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/* -*- c++ -*- */
/*
* Copyright © 2010 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#pragma once
#ifndef GLSL_SYMBOL_TABLE
#define GLSL_SYMBOL_TABLE
#include <new>
extern "C" {
#include "symbol_table.h"
}
#include "ir.h"
#include "glsl_types.h"
/**
* Facade class for _mesa_symbol_table
*
* Wraps the existing \c _mesa_symbol_table data structure to enforce some
* type safe and some symbol table invariants.
*/
class glsl_symbol_table {
private:
enum glsl_symbol_name_space {
glsl_variable_name_space = 0,
glsl_type_name_space = 1,
glsl_function_name_space = 2
};
static int
_glsl_symbol_table_destructor (glsl_symbol_table *table)
{
table->~glsl_symbol_table();
return 0;
}
public:
/* Callers of this talloc-based new need not call delete. It's
* easier to just talloc_free 'ctx' (or any of its ancestors). */
static void* operator new(size_t size, void *ctx)
{
void *table;
table = talloc_size(ctx, size);
assert(table != NULL);
talloc_set_destructor(table, (int (*)(void*)) _glsl_symbol_table_destructor);
return table;
}
/* If the user *does* call delete, that's OK, we will just
* talloc_free in that case. Here, C++ will have already called the
* destructor so tell talloc not to do that again. */
static void operator delete(void *table)
{
talloc_set_destructor(table, NULL);
talloc_free(table);
}
glsl_symbol_table()
{
table = _mesa_symbol_table_ctor();
}
~glsl_symbol_table()
{
_mesa_symbol_table_dtor(table);
}
void push_scope()
{
_mesa_symbol_table_push_scope(table);
}
void pop_scope()
{
_mesa_symbol_table_pop_scope(table);
}
/**
* Determine whether a name was declared at the current scope
*/
bool name_declared_this_scope(const char *name)
{
return _mesa_symbol_table_symbol_scope(table, -1, name) == 0;
}
/**
* \name Methods to add symbols to the table
*
* There is some temptation to rename all these functions to \c add_symbol
* or similar. However, this breaks symmetry with the getter functions and
* reduces the clarity of the intention of code that uses these methods.
*/
/*@{*/
bool add_variable(const char *name, ir_variable *v)
{
return _mesa_symbol_table_add_symbol(table, glsl_variable_name_space,
name, v) == 0;
}
bool add_type(const char *name, const glsl_type *t)
{
return _mesa_symbol_table_add_symbol(table, glsl_type_name_space,
name, (void *) t) == 0;
}
bool add_function(const char *name, ir_function *f)
{
return _mesa_symbol_table_add_symbol(table, glsl_function_name_space,
name, f) == 0;
}
/*@}*/
/**
* \name Methods to get symbols from the table
*/
/*@{*/
ir_variable *get_variable(const char *name)
{
return (ir_variable *)
_mesa_symbol_table_find_symbol(table, glsl_variable_name_space, name);
}
glsl_type *get_type(const char *name)
{
return (glsl_type *)
_mesa_symbol_table_find_symbol(table, glsl_type_name_space, name);
}
ir_function *get_function(const char *name)
{
return (ir_function *)
_mesa_symbol_table_find_symbol(table, glsl_function_name_space, name);
}
/*@}*/
private:
struct _mesa_symbol_table *table;
};
#endif /* GLSL_SYMBOL_TABLE */
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