debugger/Debugger.cpp

   1 /*
   2  *  Copyright (C) 2008 Apple Inc. All rights reserved.
   3  *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
   4  *  Copyright (C) 2001 Peter Kelly (pmk@post.com)
   5  *
   6  *  This library is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU Lesser General Public
   8  *  License as published by the Free Software Foundation; either
   9  *  version 2 of the License, or (at your option) any later version.
  10  *
  11  *  This library is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  *  Lesser General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU Lesser General Public
  17  *  License along with this library; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  */
  21
  22 #include "config.h"
  23 #include "Debugger.h"
  24
  25 #include "Error.h"
  26 #include "Interpreter.h"
  27 #include "JSFunction.h"
  28 #include "JSGlobalObject.h"
  29 #include "Parser.h"
  30 #include "Protect.h"
  31
  32 namespace {
  33
  34 using namespace JSC;
  35
  36 class Recompiler {
  37 public:
  38     Recompiler(Debugger*);
  39     ~Recompiler();
  40     void operator()(JSCell*);
  41
  42 private:
  43     typedef HashSet<FunctionExecutable*> FunctionExecutableSet;
  44     typedef HashMap<SourceProvider*, ExecState*> SourceProviderMap;
  45
  46     Debugger* m_debugger;
  47     FunctionExecutableSet m_functionExecutables;
  48     SourceProviderMap m_sourceProviders;
  49 };
  50
  51 inline Recompiler::Recompiler(Debugger* debugger)
  52     : m_debugger(debugger)
  53 {
  54 }
  55
  56 inline Recompiler::~Recompiler()
  57 {
  58     // Call sourceParsed() after reparsing all functions because it will execute
  59     // JavaScript in the inspector.
  60     SourceProviderMap::const_iterator end = m_sourceProviders.end();
  61     for (SourceProviderMap::const_iterator iter = m_sourceProviders.begin(); iter != end; ++iter)
  62         m_debugger->sourceParsed(iter->second, iter->first, -1, UString());
  63 }
  64
  65 inline void Recompiler::operator()(JSCell* cell)
  66 {
  67     if (!cell->inherits(&JSFunction::s_info))
  68         return;
  69
  70     JSFunction* function = asFunction(cell);
  71     if (function->executable()->isHostFunction())
  72         return;
  73
  74     FunctionExecutable* executable = function->jsExecutable();
  75
  76     // Check if the function is already in the set - if so,
  77     // we've already retranslated it, nothing to do here.
  78     if (!m_functionExecutables.add(executable).second)
  79         return;
  80
  81     ExecState* exec = function->scope()->globalObject->JSGlobalObject::globalExec();
  82     executable->discardCode();
  83     if (m_debugger == function->scope()->globalObject->debugger())
  84         m_sourceProviders.add(executable->source().provider(), exec);
  85 }
  86
  87 } // namespace
  88
  89 namespace JSC {
  90
  91 Debugger::~Debugger()
  92 {
  93     HashSet<JSGlobalObject*>::iterator end = m_globalObjects.end();
  94     for (HashSet<JSGlobalObject*>::iterator it = m_globalObjects.begin(); it != end; ++it)
  95         (*it)->setDebugger(0);
  96 }
  97
  98 void Debugger::attach(JSGlobalObject* globalObject)
  99 {
 100     ASSERT(!globalObject->debugger());
 101     globalObject->setDebugger(this);
 102     m_globalObjects.add(globalObject);
 103 }
 104
 105 void Debugger::detach(JSGlobalObject* globalObject)
 106 {
 107     ASSERT(m_globalObjects.contains(globalObject));
 108     m_globalObjects.remove(globalObject);
 109     globalObject->setDebugger(0);
 110 }
 111
 112 void Debugger::recompileAllJSFunctions(JSGlobalData* globalData)
 113 {
 114     // If JavaScript is running, it's not safe to recompile, since we'll end
 115     // up throwing away code that is live on the stack.
 116     ASSERT(!globalData->dynamicGlobalObject);
 117     if (globalData->dynamicGlobalObject)
 118         return;
 119
 120     Recompiler recompiler(this);
 121     globalData->heap.forEach(recompiler);
 122 }
 123
 124 JSValue evaluateInGlobalCallFrame(const UString& script, JSValue& exception, JSGlobalObject* globalObject)
 125 {
 126     CallFrame* globalCallFrame = globalObject->globalExec();
 127     JSGlobalData& globalData = globalObject->globalData();
 128
 129     EvalExecutable* eval = EvalExecutable::create(globalCallFrame, makeSource(script), false);
 130     if (!eval) {
 131         exception = globalData.exception;
 132         globalData.exception = JSValue();
 133         return exception;
 134     }
 135
 136     JSValue result = globalData.interpreter->execute(eval, globalCallFrame, globalObject, globalCallFrame->scopeChain());
 137     if (globalData.exception) {
 138         exception = globalData.exception;
 139         globalData.exception = JSValue();
 140     }
 141     ASSERT(result);
 142     return result;
 143 }
 144
 145 } // namespace JSC