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      1 /*
      2  * Copyright (C) 2016 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_MIRROR_EMULATED_STACK_FRAME_H_
     18 #define ART_RUNTIME_MIRROR_EMULATED_STACK_FRAME_H_
     19 
     20 #include "base/utils.h"
     21 #include "dex/dex_instruction.h"
     22 #include "method_type.h"
     23 #include "object.h"
     24 #include "stack.h"
     25 #include "string.h"
     26 
     27 namespace art {
     28 
     29 struct EmulatedStackFrameOffsets;
     30 
     31 namespace mirror {
     32 
     33 // C++ mirror of dalvik.system.EmulatedStackFrame
     34 class MANAGED EmulatedStackFrame : public Object {
     35  public:
     36   // Creates an emulated stack frame whose type is |frame_type| from
     37   // a shadow frame.
     38   static mirror::EmulatedStackFrame* CreateFromShadowFrameAndArgs(
     39       Thread* self,
     40       Handle<mirror::MethodType> args_type,
     41       Handle<mirror::MethodType> frame_type,
     42       const ShadowFrame& caller_frame,
     43       const InstructionOperands* const operands) REQUIRES_SHARED(Locks::mutator_lock_);
     44 
     45   // Writes the contents of this emulated stack frame to the |callee_frame|
     46   // whose type is |callee_type|, starting at |first_dest_reg|.
     47   bool WriteToShadowFrame(
     48       Thread* self,
     49       Handle<mirror::MethodType> callee_type,
     50       const uint32_t first_dest_reg,
     51       ShadowFrame* callee_frame) REQUIRES_SHARED(Locks::mutator_lock_);
     52 
     53   // Sets |value| to the return value written to this emulated stack frame (if any).
     54   void GetReturnValue(Thread* self, JValue* value) REQUIRES_SHARED(Locks::mutator_lock_);
     55 
     56   // Sets the return value slot of this emulated stack frame to |value|.
     57   void SetReturnValue(Thread* self, const JValue& value) REQUIRES_SHARED(Locks::mutator_lock_);
     58 
     59   mirror::MethodType* GetType() REQUIRES_SHARED(Locks::mutator_lock_) {
     60     return GetFieldObject<MethodType>(OFFSET_OF_OBJECT_MEMBER(EmulatedStackFrame, type_));
     61   }
     62 
     63   mirror::Object* GetReceiver() REQUIRES_SHARED(Locks::mutator_lock_) {
     64     return GetReferences()->Get(0);
     65   }
     66 
     67   static void SetClass(Class* klass) REQUIRES_SHARED(Locks::mutator_lock_);
     68   static void ResetClass() REQUIRES_SHARED(Locks::mutator_lock_);
     69   static void VisitRoots(RootVisitor* visitor) REQUIRES_SHARED(Locks::mutator_lock_);
     70 
     71  private:
     72   static mirror::Class* StaticClass() REQUIRES_SHARED(Locks::mutator_lock_) {
     73     return static_class_.Read();
     74   }
     75 
     76   mirror::ObjectArray<mirror::Object>* GetReferences() REQUIRES_SHARED(Locks::mutator_lock_) {
     77     return GetFieldObject<mirror::ObjectArray<mirror::Object>>(
     78         OFFSET_OF_OBJECT_MEMBER(EmulatedStackFrame, references_));
     79   }
     80 
     81   mirror::ByteArray* GetStackFrame() REQUIRES_SHARED(Locks::mutator_lock_) {
     82     return GetFieldObject<mirror::ByteArray>(
     83         OFFSET_OF_OBJECT_MEMBER(EmulatedStackFrame, stack_frame_));
     84   }
     85 
     86   static MemberOffset CallsiteTypeOffset() {
     87     return MemberOffset(OFFSETOF_MEMBER(EmulatedStackFrame, callsite_type_));
     88   }
     89 
     90   static MemberOffset TypeOffset() {
     91     return MemberOffset(OFFSETOF_MEMBER(EmulatedStackFrame, type_));
     92   }
     93 
     94   static MemberOffset ReferencesOffset() {
     95     return MemberOffset(OFFSETOF_MEMBER(EmulatedStackFrame, references_));
     96   }
     97 
     98   static MemberOffset StackFrameOffset() {
     99     return MemberOffset(OFFSETOF_MEMBER(EmulatedStackFrame, stack_frame_));
    100   }
    101 
    102   HeapReference<mirror::MethodType> callsite_type_;
    103   HeapReference<mirror::ObjectArray<mirror::Object>> references_;
    104   HeapReference<mirror::ByteArray> stack_frame_;
    105   HeapReference<mirror::MethodType> type_;
    106 
    107   static GcRoot<mirror::Class> static_class_;  // dalvik.system.EmulatedStackFrame.class
    108 
    109   friend struct art::EmulatedStackFrameOffsets;  // for verifying offset information
    110   DISALLOW_IMPLICIT_CONSTRUCTORS(EmulatedStackFrame);
    111 };
    112 
    113 }  // namespace mirror
    114 }  // namespace art
    115 
    116 #endif  // ART_RUNTIME_MIRROR_EMULATED_STACK_FRAME_H_
    117