contrib/llvm/tools/lldb/source/Target/SectionLoadHistory.cpp

   1 //===-- SectionLoadHistory.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/SectionLoadHistory.h"
  11
  12 // C Includes
  13 // C++ Includes
  14 // Other libraries and framework includes
  15 // Project includes
  16 #include "lldb/Core/Stream.h"
  17 #include "lldb/Target/SectionLoadList.h"
  18
  19 using namespace lldb;
  20 using namespace lldb_private;
  21
  22
  23 bool
  24 SectionLoadHistory::IsEmpty() const
  25 {
  26     Mutex::Locker locker(m_mutex);
  27     return m_stop_id_to_section_load_list.empty();
  28 }
  29
  30 void
  31 SectionLoadHistory::Clear ()
  32 {
  33     Mutex::Locker locker(m_mutex);
  34     m_stop_id_to_section_load_list.clear();
  35 }
  36
  37 uint32_t
  38 SectionLoadHistory::GetLastStopID() const
  39 {
  40     Mutex::Locker locker(m_mutex);
  41     if (m_stop_id_to_section_load_list.empty())
  42         return 0;
  43     else
  44         return m_stop_id_to_section_load_list.rbegin()->first;
  45 }
  46
  47 SectionLoadList *
  48 SectionLoadHistory::GetSectionLoadListForStopID (uint32_t stop_id, bool read_only)
  49 {
  50     if (m_stop_id_to_section_load_list.empty())
  51     {
  52         SectionLoadListSP section_load_list_sp(new SectionLoadList());
  53         if (stop_id == eStopIDNow)
  54             stop_id = 0;
  55         m_stop_id_to_section_load_list[stop_id] = section_load_list_sp;
  56         return section_load_list_sp.get();
  57     }
  58     else
  59     {
  60         if (read_only)
  61         {
  62             // The section load list is for reading data only so we don't need to create
  63             // a new SectionLoadList for the current stop ID, just return the section
  64             // load list for the stop ID that is equal to or less than the current stop ID
  65             if (stop_id == eStopIDNow)
  66             {
  67                 // If we are asking for the latest and greatest value, it is always
  68                 // at the end of our list becuase that will be the highest stop ID.
  69                 StopIDToSectionLoadList::reverse_iterator rpos = m_stop_id_to_section_load_list.rbegin();
  70                 return rpos->second.get();
  71             }
  72             else
  73             {
  74                 StopIDToSectionLoadList::iterator pos = m_stop_id_to_section_load_list.lower_bound(stop_id);
  75                 if (pos != m_stop_id_to_section_load_list.end() && pos->first == stop_id)
  76                     return pos->second.get();
  77                 else if (pos != m_stop_id_to_section_load_list.begin())
  78                 {
  79                     --pos;
  80                     return pos->second.get();
  81                 }
  82             }
  83         }
  84         else
  85         {
  86             // You can only use "eStopIDNow" when reading from the section load history
  87             assert(stop_id != eStopIDNow);
  88
  89             // We are updating the section load list (not read only), so if the stop ID
  90             // passed in isn't the same as the last stop ID in our collection, then create
  91             // a new node using the current stop ID
  92             StopIDToSectionLoadList::iterator pos = m_stop_id_to_section_load_list.lower_bound(stop_id);
  93             if (pos != m_stop_id_to_section_load_list.end() && pos->first == stop_id)
  94             {
  95                 // We already have an entry for this value
  96                 return pos->second.get();
  97             }
  98
  99             // We must make a new section load list that is based on the last valid
 100             // section load list, so here we copy the last section load list and add
 101             // a new node for the current stop ID.
 102             StopIDToSectionLoadList::reverse_iterator rpos = m_stop_id_to_section_load_list.rbegin();
 103             SectionLoadListSP section_load_list_sp(new SectionLoadList(*rpos->second.get()));
 104             m_stop_id_to_section_load_list[stop_id] = section_load_list_sp;
 105             return section_load_list_sp.get();
 106         }
 107     }
 108     return NULL;
 109 }
 110
 111 SectionLoadList &
 112 SectionLoadHistory::GetCurrentSectionLoadList ()
 113 {
 114     const bool read_only = true;
 115     SectionLoadList *section_load_list = GetSectionLoadListForStopID (eStopIDNow, read_only);
 116     assert(section_load_list != NULL);
 117     return *section_load_list;
 118 }
 119
 120 addr_t
 121 SectionLoadHistory::GetSectionLoadAddress (uint32_t stop_id, const lldb::SectionSP &section_sp)
 122 {
 123     Mutex::Locker locker(m_mutex);
 124     const bool read_only = true;
 125     SectionLoadList *section_load_list = GetSectionLoadListForStopID (stop_id, read_only);
 126     return section_load_list->GetSectionLoadAddress(section_sp);
 127 }
 128
 129 bool
 130 SectionLoadHistory::ResolveLoadAddress (uint32_t stop_id, addr_t load_addr, Address &so_addr)
 131 {
 132     // First find the top level section that this load address exists in
 133     Mutex::Locker locker(m_mutex);
 134     const bool read_only = true;
 135     SectionLoadList *section_load_list = GetSectionLoadListForStopID (stop_id, read_only);
 136     return section_load_list->ResolveLoadAddress (load_addr, so_addr);
 137 }
 138
 139 bool
 140 SectionLoadHistory::SetSectionLoadAddress (uint32_t stop_id,
 141                                            const lldb::SectionSP &section_sp,
 142                                            addr_t load_addr,
 143                                            bool warn_multiple)
 144 {
 145     Mutex::Locker locker(m_mutex);
 146     const bool read_only = false;
 147     SectionLoadList *section_load_list = GetSectionLoadListForStopID (stop_id, read_only);
 148     return section_load_list->SetSectionLoadAddress(section_sp, load_addr, warn_multiple);
 149 }
 150
 151 size_t
 152 SectionLoadHistory::SetSectionUnloaded (uint32_t stop_id, const lldb::SectionSP &section_sp)
 153 {
 154     Mutex::Locker locker(m_mutex);
 155     const bool read_only = false;
 156     SectionLoadList *section_load_list = GetSectionLoadListForStopID (stop_id, read_only);
 157     return section_load_list->SetSectionUnloaded (section_sp);
 158 }
 159
 160 bool
 161 SectionLoadHistory::SetSectionUnloaded (uint32_t stop_id, const lldb::SectionSP &section_sp, addr_t load_addr)
 162 {
 163     Mutex::Locker locker(m_mutex);
 164     const bool read_only = false;
 165     SectionLoadList *section_load_list = GetSectionLoadListForStopID (stop_id, read_only);
 166     return section_load_list->SetSectionUnloaded (section_sp, load_addr);
 167 }
 168
 169 void
 170 SectionLoadHistory::Dump (Stream &s, Target *target)
 171 {
 172     Mutex::Locker locker(m_mutex);
 173     StopIDToSectionLoadList::iterator pos, end = m_stop_id_to_section_load_list.end();
 174     for (pos = m_stop_id_to_section_load_list.begin(); pos != end; ++pos)
 175     {
 176         s.Printf("StopID = %u:\n", pos->first);
 177         pos->second->Dump(s, target);
 178         s.EOL();
 179     }
 180 }
 181
 182