LLJITWithObjectCache.cpp
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//===--- LLJITWithObjectCache.cpp - An LLJIT example with an ObjectCache --===//
//
// 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 "llvm/ADT/StringMap.h"
#include "llvm/ExecutionEngine/ObjectCache.h"
#include "llvm/ExecutionEngine/Orc/LLJIT.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/InitLLVM.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/raw_ostream.h"
#include "../ExampleModules.h"
using namespace llvm;
using namespace llvm::orc;
ExitOnError ExitOnErr;
class MyObjectCache : public ObjectCache {
public:
void notifyObjectCompiled(const Module *M,
MemoryBufferRef ObjBuffer) override {
CachedObjects[M->getModuleIdentifier()] = MemoryBuffer::getMemBufferCopy(
ObjBuffer.getBuffer(), ObjBuffer.getBufferIdentifier());
}
std::unique_ptr<MemoryBuffer> getObject(const Module *M) override {
auto I = CachedObjects.find(M->getModuleIdentifier());
if (I == CachedObjects.end()) {
dbgs() << "No object for " << M->getModuleIdentifier()
<< " in cache. Compiling.\n";
return nullptr;
}
dbgs() << "Object for " << M->getModuleIdentifier()
<< " loaded from cache.\n";
return MemoryBuffer::getMemBuffer(I->second->getMemBufferRef());
}
private:
StringMap<std::unique_ptr<MemoryBuffer>> CachedObjects;
};
void runJITWithCache(ObjectCache &ObjCache) {
// Create an LLJIT instance with a custom IRCompiler.
auto J = ExitOnErr(
LLJITBuilder()
.setCompileFunctionCreator(
[&](JITTargetMachineBuilder JTMB)
-> Expected<std::unique_ptr<IRCompileLayer::IRCompiler>> {
auto TM = JTMB.createTargetMachine();
if (!TM)
return TM.takeError();
return std::make_unique<TMOwningSimpleCompiler>(std::move(*TM),
&ObjCache);
})
.create());
auto M = ExitOnErr(parseExampleModule(Add1Example, "add1"));
ExitOnErr(J->addIRModule(std::move(M)));
// Look up the JIT'd function, cast it to a function pointer, then call it.
auto Add1Sym = ExitOnErr(J->lookup("add1"));
int (*Add1)(int) = (int (*)(int))Add1Sym.getAddress();
int Result = Add1(42);
outs() << "add1(42) = " << Result << "\n";
}
int main(int argc, char *argv[]) {
// Initialize LLVM.
InitLLVM X(argc, argv);
InitializeNativeTarget();
InitializeNativeTargetAsmPrinter();
cl::ParseCommandLineOptions(argc, argv, "LLJITWithObjectCache");
ExitOnErr.setBanner(std::string(argv[0]) + ": ");
MyObjectCache MyCache;
runJITWithCache(MyCache);
runJITWithCache(MyCache);
return 0;
}