1 files changed, 161 insertions, 0 deletions
diff --git a/tools/llvm-mc/llvm-mc.cpp b/tools/llvm-mc/llvm-mc.cpp
new file mode 100644
index 000000000000..52205c48d0fb
--- /dev/null
+++ b/tools/llvm-mc/llvm-mc.cpp
@@ -0,0 +1,161 @@
+//===-- llvm-mc.cpp - Machine Code Hacking Driver -------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This utility is a simple driver that allows command line hacking on machine
+// code.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/PrettyStackTrace.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/System/Signals.h"
+#include "AsmParser.h"
+using namespace llvm;
+
+static cl::opt<std::string>
+InputFilename(cl::Positional, cl::desc("<input file>"), cl::init("-"));
+
+static cl::opt<std::string>
+OutputFilename("o", cl::desc("Output filename"),
+               cl::value_desc("filename"));
+
+static cl::list<std::string>
+IncludeDirs("I", cl::desc("Directory of include files"),
+            cl::value_desc("directory"), cl::Prefix);
+
+enum ActionType {
+  AC_AsLex,
+  AC_Assemble
+};
+
+static cl::opt<ActionType>
+Action(cl::desc("Action to perform:"),
+       cl::init(AC_Assemble),
+       cl::values(clEnumValN(AC_AsLex, "as-lex",
+                             "Lex tokens from a .s file"),
+                  clEnumValN(AC_Assemble, "assemble",
+                             "Assemble a .s file (default)"),
+                  clEnumValEnd));
+
+static int AsLexInput(const char *ProgName) {
+  std::string ErrorMessage;
+  MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(InputFilename,
+                                                      &ErrorMessage);
+  if (Buffer == 0) {
+    errs() << ProgName << ": ";
+    if (ErrorMessage.size())
+      errs() << ErrorMessage << "\n";
+    else
+      errs() << "input file didn't read correctly.\n";
+    return 1;
+  }
+
+  SourceMgr SrcMgr;
+  
+  // Tell SrcMgr about this buffer, which is what TGParser will pick up.
+  SrcMgr.AddNewSourceBuffer(Buffer, SMLoc());
+  
+  // Record the location of the include directories so that the lexer can find
+  // it later.
+  SrcMgr.setIncludeDirs(IncludeDirs);
+
+  AsmLexer Lexer(SrcMgr);
+  
+  bool Error = false;
+  
+  asmtok::TokKind Tok = Lexer.Lex();
+  while (Tok != asmtok::Eof) {
+    switch (Tok) {
+    default:
+      Lexer.PrintMessage(Lexer.getLoc(), "driver: unknown token");
+      Error = true;
+      break;
+    case asmtok::Error:
+      Error = true; // error already printed.
+      break;
+    case asmtok::Identifier:
+      outs() << "identifier: " << Lexer.getCurStrVal() << '\n';
+      break;
+    case asmtok::Register:
+      outs() << "register: " << Lexer.getCurStrVal() << '\n';
+      break;
+    case asmtok::String:
+      outs() << "string: " << Lexer.getCurStrVal() << '\n';
+      break;
+    case asmtok::IntVal:
+      outs() << "int: " << Lexer.getCurIntVal() << '\n';
+      break;
+    case asmtok::EndOfStatement: outs() << "EndOfStatement\n"; break;
+    case asmtok::Colon:  outs() << "Colon\n"; break;
+    case asmtok::Plus:   outs() << "Plus\n"; break;
+    case asmtok::Minus:  outs() << "Minus\n"; break;
+    case asmtok::Tilde:  outs() << "Tilde\n"; break;
+    case asmtok::Slash:  outs() << "Slash\n"; break;
+    case asmtok::LParen: outs() << "LParen\n"; break;
+    case asmtok::RParen: outs() << "RParen\n"; break;
+    case asmtok::Star:   outs() << "Star\n"; break;
+    case asmtok::Comma:  outs() << "Comma\n"; break;
+    case asmtok::Dollar: outs() << "Dollar\n"; break;
+    }
+    
+    Tok = Lexer.Lex();
+  }
+  
+  return Error;
+}
+
+static int AssembleInput(const char *ProgName) {
+  std::string ErrorMessage;
+  MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(InputFilename,
+                                                      &ErrorMessage);
+  if (Buffer == 0) {
+    errs() << ProgName << ": ";
+    if (ErrorMessage.size())
+      errs() << ErrorMessage << "\n";
+    else
+      errs() << "input file didn't read correctly.\n";
+    return 1;
+  }
+  
+  SourceMgr SrcMgr;
+  
+  // Tell SrcMgr about this buffer, which is what TGParser will pick up.
+  SrcMgr.AddNewSourceBuffer(Buffer, SMLoc());
+  
+  // Record the location of the include directories so that the lexer can find
+  // it later.
+  SrcMgr.setIncludeDirs(IncludeDirs);
+  
+  AsmParser Parser(SrcMgr);
+  return Parser.Run();
+}  
+
+
+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, "llvm machine code playground\n");
+
+  switch (Action) {
+  default:
+  case AC_AsLex:
+    return AsLexInput(argv[0]);
+  case AC_Assemble:
+    return AssembleInput(argv[0]);
+  }
+  
+  return 0;
+}
+