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/*
* Copyright (C) 2011 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef StructuredExceptionHandlerSupressor_h
#define StructuredExceptionHandlerSupressor_h
namespace WebCore {
#pragma warning(push)
#pragma warning(disable: 4733) // Disable "not registered as safe handler" warning
class StructuredExceptionHandlerSupressor {
WTF_MAKE_NONCOPYABLE(StructuredExceptionHandlerSupressor);
public:
StructuredExceptionHandlerSupressor()
{
// Windows puts an __try/__except block around some calls, such as hooks.
// The exception handler then ignores system exceptions like invalid addresses
// and null pointers. This class can be used to remove this block and prevent
// it from catching the exception. Typically this will cause the exception to crash
// which is often desirable to allow crashlogs to be recorded for debugging purposed.
// While this class is in scope we replace the Windows exception handler with 0xffffffff,
// which indicates that the exception should not be handled.
//
// See http://www.microsoft.com/msj/0197/Exception/Exception.aspx
// Windows doesn't like assigning to member variables, so we need to get the value into
// a local variable and store it afterwards.
void* registration;
__asm mov eax, FS:[0]
__asm mov [registration], eax
__asm mov eax, 0xffffffff
__asm mov FS:[0], eax
m_savedExceptionRegistration = registration;
}
~StructuredExceptionHandlerSupressor()
{
// Restore the exception handler
__asm mov eax, [m_savedExceptionRegistration]
__asm mov FS:[0], eax
}
private:
void* m_savedExceptionRegistration;
};
#pragma warning(pop)
} // namespace WebCore
#endif // StructuredExceptionHandlerSupressor_h
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