src/compiled_method.cc

/*
 * 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.
 */

#include "compiled_method.h"

namespace art {

uint32_t CompiledCode::AlignCode(uint32_t offset) const {
  return AlignCode(offset, instruction_set_);
}

uint32_t CompiledCode::AlignCode(uint32_t offset, InstructionSet instruction_set) {
  switch (instruction_set) {
    case kArm:
    case kThumb2:
      return RoundUp(offset, kArmAlignment);
    case kMips:
      return RoundUp(offset, kMipsAlignment);
    case kX86:
      return RoundUp(offset, kX86Alignment);
    default:
      LOG(FATAL) << "Unknown InstructionSet: " << instruction_set;
      return 0;
  }
}

size_t CompiledCode::CodeDelta() const {
  switch (instruction_set_) {
    case kArm:
    case kMips:
    case kX86:
      return 0;
    case kThumb2: {
      // +1 to set the low-order bit so a BLX will switch to Thumb mode
      return 1;
    }
    default:
      LOG(FATAL) << "Unknown InstructionSet: " << instruction_set_;
      return 0;
  }
}

const void* CompiledCode::CodePointer(const void* code_pointer,
                                      InstructionSet instruction_set) {
  switch (instruction_set) {
    case kArm:
    case kMips:
    case kX86:
      return code_pointer;
    case kThumb2: {
      uintptr_t address = reinterpret_cast<uintptr_t>(code_pointer);
      // Set the low-order bit so a BLX will switch to Thumb mode
      address |= 0x1;
      return reinterpret_cast<const void*>(address);
    }
    default:
      LOG(FATAL) << "Unknown InstructionSet: " << instruction_set;
      return NULL;
  }
}

CompiledMethod::CompiledMethod(InstructionSet instruction_set,
                               const std::vector<uint8_t>& code,
                               const size_t frame_size_in_bytes,
                               const uint32_t core_spill_mask,
                               const uint32_t fp_spill_mask,
                               const std::vector<uint32_t>& mapping_table,
                               const std::vector<uint16_t>& vmap_table,
                               const std::vector<uint8_t>& native_gc_map)
    : CompiledCode(instruction_set), frame_size_in_bytes_(frame_size_in_bytes),
      core_spill_mask_(core_spill_mask), fp_spill_mask_(fp_spill_mask),
      native_gc_map_(native_gc_map)
{
  CHECK_NE(code.size(), 0U);
  DCHECK_EQ(vmap_table.size(),
            static_cast<uint32_t>(__builtin_popcount(core_spill_mask)
                                  + __builtin_popcount(fp_spill_mask)));
  CHECK_LE(vmap_table.size(), (1U << 16) - 1); // length must fit in 2^16-1

  size_t code_byte_count = code.size() * sizeof(code[0]);
  std::vector<uint8_t> byte_code(code_byte_count);
  memcpy(&byte_code[0], &code[0], code_byte_count);

  std::vector<uint32_t> length_prefixed_mapping_table;
  length_prefixed_mapping_table.push_back(mapping_table.size());
  length_prefixed_mapping_table.insert(length_prefixed_mapping_table.end(),
                                       mapping_table.begin(),
                                       mapping_table.end());
  DCHECK_EQ(mapping_table.size() + 1, length_prefixed_mapping_table.size());

  std::vector<uint16_t> length_prefixed_vmap_table;
  length_prefixed_vmap_table.push_back(vmap_table.size());
  length_prefixed_vmap_table.insert(length_prefixed_vmap_table.end(),
                                    vmap_table.begin(),
                                    vmap_table.end());
  DCHECK_EQ(vmap_table.size() + 1, length_prefixed_vmap_table.size());
  DCHECK_EQ(vmap_table.size(), length_prefixed_vmap_table[0]);

  SetCode(byte_code);
  mapping_table_ = length_prefixed_mapping_table;
  vmap_table_ = length_prefixed_vmap_table;
  DCHECK_EQ(vmap_table_[0], static_cast<uint32_t>(__builtin_popcount(core_spill_mask) + __builtin_popcount(fp_spill_mask)));
}

CompiledMethod::CompiledMethod(InstructionSet instruction_set,
                               const std::vector<uint8_t>& code,
                               const size_t frame_size_in_bytes,
                               const uint32_t core_spill_mask,
                               const uint32_t fp_spill_mask)
    : CompiledCode(instruction_set, code),
      frame_size_in_bytes_(frame_size_in_bytes),
      core_spill_mask_(core_spill_mask), fp_spill_mask_(fp_spill_mask) {
}

CompiledInvokeStub::CompiledInvokeStub(InstructionSet instruction_set)
    : CompiledCode(instruction_set) {
}

CompiledInvokeStub::CompiledInvokeStub(InstructionSet instruction_set,
                                       const std::vector<uint8_t>& code)
    : CompiledCode(instruction_set, code) {
}

}  // namespace art