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/*
* Copyright (C) 2008 The Android Open Source Project
*
* 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_RUNTIME_FAULT_HANDLER_H_
#define ART_RUNTIME_FAULT_HANDLER_H_
#include <signal.h>
#include <vector>
#include <setjmp.h>
#include <stdint.h>
#include "base/mutex.h" // For annotalysis.
namespace art {
class ArtMethod;
class FaultHandler;
class FaultManager {
public:
FaultManager();
~FaultManager();
void Init();
// Unclaim signals.
void Release();
// Unclaim signals and delete registered handlers.
void Shutdown();
// Try to handle a fault, returns true if successful.
bool HandleFault(int sig, siginfo_t* info, void* context);
// Added handlers are owned by the fault handler and will be freed on Shutdown().
void AddHandler(FaultHandler* handler, bool generated_code);
void RemoveHandler(FaultHandler* handler);
// Note that the following two functions are called in the context of a signal handler.
// The IsInGeneratedCode() function checks that the mutator lock is held before it
// calls GetMethodAndReturnPCAndSP().
// TODO: think about adding lock assertions and fake lock and unlock functions.
void GetMethodAndReturnPcAndSp(siginfo_t* siginfo, void* context, ArtMethod** out_method,
uintptr_t* out_return_pc, uintptr_t* out_sp)
NO_THREAD_SAFETY_ANALYSIS;
bool IsInGeneratedCode(siginfo_t* siginfo, void *context, bool check_dex_pc)
NO_THREAD_SAFETY_ANALYSIS;
private:
// The HandleFaultByOtherHandlers function is only called by HandleFault function for generated code.
bool HandleFaultByOtherHandlers(int sig, siginfo_t* info, void* context)
NO_THREAD_SAFETY_ANALYSIS;
std::vector<FaultHandler*> generated_code_handlers_;
std::vector<FaultHandler*> other_handlers_;
struct sigaction oldaction_;
bool initialized_;
DISALLOW_COPY_AND_ASSIGN(FaultManager);
};
class FaultHandler {
public:
explicit FaultHandler(FaultManager* manager);
virtual ~FaultHandler() {}
FaultManager* GetFaultManager() {
return manager_;
}
virtual bool Action(int sig, siginfo_t* siginfo, void* context) = 0;
protected:
FaultManager* const manager_;
private:
DISALLOW_COPY_AND_ASSIGN(FaultHandler);
};
class NullPointerHandler FINAL : public FaultHandler {
public:
explicit NullPointerHandler(FaultManager* manager);
bool Action(int sig, siginfo_t* siginfo, void* context) OVERRIDE;
static bool IsValidImplicitCheck(siginfo_t* siginfo) {
// Our implicit NPE checks always limit the range to a page.
// Note that the runtime will do more exhaustive checks (that we cannot
// reasonably do in signal processing code) based on the dex instruction
// faulting.
return CanDoImplicitNullCheckOn(reinterpret_cast<uintptr_t>(siginfo->si_addr));
}
private:
DISALLOW_COPY_AND_ASSIGN(NullPointerHandler);
};
class SuspensionHandler FINAL : public FaultHandler {
public:
explicit SuspensionHandler(FaultManager* manager);
bool Action(int sig, siginfo_t* siginfo, void* context) OVERRIDE;
private:
DISALLOW_COPY_AND_ASSIGN(SuspensionHandler);
};
class StackOverflowHandler FINAL : public FaultHandler {
public:
explicit StackOverflowHandler(FaultManager* manager);
bool Action(int sig, siginfo_t* siginfo, void* context) OVERRIDE;
private:
DISALLOW_COPY_AND_ASSIGN(StackOverflowHandler);
};
class JavaStackTraceHandler FINAL : public FaultHandler {
public:
explicit JavaStackTraceHandler(FaultManager* manager);
bool Action(int sig, siginfo_t* siginfo, void* context) OVERRIDE NO_THREAD_SAFETY_ANALYSIS;
private:
DISALLOW_COPY_AND_ASSIGN(JavaStackTraceHandler);
};
// Statically allocated so the the signal handler can Get access to it.
extern FaultManager fault_manager;
} // namespace art
#endif // ART_RUNTIME_FAULT_HANDLER_H_
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