799 product(bool, UseFastJNIAccessors, true, \
800 "Use optimized versions of Get<Primitive>Field") \
801 \
802 product(intx, MaxJNILocalCapacity, 65536, \
803 "Maximum allowable local JNI handle capacity to " \
804 "EnsureLocalCapacity() and PushLocalFrame(), " \
805 "where <= 0 is unlimited, default: 65536") \
806 range(min_intx, max_intx) \
807 \
808 product(bool, EagerXrunInit, false, \
809 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
810 "but not all -Xrun libraries may support the state of the VM " \
811 "at this time") \
812 \
813 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
814 "Number of OutOfMemoryErrors preallocated with backtrace") \
815 \
816 product(bool, UseXMMForArrayCopy, false, \
817 "Use SSE2 MOVQ instruction for Arraycopy") \
818 \
819 develop(bool, PrintFieldLayout, false, \
820 "Print field layout for each class") \
821 \
822 /* Need to limit the extent of the padding to reasonable size. */\
823 /* 8K is well beyond the reasonable HW cache line size, even with */\
824 /* aggressive prefetching, while still leaving the room for segregating */\
825 /* among the distinct pages. */\
826 product(int, ContendedPaddingWidth, 128, \
827 "How many bytes to pad the fields/classes marked @Contended with")\
828 range(0, 8192) \
829 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \
830 \
831 product(bool, EnableContended, true, \
832 "Enable @Contended annotation support") \
833 \
834 product(bool, RestrictContended, true, \
835 "Restrict @Contended to trusted classes") \
836 \
837 product(int, DiagnoseSyncOnValueBasedClasses, 0, DIAGNOSTIC, \
838 "Detect and take action upon identifying synchronization on " \
839 "value based classes. Modes: " \
840 "0: off; " \
841 "1: exit with fatal error; " \
1764 "Create JMX Management Server") \
1765 \
1766 product(bool, DisableAttachMechanism, false, \
1767 "Disable mechanism that allows tools to attach to this VM") \
1768 \
1769 product(bool, StartAttachListener, false, \
1770 "Always start Attach Listener at VM startup") \
1771 \
1772 product(bool, EnableDynamicAgentLoading, true, \
1773 "Allow tools to load agents with the attach mechanism") \
1774 \
1775 product(bool, PrintConcurrentLocks, false, MANAGEABLE, \
1776 "Print java.util.concurrent locks in thread dump") \
1777 \
1778 product(bool, PrintMethodHandleStubs, false, DIAGNOSTIC, \
1779 "Print generated stub code for method handles") \
1780 \
1781 product(bool, VerifyMethodHandles, trueInDebug, DIAGNOSTIC, \
1782 "perform extra checks when constructing method handles") \
1783 \
1784 product(bool, ShowHiddenFrames, false, DIAGNOSTIC, \
1785 "show method handle implementation frames (usually hidden)") \
1786 \
1787 product(bool, ShowCarrierFrames, false, DIAGNOSTIC, \
1788 "show virtual threads' carrier frames in exceptions") \
1789 \
1790 product(bool, TrustFinalNonStaticFields, false, EXPERIMENTAL, \
1791 "trust final non-static declarations for constant folding") \
1792 \
1793 product(bool, FoldStableValues, true, DIAGNOSTIC, \
1794 "Optimize loads from stable fields (marked w/ @Stable)") \
1795 \
1796 product(int, UseBootstrapCallInfo, 1, DIAGNOSTIC, \
1797 "0: when resolving InDy or ConDy, force all BSM arguments to be " \
1798 "resolved before the bootstrap method is called; 1: when a BSM " \
1799 "that may accept a BootstrapCallInfo is detected, use that API " \
1800 "to pass BSM arguments, which allows the BSM to delay their " \
1801 "resolution; 2+: stress test the BCI API by calling more BSMs " \
1802 "via that API, instead of with the eagerly-resolved array.") \
1803 \
1935 "On internal errors, include registers in error report.") \
1936 \
1937 product(bool, UseSwitchProfiling, true, DIAGNOSTIC, \
1938 "leverage profiling for table/lookup switch") \
1939 \
1940 develop(bool, TraceMemoryWriteback, false, \
1941 "Trace memory writeback operations") \
1942 \
1943 JFR_ONLY(product(bool, FlightRecorder, false, \
1944 "(Deprecated) Enable Flight Recorder")) \
1945 \
1946 JFR_ONLY(product(ccstr, FlightRecorderOptions, nullptr, \
1947 "Flight Recorder options")) \
1948 \
1949 JFR_ONLY(product(ccstr, StartFlightRecording, nullptr, \
1950 "Start flight recording with options")) \
1951 \
1952 product(bool, UseFastUnorderedTimeStamps, false, EXPERIMENTAL, \
1953 "Use platform unstable time where supported for timestamps only") \
1954 \
1955 product(bool, DeoptimizeNMethodBarriersALot, false, DIAGNOSTIC, \
1956 "Make nmethod barriers deoptimise a lot.") \
1957 \
1958 develop(bool, VerifyCrossModifyFence, \
1959 false AARCH64_ONLY(DEBUG_ONLY(||true)), \
1960 "Mark all threads after a safepoint, and clear on a modify " \
1961 "fence. Add cleanliness checks.") \
1962 \
1963 product(bool, UseObjectMonitorTable, false, DIAGNOSTIC, \
1964 "With Lightweight Locking mode, use a table to record inflated " \
1965 "monitors rather than the first word of the object.") \
1966 \
1967 product(int, LightweightFastLockingSpins, 13, DIAGNOSTIC, \
1968 "Specifies the number of times lightweight fast locking will " \
1969 "attempt to CAS the markWord before inflating. Between each " \
1970 "CAS it will spin for exponentially more time, resulting in " \
1971 "a total number of spins on the order of O(2^value)") \
1972 range(1, 30) \
1973 \
1974 product(uint, TrimNativeHeapInterval, 0, \
|
799 product(bool, UseFastJNIAccessors, true, \
800 "Use optimized versions of Get<Primitive>Field") \
801 \
802 product(intx, MaxJNILocalCapacity, 65536, \
803 "Maximum allowable local JNI handle capacity to " \
804 "EnsureLocalCapacity() and PushLocalFrame(), " \
805 "where <= 0 is unlimited, default: 65536") \
806 range(min_intx, max_intx) \
807 \
808 product(bool, EagerXrunInit, false, \
809 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
810 "but not all -Xrun libraries may support the state of the VM " \
811 "at this time") \
812 \
813 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
814 "Number of OutOfMemoryErrors preallocated with backtrace") \
815 \
816 product(bool, UseXMMForArrayCopy, false, \
817 "Use SSE2 MOVQ instruction for Arraycopy") \
818 \
819 product(bool, PrintFieldLayout, false, DIAGNOSTIC, \
820 "Print field layout for each class") \
821 \
822 product(bool, PrintInlineLayout, false, DIAGNOSTIC, \
823 "Print field layout for each inline type or class with inline fields") \
824 \
825 product(bool, PrintFlatArrayLayout, false, DIAGNOSTIC, \
826 "Print array layout for each inline type array") \
827 \
828 product(bool, UseArrayFlattening, true, \
829 "Allow the VM to flatten arrays") \
830 \
831 product(bool, UseFieldFlattening, true, \
832 "Allow the VM to flatten value fields") \
833 \
834 product(bool, UseNonAtomicValueFlattening, true, \
835 "Allow the JVM to flatten some non-atomic null-free values") \
836 \
837 product(bool, UseNullableValueFlattening, true, \
838 "Allow the JVM to flatten some nullable values") \
839 \
840 product(bool, UseAtomicValueFlattening, true, \
841 "Allow the JVM to flatten some atomic values") \
842 \
843 product(intx, FlatArrayElementMaxOops, 4, \
844 "Max nof embedded object references in an inline type to flatten, <0 no limit") \
845 \
846 develop(ccstrlist, PrintInlineKlassFields, "", \
847 "Print fields collected by InlineKlass::collect_fields") \
848 \
849 /* Need to limit the extent of the padding to reasonable size. */\
850 /* 8K is well beyond the reasonable HW cache line size, even with */\
851 /* aggressive prefetching, while still leaving the room for segregating */\
852 /* among the distinct pages. */\
853 product(int, ContendedPaddingWidth, 128, \
854 "How many bytes to pad the fields/classes marked @Contended with")\
855 range(0, 8192) \
856 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \
857 \
858 product(bool, EnableContended, true, \
859 "Enable @Contended annotation support") \
860 \
861 product(bool, RestrictContended, true, \
862 "Restrict @Contended to trusted classes") \
863 \
864 product(int, DiagnoseSyncOnValueBasedClasses, 0, DIAGNOSTIC, \
865 "Detect and take action upon identifying synchronization on " \
866 "value based classes. Modes: " \
867 "0: off; " \
868 "1: exit with fatal error; " \
1791 "Create JMX Management Server") \
1792 \
1793 product(bool, DisableAttachMechanism, false, \
1794 "Disable mechanism that allows tools to attach to this VM") \
1795 \
1796 product(bool, StartAttachListener, false, \
1797 "Always start Attach Listener at VM startup") \
1798 \
1799 product(bool, EnableDynamicAgentLoading, true, \
1800 "Allow tools to load agents with the attach mechanism") \
1801 \
1802 product(bool, PrintConcurrentLocks, false, MANAGEABLE, \
1803 "Print java.util.concurrent locks in thread dump") \
1804 \
1805 product(bool, PrintMethodHandleStubs, false, DIAGNOSTIC, \
1806 "Print generated stub code for method handles") \
1807 \
1808 product(bool, VerifyMethodHandles, trueInDebug, DIAGNOSTIC, \
1809 "perform extra checks when constructing method handles") \
1810 \
1811 product(bool, IgnoreAssertUnsetFields, false, DIAGNOSTIC, \
1812 "Ignore assert_unset_fields") \
1813 \
1814 product(bool, ShowHiddenFrames, false, DIAGNOSTIC, \
1815 "show method handle implementation frames (usually hidden)") \
1816 \
1817 product(bool, ShowCarrierFrames, false, DIAGNOSTIC, \
1818 "show virtual threads' carrier frames in exceptions") \
1819 \
1820 product(bool, TrustFinalNonStaticFields, false, EXPERIMENTAL, \
1821 "trust final non-static declarations for constant folding") \
1822 \
1823 product(bool, FoldStableValues, true, DIAGNOSTIC, \
1824 "Optimize loads from stable fields (marked w/ @Stable)") \
1825 \
1826 product(int, UseBootstrapCallInfo, 1, DIAGNOSTIC, \
1827 "0: when resolving InDy or ConDy, force all BSM arguments to be " \
1828 "resolved before the bootstrap method is called; 1: when a BSM " \
1829 "that may accept a BootstrapCallInfo is detected, use that API " \
1830 "to pass BSM arguments, which allows the BSM to delay their " \
1831 "resolution; 2+: stress test the BCI API by calling more BSMs " \
1832 "via that API, instead of with the eagerly-resolved array.") \
1833 \
1965 "On internal errors, include registers in error report.") \
1966 \
1967 product(bool, UseSwitchProfiling, true, DIAGNOSTIC, \
1968 "leverage profiling for table/lookup switch") \
1969 \
1970 develop(bool, TraceMemoryWriteback, false, \
1971 "Trace memory writeback operations") \
1972 \
1973 JFR_ONLY(product(bool, FlightRecorder, false, \
1974 "(Deprecated) Enable Flight Recorder")) \
1975 \
1976 JFR_ONLY(product(ccstr, FlightRecorderOptions, nullptr, \
1977 "Flight Recorder options")) \
1978 \
1979 JFR_ONLY(product(ccstr, StartFlightRecording, nullptr, \
1980 "Start flight recording with options")) \
1981 \
1982 product(bool, UseFastUnorderedTimeStamps, false, EXPERIMENTAL, \
1983 "Use platform unstable time where supported for timestamps only") \
1984 \
1985 product(bool, EnableValhalla, true, \
1986 "Enable experimental Valhalla features") \
1987 \
1988 product_pd(bool, InlineTypePassFieldsAsArgs, \
1989 "Pass each inline type field as an argument at calls") \
1990 \
1991 product_pd(bool, InlineTypeReturnedAsFields, \
1992 "Return fields instead of an inline type reference") \
1993 \
1994 develop(bool, StressCallingConvention, false, \
1995 "Stress the scalarized calling convention.") \
1996 \
1997 develop(bool, PreloadClasses, true, \
1998 "Preloading all classes from the LoadableDescriptors attribute") \
1999 \
2000 product(ccstrlist, ForceNonTearable, "", DIAGNOSTIC, \
2001 "List of inline classes which are forced to be atomic " \
2002 "(whitespace and commas separate names, " \
2003 "and leading and trailing stars '*' are wildcards)") \
2004 \
2005 product(bool, DeoptimizeNMethodBarriersALot, false, DIAGNOSTIC, \
2006 "Make nmethod barriers deoptimise a lot.") \
2007 \
2008 develop(bool, VerifyCrossModifyFence, \
2009 false AARCH64_ONLY(DEBUG_ONLY(||true)), \
2010 "Mark all threads after a safepoint, and clear on a modify " \
2011 "fence. Add cleanliness checks.") \
2012 \
2013 product(bool, UseObjectMonitorTable, false, DIAGNOSTIC, \
2014 "With Lightweight Locking mode, use a table to record inflated " \
2015 "monitors rather than the first word of the object.") \
2016 \
2017 product(int, LightweightFastLockingSpins, 13, DIAGNOSTIC, \
2018 "Specifies the number of times lightweight fast locking will " \
2019 "attempt to CAS the markWord before inflating. Between each " \
2020 "CAS it will spin for exponentially more time, resulting in " \
2021 "a total number of spins on the order of O(2^value)") \
2022 range(1, 30) \
2023 \
2024 product(uint, TrimNativeHeapInterval, 0, \
|