SystemInitializerFull.cpp

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//===-- SystemInitializerFull.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 "SystemInitializerFull.h"
#include "lldb/API/SBCommandInterpreter.h"
#include "lldb/API/SBDebugger.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/Progress.h"
#include "lldb/Host/Config.h"
#include "lldb/Host/Host.h"
#include "lldb/Initialization/SystemInitializerCommon.h"
#include "lldb/Interpreter/CommandInterpreter.h"
#include "lldb/Target/ProcessTrace.h"
#include "lldb/Utility/Timer.h"
#include "lldb/Version/Version.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/TargetSelect.h"
 
#if LLDB_ENABLE_PYTHON
#include "lldb/Host/ScriptInterpreterRuntimeLoader.h"
#include "lldb/lldb-enumerations.h"
#endif
 
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wglobal-constructors"
#include "llvm/ExecutionEngine/MCJIT.h"
#pragma clang diagnostic pop
 
#include <string>
 
#define LLDB_PLUGIN(p) LLDB_PLUGIN_DECLARE(p)
#include "Plugins/Plugins.def"
 
using namespace lldb_private;
 
SystemInitializerFull::SystemInitializerFull() : SystemInitializerCommon() {}
SystemInitializerFull::~SystemInitializerFull() = default;
 
llvm::Error SystemInitializerFull::Initialize() {
  llvm::Error error = SystemInitializerCommon::Initialize();
  if (error)
    return error;
 
#if LLDB_ENABLE_PYTHON
  // Map libpython into the process before any code that might reference it
  // runs. This is required by both the static script interpreter (whose
  // Initialize() invokes Python via the LLDB_PLUGIN_INITIALIZE loop below)
  // and the dynamic plugin (whose dlopen needs Python's symbols visible in
  // the process). The loader is once_flag-cached and a no-op when libpython
  // is already in the process (e.g. `import lldb` from Python).
  llvm::Expected<ScriptInterpreterRuntimeLoader &> python_loader =
      ScriptInterpreterRuntimeLoader::Get(lldb::eScriptLanguagePython);
  if (!python_loader)
    return python_loader.takeError();
  if (llvm::Error err = python_loader->Load())
    return err;
#endif
 
  // Initialize LLVM and Clang
  llvm::InitializeAllTargets();
  llvm::InitializeAllAsmPrinters();
  llvm::InitializeAllTargetMCs();
  llvm::InitializeAllDisassemblers();
 
  // Initialize the command line parser in LLVM. This usually isn't necessary
  // as we aren't dealing with command line options here, but otherwise some
  // other code in Clang/LLVM might be tempted to call this function from a
  // different thread later on which won't work (as the function isn't
  // thread-safe).
  const char *arg0 = "lldb";
  llvm::cl::ParseCommandLineOptions(1, &arg0);
 
#define LLDB_PLUGIN(p) LLDB_PLUGIN_INITIALIZE(p);
#include "Plugins/Plugins.def"
 
  // Scan for any system or user LLDB plug-ins.
  PluginManager::Initialize();
 
  // The process settings need to know about installed plug-ins, so the
  // Settings must be initialized AFTER PluginManager::Initialize is called.
  Debugger::SettingsInitialize();
 
  // Use the Debugger's LLDBAssert callback.
  SetLLDBAssertCallback(Debugger::AssertCallback);
 
  // Use the system log to report errors that would otherwise get dropped.
  SetLLDBErrorLog(GetLog(SystemLog::System));
 
  LLDB_LOG(GetLog(SystemLog::System), "{0}", GetVersion());
 
  auto LoadPlugin = [](const lldb::DebuggerSP &debugger_sp,
                       const FileSpec &spec,
                       Status &error) -> llvm::sys::DynamicLibrary {
    llvm::sys::DynamicLibrary dynlib =
        llvm::sys::DynamicLibrary::getPermanentLibrary(spec.GetPath().c_str());
    if (dynlib.isValid()) {
      typedef bool (*LLDBCommandPluginInit)(lldb::SBDebugger debugger);
 
      lldb::SBDebugger debugger_sb(debugger_sp);
      // This calls the bool lldb::PluginInitialize(lldb::SBDebugger debugger)
      // function.
      // TODO: mangle this differently for your system - on OSX, the first
      // underscore needs to be removed and the second one stays
      LLDBCommandPluginInit init_func =
          (LLDBCommandPluginInit)(uintptr_t)dynlib.getAddressOfSymbol(
              "_ZN4lldb16PluginInitializeENS_10SBDebuggerE");
      if (init_func) {
        if (init_func(debugger_sb))
          return dynlib;
        else
          error = Status::FromErrorString(
              "plug-in refused to load "
              "(lldb::PluginInitialize(lldb::SBDebugger) "
              "returned false)");
      } else {
        error = Status::FromErrorString(
            "plug-in is missing the required initialization: "
            "lldb::PluginInitialize(lldb::SBDebugger)");
      }
    } else {
      if (FileSystem::Instance().Exists(spec))
        error = Status::FromErrorString(
            "this file does not represent a loadable dylib");
      else
        error = Status::FromErrorString("no such file");
    }
    return llvm::sys::DynamicLibrary();
  };
 
  Debugger::Initialize(LoadPlugin);
 
  return llvm::Error::success();
}
 
void SystemInitializerFull::Terminate() {
  Debugger::Terminate();
 
  Debugger::SettingsTerminate();
 
  // Terminate plug-ins in core LLDB.
  ProcessTrace::Terminate();
 
  // Terminate and unload and loaded system or user LLDB plug-ins.
  PluginManager::Terminate();
 
#define LLDB_PLUGIN(p) LLDB_PLUGIN_TERMINATE(p);
#include "Plugins/Plugins.def"
 
  // Now shutdown the common parts, in reverse order.
  SystemInitializerCommon::Terminate();
}