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-rw-r--r--layout/base/LayoutLogging.h64
1 files changed, 64 insertions, 0 deletions
diff --git a/layout/base/LayoutLogging.h b/layout/base/LayoutLogging.h
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+++ b/layout/base/LayoutLogging.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef LayoutLogging_h
+#define LayoutLogging_h
+
+#include "mozilla/Logging.h"
+
+/**
+ * Retrieves the log module to use for layout logging.
+ */
+static mozilla::LazyLogModule sLayoutLog("layout");
+
+/**
+ * Use the layout log to warn if a given condition is false.
+ *
+ * This is only enabled in debug builds and the logging is only displayed if
+ * the environmental variable MOZ_LOG includes "layout:2" (or higher).
+ */
+#ifdef DEBUG
+# define LAYOUT_WARN_IF_FALSE(_cond, _msg) \
+ PR_BEGIN_MACRO \
+ if (MOZ_LOG_TEST(sLayoutLog, mozilla::LogLevel::Warning) && !(_cond)) { \
+ mozilla::detail::LayoutLogWarning(_msg, #_cond, __FILE__, __LINE__); \
+ } \
+ PR_END_MACRO
+#else
+# define LAYOUT_WARN_IF_FALSE(_cond, _msg) \
+ PR_BEGIN_MACRO \
+ PR_END_MACRO
+#endif
+
+/**
+ * Use the layout log to emit a warning with the same format as NS_WARNING.
+ *
+ * This is only enabled in debug builds and the logging is only displayed if
+ * the environmental variable MOZ_LOG includes "layout:2" (or higher).
+ */
+#ifdef DEBUG
+# define LAYOUT_WARNING(_msg) \
+ PR_BEGIN_MACRO \
+ if (MOZ_LOG_TEST(sLayoutLog, mozilla::LogLevel::Warning)) { \
+ mozilla::detail::LayoutLogWarning(_msg, nullptr, __FILE__, __LINE__); \
+ } \
+ PR_END_MACRO
+#else
+# define LAYOUT_WARNING(_msg) \
+ PR_BEGIN_MACRO \
+ PR_END_MACRO
+#endif
+
+namespace mozilla {
+namespace detail {
+
+void LayoutLogWarning(const char* aStr, const char* aExpr, const char* aFile,
+ int32_t aLine);
+
+} // namespace detail
+} // namespace mozilla
+
+#endif // LayoutLogging_h