Driver: More Option implementation.

 - Add Options.def file, collects option information.

 - Actual option instantiation is handled lazily by OptTable to allow
   the driver to not need to instantiate all options.

 - cast<> support for Option, other minor tweaks.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@66028 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 55 insertions, 0 deletions

diff --git a/include/clang/Driver/Options.h b/include/clang/Driver/Options.h
new file mode 100644
index 0000000000..ad737635c4
--- /dev/null
+++ b/include/clang/Driver/Options.h
@@ -0,0 +1,55 @@
+//===--- Options.h - Option info & table ------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef CLANG_DRIVER_OPTIONS_H_
+#define CLANG_DRIVER_OPTIONS_H_
+
+namespace clang {
+namespace driver {
+namespace options {
+  enum ID {
+    NotOption = 0, // This is not an option ID.
+#define OPTION(ID, KIND, NAME, GROUP, ALIAS, FLAGS, PARAM) ID,
+#include "clang/Driver/Options.def"
+    LastOption
+#undef OPTION
+  };
+}
+  
+  class Option;
+
+  /// OptTable - Provide access to the Option info table.
+  ///
+  /// The OptTable class provides a layer of indirection which allows
+  /// Option instance to be created lazily. In the common case, only a
+  /// few options will be needed at runtime; the OptTable class
+  /// maintains enough information to parse command lines without
+  /// instantiating Options, while letting other parts of the driver
+  /// still use Option instances where convient.  
+  class OptTable {
+    mutable Option **Options;
+
+    Option *constructOption(options::ID id) const;
+
+  public:
+    OptTable();
+    ~OptTable();
+
+    unsigned getNumOptions() const;
+
+    const char *getOptionName(options::ID id) const;
+
+    /// getOption - Get the given \arg id's Option instance, lazily
+    /// creating it if necessary.
+    const Option *getOption(options::ID id) const;
+  };
+}
+}
+
+#endif