forked from OSchip/llvm-project
82 lines
2.8 KiB
C++
82 lines
2.8 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 TargetMachineRegistry for the appropriate JIT 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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//
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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/Support/Streams.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/TargetMachineRegistry.h"
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using namespace llvm;
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static cl::opt<const TargetMachineRegistry::entry*, false,
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TargetMachineRegistry::Parser>
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MArch("march", cl::desc("Architecture to generate assembly for:"));
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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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/// createInternal - Create an return a new JIT compiler if there is one
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/// available for the current target. Otherwise, return null.
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///
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ExecutionEngine *JIT::createJIT(ModuleProvider *MP, std::string *ErrorStr,
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JITMemoryManager *JMM, bool Fast) {
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const TargetMachineRegistry::entry *TheArch = MArch;
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if (TheArch == 0) {
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std::string Error;
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TheArch = TargetMachineRegistry::getClosestTargetForJIT(Error);
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if (TheArch == 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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} else if (TheArch->JITMatchQualityFn() == 0) {
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cerr << "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 = TheArch->CtorFn(*MP->getModule(), FeaturesStr);
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assert(Target && "Could not allocate target machine!");
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// If the target supports JIT code generation, return a new JIT now.
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if (TargetJITInfo *TJ = Target->getJITInfo())
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return new JIT(MP, *Target, *TJ, JMM, Fast);
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if (ErrorStr)
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*ErrorStr = "target does not support JIT code generation";
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return 0;
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}
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