1 /**
2  * Copyright (c) 2021-2022 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 BYTECODE_OPTIMIZER_BYTECODE_ENCODER_H
17 #define BYTECODE_OPTIMIZER_BYTECODE_ENCODER_H
18 
19 #include <stdint.h>
20 
21 #include "compiler/optimizer/code_generator/encode.h"
22 
23 namespace panda::bytecodeopt {
24 class BytecodeEncoder final : public compiler::Encoder {
25 public:
BytecodeEncoder(ArenaAllocator *allocator)26     explicit BytecodeEncoder(ArenaAllocator *allocator) : Encoder(allocator, Arch::NONE) {}
27 
28     void Finalize() override {};
29 
CanEncodeImmHelper(int64_t imm, uint32_t size, int64_t min, int64_t max)30     static bool CanEncodeImmHelper(int64_t imm, uint32_t size, int64_t min, int64_t max)
31     {
32         constexpr uint8_t HALF_SIZE = 32;
33         if (size != HALF_SIZE) {
34             return false;
35         }
36 
37         return imm >= min && imm <= max;
38     }
39 
40     bool CanEncodeImmAddSubCmp(int64_t imm, uint32_t size, [[maybe_unused]] bool signed_compare) override
41     {
42         return CanEncodeImmHelper(imm, size, INT8_MIN, INT8_MAX);
43     }
44 
45     bool CanEncodeImmMulDivMod(uint64_t imm, uint32_t size) override
46     {
47         return CanEncodeImmAddSubCmp(imm, size, false);
48     }
49 
50     bool CanEncodeImmLogical(uint64_t imm, uint32_t size) override
51     {
52         return CanEncodeImmHelper(imm, size, INT32_MIN, INT32_MAX);
53     }
54 
55     bool CanEncodeShift(uint32_t size) override
56     {
57         constexpr uint32_t UNSUPPORTED_SHIFT_SIZE = 64;
58         return size != UNSUPPORTED_SHIFT_SIZE;
59     }
60     size_t GetLabelAddress(compiler::LabelHolder::LabelId) override
61     {
62         return 0;
63     }
64     bool LabelHasLinks(compiler::LabelHolder::LabelId) override
65     {
66         return false;
67     }
68 };  // BytecodeEncoder
69 }  // namespace panda::bytecodeopt
70 
71 #endif  // BYTECODE_OPTIMIZER_BYTECODE_ENCODER_H
72