compiler/jni/quick/arm/calling_convention_arm.h

/*
 * 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_COMPILER_JNI_QUICK_ARM_CALLING_CONVENTION_ARM_H_
#define ART_COMPILER_JNI_QUICK_ARM_CALLING_CONVENTION_ARM_H_

#include "jni/quick/calling_convention.h"

namespace art {
namespace arm {

constexpr size_t kFramePointerSize = 4;

class ArmManagedRuntimeCallingConvention FINAL : public ManagedRuntimeCallingConvention {
 public:
  ArmManagedRuntimeCallingConvention(bool is_static, bool is_synchronized, const char* shorty)
      : ManagedRuntimeCallingConvention(is_static, is_synchronized, shorty, kFramePointerSize) {}
  ~ArmManagedRuntimeCallingConvention() OVERRIDE {}
  // Calling convention
  ManagedRegister ReturnRegister() OVERRIDE;
  ManagedRegister InterproceduralScratchRegister() OVERRIDE;
  // Managed runtime calling convention
  ManagedRegister MethodRegister() OVERRIDE;
  bool IsCurrentParamInRegister() OVERRIDE;
  bool IsCurrentParamOnStack() OVERRIDE;
  ManagedRegister CurrentParamRegister() OVERRIDE;
  FrameOffset CurrentParamStackOffset() OVERRIDE;
  const ManagedRegisterEntrySpills& EntrySpills() OVERRIDE;

 private:
  ManagedRegisterEntrySpills entry_spills_;

  DISALLOW_COPY_AND_ASSIGN(ArmManagedRuntimeCallingConvention);
};

class ArmJniCallingConvention FINAL : public JniCallingConvention {
 public:
  explicit ArmJniCallingConvention(bool is_static, bool is_synchronized, const char* shorty);
  ~ArmJniCallingConvention() OVERRIDE {}
  // Calling convention
  ManagedRegister ReturnRegister() OVERRIDE;
  ManagedRegister IntReturnRegister() OVERRIDE;
  ManagedRegister InterproceduralScratchRegister() OVERRIDE;
  // JNI calling convention
  void Next() OVERRIDE;  // Override default behavior for AAPCS
  size_t FrameSize() OVERRIDE;
  size_t OutArgSize() OVERRIDE;
  const std::vector<ManagedRegister>& CalleeSaveRegisters() const OVERRIDE {
    return callee_save_regs_;
  }
  ManagedRegister ReturnScratchRegister() const OVERRIDE;
  uint32_t CoreSpillMask() const OVERRIDE;
  uint32_t FpSpillMask() const OVERRIDE {
    return 0;  // Floats aren't spilled in JNI down call
  }
  bool IsCurrentParamInRegister() OVERRIDE;
  bool IsCurrentParamOnStack() OVERRIDE;
  ManagedRegister CurrentParamRegister() OVERRIDE;
  FrameOffset CurrentParamStackOffset() OVERRIDE;

  // AAPCS mandates return values are extended.
  bool RequiresSmallResultTypeExtension() const OVERRIDE {
    return false;
  }

 protected:
  size_t NumberOfOutgoingStackArgs() OVERRIDE;

 private:
  // TODO: these values aren't unique and can be shared amongst instances
  std::vector<ManagedRegister> callee_save_regs_;

  // Padding to ensure longs and doubles are not split in AAPCS
  size_t padding_;

  DISALLOW_COPY_AND_ASSIGN(ArmJniCallingConvention);
};

}  // namespace arm
}  // namespace art

#endif  // ART_COMPILER_JNI_QUICK_ARM_CALLING_CONVENTION_ARM_H_