Rebased PNaCl localmods in LLVM to 223109

tools/pnacl-bcdis/pnacl-bcdis.cpp

+//===-- pnacl-bcdis.cpp - Disassemble pnacl bitcode -----------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+/// TODO(kschimpf): Add disassembling abbreviations.
+
+#include "llvm/Bitcode/NaCl/NaClReaderWriter.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/PrettyStackTrace.h"
+#include "llvm/Support/Signals.h"
+#include "llvm/Support/ToolOutputFile.h"
+#include "llvm/Support/raw_ostream.h"
+#include <system_error>
+
+namespace {
+
+using namespace llvm;
+
+// The input file to read.
+static cl::opt<std::string>
+  InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
+
+// The output file to generate.
+static cl::opt<std::string>
+OutputFilename("o", cl::desc("Specify output filename"),
+               cl::value_desc("filename"), cl::init("-"));
+
+static cl::opt<bool>
+NoRecords("no-records",
+          cl::desc("Don't include records"),
+          cl::init(false));
+
+static cl::opt<bool>
+NoAssembly("no-assembly",
+           cl::desc("Don't include assembly"),
+           cl::init(false));
+
+// Reads and disassembles the bitcode file. Returns false
+// if successful, true otherwise.
+static bool DisassembleBitcode() {
+  // Open the bitcode file and put into a buffer.
+  ErrorOr<std::unique_ptr<MemoryBuffer>> ErrOrFile =
+      MemoryBuffer::getFileOrSTDIN(InputFilename);
+  if (std::error_code EC = ErrOrFile.getError()) {
+    errs() << "Error reading '" << InputFilename << "': " << EC.message()
+           << "\n";
+    return true;
+  }
+
+  // Create a stream to output the bitcode text to.
+  std::error_code EC;
+  raw_fd_ostream Output(OutputFilename, EC, sys::fs::F_None);
+  if (EC) {
+    errs() << EC.message() << '\n';
+    return true;
+  }
+
+  // Parse the the bitcode file.
+  return NaClObjDump(ErrOrFile.get().release(), Output, NoRecords, NoAssembly);
+}
+
+}
+
+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.
+  cl::ParseCommandLineOptions(argc, argv, "pnacl-bccompress file analyzer\n");
+
+  if (DisassembleBitcode()) return 1;
+  return 0;
+}