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