# HG changeset patch # User minqi # Date 1286484580 25200 # Node ID 75efcee5ac47f2f0dc50a9e07f6d860ddeb30c19 # Parent 0915f9be781c13221cacf6ea8af9cb9af4c43ae0 6966589: hs16-b08 causes java.lang.StackOverflowError Reviewed-by: mchung, dholmes, chrisphi diff -r 0915f9be781c -r 75efcee5ac47 src/share/vm/classfile/classLoader.cpp --- a/src/share/vm/classfile/classLoader.cpp Thu Jan 13 22:54:23 2011 -0800 +++ b/src/share/vm/classfile/classLoader.cpp Thu Oct 07 13:49:40 2010 -0700 @@ -1382,3 +1382,61 @@ } #endif //PRODUCT + +// Please keep following two functions at end of this file. With them placed at top or in middle of the file, +// they could get inlined by agressive compiler, an unknown trick, see bug 6966589. +void PerfClassTraceTime::initialize() { + if (!UsePerfData) return; + + if (_eventp != NULL) { + // increment the event counter + _eventp->inc(); + } + + // stop the current active thread-local timer to measure inclusive time + _prev_active_event = -1; + for (int i=0; i < EVENT_TYPE_COUNT; i++) { + if (_timers[i].is_active()) { + assert(_prev_active_event == -1, "should have only one active timer"); + _prev_active_event = i; + _timers[i].stop(); + } + } + + if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) { + // start the inclusive timer if not recursively called + _t.start(); + } + + // start thread-local timer of the given event type + if (!_timers[_event_type].is_active()) { + _timers[_event_type].start(); + } +} + +PerfClassTraceTime::~PerfClassTraceTime() { + if (!UsePerfData) return; + + // stop the thread-local timer as the event completes + // and resume the thread-local timer of the event next on the stack + _timers[_event_type].stop(); + jlong selftime = _timers[_event_type].ticks(); + + if (_prev_active_event >= 0) { + _timers[_prev_active_event].start(); + } + + if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return; + + // increment the counters only on the leaf call + _t.stop(); + _timep->inc(_t.ticks()); + if (_selftimep != NULL) { + _selftimep->inc(selftime); + } + // add all class loading related event selftime to the accumulated time counter + ClassLoader::perf_accumulated_time()->inc(selftime); + + // reset the timer + _timers[_event_type].reset(); +} diff -r 0915f9be781c -r 75efcee5ac47 src/share/vm/classfile/classLoader.hpp --- a/src/share/vm/classfile/classLoader.hpp Thu Jan 13 22:54:23 2011 -0800 +++ b/src/share/vm/classfile/classLoader.hpp Thu Oct 07 13:49:40 2010 -0700 @@ -356,111 +356,57 @@ // (i.e. only one event type) are active at a time even multiple PerfClassTraceTime // instances have been created as multiple events are happening. class PerfClassTraceTime { - public: - enum { - CLASS_LOAD = 0, - PARSE_CLASS = 1, - CLASS_LINK = 2, - CLASS_VERIFY = 3, - CLASS_CLINIT = 4, - DEFINE_CLASS = 5, - EVENT_TYPE_COUNT = 6 - }; - protected: - // _t tracks time from initialization to destruction of this timer instance - // including time for all other event types, and recursive calls of this type. - // When a timer is called recursively, the elapsedTimer _t would not be used. - elapsedTimer _t; - PerfLongCounter* _timep; - PerfLongCounter* _selftimep; - PerfLongCounter* _eventp; - // pointer to thread-local recursion counter and timer array - // The thread_local timers track cumulative time for specific event types - // exclusive of time for other event types, but including recursive calls - // of the same type. - int* _recursion_counters; - elapsedTimer* _timers; - int _event_type; - int _prev_active_event; - - public: - - inline PerfClassTraceTime(PerfLongCounter* timep, /* counter incremented with inclusive time */ - PerfLongCounter* selftimep, /* counter incremented with exclusive time */ - PerfLongCounter* eventp, /* event counter */ - int* recursion_counters, /* thread-local recursion counter array */ - elapsedTimer* timers, /* thread-local timer array */ - int type /* event type */ ) : - _timep(timep), _selftimep(selftimep), _eventp(eventp), _recursion_counters(recursion_counters), _timers(timers), _event_type(type) { - initialize(); - } - - inline PerfClassTraceTime(PerfLongCounter* timep, /* counter incremented with inclusive time */ - elapsedTimer* timers, /* thread-local timer array */ - int type /* event type */ ) : - _timep(timep), _selftimep(NULL), _eventp(NULL), _recursion_counters(NULL), _timers(timers), _event_type(type) { - initialize(); - } - - void initialize() { - if (!UsePerfData) return; + public: + enum { + CLASS_LOAD = 0, + PARSE_CLASS = 1, + CLASS_LINK = 2, + CLASS_VERIFY = 3, + CLASS_CLINIT = 4, + DEFINE_CLASS = 5, + EVENT_TYPE_COUNT = 6 + }; + protected: + // _t tracks time from initialization to destruction of this timer instance + // including time for all other event types, and recursive calls of this type. + // When a timer is called recursively, the elapsedTimer _t would not be used. + elapsedTimer _t; + PerfLongCounter* _timep; + PerfLongCounter* _selftimep; + PerfLongCounter* _eventp; + // pointer to thread-local recursion counter and timer array + // The thread_local timers track cumulative time for specific event types + // exclusive of time for other event types, but including recursive calls + // of the same type. + int* _recursion_counters; + elapsedTimer* _timers; + int _event_type; + int _prev_active_event; - if (_eventp != NULL) { - // increment the event counter - _eventp->inc(); - } + public: - // stop the current active thread-local timer to measure inclusive time - _prev_active_event = -1; - for (int i=0; i < EVENT_TYPE_COUNT; i++) { - if (_timers[i].is_active()) { - assert(_prev_active_event == -1, "should have only one active timer"); - _prev_active_event = i; - _timers[i].stop(); - } - } - - if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) { - // start the inclusive timer if not recursively called - _t.start(); - } - - // start thread-local timer of the given event type - if (!_timers[_event_type].is_active()) { - _timers[_event_type].start(); - } - } + inline PerfClassTraceTime(PerfLongCounter* timep, /* counter incremented with inclusive time */ + PerfLongCounter* selftimep, /* counter incremented with exclusive time */ + PerfLongCounter* eventp, /* event counter */ + int* recursion_counters, /* thread-local recursion counter array */ + elapsedTimer* timers, /* thread-local timer array */ + int type /* event type */ ) : + _timep(timep), _selftimep(selftimep), _eventp(eventp), _recursion_counters(recursion_counters), _timers(timers), _event_type(type) { + initialize(); + } - inline void suspend() { _t.stop(); _timers[_event_type].stop(); } - inline void resume() { _t.start(); _timers[_event_type].start(); } - - ~PerfClassTraceTime() { - if (!UsePerfData) return; - - // stop the thread-local timer as the event completes - // and resume the thread-local timer of the event next on the stack - _timers[_event_type].stop(); - jlong selftime = _timers[_event_type].ticks(); - - if (_prev_active_event >= 0) { - _timers[_prev_active_event].start(); - } + inline PerfClassTraceTime(PerfLongCounter* timep, /* counter incremented with inclusive time */ + elapsedTimer* timers, /* thread-local timer array */ + int type /* event type */ ) : + _timep(timep), _selftimep(NULL), _eventp(NULL), _recursion_counters(NULL), _timers(timers), _event_type(type) { + initialize(); + } - if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return; + inline void suspend() { _t.stop(); _timers[_event_type].stop(); } + inline void resume() { _t.start(); _timers[_event_type].start(); } - // increment the counters only on the leaf call - _t.stop(); - _timep->inc(_t.ticks()); - if (_selftimep != NULL) { - _selftimep->inc(selftime); - } - // add all class loading related event selftime to the accumulated time counter - ClassLoader::perf_accumulated_time()->inc(selftime); - - // reset the timer - _timers[_event_type].reset(); - } + ~PerfClassTraceTime(); + void initialize(); }; - #endif // SHARE_VM_CLASSFILE_CLASSLOADER_HPP