1 //===------ OrcLazyJIT.cpp - Basic Orc-based JIT for lazy execution -------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "OrcLazyJIT.h"
11 #include "llvm/ExecutionEngine/Orc/OrcTargetSupport.h"
12 #include "llvm/Support/DynamicLibrary.h"
16 OrcLazyJIT::CallbackManagerBuilder
17 OrcLazyJIT::createCallbackManagerBuilder(Triple T) {
18 switch (T.getArch()) {
19 default: return nullptr;
21 case Triple::x86_64: {
22 typedef orc::JITCompileCallbackManager<CompileLayerT,
23 orc::OrcX86_64> CCMgrT;
24 return [](CompileLayerT &CompileLayer, RuntimeDyld::MemoryManager &MemMgr,
25 LLVMContext &Context) {
26 return make_unique<CCMgrT>(CompileLayer, MemMgr, Context, 0, 64);
32 int llvm::runOrcLazyJIT(std::unique_ptr<Module> M, int ArgC, char* ArgV[]) {
33 // Add the program's symbols into the JIT's search space.
34 if (sys::DynamicLibrary::LoadLibraryPermanently(nullptr)) {
35 errs() << "Error loading program symbols.\n";
39 // Grab a target machine and try to build a factory function for the
40 // target-specific Orc callback manager.
41 auto TM = std::unique_ptr<TargetMachine>(EngineBuilder().selectTarget());
42 auto &Context = getGlobalContext();
43 auto CallbackMgrBuilder =
44 OrcLazyJIT::createCallbackManagerBuilder(Triple(TM->getTargetTriple()));
46 // If we couldn't build the factory function then there must not be a callback
47 // manager for this target. Bail out.
48 if (!CallbackMgrBuilder) {
49 errs() << "No callback manager available for target '"
50 << TM->getTargetTriple() << "'.\n";
54 // Everything looks good. Build the JIT.
55 OrcLazyJIT J(std::move(TM), Context, CallbackMgrBuilder);
57 // Add the module, look up main and run it.
58 auto MainHandle = J.addModule(std::move(M));
59 auto MainSym = J.findSymbolIn(MainHandle, "main");
62 errs() << "Could not find main function.\n";
66 typedef int (*MainFnPtr)(int, char*[]);
67 auto Main = OrcLazyJIT::fromTargetAddress<MainFnPtr>(MainSym.getAddress());
68 return Main(ArgC, ArgV);