1 files changed, 143 insertions, 0 deletions
diff --git a/tools/llvm-dis/llvm-dis.cpp b/tools/llvm-dis/llvm-dis.cpp
new file mode 100644
index 0000000000000..471e5e2f5d2c8
--- /dev/null
+++ b/tools/llvm-dis/llvm-dis.cpp
@@ -0,0 +1,143 @@
+//===-- llvm-dis.cpp - The low-level LLVM disassembler --------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This utility may be invoked in the following manner:
+//  llvm-dis [options]      - Read LLVM bitcode from stdin, write asm to stdout
+//  llvm-dis [options] x.bc - Read LLVM bitcode from the x.bc file, write asm
+//                            to the x.ll file.
+//  Options:
+//      --help   - Output information about command line switches
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Module.h"
+#include "llvm/PassManager.h"
+#include "llvm/Bitcode/ReaderWriter.h"
+#include "llvm/Assembly/PrintModulePass.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/PrettyStackTrace.h"
+#include "llvm/Support/Streams.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/System/Signals.h"
+#include <iostream>
+#include <fstream>
+#include <memory>
+using namespace llvm;
+
+static cl::opt<std::string>
+InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
+
+static cl::opt<std::string>
+OutputFilename("o", cl::desc("Override output filename"),
+               cl::value_desc("filename"));
+
+static cl::opt<bool>
+Force("f", cl::desc("Overwrite output files"));
+
+static cl::opt<bool>
+DontPrint("disable-output", cl::desc("Don't output the .ll file"), cl::Hidden);
+
+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.
+  try {
+    cl::ParseCommandLineOptions(argc, argv, "llvm .bc -> .ll disassembler\n");
+
+    std::ostream *Out = &std::cout;  // Default to printing to stdout.
+    std::string ErrorMessage;
+
+    std::auto_ptr<Module> M;
+   
+    if (MemoryBuffer *Buffer
+           = MemoryBuffer::getFileOrSTDIN(InputFilename, &ErrorMessage)) {
+      M.reset(ParseBitcodeFile(Buffer, &ErrorMessage));
+      delete Buffer;
+    }
+
+    if (M.get() == 0) {
+      cerr << argv[0] << ": ";
+      if (ErrorMessage.size())
+        cerr << ErrorMessage << "\n";
+      else
+        cerr << "bitcode didn't read correctly.\n";
+      return 1;
+    }
+    
+    if (DontPrint) {
+      // Just use stdout.  We won't actually print anything on it.
+    } else if (OutputFilename != "") {   // Specified an output filename?
+      if (OutputFilename != "-") { // Not stdout?
+        if (!Force && std::ifstream(OutputFilename.c_str())) {
+          // If force is not specified, make sure not to overwrite a file!
+          cerr << argv[0] << ": error opening '" << OutputFilename
+               << "': file exists! Sending to standard output.\n";
+        } else {
+          Out = new std::ofstream(OutputFilename.c_str());
+        }
+      }
+    } else {
+      if (InputFilename == "-") {
+        OutputFilename = "-";
+      } else {
+        std::string IFN = InputFilename;
+        int Len = IFN.length();
+        if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') {
+          // Source ends in .bc
+          OutputFilename = std::string(IFN.begin(), IFN.end()-3)+".ll";
+        } else {
+          OutputFilename = IFN+".ll";
+        }
+
+        if (!Force && std::ifstream(OutputFilename.c_str())) {
+          // If force is not specified, make sure not to overwrite a file!
+          cerr << argv[0] << ": error opening '" << OutputFilename
+               << "': file exists! Sending to standard output.\n";
+        } else {
+          Out = new std::ofstream(OutputFilename.c_str());
+
+          // Make sure that the Out file gets unlinked from the disk if we get a
+          // SIGINT
+          sys::RemoveFileOnSignal(sys::Path(OutputFilename));
+        }
+      }
+    }
+
+    if (!Out->good()) {
+      cerr << argv[0] << ": error opening " << OutputFilename
+           << ": sending to stdout instead!\n";
+      Out = &std::cout;
+    }
+
+    // All that llvm-dis does is write the assembly to a file.
+    if (!DontPrint) {
+      PassManager Passes;
+      raw_os_ostream L(*Out);
+      Passes.add(createPrintModulePass(&L));
+      Passes.run(*M.get());
+    }
+
+    if (Out != &std::cout) {
+      ((std::ofstream*)Out)->close();
+      delete Out;
+    }
+    return 0;
+  } catch (const std::string& msg) {
+    cerr << argv[0] << ": " << msg << "\n";
+  } catch (...) {
+    cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
+  }
+
+  return 1;
+}
+