1 //===-- ValueObjectMemory.cpp ---------------------------------*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10
11 #include "lldb/Core/ValueObjectMemory.h"
12
13 // C Includes
14 // C++ Includes
15 // Other libraries and framework includes
16 // Project includes
17 #include "lldb/Core/Module.h"
18 #include "lldb/Core/ValueObjectList.h"
19 #include "lldb/Core/Value.h"
20 #include "lldb/Core/ValueObject.h"
21
22 #include "lldb/Symbol/ObjectFile.h"
23 #include "lldb/Symbol/SymbolContext.h"
24 #include "lldb/Symbol/Type.h"
25 #include "lldb/Symbol/Variable.h"
26
27 #include "lldb/Target/ExecutionContext.h"
28 #include "lldb/Target/Process.h"
29 #include "lldb/Target/RegisterContext.h"
30 #include "lldb/Target/Target.h"
31 #include "lldb/Target/Thread.h"
32
33 using namespace lldb;
34 using namespace lldb_private;
35
36 ValueObjectSP
Create(ExecutionContextScope * exe_scope,const char * name,const Address & address,lldb::TypeSP & type_sp)37 ValueObjectMemory::Create (ExecutionContextScope *exe_scope,
38 const char *name,
39 const Address &address,
40 lldb::TypeSP &type_sp)
41 {
42 return (new ValueObjectMemory (exe_scope, name, address, type_sp))->GetSP();
43 }
44
45 ValueObjectSP
Create(ExecutionContextScope * exe_scope,const char * name,const Address & address,const ClangASTType & ast_type)46 ValueObjectMemory::Create (ExecutionContextScope *exe_scope,
47 const char *name,
48 const Address &address,
49 const ClangASTType &ast_type)
50 {
51 return (new ValueObjectMemory (exe_scope, name, address, ast_type))->GetSP();
52 }
53
ValueObjectMemory(ExecutionContextScope * exe_scope,const char * name,const Address & address,lldb::TypeSP & type_sp)54 ValueObjectMemory::ValueObjectMemory (ExecutionContextScope *exe_scope,
55 const char *name,
56 const Address &address,
57 lldb::TypeSP &type_sp) :
58 ValueObject(exe_scope),
59 m_address (address),
60 m_type_sp(type_sp),
61 m_clang_type()
62 {
63 // Do not attempt to construct one of these objects with no variable!
64 assert (m_type_sp.get() != NULL);
65 SetName (ConstString(name));
66 m_value.SetContext(Value::eContextTypeLLDBType, m_type_sp.get());
67 TargetSP target_sp (GetTargetSP());
68 lldb::addr_t load_address = m_address.GetLoadAddress(target_sp.get());
69 if (load_address != LLDB_INVALID_ADDRESS)
70 {
71 m_value.SetValueType(Value::eValueTypeLoadAddress);
72 m_value.GetScalar() = load_address;
73 }
74 else
75 {
76 lldb::addr_t file_address = m_address.GetFileAddress();
77 if (file_address != LLDB_INVALID_ADDRESS)
78 {
79 m_value.SetValueType(Value::eValueTypeFileAddress);
80 m_value.GetScalar() = file_address;
81 }
82 else
83 {
84 m_value.GetScalar() = m_address.GetOffset();
85 m_value.SetValueType (Value::eValueTypeScalar);
86 }
87 }
88 }
89
ValueObjectMemory(ExecutionContextScope * exe_scope,const char * name,const Address & address,const ClangASTType & ast_type)90 ValueObjectMemory::ValueObjectMemory (ExecutionContextScope *exe_scope,
91 const char *name,
92 const Address &address,
93 const ClangASTType &ast_type) :
94 ValueObject(exe_scope),
95 m_address (address),
96 m_type_sp(),
97 m_clang_type(ast_type)
98 {
99 // Do not attempt to construct one of these objects with no variable!
100 assert (m_clang_type.GetASTContext());
101 assert (m_clang_type.GetOpaqueQualType());
102
103 TargetSP target_sp (GetTargetSP());
104
105 SetName (ConstString(name));
106 // m_value.SetContext(Value::eContextTypeClangType, m_clang_type.GetOpaqueQualType());
107 m_value.SetClangType(m_clang_type);
108 lldb::addr_t load_address = m_address.GetLoadAddress (target_sp.get());
109 if (load_address != LLDB_INVALID_ADDRESS)
110 {
111 m_value.SetValueType(Value::eValueTypeLoadAddress);
112 m_value.GetScalar() = load_address;
113 }
114 else
115 {
116 lldb::addr_t file_address = m_address.GetFileAddress();
117 if (file_address != LLDB_INVALID_ADDRESS)
118 {
119 m_value.SetValueType(Value::eValueTypeFileAddress);
120 m_value.GetScalar() = file_address;
121 }
122 else
123 {
124 m_value.GetScalar() = m_address.GetOffset();
125 m_value.SetValueType (Value::eValueTypeScalar);
126 }
127 }
128 }
129
~ValueObjectMemory()130 ValueObjectMemory::~ValueObjectMemory()
131 {
132 }
133
134 ClangASTType
GetClangTypeImpl()135 ValueObjectMemory::GetClangTypeImpl ()
136 {
137 if (m_type_sp)
138 return m_type_sp->GetClangForwardType();
139 return m_clang_type;
140 }
141
142 ConstString
GetTypeName()143 ValueObjectMemory::GetTypeName()
144 {
145 if (m_type_sp)
146 return m_type_sp->GetName();
147 return m_clang_type.GetConstTypeName();
148 }
149
150 ConstString
GetDisplayTypeName()151 ValueObjectMemory::GetDisplayTypeName()
152 {
153 if (m_type_sp)
154 return m_type_sp->GetClangForwardType().GetDisplayTypeName();
155 return m_clang_type.GetDisplayTypeName();
156 }
157
158 size_t
CalculateNumChildren()159 ValueObjectMemory::CalculateNumChildren()
160 {
161 if (m_type_sp)
162 return m_type_sp->GetNumChildren(true);
163 const bool omit_empty_base_classes = true;
164 return m_clang_type.GetNumChildren (omit_empty_base_classes);
165 }
166
167 uint64_t
GetByteSize()168 ValueObjectMemory::GetByteSize()
169 {
170 if (m_type_sp)
171 return m_type_sp->GetByteSize();
172 return m_clang_type.GetByteSize (nullptr);
173 }
174
175 lldb::ValueType
GetValueType() const176 ValueObjectMemory::GetValueType() const
177 {
178 // RETHINK: Should this be inherited from somewhere?
179 return lldb::eValueTypeVariableGlobal;
180 }
181
182 bool
UpdateValue()183 ValueObjectMemory::UpdateValue ()
184 {
185 SetValueIsValid (false);
186 m_error.Clear();
187
188 ExecutionContext exe_ctx (GetExecutionContextRef());
189
190 Target *target = exe_ctx.GetTargetPtr();
191 if (target)
192 {
193 m_data.SetByteOrder(target->GetArchitecture().GetByteOrder());
194 m_data.SetAddressByteSize(target->GetArchitecture().GetAddressByteSize());
195 }
196
197 Value old_value(m_value);
198 if (m_address.IsValid())
199 {
200 Value::ValueType value_type = m_value.GetValueType();
201
202 switch (value_type)
203 {
204 default:
205 assert(!"Unhandled expression result value kind...");
206 break;
207
208 case Value::eValueTypeScalar:
209 // The variable value is in the Scalar value inside the m_value.
210 // We can point our m_data right to it.
211 m_error = m_value.GetValueAsData (&exe_ctx, m_data, 0, GetModule().get());
212 break;
213
214 case Value::eValueTypeFileAddress:
215 case Value::eValueTypeLoadAddress:
216 case Value::eValueTypeHostAddress:
217 // The DWARF expression result was an address in the inferior
218 // process. If this variable is an aggregate type, we just need
219 // the address as the main value as all child variable objects
220 // will rely upon this location and add an offset and then read
221 // their own values as needed. If this variable is a simple
222 // type, we read all data for it into m_data.
223 // Make sure this type has a value before we try and read it
224
225 // If we have a file address, convert it to a load address if we can.
226 if (value_type == Value::eValueTypeFileAddress && exe_ctx.GetProcessPtr())
227 {
228 lldb::addr_t load_addr = m_address.GetLoadAddress(target);
229 if (load_addr != LLDB_INVALID_ADDRESS)
230 {
231 m_value.SetValueType(Value::eValueTypeLoadAddress);
232 m_value.GetScalar() = load_addr;
233 }
234 }
235
236 if (!CanProvideValue())
237 {
238 // this value object represents an aggregate type whose
239 // children have values, but this object does not. So we
240 // say we are changed if our location has changed.
241 SetValueDidChange (value_type != old_value.GetValueType() || m_value.GetScalar() != old_value.GetScalar());
242 }
243 else
244 {
245 // Copy the Value and set the context to use our Variable
246 // so it can extract read its value into m_data appropriately
247 Value value(m_value);
248 if (m_type_sp)
249 value.SetContext(Value::eContextTypeLLDBType, m_type_sp.get());
250 else
251 {
252 //value.SetContext(Value::eContextTypeClangType, m_clang_type.GetOpaqueQualType());
253 value.SetClangType(m_clang_type);
254 }
255
256 m_error = value.GetValueAsData(&exe_ctx, m_data, 0, GetModule().get());
257 }
258 break;
259 }
260
261 SetValueIsValid (m_error.Success());
262 }
263 return m_error.Success();
264 }
265
266
267
268 bool
IsInScope()269 ValueObjectMemory::IsInScope ()
270 {
271 // FIXME: Maybe try to read the memory address, and if that works, then
272 // we are in scope?
273 return true;
274 }
275
276
277 lldb::ModuleSP
GetModule()278 ValueObjectMemory::GetModule()
279 {
280 return m_address.GetModule();
281 }
282
283
284