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 
13 using namespace lldb_private;
14 
15 RegisterNumber::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 
29 RegisterNumber::RegisterNumber()
30     : m_reg_ctx_sp(), m_regnum(LLDB_INVALID_REGNUM),
31       m_kind(lldb::kNumRegisterKinds), m_kind_regnum_map(), m_name(nullptr) {}
32 
33 void 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 
48 const 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 
58 bool 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 
75 bool RegisterNumber::operator!=(RegisterNumber &rhs) { return !(*this == rhs); }
76 
77 bool RegisterNumber::IsValid() const {
78   return m_reg_ctx_sp.get() && m_kind != lldb::kNumRegisterKinds &&
79          m_regnum != LLDB_INVALID_REGNUM;
80 }
81 
82 uint32_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 
103 uint32_t RegisterNumber::GetRegisterNumber() const { return m_regnum; }
104 
105 lldb::RegisterKind RegisterNumber::GetRegisterKind() const { return m_kind; }
106 
107 const char *RegisterNumber::GetName() { return m_name; }
108