1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 18 #ifndef ART_RUNTIME_FAULT_HANDLER_H_ 19 #define ART_RUNTIME_FAULT_HANDLER_H_ 20 21 #include <signal.h> 22 #include <vector> 23 #include <setjmp.h> 24 #include <stdint.h> 25 26 #include "base/mutex.h" // For annotalysis. 27 28 namespace art { 29 30 class ArtMethod; 31 class FaultHandler; 32 33 class FaultManager { 34 public: 35 FaultManager(); 36 ~FaultManager(); 37 38 void Init(); 39 40 // Unclaim signals. 41 void Release(); 42 43 // Unclaim signals and delete registered handlers. 44 void Shutdown(); 45 void EnsureArtActionInFrontOfSignalChain(); 46 47 void HandleFault(int sig, siginfo_t* info, void* context); 48 void HandleNestedSignal(int sig, siginfo_t* info, void* context); 49 50 // Added handlers are owned by the fault handler and will be freed on Shutdown(). 51 void AddHandler(FaultHandler* handler, bool generated_code); 52 void RemoveHandler(FaultHandler* handler); 53 54 // Note that the following two functions are called in the context of a signal handler. 55 // The IsInGeneratedCode() function checks that the mutator lock is held before it 56 // calls GetMethodAndReturnPCAndSP(). 57 // TODO: think about adding lock assertions and fake lock and unlock functions. 58 void GetMethodAndReturnPcAndSp(siginfo_t* siginfo, void* context, ArtMethod** out_method, 59 uintptr_t* out_return_pc, uintptr_t* out_sp) 60 NO_THREAD_SAFETY_ANALYSIS; 61 bool IsInGeneratedCode(siginfo_t* siginfo, void *context, bool check_dex_pc) 62 NO_THREAD_SAFETY_ANALYSIS; 63 64 private: 65 std::vector<FaultHandler*> generated_code_handlers_; 66 std::vector<FaultHandler*> other_handlers_; 67 struct sigaction oldaction_; 68 bool initialized_; 69 DISALLOW_COPY_AND_ASSIGN(FaultManager); 70 }; 71 72 class FaultHandler { 73 public: 74 explicit FaultHandler(FaultManager* manager); ~FaultHandler()75 virtual ~FaultHandler() {} GetFaultManager()76 FaultManager* GetFaultManager() { 77 return manager_; 78 } 79 80 virtual bool Action(int sig, siginfo_t* siginfo, void* context) = 0; 81 82 protected: 83 FaultManager* const manager_; 84 85 private: 86 DISALLOW_COPY_AND_ASSIGN(FaultHandler); 87 }; 88 89 class NullPointerHandler FINAL : public FaultHandler { 90 public: 91 explicit NullPointerHandler(FaultManager* manager); 92 93 bool Action(int sig, siginfo_t* siginfo, void* context) OVERRIDE; 94 95 private: 96 DISALLOW_COPY_AND_ASSIGN(NullPointerHandler); 97 }; 98 99 class SuspensionHandler FINAL : public FaultHandler { 100 public: 101 explicit SuspensionHandler(FaultManager* manager); 102 103 bool Action(int sig, siginfo_t* siginfo, void* context) OVERRIDE; 104 105 private: 106 DISALLOW_COPY_AND_ASSIGN(SuspensionHandler); 107 }; 108 109 class StackOverflowHandler FINAL : public FaultHandler { 110 public: 111 explicit StackOverflowHandler(FaultManager* manager); 112 113 bool Action(int sig, siginfo_t* siginfo, void* context) OVERRIDE; 114 115 private: 116 DISALLOW_COPY_AND_ASSIGN(StackOverflowHandler); 117 }; 118 119 class JavaStackTraceHandler FINAL : public FaultHandler { 120 public: 121 explicit JavaStackTraceHandler(FaultManager* manager); 122 123 bool Action(int sig, siginfo_t* siginfo, void* context) OVERRIDE NO_THREAD_SAFETY_ANALYSIS; 124 125 private: 126 DISALLOW_COPY_AND_ASSIGN(JavaStackTraceHandler); 127 }; 128 129 // Statically allocated so the the signal handler can Get access to it. 130 extern FaultManager fault_manager; 131 132 } // namespace art 133 #endif // ART_RUNTIME_FAULT_HANDLER_H_ 134 135