Merge "Refactor exception handling for deoptimization"

1 files changed, 100 insertions, 0 deletions

diff --git a/runtime/quick_exception_handler.h b/runtime/quick_exception_handler.h
new file mode 100644
index 0000000000..d06ce7c632
--- /dev/null
+++ b/runtime/quick_exception_handler.h
@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2014 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_QUICK_EXCEPTION_HANDLER_H_
+#define ART_RUNTIME_QUICK_EXCEPTION_HANDLER_H_
+
+#include "base/logging.h"
+#include "base/mutex.h"
+
+namespace art {
+
+namespace mirror {
+class ArtMethod;
+class Throwable;
+}  // namespace mirror
+class Context;
+class Thread;
+class ThrowLocation;
+class ShadowFrame;
+
+static constexpr bool kDebugExceptionDelivery = false;
+static constexpr size_t kInvalidFrameId = 0xffffffff;
+
+// Manages exception delivery for Quick backend. Not used by Portable backend.
+class QuickExceptionHandler {
+ public:
+  QuickExceptionHandler(Thread* self, bool is_deoptimization)
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+
+  ~QuickExceptionHandler() {
+    LOG(FATAL) << "UNREACHABLE";  // Expected to take long jump.
+  }
+
+  void FindCatch(const ThrowLocation& throw_location, mirror::Throwable* exception)
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+  void DeoptimizeStack() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+  void UpdateInstrumentationStack() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+  void DoLongJump() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+
+  void SetHandlerQuickFrame(mirror::ArtMethod** handler_quick_frame) {
+    handler_quick_frame_ = handler_quick_frame;
+  }
+
+  void SetHandlerQuickFramePc(uintptr_t handler_quick_frame_pc) {
+    handler_quick_frame_pc_ = handler_quick_frame_pc;
+  }
+
+  void SetHandlerDexPc(uint32_t dex_pc) {
+    handler_dex_pc_ = dex_pc;
+  }
+
+  void SetClearException(bool clear_exception) {
+    clear_exception_ = clear_exception;
+  }
+
+  void SetTopShadowFrame(ShadowFrame* top_shadow_frame) {
+    top_shadow_frame_ = top_shadow_frame;
+  }
+
+  void SetHandlerFrameId(size_t frame_id) {
+    handler_frame_id_ = frame_id;
+  }
+
+ private:
+  Thread* const self_;
+  Context* const context_;
+  const bool is_deoptimization_;
+  // Is method tracing active?
+  const bool method_tracing_active_;
+  // Quick frame with found handler or last frame if no handler found.
+  mirror::ArtMethod** handler_quick_frame_;
+  // PC to branch to for the handler.
+  uintptr_t handler_quick_frame_pc_;
+  // Associated dex PC.
+  uint32_t handler_dex_pc_;
+  // Should the exception be cleared as the catch block has no move-exception?
+  bool clear_exception_;
+  // Deoptimization top shadow frame.
+  ShadowFrame* top_shadow_frame_;
+  // Frame id of the catch handler or the upcall.
+  size_t handler_frame_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(QuickExceptionHandler);
+};
+
+}  // namespace art
+#endif  // ART_RUNTIME_QUICK_EXCEPTION_HANDLER_H_