1 //===-- ValueObject.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 #include "lldb/Core/ValueObject.h"
11 
12 // C Includes
13 #include <stdlib.h>
14 
15 // C++ Includes
16 // Other libraries and framework includes
17 #include "llvm/Support/raw_ostream.h"
18 #include "clang/AST/Type.h"
19 
20 // Project includes
21 #include "lldb/Core/DataBufferHeap.h"
22 #include "lldb/Core/DataVisualization.h"
23 #include "lldb/Core/Debugger.h"
24 #include "lldb/Core/Log.h"
25 #include "lldb/Core/StreamString.h"
26 #include "lldb/Core/ValueObjectChild.h"
27 #include "lldb/Core/ValueObjectConstResult.h"
28 #include "lldb/Core/ValueObjectDynamicValue.h"
29 #include "lldb/Core/ValueObjectList.h"
30 #include "lldb/Core/ValueObjectMemory.h"
31 #include "lldb/Core/ValueObjectSyntheticFilter.h"
32 
33 #include "lldb/Host/Endian.h"
34 
35 #include "lldb/Interpreter/CommandInterpreter.h"
36 #include "lldb/Interpreter/ScriptInterpreterPython.h"
37 
38 #include "lldb/Symbol/ClangASTType.h"
39 #include "lldb/Symbol/ClangASTContext.h"
40 #include "lldb/Symbol/Type.h"
41 
42 #include "lldb/Target/ExecutionContext.h"
43 #include "lldb/Target/LanguageRuntime.h"
44 #include "lldb/Target/ObjCLanguageRuntime.h"
45 #include "lldb/Target/Process.h"
46 #include "lldb/Target/RegisterContext.h"
47 #include "lldb/Target/Target.h"
48 #include "lldb/Target/Thread.h"
49 
50 #include "lldb/Utility/RefCounter.h"
51 
52 using namespace lldb;
53 using namespace lldb_private;
54 using namespace lldb_utility;
55 
56 static user_id_t g_value_obj_uid = 0;
57 
58 //----------------------------------------------------------------------
59 // ValueObject constructor
60 //----------------------------------------------------------------------
61 ValueObject::ValueObject (ValueObject &parent) :
62     UserID (++g_value_obj_uid), // Unique identifier for every value object
63     m_parent (&parent),
64     m_update_point (parent.GetUpdatePoint ()),
65     m_name (),
66     m_data (),
67     m_value (),
68     m_error (),
69     m_value_str (),
70     m_old_value_str (),
71     m_location_str (),
72     m_summary_str (),
73     m_object_desc_str (),
74     m_manager(parent.GetManager()),
75     m_children (),
76     m_synthetic_children (),
77     m_dynamic_value (NULL),
78     m_synthetic_value(NULL),
79     m_deref_valobj(NULL),
80     m_format (eFormatDefault),
81     m_last_format_mgr_revision(0),
82     m_last_format_mgr_dynamic(parent.m_last_format_mgr_dynamic),
83     m_last_summary_format(),
84     m_forced_summary_format(),
85     m_last_value_format(),
86     m_last_synthetic_filter(),
87     m_user_id_of_forced_summary(),
88     m_address_type_of_ptr_or_ref_children(eAddressTypeInvalid),
89     m_value_is_valid (false),
90     m_value_did_change (false),
91     m_children_count_valid (false),
92     m_old_value_valid (false),
93     m_is_deref_of_parent (false),
94     m_is_array_item_for_pointer(false),
95     m_is_bitfield_for_scalar(false),
96     m_is_expression_path_child(false),
97     m_is_child_at_offset(false),
98     m_is_getting_summary(false)
99 {
100     m_manager->ManageObject(this);
101 }
102 
103 //----------------------------------------------------------------------
104 // ValueObject constructor
105 //----------------------------------------------------------------------
106 ValueObject::ValueObject (ExecutionContextScope *exe_scope,
107                           AddressType child_ptr_or_ref_addr_type) :
108     UserID (++g_value_obj_uid), // Unique identifier for every value object
109     m_parent (NULL),
110     m_update_point (exe_scope),
111     m_name (),
112     m_data (),
113     m_value (),
114     m_error (),
115     m_value_str (),
116     m_old_value_str (),
117     m_location_str (),
118     m_summary_str (),
119     m_object_desc_str (),
120     m_manager(),
121     m_children (),
122     m_synthetic_children (),
123     m_dynamic_value (NULL),
124     m_synthetic_value(NULL),
125     m_deref_valobj(NULL),
126     m_format (eFormatDefault),
127     m_last_format_mgr_revision(0),
128     m_last_format_mgr_dynamic(eNoDynamicValues),
129     m_last_summary_format(),
130     m_forced_summary_format(),
131     m_last_value_format(),
132     m_last_synthetic_filter(),
133     m_user_id_of_forced_summary(),
134     m_address_type_of_ptr_or_ref_children(child_ptr_or_ref_addr_type),
135     m_value_is_valid (false),
136     m_value_did_change (false),
137     m_children_count_valid (false),
138     m_old_value_valid (false),
139     m_is_deref_of_parent (false),
140     m_is_array_item_for_pointer(false),
141     m_is_bitfield_for_scalar(false),
142     m_is_expression_path_child(false),
143     m_is_child_at_offset(false),
144     m_is_getting_summary(false)
145 {
146     m_manager = new ValueObjectManager();
147     m_manager->ManageObject (this);
148 }
149 
150 //----------------------------------------------------------------------
151 // Destructor
152 //----------------------------------------------------------------------
153 ValueObject::~ValueObject ()
154 {
155 }
156 
157 bool
158 ValueObject::UpdateValueIfNeeded (bool update_format)
159 {
160     return UpdateValueIfNeeded(m_last_format_mgr_dynamic, update_format);
161 }
162 
163 bool
164 ValueObject::UpdateValueIfNeeded (DynamicValueType use_dynamic, bool update_format)
165 {
166 
167     bool did_change_formats = false;
168 
169     if (update_format)
170         did_change_formats = UpdateFormatsIfNeeded(use_dynamic);
171 
172     // If this is a constant value, then our success is predicated on whether
173     // we have an error or not
174     if (GetIsConstant())
175     {
176         // if you were asked to update your formatters, but did not get a chance to do it
177         // clear your own values (this serves the purpose of faking a stop-id for frozen
178         // objects (which are regarded as constant, but could have changes behind their backs
179         // because of the frozen-pointer depth limit)
180 		// TODO: decouple summary from value and then remove this code and only force-clear the summary
181         if (update_format && !did_change_formats)
182             m_summary_str.clear();
183         return m_error.Success();
184     }
185 
186     bool first_update = m_update_point.IsFirstEvaluation();
187 
188     if (m_update_point.NeedsUpdating())
189     {
190         m_update_point.SetUpdated();
191 
192         // Save the old value using swap to avoid a string copy which
193         // also will clear our m_value_str
194         if (m_value_str.empty())
195         {
196             m_old_value_valid = false;
197         }
198         else
199         {
200             m_old_value_valid = true;
201             m_old_value_str.swap (m_value_str);
202             m_value_str.clear();
203         }
204 
205         ClearUserVisibleData();
206 
207         const bool value_was_valid = GetValueIsValid();
208         SetValueDidChange (false);
209 
210         m_error.Clear();
211 
212         // Call the pure virtual function to update the value
213         bool success = UpdateValue ();
214 
215         SetValueIsValid (success);
216 
217         if (first_update)
218             SetValueDidChange (false);
219         else if (!m_value_did_change && success == false)
220         {
221             // The value wasn't gotten successfully, so we mark this
222             // as changed if the value used to be valid and now isn't
223             SetValueDidChange (value_was_valid);
224         }
225     }
226     return m_error.Success();
227 }
228 
229 bool
230 ValueObject::UpdateFormatsIfNeeded(DynamicValueType use_dynamic)
231 {
232     LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_TYPES));
233     if (log)
234         log->Printf("checking for FormatManager revisions. VO named %s is at revision %d, while the format manager is at revision %d",
235            GetName().GetCString(),
236            m_last_format_mgr_revision,
237            DataVisualization::GetCurrentRevision());
238 
239     bool any_change = false;
240 
241     if (HasCustomSummaryFormat() && m_update_point.GetModID() != m_user_id_of_forced_summary)
242     {
243         ClearCustomSummaryFormat();
244 
245         any_change = true;
246     }
247 
248     if ( (m_last_format_mgr_revision != DataVisualization::GetCurrentRevision()) ||
249           m_last_format_mgr_dynamic != use_dynamic)
250     {
251         SetValueFormat(DataVisualization::ValueFormats::GetFormat (*this, eNoDynamicValues));
252         SetSummaryFormat(DataVisualization::GetSummaryFormat (*this, use_dynamic));
253         SetSyntheticChildren(DataVisualization::GetSyntheticChildren (*this, use_dynamic));
254 
255         m_last_format_mgr_revision = DataVisualization::GetCurrentRevision();
256         m_last_format_mgr_dynamic = use_dynamic;
257 
258         any_change = true;
259     }
260 
261     return any_change;
262 
263 }
264 
265 void
266 ValueObject::SetNeedsUpdate ()
267 {
268     m_update_point.SetNeedsUpdate();
269     // We have to clear the value string here so ConstResult children will notice if their values are
270     // changed by hand (i.e. with SetValueAsCString).
271     m_value_str.clear();
272 }
273 
274 DataExtractor &
275 ValueObject::GetDataExtractor ()
276 {
277     UpdateValueIfNeeded(false);
278     return m_data;
279 }
280 
281 const Error &
282 ValueObject::GetError()
283 {
284     UpdateValueIfNeeded(false);
285     return m_error;
286 }
287 
288 const ConstString &
289 ValueObject::GetName() const
290 {
291     return m_name;
292 }
293 
294 const char *
295 ValueObject::GetLocationAsCString ()
296 {
297     if (UpdateValueIfNeeded(false))
298     {
299         if (m_location_str.empty())
300         {
301             StreamString sstr;
302 
303             switch (m_value.GetValueType())
304             {
305             default:
306                 break;
307 
308             case Value::eValueTypeScalar:
309                 if (m_value.GetContextType() == Value::eContextTypeRegisterInfo)
310                 {
311                     RegisterInfo *reg_info = m_value.GetRegisterInfo();
312                     if (reg_info)
313                     {
314                         if (reg_info->name)
315                             m_location_str = reg_info->name;
316                         else if (reg_info->alt_name)
317                             m_location_str = reg_info->alt_name;
318                         break;
319                     }
320                 }
321                 m_location_str = "scalar";
322                 break;
323 
324             case Value::eValueTypeLoadAddress:
325             case Value::eValueTypeFileAddress:
326             case Value::eValueTypeHostAddress:
327                 {
328                     uint32_t addr_nibble_size = m_data.GetAddressByteSize() * 2;
329                     sstr.Printf("0x%*.*llx", addr_nibble_size, addr_nibble_size, m_value.GetScalar().ULongLong(LLDB_INVALID_ADDRESS));
330                     m_location_str.swap(sstr.GetString());
331                 }
332                 break;
333             }
334         }
335     }
336     return m_location_str.c_str();
337 }
338 
339 Value &
340 ValueObject::GetValue()
341 {
342     return m_value;
343 }
344 
345 const Value &
346 ValueObject::GetValue() const
347 {
348     return m_value;
349 }
350 
351 bool
352 ValueObject::ResolveValue (Scalar &scalar)
353 {
354     if (UpdateValueIfNeeded(false)) // make sure that you are up to date before returning anything
355     {
356         ExecutionContext exe_ctx;
357         ExecutionContextScope *exe_scope = GetExecutionContextScope();
358         if (exe_scope)
359             exe_scope->CalculateExecutionContext(exe_ctx);
360         Value tmp_value(m_value);
361         scalar = tmp_value.ResolveValue(&exe_ctx, GetClangAST ());
362         if (scalar.IsValid())
363         {
364             const uint32_t bitfield_bit_size = GetBitfieldBitSize();
365             if (bitfield_bit_size)
366                 return scalar.ExtractBitfield (bitfield_bit_size, GetBitfieldBitOffset());
367             return true;
368         }
369     }
370     return false;
371 }
372 
373 bool
374 ValueObject::GetValueIsValid () const
375 {
376     return m_value_is_valid;
377 }
378 
379 
380 void
381 ValueObject::SetValueIsValid (bool b)
382 {
383     m_value_is_valid = b;
384 }
385 
386 bool
387 ValueObject::GetValueDidChange ()
388 {
389     GetValueAsCString ();
390     return m_value_did_change;
391 }
392 
393 void
394 ValueObject::SetValueDidChange (bool value_changed)
395 {
396     m_value_did_change = value_changed;
397 }
398 
399 ValueObjectSP
400 ValueObject::GetChildAtIndex (uint32_t idx, bool can_create)
401 {
402     ValueObjectSP child_sp;
403     // We may need to update our value if we are dynamic
404     if (IsPossibleDynamicType ())
405         UpdateValueIfNeeded(false);
406     if (idx < GetNumChildren())
407     {
408         // Check if we have already made the child value object?
409         if (can_create && m_children[idx] == NULL)
410         {
411             // No we haven't created the child at this index, so lets have our
412             // subclass do it and cache the result for quick future access.
413             m_children[idx] = CreateChildAtIndex (idx, false, 0);
414         }
415 
416         if (m_children[idx] != NULL)
417             return m_children[idx]->GetSP();
418     }
419     return child_sp;
420 }
421 
422 uint32_t
423 ValueObject::GetIndexOfChildWithName (const ConstString &name)
424 {
425     bool omit_empty_base_classes = true;
426     return ClangASTContext::GetIndexOfChildWithName (GetClangAST(),
427                                                      GetClangType(),
428                                                      name.GetCString(),
429                                                      omit_empty_base_classes);
430 }
431 
432 ValueObjectSP
433 ValueObject::GetChildMemberWithName (const ConstString &name, bool can_create)
434 {
435     // when getting a child by name, it could be buried inside some base
436     // classes (which really aren't part of the expression path), so we
437     // need a vector of indexes that can get us down to the correct child
438     ValueObjectSP child_sp;
439 
440     // We may need to update our value if we are dynamic
441     if (IsPossibleDynamicType ())
442         UpdateValueIfNeeded(false);
443 
444     std::vector<uint32_t> child_indexes;
445     clang::ASTContext *clang_ast = GetClangAST();
446     void *clang_type = GetClangType();
447     bool omit_empty_base_classes = true;
448     const size_t num_child_indexes =  ClangASTContext::GetIndexOfChildMemberWithName (clang_ast,
449                                                                                       clang_type,
450                                                                                       name.GetCString(),
451                                                                                       omit_empty_base_classes,
452                                                                                       child_indexes);
453     if (num_child_indexes > 0)
454     {
455         std::vector<uint32_t>::const_iterator pos = child_indexes.begin ();
456         std::vector<uint32_t>::const_iterator end = child_indexes.end ();
457 
458         child_sp = GetChildAtIndex(*pos, can_create);
459         for (++pos; pos != end; ++pos)
460         {
461             if (child_sp)
462             {
463                 ValueObjectSP new_child_sp(child_sp->GetChildAtIndex (*pos, can_create));
464                 child_sp = new_child_sp;
465             }
466             else
467             {
468                 child_sp.reset();
469             }
470 
471         }
472     }
473     return child_sp;
474 }
475 
476 
477 uint32_t
478 ValueObject::GetNumChildren ()
479 {
480     if (!m_children_count_valid)
481     {
482         SetNumChildren (CalculateNumChildren());
483     }
484     return m_children.size();
485 }
486 void
487 ValueObject::SetNumChildren (uint32_t num_children)
488 {
489     m_children_count_valid = true;
490     m_children.resize(num_children);
491 }
492 
493 void
494 ValueObject::SetName (const ConstString &name)
495 {
496     m_name = name;
497 }
498 
499 ValueObject *
500 ValueObject::CreateChildAtIndex (uint32_t idx, bool synthetic_array_member, int32_t synthetic_index)
501 {
502     ValueObject *valobj = NULL;
503 
504     bool omit_empty_base_classes = true;
505     bool ignore_array_bounds = synthetic_array_member;
506     std::string child_name_str;
507     uint32_t child_byte_size = 0;
508     int32_t child_byte_offset = 0;
509     uint32_t child_bitfield_bit_size = 0;
510     uint32_t child_bitfield_bit_offset = 0;
511     bool child_is_base_class = false;
512     bool child_is_deref_of_parent = false;
513 
514     const bool transparent_pointers = synthetic_array_member == false;
515     clang::ASTContext *clang_ast = GetClangAST();
516     clang_type_t clang_type = GetClangType();
517     clang_type_t child_clang_type;
518 
519     ExecutionContext exe_ctx;
520     GetExecutionContextScope()->CalculateExecutionContext (exe_ctx);
521 
522     child_clang_type = ClangASTContext::GetChildClangTypeAtIndex (&exe_ctx,
523                                                                   clang_ast,
524                                                                   GetName().GetCString(),
525                                                                   clang_type,
526                                                                   idx,
527                                                                   transparent_pointers,
528                                                                   omit_empty_base_classes,
529                                                                   ignore_array_bounds,
530                                                                   child_name_str,
531                                                                   child_byte_size,
532                                                                   child_byte_offset,
533                                                                   child_bitfield_bit_size,
534                                                                   child_bitfield_bit_offset,
535                                                                   child_is_base_class,
536                                                                   child_is_deref_of_parent);
537     if (child_clang_type && child_byte_size)
538     {
539         if (synthetic_index)
540             child_byte_offset += child_byte_size * synthetic_index;
541 
542         ConstString child_name;
543         if (!child_name_str.empty())
544             child_name.SetCString (child_name_str.c_str());
545 
546         valobj = new ValueObjectChild (*this,
547                                        clang_ast,
548                                        child_clang_type,
549                                        child_name,
550                                        child_byte_size,
551                                        child_byte_offset,
552                                        child_bitfield_bit_size,
553                                        child_bitfield_bit_offset,
554                                        child_is_base_class,
555                                        child_is_deref_of_parent,
556                                        eAddressTypeInvalid);
557         //if (valobj)
558         //    valobj->SetAddressTypeOfChildren(eAddressTypeInvalid);
559    }
560 
561     return valobj;
562 }
563 
564 const char *
565 ValueObject::GetSummaryAsCString ()
566 {
567     // Watch for recursion which can happen with summary strings and other
568     // variable formatting options.
569     if (m_is_getting_summary)
570         return NULL;
571 
572     m_is_getting_summary = true;
573 
574     if (UpdateValueIfNeeded (true))
575     {
576         if (m_summary_str.empty())
577         {
578             SummaryFormat *summary_format = GetSummaryFormat().get();
579 
580             if (summary_format)
581             {
582                 m_summary_str = summary_format->FormatObject(GetSP());
583             }
584             else
585             {
586                 clang_type_t clang_type = GetClangType();
587 
588                 // Do some default printout for function pointers
589                 if (clang_type)
590                 {
591                     StreamString sstr;
592                     clang_type_t elem_or_pointee_clang_type;
593                     const Flags type_flags (ClangASTContext::GetTypeInfo (clang_type,
594                                                                           GetClangAST(),
595                                                                           &elem_or_pointee_clang_type));
596 
597                     ExecutionContextScope *exe_scope = GetExecutionContextScope();
598                     if (exe_scope)
599                     {
600                         if (ClangASTContext::IsFunctionPointerType (clang_type))
601                         {
602                             AddressType func_ptr_address_type = eAddressTypeInvalid;
603                             addr_t func_ptr_address = GetPointerValue (&func_ptr_address_type);
604                             if (func_ptr_address != 0 && func_ptr_address != LLDB_INVALID_ADDRESS)
605                             {
606                                 switch (func_ptr_address_type)
607                                 {
608                                 case eAddressTypeInvalid:
609                                 case eAddressTypeFile:
610                                     break;
611 
612                                 case eAddressTypeLoad:
613                                     {
614                                         Address so_addr;
615                                         Target *target = exe_scope->CalculateTarget();
616                                         if (target && target->GetSectionLoadList().IsEmpty() == false)
617                                         {
618                                             if (target->GetSectionLoadList().ResolveLoadAddress(func_ptr_address, so_addr))
619                                             {
620                                                 so_addr.Dump (&sstr,
621                                                               exe_scope,
622                                                               Address::DumpStyleResolvedDescription,
623                                                               Address::DumpStyleSectionNameOffset);
624                                             }
625                                         }
626                                     }
627                                     break;
628 
629                                 case eAddressTypeHost:
630                                     break;
631                                 }
632                             }
633                             if (sstr.GetSize() > 0)
634                             {
635                                 m_summary_str.assign (1, '(');
636                                 m_summary_str.append (sstr.GetData(), sstr.GetSize());
637                                 m_summary_str.append (1, ')');
638                             }
639                         }
640                     }
641                 }
642             }
643         }
644     }
645     m_is_getting_summary = false;
646     if (m_summary_str.empty())
647         return NULL;
648     return m_summary_str.c_str();
649 }
650 
651 bool
652 ValueObject::IsCStringContainer(bool check_pointer)
653 {
654     clang_type_t elem_or_pointee_clang_type;
655     const Flags type_flags (ClangASTContext::GetTypeInfo (GetClangType(),
656                                                           GetClangAST(),
657                                                           &elem_or_pointee_clang_type));
658     bool is_char_arr_ptr (type_flags.AnySet (ClangASTContext::eTypeIsArray | ClangASTContext::eTypeIsPointer) &&
659             ClangASTContext::IsCharType (elem_or_pointee_clang_type));
660     if (!is_char_arr_ptr)
661         return false;
662     if (!check_pointer)
663         return true;
664     if (type_flags.Test(ClangASTContext::eTypeIsArray))
665         return true;
666     addr_t cstr_address = LLDB_INVALID_ADDRESS;
667     AddressType cstr_address_type = eAddressTypeInvalid;
668     cstr_address = GetAddressOf (true, &cstr_address_type);
669     return (cstr_address != LLDB_INVALID_ADDRESS);
670 }
671 
672 size_t
673 ValueObject::GetPointeeData (DataExtractor& data,
674                              uint32_t item_idx,
675                              uint32_t item_count)
676 {
677     if (!IsPointerType() && !IsArrayType())
678         return 0;
679 
680     if (item_count == 0)
681         return 0;
682 
683     uint32_t stride = 0;
684 
685     ClangASTType type(GetClangAST(),
686                       GetClangType());
687 
688     const uint64_t item_type_size = (IsPointerType() ? ClangASTType::GetTypeByteSize(GetClangAST(), type.GetPointeeType()) :
689                                      ClangASTType::GetTypeByteSize(GetClangAST(), type.GetArrayElementType(stride)));
690 
691     const uint64_t bytes = item_count * item_type_size;
692 
693     const uint64_t offset = item_idx * item_type_size;
694 
695     if (item_idx == 0 && item_count == 1) // simply a deref
696     {
697         if (IsPointerType())
698         {
699             Error error;
700             ValueObjectSP pointee_sp = Dereference(error);
701             if (error.Fail() || pointee_sp.get() == NULL)
702                 return 0;
703             return pointee_sp->GetDataExtractor().Copy(data);
704         }
705         else
706         {
707             ValueObjectSP child_sp = GetChildAtIndex(0, true);
708             if (child_sp.get() == NULL)
709                 return 0;
710             return child_sp->GetDataExtractor().Copy(data);
711         }
712         return true;
713     }
714     else /* (items > 1) */
715     {
716         Error error;
717         lldb_private::DataBufferHeap* heap_buf_ptr = NULL;
718         lldb::DataBufferSP data_sp(heap_buf_ptr = new lldb_private::DataBufferHeap());
719 
720         AddressType addr_type;
721         lldb::addr_t addr = IsPointerType() ? GetPointerValue(&addr_type) : GetAddressOf(true, &addr_type);
722 
723         ExecutionContextScope *exe_scope = GetExecutionContextScope();
724 
725 
726         switch (addr_type)
727         {
728             case eAddressTypeFile:
729                 {
730                     Module* module = GetModule();
731                     if (module)
732                     {
733                         Address so_addr;
734                         module->ResolveFileAddress(addr, so_addr);
735                         if (exe_scope)
736                         {
737                             Target* target = exe_scope->CalculateTarget();
738                             if (target)
739                             {
740                                 heap_buf_ptr->SetByteSize(bytes);
741                                 size_t bytes_read = target->ReadMemory(so_addr, false, heap_buf_ptr->GetBytes(), bytes, error);
742                                 if (error.Success())
743                                 {
744                                     data.SetData(data_sp);
745                                     return bytes_read;
746                                 }
747                             }
748                         }
749                     }
750                 }
751                 break;
752             case eAddressTypeLoad:
753                 if (exe_scope)
754                 {
755                     Process *process = exe_scope->CalculateProcess();
756                     if (process)
757                     {
758                         heap_buf_ptr->SetByteSize(bytes);
759                         size_t bytes_read = process->ReadMemory(addr + offset, heap_buf_ptr->GetBytes(), bytes, error);
760                         if (error.Success())
761                         {
762                             data.SetData(data_sp);
763                             return bytes_read;
764                         }
765                     }
766                 }
767                 break;
768             case eAddressTypeHost:
769                 {
770                     heap_buf_ptr->CopyData((uint8_t*)(addr + offset), bytes);
771                     data.SetData(data_sp);
772                     return bytes;
773                 }
774                 break;
775             case eAddressTypeInvalid:
776             default:
777                 break;
778         }
779     }
780     return 0;
781 }
782 
783 size_t
784 ValueObject::GetData (DataExtractor& data)
785 {
786     UpdateValueIfNeeded(false);
787     ExecutionContext exe_ctx;
788     GetExecutionContextScope()->CalculateExecutionContext(exe_ctx);
789     Error error = m_value.GetValueAsData(&exe_ctx, GetClangAST(), data, 0, GetModule());
790     if (error.Fail())
791         return 0;
792     data.SetAddressByteSize(m_data.GetAddressByteSize());
793     data.SetByteOrder(m_data.GetByteOrder());
794     return data.GetByteSize();
795 }
796 
797 // will compute strlen(str), but without consuming more than
798 // maxlen bytes out of str (this serves the purpose of reading
799 // chunks of a string without having to worry about
800 // missing NULL terminators in the chunk)
801 // of course, if strlen(str) > maxlen, the function will return
802 // maxlen_value (which should be != maxlen, because that allows you
803 // to know whether strlen(str) == maxlen or strlen(str) > maxlen)
804 static uint32_t
805 strlen_or_inf (const char* str,
806                uint32_t maxlen,
807                uint32_t maxlen_value)
808 {
809     uint32_t len = 0;
810     if (str)
811     {
812         while(*str)
813         {
814             len++;str++;
815             if (len > maxlen)
816                 return maxlen_value;
817         }
818     }
819     return len;
820 }
821 
822 void
823 ValueObject::ReadPointedString(Stream& s,
824                                Error& error,
825                                uint32_t max_length,
826                                bool honor_array,
827                                Format item_format)
828 {
829 
830     if (max_length == 0)
831         max_length = GetUpdatePoint().GetTargetSP()->GetMaximumSizeOfStringSummary();
832 
833     clang_type_t clang_type = GetClangType();
834     clang_type_t elem_or_pointee_clang_type;
835     const Flags type_flags (ClangASTContext::GetTypeInfo (clang_type,
836                                                           GetClangAST(),
837                                                           &elem_or_pointee_clang_type));
838     if (type_flags.AnySet (ClangASTContext::eTypeIsArray | ClangASTContext::eTypeIsPointer) &&
839         ClangASTContext::IsCharType (elem_or_pointee_clang_type))
840     {
841         ExecutionContextScope *exe_scope = GetExecutionContextScope();
842             if (exe_scope)
843             {
844                 Target *target = exe_scope->CalculateTarget();
845                 if (target == NULL)
846                 {
847                     s << "<no target to read from>";
848                 }
849                 else
850                 {
851                     addr_t cstr_address = LLDB_INVALID_ADDRESS;
852                     AddressType cstr_address_type = eAddressTypeInvalid;
853 
854                     size_t cstr_len = 0;
855                     bool capped_data = false;
856                     if (type_flags.Test (ClangASTContext::eTypeIsArray))
857                     {
858                         // We have an array
859                         cstr_len = ClangASTContext::GetArraySize (clang_type);
860                         if (cstr_len > max_length)
861                         {
862                             capped_data = true;
863                             cstr_len = max_length;
864                         }
865                         cstr_address = GetAddressOf (true, &cstr_address_type);
866                     }
867                     else
868                     {
869                         // We have a pointer
870                         cstr_address = GetPointerValue (&cstr_address_type);
871                     }
872                     if (cstr_address != 0 && cstr_address != LLDB_INVALID_ADDRESS)
873                     {
874                         Address cstr_so_addr (NULL, cstr_address);
875                         DataExtractor data;
876                         size_t bytes_read = 0;
877                         if (cstr_len > 0 && honor_array)
878                         {
879                             // I am using GetPointeeData() here to abstract the fact that some ValueObjects are actually frozen pointers in the host
880 						    // but the pointed-to data lives in the debuggee, and GetPointeeData() automatically takes care of this
881                             GetPointeeData(data, 0, cstr_len);
882 
883                             if ((bytes_read = data.GetByteSize()) > 0)
884                             {
885                                 s << '"';
886                                 data.Dump (&s,
887                                            0,                 // Start offset in "data"
888                                            item_format,
889                                            1,                 // Size of item (1 byte for a char!)
890                                            bytes_read,        // How many bytes to print?
891                                            UINT32_MAX,        // num per line
892                                            LLDB_INVALID_ADDRESS,// base address
893                                            0,                 // bitfield bit size
894                                            0);                // bitfield bit offset
895                                 if (capped_data)
896                                     s << "...";
897                                 s << '"';
898                             }
899                         }
900                         else
901                         {
902                             cstr_len = max_length;
903                             const size_t k_max_buf_size = 64;
904 
905                             size_t offset = 0;
906 
907                             int cstr_len_displayed = -1;
908                             bool capped_cstr = false;
909 							// I am using GetPointeeData() here to abstract the fact that some ValueObjects are actually frozen pointers in the host
910 						    // but the pointed-to data lives in the debuggee, and GetPointeeData() automatically takes care of this
911                             while ((bytes_read = GetPointeeData(data, offset, k_max_buf_size)) > 0)
912                             {
913                                 const char *cstr = data.PeekCStr(0);
914                                 size_t len = strlen_or_inf (cstr, k_max_buf_size, k_max_buf_size+1);
915                                 if (len > k_max_buf_size)
916                                     len = k_max_buf_size;
917                                 if (cstr && cstr_len_displayed < 0)
918                                     s << '"';
919 
920                                 if (cstr_len_displayed < 0)
921                                     cstr_len_displayed = len;
922 
923                                 if (len == 0)
924                                     break;
925                                 cstr_len_displayed += len;
926                                 if (len > bytes_read)
927                                     len = bytes_read;
928                                 if (len > cstr_len)
929                                     len = cstr_len;
930 
931                                 data.Dump (&s,
932                                            0,                 // Start offset in "data"
933                                            item_format,
934                                            1,                 // Size of item (1 byte for a char!)
935                                            len,               // How many bytes to print?
936                                            UINT32_MAX,        // num per line
937                                            LLDB_INVALID_ADDRESS,// base address
938                                            0,                 // bitfield bit size
939                                            0);                // bitfield bit offset
940 
941                                 if (len < k_max_buf_size)
942                                     break;
943 
944                                 if (len >= cstr_len)
945                                 {
946                                     capped_cstr = true;
947                                     break;
948                                 }
949 
950                                 cstr_len -= len;
951                                 offset += len;
952                             }
953 
954                             if (cstr_len_displayed >= 0)
955                             {
956                                 s << '"';
957                                 if (capped_cstr)
958                                     s << "...";
959                             }
960                         }
961                     }
962                 }
963             }
964     }
965     else
966     {
967         error.SetErrorString("impossible to read a string from this object");
968         s << "<not a string object>";
969     }
970 }
971 
972 const char *
973 ValueObject::GetObjectDescription ()
974 {
975 
976     if (!UpdateValueIfNeeded (true))
977         return NULL;
978 
979     if (!m_object_desc_str.empty())
980         return m_object_desc_str.c_str();
981 
982     ExecutionContextScope *exe_scope = GetExecutionContextScope();
983     if (exe_scope == NULL)
984         return NULL;
985 
986     Process *process = exe_scope->CalculateProcess();
987     if (process == NULL)
988         return NULL;
989 
990     StreamString s;
991 
992     LanguageType language = GetObjectRuntimeLanguage();
993     LanguageRuntime *runtime = process->GetLanguageRuntime(language);
994 
995     if (runtime == NULL)
996     {
997         // Aw, hell, if the things a pointer, or even just an integer, let's try ObjC anyway...
998         clang_type_t opaque_qual_type = GetClangType();
999         if (opaque_qual_type != NULL)
1000         {
1001             bool is_signed;
1002             if (ClangASTContext::IsIntegerType (opaque_qual_type, is_signed)
1003                 || ClangASTContext::IsPointerType (opaque_qual_type))
1004             {
1005                 runtime = process->GetLanguageRuntime(eLanguageTypeObjC);
1006             }
1007         }
1008     }
1009 
1010     if (runtime && runtime->GetObjectDescription(s, *this))
1011     {
1012         m_object_desc_str.append (s.GetData());
1013     }
1014 
1015     if (m_object_desc_str.empty())
1016         return NULL;
1017     else
1018         return m_object_desc_str.c_str();
1019 }
1020 
1021 const char *
1022 ValueObject::GetValueAsCString ()
1023 {
1024     // If our byte size is zero this is an aggregate type that has children
1025     if (ClangASTContext::IsAggregateType (GetClangType()) == false)
1026     {
1027         if (UpdateValueIfNeeded(true))
1028         {
1029             if (m_value_str.empty())
1030             {
1031                 const Value::ContextType context_type = m_value.GetContextType();
1032 
1033                 switch (context_type)
1034                 {
1035                 case Value::eContextTypeClangType:
1036                 case Value::eContextTypeLLDBType:
1037                 case Value::eContextTypeVariable:
1038                     {
1039                         lldb::Format my_format = GetFormat();
1040                         clang_type_t clang_type = GetClangType ();
1041                         if (clang_type)
1042                         {
1043                             if (m_format == lldb::eFormatDefault)
1044                             {
1045                                 if (m_last_value_format)
1046                                     my_format = m_last_value_format->GetFormat();
1047                                 else
1048                                 {
1049                                     if (m_is_bitfield_for_scalar)
1050                                         my_format = eFormatUnsigned;
1051                                     else
1052                                         my_format = ClangASTType::GetFormat(clang_type);
1053                                 }
1054                             }
1055                             StreamString sstr;
1056                             if (ClangASTType::DumpTypeValue (GetClangAST(),            // The clang AST
1057                                                              clang_type,               // The clang type to display
1058                                                              &sstr,
1059                                                              my_format,                   // Format to display this type with
1060                                                              m_data,                   // Data to extract from
1061                                                              0,                        // Byte offset into "m_data"
1062                                                              GetByteSize(),            // Byte size of item in "m_data"
1063                                                              GetBitfieldBitSize(),     // Bitfield bit size
1064                                                              GetBitfieldBitOffset(),
1065                                                              GetExecutionContextScope()))  // Bitfield bit offset
1066                                 m_value_str.swap(sstr.GetString());
1067                             else
1068                             {
1069                                 m_error.SetErrorStringWithFormat ("unsufficient data for value (only %lu of %lu bytes available)",
1070                                                                   m_data.GetByteSize(),
1071                                                                   GetByteSize());
1072                                 m_value_str.clear();
1073                             }
1074                         }
1075                     }
1076                     break;
1077 
1078                 case Value::eContextTypeRegisterInfo:
1079                     {
1080                         const RegisterInfo *reg_info = m_value.GetRegisterInfo();
1081                         if (reg_info)
1082                         {
1083                             StreamString reg_sstr;
1084                             m_data.Dump(&reg_sstr, 0, reg_info->format, reg_info->byte_size, 1, UINT32_MAX, LLDB_INVALID_ADDRESS, 0, 0, GetExecutionContextScope());
1085                             m_value_str.swap(reg_sstr.GetString());
1086                         }
1087                     }
1088                     break;
1089 
1090                 default:
1091                     break;
1092                 }
1093             }
1094 
1095             if (!m_value_did_change && m_old_value_valid)
1096             {
1097                 // The value was gotten successfully, so we consider the
1098                 // value as changed if the value string differs
1099                 SetValueDidChange (m_old_value_str != m_value_str);
1100             }
1101         }
1102     }
1103     if (m_value_str.empty())
1104         return NULL;
1105     return m_value_str.c_str();
1106 }
1107 
1108 // if > 8bytes, 0 is returned. this method should mostly be used
1109 // to read address values out of pointers
1110 uint64_t
1111 ValueObject::GetValueAsUnsigned (uint64_t fail_value)
1112 {
1113     // If our byte size is zero this is an aggregate type that has children
1114     if (ClangASTContext::IsAggregateType (GetClangType()) == false)
1115     {
1116         Scalar scalar;
1117         if (ResolveValue (scalar))
1118             return scalar.GetRawBits64(fail_value);
1119     }
1120     return fail_value;
1121 }
1122 
1123 bool
1124 ValueObject::GetPrintableRepresentation(Stream& s,
1125                                         ValueObjectRepresentationStyle val_obj_display,
1126                                         Format custom_format)
1127 {
1128 
1129     if (custom_format != eFormatInvalid)
1130         SetFormat(custom_format);
1131 
1132     const char * return_value;
1133     std::string alloc_mem;
1134 
1135     switch(val_obj_display)
1136     {
1137         case eDisplayValue:
1138             return_value = GetValueAsCString();
1139             break;
1140 
1141         case eDisplaySummary:
1142             return_value = GetSummaryAsCString();
1143             break;
1144 
1145         case eDisplayLanguageSpecific:
1146             return_value = GetObjectDescription();
1147             break;
1148 
1149         case eDisplayLocation:
1150             return_value = GetLocationAsCString();
1151             break;
1152 
1153         case eDisplayChildrenCount:
1154             {
1155                 alloc_mem.resize(512);
1156                 return_value = &alloc_mem[0];
1157                 int count = GetNumChildren();
1158                 snprintf((char*)return_value, 512, "%d", count);
1159             }
1160             break;
1161 
1162         case eDisplayType:
1163             return_value = GetTypeName().AsCString();
1164             break;
1165 
1166         default:
1167             break;
1168     }
1169 
1170     if (!return_value)
1171     {
1172         if (val_obj_display == eDisplayValue)
1173             return_value = GetSummaryAsCString();
1174         else if (val_obj_display == eDisplaySummary)
1175         {
1176             if (ClangASTContext::IsAggregateType (GetClangType()) == true)
1177             {
1178                 // this thing has no value, and it seems to have no summary
1179                 // some combination of unitialized data and other factors can also
1180                 // raise this condition, so let's print a nice generic description
1181                 {
1182                     alloc_mem.resize(684);
1183                     return_value = &alloc_mem[0];
1184                     snprintf((char*)return_value, 684, "%s @ %s", GetTypeName().AsCString(), GetLocationAsCString());
1185                 }
1186             }
1187             else
1188                 return_value = GetValueAsCString();
1189         }
1190     }
1191 
1192     if (return_value)
1193         s.PutCString(return_value);
1194     else
1195     {
1196         if (m_error.Fail())
1197             s.Printf("<%s>", m_error.AsCString());
1198         else if (val_obj_display == eDisplaySummary)
1199             s.PutCString("<no summary available>");
1200         else if (val_obj_display == eDisplayValue)
1201             s.PutCString("<no value available>");
1202         else if (val_obj_display == eDisplayLanguageSpecific)
1203             s.PutCString("<not a valid Objective-C object>"); // edit this if we have other runtimes that support a description
1204         else
1205             s.PutCString("<no printable representation>");
1206     }
1207 
1208     // we should only return false here if we could not do *anything*
1209     // even if we have an error message as output, that's a success
1210     // from our callers' perspective, so return true
1211     return true;
1212 
1213 }
1214 
1215 // if any more "special cases" are added to ValueObject::DumpPrintableRepresentation() please keep
1216 // this call up to date by returning true for your new special cases. We will eventually move
1217 // to checking this call result before trying to display special cases
1218 bool
1219 ValueObject::HasSpecialCasesForPrintableRepresentation(ValueObjectRepresentationStyle val_obj_display,
1220                                                        Format custom_format)
1221 {
1222     clang_type_t elem_or_pointee_type;
1223     Flags flags(ClangASTContext::GetTypeInfo(GetClangType(), GetClangAST(), &elem_or_pointee_type));
1224 
1225     if (flags.AnySet(ClangASTContext::eTypeIsArray | ClangASTContext::eTypeIsPointer)
1226         && val_obj_display == ValueObject::eDisplayValue)
1227     {
1228         if (IsCStringContainer(true) &&
1229             (custom_format == eFormatCString ||
1230              custom_format == eFormatCharArray ||
1231              custom_format == eFormatChar ||
1232              custom_format == eFormatVectorOfChar))
1233             return true;
1234 
1235         if (flags.Test(ClangASTContext::eTypeIsArray))
1236         {
1237             if ((custom_format == eFormatBytes) ||
1238                 (custom_format == eFormatBytesWithASCII))
1239                 return true;
1240 
1241             if ((custom_format == eFormatVectorOfChar) ||
1242                 (custom_format == eFormatVectorOfFloat32) ||
1243                 (custom_format == eFormatVectorOfFloat64) ||
1244                 (custom_format == eFormatVectorOfSInt16) ||
1245                 (custom_format == eFormatVectorOfSInt32) ||
1246                 (custom_format == eFormatVectorOfSInt64) ||
1247                 (custom_format == eFormatVectorOfSInt8) ||
1248                 (custom_format == eFormatVectorOfUInt128) ||
1249                 (custom_format == eFormatVectorOfUInt16) ||
1250                 (custom_format == eFormatVectorOfUInt32) ||
1251                 (custom_format == eFormatVectorOfUInt64) ||
1252                 (custom_format == eFormatVectorOfUInt8))
1253                 return true;
1254         }
1255     }
1256     return false;
1257 }
1258 
1259 bool
1260 ValueObject::DumpPrintableRepresentation(Stream& s,
1261                                          ValueObjectRepresentationStyle val_obj_display,
1262                                          Format custom_format,
1263                                          bool only_special)
1264 {
1265 
1266     clang_type_t elem_or_pointee_type;
1267     Flags flags(ClangASTContext::GetTypeInfo(GetClangType(), GetClangAST(), &elem_or_pointee_type));
1268 
1269     if (flags.AnySet(ClangASTContext::eTypeIsArray | ClangASTContext::eTypeIsPointer)
1270          && val_obj_display == ValueObject::eDisplayValue)
1271     {
1272         // when being asked to get a printable display an array or pointer type directly,
1273         // try to "do the right thing"
1274 
1275         if (IsCStringContainer(true) &&
1276             (custom_format == eFormatCString ||
1277              custom_format == eFormatCharArray ||
1278              custom_format == eFormatChar ||
1279              custom_format == eFormatVectorOfChar)) // print char[] & char* directly
1280         {
1281             Error error;
1282             ReadPointedString(s,
1283                               error,
1284                               0,
1285                               (custom_format == eFormatVectorOfChar) ||
1286                               (custom_format == eFormatCharArray));
1287             return !error.Fail();
1288         }
1289 
1290         if (custom_format == eFormatEnum)
1291             return false;
1292 
1293         // this only works for arrays, because I have no way to know when
1294         // the pointed memory ends, and no special \0 end of data marker
1295         if (flags.Test(ClangASTContext::eTypeIsArray))
1296         {
1297             if ((custom_format == eFormatBytes) ||
1298                 (custom_format == eFormatBytesWithASCII))
1299             {
1300                 uint32_t count = GetNumChildren();
1301 
1302                 s << '[';
1303                 for (uint32_t low = 0; low < count; low++)
1304                 {
1305 
1306                     if (low)
1307                         s << ',';
1308 
1309                     ValueObjectSP child = GetChildAtIndex(low,true);
1310                     if (!child.get())
1311                     {
1312                         s << "<invalid child>";
1313                         continue;
1314                     }
1315                     child->DumpPrintableRepresentation(s, ValueObject::eDisplayValue, custom_format);
1316                 }
1317 
1318                 s << ']';
1319 
1320                 return true;
1321             }
1322 
1323             if ((custom_format == eFormatVectorOfChar) ||
1324                 (custom_format == eFormatVectorOfFloat32) ||
1325                 (custom_format == eFormatVectorOfFloat64) ||
1326                 (custom_format == eFormatVectorOfSInt16) ||
1327                 (custom_format == eFormatVectorOfSInt32) ||
1328                 (custom_format == eFormatVectorOfSInt64) ||
1329                 (custom_format == eFormatVectorOfSInt8) ||
1330                 (custom_format == eFormatVectorOfUInt128) ||
1331                 (custom_format == eFormatVectorOfUInt16) ||
1332                 (custom_format == eFormatVectorOfUInt32) ||
1333                 (custom_format == eFormatVectorOfUInt64) ||
1334                 (custom_format == eFormatVectorOfUInt8)) // arrays of bytes, bytes with ASCII or any vector format should be printed directly
1335             {
1336                 uint32_t count = GetNumChildren();
1337 
1338                 Format format = FormatManager::GetSingleItemFormat(custom_format);
1339 
1340                 s << '[';
1341                 for (uint32_t low = 0; low < count; low++)
1342                 {
1343 
1344                     if (low)
1345                         s << ',';
1346 
1347                     ValueObjectSP child = GetChildAtIndex(low,true);
1348                     if (!child.get())
1349                     {
1350                         s << "<invalid child>";
1351                         continue;
1352                     }
1353                     child->DumpPrintableRepresentation(s, ValueObject::eDisplayValue, format);
1354                 }
1355 
1356                 s << ']';
1357 
1358                 return true;
1359             }
1360         }
1361 
1362         if ((custom_format == eFormatBoolean) ||
1363             (custom_format == eFormatBinary) ||
1364             (custom_format == eFormatChar) ||
1365             (custom_format == eFormatCharPrintable) ||
1366             (custom_format == eFormatComplexFloat) ||
1367             (custom_format == eFormatDecimal) ||
1368             (custom_format == eFormatHex) ||
1369             (custom_format == eFormatFloat) ||
1370             (custom_format == eFormatOctal) ||
1371             (custom_format == eFormatOSType) ||
1372             (custom_format == eFormatUnicode16) ||
1373             (custom_format == eFormatUnicode32) ||
1374             (custom_format == eFormatUnsigned) ||
1375             (custom_format == eFormatPointer) ||
1376             (custom_format == eFormatComplexInteger) ||
1377             (custom_format == eFormatComplex) ||
1378             (custom_format == eFormatDefault)) // use the [] operator
1379             return false;
1380     }
1381 
1382     if (only_special)
1383         return false;
1384 
1385     bool var_success = GetPrintableRepresentation(s, val_obj_display, custom_format);
1386     if (custom_format != eFormatInvalid)
1387         SetFormat(eFormatDefault);
1388     return var_success;
1389 }
1390 
1391 addr_t
1392 ValueObject::GetAddressOf (bool scalar_is_load_address, AddressType *address_type)
1393 {
1394     if (!UpdateValueIfNeeded(false))
1395         return LLDB_INVALID_ADDRESS;
1396 
1397     switch (m_value.GetValueType())
1398     {
1399     case Value::eValueTypeScalar:
1400         if (scalar_is_load_address)
1401         {
1402             if(address_type)
1403                 *address_type = eAddressTypeLoad;
1404             return m_value.GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
1405         }
1406         break;
1407 
1408     case Value::eValueTypeLoadAddress:
1409     case Value::eValueTypeFileAddress:
1410     case Value::eValueTypeHostAddress:
1411         {
1412             if(address_type)
1413                 *address_type = m_value.GetValueAddressType ();
1414             return m_value.GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
1415         }
1416         break;
1417     }
1418     if (address_type)
1419         *address_type = eAddressTypeInvalid;
1420     return LLDB_INVALID_ADDRESS;
1421 }
1422 
1423 addr_t
1424 ValueObject::GetPointerValue (AddressType *address_type)
1425 {
1426     addr_t address = LLDB_INVALID_ADDRESS;
1427     if(address_type)
1428         *address_type = eAddressTypeInvalid;
1429 
1430     if (!UpdateValueIfNeeded(false))
1431         return address;
1432 
1433     switch (m_value.GetValueType())
1434     {
1435     case Value::eValueTypeScalar:
1436         address = m_value.GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
1437         break;
1438 
1439     case Value::eValueTypeHostAddress:
1440     case Value::eValueTypeLoadAddress:
1441     case Value::eValueTypeFileAddress:
1442         {
1443             uint32_t data_offset = 0;
1444             address = m_data.GetPointer(&data_offset);
1445         }
1446         break;
1447     }
1448 
1449     if (address_type)
1450         *address_type = GetAddressTypeOfChildren();
1451 
1452     return address;
1453 }
1454 
1455 bool
1456 ValueObject::SetValueFromCString (const char *value_str)
1457 {
1458     // Make sure our value is up to date first so that our location and location
1459     // type is valid.
1460     if (!UpdateValueIfNeeded(false))
1461         return false;
1462 
1463     uint32_t count = 0;
1464     Encoding encoding = ClangASTType::GetEncoding (GetClangType(), count);
1465 
1466     const size_t byte_size = GetByteSize();
1467 
1468     Value::ValueType value_type = m_value.GetValueType();
1469 
1470     if (value_type == Value::eValueTypeScalar)
1471     {
1472         // If the value is already a scalar, then let the scalar change itself:
1473         m_value.GetScalar().SetValueFromCString (value_str, encoding, byte_size);
1474     }
1475     else if (byte_size <= Scalar::GetMaxByteSize())
1476     {
1477         // If the value fits in a scalar, then make a new scalar and again let the
1478         // scalar code do the conversion, then figure out where to put the new value.
1479         Scalar new_scalar;
1480         Error error;
1481         error = new_scalar.SetValueFromCString (value_str, encoding, byte_size);
1482         if (error.Success())
1483         {
1484             switch (value_type)
1485             {
1486                 case Value::eValueTypeLoadAddress:
1487                 {
1488                     // If it is a load address, then the scalar value is the storage location
1489                     // of the data, and we have to shove this value down to that load location.
1490                     ProcessSP process_sp = GetUpdatePoint().GetProcessSP();
1491                     if (process_sp)
1492                     {
1493                         addr_t target_addr = m_value.GetScalar().GetRawBits64(LLDB_INVALID_ADDRESS);
1494                         size_t bytes_written = process_sp->WriteScalarToMemory (target_addr,
1495                                                                             new_scalar,
1496                                                                             byte_size,
1497                                                                             error);
1498                         if (!error.Success() || bytes_written != byte_size)
1499                             return false;
1500                     }
1501                 }
1502                 break;
1503                 case Value::eValueTypeHostAddress:
1504                 {
1505                     // If it is a host address, then we stuff the scalar as a DataBuffer into the Value's data.
1506                     DataExtractor new_data;
1507                     new_data.SetByteOrder (m_data.GetByteOrder());
1508 
1509                     DataBufferSP buffer_sp (new DataBufferHeap(byte_size, 0));
1510                     m_data.SetData(buffer_sp, 0);
1511                     bool success = new_scalar.GetData(new_data);
1512                     if (success)
1513                     {
1514                         new_data.CopyByteOrderedData(0,
1515                                                      byte_size,
1516                                                      const_cast<uint8_t *>(m_data.GetDataStart()),
1517                                                      byte_size,
1518                                                      m_data.GetByteOrder());
1519                     }
1520                     m_value.GetScalar() = (uintptr_t)m_data.GetDataStart();
1521 
1522                 }
1523                 break;
1524                 case Value::eValueTypeFileAddress:
1525                 case Value::eValueTypeScalar:
1526                 break;
1527             }
1528         }
1529         else
1530         {
1531             return false;
1532         }
1533     }
1534     else
1535     {
1536         // We don't support setting things bigger than a scalar at present.
1537         return false;
1538     }
1539 
1540     // If we have reached this point, then we have successfully changed the value.
1541     SetNeedsUpdate();
1542     return true;
1543 }
1544 
1545 LanguageType
1546 ValueObject::GetObjectRuntimeLanguage ()
1547 {
1548     return ClangASTType::GetMinimumLanguage (GetClangAST(),
1549                                              GetClangType());
1550 }
1551 
1552 void
1553 ValueObject::AddSyntheticChild (const ConstString &key, ValueObject *valobj)
1554 {
1555     m_synthetic_children[key] = valobj;
1556 }
1557 
1558 ValueObjectSP
1559 ValueObject::GetSyntheticChild (const ConstString &key) const
1560 {
1561     ValueObjectSP synthetic_child_sp;
1562     std::map<ConstString, ValueObject *>::const_iterator pos = m_synthetic_children.find (key);
1563     if (pos != m_synthetic_children.end())
1564         synthetic_child_sp = pos->second->GetSP();
1565     return synthetic_child_sp;
1566 }
1567 
1568 bool
1569 ValueObject::IsPointerType ()
1570 {
1571     return ClangASTContext::IsPointerType (GetClangType());
1572 }
1573 
1574 bool
1575 ValueObject::IsArrayType ()
1576 {
1577     return ClangASTContext::IsArrayType (GetClangType());
1578 }
1579 
1580 bool
1581 ValueObject::IsScalarType ()
1582 {
1583     return ClangASTContext::IsScalarType (GetClangType());
1584 }
1585 
1586 bool
1587 ValueObject::IsIntegerType (bool &is_signed)
1588 {
1589     return ClangASTContext::IsIntegerType (GetClangType(), is_signed);
1590 }
1591 
1592 bool
1593 ValueObject::IsPointerOrReferenceType ()
1594 {
1595     return ClangASTContext::IsPointerOrReferenceType (GetClangType());
1596 }
1597 
1598 bool
1599 ValueObject::IsPossibleCPlusPlusDynamicType ()
1600 {
1601     return ClangASTContext::IsPossibleCPlusPlusDynamicType (GetClangAST (), GetClangType());
1602 }
1603 
1604 bool
1605 ValueObject::IsPossibleDynamicType ()
1606 {
1607     return ClangASTContext::IsPossibleDynamicType (GetClangAST (), GetClangType());
1608 }
1609 
1610 ValueObjectSP
1611 ValueObject::GetSyntheticArrayMember (int32_t index, bool can_create)
1612 {
1613     if (IsArrayType())
1614         return GetSyntheticArrayMemberFromArray(index, can_create);
1615 
1616     if (IsPointerType())
1617         return GetSyntheticArrayMemberFromPointer(index, can_create);
1618 
1619     return ValueObjectSP();
1620 
1621 }
1622 
1623 ValueObjectSP
1624 ValueObject::GetSyntheticArrayMemberFromPointer (int32_t index, bool can_create)
1625 {
1626     ValueObjectSP synthetic_child_sp;
1627     if (IsPointerType ())
1628     {
1629         char index_str[64];
1630         snprintf(index_str, sizeof(index_str), "[%i]", index);
1631         ConstString index_const_str(index_str);
1632         // Check if we have already created a synthetic array member in this
1633         // valid object. If we have we will re-use it.
1634         synthetic_child_sp = GetSyntheticChild (index_const_str);
1635         if (!synthetic_child_sp)
1636         {
1637             ValueObject *synthetic_child;
1638             // We haven't made a synthetic array member for INDEX yet, so
1639             // lets make one and cache it for any future reference.
1640             synthetic_child = CreateChildAtIndex(0, true, index);
1641 
1642             // Cache the value if we got one back...
1643             if (synthetic_child)
1644             {
1645                 AddSyntheticChild(index_const_str, synthetic_child);
1646                 synthetic_child_sp = synthetic_child->GetSP();
1647                 synthetic_child_sp->SetName(ConstString(index_str));
1648                 synthetic_child_sp->m_is_array_item_for_pointer = true;
1649             }
1650         }
1651     }
1652     return synthetic_child_sp;
1653 }
1654 
1655 // This allows you to create an array member using and index
1656 // that doesn't not fall in the normal bounds of the array.
1657 // Many times structure can be defined as:
1658 // struct Collection
1659 // {
1660 //     uint32_t item_count;
1661 //     Item item_array[0];
1662 // };
1663 // The size of the "item_array" is 1, but many times in practice
1664 // there are more items in "item_array".
1665 
1666 ValueObjectSP
1667 ValueObject::GetSyntheticArrayMemberFromArray (int32_t index, bool can_create)
1668 {
1669     ValueObjectSP synthetic_child_sp;
1670     if (IsArrayType ())
1671     {
1672         char index_str[64];
1673         snprintf(index_str, sizeof(index_str), "[%i]", index);
1674         ConstString index_const_str(index_str);
1675         // Check if we have already created a synthetic array member in this
1676         // valid object. If we have we will re-use it.
1677         synthetic_child_sp = GetSyntheticChild (index_const_str);
1678         if (!synthetic_child_sp)
1679         {
1680             ValueObject *synthetic_child;
1681             // We haven't made a synthetic array member for INDEX yet, so
1682             // lets make one and cache it for any future reference.
1683             synthetic_child = CreateChildAtIndex(0, true, index);
1684 
1685             // Cache the value if we got one back...
1686             if (synthetic_child)
1687             {
1688                 AddSyntheticChild(index_const_str, synthetic_child);
1689                 synthetic_child_sp = synthetic_child->GetSP();
1690                 synthetic_child_sp->SetName(ConstString(index_str));
1691                 synthetic_child_sp->m_is_array_item_for_pointer = true;
1692             }
1693         }
1694     }
1695     return synthetic_child_sp;
1696 }
1697 
1698 ValueObjectSP
1699 ValueObject::GetSyntheticBitFieldChild (uint32_t from, uint32_t to, bool can_create)
1700 {
1701     ValueObjectSP synthetic_child_sp;
1702     if (IsScalarType ())
1703     {
1704         char index_str[64];
1705         snprintf(index_str, sizeof(index_str), "[%i-%i]", from, to);
1706         ConstString index_const_str(index_str);
1707         // Check if we have already created a synthetic array member in this
1708         // valid object. If we have we will re-use it.
1709         synthetic_child_sp = GetSyntheticChild (index_const_str);
1710         if (!synthetic_child_sp)
1711         {
1712             ValueObjectChild *synthetic_child;
1713             // We haven't made a synthetic array member for INDEX yet, so
1714             // lets make one and cache it for any future reference.
1715             synthetic_child = new ValueObjectChild(*this,
1716                                                       GetClangAST(),
1717                                                       GetClangType(),
1718                                                       index_const_str,
1719                                                       GetByteSize(),
1720                                                       0,
1721                                                       to-from+1,
1722                                                       from,
1723                                                       false,
1724                                                       false,
1725                                                       eAddressTypeInvalid);
1726 
1727             // Cache the value if we got one back...
1728             if (synthetic_child)
1729             {
1730                 AddSyntheticChild(index_const_str, synthetic_child);
1731                 synthetic_child_sp = synthetic_child->GetSP();
1732                 synthetic_child_sp->SetName(ConstString(index_str));
1733                 synthetic_child_sp->m_is_bitfield_for_scalar = true;
1734             }
1735         }
1736     }
1737     return synthetic_child_sp;
1738 }
1739 
1740 ValueObjectSP
1741 ValueObject::GetSyntheticArrayRangeChild (uint32_t from, uint32_t to, bool can_create)
1742 {
1743     ValueObjectSP synthetic_child_sp;
1744     if (IsArrayType () || IsPointerType ())
1745     {
1746         char index_str[64];
1747         snprintf(index_str, sizeof(index_str), "[%i-%i]", from, to);
1748         ConstString index_const_str(index_str);
1749         // Check if we have already created a synthetic array member in this
1750         // valid object. If we have we will re-use it.
1751         synthetic_child_sp = GetSyntheticChild (index_const_str);
1752         if (!synthetic_child_sp)
1753         {
1754             ValueObjectSynthetic *synthetic_child;
1755 
1756             // We haven't made a synthetic array member for INDEX yet, so
1757             // lets make one and cache it for any future reference.
1758             SyntheticArrayView *view = new SyntheticArrayView();
1759             view->AddRange(from,to);
1760             SyntheticChildrenSP view_sp(view);
1761             synthetic_child = new ValueObjectSynthetic(*this, view_sp);
1762 
1763             // Cache the value if we got one back...
1764             if (synthetic_child)
1765             {
1766                 AddSyntheticChild(index_const_str, synthetic_child);
1767                 synthetic_child_sp = synthetic_child->GetSP();
1768                 synthetic_child_sp->SetName(ConstString(index_str));
1769                 synthetic_child_sp->m_is_bitfield_for_scalar = true;
1770             }
1771         }
1772     }
1773     return synthetic_child_sp;
1774 }
1775 
1776 ValueObjectSP
1777 ValueObject::GetSyntheticChildAtOffset(uint32_t offset, const ClangASTType& type, bool can_create)
1778 {
1779 
1780     ValueObjectSP synthetic_child_sp;
1781 
1782     char name_str[64];
1783     snprintf(name_str, sizeof(name_str), "@%i", offset);
1784     ConstString name_const_str(name_str);
1785 
1786     // Check if we have already created a synthetic array member in this
1787     // valid object. If we have we will re-use it.
1788     synthetic_child_sp = GetSyntheticChild (name_const_str);
1789 
1790     if (synthetic_child_sp.get())
1791         return synthetic_child_sp;
1792 
1793     if (!can_create)
1794         return ValueObjectSP();
1795 
1796     ValueObjectChild *synthetic_child = new ValueObjectChild(*this,
1797                                                              type.GetASTContext(),
1798                                                              type.GetOpaqueQualType(),
1799                                                              name_const_str,
1800                                                              type.GetTypeByteSize(),
1801                                                              offset,
1802                                                              0,
1803                                                              0,
1804                                                              false,
1805                                                              false,
1806                                                              eAddressTypeInvalid);
1807     if (synthetic_child)
1808     {
1809         AddSyntheticChild(name_const_str, synthetic_child);
1810         synthetic_child_sp = synthetic_child->GetSP();
1811         synthetic_child_sp->SetName(name_const_str);
1812         synthetic_child_sp->m_is_child_at_offset = true;
1813     }
1814     return synthetic_child_sp;
1815 }
1816 
1817 // your expression path needs to have a leading . or ->
1818 // (unless it somehow "looks like" an array, in which case it has
1819 // a leading [ symbol). while the [ is meaningful and should be shown
1820 // to the user, . and -> are just parser design, but by no means
1821 // added information for the user.. strip them off
1822 static const char*
1823 SkipLeadingExpressionPathSeparators(const char* expression)
1824 {
1825     if (!expression || !expression[0])
1826         return expression;
1827     if (expression[0] == '.')
1828         return expression+1;
1829     if (expression[0] == '-' && expression[1] == '>')
1830         return expression+2;
1831     return expression;
1832 }
1833 
1834 ValueObjectSP
1835 ValueObject::GetSyntheticExpressionPathChild(const char* expression, bool can_create)
1836 {
1837     ValueObjectSP synthetic_child_sp;
1838     ConstString name_const_string(expression);
1839     // Check if we have already created a synthetic array member in this
1840     // valid object. If we have we will re-use it.
1841     synthetic_child_sp = GetSyntheticChild (name_const_string);
1842     if (!synthetic_child_sp)
1843     {
1844         // We haven't made a synthetic array member for expression yet, so
1845         // lets make one and cache it for any future reference.
1846         synthetic_child_sp = GetValueForExpressionPath(expression);
1847 
1848         // Cache the value if we got one back...
1849         if (synthetic_child_sp.get())
1850         {
1851             AddSyntheticChild(name_const_string, synthetic_child_sp.get());
1852             synthetic_child_sp->SetName(ConstString(SkipLeadingExpressionPathSeparators(expression)));
1853             synthetic_child_sp->m_is_expression_path_child = true;
1854         }
1855     }
1856     return synthetic_child_sp;
1857 }
1858 
1859 void
1860 ValueObject::CalculateSyntheticValue (SyntheticValueType use_synthetic)
1861 {
1862     if (use_synthetic == eNoSyntheticFilter)
1863         return;
1864 
1865     UpdateFormatsIfNeeded(m_last_format_mgr_dynamic);
1866 
1867     if (m_last_synthetic_filter.get() == NULL)
1868         return;
1869 
1870     if (m_synthetic_value == NULL)
1871         m_synthetic_value = new ValueObjectSynthetic(*this, m_last_synthetic_filter);
1872 
1873 }
1874 
1875 void
1876 ValueObject::CalculateDynamicValue (DynamicValueType use_dynamic)
1877 {
1878     if (use_dynamic == eNoDynamicValues)
1879         return;
1880 
1881     if (!m_dynamic_value && !IsDynamic())
1882     {
1883         Process *process = m_update_point.GetProcessSP().get();
1884         bool worth_having_dynamic_value = false;
1885 
1886 
1887         // FIXME: Process should have some kind of "map over Runtimes" so we don't have to
1888         // hard code this everywhere.
1889         LanguageType known_type = GetObjectRuntimeLanguage();
1890         if (known_type != eLanguageTypeUnknown && known_type != eLanguageTypeC)
1891         {
1892             LanguageRuntime *runtime = process->GetLanguageRuntime (known_type);
1893             if (runtime)
1894                 worth_having_dynamic_value = runtime->CouldHaveDynamicValue(*this);
1895         }
1896         else
1897         {
1898             LanguageRuntime *cpp_runtime = process->GetLanguageRuntime (eLanguageTypeC_plus_plus);
1899             if (cpp_runtime)
1900                 worth_having_dynamic_value = cpp_runtime->CouldHaveDynamicValue(*this);
1901 
1902             if (!worth_having_dynamic_value)
1903             {
1904                 LanguageRuntime *objc_runtime = process->GetLanguageRuntime (eLanguageTypeObjC);
1905                 if (objc_runtime)
1906                     worth_having_dynamic_value = objc_runtime->CouldHaveDynamicValue(*this);
1907             }
1908         }
1909 
1910         if (worth_having_dynamic_value)
1911             m_dynamic_value = new ValueObjectDynamicValue (*this, use_dynamic);
1912 
1913 //        if (worth_having_dynamic_value)
1914 //            printf ("Adding dynamic value %s (%p) to (%p) - manager %p.\n", m_name.GetCString(), m_dynamic_value, this, m_manager);
1915 
1916     }
1917 }
1918 
1919 ValueObjectSP
1920 ValueObject::GetDynamicValue (DynamicValueType use_dynamic)
1921 {
1922     if (use_dynamic == eNoDynamicValues)
1923         return ValueObjectSP();
1924 
1925     if (!IsDynamic() && m_dynamic_value == NULL)
1926     {
1927         CalculateDynamicValue(use_dynamic);
1928     }
1929     if (m_dynamic_value)
1930         return m_dynamic_value->GetSP();
1931     else
1932         return ValueObjectSP();
1933 }
1934 
1935 ValueObjectSP
1936 ValueObject::GetStaticValue()
1937 {
1938     return GetSP();
1939 }
1940 
1941 // GetDynamicValue() returns a NULL SharedPointer if the object is not dynamic
1942 // or we do not really want a dynamic VO. this method instead returns this object
1943 // itself when making it synthetic has no meaning. this makes it much simpler
1944 // to replace the SyntheticValue for the ValueObject
1945 ValueObjectSP
1946 ValueObject::GetSyntheticValue (SyntheticValueType use_synthetic)
1947 {
1948     if (use_synthetic == eNoSyntheticFilter)
1949         return GetSP();
1950 
1951     UpdateFormatsIfNeeded(m_last_format_mgr_dynamic);
1952 
1953     if (m_last_synthetic_filter.get() == NULL)
1954         return GetSP();
1955 
1956     CalculateSyntheticValue(use_synthetic);
1957 
1958     if (m_synthetic_value)
1959         return m_synthetic_value->GetSP();
1960     else
1961         return GetSP();
1962 }
1963 
1964 bool
1965 ValueObject::HasSyntheticValue()
1966 {
1967     UpdateFormatsIfNeeded(m_last_format_mgr_dynamic);
1968 
1969     if (m_last_synthetic_filter.get() == NULL)
1970         return false;
1971 
1972     CalculateSyntheticValue(eUseSyntheticFilter);
1973 
1974     if (m_synthetic_value)
1975         return true;
1976     else
1977         return false;
1978 }
1979 
1980 bool
1981 ValueObject::GetBaseClassPath (Stream &s)
1982 {
1983     if (IsBaseClass())
1984     {
1985         bool parent_had_base_class = GetParent() && GetParent()->GetBaseClassPath (s);
1986         clang_type_t clang_type = GetClangType();
1987         std::string cxx_class_name;
1988         bool this_had_base_class = ClangASTContext::GetCXXClassName (clang_type, cxx_class_name);
1989         if (this_had_base_class)
1990         {
1991             if (parent_had_base_class)
1992                 s.PutCString("::");
1993             s.PutCString(cxx_class_name.c_str());
1994         }
1995         return parent_had_base_class || this_had_base_class;
1996     }
1997     return false;
1998 }
1999 
2000 
2001 ValueObject *
2002 ValueObject::GetNonBaseClassParent()
2003 {
2004     if (GetParent())
2005     {
2006         if (GetParent()->IsBaseClass())
2007             return GetParent()->GetNonBaseClassParent();
2008         else
2009             return GetParent();
2010     }
2011     return NULL;
2012 }
2013 
2014 void
2015 ValueObject::GetExpressionPath (Stream &s, bool qualify_cxx_base_classes, GetExpressionPathFormat epformat)
2016 {
2017     const bool is_deref_of_parent = IsDereferenceOfParent ();
2018 
2019     if (is_deref_of_parent && epformat == eDereferencePointers)
2020     {
2021         // this is the original format of GetExpressionPath() producing code like *(a_ptr).memberName, which is entirely
2022         // fine, until you put this into StackFrame::GetValueForVariableExpressionPath() which prefers to see a_ptr->memberName.
2023         // the eHonorPointers mode is meant to produce strings in this latter format
2024         s.PutCString("*(");
2025     }
2026 
2027     ValueObject* parent = GetParent();
2028 
2029     if (parent)
2030         parent->GetExpressionPath (s, qualify_cxx_base_classes, epformat);
2031 
2032     // if we are a deref_of_parent just because we are synthetic array
2033     // members made up to allow ptr[%d] syntax to work in variable
2034     // printing, then add our name ([%d]) to the expression path
2035     if (m_is_array_item_for_pointer && epformat == eHonorPointers)
2036         s.PutCString(m_name.AsCString());
2037 
2038     if (!IsBaseClass())
2039     {
2040         if (!is_deref_of_parent)
2041         {
2042             ValueObject *non_base_class_parent = GetNonBaseClassParent();
2043             if (non_base_class_parent)
2044             {
2045                 clang_type_t non_base_class_parent_clang_type = non_base_class_parent->GetClangType();
2046                 if (non_base_class_parent_clang_type)
2047                 {
2048                     const uint32_t non_base_class_parent_type_info = ClangASTContext::GetTypeInfo (non_base_class_parent_clang_type, NULL, NULL);
2049 
2050                     if (parent && parent->IsDereferenceOfParent() && epformat == eHonorPointers)
2051                     {
2052                         s.PutCString("->");
2053                     }
2054                     else
2055                     {
2056                         if (non_base_class_parent_type_info & ClangASTContext::eTypeIsPointer)
2057                         {
2058                             s.PutCString("->");
2059                         }
2060                         else if ((non_base_class_parent_type_info & ClangASTContext::eTypeHasChildren) &&
2061                                  !(non_base_class_parent_type_info & ClangASTContext::eTypeIsArray))
2062                         {
2063                             s.PutChar('.');
2064                         }
2065                     }
2066                 }
2067             }
2068 
2069             const char *name = GetName().GetCString();
2070             if (name)
2071             {
2072                 if (qualify_cxx_base_classes)
2073                 {
2074                     if (GetBaseClassPath (s))
2075                         s.PutCString("::");
2076                 }
2077                 s.PutCString(name);
2078             }
2079         }
2080     }
2081 
2082     if (is_deref_of_parent && epformat == eDereferencePointers)
2083     {
2084         s.PutChar(')');
2085     }
2086 }
2087 
2088 ValueObjectSP
2089 ValueObject::GetValueForExpressionPath(const char* expression,
2090                                        const char** first_unparsed,
2091                                        ExpressionPathScanEndReason* reason_to_stop,
2092                                        ExpressionPathEndResultType* final_value_type,
2093                                        const GetValueForExpressionPathOptions& options,
2094                                        ExpressionPathAftermath* final_task_on_target)
2095 {
2096 
2097     const char* dummy_first_unparsed;
2098     ExpressionPathScanEndReason dummy_reason_to_stop;
2099     ExpressionPathEndResultType dummy_final_value_type;
2100     ExpressionPathAftermath dummy_final_task_on_target = ValueObject::eNothing;
2101 
2102     ValueObjectSP ret_val = GetValueForExpressionPath_Impl(expression,
2103                                                            first_unparsed ? first_unparsed : &dummy_first_unparsed,
2104                                                            reason_to_stop ? reason_to_stop : &dummy_reason_to_stop,
2105                                                            final_value_type ? final_value_type : &dummy_final_value_type,
2106                                                            options,
2107                                                            final_task_on_target ? final_task_on_target : &dummy_final_task_on_target);
2108 
2109     if (!final_task_on_target || *final_task_on_target == ValueObject::eNothing)
2110     {
2111         return ret_val;
2112     }
2113     if (ret_val.get() && *final_value_type == ePlain) // I can only deref and takeaddress of plain objects
2114     {
2115         if (*final_task_on_target == ValueObject::eDereference)
2116         {
2117             Error error;
2118             ValueObjectSP final_value = ret_val->Dereference(error);
2119             if (error.Fail() || !final_value.get())
2120             {
2121                 *reason_to_stop = ValueObject::eDereferencingFailed;
2122                 *final_value_type = ValueObject::eInvalid;
2123                 return ValueObjectSP();
2124             }
2125             else
2126             {
2127                 *final_task_on_target = ValueObject::eNothing;
2128                 return final_value;
2129             }
2130         }
2131         if (*final_task_on_target == ValueObject::eTakeAddress)
2132         {
2133             Error error;
2134             ValueObjectSP final_value = ret_val->AddressOf(error);
2135             if (error.Fail() || !final_value.get())
2136             {
2137                 *reason_to_stop = ValueObject::eTakingAddressFailed;
2138                 *final_value_type = ValueObject::eInvalid;
2139                 return ValueObjectSP();
2140             }
2141             else
2142             {
2143                 *final_task_on_target = ValueObject::eNothing;
2144                 return final_value;
2145             }
2146         }
2147     }
2148     return ret_val; // final_task_on_target will still have its original value, so you know I did not do it
2149 }
2150 
2151 int
2152 ValueObject::GetValuesForExpressionPath(const char* expression,
2153                                         ValueObjectListSP& list,
2154                                         const char** first_unparsed,
2155                                         ExpressionPathScanEndReason* reason_to_stop,
2156                                         ExpressionPathEndResultType* final_value_type,
2157                                         const GetValueForExpressionPathOptions& options,
2158                                         ExpressionPathAftermath* final_task_on_target)
2159 {
2160     const char* dummy_first_unparsed;
2161     ExpressionPathScanEndReason dummy_reason_to_stop;
2162     ExpressionPathEndResultType dummy_final_value_type;
2163     ExpressionPathAftermath dummy_final_task_on_target = ValueObject::eNothing;
2164 
2165     ValueObjectSP ret_val = GetValueForExpressionPath_Impl(expression,
2166                                                            first_unparsed ? first_unparsed : &dummy_first_unparsed,
2167                                                            reason_to_stop ? reason_to_stop : &dummy_reason_to_stop,
2168                                                            final_value_type ? final_value_type : &dummy_final_value_type,
2169                                                            options,
2170                                                            final_task_on_target ? final_task_on_target : &dummy_final_task_on_target);
2171 
2172     if (!ret_val.get()) // if there are errors, I add nothing to the list
2173         return 0;
2174 
2175     if (*reason_to_stop != eArrayRangeOperatorMet)
2176     {
2177         // I need not expand a range, just post-process the final value and return
2178         if (!final_task_on_target || *final_task_on_target == ValueObject::eNothing)
2179         {
2180             list->Append(ret_val);
2181             return 1;
2182         }
2183         if (ret_val.get() && *final_value_type == ePlain) // I can only deref and takeaddress of plain objects
2184         {
2185             if (*final_task_on_target == ValueObject::eDereference)
2186             {
2187                 Error error;
2188                 ValueObjectSP final_value = ret_val->Dereference(error);
2189                 if (error.Fail() || !final_value.get())
2190                 {
2191                     *reason_to_stop = ValueObject::eDereferencingFailed;
2192                     *final_value_type = ValueObject::eInvalid;
2193                     return 0;
2194                 }
2195                 else
2196                 {
2197                     *final_task_on_target = ValueObject::eNothing;
2198                     list->Append(final_value);
2199                     return 1;
2200                 }
2201             }
2202             if (*final_task_on_target == ValueObject::eTakeAddress)
2203             {
2204                 Error error;
2205                 ValueObjectSP final_value = ret_val->AddressOf(error);
2206                 if (error.Fail() || !final_value.get())
2207                 {
2208                     *reason_to_stop = ValueObject::eTakingAddressFailed;
2209                     *final_value_type = ValueObject::eInvalid;
2210                     return 0;
2211                 }
2212                 else
2213                 {
2214                     *final_task_on_target = ValueObject::eNothing;
2215                     list->Append(final_value);
2216                     return 1;
2217                 }
2218             }
2219         }
2220     }
2221     else
2222     {
2223         return ExpandArraySliceExpression(first_unparsed ? *first_unparsed : dummy_first_unparsed,
2224                                           first_unparsed ? first_unparsed : &dummy_first_unparsed,
2225                                           ret_val,
2226                                           list,
2227                                           reason_to_stop ? reason_to_stop : &dummy_reason_to_stop,
2228                                           final_value_type ? final_value_type : &dummy_final_value_type,
2229                                           options,
2230                                           final_task_on_target ? final_task_on_target : &dummy_final_task_on_target);
2231     }
2232     // in any non-covered case, just do the obviously right thing
2233     list->Append(ret_val);
2234     return 1;
2235 }
2236 
2237 ValueObjectSP
2238 ValueObject::GetValueForExpressionPath_Impl(const char* expression_cstr,
2239                                             const char** first_unparsed,
2240                                             ExpressionPathScanEndReason* reason_to_stop,
2241                                             ExpressionPathEndResultType* final_result,
2242                                             const GetValueForExpressionPathOptions& options,
2243                                             ExpressionPathAftermath* what_next)
2244 {
2245     ValueObjectSP root = GetSP();
2246 
2247     if (!root.get())
2248         return ValueObjectSP();
2249 
2250     *first_unparsed = expression_cstr;
2251 
2252     while (true)
2253     {
2254 
2255         const char* expression_cstr = *first_unparsed; // hide the top level expression_cstr
2256 
2257         clang_type_t root_clang_type = root->GetClangType();
2258         clang_type_t pointee_clang_type;
2259         Flags root_clang_type_info,pointee_clang_type_info;
2260 
2261         root_clang_type_info = Flags(ClangASTContext::GetTypeInfo(root_clang_type, GetClangAST(), &pointee_clang_type));
2262         if (pointee_clang_type)
2263             pointee_clang_type_info = Flags(ClangASTContext::GetTypeInfo(pointee_clang_type, GetClangAST(), NULL));
2264 
2265         if (!expression_cstr || *expression_cstr == '\0')
2266         {
2267             *reason_to_stop = ValueObject::eEndOfString;
2268             return root;
2269         }
2270 
2271         switch (*expression_cstr)
2272         {
2273             case '-':
2274             {
2275                 if (options.m_check_dot_vs_arrow_syntax &&
2276                     root_clang_type_info.Test(ClangASTContext::eTypeIsPointer) ) // if you are trying to use -> on a non-pointer and I must catch the error
2277                 {
2278                     *first_unparsed = expression_cstr;
2279                     *reason_to_stop = ValueObject::eArrowInsteadOfDot;
2280                     *final_result = ValueObject::eInvalid;
2281                     return ValueObjectSP();
2282                 }
2283                 if (root_clang_type_info.Test(ClangASTContext::eTypeIsObjC) &&  // if yo are trying to extract an ObjC IVar when this is forbidden
2284                     root_clang_type_info.Test(ClangASTContext::eTypeIsPointer) &&
2285                     options.m_no_fragile_ivar)
2286                 {
2287                     *first_unparsed = expression_cstr;
2288                     *reason_to_stop = ValueObject::eFragileIVarNotAllowed;
2289                     *final_result = ValueObject::eInvalid;
2290                     return ValueObjectSP();
2291                 }
2292                 if (expression_cstr[1] != '>')
2293                 {
2294                     *first_unparsed = expression_cstr;
2295                     *reason_to_stop = ValueObject::eUnexpectedSymbol;
2296                     *final_result = ValueObject::eInvalid;
2297                     return ValueObjectSP();
2298                 }
2299                 expression_cstr++; // skip the -
2300             }
2301             case '.': // or fallthrough from ->
2302             {
2303                 if (options.m_check_dot_vs_arrow_syntax && *expression_cstr == '.' &&
2304                     root_clang_type_info.Test(ClangASTContext::eTypeIsPointer)) // if you are trying to use . on a pointer and I must catch the error
2305                 {
2306                     *first_unparsed = expression_cstr;
2307                     *reason_to_stop = ValueObject::eDotInsteadOfArrow;
2308                     *final_result = ValueObject::eInvalid;
2309                     return ValueObjectSP();
2310                 }
2311                 expression_cstr++; // skip .
2312                 const char *next_separator = strpbrk(expression_cstr+1,"-.[");
2313                 ConstString child_name;
2314                 if (!next_separator) // if no other separator just expand this last layer
2315                 {
2316                     child_name.SetCString (expression_cstr);
2317                     ValueObjectSP child_valobj_sp = root->GetChildMemberWithName(child_name, true);
2318 
2319                     if (child_valobj_sp.get()) // we know we are done, so just return
2320                     {
2321                         *first_unparsed = '\0';
2322                         *reason_to_stop = ValueObject::eEndOfString;
2323                         *final_result = ValueObject::ePlain;
2324                         return child_valobj_sp;
2325                     }
2326                     else if (options.m_no_synthetic_children == false) // let's try with synthetic children
2327                     {
2328                         child_valobj_sp = root->GetSyntheticValue(eNoSyntheticFilter)->GetChildMemberWithName(child_name, true);
2329                     }
2330 
2331                     // if we are here and options.m_no_synthetic_children is true, child_valobj_sp is going to be a NULL SP,
2332                     // so we hit the "else" branch, and return an error
2333                     if(child_valobj_sp.get()) // if it worked, just return
2334                     {
2335                         *first_unparsed = '\0';
2336                         *reason_to_stop = ValueObject::eEndOfString;
2337                         *final_result = ValueObject::ePlain;
2338                         return child_valobj_sp;
2339                     }
2340                     else
2341                     {
2342                         *first_unparsed = expression_cstr;
2343                         *reason_to_stop = ValueObject::eNoSuchChild;
2344                         *final_result = ValueObject::eInvalid;
2345                         return ValueObjectSP();
2346                     }
2347                 }
2348                 else // other layers do expand
2349                 {
2350                     child_name.SetCStringWithLength(expression_cstr, next_separator - expression_cstr);
2351                     ValueObjectSP child_valobj_sp = root->GetChildMemberWithName(child_name, true);
2352                     if (child_valobj_sp.get()) // store the new root and move on
2353                     {
2354                         root = child_valobj_sp;
2355                         *first_unparsed = next_separator;
2356                         *final_result = ValueObject::ePlain;
2357                         continue;
2358                     }
2359                     else if (options.m_no_synthetic_children == false) // let's try with synthetic children
2360                     {
2361                         child_valobj_sp = root->GetSyntheticValue(eUseSyntheticFilter)->GetChildMemberWithName(child_name, true);
2362                     }
2363 
2364                     // if we are here and options.m_no_synthetic_children is true, child_valobj_sp is going to be a NULL SP,
2365                     // so we hit the "else" branch, and return an error
2366                     if(child_valobj_sp.get()) // if it worked, move on
2367                     {
2368                         root = child_valobj_sp;
2369                         *first_unparsed = next_separator;
2370                         *final_result = ValueObject::ePlain;
2371                         continue;
2372                     }
2373                     else
2374                     {
2375                         *first_unparsed = expression_cstr;
2376                         *reason_to_stop = ValueObject::eNoSuchChild;
2377                         *final_result = ValueObject::eInvalid;
2378                         return ValueObjectSP();
2379                     }
2380                 }
2381                 break;
2382             }
2383             case '[':
2384             {
2385                 if (!root_clang_type_info.Test(ClangASTContext::eTypeIsArray) && !root_clang_type_info.Test(ClangASTContext::eTypeIsPointer)) // if this is not a T[] nor a T*
2386                 {
2387                     if (!root_clang_type_info.Test(ClangASTContext::eTypeIsScalar)) // if this is not even a scalar...
2388                     {
2389                         if (options.m_no_synthetic_children) // ...only chance left is synthetic
2390                         {
2391                             *first_unparsed = expression_cstr;
2392                             *reason_to_stop = ValueObject::eRangeOperatorInvalid;
2393                             *final_result = ValueObject::eInvalid;
2394                             return ValueObjectSP();
2395                         }
2396                     }
2397                     else if (!options.m_allow_bitfields_syntax) // if this is a scalar, check that we can expand bitfields
2398                     {
2399                         *first_unparsed = expression_cstr;
2400                         *reason_to_stop = ValueObject::eRangeOperatorNotAllowed;
2401                         *final_result = ValueObject::eInvalid;
2402                         return ValueObjectSP();
2403                     }
2404                 }
2405                 if (*(expression_cstr+1) == ']') // if this is an unbounded range it only works for arrays
2406                 {
2407                     if (!root_clang_type_info.Test(ClangASTContext::eTypeIsArray))
2408                     {
2409                         *first_unparsed = expression_cstr;
2410                         *reason_to_stop = ValueObject::eEmptyRangeNotAllowed;
2411                         *final_result = ValueObject::eInvalid;
2412                         return ValueObjectSP();
2413                     }
2414                     else // even if something follows, we cannot expand unbounded ranges, just let the caller do it
2415                     {
2416                         *first_unparsed = expression_cstr+2;
2417                         *reason_to_stop = ValueObject::eArrayRangeOperatorMet;
2418                         *final_result = ValueObject::eUnboundedRange;
2419                         return root;
2420                     }
2421                 }
2422                 const char *separator_position = ::strchr(expression_cstr+1,'-');
2423                 const char *close_bracket_position = ::strchr(expression_cstr+1,']');
2424                 if (!close_bracket_position) // if there is no ], this is a syntax error
2425                 {
2426                     *first_unparsed = expression_cstr;
2427                     *reason_to_stop = ValueObject::eUnexpectedSymbol;
2428                     *final_result = ValueObject::eInvalid;
2429                     return ValueObjectSP();
2430                 }
2431                 if (!separator_position || separator_position > close_bracket_position) // if no separator, this is either [] or [N]
2432                 {
2433                     char *end = NULL;
2434                     unsigned long index = ::strtoul (expression_cstr+1, &end, 0);
2435                     if (!end || end != close_bracket_position) // if something weird is in our way return an error
2436                     {
2437                         *first_unparsed = expression_cstr;
2438                         *reason_to_stop = ValueObject::eUnexpectedSymbol;
2439                         *final_result = ValueObject::eInvalid;
2440                         return ValueObjectSP();
2441                     }
2442                     if (end - expression_cstr == 1) // if this is [], only return a valid value for arrays
2443                     {
2444                         if (root_clang_type_info.Test(ClangASTContext::eTypeIsArray))
2445                         {
2446                             *first_unparsed = expression_cstr+2;
2447                             *reason_to_stop = ValueObject::eArrayRangeOperatorMet;
2448                             *final_result = ValueObject::eUnboundedRange;
2449                             return root;
2450                         }
2451                         else
2452                         {
2453                             *first_unparsed = expression_cstr;
2454                             *reason_to_stop = ValueObject::eEmptyRangeNotAllowed;
2455                             *final_result = ValueObject::eInvalid;
2456                             return ValueObjectSP();
2457                         }
2458                     }
2459                     // from here on we do have a valid index
2460                     if (root_clang_type_info.Test(ClangASTContext::eTypeIsArray))
2461                     {
2462                         ValueObjectSP child_valobj_sp = root->GetChildAtIndex(index, true);
2463                         if (!child_valobj_sp)
2464                             child_valobj_sp = root->GetSyntheticArrayMemberFromArray(index, true);
2465                         if (!child_valobj_sp)
2466                             if (root->HasSyntheticValue() && root->GetSyntheticValue(eUseSyntheticFilter)->GetNumChildren() > index)
2467                                 child_valobj_sp = root->GetSyntheticValue(eUseSyntheticFilter)->GetChildAtIndex(index, true);
2468                         if (child_valobj_sp)
2469                         {
2470                             root = child_valobj_sp;
2471                             *first_unparsed = end+1; // skip ]
2472                             *final_result = ValueObject::ePlain;
2473                             continue;
2474                         }
2475                         else
2476                         {
2477                             *first_unparsed = expression_cstr;
2478                             *reason_to_stop = ValueObject::eNoSuchChild;
2479                             *final_result = ValueObject::eInvalid;
2480                             return ValueObjectSP();
2481                         }
2482                     }
2483                     else if (root_clang_type_info.Test(ClangASTContext::eTypeIsPointer))
2484                     {
2485                         if (*what_next == ValueObject::eDereference &&  // if this is a ptr-to-scalar, I am accessing it by index and I would have deref'ed anyway, then do it now and use this as a bitfield
2486                             pointee_clang_type_info.Test(ClangASTContext::eTypeIsScalar))
2487                         {
2488                             Error error;
2489                             root = root->Dereference(error);
2490                             if (error.Fail() || !root.get())
2491                             {
2492                                 *first_unparsed = expression_cstr;
2493                                 *reason_to_stop = ValueObject::eDereferencingFailed;
2494                                 *final_result = ValueObject::eInvalid;
2495                                 return ValueObjectSP();
2496                             }
2497                             else
2498                             {
2499                                 *what_next = eNothing;
2500                                 continue;
2501                             }
2502                         }
2503                         else
2504                         {
2505                             if (ClangASTType::GetMinimumLanguage(root->GetClangAST(),
2506                                                                     root->GetClangType()) == eLanguageTypeObjC
2507                                 &&
2508                                 ClangASTContext::IsPointerType(ClangASTType::GetPointeeType(root->GetClangType())) == false
2509                                 &&
2510                                 root->HasSyntheticValue()
2511                                 &&
2512                                 options.m_no_synthetic_children == false)
2513                             {
2514                                 root = root->GetSyntheticValue(eUseSyntheticFilter)->GetChildAtIndex(index, true);
2515                             }
2516                             else
2517                                 root = root->GetSyntheticArrayMemberFromPointer(index, true);
2518                             if (!root.get())
2519                             {
2520                                 *first_unparsed = expression_cstr;
2521                                 *reason_to_stop = ValueObject::eNoSuchChild;
2522                                 *final_result = ValueObject::eInvalid;
2523                                 return ValueObjectSP();
2524                             }
2525                             else
2526                             {
2527                                 *first_unparsed = end+1; // skip ]
2528                                 *final_result = ValueObject::ePlain;
2529                                 continue;
2530                             }
2531                         }
2532                     }
2533                     else if (ClangASTContext::IsScalarType(root_clang_type))
2534                     {
2535                         root = root->GetSyntheticBitFieldChild(index, index, true);
2536                         if (!root.get())
2537                         {
2538                             *first_unparsed = expression_cstr;
2539                             *reason_to_stop = ValueObject::eNoSuchChild;
2540                             *final_result = ValueObject::eInvalid;
2541                             return ValueObjectSP();
2542                         }
2543                         else // we do not know how to expand members of bitfields, so we just return and let the caller do any further processing
2544                         {
2545                             *first_unparsed = end+1; // skip ]
2546                             *reason_to_stop = ValueObject::eBitfieldRangeOperatorMet;
2547                             *final_result = ValueObject::eBitfield;
2548                             return root;
2549                         }
2550                     }
2551                     else if (root->HasSyntheticValue() && options.m_no_synthetic_children == false)
2552                     {
2553                         root = root->GetSyntheticValue(eUseSyntheticFilter)->GetChildAtIndex(index, true);
2554                         if (!root.get())
2555                         {
2556                             *first_unparsed = expression_cstr;
2557                             *reason_to_stop = ValueObject::eNoSuchChild;
2558                             *final_result = ValueObject::eInvalid;
2559                             return ValueObjectSP();
2560                         }
2561                         else
2562                         {
2563                             *first_unparsed = end+1; // skip ]
2564                             *final_result = ValueObject::ePlain;
2565                             continue;
2566                         }
2567                     }
2568                     else
2569                     {
2570                         *first_unparsed = expression_cstr;
2571                         *reason_to_stop = ValueObject::eNoSuchChild;
2572                         *final_result = ValueObject::eInvalid;
2573                         return ValueObjectSP();
2574                     }
2575                 }
2576                 else // we have a low and a high index
2577                 {
2578                     char *end = NULL;
2579                     unsigned long index_lower = ::strtoul (expression_cstr+1, &end, 0);
2580                     if (!end || end != separator_position) // if something weird is in our way return an error
2581                     {
2582                         *first_unparsed = expression_cstr;
2583                         *reason_to_stop = ValueObject::eUnexpectedSymbol;
2584                         *final_result = ValueObject::eInvalid;
2585                         return ValueObjectSP();
2586                     }
2587                     unsigned long index_higher = ::strtoul (separator_position+1, &end, 0);
2588                     if (!end || end != close_bracket_position) // if something weird is in our way return an error
2589                     {
2590                         *first_unparsed = expression_cstr;
2591                         *reason_to_stop = ValueObject::eUnexpectedSymbol;
2592                         *final_result = ValueObject::eInvalid;
2593                         return ValueObjectSP();
2594                     }
2595                     if (index_lower > index_higher) // swap indices if required
2596                     {
2597                         unsigned long temp = index_lower;
2598                         index_lower = index_higher;
2599                         index_higher = temp;
2600                     }
2601                     if (root_clang_type_info.Test(ClangASTContext::eTypeIsScalar)) // expansion only works for scalars
2602                     {
2603                         root = root->GetSyntheticBitFieldChild(index_lower, index_higher, true);
2604                         if (!root.get())
2605                         {
2606                             *first_unparsed = expression_cstr;
2607                             *reason_to_stop = ValueObject::eNoSuchChild;
2608                             *final_result = ValueObject::eInvalid;
2609                             return ValueObjectSP();
2610                         }
2611                         else
2612                         {
2613                             *first_unparsed = end+1; // skip ]
2614                             *reason_to_stop = ValueObject::eBitfieldRangeOperatorMet;
2615                             *final_result = ValueObject::eBitfield;
2616                             return root;
2617                         }
2618                     }
2619                     else if (root_clang_type_info.Test(ClangASTContext::eTypeIsPointer) && // if this is a ptr-to-scalar, I am accessing it by index and I would have deref'ed anyway, then do it now and use this as a bitfield
2620                              *what_next == ValueObject::eDereference &&
2621                              pointee_clang_type_info.Test(ClangASTContext::eTypeIsScalar))
2622                     {
2623                         Error error;
2624                         root = root->Dereference(error);
2625                         if (error.Fail() || !root.get())
2626                         {
2627                             *first_unparsed = expression_cstr;
2628                             *reason_to_stop = ValueObject::eDereferencingFailed;
2629                             *final_result = ValueObject::eInvalid;
2630                             return ValueObjectSP();
2631                         }
2632                         else
2633                         {
2634                             *what_next = ValueObject::eNothing;
2635                             continue;
2636                         }
2637                     }
2638                     else
2639                     {
2640                         *first_unparsed = expression_cstr;
2641                         *reason_to_stop = ValueObject::eArrayRangeOperatorMet;
2642                         *final_result = ValueObject::eBoundedRange;
2643                         return root;
2644                     }
2645                 }
2646                 break;
2647             }
2648             default: // some non-separator is in the way
2649             {
2650                 *first_unparsed = expression_cstr;
2651                 *reason_to_stop = ValueObject::eUnexpectedSymbol;
2652                 *final_result = ValueObject::eInvalid;
2653                 return ValueObjectSP();
2654                 break;
2655             }
2656         }
2657     }
2658 }
2659 
2660 int
2661 ValueObject::ExpandArraySliceExpression(const char* expression_cstr,
2662                                         const char** first_unparsed,
2663                                         ValueObjectSP root,
2664                                         ValueObjectListSP& list,
2665                                         ExpressionPathScanEndReason* reason_to_stop,
2666                                         ExpressionPathEndResultType* final_result,
2667                                         const GetValueForExpressionPathOptions& options,
2668                                         ExpressionPathAftermath* what_next)
2669 {
2670     if (!root.get())
2671         return 0;
2672 
2673     *first_unparsed = expression_cstr;
2674 
2675     while (true)
2676     {
2677 
2678         const char* expression_cstr = *first_unparsed; // hide the top level expression_cstr
2679 
2680         clang_type_t root_clang_type = root->GetClangType();
2681         clang_type_t pointee_clang_type;
2682         Flags root_clang_type_info,pointee_clang_type_info;
2683 
2684         root_clang_type_info = Flags(ClangASTContext::GetTypeInfo(root_clang_type, GetClangAST(), &pointee_clang_type));
2685         if (pointee_clang_type)
2686             pointee_clang_type_info = Flags(ClangASTContext::GetTypeInfo(pointee_clang_type, GetClangAST(), NULL));
2687 
2688         if (!expression_cstr || *expression_cstr == '\0')
2689         {
2690             *reason_to_stop = ValueObject::eEndOfString;
2691             list->Append(root);
2692             return 1;
2693         }
2694 
2695         switch (*expression_cstr)
2696         {
2697             case '[':
2698             {
2699                 if (!root_clang_type_info.Test(ClangASTContext::eTypeIsArray) && !root_clang_type_info.Test(ClangASTContext::eTypeIsPointer)) // if this is not a T[] nor a T*
2700                 {
2701                     if (!root_clang_type_info.Test(ClangASTContext::eTypeIsScalar)) // if this is not even a scalar, this syntax is just plain wrong!
2702                     {
2703                         *first_unparsed = expression_cstr;
2704                         *reason_to_stop = ValueObject::eRangeOperatorInvalid;
2705                         *final_result = ValueObject::eInvalid;
2706                         return 0;
2707                     }
2708                     else if (!options.m_allow_bitfields_syntax) // if this is a scalar, check that we can expand bitfields
2709                     {
2710                         *first_unparsed = expression_cstr;
2711                         *reason_to_stop = ValueObject::eRangeOperatorNotAllowed;
2712                         *final_result = ValueObject::eInvalid;
2713                         return 0;
2714                     }
2715                 }
2716                 if (*(expression_cstr+1) == ']') // if this is an unbounded range it only works for arrays
2717                 {
2718                     if (!root_clang_type_info.Test(ClangASTContext::eTypeIsArray))
2719                     {
2720                         *first_unparsed = expression_cstr;
2721                         *reason_to_stop = ValueObject::eEmptyRangeNotAllowed;
2722                         *final_result = ValueObject::eInvalid;
2723                         return 0;
2724                     }
2725                     else // expand this into list
2726                     {
2727                         int max_index = root->GetNumChildren() - 1;
2728                         for (int index = 0; index < max_index; index++)
2729                         {
2730                             ValueObjectSP child =
2731                                 root->GetChildAtIndex(index, true);
2732                             list->Append(child);
2733                         }
2734                         *first_unparsed = expression_cstr+2;
2735                         *reason_to_stop = ValueObject::eRangeOperatorExpanded;
2736                         *final_result = ValueObject::eValueObjectList;
2737                         return max_index; // tell me number of items I added to the VOList
2738                     }
2739                 }
2740                 const char *separator_position = ::strchr(expression_cstr+1,'-');
2741                 const char *close_bracket_position = ::strchr(expression_cstr+1,']');
2742                 if (!close_bracket_position) // if there is no ], this is a syntax error
2743                 {
2744                     *first_unparsed = expression_cstr;
2745                     *reason_to_stop = ValueObject::eUnexpectedSymbol;
2746                     *final_result = ValueObject::eInvalid;
2747                     return 0;
2748                 }
2749                 if (!separator_position || separator_position > close_bracket_position) // if no separator, this is either [] or [N]
2750                 {
2751                     char *end = NULL;
2752                     unsigned long index = ::strtoul (expression_cstr+1, &end, 0);
2753                     if (!end || end != close_bracket_position) // if something weird is in our way return an error
2754                     {
2755                         *first_unparsed = expression_cstr;
2756                         *reason_to_stop = ValueObject::eUnexpectedSymbol;
2757                         *final_result = ValueObject::eInvalid;
2758                         return 0;
2759                     }
2760                     if (end - expression_cstr == 1) // if this is [], only return a valid value for arrays
2761                     {
2762                         if (root_clang_type_info.Test(ClangASTContext::eTypeIsArray))
2763                         {
2764                             int max_index = root->GetNumChildren() - 1;
2765                             for (int index = 0; index < max_index; index++)
2766                             {
2767                                 ValueObjectSP child =
2768                                 root->GetChildAtIndex(index, true);
2769                                 list->Append(child);
2770                             }
2771                             *first_unparsed = expression_cstr+2;
2772                             *reason_to_stop = ValueObject::eRangeOperatorExpanded;
2773                             *final_result = ValueObject::eValueObjectList;
2774                             return max_index; // tell me number of items I added to the VOList
2775                         }
2776                         else
2777                         {
2778                             *first_unparsed = expression_cstr;
2779                             *reason_to_stop = ValueObject::eEmptyRangeNotAllowed;
2780                             *final_result = ValueObject::eInvalid;
2781                             return 0;
2782                         }
2783                     }
2784                     // from here on we do have a valid index
2785                     if (root_clang_type_info.Test(ClangASTContext::eTypeIsArray))
2786                     {
2787                         root = root->GetChildAtIndex(index, true);
2788                         if (!root.get())
2789                         {
2790                             *first_unparsed = expression_cstr;
2791                             *reason_to_stop = ValueObject::eNoSuchChild;
2792                             *final_result = ValueObject::eInvalid;
2793                             return 0;
2794                         }
2795                         else
2796                         {
2797                             list->Append(root);
2798                             *first_unparsed = end+1; // skip ]
2799                             *reason_to_stop = ValueObject::eRangeOperatorExpanded;
2800                             *final_result = ValueObject::eValueObjectList;
2801                             return 1;
2802                         }
2803                     }
2804                     else if (root_clang_type_info.Test(ClangASTContext::eTypeIsPointer))
2805                     {
2806                         if (*what_next == ValueObject::eDereference &&  // if this is a ptr-to-scalar, I am accessing it by index and I would have deref'ed anyway, then do it now and use this as a bitfield
2807                             pointee_clang_type_info.Test(ClangASTContext::eTypeIsScalar))
2808                         {
2809                             Error error;
2810                             root = root->Dereference(error);
2811                             if (error.Fail() || !root.get())
2812                             {
2813                                 *first_unparsed = expression_cstr;
2814                                 *reason_to_stop = ValueObject::eDereferencingFailed;
2815                                 *final_result = ValueObject::eInvalid;
2816                                 return 0;
2817                             }
2818                             else
2819                             {
2820                                 *what_next = eNothing;
2821                                 continue;
2822                             }
2823                         }
2824                         else
2825                         {
2826                             root = root->GetSyntheticArrayMemberFromPointer(index, true);
2827                             if (!root.get())
2828                             {
2829                                 *first_unparsed = expression_cstr;
2830                                 *reason_to_stop = ValueObject::eNoSuchChild;
2831                                 *final_result = ValueObject::eInvalid;
2832                                 return 0;
2833                             }
2834                             else
2835                             {
2836                                 list->Append(root);
2837                                 *first_unparsed = end+1; // skip ]
2838                                 *reason_to_stop = ValueObject::eRangeOperatorExpanded;
2839                                 *final_result = ValueObject::eValueObjectList;
2840                                 return 1;
2841                             }
2842                         }
2843                     }
2844                     else /*if (ClangASTContext::IsScalarType(root_clang_type))*/
2845                     {
2846                         root = root->GetSyntheticBitFieldChild(index, index, true);
2847                         if (!root.get())
2848                         {
2849                             *first_unparsed = expression_cstr;
2850                             *reason_to_stop = ValueObject::eNoSuchChild;
2851                             *final_result = ValueObject::eInvalid;
2852                             return 0;
2853                         }
2854                         else // we do not know how to expand members of bitfields, so we just return and let the caller do any further processing
2855                         {
2856                             list->Append(root);
2857                             *first_unparsed = end+1; // skip ]
2858                             *reason_to_stop = ValueObject::eRangeOperatorExpanded;
2859                             *final_result = ValueObject::eValueObjectList;
2860                             return 1;
2861                         }
2862                     }
2863                 }
2864                 else // we have a low and a high index
2865                 {
2866                     char *end = NULL;
2867                     unsigned long index_lower = ::strtoul (expression_cstr+1, &end, 0);
2868                     if (!end || end != separator_position) // if something weird is in our way return an error
2869                     {
2870                         *first_unparsed = expression_cstr;
2871                         *reason_to_stop = ValueObject::eUnexpectedSymbol;
2872                         *final_result = ValueObject::eInvalid;
2873                         return 0;
2874                     }
2875                     unsigned long index_higher = ::strtoul (separator_position+1, &end, 0);
2876                     if (!end || end != close_bracket_position) // if something weird is in our way return an error
2877                     {
2878                         *first_unparsed = expression_cstr;
2879                         *reason_to_stop = ValueObject::eUnexpectedSymbol;
2880                         *final_result = ValueObject::eInvalid;
2881                         return 0;
2882                     }
2883                     if (index_lower > index_higher) // swap indices if required
2884                     {
2885                         unsigned long temp = index_lower;
2886                         index_lower = index_higher;
2887                         index_higher = temp;
2888                     }
2889                     if (root_clang_type_info.Test(ClangASTContext::eTypeIsScalar)) // expansion only works for scalars
2890                     {
2891                         root = root->GetSyntheticBitFieldChild(index_lower, index_higher, true);
2892                         if (!root.get())
2893                         {
2894                             *first_unparsed = expression_cstr;
2895                             *reason_to_stop = ValueObject::eNoSuchChild;
2896                             *final_result = ValueObject::eInvalid;
2897                             return 0;
2898                         }
2899                         else
2900                         {
2901                             list->Append(root);
2902                             *first_unparsed = end+1; // skip ]
2903                             *reason_to_stop = ValueObject::eRangeOperatorExpanded;
2904                             *final_result = ValueObject::eValueObjectList;
2905                             return 1;
2906                         }
2907                     }
2908                     else if (root_clang_type_info.Test(ClangASTContext::eTypeIsPointer) && // if this is a ptr-to-scalar, I am accessing it by index and I would have deref'ed anyway, then do it now and use this as a bitfield
2909                              *what_next == ValueObject::eDereference &&
2910                              pointee_clang_type_info.Test(ClangASTContext::eTypeIsScalar))
2911                     {
2912                         Error error;
2913                         root = root->Dereference(error);
2914                         if (error.Fail() || !root.get())
2915                         {
2916                             *first_unparsed = expression_cstr;
2917                             *reason_to_stop = ValueObject::eDereferencingFailed;
2918                             *final_result = ValueObject::eInvalid;
2919                             return 0;
2920                         }
2921                         else
2922                         {
2923                             *what_next = ValueObject::eNothing;
2924                             continue;
2925                         }
2926                     }
2927                     else
2928                     {
2929                         for (unsigned long index = index_lower;
2930                              index <= index_higher; index++)
2931                         {
2932                             ValueObjectSP child =
2933                                 root->GetChildAtIndex(index, true);
2934                             list->Append(child);
2935                         }
2936                         *first_unparsed = end+1;
2937                         *reason_to_stop = ValueObject::eRangeOperatorExpanded;
2938                         *final_result = ValueObject::eValueObjectList;
2939                         return index_higher-index_lower+1; // tell me number of items I added to the VOList
2940                     }
2941                 }
2942                 break;
2943             }
2944             default: // some non-[ separator, or something entirely wrong, is in the way
2945             {
2946                 *first_unparsed = expression_cstr;
2947                 *reason_to_stop = ValueObject::eUnexpectedSymbol;
2948                 *final_result = ValueObject::eInvalid;
2949                 return 0;
2950                 break;
2951             }
2952         }
2953     }
2954 }
2955 
2956 void
2957 ValueObject::DumpValueObject
2958 (
2959     Stream &s,
2960     ValueObject *valobj,
2961     const char *root_valobj_name,
2962     uint32_t ptr_depth,
2963     uint32_t curr_depth,
2964     uint32_t max_depth,
2965     bool show_types,
2966     bool show_location,
2967     bool use_objc,
2968     DynamicValueType use_dynamic,
2969     bool use_synth,
2970     bool scope_already_checked,
2971     bool flat_output,
2972     uint32_t omit_summary_depth,
2973     bool ignore_cap
2974 )
2975 {
2976     if (valobj)
2977     {
2978         bool update_success = valobj->UpdateValueIfNeeded (use_dynamic, true);
2979 
2980         if (update_success && use_dynamic != eNoDynamicValues)
2981         {
2982             ValueObject *dynamic_value = valobj->GetDynamicValue(use_dynamic).get();
2983             if (dynamic_value)
2984                 valobj = dynamic_value;
2985         }
2986 
2987         clang_type_t clang_type = valobj->GetClangType();
2988 
2989         const Flags type_flags (ClangASTContext::GetTypeInfo (clang_type, NULL, NULL));
2990         const char *err_cstr = NULL;
2991         const bool has_children = type_flags.Test (ClangASTContext::eTypeHasChildren);
2992         const bool has_value = type_flags.Test (ClangASTContext::eTypeHasValue);
2993 
2994         const bool print_valobj = flat_output == false || has_value;
2995 
2996         if (print_valobj)
2997         {
2998             if (show_location)
2999             {
3000                 s.Printf("%s: ", valobj->GetLocationAsCString());
3001             }
3002 
3003             s.Indent();
3004 
3005             // Always show the type for the top level items.
3006             if (show_types || (curr_depth == 0 && !flat_output))
3007             {
3008                 const char* typeName = valobj->GetTypeName().AsCString("<invalid type>");
3009                 s.Printf("(%s", typeName);
3010                 // only show dynamic types if the user really wants to see types
3011                 if (show_types && use_dynamic != eNoDynamicValues &&
3012                     (/*strstr(typeName, "id") == typeName ||*/
3013                      ClangASTType::GetMinimumLanguage(valobj->GetClangAST(), valobj->GetClangType()) == eLanguageTypeObjC))
3014                 {
3015                     Process* process = valobj->GetUpdatePoint().GetProcessSP().get();
3016                     if (process == NULL)
3017                         s.Printf(", dynamic type: unknown) ");
3018                     else
3019                     {
3020                         ObjCLanguageRuntime *runtime = process->GetObjCLanguageRuntime();
3021                         if (runtime == NULL)
3022                             s.Printf(", dynamic type: unknown) ");
3023                         else
3024                         {
3025                             ObjCLanguageRuntime::ObjCISA isa = runtime->GetISA(*valobj);
3026                             if (!runtime->IsValidISA(isa))
3027                                 s.Printf(", dynamic type: unknown) ");
3028                             else
3029                                 s.Printf(", dynamic type: %s) ",
3030                                          runtime->GetActualTypeName(isa).GetCString());
3031                         }
3032                     }
3033                 }
3034                 else
3035                     s.Printf(") ");
3036             }
3037 
3038 
3039             if (flat_output)
3040             {
3041                 // If we are showing types, also qualify the C++ base classes
3042                 const bool qualify_cxx_base_classes = show_types;
3043                 valobj->GetExpressionPath(s, qualify_cxx_base_classes);
3044                 s.PutCString(" =");
3045             }
3046             else
3047             {
3048                 const char *name_cstr = root_valobj_name ? root_valobj_name : valobj->GetName().AsCString("");
3049                 s.Printf ("%s =", name_cstr);
3050             }
3051 
3052             if (!scope_already_checked && !valobj->IsInScope())
3053             {
3054                 err_cstr = "out of scope";
3055             }
3056         }
3057 
3058         const char *val_cstr = NULL;
3059         const char *sum_cstr = NULL;
3060         SummaryFormat* entry = valobj->GetSummaryFormat().get();
3061 
3062         if (omit_summary_depth > 0)
3063             entry = NULL;
3064 
3065         if (err_cstr == NULL)
3066         {
3067             val_cstr = valobj->GetValueAsCString();
3068             err_cstr = valobj->GetError().AsCString();
3069         }
3070 
3071         if (err_cstr)
3072         {
3073             s.Printf (" <%s>\n", err_cstr);
3074         }
3075         else
3076         {
3077             const bool is_ref = type_flags.Test (ClangASTContext::eTypeIsReference);
3078             if (print_valobj)
3079             {
3080 
3081                 sum_cstr = (omit_summary_depth == 0) ? valobj->GetSummaryAsCString() : NULL;
3082 
3083                 // We must calculate this value in realtime because entry might alter this variable's value
3084                 // (e.g. by saying ${var%fmt}) and render precached values useless
3085                 if (val_cstr && (!entry || entry->DoesPrintValue() || !sum_cstr))
3086                     s.Printf(" %s", valobj->GetValueAsCString());
3087 
3088                 if (sum_cstr)
3089                 {
3090                     // for some reason, using %@ (ObjC description) in a summary string, makes
3091                     // us believe we need to reset ourselves, thus invalidating the content of
3092                     // sum_cstr. Thus, IF we had a valid sum_cstr before, but it is now empty
3093                     // let us recalculate it!
3094                     if (sum_cstr[0] == '\0')
3095                         s.Printf(" %s", valobj->GetSummaryAsCString());
3096                     else
3097                         s.Printf(" %s", sum_cstr);
3098                 }
3099 
3100                 if (use_objc)
3101                 {
3102                     const char *object_desc = valobj->GetObjectDescription();
3103                     if (object_desc)
3104                         s.Printf(" %s\n", object_desc);
3105                     else
3106                         s.Printf (" [no Objective-C description available]\n");
3107                     return;
3108                 }
3109             }
3110 
3111             if (curr_depth < max_depth)
3112             {
3113                 // We will show children for all concrete types. We won't show
3114                 // pointer contents unless a pointer depth has been specified.
3115                 // We won't reference contents unless the reference is the
3116                 // root object (depth of zero).
3117                 bool print_children = true;
3118 
3119                 // Use a new temporary pointer depth in case we override the
3120                 // current pointer depth below...
3121                 uint32_t curr_ptr_depth = ptr_depth;
3122 
3123                 const bool is_ptr = type_flags.Test (ClangASTContext::eTypeIsPointer);
3124                 if (is_ptr || is_ref)
3125                 {
3126                     // We have a pointer or reference whose value is an address.
3127                     // Make sure that address is not NULL
3128                     AddressType ptr_address_type;
3129                     if (valobj->GetPointerValue (&ptr_address_type) == 0)
3130                         print_children = false;
3131 
3132                     else if (is_ref && curr_depth == 0)
3133                     {
3134                         // If this is the root object (depth is zero) that we are showing
3135                         // and it is a reference, and no pointer depth has been supplied
3136                         // print out what it references. Don't do this at deeper depths
3137                         // otherwise we can end up with infinite recursion...
3138                         curr_ptr_depth = 1;
3139                     }
3140 
3141                     if (curr_ptr_depth == 0)
3142                         print_children = false;
3143                 }
3144 
3145                 if (print_children && (!entry || entry->DoesPrintChildren() || !sum_cstr))
3146                 {
3147                     ValueObjectSP synth_valobj = valobj->GetSyntheticValue(use_synth ?
3148                                                                          eUseSyntheticFilter :
3149                                                                          eNoSyntheticFilter);
3150                     uint32_t num_children = synth_valobj->GetNumChildren();
3151                     bool print_dotdotdot = false;
3152                     if (num_children)
3153                     {
3154                         if (flat_output)
3155                         {
3156                             if (print_valobj)
3157                                 s.EOL();
3158                         }
3159                         else
3160                         {
3161                             if (print_valobj)
3162                                 s.PutCString(is_ref ? ": {\n" : " {\n");
3163                             s.IndentMore();
3164                         }
3165 
3166                         uint32_t max_num_children = valobj->GetUpdatePoint().GetTargetSP()->GetMaximumNumberOfChildrenToDisplay();
3167 
3168                         if (num_children > max_num_children && !ignore_cap)
3169                         {
3170                             num_children = max_num_children;
3171                             print_dotdotdot = true;
3172                         }
3173 
3174                         for (uint32_t idx=0; idx<num_children; ++idx)
3175                         {
3176                             ValueObjectSP child_sp(synth_valobj->GetChildAtIndex(idx, true));
3177                             if (child_sp.get())
3178                             {
3179                                 DumpValueObject (s,
3180                                                  child_sp.get(),
3181                                                  NULL,
3182                                                  (is_ptr || is_ref) ? curr_ptr_depth - 1 : curr_ptr_depth,
3183                                                  curr_depth + 1,
3184                                                  max_depth,
3185                                                  show_types,
3186                                                  show_location,
3187                                                  false,
3188                                                  use_dynamic,
3189                                                  use_synth,
3190                                                  true,
3191                                                  flat_output,
3192                                                  omit_summary_depth > 1 ? omit_summary_depth - 1 : 0,
3193                                                  ignore_cap);
3194                             }
3195                         }
3196 
3197                         if (!flat_output)
3198                         {
3199                             if (print_dotdotdot)
3200                             {
3201                                 valobj->GetUpdatePoint().GetTargetSP()->GetDebugger().GetCommandInterpreter().ChildrenTruncated();
3202                                 s.Indent("...\n");
3203                             }
3204                             s.IndentLess();
3205                             s.Indent("}\n");
3206                         }
3207                     }
3208                     else if (has_children)
3209                     {
3210                         // Aggregate, no children...
3211                         if (print_valobj)
3212                             s.PutCString(" {}\n");
3213                     }
3214                     else
3215                     {
3216                         if (print_valobj)
3217                             s.EOL();
3218                     }
3219 
3220                 }
3221                 else
3222                 {
3223                     s.EOL();
3224                 }
3225             }
3226             else
3227             {
3228                 if (has_children && print_valobj)
3229                 {
3230                     s.PutCString("{...}\n");
3231                 }
3232             }
3233         }
3234     }
3235 }
3236 
3237 
3238 ValueObjectSP
3239 ValueObject::CreateConstantValue (const ConstString &name)
3240 {
3241     ValueObjectSP valobj_sp;
3242 
3243     if (UpdateValueIfNeeded(false) && m_error.Success())
3244     {
3245         ExecutionContextScope *exe_scope = GetExecutionContextScope();
3246         if (exe_scope)
3247         {
3248             ExecutionContext exe_ctx;
3249             exe_scope->CalculateExecutionContext(exe_ctx);
3250 
3251             clang::ASTContext *ast = GetClangAST ();
3252 
3253             DataExtractor data;
3254             data.SetByteOrder (m_data.GetByteOrder());
3255             data.SetAddressByteSize(m_data.GetAddressByteSize());
3256 
3257             m_error = m_value.GetValueAsData (&exe_ctx, ast, data, 0, GetModule());
3258 
3259             valobj_sp = ValueObjectConstResult::Create (exe_scope,
3260                                                         ast,
3261                                                         GetClangType(),
3262                                                         name,
3263                                                         data,
3264 													    GetAddressOf());
3265         }
3266     }
3267 
3268     if (!valobj_sp)
3269     {
3270         valobj_sp = ValueObjectConstResult::Create (NULL, m_error);
3271     }
3272     return valobj_sp;
3273 }
3274 
3275 ValueObjectSP
3276 ValueObject::Dereference (Error &error)
3277 {
3278     if (m_deref_valobj)
3279         return m_deref_valobj->GetSP();
3280 
3281     const bool is_pointer_type = IsPointerType();
3282     if (is_pointer_type)
3283     {
3284         bool omit_empty_base_classes = true;
3285         bool ignore_array_bounds = false;
3286 
3287         std::string child_name_str;
3288         uint32_t child_byte_size = 0;
3289         int32_t child_byte_offset = 0;
3290         uint32_t child_bitfield_bit_size = 0;
3291         uint32_t child_bitfield_bit_offset = 0;
3292         bool child_is_base_class = false;
3293         bool child_is_deref_of_parent = false;
3294         const bool transparent_pointers = false;
3295         clang::ASTContext *clang_ast = GetClangAST();
3296         clang_type_t clang_type = GetClangType();
3297         clang_type_t child_clang_type;
3298 
3299         ExecutionContext exe_ctx;
3300         GetExecutionContextScope()->CalculateExecutionContext (exe_ctx);
3301 
3302         child_clang_type = ClangASTContext::GetChildClangTypeAtIndex (&exe_ctx,
3303                                                                       clang_ast,
3304                                                                       GetName().GetCString(),
3305                                                                       clang_type,
3306                                                                       0,
3307                                                                       transparent_pointers,
3308                                                                       omit_empty_base_classes,
3309                                                                       ignore_array_bounds,
3310                                                                       child_name_str,
3311                                                                       child_byte_size,
3312                                                                       child_byte_offset,
3313                                                                       child_bitfield_bit_size,
3314                                                                       child_bitfield_bit_offset,
3315                                                                       child_is_base_class,
3316                                                                       child_is_deref_of_parent);
3317         if (child_clang_type && child_byte_size)
3318         {
3319             ConstString child_name;
3320             if (!child_name_str.empty())
3321                 child_name.SetCString (child_name_str.c_str());
3322 
3323             m_deref_valobj = new ValueObjectChild (*this,
3324                                                    clang_ast,
3325                                                    child_clang_type,
3326                                                    child_name,
3327                                                    child_byte_size,
3328                                                    child_byte_offset,
3329                                                    child_bitfield_bit_size,
3330                                                    child_bitfield_bit_offset,
3331                                                    child_is_base_class,
3332                                                    child_is_deref_of_parent,
3333                                                    eAddressTypeInvalid);
3334         }
3335     }
3336 
3337     if (m_deref_valobj)
3338     {
3339         error.Clear();
3340         return m_deref_valobj->GetSP();
3341     }
3342     else
3343     {
3344         StreamString strm;
3345         GetExpressionPath(strm, true);
3346 
3347         if (is_pointer_type)
3348             error.SetErrorStringWithFormat("dereference failed: (%s) %s", GetTypeName().AsCString("<invalid type>"), strm.GetString().c_str());
3349         else
3350             error.SetErrorStringWithFormat("not a pointer type: (%s) %s", GetTypeName().AsCString("<invalid type>"), strm.GetString().c_str());
3351         return ValueObjectSP();
3352     }
3353 }
3354 
3355 ValueObjectSP
3356 ValueObject::AddressOf (Error &error)
3357 {
3358     if (m_addr_of_valobj_sp)
3359         return m_addr_of_valobj_sp;
3360 
3361     AddressType address_type = eAddressTypeInvalid;
3362     const bool scalar_is_load_address = false;
3363     addr_t addr = GetAddressOf (scalar_is_load_address, &address_type);
3364     error.Clear();
3365     if (addr != LLDB_INVALID_ADDRESS)
3366     {
3367         switch (address_type)
3368         {
3369         default:
3370         case eAddressTypeInvalid:
3371             {
3372                 StreamString expr_path_strm;
3373                 GetExpressionPath(expr_path_strm, true);
3374                 error.SetErrorStringWithFormat("'%s' is not in memory", expr_path_strm.GetString().c_str());
3375             }
3376             break;
3377 
3378         case eAddressTypeFile:
3379         case eAddressTypeLoad:
3380         case eAddressTypeHost:
3381             {
3382                 clang::ASTContext *ast = GetClangAST();
3383                 clang_type_t clang_type = GetClangType();
3384                 if (ast && clang_type)
3385                 {
3386                     std::string name (1, '&');
3387                     name.append (m_name.AsCString(""));
3388                     m_addr_of_valobj_sp = ValueObjectConstResult::Create (GetExecutionContextScope(),
3389                                                                           ast,
3390                                                                           ClangASTContext::CreatePointerType (ast, clang_type),
3391                                                                           ConstString (name.c_str()),
3392                                                                           addr,
3393                                                                           eAddressTypeInvalid,
3394                                                                           m_data.GetAddressByteSize());
3395                 }
3396             }
3397             break;
3398         }
3399     }
3400     return m_addr_of_valobj_sp;
3401 }
3402 
3403 
3404 ValueObjectSP
3405 ValueObject::CastPointerType (const char *name, ClangASTType &clang_ast_type)
3406 {
3407     ValueObjectSP valobj_sp;
3408     AddressType address_type;
3409     addr_t ptr_value = GetPointerValue (&address_type);
3410 
3411     if (ptr_value != LLDB_INVALID_ADDRESS)
3412     {
3413         Address ptr_addr (NULL, ptr_value);
3414 
3415         valobj_sp = ValueObjectMemory::Create (GetExecutionContextScope(),
3416                                                name,
3417                                                ptr_addr,
3418                                                clang_ast_type);
3419     }
3420     return valobj_sp;
3421 }
3422 
3423 ValueObjectSP
3424 ValueObject::CastPointerType (const char *name, TypeSP &type_sp)
3425 {
3426     ValueObjectSP valobj_sp;
3427     AddressType address_type;
3428     addr_t ptr_value = GetPointerValue (&address_type);
3429 
3430     if (ptr_value != LLDB_INVALID_ADDRESS)
3431     {
3432         Address ptr_addr (NULL, ptr_value);
3433 
3434         valobj_sp = ValueObjectMemory::Create (GetExecutionContextScope(),
3435                                                name,
3436                                                ptr_addr,
3437                                                type_sp);
3438     }
3439     return valobj_sp;
3440 }
3441 
3442 ValueObject::EvaluationPoint::EvaluationPoint () :
3443     ExecutionContextScope(),
3444     m_thread_id (LLDB_INVALID_UID),
3445     m_mod_id ()
3446 {
3447 }
3448 
3449 ValueObject::EvaluationPoint::EvaluationPoint (ExecutionContextScope *exe_scope, bool use_selected):
3450     ExecutionContextScope (),
3451     m_needs_update (true),
3452     m_first_update (true),
3453     m_thread_id (LLDB_INVALID_THREAD_ID),
3454     m_mod_id ()
3455 
3456 {
3457     ExecutionContext exe_ctx;
3458 
3459     if (exe_scope)
3460         exe_scope->CalculateExecutionContext(exe_ctx);
3461     Target *target = exe_ctx.GetTargetPtr();
3462     if (target != NULL)
3463     {
3464         m_target_sp = target;
3465         m_process_sp = exe_ctx.GetProcessSP();
3466         if (!m_process_sp)
3467             m_process_sp = target->GetProcessSP();
3468 
3469         if (m_process_sp)
3470         {
3471             m_mod_id = m_process_sp->GetModID();
3472 
3473             Thread *thread = exe_ctx.GetThreadPtr();
3474 
3475             if (thread == NULL)
3476             {
3477                 if (use_selected)
3478                     thread = m_process_sp->GetThreadList().GetSelectedThread().get();
3479             }
3480 
3481             if (thread != NULL)
3482             {
3483                 m_thread_id = thread->GetIndexID();
3484 
3485                 StackFrame *frame = exe_ctx.GetFramePtr();
3486                 if (frame == NULL)
3487                 {
3488                     if (use_selected)
3489                     {
3490                         frame = thread->GetSelectedFrame().get();
3491                         if (frame)
3492                             m_stack_id = frame->GetStackID();
3493                     }
3494                 }
3495                 else
3496                     m_stack_id = frame->GetStackID();
3497             }
3498         }
3499     }
3500 }
3501 
3502 ValueObject::EvaluationPoint::EvaluationPoint (const ValueObject::EvaluationPoint &rhs) :
3503     m_needs_update(true),
3504     m_first_update(true),
3505     m_target_sp (rhs.m_target_sp),
3506     m_process_sp (rhs.m_process_sp),
3507     m_thread_id (rhs.m_thread_id),
3508     m_stack_id (rhs.m_stack_id),
3509     m_mod_id ()
3510 {
3511 }
3512 
3513 ValueObject::EvaluationPoint::~EvaluationPoint ()
3514 {
3515 }
3516 
3517 Target *
3518 ValueObject::EvaluationPoint::CalculateTarget ()
3519 {
3520     return m_target_sp.get();
3521 }
3522 
3523 Process *
3524 ValueObject::EvaluationPoint::CalculateProcess ()
3525 {
3526     return m_process_sp.get();
3527 }
3528 
3529 Thread *
3530 ValueObject::EvaluationPoint::CalculateThread ()
3531 {
3532     ExecutionContextScope *exe_scope;
3533     SyncWithProcessState(exe_scope);
3534     if (exe_scope)
3535         return exe_scope->CalculateThread();
3536     else
3537         return NULL;
3538 }
3539 
3540 StackFrame *
3541 ValueObject::EvaluationPoint::CalculateStackFrame ()
3542 {
3543     ExecutionContextScope *exe_scope;
3544     SyncWithProcessState(exe_scope);
3545     if (exe_scope)
3546         return exe_scope->CalculateStackFrame();
3547     else
3548         return NULL;
3549 }
3550 
3551 void
3552 ValueObject::EvaluationPoint::CalculateExecutionContext (ExecutionContext &exe_ctx)
3553 {
3554     ExecutionContextScope *exe_scope;
3555     SyncWithProcessState(exe_scope);
3556     if (exe_scope)
3557         return exe_scope->CalculateExecutionContext (exe_ctx);
3558 }
3559 
3560 // This function checks the EvaluationPoint against the current process state.  If the current
3561 // state matches the evaluation point, or the evaluation point is already invalid, then we return
3562 // false, meaning "no change".  If the current state is different, we update our state, and return
3563 // true meaning "yes, change".  If we did see a change, we also set m_needs_update to true, so
3564 // future calls to NeedsUpdate will return true.
3565 // exe_scope will be set to the current execution context scope.
3566 
3567 bool
3568 ValueObject::EvaluationPoint::SyncWithProcessState(ExecutionContextScope *&exe_scope)
3569 {
3570 
3571     // Start with the target, if it is NULL, then we're obviously not going to get any further:
3572     exe_scope = m_target_sp.get();
3573 
3574     if (exe_scope == NULL)
3575         return false;
3576 
3577     // If we don't have a process nothing can change.
3578     if (!m_process_sp)
3579         return false;
3580 
3581     exe_scope = m_process_sp.get();
3582 
3583     // If our stop id is the current stop ID, nothing has changed:
3584     ProcessModID current_mod_id = m_process_sp->GetModID();
3585 
3586     // If the current stop id is 0, either we haven't run yet, or the process state has been cleared.
3587     // In either case, we aren't going to be able to sync with the process state.
3588     if (current_mod_id.GetStopID() == 0)
3589         return false;
3590 
3591     bool changed;
3592 
3593     if (m_mod_id.IsValid())
3594     {
3595         if (m_mod_id == current_mod_id)
3596         {
3597             // Everything is already up to date in this object, no need to
3598             // update the execution context scope.
3599             changed = false;
3600         }
3601         else
3602         {
3603             m_mod_id = current_mod_id;
3604             m_needs_update = true;
3605             changed = true;
3606         }
3607     }
3608 
3609     // Now re-look up the thread and frame in case the underlying objects have gone away & been recreated.
3610     // That way we'll be sure to return a valid exe_scope.
3611     // If we used to have a thread or a frame but can't find it anymore, then mark ourselves as invalid.
3612 
3613     if (m_thread_id != LLDB_INVALID_THREAD_ID)
3614     {
3615         Thread *our_thread = m_process_sp->GetThreadList().FindThreadByIndexID (m_thread_id).get();
3616         if (our_thread == NULL)
3617         {
3618             SetInvalid();
3619         }
3620         else
3621         {
3622             exe_scope = our_thread;
3623 
3624             if (m_stack_id.IsValid())
3625             {
3626                 StackFrame *our_frame = our_thread->GetFrameWithStackID (m_stack_id).get();
3627                 if (our_frame == NULL)
3628                     SetInvalid();
3629                 else
3630                     exe_scope = our_frame;
3631             }
3632         }
3633     }
3634     return changed;
3635 }
3636 
3637 void
3638 ValueObject::EvaluationPoint::SetUpdated ()
3639 {
3640     if (m_process_sp)
3641         m_mod_id = m_process_sp->GetModID();
3642     m_first_update = false;
3643     m_needs_update = false;
3644 }
3645 
3646 
3647 bool
3648 ValueObject::EvaluationPoint::SetContext (ExecutionContextScope *exe_scope)
3649 {
3650     if (!IsValid())
3651         return false;
3652 
3653     bool needs_update = false;
3654 
3655     // The target has to be non-null, and the
3656     Target *target = exe_scope->CalculateTarget();
3657     if (target != NULL)
3658     {
3659         Target *old_target = m_target_sp.get();
3660         assert (target == old_target);
3661         Process *process = exe_scope->CalculateProcess();
3662         if (process != NULL)
3663         {
3664             // FOR NOW - assume you can't update variable objects across process boundaries.
3665             Process *old_process = m_process_sp.get();
3666             assert (process == old_process);
3667             ProcessModID current_mod_id = process->GetModID();
3668             if (m_mod_id != current_mod_id)
3669             {
3670                 needs_update = true;
3671                 m_mod_id = current_mod_id;
3672             }
3673             // See if we're switching the thread or stack context.  If no thread is given, this is
3674             // being evaluated in a global context.
3675             Thread *thread = exe_scope->CalculateThread();
3676             if (thread != NULL)
3677             {
3678                 user_id_t new_thread_index = thread->GetIndexID();
3679                 if (new_thread_index != m_thread_id)
3680                 {
3681                     needs_update = true;
3682                     m_thread_id = new_thread_index;
3683                     m_stack_id.Clear();
3684                 }
3685 
3686                 StackFrame *new_frame = exe_scope->CalculateStackFrame();
3687                 if (new_frame != NULL)
3688                 {
3689                     if (new_frame->GetStackID() != m_stack_id)
3690                     {
3691                         needs_update = true;
3692                         m_stack_id = new_frame->GetStackID();
3693                     }
3694                 }
3695                 else
3696                 {
3697                     m_stack_id.Clear();
3698                     needs_update = true;
3699                 }
3700             }
3701             else
3702             {
3703                 // If this had been given a thread, and now there is none, we should update.
3704                 // Otherwise we don't have to do anything.
3705                 if (m_thread_id != LLDB_INVALID_UID)
3706                 {
3707                     m_thread_id = LLDB_INVALID_UID;
3708                     m_stack_id.Clear();
3709                     needs_update = true;
3710                 }
3711             }
3712         }
3713         else
3714         {
3715             // If there is no process, then we don't need to update anything.
3716             // But if we're switching from having a process to not, we should try to update.
3717             if (m_process_sp.get() != NULL)
3718             {
3719                 needs_update = true;
3720                 m_process_sp.reset();
3721                 m_thread_id = LLDB_INVALID_UID;
3722                 m_stack_id.Clear();
3723             }
3724         }
3725     }
3726     else
3727     {
3728         // If there's no target, nothing can change so we don't need to update anything.
3729         // But if we're switching from having a target to not, we should try to update.
3730         if (m_target_sp.get() != NULL)
3731         {
3732             needs_update = true;
3733             m_target_sp.reset();
3734             m_process_sp.reset();
3735             m_thread_id = LLDB_INVALID_UID;
3736             m_stack_id.Clear();
3737         }
3738     }
3739     if (!m_needs_update)
3740         m_needs_update = needs_update;
3741 
3742     return needs_update;
3743 }
3744 
3745 void
3746 ValueObject::ClearUserVisibleData()
3747 {
3748     m_location_str.clear();
3749     m_value_str.clear();
3750     m_summary_str.clear();
3751     m_object_desc_str.clear();
3752     m_is_getting_summary = false;
3753 }
3754 
3755 SymbolContextScope *
3756 ValueObject::GetSymbolContextScope()
3757 {
3758     if (m_parent)
3759     {
3760         if (!m_parent->IsPointerOrReferenceType())
3761             return m_parent->GetSymbolContextScope();
3762     }
3763     return NULL;
3764 }
3765