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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
104 lines
3.6 KiB
C++
104 lines
3.6 KiB
C++
//===-- TargetSelect.cpp - Target Chooser Code ----------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This just asks the TargetRegistry for the appropriate target to use, and
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// allows the user to specify a specific one on the commandline with -march=x,
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// -mcpu=y, and -mattr=a,-b,+c. Clients should initialize targets prior to
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// calling selectTarget().
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/Triple.h"
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#include "llvm/ExecutionEngine/ExecutionEngine.h"
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#include "llvm/IR/Module.h"
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#include "llvm/MC/SubtargetFeature.h"
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#include "llvm/Support/Host.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Target/TargetMachine.h"
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using namespace llvm;
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TargetMachine *EngineBuilder::selectTarget() {
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Triple TT;
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// MCJIT can generate code for remote targets, but the old JIT and Interpreter
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// must use the host architecture.
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if (WhichEngine != EngineKind::Interpreter && M)
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TT.setTriple(M->getTargetTriple());
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return selectTarget(TT, MArch, MCPU, MAttrs);
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}
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/// selectTarget - Pick a target either via -march or by guessing the native
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/// arch. Add any CPU features specified via -mcpu or -mattr.
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TargetMachine *EngineBuilder::selectTarget(const Triple &TargetTriple,
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StringRef MArch,
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StringRef MCPU,
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const SmallVectorImpl<std::string>& MAttrs) {
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Triple TheTriple(TargetTriple);
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if (TheTriple.getTriple().empty())
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TheTriple.setTriple(sys::getProcessTriple());
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// Adjust the triple to match what the user requested.
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const Target *TheTarget = nullptr;
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if (!MArch.empty()) {
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auto I = find_if(TargetRegistry::targets(),
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[&](const Target &T) { return MArch == T.getName(); });
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if (I == TargetRegistry::targets().end()) {
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if (ErrorStr)
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*ErrorStr = "No available targets are compatible with this -march, "
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"see -version for the available targets.\n";
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return nullptr;
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}
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TheTarget = &*I;
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// Adjust the triple to match (if known), otherwise stick with the
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// requested/host triple.
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Triple::ArchType Type = Triple::getArchTypeForLLVMName(MArch);
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if (Type != Triple::UnknownArch)
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TheTriple.setArch(Type);
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} else {
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std::string Error;
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TheTarget = TargetRegistry::lookupTarget(TheTriple.getTriple(), Error);
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if (!TheTarget) {
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if (ErrorStr)
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*ErrorStr = Error;
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return nullptr;
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}
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}
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// Package up features to be passed to target/subtarget
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std::string FeaturesStr;
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if (!MAttrs.empty()) {
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SubtargetFeatures Features;
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for (unsigned i = 0; i != MAttrs.size(); ++i)
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Features.AddFeature(MAttrs[i]);
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FeaturesStr = Features.getString();
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}
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// FIXME: non-iOS ARM FastISel is broken with MCJIT.
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if (TheTriple.getArch() == Triple::arm &&
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!TheTriple.isiOS() &&
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OptLevel == CodeGenOpt::None) {
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OptLevel = CodeGenOpt::Less;
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}
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// Allocate a target...
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TargetMachine *Target =
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TheTarget->createTargetMachine(TheTriple.getTriple(), MCPU, FeaturesStr,
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Options, RelocModel, CMModel, OptLevel,
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/*JIT*/ true);
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Target->Options.EmulatedTLS = EmulatedTLS;
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Target->Options.ExplicitEmulatedTLS = true;
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assert(Target && "Could not allocate target machine!");
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return Target;
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}
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