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//===- RTDyldObjectLinkingLayer.h - RTDyld-based jit linking ---*- 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
//
//===----------------------------------------------------------------------===//
//
// Contains the definition for an RTDyld-based, in-process object linking layer.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_EXECUTIONENGINE_ORC_RTDYLDOBJECTLINKINGLAYER_H
#define LLVM_EXECUTIONENGINE_ORC_RTDYLDOBJECTLINKINGLAYER_H
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ExecutionEngine/JITEventListener.h"
#include "llvm/ExecutionEngine/JITSymbol.h"
#include "llvm/ExecutionEngine/Orc/Core.h"
#include "llvm/ExecutionEngine/Orc/Layer.h"
#include "llvm/ExecutionEngine/RuntimeDyld.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Error.h"
#include <algorithm>
#include <cassert>
#include <functional>
#include <list>
#include <memory>
#include <string>
#include <utility>
#include <vector>
namespace llvm {
namespace orc {
class RTDyldObjectLinkingLayer : public ObjectLayer, private ResourceManager {
public:
/// Functor for receiving object-loaded notifications.
using NotifyLoadedFunction = std::function<void(
MaterializationResponsibility &R, const object::ObjectFile &Obj,
const RuntimeDyld::LoadedObjectInfo &)>;
/// Functor for receiving finalization notifications.
using NotifyEmittedFunction = std::function<void(
MaterializationResponsibility &R, std::unique_ptr<MemoryBuffer>)>;
using GetMemoryManagerFunction =
std::function<std::unique_ptr<RuntimeDyld::MemoryManager>()>;
/// Construct an ObjectLinkingLayer with the given NotifyLoaded,
/// and NotifyEmitted functors.
RTDyldObjectLinkingLayer(ExecutionSession &ES,
GetMemoryManagerFunction GetMemoryManager);
~RTDyldObjectLinkingLayer();
/// Emit the object.
void emit(std::unique_ptr<MaterializationResponsibility> R,
std::unique_ptr<MemoryBuffer> O) override;
/// Set the NotifyLoaded callback.
RTDyldObjectLinkingLayer &setNotifyLoaded(NotifyLoadedFunction NotifyLoaded) {
this->NotifyLoaded = std::move(NotifyLoaded);
return *this;
}
/// Set the NotifyEmitted callback.
RTDyldObjectLinkingLayer &
setNotifyEmitted(NotifyEmittedFunction NotifyEmitted) {
this->NotifyEmitted = std::move(NotifyEmitted);
return *this;
}
/// Set the 'ProcessAllSections' flag.
///
/// If set to true, all sections in each object file will be allocated using
/// the memory manager, rather than just the sections required for execution.
///
/// This is kludgy, and may be removed in the future.
RTDyldObjectLinkingLayer &setProcessAllSections(bool ProcessAllSections) {
this->ProcessAllSections = ProcessAllSections;
return *this;
}
/// Instructs this RTDyldLinkingLayer2 instance to override the symbol flags
/// returned by RuntimeDyld for any given object file with the flags supplied
/// by the MaterializationResponsibility instance. This is a workaround to
/// support symbol visibility in COFF, which does not use the libObject's
/// SF_Exported flag. Use only when generating / adding COFF object files.
///
/// FIXME: We should be able to remove this if/when COFF properly tracks
/// exported symbols.
RTDyldObjectLinkingLayer &
setOverrideObjectFlagsWithResponsibilityFlags(bool OverrideObjectFlags) {
this->OverrideObjectFlags = OverrideObjectFlags;
return *this;
}
/// If set, this RTDyldObjectLinkingLayer instance will claim responsibility
/// for any symbols provided by a given object file that were not already in
/// the MaterializationResponsibility instance. Setting this flag allows
/// higher-level program representations (e.g. LLVM IR) to be added based on
/// only a subset of the symbols they provide, without having to write
/// intervening layers to scan and add the additional symbols. This trades
/// diagnostic quality for convenience however: If all symbols are enumerated
/// up-front then clashes can be detected and reported early (and usually
/// deterministically). If this option is set, clashes for the additional
/// symbols may not be detected until late, and detection may depend on
/// the flow of control through JIT'd code. Use with care.
RTDyldObjectLinkingLayer &
setAutoClaimResponsibilityForObjectSymbols(bool AutoClaimObjectSymbols) {
this->AutoClaimObjectSymbols = AutoClaimObjectSymbols;
return *this;
}
/// Register a JITEventListener.
void registerJITEventListener(JITEventListener &L);
/// Unregister a JITEventListener.
void unregisterJITEventListener(JITEventListener &L);
private:
using MemoryManagerUP = std::unique_ptr<RuntimeDyld::MemoryManager>;
Error onObjLoad(MaterializationResponsibility &R,
const object::ObjectFile &Obj,
RuntimeDyld::MemoryManager &MemMgr,
RuntimeDyld::LoadedObjectInfo &LoadedObjInfo,
std::map<StringRef, JITEvaluatedSymbol> Resolved,
std::set<StringRef> &InternalSymbols);
void onObjEmit(MaterializationResponsibility &R,
object::OwningBinary<object::ObjectFile> O,
std::unique_ptr<RuntimeDyld::MemoryManager> MemMgr,
std::unique_ptr<RuntimeDyld::LoadedObjectInfo> LoadedObjInfo,
Error Err);
Error handleRemoveResources(ResourceKey K) override;
void handleTransferResources(ResourceKey DstKey, ResourceKey SrcKey) override;
mutable std::mutex RTDyldLayerMutex;
GetMemoryManagerFunction GetMemoryManager;
NotifyLoadedFunction NotifyLoaded;
NotifyEmittedFunction NotifyEmitted;
bool ProcessAllSections = false;
bool OverrideObjectFlags = false;
bool AutoClaimObjectSymbols = false;
DenseMap<ResourceKey, std::vector<MemoryManagerUP>> MemMgrs;
std::vector<JITEventListener *> EventListeners;
};
} // end namespace orc
} // end namespace llvm
#endif // LLVM_EXECUTIONENGINE_ORC_RTDYLDOBJECTLINKINGLAYER_H
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