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1 /* -*- c++ -*- */
2 /*
3  * Copyright © 2010 Intel Corporation
4  *
5  * Permission is hereby granted, free of charge, to any person obtaining a
6  * copy of this software and associated documentation files (the "Software"),
7  * to deal in the Software without restriction, including without limitation
8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9  * and/or sell copies of the Software, and to permit persons to whom the
10  * Software is furnished to do so, subject to the following conditions:
11  *
12  * The above copyright notice and this permission notice (including the next
13  * paragraph) shall be included in all copies or substantial portions of the
14  * Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22  * DEALINGS IN THE SOFTWARE.
23  */
24 
25 #ifndef GLSL_SYMBOL_TABLE
26 #define GLSL_SYMBOL_TABLE
27 
28 #include <new>
29 
30 #include "program/symbol_table.h"
31 #include "ir.h"
32 
33 class symbol_table_entry;
34 struct glsl_type;
35 
36 /**
37  * Facade class for _mesa_symbol_table
38  *
39  * Wraps the existing \c _mesa_symbol_table data structure to enforce some
40  * type safe and some symbol table invariants.
41  */
42 struct glsl_symbol_table {
43    DECLARE_RALLOC_CXX_OPERATORS(glsl_symbol_table)
44 
45    glsl_symbol_table();
46    ~glsl_symbol_table();
47 
48    /* In 1.10, functions and variables have separate namespaces. */
49    bool separate_function_namespace;
50 
51    void push_scope();
52    void pop_scope();
53 
54    /**
55     * Determine whether a name was declared at the current scope
56     */
57    bool name_declared_this_scope(const char *name);
58 
59    /**
60     * \name Methods to add symbols to the table
61     *
62     * There is some temptation to rename all these functions to \c add_symbol
63     * or similar.  However, this breaks symmetry with the getter functions and
64     * reduces the clarity of the intention of code that uses these methods.
65     */
66    /*@{*/
67    bool add_variable(ir_variable *v);
68    bool add_type(const char *name, const glsl_type *t);
69    bool add_function(ir_function *f);
70    bool add_interface(const char *name, const glsl_type *i,
71                       enum ir_variable_mode mode);
72    bool add_default_precision_qualifier(const char *type_name, int precision);
73    /*@}*/
74 
75    /**
76     * Add an function at global scope without checking for scoping conflicts.
77     */
78    void add_global_function(ir_function *f);
79 
80    /**
81     * \name Methods to get symbols from the table
82     */
83    /*@{*/
84    ir_variable *get_variable(const char *name);
85    const glsl_type *get_type(const char *name);
86    ir_function *get_function(const char *name);
87    const glsl_type *get_interface(const char *name,
88                                   enum ir_variable_mode mode);
89    int get_default_precision_qualifier(const char *type_name);
90    /*@}*/
91 
92    /**
93     * Disable a previously-added variable so that it no longer appears to be
94     * in the symbol table.  This is necessary when gl_PerVertex is redeclared,
95     * to ensure that previously-available built-in variables are no longer
96     * available.
97     */
98    void disable_variable(const char *name);
99 
100    /**
101     * Replaces the variable in the entry by the new variable.
102     */
103    void replace_variable(const char *name, ir_variable *v);
104 
105 private:
106    symbol_table_entry *get_entry(const char *name);
107 
108    struct _mesa_symbol_table *table;
109    void *mem_ctx;
110    void *linalloc;
111 };
112 
113 #endif /* GLSL_SYMBOL_TABLE */
114