- Revision
- 95243
- Author
- cmar...@apple.com
- Date
- 2011-09-15 16:50:56 -0700 (Thu, 15 Sep 2011)
Log Message
2011-09-15 Chris Marrin <cmar...@apple.com>
Crash can occur when doing a PlatformCAAnimation::copy() with no valueFunction
https://bugs.webkit.org/show_bug.cgi?id=67510
Reviewed by Adam Roben.
Another fix to take care of one last crash when running pause-crash.html.
CACF can't deal with null valueFunctions, so avoid setting it when it doesn't
exist.
This also adds logic to the Windows Hook in LayerChangesFlusher to prevent it
from catching the null pointer exception generated by the pause-crash.html test
before this bug was fixed. Windows was ignoring the exception, so the testcase
would appear to succeed, even though it should have crashed.
* WebCore.vcproj/WebCore.vcproj:
* platform/graphics/ca/win/LayerChangesFlusher.cpp:
(WebCore::LayerChangesFlusher::hookCallback):
* platform/graphics/ca/win/PlatformCAAnimationWin.cpp:
(PlatformCAAnimation::copy):
* platform\win\StructuredExceptionHandlerSupressor.h: New file to encapsulate the exception handling supression.
Modified Paths
Added Paths
Diff
Modified: trunk/Source/WebCore/ChangeLog (95242 => 95243)
--- trunk/Source/WebCore/ChangeLog 2011-09-15 23:45:25 UTC (rev 95242)
+++ trunk/Source/WebCore/ChangeLog 2011-09-15 23:50:56 UTC (rev 95243)
@@ -1,3 +1,26 @@
+2011-09-15 Chris Marrin <cmar...@apple.com>
+
+ Crash can occur when doing a PlatformCAAnimation::copy() with no valueFunction
+ https://bugs.webkit.org/show_bug.cgi?id=67510
+
+ Reviewed by Adam Roben.
+
+ Another fix to take care of one last crash when running pause-crash.html.
+ CACF can't deal with null valueFunctions, so avoid setting it when it doesn't
+ exist.
+
+ This also adds logic to the Windows Hook in LayerChangesFlusher to prevent it
+ from catching the null pointer exception generated by the pause-crash.html test
+ before this bug was fixed. Windows was ignoring the exception, so the testcase
+ would appear to succeed, even though it should have crashed.
+
+ * WebCore.vcproj/WebCore.vcproj:
+ * platform/graphics/ca/win/LayerChangesFlusher.cpp:
+ (WebCore::LayerChangesFlusher::hookCallback):
+ * platform/graphics/ca/win/PlatformCAAnimationWin.cpp:
+ (PlatformCAAnimation::copy):
+ * platform\win\StructuredExceptionHandlerSupressor.h: New file to encapsulate the exception handling supression.
+
2011-09-15 David Hyatt <hy...@apple.com>
https://bugs.webkit.org/show_bug.cgi?id=27579
Modified: trunk/Source/WebCore/WebCore.vcproj/WebCore.vcproj (95242 => 95243)
--- trunk/Source/WebCore/WebCore.vcproj/WebCore.vcproj 2011-09-15 23:45:25 UTC (rev 95242)
+++ trunk/Source/WebCore/WebCore.vcproj/WebCore.vcproj 2011-09-15 23:50:56 UTC (rev 95243)
@@ -27324,6 +27324,10 @@
RelativePath="..\platform\win\SoundWin.cpp"
>
</File>
+ <File
+ RelativePath="..\platform\win\StructuredExceptionHandlerSupressor.h"
+ >
+ </File>
<File
RelativePath="..\platform\win\SystemInfo.cpp"
>
@@ -30174,6 +30178,14 @@
RelativePath="..\platform\graphics\ca\win\LayerChangesFlusher.cpp"
>
<FileConfiguration
+ Name="Debug|Win32"
+ >
+ <Tool
+ Name="VCCLCompilerTool"
+ DisableSpecificWarnings="4733"
+ />
+ </FileConfiguration>
+ <FileConfiguration
Name="Debug_Cairo_CFLite|Win32"
ExcludedFromBuild="true"
>
Modified: trunk/Source/WebCore/platform/graphics/ca/win/LayerChangesFlusher.cpp (95242 => 95243)
--- trunk/Source/WebCore/platform/graphics/ca/win/LayerChangesFlusher.cpp 2011-09-15 23:45:25 UTC (rev 95242)
+++ trunk/Source/WebCore/platform/graphics/ca/win/LayerChangesFlusher.cpp 2011-09-15 23:50:56 UTC (rev 95243)
@@ -29,6 +29,7 @@
#if USE(ACCELERATED_COMPOSITING)
#include "AbstractCACFLayerTreeHost.h"
+#include "StructuredExceptionHandlerSupressor.h"
#include <wtf/StdLibExtras.h>
#include <wtf/Vector.h>
@@ -71,6 +72,10 @@
LRESULT LayerChangesFlusher::hookCallback(int code, WPARAM wParam, LPARAM lParam)
{
+ // Supress the exception handler Windows puts around all hook calls so we can
+ // crash for debugging purposes if an exception is hit.
+ StructuredExceptionHandlerSupressor supressor;
+
return shared().hookFired(code, wParam, lParam);
}
Modified: trunk/Source/WebCore/platform/graphics/ca/win/PlatformCAAnimationWin.cpp (95242 => 95243)
--- trunk/Source/WebCore/platform/graphics/ca/win/PlatformCAAnimationWin.cpp 2011-09-15 23:45:25 UTC (rev 95242)
+++ trunk/Source/WebCore/platform/graphics/ca/win/PlatformCAAnimationWin.cpp 2011-09-15 23:50:56 UTC (rev 95243)
@@ -183,7 +183,8 @@
animation->setRemovedOnCompletion(isRemovedOnCompletion());
animation->setAdditive(isAdditive());
animation->copyTimingFunctionFrom(this);
- animation->setValueFunction(valueFunction());
+ if (valueFunction())
+ animation->setValueFunction(valueFunction());
// Copy the specific Basic or Keyframe values
if (animationType() == Keyframe) {
Added: trunk/Source/WebCore/platform/win/StructuredExceptionHandlerSupressor.h (0 => 95243)
--- trunk/Source/WebCore/platform/win/StructuredExceptionHandlerSupressor.h (rev 0)
+++ trunk/Source/WebCore/platform/win/StructuredExceptionHandlerSupressor.h 2011-09-15 23:50:56 UTC (rev 95243)
@@ -0,0 +1,69 @@
+/*
+ * 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 {
+
+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.
+
+ // 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;
+};
+
+} // namespace WebCore
+
+#endif // StructuredExceptionHandlerSupressor_h
