1 files changed, 98 insertions, 0 deletions
diff --git a/tools/opt/opt.cpp b/tools/opt/opt.cpp
new file mode 100644
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--- /dev/null
+++ b/tools/opt/opt.cpp
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+//===------------------------------------------------------------------------===
+// LLVM 'OPT' UTILITY 
+//
+// This utility may be invoked in the following manner:
+//  opt --help               - Output information about command line switches
+//  opt [options] -dce       - Run a dead code elimination pass on input 
+//                             bytecodes
+//  opt [options] -constprop - Run a constant propogation pass on input 
+//                             bytecodes
+//  opt [options] -inline    - Run a method inlining pass on input bytecodes
+//  opt [options] -strip     - Strip symbol tables out of methods
+//  opt [options] -mstrip    - Strip module & method symbol tables
+//
+// Optimizations may be specified an arbitrary number of times on the command
+// line, they are run in the order specified.
+//
+// TODO: Add a -all option to keep applying all optimizations until the program
+//       stops permuting.
+// TODO: Add a -h command line arg that prints all available optimizations
+// TODO: Add a -q command line arg that quiets "XXX pass made modifications"
+//
+//===------------------------------------------------------------------------===
+
+#include <iostream.h>
+#include <fstream.h>
+#include "llvm/Module.h"
+#include "llvm/Bytecode/Reader.h"
+#include "llvm/Bytecode/Writer.h"
+#include "llvm/Tools/CommandLine.h"
+#include "llvm/Opt/AllOpts.h"
+
+struct {
+  const string ArgName, Name;
+  bool (*OptPtr)(Module *C);
+} OptTable[] = {
+  { "-dce",      "Dead Code Elimination", DoDeadCodeElimination },
+  { "-constprop","Constant Propogation",  DoConstantPropogation }, 
+  { "-inline"   ,"Method Inlining",       DoMethodInlining      },
+  { "-strip"    ,"Strip Symbols",         DoSymbolStripping     },
+  { "-mstrip"   ,"Strip Module Symbols",  DoFullSymbolStripping },
+};
+
+int main(int argc, char **argv) {
+  ToolCommandLine Opts(argc, argv, false);
+  bool Quiet = false;
+
+  for (int i = 1; i < argc; i++) {
+    if (string(argv[i]) == string("--help")) {
+      cerr << argv[0] << " usage:\n"
+           << "  " << argv[0] << " --help  - Print this usage information\n";
+      return 1;
+    } else if (string(argv[i]) == string("-q")) {
+      Quiet = true; argv[i] = 0;
+    }
+  }
+  
+  ostream *Out = &cout;  // Default to printing to stdout...
+
+  Module *C = ParseBytecodeFile(Opts.getInputFilename());
+  if (C == 0) {
+    cerr << "bytecode didn't read correctly.\n";
+    return 1;
+  }
+
+
+  for (int i = 1; i < argc; i++) {
+    if (argv[i] == 0) continue;
+    unsigned j;
+    for (j = 0; j < sizeof(OptTable)/sizeof(OptTable[0]); j++) {
+      if (string(argv[i]) == OptTable[j].ArgName) {
+        if (OptTable[j].OptPtr(C) && !Quiet)
+          cerr << OptTable[j].Name << " pass made modifications!\n";
+        break;
+      }
+    }
+
+    if (j == sizeof(OptTable)/sizeof(OptTable[0])) 
+      cerr << "'" << argv[i] << "' argument unrecognized: ignored\n";
+  }
+
+  if (Opts.getOutputFilename() != "-") {
+    Out = new ofstream(Opts.getOutputFilename().c_str(), 
+                       (Opts.getForce() ? 0 : ios::noreplace)|ios::out);
+    if (!Out->good()) {
+      cerr << "Error opening " << Opts.getOutputFilename() 
+           << "!\n";
+      delete C;
+      return 1;
+    }
+  }
+
+  // Okay, we're done now... write out result...
+  WriteBytecodeToFile(C, *Out);
+  delete C;
+
+  if (Out != &cout) delete Out;
+  return 0;
+}