glsl: Improve the local dead code optimization to eliminate unused channels.

[mesa.git] / src / glsl / ir_visitor.h

diff --git a/src/glsl/ir_visitor.h b/src/glsl/ir_visitor.h
index b87d737318080fd0d163f7b0261c0c66e7302bca..4a00155be2f9afd9bce58dae8277046f3ec27641 100644 (file)
--- a/src/glsl/ir_visitor.h
+++ b/src/glsl/ir_visitor.h
@@ -44,6 +44,7 @@ public:
     * the hierarchy should not have \c visit methods.
     */
    /*@{*/
+   virtual void visit(class ir_rvalue *) { assert(!"unhandled error_type"); }
    virtual void visit(class ir_variable *) = 0;
    virtual void visit(class ir_function_signature *) = 0;
    virtual void visit(class ir_function *) = 0;
@@ -64,4 +65,21 @@ public:
    /*@}*/
 };
 
+/* NOTE: function calls may never return due to discards inside them
+ * This is usually not an issue, but if it is, keep it in mind
+ */
+class ir_control_flow_visitor : public ir_visitor {
+public:
+   virtual void visit(class ir_variable *) {}
+   virtual void visit(class ir_expression *) {}
+   virtual void visit(class ir_texture *) {}
+   virtual void visit(class ir_swizzle *) {}
+   virtual void visit(class ir_dereference_variable *) {}
+   virtual void visit(class ir_dereference_array *) {}
+   virtual void visit(class ir_dereference_record *) {}
+   virtual void visit(class ir_assignment *) {}
+   virtual void visit(class ir_constant *) {}
+   virtual void visit(class ir_call *) {}
+};
+
 #endif /* IR_VISITOR_H */