1 files changed, 104 insertions, 0 deletions
diff --git a/src/glsl/ir_validate.cpp b/src/glsl/ir_validate.cpp
new file mode 100644
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+++ b/src/glsl/ir_validate.cpp
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+/*
+ * 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.
+ */
+
+/**
+ * \file ir_validate.cpp
+ *
+ * Attempts to verify that various invariants of the IR tree are true.
+ *
+ * In particular, at the moment it makes sure that no single
+ * ir_instruction node except for ir_variable appears multiple times
+ * in the ir tree.  ir_variable does appear multiple times: Once as a
+ * declaration in an exec_list, and multiple times as the endpoint of
+ * a dereference chain.
+ */
+
+#include <inttypes.h>
+#include "ir.h"
+#include "ir_hierarchical_visitor.h"
+#include "hash_table.h"
+
+static unsigned int hash_func(const void *key)
+{
+   return (unsigned int)(uintptr_t)key;
+}
+
+static int hash_compare_func(const void *key1, const void *key2)
+{
+   return key1 == key2 ? 0 : 1;
+}
+
+
+class ir_validate : public ir_hierarchical_visitor {
+public:
+   ir_validate()
+   {
+      this->ht = hash_table_ctor(0, hash_func, hash_compare_func);
+
+      this->callback = ir_validate::validate_ir;
+      this->data = ht;
+   }
+
+   ~ir_validate()
+   {
+      hash_table_dtor(this->ht);
+   }
+
+   virtual ir_visitor_status visit(ir_variable *v);
+
+   static void validate_ir(ir_instruction *ir, void *data);
+
+   struct hash_table *ht;
+};
+
+ir_visitor_status
+ir_validate::visit(ir_variable *ir)
+{
+   /* An ir_variable is the one thing that can (and will) appear multiple times
+    * in an IR tree.
+    */
+   (void) ir;
+   return visit_continue;
+}
+
+void
+ir_validate::validate_ir(ir_instruction *ir, void *data)
+{
+   struct hash_table *ht = (struct hash_table *) data;
+
+   if (hash_table_find(ht, ir)) {
+      printf("Instruction node present twice in ir tree:\n");
+      ir->print();
+      printf("\n");
+      abort();
+   }
+   hash_table_insert(ht, ir, ir);
+}
+
+void
+validate_ir_tree(exec_list *instructions)
+{
+   ir_validate v;
+
+   v.run(instructions);
+}