glsl2: Add a generic visitor class to call back with pointers to each rvalue.

I keep copy and pasting this code all over, so consolidate it in one
place.

1 files changed, 47 insertions, 0 deletions

diff --git a/src/glsl/ir_rvalue_visitor.h b/src/glsl/ir_rvalue_visitor.h
new file mode 100644
index 00000000000..31a56beb9b8
--- /dev/null
+++ b/src/glsl/ir_rvalue_visitor.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright © 2010 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/**
+ * \file ir_rvalue_visitor.h
+ *
+ * Generic class to implement the common pattern we have of wanting to
+ * visit each ir_rvalue * and possibly change that node to a different
+ * class.  Just implement handle_rvalue() and you will be called with
+ * a pointer to each rvalue in the tree.
+ */
+
+class ir_rvalue_visitor : public ir_hierarchical_visitor {
+public:
+
+   virtual ir_visitor_status visit_leave(ir_assignment *);
+   virtual ir_visitor_status visit_leave(ir_call *);
+   virtual ir_visitor_status visit_leave(ir_dereference_array *);
+   virtual ir_visitor_status visit_leave(ir_dereference_record *);
+   virtual ir_visitor_status visit_leave(ir_expression *);
+   virtual ir_visitor_status visit_leave(ir_if *);
+   virtual ir_visitor_status visit_leave(ir_return *);
+   virtual ir_visitor_status visit_leave(ir_swizzle *);
+   virtual ir_visitor_status visit_leave(ir_texture *);
+
+   virtual void handle_rvalue(ir_rvalue **rvalue) = 0;
+};