lldb/source/Target/RegisterNumber.cpp

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