Support: add 6-parameter format

Since we cannot yet use variadic templates, add a specialisation for
6-parameters to format.  This is motivated by a need for the additional
parameter for formatting information for an unwind decoder for Windows on ARM.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209999 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/Format.h

@@ -170,6 +170,30 @@ class format_object5 : public format_object_base {
   }
 };
 
+/// format_object6 - This is a templated helper class used by the format
+/// function that captures the object to be formated and the format string. When
+/// actually printed, this synthesizes the string into a temporary buffer
+/// provided and returns whether or not it is big enough.
+template <typename T1, typename T2, typename T3, typename T4, typename T5,
+          typename T6>
+class format_object6 : public format_object_base {
+  T1 Val1;
+  T2 Val2;
+  T3 Val3;
+  T4 Val4;
+  T5 Val5;
+  T6 Val6;
+public:
+  format_object6(const char *Fmt, const T1 &Val1, const T2 &Val2,
+                 const T3 &Val3, const T4 &Val4, const T5 &Val5, const T6 &Val6)
+    : format_object_base(Fmt), Val1(Val1), Val2(Val2), Val3(Val3), Val4(Val4),
+      Val5(Val5), Val6(Val6) { }
+
+  int snprint(char *Buffer, unsigned BufferSize) const override {
+    return snprintf(Buffer, BufferSize, Fmt, Val1, Val2, Val3, Val4, Val5, Val6);
+  }
+};
+
 /// This is a helper function that is used to produce formatted output.
 ///
 /// This is typically used like:
@@ -231,6 +255,21 @@ inline format_object5<T1, T2, T3, T4, T5> format(const char *Fmt,const T1 &Val1,
   return format_object5<T1, T2, T3, T4, T5>(Fmt, Val1, Val2, Val3, Val4, Val5);
 }
 
+/// This is a helper function that is used to produce formatted output.
+///
+/// This is typically used like:
+/// \code
+///   OS << format("%0.4f", myfloat) << '\n';
+/// \endcode
+template <typename T1, typename T2, typename T3, typename T4, typename T5,
+          typename T6>
+inline format_object6<T1, T2, T3, T4, T5, T6>
+format(const char *Fmt, const T1 &Val1, const T2 &Val2, const T3 &Val3,
+       const T4 &Val4, const T5 &Val5, const T6 &Val6) {
+  return format_object6<T1, T2, T3, T4, T5, T6>(Fmt, Val1, Val2, Val3, Val4,
+                                                Val5, Val6);
+}
+
 } // end namespace llvm
 
 #endif