| File: | jdk/src/hotspot/share/runtime/stackWatermark.cpp |
| Warning: | line 314, column 5 Called C++ object pointer is null |
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| 1 | /* | |||
| 2 | * Copyright (c) 2020, 2021, Oracle and/or its affiliates. All rights reserved. | |||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |||
| 4 | * | |||
| 5 | * This code is free software; you can redistribute it and/or modify it | |||
| 6 | * under the terms of the GNU General Public License version 2 only, as | |||
| 7 | * published by the Free Software Foundation. | |||
| 8 | * | |||
| 9 | * This code is distributed in the hope that it will be useful, but WITHOUT | |||
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |||
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |||
| 12 | * version 2 for more details (a copy is included in the LICENSE file that | |||
| 13 | * accompanied this code). | |||
| 14 | * | |||
| 15 | * You should have received a copy of the GNU General Public License version | |||
| 16 | * 2 along with this work; if not, write to the Free Software Foundation, | |||
| 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |||
| 18 | * | |||
| 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |||
| 20 | * or visit www.oracle.com if you need additional information or have any | |||
| 21 | * questions. | |||
| 22 | * | |||
| 23 | */ | |||
| 24 | ||||
| 25 | #include "precompiled.hpp" | |||
| 26 | #include "logging/log.hpp" | |||
| 27 | #include "runtime/atomic.hpp" | |||
| 28 | #include "runtime/frame.inline.hpp" | |||
| 29 | #include "runtime/osThread.hpp" | |||
| 30 | #include "runtime/safepoint.hpp" | |||
| 31 | #include "runtime/stackFrameStream.inline.hpp" | |||
| 32 | #include "runtime/stackWatermark.inline.hpp" | |||
| 33 | #include "runtime/thread.hpp" | |||
| 34 | #include "utilities/debug.hpp" | |||
| 35 | #include "utilities/globalDefinitions.hpp" | |||
| 36 | #include "utilities/macros.hpp" | |||
| 37 | #include "utilities/preserveException.hpp" | |||
| 38 | ||||
| 39 | class StackWatermarkFramesIterator : public CHeapObj<mtInternal> { | |||
| 40 | JavaThread* _jt; | |||
| 41 | uintptr_t _caller; | |||
| 42 | uintptr_t _callee; | |||
| 43 | StackFrameStream _frame_stream; | |||
| 44 | StackWatermark& _owner; | |||
| 45 | bool _is_done; | |||
| 46 | ||||
| 47 | void set_watermark(uintptr_t sp); | |||
| 48 | RegisterMap& register_map(); | |||
| 49 | frame& current(); | |||
| 50 | void next(); | |||
| 51 | ||||
| 52 | public: | |||
| 53 | StackWatermarkFramesIterator(StackWatermark& owner); | |||
| 54 | uintptr_t caller() const { return _caller; } | |||
| 55 | uintptr_t callee() const { return _callee; } | |||
| 56 | void process_one(void* context); | |||
| 57 | void process_all(void* context); | |||
| 58 | bool has_next() const; | |||
| 59 | }; | |||
| 60 | ||||
| 61 | void StackWatermarkFramesIterator::set_watermark(uintptr_t sp) { | |||
| 62 | if (!has_next()) { | |||
| 63 | return; | |||
| 64 | } | |||
| 65 | ||||
| 66 | if (_callee == 0) { | |||
| 67 | _callee = sp; | |||
| 68 | } else if (_caller == 0) { | |||
| 69 | _caller = sp; | |||
| 70 | } else { | |||
| 71 | _callee = _caller; | |||
| 72 | _caller = sp; | |||
| 73 | } | |||
| 74 | } | |||
| 75 | ||||
| 76 | // This class encapsulates various marks we need to deal with calling the | |||
| 77 | // frame processing code from arbitrary points in the runtime. It is mostly | |||
| 78 | // due to problems that we might want to eventually clean up inside of the | |||
| 79 | // frame processing code, such as creating random handles even though there | |||
| 80 | // is no safepoint to protect against, and fiddling around with exceptions. | |||
| 81 | class StackWatermarkProcessingMark { | |||
| 82 | ResetNoHandleMark _rnhm; | |||
| 83 | HandleMark _hm; | |||
| 84 | PreserveExceptionMark _pem; | |||
| 85 | ResourceMark _rm; | |||
| 86 | ||||
| 87 | public: | |||
| 88 | StackWatermarkProcessingMark(Thread* thread) : | |||
| 89 | _rnhm(), | |||
| 90 | _hm(thread), | |||
| 91 | _pem(thread), | |||
| 92 | _rm(thread) { } | |||
| 93 | }; | |||
| 94 | ||||
| 95 | void StackWatermarkFramesIterator::process_one(void* context) { | |||
| 96 | StackWatermarkProcessingMark swpm(Thread::current()); | |||
| 97 | while (has_next()) { | |||
| 98 | frame f = current(); | |||
| 99 | uintptr_t sp = reinterpret_cast<uintptr_t>(f.sp()); | |||
| 100 | bool frame_has_barrier = StackWatermark::has_barrier(f); | |||
| 101 | _owner.process(f, register_map(), context); | |||
| 102 | next(); | |||
| 103 | if (frame_has_barrier) { | |||
| 104 | set_watermark(sp); | |||
| 105 | break; | |||
| 106 | } | |||
| 107 | } | |||
| 108 | } | |||
| 109 | ||||
| 110 | void StackWatermarkFramesIterator::process_all(void* context) { | |||
| 111 | const uintptr_t frames_per_poll_gc = 5; | |||
| 112 | ||||
| 113 | ResourceMark rm; | |||
| 114 | log_info(stackbarrier)(!(LogImpl<(LogTag::_stackbarrier), (LogTag::__NO_TAG), (LogTag ::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag:: __NO_TAG)>::is_level(LogLevel::Info))) ? (void)0 : LogImpl <(LogTag::_stackbarrier), (LogTag::__NO_TAG), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG) >::write<LogLevel::Info>("Processing whole stack for tid %d", | |||
| 115 | _jt->osthread()->thread_id()); | |||
| 116 | uint i = 0; | |||
| 117 | while (has_next()) { | |||
| 118 | frame f = current(); | |||
| 119 | uintptr_t sp = reinterpret_cast<uintptr_t>(f.sp()); | |||
| 120 | assert(sp >= _caller, "invariant")do { if (!(sp >= _caller)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/stackWatermark.cpp" , 120, "assert(" "sp >= _caller" ") failed", "invariant"); ::breakpoint(); } } while (0); | |||
| 121 | bool frame_has_barrier = StackWatermark::has_barrier(f); | |||
| 122 | _owner.process(f, register_map(), context); | |||
| 123 | next(); | |||
| 124 | if (frame_has_barrier) { | |||
| 125 | set_watermark(sp); | |||
| 126 | if (++i == frames_per_poll_gc) { | |||
| 127 | // Yield every N frames so mutator can progress faster. | |||
| 128 | i = 0; | |||
| 129 | _owner.yield_processing(); | |||
| 130 | } | |||
| 131 | } | |||
| 132 | } | |||
| 133 | } | |||
| 134 | ||||
| 135 | StackWatermarkFramesIterator::StackWatermarkFramesIterator(StackWatermark& owner) : | |||
| 136 | _jt(owner._jt), | |||
| 137 | _caller(0), | |||
| 138 | _callee(0), | |||
| 139 | _frame_stream(owner._jt, true /* update_registers */, false /* process_frames */), | |||
| 140 | _owner(owner), | |||
| 141 | _is_done(_frame_stream.is_done()) { | |||
| 142 | } | |||
| 143 | ||||
| 144 | frame& StackWatermarkFramesIterator::current() { | |||
| 145 | return *_frame_stream.current(); | |||
| 146 | } | |||
| 147 | ||||
| 148 | RegisterMap& StackWatermarkFramesIterator::register_map() { | |||
| 149 | return *_frame_stream.register_map(); | |||
| 150 | } | |||
| 151 | ||||
| 152 | bool StackWatermarkFramesIterator::has_next() const { | |||
| 153 | return !_is_done; | |||
| 154 | } | |||
| 155 | ||||
| 156 | void StackWatermarkFramesIterator::next() { | |||
| 157 | _frame_stream.next(); | |||
| 158 | _is_done = _frame_stream.is_done(); | |||
| 159 | } | |||
| 160 | ||||
| 161 | StackWatermark::StackWatermark(JavaThread* jt, StackWatermarkKind kind, uint32_t epoch) : | |||
| 162 | _state(StackWatermarkState::create(epoch, true /* is_done */)), | |||
| 163 | _watermark(0), | |||
| 164 | _next(NULL__null), | |||
| 165 | _jt(jt), | |||
| 166 | _iterator(NULL__null), | |||
| 167 | _lock(Mutex::stackwatermark, "StackWatermark_lock"), | |||
| 168 | _kind(kind), | |||
| 169 | _linked_watermark(NULL__null) { | |||
| 170 | } | |||
| 171 | ||||
| 172 | StackWatermark::~StackWatermark() { | |||
| 173 | delete _iterator; | |||
| 174 | } | |||
| 175 | ||||
| 176 | #ifdef ASSERT1 | |||
| 177 | void StackWatermark::assert_is_frame_safe(const frame& f) { | |||
| 178 | MutexLocker ml(&_lock, Mutex::_no_safepoint_check_flag); | |||
| 179 | assert(is_frame_safe(f), "Frame must be safe")do { if (!(is_frame_safe(f))) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/stackWatermark.cpp" , 179, "assert(" "is_frame_safe(f)" ") failed", "Frame must be safe" ); ::breakpoint(); } } while (0); | |||
| 180 | } | |||
| 181 | #endif | |||
| 182 | ||||
| 183 | // A frame is "safe" if it *and* its caller have been processed. This is the invariant | |||
| 184 | // that allows exposing a frame, and for that frame to directly access its caller frame | |||
| 185 | // without going through any hooks. | |||
| 186 | bool StackWatermark::is_frame_safe(const frame& f) { | |||
| 187 | assert(_lock.owned_by_self(), "Must be locked")do { if (!(_lock.owned_by_self())) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/stackWatermark.cpp" , 187, "assert(" "_lock.owned_by_self()" ") failed", "Must be locked" ); ::breakpoint(); } } while (0); | |||
| 188 | uint32_t state = Atomic::load(&_state); | |||
| 189 | if (!processing_started(state)) { | |||
| 190 | return false; | |||
| 191 | } | |||
| 192 | if (processing_completed(state)) { | |||
| 193 | return true; | |||
| 194 | } | |||
| 195 | return reinterpret_cast<uintptr_t>(f.sp()) < _iterator->caller(); | |||
| 196 | } | |||
| 197 | ||||
| 198 | void StackWatermark::start_processing_impl(void* context) { | |||
| 199 | log_info(stackbarrier)(!(LogImpl<(LogTag::_stackbarrier), (LogTag::__NO_TAG), (LogTag ::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag:: __NO_TAG)>::is_level(LogLevel::Info))) ? (void)0 : LogImpl <(LogTag::_stackbarrier), (LogTag::__NO_TAG), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG) >::write<LogLevel::Info>("Starting stack processing for tid %d", | |||
| 200 | _jt->osthread()->thread_id()); | |||
| 201 | delete _iterator; | |||
| 202 | if (_jt->has_last_Java_frame()) { | |||
| 203 | _iterator = new StackWatermarkFramesIterator(*this); | |||
| 204 | // Always process three frames when starting an iteration. | |||
| 205 | // | |||
| 206 | // The three frames corresponds to: | |||
| 207 | // 1) The callee frame | |||
| 208 | // 2) The caller frame | |||
| 209 | // This allows a callee to always be able to read state from its caller | |||
| 210 | // without needing any special barriers. | |||
| 211 | // | |||
| 212 | // 3) An extra frame to deal with unwinding safepointing on the way out. | |||
| 213 | // Sometimes, we also call into the runtime to on_unwind(), but then | |||
| 214 | // hit a safepoint poll on the way out from the runtime. | |||
| 215 | _iterator->process_one(context); | |||
| 216 | _iterator->process_one(context); | |||
| 217 | _iterator->process_one(context); | |||
| 218 | } else { | |||
| 219 | _iterator = NULL__null; | |||
| 220 | } | |||
| 221 | update_watermark(); | |||
| 222 | } | |||
| 223 | ||||
| 224 | void StackWatermark::yield_processing() { | |||
| 225 | update_watermark(); | |||
| 226 | MutexUnlocker mul(&_lock, Mutex::_no_safepoint_check_flag); | |||
| 227 | } | |||
| 228 | ||||
| 229 | void StackWatermark::update_watermark() { | |||
| 230 | assert(_lock.owned_by_self(), "invariant")do { if (!(_lock.owned_by_self())) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/stackWatermark.cpp" , 230, "assert(" "_lock.owned_by_self()" ") failed", "invariant" ); ::breakpoint(); } } while (0); | |||
| 231 | if (_iterator != NULL__null && _iterator->has_next()) { | |||
| 232 | assert(_iterator->callee() != 0, "sanity")do { if (!(_iterator->callee() != 0)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/stackWatermark.cpp" , 232, "assert(" "_iterator->callee() != 0" ") failed", "sanity" ); ::breakpoint(); } } while (0); | |||
| 233 | Atomic::release_store(&_watermark, _iterator->callee()); | |||
| 234 | Atomic::release_store(&_state, StackWatermarkState::create(epoch_id(), false /* is_done */)); // release watermark w.r.t. epoch | |||
| 235 | } else { | |||
| 236 | Atomic::release_store(&_watermark, uintptr_t(0)); // Release stack data modifications w.r.t. watermark | |||
| 237 | Atomic::release_store(&_state, StackWatermarkState::create(epoch_id(), true /* is_done */)); // release watermark w.r.t. epoch | |||
| 238 | log_info(stackbarrier)(!(LogImpl<(LogTag::_stackbarrier), (LogTag::__NO_TAG), (LogTag ::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag:: __NO_TAG)>::is_level(LogLevel::Info))) ? (void)0 : LogImpl <(LogTag::_stackbarrier), (LogTag::__NO_TAG), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG) >::write<LogLevel::Info>("Finished stack processing iteration for tid %d", | |||
| 239 | _jt->osthread()->thread_id()); | |||
| 240 | } | |||
| 241 | } | |||
| 242 | ||||
| 243 | void StackWatermark::process_one() { | |||
| 244 | MutexLocker ml(&_lock, Mutex::_no_safepoint_check_flag); | |||
| 245 | if (!processing_started()) { | |||
| 246 | start_processing_impl(NULL__null /* context */); | |||
| 247 | } else if (!processing_completed()) { | |||
| 248 | _iterator->process_one(NULL__null /* context */); | |||
| 249 | update_watermark(); | |||
| 250 | } | |||
| 251 | } | |||
| 252 | ||||
| 253 | void StackWatermark::link_watermark(StackWatermark* watermark) { | |||
| 254 | assert(watermark == NULL || _linked_watermark == NULL, "nesting not supported")do { if (!(watermark == __null || _linked_watermark == __null )) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/stackWatermark.cpp" , 254, "assert(" "watermark == __null || _linked_watermark == __null" ") failed", "nesting not supported"); ::breakpoint(); } } while (0); | |||
| 255 | _linked_watermark = watermark; | |||
| 256 | } | |||
| 257 | ||||
| 258 | uintptr_t StackWatermark::watermark() { | |||
| 259 | return Atomic::load_acquire(&_watermark); | |||
| 260 | } | |||
| 261 | ||||
| 262 | uintptr_t StackWatermark::last_processed() { | |||
| 263 | MutexLocker ml(&_lock, Mutex::_no_safepoint_check_flag); | |||
| 264 | if (!processing_started()) { | |||
| 265 | // Stale state; no last processed | |||
| 266 | return 0; | |||
| 267 | } | |||
| 268 | if (processing_completed()) { | |||
| 269 | // Already processed all; no last processed | |||
| 270 | return 0; | |||
| 271 | } | |||
| 272 | return _iterator->caller(); | |||
| 273 | } | |||
| 274 | ||||
| 275 | bool StackWatermark::processing_started() const { | |||
| 276 | return processing_started(Atomic::load(&_state)); | |||
| 277 | } | |||
| 278 | ||||
| 279 | bool StackWatermark::processing_started_acquire() const { | |||
| 280 | return processing_started(Atomic::load_acquire(&_state)); | |||
| 281 | } | |||
| 282 | ||||
| 283 | bool StackWatermark::processing_completed() const { | |||
| 284 | return processing_completed(Atomic::load(&_state)); | |||
| 285 | } | |||
| 286 | ||||
| 287 | bool StackWatermark::processing_completed_acquire() const { | |||
| 288 | return processing_completed(Atomic::load_acquire(&_state)); | |||
| 289 | } | |||
| 290 | ||||
| 291 | void StackWatermark::on_safepoint() { | |||
| 292 | start_processing(); | |||
| 293 | StackWatermark* linked_watermark = _linked_watermark; | |||
| 294 | if (linked_watermark != NULL__null) { | |||
| ||||
| 295 | linked_watermark->finish_processing(NULL__null /* context */); | |||
| 296 | } | |||
| 297 | } | |||
| 298 | ||||
| 299 | void StackWatermark::start_processing() { | |||
| 300 | if (!processing_started_acquire()) { | |||
| 301 | MutexLocker ml(&_lock, Mutex::_no_safepoint_check_flag); | |||
| 302 | if (!processing_started()) { | |||
| 303 | start_processing_impl(NULL__null /* context */); | |||
| 304 | } | |||
| 305 | } | |||
| 306 | } | |||
| 307 | ||||
| 308 | void StackWatermark::finish_processing(void* context) { | |||
| 309 | MutexLocker ml(&_lock, Mutex::_no_safepoint_check_flag); | |||
| 310 | if (!processing_started()) { | |||
| 311 | start_processing_impl(context); | |||
| 312 | } | |||
| 313 | if (!processing_completed()) { | |||
| 314 | _iterator->process_all(context); | |||
| ||||
| 315 | update_watermark(); | |||
| 316 | } | |||
| 317 | } |
| 1 | /* |
| 2 | * Copyright (c) 1997, 2021, Oracle and/or its affiliates. All rights reserved. |
| 3 | * Copyright (c) 2021, Azul Systems, Inc. All rights reserved. |
| 4 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 5 | * |
| 6 | * This code is free software; you can redistribute it and/or modify it |
| 7 | * under the terms of the GNU General Public License version 2 only, as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 13 | * version 2 for more details (a copy is included in the LICENSE file that |
| 14 | * accompanied this code). |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License version |
| 17 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 18 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 19 | * |
| 20 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| 21 | * or visit www.oracle.com if you need additional information or have any |
| 22 | * questions. |
| 23 | * |
| 24 | */ |
| 25 | |
| 26 | #ifndef SHARE_RUNTIME_THREAD_HPP |
| 27 | #define SHARE_RUNTIME_THREAD_HPP |
| 28 | |
| 29 | #include "jni.h" |
| 30 | #include "gc/shared/gcThreadLocalData.hpp" |
| 31 | #include "gc/shared/threadLocalAllocBuffer.hpp" |
| 32 | #include "memory/allocation.hpp" |
| 33 | #include "oops/oop.hpp" |
| 34 | #include "oops/oopHandle.hpp" |
| 35 | #include "runtime/frame.hpp" |
| 36 | #include "runtime/globals.hpp" |
| 37 | #include "runtime/handshake.hpp" |
| 38 | #include "runtime/javaFrameAnchor.hpp" |
| 39 | #include "runtime/mutexLocker.hpp" |
| 40 | #include "runtime/os.hpp" |
| 41 | #include "runtime/park.hpp" |
| 42 | #include "runtime/safepointMechanism.hpp" |
| 43 | #include "runtime/stackWatermarkSet.hpp" |
| 44 | #include "runtime/stackOverflow.hpp" |
| 45 | #include "runtime/threadHeapSampler.hpp" |
| 46 | #include "runtime/threadLocalStorage.hpp" |
| 47 | #include "runtime/threadStatisticalInfo.hpp" |
| 48 | #include "runtime/unhandledOops.hpp" |
| 49 | #include "utilities/align.hpp" |
| 50 | #include "utilities/exceptions.hpp" |
| 51 | #include "utilities/globalDefinitions.hpp" |
| 52 | #include "utilities/macros.hpp" |
| 53 | #if INCLUDE_JFR1 |
| 54 | #include "jfr/support/jfrThreadExtension.hpp" |
| 55 | #endif |
| 56 | |
| 57 | class SafeThreadsListPtr; |
| 58 | class ThreadSafepointState; |
| 59 | class ThreadsList; |
| 60 | class ThreadsSMRSupport; |
| 61 | |
| 62 | class JNIHandleBlock; |
| 63 | class JvmtiRawMonitor; |
| 64 | class JvmtiSampledObjectAllocEventCollector; |
| 65 | class JvmtiThreadState; |
| 66 | class JvmtiVMObjectAllocEventCollector; |
| 67 | class OSThread; |
| 68 | class ThreadStatistics; |
| 69 | class ConcurrentLocksDump; |
| 70 | class MonitorInfo; |
| 71 | |
| 72 | class vframeArray; |
| 73 | class vframe; |
| 74 | class javaVFrame; |
| 75 | |
| 76 | class DeoptResourceMark; |
| 77 | class JvmtiDeferredUpdates; |
| 78 | |
| 79 | class ThreadClosure; |
| 80 | class ICRefillVerifier; |
| 81 | |
| 82 | class Metadata; |
| 83 | class ResourceArea; |
| 84 | |
| 85 | class OopStorage; |
| 86 | |
| 87 | DEBUG_ONLY(class ResourceMark;)class ResourceMark; |
| 88 | |
| 89 | class WorkerThread; |
| 90 | |
| 91 | class JavaThread; |
| 92 | |
| 93 | // Class hierarchy |
| 94 | // - Thread |
| 95 | // - JavaThread |
| 96 | // - various subclasses eg CompilerThread, ServiceThread |
| 97 | // - NonJavaThread |
| 98 | // - NamedThread |
| 99 | // - VMThread |
| 100 | // - ConcurrentGCThread |
| 101 | // - WorkerThread |
| 102 | // - WatcherThread |
| 103 | // - JfrThreadSampler |
| 104 | // - LogAsyncWriter |
| 105 | // |
| 106 | // All Thread subclasses must be either JavaThread or NonJavaThread. |
| 107 | // This means !t->is_Java_thread() iff t is a NonJavaThread, or t is |
| 108 | // a partially constructed/destroyed Thread. |
| 109 | |
| 110 | // Thread execution sequence and actions: |
| 111 | // All threads: |
| 112 | // - thread_native_entry // per-OS native entry point |
| 113 | // - stack initialization |
| 114 | // - other OS-level initialization (signal masks etc) |
| 115 | // - handshake with creating thread (if not started suspended) |
| 116 | // - this->call_run() // common shared entry point |
| 117 | // - shared common initialization |
| 118 | // - this->pre_run() // virtual per-thread-type initialization |
| 119 | // - this->run() // virtual per-thread-type "main" logic |
| 120 | // - shared common tear-down |
| 121 | // - this->post_run() // virtual per-thread-type tear-down |
| 122 | // - // 'this' no longer referenceable |
| 123 | // - OS-level tear-down (minimal) |
| 124 | // - final logging |
| 125 | // |
| 126 | // For JavaThread: |
| 127 | // - this->run() // virtual but not normally overridden |
| 128 | // - this->thread_main_inner() // extra call level to ensure correct stack calculations |
| 129 | // - this->entry_point() // set differently for each kind of JavaThread |
| 130 | |
| 131 | class Thread: public ThreadShadow { |
| 132 | friend class VMStructs; |
| 133 | friend class JVMCIVMStructs; |
| 134 | private: |
| 135 | |
| 136 | #ifndef USE_LIBRARY_BASED_TLS_ONLY |
| 137 | // Current thread is maintained as a thread-local variable |
| 138 | static THREAD_LOCAL__thread Thread* _thr_current; |
| 139 | #endif |
| 140 | |
| 141 | // Thread local data area available to the GC. The internal |
| 142 | // structure and contents of this data area is GC-specific. |
| 143 | // Only GC and GC barrier code should access this data area. |
| 144 | GCThreadLocalData _gc_data; |
| 145 | |
| 146 | public: |
| 147 | static ByteSize gc_data_offset() { |
| 148 | return byte_offset_of(Thread, _gc_data)in_ByteSize((int)(size_t)((intx)&(((Thread*)16)->_gc_data ) - 16)); |
| 149 | } |
| 150 | |
| 151 | template <typename T> T* gc_data() { |
| 152 | STATIC_ASSERT(sizeof(T) <= sizeof(_gc_data))static_assert((sizeof(T) <= sizeof(_gc_data)), "sizeof(T) <= sizeof(_gc_data)" ); |
| 153 | return reinterpret_cast<T*>(&_gc_data); |
| 154 | } |
| 155 | |
| 156 | // Exception handling |
| 157 | // (Note: _pending_exception and friends are in ThreadShadow) |
| 158 | //oop _pending_exception; // pending exception for current thread |
| 159 | // const char* _exception_file; // file information for exception (debugging only) |
| 160 | // int _exception_line; // line information for exception (debugging only) |
| 161 | protected: |
| 162 | |
| 163 | DEBUG_ONLY(static Thread* _starting_thread;)static Thread* _starting_thread; |
| 164 | |
| 165 | // JavaThread lifecycle support: |
| 166 | friend class SafeThreadsListPtr; // for _threads_list_ptr, cmpxchg_threads_hazard_ptr(), {dec_,inc_,}nested_threads_hazard_ptr_cnt(), {g,s}et_threads_hazard_ptr(), inc_nested_handle_cnt(), tag_hazard_ptr() access |
| 167 | friend class ScanHazardPtrGatherProtectedThreadsClosure; // for cmpxchg_threads_hazard_ptr(), get_threads_hazard_ptr(), is_hazard_ptr_tagged() access |
| 168 | friend class ScanHazardPtrGatherThreadsListClosure; // for get_threads_hazard_ptr(), untag_hazard_ptr() access |
| 169 | friend class ScanHazardPtrPrintMatchingThreadsClosure; // for get_threads_hazard_ptr(), is_hazard_ptr_tagged() access |
| 170 | friend class ThreadsSMRSupport; // for _nested_threads_hazard_ptr_cnt, _threads_hazard_ptr, _threads_list_ptr access |
| 171 | friend class ThreadsListHandleTest; // for _nested_threads_hazard_ptr_cnt, _threads_hazard_ptr, _threads_list_ptr access |
| 172 | friend class ValidateHazardPtrsClosure; // for get_threads_hazard_ptr(), untag_hazard_ptr() access |
| 173 | |
| 174 | ThreadsList* volatile _threads_hazard_ptr; |
| 175 | SafeThreadsListPtr* _threads_list_ptr; |
| 176 | ThreadsList* cmpxchg_threads_hazard_ptr(ThreadsList* exchange_value, ThreadsList* compare_value); |
| 177 | ThreadsList* get_threads_hazard_ptr() const; |
| 178 | void set_threads_hazard_ptr(ThreadsList* new_list); |
| 179 | static bool is_hazard_ptr_tagged(ThreadsList* list) { |
| 180 | return (intptr_t(list) & intptr_t(1)) == intptr_t(1); |
| 181 | } |
| 182 | static ThreadsList* tag_hazard_ptr(ThreadsList* list) { |
| 183 | return (ThreadsList*)(intptr_t(list) | intptr_t(1)); |
| 184 | } |
| 185 | static ThreadsList* untag_hazard_ptr(ThreadsList* list) { |
| 186 | return (ThreadsList*)(intptr_t(list) & ~intptr_t(1)); |
| 187 | } |
| 188 | // This field is enabled via -XX:+EnableThreadSMRStatistics: |
| 189 | uint _nested_threads_hazard_ptr_cnt; |
| 190 | void dec_nested_threads_hazard_ptr_cnt() { |
| 191 | assert(_nested_threads_hazard_ptr_cnt != 0, "mismatched {dec,inc}_nested_threads_hazard_ptr_cnt()")do { if (!(_nested_threads_hazard_ptr_cnt != 0)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/thread.hpp" , 191, "assert(" "_nested_threads_hazard_ptr_cnt != 0" ") failed" , "mismatched {dec,inc}_nested_threads_hazard_ptr_cnt()"); :: breakpoint(); } } while (0); |
| 192 | _nested_threads_hazard_ptr_cnt--; |
| 193 | } |
| 194 | void inc_nested_threads_hazard_ptr_cnt() { |
| 195 | _nested_threads_hazard_ptr_cnt++; |
| 196 | } |
| 197 | uint nested_threads_hazard_ptr_cnt() { |
| 198 | return _nested_threads_hazard_ptr_cnt; |
| 199 | } |
| 200 | |
| 201 | public: |
| 202 | // Is the target JavaThread protected by the calling Thread or by some other |
| 203 | // mechanism? |
| 204 | static bool is_JavaThread_protected(const JavaThread* target); |
| 205 | // Is the target JavaThread protected by a ThreadsListHandle (TLH) associated |
| 206 | // with the calling Thread? |
| 207 | static bool is_JavaThread_protected_by_TLH(const JavaThread* target); |
| 208 | |
| 209 | void* operator new(size_t size) throw() { return allocate(size, true); } |
| 210 | void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() { |
| 211 | return allocate(size, false); } |
| 212 | void operator delete(void* p); |
| 213 | |
| 214 | protected: |
| 215 | static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread); |
| 216 | |
| 217 | private: |
| 218 | DEBUG_ONLY(bool _suspendible_thread;)bool _suspendible_thread; |
| 219 | |
| 220 | public: |
| 221 | // Determines if a heap allocation failure will be retried |
| 222 | // (e.g., by deoptimizing and re-executing in the interpreter). |
| 223 | // In this case, the failed allocation must raise |
| 224 | // Universe::out_of_memory_error_retry() and omit side effects |
| 225 | // such as JVMTI events and handling -XX:+HeapDumpOnOutOfMemoryError |
| 226 | // and -XX:OnOutOfMemoryError. |
| 227 | virtual bool in_retryable_allocation() const { return false; } |
| 228 | |
| 229 | #ifdef ASSERT1 |
| 230 | void set_suspendible_thread() { |
| 231 | _suspendible_thread = true; |
| 232 | } |
| 233 | |
| 234 | void clear_suspendible_thread() { |
| 235 | _suspendible_thread = false; |
| 236 | } |
| 237 | |
| 238 | bool is_suspendible_thread() { return _suspendible_thread; } |
| 239 | #endif |
| 240 | |
| 241 | private: |
| 242 | // Point to the last handle mark |
| 243 | HandleMark* _last_handle_mark; |
| 244 | |
| 245 | // Claim value for parallel iteration over threads. |
| 246 | uintx _threads_do_token; |
| 247 | |
| 248 | // Support for GlobalCounter |
| 249 | private: |
| 250 | volatile uintx _rcu_counter; |
| 251 | public: |
| 252 | volatile uintx* get_rcu_counter() { |
| 253 | return &_rcu_counter; |
| 254 | } |
| 255 | |
| 256 | public: |
| 257 | void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } |
| 258 | HandleMark* last_handle_mark() const { return _last_handle_mark; } |
| 259 | private: |
| 260 | |
| 261 | #ifdef ASSERT1 |
| 262 | ICRefillVerifier* _missed_ic_stub_refill_verifier; |
| 263 | |
| 264 | public: |
| 265 | ICRefillVerifier* missed_ic_stub_refill_verifier() { |
| 266 | return _missed_ic_stub_refill_verifier; |
| 267 | } |
| 268 | |
| 269 | void set_missed_ic_stub_refill_verifier(ICRefillVerifier* verifier) { |
| 270 | _missed_ic_stub_refill_verifier = verifier; |
| 271 | } |
| 272 | #endif // ASSERT |
| 273 | |
| 274 | private: |
| 275 | // Used by SkipGCALot class. |
| 276 | NOT_PRODUCT(bool _skip_gcalot;)bool _skip_gcalot; // Should we elide gc-a-lot? |
| 277 | |
| 278 | friend class GCLocker; |
| 279 | |
| 280 | private: |
| 281 | ThreadLocalAllocBuffer _tlab; // Thread-local eden |
| 282 | jlong _allocated_bytes; // Cumulative number of bytes allocated on |
| 283 | // the Java heap |
| 284 | ThreadHeapSampler _heap_sampler; // For use when sampling the memory. |
| 285 | |
| 286 | ThreadStatisticalInfo _statistical_info; // Statistics about the thread |
| 287 | |
| 288 | JFR_ONLY(DEFINE_THREAD_LOCAL_FIELD_JFR;)mutable JfrThreadLocal _jfr_thread_local; // Thread-local data for jfr |
| 289 | |
| 290 | JvmtiRawMonitor* _current_pending_raw_monitor; // JvmtiRawMonitor this thread |
| 291 | // is waiting to lock |
| 292 | public: |
| 293 | // Constructor |
| 294 | Thread(); |
| 295 | virtual ~Thread() = 0; // Thread is abstract. |
| 296 | |
| 297 | // Manage Thread::current() |
| 298 | void initialize_thread_current(); |
| 299 | static void clear_thread_current(); // TLS cleanup needed before threads terminate |
| 300 | |
| 301 | protected: |
| 302 | // To be implemented by children. |
| 303 | virtual void run() = 0; |
| 304 | virtual void pre_run() = 0; |
| 305 | virtual void post_run() = 0; // Note: Thread must not be deleted prior to calling this! |
| 306 | |
| 307 | #ifdef ASSERT1 |
| 308 | enum RunState { |
| 309 | PRE_CALL_RUN, |
| 310 | CALL_RUN, |
| 311 | PRE_RUN, |
| 312 | RUN, |
| 313 | POST_RUN |
| 314 | // POST_CALL_RUN - can't define this one as 'this' may be deleted when we want to set it |
| 315 | }; |
| 316 | RunState _run_state; // for lifecycle checks |
| 317 | #endif |
| 318 | |
| 319 | |
| 320 | public: |
| 321 | // invokes <ChildThreadClass>::run(), with common preparations and cleanups. |
| 322 | void call_run(); |
| 323 | |
| 324 | // Testers |
| 325 | virtual bool is_VM_thread() const { return false; } |
| 326 | virtual bool is_Java_thread() const { return false; } |
| 327 | virtual bool is_Compiler_thread() const { return false; } |
| 328 | virtual bool is_Code_cache_sweeper_thread() const { return false; } |
| 329 | virtual bool is_service_thread() const { return false; } |
| 330 | virtual bool is_monitor_deflation_thread() const { return false; } |
| 331 | virtual bool is_hidden_from_external_view() const { return false; } |
| 332 | virtual bool is_jvmti_agent_thread() const { return false; } |
| 333 | virtual bool is_Watcher_thread() const { return false; } |
| 334 | virtual bool is_ConcurrentGC_thread() const { return false; } |
| 335 | virtual bool is_Named_thread() const { return false; } |
| 336 | virtual bool is_Worker_thread() const { return false; } |
| 337 | virtual bool is_JfrSampler_thread() const { return false; } |
| 338 | |
| 339 | // Can this thread make Java upcalls |
| 340 | virtual bool can_call_java() const { return false; } |
| 341 | |
| 342 | // Is this a JavaThread that is on the VM's current ThreadsList? |
| 343 | // If so it must participate in the safepoint protocol. |
| 344 | virtual bool is_active_Java_thread() const { return false; } |
| 345 | |
| 346 | // All threads are given names. For singleton subclasses we can |
| 347 | // just hard-wire the known name of the instance. JavaThreads and |
| 348 | // NamedThreads support multiple named instances, and dynamic |
| 349 | // changing of the name of an instance. |
| 350 | virtual const char* name() const { return "Unknown thread"; } |
| 351 | |
| 352 | // A thread's type name is also made available for debugging |
| 353 | // and logging. |
| 354 | virtual const char* type_name() const { return "Thread"; } |
| 355 | |
| 356 | // Returns the current thread (ASSERTS if NULL) |
| 357 | static inline Thread* current(); |
| 358 | // Returns the current thread, or NULL if not attached |
| 359 | static inline Thread* current_or_null(); |
| 360 | // Returns the current thread, or NULL if not attached, and is |
| 361 | // safe for use from signal-handlers |
| 362 | static inline Thread* current_or_null_safe(); |
| 363 | |
| 364 | // Common thread operations |
| 365 | #ifdef ASSERT1 |
| 366 | static void check_for_dangling_thread_pointer(Thread *thread); |
| 367 | #endif |
| 368 | static void set_priority(Thread* thread, ThreadPriority priority); |
| 369 | static ThreadPriority get_priority(const Thread* const thread); |
| 370 | static void start(Thread* thread); |
| 371 | |
| 372 | void set_native_thread_name(const char *name) { |
| 373 | assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread")do { if (!(Thread::current() == this)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/thread.hpp" , 373, "assert(" "Thread::current() == this" ") failed", "set_native_thread_name can only be called on the current thread" ); ::breakpoint(); } } while (0); |
| 374 | os::set_native_thread_name(name); |
| 375 | } |
| 376 | |
| 377 | // Support for Unhandled Oop detection |
| 378 | // Add the field for both, fastdebug and debug, builds to keep |
| 379 | // Thread's fields layout the same. |
| 380 | // Note: CHECK_UNHANDLED_OOPS is defined only for fastdebug build. |
| 381 | #ifdef CHECK_UNHANDLED_OOPS1 |
| 382 | private: |
| 383 | UnhandledOops* _unhandled_oops; |
| 384 | #elif defined(ASSERT1) |
| 385 | private: |
| 386 | void* _unhandled_oops; |
| 387 | #endif |
| 388 | #ifdef CHECK_UNHANDLED_OOPS1 |
| 389 | public: |
| 390 | UnhandledOops* unhandled_oops() { return _unhandled_oops; } |
| 391 | // Mark oop safe for gc. It may be stack allocated but won't move. |
| 392 | void allow_unhandled_oop(oop *op) { |
| 393 | if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); |
| 394 | } |
| 395 | // Clear oops at safepoint so crashes point to unhandled oop violator |
| 396 | void clear_unhandled_oops() { |
| 397 | if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); |
| 398 | } |
| 399 | #endif // CHECK_UNHANDLED_OOPS |
| 400 | |
| 401 | public: |
| 402 | #ifndef PRODUCT |
| 403 | bool skip_gcalot() { return _skip_gcalot; } |
| 404 | void set_skip_gcalot(bool v) { _skip_gcalot = v; } |
| 405 | #endif |
| 406 | |
| 407 | // Resource area |
| 408 | ResourceArea* resource_area() const { return _resource_area; } |
| 409 | void set_resource_area(ResourceArea* area) { _resource_area = area; } |
| 410 | |
| 411 | OSThread* osthread() const { return _osthread; } |
| 412 | void set_osthread(OSThread* thread) { _osthread = thread; } |
| 413 | |
| 414 | // Internal handle support |
| 415 | HandleArea* handle_area() const { return _handle_area; } |
| 416 | void set_handle_area(HandleArea* area) { _handle_area = area; } |
| 417 | |
| 418 | GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; } |
| 419 | void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; } |
| 420 | |
| 421 | // Thread-Local Allocation Buffer (TLAB) support |
| 422 | ThreadLocalAllocBuffer& tlab() { return _tlab; } |
| 423 | void initialize_tlab(); |
| 424 | |
| 425 | jlong allocated_bytes() { return _allocated_bytes; } |
| 426 | void set_allocated_bytes(jlong value) { _allocated_bytes = value; } |
| 427 | void incr_allocated_bytes(jlong size) { _allocated_bytes += size; } |
| 428 | inline jlong cooked_allocated_bytes(); |
| 429 | |
| 430 | ThreadHeapSampler& heap_sampler() { return _heap_sampler; } |
| 431 | |
| 432 | ThreadStatisticalInfo& statistical_info() { return _statistical_info; } |
| 433 | |
| 434 | JFR_ONLY(DEFINE_THREAD_LOCAL_ACCESSOR_JFR;)JfrThreadLocal* jfr_thread_local() const { return &_jfr_thread_local ; }; |
| 435 | |
| 436 | // For tracking the Jvmti raw monitor the thread is pending on. |
| 437 | JvmtiRawMonitor* current_pending_raw_monitor() { |
| 438 | return _current_pending_raw_monitor; |
| 439 | } |
| 440 | void set_current_pending_raw_monitor(JvmtiRawMonitor* monitor) { |
| 441 | _current_pending_raw_monitor = monitor; |
| 442 | } |
| 443 | |
| 444 | // GC support |
| 445 | // Apply "f->do_oop" to all root oops in "this". |
| 446 | // Used by JavaThread::oops_do. |
| 447 | // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames |
| 448 | virtual void oops_do_no_frames(OopClosure* f, CodeBlobClosure* cf); |
| 449 | virtual void oops_do_frames(OopClosure* f, CodeBlobClosure* cf) {} |
| 450 | void oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 451 | |
| 452 | // Handles the parallel case for claim_threads_do. |
| 453 | private: |
| 454 | bool claim_par_threads_do(uintx claim_token); |
| 455 | public: |
| 456 | // Requires that "claim_token" is that of the current iteration. |
| 457 | // If "is_par" is false, sets the token of "this" to |
| 458 | // "claim_token", and returns "true". If "is_par" is true, |
| 459 | // uses an atomic instruction to set the current thread's token to |
| 460 | // "claim_token", if it is not already. Returns "true" iff the |
| 461 | // calling thread does the update, this indicates that the calling thread |
| 462 | // has claimed the thread in the current iteration. |
| 463 | bool claim_threads_do(bool is_par, uintx claim_token) { |
| 464 | if (!is_par) { |
| 465 | _threads_do_token = claim_token; |
| 466 | return true; |
| 467 | } else { |
| 468 | return claim_par_threads_do(claim_token); |
| 469 | } |
| 470 | } |
| 471 | |
| 472 | uintx threads_do_token() const { return _threads_do_token; } |
| 473 | |
| 474 | // jvmtiRedefineClasses support |
| 475 | void metadata_handles_do(void f(Metadata*)); |
| 476 | |
| 477 | private: |
| 478 | // Check if address is within the given range of this thread's |
| 479 | // stack: stack_base() > adr >/>= limit |
| 480 | // The check is inclusive of limit if passed true, else exclusive. |
| 481 | bool is_in_stack_range(address adr, address limit, bool inclusive) const { |
| 482 | assert(stack_base() > limit && limit >= stack_end(), "limit is outside of stack")do { if (!(stack_base() > limit && limit >= stack_end ())) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/thread.hpp" , 482, "assert(" "stack_base() > limit && limit >= stack_end()" ") failed", "limit is outside of stack"); ::breakpoint(); } } while (0); |
| 483 | return stack_base() > adr && (inclusive ? adr >= limit : adr > limit); |
| 484 | } |
| 485 | |
| 486 | public: |
| 487 | // Used by fast lock support |
| 488 | virtual bool is_lock_owned(address adr) const; |
| 489 | |
| 490 | // Check if address is within the given range of this thread's |
| 491 | // stack: stack_base() > adr >= limit |
| 492 | bool is_in_stack_range_incl(address adr, address limit) const { |
| 493 | return is_in_stack_range(adr, limit, true); |
| 494 | } |
| 495 | |
| 496 | // Check if address is within the given range of this thread's |
| 497 | // stack: stack_base() > adr > limit |
| 498 | bool is_in_stack_range_excl(address adr, address limit) const { |
| 499 | return is_in_stack_range(adr, limit, false); |
| 500 | } |
| 501 | |
| 502 | // Check if address is in the stack mapped to this thread. Used mainly in |
| 503 | // error reporting (so has to include guard zone) and frame printing. |
| 504 | // Expects _stack_base to be initialized - checked with assert. |
| 505 | bool is_in_full_stack_checked(address adr) const { |
| 506 | return is_in_stack_range_incl(adr, stack_end()); |
| 507 | } |
| 508 | |
| 509 | // Like is_in_full_stack_checked but without the assertions as this |
| 510 | // may be called in a thread before _stack_base is initialized. |
| 511 | bool is_in_full_stack(address adr) const { |
| 512 | address stack_end = _stack_base - _stack_size; |
| 513 | return _stack_base > adr && adr >= stack_end; |
| 514 | } |
| 515 | |
| 516 | // Check if address is in the live stack of this thread (not just for locks). |
| 517 | // Warning: can only be called by the current thread on itself. |
| 518 | bool is_in_live_stack(address adr) const { |
| 519 | assert(Thread::current() == this, "is_in_live_stack can only be called from current thread")do { if (!(Thread::current() == this)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/thread.hpp" , 519, "assert(" "Thread::current() == this" ") failed", "is_in_live_stack can only be called from current thread" ); ::breakpoint(); } } while (0); |
| 520 | return is_in_stack_range_incl(adr, os::current_stack_pointer()); |
| 521 | } |
| 522 | |
| 523 | // Sets this thread as starting thread. Returns failure if thread |
| 524 | // creation fails due to lack of memory, too many threads etc. |
| 525 | bool set_as_starting_thread(); |
| 526 | |
| 527 | protected: |
| 528 | // OS data associated with the thread |
| 529 | OSThread* _osthread; // Platform-specific thread information |
| 530 | |
| 531 | // Thread local resource area for temporary allocation within the VM |
| 532 | ResourceArea* _resource_area; |
| 533 | |
| 534 | DEBUG_ONLY(ResourceMark* _current_resource_mark;)ResourceMark* _current_resource_mark; |
| 535 | |
| 536 | // Thread local handle area for allocation of handles within the VM |
| 537 | HandleArea* _handle_area; |
| 538 | GrowableArray<Metadata*>* _metadata_handles; |
| 539 | |
| 540 | // Support for stack overflow handling, get_thread, etc. |
| 541 | address _stack_base; |
| 542 | size_t _stack_size; |
| 543 | int _lgrp_id; |
| 544 | |
| 545 | public: |
| 546 | // Stack overflow support |
| 547 | address stack_base() const { assert(_stack_base != NULL,"Sanity check")do { if (!(_stack_base != __null)) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/thread.hpp" , 547, "assert(" "_stack_base != __null" ") failed", "Sanity check" ); ::breakpoint(); } } while (0); return _stack_base; } |
| 548 | void set_stack_base(address base) { _stack_base = base; } |
| 549 | size_t stack_size() const { return _stack_size; } |
| 550 | void set_stack_size(size_t size) { _stack_size = size; } |
| 551 | address stack_end() const { return stack_base() - stack_size(); } |
| 552 | void record_stack_base_and_size(); |
| 553 | void register_thread_stack_with_NMT() NOT_NMT_RETURN; |
| 554 | void unregister_thread_stack_with_NMT() NOT_NMT_RETURN; |
| 555 | |
| 556 | int lgrp_id() const { return _lgrp_id; } |
| 557 | void set_lgrp_id(int value) { _lgrp_id = value; } |
| 558 | |
| 559 | // Printing |
| 560 | void print_on(outputStream* st, bool print_extended_info) const; |
| 561 | virtual void print_on(outputStream* st) const { print_on(st, false); } |
| 562 | void print() const; |
| 563 | virtual void print_on_error(outputStream* st, char* buf, int buflen) const; |
| 564 | // Basic, non-virtual, printing support that is simple and always safe. |
| 565 | void print_value_on(outputStream* st) const; |
| 566 | |
| 567 | // Debug-only code |
| 568 | #ifdef ASSERT1 |
| 569 | private: |
| 570 | // Deadlock detection support for Mutex locks. List of locks own by thread. |
| 571 | Mutex* _owned_locks; |
| 572 | // Mutex::set_owner_implementation is the only place where _owned_locks is modified, |
| 573 | // thus the friendship |
| 574 | friend class Mutex; |
| 575 | friend class Monitor; |
| 576 | |
| 577 | public: |
| 578 | void print_owned_locks_on(outputStream* st) const; |
| 579 | void print_owned_locks() const { print_owned_locks_on(tty); } |
| 580 | Mutex* owned_locks() const { return _owned_locks; } |
| 581 | bool owns_locks() const { return owned_locks() != NULL__null; } |
| 582 | |
| 583 | // Deadlock detection |
| 584 | ResourceMark* current_resource_mark() { return _current_resource_mark; } |
| 585 | void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; } |
| 586 | #endif // ASSERT |
| 587 | |
| 588 | private: |
| 589 | volatile int _jvmti_env_iteration_count; |
| 590 | |
| 591 | public: |
| 592 | void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } |
| 593 | void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } |
| 594 | bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } |
| 595 | |
| 596 | // Code generation |
| 597 | static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file)in_ByteSize((int)(size_t)((intx)&(((Thread*)16)->_exception_file ) - 16)); } |
| 598 | static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line)in_ByteSize((int)(size_t)((intx)&(((Thread*)16)->_exception_line ) - 16)); } |
| 599 | |
| 600 | static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base)in_ByteSize((int)(size_t)((intx)&(((Thread*)16)->_stack_base ) - 16)); } |
| 601 | static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size)in_ByteSize((int)(size_t)((intx)&(((Thread*)16)->_stack_size ) - 16)); } |
| 602 | |
| 603 | static ByteSize tlab_start_offset() { return byte_offset_of(Thread, _tlab)in_ByteSize((int)(size_t)((intx)&(((Thread*)16)->_tlab ) - 16)) + ThreadLocalAllocBuffer::start_offset(); } |
| 604 | static ByteSize tlab_end_offset() { return byte_offset_of(Thread, _tlab)in_ByteSize((int)(size_t)((intx)&(((Thread*)16)->_tlab ) - 16)) + ThreadLocalAllocBuffer::end_offset(); } |
| 605 | static ByteSize tlab_top_offset() { return byte_offset_of(Thread, _tlab)in_ByteSize((int)(size_t)((intx)&(((Thread*)16)->_tlab ) - 16)) + ThreadLocalAllocBuffer::top_offset(); } |
| 606 | static ByteSize tlab_pf_top_offset() { return byte_offset_of(Thread, _tlab)in_ByteSize((int)(size_t)((intx)&(((Thread*)16)->_tlab ) - 16)) + ThreadLocalAllocBuffer::pf_top_offset(); } |
| 607 | |
| 608 | static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes)in_ByteSize((int)(size_t)((intx)&(((Thread*)16)->_allocated_bytes ) - 16)); } |
| 609 | |
| 610 | JFR_ONLY(DEFINE_THREAD_LOCAL_OFFSET_JFR;)static ByteSize jfr_thread_local_offset() { return in_ByteSize ((size_t)((intx)&(((Thread*)16)->_jfr_thread_local) - 16 )); }; |
| 611 | |
| 612 | public: |
| 613 | ParkEvent * volatile _ParkEvent; // for Object monitors, JVMTI raw monitors, |
| 614 | // and ObjectSynchronizer::read_stable_mark |
| 615 | |
| 616 | // Termination indicator used by the signal handler. |
| 617 | // _ParkEvent is just a convenient field we can NULL out after setting the JavaThread termination state |
| 618 | // (which can't itself be read from the signal handler if a signal hits during the Thread destructor). |
| 619 | bool has_terminated() { return Atomic::load(&_ParkEvent) == NULL__null; }; |
| 620 | |
| 621 | jint _hashStateW; // Marsaglia Shift-XOR thread-local RNG |
| 622 | jint _hashStateX; // thread-specific hashCode generator state |
| 623 | jint _hashStateY; |
| 624 | jint _hashStateZ; |
| 625 | |
| 626 | // Low-level leaf-lock primitives used to implement synchronization. |
| 627 | // Not for general synchronization use. |
| 628 | static void SpinAcquire(volatile int * Lock, const char * Name); |
| 629 | static void SpinRelease(volatile int * Lock); |
| 630 | |
| 631 | #if defined(__APPLE__) && defined(AARCH64) |
| 632 | private: |
| 633 | DEBUG_ONLY(bool _wx_init)bool _wx_init; |
| 634 | WXMode _wx_state; |
| 635 | public: |
| 636 | void init_wx(); |
| 637 | WXMode enable_wx(WXMode new_state); |
| 638 | |
| 639 | void assert_wx_state(WXMode expected) { |
| 640 | assert(_wx_state == expected, "wrong state")do { if (!(_wx_state == expected)) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/thread.hpp" , 640, "assert(" "_wx_state == expected" ") failed", "wrong state" ); ::breakpoint(); } } while (0); |
| 641 | } |
| 642 | #endif // __APPLE__ && AARCH64 |
| 643 | }; |
| 644 | |
| 645 | // Inline implementation of Thread::current() |
| 646 | inline Thread* Thread::current() { |
| 647 | Thread* current = current_or_null(); |
| 648 | assert(current != NULL, "Thread::current() called on detached thread")do { if (!(current != __null)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/thread.hpp" , 648, "assert(" "current != __null" ") failed", "Thread::current() called on detached thread" ); ::breakpoint(); } } while (0); |
| 649 | return current; |
| 650 | } |
| 651 | |
| 652 | inline Thread* Thread::current_or_null() { |
| 653 | #ifndef USE_LIBRARY_BASED_TLS_ONLY |
| 654 | return _thr_current; |
| 655 | #else |
| 656 | if (ThreadLocalStorage::is_initialized()) { |
| 657 | return ThreadLocalStorage::thread(); |
| 658 | } |
| 659 | return NULL__null; |
| 660 | #endif |
| 661 | } |
| 662 | |
| 663 | inline Thread* Thread::current_or_null_safe() { |
| 664 | if (ThreadLocalStorage::is_initialized()) { |
| 665 | return ThreadLocalStorage::thread(); |
| 666 | } |
| 667 | return NULL__null; |
| 668 | } |
| 669 | |
| 670 | class CompilerThread; |
| 671 | |
| 672 | typedef void (*ThreadFunction)(JavaThread*, TRAPSJavaThread* __the_thread__); |
| 673 | |
| 674 | class JavaThread: public Thread { |
| 675 | friend class VMStructs; |
| 676 | friend class JVMCIVMStructs; |
| 677 | friend class WhiteBox; |
| 678 | friend class ThreadsSMRSupport; // to access _threadObj for exiting_threads_oops_do |
| 679 | friend class HandshakeState; |
| 680 | private: |
| 681 | bool _on_thread_list; // Is set when this JavaThread is added to the Threads list |
| 682 | OopHandle _threadObj; // The Java level thread object |
| 683 | |
| 684 | #ifdef ASSERT1 |
| 685 | private: |
| 686 | int _java_call_counter; |
| 687 | |
| 688 | public: |
| 689 | int java_call_counter() { return _java_call_counter; } |
| 690 | void inc_java_call_counter() { _java_call_counter++; } |
| 691 | void dec_java_call_counter() { |
| 692 | assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper")do { if (!(_java_call_counter > 0)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/thread.hpp" , 692, "assert(" "_java_call_counter > 0" ") failed", "Invalid nesting of JavaCallWrapper" ); ::breakpoint(); } } while (0); |
| 693 | _java_call_counter--; |
| 694 | } |
| 695 | private: // restore original namespace restriction |
| 696 | #endif // ifdef ASSERT |
| 697 | |
| 698 | JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state |
| 699 | |
| 700 | ThreadFunction _entry_point; |
| 701 | |
| 702 | JNIEnv _jni_environment; |
| 703 | |
| 704 | // Deopt support |
| 705 | DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization |
| 706 | |
| 707 | CompiledMethod* _deopt_nmethod; // CompiledMethod that is currently being deoptimized |
| 708 | vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays |
| 709 | vframeArray* _vframe_array_last; // Holds last vFrameArray we popped |
| 710 | // Holds updates by JVMTI agents for compiled frames that cannot be performed immediately. They |
| 711 | // will be carried out as soon as possible which, in most cases, is just before deoptimization of |
| 712 | // the frame, when control returns to it. |
| 713 | JvmtiDeferredUpdates* _jvmti_deferred_updates; |
| 714 | |
| 715 | // Handshake value for fixing 6243940. We need a place for the i2c |
| 716 | // adapter to store the callee Method*. This value is NEVER live |
| 717 | // across a gc point so it does NOT have to be gc'd |
| 718 | // The handshake is open ended since we can't be certain that it will |
| 719 | // be NULLed. This is because we rarely ever see the race and end up |
| 720 | // in handle_wrong_method which is the backend of the handshake. See |
| 721 | // code in i2c adapters and handle_wrong_method. |
| 722 | |
| 723 | Method* _callee_target; |
| 724 | |
| 725 | // Used to pass back results to the interpreter or generated code running Java code. |
| 726 | oop _vm_result; // oop result is GC-preserved |
| 727 | Metadata* _vm_result_2; // non-oop result |
| 728 | |
| 729 | // See ReduceInitialCardMarks: this holds the precise space interval of |
| 730 | // the most recent slow path allocation for which compiled code has |
| 731 | // elided card-marks for performance along the fast-path. |
| 732 | MemRegion _deferred_card_mark; |
| 733 | |
| 734 | ObjectMonitor* volatile _current_pending_monitor; // ObjectMonitor this thread is waiting to lock |
| 735 | bool _current_pending_monitor_is_from_java; // locking is from Java code |
| 736 | ObjectMonitor* volatile _current_waiting_monitor; // ObjectMonitor on which this thread called Object.wait() |
| 737 | |
| 738 | // Active_handles points to a block of handles |
| 739 | JNIHandleBlock* _active_handles; |
| 740 | |
| 741 | // One-element thread local free list |
| 742 | JNIHandleBlock* _free_handle_block; |
| 743 | |
| 744 | public: |
| 745 | volatile intptr_t _Stalled; |
| 746 | |
| 747 | // For tracking the heavyweight monitor the thread is pending on. |
| 748 | ObjectMonitor* current_pending_monitor() { |
| 749 | // Use Atomic::load() to prevent data race between concurrent modification and |
| 750 | // concurrent readers, e.g. ThreadService::get_current_contended_monitor(). |
| 751 | // Especially, reloading pointer from thread after NULL check must be prevented. |
| 752 | return Atomic::load(&_current_pending_monitor); |
| 753 | } |
| 754 | void set_current_pending_monitor(ObjectMonitor* monitor) { |
| 755 | Atomic::store(&_current_pending_monitor, monitor); |
| 756 | } |
| 757 | void set_current_pending_monitor_is_from_java(bool from_java) { |
| 758 | _current_pending_monitor_is_from_java = from_java; |
| 759 | } |
| 760 | bool current_pending_monitor_is_from_java() { |
| 761 | return _current_pending_monitor_is_from_java; |
| 762 | } |
| 763 | ObjectMonitor* current_waiting_monitor() { |
| 764 | // See the comment in current_pending_monitor() above. |
| 765 | return Atomic::load(&_current_waiting_monitor); |
| 766 | } |
| 767 | void set_current_waiting_monitor(ObjectMonitor* monitor) { |
| 768 | Atomic::store(&_current_waiting_monitor, monitor); |
| 769 | } |
| 770 | |
| 771 | // JNI handle support |
| 772 | JNIHandleBlock* active_handles() const { return _active_handles; } |
| 773 | void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } |
| 774 | JNIHandleBlock* free_handle_block() const { return _free_handle_block; } |
| 775 | void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } |
| 776 | |
| 777 | void push_jni_handle_block(); |
| 778 | void pop_jni_handle_block(); |
| 779 | |
| 780 | private: |
| 781 | MonitorChunk* _monitor_chunks; // Contains the off stack monitors |
| 782 | // allocated during deoptimization |
| 783 | // and by JNI_MonitorEnter/Exit |
| 784 | |
| 785 | enum SuspendFlags { |
| 786 | // NOTE: avoid using the sign-bit as cc generates different test code |
| 787 | // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 |
| 788 | _has_async_exception = 0x00000001U, // there is a pending async exception |
| 789 | _trace_flag = 0x00000004U, // call tracing backend |
| 790 | _obj_deopt = 0x00000008U // suspend for object reallocation and relocking for JVMTI agent |
| 791 | }; |
| 792 | |
| 793 | // various suspension related flags - atomically updated |
| 794 | // overloaded with async exceptions so that we do a single check when transitioning from native->Java |
| 795 | volatile uint32_t _suspend_flags; |
| 796 | |
| 797 | inline void set_suspend_flag(SuspendFlags f); |
| 798 | inline void clear_suspend_flag(SuspendFlags f); |
| 799 | |
| 800 | public: |
| 801 | inline void set_trace_flag(); |
| 802 | inline void clear_trace_flag(); |
| 803 | inline void set_obj_deopt_flag(); |
| 804 | inline void clear_obj_deopt_flag(); |
| 805 | bool is_trace_suspend() { return (_suspend_flags & _trace_flag) != 0; } |
| 806 | bool is_obj_deopt_suspend() { return (_suspend_flags & _obj_deopt) != 0; } |
| 807 | |
| 808 | // Asynchronous exceptions support |
| 809 | private: |
| 810 | oop _pending_async_exception; |
| 811 | #ifdef ASSERT1 |
| 812 | bool _is_unsafe_access_error; |
| 813 | #endif |
| 814 | |
| 815 | inline bool clear_async_exception_condition(); |
| 816 | public: |
| 817 | bool has_async_exception_condition() { |
| 818 | return (_suspend_flags & _has_async_exception) != 0; |
| 819 | } |
| 820 | inline void set_pending_async_exception(oop e); |
| 821 | inline void set_pending_unsafe_access_error(); |
| 822 | static void send_async_exception(JavaThread* jt, oop java_throwable); |
| 823 | void send_thread_stop(oop throwable); |
| 824 | void check_and_handle_async_exceptions(); |
| 825 | |
| 826 | // Safepoint support |
| 827 | public: // Expose _thread_state for SafeFetchInt() |
| 828 | volatile JavaThreadState _thread_state; |
| 829 | private: |
| 830 | SafepointMechanism::ThreadData _poll_data; |
| 831 | ThreadSafepointState* _safepoint_state; // Holds information about a thread during a safepoint |
| 832 | address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened |
| 833 | NOT_PRODUCT(bool _requires_cross_modify_fence;)bool _requires_cross_modify_fence; // State used by VerifyCrossModifyFence |
| 834 | #ifdef ASSERT1 |
| 835 | // Debug support for checking if code allows safepoints or not. |
| 836 | // Safepoints in the VM can happen because of allocation, invoking a VM operation, or blocking on |
| 837 | // mutex, or blocking on an object synchronizer (Java locking). |
| 838 | // If _no_safepoint_count is non-zero, then an assertion failure will happen in any of |
| 839 | // the above cases. The class NoSafepointVerifier is used to set this counter. |
| 840 | int _no_safepoint_count; // If 0, thread allow a safepoint to happen |
| 841 | |
| 842 | public: |
| 843 | void inc_no_safepoint_count() { _no_safepoint_count++; } |
| 844 | void dec_no_safepoint_count() { _no_safepoint_count--; } |
| 845 | #endif // ASSERT |
| 846 | public: |
| 847 | // These functions check conditions before possibly going to a safepoint. |
| 848 | // including NoSafepointVerifier. |
| 849 | void check_for_valid_safepoint_state() NOT_DEBUG_RETURN; |
| 850 | void check_possible_safepoint() NOT_DEBUG_RETURN; |
| 851 | |
| 852 | #ifdef ASSERT1 |
| 853 | private: |
| 854 | volatile uint64_t _visited_for_critical_count; |
| 855 | |
| 856 | public: |
| 857 | void set_visited_for_critical_count(uint64_t safepoint_id) { |
| 858 | assert(_visited_for_critical_count == 0, "Must be reset before set")do { if (!(_visited_for_critical_count == 0)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/thread.hpp" , 858, "assert(" "_visited_for_critical_count == 0" ") failed" , "Must be reset before set"); ::breakpoint(); } } while (0); |
| 859 | assert((safepoint_id & 0x1) == 1, "Must be odd")do { if (!((safepoint_id & 0x1) == 1)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/thread.hpp" , 859, "assert(" "(safepoint_id & 0x1) == 1" ") failed", "Must be odd" ); ::breakpoint(); } } while (0); |
| 860 | _visited_for_critical_count = safepoint_id; |
| 861 | } |
| 862 | void reset_visited_for_critical_count(uint64_t safepoint_id) { |
| 863 | assert(_visited_for_critical_count == safepoint_id, "Was not visited")do { if (!(_visited_for_critical_count == safepoint_id)) { (* g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/thread.hpp" , 863, "assert(" "_visited_for_critical_count == safepoint_id" ") failed", "Was not visited"); ::breakpoint(); } } while (0 ); |
| 864 | _visited_for_critical_count = 0; |
| 865 | } |
| 866 | bool was_visited_for_critical_count(uint64_t safepoint_id) const { |
| 867 | return _visited_for_critical_count == safepoint_id; |
| 868 | } |
| 869 | #endif // ASSERT |
| 870 | |
| 871 | // JavaThread termination support |
| 872 | public: |
| 873 | enum TerminatedTypes { |
| 874 | _not_terminated = 0xDEAD - 2, |
| 875 | _thread_exiting, // JavaThread::exit() has been called for this thread |
| 876 | _thread_terminated, // JavaThread is removed from thread list |
| 877 | _vm_exited // JavaThread is still executing native code, but VM is terminated |
| 878 | // only VM_Exit can set _vm_exited |
| 879 | }; |
| 880 | |
| 881 | private: |
| 882 | // In general a JavaThread's _terminated field transitions as follows: |
| 883 | // |
| 884 | // _not_terminated => _thread_exiting => _thread_terminated |
| 885 | // |
| 886 | // _vm_exited is a special value to cover the case of a JavaThread |
| 887 | // executing native code after the VM itself is terminated. |
| 888 | volatile TerminatedTypes _terminated; |
| 889 | |
| 890 | jint _in_deopt_handler; // count of deoptimization |
| 891 | // handlers thread is in |
| 892 | volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access |
| 893 | bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was |
| 894 | // never locked) when throwing an exception. Used by interpreter only. |
| 895 | |
| 896 | // JNI attach states: |
| 897 | enum JNIAttachStates { |
| 898 | _not_attaching_via_jni = 1, // thread is not attaching via JNI |
| 899 | _attaching_via_jni, // thread is attaching via JNI |
| 900 | _attached_via_jni // thread has attached via JNI |
| 901 | }; |
| 902 | |
| 903 | // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni. |
| 904 | // A native thread that is attaching via JNI starts with a value |
| 905 | // of _attaching_via_jni and transitions to _attached_via_jni. |
| 906 | volatile JNIAttachStates _jni_attach_state; |
| 907 | |
| 908 | |
| 909 | #if INCLUDE_JVMCI1 |
| 910 | // The _pending_* fields below are used to communicate extra information |
| 911 | // from an uncommon trap in JVMCI compiled code to the uncommon trap handler. |
| 912 | |
| 913 | // Communicates the DeoptReason and DeoptAction of the uncommon trap |
| 914 | int _pending_deoptimization; |
| 915 | |
| 916 | // Specifies whether the uncommon trap is to bci 0 of a synchronized method |
| 917 | // before the monitor has been acquired. |
| 918 | bool _pending_monitorenter; |
| 919 | |
| 920 | // Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter |
| 921 | bool _pending_transfer_to_interpreter; |
| 922 | |
| 923 | // True if in a runtime call from compiled code that will deoptimize |
| 924 | // and re-execute a failed heap allocation in the interpreter. |
| 925 | bool _in_retryable_allocation; |
| 926 | |
| 927 | // An id of a speculation that JVMCI compiled code can use to further describe and |
| 928 | // uniquely identify the speculative optimization guarded by an uncommon trap. |
| 929 | // See JVMCINMethodData::SPECULATION_LENGTH_BITS for further details. |
| 930 | jlong _pending_failed_speculation; |
| 931 | |
| 932 | // These fields are mutually exclusive in terms of live ranges. |
| 933 | union { |
| 934 | // Communicates the pc at which the most recent implicit exception occurred |
| 935 | // from the signal handler to a deoptimization stub. |
| 936 | address _implicit_exception_pc; |
| 937 | |
| 938 | // Communicates an alternative call target to an i2c stub from a JavaCall . |
| 939 | address _alternate_call_target; |
| 940 | } _jvmci; |
| 941 | |
| 942 | // Support for high precision, thread sensitive counters in JVMCI compiled code. |
| 943 | jlong* _jvmci_counters; |
| 944 | |
| 945 | // Fast thread locals for use by JVMCI |
| 946 | jlong _jvmci_reserved0; |
| 947 | jlong _jvmci_reserved1; |
| 948 | oop _jvmci_reserved_oop0; |
| 949 | |
| 950 | public: |
| 951 | static jlong* _jvmci_old_thread_counters; |
| 952 | static void collect_counters(jlong* array, int length); |
| 953 | |
| 954 | bool resize_counters(int current_size, int new_size); |
| 955 | |
| 956 | static bool resize_all_jvmci_counters(int new_size); |
| 957 | |
| 958 | void set_jvmci_reserved_oop0(oop value) { |
| 959 | _jvmci_reserved_oop0 = value; |
| 960 | } |
| 961 | |
| 962 | oop get_jvmci_reserved_oop0() { |
| 963 | return _jvmci_reserved_oop0; |
| 964 | } |
| 965 | |
| 966 | void set_jvmci_reserved0(jlong value) { |
| 967 | _jvmci_reserved0 = value; |
| 968 | } |
| 969 | |
| 970 | jlong get_jvmci_reserved0() { |
| 971 | return _jvmci_reserved0; |
| 972 | } |
| 973 | |
| 974 | void set_jvmci_reserved1(jlong value) { |
| 975 | _jvmci_reserved1 = value; |
| 976 | } |
| 977 | |
| 978 | jlong get_jvmci_reserved1() { |
| 979 | return _jvmci_reserved1; |
| 980 | } |
| 981 | |
| 982 | private: |
| 983 | #endif // INCLUDE_JVMCI |
| 984 | |
| 985 | StackOverflow _stack_overflow_state; |
| 986 | |
| 987 | // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is |
| 988 | // used to temp. parsing values into and out of the runtime system during exception handling for compiled |
| 989 | // code) |
| 990 | volatile oop _exception_oop; // Exception thrown in compiled code |
| 991 | volatile address _exception_pc; // PC where exception happened |
| 992 | volatile address _exception_handler_pc; // PC for handler of exception |
| 993 | volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. |
| 994 | |
| 995 | private: |
| 996 | // support for JNI critical regions |
| 997 | jint _jni_active_critical; // count of entries into JNI critical region |
| 998 | |
| 999 | // Checked JNI: function name requires exception check |
| 1000 | char* _pending_jni_exception_check_fn; |
| 1001 | |
| 1002 | // For deadlock detection. |
| 1003 | int _depth_first_number; |
| 1004 | |
| 1005 | // JVMTI PopFrame support |
| 1006 | // This is set to popframe_pending to signal that top Java frame should be popped immediately |
| 1007 | int _popframe_condition; |
| 1008 | |
| 1009 | // If reallocation of scalar replaced objects fails, we throw OOM |
| 1010 | // and during exception propagation, pop the top |
| 1011 | // _frames_to_pop_failed_realloc frames, the ones that reference |
| 1012 | // failed reallocations. |
| 1013 | int _frames_to_pop_failed_realloc; |
| 1014 | |
| 1015 | friend class VMThread; |
| 1016 | friend class ThreadWaitTransition; |
| 1017 | friend class VM_Exit; |
| 1018 | |
| 1019 | // Stack watermark barriers. |
| 1020 | StackWatermarks _stack_watermarks; |
| 1021 | |
| 1022 | public: |
| 1023 | inline StackWatermarks* stack_watermarks() { return &_stack_watermarks; } |
| 1024 | |
| 1025 | public: |
| 1026 | // Constructor |
| 1027 | JavaThread(); // delegating constructor |
| 1028 | JavaThread(bool is_attaching_via_jni); // for main thread and JNI attached threads |
| 1029 | JavaThread(ThreadFunction entry_point, size_t stack_size = 0); |
| 1030 | ~JavaThread(); |
| 1031 | |
| 1032 | #ifdef ASSERT1 |
| 1033 | // verify this JavaThread hasn't be published in the Threads::list yet |
| 1034 | void verify_not_published(); |
| 1035 | #endif // ASSERT |
| 1036 | |
| 1037 | StackOverflow* stack_overflow_state() { return &_stack_overflow_state; } |
| 1038 | |
| 1039 | //JNI functiontable getter/setter for JVMTI jni function table interception API. |
| 1040 | void set_jni_functions(struct JNINativeInterface_* functionTable) { |
| 1041 | _jni_environment.functions = functionTable; |
| 1042 | } |
| 1043 | struct JNINativeInterface_* get_jni_functions() { |
| 1044 | return (struct JNINativeInterface_ *)_jni_environment.functions; |
| 1045 | } |
| 1046 | |
| 1047 | // This function is called at thread creation to allow |
| 1048 | // platform specific thread variables to be initialized. |
| 1049 | void cache_global_variables(); |
| 1050 | |
| 1051 | // Executes Shutdown.shutdown() |
| 1052 | void invoke_shutdown_hooks(); |
| 1053 | |
| 1054 | // Cleanup on thread exit |
| 1055 | enum ExitType { |
| 1056 | normal_exit, |
| 1057 | jni_detach |
| 1058 | }; |
| 1059 | void exit(bool destroy_vm, ExitType exit_type = normal_exit); |
| 1060 | |
| 1061 | void cleanup_failed_attach_current_thread(bool is_daemon); |
| 1062 | |
| 1063 | // Testers |
| 1064 | virtual bool is_Java_thread() const { return true; } |
| 1065 | virtual bool can_call_java() const { return true; } |
| 1066 | |
| 1067 | virtual bool is_active_Java_thread() const { |
| 1068 | return on_thread_list() && !is_terminated(); |
| 1069 | } |
| 1070 | |
| 1071 | // Thread oop. threadObj() can be NULL for initial JavaThread |
| 1072 | // (or for threads attached via JNI) |
| 1073 | oop threadObj() const; |
| 1074 | void set_threadObj(oop p); |
| 1075 | |
| 1076 | // Prepare thread and add to priority queue. If a priority is |
| 1077 | // not specified, use the priority of the thread object. Threads_lock |
| 1078 | // must be held while this function is called. |
| 1079 | void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); |
| 1080 | |
| 1081 | void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } |
| 1082 | address saved_exception_pc() { return _saved_exception_pc; } |
| 1083 | |
| 1084 | ThreadFunction entry_point() const { return _entry_point; } |
| 1085 | |
| 1086 | // Allocates a new Java level thread object for this thread. thread_name may be NULL. |
| 1087 | void allocate_threadObj(Handle thread_group, const char* thread_name, bool daemon, TRAPSJavaThread* __the_thread__); |
| 1088 | |
| 1089 | // Last frame anchor routines |
| 1090 | |
| 1091 | JavaFrameAnchor* frame_anchor(void) { return &_anchor; } |
| 1092 | |
| 1093 | // last_Java_sp |
| 1094 | bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } |
| 1095 | intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } |
| 1096 | |
| 1097 | // last_Java_pc |
| 1098 | |
| 1099 | address last_Java_pc(void) { return _anchor.last_Java_pc(); } |
| 1100 | |
| 1101 | // Safepoint support |
| 1102 | inline JavaThreadState thread_state() const; |
| 1103 | inline void set_thread_state(JavaThreadState s); |
| 1104 | inline void set_thread_state_fence(JavaThreadState s); // fence after setting thread state |
| 1105 | inline ThreadSafepointState* safepoint_state() const; |
| 1106 | inline void set_safepoint_state(ThreadSafepointState* state); |
| 1107 | inline bool is_at_poll_safepoint(); |
| 1108 | |
| 1109 | // JavaThread termination and lifecycle support: |
| 1110 | void smr_delete(); |
| 1111 | bool on_thread_list() const { return _on_thread_list; } |
| 1112 | void set_on_thread_list() { _on_thread_list = true; } |
| 1113 | |
| 1114 | // thread has called JavaThread::exit() or is terminated |
| 1115 | bool is_exiting() const; |
| 1116 | // thread is terminated (no longer on the threads list); we compare |
| 1117 | // against the two non-terminated values so that a freed JavaThread |
| 1118 | // will also be considered terminated. |
| 1119 | bool check_is_terminated(TerminatedTypes l_terminated) const { |
| 1120 | return l_terminated != _not_terminated && l_terminated != _thread_exiting; |
| 1121 | } |
| 1122 | bool is_terminated() const; |
| 1123 | void set_terminated(TerminatedTypes t); |
| 1124 | |
| 1125 | void block_if_vm_exited(); |
| 1126 | |
| 1127 | bool doing_unsafe_access() { return _doing_unsafe_access; } |
| 1128 | void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } |
| 1129 | |
| 1130 | bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } |
| 1131 | void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } |
| 1132 | |
| 1133 | SafepointMechanism::ThreadData* poll_data() { return &_poll_data; } |
| 1134 | |
| 1135 | void set_requires_cross_modify_fence(bool val) PRODUCT_RETURN NOT_PRODUCT({ _requires_cross_modify_fence = val; }){ _requires_cross_modify_fence = val; } |
| 1136 | |
| 1137 | private: |
| 1138 | DEBUG_ONLY(void verify_frame_info();)void verify_frame_info(); |
| 1139 | |
| 1140 | // Support for thread handshake operations |
| 1141 | HandshakeState _handshake; |
| 1142 | public: |
| 1143 | HandshakeState* handshake_state() { return &_handshake; } |
| 1144 | |
| 1145 | // A JavaThread can always safely operate on it self and other threads |
| 1146 | // can do it safely if they are the active handshaker. |
| 1147 | bool is_handshake_safe_for(Thread* th) const { |
| 1148 | return _handshake.active_handshaker() == th || this == th; |
| 1149 | } |
| 1150 | |
| 1151 | // Suspend/resume support for JavaThread |
| 1152 | bool java_suspend(); // higher-level suspension logic called by the public APIs |
| 1153 | bool java_resume(); // higher-level resume logic called by the public APIs |
| 1154 | bool is_suspended() { return _handshake.is_suspended(); } |
| 1155 | |
| 1156 | // Check for async exception in addition to safepoint. |
| 1157 | static void check_special_condition_for_native_trans(JavaThread *thread); |
| 1158 | |
| 1159 | // Synchronize with another thread that is deoptimizing objects of the |
| 1160 | // current thread, i.e. reverts optimizations based on escape analysis. |
| 1161 | void wait_for_object_deoptimization(); |
| 1162 | |
| 1163 | // these next two are also used for self-suspension and async exception support |
| 1164 | void handle_special_runtime_exit_condition(bool check_asyncs = true); |
| 1165 | |
| 1166 | // Return true if JavaThread has an asynchronous condition or |
| 1167 | // if external suspension is requested. |
| 1168 | bool has_special_runtime_exit_condition() { |
| 1169 | return (_suspend_flags & (_has_async_exception | _obj_deopt JFR_ONLY(| _trace_flag)| _trace_flag)) != 0; |
| 1170 | } |
| 1171 | |
| 1172 | // Fast-locking support |
| 1173 | bool is_lock_owned(address adr) const; |
| 1174 | |
| 1175 | // Accessors for vframe array top |
| 1176 | // The linked list of vframe arrays are sorted on sp. This means when we |
| 1177 | // unpack the head must contain the vframe array to unpack. |
| 1178 | void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } |
| 1179 | vframeArray* vframe_array_head() const { return _vframe_array_head; } |
| 1180 | |
| 1181 | // Side structure for deferring update of java frame locals until deopt occurs |
| 1182 | JvmtiDeferredUpdates* deferred_updates() const { return _jvmti_deferred_updates; } |
| 1183 | void set_deferred_updates(JvmtiDeferredUpdates* du) { _jvmti_deferred_updates = du; } |
| 1184 | |
| 1185 | // These only really exist to make debugging deopt problems simpler |
| 1186 | |
| 1187 | void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } |
| 1188 | vframeArray* vframe_array_last() const { return _vframe_array_last; } |
| 1189 | |
| 1190 | // The special resourceMark used during deoptimization |
| 1191 | |
| 1192 | void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } |
| 1193 | DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } |
| 1194 | |
| 1195 | void set_deopt_compiled_method(CompiledMethod* nm) { _deopt_nmethod = nm; } |
| 1196 | CompiledMethod* deopt_compiled_method() { return _deopt_nmethod; } |
| 1197 | |
| 1198 | Method* callee_target() const { return _callee_target; } |
| 1199 | void set_callee_target (Method* x) { _callee_target = x; } |
| 1200 | |
| 1201 | // Oop results of vm runtime calls |
| 1202 | oop vm_result() const { return _vm_result; } |
| 1203 | void set_vm_result (oop x) { _vm_result = x; } |
| 1204 | |
| 1205 | Metadata* vm_result_2() const { return _vm_result_2; } |
| 1206 | void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; } |
| 1207 | |
| 1208 | MemRegion deferred_card_mark() const { return _deferred_card_mark; } |
| 1209 | void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } |
| 1210 | |
| 1211 | #if INCLUDE_JVMCI1 |
| 1212 | int pending_deoptimization() const { return _pending_deoptimization; } |
| 1213 | jlong pending_failed_speculation() const { return _pending_failed_speculation; } |
| 1214 | bool has_pending_monitorenter() const { return _pending_monitorenter; } |
| 1215 | void set_pending_monitorenter(bool b) { _pending_monitorenter = b; } |
| 1216 | void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; } |
| 1217 | void set_pending_failed_speculation(jlong failed_speculation) { _pending_failed_speculation = failed_speculation; } |
| 1218 | void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; } |
| 1219 | void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be")do { if (!(_jvmci._alternate_call_target == __null)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/thread.hpp" , 1219, "assert(" "_jvmci._alternate_call_target == __null" ") failed" , "must be"); ::breakpoint(); } } while (0); _jvmci._alternate_call_target = a; } |
| 1220 | void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be")do { if (!(_jvmci._implicit_exception_pc == __null)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/thread.hpp" , 1220, "assert(" "_jvmci._implicit_exception_pc == __null" ") failed" , "must be"); ::breakpoint(); } } while (0); _jvmci._implicit_exception_pc = a; } |
| 1221 | |
| 1222 | virtual bool in_retryable_allocation() const { return _in_retryable_allocation; } |
| 1223 | void set_in_retryable_allocation(bool b) { _in_retryable_allocation = b; } |
| 1224 | #endif // INCLUDE_JVMCI |
| 1225 | |
| 1226 | // Exception handling for compiled methods |
| 1227 | oop exception_oop() const; |
| 1228 | address exception_pc() const { return _exception_pc; } |
| 1229 | address exception_handler_pc() const { return _exception_handler_pc; } |
| 1230 | bool is_method_handle_return() const { return _is_method_handle_return == 1; } |
| 1231 | |
| 1232 | void set_exception_oop(oop o); |
| 1233 | void set_exception_pc(address a) { _exception_pc = a; } |
| 1234 | void set_exception_handler_pc(address a) { _exception_handler_pc = a; } |
| 1235 | void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } |
| 1236 | |
| 1237 | void clear_exception_oop_and_pc() { |
| 1238 | set_exception_oop(NULL__null); |
| 1239 | set_exception_pc(NULL__null); |
| 1240 | } |
| 1241 | |
| 1242 | // Check if address is in the usable part of the stack (excludes protected |
| 1243 | // guard pages). Can be applied to any thread and is an approximation for |
| 1244 | // using is_in_live_stack when the query has to happen from another thread. |
| 1245 | bool is_in_usable_stack(address adr) const { |
| 1246 | return is_in_stack_range_incl(adr, _stack_overflow_state.stack_reserved_zone_base()); |
| 1247 | } |
| 1248 | |
| 1249 | // Misc. accessors/mutators |
| 1250 | void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } |
| 1251 | void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } |
| 1252 | bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } |
| 1253 | |
| 1254 | // For assembly stub generation |
| 1255 | static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_threadObj ) - 16)); } |
| 1256 | static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_jni_environment ) - 16)); } |
| 1257 | static ByteSize pending_jni_exception_check_fn_offset() { |
| 1258 | return byte_offset_of(JavaThread, _pending_jni_exception_check_fn)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_pending_jni_exception_check_fn ) - 16)); |
| 1259 | } |
| 1260 | static ByteSize last_Java_sp_offset() { |
| 1261 | return byte_offset_of(JavaThread, _anchor)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_anchor ) - 16)) + JavaFrameAnchor::last_Java_sp_offset(); |
| 1262 | } |
| 1263 | static ByteSize last_Java_pc_offset() { |
| 1264 | return byte_offset_of(JavaThread, _anchor)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_anchor ) - 16)) + JavaFrameAnchor::last_Java_pc_offset(); |
| 1265 | } |
| 1266 | static ByteSize frame_anchor_offset() { |
| 1267 | return byte_offset_of(JavaThread, _anchor)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_anchor ) - 16)); |
| 1268 | } |
| 1269 | static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_callee_target ) - 16)); } |
| 1270 | static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_vm_result ) - 16)); } |
| 1271 | static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_vm_result_2 ) - 16)); } |
| 1272 | static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_thread_state ) - 16)); } |
| 1273 | static ByteSize polling_word_offset() { return byte_offset_of(JavaThread, _poll_data)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_poll_data ) - 16)) + byte_offset_of(SafepointMechanism::ThreadData, _polling_word)in_ByteSize((int)(size_t)((intx)&(((SafepointMechanism::ThreadData *)16)->_polling_word) - 16));} |
| 1274 | static ByteSize polling_page_offset() { return byte_offset_of(JavaThread, _poll_data)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_poll_data ) - 16)) + byte_offset_of(SafepointMechanism::ThreadData, _polling_page)in_ByteSize((int)(size_t)((intx)&(((SafepointMechanism::ThreadData *)16)->_polling_page) - 16));} |
| 1275 | static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_saved_exception_pc ) - 16)); } |
| 1276 | static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_osthread ) - 16)); } |
| 1277 | #if INCLUDE_JVMCI1 |
| 1278 | static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_pending_deoptimization ) - 16)); } |
| 1279 | static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_pending_monitorenter ) - 16)); } |
| 1280 | static ByteSize pending_failed_speculation_offset() { return byte_offset_of(JavaThread, _pending_failed_speculation)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_pending_failed_speculation ) - 16)); } |
| 1281 | static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_jvmci ._alternate_call_target) - 16)); } |
| 1282 | static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_jvmci ._implicit_exception_pc) - 16)); } |
| 1283 | static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_jvmci_counters ) - 16)); } |
| 1284 | #endif // INCLUDE_JVMCI |
| 1285 | static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_exception_oop ) - 16)); } |
| 1286 | static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_exception_pc ) - 16)); } |
| 1287 | static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_exception_handler_pc ) - 16)); } |
| 1288 | static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_is_method_handle_return ) - 16)); } |
| 1289 | |
| 1290 | static ByteSize active_handles_offset() { return byte_offset_of(JavaThread, _active_handles)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_active_handles ) - 16)); } |
| 1291 | |
| 1292 | // StackOverflow offsets |
| 1293 | static ByteSize stack_overflow_limit_offset() { |
| 1294 | return byte_offset_of(JavaThread, _stack_overflow_state._stack_overflow_limit)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_stack_overflow_state ._stack_overflow_limit) - 16)); |
| 1295 | } |
| 1296 | static ByteSize stack_guard_state_offset() { |
| 1297 | return byte_offset_of(JavaThread, _stack_overflow_state._stack_guard_state)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_stack_overflow_state ._stack_guard_state) - 16)); |
| 1298 | } |
| 1299 | static ByteSize reserved_stack_activation_offset() { |
| 1300 | return byte_offset_of(JavaThread, _stack_overflow_state._reserved_stack_activation)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_stack_overflow_state ._reserved_stack_activation) - 16)); |
| 1301 | } |
| 1302 | |
| 1303 | static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_suspend_flags ) - 16)); } |
| 1304 | |
| 1305 | static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_do_not_unlock_if_synchronized ) - 16)); } |
| 1306 | static ByteSize should_post_on_exceptions_flag_offset() { |
| 1307 | return byte_offset_of(JavaThread, _should_post_on_exceptions_flag)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_should_post_on_exceptions_flag ) - 16)); |
| 1308 | } |
| 1309 | static ByteSize doing_unsafe_access_offset() { return byte_offset_of(JavaThread, _doing_unsafe_access)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_doing_unsafe_access ) - 16)); } |
| 1310 | NOT_PRODUCT(static ByteSize requires_cross_modify_fence_offset() { return byte_offset_of(JavaThread, _requires_cross_modify_fence); })static ByteSize requires_cross_modify_fence_offset() { return in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)-> _requires_cross_modify_fence) - 16)); } |
| 1311 | |
| 1312 | // Returns the jni environment for this thread |
| 1313 | JNIEnv* jni_environment() { return &_jni_environment; } |
| 1314 | |
| 1315 | static JavaThread* thread_from_jni_environment(JNIEnv* env) { |
| 1316 | JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); |
| 1317 | // Only return NULL if thread is off the thread list; starting to |
| 1318 | // exit should not return NULL. |
| 1319 | if (thread_from_jni_env->is_terminated()) { |
| 1320 | thread_from_jni_env->block_if_vm_exited(); |
| 1321 | return NULL__null; |
| 1322 | } else { |
| 1323 | return thread_from_jni_env; |
| 1324 | } |
| 1325 | } |
| 1326 | |
| 1327 | // JNI critical regions. These can nest. |
| 1328 | bool in_critical() { return _jni_active_critical > 0; } |
| 1329 | bool in_last_critical() { return _jni_active_critical == 1; } |
| 1330 | inline void enter_critical(); |
| 1331 | void exit_critical() { |
| 1332 | assert(Thread::current() == this, "this must be current thread")do { if (!(Thread::current() == this)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/thread.hpp" , 1332, "assert(" "Thread::current() == this" ") failed", "this must be current thread" ); ::breakpoint(); } } while (0); |
| 1333 | _jni_active_critical--; |
| 1334 | assert(_jni_active_critical >= 0, "JNI critical nesting problem?")do { if (!(_jni_active_critical >= 0)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/thread.hpp" , 1334, "assert(" "_jni_active_critical >= 0" ") failed", "JNI critical nesting problem?" ); ::breakpoint(); } } while (0); |
| 1335 | } |
| 1336 | |
| 1337 | // Checked JNI: is the programmer required to check for exceptions, if so specify |
| 1338 | // which function name. Returning to a Java frame should implicitly clear the |
| 1339 | // pending check, this is done for Native->Java transitions (i.e. user JNI code). |
| 1340 | // VM->Java transistions are not cleared, it is expected that JNI code enclosed |
| 1341 | // within ThreadToNativeFromVM makes proper exception checks (i.e. VM internal). |
| 1342 | bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL__null; } |
| 1343 | void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL__null; } |
| 1344 | const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; } |
| 1345 | void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; } |
| 1346 | |
| 1347 | // For deadlock detection |
| 1348 | int depth_first_number() { return _depth_first_number; } |
| 1349 | void set_depth_first_number(int dfn) { _depth_first_number = dfn; } |
| 1350 | |
| 1351 | private: |
| 1352 | void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } |
| 1353 | |
| 1354 | public: |
| 1355 | MonitorChunk* monitor_chunks() const { return _monitor_chunks; } |
| 1356 | void add_monitor_chunk(MonitorChunk* chunk); |
| 1357 | void remove_monitor_chunk(MonitorChunk* chunk); |
| 1358 | bool in_deopt_handler() const { return _in_deopt_handler > 0; } |
| 1359 | void inc_in_deopt_handler() { _in_deopt_handler++; } |
| 1360 | void dec_in_deopt_handler() { |
| 1361 | assert(_in_deopt_handler > 0, "mismatched deopt nesting")do { if (!(_in_deopt_handler > 0)) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/thread.hpp" , 1361, "assert(" "_in_deopt_handler > 0" ") failed", "mismatched deopt nesting" ); ::breakpoint(); } } while (0); |
| 1362 | if (_in_deopt_handler > 0) { // robustness |
| 1363 | _in_deopt_handler--; |
| 1364 | } |
| 1365 | } |
| 1366 | |
| 1367 | private: |
| 1368 | void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } |
| 1369 | |
| 1370 | // factor out low-level mechanics for use in both normal and error cases |
| 1371 | const char* get_thread_name_string(char* buf = NULL__null, int buflen = 0) const; |
| 1372 | |
| 1373 | public: |
| 1374 | |
| 1375 | // Frame iteration; calls the function f for all frames on the stack |
| 1376 | void frames_do(void f(frame*, const RegisterMap*)); |
| 1377 | |
| 1378 | // Memory operations |
| 1379 | void oops_do_frames(OopClosure* f, CodeBlobClosure* cf); |
| 1380 | void oops_do_no_frames(OopClosure* f, CodeBlobClosure* cf); |
| 1381 | |
| 1382 | // Sweeper operations |
| 1383 | virtual void nmethods_do(CodeBlobClosure* cf); |
| 1384 | |
| 1385 | // RedefineClasses Support |
| 1386 | void metadata_do(MetadataClosure* f); |
| 1387 | |
| 1388 | // Debug method asserting thread states are correct during a handshake operation. |
| 1389 | DEBUG_ONLY(void verify_states_for_handshake();)void verify_states_for_handshake(); |
| 1390 | |
| 1391 | // Misc. operations |
| 1392 | const char* name() const; |
| 1393 | const char* type_name() const { return "JavaThread"; } |
| 1394 | static const char* name_for(oop thread_obj); |
| 1395 | |
| 1396 | void print_on(outputStream* st, bool print_extended_info) const; |
| 1397 | void print_on(outputStream* st) const { print_on(st, false); } |
| 1398 | void print() const; |
| 1399 | void print_thread_state_on(outputStream*) const PRODUCT_RETURN; |
| 1400 | void print_on_error(outputStream* st, char* buf, int buflen) const; |
| 1401 | void print_name_on_error(outputStream* st, char* buf, int buflen) const; |
| 1402 | void verify(); |
| 1403 | |
| 1404 | // Accessing frames |
| 1405 | frame last_frame() { |
| 1406 | _anchor.make_walkable(this); |
| 1407 | return pd_last_frame(); |
| 1408 | } |
| 1409 | javaVFrame* last_java_vframe(RegisterMap* reg_map); |
| 1410 | |
| 1411 | // Returns method at 'depth' java or native frames down the stack |
| 1412 | // Used for security checks |
| 1413 | Klass* security_get_caller_class(int depth); |
| 1414 | |
| 1415 | // Print stack trace in external format |
| 1416 | void print_stack_on(outputStream* st); |
| 1417 | void print_stack() { print_stack_on(tty); } |
| 1418 | |
| 1419 | // Print stack traces in various internal formats |
| 1420 | void trace_stack() PRODUCT_RETURN; |
| 1421 | void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; |
| 1422 | void trace_frames() PRODUCT_RETURN; |
| 1423 | |
| 1424 | // Print an annotated view of the stack frames |
| 1425 | void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN; |
| 1426 | void validate_frame_layout() { |
| 1427 | print_frame_layout(0, true); |
| 1428 | } |
| 1429 | |
| 1430 | // Function for testing deoptimization |
| 1431 | void deoptimize(); |
| 1432 | void make_zombies(); |
| 1433 | |
| 1434 | void deoptimize_marked_methods(); |
| 1435 | |
| 1436 | public: |
| 1437 | // Returns the running thread as a JavaThread |
| 1438 | static JavaThread* current() { |
| 1439 | return JavaThread::cast(Thread::current()); |
| 1440 | } |
| 1441 | |
| 1442 | // Returns the current thread as a JavaThread, or NULL if not attached |
| 1443 | static inline JavaThread* current_or_null(); |
| 1444 | |
| 1445 | // Casts |
| 1446 | static JavaThread* cast(Thread* t) { |
| 1447 | assert(t->is_Java_thread(), "incorrect cast to JavaThread")do { if (!(t->is_Java_thread())) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/thread.hpp" , 1447, "assert(" "t->is_Java_thread()" ") failed", "incorrect cast to JavaThread" ); ::breakpoint(); } } while (0); |
| 1448 | return static_cast<JavaThread*>(t); |
| 1449 | } |
| 1450 | |
| 1451 | static const JavaThread* cast(const Thread* t) { |
| 1452 | assert(t->is_Java_thread(), "incorrect cast to const JavaThread")do { if (!(t->is_Java_thread())) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/thread.hpp" , 1452, "assert(" "t->is_Java_thread()" ") failed", "incorrect cast to const JavaThread" ); ::breakpoint(); } } while (0); |
| 1453 | return static_cast<const JavaThread*>(t); |
| 1454 | } |
| 1455 | |
| 1456 | // Returns the active Java thread. Do not use this if you know you are calling |
| 1457 | // from a JavaThread, as it's slower than JavaThread::current. If called from |
| 1458 | // the VMThread, it also returns the JavaThread that instigated the VMThread's |
| 1459 | // operation. You may not want that either. |
| 1460 | static JavaThread* active(); |
| 1461 | |
| 1462 | protected: |
| 1463 | virtual void pre_run(); |
| 1464 | virtual void run(); |
| 1465 | void thread_main_inner(); |
| 1466 | virtual void post_run(); |
| 1467 | |
| 1468 | public: |
| 1469 | // Thread local information maintained by JVMTI. |
| 1470 | void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } |
| 1471 | // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() |
| 1472 | // getter is used to get this JavaThread's JvmtiThreadState if it has |
| 1473 | // one which means NULL can be returned. JvmtiThreadState::state_for() |
| 1474 | // is used to get the specified JavaThread's JvmtiThreadState if it has |
| 1475 | // one or it allocates a new JvmtiThreadState for the JavaThread and |
| 1476 | // returns it. JvmtiThreadState::state_for() will return NULL only if |
| 1477 | // the specified JavaThread is exiting. |
| 1478 | JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } |
| 1479 | static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_jvmti_thread_state ) - 16)); } |
| 1480 | |
| 1481 | // JVMTI PopFrame support |
| 1482 | // Setting and clearing popframe_condition |
| 1483 | // All of these enumerated values are bits. popframe_pending |
| 1484 | // indicates that a PopFrame() has been requested and not yet been |
| 1485 | // completed. popframe_processing indicates that that PopFrame() is in |
| 1486 | // the process of being completed. popframe_force_deopt_reexecution_bit |
| 1487 | // indicates that special handling is required when returning to a |
| 1488 | // deoptimized caller. |
| 1489 | enum PopCondition { |
| 1490 | popframe_inactive = 0x00, |
| 1491 | popframe_pending_bit = 0x01, |
| 1492 | popframe_processing_bit = 0x02, |
| 1493 | popframe_force_deopt_reexecution_bit = 0x04 |
| 1494 | }; |
| 1495 | PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } |
| 1496 | void set_popframe_condition(PopCondition c) { _popframe_condition = c; } |
| 1497 | void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } |
| 1498 | void clear_popframe_condition() { _popframe_condition = popframe_inactive; } |
| 1499 | static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_popframe_condition ) - 16)); } |
| 1500 | bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } |
| 1501 | bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } |
| 1502 | void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } |
| 1503 | |
| 1504 | bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } |
| 1505 | void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } |
| 1506 | void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } |
| 1507 | |
| 1508 | int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; } |
| 1509 | void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; } |
| 1510 | void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; } |
| 1511 | |
| 1512 | private: |
| 1513 | // Saved incoming arguments to popped frame. |
| 1514 | // Used only when popped interpreted frame returns to deoptimized frame. |
| 1515 | void* _popframe_preserved_args; |
| 1516 | int _popframe_preserved_args_size; |
| 1517 | |
| 1518 | public: |
| 1519 | void popframe_preserve_args(ByteSize size_in_bytes, void* start); |
| 1520 | void* popframe_preserved_args(); |
| 1521 | ByteSize popframe_preserved_args_size(); |
| 1522 | WordSize popframe_preserved_args_size_in_words(); |
| 1523 | void popframe_free_preserved_args(); |
| 1524 | |
| 1525 | |
| 1526 | private: |
| 1527 | JvmtiThreadState *_jvmti_thread_state; |
| 1528 | |
| 1529 | // Used by the interpreter in fullspeed mode for frame pop, method |
| 1530 | // entry, method exit and single stepping support. This field is |
| 1531 | // only set to non-zero at a safepoint or using a direct handshake |
| 1532 | // (see EnterInterpOnlyModeClosure). |
| 1533 | // It can be set to zero asynchronously to this threads execution (i.e., without |
| 1534 | // safepoint/handshake or a lock) so we have to be very careful. |
| 1535 | // Accesses by other threads are synchronized using JvmtiThreadState_lock though. |
| 1536 | int _interp_only_mode; |
| 1537 | |
| 1538 | public: |
| 1539 | // used by the interpreter for fullspeed debugging support (see above) |
| 1540 | static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode)in_ByteSize((int)(size_t)((intx)&(((JavaThread*)16)->_interp_only_mode ) - 16)); } |
| 1541 | bool is_interp_only_mode() { return (_interp_only_mode != 0); } |
| 1542 | int get_interp_only_mode() { return _interp_only_mode; } |
| 1543 | void increment_interp_only_mode() { ++_interp_only_mode; } |
| 1544 | void decrement_interp_only_mode() { --_interp_only_mode; } |
| 1545 | |
| 1546 | // support for cached flag that indicates whether exceptions need to be posted for this thread |
| 1547 | // if this is false, we can avoid deoptimizing when events are thrown |
| 1548 | // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything |
| 1549 | private: |
| 1550 | int _should_post_on_exceptions_flag; |
| 1551 | |
| 1552 | public: |
| 1553 | int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } |
| 1554 | void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } |
| 1555 | |
| 1556 | private: |
| 1557 | ThreadStatistics *_thread_stat; |
| 1558 | |
| 1559 | public: |
| 1560 | ThreadStatistics* get_thread_stat() const { return _thread_stat; } |
| 1561 | |
| 1562 | // Return a blocker object for which this thread is blocked parking. |
| 1563 | oop current_park_blocker(); |
| 1564 | |
| 1565 | private: |
| 1566 | static size_t _stack_size_at_create; |
| 1567 | |
| 1568 | public: |
| 1569 | static inline size_t stack_size_at_create(void) { |
| 1570 | return _stack_size_at_create; |
| 1571 | } |
| 1572 | static inline void set_stack_size_at_create(size_t value) { |
| 1573 | _stack_size_at_create = value; |
| 1574 | } |
| 1575 | |
| 1576 | // Machine dependent stuff |
| 1577 | #include OS_CPU_HEADER(thread)"thread_linux_x86.hpp" |
| 1578 | |
| 1579 | // JSR166 per-thread parker |
| 1580 | private: |
| 1581 | Parker _parker; |
| 1582 | public: |
| 1583 | Parker* parker() { return &_parker; } |
| 1584 | |
| 1585 | public: |
| 1586 | // clearing/querying jni attach status |
| 1587 | bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; } |
| 1588 | bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; } |
| 1589 | inline void set_done_attaching_via_jni(); |
| 1590 | |
| 1591 | // Stack dump assistance: |
| 1592 | // Track the class we want to initialize but for which we have to wait |
| 1593 | // on its init_lock() because it is already being initialized. |
| 1594 | void set_class_to_be_initialized(InstanceKlass* k); |
| 1595 | InstanceKlass* class_to_be_initialized() const; |
| 1596 | |
| 1597 | private: |
| 1598 | InstanceKlass* _class_to_be_initialized; |
| 1599 | |
| 1600 | // java.lang.Thread.sleep support |
| 1601 | ParkEvent * _SleepEvent; |
| 1602 | public: |
| 1603 | bool sleep(jlong millis); |
| 1604 | |
| 1605 | // java.lang.Thread interruption support |
| 1606 | void interrupt(); |
| 1607 | bool is_interrupted(bool clear_interrupted); |
| 1608 | |
| 1609 | static OopStorage* thread_oop_storage(); |
| 1610 | |
| 1611 | static void verify_cross_modify_fence_failure(JavaThread *thread) PRODUCT_RETURN; |
| 1612 | |
| 1613 | // Helper function to create the java.lang.Thread object for a |
| 1614 | // VM-internal thread. The thread will have the given name, be |
| 1615 | // part of the System ThreadGroup and if is_visible is true will be |
| 1616 | // discoverable via the system ThreadGroup. |
| 1617 | static Handle create_system_thread_object(const char* name, bool is_visible, TRAPSJavaThread* __the_thread__); |
| 1618 | |
| 1619 | // Helper function to start a VM-internal daemon thread. |
| 1620 | // E.g. ServiceThread, NotificationThread, CompilerThread etc. |
| 1621 | static void start_internal_daemon(JavaThread* current, JavaThread* target, |
| 1622 | Handle thread_oop, ThreadPriority prio); |
| 1623 | |
| 1624 | // Helper function to do vm_exit_on_initialization for osthread |
| 1625 | // resource allocation failure. |
| 1626 | static void vm_exit_on_osthread_failure(JavaThread* thread); |
| 1627 | }; |
| 1628 | |
| 1629 | inline JavaThread* JavaThread::current_or_null() { |
| 1630 | Thread* current = Thread::current_or_null(); |
| 1631 | return current != nullptr ? JavaThread::cast(current) : nullptr; |
| 1632 | } |
| 1633 | |
| 1634 | // The active thread queue. It also keeps track of the current used |
| 1635 | // thread priorities. |
| 1636 | class Threads: AllStatic { |
| 1637 | friend class VMStructs; |
| 1638 | private: |
| 1639 | static int _number_of_threads; |
| 1640 | static int _number_of_non_daemon_threads; |
| 1641 | static int _return_code; |
| 1642 | static uintx _thread_claim_token; |
| 1643 | #ifdef ASSERT1 |
| 1644 | static bool _vm_complete; |
| 1645 | #endif |
| 1646 | |
| 1647 | static void initialize_java_lang_classes(JavaThread* main_thread, TRAPSJavaThread* __the_thread__); |
| 1648 | static void initialize_jsr292_core_classes(TRAPSJavaThread* __the_thread__); |
| 1649 | |
| 1650 | public: |
| 1651 | // Thread management |
| 1652 | // force_daemon is a concession to JNI, where we may need to add a |
| 1653 | // thread to the thread list before allocating its thread object |
| 1654 | static void add(JavaThread* p, bool force_daemon = false); |
| 1655 | static void remove(JavaThread* p, bool is_daemon); |
| 1656 | static void non_java_threads_do(ThreadClosure* tc); |
| 1657 | static void java_threads_do(ThreadClosure* tc); |
| 1658 | static void java_threads_and_vm_thread_do(ThreadClosure* tc); |
| 1659 | static void threads_do(ThreadClosure* tc); |
| 1660 | static void possibly_parallel_threads_do(bool is_par, ThreadClosure* tc); |
| 1661 | |
| 1662 | // Initializes the vm and creates the vm thread |
| 1663 | static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); |
| 1664 | static void convert_vm_init_libraries_to_agents(); |
| 1665 | static void create_vm_init_libraries(); |
| 1666 | static void create_vm_init_agents(); |
| 1667 | static void shutdown_vm_agents(); |
| 1668 | static void destroy_vm(); |
| 1669 | // Supported VM versions via JNI |
| 1670 | // Includes JNI_VERSION_1_1 |
| 1671 | static jboolean is_supported_jni_version_including_1_1(jint version); |
| 1672 | // Does not include JNI_VERSION_1_1 |
| 1673 | static jboolean is_supported_jni_version(jint version); |
| 1674 | |
| 1675 | // The "thread claim token" provides a way for threads to be claimed |
| 1676 | // by parallel worker tasks. |
| 1677 | // |
| 1678 | // Each thread contains a "token" field. A task will claim the |
| 1679 | // thread only if its token is different from the global token, |
| 1680 | // which is updated by calling change_thread_claim_token(). When |
| 1681 | // a thread is claimed, it's token is set to the global token value |
| 1682 | // so other threads in the same iteration pass won't claim it. |
| 1683 | // |
| 1684 | // For this to work change_thread_claim_token() needs to be called |
| 1685 | // exactly once in sequential code before starting parallel tasks |
| 1686 | // that should claim threads. |
| 1687 | // |
| 1688 | // New threads get their token set to 0 and change_thread_claim_token() |
| 1689 | // never sets the global token to 0. |
| 1690 | static uintx thread_claim_token() { return _thread_claim_token; } |
| 1691 | static void change_thread_claim_token(); |
| 1692 | static void assert_all_threads_claimed() NOT_DEBUG_RETURN; |
| 1693 | |
| 1694 | // Apply "f->do_oop" to all root oops in all threads. |
| 1695 | // This version may only be called by sequential code. |
| 1696 | static void oops_do(OopClosure* f, CodeBlobClosure* cf); |
| 1697 | // This version may be called by sequential or parallel code. |
| 1698 | static void possibly_parallel_oops_do(bool is_par, OopClosure* f, CodeBlobClosure* cf); |
| 1699 | |
| 1700 | // RedefineClasses support |
| 1701 | static void metadata_do(MetadataClosure* f); |
| 1702 | static void metadata_handles_do(void f(Metadata*)); |
| 1703 | |
| 1704 | #ifdef ASSERT1 |
| 1705 | static bool is_vm_complete() { return _vm_complete; } |
| 1706 | #endif // ASSERT |
| 1707 | |
| 1708 | // Verification |
| 1709 | static void verify(); |
| 1710 | static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks, bool print_extended_info); |
| 1711 | static void print(bool print_stacks, bool internal_format) { |
| 1712 | // this function is only used by debug.cpp |
| 1713 | print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */, false /* simple format */); |
| 1714 | } |
| 1715 | static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); |
| 1716 | static void print_on_error(Thread* this_thread, outputStream* st, Thread* current, char* buf, |
| 1717 | int buflen, bool* found_current); |
| 1718 | static void print_threads_compiling(outputStream* st, char* buf, int buflen, bool short_form = false); |
| 1719 | |
| 1720 | // Get Java threads that are waiting to enter a monitor. |
| 1721 | static GrowableArray<JavaThread*>* get_pending_threads(ThreadsList * t_list, |
| 1722 | int count, address monitor); |
| 1723 | |
| 1724 | // Get owning Java thread from the monitor's owner field. |
| 1725 | static JavaThread *owning_thread_from_monitor_owner(ThreadsList * t_list, |
| 1726 | address owner); |
| 1727 | |
| 1728 | // Number of threads on the active threads list |
| 1729 | static int number_of_threads() { return _number_of_threads; } |
| 1730 | // Number of non-daemon threads on the active threads list |
| 1731 | static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } |
| 1732 | |
| 1733 | // Deoptimizes all frames tied to marked nmethods |
| 1734 | static void deoptimized_wrt_marked_nmethods(); |
| 1735 | |
| 1736 | struct Test; // For private gtest access. |
| 1737 | }; |
| 1738 | |
| 1739 | class UnlockFlagSaver { |
| 1740 | private: |
| 1741 | JavaThread* _thread; |
| 1742 | bool _do_not_unlock; |
| 1743 | public: |
| 1744 | UnlockFlagSaver(JavaThread* t) { |
| 1745 | _thread = t; |
| 1746 | _do_not_unlock = t->do_not_unlock_if_synchronized(); |
| 1747 | t->set_do_not_unlock_if_synchronized(false); |
| 1748 | } |
| 1749 | ~UnlockFlagSaver() { |
| 1750 | _thread->set_do_not_unlock_if_synchronized(_do_not_unlock); |
| 1751 | } |
| 1752 | }; |
| 1753 | |
| 1754 | class JNIHandleMark : public StackObj { |
| 1755 | JavaThread* _thread; |
| 1756 | public: |
| 1757 | JNIHandleMark(JavaThread* thread) : _thread(thread) { |
| 1758 | thread->push_jni_handle_block(); |
| 1759 | } |
| 1760 | ~JNIHandleMark() { _thread->pop_jni_handle_block(); } |
| 1761 | }; |
| 1762 | |
| 1763 | #endif // SHARE_RUNTIME_THREAD_HPP |
| 1 | /* |
| 2 | * Copyright (c) 2002, 2020, Oracle and/or its affiliates. All rights reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| 13 | * accompanied this code). |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License version |
| 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | * |
| 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| 20 | * or visit www.oracle.com if you need additional information or have any |
| 21 | * questions. |
| 22 | * |
| 23 | */ |
| 24 | |
| 25 | #ifndef SHARE_RUNTIME_JAVAFRAMEANCHOR_HPP |
| 26 | #define SHARE_RUNTIME_JAVAFRAMEANCHOR_HPP |
| 27 | |
| 28 | #include "runtime/orderAccess.hpp" |
| 29 | #include "utilities/globalDefinitions.hpp" |
| 30 | #include "utilities/macros.hpp" |
| 31 | |
| 32 | // |
| 33 | // An object for encapsulating the machine/os dependent part of a JavaThread frame state |
| 34 | // |
| 35 | class JavaThread; |
| 36 | class MacroAssembler; |
| 37 | class ProgrammableUpcallHandler; |
| 38 | class ZeroFrame; |
| 39 | |
| 40 | class JavaFrameAnchor { |
| 41 | // Too many friends... |
| 42 | friend class CallNativeDirectNode; |
| 43 | friend class OptoRuntime; |
| 44 | friend class Runtime1; |
| 45 | friend class StubAssembler; |
| 46 | friend class CallRuntimeDirectNode; |
| 47 | friend class MacroAssembler; |
| 48 | friend class LIR_Assembler; |
| 49 | friend class GraphKit; |
| 50 | friend class StubGenerator; |
| 51 | friend class JavaThread; |
| 52 | friend class frame; |
| 53 | friend class VMStructs; |
| 54 | friend class JVMCIVMStructs; |
| 55 | friend class BytecodeInterpreter; |
| 56 | friend class JavaCallWrapper; |
| 57 | friend class ProgrammableUpcallHandler; |
| 58 | |
| 59 | private: |
| 60 | // |
| 61 | // Whenever _last_Java_sp != NULL other anchor fields MUST be valid! |
| 62 | // The stack may not be walkable [check with walkable() ] but the values must be valid. |
| 63 | // The profiler apparently depends on this. |
| 64 | // |
| 65 | intptr_t* volatile _last_Java_sp; |
| 66 | |
| 67 | // Whenever we call from Java to native we can not be assured that the return |
| 68 | // address that composes the last_Java_frame will be in an accessible location |
| 69 | // so calls from Java to native store that pc (or one good enough to locate |
| 70 | // the oopmap) in the frame anchor. Since the frames that call from Java to |
| 71 | // native are never deoptimized we never need to patch the pc and so this |
| 72 | // is acceptable. |
| 73 | volatile address _last_Java_pc; |
| 74 | |
| 75 | // tells whether the last Java frame is set |
| 76 | // It is important that when last_Java_sp != NULL that the rest of the frame |
| 77 | // anchor (including platform specific) all be valid. |
| 78 | |
| 79 | bool has_last_Java_frame() const { return _last_Java_sp != NULL__null; } |
| 80 | // This is very dangerous unless sp == NULL |
| 81 | // Invalidate the anchor so that has_last_frame is false |
| 82 | // and no one should look at the other fields. |
| 83 | void zap(void) { _last_Java_sp = NULL__null; } |
| 84 | |
| 85 | #include CPU_HEADER(javaFrameAnchor)"javaFrameAnchor_x86.hpp" |
| 86 | |
| 87 | public: |
| 88 | JavaFrameAnchor() { clear(); } |
| 89 | JavaFrameAnchor(JavaFrameAnchor *src) { copy(src); } |
| 90 | |
| 91 | // Assembly stub generation helpers |
| 92 | |
| 93 | static ByteSize last_Java_sp_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_sp)in_ByteSize((int)(size_t)((intx)&(((JavaFrameAnchor*)16)-> _last_Java_sp) - 16)); } |
| 94 | static ByteSize last_Java_pc_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_pc)in_ByteSize((int)(size_t)((intx)&(((JavaFrameAnchor*)16)-> _last_Java_pc) - 16)); } |
| 95 | |
| 96 | }; |
| 97 | |
| 98 | #endif // SHARE_RUNTIME_JAVAFRAMEANCHOR_HPP |
| 1 | /* |
| 2 | * Copyright (c) 2020, 2021, Oracle and/or its affiliates. All rights reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| 13 | * accompanied this code). |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License version |
| 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | * |
| 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| 20 | * or visit www.oracle.com if you need additional information or have any |
| 21 | * questions. |
| 22 | * |
| 23 | */ |
| 24 | |
| 25 | #ifndef SHARE_RUNTIME_STACKWATERMARK_INLINE_HPP |
| 26 | #define SHARE_RUNTIME_STACKWATERMARK_INLINE_HPP |
| 27 | |
| 28 | #include "runtime/stackWatermark.hpp" |
| 29 | |
| 30 | #include "code/nmethod.hpp" |
| 31 | #include "runtime/registerMap.hpp" |
| 32 | #include "runtime/thread.hpp" |
| 33 | |
| 34 | static inline bool is_above_watermark(uintptr_t sp, uintptr_t watermark) { |
| 35 | if (watermark == 0) { |
| 36 | return false; |
| 37 | } |
| 38 | return sp > watermark; |
| 39 | } |
| 40 | |
| 41 | // Returns true for frames where stack watermark barriers have been inserted. |
| 42 | // This function may return false negatives, but may never return true if a |
| 43 | // frame has no barrier. |
| 44 | inline bool StackWatermark::has_barrier(const frame& f) { |
| 45 | if (f.is_interpreted_frame()) { |
| 46 | return true; |
| 47 | } |
| 48 | if (f.is_compiled_frame()) { |
| 49 | nmethod* nm = f.cb()->as_nmethod(); |
| 50 | if (nm->is_compiled_by_c1() || nm->is_compiled_by_c2()) { |
| 51 | return true; |
| 52 | } |
| 53 | if (nm->is_native_method()) { |
| 54 | return true; |
| 55 | } |
| 56 | } |
| 57 | return false; |
| 58 | } |
| 59 | |
| 60 | inline bool StackWatermark::processing_started(uint32_t state) const { |
| 61 | return StackWatermarkState::epoch(state) == epoch_id(); |
| 62 | } |
| 63 | |
| 64 | inline bool StackWatermark::processing_completed(uint32_t state) const { |
| 65 | assert(processing_started(state), "Check is only valid if processing has been started")do { if (!(processing_started(state))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/stackWatermark.inline.hpp" , 65, "assert(" "processing_started(state)" ") failed", "Check is only valid if processing has been started" ); ::breakpoint(); } } while (0); |
| 66 | return StackWatermarkState::is_done(state); |
| 67 | } |
| 68 | |
| 69 | inline void StackWatermark::ensure_safe(const frame& f) { |
| 70 | assert(processing_started(), "Processing should already have started")do { if (!(processing_started())) { (*g_assert_poison) = 'X'; ; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/stackWatermark.inline.hpp" , 70, "assert(" "processing_started()" ") failed", "Processing should already have started" ); ::breakpoint(); } } while (0); |
| 71 | |
| 72 | if (processing_completed_acquire()) { |
| 73 | return; |
| 74 | } |
| 75 | |
| 76 | uintptr_t f_fp = reinterpret_cast<uintptr_t>(f.real_fp()); |
| 77 | |
| 78 | if (is_above_watermark(f_fp, watermark())) { |
| 79 | process_one(); |
| 80 | } |
| 81 | |
| 82 | assert_is_frame_safe(f); |
| 83 | } |
| 84 | |
| 85 | inline void StackWatermark::before_unwind() { |
| 86 | frame f = _jt->last_frame(); |
| 87 | |
| 88 | // Skip any stub frames etc up until the frame that triggered before_unwind(). |
| 89 | RegisterMap map(_jt, false /* update_map */, false /* process_frames */); |
| 90 | if (f.is_safepoint_blob_frame() || f.is_runtime_frame()) { |
| 91 | f = f.sender(&map); |
| 92 | } |
| 93 | |
| 94 | assert_is_frame_safe(f); |
| 95 | assert(!f.is_runtime_frame(), "should have skipped all runtime stubs")do { if (!(!f.is_runtime_frame())) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/stackWatermark.inline.hpp" , 95, "assert(" "!f.is_runtime_frame()" ") failed", "should have skipped all runtime stubs" ); ::breakpoint(); } } while (0); |
| 96 | |
| 97 | // before_unwind() potentially exposes a new frame. The new exposed frame is |
| 98 | // always the caller of the top frame. |
| 99 | if (!f.is_first_frame()) { |
| 100 | f = f.sender(&map); |
| 101 | ensure_safe(f); |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | inline void StackWatermark::after_unwind() { |
| 106 | frame f = _jt->last_frame(); |
| 107 | |
| 108 | if (f.is_safepoint_blob_frame() || f.is_runtime_frame()) { |
| 109 | // Skip safepoint blob. |
| 110 | RegisterMap map(_jt, false /* update_map */, false /* process_frames */); |
| 111 | f = f.sender(&map); |
| 112 | } |
| 113 | |
| 114 | assert(!f.is_runtime_frame(), "should have skipped all runtime stubs")do { if (!(!f.is_runtime_frame())) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/runtime/stackWatermark.inline.hpp" , 114, "assert(" "!f.is_runtime_frame()" ") failed", "should have skipped all runtime stubs" ); ::breakpoint(); } } while (0); |
| 115 | |
| 116 | // after_unwind() potentially exposes the top frame. |
| 117 | ensure_safe(f); |
| 118 | } |
| 119 | |
| 120 | inline void StackWatermark::on_iteration(const frame& f) { |
| 121 | if (process_on_iteration()) { |
| 122 | ensure_safe(f); |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | #endif // SHARE_RUNTIME_STACKWATERMARK_INLINE_HPP |