1 //===--------------------- RegisterNumber.cpp -------------------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "lldb/Target/RegisterNumber.h"
11 #include "lldb/Target/RegisterContext.h"
12 #include "lldb/Target/Thread.h"
13 
14 using namespace lldb_private;
15 
16 RegisterNumber::RegisterNumber(lldb_private::Thread &thread,
17                                lldb::RegisterKind kind, uint32_t num)
18     : m_reg_ctx_sp(thread.GetRegisterContext()), m_regnum(num), m_kind(kind),
19       m_kind_regnum_map(), m_name("") {
20   if (m_reg_ctx_sp.get()) {
21     const lldb_private::RegisterInfo *reginfo =
22         m_reg_ctx_sp->GetRegisterInfoAtIndex(
23             GetAsKind(lldb::eRegisterKindLLDB));
24     if (reginfo && reginfo->name) {
25       m_name = reginfo->name;
26     }
27   }
28 }
29 
30 RegisterNumber::RegisterNumber()
31     : m_reg_ctx_sp(), m_regnum(LLDB_INVALID_REGNUM),
32       m_kind(lldb::kNumRegisterKinds), m_kind_regnum_map(), m_name(nullptr) {}
33 
34 void RegisterNumber::init(lldb_private::Thread &thread, lldb::RegisterKind kind,
35                           uint32_t num) {
36   m_reg_ctx_sp = thread.GetRegisterContext();
37   m_regnum = num;
38   m_kind = kind;
39   if (m_reg_ctx_sp.get()) {
40     const lldb_private::RegisterInfo *reginfo =
41         m_reg_ctx_sp->GetRegisterInfoAtIndex(
42             GetAsKind(lldb::eRegisterKindLLDB));
43     if (reginfo && reginfo->name) {
44       m_name = reginfo->name;
45     }
46   }
47 }
48 
49 const RegisterNumber &RegisterNumber::operator=(const RegisterNumber &rhs) {
50   m_reg_ctx_sp = rhs.m_reg_ctx_sp;
51   m_regnum = rhs.m_regnum;
52   m_kind = rhs.m_kind;
53   for (auto it : rhs.m_kind_regnum_map)
54     m_kind_regnum_map[it.first] = it.second;
55   m_name = rhs.m_name;
56   return *this;
57 }
58 
59 bool RegisterNumber::operator==(RegisterNumber &rhs) {
60   if (IsValid() != rhs.IsValid())
61     return false;
62 
63   if (m_kind == rhs.m_kind) {
64     return m_regnum == rhs.m_regnum;
65   }
66 
67   uint32_t rhs_regnum = rhs.GetAsKind(m_kind);
68   if (rhs_regnum != LLDB_INVALID_REGNUM) {
69     return m_regnum == rhs_regnum;
70   }
71   uint32_t lhs_regnum = GetAsKind(rhs.m_kind);
72   { return lhs_regnum == rhs.m_regnum; }
73   return false;
74 }
75 
76 bool RegisterNumber::operator!=(RegisterNumber &rhs) { return !(*this == rhs); }
77 
78 bool RegisterNumber::IsValid() const {
79   return m_reg_ctx_sp.get() && m_kind != lldb::kNumRegisterKinds &&
80          m_regnum != LLDB_INVALID_REGNUM;
81 }
82 
83 uint32_t RegisterNumber::GetAsKind(lldb::RegisterKind kind) {
84   if (m_regnum == LLDB_INVALID_REGNUM)
85     return LLDB_INVALID_REGNUM;
86 
87   if (kind == m_kind)
88     return m_regnum;
89 
90   Collection::iterator iter = m_kind_regnum_map.find(kind);
91   if (iter != m_kind_regnum_map.end()) {
92     return iter->second;
93   }
94   uint32_t output_regnum = LLDB_INVALID_REGNUM;
95   if (m_reg_ctx_sp &&
96       m_reg_ctx_sp->ConvertBetweenRegisterKinds(m_kind, m_regnum, kind,
97                                                 output_regnum) &&
98       output_regnum != LLDB_INVALID_REGNUM) {
99     m_kind_regnum_map[kind] = output_regnum;
100   }
101   return output_regnum;
102 }
103 
104 uint32_t RegisterNumber::GetRegisterNumber() const { return m_regnum; }
105 
106 lldb::RegisterKind RegisterNumber::GetRegisterKind() const { return m_kind; }
107 
108 const char *RegisterNumber::GetName() { return m_name; }
109