glsl: Add some comments to methods of ir_variable_refcount_visitor

It was not obvious from the just the .h file what the hash table
contained.  It was also not obvious that get_variable_entry would create
a new entry in the hash table.

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

1 files changed, 6 insertions, 0 deletions

diff --git a/src/compiler/glsl/ir_variable_refcount.h b/src/compiler/glsl/ir_variable_refcount.h
index 08a11c01495..0a8eec7a269 100644
--- a/src/compiler/glsl/ir_variable_refcount.h
+++ b/src/compiler/glsl/ir_variable_refcount.h
@@ -72,8 +72,14 @@ public:
    virtual ir_visitor_status visit_enter(ir_function_signature *);
    virtual ir_visitor_status visit_leave(ir_assignment *);
 
+   /**
+    * Find variable in the hash table, and insert it if not present
+    */
    ir_variable_refcount_entry *get_variable_entry(ir_variable *var);
 
+   /**
+    * Hash table mapping ir_variable to ir_variable_refcount_entry.
+    */
    struct hash_table *ht;
 
    void *mem_ctx;