compiler/optimizing/nodes_mips.h

/*
 * Copyright (C) 2016 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_OPTIMIZING_NODES_MIPS_H_
#define ART_COMPILER_OPTIMIZING_NODES_MIPS_H_

namespace art {

// Compute the address of the method for MIPS Constant area support.
class HMipsComputeBaseMethodAddress : public HExpression<0> {
 public:
  // Treat the value as an int32_t, but it is really a 32 bit native pointer.
  HMipsComputeBaseMethodAddress()
      : HExpression(Primitive::kPrimInt, SideEffects::None(), kNoDexPc) {}

  bool CanBeMoved() const OVERRIDE { return true; }

  DECLARE_INSTRUCTION(MipsComputeBaseMethodAddress);

 private:
  DISALLOW_COPY_AND_ASSIGN(HMipsComputeBaseMethodAddress);
};

class HMipsDexCacheArraysBase : public HExpression<0> {
 public:
  explicit HMipsDexCacheArraysBase(const DexFile& dex_file)
      : HExpression(Primitive::kPrimInt, SideEffects::None(), kNoDexPc),
        dex_file_(&dex_file),
        element_offset_(static_cast<size_t>(-1)) { }

  bool CanBeMoved() const OVERRIDE { return true; }

  void UpdateElementOffset(size_t element_offset) {
    // We'll maximize the range of a single load instruction for dex cache array accesses
    // by aligning offset -32768 with the offset of the first used element.
    element_offset_ = std::min(element_offset_, element_offset);
  }

  const DexFile& GetDexFile() const {
    return *dex_file_;
  }

  size_t GetElementOffset() const {
    return element_offset_;
  }

  DECLARE_INSTRUCTION(MipsDexCacheArraysBase);

 private:
  const DexFile* dex_file_;
  size_t element_offset_;

  DISALLOW_COPY_AND_ASSIGN(HMipsDexCacheArraysBase);
};

// Mips version of HPackedSwitch that holds a pointer to the base method address.
class HMipsPackedSwitch FINAL : public HTemplateInstruction<2> {
 public:
  HMipsPackedSwitch(int32_t start_value,
                    int32_t num_entries,
                    HInstruction* input,
                    HMipsComputeBaseMethodAddress* method_base,
                    uint32_t dex_pc)
    : HTemplateInstruction(SideEffects::None(), dex_pc),
      start_value_(start_value),
      num_entries_(num_entries) {
    SetRawInputAt(0, input);
    SetRawInputAt(1, method_base);
  }

  bool IsControlFlow() const OVERRIDE { return true; }

  int32_t GetStartValue() const { return start_value_; }

  int32_t GetNumEntries() const { return num_entries_; }

  HBasicBlock* GetDefaultBlock() const {
    // Last entry is the default block.
    return GetBlock()->GetSuccessors()[num_entries_];
  }

  DECLARE_INSTRUCTION(MipsPackedSwitch);

 private:
  const int32_t start_value_;
  const int32_t num_entries_;

  DISALLOW_COPY_AND_ASSIGN(HMipsPackedSwitch);
};

}  // namespace art

#endif  // ART_COMPILER_OPTIMIZING_NODES_MIPS_H_