forked from OSchip/llvm-project
103 lines
3.6 KiB
C++
103 lines
3.6 KiB
C++
//===-- TargetSelect.cpp - Target Chooser Code ----------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This just asks the TargetRegistry for the appropriate target to use, and
|
|
// allows the user to specify a specific one on the commandline with -march=x,
|
|
// -mcpu=y, and -mattr=a,-b,+c. Clients should initialize targets prior to
|
|
// calling selectTarget().
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/ADT/Triple.h"
|
|
#include "llvm/ExecutionEngine/ExecutionEngine.h"
|
|
#include "llvm/IR/Module.h"
|
|
#include "llvm/MC/SubtargetFeature.h"
|
|
#include "llvm/Support/Host.h"
|
|
#include "llvm/Support/TargetRegistry.h"
|
|
#include "llvm/Target/TargetMachine.h"
|
|
|
|
using namespace llvm;
|
|
|
|
TargetMachine *EngineBuilder::selectTarget() {
|
|
Triple TT;
|
|
|
|
// MCJIT can generate code for remote targets, but the old JIT and Interpreter
|
|
// must use the host architecture.
|
|
if (WhichEngine != EngineKind::Interpreter && M)
|
|
TT.setTriple(M->getTargetTriple());
|
|
|
|
return selectTarget(TT, MArch, MCPU, MAttrs);
|
|
}
|
|
|
|
/// selectTarget - Pick a target either via -march or by guessing the native
|
|
/// arch. Add any CPU features specified via -mcpu or -mattr.
|
|
TargetMachine *EngineBuilder::selectTarget(const Triple &TargetTriple,
|
|
StringRef MArch,
|
|
StringRef MCPU,
|
|
const SmallVectorImpl<std::string>& MAttrs) {
|
|
Triple TheTriple(TargetTriple);
|
|
if (TheTriple.getTriple().empty())
|
|
TheTriple.setTriple(sys::getProcessTriple());
|
|
|
|
// Adjust the triple to match what the user requested.
|
|
const Target *TheTarget = nullptr;
|
|
if (!MArch.empty()) {
|
|
auto I = find_if(TargetRegistry::targets(),
|
|
[&](const Target &T) { return MArch == T.getName(); });
|
|
|
|
if (I == TargetRegistry::targets().end()) {
|
|
if (ErrorStr)
|
|
*ErrorStr = "No available targets are compatible with this -march, "
|
|
"see -version for the available targets.\n";
|
|
return nullptr;
|
|
}
|
|
|
|
TheTarget = &*I;
|
|
|
|
// Adjust the triple to match (if known), otherwise stick with the
|
|
// requested/host triple.
|
|
Triple::ArchType Type = Triple::getArchTypeForLLVMName(MArch);
|
|
if (Type != Triple::UnknownArch)
|
|
TheTriple.setArch(Type);
|
|
} else {
|
|
std::string Error;
|
|
TheTarget = TargetRegistry::lookupTarget(TheTriple.getTriple(), Error);
|
|
if (!TheTarget) {
|
|
if (ErrorStr)
|
|
*ErrorStr = Error;
|
|
return nullptr;
|
|
}
|
|
}
|
|
|
|
// Package up features to be passed to target/subtarget
|
|
std::string FeaturesStr;
|
|
if (!MAttrs.empty()) {
|
|
SubtargetFeatures Features;
|
|
for (unsigned i = 0; i != MAttrs.size(); ++i)
|
|
Features.AddFeature(MAttrs[i]);
|
|
FeaturesStr = Features.getString();
|
|
}
|
|
|
|
// FIXME: non-iOS ARM FastISel is broken with MCJIT.
|
|
if (TheTriple.getArch() == Triple::arm &&
|
|
!TheTriple.isiOS() &&
|
|
OptLevel == CodeGenOpt::None) {
|
|
OptLevel = CodeGenOpt::Less;
|
|
}
|
|
|
|
// Allocate a target...
|
|
TargetMachine *Target = TheTarget->createTargetMachine(TheTriple.getTriple(),
|
|
MCPU, FeaturesStr,
|
|
Options,
|
|
RelocModel, CMModel,
|
|
OptLevel);
|
|
assert(Target && "Could not allocate target machine!");
|
|
return Target;
|
|
}
|