debugger/DebuggerCallFrame.cpp

   1 /*
   2  * Copyright (C) 2008, 2013, 2014 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  *
   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 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 #include "config.h"
  30 #include "DebuggerCallFrame.h"
  31
  32 #include "CodeBlock.h"
  33 #include "Interpreter.h"
  34 #include "JSActivation.h"
  35 #include "JSFunction.h"
  36 #include "JSCInlines.h"
  37 #include "Parser.h"
  38 #include "StackVisitor.h"
  39
  40 namespace JSC {
  41
  42 class LineAndColumnFunctor {
  43 public:
  44     StackVisitor::Status operator()(StackVisitor& visitor)
  45     {
  46         visitor->computeLineAndColumn(m_line, m_column);
  47         return StackVisitor::Done;
  48     }
  49
  50     unsigned line() const { return m_line; }
  51     unsigned column() const { return m_column; }
  52
  53 private:
  54     unsigned m_line;
  55     unsigned m_column;
  56 };
  57
  58 DebuggerCallFrame::DebuggerCallFrame(CallFrame* callFrame)
  59     : m_callFrame(callFrame)
  60 {
  61     m_position = positionForCallFrame(m_callFrame);
  62 }
  63
  64 PassRefPtr<DebuggerCallFrame> DebuggerCallFrame::callerFrame()
  65 {
  66     ASSERT(isValid());
  67     if (!isValid())
  68         return 0;
  69
  70     if (m_caller)
  71         return m_caller;
  72
  73     CallFrame* callerFrame = m_callFrame->callerFrameSkippingVMEntrySentinel();
  74     if (!callerFrame)
  75         return 0;
  76
  77     m_caller = DebuggerCallFrame::create(callerFrame);
  78     return m_caller;
  79 }
  80
  81 JSC::JSGlobalObject* DebuggerCallFrame::vmEntryGlobalObject() const
  82 {
  83     ASSERT(isValid());
  84     if (!isValid())
  85         return 0;
  86     return m_callFrame->vmEntryGlobalObject();
  87 }
  88
  89 SourceID DebuggerCallFrame::sourceID() const
  90 {
  91     ASSERT(isValid());
  92     if (!isValid())
  93         return noSourceID;
  94     return sourceIDForCallFrame(m_callFrame);
  95 }
  96
  97 String DebuggerCallFrame::functionName() const
  98 {
  99     ASSERT(isValid());
 100     if (!isValid())
 101         return String();
 102     JSObject* function = m_callFrame->callee();
 103     if (!function)
 104         return String();
 105
 106     return getCalculatedDisplayName(m_callFrame, function);
 107 }
 108
 109 JSScope* DebuggerCallFrame::scope() const
 110 {
 111     ASSERT(isValid());
 112     if (!isValid())
 113         return 0;
 114
 115     CodeBlock* codeBlock = m_callFrame->codeBlock();
 116     if (codeBlock && codeBlock->needsActivation() && !m_callFrame->hasActivation()) {
 117         JSActivation* activation = JSActivation::create(*codeBlock->vm(), m_callFrame, codeBlock);
 118         m_callFrame->setActivation(activation);
 119         m_callFrame->setScope(activation);
 120     }
 121
 122     return m_callFrame->scope();
 123 }
 124
 125 DebuggerCallFrame::Type DebuggerCallFrame::type() const
 126 {
 127     ASSERT(isValid());
 128     if (!isValid())
 129         return ProgramType;
 130
 131     if (m_callFrame->callee())
 132         return FunctionType;
 133
 134     return ProgramType;
 135 }
 136
 137 JSValue DebuggerCallFrame::thisValue() const
 138 {
 139     ASSERT(isValid());
 140     return thisValueForCallFrame(m_callFrame);
 141 }
 142
 143 // Evaluate some JavaScript code in the scope of this frame.
 144 JSValue DebuggerCallFrame::evaluate(const String& script, JSValue& exception)
 145 {
 146     ASSERT(isValid());
 147     CallFrame* callFrame = m_callFrame;
 148     if (!callFrame)
 149         return jsNull();
 150
 151     JSLockHolder lock(callFrame);
 152
 153     if (!callFrame->codeBlock())
 154         return JSValue();
 155
 156     VM& vm = callFrame->vm();
 157     EvalExecutable* eval = EvalExecutable::create(callFrame, makeSource(script), callFrame->codeBlock()->isStrictMode());
 158     if (vm.exception()) {
 159         exception = vm.exception();
 160         vm.clearException();
 161         return jsUndefined();
 162     }
 163
 164     JSValue thisValue = thisValueForCallFrame(callFrame);
 165     JSValue result = vm.interpreter->execute(eval, callFrame, thisValue, scope());
 166     if (vm.exception()) {
 167         exception = vm.exception();
 168         vm.clearException();
 169     }
 170     ASSERT(result);
 171     return result;
 172 }
 173
 174 void DebuggerCallFrame::invalidate()
 175 {
 176     m_callFrame = nullptr;
 177     RefPtr<DebuggerCallFrame> frame = m_caller.release();
 178     while (frame) {
 179         frame->m_callFrame = nullptr;
 180         frame = frame->m_caller.release();
 181     }
 182 }
 183
 184 TextPosition DebuggerCallFrame::positionForCallFrame(CallFrame* callFrame)
 185 {
 186     if (!callFrame)
 187         return TextPosition();
 188
 189     LineAndColumnFunctor functor;
 190     callFrame->iterate(functor);
 191     return TextPosition(OrdinalNumber::fromOneBasedInt(functor.line()), OrdinalNumber::fromOneBasedInt(functor.column()));
 192 }
 193
 194 SourceID DebuggerCallFrame::sourceIDForCallFrame(CallFrame* callFrame)
 195 {
 196     ASSERT(callFrame);
 197     CodeBlock* codeBlock = callFrame->codeBlock();
 198     if (!codeBlock)
 199         return noSourceID;
 200     return codeBlock->ownerExecutable()->sourceID();
 201 }
 202
 203 JSValue DebuggerCallFrame::thisValueForCallFrame(CallFrame* callFrame)
 204 {
 205     if (!callFrame)
 206         return jsNull();
 207
 208     ECMAMode ecmaMode = NotStrictMode;
 209     CodeBlock* codeBlock = callFrame->codeBlock();
 210     if (codeBlock && codeBlock->isStrictMode())
 211         ecmaMode = StrictMode;
 212     JSValue thisValue = callFrame->thisValue().toThis(callFrame, ecmaMode);
 213     return thisValue;
 214 }
 215
 216 } // namespace JSC