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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.
//
// A class to make it easy to tag exception propagation boundaries and
// get crash reports of exceptions that pass over same.
#include "chrome_frame/exception_barrier.h"
#include "chrome_frame/crash_reporting/vectored_handler-impl.h"
#include "chrome_frame/crash_reporting/crash_report.h"
enum {
// Flag set by exception handling machinery when unwinding
EH_UNWINDING = 0x00000002
};
bool ExceptionBarrierConfig::s_enabled_ = false;
ExceptionBarrierCustomHandler::CustomExceptionHandler
ExceptionBarrierCustomHandler::s_custom_handler_ = NULL;
// This function must be extern "C" to match up with the SAFESEH
// declaration in our corresponding ASM file
extern "C" EXCEPTION_DISPOSITION __cdecl
ExceptionBarrierHandler(struct _EXCEPTION_RECORD* exception_record,
void* establisher_frame,
struct _CONTEXT* context,
void* reserved) {
// When the exception is really propagating through us, we'd like to be
// called before the state of the program has been modified by the stack
// unwinding. In the absence of an exception handler, the unhandled
// exception filter gets called between the first chance and the second
// chance exceptions, so Windows pops either the JIT debugger or WER UI.
// This is not desirable in most of the cases.
EXCEPTION_POINTERS ptrs = { exception_record, context };
if (ExceptionBarrierConfig::enabled() &&
IS_DISPATCHING(exception_record->ExceptionFlags)) {
WriteMinidumpForException(&ptrs);
}
return ExceptionContinueSearch;
}
extern "C" EXCEPTION_DISPOSITION __cdecl
ExceptionBarrierReportOnlyModuleHandler(
struct _EXCEPTION_RECORD* exception_record,
void* establisher_frame,
struct _CONTEXT* context,
void* reserved) {
EXCEPTION_POINTERS ptrs = { exception_record, context };
if (ExceptionBarrierConfig::enabled() &&
IS_DISPATCHING(exception_record->ExceptionFlags)) {
CrashHandlerTraits traits;
traits.Init(0, 0, &WriteMinidumpForException);
if (traits.IsOurModule(exception_record->ExceptionAddress)) {
traits.WriteDump(&ptrs);
}
}
return ExceptionContinueSearch;
}
extern "C" EXCEPTION_DISPOSITION __cdecl
ExceptionBarrierCallCustomHandler(struct _EXCEPTION_RECORD* exception_record,
void* establisher_frame,
struct _CONTEXT* context,
void* reserved) {
if (ExceptionBarrierConfig::enabled() &&
IS_DISPATCHING(exception_record->ExceptionFlags)) {
ExceptionBarrierCustomHandler::CustomExceptionHandler handler =
ExceptionBarrierCustomHandler::custom_handler();
if (handler) {
EXCEPTION_POINTERS ptrs = { exception_record, context };
handler(&ptrs);
}
}
return ExceptionContinueSearch;
}
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