lldb/source/Symbol/SymbolVendor.cpp

   1 //===-- SymbolVendor.cpp --------------------------------------------------===//
   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/Symbol/SymbolVendor.h"
  10
  11 #include "lldb/Core/Module.h"
  12 #include "lldb/Core/PluginManager.h"
  13 #include "lldb/Symbol/CompileUnit.h"
  14 #include "lldb/Symbol/ObjectFile.h"
  15 #include "lldb/Symbol/SymbolFile.h"
  16 #include "lldb/Utility/Stream.h"
  17
  18 using namespace lldb;
  19 using namespace lldb_private;
  20
  21 // FindPlugin
  22 //
  23 // Platforms can register a callback to use when creating symbol vendors to
  24 // allow for complex debug information file setups, and to also allow for
  25 // finding separate debug information files.
  26 SymbolVendor *SymbolVendor::FindPlugin(const lldb::ModuleSP &module_sp,
  27                                        lldb_private::Stream *feedback_strm) {
  28   std::unique_ptr<SymbolVendor> instance_up;
  29   SymbolVendorCreateInstance create_callback;
  30
  31   for (size_t idx = 0;
  32        (create_callback = PluginManager::GetSymbolVendorCreateCallbackAtIndex(
  33             idx)) != nullptr;
  34        ++idx) {
  35     instance_up.reset(create_callback(module_sp, feedback_strm));
  36
  37     if (instance_up) {
  38       return instance_up.release();
  39     }
  40   }
  41   // The default implementation just tries to create debug information using
  42   // the file representation for the module.
  43   ObjectFileSP sym_objfile_sp;
  44   FileSpec sym_spec = module_sp->GetSymbolFileFileSpec();
  45   if (sym_spec && sym_spec != module_sp->GetObjectFile()->GetFileSpec()) {
  46     DataBufferSP data_sp;
  47     offset_t data_offset = 0;
  48     sym_objfile_sp = ObjectFile::FindPlugin(
  49         module_sp, &sym_spec, 0, FileSystem::Instance().GetByteSize(sym_spec),
  50         data_sp, data_offset);
  51   }
  52   if (!sym_objfile_sp)
  53     sym_objfile_sp = module_sp->GetObjectFile()->shared_from_this();
  54   instance_up = std::make_unique<SymbolVendor>(module_sp);
  55   instance_up->AddSymbolFileRepresentation(sym_objfile_sp);
  56   return instance_up.release();
  57 }
  58
  59 // SymbolVendor constructor
  60 SymbolVendor::SymbolVendor(const lldb::ModuleSP &module_sp)
  61     : ModuleChild(module_sp), m_sym_file_up() {}
  62
  63 // Add a representation given an object file.
  64 void SymbolVendor::AddSymbolFileRepresentation(const ObjectFileSP &objfile_sp) {
  65   ModuleSP module_sp(GetModule());
  66   if (module_sp) {
  67     std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex());
  68     if (objfile_sp)
  69       m_sym_file_up.reset(SymbolFile::FindPlugin(objfile_sp));
  70   }
  71 }