1//===--------------------- RegisterNumber.cpp -------------------*- 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#include "lldb/Target/RegisterNumber.h"
10#include "lldb/Target/RegisterContext.h"
11#include "lldb/Target/Thread.h"
12
13using namespace lldb_private;
14
15RegisterNumber::RegisterNumber(lldb_private::Thread &thread,
16                               lldb::RegisterKind kind, uint32_t num)
17    : m_reg_ctx_sp(thread.GetRegisterContext()), m_regnum(num), m_kind(kind),
18      m_kind_regnum_map(), m_name("") {
19  if (m_reg_ctx_sp.get()) {
20    const lldb_private::RegisterInfo *reginfo =
21        m_reg_ctx_sp->GetRegisterInfoAtIndex(
22            GetAsKind(lldb::eRegisterKindLLDB));
23    if (reginfo && reginfo->name) {
24      m_name = reginfo->name;
25    }
26  }
27}
28
29RegisterNumber::RegisterNumber()
30    : m_reg_ctx_sp(), m_regnum(LLDB_INVALID_REGNUM),
31      m_kind(lldb::kNumRegisterKinds), m_kind_regnum_map(), m_name(nullptr) {}
32
33void RegisterNumber::init(lldb_private::Thread &thread, lldb::RegisterKind kind,
34                          uint32_t num) {
35  m_reg_ctx_sp = thread.GetRegisterContext();
36  m_regnum = num;
37  m_kind = kind;
38  if (m_reg_ctx_sp.get()) {
39    const lldb_private::RegisterInfo *reginfo =
40        m_reg_ctx_sp->GetRegisterInfoAtIndex(
41            GetAsKind(lldb::eRegisterKindLLDB));
42    if (reginfo && reginfo->name) {
43      m_name = reginfo->name;
44    }
45  }
46}
47
48const RegisterNumber &RegisterNumber::operator=(const RegisterNumber &rhs) {
49  m_reg_ctx_sp = rhs.m_reg_ctx_sp;
50  m_regnum = rhs.m_regnum;
51  m_kind = rhs.m_kind;
52  for (auto it : rhs.m_kind_regnum_map)
53    m_kind_regnum_map[it.first] = it.second;
54  m_name = rhs.m_name;
55  return *this;
56}
57
58bool RegisterNumber::operator==(RegisterNumber &rhs) {
59  if (IsValid() != rhs.IsValid())
60    return false;
61
62  if (m_kind == rhs.m_kind) {
63    return m_regnum == rhs.m_regnum;
64  }
65
66  uint32_t rhs_regnum = rhs.GetAsKind(m_kind);
67  if (rhs_regnum != LLDB_INVALID_REGNUM) {
68    return m_regnum == rhs_regnum;
69  }
70  uint32_t lhs_regnum = GetAsKind(rhs.m_kind);
71  { return lhs_regnum == rhs.m_regnum; }
72  return false;
73}
74
75bool RegisterNumber::operator!=(RegisterNumber &rhs) { return !(*this == rhs); }
76
77bool RegisterNumber::IsValid() const {
78  return m_reg_ctx_sp.get() && m_kind != lldb::kNumRegisterKinds &&
79         m_regnum != LLDB_INVALID_REGNUM;
80}
81
82uint32_t RegisterNumber::GetAsKind(lldb::RegisterKind kind) {
83  if (m_regnum == LLDB_INVALID_REGNUM)
84    return LLDB_INVALID_REGNUM;
85
86  if (kind == m_kind)
87    return m_regnum;
88
89  Collection::iterator iter = m_kind_regnum_map.find(kind);
90  if (iter != m_kind_regnum_map.end()) {
91    return iter->second;
92  }
93  uint32_t output_regnum = LLDB_INVALID_REGNUM;
94  if (m_reg_ctx_sp &&
95      m_reg_ctx_sp->ConvertBetweenRegisterKinds(m_kind, m_regnum, kind,
96                                                output_regnum) &&
97      output_regnum != LLDB_INVALID_REGNUM) {
98    m_kind_regnum_map[kind] = output_regnum;
99  }
100  return output_regnum;
101}
102
103uint32_t RegisterNumber::GetRegisterNumber() const { return m_regnum; }
104
105lldb::RegisterKind RegisterNumber::GetRegisterKind() const { return m_kind; }
106
107const char *RegisterNumber::GetName() { return m_name; }
108