forked from OSchip/llvm-project
96 lines
2.9 KiB
C++
96 lines
2.9 KiB
C++
//===--- LLJITWithObjectCache.cpp - An LLJIT example with an ObjectCache --===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ExecutionEngine/ObjectCache.h"
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#include "llvm/ExecutionEngine/Orc/LLJIT.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/IRBuilder.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Support/InitLLVM.h"
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#include "llvm/Support/TargetSelect.h"
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#include "llvm/Support/raw_ostream.h"
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#include "../ExampleModules.h"
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using namespace llvm;
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using namespace llvm::orc;
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ExitOnError ExitOnErr;
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class MyObjectCache : public ObjectCache {
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public:
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void notifyObjectCompiled(const Module *M,
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MemoryBufferRef ObjBuffer) override {
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CachedObjects[M->getModuleIdentifier()] = MemoryBuffer::getMemBufferCopy(
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ObjBuffer.getBuffer(), ObjBuffer.getBufferIdentifier());
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}
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std::unique_ptr<MemoryBuffer> getObject(const Module *M) override {
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auto I = CachedObjects.find(M->getModuleIdentifier());
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if (I == CachedObjects.end()) {
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dbgs() << "No object for " << M->getModuleIdentifier()
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<< " in cache. Compiling.\n";
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return nullptr;
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}
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dbgs() << "Object for " << M->getModuleIdentifier()
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<< " loaded from cache.\n";
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return MemoryBuffer::getMemBuffer(I->second->getMemBufferRef());
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}
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private:
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StringMap<std::unique_ptr<MemoryBuffer>> CachedObjects;
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};
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void runJITWithCache(ObjectCache &ObjCache) {
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// Create an LLJIT instance with a custom IRCompiler.
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auto J = ExitOnErr(
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LLJITBuilder()
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.setCompileFunctionCreator(
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[&](JITTargetMachineBuilder JTMB)
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-> Expected<std::unique_ptr<IRCompileLayer::IRCompiler>> {
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auto TM = JTMB.createTargetMachine();
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if (!TM)
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return TM.takeError();
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return std::make_unique<TMOwningSimpleCompiler>(std::move(*TM),
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&ObjCache);
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})
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.create());
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auto M = ExitOnErr(parseExampleModule(Add1Example, "add1"));
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ExitOnErr(J->addIRModule(std::move(M)));
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// Look up the JIT'd function, cast it to a function pointer, then call it.
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auto Add1Sym = ExitOnErr(J->lookup("add1"));
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int (*Add1)(int) = (int (*)(int))Add1Sym.getAddress();
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int Result = Add1(42);
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outs() << "add1(42) = " << Result << "\n";
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}
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int main(int argc, char *argv[]) {
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// Initialize LLVM.
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InitLLVM X(argc, argv);
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InitializeNativeTarget();
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InitializeNativeTargetAsmPrinter();
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cl::ParseCommandLineOptions(argc, argv, "LLJITWithObjectCache");
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ExitOnErr.setBanner(std::string(argv[0]) + ": ");
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MyObjectCache MyCache;
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runJITWithCache(MyCache);
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runJITWithCache(MyCache);
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return 0;
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}
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