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25 * \file ir_variable_refcount.cpp
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.
33 #include "ir_visitor.h"
34 #include "ir_variable_refcount.h"
35 #include "glsl_types.h"
36 #include "main/hash_table.h"
38 ir_variable_refcount_visitor::ir_variable_refcount_visitor()
40 this->mem_ctx
= ralloc_context(NULL
);
41 this->ht
= _mesa_hash_table_create(NULL
, _mesa_key_pointer_equal
);
45 free_entry(struct hash_entry
*entry
)
47 ir_variable_refcount_entry
*ivre
= (ir_variable_refcount_entry
*) entry
->data
;
51 ir_variable_refcount_visitor::~ir_variable_refcount_visitor()
53 ralloc_free(this->mem_ctx
);
54 _mesa_hash_table_destroy(this->ht
, free_entry
);
58 ir_variable_refcount_entry::ir_variable_refcount_entry(ir_variable
*var
)
68 ir_variable_refcount_entry
*
69 ir_variable_refcount_visitor::get_variable_entry(ir_variable
*var
)
73 struct hash_entry
*e
= _mesa_hash_table_search(this->ht
,
74 _mesa_hash_pointer(var
),
77 return (ir_variable_refcount_entry
*)e
->data
;
79 ir_variable_refcount_entry
*entry
= new ir_variable_refcount_entry(var
);
80 assert(entry
->referenced_count
== 0);
81 _mesa_hash_table_insert(this->ht
, _mesa_hash_pointer(var
), var
, entry
);
88 ir_variable_refcount_visitor::visit(ir_variable
*ir
)
90 ir_variable_refcount_entry
*entry
= this->get_variable_entry(ir
);
92 entry
->declaration
= true;
94 return visit_continue
;
99 ir_variable_refcount_visitor::visit(ir_dereference_variable
*ir
)
101 ir_variable
*const var
= ir
->variable_referenced();
102 ir_variable_refcount_entry
*entry
= this->get_variable_entry(var
);
105 entry
->referenced_count
++;
107 return visit_continue
;
112 ir_variable_refcount_visitor::visit_enter(ir_function_signature
*ir
)
114 /* We don't want to descend into the function parameters and
115 * dead-code eliminate them, so just accept the body here.
117 visit_list_elements(this, &ir
->body
);
118 return visit_continue_with_parent
;
123 ir_variable_refcount_visitor::visit_leave(ir_assignment
*ir
)
125 ir_variable_refcount_entry
*entry
;
126 entry
= this->get_variable_entry(ir
->lhs
->variable_referenced());
128 entry
->assigned_count
++;
129 if (entry
->assign
== NULL
)
133 return visit_continue
;