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ace8fa5233
The header file was already properly located. The previous need for it in Support had to do with the version string printing which was fixed in r135757. Also update build dependencies where libraries that needed the functionality of the Target library (in the form of the TargetRegistry) were picking it up via Support. This is pretty pervasive, essentially every TargetInfo library (ARMInfo, etc) uses TargetRegistry, making it depend on Target. All of these were previously just sneaking by. llvm-svn: 135760
123 lines
3.8 KiB
C++
123 lines
3.8 KiB
C++
//===--- TargetRegistry.cpp - Target registration -------------------------===//
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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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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Target/TargetRegistry.h"
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#include "llvm/Support/Host.h"
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#include "llvm/Support/raw_ostream.h"
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#include <cassert>
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#include <vector>
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using namespace llvm;
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// Clients are responsible for avoid race conditions in registration.
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static Target *FirstTarget = 0;
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TargetRegistry::iterator TargetRegistry::begin() {
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return iterator(FirstTarget);
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}
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const Target *TargetRegistry::lookupTarget(const std::string &TT,
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std::string &Error) {
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// Provide special warning when no targets are initialized.
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if (begin() == end()) {
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Error = "Unable to find target for this triple (no targets are registered)";
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return 0;
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}
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const Target *Best = 0, *EquallyBest = 0;
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unsigned BestQuality = 0;
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for (iterator it = begin(), ie = end(); it != ie; ++it) {
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if (unsigned Qual = it->TripleMatchQualityFn(TT)) {
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if (!Best || Qual > BestQuality) {
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Best = &*it;
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EquallyBest = 0;
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BestQuality = Qual;
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} else if (Qual == BestQuality)
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EquallyBest = &*it;
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}
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}
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if (!Best) {
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Error = "No available targets are compatible with this triple, "
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"see -version for the available targets.";
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return 0;
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}
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// Otherwise, take the best target, but make sure we don't have two equally
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// good best targets.
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if (EquallyBest) {
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Error = std::string("Cannot choose between targets \"") +
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Best->Name + "\" and \"" + EquallyBest->Name + "\"";
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return 0;
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}
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return Best;
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}
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void TargetRegistry::RegisterTarget(Target &T,
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const char *Name,
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const char *ShortDesc,
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Target::TripleMatchQualityFnTy TQualityFn,
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bool HasJIT) {
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assert(Name && ShortDesc && TQualityFn &&
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"Missing required target information!");
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// Check if this target has already been initialized, we allow this as a
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// convenience to some clients.
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if (T.Name)
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return;
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// Add to the list of targets.
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T.Next = FirstTarget;
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FirstTarget = &T;
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T.Name = Name;
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T.ShortDesc = ShortDesc;
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T.TripleMatchQualityFn = TQualityFn;
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T.HasJIT = HasJIT;
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}
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const Target *TargetRegistry::getClosestTargetForJIT(std::string &Error) {
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const Target *TheTarget = lookupTarget(sys::getHostTriple(), Error);
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if (TheTarget && !TheTarget->hasJIT()) {
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Error = "No JIT compatible target available for this host";
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return 0;
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}
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return TheTarget;
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}
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static int TargetArraySortFn(const void *LHS, const void *RHS) {
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typedef std::pair<StringRef, const Target*> pair_ty;
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return ((const pair_ty*)LHS)->first.compare(((const pair_ty*)RHS)->first);
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}
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void TargetRegistry::printRegisteredTargetsForVersion() {
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std::vector<std::pair<StringRef, const Target*> > Targets;
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size_t Width = 0;
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for (TargetRegistry::iterator I = TargetRegistry::begin(),
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E = TargetRegistry::end();
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I != E; ++I) {
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Targets.push_back(std::make_pair(I->getName(), &*I));
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Width = std::max(Width, Targets.back().first.size());
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}
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array_pod_sort(Targets.begin(), Targets.end(), TargetArraySortFn);
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raw_ostream &OS = outs();
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OS << " Registered Targets:\n";
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for (unsigned i = 0, e = Targets.size(); i != e; ++i) {
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OS << " " << Targets[i].first;
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OS.indent(Width - Targets[i].first.size()) << " - "
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<< Targets[i].second->getShortDescription() << '\n';
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}
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if (Targets.empty())
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OS << " (none)\n";
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}
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