1 //===-- ValueObjectVariable.cpp ---------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 11 #include "lldb/Core/ValueObjectVariable.h" 12 13 // C Includes 14 // C++ Includes 15 // Other libraries and framework includes 16 // Project includes 17 #include "lldb/Core/Module.h" 18 #include "lldb/Core/RegisterValue.h" 19 #include "lldb/Core/ValueObjectList.h" 20 #include "lldb/Core/Value.h" 21 22 #include "lldb/Symbol/Function.h" 23 #include "lldb/Symbol/ObjectFile.h" 24 #include "lldb/Symbol/SymbolContext.h" 25 #include "lldb/Symbol/SymbolContextScope.h" 26 #include "lldb/Symbol/Type.h" 27 #include "lldb/Symbol/Variable.h" 28 29 #include "lldb/Target/ExecutionContext.h" 30 #include "lldb/Target/Process.h" 31 #include "lldb/Target/RegisterContext.h" 32 #include "lldb/Target/Target.h" 33 #include "lldb/Target/Thread.h" 34 35 36 using namespace lldb_private; 37 38 lldb::ValueObjectSP 39 ValueObjectVariable::Create (ExecutionContextScope *exe_scope, const lldb::VariableSP &var_sp) 40 { 41 return (new ValueObjectVariable (exe_scope, var_sp))->GetSP(); 42 } 43 44 ValueObjectVariable::ValueObjectVariable (ExecutionContextScope *exe_scope, const lldb::VariableSP &var_sp) : 45 ValueObject(exe_scope), 46 m_variable_sp(var_sp) 47 { 48 // Do not attempt to construct one of these objects with no variable! 49 assert (m_variable_sp.get() != NULL); 50 m_name = var_sp->GetName(); 51 } 52 53 ValueObjectVariable::~ValueObjectVariable() 54 { 55 } 56 57 ClangASTType 58 ValueObjectVariable::GetClangTypeImpl () 59 { 60 Type *var_type = m_variable_sp->GetType(); 61 if (var_type) 62 return var_type->GetClangForwardType(); 63 return ClangASTType(); 64 } 65 66 ConstString 67 ValueObjectVariable::GetTypeName() 68 { 69 Type * var_type = m_variable_sp->GetType(); 70 if (var_type) 71 return var_type->GetName(); 72 return ConstString(); 73 } 74 75 ConstString 76 ValueObjectVariable::GetQualifiedTypeName() 77 { 78 Type * var_type = m_variable_sp->GetType(); 79 if (var_type) 80 return var_type->GetQualifiedName(); 81 return ConstString(); 82 } 83 84 size_t 85 ValueObjectVariable::CalculateNumChildren() 86 { 87 ClangASTType type(GetClangType()); 88 89 if (!type.IsValid()) 90 return 0; 91 92 const bool omit_empty_base_classes = true; 93 return type.GetNumChildren(omit_empty_base_classes); 94 } 95 96 uint64_t 97 ValueObjectVariable::GetByteSize() 98 { 99 ClangASTType type(GetClangType()); 100 101 if (!type.IsValid()) 102 return 0; 103 104 return type.GetByteSize(); 105 } 106 107 lldb::ValueType 108 ValueObjectVariable::GetValueType() const 109 { 110 if (m_variable_sp) 111 return m_variable_sp->GetScope(); 112 return lldb::eValueTypeInvalid; 113 } 114 115 bool 116 ValueObjectVariable::UpdateValue () 117 { 118 SetValueIsValid (false); 119 m_error.Clear(); 120 121 Variable *variable = m_variable_sp.get(); 122 DWARFExpression &expr = variable->LocationExpression(); 123 124 if (variable->GetLocationIsConstantValueData()) 125 { 126 // expr doesn't contain DWARF bytes, it contains the constant variable 127 // value bytes themselves... 128 if (expr.GetExpressionData(m_data)) 129 m_value.SetContext(Value::eContextTypeVariable, variable); 130 else 131 m_error.SetErrorString ("empty constant data"); 132 // constant bytes can't be edited - sorry 133 m_resolved_value.SetContext(Value::eContextTypeInvalid, NULL); 134 } 135 else 136 { 137 lldb::addr_t loclist_base_load_addr = LLDB_INVALID_ADDRESS; 138 ExecutionContext exe_ctx (GetExecutionContextRef()); 139 140 Target *target = exe_ctx.GetTargetPtr(); 141 if (target) 142 { 143 m_data.SetByteOrder(target->GetArchitecture().GetByteOrder()); 144 m_data.SetAddressByteSize(target->GetArchitecture().GetAddressByteSize()); 145 } 146 147 if (expr.IsLocationList()) 148 { 149 SymbolContext sc; 150 variable->CalculateSymbolContext (&sc); 151 if (sc.function) 152 loclist_base_load_addr = sc.function->GetAddressRange().GetBaseAddress().GetLoadAddress (target); 153 } 154 Value old_value(m_value); 155 if (expr.Evaluate (&exe_ctx, NULL, NULL, NULL, loclist_base_load_addr, NULL, m_value, &m_error)) 156 { 157 m_resolved_value = m_value; 158 m_value.SetContext(Value::eContextTypeVariable, variable); 159 160 Value::ValueType value_type = m_value.GetValueType(); 161 162 switch (value_type) 163 { 164 case Value::eValueTypeFileAddress: 165 SetAddressTypeOfChildren(eAddressTypeFile); 166 break; 167 case Value::eValueTypeHostAddress: 168 SetAddressTypeOfChildren(eAddressTypeHost); 169 break; 170 case Value::eValueTypeLoadAddress: 171 case Value::eValueTypeScalar: 172 case Value::eValueTypeVector: 173 SetAddressTypeOfChildren(eAddressTypeLoad); 174 break; 175 } 176 177 switch (value_type) 178 { 179 case Value::eValueTypeVector: 180 // fall through 181 case Value::eValueTypeScalar: 182 // The variable value is in the Scalar value inside the m_value. 183 // We can point our m_data right to it. 184 m_error = m_value.GetValueAsData (&exe_ctx, m_data, 0, GetModule().get()); 185 break; 186 187 case Value::eValueTypeFileAddress: 188 case Value::eValueTypeLoadAddress: 189 case Value::eValueTypeHostAddress: 190 // The DWARF expression result was an address in the inferior 191 // process. If this variable is an aggregate type, we just need 192 // the address as the main value as all child variable objects 193 // will rely upon this location and add an offset and then read 194 // their own values as needed. If this variable is a simple 195 // type, we read all data for it into m_data. 196 // Make sure this type has a value before we try and read it 197 198 // If we have a file address, convert it to a load address if we can. 199 Process *process = exe_ctx.GetProcessPtr(); 200 if (value_type == Value::eValueTypeFileAddress && process && process->IsAlive()) 201 { 202 lldb::addr_t file_addr = m_value.GetScalar().ULongLong(LLDB_INVALID_ADDRESS); 203 if (file_addr != LLDB_INVALID_ADDRESS) 204 { 205 SymbolContext var_sc; 206 variable->CalculateSymbolContext(&var_sc); 207 if (var_sc.module_sp) 208 { 209 ObjectFile *objfile = var_sc.module_sp->GetObjectFile(); 210 if (objfile) 211 { 212 Address so_addr(file_addr, objfile->GetSectionList()); 213 lldb::addr_t load_addr = so_addr.GetLoadAddress (target); 214 if (load_addr != LLDB_INVALID_ADDRESS) 215 { 216 m_value.SetValueType(Value::eValueTypeLoadAddress); 217 m_value.GetScalar() = load_addr; 218 } 219 } 220 } 221 } 222 } 223 224 if (GetClangType().IsAggregateType()) 225 { 226 // this value object represents an aggregate type whose 227 // children have values, but this object does not. So we 228 // say we are changed if our location has changed. 229 SetValueDidChange (value_type != old_value.GetValueType() || m_value.GetScalar() != old_value.GetScalar()); 230 } 231 else 232 { 233 // Copy the Value and set the context to use our Variable 234 // so it can extract read its value into m_data appropriately 235 Value value(m_value); 236 value.SetContext(Value::eContextTypeVariable, variable); 237 m_error = value.GetValueAsData(&exe_ctx, m_data, 0, GetModule().get()); 238 } 239 break; 240 } 241 242 SetValueIsValid (m_error.Success()); 243 } 244 else 245 { 246 // could not find location, won't allow editing 247 m_resolved_value.SetContext(Value::eContextTypeInvalid, NULL); 248 } 249 } 250 return m_error.Success(); 251 } 252 253 254 255 bool 256 ValueObjectVariable::IsInScope () 257 { 258 const ExecutionContextRef &exe_ctx_ref = GetExecutionContextRef(); 259 if (exe_ctx_ref.HasFrameRef()) 260 { 261 ExecutionContext exe_ctx (exe_ctx_ref); 262 StackFrame *frame = exe_ctx.GetFramePtr(); 263 if (frame) 264 { 265 return m_variable_sp->IsInScope (frame); 266 } 267 else 268 { 269 // This ValueObject had a frame at one time, but now we 270 // can't locate it, so return false since we probably aren't 271 // in scope. 272 return false; 273 } 274 } 275 // We have a variable that wasn't tied to a frame, which 276 // means it is a global and is always in scope. 277 return true; 278 279 } 280 281 lldb::ModuleSP 282 ValueObjectVariable::GetModule() 283 { 284 if (m_variable_sp) 285 { 286 SymbolContextScope *sc_scope = m_variable_sp->GetSymbolContextScope(); 287 if (sc_scope) 288 { 289 return sc_scope->CalculateSymbolContextModule(); 290 } 291 } 292 return lldb::ModuleSP(); 293 } 294 295 SymbolContextScope * 296 ValueObjectVariable::GetSymbolContextScope() 297 { 298 if (m_variable_sp) 299 return m_variable_sp->GetSymbolContextScope(); 300 return NULL; 301 } 302 303 bool 304 ValueObjectVariable::GetDeclaration (Declaration &decl) 305 { 306 if (m_variable_sp) 307 { 308 decl = m_variable_sp->GetDeclaration(); 309 return true; 310 } 311 return false; 312 } 313 314 const char * 315 ValueObjectVariable::GetLocationAsCString () 316 { 317 if (m_resolved_value.GetContextType() == Value::eContextTypeRegisterInfo) 318 return GetLocationAsCStringImpl(m_resolved_value, 319 m_data); 320 else 321 return ValueObject::GetLocationAsCString(); 322 } 323 324 bool 325 ValueObjectVariable::SetValueFromCString (const char *value_str, Error& error) 326 { 327 if (m_resolved_value.GetContextType() == Value::eContextTypeRegisterInfo) 328 { 329 RegisterInfo *reg_info = m_resolved_value.GetRegisterInfo(); 330 ExecutionContext exe_ctx(GetExecutionContextRef()); 331 RegisterContext *reg_ctx = exe_ctx.GetRegisterContext(); 332 RegisterValue reg_value; 333 if (!reg_info || !reg_ctx) 334 { 335 error.SetErrorString("unable to retrieve register info"); 336 return false; 337 } 338 error = reg_value.SetValueFromCString(reg_info, value_str); 339 if (error.Fail()) 340 return false; 341 if (reg_ctx->WriteRegister (reg_info, reg_value)) 342 { 343 SetNeedsUpdate(); 344 return true; 345 } 346 else 347 { 348 error.SetErrorString("unable to write back to register"); 349 return false; 350 } 351 } 352 else 353 return ValueObject::SetValueFromCString(value_str, error); 354 } 355 356 bool 357 ValueObjectVariable::SetData (DataExtractor &data, Error &error) 358 { 359 if (m_resolved_value.GetContextType() == Value::eContextTypeRegisterInfo) 360 { 361 RegisterInfo *reg_info = m_resolved_value.GetRegisterInfo(); 362 ExecutionContext exe_ctx(GetExecutionContextRef()); 363 RegisterContext *reg_ctx = exe_ctx.GetRegisterContext(); 364 RegisterValue reg_value; 365 if (!reg_info || !reg_ctx) 366 { 367 error.SetErrorString("unable to retrieve register info"); 368 return false; 369 } 370 error = reg_value.SetValueFromData(reg_info, data, 0, false); 371 if (error.Fail()) 372 return false; 373 if (reg_ctx->WriteRegister (reg_info, reg_value)) 374 { 375 SetNeedsUpdate(); 376 return true; 377 } 378 else 379 { 380 error.SetErrorString("unable to write back to register"); 381 return false; 382 } 383 } 384 else 385 return ValueObject::SetData(data, error); 386 } 387
