1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/runtime/interfaceSupport.cpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,287 @@
1.4 +/*
1.5 + * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#include "gc_implementation/shared/markSweep.hpp"
1.30 +#include "gc_interface/collectedHeap.hpp"
1.31 +#include "gc_interface/collectedHeap.inline.hpp"
1.32 +#include "memory/genCollectedHeap.hpp"
1.33 +#include "memory/resourceArea.hpp"
1.34 +#include "runtime/init.hpp"
1.35 +#include "runtime/interfaceSupport.hpp"
1.36 +#include "runtime/threadLocalStorage.hpp"
1.37 +#include "runtime/vframe.hpp"
1.38 +#include "utilities/preserveException.hpp"
1.39 +
1.40 +PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
1.41 +
1.42 +// Implementation of InterfaceSupport
1.43 +
1.44 +#ifdef ASSERT
1.45 +
1.46 +long InterfaceSupport::_number_of_calls = 0;
1.47 +long InterfaceSupport::_scavenge_alot_counter = 1;
1.48 +long InterfaceSupport::_fullgc_alot_counter = 1;
1.49 +long InterfaceSupport::_fullgc_alot_invocation = 0;
1.50 +
1.51 +Histogram* RuntimeHistogram;
1.52 +
1.53 +RuntimeHistogramElement::RuntimeHistogramElement(const char* elementName) {
1.54 + static volatile jint RuntimeHistogram_lock = 0;
1.55 + _name = elementName;
1.56 + uintx count = 0;
1.57 +
1.58 + while (Atomic::cmpxchg(1, &RuntimeHistogram_lock, 0) != 0) {
1.59 + while (OrderAccess::load_acquire(&RuntimeHistogram_lock) != 0) {
1.60 + count +=1;
1.61 + if ( (WarnOnStalledSpinLock > 0)
1.62 + && (count % WarnOnStalledSpinLock == 0)) {
1.63 + warning("RuntimeHistogram_lock seems to be stalled");
1.64 + }
1.65 + }
1.66 + }
1.67 +
1.68 + if (RuntimeHistogram == NULL) {
1.69 + RuntimeHistogram = new Histogram("VM Runtime Call Counts",200);
1.70 + }
1.71 +
1.72 + RuntimeHistogram->add_element(this);
1.73 + Atomic::dec(&RuntimeHistogram_lock);
1.74 +}
1.75 +
1.76 +void InterfaceSupport::trace(const char* result_type, const char* header) {
1.77 + tty->print_cr("%6d %s", _number_of_calls, header);
1.78 +}
1.79 +
1.80 +void InterfaceSupport::gc_alot() {
1.81 + Thread *thread = Thread::current();
1.82 + if (!thread->is_Java_thread()) return; // Avoid concurrent calls
1.83 + // Check for new, not quite initialized thread. A thread in new mode cannot initiate a GC.
1.84 + JavaThread *current_thread = (JavaThread *)thread;
1.85 + if (current_thread->active_handles() == NULL) return;
1.86 +
1.87 + // Short-circuit any possible re-entrant gc-a-lot attempt
1.88 + if (thread->skip_gcalot()) return;
1.89 +
1.90 + if (is_init_completed()) {
1.91 +
1.92 + if (++_fullgc_alot_invocation < FullGCALotStart) {
1.93 + return;
1.94 + }
1.95 +
1.96 + // Use this line if you want to block at a specific point,
1.97 + // e.g. one number_of_calls/scavenge/gc before you got into problems
1.98 + if (FullGCALot) _fullgc_alot_counter--;
1.99 +
1.100 + // Check if we should force a full gc
1.101 + if (_fullgc_alot_counter == 0) {
1.102 + // Release dummy so objects are forced to move
1.103 + if (!Universe::release_fullgc_alot_dummy()) {
1.104 + warning("FullGCALot: Unable to release more dummies at bottom of heap");
1.105 + }
1.106 + HandleMark hm(thread);
1.107 + Universe::heap()->collect(GCCause::_full_gc_alot);
1.108 + unsigned int invocations = Universe::heap()->total_full_collections();
1.109 + // Compute new interval
1.110 + if (FullGCALotInterval > 1) {
1.111 + _fullgc_alot_counter = 1+(long)((double)FullGCALotInterval*os::random()/(max_jint+1.0));
1.112 + if (PrintGCDetails && Verbose) {
1.113 + tty->print_cr("Full gc no: %u\tInterval: %d", invocations,
1.114 + _fullgc_alot_counter);
1.115 + }
1.116 + } else {
1.117 + _fullgc_alot_counter = 1;
1.118 + }
1.119 + // Print progress message
1.120 + if (invocations % 100 == 0) {
1.121 + if (PrintGCDetails && Verbose) tty->print_cr("Full gc no: %u", invocations);
1.122 + }
1.123 + } else {
1.124 + if (ScavengeALot) _scavenge_alot_counter--;
1.125 + // Check if we should force a scavenge
1.126 + if (_scavenge_alot_counter == 0) {
1.127 + HandleMark hm(thread);
1.128 + Universe::heap()->collect(GCCause::_scavenge_alot);
1.129 + unsigned int invocations = Universe::heap()->total_collections() - Universe::heap()->total_full_collections();
1.130 + // Compute new interval
1.131 + if (ScavengeALotInterval > 1) {
1.132 + _scavenge_alot_counter = 1+(long)((double)ScavengeALotInterval*os::random()/(max_jint+1.0));
1.133 + if (PrintGCDetails && Verbose) {
1.134 + tty->print_cr("Scavenge no: %u\tInterval: %d", invocations,
1.135 + _scavenge_alot_counter);
1.136 + }
1.137 + } else {
1.138 + _scavenge_alot_counter = 1;
1.139 + }
1.140 + // Print progress message
1.141 + if (invocations % 1000 == 0) {
1.142 + if (PrintGCDetails && Verbose) tty->print_cr("Scavenge no: %u", invocations);
1.143 + }
1.144 + }
1.145 + }
1.146 + }
1.147 +}
1.148 +
1.149 +
1.150 +vframe* vframe_array[50];
1.151 +int walk_stack_counter = 0;
1.152 +
1.153 +void InterfaceSupport::walk_stack_from(vframe* start_vf) {
1.154 + // walk
1.155 + int i = 0;
1.156 + for (vframe* f = start_vf; f; f = f->sender() ) {
1.157 + if (i < 50) vframe_array[i++] = f;
1.158 + }
1.159 +}
1.160 +
1.161 +
1.162 +void InterfaceSupport::walk_stack() {
1.163 + JavaThread* thread = JavaThread::current();
1.164 + walk_stack_counter++;
1.165 + if (!thread->has_last_Java_frame()) return;
1.166 + ResourceMark rm(thread);
1.167 + RegisterMap reg_map(thread);
1.168 + walk_stack_from(thread->last_java_vframe(®_map));
1.169 +}
1.170 +
1.171 +
1.172 +# ifdef ENABLE_ZAP_DEAD_LOCALS
1.173 +
1.174 +static int zap_traversals = 0;
1.175 +
1.176 +void InterfaceSupport::zap_dead_locals_old() {
1.177 + JavaThread* thread = JavaThread::current();
1.178 + if (zap_traversals == -1) // edit constant for debugging
1.179 + warning("I am here");
1.180 + int zap_frame_count = 0; // count frames to help debugging
1.181 + for (StackFrameStream sfs(thread); !sfs.is_done(); sfs.next()) {
1.182 + sfs.current()->zap_dead_locals(thread, sfs.register_map());
1.183 + ++zap_frame_count;
1.184 + }
1.185 + ++zap_traversals;
1.186 +}
1.187 +
1.188 +# endif
1.189 +
1.190 +
1.191 +int deoptimizeAllCounter = 0;
1.192 +int zombieAllCounter = 0;
1.193 +
1.194 +
1.195 +void InterfaceSupport::zombieAll() {
1.196 + if (is_init_completed() && zombieAllCounter > ZombieALotInterval) {
1.197 + zombieAllCounter = 0;
1.198 + VM_ZombieAll op;
1.199 + VMThread::execute(&op);
1.200 + } else {
1.201 + zombieAllCounter++;
1.202 + }
1.203 +}
1.204 +
1.205 +void InterfaceSupport::unlinkSymbols() {
1.206 + VM_UnlinkSymbols op;
1.207 + VMThread::execute(&op);
1.208 +}
1.209 +
1.210 +void InterfaceSupport::deoptimizeAll() {
1.211 + if (is_init_completed() ) {
1.212 + if (DeoptimizeALot && deoptimizeAllCounter > DeoptimizeALotInterval) {
1.213 + deoptimizeAllCounter = 0;
1.214 + VM_DeoptimizeAll op;
1.215 + VMThread::execute(&op);
1.216 + } else if (DeoptimizeRandom && (deoptimizeAllCounter & 0x1f) == (os::random() & 0x1f)) {
1.217 + VM_DeoptimizeAll op;
1.218 + VMThread::execute(&op);
1.219 + }
1.220 + }
1.221 + deoptimizeAllCounter++;
1.222 +}
1.223 +
1.224 +
1.225 +void InterfaceSupport::stress_derived_pointers() {
1.226 +#ifdef COMPILER2
1.227 + JavaThread *thread = JavaThread::current();
1.228 + if (!is_init_completed()) return;
1.229 + ResourceMark rm(thread);
1.230 + bool found = false;
1.231 + for (StackFrameStream sfs(thread); !sfs.is_done() && !found; sfs.next()) {
1.232 + CodeBlob* cb = sfs.current()->cb();
1.233 + if (cb != NULL && cb->oop_maps() ) {
1.234 + // Find oopmap for current method
1.235 + OopMap* map = cb->oop_map_for_return_address(sfs.current()->pc());
1.236 + assert(map != NULL, "no oopmap found for pc");
1.237 + found = map->has_derived_pointer();
1.238 + }
1.239 + }
1.240 + if (found) {
1.241 + // $$$ Not sure what to do here.
1.242 + /*
1.243 + Scavenge::invoke(0);
1.244 + */
1.245 + }
1.246 +#endif
1.247 +}
1.248 +
1.249 +
1.250 +void InterfaceSupport::verify_stack() {
1.251 + JavaThread* thread = JavaThread::current();
1.252 + ResourceMark rm(thread);
1.253 + // disabled because it throws warnings that oop maps should only be accessed
1.254 + // in VM thread or during debugging
1.255 +
1.256 + if (!thread->has_pending_exception()) {
1.257 + // verification does not work if there are pending exceptions
1.258 + StackFrameStream sfs(thread);
1.259 + CodeBlob* cb = sfs.current()->cb();
1.260 + // In case of exceptions we might not have a runtime_stub on
1.261 + // top of stack, hence, all callee-saved registers are not going
1.262 + // to be setup correctly, hence, we cannot do stack verify
1.263 + if (cb != NULL && !(cb->is_runtime_stub() || cb->is_uncommon_trap_stub())) return;
1.264 +
1.265 + for (; !sfs.is_done(); sfs.next()) {
1.266 + sfs.current()->verify(sfs.register_map());
1.267 + }
1.268 + }
1.269 +}
1.270 +
1.271 +
1.272 +void InterfaceSupport::verify_last_frame() {
1.273 + JavaThread* thread = JavaThread::current();
1.274 + ResourceMark rm(thread);
1.275 + RegisterMap reg_map(thread);
1.276 + frame fr = thread->last_frame();
1.277 + fr.verify(®_map);
1.278 +}
1.279 +
1.280 +
1.281 +#endif // ASSERT
1.282 +
1.283 +
1.284 +void InterfaceSupport_init() {
1.285 +#ifdef ASSERT
1.286 + if (ScavengeALot || FullGCALot) {
1.287 + srand(ScavengeALotInterval * FullGCALotInterval);
1.288 + }
1.289 +#endif
1.290 +}
