1 //===-- SectionLoadList.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/Target/SectionLoadList.h"
11 
12 // C Includes
13 // C++ Includes
14 // Other libraries and framework includes
15 // Project includes
16 #include "lldb/Core/Log.h"
17 #include "lldb/Core/Module.h"
18 #include "lldb/Core/Section.h"
19 #include "lldb/Core/Stream.h"
20 #include "lldb/Symbol/Block.h"
21 #include "lldb/Symbol/Symbol.h"
22 #include "lldb/Symbol/SymbolContext.h"
23 
24 using namespace lldb;
25 using namespace lldb_private;
26 
27 
28 bool
29 SectionLoadList::IsEmpty() const
30 {
31     Mutex::Locker locker(m_mutex);
32     return m_addr_to_sect.empty();
33 }
34 
35 void
36 SectionLoadList::Clear ()
37 {
38     Mutex::Locker locker(m_mutex);
39     m_addr_to_sect.clear();
40     m_sect_to_addr.clear();
41 }
42 
43 addr_t
44 SectionLoadList::GetSectionLoadAddress (const Section *section) const
45 {
46     // TODO: add support for the same section having multiple load addresses
47     addr_t section_load_addr = LLDB_INVALID_ADDRESS;
48     if (section)
49     {
50         Mutex::Locker locker(m_mutex);
51         sect_to_addr_collection::const_iterator pos = m_sect_to_addr.find (section);
52 
53         if (pos != m_sect_to_addr.end())
54             section_load_addr = pos->second;
55     }
56     return section_load_addr;
57 }
58 
59 bool
60 SectionLoadList::SetSectionLoadAddress (const Section *section, addr_t load_addr, bool warn_multiple)
61 {
62     LogSP log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER | LIBLLDB_LOG_VERBOSE));
63 
64     if (log)
65     {
66         const FileSpec &module_file_spec (section->GetModule()->GetFileSpec());
67         log->Printf ("SectionLoadList::%s (section = %p (%s%s%s.%s), load_addr = 0x%16.16llx)",
68                      __FUNCTION__,
69                      section,
70                      module_file_spec.GetDirectory().AsCString(),
71                      module_file_spec.GetDirectory() ? "/" : "",
72                      module_file_spec.GetFilename().AsCString(),
73                      section->GetName().AsCString(),
74                      load_addr);
75     }
76 
77     if (section->GetByteSize() == 0)
78         return false; // No change
79 
80     // Fill in the section -> load_addr map
81     Mutex::Locker locker(m_mutex);
82     sect_to_addr_collection::iterator sta_pos = m_sect_to_addr.find(section);
83     if (sta_pos != m_sect_to_addr.end())
84     {
85         if (load_addr == sta_pos->second)
86             return false; // No change...
87         else
88             sta_pos->second = load_addr;
89     }
90     else
91         m_sect_to_addr[section] = load_addr;
92 
93     // Fill in the load_addr -> section map
94     addr_to_sect_collection::iterator ats_pos = m_addr_to_sect.find(load_addr);
95     if (ats_pos != m_addr_to_sect.end())
96     {
97         // Some sections are ok to overlap, and for others we should warn. When
98         // we have multiple load addresses that correspond to a section, we will
99         // allways attribute the section to the be last section that claims it
100         // exists at that address. Sometimes it is ok for more that one section
101         // to be loaded at a specific load address, and other times it isn't.
102         // The "warn_multiple" parameter tells us if we should warn in this case
103         // or not. The DynamicLoader plug-in subclasses should know which
104         // sections should warn and which shouldn't (darwin shared cache modules
105         // all shared the same "__LINKEDIT" sections, so the dynamic loader can
106         // pass false for "warn_multiple").
107         if (warn_multiple && section != ats_pos->second)
108         {
109             ModuleSP module_sp (section->GetModule());
110             if (module_sp)
111             {
112                 module_sp->ReportWarning ("address 0x%16.16llx maps to more than one section: %s.%s and %s.%s",
113                                           load_addr,
114                                           module_sp->GetFileSpec().GetFilename().GetCString(),
115                                           section->GetName().GetCString(),
116                                           ats_pos->second->GetModule()->GetFileSpec().GetFilename().GetCString(),
117                                           ats_pos->second->GetName().GetCString());
118             }
119         }
120         ats_pos->second = section;
121     }
122     else
123         m_addr_to_sect[load_addr] = section;
124 
125     return true;    // Changed
126 }
127 
128 size_t
129 SectionLoadList::SetSectionUnloaded (const Section *section)
130 {
131     LogSP log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER | LIBLLDB_LOG_VERBOSE));
132 
133     if (log)
134     {
135         const FileSpec &module_file_spec (section->GetModule()->GetFileSpec());
136         log->Printf ("SectionLoadList::%s (section = %p (%s%s%s.%s))",
137                      __FUNCTION__,
138                      section,
139                      module_file_spec.GetDirectory().AsCString(),
140                      module_file_spec.GetDirectory() ? "/" : "",
141                      module_file_spec.GetFilename().AsCString(),
142                      section->GetName().AsCString());
143     }
144 
145     size_t unload_count = 0;
146     Mutex::Locker locker(m_mutex);
147 
148     sect_to_addr_collection::iterator sta_pos = m_sect_to_addr.find(section);
149     if (sta_pos != m_sect_to_addr.end())
150     {
151         addr_t load_addr = sta_pos->second;
152         m_sect_to_addr.erase (sta_pos);
153 
154         addr_to_sect_collection::iterator ats_pos = m_addr_to_sect.find(load_addr);
155         if (ats_pos != m_addr_to_sect.end())
156             m_addr_to_sect.erase (ats_pos);
157     }
158 
159     return unload_count;
160 }
161 
162 bool
163 SectionLoadList::SetSectionUnloaded (const Section *section, addr_t load_addr)
164 {
165     LogSP log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_DYNAMIC_LOADER | LIBLLDB_LOG_VERBOSE));
166 
167     if (log)
168     {
169         const FileSpec &module_file_spec (section->GetModule()->GetFileSpec());
170         log->Printf ("SectionLoadList::%s (section = %p (%s%s%s.%s), load_addr = 0x%16.16llx)",
171                      __FUNCTION__,
172                      section,
173                      module_file_spec.GetDirectory().AsCString(),
174                      module_file_spec.GetDirectory() ? "/" : "",
175                      module_file_spec.GetFilename().AsCString(),
176                      section->GetName().AsCString(),
177                      load_addr);
178     }
179     bool erased = false;
180     Mutex::Locker locker(m_mutex);
181     sect_to_addr_collection::iterator sta_pos = m_sect_to_addr.find(section);
182     if (sta_pos != m_sect_to_addr.end())
183     {
184         erased = true;
185         m_sect_to_addr.erase (sta_pos);
186     }
187 
188     addr_to_sect_collection::iterator ats_pos = m_addr_to_sect.find(load_addr);
189     if (ats_pos != m_addr_to_sect.end())
190     {
191         erased = true;
192         m_addr_to_sect.erase (ats_pos);
193     }
194 
195     return erased;
196 }
197 
198 
199 bool
200 SectionLoadList::ResolveLoadAddress (addr_t load_addr, Address &so_addr) const
201 {
202     // First find the top level section that this load address exists in
203     Mutex::Locker locker(m_mutex);
204     if (!m_addr_to_sect.empty())
205     {
206         addr_to_sect_collection::const_iterator pos = m_addr_to_sect.lower_bound (load_addr);
207         if (pos != m_addr_to_sect.end())
208         {
209             if (load_addr != pos->first && pos != m_addr_to_sect.begin())
210                 --pos;
211             if (load_addr >= pos->first)
212             {
213                 addr_t offset = load_addr - pos->first;
214                 if (offset < pos->second->GetByteSize())
215                 {
216                     // We have found the top level section, now we need to find the
217                     // deepest child section.
218                     return pos->second->ResolveContainedAddress (offset, so_addr);
219                 }
220             }
221         }
222         else
223         {
224             // There are no entries that have an address that is >= load_addr,
225             // so we need to check the last entry on our collection.
226             addr_to_sect_collection::const_reverse_iterator rpos = m_addr_to_sect.rbegin();
227             if (load_addr >= rpos->first)
228             {
229                 addr_t offset = load_addr - rpos->first;
230                 if (offset < rpos->second->GetByteSize())
231                 {
232                     // We have found the top level section, now we need to find the
233                     // deepest child section.
234                     return rpos->second->ResolveContainedAddress (offset, so_addr);
235                 }
236             }
237         }
238     }
239     so_addr.Clear();
240     return false;
241 }
242 
243 void
244 SectionLoadList::Dump (Stream &s, Target *target)
245 {
246     Mutex::Locker locker(m_mutex);
247     addr_to_sect_collection::const_iterator pos, end;
248     for (pos = m_addr_to_sect.begin(), end = m_addr_to_sect.end(); pos != end; ++pos)
249     {
250         s.Printf("addr = 0x%16.16llx, section = %p: ", pos->first, pos->second);
251         pos->second->Dump (&s, target, 0);
252     }
253 }
254 
255 
256