glsl: Use a new foreach_two_lists macro for walking two lists at once.

When handling function calls, we often want to walk through the list of
formal parameters and list of actual parameters at the same time.
(Both are guaranteed to be the same length.)

Previously, we used a pattern of:

   exec_list_iterator 1st_iter = <1st list>.iterator();
   foreach_iter(exec_list_iterator, 2nd_iter, <2nd list>) {
      ...
      1st_iter.next();
   }

This was awkward, since you had to manually iterate through one of
the two lists.

This patch introduces a foreach_two_lists macro which safely walks
through two lists at the same time, so you can simply do:

   foreach_two_lists(1st_node, <1st list>, 2nd_node, <2nd list>) {
      ...
   }

v2: Rename macro from foreach_list2 to foreach_two_lists, as suggested
    by Ian Romanick.

Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Matt Turner <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>

1 files changed, 4 insertions, 6 deletions

diff --git a/src/glsl/opt_tree_grafting.cpp b/src/glsl/opt_tree_grafting.cpp
index 6d75a157383..f3bd580af19 100644
--- a/src/glsl/opt_tree_grafting.cpp
+++ b/src/glsl/opt_tree_grafting.cpp
@@ -204,11 +204,10 @@ ir_tree_grafting_visitor::visit_enter(ir_function_signature *ir)
 ir_visitor_status
 ir_tree_grafting_visitor::visit_enter(ir_call *ir)
 {
-   exec_list_iterator sig_iter = ir->callee->parameters.iterator();
-   /* Reminder: iterating ir_call iterates its parameters. */
-   foreach_iter(exec_list_iterator, iter, *ir) {
-      ir_variable *sig_param = (ir_variable *)sig_iter.get();
-      ir_rvalue *ir = (ir_rvalue *)iter.get();
+   foreach_two_lists(formal_node, &ir->callee->parameters,
+                     actual_node, &ir->actual_parameters) {
+      ir_variable *sig_param = (ir_variable *) formal_node;
+      ir_rvalue *ir = (ir_rvalue *) actual_node;
       ir_rvalue *new_ir = ir;
 
       if (sig_param->data.mode != ir_var_function_in
@@ -222,7 +221,6 @@ ir_tree_grafting_visitor::visit_enter(ir_call *ir)
 	 ir->replace_with(new_ir);
 	 return visit_stop;
       }
-      sig_iter.next();
    }
 
    if (ir->return_deref && check_graft(ir, ir->return_deref->var) == visit_stop)