1 files changed, 261 insertions, 0 deletions
diff --git a/contrib/llvm-project/lldb/source/Symbol/SymbolFile.cpp b/contrib/llvm-project/lldb/source/Symbol/SymbolFile.cpp
new file mode 100644
index 000000000000..16ed98d7840f
--- /dev/null
+++ b/contrib/llvm-project/lldb/source/Symbol/SymbolFile.cpp
@@ -0,0 +1,261 @@
+//===-- SymbolFile.cpp ----------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/Symbol/SymbolFile.h"
+
+#include "lldb/Core/Module.h"
+#include "lldb/Core/PluginManager.h"
+#include "lldb/Symbol/CompileUnit.h"
+#include "lldb/Symbol/ObjectFile.h"
+#include "lldb/Symbol/SymbolFileOnDemand.h"
+#include "lldb/Symbol/TypeMap.h"
+#include "lldb/Symbol/TypeSystem.h"
+#include "lldb/Symbol/VariableList.h"
+#include "lldb/Utility/Log.h"
+#include "lldb/Utility/StreamString.h"
+#include "lldb/Utility/StructuredData.h"
+#include "lldb/lldb-private.h"
+
+#include <future>
+
+using namespace lldb_private;
+using namespace lldb;
+
+char SymbolFile::ID;
+char SymbolFileCommon::ID;
+
+void SymbolFile::PreloadSymbols() {
+  // No-op for most implementations.
+}
+
+std::recursive_mutex &SymbolFile::GetModuleMutex() const {
+  return GetObjectFile()->GetModule()->GetMutex();
+}
+
+SymbolFile *SymbolFile::FindPlugin(ObjectFileSP objfile_sp) {
+  std::unique_ptr<SymbolFile> best_symfile_up;
+  if (objfile_sp != nullptr) {
+
+    // We need to test the abilities of this section list. So create what it
+    // would be with this new objfile_sp.
+    lldb::ModuleSP module_sp(objfile_sp->GetModule());
+    if (module_sp) {
+      // Default to the main module section list.
+      ObjectFile *module_obj_file = module_sp->GetObjectFile();
+      if (module_obj_file != objfile_sp.get()) {
+        // Make sure the main object file's sections are created
+        module_obj_file->GetSectionList();
+        objfile_sp->CreateSections(*module_sp->GetUnifiedSectionList());
+      }
+    }
+
+    // TODO: Load any plug-ins in the appropriate plug-in search paths and
+    // iterate over all of them to find the best one for the job.
+
+    uint32_t best_symfile_abilities = 0;
+
+    SymbolFileCreateInstance create_callback;
+    for (uint32_t idx = 0;
+         (create_callback = PluginManager::GetSymbolFileCreateCallbackAtIndex(
+              idx)) != nullptr;
+         ++idx) {
+      std::unique_ptr<SymbolFile> curr_symfile_up(create_callback(objfile_sp));
+
+      if (curr_symfile_up) {
+        const uint32_t sym_file_abilities = curr_symfile_up->GetAbilities();
+        if (sym_file_abilities > best_symfile_abilities) {
+          best_symfile_abilities = sym_file_abilities;
+          best_symfile_up.reset(curr_symfile_up.release());
+          // If any symbol file parser has all of the abilities, then we should
+          // just stop looking.
+          if ((kAllAbilities & sym_file_abilities) == kAllAbilities)
+            break;
+        }
+      }
+    }
+    if (best_symfile_up) {
+      // If symbol on-demand is enabled the winning symbol file parser is
+      // wrapped with SymbolFileOnDemand so that hydration of the debug info
+      // can be controlled to improve performance.
+      //
+      // Currently the supported on-demand symbol files include:
+      //  executables, shared libraries and debug info files.
+      //
+      // To reduce unnecessary wrapping files with zero debug abilities are
+      // skipped.
+      ObjectFile::Type obj_file_type = objfile_sp->CalculateType();
+      if (ModuleList::GetGlobalModuleListProperties().GetLoadSymbolOnDemand() &&
+          best_symfile_abilities > 0 &&
+          (obj_file_type == ObjectFile::eTypeExecutable ||
+           obj_file_type == ObjectFile::eTypeSharedLibrary ||
+           obj_file_type == ObjectFile::eTypeDebugInfo)) {
+        best_symfile_up =
+            std::make_unique<SymbolFileOnDemand>(std::move(best_symfile_up));
+      }
+      // Let the winning symbol file parser initialize itself more completely
+      // now that it has been chosen
+      best_symfile_up->InitializeObject();
+    }
+  }
+  return best_symfile_up.release();
+}
+
+uint32_t
+SymbolFile::ResolveSymbolContext(const SourceLocationSpec &src_location_spec,
+                                 lldb::SymbolContextItem resolve_scope,
+                                 SymbolContextList &sc_list) {
+  return 0;
+}
+
+void SymbolFile::FindGlobalVariables(ConstString name,
+                                     const CompilerDeclContext &parent_decl_ctx,
+                                     uint32_t max_matches,
+                                     VariableList &variables) {}
+
+void SymbolFile::FindGlobalVariables(const RegularExpression &regex,
+                                     uint32_t max_matches,
+                                     VariableList &variables) {}
+
+void SymbolFile::FindFunctions(const Module::LookupInfo &lookup_info,
+                               const CompilerDeclContext &parent_decl_ctx,
+                               bool include_inlines,
+                               SymbolContextList &sc_list) {}
+
+void SymbolFile::FindFunctions(const RegularExpression &regex,
+                               bool include_inlines,
+                               SymbolContextList &sc_list) {}
+
+void SymbolFile::GetMangledNamesForFunction(
+    const std::string &scope_qualified_name,
+    std::vector<ConstString> &mangled_names) {}
+
+void SymbolFile::AssertModuleLock() {
+  // The code below is too expensive to leave enabled in release builds. It's
+  // enabled in debug builds or when the correct macro is set.
+#if defined(LLDB_CONFIGURATION_DEBUG)
+  // We assert that we have to module lock by trying to acquire the lock from a
+  // different thread. Note that we must abort if the result is true to
+  // guarantee correctness.
+  assert(std::async(
+             std::launch::async,
+             [this] {
+               return this->GetModuleMutex().try_lock();
+             }).get() == false &&
+         "Module is not locked");
+#endif
+}
+
+SymbolFile::RegisterInfoResolver::~RegisterInfoResolver() = default;
+
+Symtab *SymbolFileCommon::GetSymtab() {
+  std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());
+  // Fetch the symtab from the main object file.
+  auto *symtab = GetMainObjectFile()->GetSymtab();
+  if (m_symtab != symtab) {
+    m_symtab = symtab;
+
+    // Then add our symbols to it.
+    if (m_symtab)
+      AddSymbols(*m_symtab);
+  }
+  return m_symtab;
+}
+
+ObjectFile *SymbolFileCommon::GetMainObjectFile() {
+  return m_objfile_sp->GetModule()->GetObjectFile();
+}
+
+void SymbolFileCommon::SectionFileAddressesChanged() {
+  ObjectFile *module_objfile = GetMainObjectFile();
+  ObjectFile *symfile_objfile = GetObjectFile();
+  if (symfile_objfile != module_objfile)
+    symfile_objfile->SectionFileAddressesChanged();
+  if (auto *symtab = GetSymtab())
+    symtab->SectionFileAddressesChanged();
+}
+
+uint32_t SymbolFileCommon::GetNumCompileUnits() {
+  std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());
+  if (!m_compile_units) {
+    // Create an array of compile unit shared pointers -- which will each
+    // remain NULL until someone asks for the actual compile unit information.
+    m_compile_units.emplace(CalculateNumCompileUnits());
+  }
+  return m_compile_units->size();
+}
+
+CompUnitSP SymbolFileCommon::GetCompileUnitAtIndex(uint32_t idx) {
+  std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());
+  uint32_t num = GetNumCompileUnits();
+  if (idx >= num)
+    return nullptr;
+  lldb::CompUnitSP &cu_sp = (*m_compile_units)[idx];
+  if (!cu_sp)
+    cu_sp = ParseCompileUnitAtIndex(idx);
+  return cu_sp;
+}
+
+void SymbolFileCommon::SetCompileUnitAtIndex(uint32_t idx,
+                                             const CompUnitSP &cu_sp) {
+  std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());
+  const size_t num_compile_units = GetNumCompileUnits();
+  assert(idx < num_compile_units);
+  UNUSED_IF_ASSERT_DISABLED(num_compile_units);
+
+  // Fire off an assertion if this compile unit already exists for now. The
+  // partial parsing should take care of only setting the compile unit
+  // once, so if this assertion fails, we need to make sure that we don't
+  // have a race condition, or have a second parse of the same compile
+  // unit.
+  assert((*m_compile_units)[idx] == nullptr);
+  (*m_compile_units)[idx] = cu_sp;
+}
+
+llvm::Expected<TypeSystemSP>
+SymbolFileCommon::GetTypeSystemForLanguage(lldb::LanguageType language) {
+  auto type_system_or_err =
+      m_objfile_sp->GetModule()->GetTypeSystemForLanguage(language);
+  if (type_system_or_err) {
+    if (auto ts = *type_system_or_err)
+      ts->SetSymbolFile(this);
+  }
+  return type_system_or_err;
+}
+
+uint64_t SymbolFileCommon::GetDebugInfoSize(bool load_all_debug_info) {
+  if (!m_objfile_sp)
+    return 0;
+  ModuleSP module_sp(m_objfile_sp->GetModule());
+  if (!module_sp)
+    return 0;
+  const SectionList *section_list = module_sp->GetSectionList();
+  if (section_list)
+    return section_list->GetDebugInfoSize();
+  return 0;
+}
+
+void SymbolFileCommon::Dump(Stream &s) {
+  s.Format("SymbolFile {0} ({1})\n", GetPluginName(),
+           GetMainObjectFile()->GetFileSpec());
+  s.PutCString("Types:\n");
+  m_type_list.Dump(&s, /*show_context*/ false);
+  s.PutChar('\n');
+
+  s.PutCString("Compile units:\n");
+  if (m_compile_units) {
+    for (const CompUnitSP &cu_sp : *m_compile_units) {
+      // We currently only dump the compile units that have been parsed
+      if (cu_sp)
+        cu_sp->Dump(&s, /*show_context*/ false);
+    }
+  }
+  s.PutChar('\n');
+
+  if (Symtab *symtab = GetSymtab())
+    symtab->Dump(&s, nullptr, eSortOrderNone);
+}