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1/*
2 * Copyright (C) 2005 Apple Computer, 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 *
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
14 *     its contributors may be used to endorse or promote products derived
15 *     from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#import "WebDataSource.h"
30#import "WebDataSourceInternal.h"
31#import "WebFrameInternal.h"
32#import "WebScriptDebugDelegate.h"
33#import "WebScriptDebugger.h"
34#import "WebViewInternal.h"
35#import <WebCore/Frame.h>
36#import <WebCore/ScriptController.h>
37#import <WebCore/WebScriptObjectPrivate.h>
38#import <WebCore/runtime_root.h>
39#import <debugger/Debugger.h>
40#import <debugger/DebuggerActivation.h>
41#import <debugger/DebuggerCallFrame.h>
42#import <interpreter/CallFrame.h>
43#import <runtime/Completion.h>
44#import <runtime/JSFunction.h>
45#import <runtime/JSGlobalObject.h>
46#import <runtime/JSLock.h>
47
48using namespace JSC;
49using namespace WebCore;
50
51// FIXME: these error strings should be public for future use by WebScriptObject and in WebScriptObject.h
52NSString * const WebScriptErrorDomain = @"WebScriptErrorDomain";
53NSString * const WebScriptErrorDescriptionKey = @"WebScriptErrorDescription";
54NSString * const WebScriptErrorLineNumberKey = @"WebScriptErrorLineNumber";
55
56@interface WebScriptCallFrame (WebScriptDebugDelegateInternal)
57
58- (id)_convertValueToObjcValue:(JSValue)value;
59
60@end
61
62@interface WebScriptCallFramePrivate : NSObject {
63@public
64    WebScriptObject        *globalObject;   // the global object's proxy (not retained)
65    WebScriptCallFrame     *caller;         // previous stack frame
66    DebuggerCallFrame* debuggerCallFrame;
67    WebScriptDebugger* debugger;
68}
69@end
70
71@implementation WebScriptCallFramePrivate
72- (void)dealloc
73{
74    [caller release];
75    delete debuggerCallFrame;
76    [super dealloc];
77}
78@end
79
80// WebScriptCallFrame
81//
82// One of these is created to represent each stack frame.  Additionally, there is a "global"
83// frame to represent the outermost scope.  This global frame is always the last frame in
84// the chain of callers.
85//
86// The delegate can assign a "wrapper" to each frame object so it can relay calls through its
87// own exported interface.  This class is private to WebCore (and the delegate).
88
89@implementation WebScriptCallFrame (WebScriptDebugDelegateInternal)
90
91- (WebScriptCallFrame *)_initWithGlobalObject:(WebScriptObject *)globalObj debugger:(WebScriptDebugger *)debugger caller:(WebScriptCallFrame *)caller debuggerCallFrame:(const DebuggerCallFrame&)debuggerCallFrame
92{
93    if ((self = [super init])) {
94        _private = [[WebScriptCallFramePrivate alloc] init];
95        _private->globalObject = globalObj;
96        _private->caller = [caller retain];
97        _private->debugger = debugger;
98    }
99    return self;
100}
101
102- (void)_setDebuggerCallFrame:(const DebuggerCallFrame&)debuggerCallFrame
103{
104    if (!_private->debuggerCallFrame)
105        _private->debuggerCallFrame = new DebuggerCallFrame(debuggerCallFrame);
106    else
107        *_private->debuggerCallFrame = debuggerCallFrame;
108}
109
110- (void)_clearDebuggerCallFrame
111{
112    delete _private->debuggerCallFrame;
113    _private->debuggerCallFrame = 0;
114}
115
116- (id)_convertValueToObjcValue:(JSValue)value
117{
118    if (!value)
119        return nil;
120
121    WebScriptObject *globalObject = _private->globalObject;
122    if (value == [globalObject _imp])
123        return globalObject;
124
125    Bindings::RootObject* root1 = [globalObject _originRootObject];
126    if (!root1)
127        return nil;
128
129    Bindings::RootObject* root2 = [globalObject _rootObject];
130    if (!root2)
131        return nil;
132
133    return [WebScriptObject _convertValueToObjcValue:value originRootObject:root1 rootObject:root2];
134}
135
136@end
137
138
139
140@implementation WebScriptCallFrame
141
142- (void) dealloc
143{
144    [_userInfo release];
145    [_private release];
146    [super dealloc];
147}
148
149- (void)setUserInfo:(id)userInfo
150{
151    if (userInfo != _userInfo) {
152        [_userInfo release];
153        _userInfo = [userInfo retain];
154    }
155}
156
157- (id)userInfo
158{
159    return _userInfo;
160}
161
162- (WebScriptCallFrame *)caller
163{
164    return _private->caller;
165}
166
167// Returns an array of scope objects (most local first).
168// The properties of each scope object are the variables for that scope.
169// Note that the last entry in the array will _always_ be the global object (windowScriptObject),
170// whose properties are the global variables.
171
172- (NSArray *)scopeChain
173{
174    if (!_private->debuggerCallFrame)
175        return [NSArray array];
176
177    JSLock lock(SilenceAssertionsOnly);
178
179    const ScopeChainNode* scopeChain = _private->debuggerCallFrame->scopeChain();
180    if (!scopeChain->next)  // global frame
181        return [NSArray arrayWithObject:_private->globalObject];
182
183    NSMutableArray *scopes = [[NSMutableArray alloc] init];
184
185    ScopeChainIterator end = scopeChain->end();
186    for (ScopeChainIterator it = scopeChain->begin(); it != end; ++it) {
187        JSObject* object = *it;
188        if (object->isActivationObject())
189            object = new (scopeChain->globalData) DebuggerActivation(object);
190        [scopes addObject:[self _convertValueToObjcValue:object]];
191    }
192
193    NSArray *result = [NSArray arrayWithArray:scopes];
194    [scopes release];
195    return result;
196}
197
198// Returns the name of the function for this frame, if available.
199// Returns nil for anonymous functions and for the global frame.
200
201- (NSString *)functionName
202{
203    if (!_private->debuggerCallFrame)
204        return nil;
205
206    const UString* functionName = _private->debuggerCallFrame->functionName();
207    return functionName ? toNSString(*functionName) : nil;
208}
209
210// Returns the pending exception for this frame (nil if none).
211
212- (id)exception
213{
214    if (!_private->debuggerCallFrame)
215        return nil;
216
217    JSValue exception = _private->debuggerCallFrame->exception();
218    return exception ? [self _convertValueToObjcValue:exception] : nil;
219}
220
221// Evaluate some JavaScript code in the context of this frame.
222// The code is evaluated as if by "eval", and the result is returned.
223// If there is an (uncaught) exception, it is returned as though _it_ were the result.
224// Calling this method on the global frame is not quite the same as calling the WebScriptObject
225// method of the same name, due to the treatment of exceptions.
226
227- (id)evaluateWebScript:(NSString *)script
228{
229    if (!_private->debuggerCallFrame)
230        return nil;
231
232    JSLock lock(SilenceAssertionsOnly);
233
234    // If this is the global call frame and there is no dynamic global object,
235    // Dashcode is attempting to execute JS in the evaluator using a stale
236    // WebScriptCallFrame. Instead, we need to set the dynamic global object
237    // and evaluate the JS in the global object's global call frame.
238    JSGlobalObject* globalObject = _private->debugger->globalObject();
239    if (self == _private->debugger->globalCallFrame() && !globalObject->globalData()->dynamicGlobalObject) {
240        JSGlobalObject* globalObject = _private->debugger->globalObject();
241
242        DynamicGlobalObjectScope globalObjectScope(globalObject->globalExec(), globalObject);
243
244        JSValue exception;
245        JSValue result = evaluateInGlobalCallFrame(String(script), exception, globalObject);
246        if (exception)
247            return [self _convertValueToObjcValue:exception];
248        return result ? [self _convertValueToObjcValue:result] : nil;
249    }
250
251    JSValue exception;
252    JSValue result = _private->debuggerCallFrame->evaluate(String(script), exception);
253    if (exception)
254        return [self _convertValueToObjcValue:exception];
255    return result ? [self _convertValueToObjcValue:result] : nil;
256}
257
258@end
259