Add GTY support for irange.

Right now we have GTY support for static storage iranges
(int_range<>).  However, there's no reason why the base
class can't be used with GC, other than it was an oversight.

For that matter, the base class has a pointer to the sub-range
storage, so we can use the same implementation for both.  This
patch does so.

I have also removed the DEFINE_INT_RANGE_GC_STUBS
stuff, and have documented why we need a separate
gt_pch_nx (int_range<1> *&) version.  This has to do with
hash-traits.h, which ipa-prop.c is using to store a value_range.
The header file hash-traits.h is defining an extern of
gt_pch_nx (int_range<1> *&) etc, instead of calling the
more generic (int_range<1> *) which is already available.

It seems suspect that has-traits.h has their own externs
for GC functions, and if someone has a better solution, I'd
be glad to hear it.

gcc/ChangeLog:

	* value-range.cc (DEFINE_INT_RANGE_GC_STUBS): Remove.
	(gt_pch_nx (int_range<1> *&)): New.
	(gt_ggc_mx (int_range<1> *&)): New.
	* value-range.h (class irange): Add GTY support for
	the base class.

1 files changed, 14 insertions, 21 deletions

diff --git a/gcc/value-range.cc b/gcc/value-range.cc
index 2decd08..865344f 100644
--- a/gcc/value-range.cc
+++ b/gcc/value-range.cc
@@ -2044,26 +2044,20 @@ vrp_operand_equal_p (const_tree val1, const_tree val2)
   return true;
 }
 
-#define DEFINE_INT_RANGE_GC_STUBS(N)		\
-  void						\
-  gt_pch_nx (int_range<N> *&x)			\
-  {						\
-    for (unsigned i = 0; i < N; ++i)		\
-      {						\
-	gt_pch_nx (x->m_ranges[i * 2]);		\
-	gt_pch_nx (x->m_ranges[i * 2 + 1]);	\
-      }		  		       		\
-  }						\
-						\
-  void						\
-  gt_ggc_mx (int_range<N> *&x)			\
-  {	    	       				\
-    for (unsigned i = 0; i < N; ++i)		\
-      {						\
-	  gt_ggc_mx (x->m_ranges[i * 2]);	\
-	  gt_ggc_mx (x->m_ranges[i * 2 + 1]);	\
-      }						\
-  }
+// ?? These stubs are for ipa-prop.c which use a value_range in a
+// hash_traits.  hash-traits.h defines an extern of gt_ggc_mx (T &)
+// instead of picking up the gt_ggc_mx (T *) version.
+void
+gt_pch_nx (int_range<1> *&x)
+{
+  return gt_pch_nx ((irange *) x);
+}
+
+void
+gt_ggc_mx (int_range<1> *&x)
+{
+  return gt_ggc_mx ((irange *) x);
+}
 
 #define DEFINE_INT_RANGE_INSTANCE(N)					\
   template int_range<N>::int_range(tree, tree, value_range_kind);	\
@@ -2080,7 +2074,6 @@ DEFINE_INT_RANGE_INSTANCE(1)
 DEFINE_INT_RANGE_INSTANCE(2)
 DEFINE_INT_RANGE_INSTANCE(3)
 DEFINE_INT_RANGE_INSTANCE(255)
-DEFINE_INT_RANGE_GC_STUBS(1)
 
 #if CHECKING_P
 #include "selftest.h"