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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2001 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2004-2016 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#pragma once
#include "ContainerNode.h"
#include "RuntimeApplicationChecks.h"
#include <wtf/MainThread.h>
#if PLATFORM(IOS_FAMILY)
#include "WebCoreThread.h"
#endif
namespace WebCore {
class ScriptDisallowedScope {
public:
// This variant is expensive. Use ScriptDisallowedScope::InMainThread whenever possible.
ScriptDisallowedScope()
{
if (!isMainThread())
return;
++s_count;
}
ScriptDisallowedScope(const ScriptDisallowedScope&)
: ScriptDisallowedScope()
{
}
~ScriptDisallowedScope()
{
if (!isMainThread())
return;
ASSERT(s_count);
s_count--;
}
ScriptDisallowedScope& operator=(const ScriptDisallowedScope&)
{
return *this;
}
static bool isScriptAllowedInMainThread()
{
return !isInWebProcess() || !isMainThread() || !s_count;
}
class InMainThread {
public:
InMainThread()
{
ASSERT(isMainThread());
++s_count;
}
~InMainThread()
{
ASSERT(isMainThread());
ASSERT(s_count);
--s_count;
}
// Don't enable this assertion in release since it's O(n).
// Release asserts in canExecuteScript should be sufficient for security defense purposes.
static bool isEventDispatchAllowedInSubtree(Node& node)
{
#if ASSERT_ENABLED || ENABLE(SECURITY_ASSERTIONS)
return !isInWebProcess() || isScriptAllowed() || EventAllowedScope::isAllowedNode(node);
#else
UNUSED_PARAM(node);
return true;
#endif
}
static bool hasDisallowedScope()
{
ASSERT(isMainThread());
return s_count;
}
static bool isScriptAllowed()
{
ASSERT(isMainThread());
#if PLATFORM(IOS_FAMILY)
return !s_count || webThreadDelegateMessageScopeCount;
#else
return !s_count;
#endif
}
};
class InMainThreadOfWebProcess {
public:
InMainThreadOfWebProcess()
: m_isInWebProcess(isInWebProcess())
{
ASSERT(isMainThread());
if (!m_isInWebProcess)
return;
++s_count;
}
~InMainThreadOfWebProcess()
{
ASSERT(isMainThread());
if (!m_isInWebProcess)
return;
ASSERT(s_count);
--s_count;
}
private:
bool m_isInWebProcess;
};
#if ASSERT_ENABLED
class EventAllowedScope {
public:
explicit EventAllowedScope(ContainerNode& userAgentContentRoot)
: m_eventAllowedTreeRoot(userAgentContentRoot)
, m_previousScope(s_currentScope)
{
s_currentScope = this;
}
~EventAllowedScope()
{
s_currentScope = m_previousScope;
}
static bool isAllowedNode(Node& node)
{
return s_currentScope && s_currentScope->isAllowedNodeInternal(node);
}
private:
bool isAllowedNodeInternal(Node& node)
{
return m_eventAllowedTreeRoot->contains(&node) || (m_previousScope && m_previousScope->isAllowedNodeInternal(node));
}
Ref<ContainerNode> m_eventAllowedTreeRoot;
EventAllowedScope* m_previousScope;
static EventAllowedScope* s_currentScope;
};
#else // not ASSERT_ENABLED
class EventAllowedScope {
public:
explicit EventAllowedScope(ContainerNode&) { }
static bool isAllowedNode(Node&) { return true; }
};
#endif // not ASSERT_ENABLED
// FIXME: Remove this class once the sync layout inside SVGImage::draw is removed,
// CachedSVGFont::ensureCustomFontData no longer synchronously creates a document during style resolution,
// and refactored the code in RenderFrameBase::performLayoutWithFlattening.
class DisableAssertionsInScope {
public:
DisableAssertionsInScope()
{
ASSERT(isMainThread());
std::swap(s_count, m_originalCount);
}
~DisableAssertionsInScope()
{
s_count = m_originalCount;
}
private:
unsigned m_originalCount { 0 };
};
private:
WEBCORE_EXPORT static unsigned s_count;
};
} // namespace WebCore
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