| /* |
| * Copyright (C) 2011 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_INSTRUMENTATION_H_ |
| #define ART_RUNTIME_INSTRUMENTATION_H_ |
| |
| #include <stdint.h> |
| |
| #include <functional> |
| #include <list> |
| #include <memory> |
| #include <optional> |
| #include <unordered_set> |
| |
| #include "arch/instruction_set.h" |
| #include "base/enums.h" |
| #include "base/locks.h" |
| #include "base/macros.h" |
| #include "base/safe_map.h" |
| #include "gc_root.h" |
| #include "offsets.h" |
| |
| namespace art { |
| namespace mirror { |
| class Class; |
| class Object; |
| class Throwable; |
| } // namespace mirror |
| class ArtField; |
| class ArtMethod; |
| template <typename T> class Handle; |
| template <typename T> class MutableHandle; |
| struct NthCallerVisitor; |
| union JValue; |
| class SHARED_LOCKABLE ReaderWriterMutex; |
| class ShadowFrame; |
| class Thread; |
| enum class DeoptimizationMethodType; |
| |
| namespace instrumentation { |
| |
| |
| // Do we want to deoptimize for method entry and exit listeners or just try to intercept |
| // invocations? Deoptimization forces all code to run in the interpreter and considerably hurts the |
| // application's performance. |
| static constexpr bool kDeoptimizeForAccurateMethodEntryExitListeners = true; |
| |
| // an optional frame is either Some(const ShadowFrame& current_frame) or None depending on if the |
| // method being exited has a shadow-frame associed with the current stack frame. In cases where |
| // there is no shadow-frame associated with this stack frame this will be None. |
| using OptionalFrame = std::optional<std::reference_wrapper<const ShadowFrame>>; |
| |
| // Instrumentation event listener API. Registered listeners will get the appropriate call back for |
| // the events they are listening for. The call backs supply the thread, method and dex_pc the event |
| // occurred upon. The thread may or may not be Thread::Current(). |
| struct InstrumentationListener { |
| InstrumentationListener() {} |
| virtual ~InstrumentationListener() {} |
| |
| // Call-back for when a method is entered. |
| virtual void MethodEntered(Thread* thread, ArtMethod* method) |
| REQUIRES_SHARED(Locks::mutator_lock_) = 0; |
| |
| virtual void MethodExited(Thread* thread, |
| ArtMethod* method, |
| OptionalFrame frame, |
| MutableHandle<mirror::Object>& return_value) |
| REQUIRES_SHARED(Locks::mutator_lock_); |
| |
| // Call-back for when a method is exited. The implementor should either handler-ize the return |
| // value (if appropriate) or use the alternate MethodExited callback instead if they need to |
| // go through a suspend point. |
| virtual void MethodExited(Thread* thread, |
| ArtMethod* method, |
| OptionalFrame frame, |
| JValue& return_value) |
| REQUIRES_SHARED(Locks::mutator_lock_) = 0; |
| |
| // Call-back for when a method is popped due to an exception throw. A method will either cause a |
| // MethodExited call-back or a MethodUnwind call-back when its activation is removed. |
| virtual void MethodUnwind(Thread* thread, |
| Handle<mirror::Object> this_object, |
| ArtMethod* method, |
| uint32_t dex_pc) |
| REQUIRES_SHARED(Locks::mutator_lock_) = 0; |
| |
| // Call-back for when the dex pc moves in a method. |
| virtual void DexPcMoved(Thread* thread, |
| Handle<mirror::Object> this_object, |
| ArtMethod* method, |
| uint32_t new_dex_pc) |
| REQUIRES_SHARED(Locks::mutator_lock_) = 0; |
| |
| // Call-back for when we read from a field. |
| virtual void FieldRead(Thread* thread, |
| Handle<mirror::Object> this_object, |
| ArtMethod* method, |
| uint32_t dex_pc, |
| ArtField* field) = 0; |
| |
| virtual void FieldWritten(Thread* thread, |
| Handle<mirror::Object> this_object, |
| ArtMethod* method, |
| uint32_t dex_pc, |
| ArtField* field, |
| Handle<mirror::Object> field_value) |
| REQUIRES_SHARED(Locks::mutator_lock_); |
| |
| // Call-back for when we write into a field. |
| virtual void FieldWritten(Thread* thread, |
| Handle<mirror::Object> this_object, |
| ArtMethod* method, |
| uint32_t dex_pc, |
| ArtField* field, |
| const JValue& field_value) |
| REQUIRES_SHARED(Locks::mutator_lock_) = 0; |
| |
| // Call-back when an exception is thrown. |
| virtual void ExceptionThrown(Thread* thread, |
| Handle<mirror::Throwable> exception_object) |
| REQUIRES_SHARED(Locks::mutator_lock_) = 0; |
| |
| // Call-back when an exception is caught/handled by java code. |
| virtual void ExceptionHandled(Thread* thread, Handle<mirror::Throwable> exception_object) |
| REQUIRES_SHARED(Locks::mutator_lock_) = 0; |
| |
| // Call-back for when we execute a branch. |
| virtual void Branch(Thread* thread, |
| ArtMethod* method, |
| uint32_t dex_pc, |
| int32_t dex_pc_offset) |
| REQUIRES_SHARED(Locks::mutator_lock_) = 0; |
| |
| // Call-back when a shadow_frame with the needs_notify_pop_ boolean set is popped off the stack by |
| // either return or exceptions. Normally instrumentation listeners should ensure that there are |
| // shadow-frames by deoptimizing stacks. |
| virtual void WatchedFramePop(Thread* thread ATTRIBUTE_UNUSED, |
| const ShadowFrame& frame ATTRIBUTE_UNUSED) |
| REQUIRES_SHARED(Locks::mutator_lock_) = 0; |
| }; |
| |
| class Instrumentation; |
| // A helper to send instrumentation events while popping the stack in a safe way. |
| class InstrumentationStackPopper { |
| public: |
| explicit InstrumentationStackPopper(Thread* self); |
| ~InstrumentationStackPopper() REQUIRES_SHARED(Locks::mutator_lock_); |
| |
| // Increase the number of frames being popped up to `stack_pointer`. Return true if the |
| // frames were popped without any exceptions, false otherwise. The exception that caused |
| // the pop is 'exception'. |
| bool PopFramesTo(uintptr_t stack_pointer, /*in-out*/MutableHandle<mirror::Throwable>& exception) |
| REQUIRES_SHARED(Locks::mutator_lock_); |
| |
| private: |
| Thread* self_; |
| Instrumentation* instrumentation_; |
| // The stack pointer limit for frames to pop. |
| uintptr_t pop_until_; |
| }; |
| |
| // Instrumentation is a catch-all for when extra information is required from the runtime. The |
| // typical use for instrumentation is for profiling and debugging. Instrumentation may add stubs |
| // to method entry and exit, it may also force execution to be switched to the interpreter and |
| // trigger deoptimization. |
| class Instrumentation { |
| public: |
| enum InstrumentationEvent { |
| kMethodEntered = 0x1, |
| kMethodExited = 0x2, |
| kMethodUnwind = 0x4, |
| kDexPcMoved = 0x8, |
| kFieldRead = 0x10, |
| kFieldWritten = 0x20, |
| kExceptionThrown = 0x40, |
| kBranch = 0x80, |
| kWatchedFramePop = 0x200, |
| kExceptionHandled = 0x400, |
| }; |
| |
| enum class InstrumentationLevel { |
| kInstrumentNothing, // execute without instrumentation |
| kInstrumentWithInstrumentationStubs, // execute with instrumentation entry/exit stubs |
| kInstrumentWithInterpreter // execute with interpreter |
| }; |
| |
| Instrumentation(); |
| |
| static constexpr MemberOffset NeedsEntryExitHooksOffset() { |
| // Assert that instrumentation_stubs_installed_ is 8bits wide. If the size changes |
| // update the compare instructions in the code generator when generating checks for |
| // MethodEntryExitHooks. |
| static_assert(sizeof(instrumentation_stubs_installed_) == 1, |
| "instrumentation_stubs_installed_ isn't expected size"); |
| return MemberOffset(OFFSETOF_MEMBER(Instrumentation, instrumentation_stubs_installed_)); |
| } |
| |
| // Add a listener to be notified of the masked together sent of instrumentation events. This |
| // suspend the runtime to install stubs. You are expected to hold the mutator lock as a proxy |
| // for saying you should have suspended all threads (installing stubs while threads are running |
| // will break). |
| void AddListener(InstrumentationListener* listener, uint32_t events) |
| REQUIRES(Locks::mutator_lock_, !Locks::thread_list_lock_, !Locks::classlinker_classes_lock_); |
| |
| // Removes a listener possibly removing instrumentation stubs. |
| void RemoveListener(InstrumentationListener* listener, uint32_t events) |
| REQUIRES(Locks::mutator_lock_, !Locks::thread_list_lock_, !Locks::classlinker_classes_lock_); |
| |
| // Calls UndeoptimizeEverything which may visit class linker classes through ConfigureStubs. |
| void DisableDeoptimization(const char* key) |
| REQUIRES(Locks::mutator_lock_, Roles::uninterruptible_) |
| REQUIRES(!GetDeoptimizedMethodsLock()); |
| |
| bool AreAllMethodsDeoptimized() const { |
| return InterpreterStubsInstalled(); |
| } |
| bool ShouldNotifyMethodEnterExitEvents() const REQUIRES_SHARED(Locks::mutator_lock_); |
| |
| // Executes everything with interpreter. |
| void DeoptimizeEverything(const char* key) |
| REQUIRES(Locks::mutator_lock_, Roles::uninterruptible_) |
| REQUIRES(!Locks::thread_list_lock_, |
| !Locks::classlinker_classes_lock_, |
| !GetDeoptimizedMethodsLock()); |
| |
| // Executes everything with compiled code (or interpreter if there is no code). May visit class |
| // linker classes through ConfigureStubs. |
| void UndeoptimizeEverything(const char* key) |
| REQUIRES(Locks::mutator_lock_, Roles::uninterruptible_) |
| REQUIRES(!Locks::thread_list_lock_, |
| !Locks::classlinker_classes_lock_, |
| !GetDeoptimizedMethodsLock()); |
| |
| // Deoptimize a method by forcing its execution with the interpreter. Nevertheless, a static |
| // method (except a class initializer) set to the resolution trampoline will be deoptimized only |
| // once its declaring class is initialized. |
| void Deoptimize(ArtMethod* method) |
| REQUIRES(Locks::mutator_lock_, !Locks::thread_list_lock_, !GetDeoptimizedMethodsLock()); |
| |
| // Undeoptimze the method by restoring its entrypoints. Nevertheless, a static method |
| // (except a class initializer) set to the resolution trampoline will be updated only once its |
| // declaring class is initialized. |
| void Undeoptimize(ArtMethod* method) |
| REQUIRES(Locks::mutator_lock_, !Locks::thread_list_lock_, !GetDeoptimizedMethodsLock()); |
| |
| // Indicates whether the method has been deoptimized so it is executed with the interpreter. |
| bool IsDeoptimized(ArtMethod* method) |
| REQUIRES(!GetDeoptimizedMethodsLock()) REQUIRES_SHARED(Locks::mutator_lock_); |
| |
| // Indicates if any method needs to be deoptimized. This is used to avoid walking the stack to |
| // determine if a deoptimization is required. |
| bool IsDeoptimizedMethodsEmpty() const |
| REQUIRES(!GetDeoptimizedMethodsLock()) REQUIRES_SHARED(Locks::mutator_lock_); |
| |
| // Enable method tracing by installing instrumentation entry/exit stubs or interpreter. |
| void EnableMethodTracing(const char* key, |
| bool needs_interpreter = kDeoptimizeForAccurateMethodEntryExitListeners) |
| REQUIRES(Locks::mutator_lock_, Roles::uninterruptible_) |
| REQUIRES(!Locks::thread_list_lock_, |
| !Locks::classlinker_classes_lock_, |
| !GetDeoptimizedMethodsLock()); |
| |
| // Disable method tracing by uninstalling instrumentation entry/exit stubs or interpreter. |
| void DisableMethodTracing(const char* key) |
| REQUIRES(Locks::mutator_lock_, Roles::uninterruptible_) |
| REQUIRES(!Locks::thread_list_lock_, |
| !Locks::classlinker_classes_lock_, |
| !GetDeoptimizedMethodsLock()); |
| |
| |
| void InstrumentQuickAllocEntryPoints() REQUIRES(!Locks::instrument_entrypoints_lock_); |
| void UninstrumentQuickAllocEntryPoints() REQUIRES(!Locks::instrument_entrypoints_lock_); |
| void InstrumentQuickAllocEntryPointsLocked() |
| REQUIRES(Locks::instrument_entrypoints_lock_, !Locks::thread_list_lock_, |
| !Locks::runtime_shutdown_lock_); |
| void UninstrumentQuickAllocEntryPointsLocked() |
| REQUIRES(Locks::instrument_entrypoints_lock_, !Locks::thread_list_lock_, |
| !Locks::runtime_shutdown_lock_); |
| void ResetQuickAllocEntryPoints() REQUIRES(Locks::runtime_shutdown_lock_); |
| |
| // Returns a string representation of the given entry point. |
| static std::string EntryPointString(const void* code); |
| |
| // Initialize the entrypoint of the method .`aot_code` is the AOT code. |
| void InitializeMethodsCode(ArtMethod* method, const void* aot_code) |
| REQUIRES_SHARED(Locks::mutator_lock_); |
| |
| // Update the code of a method respecting any installed stubs. |
| void UpdateMethodsCode(ArtMethod* method, const void* new_code) |
| REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!GetDeoptimizedMethodsLock()); |
| |
| // Update the code of a native method to a JITed stub. |
| void UpdateNativeMethodsCodeToJitCode(ArtMethod* method, const void* new_code) |
| REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!GetDeoptimizedMethodsLock()); |
| |
| // Return the code that we can execute for an invoke including from the JIT. |
| const void* GetCodeForInvoke(ArtMethod* method) REQUIRES_SHARED(Locks::mutator_lock_); |
| |
| // Return the code that we can execute considering the current instrumentation level. |
| // If interpreter stubs are installed return interpreter bridge. If the entry exit stubs |
| // are installed return an instrumentation entry point. Otherwise, return the code that |
| // can be executed including from the JIT. |
| const void* GetMaybeInstrumentedCodeForInvoke(ArtMethod* method) |
| REQUIRES_SHARED(Locks::mutator_lock_); |
| |
| void ForceInterpretOnly() { |
| forced_interpret_only_ = true; |
| } |
| |
| bool EntryExitStubsInstalled() const { |
| return instrumentation_level_ == InstrumentationLevel::kInstrumentWithInstrumentationStubs || |
| instrumentation_level_ == InstrumentationLevel::kInstrumentWithInterpreter; |
| } |
| |
| bool InterpreterStubsInstalled() const { |
| return instrumentation_level_ == InstrumentationLevel::kInstrumentWithInterpreter; |
| } |
| |
| // Called by ArtMethod::Invoke to determine dispatch mechanism. |
| bool InterpretOnly() const { |
| return forced_interpret_only_ || InterpreterStubsInstalled(); |
| } |
| bool InterpretOnly(ArtMethod* method) REQUIRES_SHARED(Locks::mutator_lock_); |
| |
| bool IsForcedInterpretOnly() const { |
| return forced_interpret_only_; |
| } |
| |
| bool AreExitStubsInstalled() const { |
| return instrumentation_stubs_installed_; |
| } |
| |
| bool HasMethodEntryListeners() const REQUIRES_SHARED(Locks::mutator_lock_) { |
| return have_method_entry_listeners_; |
| } |
| |
| bool HasMethodExitListeners() const REQUIRES_SHARED(Locks::mutator_lock_) { |
| return have_method_exit_listeners_; |
| } |
| |
| bool HasMethodUnwindListeners() const REQUIRES_SHARED(Locks::mutator_lock_) { |
| return have_method_unwind_listeners_; |
| } |
| |
| bool HasDexPcListeners() const REQUIRES_SHARED(Locks::mutator_lock_) { |
| return have_dex_pc_listeners_; |
| } |
| |
| bool HasFieldReadListeners() const REQUIRES_SHARED(Locks::mutator_lock_) { |
| return have_field_read_listeners_; |
| } |
| |
| bool HasFieldWriteListeners() const REQUIRES_SHARED(Locks::mutator_lock_) { |
| return have_field_write_listeners_; |
| } |
| |
| bool HasExceptionThrownListeners() const REQUIRES_SHARED(Locks::mutator_lock_) { |
| return have_exception_thrown_listeners_; |
| } |
| |
| bool HasBranchListeners() const REQUIRES_SHARED(Locks::mutator_lock_) { |
| return have_branch_listeners_; |
| } |
| |
| bool HasWatchedFramePopListeners() const REQUIRES_SHARED(Locks::mutator_lock_) { |
| return have_watched_frame_pop_listeners_; |
| } |
| |
| bool HasExceptionHandledListeners() const REQUIRES_SHARED(Locks::mutator_lock_) { |
| return have_exception_handled_listeners_; |
| } |
| |
| bool NeedsSlowInterpreterForListeners() const REQUIRES_SHARED(Locks::mutator_lock_) { |
| return have_field_read_listeners_ || |
| have_field_write_listeners_ || |
| have_watched_frame_pop_listeners_ || |
| have_exception_handled_listeners_; |
| } |
| |
| // Inform listeners that a method has been entered. A dex PC is provided as we may install |
| // listeners into executing code and get method enter events for methods already on the stack. |
| void MethodEnterEvent(Thread* thread, ArtMethod* method) const |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| if (UNLIKELY(HasMethodEntryListeners())) { |
| MethodEnterEventImpl(thread, method); |
| } |
| } |
| |
| // Inform listeners that a method has been exited. |
| template<typename T> |
| void MethodExitEvent(Thread* thread, |
| ArtMethod* method, |
| OptionalFrame frame, |
| T& return_value) const |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| if (UNLIKELY(HasMethodExitListeners())) { |
| MethodExitEventImpl(thread, method, frame, return_value); |
| } |
| } |
| |
| // Inform listeners that a method has been exited due to an exception. |
| void MethodUnwindEvent(Thread* thread, |
| ObjPtr<mirror::Object> this_object, |
| ArtMethod* method, |
| uint32_t dex_pc) const |
| REQUIRES_SHARED(Locks::mutator_lock_); |
| |
| // Inform listeners that the dex pc has moved (only supported by the interpreter). |
| void DexPcMovedEvent(Thread* thread, |
| ObjPtr<mirror::Object> this_object, |
| ArtMethod* method, |
| uint32_t dex_pc) const |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| if (UNLIKELY(HasDexPcListeners())) { |
| DexPcMovedEventImpl(thread, this_object, method, dex_pc); |
| } |
| } |
| |
| // Inform listeners that a branch has been taken (only supported by the interpreter). |
| void Branch(Thread* thread, ArtMethod* method, uint32_t dex_pc, int32_t offset) const |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| if (UNLIKELY(HasBranchListeners())) { |
| BranchImpl(thread, method, dex_pc, offset); |
| } |
| } |
| |
| // Inform listeners that we read a field (only supported by the interpreter). |
| void FieldReadEvent(Thread* thread, |
| ObjPtr<mirror::Object> this_object, |
| ArtMethod* method, |
| uint32_t dex_pc, |
| ArtField* field) const |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| if (UNLIKELY(HasFieldReadListeners())) { |
| FieldReadEventImpl(thread, this_object, method, dex_pc, field); |
| } |
| } |
| |
| // Inform listeners that we write a field (only supported by the interpreter). |
| void FieldWriteEvent(Thread* thread, |
| ObjPtr<mirror::Object> this_object, |
| ArtMethod* method, |
| uint32_t dex_pc, |
| ArtField* field, |
| const JValue& field_value) const |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| if (UNLIKELY(HasFieldWriteListeners())) { |
| FieldWriteEventImpl(thread, this_object, method, dex_pc, field, field_value); |
| } |
| } |
| |
| // Inform listeners that a branch has been taken (only supported by the interpreter). |
| void WatchedFramePopped(Thread* thread, const ShadowFrame& frame) const |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| if (UNLIKELY(HasWatchedFramePopListeners())) { |
| WatchedFramePopImpl(thread, frame); |
| } |
| } |
| |
| // Inform listeners that an exception was thrown. |
| void ExceptionThrownEvent(Thread* thread, ObjPtr<mirror::Throwable> exception_object) const |
| REQUIRES_SHARED(Locks::mutator_lock_); |
| |
| // Inform listeners that an exception has been handled. This is not sent for native code or for |
| // exceptions which reach the end of the thread's stack. |
| void ExceptionHandledEvent(Thread* thread, ObjPtr<mirror::Throwable> exception_object) const |
| REQUIRES_SHARED(Locks::mutator_lock_); |
| |
| JValue GetReturnValue(Thread* self, |
| ArtMethod* method, |
| bool* is_ref, |
| uint64_t* gpr_result, |
| uint64_t* fpr_result) REQUIRES_SHARED(Locks::mutator_lock_); |
| bool ShouldDeoptimizeMethod(Thread* self, const NthCallerVisitor& visitor) |
| REQUIRES_SHARED(Locks::mutator_lock_); |
| |
| // Called when an instrumented method is entered. The intended link register (lr) is saved so |
| // that returning causes a branch to the method exit stub. Generates method enter events. |
| void PushInstrumentationStackFrame(Thread* self, |
| ObjPtr<mirror::Object> this_object, |
| ArtMethod* method, |
| uintptr_t stack_pointer, |
| uintptr_t lr, |
| bool interpreter_entry) |
| REQUIRES_SHARED(Locks::mutator_lock_); |
| |
| DeoptimizationMethodType GetDeoptimizationMethodType(ArtMethod* method) |
| REQUIRES_SHARED(Locks::mutator_lock_); |
| |
| // Called when an instrumented method is exited. Removes the pushed instrumentation frame |
| // returning the intended link register. Generates method exit events. The gpr_result and |
| // fpr_result pointers are pointers to the locations where the integer/pointer and floating point |
| // result values of the function are stored. Both pointers must always be valid but the values |
| // held there will only be meaningful if interpreted as the appropriate type given the function |
| // being returned from. |
| TwoWordReturn PopInstrumentationStackFrame(Thread* self, |
| uintptr_t* return_pc_addr, |
| uint64_t* gpr_result, |
| uint64_t* fpr_result) |
| REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!GetDeoptimizedMethodsLock()); |
| |
| // Pops nframes instrumentation frames from the current thread. Returns the return pc for the last |
| // instrumentation frame that's popped. |
| uintptr_t PopFramesForDeoptimization(Thread* self, uintptr_t stack_pointer) const |
| REQUIRES_SHARED(Locks::mutator_lock_); |
| |
| // Call back for configure stubs. |
| void InstallStubsForClass(ObjPtr<mirror::Class> klass) REQUIRES_SHARED(Locks::mutator_lock_) |
| REQUIRES(!GetDeoptimizedMethodsLock()); |
| |
| void InstallStubsForMethod(ArtMethod* method) |
| REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!GetDeoptimizedMethodsLock()); |
| |
| // Install instrumentation exit stub on every method of the stack of the given thread. |
| // This is used by: |
| // - the debugger to cause a deoptimization of the all frames in thread's stack (for |
| // example, after updating local variables) |
| // - to call method entry / exit hooks for tracing. For this we instrument |
| // the stack frame to run entry / exit hooks but we don't need to deoptimize. |
| // deopt_all_frames indicates whether the frames need to deoptimize or not. |
| void InstrumentThreadStack(Thread* thread, bool deopt_all_frames) REQUIRES(Locks::mutator_lock_); |
| |
| // Force all currently running frames to be deoptimized back to interpreter. This should only be |
| // used in cases where basically all compiled code has been invalidated. |
| void DeoptimizeAllThreadFrames() REQUIRES(art::Locks::mutator_lock_); |
| |
| static size_t ComputeFrameId(Thread* self, |
| size_t frame_depth, |
| size_t inlined_frames_before_frame) |
| REQUIRES_SHARED(Locks::mutator_lock_); |
| |
| // Does not hold lock, used to check if someone changed from not instrumented to instrumented |
| // during a GC suspend point. |
| bool AllocEntrypointsInstrumented() const REQUIRES_SHARED(Locks::mutator_lock_) { |
| return alloc_entrypoints_instrumented_; |
| } |
| |
| InstrumentationLevel GetCurrentInstrumentationLevel() const; |
| |
| private: |
| // Returns true if moving to the given instrumentation level requires the installation of stubs. |
| // False otherwise. |
| bool RequiresInstrumentationInstallation(InstrumentationLevel new_level) const; |
| |
| // Returns true if we need entry exit stub to call entry hooks. JITed code |
| // directly call entry / exit hooks and don't need the stub. |
| static bool CodeNeedsEntryExitStub(const void* code, ArtMethod* method) |
| REQUIRES_SHARED(Locks::mutator_lock_); |
| |
| // Update the current instrumentation_level_. |
| void UpdateInstrumentationLevel(InstrumentationLevel level); |
| |
| // Does the job of installing or removing instrumentation code within methods. |
| // In order to support multiple clients using instrumentation at the same time, |
| // the caller must pass a unique key (a string) identifying it so we remind which |
| // instrumentation level it needs. Therefore the current instrumentation level |
| // becomes the highest instrumentation level required by a client. |
| void ConfigureStubs(const char* key, InstrumentationLevel desired_instrumentation_level) |
| REQUIRES(Locks::mutator_lock_, Roles::uninterruptible_) |
| REQUIRES(!GetDeoptimizedMethodsLock(), |
| !Locks::thread_list_lock_, |
| !Locks::classlinker_classes_lock_); |
| void UpdateStubs() REQUIRES(Locks::mutator_lock_, Roles::uninterruptible_) |
| REQUIRES(!GetDeoptimizedMethodsLock(), |
| !Locks::thread_list_lock_, |
| !Locks::classlinker_classes_lock_); |
| |
| // If there are no pending deoptimizations restores the stack to the normal state by updating the |
| // return pcs to actual return addresses from the instrumentation stack and clears the |
| // instrumentation stack. |
| void MaybeRestoreInstrumentationStack() REQUIRES(Locks::mutator_lock_); |
| |
| // No thread safety analysis to get around SetQuickAllocEntryPointsInstrumented requiring |
| // exclusive access to mutator lock which you can't get if the runtime isn't started. |
| void SetEntrypointsInstrumented(bool instrumented) NO_THREAD_SAFETY_ANALYSIS; |
| |
| void MethodEnterEventImpl(Thread* thread, ArtMethod* method) const |
| REQUIRES_SHARED(Locks::mutator_lock_); |
| template <typename T> |
| void MethodExitEventImpl(Thread* thread, |
| ArtMethod* method, |
| OptionalFrame frame, |
| T& return_value) const |
| REQUIRES_SHARED(Locks::mutator_lock_); |
| void DexPcMovedEventImpl(Thread* thread, |
| ObjPtr<mirror::Object> this_object, |
| ArtMethod* method, |
| uint32_t dex_pc) const |
| REQUIRES_SHARED(Locks::mutator_lock_); |
| void BranchImpl(Thread* thread, ArtMethod* method, uint32_t dex_pc, int32_t offset) const |
| REQUIRES_SHARED(Locks::mutator_lock_); |
| void WatchedFramePopImpl(Thread* thread, const ShadowFrame& frame) const |
| REQUIRES_SHARED(Locks::mutator_lock_); |
| void FieldReadEventImpl(Thread* thread, |
| ObjPtr<mirror::Object> this_object, |
| ArtMethod* method, |
| uint32_t dex_pc, |
| ArtField* field) const |
| REQUIRES_SHARED(Locks::mutator_lock_); |
| void FieldWriteEventImpl(Thread* thread, |
| ObjPtr<mirror::Object> this_object, |
| ArtMethod* method, |
| uint32_t dex_pc, |
| ArtField* field, |
| const JValue& field_value) const |
| REQUIRES_SHARED(Locks::mutator_lock_); |
| |
| // Read barrier-aware utility functions for accessing deoptimized_methods_ |
| bool AddDeoptimizedMethod(ArtMethod* method) |
| REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(GetDeoptimizedMethodsLock()); |
| bool IsDeoptimizedMethod(ArtMethod* method) |
| REQUIRES_SHARED(Locks::mutator_lock_, GetDeoptimizedMethodsLock()); |
| bool RemoveDeoptimizedMethod(ArtMethod* method) |
| REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(GetDeoptimizedMethodsLock()); |
| ArtMethod* BeginDeoptimizedMethod() |
| REQUIRES_SHARED(Locks::mutator_lock_, GetDeoptimizedMethodsLock()); |
| bool IsDeoptimizedMethodsEmptyLocked() const |
| REQUIRES_SHARED(Locks::mutator_lock_, GetDeoptimizedMethodsLock()); |
| void UpdateMethodsCodeImpl(ArtMethod* method, const void* new_code) |
| REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!GetDeoptimizedMethodsLock()); |
| |
| ReaderWriterMutex* GetDeoptimizedMethodsLock() const { |
| return deoptimized_methods_lock_.get(); |
| } |
| |
| // A counter that's incremented every time a DeoptimizeAllFrames. We check each |
| // InstrumentationStackFrames creation id against this number and if they differ we deopt even if |
| // we could otherwise continue running. |
| uint64_t current_force_deopt_id_ GUARDED_BY(Locks::mutator_lock_); |
| |
| // Have we hijacked ArtMethod::code_ so that it calls instrumentation/interpreter code? |
| bool instrumentation_stubs_installed_; |
| |
| // The required level of instrumentation. This could be one of the following values: |
| // kInstrumentNothing: no instrumentation support is needed |
| // kInstrumentWithInstrumentationStubs: needs support to call method entry/exit stubs. |
| // kInstrumentWithInterpreter: only execute with interpreter |
| Instrumentation::InstrumentationLevel instrumentation_level_; |
| |
| // Did the runtime request we only run in the interpreter? ie -Xint mode. |
| bool forced_interpret_only_; |
| |
| // Do we have any listeners for method entry events? Short-cut to avoid taking the |
| // instrumentation_lock_. |
| bool have_method_entry_listeners_ GUARDED_BY(Locks::mutator_lock_); |
| |
| // Do we have any listeners for method exit events? Short-cut to avoid taking the |
| // instrumentation_lock_. |
| bool have_method_exit_listeners_ GUARDED_BY(Locks::mutator_lock_); |
| |
| // Do we have any listeners for method unwind events? Short-cut to avoid taking the |
| // instrumentation_lock_. |
| bool have_method_unwind_listeners_ GUARDED_BY(Locks::mutator_lock_); |
| |
| // Do we have any listeners for dex move events? Short-cut to avoid taking the |
| // instrumentation_lock_. |
| bool have_dex_pc_listeners_ GUARDED_BY(Locks::mutator_lock_); |
| |
| // Do we have any listeners for field read events? Short-cut to avoid taking the |
| // instrumentation_lock_. |
| bool have_field_read_listeners_ GUARDED_BY(Locks::mutator_lock_); |
| |
| // Do we have any listeners for field write events? Short-cut to avoid taking the |
| // instrumentation_lock_. |
| bool have_field_write_listeners_ GUARDED_BY(Locks::mutator_lock_); |
| |
| // Do we have any exception thrown listeners? Short-cut to avoid taking the instrumentation_lock_. |
| bool have_exception_thrown_listeners_ GUARDED_BY(Locks::mutator_lock_); |
| |
| // Do we have any frame pop listeners? Short-cut to avoid taking the instrumentation_lock_. |
| bool have_watched_frame_pop_listeners_ GUARDED_BY(Locks::mutator_lock_); |
| |
| // Do we have any branch listeners? Short-cut to avoid taking the instrumentation_lock_. |
| bool have_branch_listeners_ GUARDED_BY(Locks::mutator_lock_); |
| |
| // Do we have any exception handled listeners? Short-cut to avoid taking the |
| // instrumentation_lock_. |
| bool have_exception_handled_listeners_ GUARDED_BY(Locks::mutator_lock_); |
| |
| // Contains the instrumentation level required by each client of the instrumentation identified |
| // by a string key. |
| using InstrumentationLevelTable = SafeMap<const char*, InstrumentationLevel>; |
| InstrumentationLevelTable requested_instrumentation_levels_ GUARDED_BY(Locks::mutator_lock_); |
| |
| // The event listeners, written to with the mutator_lock_ exclusively held. |
| // Mutators must be able to iterate over these lists concurrently, that is, with listeners being |
| // added or removed while iterating. The modifying thread holds exclusive lock, |
| // so other threads cannot iterate (i.e. read the data of the list) at the same time but they |
| // do keep iterators that need to remain valid. This is the reason these listeners are std::list |
| // and not for example std::vector: the existing storage for a std::list does not move. |
| // Note that mutators cannot make a copy of these lists before iterating, as the instrumentation |
| // listeners can also be deleted concurrently. |
| // As a result, these lists are never trimmed. That's acceptable given the low number of |
| // listeners we have. |
| std::list<InstrumentationListener*> method_entry_listeners_ GUARDED_BY(Locks::mutator_lock_); |
| std::list<InstrumentationListener*> method_exit_listeners_ GUARDED_BY(Locks::mutator_lock_); |
| std::list<InstrumentationListener*> method_unwind_listeners_ GUARDED_BY(Locks::mutator_lock_); |
| std::list<InstrumentationListener*> branch_listeners_ GUARDED_BY(Locks::mutator_lock_); |
| std::list<InstrumentationListener*> dex_pc_listeners_ GUARDED_BY(Locks::mutator_lock_); |
| std::list<InstrumentationListener*> field_read_listeners_ GUARDED_BY(Locks::mutator_lock_); |
| std::list<InstrumentationListener*> field_write_listeners_ GUARDED_BY(Locks::mutator_lock_); |
| std::list<InstrumentationListener*> exception_thrown_listeners_ GUARDED_BY(Locks::mutator_lock_); |
| std::list<InstrumentationListener*> watched_frame_pop_listeners_ GUARDED_BY(Locks::mutator_lock_); |
| std::list<InstrumentationListener*> exception_handled_listeners_ GUARDED_BY(Locks::mutator_lock_); |
| |
| // The set of methods being deoptimized (by the debugger) which must be executed with interpreter |
| // only. |
| mutable std::unique_ptr<ReaderWriterMutex> deoptimized_methods_lock_ BOTTOM_MUTEX_ACQUIRED_AFTER; |
| std::unordered_set<ArtMethod*> deoptimized_methods_ GUARDED_BY(GetDeoptimizedMethodsLock()); |
| |
| // Current interpreter handler table. This is updated each time the thread state flags are |
| // modified. |
| |
| // Greater than 0 if quick alloc entry points instrumented. |
| size_t quick_alloc_entry_points_instrumentation_counter_; |
| |
| // alloc_entrypoints_instrumented_ is only updated with all the threads suspended, this is done |
| // to prevent races with the GC where the GC relies on thread suspension only see |
| // alloc_entrypoints_instrumented_ change during suspend points. |
| bool alloc_entrypoints_instrumented_; |
| |
| friend class InstrumentationTest; // For GetCurrentInstrumentationLevel and ConfigureStubs. |
| friend class InstrumentationStackPopper; // For popping instrumentation frames. |
| friend void InstrumentationInstallStack(Thread*, void*, bool); |
| |
| DISALLOW_COPY_AND_ASSIGN(Instrumentation); |
| }; |
| std::ostream& operator<<(std::ostream& os, Instrumentation::InstrumentationEvent rhs); |
| std::ostream& operator<<(std::ostream& os, Instrumentation::InstrumentationLevel rhs); |
| |
| // An element in the instrumentation side stack maintained in art::Thread. |
| struct InstrumentationStackFrame { |
| InstrumentationStackFrame(mirror::Object* this_object, |
| ArtMethod* method, |
| uintptr_t return_pc, |
| bool interpreter_entry, |
| uint64_t force_deopt_id) |
| : this_object_(this_object), |
| method_(method), |
| return_pc_(return_pc), |
| interpreter_entry_(interpreter_entry), |
| force_deopt_id_(force_deopt_id) { |
| } |
| |
| std::string Dump() const REQUIRES_SHARED(Locks::mutator_lock_); |
| |
| mirror::Object* this_object_; |
| ArtMethod* method_; |
| uintptr_t return_pc_; |
| bool interpreter_entry_; |
| uint64_t force_deopt_id_; |
| }; |
| |
| } // namespace instrumentation |
| } // namespace art |
| |
| #endif // ART_RUNTIME_INSTRUMENTATION_H_ |