* tree.c (free_lang_data_in_type): Free TREE_PURPOSE of

	TYPE_ARG_TYPES list.
	(verify_type): Permit non-NULL TREE_PURPOSE in non-LTO builds.
	* tree.def (FUNCTION_TYPE): Document TREE_PURPOSE in TYPE_ARG_TYPES


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@222984 138bc75d-0d04-0410-961f-82ee72b054a4

3 files changed, 39 insertions, 6 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 43047300fa7..2a43fe952ae 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,12 @@
 2015-05-09  Jan Hubicka  <hubicka@ucw.cz>
 
+	* tree.c (free_lang_data_in_type): Free TREE_PURPOSE of
+	TYPE_ARG_TYPES list.
+	(verify_type): Permit non-NULL TREE_PURPOSE in non-LTO builds.
+	* tree.def (FUNCTION_TYPE): Document TREE_PURPOSE in TYPE_ARG_TYPES
+
+2015-05-09  Jan Hubicka  <hubicka@ucw.cz>
+
 	* tree.c (verify_type): Verify TYPE_BINFO and TYPE_VALUES_RAW.
 	* tree.h (is_lang_specific): Constify.
 
diff --git a/gcc/tree.c b/gcc/tree.c
index fbedc1d52e3..b4dceed31dc 100644
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -5041,7 +5041,23 @@ free_lang_data_in_type (tree type)
 	      TREE_VALUE (p) = build_qualified_type (arg_type, quals);
 	      free_lang_data_in_type (TREE_VALUE (p));
 	    }
+	  /* C++ FE uses TREE_PURPOSE to store initial values.  */
+	  TREE_PURPOSE (p) = NULL;
 	}
+      /* Java uses TYPE_MINVAL for TYPE_ARGUMENT_SIGNATURE.  */
+      TYPE_MINVAL (type) = NULL;
+    }
+  if (TREE_CODE (type) == METHOD_TYPE)
+    {
+      tree p;
+
+      for (p = TYPE_ARG_TYPES (type); p; p = TREE_CHAIN (p))
+	{
+	  /* C++ FE uses TREE_PURPOSE to store initial values.  */
+	  TREE_PURPOSE (p) = NULL;
+	}
+      /* Java uses TYPE_MINVAL for TYPE_ARGUMENT_SIGNATURE.  */
+      TYPE_MINVAL (type) = NULL;
     }
 
   /* Remove members that are not actually FIELD_DECLs from the field
@@ -12619,13 +12635,18 @@ verify_type (const_tree t)
 	  error_found = true;
 	}
     }
-  else if (INTEGRAL_TYPE_P (t) || TREE_CODE (t) == REAL_TYPE || TREE_CODE (t) == FIXED_POINT_TYPE)
+  else if (INTEGRAL_TYPE_P (t) || TREE_CODE (t) == REAL_TYPE
+	   || TREE_CODE (t) == FIXED_POINT_TYPE)
     {
       /* FIXME: The following check should pass:
-	  useless_type_conversion_p (const_cast <tree> (t), TREE_TYPE (TYPE_MIN_VALUE (t))
+	  useless_type_conversion_p (const_cast <tree> (t),
+				     TREE_TYPE (TYPE_MIN_VALUE (t))
 	 but does not for C sizetypes in LTO.  */
     }
-  else if (TYPE_MINVAL (t))
+  /* Java uses TYPE_MINVAL for TYPE_ARGUMENT_SIGNATURE.  */
+  else if (TYPE_MINVAL (t)
+	   && ((TREE_CODE (t) != METHOD_TYPE && TREE_CODE (t) != FUNCTION_TYPE)
+	       || in_lto_p))
     {
       error ("TYPE_MINVAL non-NULL");
       debug_tree (TYPE_MINVAL (t));
@@ -12665,10 +12686,12 @@ verify_type (const_tree t)
 	  error_found = true;
 	}
     }
-  else if (INTEGRAL_TYPE_P (t) || TREE_CODE (t) == REAL_TYPE || TREE_CODE (t) == FIXED_POINT_TYPE)
+  else if (INTEGRAL_TYPE_P (t) || TREE_CODE (t) == REAL_TYPE
+	   || TREE_CODE (t) == FIXED_POINT_TYPE)
     {
       /* FIXME: The following check should pass:
-	  useless_type_conversion_p (const_cast <tree> (t), TREE_TYPE (TYPE_MAX_VALUE (t))
+	  useless_type_conversion_p (const_cast <tree> (t),
+				     TREE_TYPE (TYPE_MAX_VALUE (t))
 	 but does not for C sizetypes in LTO.  */
     }
   else if (TREE_CODE (t) == ARRAY_TYPE)
@@ -12817,7 +12840,8 @@ verify_type (const_tree t)
   else if (TREE_CODE (t) == FUNCTION_TYPE || TREE_CODE (t) == METHOD_TYPE)
     for (tree l = TYPE_ARG_TYPES (t); l; l = TREE_CHAIN (l))
       {
-	if (TREE_PURPOSE (l))
+	/* C++ FE uses TREE_PURPOSE to store initial values.  */
+	if (TREE_PURPOSE (l) && in_lto_p)
 	  {
 	    error ("TREE_PURPOSE is non-NULL in TYPE_ARG_TYPES list");
 	    debug_tree (l);
diff --git a/gcc/tree.def b/gcc/tree.def
index b4b41642a6d..ea7bea046d6 100644
--- a/gcc/tree.def
+++ b/gcc/tree.def
@@ -245,6 +245,8 @@ DEFTREECODE (POINTER_BOUNDS_TYPE, "pointer_bounds_type", tcc_type, 0)
    TREE_TYPE		    type of value returned.
    TYPE_ARG_TYPES      list of types of arguments expected.
 	this list is made of TREE_LIST nodes.
+	In this list TREE_PURPOSE can be used to indicate the default
+	value of parameter (used by C++ frontend).
    Types of "Procedures" in languages where they are different from functions
    have code FUNCTION_TYPE also, but then TREE_TYPE is zero or void type.  */
 DEFTREECODE (FUNCTION_TYPE, "function_type", tcc_type, 0)