From cbc2639aec361e3832cc1adfc28079b49a89f0ad Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris+github@qwirx.com>
Date: Mon, 23 Jan 2012 01:32:08 +0000
Subject: Allow overriding Logging::Guard to dump stack backtraces as well.

---
 lib/common/Box.h       | 20 ++++++++++++++++++--
 lib/common/Logging.cpp |  3 +++
 lib/common/Logging.h   | 16 ++++++++++++++++
 3 files changed, 37 insertions(+), 2 deletions(-)

(limited to 'lib/common')

diff --git a/lib/common/Box.h b/lib/common/Box.h
index 4a30891a..6ef797be 100644
--- a/lib/common/Box.h
+++ b/lib/common/Box.h
@@ -17,6 +17,8 @@
 
 #include "BoxPlatform.h"
 
+#include <memory>
+
 // uncomment this line to enable full memory leak finding on all
 // malloc-ed blocks (at least, ones used by the STL)
 //#define MEMLEAKFINDER_FULL_MALLOC_MONITORING
@@ -104,8 +106,15 @@
 #define THROW_EXCEPTION(type, subtype) \
 	{ \
 		if(!HideExceptionMessageGuard::ExceptionsHidden() \
-			|| Logging::IsEnabled(Log::EVERYTHING)) \
+			|| Logging::Guard::IsGuardingFrom(Log::EVERYTHING)) \
 		{ \
+			std::auto_ptr<Logging::Guard> guard; \
+			\
+			if(Logging::Guard::IsGuardingFrom(Log::EVERYTHING)) \
+			{ \
+				guard.reset(new Logging::Guard(Log::EVERYTHING)); \
+			} \
+			\
 			OPTIONAL_DO_BACKTRACE \
 			BOX_WARNING("Exception thrown: " \
 				#type "(" #subtype ") " \
@@ -119,8 +128,15 @@
 		std::ostringstream _box_throw_line; \
 		_box_throw_line << message; \
 		if(!HideExceptionMessageGuard::ExceptionsHidden() \
-			|| Logging::IsEnabled(Log::EVERYTHING)) \
+			|| Logging::Guard::IsGuardingFrom(Log::EVERYTHING)) \
 		{ \
+			std::auto_ptr<Logging::Guard> guard; \
+			\
+			if(Logging::Guard::IsGuardingFrom(Log::EVERYTHING)) \
+			{ \
+				guard.reset(new Logging::Guard(Log::EVERYTHING)); \
+			} \
+			\
 			OPTIONAL_DO_BACKTRACE \
 			BOX_WARNING("Exception thrown: " \
 				#type "(" #subtype ") (" << message << \
diff --git a/lib/common/Logging.cpp b/lib/common/Logging.cpp
index f7f72713..f0cf74b4 100644
--- a/lib/common/Logging.cpp
+++ b/lib/common/Logging.cpp
@@ -46,6 +46,9 @@ Log::Level  Logging::sGlobalLevel = Log::EVERYTHING;
 Logging     Logging::sGlobalLogging; //automatic initialisation
 std::string Logging::sProgramName;
 
+int Logging::Guard::sGuardCount = 0;
+Log::Level Logging::Guard::sOriginalLevel = Log::INVALID;
+
 Logging::Logging()
 {
 	ASSERT(!spConsole);
diff --git a/lib/common/Logging.h b/lib/common/Logging.h
index 4ddf760d..1fcbe59e 100644
--- a/lib/common/Logging.h
+++ b/lib/common/Logging.h
@@ -303,17 +303,33 @@ class Logging
 	{
 		private:
 		Log::Level mOldLevel;
+		static int sGuardCount;
+		static Log::Level sOriginalLevel;
 
 		public:
 		Guard(Log::Level newLevel)
 		{
 			mOldLevel = Logging::GetGlobalLevel();
+			if(sGuardCount == 0)
+			{
+				sOriginalLevel = mOldLevel;
+			}
+			sGuardCount++;
 			Logging::SetGlobalLevel(newLevel);
 		}
 		~Guard()
 		{
+			sGuardCount--;
 			Logging::SetGlobalLevel(mOldLevel);
 		}
+
+		static bool IsActive() { return (sGuardCount > 0); }
+		static Log::Level GetOriginalLevel() { return sOriginalLevel; }
+		static bool IsGuardingFrom(Log::Level originalLevel)
+		{
+			return IsActive() &&
+				(int)sOriginalLevel >= (int)originalLevel;
+		}
 	};
 
 	class Tagger
-- 
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