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25 * \file ir_variable_refcount.h
27 * Provides a visitor which produces a list of variables referenced,
28 * how many times they were referenced and assigned, and whether they
29 * were defined in the scope.
32 #ifndef GLSL_IR_VARIABLE_REFCOUNT_H
33 #define GLSL_IR_VARIABLE_REFCOUNT_H
36 #include "ir_visitor.h"
37 #include "compiler/glsl_types.h"
39 struct assignment_entry
{
41 ir_assignment
*assign
;
44 class ir_variable_refcount_entry
47 ir_variable_refcount_entry(ir_variable
*var
);
49 ir_variable
*var
; /* The key: the variable's pointer. */
52 * List of assignments to the variable, if any.
53 * This is intended to be used for dead code optimisation and may
54 * not be a complete list.
56 exec_list assign_list
;
58 /** Number of times the variable is referenced, including assignments. */
59 unsigned referenced_count
;
61 /** Number of times the variable is assigned. */
62 unsigned assigned_count
;
64 bool declaration
; /* If the variable had a decl in the instruction stream */
67 class ir_variable_refcount_visitor
: public ir_hierarchical_visitor
{
69 ir_variable_refcount_visitor(void);
70 ~ir_variable_refcount_visitor(void);
72 virtual ir_visitor_status
visit(ir_variable
*);
73 virtual ir_visitor_status
visit(ir_dereference_variable
*);
75 virtual ir_visitor_status
visit_enter(ir_function_signature
*);
76 virtual ir_visitor_status
visit_leave(ir_assignment
*);
79 * Find variable in the hash table, and insert it if not present
81 ir_variable_refcount_entry
*get_variable_entry(ir_variable
*var
);
84 * Hash table mapping ir_variable to ir_variable_refcount_entry.
86 struct hash_table
*ht
;
91 #endif /* GLSL_IR_VARIABLE_REFCOUNT_H */