modplug-svn-commit

[<sv...@op...>]

Author: manx
Date: Fri May 10 15:39:12 2024
New Revision: 20750
URL: https://source.openmpt.org/browse/openmpt/?op=revision&rev=20750

Log:
[Imp] mptRandom: Add reinit_global_random() function for fuzzer builds to allow deterministic consecutive fuzzer runs in the same process.

Modified:
   trunk/OpenMPT/common/mptRandom.cpp
   trunk/OpenMPT/common/mptRandom.h

Modified: trunk/OpenMPT/common/mptRandom.cpp
==============================================================================
--- trunk/OpenMPT/common/mptRandom.cpp	Fri May 10 15:32:21 2024	(r20749)
+++ trunk/OpenMPT/common/mptRandom.cpp	Fri May 10 15:39:12 2024	(r20750)
@@ -69,6 +69,16 @@
 	return g_global_prng;
 }
 
+#ifdef MPT_BUILD_FUZZER
+void reinit_global_random()
+{
+	global_prng().~thread_safe_prng<mpt::default_prng>();
+	global_random_device().~random_device();
+	new(&global_random_device()) mpt::random_device{};
+	new(&global_prng()) thread_safe_prng<mpt::default_prng>{global_random_device()};
+}
+#endif  // MPT_BUILD_FUZZER
+
 #endif // MODPLUG_TRACKER && !MPT_BUILD_WINESUPPORT
 
 } // namespace mpt

Modified: trunk/OpenMPT/common/mptRandom.h
==============================================================================
--- trunk/OpenMPT/common/mptRandom.h	Fri May 10 15:32:21 2024	(r20749)
+++ trunk/OpenMPT/common/mptRandom.h	Fri May 10 15:39:12 2024	(r20750)
@@ -128,6 +128,10 @@
 mpt::random_device & global_random_device();
 mpt::thread_safe_prng<mpt::default_prng> & global_prng();
 
+#ifdef MPT_BUILD_FUZZER
+void reinit_global_random();
+#endif  // MPT_BUILD_FUZZER
+
 #if defined(MODPLUG_TRACKER) && !defined(MPT_BUILD_WINESUPPORT)
 void set_global_random_device(mpt::random_device *rd);
 void set_global_prng(mpt::thread_safe_prng<mpt::default_prng> *rng);