1 //===-- ValueObjectDynamicValue.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/ValueObjectDynamicValue.h"
12
13 // C Includes
14 // C++ Includes
15 // Other libraries and framework includes
16 // Project includes
17 #include "lldb/Core/Log.h"
18 #include "lldb/Core/Module.h"
19 #include "lldb/Core/ValueObjectList.h"
20 #include "lldb/Core/Value.h"
21 #include "lldb/Core/ValueObject.h"
22
23 #include "lldb/Symbol/ClangASTType.h"
24 #include "lldb/Symbol/ObjectFile.h"
25 #include "lldb/Symbol/SymbolContext.h"
26 #include "lldb/Symbol/Type.h"
27 #include "lldb/Symbol/Variable.h"
28
29 #include "lldb/Target/ExecutionContext.h"
30 #include "lldb/Target/LanguageRuntime.h"
31 #include "lldb/Target/Process.h"
32 #include "lldb/Target/RegisterContext.h"
33 #include "lldb/Target/Target.h"
34 #include "lldb/Target/Thread.h"
35
36 using namespace lldb_private;
37
ValueObjectDynamicValue(ValueObject & parent,lldb::DynamicValueType use_dynamic)38 ValueObjectDynamicValue::ValueObjectDynamicValue (ValueObject &parent, lldb::DynamicValueType use_dynamic) :
39 ValueObject(parent),
40 m_address (),
41 m_dynamic_type_info(),
42 m_use_dynamic (use_dynamic)
43 {
44 SetName (parent.GetName());
45 }
46
~ValueObjectDynamicValue()47 ValueObjectDynamicValue::~ValueObjectDynamicValue()
48 {
49 m_owning_valobj_sp.reset();
50 }
51
52 ClangASTType
GetClangTypeImpl()53 ValueObjectDynamicValue::GetClangTypeImpl ()
54 {
55 if (m_dynamic_type_info.HasTypeSP())
56 return m_value.GetClangType();
57 else
58 return m_parent->GetClangType();
59 }
60
61 ConstString
GetTypeName()62 ValueObjectDynamicValue::GetTypeName()
63 {
64 const bool success = UpdateValueIfNeeded(false);
65 if (success)
66 {
67 if (m_dynamic_type_info.HasTypeSP())
68 return GetClangType().GetConstTypeName();
69 if (m_dynamic_type_info.HasName())
70 return m_dynamic_type_info.GetName();
71 }
72 return m_parent->GetTypeName();
73 }
74
75 ConstString
GetQualifiedTypeName()76 ValueObjectDynamicValue::GetQualifiedTypeName()
77 {
78 const bool success = UpdateValueIfNeeded(false);
79 if (success)
80 {
81 if (m_dynamic_type_info.HasTypeSP())
82 return GetClangType().GetConstQualifiedTypeName ();
83 if (m_dynamic_type_info.HasName())
84 return m_dynamic_type_info.GetName();
85 }
86 return m_parent->GetTypeName();
87 }
88
89 size_t
CalculateNumChildren()90 ValueObjectDynamicValue::CalculateNumChildren()
91 {
92 const bool success = UpdateValueIfNeeded(false);
93 if (success && m_dynamic_type_info.HasTypeSP())
94 return GetClangType().GetNumChildren (true);
95 else
96 return m_parent->GetNumChildren();
97 }
98
99 uint64_t
GetByteSize()100 ValueObjectDynamicValue::GetByteSize()
101 {
102 const bool success = UpdateValueIfNeeded(false);
103 if (success && m_dynamic_type_info.HasTypeSP())
104 return m_value.GetValueByteSize(NULL);
105 else
106 return m_parent->GetByteSize();
107 }
108
109 lldb::ValueType
GetValueType() const110 ValueObjectDynamicValue::GetValueType() const
111 {
112 return m_parent->GetValueType();
113 }
114
115 bool
UpdateValue()116 ValueObjectDynamicValue::UpdateValue ()
117 {
118 SetValueIsValid (false);
119 m_error.Clear();
120
121 if (!m_parent->UpdateValueIfNeeded(false))
122 {
123 // The dynamic value failed to get an error, pass the error along
124 if (m_error.Success() && m_parent->GetError().Fail())
125 m_error = m_parent->GetError();
126 return false;
127 }
128
129 // Setting our type_sp to NULL will route everything back through our
130 // parent which is equivalent to not using dynamic values.
131 if (m_use_dynamic == lldb::eNoDynamicValues)
132 {
133 m_dynamic_type_info.Clear();
134 return true;
135 }
136
137 ExecutionContext exe_ctx (GetExecutionContextRef());
138 Target *target = exe_ctx.GetTargetPtr();
139 if (target)
140 {
141 m_data.SetByteOrder(target->GetArchitecture().GetByteOrder());
142 m_data.SetAddressByteSize(target->GetArchitecture().GetAddressByteSize());
143 }
144
145 // First make sure our Type and/or Address haven't changed:
146 Process *process = exe_ctx.GetProcessPtr();
147 if (!process)
148 return false;
149
150 TypeAndOrName class_type_or_name;
151 Address dynamic_address;
152 bool found_dynamic_type = false;
153
154 lldb::LanguageType known_type = m_parent->GetObjectRuntimeLanguage();
155 if (known_type != lldb::eLanguageTypeUnknown && known_type != lldb::eLanguageTypeC)
156 {
157 LanguageRuntime *runtime = process->GetLanguageRuntime (known_type);
158 if (runtime)
159 found_dynamic_type = runtime->GetDynamicTypeAndAddress (*m_parent, m_use_dynamic, class_type_or_name, dynamic_address);
160 }
161 else
162 {
163 LanguageRuntime *cpp_runtime = process->GetLanguageRuntime (lldb::eLanguageTypeC_plus_plus);
164 if (cpp_runtime)
165 found_dynamic_type = cpp_runtime->GetDynamicTypeAndAddress (*m_parent, m_use_dynamic, class_type_or_name, dynamic_address);
166
167 if (!found_dynamic_type)
168 {
169 LanguageRuntime *objc_runtime = process->GetLanguageRuntime (lldb::eLanguageTypeObjC);
170 if (objc_runtime)
171 found_dynamic_type = objc_runtime->GetDynamicTypeAndAddress (*m_parent, m_use_dynamic, class_type_or_name, dynamic_address);
172 }
173 }
174
175 // Getting the dynamic value may have run the program a bit, and so marked us as needing updating, but we really
176 // don't...
177
178 m_update_point.SetUpdated();
179
180 // If we don't have a dynamic type, then make ourselves just a echo of our parent.
181 // Or we could return false, and make ourselves an echo of our parent?
182 if (!found_dynamic_type)
183 {
184 if (m_dynamic_type_info)
185 SetValueDidChange(true);
186 ClearDynamicTypeInformation();
187 m_dynamic_type_info.Clear();
188 m_value = m_parent->GetValue();
189 m_error = m_value.GetValueAsData (&exe_ctx, m_data, 0, GetModule().get());
190 return m_error.Success();
191 }
192
193 Value old_value(m_value);
194
195 Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_TYPES));
196
197 bool has_changed_type = false;
198
199 if (!m_dynamic_type_info)
200 {
201 m_dynamic_type_info = class_type_or_name;
202 has_changed_type = true;
203 }
204 else if (class_type_or_name != m_dynamic_type_info)
205 {
206 // We are another type, we need to tear down our children...
207 m_dynamic_type_info = class_type_or_name;
208 SetValueDidChange (true);
209 has_changed_type = true;
210 }
211
212 if (has_changed_type)
213 ClearDynamicTypeInformation ();
214
215 if (!m_address.IsValid() || m_address != dynamic_address)
216 {
217 if (m_address.IsValid())
218 SetValueDidChange (true);
219
220 // We've moved, so we should be fine...
221 m_address = dynamic_address;
222 lldb::TargetSP target_sp (GetTargetSP());
223 lldb::addr_t load_address = m_address.GetLoadAddress(target_sp.get());
224 m_value.GetScalar() = load_address;
225 }
226
227 ClangASTType corrected_type;
228 if (m_dynamic_type_info.HasTypeSP())
229 {
230 // The type will always be the type of the dynamic object. If our parent's type was a pointer,
231 // then our type should be a pointer to the type of the dynamic object. If a reference, then the original type
232 // should be okay...
233 ClangASTType orig_type = m_dynamic_type_info.GetTypeSP()->GetClangForwardType();
234 corrected_type = orig_type;
235 if (m_parent->IsPointerType())
236 corrected_type = orig_type.GetPointerType ();
237 else if (m_parent->IsPointerOrReferenceType())
238 corrected_type = orig_type.GetLValueReferenceType ();
239 }
240 else /*if (m_dynamic_type_info.HasName())*/
241 {
242 // If we are here we need to adjust our dynamic type name to include the correct & or * symbol
243 std::string type_name_buf (m_dynamic_type_info.GetName().GetCString());
244 if (m_parent->IsPointerType())
245 type_name_buf.append(" *");
246 else if (m_parent->IsPointerOrReferenceType())
247 type_name_buf.append(" &");
248 corrected_type = m_parent->GetClangType();
249 m_dynamic_type_info.SetName(type_name_buf.c_str());
250 }
251
252 //m_value.SetContext (Value::eContextTypeClangType, corrected_type);
253 m_value.SetClangType (corrected_type);
254
255 // Our address is the location of the dynamic type stored in memory. It isn't a load address,
256 // because we aren't pointing to the LOCATION that stores the pointer to us, we're pointing to us...
257 m_value.SetValueType(Value::eValueTypeScalar);
258
259 if (has_changed_type && log)
260 log->Printf("[%s %p] has a new dynamic type %s",
261 GetName().GetCString(),
262 this,
263 GetTypeName().GetCString());
264
265 if (m_address.IsValid() && m_dynamic_type_info)
266 {
267 // The variable value is in the Scalar value inside the m_value.
268 // We can point our m_data right to it.
269 m_error = m_value.GetValueAsData (&exe_ctx, m_data, 0, GetModule().get());
270 if (m_error.Success())
271 {
272 if (GetClangType().IsAggregateType ())
273 {
274 // this value object represents an aggregate type whose
275 // children have values, but this object does not. So we
276 // say we are changed if our location has changed.
277 SetValueDidChange (m_value.GetValueType() != old_value.GetValueType() || m_value.GetScalar() != old_value.GetScalar());
278 }
279
280 SetValueIsValid (true);
281 return true;
282 }
283 }
284
285 // We get here if we've failed above...
286 SetValueIsValid (false);
287 return false;
288 }
289
290
291
292 bool
IsInScope()293 ValueObjectDynamicValue::IsInScope ()
294 {
295 return m_parent->IsInScope();
296 }
297
298 bool
SetValueFromCString(const char * value_str,Error & error)299 ValueObjectDynamicValue::SetValueFromCString (const char *value_str, Error& error)
300 {
301 if (!UpdateValueIfNeeded(false))
302 {
303 error.SetErrorString("unable to read value");
304 return false;
305 }
306
307 uint64_t my_value = GetValueAsUnsigned(UINT64_MAX);
308 uint64_t parent_value = m_parent->GetValueAsUnsigned(UINT64_MAX);
309
310 if (my_value == UINT64_MAX || parent_value == UINT64_MAX)
311 {
312 error.SetErrorString("unable to read value");
313 return false;
314 }
315
316 // if we are at an offset from our parent, in order to set ourselves correctly we would need
317 // to change the new value so that it refers to the correct dynamic type. we choose not to deal
318 // with that - if anything more than a value overwrite is required, you should be using the
319 // expression parser instead of the value editing facility
320 if (my_value != parent_value)
321 {
322 // but NULL'ing out a value should always be allowed
323 if (strcmp(value_str,"0"))
324 {
325 error.SetErrorString("unable to modify dynamic value, use 'expression' command");
326 return false;
327 }
328 }
329
330 bool ret_val = m_parent->SetValueFromCString(value_str,error);
331 SetNeedsUpdate();
332 return ret_val;
333 }
334
335 bool
SetData(DataExtractor & data,Error & error)336 ValueObjectDynamicValue::SetData (DataExtractor &data, Error &error)
337 {
338 if (!UpdateValueIfNeeded(false))
339 {
340 error.SetErrorString("unable to read value");
341 return false;
342 }
343
344 uint64_t my_value = GetValueAsUnsigned(UINT64_MAX);
345 uint64_t parent_value = m_parent->GetValueAsUnsigned(UINT64_MAX);
346
347 if (my_value == UINT64_MAX || parent_value == UINT64_MAX)
348 {
349 error.SetErrorString("unable to read value");
350 return false;
351 }
352
353 // if we are at an offset from our parent, in order to set ourselves correctly we would need
354 // to change the new value so that it refers to the correct dynamic type. we choose not to deal
355 // with that - if anything more than a value overwrite is required, you should be using the
356 // expression parser instead of the value editing facility
357 if (my_value != parent_value)
358 {
359 // but NULL'ing out a value should always be allowed
360 lldb::offset_t offset = 0;
361
362 if (data.GetPointer(&offset) != 0)
363 {
364 error.SetErrorString("unable to modify dynamic value, use 'expression' command");
365 return false;
366 }
367 }
368
369 bool ret_val = m_parent->SetData(data, error);
370 SetNeedsUpdate();
371 return ret_val;
372 }
373