ArmUnwindInfo.h revision 355940 
1//===-- ArmUnwindInfo.h -----------------------------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef liblldb_ArmUnwindInfo_h_
10#define liblldb_ArmUnwindInfo_h_
11
12#include "lldb/Symbol/ObjectFile.h"
13#include "lldb/Utility/DataExtractor.h"
14#include "lldb/Utility/RangeMap.h"
15#include "lldb/lldb-private.h"
16#include <vector>
17
18/*
19 * Unwind information reader and parser for the ARM exception handling ABI
20 *
21 * Implemented based on:
22 *     Exception Handling ABI for the ARM Architecture
23 *     Document number: ARM IHI 0038A (current through ABI r2.09)
24 *     Date of Issue: 25th January 2007, reissued 30th November 2012
25 *     http://infocenter.arm.com/help/topic/com.arm.doc.ihi0038a/IHI0038A_ehabi.pdf
26 */
27
28namespace lldb_private {
29
30class ArmUnwindInfo {
31public:
32  ArmUnwindInfo(ObjectFile &objfile, lldb::SectionSP &arm_exidx,
33                lldb::SectionSP &arm_extab);
34
35  ~ArmUnwindInfo();
36
37  bool GetUnwindPlan(Target &target, const Address &addr,
38                     UnwindPlan &unwind_plan);
39
40private:
41  struct ArmExidxEntry {
42    ArmExidxEntry(uint32_t f, lldb::addr_t a, uint32_t d);
43
44    bool operator<(const ArmExidxEntry &other) const;
45
46    uint32_t file_address;
47    lldb::addr_t address;
48    uint32_t data;
49  };
50
51  const uint8_t *GetExceptionHandlingTableEntry(const Address &addr);
52
53  uint8_t GetByteAtOffset(const uint32_t *data, uint16_t offset) const;
54
55  uint64_t GetULEB128(const uint32_t *data, uint16_t &offset,
56                      uint16_t max_offset) const;
57
58  const lldb::ByteOrder m_byte_order;
59  lldb::SectionSP m_arm_exidx_sp; // .ARM.exidx section
60  lldb::SectionSP m_arm_extab_sp; // .ARM.extab section
61  DataExtractor m_arm_exidx_data; // .ARM.exidx section data
62  DataExtractor m_arm_extab_data; // .ARM.extab section data
63  std::vector<ArmExidxEntry> m_exidx_entries;
64};
65
66} // namespace lldb_private
67
68#endif // liblldb_ArmUnwindInfo_h_
69