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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
52NSMapTable* createWrapperCacheWithIntegerKeys()
53{
54#ifdef BUILDING_ON_TIGER
55    return NSCreateMapTable(NSIntMapKeyCallBacks, NSNonRetainedObjectMapValueCallBacks, 0);
56#else
57    // NSMapTable with zeroing weak pointers is the recommended way to build caches like this under garbage collection.
58    NSPointerFunctionsOptions keyOptions = NSPointerFunctionsOpaqueMemory | NSPointerFunctionsIntegerPersonality;
59    NSPointerFunctionsOptions valueOptions = NSPointerFunctionsZeroingWeakMemory | NSPointerFunctionsObjectPersonality;
60    return [[NSMapTable alloc] initWithKeyOptions:keyOptions valueOptions:valueOptions capacity:0];
61#endif
62}
63
64NSObject* getDOMWrapper(DOMObjectInternal* impl)
65{
66    if (!DOMWrapperCache)
67        return nil;
68    return static_cast<NSObject*>(NSMapGet(DOMWrapperCache, impl));
69}
70
71void addDOMWrapper(NSObject* wrapper, DOMObjectInternal* impl)
72{
73    if (!DOMWrapperCache)
74        DOMWrapperCache = createWrapperCache();
75    NSMapInsert(DOMWrapperCache, impl, wrapper);
76}
77
78void removeDOMWrapper(DOMObjectInternal* impl)
79{
80    if (!DOMWrapperCache)
81        return;
82    NSMapRemove(DOMWrapperCache, impl);
83}
84
85//------------------------------------------------------------------------------------------
86
87@implementation WebScriptObject (WebScriptObjectInternal)
88
89// Only called by DOMObject subclass.
90- (id)_init
91{
92    self = [super init];
93
94    if (![self isKindOfClass:[DOMObject class]]) {
95        [NSException raise:NSGenericException format:@"+%@: _init is an internal initializer", [self class]];
96        return nil;
97    }
98
99    _private = [[WebScriptObjectPrivate alloc] init];
100    _private->isCreatedByDOMWrapper = YES;
101
102    return self;
103}
104
105- (void)_initializeScriptDOMNodeImp
106{
107    ASSERT(_private->isCreatedByDOMWrapper);
108
109    if (![self isKindOfClass:[DOMNode class]]) {
110        // DOMObject can't map back to a document, and thus an interpreter,
111        // so for now only create wrappers for DOMNodes.
112        NSLog(@"%s:%d:  We don't know how to create ObjC JS wrappers from DOMObjects yet.", __FILE__, __LINE__);
113        return;
114    }
115
116    // Extract the WebCore::Node from the ObjectiveC wrapper.
117    DOMNode *n = (DOMNode *)self;
118    WebCore::Node *nodeImpl = core(n);
119
120    // Dig up Interpreter and ExecState.
121    WebCore::Frame *frame = 0;
122    if (WebCore::Document* document = nodeImpl->document())
123        frame = document->frame();
124    if (!frame)
125        return;
126
127    // The global object which should own this node.
128    WebCore::JSDOMGlobalObject* globalObject = frame->script()->globalObject();
129    JSC::ExecState *exec = globalObject->globalExec();
130
131    // Get (or create) a cached JS object for the DOM node.
132    JSC::JSObject *scriptImp = asObject(WebCore::toJS(exec, globalObject, nodeImpl));
133
134    JSC::Bindings::RootObject* rootObject = frame->script()->bindingRootObject();
135
136    [self _setImp:scriptImp originRootObject:rootObject rootObject:rootObject];
137}
138
139@end
140