ExecutionEngine* createExecutionEngine(Module* mod) {
if (globalExecEngine == 0)
{
//we first have to initialize the native target for code generation
const bool initFailed = InitializeNativeTarget();
if (initFailed) {
errs() << "ERROR: could not initialize native target (required for "
<< "LLVM execution engine)\n";
return NULL;
}
std::string errorMessage = "";
EngineBuilder eb = EngineBuilder(mod);
eb.setEngineKind(EngineKind::JIT);
eb.setErrorStr(&errorMessage);
eb.setJITMemoryManager(JITMemoryManager::CreateDefaultMemManager());
eb.setOptLevel(CodeGenOpt::Aggressive);
eb.setAllocateGVsWithCode(false);
eb.setCodeModel(CodeModel::Default);
//eb.setMArch("x86-64");
//eb.setMCPU("corei7");
//std::vector<std::string> attrs;
//attrs.push_back("+sse41");
//eb.setMAttrs(attrs);
globalExecEngine = eb.create();
if (errorMessage != "") {
errs() << "ERROR: could not create execution engine for module "
<< mod->getModuleIdentifier() << ": " << errorMessage << "\n";
return NULL;
}
if (!globalExecEngine) {
errs() << "ERROR: could not create execution engine for module "
<< mod->getModuleIdentifier() << "!\n";
return NULL;
}
}
return globalExecEngine;
}
int main(int argc, char**argv) {
InitializeNativeTarget();
InitializeNativeTargetAsmPrinter();
Module* Mod = makeLLVMModule();
verifyModule(*Mod, PrintMessageAction);
PassManager PM;
PM.add(createPrintModulePass(&outs()));
PM.run(*Mod);
//ExecutionEngine *exe=::llvm::Interpreter::create(Mod);
//ExecutionEngine *exe = EngineBuilder(Mod).create();
//printf("----%p\n",exe);
EngineBuilder eb = EngineBuilder(Mod);
#if LLVM_VERSION >= 33
eb.setEngineKind(EngineKind::JIT);
eb.setJITMemoryManager(JITMemoryManager::CreateDefaultMemManager());
eb.setAllocateGVsWithCode(false);
eb.setOptLevel(CodeGenOpt::Aggressive);
eb.setCodeModel(CodeModel::JITDefault);
#endif
eb.setMArch("x86-64");
eb.setMCPU("corei7-avx");
eb.setUseMCJIT(true);
ExecutionEngine *exe = eb.create();
std::vector<GenericValue> args;
GenericValue GVArgc;
GVArgc.IntVal = APInt(32, 24);
args.push_back(GVArgc);
//printf("xxxx:%p,%p\n",func_factorial,(void*)(&exe->runFunction));
GenericValue ret=exe->runFunction(func_factorial, args);
printf("ret=%llu\n",ret.IntVal.getZExtValue());
#if LLVM_VERSION < 33
exe->freeMachineCodeForFunction(func_factorial);
#endif
delete exe;
//llvm_shutdown();
return 0;
}