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