--- /dev/null
+//===--- 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 CompileFunction.
+ auto J = ExitOnErr(
+ LLJITBuilder()
+ .setCompileFunctionCreator(
+ [&](JITTargetMachineBuilder JTMB)
+ -> Expected<IRCompileLayer::CompileFunction> {
+ auto TM = JTMB.createTargetMachine();
+ if (!TM)
+ return TM.takeError();
+ return IRCompileLayer::CompileFunction(
+ 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, "HowToUseLLJIT");
+ ExitOnErr.setBanner(std::string(argv[0]) + ": ");
+
+ MyObjectCache MyCache;
+
+ runJITWithCache(MyCache);
+ runJITWithCache(MyCache);
+
+ return 0;
+}