forked from OSchip/llvm-project
107 lines
3.4 KiB
C++
107 lines
3.4 KiB
C++
//===-- TargetSelect.cpp - Target Chooser Code ----------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This just asks the TargetRegistry for the appropriate JIT to use, and allows
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// the user to specify a specific one on the commandline with -march=x. Clients
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// should initialize targets prior to calling createJIT.
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//
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//===----------------------------------------------------------------------===//
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#include "JIT.h"
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#include "llvm/Module.h"
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#include "llvm/ModuleProvider.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/System/Host.h"
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#include "llvm/Target/SubtargetFeature.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetRegistry.h"
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using namespace llvm;
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static cl::opt<std::string>
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MArch("march",
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cl::desc("Architecture to generate assembly for (see --version)"));
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static cl::opt<std::string>
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MCPU("mcpu",
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cl::desc("Target a specific cpu type (-mcpu=help for details)"),
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cl::value_desc("cpu-name"),
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cl::init(""));
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static cl::list<std::string>
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MAttrs("mattr",
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cl::CommaSeparated,
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cl::desc("Target specific attributes (-mattr=help for details)"),
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cl::value_desc("a1,+a2,-a3,..."));
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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 *JIT::selectTarget(ModuleProvider *MP, std::string *ErrorStr) {
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Module &Mod = *MP->getModule();
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Triple TheTriple(Mod.getTargetTriple());
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if (TheTriple.getTriple().empty())
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TheTriple.setTriple(sys::getHostTriple());
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// Adjust the triple to match what the user requested.
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const Target *TheTarget = 0;
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if (!MArch.empty()) {
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for (TargetRegistry::iterator it = TargetRegistry::begin(),
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ie = TargetRegistry::end(); it != ie; ++it) {
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if (MArch == it->getName()) {
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TheTarget = &*it;
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break;
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}
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}
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if (!TheTarget) {
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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 0;
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}
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// Adjust the triple to match (if known), otherwise stick with the
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// module/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 == 0) {
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if (ErrorStr)
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*ErrorStr = Error;
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return 0;
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}
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}
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if (!TheTarget->hasJIT()) {
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errs() << "WARNING: This target JIT is not designed for the host you are"
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<< " running. If bad things happen, please choose a different "
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<< "-march switch.\n";
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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 (!MCPU.empty() || !MAttrs.empty()) {
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SubtargetFeatures Features;
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Features.setCPU(MCPU);
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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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// Allocate a target...
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TargetMachine *Target =
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TheTarget->createTargetMachine(TheTriple.getTriple(), FeaturesStr);
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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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