node.c: NODE_ALLOCA for ALLOCV

* node.c (rb_alloc_tmp_buffer): use NODE_ALLOCA to mark locations
  like as builtin alloca.  [ruby-core:70251] [Bug #11418]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51492 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 24 insertions, 0 deletions

diff --git a/node.c b/node.c
index 79f65ec684..7551a811c8 100644
--- a/node.c
+++ b/node.c
@@ -1075,3 +1075,27 @@ rb_gc_mark_node(NODE *obj)
     }
     return 0;
 }
+
+void *
+rb_alloc_tmp_buffer(volatile VALUE *store, long len)
+{
+    NODE *s = rb_node_newnode(NODE_ALLOCA, 0, 0, 0);
+    void *ptr = xmalloc(len);
+    s->u1.node = ptr;
+    s->u3.cnt = len / sizeof(VALUE);
+    *store = (VALUE)s;
+    return ptr;
+}
+
+void
+rb_free_tmp_buffer(volatile VALUE *store)
+{
+    VALUE s = *store;
+    *store = 0;
+    if (s) {
+	void *ptr = RNODE(s)->u1.node;
+	RNODE(s)->u1.node = 0;
+	RNODE(s)->u3.cnt = 0;
+	xfree(ptr);
+    }
+}