1 //===-- ValueObjectConstResultImpl.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/ValueObjectConstResultImpl.h" 10 11 #include "lldb/Core/Value.h" 12 #include "lldb/Core/ValueObject.h" 13 #include "lldb/Core/ValueObjectConstResult.h" 14 #include "lldb/Core/ValueObjectConstResultCast.h" 15 #include "lldb/Core/ValueObjectConstResultChild.h" 16 #include "lldb/Symbol/CompilerType.h" 17 #include "lldb/Target/ExecutionContext.h" 18 #include "lldb/Utility/DataBufferHeap.h" 19 #include "lldb/Utility/Endian.h" 20 #include "lldb/Utility/Scalar.h" 21 22 #include <string> 23 24 namespace lldb_private { 25 class DataExtractor; 26 } 27 namespace lldb_private { 28 class Status; 29 } 30 31 using namespace lldb; 32 using namespace lldb_private; 33 34 ValueObjectConstResultImpl::ValueObjectConstResultImpl( 35 ValueObject *valobj, lldb::addr_t live_address) 36 : m_impl_backend(valobj), m_live_address(live_address), 37 m_live_address_type(eAddressTypeLoad), m_load_addr_backend(), 38 m_address_of_backend() {} 39 40 lldb::ValueObjectSP ValueObjectConstResultImpl::Dereference(Status &error) { 41 if (m_impl_backend == nullptr) 42 return lldb::ValueObjectSP(); 43 44 return m_impl_backend->ValueObject::Dereference(error); 45 } 46 47 ValueObject *ValueObjectConstResultImpl::CreateChildAtIndex( 48 size_t idx, bool synthetic_array_member, int32_t synthetic_index) { 49 if (m_impl_backend == nullptr) 50 return nullptr; 51 52 m_impl_backend->UpdateValueIfNeeded(false); 53 54 ValueObjectConstResultChild *valobj = nullptr; 55 56 bool omit_empty_base_classes = true; 57 bool ignore_array_bounds = synthetic_array_member; 58 std::string child_name_str; 59 uint32_t child_byte_size = 0; 60 int32_t child_byte_offset = 0; 61 uint32_t child_bitfield_bit_size = 0; 62 uint32_t child_bitfield_bit_offset = 0; 63 bool child_is_base_class = false; 64 bool child_is_deref_of_parent = false; 65 uint64_t language_flags; 66 67 const bool transparent_pointers = !synthetic_array_member; 68 CompilerType compiler_type = m_impl_backend->GetCompilerType(); 69 CompilerType child_compiler_type; 70 71 ExecutionContext exe_ctx(m_impl_backend->GetExecutionContextRef()); 72 73 child_compiler_type = compiler_type.GetChildCompilerTypeAtIndex( 74 &exe_ctx, idx, transparent_pointers, omit_empty_base_classes, 75 ignore_array_bounds, child_name_str, child_byte_size, child_byte_offset, 76 child_bitfield_bit_size, child_bitfield_bit_offset, child_is_base_class, 77 child_is_deref_of_parent, m_impl_backend, language_flags); 78 79 // One might think we should check that the size of the children 80 // is always strictly positive, hence we could avoid creating a 81 // ValueObject if that's not the case, but it turns out there 82 // are languages out there which allow zero-size types with 83 // children (e.g. Swift). 84 if (child_compiler_type) { 85 if (synthetic_index) 86 child_byte_offset += child_byte_size * synthetic_index; 87 88 ConstString child_name; 89 if (!child_name_str.empty()) 90 child_name.SetCString(child_name_str.c_str()); 91 92 valobj = new ValueObjectConstResultChild( 93 *m_impl_backend, child_compiler_type, child_name, child_byte_size, 94 child_byte_offset, child_bitfield_bit_size, child_bitfield_bit_offset, 95 child_is_base_class, child_is_deref_of_parent, 96 m_live_address == LLDB_INVALID_ADDRESS 97 ? m_live_address 98 : m_live_address + child_byte_offset, 99 language_flags); 100 } 101 102 return valobj; 103 } 104 105 lldb::ValueObjectSP ValueObjectConstResultImpl::GetSyntheticChildAtOffset( 106 uint32_t offset, const CompilerType &type, bool can_create, 107 ConstString name_const_str) { 108 if (m_impl_backend == nullptr) 109 return lldb::ValueObjectSP(); 110 111 return m_impl_backend->ValueObject::GetSyntheticChildAtOffset( 112 offset, type, can_create, name_const_str); 113 } 114 115 lldb::ValueObjectSP ValueObjectConstResultImpl::AddressOf(Status &error) { 116 if (m_address_of_backend.get() != nullptr) 117 return m_address_of_backend; 118 119 if (m_impl_backend == nullptr) 120 return lldb::ValueObjectSP(); 121 if (m_live_address != LLDB_INVALID_ADDRESS) { 122 CompilerType compiler_type(m_impl_backend->GetCompilerType()); 123 124 lldb::DataBufferSP buffer(new lldb_private::DataBufferHeap( 125 &m_live_address, sizeof(lldb::addr_t))); 126 127 std::string new_name("&"); 128 new_name.append(m_impl_backend->GetName().AsCString("")); 129 ExecutionContext exe_ctx(m_impl_backend->GetExecutionContextRef()); 130 m_address_of_backend = ValueObjectConstResult::Create( 131 exe_ctx.GetBestExecutionContextScope(), compiler_type.GetPointerType(), 132 ConstString(new_name.c_str()), buffer, endian::InlHostByteOrder(), 133 exe_ctx.GetAddressByteSize()); 134 135 m_address_of_backend->GetValue().SetValueType(Value::ValueType::Scalar); 136 m_address_of_backend->GetValue().GetScalar() = m_live_address; 137 138 return m_address_of_backend; 139 } else 140 return m_impl_backend->ValueObject::AddressOf(error); 141 } 142 143 lldb::ValueObjectSP 144 ValueObjectConstResultImpl::Cast(const CompilerType &compiler_type) { 145 if (m_impl_backend == nullptr) 146 return lldb::ValueObjectSP(); 147 148 ValueObjectConstResultCast *result_cast = 149 new ValueObjectConstResultCast(*m_impl_backend, m_impl_backend->GetName(), 150 compiler_type, m_live_address); 151 return result_cast->GetSP(); 152 } 153 154 lldb::addr_t 155 ValueObjectConstResultImpl::GetAddressOf(bool scalar_is_load_address, 156 AddressType *address_type) { 157 158 if (m_impl_backend == nullptr) 159 return 0; 160 161 if (m_live_address == LLDB_INVALID_ADDRESS) { 162 return m_impl_backend->ValueObject::GetAddressOf(scalar_is_load_address, 163 address_type); 164 } 165 166 if (address_type) 167 *address_type = m_live_address_type; 168 169 return m_live_address; 170 } 171 172 size_t ValueObjectConstResultImpl::GetPointeeData(DataExtractor &data, 173 uint32_t item_idx, 174 uint32_t item_count) { 175 if (m_impl_backend == nullptr) 176 return 0; 177 return m_impl_backend->ValueObject::GetPointeeData(data, item_idx, 178 item_count); 179 } 180