1 files changed, 163 insertions, 0 deletions
diff --git a/src/glsl/glsl_symbol_table.h b/src/glsl/glsl_symbol_table.h
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+++ b/src/glsl/glsl_symbol_table.h
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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>
+
+#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 */