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Telegram/lib_base/base/assertion.h

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+// This file is part of Desktop App Toolkit,
+// a set of libraries for developing nice desktop applications.
+//
+// For license and copyright information please follow this link:
+// https://github.com/desktop-app/legal/blob/master/LEGAL
+//
+#pragma once
+
+#include <cstdlib>
+
+// Ensures/Expects.
+#include <gsl/assert>
+
+namespace base {
+namespace assertion {
+
+void log(const char *message, const char *file, int line);
+
+// Release build assertions.
+inline constexpr void noop() {
+}
+
+[[noreturn]] inline void fail(
+		const char *message,
+		const char *file,
+		int line) {
+	log(message, file, line);
+
+	// Crash with access violation and generate crash report.
+	volatile auto nullptr_value = (int*)nullptr;
+	*nullptr_value = 0;
+
+	// Silent the possible failure to comply noreturn warning.
+	std::abort();
+}
+
+constexpr const char* extract_basename(const char* path, size_t size) {
+	while (size != 0 && path[size - 1] != '/' && path[size - 1] != '\\') {
+		--size;
+	}
+	return path + size;
+}
+
+} // namespace assertion
+} // namespace base
+
+#if defined(__clang__) || defined(__GNUC__)
+#define AssertUnlikelyHelper(x) __builtin_expect(!!(x), 0)
+#else
+#define AssertUnlikelyHelper(x) (!!(x))
+#endif
+
+#define AssertValidationCondition(condition, message, file, line)\
+	((AssertUnlikelyHelper(!(condition)))\
+		? ::base::assertion::fail(message, file, line)\
+		: ::base::assertion::noop())
+
+#define SOURCE_FILE_BASENAME (::base::assertion::extract_basename(\
+	__FILE__,\
+	sizeof(__FILE__)))
+
+#define AssertCustom(condition, message) (AssertValidationCondition(\
+	condition,\
+	message,\
+	SOURCE_FILE_BASENAME,\
+	__LINE__))
+#define Assert(condition) AssertCustom(condition, "\"" #condition "\"")
+
+// Define our own versions of Expects() and Ensures().
+// Let them crash with reports and logging.
+#ifdef Expects
+#undef Expects
+#endif // Expects
+#define Expects(condition) (AssertValidationCondition(\
+	condition,\
+	"\"" #condition "\"",\
+	SOURCE_FILE_BASENAME,\
+	__LINE__))
+
+#ifdef Ensures
+#undef Ensures
+#endif // Ensures
+#define Ensures(condition) (AssertValidationCondition(\
+	condition,\
+	"\"" #condition "\"",\
+	SOURCE_FILE_BASENAME,\
+	__LINE__))
+
+#ifdef Unexpected
+#undef Unexpected
+#endif // Unexpected
+#define Unexpected(message) (::base::assertion::fail(\
+	"Unexpected: " message,\
+	SOURCE_FILE_BASENAME,\
+	__LINE__))
+
+#ifdef _DEBUG
+#define AssertIsDebug(...)
+#endif // _DEBUG