Added slow_assert macro and flag for slow development assertions in the VM.

runtime/vm/assert.h

Index: runtime/vm/assert.h
diff --git a/runtime/vm/assert.h b/runtime/vm/assert.h
new file mode 100644
index 0000000000000000000000000000000000000000..7985bc5528f26beff67a9a689842e7b50b054192
--- /dev/null
+++ b/runtime/vm/assert.h
@@ -0,0 +1,24 @@
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.

[siva, 2012/10/01 23:35:40]

I think it is not a good idea to add this file as we will end up with multiple
versions of assert.h and it can be very confusing.

+
+#ifndef VM_ASSERT_H_
+#define VM_ASSERT_H_
+
+#include "platform/assert.h"
+#include "vm/flags.h"
+
+namespace dart {
+
+DECLARE_FLAG(bool, slow_asserts);
+
+// SLOW_ASSERT is used for slow assertion code and disabled by default.
+#if defined(DEBUG)
+#define SLOW_ASSERT(cond) ASSERT(!FLAG_slow_asserts || (cond))
+#else
+#define SLOW_ASSERT(cond)
+#endif

[siva, 2012/10/01 23:35:40]

I don't quite understand the need for a VM wide SLOW_ASSERT macro. We want to
run with ASSERT on all the time in many parts of the VM.

+
+}  // namespace dart
+
+#endif  // VM_ASSERT_H_