Add external definitions for commonly-used template specializations and add

anchor methods to others.  This eliminates the vtable/template method bloat
in .o files that defining a cl::opt used to impose (~4K per .o file for one
cp::opt<unsigned>).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29909 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 37 insertions, 2 deletions

diff --git a/include/llvm/Support/CommandLine.h b/include/llvm/Support/CommandLine.h
index b352686e6d..8af6b2adbf 100644
--- a/include/llvm/Support/CommandLine.h
+++ b/include/llvm/Support/CommandLine.h
@@ -22,6 +22,7 @@
 
 #include "llvm/Support/type_traits.h"
 #include "llvm/Support/DataTypes.h"
+#include "llvm/Support/Compiler.h"
 #include <string>
 #include <vector>
 #include <utility>
@@ -509,6 +510,9 @@ struct basic_parser_impl {  // non-template implementation of basic_parser<t>
 
   // getValueName - Overload in subclass to provide a better default value.
   virtual const char *getValueName() const { return "value"; }
+
+  // An out-of-line virtual method to provide a 'home' for this class.
+  virtual void anchor();
 };
 
 // basic_parser - The real basic parser is just a template wrapper that provides
@@ -519,7 +523,6 @@ struct basic_parser : public basic_parser_impl {
   typedef DataType parser_data_type;
 };
 
-
 //--------------------------------------------------
 // parser<bool>
 //
@@ -533,10 +536,15 @@ public:
     return ValueOptional;
   }
 
-  // getValueName - Do not print =<value> at all
+  // getValueName - Do not print =<value> at all.
   virtual const char *getValueName() const { return 0; }
+  
+  // An out-of-line virtual method to provide a 'home' for this class.
+  virtual void anchor();
 };
 
+EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<bool>);
+
 
 //--------------------------------------------------
 // parser<int>
@@ -549,8 +557,13 @@ public:
 
   // getValueName - Overload in subclass to provide a better default value.
   virtual const char *getValueName() const { return "int"; }
+
+  // An out-of-line virtual method to provide a 'home' for this class.
+  virtual void anchor();
 };
 
+EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<int>);
+
 
 //--------------------------------------------------
 // parser<unsigned>
@@ -563,8 +576,12 @@ public:
 
   // getValueName - Overload in subclass to provide a better default value.
   virtual const char *getValueName() const { return "uint"; }
+
+  // An out-of-line virtual method to provide a 'home' for this class.
+  virtual void anchor();
 };
 
+EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<unsigned>);
 
 //--------------------------------------------------
 // parser<double>
@@ -577,8 +594,12 @@ public:
 
   // getValueName - Overload in subclass to provide a better default value.
   virtual const char *getValueName() const { return "number"; }
+
+  // An out-of-line virtual method to provide a 'home' for this class.
+  virtual void anchor();
 };
 
+EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<double>);
 
 //--------------------------------------------------
 // parser<float>
@@ -591,8 +612,12 @@ public:
 
   // getValueName - Overload in subclass to provide a better default value.
   virtual const char *getValueName() const { return "number"; }
+
+  // An out-of-line virtual method to provide a 'home' for this class.
+  virtual void anchor();
 };
 
+EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<float>);
 
 //--------------------------------------------------
 // parser<std::string>
@@ -609,8 +634,13 @@ public:
 
   // getValueName - Overload in subclass to provide a better default value.
   virtual const char *getValueName() const { return "string"; }
+
+  // An out-of-line virtual method to provide a 'home' for this class.
+  virtual void anchor();
 };
 
+EXTERN_TEMPLATE_INSTANTIATION(class basic_parser<std::string>);
+
 //===----------------------------------------------------------------------===//
 // applicator class - This class is used because we must use partial
 // specialization to handle literal string arguments specially (const char* does
@@ -845,6 +875,11 @@ public:
   }
 };
 
+EXTERN_TEMPLATE_INSTANTIATION(class opt<unsigned>);
+EXTERN_TEMPLATE_INSTANTIATION(class opt<int>);
+EXTERN_TEMPLATE_INSTANTIATION(class opt<std::string>);
+EXTERN_TEMPLATE_INSTANTIATION(class opt<bool>);
+
 //===----------------------------------------------------------------------===//
 // list_storage class