1 /*
2  * Copyright (C) 2016 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 _LIBUNWINDSTACK_DWARF_MEMORY_H
18 #define _LIBUNWINDSTACK_DWARF_MEMORY_H
19 
20 #include <stdint.h>
21 
22 namespace unwindstack {
23 
24 // Forward declarations.
25 class Memory;
26 
27 class DwarfMemory {
28  public:
DwarfMemory(Memory * memory)29   DwarfMemory(Memory* memory) : memory_(memory) {}
30   virtual ~DwarfMemory() = default;
31 
32   bool ReadBytes(void* dst, size_t num_bytes);
33 
34   template <typename SignedType>
35   bool ReadSigned(uint64_t* value);
36 
37   bool ReadULEB128(uint64_t* value);
38 
39   bool ReadSLEB128(int64_t* value);
40 
41   template <typename AddressType>
42   size_t GetEncodedSize(uint8_t encoding);
43 
44   bool AdjustEncodedValue(uint8_t encoding, uint64_t* value);
45 
46   template <typename AddressType>
47   bool ReadEncodedValue(uint8_t encoding, uint64_t* value);
48 
cur_offset()49   uint64_t cur_offset() { return cur_offset_; }
set_cur_offset(uint64_t cur_offset)50   void set_cur_offset(uint64_t cur_offset) { cur_offset_ = cur_offset; }
51 
set_pc_offset(int64_t offset)52   void set_pc_offset(int64_t offset) { pc_offset_ = offset; }
clear_pc_offset()53   void clear_pc_offset() { pc_offset_ = INT64_MAX; }
54 
set_data_offset(uint64_t offset)55   void set_data_offset(uint64_t offset) { data_offset_ = offset; }
clear_data_offset()56   void clear_data_offset() { data_offset_ = static_cast<uint64_t>(-1); }
57 
set_func_offset(uint64_t offset)58   void set_func_offset(uint64_t offset) { func_offset_ = offset; }
clear_func_offset()59   void clear_func_offset() { func_offset_ = static_cast<uint64_t>(-1); }
60 
set_text_offset(uint64_t offset)61   void set_text_offset(uint64_t offset) { text_offset_ = offset; }
clear_text_offset()62   void clear_text_offset() { text_offset_ = static_cast<uint64_t>(-1); }
63 
64  private:
65   Memory* memory_;
66   uint64_t cur_offset_ = 0;
67 
68   int64_t pc_offset_ = INT64_MAX;
69   uint64_t data_offset_ = static_cast<uint64_t>(-1);
70   uint64_t func_offset_ = static_cast<uint64_t>(-1);
71   uint64_t text_offset_ = static_cast<uint64_t>(-1);
72 };
73 
74 }  // namespace unwindstack
75 
76 #endif  // _LIBUNWINDSTACK_DWARF_MEMORY_H
77