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