text: /*
   * 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_ARCH_CONTEXT_H_
  #define ART_RUNTIME_ARCH_CONTEXT_H_
  
  #include <stddef.h>
  #include <museum/6.0.1/bionic/libc/stdint.h>
  
  #include <museum/6.0.1/art/runtime/base/macros.h>
  #include <museum/6.0.1/art/runtime/base/mutex.h>
  
  namespace facebook { namespace museum { namespace MUSEUM_VERSION { namespace art {
  
  class StackVisitor;
  
  // Representation of a thread's context on the executing machine, used to implement long jumps in
  // the quick stack frame layout.
  class Context {
   public:
    // Creates a context for the running architecture
    static Context* Create();
  
    virtual ~Context() {}
  
    // Re-initializes the registers for context re-use.
    virtual void Reset() = 0;
  
    // Reads values from callee saves in the given frame. The frame also holds
    // the method that holds the layout.
    virtual void FillCalleeSaves(const StackVisitor& fr)
        SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) = 0;
  
    // Sets the stack pointer value.
    virtual void SetSP(uintptr_t new_sp) = 0;
  
    // Sets the program counter value.
    virtual void SetPC(uintptr_t new_pc) = 0;
  
    // Returns whether the given GPR is accessible (read or write).
    virtual bool IsAccessibleGPR(uint32_t reg) = 0;
  
    // Gets the given GPRs address.
    virtual uintptr_t* GetGPRAddress(uint32_t reg) = 0;
  
    // Reads the given GPR. The caller is responsible for checking the register
    // is accessible with IsAccessibleGPR.
    virtual uintptr_t GetGPR(uint32_t reg) = 0;
  
    // Sets the given GPR. The caller is responsible for checking the register
    // is accessible with IsAccessibleGPR.
    virtual void SetGPR(uint32_t reg, uintptr_t value) = 0;
  
    // Returns whether the given FPR is accessible (read or write).
    virtual bool IsAccessibleFPR(uint32_t reg) = 0;
  
    // Reads the given FPR. The caller is responsible for checking the register
    // is accessible with IsAccessibleFPR.
    virtual uintptr_t GetFPR(uint32_t reg) = 0;
  
    // Sets the given FPR. The caller is responsible for checking the register
    // is accessible with IsAccessibleFPR.
    virtual void SetFPR(uint32_t reg, uintptr_t value) = 0;
  
    // Smashes the caller save registers. If we're throwing, we don't want to return bogus values.
    virtual void SmashCallerSaves() = 0;
  
    // Switches execution of the executing context to this context
    NO_RETURN virtual void DoLongJump() = 0;
  
   protected:
    enum {
      kBadGprBase = 0xebad6070,
      kBadFprBase = 0xebad8070,
    };
  };
  
  } } } } // namespace facebook::museum::MUSEUM_VERSION::art
  
  #endif  // ART_RUNTIME_ARCH_CONTEXT_H_
  