From cbb70ce070d220642b038ea101d9c0f9fbf860d6 Mon Sep 17 00:00:00 2001
From: dim <dim@FreeBSD.org>
Date: Sun, 20 Feb 2011 12:57:14 +0000
Subject: Vendor import of llvm trunk r126079:
http://llvm.org/svn/llvm-project/llvm/trunk@126079
---
lib/ExecutionEngine/MCJIT/TargetSelect.cpp | 91 ++++++++++++++++++++++++++++++
1 file changed, 91 insertions(+)
create mode 100644 lib/ExecutionEngine/MCJIT/TargetSelect.cpp
(limited to 'lib/ExecutionEngine/MCJIT/TargetSelect.cpp')
diff --git a/lib/ExecutionEngine/MCJIT/TargetSelect.cpp b/lib/ExecutionEngine/MCJIT/TargetSelect.cpp
new file mode 100644
index 0000000..50f6593
--- /dev/null
+++ b/lib/ExecutionEngine/MCJIT/TargetSelect.cpp
@@ -0,0 +1,91 @@
+//===-- 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 JIT to use, and allows
+// the user to specify a specific one on the commandline with -march=x. Clients
+// should initialize targets prior to calling createJIT.
+//
+//===----------------------------------------------------------------------===//
+
+#include "MCJIT.h"
+#include "llvm/Module.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Target/SubtargetFeature.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetRegistry.h"
+using namespace llvm;
+
+/// selectTarget - Pick a target either via -march or by guessing the native
+/// arch. Add any CPU features specified via -mcpu or -mattr.
+TargetMachine *MCJIT::selectTarget(Module *Mod,
+ StringRef MArch,
+ StringRef MCPU,
+ const SmallVectorImpl<std::string>& MAttrs,
+ std::string *ErrorStr) {
+ Triple TheTriple(Mod->getTargetTriple());
+ if (TheTriple.getTriple().empty())
+ TheTriple.setTriple(sys::getHostTriple());
+
+ // 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) {
+ *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
+ // module/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;
+ }
+ }
+
+ if (!TheTarget->hasJIT()) {
+ errs() << "WARNING: This target JIT is not designed for the host you are"
+ << " running. If bad things happen, please choose a different "
+ << "-march switch.\n";
+ }
+
+ // Package up features to be passed to target/subtarget
+ std::string FeaturesStr;
+ if (!MCPU.empty() || !MAttrs.empty()) {
+ SubtargetFeatures Features;
+ Features.setCPU(MCPU);
+ for (unsigned i = 0; i != MAttrs.size(); ++i)
+ Features.AddFeature(MAttrs[i]);
+ FeaturesStr = Features.getString();
+ }
+
+ // Allocate a target...
+ TargetMachine *Target =
+ TheTarget->createTargetMachine(TheTriple.getTriple(), FeaturesStr);
+ assert(Target && "Could not allocate target machine!");
+ return Target;
+}
--
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