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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 */