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
20namespace art {
21
22class ArenaAllocator;
23class CompiledMethod;
24
25class Backend {
26  public:
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     */
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     */
48    virtual int NumReservableVectorRegisters(bool fp_used) { return 0; }
49
50  protected:
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