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// Copyright 2020 The Crashpad Authors. All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
#include "base/files/file_path.h"
#include "util/misc/capture_context.h"
namespace crashpad {
//! \brief An interface for notifying the CrashpadClient of NSExceptions.
class ObjcExceptionDelegate {
//! \brief The exception processor detected an exception as it was thrown and
//! captured the cpu context.
//! \param context The cpu context of the thread throwing an exception.
virtual void HandleUncaughtNSExceptionWithContext(
NativeCPUContext* context) = 0;
//! \brief The exception processor did not detect the exception as it was
//! thrown, and instead caught the exception via the
//! NSUncaughtExceptionHandler.
//! \param frames An array of call stack frame addresses.
//! \param num_frames The number of frames in |frames|.
virtual void HandleUncaughtNSException(const uint64_t* frames,
const size_t num_frames) = 0;
//! \brief Generate an intermediate dump from an NSException caught with its
//! associated CPU context. Because the method for intercepting
//! exceptions is imperfect, write the the intermediate dump to a
//! temporary location specified by \a path. If the NSException matches
//! the one used in the UncaughtExceptionHandler, call
//! MoveIntermediateDumpAtPathToPending to move to the proper Crashpad
//! database pending location.
//! \param[in] context The cpu context of the thread throwing an exception.
//! \param[in] path Path to write the intermediate dump.
virtual void HandleUncaughtNSExceptionWithContextAtPath(
NativeCPUContext* context,
const base::FilePath& path) = 0;
//! \brief Moves an intermediate dump to the pending directory. This is meant
//! to be used by the UncaughtExceptionHandler, when the NSException
//! caught by the preprocessor matches the UncaughtExceptionHandler.
//! \param[in] path Path to the specific intermediate dump.
virtual bool MoveIntermediateDumpAtPathToPending(
const base::FilePath& path) = 0;
~ObjcExceptionDelegate() {}
//! \brief Installs the Objective-C exception preprocessor.
//! When code raises an Objective-C exception, unwind the stack looking for
//! any exception handlers. If an exception handler is encountered, test to
//! see if it is a function known to be a catch-and-rethrow 'sinkhole' exception
//! handler. Various routines in UIKit do this, and they obscure the
//! crashing stack, since the original throw location is no longer present
//! on the stack (just the re-throw) when Crashpad captures the crash
//! report. In the case of sinkholes, trigger an immediate exception to
//! capture the original stack.
//! This should be installed at the same time the CrashpadClient installs the
//! signal handler. It should only be installed once.
void InstallObjcExceptionPreprocessor(ObjcExceptionDelegate* delegate);
//! \brief Uninstalls the Objective-C exception preprocessor. Expected to be
//! used by tests only.
void UninstallObjcExceptionPreprocessor();
} // namespace crashpad