contrib/llvm-project/lldb/source/Target/SectionLoadHistory.cpp

   1 //===-- SectionLoadHistory.cpp ----------------------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "lldb/Target/SectionLoadHistory.h"
  10
  11 #include "lldb/Target/SectionLoadList.h"
  12 #include "lldb/Utility/Stream.h"
  13
  14 using namespace lldb;
  15 using namespace lldb_private;
  16
  17 bool SectionLoadHistory::IsEmpty() const {
  18   std::lock_guard<std::recursive_mutex> guard(m_mutex);
  19   return m_stop_id_to_section_load_list.empty();
  20 }
  21
  22 void SectionLoadHistory::Clear() {
  23   std::lock_guard<std::recursive_mutex> guard(m_mutex);
  24   m_stop_id_to_section_load_list.clear();
  25 }
  26
  27 uint32_t SectionLoadHistory::GetLastStopID() const {
  28   std::lock_guard<std::recursive_mutex> guard(m_mutex);
  29   if (m_stop_id_to_section_load_list.empty())
  30     return 0;
  31   else
  32     return m_stop_id_to_section_load_list.rbegin()->first;
  33 }
  34
  35 SectionLoadList *
  36 SectionLoadHistory::GetSectionLoadListForStopID(uint32_t stop_id,
  37                                                 bool read_only) {
  38   if (!m_stop_id_to_section_load_list.empty()) {
  39     if (read_only) {
  40       // The section load list is for reading data only so we don't need to
  41       // create a new SectionLoadList for the current stop ID, just return the
  42       // section load list for the stop ID that is equal to or less than the
  43       // current stop ID
  44       if (stop_id == eStopIDNow) {
  45         // If we are asking for the latest and greatest value, it is always at
  46         // the end of our list because that will be the highest stop ID.
  47         StopIDToSectionLoadList::reverse_iterator rpos =
  48             m_stop_id_to_section_load_list.rbegin();
  49         return rpos->second.get();
  50       } else {
  51         StopIDToSectionLoadList::iterator pos =
  52             m_stop_id_to_section_load_list.lower_bound(stop_id);
  53         if (pos != m_stop_id_to_section_load_list.end() &&
  54             pos->first == stop_id)
  55           return pos->second.get();
  56         else if (pos != m_stop_id_to_section_load_list.begin()) {
  57           --pos;
  58           return pos->second.get();
  59         }
  60       }
  61     } else {
  62       // You can only use "eStopIDNow" when reading from the section load
  63       // history
  64       assert(stop_id != eStopIDNow);
  65
  66       // We are updating the section load list (not read only), so if the stop
  67       // ID passed in isn't the same as the last stop ID in our collection,
  68       // then create a new node using the current stop ID
  69       StopIDToSectionLoadList::iterator pos =
  70           m_stop_id_to_section_load_list.lower_bound(stop_id);
  71       if (pos != m_stop_id_to_section_load_list.end() &&
  72           pos->first == stop_id) {
  73         // We already have an entry for this value
  74         return pos->second.get();
  75       }
  76
  77       // We must make a new section load list that is based on the last valid
  78       // section load list, so here we copy the last section load list and add
  79       // a new node for the current stop ID.
  80       StopIDToSectionLoadList::reverse_iterator rpos =
  81           m_stop_id_to_section_load_list.rbegin();
  82       SectionLoadListSP section_load_list_sp(
  83           new SectionLoadList(*rpos->second));
  84       m_stop_id_to_section_load_list[stop_id] = section_load_list_sp;
  85       return section_load_list_sp.get();
  86     }
  87   }
  88   SectionLoadListSP section_load_list_sp(new SectionLoadList());
  89   if (stop_id == eStopIDNow)
  90     stop_id = 0;
  91   m_stop_id_to_section_load_list[stop_id] = section_load_list_sp;
  92   return section_load_list_sp.get();
  93 }
  94
  95 SectionLoadList &SectionLoadHistory::GetCurrentSectionLoadList() {
  96   const bool read_only = true;
  97   std::lock_guard<std::recursive_mutex> guard(m_mutex);
  98   SectionLoadList *section_load_list =
  99       GetSectionLoadListForStopID(eStopIDNow, read_only);
 100   assert(section_load_list != nullptr);
 101   return *section_load_list;
 102 }
 103
 104 addr_t
 105 SectionLoadHistory::GetSectionLoadAddress(uint32_t stop_id,
 106                                           const lldb::SectionSP &section_sp) {
 107   std::lock_guard<std::recursive_mutex> guard(m_mutex);
 108   const bool read_only = true;
 109   SectionLoadList *section_load_list =
 110       GetSectionLoadListForStopID(stop_id, read_only);
 111   return section_load_list->GetSectionLoadAddress(section_sp);
 112 }
 113
 114 bool SectionLoadHistory::ResolveLoadAddress(uint32_t stop_id, addr_t load_addr,
 115                                             Address &so_addr) {
 116   // First find the top level section that this load address exists in
 117   std::lock_guard<std::recursive_mutex> guard(m_mutex);
 118   const bool read_only = true;
 119   SectionLoadList *section_load_list =
 120       GetSectionLoadListForStopID(stop_id, read_only);
 121   return section_load_list->ResolveLoadAddress(load_addr, so_addr);
 122 }
 123
 124 bool SectionLoadHistory::SetSectionLoadAddress(
 125     uint32_t stop_id, const lldb::SectionSP &section_sp, addr_t load_addr,
 126     bool warn_multiple) {
 127   std::lock_guard<std::recursive_mutex> guard(m_mutex);
 128   const bool read_only = false;
 129   SectionLoadList *section_load_list =
 130       GetSectionLoadListForStopID(stop_id, read_only);
 131   return section_load_list->SetSectionLoadAddress(section_sp, load_addr,
 132                                                   warn_multiple);
 133 }
 134
 135 size_t
 136 SectionLoadHistory::SetSectionUnloaded(uint32_t stop_id,
 137                                        const lldb::SectionSP &section_sp) {
 138   std::lock_guard<std::recursive_mutex> guard(m_mutex);
 139   const bool read_only = false;
 140   SectionLoadList *section_load_list =
 141       GetSectionLoadListForStopID(stop_id, read_only);
 142   return section_load_list->SetSectionUnloaded(section_sp);
 143 }
 144
 145 bool SectionLoadHistory::SetSectionUnloaded(uint32_t stop_id,
 146                                             const lldb::SectionSP &section_sp,
 147                                             addr_t load_addr) {
 148   std::lock_guard<std::recursive_mutex> guard(m_mutex);
 149   const bool read_only = false;
 150   SectionLoadList *section_load_list =
 151       GetSectionLoadListForStopID(stop_id, read_only);
 152   return section_load_list->SetSectionUnloaded(section_sp, load_addr);
 153 }
 154
 155 void SectionLoadHistory::Dump(Stream &s, Target *target) {
 156   std::lock_guard<std::recursive_mutex> guard(m_mutex);
 157   StopIDToSectionLoadList::iterator pos,
 158       end = m_stop_id_to_section_load_list.end();
 159   for (pos = m_stop_id_to_section_load_list.begin(); pos != end; ++pos) {
 160     s.Printf("StopID = %u:\n", pos->first);
 161     pos->second->Dump(s, target);
 162     s.EOL();
 163   }
 164 }