From 7c8d653a2cea0eb38340e71e70009d74816aeb64 Mon Sep 17 00:00:00 2001
From: Daniel Dunbar <daniel@zuster.org>
Date: Thu, 12 Mar 2009 18:20:18 +0000
Subject: [PATCH] Driver: Add ArgList support for synthesizing arguments.

llvm-svn: 66805
---
 clang/include/clang/Driver/ArgList.h | 32 +++++++++++++++++++++++++
 clang/lib/Driver/ArgList.cpp         | 36 ++++++++++++++++++++++++++++
 2 files changed, 68 insertions(+)

diff --git a/clang/include/clang/Driver/ArgList.h b/clang/include/clang/Driver/ArgList.h
index 2e47ee4c3948..bd2586ecb6ae 100644
--- a/clang/include/clang/Driver/ArgList.h
+++ b/clang/include/clang/Driver/ArgList.h
@@ -15,6 +15,8 @@
 #include "clang/Driver/Util.h"
 #include "llvm/ADT/SmallVector.h"
 
+#include <list>
+
 namespace clang {
 namespace driver {
   class Arg;
@@ -38,6 +40,9 @@ namespace driver {
     /// The full list of arguments.
     arglist_type Args;
 
+    /// Strings for synthesized arguments.
+    std::list<std::string> SynthesizedStrings;
+
   public:
     ArgList(const char **ArgBegin, const char **ArgEnd);
     ArgList(const ArgList &);
@@ -62,6 +67,33 @@ namespace driver {
 
     /// getLastArg - Return the last argument matching \arg Id, or null.
     Arg *getLastArg(options::ID Id) const;
+
+    /// @name Arg Synthesis
+    /// @{
+
+  private:    
+    /// MakeIndex - Get an index for the given string(s).
+    unsigned MakeIndex(const char *String0);
+    unsigned MakeIndex(const char *String0, const char *String1);
+
+  public:
+    /// MakeFlagArg - Construct a new FlagArg for the given option
+    /// \arg Id.
+    Arg *MakeFlagArg(const Option *Opt);
+
+    /// MakePositionalArg - Construct a new Positional arg for the
+    /// given option \arg Id, with the provided \arg Value.
+    Arg *MakePositionalArg(const Option *Opt, const char *Value);
+
+    /// MakeSeparateArg - Construct a new Positional arg for the
+    /// given option \arg Id, with the provided \arg Value.
+    Arg *MakeSeparateArg(const Option *Opt, const char *Value);
+
+    /// MakeJoinedArg - Construct a new Positional arg for the
+    /// given option \arg Id, with the provided \arg Value.
+    Arg *MakeJoinedArg(const Option *Opt, const char *Value);
+
+    /// @}
   };
 } // end namespace driver
 } // end namespace clang
diff --git a/clang/lib/Driver/ArgList.cpp b/clang/lib/Driver/ArgList.cpp
index e29977fb0e9f..87847c0c1327 100644
--- a/clang/lib/Driver/ArgList.cpp
+++ b/clang/lib/Driver/ArgList.cpp
@@ -40,3 +40,39 @@ Arg *ArgList::getLastArg(options::ID Id) const {
   
   return 0;
 }
+
+unsigned ArgList::MakeIndex(const char *String0) {
+  unsigned Index = ArgStrings.size();
+
+  // Tuck away so we have a reliable const char *.
+  SynthesizedStrings.push_back(String0);
+  ArgStrings.push_back(SynthesizedStrings.back().c_str());
+
+  return Index;
+}
+
+unsigned ArgList::MakeIndex(const char *String0, const char *String1) {
+  unsigned Index0 = MakeIndex(String0);
+  unsigned Index1 = MakeIndex(String1);
+  assert(Index0 == Index1 && "Unexpected non-consecutive indices!");
+  (void) Index1;
+  return Index0;
+}
+
+Arg *ArgList::MakeFlagArg(const Option *Opt) {
+  return new FlagArg(Opt, MakeIndex(Opt->getName()));
+}
+
+Arg *ArgList::MakePositionalArg(const Option *Opt, const char *Value) {
+  return new PositionalArg(Opt, MakeIndex(Value));
+}
+
+Arg *ArgList::MakeSeparateArg(const Option *Opt, const char *Value) {
+  return new SeparateArg(Opt, MakeIndex(Opt->getName(), Value), 1);
+}
+
+Arg *ArgList::MakeJoinedArg(const Option *Opt, const char *Value) {
+  std::string Joined(Opt->getName());
+  Joined += Value;
+  return new JoinedArg(Opt, MakeIndex(Joined.c_str()));
+}