ELFDebugObjectPlugin.h

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//===------ ELFDebugObjectPlugin.h - JITLink debug objects ------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// ObjectLinkingLayer plugin for emitting debug objects.
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_EXECUTIONENGINE_ORC_ELFDEBUGOBJECTPLUGIN_H
#define LLVM_EXECUTIONENGINE_ORC_ELFDEBUGOBJECTPLUGIN_H
 
#include "llvm/ExecutionEngine/JITLink/JITLink.h"
#include "llvm/ExecutionEngine/Orc/Core.h"
#include "llvm/ExecutionEngine/Orc/ObjectLinkingLayer.h"
#include "llvm/ExecutionEngine/Orc/Shared/ExecutorAddress.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/Memory.h"
#include "llvm/Support/MemoryBufferRef.h"
#include "llvm/TargetParser/Triple.h"
 
#include <functional>
#include <map>
#include <memory>
#include <mutex>
 
namespace llvm {
namespace orc {
 
class DebugObject;
 
/// Creates and manages DebugObjects for JITLink artifacts.
///
/// DebugObjects are created when linking for a MaterializationResponsibility
/// starts. They are pending as long as materialization is in progress.
///
/// There can only be one pending DebugObject per MaterializationResponsibility.
/// If materialization fails, pending DebugObjects are discarded.
///
/// Once executable code for the MaterializationResponsibility is emitted, the
/// corresponding DebugObject is finalized to target memory and the provided
/// DebugObjectRegistrar is notified. Ownership of DebugObjects remains with the
/// plugin.
///
class LLVM_ABI ELFDebugObjectPlugin : public ObjectLinkingLayer::Plugin {
public:
  /// Create the plugin to submit DebugObjects for JITLink artifacts. For all
  /// options the recommended setting is true.
  ///
  /// RequireDebugSections:
  ///   Submit debug objects to the executor only if they contain actual debug
  ///   info. Turning this off may allow minimal debugging based on raw symbol
  ///   names. Note that this may cause significant memory and transport
  ///   overhead for objects built with a release configuration.
  ///
  /// AutoRegisterCode:
  ///   Notify the debugger for each new debug object. This is a good default
  ///   mode, but it may cause significant overhead when adding many modules in
  ///   sequence. When turning this off, the user has to issue the call to
  ///   __jit_debug_register_code() on the executor side manually.
  ///
  ELFDebugObjectPlugin(ExecutionSession &ES, bool RequireDebugSections,
                       bool AutoRegisterCode, Error &Err);
  ~ELFDebugObjectPlugin() override;
 
  void notifyMaterializing(MaterializationResponsibility &MR,
                           jitlink::LinkGraph &G, jitlink::JITLinkContext &Ctx,
                           MemoryBufferRef InputObject) override;
 
  Error notifyFailed(MaterializationResponsibility &MR) override;
  Error notifyRemovingResources(JITDylib &JD, ResourceKey K) override;
 
  void notifyTransferringResources(JITDylib &JD, ResourceKey DstKey,
                                   ResourceKey SrcKey) override;
 
  void modifyPassConfig(MaterializationResponsibility &MR,
                        jitlink::LinkGraph &LG,
                        jitlink::PassConfiguration &PassConfig) override;
 
private:
  ExecutionSession &ES;
 
  using OwnedDebugObject = std::unique_ptr<DebugObject>;
  std::map<MaterializationResponsibility *, OwnedDebugObject> PendingObjs;
  std::map<ResourceKey, std::vector<OwnedDebugObject>> RegisteredObjs;
 
  std::mutex PendingObjsLock;
  std::mutex RegisteredObjsLock;
 
  ExecutorAddr RegistrationAction;
  bool RequireDebugSections;
  bool AutoRegisterCode;
};
 
} // namespace orc
} // namespace llvm
 
#endif // LLVM_EXECUTIONENGINE_ORC_ELFDEBUGOBJECTPLUGIN_H