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+// Copyright 2010 The Kyua Authors.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+//   notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright
+//   notice, this list of conditions and the following disclaimer in the
+//   documentation and/or other materials provided with the distribution.
+// * Neither the name of Google Inc. nor the names of its contributors
+//   may be used to endorse or promote products derived from this software
+//   without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/// \file utils/sanity.hpp
+///
+/// Set of macros that replace the standard assert macro with more semantical
+/// expressivity and meaningful diagnostics.  Code should never use assert
+/// directly.
+///
+/// In general, the checks performed by the macros in this code are only
+/// executed if the code is built with debugging support (that is, if the NDEBUG
+/// macro is NOT defined).
+
+#if !defined(UTILS_SANITY_HPP)
+#define UTILS_SANITY_HPP
+
+#include "utils/sanity_fwd.hpp"
+
+#include <cstddef>
+#include <string>
+
+#include "utils/defs.hpp"
+
+namespace utils {
+
+
+void sanity_failure(const assert_type, const char*, const size_t,
+                    const std::string&) UTILS_NORETURN;
+
+
+void install_crash_handlers(const std::string&);
+
+
+}  // namespace utils
+
+
+/// \def _UTILS_ASSERT(type, expr, message)
+/// \brief Performs an assertion check.
+///
+/// This macro is internal and should not be used directly.
+///
+/// Ensures that the given expression expr is true and, if not, terminates
+/// execution by calling utils::sanity_failure().  The check is only performed
+/// in debug builds.
+///
+/// \param type The assertion type as defined by assert_type.
+/// \param expr A boolean expression.
+/// \param message A string describing the nature of the error.
+#if !defined(NDEBUG)
+#   define _UTILS_ASSERT(type, expr, message) \
+    do { \
+        if (!(expr)) \
+            utils::sanity_failure(type, __FILE__, __LINE__, message); \
+    } while (0)
+#else  // defined(NDEBUG)
+#   define _UTILS_ASSERT(type, expr, message) do {} while (0)
+#endif  // !defined(NDEBUG)
+
+
+/// Ensures that an invariant holds.
+///
+/// If the invariant does not hold, execution is immediately terminated.  The
+/// check is only performed in debug builds.
+///
+/// The error message printed by this macro is a textual representation of the
+/// boolean condition.  If you want to provide a custom error message, use
+/// INV_MSG instead.
+///
+/// \param expr A boolean expression describing the invariant.
+#define INV(expr) _UTILS_ASSERT(utils::invariant, expr, #expr)
+
+
+/// Ensures that an invariant holds using a custom error message.
+///
+/// If the invariant does not hold, execution is immediately terminated.  The
+/// check is only performed in debug builds.
+///
+/// \param expr A boolean expression describing the invariant.
+/// \param msg The error message to print if the condition is false.
+#define INV_MSG(expr, msg) _UTILS_ASSERT(utils::invariant, expr, msg)
+
+
+/// Ensures that a precondition holds.
+///
+/// If the precondition does not hold, execution is immediately terminated.  The
+/// check is only performed in debug builds.
+///
+/// The error message printed by this macro is a textual representation of the
+/// boolean condition.  If you want to provide a custom error message, use
+/// PRE_MSG instead.
+///
+/// \param expr A boolean expression describing the precondition.
+#define PRE(expr) _UTILS_ASSERT(utils::precondition, expr, #expr)
+
+
+/// Ensures that a precondition holds using a custom error message.
+///
+/// If the precondition does not hold, execution is immediately terminated.  The
+/// check is only performed in debug builds.
+///
+/// \param expr A boolean expression describing the precondition.
+/// \param msg The error message to print if the condition is false.
+#define PRE_MSG(expr, msg) _UTILS_ASSERT(utils::precondition, expr, msg)
+
+
+/// Ensures that an postcondition holds.
+///
+/// If the postcondition does not hold, execution is immediately terminated.
+/// The check is only performed in debug builds.
+///
+/// The error message printed by this macro is a textual representation of the
+/// boolean condition.  If you want to provide a custom error message, use
+/// POST_MSG instead.
+///
+/// \param expr A boolean expression describing the postcondition.
+#define POST(expr) _UTILS_ASSERT(utils::postcondition, expr, #expr)
+
+
+/// Ensures that a postcondition holds using a custom error message.
+///
+/// If the postcondition does not hold, execution is immediately terminated.
+/// The check is only performed in debug builds.
+///
+/// \param expr A boolean expression describing the postcondition.
+/// \param msg The error message to print if the condition is false.
+#define POST_MSG(expr, msg) _UTILS_ASSERT(utils::postcondition, expr, msg)
+
+
+/// Ensures that a code path is not reached.
+///
+/// If the code path in which this macro is located is reached, execution is
+/// immediately terminated.  Given that such a condition is critical for the
+/// execution of the program (and to prevent build failures due to some code
+/// paths not initializing variables, for example), this condition is fatal both
+/// in debug and production builds.
+///
+/// The error message printed by this macro is a textual representation of the
+/// boolean condition.  If you want to provide a custom error message, use
+/// POST_MSG instead.
+#define UNREACHABLE UNREACHABLE_MSG("")
+
+
+/// Ensures that a code path is not reached using a custom error message.
+///
+/// If the code path in which this macro is located is reached, execution is
+/// immediately terminated.  Given that such a condition is critical for the
+/// execution of the program (and to prevent build failures due to some code
+/// paths not initializing variables, for example), this condition is fatal both
+/// in debug and production builds.
+///
+/// \param msg The error message to print if the condition is false.
+#define UNREACHABLE_MSG(msg) \
+    do { \
+        utils::sanity_failure(utils::unreachable, __FILE__, __LINE__, msg); \
+    } while (0)
+
+
+#endif  // !defined(UTILS_SANITY_HPP)