glsl: Add a variant of the rvalue visitor for handle_rvalue() on the way down.

For the UBO lowering pass, I want to see the whole dereference chain for
replacing, not the innermost ir_dereference_variable.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/glsl/ir_rvalue_visitor.cpp

@@ -36,7 +36,7 @@
 #include "glsl_types.h"
 
 ir_visitor_status
-ir_rvalue_visitor::visit_leave(ir_expression *ir)
+ir_rvalue_base_visitor::rvalue_visit(ir_expression *ir)
 {
    unsigned int operand;
 
@@ -48,7 +48,7 @@ ir_rvalue_visitor::visit_leave(ir_expression *ir)
 }
 
 ir_visitor_status
-ir_rvalue_visitor::visit_leave(ir_texture *ir)
+ir_rvalue_base_visitor::rvalue_visit(ir_texture *ir)
 {
    handle_rvalue(&ir->coordinate);
    handle_rvalue(&ir->projector);
@@ -76,14 +76,14 @@ ir_rvalue_visitor::visit_leave(ir_texture *ir)
 }
 
 ir_visitor_status
-ir_rvalue_visitor::visit_leave(ir_swizzle *ir)
+ir_rvalue_base_visitor::rvalue_visit(ir_swizzle *ir)
 {
    handle_rvalue(&ir->val);
    return visit_continue;
 }
 
 ir_visitor_status
-ir_rvalue_visitor::visit_leave(ir_dereference_array *ir)
+ir_rvalue_base_visitor::rvalue_visit(ir_dereference_array *ir)
 {
    /* The array index is not the target of the assignment, so clear the
     * 'in_assignee' flag.  Restore it after returning from the array index.
@@ -98,14 +98,14 @@ ir_rvalue_visitor::visit_leave(ir_dereference_array *ir)
 }
 
 ir_visitor_status
-ir_rvalue_visitor::visit_leave(ir_dereference_record *ir)
+ir_rvalue_base_visitor::rvalue_visit(ir_dereference_record *ir)
 {
    handle_rvalue(&ir->record);
    return visit_continue;
 }
 
 ir_visitor_status
-ir_rvalue_visitor::visit_leave(ir_assignment *ir)
+ir_rvalue_base_visitor::rvalue_visit(ir_assignment *ir)
 {
    handle_rvalue(&ir->rhs);
    handle_rvalue(&ir->condition);
@@ -114,7 +114,7 @@ ir_rvalue_visitor::visit_leave(ir_assignment *ir)
 }
 
 ir_visitor_status
-ir_rvalue_visitor::visit_leave(ir_call *ir)
+ir_rvalue_base_visitor::rvalue_visit(ir_call *ir)
 {
    foreach_iter(exec_list_iterator, iter, *ir) {
       ir_rvalue *param = (ir_rvalue *)iter.get();
@@ -129,15 +129,124 @@ ir_rvalue_visitor::visit_leave(ir_call *ir)
 }
 
 ir_visitor_status
-ir_rvalue_visitor::visit_leave(ir_return *ir)
+ir_rvalue_base_visitor::rvalue_visit(ir_return *ir)
 {
    handle_rvalue(&ir->value);;
    return visit_continue;
 }
 
 ir_visitor_status
-ir_rvalue_visitor::visit_leave(ir_if *ir)
+ir_rvalue_base_visitor::rvalue_visit(ir_if *ir)
 {
    handle_rvalue(&ir->condition);
    return visit_continue;
 }
+
+
+ir_visitor_status
+ir_rvalue_visitor::visit_leave(ir_expression *ir)
+{
+   return rvalue_visit(ir);
+}
+
+ir_visitor_status
+ir_rvalue_visitor::visit_leave(ir_texture *ir)
+{
+   return rvalue_visit(ir);
+}
+
+ir_visitor_status
+ir_rvalue_visitor::visit_leave(ir_swizzle *ir)
+{
+   return rvalue_visit(ir);
+}
+
+ir_visitor_status
+ir_rvalue_visitor::visit_leave(ir_dereference_array *ir)
+{
+   return rvalue_visit(ir);
+}
+
+ir_visitor_status
+ir_rvalue_visitor::visit_leave(ir_dereference_record *ir)
+{
+   return rvalue_visit(ir);
+}
+
+ir_visitor_status
+ir_rvalue_visitor::visit_leave(ir_assignment *ir)
+{
+   return rvalue_visit(ir);
+}
+
+ir_visitor_status
+ir_rvalue_visitor::visit_leave(ir_call *ir)
+{
+   return rvalue_visit(ir);
+}
+
+ir_visitor_status
+ir_rvalue_visitor::visit_leave(ir_return *ir)
+{
+   return rvalue_visit(ir);
+}
+
+ir_visitor_status
+ir_rvalue_visitor::visit_leave(ir_if *ir)
+{
+   return rvalue_visit(ir);
+}
+
+ir_visitor_status
+ir_rvalue_enter_visitor::visit_enter(ir_expression *ir)
+{
+   return rvalue_visit(ir);
+}
+
+ir_visitor_status
+ir_rvalue_enter_visitor::visit_enter(ir_texture *ir)
+{
+   return rvalue_visit(ir);
+}
+
+ir_visitor_status
+ir_rvalue_enter_visitor::visit_enter(ir_swizzle *ir)
+{
+   return rvalue_visit(ir);
+}
+
+ir_visitor_status
+ir_rvalue_enter_visitor::visit_enter(ir_dereference_array *ir)
+{
+   return rvalue_visit(ir);
+}
+
+ir_visitor_status
+ir_rvalue_enter_visitor::visit_enter(ir_dereference_record *ir)
+{
+   return rvalue_visit(ir);
+}
+
+ir_visitor_status
+ir_rvalue_enter_visitor::visit_enter(ir_assignment *ir)
+{
+   return rvalue_visit(ir);
+}
+
+ir_visitor_status
+ir_rvalue_enter_visitor::visit_enter(ir_call *ir)
+{
+   return rvalue_visit(ir);
+}
+
+ir_visitor_status
+ir_rvalue_enter_visitor::visit_enter(ir_return *ir)
+{
+   return rvalue_visit(ir);
+}
+
+ir_visitor_status
+ir_rvalue_enter_visitor::visit_enter(ir_if *ir)
+{
+   return rvalue_visit(ir);
+}

src/glsl/ir_rvalue_visitor.h

@@ -30,7 +30,22 @@
  * a pointer to each rvalue in the tree.
  */
 
-class ir_rvalue_visitor : public ir_hierarchical_visitor {
+class ir_rvalue_base_visitor : public ir_hierarchical_visitor {
+public:
+   ir_visitor_status rvalue_visit(ir_assignment *);
+   ir_visitor_status rvalue_visit(ir_call *);
+   ir_visitor_status rvalue_visit(ir_dereference_array *);
+   ir_visitor_status rvalue_visit(ir_dereference_record *);
+   ir_visitor_status rvalue_visit(ir_expression *);
+   ir_visitor_status rvalue_visit(ir_if *);
+   ir_visitor_status rvalue_visit(ir_return *);
+   ir_visitor_status rvalue_visit(ir_swizzle *);
+   ir_visitor_status rvalue_visit(ir_texture *);
+
+   virtual void handle_rvalue(ir_rvalue **rvalue) = 0;
+};
+
+class ir_rvalue_visitor : public ir_rvalue_base_visitor {
 public:
 
    virtual ir_visitor_status visit_leave(ir_assignment *);
@@ -42,6 +57,18 @@ public:
    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;
+
+class ir_rvalue_enter_visitor : public ir_rvalue_base_visitor {
+public:
+
+   virtual ir_visitor_status visit_enter(ir_assignment *);
+   virtual ir_visitor_status visit_enter(ir_call *);
+   virtual ir_visitor_status visit_enter(ir_dereference_array *);
+   virtual ir_visitor_status visit_enter(ir_dereference_record *);
+   virtual ir_visitor_status visit_enter(ir_expression *);
+   virtual ir_visitor_status visit_enter(ir_if *);
+   virtual ir_visitor_status visit_enter(ir_return *);
+   virtual ir_visitor_status visit_enter(ir_swizzle *);
+   virtual ir_visitor_status visit_enter(ir_texture *);
 };