[PATCH,java] convert DECL_FUNCTION_THROWS to a VEC

[Nathan Froyd <froydnj at codesourcery dot com>]

This patch does just what the subject suggests.  Less TREE_LIST bits are
a good thing.

Tested on x86_64-unknown-linux-gnu with the libjava testsuite.  No
regressions.  OK to commit?

-Nathan

	* java-tree.h (struct lang_decl_func): Change type of throws_list
	field to a VEC.
	* jcf-parse.c (HANDLE_EXCEPTIONS_ATTRIBUTE): Adjust for changed type
	of DECL_FUNCTION_THROWS.
	* class.c (make_method_value): Likewise.

Index: class.c
===================================================================
--- class.c	(revision 159870)
+++ class.c	(working copy)
@@ -1519,18 +1519,19 @@ make_method_value (tree mdecl)
   {
     /* Compute the `throws' information for the method.  */
     tree table = null_pointer_node;
-    if (DECL_FUNCTION_THROWS (mdecl) != NULL_TREE)
+    if (DECL_FUNCTION_THROWS (mdecl) != NULL)
       {
-	int length = 1 + list_length (DECL_FUNCTION_THROWS (mdecl));
-	tree iter, type, array;
+	int length = 1 + VEC_length (tree, DECL_FUNCTION_THROWS (mdecl));
+	tree t, type, array;
 	char buf[60];
+        unsigned ix;
 
 	table = tree_cons (NULL_TREE, table, NULL_TREE);
-	for (iter = DECL_FUNCTION_THROWS (mdecl);
-	     iter != NULL_TREE;
-	     iter = TREE_CHAIN (iter))
+	for (ix = 0;
+	     VEC_iterate (tree, DECL_FUNCTION_THROWS (mdecl), ix, t);
+	     ix++)
 	  {
-	    tree sig = DECL_NAME (TYPE_NAME (TREE_VALUE (iter)));
+	    tree sig = DECL_NAME (TYPE_NAME (t));
 	    tree utf8
 	      = build_utf8_ref (unmangle_classname (IDENTIFIER_POINTER (sig),
 						    IDENTIFIER_LENGTH (sig)));
Index: jcf-parse.c
===================================================================
--- jcf-parse.c	(revision 159870)
+++ jcf-parse.c	(working copy)
@@ -936,13 +936,14 @@ handle_signature_attribute (int member_i
 #define HANDLE_EXCEPTIONS_ATTRIBUTE(COUNT) \
 { \
   int n = COUNT; \
-  tree list = DECL_FUNCTION_THROWS (current_method); \
+  VEC (tree,gc) *v = VEC_alloc (tree, gc, n); \
+  gcc_assert (DECL_FUNCTION_THROWS (current_method) == NULL); \
   while (--n >= 0) \
     { \
       tree thrown_class = get_class_constant (jcf, JCF_readu2 (jcf)); \
-      list = tree_cons (NULL_TREE, thrown_class, list); \
+      VEC_quick_push (tree, v, thrown_class); \
     } \
-  DECL_FUNCTION_THROWS (current_method) = nreverse (list); \
+  DECL_FUNCTION_THROWS (current_method) = v; \
 }
 
 #define HANDLE_DEPRECATED_ATTRIBUTE()  handle_deprecated ()
Index: ChangeLog
===================================================================
Index: java-tree.h
===================================================================
--- java-tree.h	(revision 159870)
+++ java-tree.h	(working copy)
@@ -776,7 +776,7 @@ struct GTY(()) lang_decl_func {
   int max_stack;
   int arg_slot_count;
   source_location last_line;	/* End line number for a function decl */
-  tree throws_list;		/* Exception specified by `throws' */
+  VEC(tree,gc) *throws_list;	/* Exception specified by `throws' */
   tree exc_obj;			/* Decl holding the exception object.  */
 
   /* Class initialization test variables  */