src/glsl/glsl_symbol_table.h

   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 #pragma once
  26 #ifndef GLSL_SYMBOL_TABLE
  27 #define GLSL_SYMBOL_TABLE
  28
  29 #include <new>
  30
  31 extern "C" {
  32 #include "program/symbol_table.h"
  33 }
  34 #include "ir.h"
  35 #include "glsl_types.h"
  36
  37 /**
  38  * Facade class for _mesa_symbol_table
  39  *
  40  * Wraps the existing \c _mesa_symbol_table data structure to enforce some
  41  * type safe and some symbol table invariants.
  42  */
  43 class glsl_symbol_table {
  44 private:
  45    enum glsl_symbol_name_space {
  46       glsl_variable_name_space = 0,
  47       glsl_type_name_space = 1,
  48       glsl_function_name_space = 2
  49    };
  50
  51    static int
  52    _glsl_symbol_table_destructor (glsl_symbol_table *table)
  53    {
  54       table->~glsl_symbol_table();
  55
  56       return 0;
  57    }
  58
  59 public:
  60    /* Callers of this talloc-based new need not call delete. It's
  61     * easier to just talloc_free 'ctx' (or any of its ancestors). */
  62    static void* operator new(size_t size, void *ctx)
  63    {
  64       void *table;
  65
  66       table = talloc_size(ctx, size);
  67       assert(table != NULL);
  68
  69       talloc_set_destructor(table, (int (*)(void*)) _glsl_symbol_table_destructor);
  70
  71       return table;
  72    }
  73
  74    /* If the user *does* call delete, that's OK, we will just
  75     * talloc_free in that case. Here, C++ will have already called the
  76     * destructor so tell talloc not to do that again. */
  77    static void operator delete(void *table)
  78    {
  79       talloc_set_destructor(table, NULL);
  80       talloc_free(table);
  81    }
  82
  83    glsl_symbol_table()
  84    {
  85       table = _mesa_symbol_table_ctor();
  86    }
  87
  88    ~glsl_symbol_table()
  89    {
  90       _mesa_symbol_table_dtor(table);
  91    }
  92
  93    void push_scope()
  94    {
  95       _mesa_symbol_table_push_scope(table);
  96    }
  97
  98    void pop_scope()
  99    {
 100       _mesa_symbol_table_pop_scope(table);
 101    }
 102
 103    /**
 104     * Determine whether a name was declared at the current scope
 105     */
 106    bool name_declared_this_scope(const char *name)
 107    {
 108       return _mesa_symbol_table_symbol_scope(table, -1, name) == 0;
 109    }
 110
 111    /**
 112     * \name Methods to add symbols to the table
 113     *
 114     * There is some temptation to rename all these functions to \c add_symbol
 115     * or similar.  However, this breaks symmetry with the getter functions and
 116     * reduces the clarity of the intention of code that uses these methods.
 117     */
 118    /*@{*/
 119    bool add_variable(const char *name, ir_variable *v)
 120    {
 121       return _mesa_symbol_table_add_symbol(table, glsl_variable_name_space,
 122                                            name, v) == 0;
 123    }
 124
 125    bool add_type(const char *name, const glsl_type *t)
 126    {
 127       return _mesa_symbol_table_add_symbol(table, glsl_type_name_space,
 128                                            name, (void *) t) == 0;
 129    }
 130
 131    bool add_function(const char *name, ir_function *f)
 132    {
 133       return _mesa_symbol_table_add_symbol(table, glsl_function_name_space,
 134                                            name, f) == 0;
 135    }
 136    /*@}*/
 137
 138    /**
 139     * \name Methods to get symbols from the table
 140     */
 141    /*@{*/
 142    ir_variable *get_variable(const char *name)
 143    {
 144       return (ir_variable *)
 145          _mesa_symbol_table_find_symbol(table, glsl_variable_name_space, name);
 146    }
 147
 148    glsl_type *get_type(const char *name)
 149    {
 150       return (glsl_type *)
 151          _mesa_symbol_table_find_symbol(table, glsl_type_name_space, name);
 152    }
 153
 154    ir_function *get_function(const char *name)
 155    {
 156       return (ir_function *)
 157          _mesa_symbol_table_find_symbol(table, glsl_function_name_space, name);
 158    }
 159    /*@}*/
 160
 161 private:
 162    struct _mesa_symbol_table *table;
 163 };
 164
 165 #endif /* GLSL_SYMBOL_TABLE */