1 /* 2 * Copyright (c) 2021 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #ifndef PANDA_LIBPANDABASE_MEM_CODE_ALLOCATOR_H_ 17 #define PANDA_LIBPANDABASE_MEM_CODE_ALLOCATOR_H_ 18 19 #include "utils/arena_containers.h" 20 #include "os/mem.h" 21 #include "os/mutex.h" 22 23 namespace panda { 24 25 class BaseMemStats; 26 27 class CodeAllocator { 28 public: 29 explicit CodeAllocator(BaseMemStats *mem_stats); 30 ~CodeAllocator(); 31 NO_COPY_SEMANTIC(CodeAllocator); 32 NO_MOVE_SEMANTIC(CodeAllocator); 33 34 /** 35 * \brief Allocates \param size bytes, copies \param codeBuff to allocated memory and makes this memory executable 36 * @param size 37 * @param codeBuff 38 * @return 39 */ 40 [[nodiscard]] void *AllocateCode(size_t size, const void *code_buff); 41 42 /** 43 * \brief Allocates \param size bytes of non-protected memory 44 * @param size to be allocated 45 * @return MapRange of the allocated code 46 */ 47 [[nodiscard]] os::mem::MapRange<std::byte> AllocateCodeUnprotected(size_t size); 48 49 /** 50 * Make memory \mem_range executable 51 * @param mem_range 52 */ 53 static void ProtectCode(os::mem::MapRange<std::byte> mem_range); 54 55 /** 56 * Fast checks if the given program counter belongs to JIT code 57 */ 58 bool InAllocatedCodeRange(const void *pc); 59 60 private: 61 void CodeRangeUpdate(void *ptr, size_t size); 62 63 private: 64 static const Alignment PAGE_LOG_ALIGN; 65 66 ArenaAllocator arenaAllocator_; 67 BaseMemStats *memStats_; 68 os::memory::RWLock code_range_lock_; 69 void *codeRangeStart_; 70 void *codeRangeEnd_; 71 }; 72 73 } // namespace panda 74 75 #endif // PANDA_LIBPANDABASE_MEM_CODE_ALLOCATOR_H_ 76