Differential D8665 Diff 28166 intern/guardedalloc/intern/leak_detector.cc

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intern/guardedalloc/intern/leak_detector.cc

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	* along with this program; if not, write to the Free Software Foundation,			* along with this program; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.			* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	*/			*/

	/** \file			/** \file
	* \ingroup MEM			* \ingroup MEM
	*/			*/

				#include <cstdlib>

	#include "MEM_guardedalloc.h"			#include "MEM_guardedalloc.h"
	#include "mallocn_intern.h"			#include "mallocn_intern.h"

	bool leak_detector_has_run = false;			bool leak_detector_has_run = false;
	char free_after_leak_detection_message[] =			char free_after_leak_detection_message[] =
	"Freeing memory after the leak detector has run. This can happen when using "			"Freeing memory after the leak detector has run. This can happen when using "
	"static variables in C++ that are defined outside of functions. To fix this "			"static variables in C++ that are defined outside of functions. To fix this "
	"error, use the 'construct on first use' idiom.";			"error, use the 'construct on first use' idiom.";

	namespace {			namespace {

				static bool fail_on_memleak = false;

	class MemLeakPrinter {			class MemLeakPrinter {
	public:			public:
	~MemLeakPrinter()			~MemLeakPrinter()
	{			{
	leak_detector_has_run = true;			leak_detector_has_run = true;
	const uint leaked_blocks = MEM_get_memory_blocks_in_use();			const uint leaked_blocks = MEM_get_memory_blocks_in_use();
	if (leaked_blocks == 0) {			if (leaked_blocks == 0) {
	return;			return;
	}			}
	const size_t mem_in_use = MEM_get_memory_in_use();			const size_t mem_in_use = MEM_get_memory_in_use();
	printf("Error: Not freed memory blocks: %u, total unfreed memory %f MB\n",			printf("Error: Not freed memory blocks: %u, total unfreed memory %f MB\n",
	leaked_blocks,			leaked_blocks,
	(double)mem_in_use / 1024 / 1024);			(double)mem_in_use / 1024 / 1024);
	MEM_printmemlist();			MEM_printmemlist();

				if (fail_on_memleak) {
				/* There are many other ways to change the exit code to failure here:
				* - Make the destructor noexcept(false) and throw an exception.
				* - Call exit(EXIT_FAILURE).
				* - Call terminate().
				*/
				abort();
				}
	}			}
	};			};
	} // namespace			} // namespace

	void MEM_init_memleak_detection(void)			void MEM_init_memleak_detection(void)
	{			{
	/**			/**
	* This variable is constructed when this function is first called. This should happen as soon as			* This variable is constructed when this function is first called. This should happen as soon as
	* possible when the program starts.			* possible when the program starts.
	*			*
	* It is destructed when the program exits. During destruction, it will print information about			* It is destructed when the program exits. During destruction, it will print information about
	* leaked memory blocks. Static variables are destructed in reversed order of their			* leaked memory blocks. Static variables are destructed in reversed order of their
	* construction. Therefore, all static variables that own memory have to be constructed after			* construction. Therefore, all static variables that own memory have to be constructed after
	* this function has been called.			* this function has been called.
	*/			*/
	static MemLeakPrinter printer;			static MemLeakPrinter printer;
	}			}

				void MEM_enable_fail_on_memleak(void)
				{
				fail_on_memleak = true;
				}