1/*
2 * Copyright © 2010 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 */
23
24/**
25 * \file ir_variable_refcount.h
26 *
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.
30 */
31
32#include "ir.h"
33#include "ir_visitor.h"
34#include "glsl_types.h"
35
36class ir_variable_refcount_entry : public exec_node
37{
38public:
39   ir_variable_refcount_entry(ir_variable *var);
40
41   ir_variable *var; /* The key: the variable's pointer. */
42   ir_assignment *assign; /* An assignment to the variable, if any */
43
44   /** Number of times the variable is referenced, including assignments. */
45   unsigned referenced_count;
46
47   /** Number of times the variable is assigned. */
48   unsigned assigned_count;
49
50   bool declaration; /* If the variable had a decl in the instruction stream */
51};
52
53class ir_variable_refcount_visitor : public ir_hierarchical_visitor {
54public:
55   ir_variable_refcount_visitor(void)
56   {
57      this->mem_ctx = ralloc_context(NULL);
58      this->variable_list.make_empty();
59   }
60
61   ~ir_variable_refcount_visitor(void)
62   {
63      ralloc_free(this->mem_ctx);
64   }
65
66   virtual ir_visitor_status visit(ir_variable *);
67   virtual ir_visitor_status visit(ir_dereference_variable *);
68
69   virtual ir_visitor_status visit_enter(ir_function_signature *);
70   virtual ir_visitor_status visit_leave(ir_assignment *);
71
72   ir_variable_refcount_entry *get_variable_entry(ir_variable *var);
73
74   /* List of ir_variable_refcount_entry */
75   exec_list variable_list;
76
77   void *mem_ctx;
78};
79