1805 // Assumes classes in the SystemDictionary are only unloaded at a safepoint |
1805 // Assumes classes in the SystemDictionary are only unloaded at a safepoint |
1806 // Note: anonymous classes are not in the SD. |
1806 // Note: anonymous classes are not in the SD. |
1807 bool SystemDictionary::do_unloading(GCTimer* gc_timer) { |
1807 bool SystemDictionary::do_unloading(GCTimer* gc_timer) { |
1808 |
1808 |
1809 bool unloading_occurred; |
1809 bool unloading_occurred; |
|
1810 bool is_concurrent = !SafepointSynchronize::is_at_safepoint(); |
1810 { |
1811 { |
1811 GCTraceTime(Debug, gc, phases) t("ClassLoaderData", gc_timer); |
1812 GCTraceTime(Debug, gc, phases) t("ClassLoaderData", gc_timer); |
1812 |
1813 assert_locked_or_safepoint(ClassLoaderDataGraph_lock); // caller locks. |
1813 // First, mark for unload all ClassLoaderData referencing a dead class loader. |
1814 // First, mark for unload all ClassLoaderData referencing a dead class loader. |
1814 unloading_occurred = ClassLoaderDataGraph::do_unloading(); |
1815 unloading_occurred = ClassLoaderDataGraph::do_unloading(); |
1815 if (unloading_occurred) { |
1816 if (unloading_occurred) { |
|
1817 MutexLockerEx ml2(is_concurrent ? Module_lock : NULL); |
1816 JFR_ONLY(Jfr::on_unloading_classes();) |
1818 JFR_ONLY(Jfr::on_unloading_classes();) |
|
1819 MutexLockerEx ml1(is_concurrent ? SystemDictionary_lock : NULL); |
1817 ClassLoaderDataGraph::clean_module_and_package_info(); |
1820 ClassLoaderDataGraph::clean_module_and_package_info(); |
1818 } |
1821 } |
1819 } |
1822 } |
1820 |
1823 |
1821 // TODO: just return if !unloading_occurred. |
1824 // Cleanup ResolvedMethodTable even if no unloading occurred. |
|
1825 { |
|
1826 GCTraceTime(Debug, gc, phases) t("ResolvedMethodTable", gc_timer); |
|
1827 ResolvedMethodTable::trigger_cleanup(); |
|
1828 } |
|
1829 |
1822 if (unloading_occurred) { |
1830 if (unloading_occurred) { |
1823 { |
1831 { |
1824 GCTraceTime(Debug, gc, phases) t("SymbolTable", gc_timer); |
1832 GCTraceTime(Debug, gc, phases) t("SymbolTable", gc_timer); |
1825 // Check if there's work to do in the SymbolTable |
1833 // Check if there's work to do in the SymbolTable |
1826 SymbolTable::do_check_concurrent_work(); |
1834 SymbolTable::do_check_concurrent_work(); |
1827 } |
1835 } |
1828 |
1836 |
1829 { |
1837 { |
|
1838 MutexLockerEx ml(is_concurrent ? SystemDictionary_lock : NULL); |
1830 GCTraceTime(Debug, gc, phases) t("Dictionary", gc_timer); |
1839 GCTraceTime(Debug, gc, phases) t("Dictionary", gc_timer); |
1831 constraints()->purge_loader_constraints(); |
1840 constraints()->purge_loader_constraints(); |
1832 resolution_errors()->purge_resolution_errors(); |
1841 resolution_errors()->purge_resolution_errors(); |
1833 } |
1842 } |
1834 } |
1843 |
1835 |
1844 { |
1836 { |
1845 GCTraceTime(Debug, gc, phases) t("ResolvedMethodTable", gc_timer); |
1837 GCTraceTime(Debug, gc, phases) t("ProtectionDomainCacheTable", gc_timer); |
1846 // Oops referenced by the protection domain cache table may get unreachable independently |
1838 // Oops referenced by the protection domain cache table may get unreachable independently |
1847 // of the class loader (eg. cached protection domain oops). So we need to |
1839 // of the class loader (eg. cached protection domain oops). So we need to |
1848 // explicitly unlink them here. |
1840 // explicitly unlink them here. |
1849 // All protection domain oops are linked to the caller class, so if nothing |
1841 _pd_cache_table->trigger_cleanup(); |
1850 // unloads, this is not needed. |
1842 } |
1851 _pd_cache_table->trigger_cleanup(); |
1843 |
1852 } |
1844 { |
|
1845 GCTraceTime(Debug, gc, phases) t("ResolvedMethodTable", gc_timer); |
|
1846 ResolvedMethodTable::trigger_cleanup(); |
|
1847 } |
1853 } |
1848 |
1854 |
1849 return unloading_occurred; |
1855 return unloading_occurred; |
1850 } |
1856 } |
1851 |
1857 |