Initial checkin of GCCAS

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1058 91177308-0d34-0410-b5e6-96231b3b80d8

tools/gccas/Makefile

@@ -0,0 +1,6 @@
+LEVEL = ../..
+
+TOOLNAME = gccas
+USEDLIBS = asmparser bcwriter analysis transforms opt vmcore asmwriter support
+
+include $(LEVEL)/Makefile.common

tools/gccas/gccas.cpp

@@ -0,0 +1,74 @@
+//===------------------------------------------------------------------------===
+// LLVM 'GCCAS' UTILITY 
+//
+//  This utility is designed to be used by the GCC frontend for creating
+// bytecode files from it's intermediate llvm assembly.  The requirements for
+// this utility are thus slightly different than that of the standard as util.
+//
+//===------------------------------------------------------------------------===
+
+#include "llvm/Module.h"
+#include "llvm/Assembly/Parser.h"
+#include "llvm/Transforms/CleanupGCCOutput.h"
+#include "llvm/Optimizations/DCE.h"
+#include "llvm/Bytecode/Writer.h"
+#include "llvm/Support/CommandLine.h"
+#include <memory>
+#include <fstream>
+#include <string>
+
+cl::String InputFilename ("", "Parse <arg> file, compile to bytecode",
+                          cl::Required, "");
+cl::String OutputFilename("o", "Override output filename", cl::NoFlags, "");
+
+int main(int argc, char **argv) {
+  cl::ParseCommandLineOptions(argc, argv, " llvm .ll -> .bc assembler\n");
+
+  ostream *Out = 0;
+  std::auto_ptr<Module> M;
+  try {
+    // Parse the file now...
+    M.reset(ParseAssemblyFile(InputFilename));
+  } catch (const ParseException &E) {
+    cerr << E.getMessage() << endl;
+    return 1;
+  }
+
+  if (M.get() == 0) {
+    cerr << "assembly didn't read correctly.\n";
+    return 1;
+  }
+  
+  if (OutputFilename == "") {   // Didn't specify an output filename?
+    string IFN = InputFilename;
+    int Len = IFN.length();
+    if (IFN[Len-2] == '.' && IFN[Len-1] == 's') {   // Source ends in .s?
+      OutputFilename = string(IFN.begin(), IFN.end()-2);
+    } else {
+      OutputFilename = IFN;   // Append a .o to it
+    }
+    OutputFilename += ".o";
+  }
+
+  Out = new ofstream(OutputFilename.c_str(), ios::out);
+  if (!Out->good()) {
+    cerr << "Error opening " << OutputFilename << "!\n";
+    return 1;
+  }
+
+  // In addition to just parsing the input from GCC, we also want to spiff it up
+  // a little bit.  Do this now.
+  //
+  vector<Pass*> Passes;
+  Passes.push_back(new CleanupGCCOutput());
+  Passes.push_back(new opt::DeadCodeElimination());
+
+  // Run our queue of passes all at once now, efficiently.  This form of
+  // runAllPasses frees the Pass objects after runAllPasses completes.
+  //
+  Pass::runAllPassesAndFree(M.get(), Passes);
+
+  WriteBytecodeToFile(M.get(), *Out);
+  return 0;
+}
+