Move folly/SafeAssert.h

[folly.git] / folly / lang / SafeAssert.h

diff --git a/folly/lang/SafeAssert.h b/folly/lang/SafeAssert.h
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+/*
+ * Copyright 2017 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <folly/Portability.h>
+#include <folly/Preprocessor.h>
+
+/**
+ * Verify that the expression is true. If not, prints an error message
+ * (containing msg) to stderr and abort()s. Just like CHECK(), but only
+ * logs to stderr and only does async-signal-safe calls.
+ */
+#define FOLLY_SAFE_CHECK_IMPL(expr, expr_s, msg) \
+  ((expr) ? static_cast<void>(0) : \
+   ::folly::detail::assertionFailure( \
+       FB_STRINGIZE(expr_s), (msg), __FILE__, __LINE__, __PRETTY_FUNCTION__))
+#define FOLLY_SAFE_CHECK(expr, msg) FOLLY_SAFE_CHECK_IMPL((expr), (expr), (msg))
+
+/**
+ * In debug mode, verify that the expression is true. Otherwise, do nothing
+ * (do not even evaluate expr). Just like DCHECK(), but only logs to stderr and
+ * only does async-signal-safe calls.
+ */
+#define FOLLY_SAFE_DCHECK(expr, msg) \
+  FOLLY_SAFE_CHECK_IMPL(!folly::kIsDebug || (expr), (expr), (msg))
+
+namespace folly { namespace detail {
+
+[[noreturn]] void assertionFailure(
+    const char* expr,
+    const char* msg,
+    const char* file,
+    unsigned int line,
+    const char* function);
+} // namespace detail
+} // namespace folly