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86 lines
3.5 KiB
C++
86 lines
3.5 KiB
C++
//===-- TargetMachineRegistry.cpp - Target Auto Registration Impl ---------===//
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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 file exposes the RegisterTarget class, which TargetMachine
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// implementations should use to register themselves with the system. This file
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// also exposes the TargetMachineRegistry class, which allows tools to inspect
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// all of registered targets.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Target/TargetMachineRegistry.h"
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#include <algorithm>
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using namespace llvm;
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template<> Registry<TargetMachine>::node *Registry<TargetMachine>::Head = 0;
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template<> Registry<TargetMachine>::node *Registry<TargetMachine>::Tail = 0;
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template<> Registry<TargetMachine>::listener *Registry<TargetMachine>::
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ListenerHead = 0;
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template<> Registry<TargetMachine>::listener *Registry<TargetMachine>::
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ListenerTail = 0;
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/// getClosestStaticTargetForModule - Given an LLVM module, pick the best target
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/// that is compatible with the module. If no close target can be found, this
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/// returns null and sets the Error string to a reason.
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const TargetMachineRegistry::entry *
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TargetMachineRegistry::getClosestStaticTargetForModule(const Module &M,
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std::string &Error) {
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std::vector<std::pair<unsigned, const entry *> > UsableTargets;
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for (Registry<TargetMachine>::iterator I = begin(), E = end(); I != E; ++I)
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if (unsigned Qual = I->ModuleMatchQualityFn(M))
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UsableTargets.push_back(std::make_pair(Qual, &*I));
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if (UsableTargets.empty()) {
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Error = "No available targets are compatible with this module";
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return 0;
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} else if (UsableTargets.size() == 1)
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return UsableTargets.back().second;
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// Otherwise, take the best target, but make sure we don't have to equally
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// good best targets.
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std::sort(UsableTargets.begin(), UsableTargets.end());
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if (UsableTargets.back().first ==UsableTargets[UsableTargets.size()-2].first){
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Error = "Cannot choose between targets \"" +
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std::string(UsableTargets.back().second->Name) + "\" and \"" +
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std::string(UsableTargets[UsableTargets.size()-2].second->Name) + "\"";
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return 0;
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}
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return UsableTargets.back().second;
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}
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/// getClosestTargetForJIT - Pick the best target that is compatible with
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/// the current host. If no close target can be found, this returns null
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/// and sets the Error string to a reason.
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const TargetMachineRegistry::entry *
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TargetMachineRegistry::getClosestTargetForJIT(std::string &Error) {
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std::vector<std::pair<unsigned, const entry *> > UsableTargets;
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for (Registry<TargetMachine>::iterator I = begin(), E = end(); I != E; ++I)
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if (unsigned Qual = I->JITMatchQualityFn())
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UsableTargets.push_back(std::make_pair(Qual, &*I));
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if (UsableTargets.empty()) {
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Error = "No JIT is available for this host";
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return 0;
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} else if (UsableTargets.size() == 1)
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return UsableTargets.back().second;
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// Otherwise, take the best target. If there is a tie, just pick one.
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unsigned MaxQual = UsableTargets.front().first;
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const entry *MaxQualTarget = UsableTargets.front().second;
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for (unsigned i = 1, e = UsableTargets.size(); i != e; ++i)
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if (UsableTargets[i].first > MaxQual) {
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MaxQual = UsableTargets[i].first;
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MaxQualTarget = UsableTargets[i].second;
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}
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return MaxQualTarget;
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}
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