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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 
36 class variable_entry : public exec_node
37 {
38 public:
39    variable_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 
53 class ir_variable_refcount_visitor : public ir_hierarchical_visitor {
54 public:
ir_variable_refcount_visitor(void)55    ir_variable_refcount_visitor(void)
56    {
57       this->mem_ctx = hieralloc_new(NULL);
58       this->variable_list.make_empty();
59    }
60 
~ir_variable_refcount_visitor(void)61    ~ir_variable_refcount_visitor(void)
62    {
63       hieralloc_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    variable_entry *get_variable_entry(ir_variable *var);
73 
74    /* List of variable_entry */
75    exec_list variable_list;
76 
77    void *mem_ctx;
78 };
79