Initial FLO commit.

Summary:
Directory created.

(cherry picked from FBD28105260)

bolt/CMakeLists.txt

@@ -0,0 +1,18 @@
+set(LLVM_LINK_COMPONENTS
+  ${LLVM_TARGETS_TO_BUILD}
+  CodeGen
+  Core
+  DebugInfoDWARF
+  MC
+  MCDisassembler
+  MCParser
+  Object
+  Orcjit
+  Support
+  )
+
+add_llvm_tool(llvm-flo
+  llvm-flo.cpp
+  BinaryCFG.cpp
+  BinaryOptimizer.cpp
+  )

bolt/LLVMBuild.txt

@@ -0,0 +1,22 @@
+;===- ./tools/llvm-flo/LLVMBuild.txt ---------------------------*- Conf -*--===;
+;
+;                     The LLVM Compiler Infrastructure
+;
+; This file is distributed under the University of Illinois Open Source
+; License. See LICENSE.TXT for details.
+;
+;===------------------------------------------------------------------------===;
+;
+; This is an LLVMBuild description file for the components in this subdirectory.
+;
+; For more information on the LLVMBuild system, please see:
+;
+;   http://llvm.org/docs/LLVMBuild.html
+;
+;===------------------------------------------------------------------------===;
+
+[component_0]
+type = Tool
+name = llvm-flo
+parent = Tools
+required_libraries = DebugInfoDWARF MC MCDisassembler MCParser Object all-targets

bolt/llvm-flo.cpp

@@ -0,0 +1,112 @@
+//===-- llvm-flo.cpp - Feedback-directed layout optimizer -----------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ExecutionEngine/Orc/LambdaResolver.h"
+#include "llvm/ExecutionEngine/Orc/ObjectLinkingLayer.h"
+#include "llvm/ExecutionEngine/RTDyldMemoryManager.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCDisassembler.h"
+#include "llvm/MC/MCInstPrinter.h"
+#include "llvm/MC/MCInstrAnalysis.h"
+#include "llvm/MC/MCInstrInfo.h"
+#include "llvm/MC/MCObjectFileInfo.h"
+#include "llvm/MC/MCRegisterInfo.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/Object/ELFObjectFile.h"
+#include "llvm/Object/ObjectFile.h"
+#include "llvm/Support/Casting.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/Errc.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/PrettyStackTrace.h"
+#include "llvm/Support/Signals.h"
+#include "llvm/Support/TargetSelect.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Support/ToolOutputFile.h"
+#include "llvm/Target/TargetMachine.h"
+
+
+#include <algorithm>
+#include <map>
+#include <system_error>
+
+using namespace llvm;
+using namespace object;
+
+// Tool options.
+static cl::opt<std::string>
+InputFilename(cl::Positional, cl::desc("<executable>"), cl::Required);
+
+static cl::opt<std::string>
+InputDataFilename("data", cl::desc("<data file>"), cl::Optional);
+
+static cl::opt<std::string>
+OutputFilename("o", cl::desc("<output file>"), cl::Required);
+
+static cl::list<std::string>
+FunctionNames("funcs", cl::desc("list of functions to optimzize"),
+              cl::Optional);
+
+
+static StringRef ToolName;
+
+static void report_error(StringRef Message, std::error_code EC) {
+  assert(EC);
+  errs() << ToolName << ": '" << Message << "': " << EC.message() << ".\n";
+  exit(1);
+}
+
+int main(int argc, char **argv) {
+  // Print a stack trace if we signal out.
+  sys::PrintStackTraceOnErrorSignal();
+  PrettyStackTraceProgram X(argc, argv);
+
+  llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
+
+  // Initialize targets and assembly printers/parsers.
+  llvm::InitializeAllTargetInfos();
+  llvm::InitializeAllTargetMCs();
+  llvm::InitializeAllAsmParsers();
+  llvm::InitializeAllDisassemblers();
+
+  llvm::InitializeAllTargets();
+  llvm::InitializeAllAsmPrinters();
+
+  // Register the target printer for --version.
+  cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
+
+  cl::ParseCommandLineOptions(argc, argv,
+                              "llvm feedback-directed layout optimizer\n");
+
+  ToolName = argv[0];
+
+  if (!sys::fs::exists(InputFilename))
+    report_error(InputFilename, errc::no_such_file_or_directory);
+
+  // Attempt to open the binary.
+  ErrorOr<OwningBinary<Binary>> BinaryOrErr = createBinary(InputFilename);
+  if (std::error_code EC = BinaryOrErr.getError())
+    report_error(InputFilename, EC);
+  Binary &Binary = *BinaryOrErr.get().getBinary();
+
+  if (ELFObjectFileBase *e = dyn_cast<ELFObjectFileBase>(&Binary)) {
+    outs() << "mind blown : " << e << "!\n";
+  } else {
+    report_error(InputFilename, object_error::invalid_file_type);
+  }
+
+  return EXIT_SUCCESS;
+}