792 "Verify all arguments to JNI calls") \
793 \
794 product(bool, UseFastJNIAccessors, true, \
795 "Use optimized versions of Get<Primitive>Field") \
796 \
797 product(intx, MaxJNILocalCapacity, 65536, \
798 "Maximum allowable local JNI handle capacity to " \
799 "EnsureLocalCapacity() and PushLocalFrame(), " \
800 "where <= 0 is unlimited, default: 65536") \
801 range(min_intx, max_intx) \
802 \
803 product(bool, EagerXrunInit, false, \
804 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
805 "but not all -Xrun libraries may support the state of the VM " \
806 "at this time") \
807 \
808 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
809 "Number of OutOfMemoryErrors preallocated with backtrace") \
810 range(0, 1024) \
811 \
812 develop(bool, PrintFieldLayout, false, \
813 "Print field layout for each class") \
814 \
815 /* Need to limit the extent of the padding to reasonable size. */\
816 /* 8K is well beyond the reasonable HW cache line size, even with */\
817 /* aggressive prefetching, while still leaving the room for segregating */\
818 /* among the distinct pages. */\
819 product(int, ContendedPaddingWidth, 128, \
820 "How many bytes to pad the fields/classes marked @Contended with")\
821 range(0, 8192) \
822 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \
823 \
824 product(bool, EnableContended, true, \
825 "Enable @Contended annotation support") \
826 \
827 product(bool, RestrictContended, true, \
828 "Restrict @Contended to trusted classes") \
829 \
830 product(int, DiagnoseSyncOnValueBasedClasses, 0, DIAGNOSTIC, \
831 "Detect and take action upon identifying synchronization on " \
832 "value based classes. Modes: " \
833 "0: off; " \
834 "1: exit with fatal error; " \
1748 "Create JMX Management Server") \
1749 \
1750 product(bool, DisableAttachMechanism, false, \
1751 "Disable mechanism that allows tools to attach to this VM") \
1752 \
1753 product(bool, StartAttachListener, false, \
1754 "Always start Attach Listener at VM startup") \
1755 \
1756 product(bool, EnableDynamicAgentLoading, true, \
1757 "Allow tools to load agents with the attach mechanism") \
1758 \
1759 product(bool, PrintConcurrentLocks, false, MANAGEABLE, \
1760 "Print java.util.concurrent locks in thread dump") \
1761 \
1762 product(bool, PrintMethodHandleStubs, false, DIAGNOSTIC, \
1763 "Print generated stub code for method handles") \
1764 \
1765 product(bool, VerifyMethodHandles, trueInDebug, DIAGNOSTIC, \
1766 "perform extra checks when constructing method handles") \
1767 \
1768 product(bool, ShowHiddenFrames, false, DIAGNOSTIC, \
1769 "show method handle implementation frames (usually hidden)") \
1770 \
1771 product(bool, ShowCarrierFrames, false, DIAGNOSTIC, \
1772 "show virtual threads' carrier frames in exceptions") \
1773 \
1774 product(bool, TrustFinalNonStaticFields, false, EXPERIMENTAL, \
1775 "trust final non-static declarations for constant folding") \
1776 \
1777 product(bool, FoldStableValues, true, DIAGNOSTIC, \
1778 "Optimize loads from stable fields (marked w/ @Stable)") \
1779 \
1780 product(int, UseBootstrapCallInfo, 1, DIAGNOSTIC, \
1781 "0: when resolving InDy or ConDy, force all BSM arguments to be " \
1782 "resolved before the bootstrap method is called; 1: when a BSM " \
1783 "that may accept a BootstrapCallInfo is detected, use that API " \
1784 "to pass BSM arguments, which allows the BSM to delay their " \
1785 "resolution; 2+: stress test the BCI API by calling more BSMs " \
1786 "via that API, instead of with the eagerly-resolved array.") \
1787 \
1919 "On internal errors, include registers in error report.") \
1920 \
1921 product(bool, UseSwitchProfiling, true, DIAGNOSTIC, \
1922 "leverage profiling for table/lookup switch") \
1923 \
1924 develop(bool, TraceMemoryWriteback, false, \
1925 "Trace memory writeback operations") \
1926 \
1927 JFR_ONLY(product(bool, FlightRecorder, false, \
1928 "(Deprecated) Enable Flight Recorder")) \
1929 \
1930 JFR_ONLY(product(ccstr, FlightRecorderOptions, nullptr, \
1931 "Flight Recorder options")) \
1932 \
1933 JFR_ONLY(product(ccstr, StartFlightRecording, nullptr, \
1934 "Start flight recording with options")) \
1935 \
1936 product(bool, UseFastUnorderedTimeStamps, false, EXPERIMENTAL, \
1937 "Use platform unstable time where supported for timestamps only") \
1938 \
1939 product(bool, DeoptimizeNMethodBarriersALot, false, DIAGNOSTIC, \
1940 "Make nmethod barriers deoptimise a lot.") \
1941 \
1942 develop(bool, VerifyCrossModifyFence, \
1943 false AARCH64_ONLY(DEBUG_ONLY(||true)), \
1944 "Mark all threads after a safepoint, and clear on a modify " \
1945 "fence. Add cleanliness checks.") \
1946 \
1947 product(bool, UseObjectMonitorTable, true, DIAGNOSTIC, \
1948 "Use a table to record inflated monitors rather than the first " \
1949 "word of the object.") \
1950 \
1951 product(int, FastLockingSpins, 8, DIAGNOSTIC, \
1952 "Specifies the number of times fast locking will attempt to " \
1953 "CAS the markWord before inflating. Between each CAS it will " \
1954 "spin for exponentially more time, resulting in a total number " \
1955 "of spins on the order of O(2^value)") \
1956 range(1, 30) \
1957 \
1958 product(uint, TrimNativeHeapInterval, 0, \
1977 product(bool, UseSecondarySupersCache, true, DIAGNOSTIC, \
1978 "Use secondary supers cache during subtype checks.") \
1979 \
1980 product(bool, UseSecondarySupersTable, false, DIAGNOSTIC, \
1981 "Use hash table to lookup secondary supers.") \
1982 \
1983 product(bool, VerifySecondarySupers, false, DIAGNOSTIC, \
1984 "Check that linear and hashed secondary lookups return the same result.") \
1985 \
1986 product(bool, StressSecondarySupers, false, DIAGNOSTIC, \
1987 "Use a terrible hash function in order to generate many collisions.") \
1988 \
1989 product(bool, UseThreadsLockThrottleLock, true, DIAGNOSTIC, \
1990 "Use an extra lock during Thread start and exit to alleviate" \
1991 "contention on Threads_lock.") \
1992 \
1993 develop(uint, BinarySearchThreshold, 16, \
1994 "Minimal number of elements in a sorted collection to prefer" \
1995 "binary search over simple linear search." ) \
1996 \
1997
1998 // end of RUNTIME_FLAGS
1999
2000 DECLARE_FLAGS(LP64_RUNTIME_FLAGS)
2001 DECLARE_ARCH_FLAGS(ARCH_FLAGS)
2002 DECLARE_FLAGS(RUNTIME_FLAGS)
2003 DECLARE_FLAGS(RUNTIME_OS_FLAGS)
2004
2005 #endif // SHARE_RUNTIME_GLOBALS_HPP
|
792 "Verify all arguments to JNI calls") \
793 \
794 product(bool, UseFastJNIAccessors, true, \
795 "Use optimized versions of Get<Primitive>Field") \
796 \
797 product(intx, MaxJNILocalCapacity, 65536, \
798 "Maximum allowable local JNI handle capacity to " \
799 "EnsureLocalCapacity() and PushLocalFrame(), " \
800 "where <= 0 is unlimited, default: 65536") \
801 range(min_intx, max_intx) \
802 \
803 product(bool, EagerXrunInit, false, \
804 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
805 "but not all -Xrun libraries may support the state of the VM " \
806 "at this time") \
807 \
808 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
809 "Number of OutOfMemoryErrors preallocated with backtrace") \
810 range(0, 1024) \
811 \
812 product(bool, PrintFieldLayout, false, DIAGNOSTIC, \
813 "Print field layout for each class") \
814 \
815 product(bool, PrintInlineLayout, false, DIAGNOSTIC, \
816 "Print field layout for each value class or class containing " \
817 "inlined value fields") \
818 \
819 product(bool, PrintFlatArrayLayout, false, DIAGNOSTIC, \
820 "Print array layout for each flattened value array") \
821 \
822 product(bool, UseArrayFlattening, true, DIAGNOSTIC, \
823 "Allow the JVM to flatten arrays of concrete value objects " \
824 "when it determines it is possible and beneficial to do so") \
825 \
826 product(bool, UseFieldFlattening, true, DIAGNOSTIC, \
827 "Allow the JVM to inline the fields of concrete value objects " \
828 "when it determines it is possible and beneficial to do so") \
829 \
830 product(bool, UseNullableAtomicValueFlattening, true, DIAGNOSTIC, \
831 "Allow the JVM to flatten some nullable atomic values") \
832 \
833 product(bool, UseNullFreeNonAtomicValueFlattening, true, EXPERIMENTAL, \
834 "Allow the JVM to flatten some null-free non-atomic values") \
835 \
836 product(bool, UseNullFreeAtomicValueFlattening, true, EXPERIMENTAL, \
837 "Allow the JVM to flatten some null-free atomic values") \
838 \
839 product(bool, UseNullableNonAtomicValueFlattening, true, DIAGNOSTIC, \
840 "Allow the JVM to flatten some strict final non-static fields") \
841 \
842 product(intx, FlatArrayElementMaxOops, 4, DIAGNOSTIC, \
843 "Max number of embedded object references in a value container " \
844 "before no flattening attempts are made, <0 indicates no limit") \
845 \
846 product(uint, FlatteningBudget, 1024, EXPERIMENTAL, \
847 "Maximum size (in bytes) dedicated to flat fields in an instance")\
848 range(0, 1024 * 1024) \
849 develop(ccstrlist, PrintInlineKlassFields, "", \
850 "Print fields collected by InlineKlass::collect_fields") \
851 \
852 /* Need to limit the extent of the padding to reasonable size. */\
853 /* 8K is well beyond the reasonable HW cache line size, even with */\
854 /* aggressive prefetching, while still leaving the room for segregating */\
855 /* among the distinct pages. */\
856 product(int, ContendedPaddingWidth, 128, \
857 "How many bytes to pad the fields/classes marked @Contended with")\
858 range(0, 8192) \
859 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \
860 \
861 product(bool, EnableContended, true, \
862 "Enable @Contended annotation support") \
863 \
864 product(bool, RestrictContended, true, \
865 "Restrict @Contended to trusted classes") \
866 \
867 product(int, DiagnoseSyncOnValueBasedClasses, 0, DIAGNOSTIC, \
868 "Detect and take action upon identifying synchronization on " \
869 "value based classes. Modes: " \
870 "0: off; " \
871 "1: exit with fatal error; " \
1785 "Create JMX Management Server") \
1786 \
1787 product(bool, DisableAttachMechanism, false, \
1788 "Disable mechanism that allows tools to attach to this VM") \
1789 \
1790 product(bool, StartAttachListener, false, \
1791 "Always start Attach Listener at VM startup") \
1792 \
1793 product(bool, EnableDynamicAgentLoading, true, \
1794 "Allow tools to load agents with the attach mechanism") \
1795 \
1796 product(bool, PrintConcurrentLocks, false, MANAGEABLE, \
1797 "Print java.util.concurrent locks in thread dump") \
1798 \
1799 product(bool, PrintMethodHandleStubs, false, DIAGNOSTIC, \
1800 "Print generated stub code for method handles") \
1801 \
1802 product(bool, VerifyMethodHandles, trueInDebug, DIAGNOSTIC, \
1803 "perform extra checks when constructing method handles") \
1804 \
1805 product(bool, IgnoreAssertUnsetFields, false, DIAGNOSTIC, \
1806 "Ignore assert_unset_fields") \
1807 \
1808 product(bool, ShowHiddenFrames, false, DIAGNOSTIC, \
1809 "show method handle implementation frames (usually hidden)") \
1810 \
1811 product(bool, ShowCarrierFrames, false, DIAGNOSTIC, \
1812 "show virtual threads' carrier frames in exceptions") \
1813 \
1814 product(bool, TrustFinalNonStaticFields, false, EXPERIMENTAL, \
1815 "trust final non-static declarations for constant folding") \
1816 \
1817 product(bool, FoldStableValues, true, DIAGNOSTIC, \
1818 "Optimize loads from stable fields (marked w/ @Stable)") \
1819 \
1820 product(int, UseBootstrapCallInfo, 1, DIAGNOSTIC, \
1821 "0: when resolving InDy or ConDy, force all BSM arguments to be " \
1822 "resolved before the bootstrap method is called; 1: when a BSM " \
1823 "that may accept a BootstrapCallInfo is detected, use that API " \
1824 "to pass BSM arguments, which allows the BSM to delay their " \
1825 "resolution; 2+: stress test the BCI API by calling more BSMs " \
1826 "via that API, instead of with the eagerly-resolved array.") \
1827 \
1959 "On internal errors, include registers in error report.") \
1960 \
1961 product(bool, UseSwitchProfiling, true, DIAGNOSTIC, \
1962 "leverage profiling for table/lookup switch") \
1963 \
1964 develop(bool, TraceMemoryWriteback, false, \
1965 "Trace memory writeback operations") \
1966 \
1967 JFR_ONLY(product(bool, FlightRecorder, false, \
1968 "(Deprecated) Enable Flight Recorder")) \
1969 \
1970 JFR_ONLY(product(ccstr, FlightRecorderOptions, nullptr, \
1971 "Flight Recorder options")) \
1972 \
1973 JFR_ONLY(product(ccstr, StartFlightRecording, nullptr, \
1974 "Start flight recording with options")) \
1975 \
1976 product(bool, UseFastUnorderedTimeStamps, false, EXPERIMENTAL, \
1977 "Use platform unstable time where supported for timestamps only") \
1978 \
1979 product_pd(bool, InlineTypePassFieldsAsArgs, DIAGNOSTIC, \
1980 "Pass each inline type field as an argument at calls") \
1981 \
1982 product_pd(bool, InlineTypeReturnedAsFields, DIAGNOSTIC, \
1983 "Return fields instead of an inline type reference") \
1984 \
1985 develop(bool, StressCallingConvention, false, \
1986 "Stress the scalarized calling convention.") \
1987 \
1988 develop(bool, PreloadClasses, true, \
1989 "Preloading all classes from the LoadableDescriptors attribute") \
1990 \
1991 product(ccstrlist, ForceNonTearable, "", DIAGNOSTIC, \
1992 "List of inline classes which are forced to be atomic " \
1993 "(whitespace and commas separate names, " \
1994 "and leading and trailing stars '*' are wildcards)") \
1995 \
1996 product(bool, DeoptimizeNMethodBarriersALot, false, DIAGNOSTIC, \
1997 "Make nmethod barriers deoptimise a lot.") \
1998 \
1999 develop(bool, VerifyCrossModifyFence, \
2000 false AARCH64_ONLY(DEBUG_ONLY(||true)), \
2001 "Mark all threads after a safepoint, and clear on a modify " \
2002 "fence. Add cleanliness checks.") \
2003 \
2004 product(bool, UseObjectMonitorTable, true, DIAGNOSTIC, \
2005 "Use a table to record inflated monitors rather than the first " \
2006 "word of the object.") \
2007 \
2008 product(int, FastLockingSpins, 8, DIAGNOSTIC, \
2009 "Specifies the number of times fast locking will attempt to " \
2010 "CAS the markWord before inflating. Between each CAS it will " \
2011 "spin for exponentially more time, resulting in a total number " \
2012 "of spins on the order of O(2^value)") \
2013 range(1, 30) \
2014 \
2015 product(uint, TrimNativeHeapInterval, 0, \
2034 product(bool, UseSecondarySupersCache, true, DIAGNOSTIC, \
2035 "Use secondary supers cache during subtype checks.") \
2036 \
2037 product(bool, UseSecondarySupersTable, false, DIAGNOSTIC, \
2038 "Use hash table to lookup secondary supers.") \
2039 \
2040 product(bool, VerifySecondarySupers, false, DIAGNOSTIC, \
2041 "Check that linear and hashed secondary lookups return the same result.") \
2042 \
2043 product(bool, StressSecondarySupers, false, DIAGNOSTIC, \
2044 "Use a terrible hash function in order to generate many collisions.") \
2045 \
2046 product(bool, UseThreadsLockThrottleLock, true, DIAGNOSTIC, \
2047 "Use an extra lock during Thread start and exit to alleviate" \
2048 "contention on Threads_lock.") \
2049 \
2050 develop(uint, BinarySearchThreshold, 16, \
2051 "Minimal number of elements in a sorted collection to prefer" \
2052 "binary search over simple linear search." ) \
2053 \
2054 product(bool, UseAcmpFastPath, true, DIAGNOSTIC, \
2055 "Use fast path for acmp.") \
2056
2057 // end of RUNTIME_FLAGS
2058
2059 DECLARE_FLAGS(LP64_RUNTIME_FLAGS)
2060 DECLARE_ARCH_FLAGS(ARCH_FLAGS)
2061 DECLARE_FLAGS(RUNTIME_FLAGS)
2062 DECLARE_FLAGS(RUNTIME_OS_FLAGS)
2063
2064 #endif // SHARE_RUNTIME_GLOBALS_HPP
|