Add a GLSL-specific facade to _mesa_symbol_table

This adds some type saftey and will enable elimination of a bunch of
type casts and other ugly crap in the code.

diff --git a/glsl_symbol_table.h b/glsl_symbol_table.h
new file mode 100644 (file)
index 0000000..482507c
--- /dev/null
+++ b/glsl_symbol_table.h
@@ -0,0 +1,109 @@
+/* -*- 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 "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 {
+public:
+   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);
+   }
+
+   /**
+    * \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, 0, name, v) == 0;
+   }
+
+   bool add_type(const char *name, const glsl_type *t)
+   {
+      return _mesa_symbol_table_add_symbol(table, 0, name, (void *) t) == 0;
+   }
+
+   bool add_function(const char *name, ir_function *f)
+   {
+      return _mesa_symbol_table_add_symbol(table, 0, 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, 0, name);
+   }
+
+   glsl_type *get_type(const char *name)
+   {
+      return (glsl_type *) _mesa_symbol_table_find_symbol(table, 0, name);
+   }
+
+   ir_function *get_function(const char *name)
+   {
+      return (ir_function *) _mesa_symbol_table_find_symbol(table, 0, name);
+   }
+   /*@}*/
+
+private:
+   struct _mesa_symbol_table *table;
+};
+
+#endif /* GLSL_SYMBOL_TABLE */