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| 1 // Copyright (c) 2009 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2009 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 // | 4 // |
| 5 // A class to make it easy to tag exception propagation boundaries and | 5 // A class to make it easy to tag exception propagation boundaries and |
| 6 // get crash reports of exceptions that pass over same. | 6 // get crash reports of exceptions that pass over same. |
| 7 #include "chrome_frame/exception_barrier.h" | 7 #include "chrome_frame/exception_barrier.h" |
| 8 | 8 |
| 9 enum { | 9 enum { |
| 10 // Flag set by exception handling machinery when unwinding | 10 // Flag set by exception handling machinery when unwinding |
| 11 EH_UNWINDING = 0x00000002 | 11 EH_UNWINDING = 0x00000002 |
| 12 }; | 12 }; |
| 13 | 13 |
| 14 ExceptionBarrier::ExceptionHandler ExceptionBarrier::s_handler_ = NULL; | 14 ExceptionBarrier::ExceptionHandler ExceptionBarrier::s_handler_ = NULL; |
| 15 | 15 |
| 16 // This function must be extern "C" to match up with the SAFESEH | 16 // This function must be extern "C" to match up with the SAFESEH |
| 17 // declaration in our corresponding ASM file | 17 // declaration in our corresponding ASM file |
| 18 extern "C" EXCEPTION_DISPOSITION __cdecl | 18 extern "C" EXCEPTION_DISPOSITION __cdecl |
| 19 ExceptionBarrierHandler(struct _EXCEPTION_RECORD *exception_record, | 19 ExceptionBarrierHandler(struct _EXCEPTION_RECORD* exception_record, |
| 20 void * establisher_frame, | 20 void* establisher_frame, |
| 21 struct _CONTEXT *context, | 21 struct _CONTEXT* context, |
| 22 void * reserved) { | 22 void* reserved) { |
| 23 establisher_frame; // unreferenced formal parameter | 23 establisher_frame; // unreferenced formal parameter |
| 24 reserved; | 24 reserved; |
| 25 if (!(exception_record->ExceptionFlags & EH_UNWINDING)) { | 25 if (!(exception_record->ExceptionFlags & EH_UNWINDING)) { |
| 26 // When the exception is really propagating through us, we'd like to be | 26 // When the exception is really propagating through us, we'd like to be |
| 27 // called before the state of the program has been modified by the stack | 27 // called before the state of the program has been modified by the stack |
| 28 // unwinding. In the absence of an exception handler, the unhandled | 28 // unwinding. In the absence of an exception handler, the unhandled |
| 29 // exception filter gets called between the first chance and the second | 29 // exception filter gets called between the first chance and the second |
| 30 // chance exceptions, so Windows pops either the JIT debugger or WER UI. | 30 // chance exceptions, so Windows pops either the JIT debugger or WER UI. |
| 31 // This is not desirable in most of the cases. | 31 // This is not desirable in most of the cases. |
| 32 ExceptionBarrier::ExceptionHandler handler = ExceptionBarrier::handler(); | 32 ExceptionBarrier::ExceptionHandler handler = ExceptionBarrier::handler(); |
| 33 if (handler) { | 33 if (handler) { |
| 34 EXCEPTION_POINTERS ptrs = { exception_record, context }; | 34 EXCEPTION_POINTERS ptrs = { exception_record, context }; |
| 35 | 35 |
| 36 handler(&ptrs); | 36 handler(&ptrs); |
| 37 } | 37 } |
| 38 } | 38 } |
| 39 | 39 |
| 40 return ExceptionContinueSearch; | 40 return ExceptionContinueSearch; |
| 41 } | 41 } |
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