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ValueObjectDynamicValue.cpp
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1 //===-- ValueObjectDynamicValue.cpp ---------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
10 #include "lldb/Core/Value.h"
11 #include "lldb/Core/ValueObject.h"
13 #include "lldb/Symbol/Type.h"
16 #include "lldb/Target/Process.h"
17 #include "lldb/Target/Target.h"
19 #include "lldb/Utility/LLDBLog.h"
20 #include "lldb/Utility/Log.h"
21 #include "lldb/Utility/Scalar.h"
22 #include "lldb/Utility/Status.h"
23 #include "lldb/lldb-types.h"
24 
25 #include <cstring>
26 namespace lldb_private {
27 class Declaration;
28 }
29 
30 using namespace lldb_private;
31 
33  ValueObject &parent, lldb::DynamicValueType use_dynamic)
34  : ValueObject(parent), m_address(), m_dynamic_type_info(),
35  m_use_dynamic(use_dynamic) {
36  SetName(parent.GetName());
37 }
38 
40  const bool success = UpdateValueIfNeeded(false);
41  if (success) {
43  return m_value.GetCompilerType();
44  else
45  return m_parent->GetCompilerType();
46  }
47  return m_parent->GetCompilerType();
48 }
49 
51  const bool success = UpdateValueIfNeeded(false);
52  if (success) {
55  }
56  return m_parent->GetTypeName();
57 }
58 
60  const bool success = UpdateValueIfNeeded(false);
61  if (success && m_type_impl.IsValid()) {
62  return m_type_impl;
63  }
64  return m_parent->GetTypeImpl();
65 }
66 
68  const bool success = UpdateValueIfNeeded(false);
69  if (success) {
72  }
74 }
75 
77  const bool success = UpdateValueIfNeeded(false);
78  if (success) {
83  }
84  return m_parent->GetDisplayTypeName();
85 }
86 
88  const bool success = UpdateValueIfNeeded(false);
89  if (success && m_dynamic_type_info.HasType()) {
91  auto children_count = GetCompilerType().GetNumChildren(true, &exe_ctx);
92  return children_count <= max ? children_count : max;
93  } else
94  return m_parent->GetNumChildren(max);
95 }
96 
97 llvm::Optional<uint64_t> ValueObjectDynamicValue::GetByteSize() {
98  const bool success = UpdateValueIfNeeded(false);
99  if (success && m_dynamic_type_info.HasType()) {
101  return m_value.GetValueByteSize(nullptr, &exe_ctx);
102  } else
103  return m_parent->GetByteSize();
104 }
105 
107  return m_parent->GetValueType();
108 }
109 
111  SetValueIsValid(false);
112  m_error.Clear();
113 
114  if (!m_parent->UpdateValueIfNeeded(false)) {
115  // The dynamic value failed to get an error, pass the error along
116  if (m_error.Success() && m_parent->GetError().Fail())
118  return false;
119  }
120 
121  // Setting our type_sp to NULL will route everything back through our parent
122  // which is equivalent to not using dynamic values.
125  return true;
126  }
127 
129  Target *target = exe_ctx.GetTargetPtr();
130  if (target) {
133  }
134 
135  // First make sure our Type and/or Address haven't changed:
136  Process *process = exe_ctx.GetProcessPtr();
137  if (!process)
138  return false;
139 
140  TypeAndOrName class_type_or_name;
141  Address dynamic_address;
142  bool found_dynamic_type = false;
143  Value::ValueType value_type;
144 
145  LanguageRuntime *runtime = nullptr;
146 
148  if (known_type != lldb::eLanguageTypeUnknown &&
149  known_type != lldb::eLanguageTypeC) {
150  runtime = process->GetLanguageRuntime(known_type);
151  if (runtime)
152  found_dynamic_type = runtime->GetDynamicTypeAndAddress(
153  *m_parent, m_use_dynamic, class_type_or_name, dynamic_address,
154  value_type);
155  } else {
157  if (runtime)
158  found_dynamic_type = runtime->GetDynamicTypeAndAddress(
159  *m_parent, m_use_dynamic, class_type_or_name, dynamic_address,
160  value_type);
161 
162  if (!found_dynamic_type) {
163  runtime = process->GetLanguageRuntime(lldb::eLanguageTypeObjC);
164  if (runtime)
165  found_dynamic_type = runtime->GetDynamicTypeAndAddress(
166  *m_parent, m_use_dynamic, class_type_or_name, dynamic_address,
167  value_type);
168  }
169  }
170 
171  // Getting the dynamic value may have run the program a bit, and so marked us
172  // as needing updating, but we really don't...
173 
175 
176  if (runtime && found_dynamic_type) {
177  if (class_type_or_name.HasType()) {
178  m_type_impl =
180  runtime->FixUpDynamicType(class_type_or_name, *m_parent)
181  .GetCompilerType());
182  } else {
183  m_type_impl.Clear();
184  }
185  } else {
186  m_type_impl.Clear();
187  }
188 
189  // If we don't have a dynamic type, then make ourselves just a echo of our
190  // parent. Or we could return false, and make ourselves an echo of our
191  // parent?
192  if (!found_dynamic_type) {
194  SetValueDidChange(true);
198  m_error = m_value.GetValueAsData(&exe_ctx, m_data, GetModule().get());
199  return m_error.Success();
200  }
201 
202  Value old_value(m_value);
203 
204  Log *log = GetLog(LLDBLog::Types);
205 
206  bool has_changed_type = false;
207 
208  if (!m_dynamic_type_info) {
209  m_dynamic_type_info = class_type_or_name;
210  has_changed_type = true;
211  } else if (class_type_or_name != m_dynamic_type_info) {
212  // We are another type, we need to tear down our children...
213  m_dynamic_type_info = class_type_or_name;
214  SetValueDidChange(true);
215  has_changed_type = true;
216  }
217 
218  if (has_changed_type)
220 
221  if (!m_address.IsValid() || m_address != dynamic_address) {
222  if (m_address.IsValid())
223  SetValueDidChange(true);
224 
225  // We've moved, so we should be fine...
226  m_address = dynamic_address;
227  lldb::TargetSP target_sp(GetTargetSP());
228  lldb::addr_t load_address = m_address.GetLoadAddress(target_sp.get());
229  m_value.GetScalar() = load_address;
230  }
231 
232  if (runtime)
235 
237 
238  m_value.SetValueType(value_type);
239 
240  if (has_changed_type && log)
241  LLDB_LOGF(log, "[%s %p] has a new dynamic type %s", GetName().GetCString(),
242  static_cast<void *>(this), GetTypeName().GetCString());
243 
245  // The variable value is in the Scalar value inside the m_value. We can
246  // point our m_data right to it.
247  m_error = m_value.GetValueAsData(&exe_ctx, m_data, GetModule().get());
248  if (m_error.Success()) {
249  if (!CanProvideValue()) {
250  // this value object represents an aggregate type whose children have
251  // values, but this object does not. So we say we are changed if our
252  // location has changed.
254  m_value.GetScalar() != old_value.GetScalar());
255  }
256 
257  SetValueIsValid(true);
258  return true;
259  }
260  }
261 
262  // We get here if we've failed above...
263  SetValueIsValid(false);
264  return false;
265 }
266 
268 
270  Status &error) {
271  if (!UpdateValueIfNeeded(false)) {
272  error.SetErrorString("unable to read value");
273  return false;
274  }
275 
276  uint64_t my_value = GetValueAsUnsigned(UINT64_MAX);
277  uint64_t parent_value = m_parent->GetValueAsUnsigned(UINT64_MAX);
278 
279  if (my_value == UINT64_MAX || parent_value == UINT64_MAX) {
280  error.SetErrorString("unable to read value");
281  return false;
282  }
283 
284  // if we are at an offset from our parent, in order to set ourselves
285  // correctly we would need to change the new value so that it refers to the
286  // correct dynamic type. we choose not to deal with that - if anything more
287  // than a value overwrite is required, you should be using the expression
288  // parser instead of the value editing facility
289  if (my_value != parent_value) {
290  // but NULL'ing out a value should always be allowed
291  if (strcmp(value_str, "0")) {
292  error.SetErrorString(
293  "unable to modify dynamic value, use 'expression' command");
294  return false;
295  }
296  }
297 
298  bool ret_val = m_parent->SetValueFromCString(value_str, error);
299  SetNeedsUpdate();
300  return ret_val;
301 }
302 
304  if (!UpdateValueIfNeeded(false)) {
305  error.SetErrorString("unable to read value");
306  return false;
307  }
308 
309  uint64_t my_value = GetValueAsUnsigned(UINT64_MAX);
310  uint64_t parent_value = m_parent->GetValueAsUnsigned(UINT64_MAX);
311 
312  if (my_value == UINT64_MAX || parent_value == UINT64_MAX) {
313  error.SetErrorString("unable to read value");
314  return false;
315  }
316 
317  // if we are at an offset from our parent, in order to set ourselves
318  // correctly we would need to change the new value so that it refers to the
319  // correct dynamic type. we choose not to deal with that - if anything more
320  // than a value overwrite is required, you should be using the expression
321  // parser instead of the value editing facility
322  if (my_value != parent_value) {
323  // but NULL'ing out a value should always be allowed
324  lldb::offset_t offset = 0;
325 
326  if (data.GetAddress(&offset) != 0) {
327  error.SetErrorString(
328  "unable to modify dynamic value, use 'expression' command");
329  return false;
330  }
331  }
332 
333  bool ret_val = m_parent->SetData(data, error);
334  SetNeedsUpdate();
335  return ret_val;
336 }
337 
339  lldb::LanguageType lang) {
341  if (m_parent)
343 }
344 
347  if (m_parent)
350  } else
352 }
353 
355  if (m_parent)
357  return false;
358 }
359 
361  if (m_parent)
364 }
365 
367  if (m_parent)
368  return m_parent->GetDeclaration(decl);
369 
370  return ValueObject::GetDeclaration(decl);
371 }
372 
374  if (m_parent)
375  return m_parent->GetLanguageFlags();
376  return this->ValueObject::GetLanguageFlags();
377 }
378 
380  if (m_parent)
381  m_parent->SetLanguageFlags(flags);
382  else
383  this->ValueObject::SetLanguageFlags(flags);
384 }
lldb_private::LLDBLog::Types
@ Types
lldb_private::ValueObject::GetValueAsUnsigned
virtual uint64_t GetValueAsUnsigned(uint64_t fail_value, bool *success=nullptr)
Definition: ValueObject.cpp:1090
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Definition: ExecutionContext.h:292
lldb_private::ArchSpec::GetByteOrder
lldb::ByteOrder GetByteOrder() const
Returns the byte order for the architecture specification.
Definition: ArchSpec.cpp:733
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virtual bool IsInScope()
Definition: ValueObject.h:420
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CompilerType GetCompilerTypeImpl() override
Definition: ValueObjectDynamicValue.cpp:39
lldb_private::ValueObject::CanProvideValue
virtual bool CanProvideValue()
Definition: ValueObject.cpp:3103
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uint64_t GetAddress(lldb::offset_t *offset_ptr) const
Extract an address from *offset_ptr.
Definition: DataExtractor.cpp:649
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CompilerType GetCompilerType() const
Definition: Type.h:411
lldb_private::ValueObject::SetValueIsValid
void SetValueIsValid(bool valid)
Definition: ValueObject.h:980
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bool IsValid() const
Check if the object state is valid.
Definition: Address.h:345
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llvm::Optional< uint64_t > GetByteSize() override
Definition: ValueObjectDynamicValue.cpp:97
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virtual void SetLanguageFlags(uint64_t flags)
Definition: ValueObject.h:791
lldb_private::ValueObjectDynamicValue::UpdateValue
bool UpdateValue() override
Definition: ValueObjectDynamicValue.cpp:110
lldb_private::ValueObject::GetValue
const Value & GetValue() const
Definition: ValueObject.h:497
lldb_private::Value
Definition: Value.h:38
lldb::eNoDynamicValues
@ eNoDynamicValues
Definition: lldb-enumerations.h:495
lldb_private::Value::SetValueType
void SetValueType(ValueType value_type)
Definition: Value.h:89
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Process * GetProcessPtr() const
Returns a pointer to the process object.
Definition: ExecutionContext.cpp:206
lldb_private::Value::GetValueAsData
Status GetValueAsData(ExecutionContext *exe_ctx, DataExtractor &data, Module *module)
Definition: Value.cpp:298
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bool HasName() const
Definition: Type.cpp:800
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uint64_t GetLanguageFlags() override
Definition: ValueObjectDynamicValue.cpp:373
lldb_private::Value::GetValueType
ValueType GetValueType() const
Definition: Value.cpp:106
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void SetUpdated()
Definition: ValueObject.cpp:2922
lldb_private::LanguageRuntime::GetDynamicTypeAndAddress
virtual bool GetDynamicTypeAndAddress(ValueObject &in_value, lldb::DynamicValueType use_dynamic, TypeAndOrName &class_type_or_name, Address &address, Value::ValueType &value_type)=0
LLDB_LOGF
#define LLDB_LOGF(log,...)
Definition: Log.h:343
lldb_private::Process
Definition: Process.h:338
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ConstString GetQualifiedTypeName() override
Definition: ValueObjectDynamicValue.cpp:67
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void SetValueDidChange(bool value_changed)
Definition: ValueObject.h:976
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Programming language type.
Definition: lldb-enumerations.h:436
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virtual bool IsSyntheticChildrenGenerated()
Definition: ValueObject.h:641
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Definition: lldb-types.h:87
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void SetPreferredDisplayLanguage(lldb::LanguageType lt)
Definition: ValueObject.h:713
lldb_private::ValueObjectDynamicValue::m_use_dynamic
lldb::DynamicValueType m_use_dynamic
Definition: ValueObjectDynamicValue.h:112
lldb_private::ValueObjectDynamicValue::GetPreferredDisplayLanguage
lldb::LanguageType GetPreferredDisplayLanguage() override
Definition: ValueObjectDynamicValue.cpp:345
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uint64_t addr_t
Definition: lldb-types.h:83
lldb_private::ValueObject::GetQualifiedTypeName
virtual ConstString GetQualifiedTypeName()
Definition: ValueObject.h:369
lldb_private::ValueObject::m_preferred_display_language
lldb::LanguageType m_preferred_display_language
Definition: ValueObject.h:900
ValueObjectDynamicValue.h
lldb_private::TypeAndOrName::Clear
void Clear()
Definition: Type.cpp:795
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Definition: Target.h:467
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virtual ConstString GetTypeName()
Definition: ValueObject.h:365
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TypeAndOrName m_dynamic_type_info
Definition: ValueObjectDynamicValue.h:111
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void SetSyntheticChildrenGenerated(bool b) override
Definition: ValueObjectDynamicValue.cpp:360
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const Status & GetError()
Definition: ValueObject.cpp:283
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void SetCompilerType(const CompilerType &compiler_type)
Definition: Value.cpp:251
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DataExtractor m_data
A data extractor that can be used to extract the value.
Definition: ValueObject.h:851
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bool IsValid() const
Definition: Type.cpp:902
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lldb_private::DataExtractor::SetByteOrder
void SetByteOrder(lldb::ByteOrder byte_order)
Set the byte_order value.
Definition: DataExtractor.h:931
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const Scalar & GetScalar() const
Definition: Value.h:112
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virtual void SetSyntheticChildrenGenerated(bool b)
Definition: ValueObject.h:645
error
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Definition: CommandReturnObject.cpp:17
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bool Success() const
Test for success condition.
Definition: Status.cpp:287
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ConstString GetDisplayTypeName() const
Definition: CompilerType.cpp:284
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Definition: Type.cpp:761
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ValueObjectDynamicValue(ValueObject &parent, lldb::DynamicValueType use_dynamic)
Definition: ValueObjectDynamicValue.cpp:32
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Definition: DataExtractor.h:48
Log.h
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virtual TypeAndOrName FixUpDynamicType(const TypeAndOrName &type_and_or_name, ValueObject &static_value)=0
lldb_private::Status::Fail
bool Fail() const
Test for error condition.
Definition: Status.cpp:181
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void SetAddressByteSize(uint32_t addr_size)
Set the address byte size.
Definition: DataExtractor.h:845
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bool SetData(DataExtractor &data, Status &error) override
Definition: ValueObjectDynamicValue.cpp:303
Type.h
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virtual TypeImpl GetTypeImpl()
Definition: ValueObject.h:355
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Definition: ConstString.h:40
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Definition: ValueObjectDynamicValue.h:113
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Definition: ValueObject.cpp:111
lldb_private::ValueObjectDynamicValue::IsInScope
bool IsInScope() override
Definition: ValueObjectDynamicValue.cpp:267
lldb_private::Value::ValueType
ValueType
Type that describes Value::m_value.
Definition: Value.h:41
lldb::DynamicValueType
DynamicValueType
Definition: lldb-enumerations.h:494
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const ExecutionContextRef & GetExecutionContextRef() const
Definition: ValueObject.h:330
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Definition: LanguageRuntime.h:60
lldb::eLanguageTypeObjC
@ eLanguageTypeObjC
Objective-C.
Definition: lldb-enumerations.h:453
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void SetName(ConstString name)
Change the name of the current ValueObject.
Definition: ValueObject.h:560
ValueObject.h
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uint32_t GetAddressByteSize() const
Returns the size in bytes of an address of the current architecture.
Definition: ArchSpec.cpp:686
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TypeImpl GetTypeImpl() override
Definition: ValueObjectDynamicValue.cpp:59
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Definition: CompilerType.cpp:515
lldb_private::ValueObject::GetValueType
virtual lldb::ValueType GetValueType() const =0
lldb_private::ValueObject::SetValueFromCString
virtual bool SetValueFromCString(const char *value_str, Status &error)
Definition: ValueObject.cpp:1465
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virtual lldb::LanguageType GetPreferredDisplayLanguage()
Definition: ValueObject.cpp:3079
lldb-types.h
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EvaluationPoint m_update_point
Stores both the stop id and the full context at which this value was last updated.
Definition: ValueObject.h:847
lldb_private::ValueObjectDynamicValue::GetDisplayTypeName
ConstString GetDisplayTypeName() override
Definition: ValueObjectDynamicValue.cpp:76
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Definition: ValueObject.cpp:496
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const ArchSpec & GetArchitecture() const
Definition: Target.h:984
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ConstString GetTypeName() override
Definition: ValueObjectDynamicValue.cpp:50
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Definition: Status.h:44
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ValueObject:
Definition: ValueObject.h:105
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ConstString GetName() const
Definition: ValueObject.h:467
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Definition: lldb-enumerations.h:315
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@ eLanguageTypeUnknown
Unknown or invalid language value.
Definition: lldb-enumerations.h:437
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Definition: Address.h:59
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Definition: ValueObject.h:852
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The parent value object, or nullptr if this has no parent.
Definition: ValueObject.h:840
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virtual bool GetDeclaration(Declaration &decl)
Definition: ValueObject.cpp:1550
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lldb::addr_t GetLoadAddress(Target *target) const
Get the load address.
Definition: Address.cpp:311
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Definition: Process.cpp:1509
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Definition: ValueObjectDynamicValue.cpp:338
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Definition: ValueObject.h:352
lldb_private::ValueObjectDynamicValue::IsSyntheticChildrenGenerated
bool IsSyntheticChildrenGenerated() override
Definition: ValueObjectDynamicValue.cpp:354
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Definition: Type.cpp:912
lldb_private::ValueObject::GetModule
virtual lldb::ModuleSP GetModule()
Return the module associated with this value object in case the value is from an executable file and ...
Definition: ValueObject.cpp:3024
DataExtractor.h
lldb_private::CompilerType
Generic representation of a type in a programming language.
Definition: CompilerType.h:33
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bool SetValueFromCString(const char *value_str, Status &error) override
Definition: ValueObjectDynamicValue.cpp:269
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const CompilerType & GetCompilerType()
Definition: Value.cpp:222
LanguageRuntime.h
Status.h
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virtual bool SetData(DataExtractor &data, Status &error)
Definition: ValueObject.cpp:783
lldb_private::ValueObject::GetDisplayTypeName
virtual ConstString GetDisplayTypeName()
Definition: ValueObject.h:367
lldb::eLanguageTypeC
@ eLanguageTypeC
Non-standardized C, such as K&R.
Definition: lldb-enumerations.h:439
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A class that represents a running process on the host machine.
Definition: SBCommandInterpreterRunOptions.h:16
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Definition: Type.h:244
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bool GetDeclaration(Declaration &decl) override
Definition: ValueObjectDynamicValue.cpp:366
lldb_private::TypeAndOrName::HasType
bool HasType() const
Definition: Type.h:427
lldb_private::Status::Clear
void Clear()
Clear the object state.
Definition: Status.cpp:167
lldb_private::ValueObject::GetTargetSP
lldb::TargetSP GetTargetSP() const
Definition: ValueObject.h:334
lldb_private::ValueObjectDynamicValue::m_address
Address m_address
The variable that this value object is based upon.
Definition: ValueObjectDynamicValue.h:110
lldb_private::ValueObject::ClearDynamicTypeInformation
void ClearDynamicTypeInformation()
Definition: ValueObject.cpp:236
lldb_private::Value::GetValueByteSize
uint64_t GetValueByteSize(Status *error_ptr, ExecutionContext *exe_ctx)
Definition: Value.cpp:194
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Definition: Log.h:115
lldb_private::ValueObject::m_error
Status m_error
An error object that can describe any errors that occur when updating values.
Definition: ValueObject.h:855
lldb_private::TypeAndOrName
Sometimes you can find the name of the type corresponding to an object, but we don't have debug infor...
Definition: Type.h:397
lldb_private::GetLog
Log * GetLog(Cat mask)
Retrieve the Log object for the channel associated with the given log enum.
Definition: Log.h:308
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Definition: Declaration.h:24
lldb_private::ValueObject::GetLanguageFlags
virtual uint64_t GetLanguageFlags()
Definition: ValueObject.h:789
lldb_private::ValueObjectDynamicValue::GetValueType
lldb::ValueType GetValueType() const override
Definition: ValueObjectDynamicValue.cpp:106
Value.h
lldb_private::ValueObjectDynamicValue::CalculateNumChildren
size_t CalculateNumChildren(uint32_t max) override
Should only be called by ValueObject::GetNumChildren().
Definition: ValueObjectDynamicValue.cpp:87
LLDBLog.h
lldb_private::ExecutionContext::GetTargetPtr
Target * GetTargetPtr() const
Returns a pointer to the target object.
Definition: ExecutionContext.cpp:198
ExecutionContext.h
UINT64_MAX
#define UINT64_MAX
Definition: lldb-defines.h:23
lldb_private::ValueObject::GetObjectRuntimeLanguage
virtual lldb::LanguageType GetObjectRuntimeLanguage()
Definition: ValueObject.h:373
lldb_private::ValueObject::GetByteSize
virtual llvm::Optional< uint64_t > GetByteSize()=0
lldb_private::ValueObject::SetNeedsUpdate
void SetNeedsUpdate()
Definition: ValueObject.cpp:229
lldb::eLanguageTypeC_plus_plus
@ eLanguageTypeC_plus_plus
ISO C++:1998.
Definition: lldb-enumerations.h:441
lldb_private::ValueObjectDynamicValue::SetLanguageFlags
void SetLanguageFlags(uint64_t flags) override
Definition: ValueObjectDynamicValue.cpp:379