lldb/source/Core/ValueObjectCast.cpp

   1 //===-- ValueObjectCast.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/Core/ValueObjectCast.h"
  10
  11 #include "lldb/Core/Value.h"
  12 #include "lldb/Core/ValueObject.h"
  13 #include "lldb/Symbol/CompilerType.h"
  14 #include "lldb/Target/ExecutionContext.h"
  15 #include "lldb/Utility/Scalar.h"
  16 #include "lldb/Utility/Status.h"
  17 #include <optional>
  18
  19 namespace lldb_private {
  20 class ConstString;
  21 }
  22
  23 using namespace lldb_private;
  24
  25 lldb::ValueObjectSP ValueObjectCast::Create(ValueObject &parent,
  26                                             ConstString name,
  27                                             const CompilerType &cast_type) {
  28   ValueObjectCast *cast_valobj_ptr =
  29       new ValueObjectCast(parent, name, cast_type);
  30   return cast_valobj_ptr->GetSP();
  31 }
  32
  33 ValueObjectCast::ValueObjectCast(ValueObject &parent, ConstString name,
  34                                  const CompilerType &cast_type)
  35     : ValueObject(parent), m_cast_type(cast_type) {
  36   SetName(name);
  37   m_value.SetCompilerType(cast_type);
  38 }
  39
  40 ValueObjectCast::~ValueObjectCast() = default;
  41
  42 CompilerType ValueObjectCast::GetCompilerTypeImpl() { return m_cast_type; }
  43
  44 size_t ValueObjectCast::CalculateNumChildren(uint32_t max) {
  45   ExecutionContext exe_ctx(GetExecutionContextRef());
  46   auto children_count = GetCompilerType().GetNumChildren(
  47       true, &exe_ctx);
  48   return children_count <= max ? children_count : max;
  49 }
  50
  51 std::optional<uint64_t> ValueObjectCast::GetByteSize() {
  52   ExecutionContext exe_ctx(GetExecutionContextRef());
  53   return m_value.GetValueByteSize(nullptr, &exe_ctx);
  54 }
  55
  56 lldb::ValueType ValueObjectCast::GetValueType() const {
  57   // Let our parent answer global, local, argument, etc...
  58   return m_parent->GetValueType();
  59 }
  60
  61 bool ValueObjectCast::UpdateValue() {
  62   SetValueIsValid(false);
  63   m_error.Clear();
  64
  65   if (m_parent->UpdateValueIfNeeded(false)) {
  66     Value old_value(m_value);
  67     m_update_point.SetUpdated();
  68     m_value = m_parent->GetValue();
  69     CompilerType compiler_type(GetCompilerType());
  70     m_value.SetCompilerType(compiler_type);
  71     SetAddressTypeOfChildren(m_parent->GetAddressTypeOfChildren());
  72     if (!CanProvideValue()) {
  73       // this value object represents an aggregate type whose children have
  74       // values, but this object does not. So we say we are changed if our
  75       // location has changed.
  76       SetValueDidChange(m_value.GetValueType() != old_value.GetValueType() ||
  77                         m_value.GetScalar() != old_value.GetScalar());
  78     }
  79     ExecutionContext exe_ctx(GetExecutionContextRef());
  80     m_error = m_value.GetValueAsData(&exe_ctx, m_data, GetModule().get());
  81     SetValueDidChange(m_parent->GetValueDidChange());
  82     return true;
  83   }
  84
  85   // The dynamic value failed to get an error, pass the error along
  86   if (m_error.Success() && m_parent->GetError().Fail())
  87     m_error = m_parent->GetError();
  88   SetValueIsValid(false);
  89   return false;
  90 }
  91
  92 bool ValueObjectCast::IsInScope() { return m_parent->IsInScope(); }