X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FSupport%2FTargetRegistry.cpp;h=f6918835f74bed5833cfb1edfc3a09c9bd696069;hb=499e74c3cd21f77f72d45a56e25024685c9b7764;hp=4558d2d2159dfcc968da6168a0da407bf6fb0496;hpb=a5881e3060aee9f82aef3747a97650e5eafe893a;p=oota-llvm.git

diff --git a/lib/Support/TargetRegistry.cpp b/lib/Support/TargetRegistry.cpp
index 4558d2d2159..f6918835f74 100644
--- a/lib/Support/TargetRegistry.cpp
+++ b/lib/Support/TargetRegistry.cpp
@@ -7,76 +7,98 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/Module.h"
-#include "llvm/Target/TargetRegistry.h"
-#include "llvm/System/Host.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Host.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 = 0;
+static Target *FirstTarget = nullptr;
 
 TargetRegistry::iterator TargetRegistry::begin() {
   return iterator(FirstTarget);
 }
 
+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()) {
+    for (TargetRegistry::iterator it = TargetRegistry::begin(),
+           ie = TargetRegistry::end(); it != ie; ++it) {
+      if (ArchName == it->getName()) {
+        TheTarget = &*it;
+        break;
+      }
+    }
+
+    if (!TheTarget) {
+      Error = "error: invalid target '" + ArchName + "'.\n";
+      return nullptr;
+    }
+
+    // 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,
-                                           bool FallbackToHost,
-                                           bool RequireJIT,
                                            std::string &Error) {
   // Provide special warning when no targets are initialized.
   if (begin() == end()) {
     Error = "Unable to find target for this triple (no targets are registered)";
-    return 0;
+    return nullptr;
   }
-  const Target *Best = 0, *EquallyBest = 0;
-  unsigned BestQuality = 0;
+  const Target *Matching = nullptr;
+  Triple::ArchType Arch =  Triple(TT).getArch();
   for (iterator it = begin(), ie = end(); it != ie; ++it) {
-    if (RequireJIT && !it->hasJIT())
-      continue;
-
-    if (unsigned Qual = it->TripleMatchQualityFn(TT)) {
-      if (!Best || Qual > BestQuality) {
-        Best = &*it;
-        EquallyBest = 0;
-        BestQuality = Qual;
-      } else if (Qual == BestQuality)
-        EquallyBest = &*it;
+    if (it->ArchMatchFn(Arch)) {
+      if (Matching) {
+        Error = std::string("Cannot choose between targets \"") +
+          Matching->Name  + "\" and \"" + it->Name + "\"";
+        return nullptr;
+      }
+      Matching = &*it;
     }
   }
 
-  // FIXME: Hack. If we only have an extremely weak match and the client
-  // requested to fall back to the host, then ignore it and try again.
-  if (BestQuality == 1 && FallbackToHost)
-    Best = 0;
-
-  // Fallback to the host triple if we didn't find anything.
-  if (!Best && FallbackToHost)
-    return lookupTarget(sys::getHostTriple(), false, RequireJIT, Error);
-
-  if (!Best) {
-    Error = "No available targets are compatible with this triple";
-    return 0;
+  if (!Matching) {
+    Error = "No available targets are compatible with this triple, "
+      "see -version for the available targets.";
+    return nullptr;
   }
 
-  // Otherwise, take the best target, but make sure we don't have two equally
-  // good best targets.
-  if (EquallyBest) {
-    Error = std::string("Cannot choose between targets \"") +
-      Best->Name  + "\" and \"" + EquallyBest->Name + "\"";
-    return 0;
-  }
-
-  return Best;
+  return Matching;
 }
 
 void TargetRegistry::RegisterTarget(Target &T,
                                     const char *Name,
                                     const char *ShortDesc,
-                                    Target::TripleMatchQualityFnTy TQualityFn,
-                                    Target::ModuleMatchQualityFnTy MQualityFn,
+                                    Target::ArchMatchFnTy ArchMatchFn,
                                     bool HasJIT) {
-  assert(Name && ShortDesc && TQualityFn && MQualityFn &&
+  assert(Name && ShortDesc && ArchMatchFn &&
          "Missing required target information!");
 
   // Check if this target has already been initialized, we allow this as a
@@ -90,8 +112,33 @@ void TargetRegistry::RegisterTarget(Target &T,
 
   T.Name = Name;
   T.ShortDesc = ShortDesc;
-  T.TripleMatchQualityFn = TQualityFn;
-  T.ModuleMatchQualityFn = MQualityFn;
+  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 (TargetRegistry::iterator I = TargetRegistry::begin(),
+       E = TargetRegistry::end();
+       I != E; ++I) {
+    Targets.push_back(std::make_pair(I->getName(), &*I));
+    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";
+}