1 /* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ART_COMPILER_DEX_BACKEND_H_ 18 #define ART_COMPILER_DEX_BACKEND_H_ 19 20 namespace art { 21 22 class ArenaAllocator; 23 class CompiledMethod; 24 25 class Backend { 26 public: ~Backend()27 virtual ~Backend() {} 28 virtual void Materialize() = 0; 29 virtual CompiledMethod* GetCompiledMethod() = 0; 30 31 // Queries for backend support for vectors 32 /* 33 * Return the number of bits in a vector register. 34 * @return 0 if vector registers are not supported, or the 35 * number of bits in the vector register if supported. 36 */ VectorRegisterSize()37 virtual int VectorRegisterSize() { return 0; } 38 39 /* 40 * Return the number of reservable vector registers supported 41 * @param fp_used ‘true’ if floating point computations will be 42 * executed while vector registers are reserved. 43 * @return the number of vector registers that are available 44 * @note The backend should ensure that sufficient vector registers 45 * are held back to generate scalar code without exhausting vector 46 * registers, if scalar code also uses the vector registers. 47 */ NumReservableVectorRegisters(bool fp_used)48 virtual int NumReservableVectorRegisters(bool fp_used) { return 0; } 49 50 protected: Backend(ArenaAllocator * arena)51 explicit Backend(ArenaAllocator* arena) : arena_(arena) {} 52 ArenaAllocator* const arena_; 53 }; // Class Backend 54 55 } // namespace art 56 57 #endif // ART_COMPILER_DEX_BACKEND_H_ 58