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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_FRAME_VECTORED_HANDLER_IMPL_H_
#define CHROME_FRAME_VECTORED_HANDLER_IMPL_H_
#include "chrome_frame/vectored_handler.h"
#if defined(_M_IX86)
typedef struct _EXCEPTION_REGISTRATION_RECORD {
struct _EXCEPTION_REGISTRATION_RECORD* Next;
PVOID Handler;
} EXCEPTION_REGISTRATION_RECORD;
#define EXCEPTION_CHAIN_END ((struct _EXCEPTION_REGISTRATION_RECORD*)-1)
#else
#error only x86 is supported for now.
#endif
// VEH handler flags settings.
// These are grabbed from winnt.h for PocketPC.
// Only EXCEPTION_NONCONTINUABLE in defined in "regular" winnt.h
// #define EXCEPTION_NONCONTINUABLE 0x1 // Noncontinuable exception
#define EXCEPTION_UNWINDING 0x2 // Unwind is in progress
#define EXCEPTION_EXIT_UNWIND 0x4 // Exit unwind is in progress
#define EXCEPTION_STACK_INVALID 0x8 // Stack out of limits or unaligned
#define EXCEPTION_NESTED_CALL 0x10 // Nested exception handler call
#define EXCEPTION_TARGET_UNWIND 0x20 // Target unwind in progress
#define EXCEPTION_COLLIDED_UNWIND 0x40 // Collided exception handler call
#define EXCEPTION_UNWIND (EXCEPTION_UNWINDING | EXCEPTION_EXIT_UNWIND | \
EXCEPTION_TARGET_UNWIND | EXCEPTION_COLLIDED_UNWIND)
#define IS_UNWINDING(Flag) (((Flag) & EXCEPTION_UNWIND) != 0)
#define IS_DISPATCHING(Flag) (((Flag) & EXCEPTION_UNWIND) == 0)
#define IS_TARGET_UNWIND(Flag) ((Flag) & EXCEPTION_TARGET_UNWIND)
// End of grabbed section
template <class E>
LONG WINAPI VectoredHandlerT<E>::VectoredHandler(
EXCEPTION_POINTERS* exceptionInfo) {
// TODO(stoyan): Consider reentrancy
const DWORD exceptionCode = exceptionInfo->ExceptionRecord->ExceptionCode;
// Not interested in non-error exceptions. In this category falls exceptions
// like:
// 0x40010006 - OutputDebugStringA. Seen when no debugger is attached
// (otherwise debugger swallows the exception and prints
// the string).
// 0x406D1388 - DebuggerProbe. Used by debug CRT - for example see source
// code of isatty(). Used to name a thread as well.
// RPC_E_DISCONNECTED and Co. - COM IPC non-fatal warnings
// STATUS_BREAKPOINT and Co. - Debugger related breakpoints
if ((exceptionCode & ERROR_SEVERITY_ERROR) != ERROR_SEVERITY_ERROR) {
return ExceptionContinueSearch;
}
++VectoredHandlerT<E>::g_exceptions_seen;
// TODO(stoyan): Check whether exception address is inbetween
// [IsBadReadPtr, IsBadReadPtr + 0xXX]
const DWORD exceptionFlags = exceptionInfo->ExceptionRecord->ExceptionFlags;
// I don't think VEH is called on unwind. Just to be safe.
if (IS_DISPATCHING(exceptionFlags)) {
if (ModuleHasInstalledSEHFilter())
return ExceptionContinueSearch;
if (E::IsOurModule(exceptionInfo->ExceptionRecord->ExceptionAddress)) {
E::WriteDump(exceptionInfo);
return ExceptionContinueSearch;
}
// See whether our module is somewhere in the call stack.
void* back_trace[max_back_trace] = {0};
// Skip RtlCaptureStackBackTrace and VectoredHandler itself.
DWORD captured = E::RtlCaptureStackBackTrace(2, max_back_trace - 2,
&back_trace[0], NULL);
for (DWORD i = 0; i < captured; ++i) {
if (E::IsOurModule(back_trace[i])) {
E::WriteDump(exceptionInfo);
return ExceptionContinueSearch;
}
}
}
return ExceptionContinueSearch;
}
template <class E>
BOOL VectoredHandlerT<E>::ModuleHasInstalledSEHFilter() {
EXCEPTION_REGISTRATION_RECORD* RegistrationFrame = E::RtlpGetExceptionList();
// TODO(stoyan): Add the stack limits check and some sanity checks like
// decreasing addresses of registration records
while (RegistrationFrame != EXCEPTION_CHAIN_END) {
if (E::IsOurModule(RegistrationFrame->Handler)) {
return TRUE;
}
RegistrationFrame = RegistrationFrame->Next;
}
return FALSE;
}
#endif // CHROME_FRAME_VECTORED_HANDLER_IMPL_H_
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