781 "Verify all arguments to JNI calls") \
782 \
783 product(bool, UseFastJNIAccessors, true, \
784 "Use optimized versions of Get<Primitive>Field") \
785 \
786 product(intx, MaxJNILocalCapacity, 65536, \
787 "Maximum allowable local JNI handle capacity to " \
788 "EnsureLocalCapacity() and PushLocalFrame(), " \
789 "where <= 0 is unlimited, default: 65536") \
790 range(min_intx, max_intx) \
791 \
792 product(bool, EagerXrunInit, false, \
793 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
794 "but not all -Xrun libraries may support the state of the VM " \
795 "at this time") \
796 \
797 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
798 "Number of OutOfMemoryErrors preallocated with backtrace") \
799 range(0, 1024) \
800 \
801 develop(bool, PrintFieldLayout, false, \
802 "Print field layout for each class") \
803 \
804 /* Need to limit the extent of the padding to reasonable size. */\
805 /* 8K is well beyond the reasonable HW cache line size, even with */\
806 /* aggressive prefetching, while still leaving the room for segregating */\
807 /* among the distinct pages. */\
808 product(int, ContendedPaddingWidth, 128, \
809 "How many bytes to pad the fields/classes marked @Contended with")\
810 range(0, 8192) \
811 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \
812 \
813 product(bool, EnableContended, true, \
814 "Enable @Contended annotation support") \
815 \
816 product(bool, RestrictContended, true, \
817 "Restrict @Contended to trusted classes") \
818 \
819 product(int, DiagnoseSyncOnValueBasedClasses, 0, DIAGNOSTIC, \
820 "Detect and take action upon identifying synchronization on " \
821 "value based classes. Modes: " \
822 "0: off; " \
823 "1: exit with fatal error; " \
1737 "Create JMX Management Server") \
1738 \
1739 product(bool, DisableAttachMechanism, false, \
1740 "Disable mechanism that allows tools to attach to this VM") \
1741 \
1742 product(bool, StartAttachListener, false, \
1743 "Always start Attach Listener at VM startup") \
1744 \
1745 product(bool, EnableDynamicAgentLoading, true, \
1746 "Allow tools to load agents with the attach mechanism") \
1747 \
1748 product(bool, PrintConcurrentLocks, false, MANAGEABLE, \
1749 "Print java.util.concurrent locks in thread dump") \
1750 \
1751 product(bool, PrintMethodHandleStubs, false, DIAGNOSTIC, \
1752 "Print generated stub code for method handles") \
1753 \
1754 product(bool, VerifyMethodHandles, trueInDebug, DIAGNOSTIC, \
1755 "perform extra checks when constructing method handles") \
1756 \
1757 product(bool, ShowHiddenFrames, false, DIAGNOSTIC, \
1758 "show method handle implementation frames (usually hidden)") \
1759 \
1760 product(bool, ShowCarrierFrames, false, DIAGNOSTIC, \
1761 "show virtual threads' carrier frames in exceptions") \
1762 \
1763 product(bool, TrustFinalNonStaticFields, false, EXPERIMENTAL, \
1764 "trust final non-static declarations for constant folding") \
1765 \
1766 product(bool, FoldStableValues, true, DIAGNOSTIC, \
1767 "Optimize loads from stable fields (marked w/ @Stable)") \
1768 \
1769 product(int, UseBootstrapCallInfo, 1, DIAGNOSTIC, \
1770 "0: when resolving InDy or ConDy, force all BSM arguments to be " \
1771 "resolved before the bootstrap method is called; 1: when a BSM " \
1772 "that may accept a BootstrapCallInfo is detected, use that API " \
1773 "to pass BSM arguments, which allows the BSM to delay their " \
1774 "resolution; 2+: stress test the BCI API by calling more BSMs " \
1775 "via that API, instead of with the eagerly-resolved array.") \
1776 \
1908 "On internal errors, include registers in error report.") \
1909 \
1910 product(bool, UseSwitchProfiling, true, DIAGNOSTIC, \
1911 "leverage profiling for table/lookup switch") \
1912 \
1913 develop(bool, TraceMemoryWriteback, false, \
1914 "Trace memory writeback operations") \
1915 \
1916 JFR_ONLY(product(bool, FlightRecorder, false, \
1917 "(Deprecated) Enable Flight Recorder")) \
1918 \
1919 JFR_ONLY(product(ccstr, FlightRecorderOptions, nullptr, \
1920 "Flight Recorder options")) \
1921 \
1922 JFR_ONLY(product(ccstr, StartFlightRecording, nullptr, \
1923 "Start flight recording with options")) \
1924 \
1925 product(bool, UseFastUnorderedTimeStamps, false, EXPERIMENTAL, \
1926 "Use platform unstable time where supported for timestamps only") \
1927 \
1928 product(bool, DeoptimizeNMethodBarriersALot, false, DIAGNOSTIC, \
1929 "Make nmethod barriers deoptimise a lot.") \
1930 \
1931 develop(bool, VerifyCrossModifyFence, \
1932 false AARCH64_ONLY(DEBUG_ONLY(||true)), \
1933 "Mark all threads after a safepoint, and clear on a modify " \
1934 "fence. Add cleanliness checks.") \
1935 \
1936 product(bool, UseObjectMonitorTable, true, DIAGNOSTIC, \
1937 "Use a table to record inflated monitors rather than the first " \
1938 "word of the object.") \
1939 \
1940 product(int, FastLockingSpins, 13, DIAGNOSTIC, \
1941 "Specifies the number of times fast locking will attempt to " \
1942 "CAS the markWord before inflating. Between each CAS it will " \
1943 "spin for exponentially more time, resulting in a total number " \
1944 "of spins on the order of O(2^value)") \
1945 range(1, 30) \
1946 \
1947 product(uint, TrimNativeHeapInterval, 0, \
1965 \
1966 product(bool, UseSecondarySupersCache, true, DIAGNOSTIC, \
1967 "Use secondary supers cache during subtype checks.") \
1968 \
1969 product(bool, UseSecondarySupersTable, false, DIAGNOSTIC, \
1970 "Use hash table to lookup secondary supers.") \
1971 \
1972 product(bool, VerifySecondarySupers, false, DIAGNOSTIC, \
1973 "Check that linear and hashed secondary lookups return the same result.") \
1974 \
1975 product(bool, StressSecondarySupers, false, DIAGNOSTIC, \
1976 "Use a terrible hash function in order to generate many collisions.") \
1977 \
1978 product(bool, UseThreadsLockThrottleLock, true, DIAGNOSTIC, \
1979 "Use an extra lock during Thread start and exit to alleviate" \
1980 "contention on Threads_lock.") \
1981 \
1982 develop(uint, BinarySearchThreshold, 16, \
1983 "Minimal number of elements in a sorted collection to prefer" \
1984 "binary search over simple linear search." ) \
1985 \
1986
1987 // end of RUNTIME_FLAGS
1988
1989 DECLARE_FLAGS(LP64_RUNTIME_FLAGS)
1990 DECLARE_ARCH_FLAGS(ARCH_FLAGS)
1991 DECLARE_FLAGS(RUNTIME_FLAGS)
1992 DECLARE_FLAGS(RUNTIME_OS_FLAGS)
1993
1994 #endif // SHARE_RUNTIME_GLOBALS_HPP
|
781 "Verify all arguments to JNI calls") \
782 \
783 product(bool, UseFastJNIAccessors, true, \
784 "Use optimized versions of Get<Primitive>Field") \
785 \
786 product(intx, MaxJNILocalCapacity, 65536, \
787 "Maximum allowable local JNI handle capacity to " \
788 "EnsureLocalCapacity() and PushLocalFrame(), " \
789 "where <= 0 is unlimited, default: 65536") \
790 range(min_intx, max_intx) \
791 \
792 product(bool, EagerXrunInit, false, \
793 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
794 "but not all -Xrun libraries may support the state of the VM " \
795 "at this time") \
796 \
797 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
798 "Number of OutOfMemoryErrors preallocated with backtrace") \
799 range(0, 1024) \
800 \
801 product(bool, PrintFieldLayout, false, DIAGNOSTIC, \
802 "Print field layout for each class") \
803 \
804 product(bool, PrintInlineLayout, false, DIAGNOSTIC, \
805 "Print field layout for each value class or class containing " \
806 "inlined value fields") \
807 \
808 product(bool, PrintFlatArrayLayout, false, DIAGNOSTIC, \
809 "Print array layout for each flattened value array") \
810 \
811 product(bool, UseArrayFlattening, true, DIAGNOSTIC, \
812 "Allow the JVM to flatten arrays of concrete value objects " \
813 "when it determines it is possible and beneficial to do so") \
814 \
815 product(bool, UseFieldFlattening, true, DIAGNOSTIC, \
816 "Allow the JVM to inline the fields of concrete value objects " \
817 "when it determines it is possible and beneficial to do so") \
818 \
819 product(bool, UseNullableAtomicValueFlattening, true, DIAGNOSTIC, \
820 "Allow the JVM to flatten some nullable atomic values") \
821 \
822 product(bool, UseNullFreeNonAtomicValueFlattening, true, EXPERIMENTAL, \
823 "Allow the JVM to flatten some null-free non-atomic values") \
824 \
825 product(bool, UseNullFreeAtomicValueFlattening, true, EXPERIMENTAL, \
826 "Allow the JVM to flatten some null-free atomic values") \
827 \
828 product(bool, UseNullableNonAtomicValueFlattening, true, DIAGNOSTIC, \
829 "Allow the JVM to flatten some strict final non-static fields") \
830 \
831 product(intx, FlatArrayElementMaxOops, 4, DIAGNOSTIC, \
832 "Max number of embedded object references in a value container " \
833 "before no flattening attempts are made, <0 indicates no limit") \
834 \
835 develop(ccstrlist, PrintInlineKlassFields, "", \
836 "Print fields collected by InlineKlass::collect_fields") \
837 \
838 /* Need to limit the extent of the padding to reasonable size. */\
839 /* 8K is well beyond the reasonable HW cache line size, even with */\
840 /* aggressive prefetching, while still leaving the room for segregating */\
841 /* among the distinct pages. */\
842 product(int, ContendedPaddingWidth, 128, \
843 "How many bytes to pad the fields/classes marked @Contended with")\
844 range(0, 8192) \
845 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \
846 \
847 product(bool, EnableContended, true, \
848 "Enable @Contended annotation support") \
849 \
850 product(bool, RestrictContended, true, \
851 "Restrict @Contended to trusted classes") \
852 \
853 product(int, DiagnoseSyncOnValueBasedClasses, 0, DIAGNOSTIC, \
854 "Detect and take action upon identifying synchronization on " \
855 "value based classes. Modes: " \
856 "0: off; " \
857 "1: exit with fatal error; " \
1771 "Create JMX Management Server") \
1772 \
1773 product(bool, DisableAttachMechanism, false, \
1774 "Disable mechanism that allows tools to attach to this VM") \
1775 \
1776 product(bool, StartAttachListener, false, \
1777 "Always start Attach Listener at VM startup") \
1778 \
1779 product(bool, EnableDynamicAgentLoading, true, \
1780 "Allow tools to load agents with the attach mechanism") \
1781 \
1782 product(bool, PrintConcurrentLocks, false, MANAGEABLE, \
1783 "Print java.util.concurrent locks in thread dump") \
1784 \
1785 product(bool, PrintMethodHandleStubs, false, DIAGNOSTIC, \
1786 "Print generated stub code for method handles") \
1787 \
1788 product(bool, VerifyMethodHandles, trueInDebug, DIAGNOSTIC, \
1789 "perform extra checks when constructing method handles") \
1790 \
1791 product(bool, IgnoreAssertUnsetFields, false, DIAGNOSTIC, \
1792 "Ignore assert_unset_fields") \
1793 \
1794 product(bool, ShowHiddenFrames, false, DIAGNOSTIC, \
1795 "show method handle implementation frames (usually hidden)") \
1796 \
1797 product(bool, ShowCarrierFrames, false, DIAGNOSTIC, \
1798 "show virtual threads' carrier frames in exceptions") \
1799 \
1800 product(bool, TrustFinalNonStaticFields, false, EXPERIMENTAL, \
1801 "trust final non-static declarations for constant folding") \
1802 \
1803 product(bool, FoldStableValues, true, DIAGNOSTIC, \
1804 "Optimize loads from stable fields (marked w/ @Stable)") \
1805 \
1806 product(int, UseBootstrapCallInfo, 1, DIAGNOSTIC, \
1807 "0: when resolving InDy or ConDy, force all BSM arguments to be " \
1808 "resolved before the bootstrap method is called; 1: when a BSM " \
1809 "that may accept a BootstrapCallInfo is detected, use that API " \
1810 "to pass BSM arguments, which allows the BSM to delay their " \
1811 "resolution; 2+: stress test the BCI API by calling more BSMs " \
1812 "via that API, instead of with the eagerly-resolved array.") \
1813 \
1945 "On internal errors, include registers in error report.") \
1946 \
1947 product(bool, UseSwitchProfiling, true, DIAGNOSTIC, \
1948 "leverage profiling for table/lookup switch") \
1949 \
1950 develop(bool, TraceMemoryWriteback, false, \
1951 "Trace memory writeback operations") \
1952 \
1953 JFR_ONLY(product(bool, FlightRecorder, false, \
1954 "(Deprecated) Enable Flight Recorder")) \
1955 \
1956 JFR_ONLY(product(ccstr, FlightRecorderOptions, nullptr, \
1957 "Flight Recorder options")) \
1958 \
1959 JFR_ONLY(product(ccstr, StartFlightRecording, nullptr, \
1960 "Start flight recording with options")) \
1961 \
1962 product(bool, UseFastUnorderedTimeStamps, false, EXPERIMENTAL, \
1963 "Use platform unstable time where supported for timestamps only") \
1964 \
1965 product_pd(bool, InlineTypePassFieldsAsArgs, DIAGNOSTIC, \
1966 "Pass each inline type field as an argument at calls") \
1967 \
1968 product_pd(bool, InlineTypeReturnedAsFields, DIAGNOSTIC, \
1969 "Return fields instead of an inline type reference") \
1970 \
1971 develop(bool, StressCallingConvention, false, \
1972 "Stress the scalarized calling convention.") \
1973 \
1974 develop(bool, PreloadClasses, true, \
1975 "Preloading all classes from the LoadableDescriptors attribute") \
1976 \
1977 product(ccstrlist, ForceNonTearable, "", DIAGNOSTIC, \
1978 "List of inline classes which are forced to be atomic " \
1979 "(whitespace and commas separate names, " \
1980 "and leading and trailing stars '*' are wildcards)") \
1981 \
1982 product(bool, DeoptimizeNMethodBarriersALot, false, DIAGNOSTIC, \
1983 "Make nmethod barriers deoptimise a lot.") \
1984 \
1985 develop(bool, VerifyCrossModifyFence, \
1986 false AARCH64_ONLY(DEBUG_ONLY(||true)), \
1987 "Mark all threads after a safepoint, and clear on a modify " \
1988 "fence. Add cleanliness checks.") \
1989 \
1990 product(bool, UseObjectMonitorTable, true, DIAGNOSTIC, \
1991 "Use a table to record inflated monitors rather than the first " \
1992 "word of the object.") \
1993 \
1994 product(int, FastLockingSpins, 13, DIAGNOSTIC, \
1995 "Specifies the number of times fast locking will attempt to " \
1996 "CAS the markWord before inflating. Between each CAS it will " \
1997 "spin for exponentially more time, resulting in a total number " \
1998 "of spins on the order of O(2^value)") \
1999 range(1, 30) \
2000 \
2001 product(uint, TrimNativeHeapInterval, 0, \
2019 \
2020 product(bool, UseSecondarySupersCache, true, DIAGNOSTIC, \
2021 "Use secondary supers cache during subtype checks.") \
2022 \
2023 product(bool, UseSecondarySupersTable, false, DIAGNOSTIC, \
2024 "Use hash table to lookup secondary supers.") \
2025 \
2026 product(bool, VerifySecondarySupers, false, DIAGNOSTIC, \
2027 "Check that linear and hashed secondary lookups return the same result.") \
2028 \
2029 product(bool, StressSecondarySupers, false, DIAGNOSTIC, \
2030 "Use a terrible hash function in order to generate many collisions.") \
2031 \
2032 product(bool, UseThreadsLockThrottleLock, true, DIAGNOSTIC, \
2033 "Use an extra lock during Thread start and exit to alleviate" \
2034 "contention on Threads_lock.") \
2035 \
2036 develop(uint, BinarySearchThreshold, 16, \
2037 "Minimal number of elements in a sorted collection to prefer" \
2038 "binary search over simple linear search." ) \
2039
2040 // end of RUNTIME_FLAGS
2041
2042 DECLARE_FLAGS(LP64_RUNTIME_FLAGS)
2043 DECLARE_ARCH_FLAGS(ARCH_FLAGS)
2044 DECLARE_FLAGS(RUNTIME_FLAGS)
2045 DECLARE_FLAGS(RUNTIME_OS_FLAGS)
2046
2047 #endif // SHARE_RUNTIME_GLOBALS_HPP
|