1 /* 2 * Copyright (C) 2011 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 #ifndef ART_RUNTIME_JAVA_FRAME_ROOT_INFO_H_ 18 #define ART_RUNTIME_JAVA_FRAME_ROOT_INFO_H_ 19 20 #include <iosfwd> 21 #include <limits> 22 23 #include "base/locks.h" 24 #include "base/macros.h" 25 #include "gc_root.h" 26 27 namespace art { 28 29 class StackVisitor; 30 31 class JavaFrameRootInfo final : public RootInfo { 32 public: 33 static_assert(std::numeric_limits<size_t>::max() > std::numeric_limits<uint16_t>::max(), 34 "No extra space in vreg to store meta-data"); 35 // Unable to determine what register number the root is from. 36 static constexpr size_t kUnknownVreg = -1; 37 // The register number for the root might be determinable but we did not attempt to find that 38 // information. 39 static constexpr size_t kImpreciseVreg = -2; 40 // The root is from the declaring class of the current method. 41 static constexpr size_t kMethodDeclaringClass = -3; 42 // The root is from the argument to a Proxy invoke. 43 static constexpr size_t kProxyReferenceArgument = -4; 44 // The maximum precise vreg number 45 static constexpr size_t kMaxVReg = std::numeric_limits<uint16_t>::max(); 46 JavaFrameRootInfo(uint32_t thread_id,const StackVisitor * stack_visitor,size_t vreg)47 JavaFrameRootInfo(uint32_t thread_id, const StackVisitor* stack_visitor, size_t vreg) 48 : RootInfo(kRootJavaFrame, thread_id), stack_visitor_(stack_visitor), vreg_(vreg) { 49 } 50 void Describe(std::ostream& os) const override 51 REQUIRES_SHARED(Locks::mutator_lock_); 52 GetVReg()53 size_t GetVReg() const { 54 return vreg_; 55 } GetVisitor()56 const StackVisitor* GetVisitor() const { 57 return stack_visitor_; 58 } 59 60 private: 61 const StackVisitor* const stack_visitor_; 62 const size_t vreg_; 63 }; 64 65 } // namespace art 66 67 #endif // ART_RUNTIME_JAVA_FRAME_ROOT_INFO_H_ 68