llvm-6502/lib/ExecutionEngine/JIT/TargetSelect.cpp

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//===-- TargetSelect.cpp - Target Chooser Code ----------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This just asks the TargetMachineRegistry for the appropriate JIT to use, and
// allows the user to specify a specific one on the commandline with -march=x.
//
//===----------------------------------------------------------------------===//
#include "JIT.h"
#include "llvm/Module.h"
#include "llvm/ModuleProvider.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetMachineRegistry.h"
#include <iostream>
using namespace llvm;
static cl::opt<const TargetMachineRegistry::Entry*, false, TargetNameParser>
MArch("march", cl::desc("Architecture to generate assembly for:"));
/// create - Create an return a new JIT compiler if there is one available
/// for the current target. Otherwise, return null.
///
ExecutionEngine *JIT::create(ModuleProvider *MP, IntrinsicLowering *IL) {
if (MArch == 0) {
std::string Error;
MArch = TargetMachineRegistry::getClosestTargetForJIT(Error);
if (MArch == 0) return 0;
} else if (MArch->JITMatchQualityFn() == 0) {
std::cerr << "WARNING: This target JIT is not designed for the host you are"
<< " running. If bad things happen, please choose a different "
<< "-march switch.\n";
}
// Allocate a target...
TargetMachine *Target = MArch->CtorFn(*MP->getModule(), IL);
assert(Target && "Could not allocate target machine!");
// If the target supports JIT code generation, return a new JIT now.
if (TargetJITInfo *TJ = Target->getJITInfo())
return new JIT(MP, *Target, *TJ);
return 0;
}