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//===------ OrcLazyJIT.cpp - Basic Orc-based JIT for lazy execution -------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "OrcLazyJIT.h"
#include "llvm/ExecutionEngine/Orc/OrcTargetSupport.h"
#include "llvm/Support/DynamicLibrary.h"
using namespace llvm;
OrcLazyJIT::CallbackManagerBuilder
OrcLazyJIT::createCallbackManagerBuilder(Triple T) {
switch (T.getArch()) {
default: return nullptr;
case Triple::x86_64: {
typedef orc::JITCompileCallbackManager<CompileLayerT,
orc::OrcX86_64> CCMgrT;
return [](CompileLayerT &CompileLayer, RuntimeDyld::MemoryManager &MemMgr,
LLVMContext &Context) {
return make_unique<CCMgrT>(CompileLayer, MemMgr, Context, 0, 64);
};
}
}
}
int llvm::runOrcLazyJIT(std::unique_ptr<Module> M, int ArgC, char* ArgV[]) {
// Add the program's symbols into the JIT's search space.
if (sys::DynamicLibrary::LoadLibraryPermanently(nullptr)) {
errs() << "Error loading program symbols.\n";
return 1;
}
// Grab a target machine and try to build a factory function for the
// target-specific Orc callback manager.
auto TM = std::unique_ptr<TargetMachine>(EngineBuilder().selectTarget());
auto &Context = getGlobalContext();
auto CallbackMgrBuilder =
OrcLazyJIT::createCallbackManagerBuilder(Triple(TM->getTargetTriple()));
// If we couldn't build the factory function then there must not be a callback
// manager for this target. Bail out.
if (!CallbackMgrBuilder) {
errs() << "No callback manager available for target '"
<< TM->getTargetTriple() << "'.\n";
return 1;
}
// Everything looks good. Build the JIT.
OrcLazyJIT J(std::move(TM), Context, CallbackMgrBuilder);
// Add the module, look up main and run it.
auto MainHandle = J.addModule(std::move(M));
auto MainSym = J.findSymbolIn(MainHandle, "main");
if (!MainSym) {
errs() << "Could not find main function.\n";
return 1;
}
typedef int (*MainFnPtr)(int, char*[]);
auto Main = OrcLazyJIT::fromTargetAddress<MainFnPtr>(MainSym.getAddress());
return Main(ArgC, ArgV);
}
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