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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 "util/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_hash_pointer
,
42 _mesa_key_pointer_equal
);
46 free_entry(struct hash_entry
*entry
)
48 ir_variable_refcount_entry
*ivre
= (ir_variable_refcount_entry
*) entry
->data
;
52 ir_variable_refcount_visitor::~ir_variable_refcount_visitor()
54 ralloc_free(this->mem_ctx
);
55 _mesa_hash_table_destroy(this->ht
, free_entry
);
59 ir_variable_refcount_entry::ir_variable_refcount_entry(ir_variable
*var
)
69 ir_variable_refcount_entry
*
70 ir_variable_refcount_visitor::get_variable_entry(ir_variable
*var
)
74 struct hash_entry
*e
= _mesa_hash_table_search(this->ht
, var
);
76 return (ir_variable_refcount_entry
*)e
->data
;
78 ir_variable_refcount_entry
*entry
= new ir_variable_refcount_entry(var
);
79 assert(entry
->referenced_count
== 0);
80 _mesa_hash_table_insert(this->ht
, var
, entry
);
87 ir_variable_refcount_visitor::visit(ir_variable
*ir
)
89 ir_variable_refcount_entry
*entry
= this->get_variable_entry(ir
);
91 entry
->declaration
= true;
93 return visit_continue
;
98 ir_variable_refcount_visitor::visit(ir_dereference_variable
*ir
)
100 ir_variable
*const var
= ir
->variable_referenced();
101 ir_variable_refcount_entry
*entry
= this->get_variable_entry(var
);
104 entry
->referenced_count
++;
106 return visit_continue
;
111 ir_variable_refcount_visitor::visit_enter(ir_function_signature
*ir
)
113 /* We don't want to descend into the function parameters and
114 * dead-code eliminate them, so just accept the body here.
116 visit_list_elements(this, &ir
->body
);
117 return visit_continue_with_parent
;
122 ir_variable_refcount_visitor::visit_leave(ir_assignment
*ir
)
124 ir_variable_refcount_entry
*entry
;
125 entry
= this->get_variable_entry(ir
->lhs
->variable_referenced());
127 entry
->assigned_count
++;
128 if (entry
->assign
== NULL
)
132 return visit_continue
;