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
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
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 
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 (name);
66     m_value.SetContext(Value::eContextTypeLLDBType, m_type_sp.get());
67     lldb::addr_t load_address = m_address.GetLoadAddress(m_update_point.GetTarget());
68     if (load_address != LLDB_INVALID_ADDRESS)
69     {
70         m_value.SetValueType(Value::eValueTypeLoadAddress);
71         m_value.GetScalar() = load_address;
72     }
73     else
74     {
75         lldb::addr_t file_address = m_address.GetFileAddress();
76         if (file_address != LLDB_INVALID_ADDRESS)
77         {
78             m_value.SetValueType(Value::eValueTypeFileAddress);
79             m_value.GetScalar() = file_address;
80         }
81         else
82         {
83             m_value.GetScalar() = m_address.GetOffset();
84             m_value.SetValueType (Value::eValueTypeScalar);
85         }
86     }
87 }
88 
89 ValueObjectMemory::ValueObjectMemory (ExecutionContextScope *exe_scope,
90                                       const char *name,
91                                       const Address &address,
92                                       const ClangASTType &ast_type) :
93     ValueObject(exe_scope),
94     m_address (address),
95     m_type_sp(),
96     m_clang_type(ast_type)
97 {
98     // Do not attempt to construct one of these objects with no variable!
99     assert (m_clang_type.GetASTContext());
100     assert (m_clang_type.GetOpaqueQualType());
101 
102     SetName (name);
103     m_value.SetContext(Value::eContextTypeClangType, m_clang_type.GetOpaqueQualType());
104     lldb::addr_t load_address = m_address.GetLoadAddress(m_update_point.GetTarget());
105     if (load_address != LLDB_INVALID_ADDRESS)
106     {
107         m_value.SetValueType(Value::eValueTypeLoadAddress);
108         m_value.GetScalar() = load_address;
109     }
110     else
111     {
112         lldb::addr_t file_address = m_address.GetFileAddress();
113         if (file_address != LLDB_INVALID_ADDRESS)
114         {
115             m_value.SetValueType(Value::eValueTypeFileAddress);
116             m_value.GetScalar() = file_address;
117         }
118         else
119         {
120             m_value.GetScalar() = m_address.GetOffset();
121             m_value.SetValueType (Value::eValueTypeScalar);
122         }
123     }
124 }
125 
126 ValueObjectMemory::~ValueObjectMemory()
127 {
128 }
129 
130 lldb::clang_type_t
131 ValueObjectMemory::GetClangType ()
132 {
133     if (m_type_sp)
134         return m_type_sp->GetClangForwardType();
135     return m_clang_type.GetOpaqueQualType();
136 }
137 
138 ConstString
139 ValueObjectMemory::GetTypeName()
140 {
141     if (m_type_sp)
142         return m_type_sp->GetName();
143     ConstString name;
144     std::string type_name (ClangASTContext::GetTypeName (m_clang_type.GetOpaqueQualType()));
145     if (!type_name.empty())
146         name.SetCString (type_name.c_str());
147     return name;
148 }
149 
150 uint32_t
151 ValueObjectMemory::CalculateNumChildren()
152 {
153     if (m_type_sp)
154         return m_type_sp->GetNumChildren(true);
155     const bool omit_empty_base_classes = true;
156     return ClangASTContext::GetNumChildren (m_clang_type.GetASTContext(),
157                                             m_clang_type.GetOpaqueQualType(),
158                                             omit_empty_base_classes);
159 }
160 
161 clang::ASTContext *
162 ValueObjectMemory::GetClangAST ()
163 {
164     if (m_type_sp)
165         return m_type_sp->GetClangAST();
166     return m_clang_type.GetASTContext();
167 }
168 
169 size_t
170 ValueObjectMemory::GetByteSize()
171 {
172     if (m_type_sp)
173         return m_type_sp->GetByteSize();
174     return (m_clang_type.GetClangTypeBitWidth () + 7) / 8;
175 }
176 
177 lldb::ValueType
178 ValueObjectMemory::GetValueType() const
179 {
180     // RETHINK: Should this be inherited from somewhere?
181     return lldb::eValueTypeVariableGlobal;
182 }
183 
184 bool
185 ValueObjectMemory::UpdateValue ()
186 {
187     SetValueIsValid (false);
188     m_error.Clear();
189 
190     ExecutionContext exe_ctx (GetExecutionContextScope());
191 
192     if (exe_ctx.target)
193     {
194         m_data.SetByteOrder(exe_ctx.target->GetArchitecture().GetByteOrder());
195         m_data.SetAddressByteSize(exe_ctx.target->GetArchitecture().GetAddressByteSize());
196     }
197 
198     Value old_value(m_value);
199     if (m_address.IsValid())
200     {
201         Value::ValueType value_type = m_value.GetValueType();
202 
203         switch (value_type)
204         {
205         default:
206             assert(!"Unhandled expression result value kind...");
207             break;
208 
209         case Value::eValueTypeScalar:
210             // The variable value is in the Scalar value inside the m_value.
211             // We can point our m_data right to it.
212             m_error = m_value.GetValueAsData (&exe_ctx, GetClangAST(), m_data, 0);
213             break;
214 
215         case Value::eValueTypeFileAddress:
216         case Value::eValueTypeLoadAddress:
217         case Value::eValueTypeHostAddress:
218             // The DWARF expression result was an address in the inferior
219             // process. If this variable is an aggregate type, we just need
220             // the address as the main value as all child variable objects
221             // will rely upon this location and add an offset and then read
222             // their own values as needed. If this variable is a simple
223             // type, we read all data for it into m_data.
224             // Make sure this type has a value before we try and read it
225 
226             // If we have a file address, convert it to a load address if we can.
227             if (value_type == Value::eValueTypeFileAddress && exe_ctx.process)
228             {
229                 lldb::addr_t load_addr = m_address.GetLoadAddress(exe_ctx.target);
230                 if (load_addr != LLDB_INVALID_ADDRESS)
231                 {
232                     m_value.SetValueType(Value::eValueTypeLoadAddress);
233                     m_value.GetScalar() = load_addr;
234                 }
235             }
236 
237             if (ClangASTContext::IsAggregateType (GetClangType()))
238             {
239                 // this value object represents an aggregate type whose
240                 // children have values, but this object does not. So we
241                 // say we are changed if our location has changed.
242                 SetValueDidChange (value_type != old_value.GetValueType() || m_value.GetScalar() != old_value.GetScalar());
243             }
244             else
245             {
246                 // Copy the Value and set the context to use our Variable
247                 // so it can extract read its value into m_data appropriately
248                 Value value(m_value);
249                 if (m_type_sp)
250                     value.SetContext(Value::eContextTypeLLDBType, m_type_sp.get());
251                 else
252                     value.SetContext(Value::eContextTypeClangType, m_clang_type.GetOpaqueQualType());
253 
254                 m_error = value.GetValueAsData(&exe_ctx, GetClangAST(), m_data, 0);
255             }
256             break;
257         }
258 
259         SetValueIsValid (m_error.Success());
260     }
261     return m_error.Success();
262 }
263 
264 
265 
266 bool
267 ValueObjectMemory::IsInScope ()
268 {
269     // FIXME: Maybe try to read the memory address, and if that works, then
270     // we are in scope?
271     return true;
272 }
273 
274