1 //===-- ValueObjectMemory.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/ValueObjectMemory.h" 10 #include "lldb/Core/Value.h" 11 #include "lldb/Core/ValueObject.h" 12 #include "lldb/Symbol/Type.h" 13 #include "lldb/Target/ExecutionContext.h" 14 #include "lldb/Target/Target.h" 15 #include "lldb/Utility/DataExtractor.h" 16 #include "lldb/Utility/Scalar.h" 17 #include "lldb/Utility/Status.h" 18 #include "lldb/lldb-types.h" 19 #include "llvm/Support/ErrorHandling.h" 20 21 #include <assert.h> 22 #include <memory> 23 24 namespace lldb_private { 25 class ExecutionContextScope; 26 } 27 28 using namespace lldb; 29 using namespace lldb_private; 30 31 ValueObjectSP ValueObjectMemory::Create(ExecutionContextScope *exe_scope, 32 llvm::StringRef name, 33 const Address &address, 34 lldb::TypeSP &type_sp) { 35 auto manager_sp = ValueObjectManager::Create(); 36 return (new ValueObjectMemory(exe_scope, *manager_sp, name, address, type_sp)) 37 ->GetSP(); 38 } 39 40 ValueObjectSP ValueObjectMemory::Create(ExecutionContextScope *exe_scope, 41 llvm::StringRef name, 42 const Address &address, 43 const CompilerType &ast_type) { 44 auto manager_sp = ValueObjectManager::Create(); 45 return (new ValueObjectMemory(exe_scope, *manager_sp, name, address, 46 ast_type)) 47 ->GetSP(); 48 } 49 50 ValueObjectMemory::ValueObjectMemory(ExecutionContextScope *exe_scope, 51 ValueObjectManager &manager, 52 llvm::StringRef name, 53 const Address &address, 54 lldb::TypeSP &type_sp) 55 : ValueObject(exe_scope, manager), m_address(address), m_type_sp(type_sp), 56 m_compiler_type() { 57 // Do not attempt to construct one of these objects with no variable! 58 assert(m_type_sp.get() != nullptr); 59 SetName(ConstString(name)); 60 m_value.SetContext(Value::eContextTypeLLDBType, m_type_sp.get()); 61 TargetSP target_sp(GetTargetSP()); 62 lldb::addr_t load_address = m_address.GetLoadAddress(target_sp.get()); 63 if (load_address != LLDB_INVALID_ADDRESS) { 64 m_value.SetValueType(Value::eValueTypeLoadAddress); 65 m_value.GetScalar() = load_address; 66 } else { 67 lldb::addr_t file_address = m_address.GetFileAddress(); 68 if (file_address != LLDB_INVALID_ADDRESS) { 69 m_value.SetValueType(Value::eValueTypeFileAddress); 70 m_value.GetScalar() = file_address; 71 } else { 72 m_value.GetScalar() = m_address.GetOffset(); 73 m_value.SetValueType(Value::eValueTypeScalar); 74 } 75 } 76 } 77 78 ValueObjectMemory::ValueObjectMemory(ExecutionContextScope *exe_scope, 79 ValueObjectManager &manager, 80 llvm::StringRef name, 81 const Address &address, 82 const CompilerType &ast_type) 83 : ValueObject(exe_scope, manager), m_address(address), m_type_sp(), 84 m_compiler_type(ast_type) { 85 // Do not attempt to construct one of these objects with no variable! 86 assert(m_compiler_type.GetTypeSystem()); 87 assert(m_compiler_type.GetOpaqueQualType()); 88 89 TargetSP target_sp(GetTargetSP()); 90 91 SetName(ConstString(name)); 92 m_value.SetCompilerType(m_compiler_type); 93 lldb::addr_t load_address = m_address.GetLoadAddress(target_sp.get()); 94 if (load_address != LLDB_INVALID_ADDRESS) { 95 m_value.SetValueType(Value::eValueTypeLoadAddress); 96 m_value.GetScalar() = load_address; 97 } else { 98 lldb::addr_t file_address = m_address.GetFileAddress(); 99 if (file_address != LLDB_INVALID_ADDRESS) { 100 m_value.SetValueType(Value::eValueTypeFileAddress); 101 m_value.GetScalar() = file_address; 102 } else { 103 m_value.GetScalar() = m_address.GetOffset(); 104 m_value.SetValueType(Value::eValueTypeScalar); 105 } 106 } 107 } 108 109 ValueObjectMemory::~ValueObjectMemory() {} 110 111 CompilerType ValueObjectMemory::GetCompilerTypeImpl() { 112 if (m_type_sp) 113 return m_type_sp->GetForwardCompilerType(); 114 return m_compiler_type; 115 } 116 117 ConstString ValueObjectMemory::GetTypeName() { 118 if (m_type_sp) 119 return m_type_sp->GetName(); 120 return m_compiler_type.GetTypeName(); 121 } 122 123 ConstString ValueObjectMemory::GetDisplayTypeName() { 124 if (m_type_sp) 125 return m_type_sp->GetForwardCompilerType().GetDisplayTypeName(); 126 return m_compiler_type.GetDisplayTypeName(); 127 } 128 129 size_t ValueObjectMemory::CalculateNumChildren(uint32_t max) { 130 if (m_type_sp) { 131 auto child_count = m_type_sp->GetNumChildren(true); 132 return child_count <= max ? child_count : max; 133 } 134 135 ExecutionContext exe_ctx(GetExecutionContextRef()); 136 const bool omit_empty_base_classes = true; 137 auto child_count = 138 m_compiler_type.GetNumChildren(omit_empty_base_classes, &exe_ctx); 139 return child_count <= max ? child_count : max; 140 } 141 142 uint64_t ValueObjectMemory::GetByteSize() { 143 if (m_type_sp) 144 return m_type_sp->GetByteSize().getValueOr(0); 145 return m_compiler_type.GetByteSize(nullptr).getValueOr(0); 146 } 147 148 lldb::ValueType ValueObjectMemory::GetValueType() const { 149 // RETHINK: Should this be inherited from somewhere? 150 return lldb::eValueTypeVariableGlobal; 151 } 152 153 bool ValueObjectMemory::UpdateValue() { 154 SetValueIsValid(false); 155 m_error.Clear(); 156 157 ExecutionContext exe_ctx(GetExecutionContextRef()); 158 159 Target *target = exe_ctx.GetTargetPtr(); 160 if (target) { 161 m_data.SetByteOrder(target->GetArchitecture().GetByteOrder()); 162 m_data.SetAddressByteSize(target->GetArchitecture().GetAddressByteSize()); 163 } 164 165 Value old_value(m_value); 166 if (m_address.IsValid()) { 167 Value::ValueType value_type = m_value.GetValueType(); 168 169 switch (value_type) { 170 default: 171 llvm_unreachable("Unhandled expression result value kind..."); 172 173 case Value::eValueTypeScalar: 174 // The variable value is in the Scalar value inside the m_value. We can 175 // point our m_data right to it. 176 m_error = m_value.GetValueAsData(&exe_ctx, m_data, GetModule().get()); 177 break; 178 179 case Value::eValueTypeFileAddress: 180 case Value::eValueTypeLoadAddress: 181 case Value::eValueTypeHostAddress: 182 // The DWARF expression result was an address in the inferior process. If 183 // this variable is an aggregate type, we just need the address as the 184 // main value as all child variable objects will rely upon this location 185 // and add an offset and then read their own values as needed. If this 186 // variable is a simple type, we read all data for it into m_data. Make 187 // sure this type has a value before we try and read it 188 189 // If we have a file address, convert it to a load address if we can. 190 if (value_type == Value::eValueTypeFileAddress && 191 exe_ctx.GetProcessPtr()) { 192 lldb::addr_t load_addr = m_address.GetLoadAddress(target); 193 if (load_addr != LLDB_INVALID_ADDRESS) { 194 m_value.SetValueType(Value::eValueTypeLoadAddress); 195 m_value.GetScalar() = load_addr; 196 } 197 } 198 199 if (!CanProvideValue()) { 200 // this value object represents an aggregate type whose children have 201 // values, but this object does not. So we say we are changed if our 202 // location has changed. 203 SetValueDidChange(value_type != old_value.GetValueType() || 204 m_value.GetScalar() != old_value.GetScalar()); 205 } else { 206 // Copy the Value and set the context to use our Variable so it can 207 // extract read its value into m_data appropriately 208 Value value(m_value); 209 if (m_type_sp) 210 value.SetContext(Value::eContextTypeLLDBType, m_type_sp.get()); 211 else { 212 value.SetCompilerType(m_compiler_type); 213 } 214 215 m_error = value.GetValueAsData(&exe_ctx, m_data, GetModule().get()); 216 } 217 break; 218 } 219 220 SetValueIsValid(m_error.Success()); 221 } 222 return m_error.Success(); 223 } 224 225 bool ValueObjectMemory::IsInScope() { 226 // FIXME: Maybe try to read the memory address, and if that works, then 227 // we are in scope? 228 return true; 229 } 230 231 lldb::ModuleSP ValueObjectMemory::GetModule() { return m_address.GetModule(); } 232