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
Create(ValueObject & parent,ConstString name,const CompilerType & cast_type)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
ValueObjectCast(ValueObject & parent,ConstString name,const CompilerType & cast_type)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
GetCompilerTypeImpl()42 CompilerType ValueObjectCast::GetCompilerTypeImpl() { return m_cast_type; }
43
CalculateNumChildren(uint32_t max)44 llvm::Expected<uint32_t> ValueObjectCast::CalculateNumChildren(uint32_t max) {
45 ExecutionContext exe_ctx(GetExecutionContextRef());
46 auto children_count = GetCompilerType().GetNumChildren(
47 true, &exe_ctx);
48 if (!children_count)
49 return children_count;
50 return *children_count <= max ? *children_count : max;
51 }
52
GetByteSize()53 std::optional<uint64_t> ValueObjectCast::GetByteSize() {
54 ExecutionContext exe_ctx(GetExecutionContextRef());
55 return m_value.GetValueByteSize(nullptr, &exe_ctx);
56 }
57
GetValueType() const58 lldb::ValueType ValueObjectCast::GetValueType() const {
59 // Let our parent answer global, local, argument, etc...
60 return m_parent->GetValueType();
61 }
62
UpdateValue()63 bool ValueObjectCast::UpdateValue() {
64 SetValueIsValid(false);
65 m_error.Clear();
66
67 if (m_parent->UpdateValueIfNeeded(false)) {
68 Value old_value(m_value);
69 m_update_point.SetUpdated();
70 m_value = m_parent->GetValue();
71 CompilerType compiler_type(GetCompilerType());
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
IsInScope()94 bool ValueObjectCast::IsInScope() { return m_parent->IsInScope(); }
95