1 files changed, 99 insertions, 0 deletions
diff --git a/contrib/llvm/lib/ExecutionEngine/TargetSelect.cpp b/contrib/llvm/lib/ExecutionEngine/TargetSelect.cpp
new file mode 100644
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--- /dev/null
+++ b/contrib/llvm/lib/ExecutionEngine/TargetSelect.cpp
@@ -0,0 +1,99 @@
+//===-- TargetSelect.cpp - Target Chooser Code ----------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This just asks the TargetRegistry for the appropriate target to use, and
+// allows the user to specify a specific one on the commandline with -march=x,
+// -mcpu=y, and -mattr=a,-b,+c. Clients should initialize targets prior to
+// calling selectTarget().
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ExecutionEngine/ExecutionEngine.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/IR/Module.h"
+#include "llvm/MC/SubtargetFeature.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Target/TargetMachine.h"
+
+using namespace llvm;
+
+TargetMachine *EngineBuilder::selectTarget() {
+  Triple TT;
+
+  // MCJIT can generate code for remote targets, but the old JIT and Interpreter
+  // must use the host architecture.
+  if (UseMCJIT && WhichEngine != EngineKind::Interpreter && M)
+    TT.setTriple(M->getTargetTriple());
+
+  return selectTarget(TT, MArch, MCPU, MAttrs);
+}
+
+/// selectTarget - Pick a target either via -march or by guessing the native
+/// arch.  Add any CPU features specified via -mcpu or -mattr.
+TargetMachine *EngineBuilder::selectTarget(const Triple &TargetTriple,
+                              StringRef MArch,
+                              StringRef MCPU,
+                              const SmallVectorImpl<std::string>& MAttrs) {
+  Triple TheTriple(TargetTriple);
+  if (TheTriple.getTriple().empty())
+    TheTriple.setTriple(sys::getProcessTriple());
+
+  // Adjust the triple to match what the user requested.
+  const Target *TheTarget = 0;
+  if (!MArch.empty()) {
+    for (TargetRegistry::iterator it = TargetRegistry::begin(),
+           ie = TargetRegistry::end(); it != ie; ++it) {
+      if (MArch == it->getName()) {
+        TheTarget = &*it;
+        break;
+      }
+    }
+
+    if (!TheTarget) {
+      if (ErrorStr)
+        *ErrorStr = "No available targets are compatible with this -march, "
+                    "see -version for the available targets.\n";
+      return 0;
+    }
+
+    // Adjust the triple to match (if known), otherwise stick with the
+    // requested/host triple.
+    Triple::ArchType Type = Triple::getArchTypeForLLVMName(MArch);
+    if (Type != Triple::UnknownArch)
+      TheTriple.setArch(Type);
+  } else {
+    std::string Error;
+    TheTarget = TargetRegistry::lookupTarget(TheTriple.getTriple(), Error);
+    if (TheTarget == 0) {
+      if (ErrorStr)
+        *ErrorStr = Error;
+      return 0;
+    }
+  }
+
+  // Package up features to be passed to target/subtarget
+  std::string FeaturesStr;
+  if (!MAttrs.empty()) {
+    SubtargetFeatures Features;
+    for (unsigned i = 0; i != MAttrs.size(); ++i)
+      Features.AddFeature(MAttrs[i]);
+    FeaturesStr = Features.getString();
+  }
+
+  // Allocate a target...
+  TargetMachine *Target = TheTarget->createTargetMachine(TheTriple.getTriple(),
+                                                         MCPU, FeaturesStr,
+                                                         Options,
+                                                         RelocModel, CMModel,
+                                                         OptLevel);
+  assert(Target && "Could not allocate target machine!");
+  return Target;
+}