1 files changed, 160 insertions, 0 deletions
diff --git a/mesalib/src/glsl/glsl_symbol_table.cpp b/mesalib/src/glsl/glsl_symbol_table.cpp
new file mode 100644
index 000000000..e9bf89b95
--- /dev/null
+++ b/mesalib/src/glsl/glsl_symbol_table.cpp
@@ -0,0 +1,160 @@
+/* -*- 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.
+ */
+
+#include "glsl_symbol_table.h"
+
+class symbol_table_entry {
+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 *entry = talloc_size(ctx, size);
+      assert(entry != NULL);
+      return entry;
+   }
+
+   /* 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);
+   }
+
+   symbol_table_entry(ir_variable *v)                     : v(v), f(0), t(0) {}
+   symbol_table_entry(ir_function *f)                     : v(0), f(f), t(0) {}
+   symbol_table_entry(const glsl_type *t)                 : v(0), f(0), t(t) {}
+
+   ir_variable *v;
+   ir_function *f;
+   const glsl_type *t;
+};
+
+glsl_symbol_table::glsl_symbol_table()
+{
+   this->language_version = 120;
+   this->table = _mesa_symbol_table_ctor();
+   this->mem_ctx = talloc_init("symbol table entries");
+}
+
+glsl_symbol_table::~glsl_symbol_table()
+{
+   _mesa_symbol_table_dtor(table);
+   talloc_free(mem_ctx);
+}
+
+void glsl_symbol_table::push_scope()
+{
+   _mesa_symbol_table_push_scope(table);
+}
+
+void glsl_symbol_table::pop_scope()
+{
+   _mesa_symbol_table_pop_scope(table);
+}
+
+bool glsl_symbol_table::name_declared_this_scope(const char *name)
+{
+   return _mesa_symbol_table_symbol_scope(table, -1, name) == 0;
+}
+
+bool glsl_symbol_table::add_variable(const char *name, ir_variable *v)
+{
+   if (this->language_version == 110) {
+      /* In 1.10, functions and variables have separate namespaces. */
+      symbol_table_entry *existing = get_entry(name);
+      if (name_declared_this_scope(name)) {
+	 /* If there's already an existing function (not a constructor!) in
+	  * the current scope, just update the existing entry to include 'v'.
+	  */
+	 if (existing->v == NULL && existing->t == NULL) {
+	    existing->v = v;
+	    return true;
+	 }
+      } else {
+	 /* If not declared at this scope, add a new entry.  But if an existing
+	  * entry includes a function, propagate that to this block - otherwise
+	  * the new variable declaration would shadow the function.
+	  */
+	 symbol_table_entry *entry = new(mem_ctx) symbol_table_entry(v);
+	 if (existing != NULL)
+	    entry->f = existing->f;
+	 int added = _mesa_symbol_table_add_symbol(table, -1, name, entry);
+	 assert(added == 0);
+	 (void)added;
+	 return true;
+      }
+      return false;
+   }
+
+   /* 1.20+ rules: */
+   symbol_table_entry *entry = new(mem_ctx) symbol_table_entry(v);
+   return _mesa_symbol_table_add_symbol(table, -1, name, entry) == 0;
+}
+
+bool glsl_symbol_table::add_type(const char *name, const glsl_type *t)
+{
+   symbol_table_entry *entry = new(mem_ctx) symbol_table_entry(t);
+   return _mesa_symbol_table_add_symbol(table, -1, name, entry) == 0;
+}
+
+bool glsl_symbol_table::add_function(const char *name, ir_function *f)
+{
+   if (this->language_version == 110 && name_declared_this_scope(name)) {
+      /* In 1.10, functions and variables have separate namespaces. */
+      symbol_table_entry *existing = get_entry(name);
+      if ((existing->f == NULL) && (existing->t == NULL)) {
+	 existing->f = f;
+	 return true;
+      }
+   }
+   symbol_table_entry *entry = new(mem_ctx) symbol_table_entry(f);
+   return _mesa_symbol_table_add_symbol(table, -1, name, entry) == 0;
+}
+
+ir_variable *glsl_symbol_table::get_variable(const char *name)
+{
+   symbol_table_entry *entry = get_entry(name);
+   return entry != NULL ? entry->v : NULL;
+}
+
+const glsl_type *glsl_symbol_table::get_type(const char *name)
+{
+   symbol_table_entry *entry = get_entry(name);
+   return entry != NULL ? entry->t : NULL;
+}
+
+ir_function *glsl_symbol_table::get_function(const char *name)
+{
+   symbol_table_entry *entry = get_entry(name);
+   return entry != NULL ? entry->f : NULL;
+}
+
+symbol_table_entry *glsl_symbol_table::get_entry(const char *name)
+{
+   return (symbol_table_entry *)
+      _mesa_symbol_table_find_symbol(table, -1, name);
+}