796 product(bool, UseFastJNIAccessors, true, \
797 "Use optimized versions of Get<Primitive>Field") \
798 \
799 product(intx, MaxJNILocalCapacity, 65536, \
800 "Maximum allowable local JNI handle capacity to " \
801 "EnsureLocalCapacity() and PushLocalFrame(), " \
802 "where <= 0 is unlimited, default: 65536") \
803 range(min_intx, max_intx) \
804 \
805 product(bool, EagerXrunInit, false, \
806 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
807 "but not all -Xrun libraries may support the state of the VM " \
808 "at this time") \
809 \
810 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
811 "Number of OutOfMemoryErrors preallocated with backtrace") \
812 \
813 product(bool, UseXMMForArrayCopy, false, \
814 "Use SSE2 MOVQ instruction for Arraycopy") \
815 \
816 develop(bool, PrintFieldLayout, false, \
817 "Print field layout for each class") \
818 \
819 /* Need to limit the extent of the padding to reasonable size. */\
820 /* 8K is well beyond the reasonable HW cache line size, even with */\
821 /* aggressive prefetching, while still leaving the room for segregating */\
822 /* among the distinct pages. */\
823 product(int, ContendedPaddingWidth, 128, \
824 "How many bytes to pad the fields/classes marked @Contended with")\
825 range(0, 8192) \
826 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \
827 \
828 product(bool, EnableContended, true, \
829 "Enable @Contended annotation support") \
830 \
831 product(bool, RestrictContended, true, \
832 "Restrict @Contended to trusted classes") \
833 \
834 product(int, DiagnoseSyncOnValueBasedClasses, 0, DIAGNOSTIC, \
835 "Detect and take action upon identifying synchronization on " \
836 "value based classes. Modes: " \
837 "0: off; " \
838 "1: exit with fatal error; " \
1757 "Create JMX Management Server") \
1758 \
1759 product(bool, DisableAttachMechanism, false, \
1760 "Disable mechanism that allows tools to attach to this VM") \
1761 \
1762 product(bool, StartAttachListener, false, \
1763 "Always start Attach Listener at VM startup") \
1764 \
1765 product(bool, EnableDynamicAgentLoading, true, \
1766 "Allow tools to load agents with the attach mechanism") \
1767 \
1768 product(bool, PrintConcurrentLocks, false, MANAGEABLE, \
1769 "Print java.util.concurrent locks in thread dump") \
1770 \
1771 product(bool, PrintMethodHandleStubs, false, DIAGNOSTIC, \
1772 "Print generated stub code for method handles") \
1773 \
1774 product(bool, VerifyMethodHandles, trueInDebug, DIAGNOSTIC, \
1775 "perform extra checks when constructing method handles") \
1776 \
1777 product(bool, ShowHiddenFrames, false, DIAGNOSTIC, \
1778 "show method handle implementation frames (usually hidden)") \
1779 \
1780 product(bool, ShowCarrierFrames, false, DIAGNOSTIC, \
1781 "show virtual threads' carrier frames in exceptions") \
1782 \
1783 product(bool, TrustFinalNonStaticFields, false, EXPERIMENTAL, \
1784 "trust final non-static declarations for constant folding") \
1785 \
1786 product(bool, FoldStableValues, true, DIAGNOSTIC, \
1787 "Optimize loads from stable fields (marked w/ @Stable)") \
1788 \
1789 product(int, UseBootstrapCallInfo, 1, DIAGNOSTIC, \
1790 "0: when resolving InDy or ConDy, force all BSM arguments to be " \
1791 "resolved before the bootstrap method is called; 1: when a BSM " \
1792 "that may accept a BootstrapCallInfo is detected, use that API " \
1793 "to pass BSM arguments, which allows the BSM to delay their " \
1794 "resolution; 2+: stress test the BCI API by calling more BSMs " \
1795 "via that API, instead of with the eagerly-resolved array.") \
1796 \
1928 "On internal errors, include registers in error report.") \
1929 \
1930 product(bool, UseSwitchProfiling, true, DIAGNOSTIC, \
1931 "leverage profiling for table/lookup switch") \
1932 \
1933 develop(bool, TraceMemoryWriteback, false, \
1934 "Trace memory writeback operations") \
1935 \
1936 JFR_ONLY(product(bool, FlightRecorder, false, \
1937 "(Deprecated) Enable Flight Recorder")) \
1938 \
1939 JFR_ONLY(product(ccstr, FlightRecorderOptions, nullptr, \
1940 "Flight Recorder options")) \
1941 \
1942 JFR_ONLY(product(ccstr, StartFlightRecording, nullptr, \
1943 "Start flight recording with options")) \
1944 \
1945 product(bool, UseFastUnorderedTimeStamps, false, EXPERIMENTAL, \
1946 "Use platform unstable time where supported for timestamps only") \
1947 \
1948 product(bool, DeoptimizeNMethodBarriersALot, false, DIAGNOSTIC, \
1949 "Make nmethod barriers deoptimise a lot.") \
1950 \
1951 develop(bool, VerifyCrossModifyFence, \
1952 false AARCH64_ONLY(DEBUG_ONLY(||true)), \
1953 "Mark all threads after a safepoint, and clear on a modify " \
1954 "fence. Add cleanliness checks.") \
1955 \
1956 product(bool, UseObjectMonitorTable, false, DIAGNOSTIC, \
1957 "With Lightweight Locking mode, use a table to record inflated " \
1958 "monitors rather than the first word of the object.") \
1959 \
1960 product(int, LightweightFastLockingSpins, 13, DIAGNOSTIC, \
1961 "Specifies the number of times lightweight fast locking will " \
1962 "attempt to CAS the markWord before inflating. Between each " \
1963 "CAS it will spin for exponentially more time, resulting in " \
1964 "a total number of spins on the order of O(2^value)") \
1965 range(1, 30) \
1966 \
1967 product(uint, TrimNativeHeapInterval, 0, \
|
796 product(bool, UseFastJNIAccessors, true, \
797 "Use optimized versions of Get<Primitive>Field") \
798 \
799 product(intx, MaxJNILocalCapacity, 65536, \
800 "Maximum allowable local JNI handle capacity to " \
801 "EnsureLocalCapacity() and PushLocalFrame(), " \
802 "where <= 0 is unlimited, default: 65536") \
803 range(min_intx, max_intx) \
804 \
805 product(bool, EagerXrunInit, false, \
806 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
807 "but not all -Xrun libraries may support the state of the VM " \
808 "at this time") \
809 \
810 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
811 "Number of OutOfMemoryErrors preallocated with backtrace") \
812 \
813 product(bool, UseXMMForArrayCopy, false, \
814 "Use SSE2 MOVQ instruction for Arraycopy") \
815 \
816 product(bool, PrintFieldLayout, false, DIAGNOSTIC, \
817 "Print field layout for each class") \
818 \
819 product(bool, PrintInlineLayout, false, DIAGNOSTIC, \
820 "Print field layout for each inline type or class with inline fields") \
821 \
822 product(bool, PrintFlatArrayLayout, false, DIAGNOSTIC, \
823 "Print array layout for each inline type array") \
824 \
825 product(bool, UseArrayFlattening, true, \
826 "Allow the VM to flatten arrays") \
827 \
828 product(bool, UseFieldFlattening, true, \
829 "Allow the VM to flatten value fields") \
830 \
831 product(bool, UseNonAtomicValueFlattening, true, \
832 "Allow the JVM to flatten some non-atomic null-free values") \
833 \
834 product(bool, UseNullableValueFlattening, true, \
835 "Allow the JVM to flatten some nullable values") \
836 \
837 product(bool, UseAtomicValueFlattening, true, \
838 "Allow the JVM to flatten some atomic values") \
839 \
840 product(intx, FlatArrayElementMaxOops, 4, \
841 "Max nof embedded object references in an inline type to flatten, <0 no limit") \
842 \
843 develop(ccstrlist, PrintInlineKlassFields, "", \
844 "Print fields collected by InlineKlass::collect_fields") \
845 \
846 /* Need to limit the extent of the padding to reasonable size. */\
847 /* 8K is well beyond the reasonable HW cache line size, even with */\
848 /* aggressive prefetching, while still leaving the room for segregating */\
849 /* among the distinct pages. */\
850 product(int, ContendedPaddingWidth, 128, \
851 "How many bytes to pad the fields/classes marked @Contended with")\
852 range(0, 8192) \
853 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \
854 \
855 product(bool, EnableContended, true, \
856 "Enable @Contended annotation support") \
857 \
858 product(bool, RestrictContended, true, \
859 "Restrict @Contended to trusted classes") \
860 \
861 product(int, DiagnoseSyncOnValueBasedClasses, 0, DIAGNOSTIC, \
862 "Detect and take action upon identifying synchronization on " \
863 "value based classes. Modes: " \
864 "0: off; " \
865 "1: exit with fatal error; " \
1784 "Create JMX Management Server") \
1785 \
1786 product(bool, DisableAttachMechanism, false, \
1787 "Disable mechanism that allows tools to attach to this VM") \
1788 \
1789 product(bool, StartAttachListener, false, \
1790 "Always start Attach Listener at VM startup") \
1791 \
1792 product(bool, EnableDynamicAgentLoading, true, \
1793 "Allow tools to load agents with the attach mechanism") \
1794 \
1795 product(bool, PrintConcurrentLocks, false, MANAGEABLE, \
1796 "Print java.util.concurrent locks in thread dump") \
1797 \
1798 product(bool, PrintMethodHandleStubs, false, DIAGNOSTIC, \
1799 "Print generated stub code for method handles") \
1800 \
1801 product(bool, VerifyMethodHandles, trueInDebug, DIAGNOSTIC, \
1802 "perform extra checks when constructing method handles") \
1803 \
1804 product(bool, IgnoreAssertUnsetFields, false, DIAGNOSTIC, \
1805 "Ignore assert_unset_fields") \
1806 \
1807 product(bool, ShowHiddenFrames, false, DIAGNOSTIC, \
1808 "show method handle implementation frames (usually hidden)") \
1809 \
1810 product(bool, ShowCarrierFrames, false, DIAGNOSTIC, \
1811 "show virtual threads' carrier frames in exceptions") \
1812 \
1813 product(bool, TrustFinalNonStaticFields, false, EXPERIMENTAL, \
1814 "trust final non-static declarations for constant folding") \
1815 \
1816 product(bool, FoldStableValues, true, DIAGNOSTIC, \
1817 "Optimize loads from stable fields (marked w/ @Stable)") \
1818 \
1819 product(int, UseBootstrapCallInfo, 1, DIAGNOSTIC, \
1820 "0: when resolving InDy or ConDy, force all BSM arguments to be " \
1821 "resolved before the bootstrap method is called; 1: when a BSM " \
1822 "that may accept a BootstrapCallInfo is detected, use that API " \
1823 "to pass BSM arguments, which allows the BSM to delay their " \
1824 "resolution; 2+: stress test the BCI API by calling more BSMs " \
1825 "via that API, instead of with the eagerly-resolved array.") \
1826 \
1958 "On internal errors, include registers in error report.") \
1959 \
1960 product(bool, UseSwitchProfiling, true, DIAGNOSTIC, \
1961 "leverage profiling for table/lookup switch") \
1962 \
1963 develop(bool, TraceMemoryWriteback, false, \
1964 "Trace memory writeback operations") \
1965 \
1966 JFR_ONLY(product(bool, FlightRecorder, false, \
1967 "(Deprecated) Enable Flight Recorder")) \
1968 \
1969 JFR_ONLY(product(ccstr, FlightRecorderOptions, nullptr, \
1970 "Flight Recorder options")) \
1971 \
1972 JFR_ONLY(product(ccstr, StartFlightRecording, nullptr, \
1973 "Start flight recording with options")) \
1974 \
1975 product(bool, UseFastUnorderedTimeStamps, false, EXPERIMENTAL, \
1976 "Use platform unstable time where supported for timestamps only") \
1977 \
1978 product(bool, EnableValhalla, true, \
1979 "Enable experimental Valhalla features") \
1980 \
1981 product_pd(bool, InlineTypePassFieldsAsArgs, \
1982 "Pass each inline type field as an argument at calls") \
1983 \
1984 product_pd(bool, InlineTypeReturnedAsFields, \
1985 "Return fields instead of an inline type reference") \
1986 \
1987 develop(bool, StressCallingConvention, false, \
1988 "Stress the scalarized calling convention.") \
1989 \
1990 develop(bool, PreloadClasses, true, \
1991 "Preloading all classes from the LoadableDescriptors attribute") \
1992 \
1993 product(ccstrlist, ForceNonTearable, "", DIAGNOSTIC, \
1994 "List of inline classes which are forced to be atomic " \
1995 "(whitespace and commas separate names, " \
1996 "and leading and trailing stars '*' are wildcards)") \
1997 \
1998 product(bool, DeoptimizeNMethodBarriersALot, false, DIAGNOSTIC, \
1999 "Make nmethod barriers deoptimise a lot.") \
2000 \
2001 develop(bool, VerifyCrossModifyFence, \
2002 false AARCH64_ONLY(DEBUG_ONLY(||true)), \
2003 "Mark all threads after a safepoint, and clear on a modify " \
2004 "fence. Add cleanliness checks.") \
2005 \
2006 product(bool, UseObjectMonitorTable, false, DIAGNOSTIC, \
2007 "With Lightweight Locking mode, use a table to record inflated " \
2008 "monitors rather than the first word of the object.") \
2009 \
2010 product(int, LightweightFastLockingSpins, 13, DIAGNOSTIC, \
2011 "Specifies the number of times lightweight fast locking will " \
2012 "attempt to CAS the markWord before inflating. Between each " \
2013 "CAS it will spin for exponentially more time, resulting in " \
2014 "a total number of spins on the order of O(2^value)") \
2015 range(1, 30) \
2016 \
2017 product(uint, TrimNativeHeapInterval, 0, \
|