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//===--- OrcLazyJIT.h - Basic Orc-based JIT for lazy execution --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Simple Orc-based JIT. Uses the compile-on-demand layer to break up and
// lazily compile modules.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TOOLS_LLI_ORCLAZYJIT_H
#define LLVM_TOOLS_LLI_ORCLAZYJIT_H
#include "llvm/ADT/Triple.h"
#include "llvm/ExecutionEngine/Orc/CompileOnDemandLayer.h"
#include "llvm/ExecutionEngine/Orc/CompileUtils.h"
#include "llvm/ExecutionEngine/Orc/ExecutionUtils.h"
#include "llvm/ExecutionEngine/Orc/IRCompileLayer.h"
#include "llvm/ExecutionEngine/Orc/IRTransformLayer.h"
#include "llvm/ExecutionEngine/Orc/LazyEmittingLayer.h"
#include "llvm/ExecutionEngine/Orc/ObjectLinkingLayer.h"
#include "llvm/ExecutionEngine/RTDyldMemoryManager.h"
#include "llvm/IR/LLVMContext.h"
namespace llvm {
class OrcLazyJIT {
public:
typedef orc::JITCompileCallbackManagerBase CompileCallbackMgr;
typedef orc::ObjectLinkingLayer<> ObjLayerT;
typedef orc::IRCompileLayer<ObjLayerT> CompileLayerT;
typedef std::function<std::unique_ptr<Module>(std::unique_ptr<Module>)>
TransformFtor;
typedef orc::IRTransformLayer<CompileLayerT, TransformFtor> IRDumpLayerT;
typedef orc::LazyEmittingLayer<IRDumpLayerT> LazyEmitLayerT;
typedef orc::CompileOnDemandLayer<LazyEmitLayerT,
CompileCallbackMgr> CODLayerT;
typedef CODLayerT::ModuleSetHandleT ModuleHandleT;
typedef std::function<
std::unique_ptr<CompileCallbackMgr>(IRDumpLayerT&,
RuntimeDyld::MemoryManager&,
LLVMContext&)>
CallbackManagerBuilder;
static CallbackManagerBuilder createCallbackManagerBuilder(Triple T);
OrcLazyJIT(std::unique_ptr<TargetMachine> TM, LLVMContext &Context,
CallbackManagerBuilder &BuildCallbackMgr)
: TM(std::move(TM)),
Mang(this->TM->getDataLayout()),
ObjectLayer(),
CompileLayer(ObjectLayer, orc::SimpleCompiler(*this->TM)),
IRDumpLayer(CompileLayer, createDebugDumper()),
LazyEmitLayer(IRDumpLayer),
CCMgr(BuildCallbackMgr(IRDumpLayer, CCMgrMemMgr, Context)),
CODLayer(LazyEmitLayer, *CCMgr),
CXXRuntimeOverrides([this](const std::string &S) { return mangle(S); }) {}
~OrcLazyJIT() {
// Run any destructors registered with __cxa_atexit.
CXXRuntimeOverrides.runDestructors();
// Run any IR destructors.
for (auto &DtorRunner : IRStaticDestructorRunners)
DtorRunner.runViaLayer(CODLayer);
}
template <typename PtrTy>
static PtrTy fromTargetAddress(orc::TargetAddress Addr) {
return reinterpret_cast<PtrTy>(static_cast<uintptr_t>(Addr));
}
ModuleHandleT addModule(std::unique_ptr<Module> M) {
// Attach a data-layout if one isn't already present.
if (M->getDataLayout().isDefault())
M->setDataLayout(*TM->getDataLayout());
// Record the static constructors and destructors. We have to do this before
// we hand over ownership of the module to the JIT.
std::vector<std::string> CtorNames, DtorNames;
for (auto Ctor : orc::getConstructors(*M))
CtorNames.push_back(mangle(Ctor.Func->getName()));
for (auto Dtor : orc::getDestructors(*M))
DtorNames.push_back(mangle(Dtor.Func->getName()));
// Symbol resolution order:
// 1) Search the JIT symbols.
// 2) Check for C++ runtime overrides.
// 3) Search the host process (LLI)'s symbol table.
auto Resolver =
orc::createLambdaResolver(
[this](const std::string &Name) {
if (auto Sym = CODLayer.findSymbol(Name, true))
return RuntimeDyld::SymbolInfo(Sym.getAddress(), Sym.getFlags());
if (auto Sym = CXXRuntimeOverrides.searchOverrides(Name))
return Sym;
if (auto Addr = RTDyldMemoryManager::getSymbolAddressInProcess(Name))
return RuntimeDyld::SymbolInfo(Addr, JITSymbolFlags::Exported);
return RuntimeDyld::SymbolInfo(nullptr);
},
[](const std::string &Name) { return RuntimeDyld::SymbolInfo(nullptr); }
);
// Add the module to the JIT.
std::vector<std::unique_ptr<Module>> S;
S.push_back(std::move(M));
auto H = CODLayer.addModuleSet(std::move(S), nullptr, std::move(Resolver));
// Run the static constructors, and save the static destructor runner for
// execution when the JIT is torn down.
orc::CtorDtorRunner<CODLayerT> CtorRunner(std::move(CtorNames), H);
CtorRunner.runViaLayer(CODLayer);
IRStaticDestructorRunners.push_back(
orc::CtorDtorRunner<CODLayerT>(std::move(DtorNames), H));
return H;
}
orc::JITSymbol findSymbol(const std::string &Name) {
return CODLayer.findSymbol(mangle(Name), true);
}
orc::JITSymbol findSymbolIn(ModuleHandleT H, const std::string &Name) {
return CODLayer.findSymbolIn(H, mangle(Name), true);
}
private:
std::string mangle(const std::string &Name) {
std::string MangledName;
{
raw_string_ostream MangledNameStream(MangledName);
Mang.getNameWithPrefix(MangledNameStream, Name);
}
return MangledName;
}
static TransformFtor createDebugDumper();
std::unique_ptr<TargetMachine> TM;
Mangler Mang;
SectionMemoryManager CCMgrMemMgr;
ObjLayerT ObjectLayer;
CompileLayerT CompileLayer;
IRDumpLayerT IRDumpLayer;
LazyEmitLayerT LazyEmitLayer;
std::unique_ptr<CompileCallbackMgr> CCMgr;
CODLayerT CODLayer;
orc::LocalCXXRuntimeOverrides CXXRuntimeOverrides;
std::vector<orc::CtorDtorRunner<CODLayerT>> IRStaticDestructorRunners;
};
int runOrcLazyJIT(std::unique_ptr<Module> M, int ArgC, char* ArgV[]);
} // end namespace llvm
#endif
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