
99        // so for now only create wrappers for DOMNodes.
100        NSLog(@"%s:%d:  We don't know how to create ObjC JS wrappers from DOMObjects yet.", __FILE__, __LINE__);
101        return;
102    }
103
104    // Extract the WebCore::Node from the ObjectiveC wrapper.
105    DOMNode *n = (DOMNode *)self;
106    WebCore::Node *nodeImpl = core(n);
107
108    // Dig up Interpreter and ExecState.
109    WebCore::Frame *frame = 0;
110    if (WebCore::Document* document = nodeImpl->document())
111        frame = document->frame();
112    if (!frame)
113        return;
114
115    // The global object which should own this node - FIXME: does this need to be isolated-world aware?
116    WebCore::JSDOMGlobalObject* globalObject = frame->script()->globalObject(WebCore::mainThreadNormalWorld());
117    JSC::ExecState *exec = globalObject->globalExec();
118
119    // Get (or create) a cached JS object for the DOM node.
120    JSC::JSObject *scriptImp = asObject(WebCore::toJS(exec, globalObject, nodeImpl));
121
122    JSC::Bindings::RootObject* rootObject = frame->script()->bindingRootObject();
123
124    [self _setImp:scriptImp originRootObject:rootObject rootObject:rootObject];
125}
126
127@end
128