--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/llvm-cov/gcov.cpp	Mon Sep 08 22:06:00 2014 +0900
@@ -0,0 +1,153 @@
+//===- gcov.cpp - GCOV compatible LLVM coverage tool ----------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// llvm-cov is a command line tools to analyze and report coverage information.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/SmallString.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Errc.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/GCOV.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/MemoryObject.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/PrettyStackTrace.h"
+#include "llvm/Support/Signals.h"
+#include <system_error>
+using namespace llvm;
+
+void reportCoverage(StringRef SourceFile, StringRef ObjectDir,
+                    const std::string &InputGCNO, const std::string &InputGCDA,
+                    bool DumpGCOV, const GCOVOptions &Options) {
+  SmallString<128> CoverageFileStem(ObjectDir);
+  if (CoverageFileStem.empty()) {
+    // If no directory was specified with -o, look next to the source file.
+    CoverageFileStem = sys::path::parent_path(SourceFile);
+    sys::path::append(CoverageFileStem, sys::path::stem(SourceFile));
+  } else if (sys::fs::is_directory(ObjectDir))
+    // A directory name was given. Use it and the source file name.
+    sys::path::append(CoverageFileStem, sys::path::stem(SourceFile));
+  else
+    // A file was given. Ignore the source file and look next to this file.
+    sys::path::replace_extension(CoverageFileStem, "");
+
+  std::string GCNO = InputGCNO.empty()
+                         ? std::string(CoverageFileStem.str()) + ".gcno"
+                         : InputGCNO;
+  std::string GCDA = InputGCDA.empty()
+                         ? std::string(CoverageFileStem.str()) + ".gcda"
+                         : InputGCDA;
+  GCOVFile GF;
+
+  ErrorOr<std::unique_ptr<MemoryBuffer>> GCNO_Buff =
+      MemoryBuffer::getFileOrSTDIN(GCNO);
+  if (std::error_code EC = GCNO_Buff.getError()) {
+    errs() << GCNO << ": " << EC.message() << "\n";
+    return;
+  }
+  GCOVBuffer GCNO_GB(GCNO_Buff.get().get());
+  if (!GF.readGCNO(GCNO_GB)) {
+    errs() << "Invalid .gcno File!\n";
+    return;
+  }
+
+  ErrorOr<std::unique_ptr<MemoryBuffer>> GCDA_Buff =
+      MemoryBuffer::getFileOrSTDIN(GCDA);
+  if (std::error_code EC = GCDA_Buff.getError()) {
+    if (EC != errc::no_such_file_or_directory) {
+      errs() << GCDA << ": " << EC.message() << "\n";
+      return;
+    }
+    // Clear the filename to make it clear we didn't read anything.
+    GCDA = "-";
+  } else {
+    GCOVBuffer GCDA_GB(GCDA_Buff.get().get());
+    if (!GF.readGCDA(GCDA_GB)) {
+      errs() << "Invalid .gcda File!\n";
+      return;
+    }
+  }
+
+  if (DumpGCOV)
+    GF.dump();
+
+  FileInfo FI(Options);
+  GF.collectLineCounts(FI);
+  FI.print(SourceFile, GCNO, GCDA);
+}
+
+int gcov_main(int argc, const 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.
+
+  cl::list<std::string> SourceFiles(cl::Positional, cl::OneOrMore,
+                                    cl::desc("SOURCEFILE"));
+
+  cl::opt<bool> AllBlocks("a", cl::Grouping, cl::init(false),
+                          cl::desc("Display all basic blocks"));
+  cl::alias AllBlocksA("all-blocks", cl::aliasopt(AllBlocks));
+
+  cl::opt<bool> BranchProb("b", cl::Grouping, cl::init(false),
+                           cl::desc("Display branch probabilities"));
+  cl::alias BranchProbA("branch-probabilities", cl::aliasopt(BranchProb));
+
+  cl::opt<bool> BranchCount("c", cl::Grouping, cl::init(false),
+                            cl::desc("Display branch counts instead "
+                                     "of percentages (requires -b)"));
+  cl::alias BranchCountA("branch-counts", cl::aliasopt(BranchCount));
+
+  cl::opt<bool> LongNames("l", cl::Grouping, cl::init(false),
+                          cl::desc("Prefix filenames with the main file"));
+  cl::alias LongNamesA("long-file-names", cl::aliasopt(LongNames));
+
+  cl::opt<bool> FuncSummary("f", cl::Grouping, cl::init(false),
+                            cl::desc("Show coverage for each function"));
+  cl::alias FuncSummaryA("function-summaries", cl::aliasopt(FuncSummary));
+
+  cl::opt<bool> NoOutput("n", cl::Grouping, cl::init(false),
+                         cl::desc("Do not output any .gcov files"));
+  cl::alias NoOutputA("no-output", cl::aliasopt(NoOutput));
+
+  cl::opt<std::string> ObjectDir(
+      "o", cl::value_desc("DIR|FILE"), cl::init(""),
+      cl::desc("Find objects in DIR or based on FILE's path"));
+  cl::alias ObjectDirA("object-directory", cl::aliasopt(ObjectDir));
+  cl::alias ObjectDirB("object-file", cl::aliasopt(ObjectDir));
+
+  cl::opt<bool> PreservePaths("p", cl::Grouping, cl::init(false),
+                              cl::desc("Preserve path components"));
+  cl::alias PreservePathsA("preserve-paths", cl::aliasopt(PreservePaths));
+
+  cl::opt<bool> UncondBranch("u", cl::Grouping, cl::init(false),
+                             cl::desc("Display unconditional branch info "
+                                      "(requires -b)"));
+  cl::alias UncondBranchA("unconditional-branches", cl::aliasopt(UncondBranch));
+
+  cl::OptionCategory DebugCat("Internal and debugging options");
+  cl::opt<bool> DumpGCOV("dump", cl::init(false), cl::cat(DebugCat),
+                         cl::desc("Dump the gcov file to stderr"));
+  cl::opt<std::string> InputGCNO("gcno", cl::cat(DebugCat), cl::init(""),
+                                 cl::desc("Override inferred gcno file"));
+  cl::opt<std::string> InputGCDA("gcda", cl::cat(DebugCat), cl::init(""),
+                                 cl::desc("Override inferred gcda file"));
+
+  cl::ParseCommandLineOptions(argc, argv, "LLVM code coverage tool\n");
+
+  GCOVOptions Options(AllBlocks, BranchProb, BranchCount, FuncSummary,
+                      PreservePaths, UncondBranch, LongNames, NoOutput);
+
+  for (const auto &SourceFile : SourceFiles)
+    reportCoverage(SourceFile, ObjectDir, InputGCNO, InputGCDA, DumpGCOV,
+                   Options);
+  return 0;
+}