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 
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 
47 ValueObjectDynamicValue::~ValueObjectDynamicValue()
48 {
49     m_owning_valobj_sp.reset();
50 }
51 
52 ClangASTType
53 ValueObjectDynamicValue::GetClangTypeImpl ()
54 {
55     const bool success = UpdateValueIfNeeded(false);
56     if (success)
57     {
58         if (m_dynamic_type_info.HasType())
59             return m_value.GetClangType();
60         else
61             return m_parent->GetClangType();
62     }
63     return m_parent->GetClangType();
64 }
65 
66 ConstString
67 ValueObjectDynamicValue::GetTypeName()
68 {
69     const bool success = UpdateValueIfNeeded(false);
70     if (success)
71     {
72         if (m_dynamic_type_info.HasName())
73             return m_dynamic_type_info.GetName();
74     }
75     return m_parent->GetTypeName();
76 }
77 
78 TypeImpl
79 ValueObjectDynamicValue::GetTypeImpl ()
80 {
81     const bool success = UpdateValueIfNeeded(false);
82     if (success && m_type_impl.IsValid())
83     {
84         return m_type_impl;
85     }
86     return m_parent->GetTypeImpl();
87 }
88 
89 ConstString
90 ValueObjectDynamicValue::GetQualifiedTypeName()
91 {
92     const bool success = UpdateValueIfNeeded(false);
93     if (success)
94     {
95         if (m_dynamic_type_info.HasName())
96             return m_dynamic_type_info.GetName();
97     }
98     return m_parent->GetQualifiedTypeName();
99 }
100 
101 ConstString
102 ValueObjectDynamicValue::GetDisplayTypeName()
103 {
104     const bool success = UpdateValueIfNeeded(false);
105     if (success)
106     {
107         if (m_dynamic_type_info.HasType())
108             return GetClangType().GetDisplayTypeName();
109         if (m_dynamic_type_info.HasName())
110             return m_dynamic_type_info.GetName();
111     }
112     return m_parent->GetDisplayTypeName();
113 }
114 
115 size_t
116 ValueObjectDynamicValue::CalculateNumChildren()
117 {
118     const bool success = UpdateValueIfNeeded(false);
119     if (success && m_dynamic_type_info.HasType())
120         return GetClangType().GetNumChildren (true);
121     else
122         return m_parent->GetNumChildren();
123 }
124 
125 uint64_t
126 ValueObjectDynamicValue::GetByteSize()
127 {
128     const bool success = UpdateValueIfNeeded(false);
129     if (success && m_dynamic_type_info.HasType())
130         return m_value.GetValueByteSize(nullptr);
131     else
132         return m_parent->GetByteSize();
133 }
134 
135 lldb::ValueType
136 ValueObjectDynamicValue::GetValueType() const
137 {
138     return m_parent->GetValueType();
139 }
140 
141 
142 static TypeAndOrName
143 FixupTypeAndOrName (const TypeAndOrName& type_andor_name,
144                     ValueObject& parent)
145 {
146     TypeAndOrName ret(type_andor_name);
147     if (type_andor_name.HasType())
148     {
149         // The type will always be the type of the dynamic object.  If our parent's type was a pointer,
150         // then our type should be a pointer to the type of the dynamic object.  If a reference, then the original type
151         // should be okay...
152         ClangASTType orig_type = type_andor_name.GetClangASTType();
153         ClangASTType corrected_type = orig_type;
154         if (parent.IsPointerType())
155             corrected_type = orig_type.GetPointerType ();
156         else if (parent.IsPointerOrReferenceType())
157             corrected_type = orig_type.GetLValueReferenceType ();
158         ret.SetClangASTType(corrected_type);
159     }
160     else /*if (m_dynamic_type_info.HasName())*/
161     {
162         // If we are here we need to adjust our dynamic type name to include the correct & or * symbol
163         std::string corrected_name (type_andor_name.GetName().GetCString());
164         if (parent.IsPointerType())
165             corrected_name.append(" *");
166         else if (parent.IsPointerOrReferenceType())
167             corrected_name.append(" &");
168         // the parent type should be a correctly pointer'ed or referenc'ed type
169         ret.SetClangASTType(parent.GetClangType());
170         ret.SetName(corrected_name.c_str());
171     }
172     return ret;
173 }
174 
175 bool
176 ValueObjectDynamicValue::UpdateValue ()
177 {
178     SetValueIsValid (false);
179     m_error.Clear();
180 
181     if (!m_parent->UpdateValueIfNeeded(false))
182     {
183         // The dynamic value failed to get an error, pass the error along
184         if (m_error.Success() && m_parent->GetError().Fail())
185             m_error = m_parent->GetError();
186         return false;
187     }
188 
189     // Setting our type_sp to NULL will route everything back through our
190     // parent which is equivalent to not using dynamic values.
191     if (m_use_dynamic == lldb::eNoDynamicValues)
192     {
193         m_dynamic_type_info.Clear();
194         return true;
195     }
196 
197     ExecutionContext exe_ctx (GetExecutionContextRef());
198     Target *target = exe_ctx.GetTargetPtr();
199     if (target)
200     {
201         m_data.SetByteOrder(target->GetArchitecture().GetByteOrder());
202         m_data.SetAddressByteSize(target->GetArchitecture().GetAddressByteSize());
203     }
204 
205     // First make sure our Type and/or Address haven't changed:
206     Process *process = exe_ctx.GetProcessPtr();
207     if (!process)
208         return false;
209 
210     TypeAndOrName class_type_or_name;
211     Address dynamic_address;
212     bool found_dynamic_type = false;
213 
214     lldb::LanguageType known_type = m_parent->GetObjectRuntimeLanguage();
215     if (known_type != lldb::eLanguageTypeUnknown && known_type != lldb::eLanguageTypeC)
216     {
217         LanguageRuntime *runtime = process->GetLanguageRuntime (known_type);
218         if (runtime)
219             found_dynamic_type = runtime->GetDynamicTypeAndAddress (*m_parent, m_use_dynamic, class_type_or_name, dynamic_address);
220     }
221     else
222     {
223         LanguageRuntime *cpp_runtime = process->GetLanguageRuntime (lldb::eLanguageTypeC_plus_plus);
224         if (cpp_runtime)
225             found_dynamic_type = cpp_runtime->GetDynamicTypeAndAddress (*m_parent, m_use_dynamic, class_type_or_name, dynamic_address);
226 
227         if (!found_dynamic_type)
228         {
229             LanguageRuntime *objc_runtime = process->GetLanguageRuntime (lldb::eLanguageTypeObjC);
230             if (objc_runtime)
231                 found_dynamic_type = objc_runtime->GetDynamicTypeAndAddress (*m_parent, m_use_dynamic, class_type_or_name, dynamic_address);
232         }
233     }
234 
235     // Getting the dynamic value may have run the program a bit, and so marked us as needing updating, but we really
236     // don't...
237 
238     m_update_point.SetUpdated();
239 
240     if (found_dynamic_type)
241     {
242         if (class_type_or_name.HasType())
243         {
244             m_type_impl = TypeImpl(m_parent->GetClangType(),FixupTypeAndOrName(class_type_or_name, *m_parent).GetClangASTType());
245         }
246         else
247         {
248             m_type_impl.Clear();
249         }
250     }
251     else
252     {
253         m_type_impl.Clear();
254     }
255 
256     // If we don't have a dynamic type, then make ourselves just a echo of our parent.
257     // Or we could return false, and make ourselves an echo of our parent?
258     if (!found_dynamic_type)
259     {
260         if (m_dynamic_type_info)
261             SetValueDidChange(true);
262         ClearDynamicTypeInformation();
263         m_dynamic_type_info.Clear();
264         m_value = m_parent->GetValue();
265         m_error = m_value.GetValueAsData (&exe_ctx, m_data, 0, GetModule().get());
266         return m_error.Success();
267     }
268 
269     Value old_value(m_value);
270 
271     Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_TYPES));
272 
273     bool has_changed_type = false;
274 
275     if (!m_dynamic_type_info)
276     {
277         m_dynamic_type_info = class_type_or_name;
278         has_changed_type = true;
279     }
280     else if (class_type_or_name != m_dynamic_type_info)
281     {
282         // We are another type, we need to tear down our children...
283         m_dynamic_type_info = class_type_or_name;
284         SetValueDidChange (true);
285         has_changed_type = true;
286     }
287 
288     if (has_changed_type)
289         ClearDynamicTypeInformation ();
290 
291     if (!m_address.IsValid() || m_address != dynamic_address)
292     {
293         if (m_address.IsValid())
294             SetValueDidChange (true);
295 
296         // We've moved, so we should be fine...
297         m_address = dynamic_address;
298         lldb::TargetSP target_sp (GetTargetSP());
299         lldb::addr_t load_address = m_address.GetLoadAddress(target_sp.get());
300         m_value.GetScalar() = load_address;
301     }
302 
303     m_dynamic_type_info = FixupTypeAndOrName(m_dynamic_type_info, *m_parent);
304 
305     //m_value.SetContext (Value::eContextTypeClangType, corrected_type);
306     m_value.SetClangType (m_dynamic_type_info.GetClangASTType());
307 
308     // Our address is the location of the dynamic type stored in memory.  It isn't a load address,
309     // because we aren't pointing to the LOCATION that stores the pointer to us, we're pointing to us...
310     m_value.SetValueType(Value::eValueTypeScalar);
311 
312     if (has_changed_type && log)
313         log->Printf("[%s %p] has a new dynamic type %s", GetName().GetCString(),
314                     static_cast<void*>(this), GetTypeName().GetCString());
315 
316     if (m_address.IsValid() && m_dynamic_type_info)
317     {
318         // The variable value is in the Scalar value inside the m_value.
319         // We can point our m_data right to it.
320         m_error = m_value.GetValueAsData (&exe_ctx, m_data, 0, GetModule().get());
321         if (m_error.Success())
322         {
323             if (!CanProvideValue())
324             {
325                 // this value object represents an aggregate type whose
326                 // children have values, but this object does not. So we
327                 // say we are changed if our location has changed.
328                 SetValueDidChange (m_value.GetValueType() != old_value.GetValueType() || m_value.GetScalar() != old_value.GetScalar());
329             }
330 
331             SetValueIsValid (true);
332             return true;
333         }
334     }
335 
336     // We get here if we've failed above...
337     SetValueIsValid (false);
338     return false;
339 }
340 
341 
342 
343 bool
344 ValueObjectDynamicValue::IsInScope ()
345 {
346     return m_parent->IsInScope();
347 }
348 
349 bool
350 ValueObjectDynamicValue::SetValueFromCString (const char *value_str, Error& error)
351 {
352     if (!UpdateValueIfNeeded(false))
353     {
354         error.SetErrorString("unable to read value");
355         return false;
356     }
357 
358     uint64_t my_value = GetValueAsUnsigned(UINT64_MAX);
359     uint64_t parent_value = m_parent->GetValueAsUnsigned(UINT64_MAX);
360 
361     if (my_value == UINT64_MAX || parent_value == UINT64_MAX)
362     {
363         error.SetErrorString("unable to read value");
364         return false;
365     }
366 
367     // if we are at an offset from our parent, in order to set ourselves correctly we would need
368     // to change the new value so that it refers to the correct dynamic type. we choose not to deal
369     // with that - if anything more than a value overwrite is required, you should be using the
370     // expression parser instead of the value editing facility
371     if (my_value != parent_value)
372     {
373         // but NULL'ing out a value should always be allowed
374         if (strcmp(value_str,"0"))
375         {
376             error.SetErrorString("unable to modify dynamic value, use 'expression' command");
377             return false;
378         }
379     }
380 
381     bool ret_val = m_parent->SetValueFromCString(value_str,error);
382     SetNeedsUpdate();
383     return ret_val;
384 }
385 
386 bool
387 ValueObjectDynamicValue::SetData (DataExtractor &data, Error &error)
388 {
389     if (!UpdateValueIfNeeded(false))
390     {
391         error.SetErrorString("unable to read value");
392         return false;
393     }
394 
395     uint64_t my_value = GetValueAsUnsigned(UINT64_MAX);
396     uint64_t parent_value = m_parent->GetValueAsUnsigned(UINT64_MAX);
397 
398     if (my_value == UINT64_MAX || parent_value == UINT64_MAX)
399     {
400         error.SetErrorString("unable to read value");
401         return false;
402     }
403 
404     // if we are at an offset from our parent, in order to set ourselves correctly we would need
405     // to change the new value so that it refers to the correct dynamic type. we choose not to deal
406     // with that - if anything more than a value overwrite is required, you should be using the
407     // expression parser instead of the value editing facility
408     if (my_value != parent_value)
409     {
410         // but NULL'ing out a value should always be allowed
411         lldb::offset_t offset = 0;
412 
413         if (data.GetPointer(&offset) != 0)
414         {
415             error.SetErrorString("unable to modify dynamic value, use 'expression' command");
416             return false;
417         }
418     }
419 
420     bool ret_val = m_parent->SetData(data, error);
421     SetNeedsUpdate();
422     return ret_val;
423 }
424