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                             lldb::Format my_format = GetFormat();
1084                             if (m_format == lldb::eFormatDefault)
1085                             {
1086                                 if (m_last_value_format)
1087                                     my_format = m_last_value_format->GetFormat();
1088                                 else
1089                                     my_format = reg_info->format;
1090                             }
1091 
1092                             StreamString reg_sstr;
1093                             m_data.Dump(&reg_sstr, 0, my_format, reg_info->byte_size, 1, UINT32_MAX, LLDB_INVALID_ADDRESS, 0, 0, GetExecutionContextScope());
1094                             m_value_str.swap(reg_sstr.GetString());
1095                         }
1096                     }
1097                     break;
1098 
1099                 default:
1100                     break;
1101                 }
1102             }
1103 
1104             if (!m_value_did_change && m_old_value_valid)
1105             {
1106                 // The value was gotten successfully, so we consider the
1107                 // value as changed if the value string differs
1108                 SetValueDidChange (m_old_value_str != m_value_str);
1109             }
1110         }
1111     }
1112     if (m_value_str.empty())
1113         return NULL;
1114     return m_value_str.c_str();
1115 }
1116 
1117 // if > 8bytes, 0 is returned. this method should mostly be used
1118 // to read address values out of pointers
1119 uint64_t
1120 ValueObject::GetValueAsUnsigned (uint64_t fail_value)
1121 {
1122     // If our byte size is zero this is an aggregate type that has children
1123     if (ClangASTContext::IsAggregateType (GetClangType()) == false)
1124     {
1125         Scalar scalar;
1126         if (ResolveValue (scalar))
1127             return scalar.GetRawBits64(fail_value);
1128     }
1129     return fail_value;
1130 }
1131 
1132 bool
1133 ValueObject::GetPrintableRepresentation(Stream& s,
1134                                         ValueObjectRepresentationStyle val_obj_display,
1135                                         Format custom_format)
1136 {
1137 
1138     if (custom_format != eFormatInvalid)
1139         SetFormat(custom_format);
1140 
1141     const char * return_value;
1142     std::string alloc_mem;
1143 
1144     switch(val_obj_display)
1145     {
1146         case eDisplayValue:
1147             return_value = GetValueAsCString();
1148             break;
1149 
1150         case eDisplaySummary:
1151             return_value = GetSummaryAsCString();
1152             break;
1153 
1154         case eDisplayLanguageSpecific:
1155             return_value = GetObjectDescription();
1156             break;
1157 
1158         case eDisplayLocation:
1159             return_value = GetLocationAsCString();
1160             break;
1161 
1162         case eDisplayChildrenCount:
1163             {
1164                 alloc_mem.resize(512);
1165                 return_value = &alloc_mem[0];
1166                 int count = GetNumChildren();
1167                 snprintf((char*)return_value, 512, "%d", count);
1168             }
1169             break;
1170 
1171         case eDisplayType:
1172             return_value = GetTypeName().AsCString();
1173             break;
1174 
1175         default:
1176             break;
1177     }
1178 
1179     if (!return_value)
1180     {
1181         if (val_obj_display == eDisplayValue)
1182             return_value = GetSummaryAsCString();
1183         else if (val_obj_display == eDisplaySummary)
1184         {
1185             if (ClangASTContext::IsAggregateType (GetClangType()) == true)
1186             {
1187                 // this thing has no value, and it seems to have no summary
1188                 // some combination of unitialized data and other factors can also
1189                 // raise this condition, so let's print a nice generic description
1190                 {
1191                     alloc_mem.resize(684);
1192                     return_value = &alloc_mem[0];
1193                     snprintf((char*)return_value, 684, "%s @ %s", GetTypeName().AsCString(), GetLocationAsCString());
1194                 }
1195             }
1196             else
1197                 return_value = GetValueAsCString();
1198         }
1199     }
1200 
1201     if (return_value)
1202         s.PutCString(return_value);
1203     else
1204     {
1205         if (m_error.Fail())
1206             s.Printf("<%s>", m_error.AsCString());
1207         else if (val_obj_display == eDisplaySummary)
1208             s.PutCString("<no summary available>");
1209         else if (val_obj_display == eDisplayValue)
1210             s.PutCString("<no value available>");
1211         else if (val_obj_display == eDisplayLanguageSpecific)
1212             s.PutCString("<not a valid Objective-C object>"); // edit this if we have other runtimes that support a description
1213         else
1214             s.PutCString("<no printable representation>");
1215     }
1216 
1217     // we should only return false here if we could not do *anything*
1218     // even if we have an error message as output, that's a success
1219     // from our callers' perspective, so return true
1220     return true;
1221 
1222 }
1223 
1224 // if any more "special cases" are added to ValueObject::DumpPrintableRepresentation() please keep
1225 // this call up to date by returning true for your new special cases. We will eventually move
1226 // to checking this call result before trying to display special cases
1227 bool
1228 ValueObject::HasSpecialCasesForPrintableRepresentation(ValueObjectRepresentationStyle val_obj_display,
1229                                                        Format custom_format)
1230 {
1231     clang_type_t elem_or_pointee_type;
1232     Flags flags(ClangASTContext::GetTypeInfo(GetClangType(), GetClangAST(), &elem_or_pointee_type));
1233 
1234     if (flags.AnySet(ClangASTContext::eTypeIsArray | ClangASTContext::eTypeIsPointer)
1235         && val_obj_display == ValueObject::eDisplayValue)
1236     {
1237         if (IsCStringContainer(true) &&
1238             (custom_format == eFormatCString ||
1239              custom_format == eFormatCharArray ||
1240              custom_format == eFormatChar ||
1241              custom_format == eFormatVectorOfChar))
1242             return true;
1243 
1244         if (flags.Test(ClangASTContext::eTypeIsArray))
1245         {
1246             if ((custom_format == eFormatBytes) ||
1247                 (custom_format == eFormatBytesWithASCII))
1248                 return true;
1249 
1250             if ((custom_format == eFormatVectorOfChar) ||
1251                 (custom_format == eFormatVectorOfFloat32) ||
1252                 (custom_format == eFormatVectorOfFloat64) ||
1253                 (custom_format == eFormatVectorOfSInt16) ||
1254                 (custom_format == eFormatVectorOfSInt32) ||
1255                 (custom_format == eFormatVectorOfSInt64) ||
1256                 (custom_format == eFormatVectorOfSInt8) ||
1257                 (custom_format == eFormatVectorOfUInt128) ||
1258                 (custom_format == eFormatVectorOfUInt16) ||
1259                 (custom_format == eFormatVectorOfUInt32) ||
1260                 (custom_format == eFormatVectorOfUInt64) ||
1261                 (custom_format == eFormatVectorOfUInt8))
1262                 return true;
1263         }
1264     }
1265     return false;
1266 }
1267 
1268 bool
1269 ValueObject::DumpPrintableRepresentation(Stream& s,
1270                                          ValueObjectRepresentationStyle val_obj_display,
1271                                          Format custom_format,
1272                                          bool only_special)
1273 {
1274 
1275     clang_type_t elem_or_pointee_type;
1276     Flags flags(ClangASTContext::GetTypeInfo(GetClangType(), GetClangAST(), &elem_or_pointee_type));
1277 
1278     if (flags.AnySet(ClangASTContext::eTypeIsArray | ClangASTContext::eTypeIsPointer)
1279          && val_obj_display == ValueObject::eDisplayValue)
1280     {
1281         // when being asked to get a printable display an array or pointer type directly,
1282         // try to "do the right thing"
1283 
1284         if (IsCStringContainer(true) &&
1285             (custom_format == eFormatCString ||
1286              custom_format == eFormatCharArray ||
1287              custom_format == eFormatChar ||
1288              custom_format == eFormatVectorOfChar)) // print char[] & char* directly
1289         {
1290             Error error;
1291             ReadPointedString(s,
1292                               error,
1293                               0,
1294                               (custom_format == eFormatVectorOfChar) ||
1295                               (custom_format == eFormatCharArray));
1296             return !error.Fail();
1297         }
1298 
1299         if (custom_format == eFormatEnum)
1300             return false;
1301 
1302         // this only works for arrays, because I have no way to know when
1303         // the pointed memory ends, and no special \0 end of data marker
1304         if (flags.Test(ClangASTContext::eTypeIsArray))
1305         {
1306             if ((custom_format == eFormatBytes) ||
1307                 (custom_format == eFormatBytesWithASCII))
1308             {
1309                 uint32_t count = GetNumChildren();
1310 
1311                 s << '[';
1312                 for (uint32_t low = 0; low < count; low++)
1313                 {
1314 
1315                     if (low)
1316                         s << ',';
1317 
1318                     ValueObjectSP child = GetChildAtIndex(low,true);
1319                     if (!child.get())
1320                     {
1321                         s << "<invalid child>";
1322                         continue;
1323                     }
1324                     child->DumpPrintableRepresentation(s, ValueObject::eDisplayValue, custom_format);
1325                 }
1326 
1327                 s << ']';
1328 
1329                 return true;
1330             }
1331 
1332             if ((custom_format == eFormatVectorOfChar) ||
1333                 (custom_format == eFormatVectorOfFloat32) ||
1334                 (custom_format == eFormatVectorOfFloat64) ||
1335                 (custom_format == eFormatVectorOfSInt16) ||
1336                 (custom_format == eFormatVectorOfSInt32) ||
1337                 (custom_format == eFormatVectorOfSInt64) ||
1338                 (custom_format == eFormatVectorOfSInt8) ||
1339                 (custom_format == eFormatVectorOfUInt128) ||
1340                 (custom_format == eFormatVectorOfUInt16) ||
1341                 (custom_format == eFormatVectorOfUInt32) ||
1342                 (custom_format == eFormatVectorOfUInt64) ||
1343                 (custom_format == eFormatVectorOfUInt8)) // arrays of bytes, bytes with ASCII or any vector format should be printed directly
1344             {
1345                 uint32_t count = GetNumChildren();
1346 
1347                 Format format = FormatManager::GetSingleItemFormat(custom_format);
1348 
1349                 s << '[';
1350                 for (uint32_t low = 0; low < count; low++)
1351                 {
1352 
1353                     if (low)
1354                         s << ',';
1355 
1356                     ValueObjectSP child = GetChildAtIndex(low,true);
1357                     if (!child.get())
1358                     {
1359                         s << "<invalid child>";
1360                         continue;
1361                     }
1362                     child->DumpPrintableRepresentation(s, ValueObject::eDisplayValue, format);
1363                 }
1364 
1365                 s << ']';
1366 
1367                 return true;
1368             }
1369         }
1370 
1371         if ((custom_format == eFormatBoolean) ||
1372             (custom_format == eFormatBinary) ||
1373             (custom_format == eFormatChar) ||
1374             (custom_format == eFormatCharPrintable) ||
1375             (custom_format == eFormatComplexFloat) ||
1376             (custom_format == eFormatDecimal) ||
1377             (custom_format == eFormatHex) ||
1378             (custom_format == eFormatFloat) ||
1379             (custom_format == eFormatOctal) ||
1380             (custom_format == eFormatOSType) ||
1381             (custom_format == eFormatUnicode16) ||
1382             (custom_format == eFormatUnicode32) ||
1383             (custom_format == eFormatUnsigned) ||
1384             (custom_format == eFormatPointer) ||
1385             (custom_format == eFormatComplexInteger) ||
1386             (custom_format == eFormatComplex) ||
1387             (custom_format == eFormatDefault)) // use the [] operator
1388             return false;
1389     }
1390 
1391     if (only_special)
1392         return false;
1393 
1394     bool var_success = GetPrintableRepresentation(s, val_obj_display, custom_format);
1395     if (custom_format != eFormatInvalid)
1396         SetFormat(eFormatDefault);
1397     return var_success;
1398 }
1399 
1400 addr_t
1401 ValueObject::GetAddressOf (bool scalar_is_load_address, AddressType *address_type)
1402 {
1403     if (!UpdateValueIfNeeded(false))
1404         return LLDB_INVALID_ADDRESS;
1405 
1406     switch (m_value.GetValueType())
1407     {
1408     case Value::eValueTypeScalar:
1409         if (scalar_is_load_address)
1410         {
1411             if(address_type)
1412                 *address_type = eAddressTypeLoad;
1413             return m_value.GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
1414         }
1415         break;
1416 
1417     case Value::eValueTypeLoadAddress:
1418     case Value::eValueTypeFileAddress:
1419     case Value::eValueTypeHostAddress:
1420         {
1421             if(address_type)
1422                 *address_type = m_value.GetValueAddressType ();
1423             return m_value.GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
1424         }
1425         break;
1426     }
1427     if (address_type)
1428         *address_type = eAddressTypeInvalid;
1429     return LLDB_INVALID_ADDRESS;
1430 }
1431 
1432 addr_t
1433 ValueObject::GetPointerValue (AddressType *address_type)
1434 {
1435     addr_t address = LLDB_INVALID_ADDRESS;
1436     if(address_type)
1437         *address_type = eAddressTypeInvalid;
1438 
1439     if (!UpdateValueIfNeeded(false))
1440         return address;
1441 
1442     switch (m_value.GetValueType())
1443     {
1444     case Value::eValueTypeScalar:
1445         address = m_value.GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
1446         break;
1447 
1448     case Value::eValueTypeHostAddress:
1449     case Value::eValueTypeLoadAddress:
1450     case Value::eValueTypeFileAddress:
1451         {
1452             uint32_t data_offset = 0;
1453             address = m_data.GetPointer(&data_offset);
1454         }
1455         break;
1456     }
1457 
1458     if (address_type)
1459         *address_type = GetAddressTypeOfChildren();
1460 
1461     return address;
1462 }
1463 
1464 bool
1465 ValueObject::SetValueFromCString (const char *value_str)
1466 {
1467     // Make sure our value is up to date first so that our location and location
1468     // type is valid.
1469     if (!UpdateValueIfNeeded(false))
1470         return false;
1471 
1472     uint32_t count = 0;
1473     Encoding encoding = ClangASTType::GetEncoding (GetClangType(), count);
1474 
1475     const size_t byte_size = GetByteSize();
1476 
1477     Value::ValueType value_type = m_value.GetValueType();
1478 
1479     if (value_type == Value::eValueTypeScalar)
1480     {
1481         // If the value is already a scalar, then let the scalar change itself:
1482         m_value.GetScalar().SetValueFromCString (value_str, encoding, byte_size);
1483     }
1484     else if (byte_size <= Scalar::GetMaxByteSize())
1485     {
1486         // If the value fits in a scalar, then make a new scalar and again let the
1487         // scalar code do the conversion, then figure out where to put the new value.
1488         Scalar new_scalar;
1489         Error error;
1490         error = new_scalar.SetValueFromCString (value_str, encoding, byte_size);
1491         if (error.Success())
1492         {
1493             switch (value_type)
1494             {
1495                 case Value::eValueTypeLoadAddress:
1496                 {
1497                     // If it is a load address, then the scalar value is the storage location
1498                     // of the data, and we have to shove this value down to that load location.
1499                     ProcessSP process_sp = GetUpdatePoint().GetProcessSP();
1500                     if (process_sp)
1501                     {
1502                         addr_t target_addr = m_value.GetScalar().GetRawBits64(LLDB_INVALID_ADDRESS);
1503                         size_t bytes_written = process_sp->WriteScalarToMemory (target_addr,
1504                                                                             new_scalar,
1505                                                                             byte_size,
1506                                                                             error);
1507                         if (!error.Success() || bytes_written != byte_size)
1508                             return false;
1509                     }
1510                 }
1511                 break;
1512                 case Value::eValueTypeHostAddress:
1513                 {
1514                     // If it is a host address, then we stuff the scalar as a DataBuffer into the Value's data.
1515                     DataExtractor new_data;
1516                     new_data.SetByteOrder (m_data.GetByteOrder());
1517 
1518                     DataBufferSP buffer_sp (new DataBufferHeap(byte_size, 0));
1519                     m_data.SetData(buffer_sp, 0);
1520                     bool success = new_scalar.GetData(new_data);
1521                     if (success)
1522                     {
1523                         new_data.CopyByteOrderedData(0,
1524                                                      byte_size,
1525                                                      const_cast<uint8_t *>(m_data.GetDataStart()),
1526                                                      byte_size,
1527                                                      m_data.GetByteOrder());
1528                     }
1529                     m_value.GetScalar() = (uintptr_t)m_data.GetDataStart();
1530 
1531                 }
1532                 break;
1533                 case Value::eValueTypeFileAddress:
1534                 case Value::eValueTypeScalar:
1535                 break;
1536             }
1537         }
1538         else
1539         {
1540             return false;
1541         }
1542     }
1543     else
1544     {
1545         // We don't support setting things bigger than a scalar at present.
1546         return false;
1547     }
1548 
1549     // If we have reached this point, then we have successfully changed the value.
1550     SetNeedsUpdate();
1551     return true;
1552 }
1553 
1554 LanguageType
1555 ValueObject::GetObjectRuntimeLanguage ()
1556 {
1557     return ClangASTType::GetMinimumLanguage (GetClangAST(),
1558                                              GetClangType());
1559 }
1560 
1561 void
1562 ValueObject::AddSyntheticChild (const ConstString &key, ValueObject *valobj)
1563 {
1564     m_synthetic_children[key] = valobj;
1565 }
1566 
1567 ValueObjectSP
1568 ValueObject::GetSyntheticChild (const ConstString &key) const
1569 {
1570     ValueObjectSP synthetic_child_sp;
1571     std::map<ConstString, ValueObject *>::const_iterator pos = m_synthetic_children.find (key);
1572     if (pos != m_synthetic_children.end())
1573         synthetic_child_sp = pos->second->GetSP();
1574     return synthetic_child_sp;
1575 }
1576 
1577 bool
1578 ValueObject::IsPointerType ()
1579 {
1580     return ClangASTContext::IsPointerType (GetClangType());
1581 }
1582 
1583 bool
1584 ValueObject::IsArrayType ()
1585 {
1586     return ClangASTContext::IsArrayType (GetClangType());
1587 }
1588 
1589 bool
1590 ValueObject::IsScalarType ()
1591 {
1592     return ClangASTContext::IsScalarType (GetClangType());
1593 }
1594 
1595 bool
1596 ValueObject::IsIntegerType (bool &is_signed)
1597 {
1598     return ClangASTContext::IsIntegerType (GetClangType(), is_signed);
1599 }
1600 
1601 bool
1602 ValueObject::IsPointerOrReferenceType ()
1603 {
1604     return ClangASTContext::IsPointerOrReferenceType (GetClangType());
1605 }
1606 
1607 bool
1608 ValueObject::IsPossibleCPlusPlusDynamicType ()
1609 {
1610     return ClangASTContext::IsPossibleCPlusPlusDynamicType (GetClangAST (), GetClangType());
1611 }
1612 
1613 bool
1614 ValueObject::IsPossibleDynamicType ()
1615 {
1616     return ClangASTContext::IsPossibleDynamicType (GetClangAST (), GetClangType());
1617 }
1618 
1619 ValueObjectSP
1620 ValueObject::GetSyntheticArrayMember (int32_t index, bool can_create)
1621 {
1622     if (IsArrayType())
1623         return GetSyntheticArrayMemberFromArray(index, can_create);
1624 
1625     if (IsPointerType())
1626         return GetSyntheticArrayMemberFromPointer(index, can_create);
1627 
1628     return ValueObjectSP();
1629 
1630 }
1631 
1632 ValueObjectSP
1633 ValueObject::GetSyntheticArrayMemberFromPointer (int32_t index, bool can_create)
1634 {
1635     ValueObjectSP synthetic_child_sp;
1636     if (IsPointerType ())
1637     {
1638         char index_str[64];
1639         snprintf(index_str, sizeof(index_str), "[%i]", index);
1640         ConstString index_const_str(index_str);
1641         // Check if we have already created a synthetic array member in this
1642         // valid object. If we have we will re-use it.
1643         synthetic_child_sp = GetSyntheticChild (index_const_str);
1644         if (!synthetic_child_sp)
1645         {
1646             ValueObject *synthetic_child;
1647             // We haven't made a synthetic array member for INDEX yet, so
1648             // lets make one and cache it for any future reference.
1649             synthetic_child = CreateChildAtIndex(0, true, index);
1650 
1651             // Cache the value if we got one back...
1652             if (synthetic_child)
1653             {
1654                 AddSyntheticChild(index_const_str, synthetic_child);
1655                 synthetic_child_sp = synthetic_child->GetSP();
1656                 synthetic_child_sp->SetName(ConstString(index_str));
1657                 synthetic_child_sp->m_is_array_item_for_pointer = true;
1658             }
1659         }
1660     }
1661     return synthetic_child_sp;
1662 }
1663 
1664 // This allows you to create an array member using and index
1665 // that doesn't not fall in the normal bounds of the array.
1666 // Many times structure can be defined as:
1667 // struct Collection
1668 // {
1669 //     uint32_t item_count;
1670 //     Item item_array[0];
1671 // };
1672 // The size of the "item_array" is 1, but many times in practice
1673 // there are more items in "item_array".
1674 
1675 ValueObjectSP
1676 ValueObject::GetSyntheticArrayMemberFromArray (int32_t index, bool can_create)
1677 {
1678     ValueObjectSP synthetic_child_sp;
1679     if (IsArrayType ())
1680     {
1681         char index_str[64];
1682         snprintf(index_str, sizeof(index_str), "[%i]", index);
1683         ConstString index_const_str(index_str);
1684         // Check if we have already created a synthetic array member in this
1685         // valid object. If we have we will re-use it.
1686         synthetic_child_sp = GetSyntheticChild (index_const_str);
1687         if (!synthetic_child_sp)
1688         {
1689             ValueObject *synthetic_child;
1690             // We haven't made a synthetic array member for INDEX yet, so
1691             // lets make one and cache it for any future reference.
1692             synthetic_child = CreateChildAtIndex(0, true, index);
1693 
1694             // Cache the value if we got one back...
1695             if (synthetic_child)
1696             {
1697                 AddSyntheticChild(index_const_str, synthetic_child);
1698                 synthetic_child_sp = synthetic_child->GetSP();
1699                 synthetic_child_sp->SetName(ConstString(index_str));
1700                 synthetic_child_sp->m_is_array_item_for_pointer = true;
1701             }
1702         }
1703     }
1704     return synthetic_child_sp;
1705 }
1706 
1707 ValueObjectSP
1708 ValueObject::GetSyntheticBitFieldChild (uint32_t from, uint32_t to, bool can_create)
1709 {
1710     ValueObjectSP synthetic_child_sp;
1711     if (IsScalarType ())
1712     {
1713         char index_str[64];
1714         snprintf(index_str, sizeof(index_str), "[%i-%i]", from, to);
1715         ConstString index_const_str(index_str);
1716         // Check if we have already created a synthetic array member in this
1717         // valid object. If we have we will re-use it.
1718         synthetic_child_sp = GetSyntheticChild (index_const_str);
1719         if (!synthetic_child_sp)
1720         {
1721             ValueObjectChild *synthetic_child;
1722             // We haven't made a synthetic array member for INDEX yet, so
1723             // lets make one and cache it for any future reference.
1724             synthetic_child = new ValueObjectChild(*this,
1725                                                       GetClangAST(),
1726                                                       GetClangType(),
1727                                                       index_const_str,
1728                                                       GetByteSize(),
1729                                                       0,
1730                                                       to-from+1,
1731                                                       from,
1732                                                       false,
1733                                                       false,
1734                                                       eAddressTypeInvalid);
1735 
1736             // Cache the value if we got one back...
1737             if (synthetic_child)
1738             {
1739                 AddSyntheticChild(index_const_str, synthetic_child);
1740                 synthetic_child_sp = synthetic_child->GetSP();
1741                 synthetic_child_sp->SetName(ConstString(index_str));
1742                 synthetic_child_sp->m_is_bitfield_for_scalar = true;
1743             }
1744         }
1745     }
1746     return synthetic_child_sp;
1747 }
1748 
1749 ValueObjectSP
1750 ValueObject::GetSyntheticArrayRangeChild (uint32_t from, uint32_t to, bool can_create)
1751 {
1752     ValueObjectSP synthetic_child_sp;
1753     if (IsArrayType () || IsPointerType ())
1754     {
1755         char index_str[64];
1756         snprintf(index_str, sizeof(index_str), "[%i-%i]", from, to);
1757         ConstString index_const_str(index_str);
1758         // Check if we have already created a synthetic array member in this
1759         // valid object. If we have we will re-use it.
1760         synthetic_child_sp = GetSyntheticChild (index_const_str);
1761         if (!synthetic_child_sp)
1762         {
1763             ValueObjectSynthetic *synthetic_child;
1764 
1765             // We haven't made a synthetic array member for INDEX yet, so
1766             // lets make one and cache it for any future reference.
1767             SyntheticArrayView *view = new SyntheticArrayView();
1768             view->AddRange(from,to);
1769             SyntheticChildrenSP view_sp(view);
1770             synthetic_child = new ValueObjectSynthetic(*this, view_sp);
1771 
1772             // Cache the value if we got one back...
1773             if (synthetic_child)
1774             {
1775                 AddSyntheticChild(index_const_str, synthetic_child);
1776                 synthetic_child_sp = synthetic_child->GetSP();
1777                 synthetic_child_sp->SetName(ConstString(index_str));
1778                 synthetic_child_sp->m_is_bitfield_for_scalar = true;
1779             }
1780         }
1781     }
1782     return synthetic_child_sp;
1783 }
1784 
1785 ValueObjectSP
1786 ValueObject::GetSyntheticChildAtOffset(uint32_t offset, const ClangASTType& type, bool can_create)
1787 {
1788 
1789     ValueObjectSP synthetic_child_sp;
1790 
1791     char name_str[64];
1792     snprintf(name_str, sizeof(name_str), "@%i", offset);
1793     ConstString name_const_str(name_str);
1794 
1795     // Check if we have already created a synthetic array member in this
1796     // valid object. If we have we will re-use it.
1797     synthetic_child_sp = GetSyntheticChild (name_const_str);
1798 
1799     if (synthetic_child_sp.get())
1800         return synthetic_child_sp;
1801 
1802     if (!can_create)
1803         return ValueObjectSP();
1804 
1805     ValueObjectChild *synthetic_child = new ValueObjectChild(*this,
1806                                                              type.GetASTContext(),
1807                                                              type.GetOpaqueQualType(),
1808                                                              name_const_str,
1809                                                              type.GetTypeByteSize(),
1810                                                              offset,
1811                                                              0,
1812                                                              0,
1813                                                              false,
1814                                                              false,
1815                                                              eAddressTypeInvalid);
1816     if (synthetic_child)
1817     {
1818         AddSyntheticChild(name_const_str, synthetic_child);
1819         synthetic_child_sp = synthetic_child->GetSP();
1820         synthetic_child_sp->SetName(name_const_str);
1821         synthetic_child_sp->m_is_child_at_offset = true;
1822     }
1823     return synthetic_child_sp;
1824 }
1825 
1826 // your expression path needs to have a leading . or ->
1827 // (unless it somehow "looks like" an array, in which case it has
1828 // a leading [ symbol). while the [ is meaningful and should be shown
1829 // to the user, . and -> are just parser design, but by no means
1830 // added information for the user.. strip them off
1831 static const char*
1832 SkipLeadingExpressionPathSeparators(const char* expression)
1833 {
1834     if (!expression || !expression[0])
1835         return expression;
1836     if (expression[0] == '.')
1837         return expression+1;
1838     if (expression[0] == '-' && expression[1] == '>')
1839         return expression+2;
1840     return expression;
1841 }
1842 
1843 ValueObjectSP
1844 ValueObject::GetSyntheticExpressionPathChild(const char* expression, bool can_create)
1845 {
1846     ValueObjectSP synthetic_child_sp;
1847     ConstString name_const_string(expression);
1848     // Check if we have already created a synthetic array member in this
1849     // valid object. If we have we will re-use it.
1850     synthetic_child_sp = GetSyntheticChild (name_const_string);
1851     if (!synthetic_child_sp)
1852     {
1853         // We haven't made a synthetic array member for expression yet, so
1854         // lets make one and cache it for any future reference.
1855         synthetic_child_sp = GetValueForExpressionPath(expression);
1856 
1857         // Cache the value if we got one back...
1858         if (synthetic_child_sp.get())
1859         {
1860             AddSyntheticChild(name_const_string, synthetic_child_sp.get());
1861             synthetic_child_sp->SetName(ConstString(SkipLeadingExpressionPathSeparators(expression)));
1862             synthetic_child_sp->m_is_expression_path_child = true;
1863         }
1864     }
1865     return synthetic_child_sp;
1866 }
1867 
1868 void
1869 ValueObject::CalculateSyntheticValue (SyntheticValueType use_synthetic)
1870 {
1871     if (use_synthetic == eNoSyntheticFilter)
1872         return;
1873 
1874     UpdateFormatsIfNeeded(m_last_format_mgr_dynamic);
1875 
1876     if (m_last_synthetic_filter.get() == NULL)
1877         return;
1878 
1879     if (m_synthetic_value == NULL)
1880         m_synthetic_value = new ValueObjectSynthetic(*this, m_last_synthetic_filter);
1881 
1882 }
1883 
1884 void
1885 ValueObject::CalculateDynamicValue (DynamicValueType use_dynamic)
1886 {
1887     if (use_dynamic == eNoDynamicValues)
1888         return;
1889 
1890     if (!m_dynamic_value && !IsDynamic())
1891     {
1892         Process *process = m_update_point.GetProcessSP().get();
1893         bool worth_having_dynamic_value = false;
1894 
1895 
1896         // FIXME: Process should have some kind of "map over Runtimes" so we don't have to
1897         // hard code this everywhere.
1898         LanguageType known_type = GetObjectRuntimeLanguage();
1899         if (known_type != eLanguageTypeUnknown && known_type != eLanguageTypeC)
1900         {
1901             LanguageRuntime *runtime = process->GetLanguageRuntime (known_type);
1902             if (runtime)
1903                 worth_having_dynamic_value = runtime->CouldHaveDynamicValue(*this);
1904         }
1905         else
1906         {
1907             LanguageRuntime *cpp_runtime = process->GetLanguageRuntime (eLanguageTypeC_plus_plus);
1908             if (cpp_runtime)
1909                 worth_having_dynamic_value = cpp_runtime->CouldHaveDynamicValue(*this);
1910 
1911             if (!worth_having_dynamic_value)
1912             {
1913                 LanguageRuntime *objc_runtime = process->GetLanguageRuntime (eLanguageTypeObjC);
1914                 if (objc_runtime)
1915                     worth_having_dynamic_value = objc_runtime->CouldHaveDynamicValue(*this);
1916             }
1917         }
1918 
1919         if (worth_having_dynamic_value)
1920             m_dynamic_value = new ValueObjectDynamicValue (*this, use_dynamic);
1921 
1922 //        if (worth_having_dynamic_value)
1923 //            printf ("Adding dynamic value %s (%p) to (%p) - manager %p.\n", m_name.GetCString(), m_dynamic_value, this, m_manager);
1924 
1925     }
1926 }
1927 
1928 ValueObjectSP
1929 ValueObject::GetDynamicValue (DynamicValueType use_dynamic)
1930 {
1931     if (use_dynamic == eNoDynamicValues)
1932         return ValueObjectSP();
1933 
1934     if (!IsDynamic() && m_dynamic_value == NULL)
1935     {
1936         CalculateDynamicValue(use_dynamic);
1937     }
1938     if (m_dynamic_value)
1939         return m_dynamic_value->GetSP();
1940     else
1941         return ValueObjectSP();
1942 }
1943 
1944 ValueObjectSP
1945 ValueObject::GetStaticValue()
1946 {
1947     return GetSP();
1948 }
1949 
1950 // GetDynamicValue() returns a NULL SharedPointer if the object is not dynamic
1951 // or we do not really want a dynamic VO. this method instead returns this object
1952 // itself when making it synthetic has no meaning. this makes it much simpler
1953 // to replace the SyntheticValue for the ValueObject
1954 ValueObjectSP
1955 ValueObject::GetSyntheticValue (SyntheticValueType use_synthetic)
1956 {
1957     if (use_synthetic == eNoSyntheticFilter)
1958         return GetSP();
1959 
1960     UpdateFormatsIfNeeded(m_last_format_mgr_dynamic);
1961 
1962     if (m_last_synthetic_filter.get() == NULL)
1963         return GetSP();
1964 
1965     CalculateSyntheticValue(use_synthetic);
1966 
1967     if (m_synthetic_value)
1968         return m_synthetic_value->GetSP();
1969     else
1970         return GetSP();
1971 }
1972 
1973 bool
1974 ValueObject::HasSyntheticValue()
1975 {
1976     UpdateFormatsIfNeeded(m_last_format_mgr_dynamic);
1977 
1978     if (m_last_synthetic_filter.get() == NULL)
1979         return false;
1980 
1981     CalculateSyntheticValue(eUseSyntheticFilter);
1982 
1983     if (m_synthetic_value)
1984         return true;
1985     else
1986         return false;
1987 }
1988 
1989 bool
1990 ValueObject::GetBaseClassPath (Stream &s)
1991 {
1992     if (IsBaseClass())
1993     {
1994         bool parent_had_base_class = GetParent() && GetParent()->GetBaseClassPath (s);
1995         clang_type_t clang_type = GetClangType();
1996         std::string cxx_class_name;
1997         bool this_had_base_class = ClangASTContext::GetCXXClassName (clang_type, cxx_class_name);
1998         if (this_had_base_class)
1999         {
2000             if (parent_had_base_class)
2001                 s.PutCString("::");
2002             s.PutCString(cxx_class_name.c_str());
2003         }
2004         return parent_had_base_class || this_had_base_class;
2005     }
2006     return false;
2007 }
2008 
2009 
2010 ValueObject *
2011 ValueObject::GetNonBaseClassParent()
2012 {
2013     if (GetParent())
2014     {
2015         if (GetParent()->IsBaseClass())
2016             return GetParent()->GetNonBaseClassParent();
2017         else
2018             return GetParent();
2019     }
2020     return NULL;
2021 }
2022 
2023 void
2024 ValueObject::GetExpressionPath (Stream &s, bool qualify_cxx_base_classes, GetExpressionPathFormat epformat)
2025 {
2026     const bool is_deref_of_parent = IsDereferenceOfParent ();
2027 
2028     if (is_deref_of_parent && epformat == eDereferencePointers)
2029     {
2030         // this is the original format of GetExpressionPath() producing code like *(a_ptr).memberName, which is entirely
2031         // fine, until you put this into StackFrame::GetValueForVariableExpressionPath() which prefers to see a_ptr->memberName.
2032         // the eHonorPointers mode is meant to produce strings in this latter format
2033         s.PutCString("*(");
2034     }
2035 
2036     ValueObject* parent = GetParent();
2037 
2038     if (parent)
2039         parent->GetExpressionPath (s, qualify_cxx_base_classes, epformat);
2040 
2041     // if we are a deref_of_parent just because we are synthetic array
2042     // members made up to allow ptr[%d] syntax to work in variable
2043     // printing, then add our name ([%d]) to the expression path
2044     if (m_is_array_item_for_pointer && epformat == eHonorPointers)
2045         s.PutCString(m_name.AsCString());
2046 
2047     if (!IsBaseClass())
2048     {
2049         if (!is_deref_of_parent)
2050         {
2051             ValueObject *non_base_class_parent = GetNonBaseClassParent();
2052             if (non_base_class_parent)
2053             {
2054                 clang_type_t non_base_class_parent_clang_type = non_base_class_parent->GetClangType();
2055                 if (non_base_class_parent_clang_type)
2056                 {
2057                     const uint32_t non_base_class_parent_type_info = ClangASTContext::GetTypeInfo (non_base_class_parent_clang_type, NULL, NULL);
2058 
2059                     if (parent && parent->IsDereferenceOfParent() && epformat == eHonorPointers)
2060                     {
2061                         s.PutCString("->");
2062                     }
2063                     else
2064                     {
2065                         if (non_base_class_parent_type_info & ClangASTContext::eTypeIsPointer)
2066                         {
2067                             s.PutCString("->");
2068                         }
2069                         else if ((non_base_class_parent_type_info & ClangASTContext::eTypeHasChildren) &&
2070                                  !(non_base_class_parent_type_info & ClangASTContext::eTypeIsArray))
2071                         {
2072                             s.PutChar('.');
2073                         }
2074                     }
2075                 }
2076             }
2077 
2078             const char *name = GetName().GetCString();
2079             if (name)
2080             {
2081                 if (qualify_cxx_base_classes)
2082                 {
2083                     if (GetBaseClassPath (s))
2084                         s.PutCString("::");
2085                 }
2086                 s.PutCString(name);
2087             }
2088         }
2089     }
2090 
2091     if (is_deref_of_parent && epformat == eDereferencePointers)
2092     {
2093         s.PutChar(')');
2094     }
2095 }
2096 
2097 ValueObjectSP
2098 ValueObject::GetValueForExpressionPath(const char* expression,
2099                                        const char** first_unparsed,
2100                                        ExpressionPathScanEndReason* reason_to_stop,
2101                                        ExpressionPathEndResultType* final_value_type,
2102                                        const GetValueForExpressionPathOptions& options,
2103                                        ExpressionPathAftermath* final_task_on_target)
2104 {
2105 
2106     const char* dummy_first_unparsed;
2107     ExpressionPathScanEndReason dummy_reason_to_stop;
2108     ExpressionPathEndResultType dummy_final_value_type;
2109     ExpressionPathAftermath dummy_final_task_on_target = ValueObject::eNothing;
2110 
2111     ValueObjectSP ret_val = GetValueForExpressionPath_Impl(expression,
2112                                                            first_unparsed ? first_unparsed : &dummy_first_unparsed,
2113                                                            reason_to_stop ? reason_to_stop : &dummy_reason_to_stop,
2114                                                            final_value_type ? final_value_type : &dummy_final_value_type,
2115                                                            options,
2116                                                            final_task_on_target ? final_task_on_target : &dummy_final_task_on_target);
2117 
2118     if (!final_task_on_target || *final_task_on_target == ValueObject::eNothing)
2119     {
2120         return ret_val;
2121     }
2122     if (ret_val.get() && *final_value_type == ePlain) // I can only deref and takeaddress of plain objects
2123     {
2124         if (*final_task_on_target == ValueObject::eDereference)
2125         {
2126             Error error;
2127             ValueObjectSP final_value = ret_val->Dereference(error);
2128             if (error.Fail() || !final_value.get())
2129             {
2130                 *reason_to_stop = ValueObject::eDereferencingFailed;
2131                 *final_value_type = ValueObject::eInvalid;
2132                 return ValueObjectSP();
2133             }
2134             else
2135             {
2136                 *final_task_on_target = ValueObject::eNothing;
2137                 return final_value;
2138             }
2139         }
2140         if (*final_task_on_target == ValueObject::eTakeAddress)
2141         {
2142             Error error;
2143             ValueObjectSP final_value = ret_val->AddressOf(error);
2144             if (error.Fail() || !final_value.get())
2145             {
2146                 *reason_to_stop = ValueObject::eTakingAddressFailed;
2147                 *final_value_type = ValueObject::eInvalid;
2148                 return ValueObjectSP();
2149             }
2150             else
2151             {
2152                 *final_task_on_target = ValueObject::eNothing;
2153                 return final_value;
2154             }
2155         }
2156     }
2157     return ret_val; // final_task_on_target will still have its original value, so you know I did not do it
2158 }
2159 
2160 int
2161 ValueObject::GetValuesForExpressionPath(const char* expression,
2162                                         ValueObjectListSP& list,
2163                                         const char** first_unparsed,
2164                                         ExpressionPathScanEndReason* reason_to_stop,
2165                                         ExpressionPathEndResultType* final_value_type,
2166                                         const GetValueForExpressionPathOptions& options,
2167                                         ExpressionPathAftermath* final_task_on_target)
2168 {
2169     const char* dummy_first_unparsed;
2170     ExpressionPathScanEndReason dummy_reason_to_stop;
2171     ExpressionPathEndResultType dummy_final_value_type;
2172     ExpressionPathAftermath dummy_final_task_on_target = ValueObject::eNothing;
2173 
2174     ValueObjectSP ret_val = GetValueForExpressionPath_Impl(expression,
2175                                                            first_unparsed ? first_unparsed : &dummy_first_unparsed,
2176                                                            reason_to_stop ? reason_to_stop : &dummy_reason_to_stop,
2177                                                            final_value_type ? final_value_type : &dummy_final_value_type,
2178                                                            options,
2179                                                            final_task_on_target ? final_task_on_target : &dummy_final_task_on_target);
2180 
2181     if (!ret_val.get()) // if there are errors, I add nothing to the list
2182         return 0;
2183 
2184     if (*reason_to_stop != eArrayRangeOperatorMet)
2185     {
2186         // I need not expand a range, just post-process the final value and return
2187         if (!final_task_on_target || *final_task_on_target == ValueObject::eNothing)
2188         {
2189             list->Append(ret_val);
2190             return 1;
2191         }
2192         if (ret_val.get() && *final_value_type == ePlain) // I can only deref and takeaddress of plain objects
2193         {
2194             if (*final_task_on_target == ValueObject::eDereference)
2195             {
2196                 Error error;
2197                 ValueObjectSP final_value = ret_val->Dereference(error);
2198                 if (error.Fail() || !final_value.get())
2199                 {
2200                     *reason_to_stop = ValueObject::eDereferencingFailed;
2201                     *final_value_type = ValueObject::eInvalid;
2202                     return 0;
2203                 }
2204                 else
2205                 {
2206                     *final_task_on_target = ValueObject::eNothing;
2207                     list->Append(final_value);
2208                     return 1;
2209                 }
2210             }
2211             if (*final_task_on_target == ValueObject::eTakeAddress)
2212             {
2213                 Error error;
2214                 ValueObjectSP final_value = ret_val->AddressOf(error);
2215                 if (error.Fail() || !final_value.get())
2216                 {
2217                     *reason_to_stop = ValueObject::eTakingAddressFailed;
2218                     *final_value_type = ValueObject::eInvalid;
2219                     return 0;
2220                 }
2221                 else
2222                 {
2223                     *final_task_on_target = ValueObject::eNothing;
2224                     list->Append(final_value);
2225                     return 1;
2226                 }
2227             }
2228         }
2229     }
2230     else
2231     {
2232         return ExpandArraySliceExpression(first_unparsed ? *first_unparsed : dummy_first_unparsed,
2233                                           first_unparsed ? first_unparsed : &dummy_first_unparsed,
2234                                           ret_val,
2235                                           list,
2236                                           reason_to_stop ? reason_to_stop : &dummy_reason_to_stop,
2237                                           final_value_type ? final_value_type : &dummy_final_value_type,
2238                                           options,
2239                                           final_task_on_target ? final_task_on_target : &dummy_final_task_on_target);
2240     }
2241     // in any non-covered case, just do the obviously right thing
2242     list->Append(ret_val);
2243     return 1;
2244 }
2245 
2246 ValueObjectSP
2247 ValueObject::GetValueForExpressionPath_Impl(const char* expression_cstr,
2248                                             const char** first_unparsed,
2249                                             ExpressionPathScanEndReason* reason_to_stop,
2250                                             ExpressionPathEndResultType* final_result,
2251                                             const GetValueForExpressionPathOptions& options,
2252                                             ExpressionPathAftermath* what_next)
2253 {
2254     ValueObjectSP root = GetSP();
2255 
2256     if (!root.get())
2257         return ValueObjectSP();
2258 
2259     *first_unparsed = expression_cstr;
2260 
2261     while (true)
2262     {
2263 
2264         const char* expression_cstr = *first_unparsed; // hide the top level expression_cstr
2265 
2266         clang_type_t root_clang_type = root->GetClangType();
2267         clang_type_t pointee_clang_type;
2268         Flags root_clang_type_info,pointee_clang_type_info;
2269 
2270         root_clang_type_info = Flags(ClangASTContext::GetTypeInfo(root_clang_type, GetClangAST(), &pointee_clang_type));
2271         if (pointee_clang_type)
2272             pointee_clang_type_info = Flags(ClangASTContext::GetTypeInfo(pointee_clang_type, GetClangAST(), NULL));
2273 
2274         if (!expression_cstr || *expression_cstr == '\0')
2275         {
2276             *reason_to_stop = ValueObject::eEndOfString;
2277             return root;
2278         }
2279 
2280         switch (*expression_cstr)
2281         {
2282             case '-':
2283             {
2284                 if (options.m_check_dot_vs_arrow_syntax &&
2285                     root_clang_type_info.Test(ClangASTContext::eTypeIsPointer) ) // if you are trying to use -> on a non-pointer and I must catch the error
2286                 {
2287                     *first_unparsed = expression_cstr;
2288                     *reason_to_stop = ValueObject::eArrowInsteadOfDot;
2289                     *final_result = ValueObject::eInvalid;
2290                     return ValueObjectSP();
2291                 }
2292                 if (root_clang_type_info.Test(ClangASTContext::eTypeIsObjC) &&  // if yo are trying to extract an ObjC IVar when this is forbidden
2293                     root_clang_type_info.Test(ClangASTContext::eTypeIsPointer) &&
2294                     options.m_no_fragile_ivar)
2295                 {
2296                     *first_unparsed = expression_cstr;
2297                     *reason_to_stop = ValueObject::eFragileIVarNotAllowed;
2298                     *final_result = ValueObject::eInvalid;
2299                     return ValueObjectSP();
2300                 }
2301                 if (expression_cstr[1] != '>')
2302                 {
2303                     *first_unparsed = expression_cstr;
2304                     *reason_to_stop = ValueObject::eUnexpectedSymbol;
2305                     *final_result = ValueObject::eInvalid;
2306                     return ValueObjectSP();
2307                 }
2308                 expression_cstr++; // skip the -
2309             }
2310             case '.': // or fallthrough from ->
2311             {
2312                 if (options.m_check_dot_vs_arrow_syntax && *expression_cstr == '.' &&
2313                     root_clang_type_info.Test(ClangASTContext::eTypeIsPointer)) // if you are trying to use . on a pointer and I must catch the error
2314                 {
2315                     *first_unparsed = expression_cstr;
2316                     *reason_to_stop = ValueObject::eDotInsteadOfArrow;
2317                     *final_result = ValueObject::eInvalid;
2318                     return ValueObjectSP();
2319                 }
2320                 expression_cstr++; // skip .
2321                 const char *next_separator = strpbrk(expression_cstr+1,"-.[");
2322                 ConstString child_name;
2323                 if (!next_separator) // if no other separator just expand this last layer
2324                 {
2325                     child_name.SetCString (expression_cstr);
2326                     ValueObjectSP child_valobj_sp = root->GetChildMemberWithName(child_name, true);
2327 
2328                     if (child_valobj_sp.get()) // we know we are done, so just return
2329                     {
2330                         *first_unparsed = '\0';
2331                         *reason_to_stop = ValueObject::eEndOfString;
2332                         *final_result = ValueObject::ePlain;
2333                         return child_valobj_sp;
2334                     }
2335                     else if (options.m_no_synthetic_children == false) // let's try with synthetic children
2336                     {
2337                         child_valobj_sp = root->GetSyntheticValue(eNoSyntheticFilter)->GetChildMemberWithName(child_name, true);
2338                     }
2339 
2340                     // if we are here and options.m_no_synthetic_children is true, child_valobj_sp is going to be a NULL SP,
2341                     // so we hit the "else" branch, and return an error
2342                     if(child_valobj_sp.get()) // if it worked, just return
2343                     {
2344                         *first_unparsed = '\0';
2345                         *reason_to_stop = ValueObject::eEndOfString;
2346                         *final_result = ValueObject::ePlain;
2347                         return child_valobj_sp;
2348                     }
2349                     else
2350                     {
2351                         *first_unparsed = expression_cstr;
2352                         *reason_to_stop = ValueObject::eNoSuchChild;
2353                         *final_result = ValueObject::eInvalid;
2354                         return ValueObjectSP();
2355                     }
2356                 }
2357                 else // other layers do expand
2358                 {
2359                     child_name.SetCStringWithLength(expression_cstr, next_separator - expression_cstr);
2360                     ValueObjectSP child_valobj_sp = root->GetChildMemberWithName(child_name, true);
2361                     if (child_valobj_sp.get()) // store the new root and move on
2362                     {
2363                         root = child_valobj_sp;
2364                         *first_unparsed = next_separator;
2365                         *final_result = ValueObject::ePlain;
2366                         continue;
2367                     }
2368                     else if (options.m_no_synthetic_children == false) // let's try with synthetic children
2369                     {
2370                         child_valobj_sp = root->GetSyntheticValue(eUseSyntheticFilter)->GetChildMemberWithName(child_name, true);
2371                     }
2372 
2373                     // if we are here and options.m_no_synthetic_children is true, child_valobj_sp is going to be a NULL SP,
2374                     // so we hit the "else" branch, and return an error
2375                     if(child_valobj_sp.get()) // if it worked, move on
2376                     {
2377                         root = child_valobj_sp;
2378                         *first_unparsed = next_separator;
2379                         *final_result = ValueObject::ePlain;
2380                         continue;
2381                     }
2382                     else
2383                     {
2384                         *first_unparsed = expression_cstr;
2385                         *reason_to_stop = ValueObject::eNoSuchChild;
2386                         *final_result = ValueObject::eInvalid;
2387                         return ValueObjectSP();
2388                     }
2389                 }
2390                 break;
2391             }
2392             case '[':
2393             {
2394                 if (!root_clang_type_info.Test(ClangASTContext::eTypeIsArray) && !root_clang_type_info.Test(ClangASTContext::eTypeIsPointer)) // if this is not a T[] nor a T*
2395                 {
2396                     if (!root_clang_type_info.Test(ClangASTContext::eTypeIsScalar)) // if this is not even a scalar...
2397                     {
2398                         if (options.m_no_synthetic_children) // ...only chance left is synthetic
2399                         {
2400                             *first_unparsed = expression_cstr;
2401                             *reason_to_stop = ValueObject::eRangeOperatorInvalid;
2402                             *final_result = ValueObject::eInvalid;
2403                             return ValueObjectSP();
2404                         }
2405                     }
2406                     else if (!options.m_allow_bitfields_syntax) // if this is a scalar, check that we can expand bitfields
2407                     {
2408                         *first_unparsed = expression_cstr;
2409                         *reason_to_stop = ValueObject::eRangeOperatorNotAllowed;
2410                         *final_result = ValueObject::eInvalid;
2411                         return ValueObjectSP();
2412                     }
2413                 }
2414                 if (*(expression_cstr+1) == ']') // if this is an unbounded range it only works for arrays
2415                 {
2416                     if (!root_clang_type_info.Test(ClangASTContext::eTypeIsArray))
2417                     {
2418                         *first_unparsed = expression_cstr;
2419                         *reason_to_stop = ValueObject::eEmptyRangeNotAllowed;
2420                         *final_result = ValueObject::eInvalid;
2421                         return ValueObjectSP();
2422                     }
2423                     else // even if something follows, we cannot expand unbounded ranges, just let the caller do it
2424                     {
2425                         *first_unparsed = expression_cstr+2;
2426                         *reason_to_stop = ValueObject::eArrayRangeOperatorMet;
2427                         *final_result = ValueObject::eUnboundedRange;
2428                         return root;
2429                     }
2430                 }
2431                 const char *separator_position = ::strchr(expression_cstr+1,'-');
2432                 const char *close_bracket_position = ::strchr(expression_cstr+1,']');
2433                 if (!close_bracket_position) // if there is no ], this is a syntax error
2434                 {
2435                     *first_unparsed = expression_cstr;
2436                     *reason_to_stop = ValueObject::eUnexpectedSymbol;
2437                     *final_result = ValueObject::eInvalid;
2438                     return ValueObjectSP();
2439                 }
2440                 if (!separator_position || separator_position > close_bracket_position) // if no separator, this is either [] or [N]
2441                 {
2442                     char *end = NULL;
2443                     unsigned long index = ::strtoul (expression_cstr+1, &end, 0);
2444                     if (!end || end != close_bracket_position) // if something weird is in our way return an error
2445                     {
2446                         *first_unparsed = expression_cstr;
2447                         *reason_to_stop = ValueObject::eUnexpectedSymbol;
2448                         *final_result = ValueObject::eInvalid;
2449                         return ValueObjectSP();
2450                     }
2451                     if (end - expression_cstr == 1) // if this is [], only return a valid value for arrays
2452                     {
2453                         if (root_clang_type_info.Test(ClangASTContext::eTypeIsArray))
2454                         {
2455                             *first_unparsed = expression_cstr+2;
2456                             *reason_to_stop = ValueObject::eArrayRangeOperatorMet;
2457                             *final_result = ValueObject::eUnboundedRange;
2458                             return root;
2459                         }
2460                         else
2461                         {
2462                             *first_unparsed = expression_cstr;
2463                             *reason_to_stop = ValueObject::eEmptyRangeNotAllowed;
2464                             *final_result = ValueObject::eInvalid;
2465                             return ValueObjectSP();
2466                         }
2467                     }
2468                     // from here on we do have a valid index
2469                     if (root_clang_type_info.Test(ClangASTContext::eTypeIsArray))
2470                     {
2471                         ValueObjectSP child_valobj_sp = root->GetChildAtIndex(index, true);
2472                         if (!child_valobj_sp)
2473                             child_valobj_sp = root->GetSyntheticArrayMemberFromArray(index, true);
2474                         if (!child_valobj_sp)
2475                             if (root->HasSyntheticValue() && root->GetSyntheticValue(eUseSyntheticFilter)->GetNumChildren() > index)
2476                                 child_valobj_sp = root->GetSyntheticValue(eUseSyntheticFilter)->GetChildAtIndex(index, true);
2477                         if (child_valobj_sp)
2478                         {
2479                             root = child_valobj_sp;
2480                             *first_unparsed = end+1; // skip ]
2481                             *final_result = ValueObject::ePlain;
2482                             continue;
2483                         }
2484                         else
2485                         {
2486                             *first_unparsed = expression_cstr;
2487                             *reason_to_stop = ValueObject::eNoSuchChild;
2488                             *final_result = ValueObject::eInvalid;
2489                             return ValueObjectSP();
2490                         }
2491                     }
2492                     else if (root_clang_type_info.Test(ClangASTContext::eTypeIsPointer))
2493                     {
2494                         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
2495                             pointee_clang_type_info.Test(ClangASTContext::eTypeIsScalar))
2496                         {
2497                             Error error;
2498                             root = root->Dereference(error);
2499                             if (error.Fail() || !root.get())
2500                             {
2501                                 *first_unparsed = expression_cstr;
2502                                 *reason_to_stop = ValueObject::eDereferencingFailed;
2503                                 *final_result = ValueObject::eInvalid;
2504                                 return ValueObjectSP();
2505                             }
2506                             else
2507                             {
2508                                 *what_next = eNothing;
2509                                 continue;
2510                             }
2511                         }
2512                         else
2513                         {
2514                             if (ClangASTType::GetMinimumLanguage(root->GetClangAST(),
2515                                                                     root->GetClangType()) == eLanguageTypeObjC
2516                                 &&
2517                                 ClangASTContext::IsPointerType(ClangASTType::GetPointeeType(root->GetClangType())) == false
2518                                 &&
2519                                 root->HasSyntheticValue()
2520                                 &&
2521                                 options.m_no_synthetic_children == false)
2522                             {
2523                                 root = root->GetSyntheticValue(eUseSyntheticFilter)->GetChildAtIndex(index, true);
2524                             }
2525                             else
2526                                 root = root->GetSyntheticArrayMemberFromPointer(index, true);
2527                             if (!root.get())
2528                             {
2529                                 *first_unparsed = expression_cstr;
2530                                 *reason_to_stop = ValueObject::eNoSuchChild;
2531                                 *final_result = ValueObject::eInvalid;
2532                                 return ValueObjectSP();
2533                             }
2534                             else
2535                             {
2536                                 *first_unparsed = end+1; // skip ]
2537                                 *final_result = ValueObject::ePlain;
2538                                 continue;
2539                             }
2540                         }
2541                     }
2542                     else if (ClangASTContext::IsScalarType(root_clang_type))
2543                     {
2544                         root = root->GetSyntheticBitFieldChild(index, index, true);
2545                         if (!root.get())
2546                         {
2547                             *first_unparsed = expression_cstr;
2548                             *reason_to_stop = ValueObject::eNoSuchChild;
2549                             *final_result = ValueObject::eInvalid;
2550                             return ValueObjectSP();
2551                         }
2552                         else // we do not know how to expand members of bitfields, so we just return and let the caller do any further processing
2553                         {
2554                             *first_unparsed = end+1; // skip ]
2555                             *reason_to_stop = ValueObject::eBitfieldRangeOperatorMet;
2556                             *final_result = ValueObject::eBitfield;
2557                             return root;
2558                         }
2559                     }
2560                     else if (root->HasSyntheticValue() && options.m_no_synthetic_children == false)
2561                     {
2562                         root = root->GetSyntheticValue(eUseSyntheticFilter)->GetChildAtIndex(index, true);
2563                         if (!root.get())
2564                         {
2565                             *first_unparsed = expression_cstr;
2566                             *reason_to_stop = ValueObject::eNoSuchChild;
2567                             *final_result = ValueObject::eInvalid;
2568                             return ValueObjectSP();
2569                         }
2570                         else
2571                         {
2572                             *first_unparsed = end+1; // skip ]
2573                             *final_result = ValueObject::ePlain;
2574                             continue;
2575                         }
2576                     }
2577                     else
2578                     {
2579                         *first_unparsed = expression_cstr;
2580                         *reason_to_stop = ValueObject::eNoSuchChild;
2581                         *final_result = ValueObject::eInvalid;
2582                         return ValueObjectSP();
2583                     }
2584                 }
2585                 else // we have a low and a high index
2586                 {
2587                     char *end = NULL;
2588                     unsigned long index_lower = ::strtoul (expression_cstr+1, &end, 0);
2589                     if (!end || end != separator_position) // if something weird is in our way return an error
2590                     {
2591                         *first_unparsed = expression_cstr;
2592                         *reason_to_stop = ValueObject::eUnexpectedSymbol;
2593                         *final_result = ValueObject::eInvalid;
2594                         return ValueObjectSP();
2595                     }
2596                     unsigned long index_higher = ::strtoul (separator_position+1, &end, 0);
2597                     if (!end || end != close_bracket_position) // if something weird is in our way return an error
2598                     {
2599                         *first_unparsed = expression_cstr;
2600                         *reason_to_stop = ValueObject::eUnexpectedSymbol;
2601                         *final_result = ValueObject::eInvalid;
2602                         return ValueObjectSP();
2603                     }
2604                     if (index_lower > index_higher) // swap indices if required
2605                     {
2606                         unsigned long temp = index_lower;
2607                         index_lower = index_higher;
2608                         index_higher = temp;
2609                     }
2610                     if (root_clang_type_info.Test(ClangASTContext::eTypeIsScalar)) // expansion only works for scalars
2611                     {
2612                         root = root->GetSyntheticBitFieldChild(index_lower, index_higher, true);
2613                         if (!root.get())
2614                         {
2615                             *first_unparsed = expression_cstr;
2616                             *reason_to_stop = ValueObject::eNoSuchChild;
2617                             *final_result = ValueObject::eInvalid;
2618                             return ValueObjectSP();
2619                         }
2620                         else
2621                         {
2622                             *first_unparsed = end+1; // skip ]
2623                             *reason_to_stop = ValueObject::eBitfieldRangeOperatorMet;
2624                             *final_result = ValueObject::eBitfield;
2625                             return root;
2626                         }
2627                     }
2628                     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
2629                              *what_next == ValueObject::eDereference &&
2630                              pointee_clang_type_info.Test(ClangASTContext::eTypeIsScalar))
2631                     {
2632                         Error error;
2633                         root = root->Dereference(error);
2634                         if (error.Fail() || !root.get())
2635                         {
2636                             *first_unparsed = expression_cstr;
2637                             *reason_to_stop = ValueObject::eDereferencingFailed;
2638                             *final_result = ValueObject::eInvalid;
2639                             return ValueObjectSP();
2640                         }
2641                         else
2642                         {
2643                             *what_next = ValueObject::eNothing;
2644                             continue;
2645                         }
2646                     }
2647                     else
2648                     {
2649                         *first_unparsed = expression_cstr;
2650                         *reason_to_stop = ValueObject::eArrayRangeOperatorMet;
2651                         *final_result = ValueObject::eBoundedRange;
2652                         return root;
2653                     }
2654                 }
2655                 break;
2656             }
2657             default: // some non-separator is in the way
2658             {
2659                 *first_unparsed = expression_cstr;
2660                 *reason_to_stop = ValueObject::eUnexpectedSymbol;
2661                 *final_result = ValueObject::eInvalid;
2662                 return ValueObjectSP();
2663                 break;
2664             }
2665         }
2666     }
2667 }
2668 
2669 int
2670 ValueObject::ExpandArraySliceExpression(const char* expression_cstr,
2671                                         const char** first_unparsed,
2672                                         ValueObjectSP root,
2673                                         ValueObjectListSP& list,
2674                                         ExpressionPathScanEndReason* reason_to_stop,
2675                                         ExpressionPathEndResultType* final_result,
2676                                         const GetValueForExpressionPathOptions& options,
2677                                         ExpressionPathAftermath* what_next)
2678 {
2679     if (!root.get())
2680         return 0;
2681 
2682     *first_unparsed = expression_cstr;
2683 
2684     while (true)
2685     {
2686 
2687         const char* expression_cstr = *first_unparsed; // hide the top level expression_cstr
2688 
2689         clang_type_t root_clang_type = root->GetClangType();
2690         clang_type_t pointee_clang_type;
2691         Flags root_clang_type_info,pointee_clang_type_info;
2692 
2693         root_clang_type_info = Flags(ClangASTContext::GetTypeInfo(root_clang_type, GetClangAST(), &pointee_clang_type));
2694         if (pointee_clang_type)
2695             pointee_clang_type_info = Flags(ClangASTContext::GetTypeInfo(pointee_clang_type, GetClangAST(), NULL));
2696 
2697         if (!expression_cstr || *expression_cstr == '\0')
2698         {
2699             *reason_to_stop = ValueObject::eEndOfString;
2700             list->Append(root);
2701             return 1;
2702         }
2703 
2704         switch (*expression_cstr)
2705         {
2706             case '[':
2707             {
2708                 if (!root_clang_type_info.Test(ClangASTContext::eTypeIsArray) && !root_clang_type_info.Test(ClangASTContext::eTypeIsPointer)) // if this is not a T[] nor a T*
2709                 {
2710                     if (!root_clang_type_info.Test(ClangASTContext::eTypeIsScalar)) // if this is not even a scalar, this syntax is just plain wrong!
2711                     {
2712                         *first_unparsed = expression_cstr;
2713                         *reason_to_stop = ValueObject::eRangeOperatorInvalid;
2714                         *final_result = ValueObject::eInvalid;
2715                         return 0;
2716                     }
2717                     else if (!options.m_allow_bitfields_syntax) // if this is a scalar, check that we can expand bitfields
2718                     {
2719                         *first_unparsed = expression_cstr;
2720                         *reason_to_stop = ValueObject::eRangeOperatorNotAllowed;
2721                         *final_result = ValueObject::eInvalid;
2722                         return 0;
2723                     }
2724                 }
2725                 if (*(expression_cstr+1) == ']') // if this is an unbounded range it only works for arrays
2726                 {
2727                     if (!root_clang_type_info.Test(ClangASTContext::eTypeIsArray))
2728                     {
2729                         *first_unparsed = expression_cstr;
2730                         *reason_to_stop = ValueObject::eEmptyRangeNotAllowed;
2731                         *final_result = ValueObject::eInvalid;
2732                         return 0;
2733                     }
2734                     else // expand this into list
2735                     {
2736                         int max_index = root->GetNumChildren() - 1;
2737                         for (int index = 0; index < max_index; index++)
2738                         {
2739                             ValueObjectSP child =
2740                                 root->GetChildAtIndex(index, true);
2741                             list->Append(child);
2742                         }
2743                         *first_unparsed = expression_cstr+2;
2744                         *reason_to_stop = ValueObject::eRangeOperatorExpanded;
2745                         *final_result = ValueObject::eValueObjectList;
2746                         return max_index; // tell me number of items I added to the VOList
2747                     }
2748                 }
2749                 const char *separator_position = ::strchr(expression_cstr+1,'-');
2750                 const char *close_bracket_position = ::strchr(expression_cstr+1,']');
2751                 if (!close_bracket_position) // if there is no ], this is a syntax error
2752                 {
2753                     *first_unparsed = expression_cstr;
2754                     *reason_to_stop = ValueObject::eUnexpectedSymbol;
2755                     *final_result = ValueObject::eInvalid;
2756                     return 0;
2757                 }
2758                 if (!separator_position || separator_position > close_bracket_position) // if no separator, this is either [] or [N]
2759                 {
2760                     char *end = NULL;
2761                     unsigned long index = ::strtoul (expression_cstr+1, &end, 0);
2762                     if (!end || end != close_bracket_position) // if something weird is in our way return an error
2763                     {
2764                         *first_unparsed = expression_cstr;
2765                         *reason_to_stop = ValueObject::eUnexpectedSymbol;
2766                         *final_result = ValueObject::eInvalid;
2767                         return 0;
2768                     }
2769                     if (end - expression_cstr == 1) // if this is [], only return a valid value for arrays
2770                     {
2771                         if (root_clang_type_info.Test(ClangASTContext::eTypeIsArray))
2772                         {
2773                             int max_index = root->GetNumChildren() - 1;
2774                             for (int index = 0; index < max_index; index++)
2775                             {
2776                                 ValueObjectSP child =
2777                                 root->GetChildAtIndex(index, true);
2778                                 list->Append(child);
2779                             }
2780                             *first_unparsed = expression_cstr+2;
2781                             *reason_to_stop = ValueObject::eRangeOperatorExpanded;
2782                             *final_result = ValueObject::eValueObjectList;
2783                             return max_index; // tell me number of items I added to the VOList
2784                         }
2785                         else
2786                         {
2787                             *first_unparsed = expression_cstr;
2788                             *reason_to_stop = ValueObject::eEmptyRangeNotAllowed;
2789                             *final_result = ValueObject::eInvalid;
2790                             return 0;
2791                         }
2792                     }
2793                     // from here on we do have a valid index
2794                     if (root_clang_type_info.Test(ClangASTContext::eTypeIsArray))
2795                     {
2796                         root = root->GetChildAtIndex(index, true);
2797                         if (!root.get())
2798                         {
2799                             *first_unparsed = expression_cstr;
2800                             *reason_to_stop = ValueObject::eNoSuchChild;
2801                             *final_result = ValueObject::eInvalid;
2802                             return 0;
2803                         }
2804                         else
2805                         {
2806                             list->Append(root);
2807                             *first_unparsed = end+1; // skip ]
2808                             *reason_to_stop = ValueObject::eRangeOperatorExpanded;
2809                             *final_result = ValueObject::eValueObjectList;
2810                             return 1;
2811                         }
2812                     }
2813                     else if (root_clang_type_info.Test(ClangASTContext::eTypeIsPointer))
2814                     {
2815                         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
2816                             pointee_clang_type_info.Test(ClangASTContext::eTypeIsScalar))
2817                         {
2818                             Error error;
2819                             root = root->Dereference(error);
2820                             if (error.Fail() || !root.get())
2821                             {
2822                                 *first_unparsed = expression_cstr;
2823                                 *reason_to_stop = ValueObject::eDereferencingFailed;
2824                                 *final_result = ValueObject::eInvalid;
2825                                 return 0;
2826                             }
2827                             else
2828                             {
2829                                 *what_next = eNothing;
2830                                 continue;
2831                             }
2832                         }
2833                         else
2834                         {
2835                             root = root->GetSyntheticArrayMemberFromPointer(index, true);
2836                             if (!root.get())
2837                             {
2838                                 *first_unparsed = expression_cstr;
2839                                 *reason_to_stop = ValueObject::eNoSuchChild;
2840                                 *final_result = ValueObject::eInvalid;
2841                                 return 0;
2842                             }
2843                             else
2844                             {
2845                                 list->Append(root);
2846                                 *first_unparsed = end+1; // skip ]
2847                                 *reason_to_stop = ValueObject::eRangeOperatorExpanded;
2848                                 *final_result = ValueObject::eValueObjectList;
2849                                 return 1;
2850                             }
2851                         }
2852                     }
2853                     else /*if (ClangASTContext::IsScalarType(root_clang_type))*/
2854                     {
2855                         root = root->GetSyntheticBitFieldChild(index, index, true);
2856                         if (!root.get())
2857                         {
2858                             *first_unparsed = expression_cstr;
2859                             *reason_to_stop = ValueObject::eNoSuchChild;
2860                             *final_result = ValueObject::eInvalid;
2861                             return 0;
2862                         }
2863                         else // we do not know how to expand members of bitfields, so we just return and let the caller do any further processing
2864                         {
2865                             list->Append(root);
2866                             *first_unparsed = end+1; // skip ]
2867                             *reason_to_stop = ValueObject::eRangeOperatorExpanded;
2868                             *final_result = ValueObject::eValueObjectList;
2869                             return 1;
2870                         }
2871                     }
2872                 }
2873                 else // we have a low and a high index
2874                 {
2875                     char *end = NULL;
2876                     unsigned long index_lower = ::strtoul (expression_cstr+1, &end, 0);
2877                     if (!end || end != separator_position) // if something weird is in our way return an error
2878                     {
2879                         *first_unparsed = expression_cstr;
2880                         *reason_to_stop = ValueObject::eUnexpectedSymbol;
2881                         *final_result = ValueObject::eInvalid;
2882                         return 0;
2883                     }
2884                     unsigned long index_higher = ::strtoul (separator_position+1, &end, 0);
2885                     if (!end || end != close_bracket_position) // if something weird is in our way return an error
2886                     {
2887                         *first_unparsed = expression_cstr;
2888                         *reason_to_stop = ValueObject::eUnexpectedSymbol;
2889                         *final_result = ValueObject::eInvalid;
2890                         return 0;
2891                     }
2892                     if (index_lower > index_higher) // swap indices if required
2893                     {
2894                         unsigned long temp = index_lower;
2895                         index_lower = index_higher;
2896                         index_higher = temp;
2897                     }
2898                     if (root_clang_type_info.Test(ClangASTContext::eTypeIsScalar)) // expansion only works for scalars
2899                     {
2900                         root = root->GetSyntheticBitFieldChild(index_lower, index_higher, true);
2901                         if (!root.get())
2902                         {
2903                             *first_unparsed = expression_cstr;
2904                             *reason_to_stop = ValueObject::eNoSuchChild;
2905                             *final_result = ValueObject::eInvalid;
2906                             return 0;
2907                         }
2908                         else
2909                         {
2910                             list->Append(root);
2911                             *first_unparsed = end+1; // skip ]
2912                             *reason_to_stop = ValueObject::eRangeOperatorExpanded;
2913                             *final_result = ValueObject::eValueObjectList;
2914                             return 1;
2915                         }
2916                     }
2917                     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
2918                              *what_next == ValueObject::eDereference &&
2919                              pointee_clang_type_info.Test(ClangASTContext::eTypeIsScalar))
2920                     {
2921                         Error error;
2922                         root = root->Dereference(error);
2923                         if (error.Fail() || !root.get())
2924                         {
2925                             *first_unparsed = expression_cstr;
2926                             *reason_to_stop = ValueObject::eDereferencingFailed;
2927                             *final_result = ValueObject::eInvalid;
2928                             return 0;
2929                         }
2930                         else
2931                         {
2932                             *what_next = ValueObject::eNothing;
2933                             continue;
2934                         }
2935                     }
2936                     else
2937                     {
2938                         for (unsigned long index = index_lower;
2939                              index <= index_higher; index++)
2940                         {
2941                             ValueObjectSP child =
2942                                 root->GetChildAtIndex(index, true);
2943                             list->Append(child);
2944                         }
2945                         *first_unparsed = end+1;
2946                         *reason_to_stop = ValueObject::eRangeOperatorExpanded;
2947                         *final_result = ValueObject::eValueObjectList;
2948                         return index_higher-index_lower+1; // tell me number of items I added to the VOList
2949                     }
2950                 }
2951                 break;
2952             }
2953             default: // some non-[ separator, or something entirely wrong, is in the way
2954             {
2955                 *first_unparsed = expression_cstr;
2956                 *reason_to_stop = ValueObject::eUnexpectedSymbol;
2957                 *final_result = ValueObject::eInvalid;
2958                 return 0;
2959                 break;
2960             }
2961         }
2962     }
2963 }
2964 
2965 void
2966 ValueObject::DumpValueObject
2967 (
2968     Stream &s,
2969     ValueObject *valobj,
2970     const char *root_valobj_name,
2971     uint32_t ptr_depth,
2972     uint32_t curr_depth,
2973     uint32_t max_depth,
2974     bool show_types,
2975     bool show_location,
2976     bool use_objc,
2977     DynamicValueType use_dynamic,
2978     bool use_synth,
2979     bool scope_already_checked,
2980     bool flat_output,
2981     uint32_t omit_summary_depth,
2982     bool ignore_cap,
2983     Format format_override       // Normally the format is in the valobj, but we might want to override this
2984 )
2985 {
2986     if (valobj)
2987     {
2988         bool update_success = valobj->UpdateValueIfNeeded (use_dynamic, true);
2989 
2990         if (update_success && use_dynamic != eNoDynamicValues)
2991         {
2992             ValueObject *dynamic_value = valobj->GetDynamicValue(use_dynamic).get();
2993             if (dynamic_value)
2994                 valobj = dynamic_value;
2995         }
2996 
2997         clang_type_t clang_type = valobj->GetClangType();
2998 
2999         const Flags type_flags (ClangASTContext::GetTypeInfo (clang_type, NULL, NULL));
3000         const char *err_cstr = NULL;
3001         const bool has_children = type_flags.Test (ClangASTContext::eTypeHasChildren);
3002         const bool has_value = type_flags.Test (ClangASTContext::eTypeHasValue);
3003 
3004         const bool print_valobj = flat_output == false || has_value;
3005 
3006         if (print_valobj)
3007         {
3008             if (show_location)
3009             {
3010                 s.Printf("%s: ", valobj->GetLocationAsCString());
3011             }
3012 
3013             s.Indent();
3014 
3015             // Always show the type for the top level items.
3016             if (show_types || (curr_depth == 0 && !flat_output))
3017             {
3018                 const char* typeName = valobj->GetTypeName().AsCString("<invalid type>");
3019                 s.Printf("(%s", typeName);
3020                 // only show dynamic types if the user really wants to see types
3021                 if (show_types && use_dynamic != eNoDynamicValues &&
3022                     (/*strstr(typeName, "id") == typeName ||*/
3023                      ClangASTType::GetMinimumLanguage(valobj->GetClangAST(), valobj->GetClangType()) == eLanguageTypeObjC))
3024                 {
3025                     Process* process = valobj->GetUpdatePoint().GetProcessSP().get();
3026                     if (process == NULL)
3027                         s.Printf(", dynamic type: unknown) ");
3028                     else
3029                     {
3030                         ObjCLanguageRuntime *runtime = process->GetObjCLanguageRuntime();
3031                         if (runtime == NULL)
3032                             s.Printf(", dynamic type: unknown) ");
3033                         else
3034                         {
3035                             ObjCLanguageRuntime::ObjCISA isa = runtime->GetISA(*valobj);
3036                             if (!runtime->IsValidISA(isa))
3037                                 s.Printf(", dynamic type: unknown) ");
3038                             else
3039                                 s.Printf(", dynamic type: %s) ",
3040                                          runtime->GetActualTypeName(isa).GetCString());
3041                         }
3042                     }
3043                 }
3044                 else
3045                     s.Printf(") ");
3046             }
3047 
3048 
3049             if (flat_output)
3050             {
3051                 // If we are showing types, also qualify the C++ base classes
3052                 const bool qualify_cxx_base_classes = show_types;
3053                 valobj->GetExpressionPath(s, qualify_cxx_base_classes);
3054                 s.PutCString(" =");
3055             }
3056             else
3057             {
3058                 const char *name_cstr = root_valobj_name ? root_valobj_name : valobj->GetName().AsCString("");
3059                 s.Printf ("%s =", name_cstr);
3060             }
3061 
3062             if (!scope_already_checked && !valobj->IsInScope())
3063             {
3064                 err_cstr = "out of scope";
3065             }
3066         }
3067 
3068         std::string value_str;
3069         const char *val_cstr = NULL;
3070         const char *sum_cstr = NULL;
3071         SummaryFormat* entry = valobj->GetSummaryFormat().get();
3072 
3073         if (omit_summary_depth > 0)
3074             entry = NULL;
3075 
3076         Format orig_format = kNumFormats;
3077         if (err_cstr == NULL)
3078         {
3079             if (format_override != eFormatDefault)
3080             {
3081                 orig_format = valobj->GetFormat();
3082                 valobj->SetFormat (format_override);
3083             }
3084             val_cstr = valobj->GetValueAsCString();
3085             if (val_cstr)
3086             {
3087                 // Cache the value in our own storage as running summaries might
3088                 // change our value from underneath us
3089                 value_str = val_cstr;
3090             }
3091             if (orig_format != kNumFormats && orig_format != format_override)
3092             {
3093                 valobj->SetFormat (orig_format);
3094                 orig_format = kNumFormats;
3095             }
3096             err_cstr = valobj->GetError().AsCString();
3097         }
3098 
3099         if (err_cstr)
3100         {
3101             s.Printf (" <%s>\n", err_cstr);
3102         }
3103         else
3104         {
3105             const bool is_ref = type_flags.Test (ClangASTContext::eTypeIsReference);
3106             if (print_valobj)
3107             {
3108                 if (omit_summary_depth == 0)
3109                     sum_cstr = valobj->GetSummaryAsCString();
3110 
3111                 // Make sure we have a value and make sure the summary didn't
3112                 // specify that the value should not be printed
3113                 if (!value_str.empty() && (entry == NULL || entry->DoesPrintValue() || sum_cstr == NULL))
3114                     s.Printf(" %s", value_str.c_str());
3115 
3116                 if (sum_cstr)
3117                 {
3118                     // for some reason, using %@ (ObjC description) in a summary string, makes
3119                     // us believe we need to reset ourselves, thus invalidating the content of
3120                     // sum_cstr. Thus, IF we had a valid sum_cstr before, but it is now empty
3121                     // let us recalculate it!
3122                     if (sum_cstr[0] == '\0')
3123                         s.Printf(" %s", valobj->GetSummaryAsCString());
3124                     else
3125                         s.Printf(" %s", sum_cstr);
3126                 }
3127 
3128                 if (use_objc)
3129                 {
3130                     const char *object_desc = valobj->GetObjectDescription();
3131                     if (object_desc)
3132                         s.Printf(" %s\n", object_desc);
3133                     else
3134                         s.Printf (" [no Objective-C description available]\n");
3135                     return;
3136                 }
3137             }
3138 
3139             if (curr_depth < max_depth)
3140             {
3141                 // We will show children for all concrete types. We won't show
3142                 // pointer contents unless a pointer depth has been specified.
3143                 // We won't reference contents unless the reference is the
3144                 // root object (depth of zero).
3145                 bool print_children = true;
3146 
3147                 // Use a new temporary pointer depth in case we override the
3148                 // current pointer depth below...
3149                 uint32_t curr_ptr_depth = ptr_depth;
3150 
3151                 const bool is_ptr = type_flags.Test (ClangASTContext::eTypeIsPointer);
3152                 if (is_ptr || is_ref)
3153                 {
3154                     // We have a pointer or reference whose value is an address.
3155                     // Make sure that address is not NULL
3156                     AddressType ptr_address_type;
3157                     if (valobj->GetPointerValue (&ptr_address_type) == 0)
3158                         print_children = false;
3159 
3160                     else if (is_ref && curr_depth == 0)
3161                     {
3162                         // If this is the root object (depth is zero) that we are showing
3163                         // and it is a reference, and no pointer depth has been supplied
3164                         // print out what it references. Don't do this at deeper depths
3165                         // otherwise we can end up with infinite recursion...
3166                         curr_ptr_depth = 1;
3167                     }
3168 
3169                     if (curr_ptr_depth == 0)
3170                         print_children = false;
3171                 }
3172 
3173                 if (print_children && (!entry || entry->DoesPrintChildren() || !sum_cstr))
3174                 {
3175                     ValueObjectSP synth_valobj = valobj->GetSyntheticValue(use_synth ?
3176                                                                          eUseSyntheticFilter :
3177                                                                          eNoSyntheticFilter);
3178                     uint32_t num_children = synth_valobj->GetNumChildren();
3179                     bool print_dotdotdot = false;
3180                     if (num_children)
3181                     {
3182                         if (flat_output)
3183                         {
3184                             if (print_valobj)
3185                                 s.EOL();
3186                         }
3187                         else
3188                         {
3189                             if (print_valobj)
3190                                 s.PutCString(is_ref ? ": {\n" : " {\n");
3191                             s.IndentMore();
3192                         }
3193 
3194                         uint32_t max_num_children = valobj->GetUpdatePoint().GetTargetSP()->GetMaximumNumberOfChildrenToDisplay();
3195 
3196                         if (num_children > max_num_children && !ignore_cap)
3197                         {
3198                             num_children = max_num_children;
3199                             print_dotdotdot = true;
3200                         }
3201 
3202                         for (uint32_t idx=0; idx<num_children; ++idx)
3203                         {
3204                             ValueObjectSP child_sp(synth_valobj->GetChildAtIndex(idx, true));
3205                             if (child_sp.get())
3206                             {
3207                                 DumpValueObject (s,
3208                                                  child_sp.get(),
3209                                                  NULL,
3210                                                  (is_ptr || is_ref) ? curr_ptr_depth - 1 : curr_ptr_depth,
3211                                                  curr_depth + 1,
3212                                                  max_depth,
3213                                                  show_types,
3214                                                  show_location,
3215                                                  false,
3216                                                  use_dynamic,
3217                                                  use_synth,
3218                                                  true,
3219                                                  flat_output,
3220                                                  omit_summary_depth > 1 ? omit_summary_depth - 1 : 0,
3221                                                  ignore_cap,
3222                                                  format_override);
3223                             }
3224                         }
3225 
3226                         if (!flat_output)
3227                         {
3228                             if (print_dotdotdot)
3229                             {
3230                                 valobj->GetUpdatePoint().GetTargetSP()->GetDebugger().GetCommandInterpreter().ChildrenTruncated();
3231                                 s.Indent("...\n");
3232                             }
3233                             s.IndentLess();
3234                             s.Indent("}\n");
3235                         }
3236                     }
3237                     else if (has_children)
3238                     {
3239                         // Aggregate, no children...
3240                         if (print_valobj)
3241                             s.PutCString(" {}\n");
3242                     }
3243                     else
3244                     {
3245                         if (print_valobj)
3246                             s.EOL();
3247                     }
3248 
3249                 }
3250                 else
3251                 {
3252                     s.EOL();
3253                 }
3254             }
3255             else
3256             {
3257                 if (has_children && print_valobj)
3258                 {
3259                     s.PutCString("{...}\n");
3260                 }
3261             }
3262         }
3263     }
3264 }
3265 
3266 
3267 ValueObjectSP
3268 ValueObject::CreateConstantValue (const ConstString &name)
3269 {
3270     ValueObjectSP valobj_sp;
3271 
3272     if (UpdateValueIfNeeded(false) && m_error.Success())
3273     {
3274         ExecutionContextScope *exe_scope = GetExecutionContextScope();
3275         if (exe_scope)
3276         {
3277             ExecutionContext exe_ctx;
3278             exe_scope->CalculateExecutionContext(exe_ctx);
3279 
3280             clang::ASTContext *ast = GetClangAST ();
3281 
3282             DataExtractor data;
3283             data.SetByteOrder (m_data.GetByteOrder());
3284             data.SetAddressByteSize(m_data.GetAddressByteSize());
3285 
3286             m_error = m_value.GetValueAsData (&exe_ctx, ast, data, 0, GetModule());
3287 
3288             valobj_sp = ValueObjectConstResult::Create (exe_scope,
3289                                                         ast,
3290                                                         GetClangType(),
3291                                                         name,
3292                                                         data,
3293 													    GetAddressOf());
3294         }
3295     }
3296 
3297     if (!valobj_sp)
3298     {
3299         valobj_sp = ValueObjectConstResult::Create (NULL, m_error);
3300     }
3301     return valobj_sp;
3302 }
3303 
3304 ValueObjectSP
3305 ValueObject::Dereference (Error &error)
3306 {
3307     if (m_deref_valobj)
3308         return m_deref_valobj->GetSP();
3309 
3310     const bool is_pointer_type = IsPointerType();
3311     if (is_pointer_type)
3312     {
3313         bool omit_empty_base_classes = true;
3314         bool ignore_array_bounds = false;
3315 
3316         std::string child_name_str;
3317         uint32_t child_byte_size = 0;
3318         int32_t child_byte_offset = 0;
3319         uint32_t child_bitfield_bit_size = 0;
3320         uint32_t child_bitfield_bit_offset = 0;
3321         bool child_is_base_class = false;
3322         bool child_is_deref_of_parent = false;
3323         const bool transparent_pointers = false;
3324         clang::ASTContext *clang_ast = GetClangAST();
3325         clang_type_t clang_type = GetClangType();
3326         clang_type_t child_clang_type;
3327 
3328         ExecutionContext exe_ctx;
3329         GetExecutionContextScope()->CalculateExecutionContext (exe_ctx);
3330 
3331         child_clang_type = ClangASTContext::GetChildClangTypeAtIndex (&exe_ctx,
3332                                                                       clang_ast,
3333                                                                       GetName().GetCString(),
3334                                                                       clang_type,
3335                                                                       0,
3336                                                                       transparent_pointers,
3337                                                                       omit_empty_base_classes,
3338                                                                       ignore_array_bounds,
3339                                                                       child_name_str,
3340                                                                       child_byte_size,
3341                                                                       child_byte_offset,
3342                                                                       child_bitfield_bit_size,
3343                                                                       child_bitfield_bit_offset,
3344                                                                       child_is_base_class,
3345                                                                       child_is_deref_of_parent);
3346         if (child_clang_type && child_byte_size)
3347         {
3348             ConstString child_name;
3349             if (!child_name_str.empty())
3350                 child_name.SetCString (child_name_str.c_str());
3351 
3352             m_deref_valobj = new ValueObjectChild (*this,
3353                                                    clang_ast,
3354                                                    child_clang_type,
3355                                                    child_name,
3356                                                    child_byte_size,
3357                                                    child_byte_offset,
3358                                                    child_bitfield_bit_size,
3359                                                    child_bitfield_bit_offset,
3360                                                    child_is_base_class,
3361                                                    child_is_deref_of_parent,
3362                                                    eAddressTypeInvalid);
3363         }
3364     }
3365 
3366     if (m_deref_valobj)
3367     {
3368         error.Clear();
3369         return m_deref_valobj->GetSP();
3370     }
3371     else
3372     {
3373         StreamString strm;
3374         GetExpressionPath(strm, true);
3375 
3376         if (is_pointer_type)
3377             error.SetErrorStringWithFormat("dereference failed: (%s) %s", GetTypeName().AsCString("<invalid type>"), strm.GetString().c_str());
3378         else
3379             error.SetErrorStringWithFormat("not a pointer type: (%s) %s", GetTypeName().AsCString("<invalid type>"), strm.GetString().c_str());
3380         return ValueObjectSP();
3381     }
3382 }
3383 
3384 ValueObjectSP
3385 ValueObject::AddressOf (Error &error)
3386 {
3387     if (m_addr_of_valobj_sp)
3388         return m_addr_of_valobj_sp;
3389 
3390     AddressType address_type = eAddressTypeInvalid;
3391     const bool scalar_is_load_address = false;
3392     addr_t addr = GetAddressOf (scalar_is_load_address, &address_type);
3393     error.Clear();
3394     if (addr != LLDB_INVALID_ADDRESS)
3395     {
3396         switch (address_type)
3397         {
3398         default:
3399         case eAddressTypeInvalid:
3400             {
3401                 StreamString expr_path_strm;
3402                 GetExpressionPath(expr_path_strm, true);
3403                 error.SetErrorStringWithFormat("'%s' is not in memory", expr_path_strm.GetString().c_str());
3404             }
3405             break;
3406 
3407         case eAddressTypeFile:
3408         case eAddressTypeLoad:
3409         case eAddressTypeHost:
3410             {
3411                 clang::ASTContext *ast = GetClangAST();
3412                 clang_type_t clang_type = GetClangType();
3413                 if (ast && clang_type)
3414                 {
3415                     std::string name (1, '&');
3416                     name.append (m_name.AsCString(""));
3417                     m_addr_of_valobj_sp = ValueObjectConstResult::Create (GetExecutionContextScope(),
3418                                                                           ast,
3419                                                                           ClangASTContext::CreatePointerType (ast, clang_type),
3420                                                                           ConstString (name.c_str()),
3421                                                                           addr,
3422                                                                           eAddressTypeInvalid,
3423                                                                           m_data.GetAddressByteSize());
3424                 }
3425             }
3426             break;
3427         }
3428     }
3429     return m_addr_of_valobj_sp;
3430 }
3431 
3432 
3433 ValueObjectSP
3434 ValueObject::CastPointerType (const char *name, ClangASTType &clang_ast_type)
3435 {
3436     ValueObjectSP valobj_sp;
3437     AddressType address_type;
3438     addr_t ptr_value = GetPointerValue (&address_type);
3439 
3440     if (ptr_value != LLDB_INVALID_ADDRESS)
3441     {
3442         Address ptr_addr (NULL, ptr_value);
3443 
3444         valobj_sp = ValueObjectMemory::Create (GetExecutionContextScope(),
3445                                                name,
3446                                                ptr_addr,
3447                                                clang_ast_type);
3448     }
3449     return valobj_sp;
3450 }
3451 
3452 ValueObjectSP
3453 ValueObject::CastPointerType (const char *name, TypeSP &type_sp)
3454 {
3455     ValueObjectSP valobj_sp;
3456     AddressType address_type;
3457     addr_t ptr_value = GetPointerValue (&address_type);
3458 
3459     if (ptr_value != LLDB_INVALID_ADDRESS)
3460     {
3461         Address ptr_addr (NULL, ptr_value);
3462 
3463         valobj_sp = ValueObjectMemory::Create (GetExecutionContextScope(),
3464                                                name,
3465                                                ptr_addr,
3466                                                type_sp);
3467     }
3468     return valobj_sp;
3469 }
3470 
3471 ValueObject::EvaluationPoint::EvaluationPoint () :
3472     ExecutionContextScope(),
3473     m_thread_id (LLDB_INVALID_UID),
3474     m_mod_id ()
3475 {
3476 }
3477 
3478 ValueObject::EvaluationPoint::EvaluationPoint (ExecutionContextScope *exe_scope, bool use_selected):
3479     ExecutionContextScope (),
3480     m_needs_update (true),
3481     m_first_update (true),
3482     m_thread_id (LLDB_INVALID_THREAD_ID),
3483     m_mod_id ()
3484 
3485 {
3486     ExecutionContext exe_ctx;
3487 
3488     if (exe_scope)
3489         exe_scope->CalculateExecutionContext(exe_ctx);
3490     Target *target = exe_ctx.GetTargetPtr();
3491     if (target != NULL)
3492     {
3493         m_target_sp = target->shared_from_this();
3494         m_process_sp = exe_ctx.GetProcessSP();
3495         if (!m_process_sp)
3496             m_process_sp = target->GetProcessSP();
3497 
3498         if (m_process_sp)
3499         {
3500             m_mod_id = m_process_sp->GetModID();
3501 
3502             Thread *thread = exe_ctx.GetThreadPtr();
3503 
3504             if (thread == NULL)
3505             {
3506                 if (use_selected)
3507                     thread = m_process_sp->GetThreadList().GetSelectedThread().get();
3508             }
3509 
3510             if (thread != NULL)
3511             {
3512                 m_thread_id = thread->GetIndexID();
3513 
3514                 StackFrame *frame = exe_ctx.GetFramePtr();
3515                 if (frame == NULL)
3516                 {
3517                     if (use_selected)
3518                     {
3519                         frame = thread->GetSelectedFrame().get();
3520                         if (frame)
3521                             m_stack_id = frame->GetStackID();
3522                     }
3523                 }
3524                 else
3525                     m_stack_id = frame->GetStackID();
3526             }
3527         }
3528     }
3529 }
3530 
3531 ValueObject::EvaluationPoint::EvaluationPoint (const ValueObject::EvaluationPoint &rhs) :
3532     m_needs_update(true),
3533     m_first_update(true),
3534     m_target_sp (rhs.m_target_sp),
3535     m_process_sp (rhs.m_process_sp),
3536     m_thread_id (rhs.m_thread_id),
3537     m_stack_id (rhs.m_stack_id),
3538     m_mod_id ()
3539 {
3540 }
3541 
3542 ValueObject::EvaluationPoint::~EvaluationPoint ()
3543 {
3544 }
3545 
3546 Target *
3547 ValueObject::EvaluationPoint::CalculateTarget ()
3548 {
3549     return m_target_sp.get();
3550 }
3551 
3552 Process *
3553 ValueObject::EvaluationPoint::CalculateProcess ()
3554 {
3555     return m_process_sp.get();
3556 }
3557 
3558 Thread *
3559 ValueObject::EvaluationPoint::CalculateThread ()
3560 {
3561     ExecutionContextScope *exe_scope;
3562     SyncWithProcessState(exe_scope);
3563     if (exe_scope)
3564         return exe_scope->CalculateThread();
3565     else
3566         return NULL;
3567 }
3568 
3569 StackFrame *
3570 ValueObject::EvaluationPoint::CalculateStackFrame ()
3571 {
3572     ExecutionContextScope *exe_scope;
3573     SyncWithProcessState(exe_scope);
3574     if (exe_scope)
3575         return exe_scope->CalculateStackFrame();
3576     else
3577         return NULL;
3578 }
3579 
3580 void
3581 ValueObject::EvaluationPoint::CalculateExecutionContext (ExecutionContext &exe_ctx)
3582 {
3583     ExecutionContextScope *exe_scope;
3584     SyncWithProcessState(exe_scope);
3585     if (exe_scope)
3586         return exe_scope->CalculateExecutionContext (exe_ctx);
3587 }
3588 
3589 // This function checks the EvaluationPoint against the current process state.  If the current
3590 // state matches the evaluation point, or the evaluation point is already invalid, then we return
3591 // false, meaning "no change".  If the current state is different, we update our state, and return
3592 // true meaning "yes, change".  If we did see a change, we also set m_needs_update to true, so
3593 // future calls to NeedsUpdate will return true.
3594 // exe_scope will be set to the current execution context scope.
3595 
3596 bool
3597 ValueObject::EvaluationPoint::SyncWithProcessState(ExecutionContextScope *&exe_scope)
3598 {
3599 
3600     // Start with the target, if it is NULL, then we're obviously not going to get any further:
3601     exe_scope = m_target_sp.get();
3602 
3603     if (exe_scope == NULL)
3604         return false;
3605 
3606     // If we don't have a process nothing can change.
3607     if (!m_process_sp)
3608         return false;
3609 
3610     exe_scope = m_process_sp.get();
3611 
3612     // If our stop id is the current stop ID, nothing has changed:
3613     ProcessModID current_mod_id = m_process_sp->GetModID();
3614 
3615     // If the current stop id is 0, either we haven't run yet, or the process state has been cleared.
3616     // In either case, we aren't going to be able to sync with the process state.
3617     if (current_mod_id.GetStopID() == 0)
3618         return false;
3619 
3620     bool changed;
3621 
3622     if (m_mod_id.IsValid())
3623     {
3624         if (m_mod_id == current_mod_id)
3625         {
3626             // Everything is already up to date in this object, no need to
3627             // update the execution context scope.
3628             changed = false;
3629         }
3630         else
3631         {
3632             m_mod_id = current_mod_id;
3633             m_needs_update = true;
3634             changed = true;
3635         }
3636     }
3637 
3638     // Now re-look up the thread and frame in case the underlying objects have gone away & been recreated.
3639     // That way we'll be sure to return a valid exe_scope.
3640     // If we used to have a thread or a frame but can't find it anymore, then mark ourselves as invalid.
3641 
3642     if (m_thread_id != LLDB_INVALID_THREAD_ID)
3643     {
3644         Thread *our_thread = m_process_sp->GetThreadList().FindThreadByIndexID (m_thread_id).get();
3645         if (our_thread == NULL)
3646         {
3647             SetInvalid();
3648         }
3649         else
3650         {
3651             exe_scope = our_thread;
3652 
3653             if (m_stack_id.IsValid())
3654             {
3655                 StackFrame *our_frame = our_thread->GetFrameWithStackID (m_stack_id).get();
3656                 if (our_frame == NULL)
3657                     SetInvalid();
3658                 else
3659                     exe_scope = our_frame;
3660             }
3661         }
3662     }
3663     return changed;
3664 }
3665 
3666 void
3667 ValueObject::EvaluationPoint::SetUpdated ()
3668 {
3669     if (m_process_sp)
3670         m_mod_id = m_process_sp->GetModID();
3671     m_first_update = false;
3672     m_needs_update = false;
3673 }
3674 
3675 
3676 bool
3677 ValueObject::EvaluationPoint::SetContext (ExecutionContextScope *exe_scope)
3678 {
3679     if (!IsValid())
3680         return false;
3681 
3682     bool needs_update = false;
3683 
3684     // The target has to be non-null, and the
3685     Target *target = exe_scope->CalculateTarget();
3686     if (target != NULL)
3687     {
3688         Target *old_target = m_target_sp.get();
3689         assert (target == old_target);
3690         Process *process = exe_scope->CalculateProcess();
3691         if (process != NULL)
3692         {
3693             // FOR NOW - assume you can't update variable objects across process boundaries.
3694             Process *old_process = m_process_sp.get();
3695             assert (process == old_process);
3696             ProcessModID current_mod_id = process->GetModID();
3697             if (m_mod_id != current_mod_id)
3698             {
3699                 needs_update = true;
3700                 m_mod_id = current_mod_id;
3701             }
3702             // See if we're switching the thread or stack context.  If no thread is given, this is
3703             // being evaluated in a global context.
3704             Thread *thread = exe_scope->CalculateThread();
3705             if (thread != NULL)
3706             {
3707                 user_id_t new_thread_index = thread->GetIndexID();
3708                 if (new_thread_index != m_thread_id)
3709                 {
3710                     needs_update = true;
3711                     m_thread_id = new_thread_index;
3712                     m_stack_id.Clear();
3713                 }
3714 
3715                 StackFrame *new_frame = exe_scope->CalculateStackFrame();
3716                 if (new_frame != NULL)
3717                 {
3718                     if (new_frame->GetStackID() != m_stack_id)
3719                     {
3720                         needs_update = true;
3721                         m_stack_id = new_frame->GetStackID();
3722                     }
3723                 }
3724                 else
3725                 {
3726                     m_stack_id.Clear();
3727                     needs_update = true;
3728                 }
3729             }
3730             else
3731             {
3732                 // If this had been given a thread, and now there is none, we should update.
3733                 // Otherwise we don't have to do anything.
3734                 if (m_thread_id != LLDB_INVALID_UID)
3735                 {
3736                     m_thread_id = LLDB_INVALID_UID;
3737                     m_stack_id.Clear();
3738                     needs_update = true;
3739                 }
3740             }
3741         }
3742         else
3743         {
3744             // If there is no process, then we don't need to update anything.
3745             // But if we're switching from having a process to not, we should try to update.
3746             if (m_process_sp.get() != NULL)
3747             {
3748                 needs_update = true;
3749                 m_process_sp.reset();
3750                 m_thread_id = LLDB_INVALID_UID;
3751                 m_stack_id.Clear();
3752             }
3753         }
3754     }
3755     else
3756     {
3757         // If there's no target, nothing can change so we don't need to update anything.
3758         // But if we're switching from having a target to not, we should try to update.
3759         if (m_target_sp.get() != NULL)
3760         {
3761             needs_update = true;
3762             m_target_sp.reset();
3763             m_process_sp.reset();
3764             m_thread_id = LLDB_INVALID_UID;
3765             m_stack_id.Clear();
3766         }
3767     }
3768     if (!m_needs_update)
3769         m_needs_update = needs_update;
3770 
3771     return needs_update;
3772 }
3773 
3774 void
3775 ValueObject::ClearUserVisibleData()
3776 {
3777     m_location_str.clear();
3778     m_value_str.clear();
3779     m_summary_str.clear();
3780     m_object_desc_str.clear();
3781     m_is_getting_summary = false;
3782 }
3783 
3784 SymbolContextScope *
3785 ValueObject::GetSymbolContextScope()
3786 {
3787     if (m_parent)
3788     {
3789         if (!m_parent->IsPointerOrReferenceType())
3790             return m_parent->GetSymbolContextScope();
3791     }
3792     return NULL;
3793 }
3794