1 files changed, 137 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Support/TargetRegistry.cpp b/contrib/llvm/lib/Support/TargetRegistry.cpp
new file mode 100644
index 0000000..eefef8a
--- /dev/null
+++ b/contrib/llvm/lib/Support/TargetRegistry.cpp
@@ -0,0 +1,137 @@
+//===--- TargetRegistry.cpp - Target registration -------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/raw_ostream.h"
+#include <cassert>
+#include <vector>
+using namespace llvm;
+
+// Clients are responsible for avoid race conditions in registration.
+static Target *FirstTarget = nullptr;
+
+iterator_range<TargetRegistry::iterator> TargetRegistry::targets() {
+  return make_range(iterator(FirstTarget), iterator());
+}
+
+const Target *TargetRegistry::lookupTarget(const std::string &ArchName,
+                                           Triple &TheTriple,
+                                           std::string &Error) {
+  // Allocate target machine.  First, check whether the user has explicitly
+  // specified an architecture to compile for. If so we have to look it up by
+  // name, because it might be a backend that has no mapping to a target triple.
+  const Target *TheTarget = nullptr;
+  if (!ArchName.empty()) {
+    auto I =
+        std::find_if(targets().begin(), targets().end(),
+                     [&](const Target &T) { return ArchName == T.getName(); });
+
+    if (I == targets().end()) {
+      Error = "error: invalid target '" + ArchName + "'.\n";
+      return nullptr;
+    }
+
+    TheTarget = &*I;
+
+    // Adjust the triple to match (if known), otherwise stick with the
+    // given triple.
+    Triple::ArchType Type = Triple::getArchTypeForLLVMName(ArchName);
+    if (Type != Triple::UnknownArch)
+      TheTriple.setArch(Type);
+  } else {
+    // Get the target specific parser.
+    std::string TempError;
+    TheTarget = TargetRegistry::lookupTarget(TheTriple.getTriple(), TempError);
+    if (!TheTarget) {
+      Error = ": error: unable to get target for '"
+            + TheTriple.getTriple()
+            + "', see --version and --triple.\n";
+      return nullptr;
+    }
+  }
+
+  return TheTarget;
+}
+
+const Target *TargetRegistry::lookupTarget(const std::string &TT,
+                                           std::string &Error) {
+  // Provide special warning when no targets are initialized.
+  if (targets().begin() == targets().end()) {
+    Error = "Unable to find target for this triple (no targets are registered)";
+    return nullptr;
+  }
+  Triple::ArchType Arch = Triple(TT).getArch();
+  auto ArchMatch = [&](const Target &T) { return T.ArchMatchFn(Arch); };
+  auto I = std::find_if(targets().begin(), targets().end(), ArchMatch);
+
+  if (I == targets().end()) {
+    Error = "No available targets are compatible with this triple, "
+      "see -version for the available targets.";
+    return nullptr;
+  }
+
+  auto J = std::find_if(std::next(I), targets().end(), ArchMatch);
+  if (J != targets().end()) {
+    Error = std::string("Cannot choose between targets \"") + I->Name +
+            "\" and \"" + J->Name + "\"";
+    return nullptr;
+  }
+
+  return &*I;
+}
+
+void TargetRegistry::RegisterTarget(Target &T,
+                                    const char *Name,
+                                    const char *ShortDesc,
+                                    Target::ArchMatchFnTy ArchMatchFn,
+                                    bool HasJIT) {
+  assert(Name && ShortDesc && ArchMatchFn &&
+         "Missing required target information!");
+
+  // Check if this target has already been initialized, we allow this as a
+  // convenience to some clients.
+  if (T.Name)
+    return;
+         
+  // Add to the list of targets.
+  T.Next = FirstTarget;
+  FirstTarget = &T;
+
+  T.Name = Name;
+  T.ShortDesc = ShortDesc;
+  T.ArchMatchFn = ArchMatchFn;
+  T.HasJIT = HasJIT;
+}
+
+static int TargetArraySortFn(const std::pair<StringRef, const Target *> *LHS,
+                             const std::pair<StringRef, const Target *> *RHS) {
+  return LHS->first.compare(RHS->first);
+}
+
+void TargetRegistry::printRegisteredTargetsForVersion() {
+  std::vector<std::pair<StringRef, const Target*> > Targets;
+  size_t Width = 0;
+  for (const auto &T : TargetRegistry::targets()) {
+    Targets.push_back(std::make_pair(T.getName(), &T));
+    Width = std::max(Width, Targets.back().first.size());
+  }
+  array_pod_sort(Targets.begin(), Targets.end(), TargetArraySortFn);
+
+  raw_ostream &OS = outs();
+  OS << "  Registered Targets:\n";
+  for (unsigned i = 0, e = Targets.size(); i != e; ++i) {
+    OS << "    " << Targets[i].first;
+    OS.indent(Width - Targets[i].first.size()) << " - "
+      << Targets[i].second->getShortDescription() << '\n';
+  }
+  if (Targets.empty())
+    OS << "    (none)\n";
+}