ValueObjectCast.cpp revision 360784 
1//===-- ValueObjectCast.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/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
18namespace lldb_private {
19class ConstString;
20}
21
22using namespace lldb_private;
23
24lldb::ValueObjectSP ValueObjectCast::Create(ValueObject &parent,
25                                            ConstString name,
26                                            const CompilerType &cast_type) {
27  ValueObjectCast *cast_valobj_ptr =
28      new ValueObjectCast(parent, name, cast_type);
29  return cast_valobj_ptr->GetSP();
30}
31
32ValueObjectCast::ValueObjectCast(ValueObject &parent, ConstString name,
33                                 const CompilerType &cast_type)
34    : ValueObject(parent), m_cast_type(cast_type) {
35  SetName(name);
36  // m_value.SetContext (Value::eContextTypeClangType,
37  // cast_type.GetOpaqueQualType());
38  m_value.SetCompilerType(cast_type);
39}
40
41ValueObjectCast::~ValueObjectCast() {}
42
43CompilerType ValueObjectCast::GetCompilerTypeImpl() { return m_cast_type; }
44
45size_t ValueObjectCast::CalculateNumChildren(uint32_t max) {
46  ExecutionContext exe_ctx(GetExecutionContextRef());
47  auto children_count = GetCompilerType().GetNumChildren(
48      true, &exe_ctx);
49  return children_count <= max ? children_count : max;
50}
51
52uint64_t ValueObjectCast::GetByteSize() {
53  ExecutionContext exe_ctx(GetExecutionContextRef());
54  return m_value.GetValueByteSize(nullptr, &exe_ctx);
55}
56
57lldb::ValueType ValueObjectCast::GetValueType() const {
58  // Let our parent answer global, local, argument, etc...
59  return m_parent->GetValueType();
60}
61
62bool ValueObjectCast::UpdateValue() {
63  SetValueIsValid(false);
64  m_error.Clear();
65
66  if (m_parent->UpdateValueIfNeeded(false)) {
67    Value old_value(m_value);
68    m_update_point.SetUpdated();
69    m_value = m_parent->GetValue();
70    CompilerType compiler_type(GetCompilerType());
71    // m_value.SetContext (Value::eContextTypeClangType, compiler_type);
72    m_value.SetCompilerType(compiler_type);
73    SetAddressTypeOfChildren(m_parent->GetAddressTypeOfChildren());
74    if (!CanProvideValue()) {
75      // this value object represents an aggregate type whose children have
76      // values, but this object does not. So we say we are changed if our
77      // location has changed.
78      SetValueDidChange(m_value.GetValueType() != old_value.GetValueType() ||
79                        m_value.GetScalar() != old_value.GetScalar());
80    }
81    ExecutionContext exe_ctx(GetExecutionContextRef());
82    m_error = m_value.GetValueAsData(&exe_ctx, m_data, GetModule().get());
83    SetValueDidChange(m_parent->GetValueDidChange());
84    return true;
85  }
86
87  // The dynamic value failed to get an error, pass the error along
88  if (m_error.Success() && m_parent->GetError().Fail())
89    m_error = m_parent->GetError();
90  SetValueIsValid(false);
91  return false;
92}
93
94bool ValueObjectCast::IsInScope() { return m_parent->IsInScope(); }
95