author | iignatyev |
Mon, 10 Dec 2018 11:04:55 -0800 | |
changeset 52934 | 8deeb7bba516 |
parent 51467 | 12997ebbc0d8 |
child 53582 | 881c5fbeb849 |
permissions | -rw-r--r-- |
50113 | 1 |
/* |
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* Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#include "precompiled.hpp" |
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#include "jni.h" |
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#include "classfile/symbolTable.hpp" |
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#include "classfile/systemDictionary.hpp" |
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#include "classfile/vmSymbols.hpp" |
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#include "jfr/jni/jfrJavaSupport.hpp" |
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#include "jfr/recorder/storage/jfrStorage.hpp" |
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#include "jfr/support/jfrThreadId.hpp" |
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#include "jfr/utilities/jfrTypes.hpp" |
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#include "jfr/writers/jfrJavaEventWriter.hpp" |
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#include "oops/instanceKlass.hpp" |
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#include "oops/oop.inline.hpp" |
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51467
12997ebbc0d8
8209647: constantPoolHandle::constantPoolHandle(ConstantPool*) when precompiled header is disabled
iklam
parents:
50113
diff
changeset
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#include "runtime/fieldDescriptor.inline.hpp" |
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#include "runtime/handles.hpp" |
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#include "runtime/jniHandles.inline.hpp" |
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#include "runtime/thread.inline.hpp" |
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static int start_pos_offset = invalid_offset; |
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static int start_pos_address_offset = invalid_offset; |
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static int current_pos_offset = invalid_offset; |
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static int max_pos_offset = invalid_offset; |
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static int max_event_size_offset = invalid_offset; |
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static int notified_offset = invalid_offset; |
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static int thread_id_offset = invalid_offset; |
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static int valid_offset = invalid_offset; |
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static bool find_field(InstanceKlass* ik, |
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Symbol* name_symbol, |
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Symbol* signature_symbol, |
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fieldDescriptor* fd, |
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bool is_static = false, |
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bool allow_super = false) { |
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if (allow_super || is_static) { |
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return ik->find_field(name_symbol, signature_symbol, is_static, fd) != NULL; |
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} else { |
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return ik->find_local_field(name_symbol, signature_symbol, fd); |
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} |
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} |
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static void compute_offset(int &dest_offset, |
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Klass* klass, |
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Symbol* name_symbol, |
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Symbol* signature_symbol, |
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bool is_static = false, bool allow_super = false) { |
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fieldDescriptor fd; |
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InstanceKlass* ik = InstanceKlass::cast(klass); |
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if (!find_field(ik, name_symbol, signature_symbol, &fd, is_static, allow_super)) { |
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assert(false, "invariant"); |
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} |
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dest_offset = fd.offset(); |
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} |
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static bool setup_event_writer_offsets(TRAPS) { |
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const char class_name[] = "jdk/jfr/internal/EventWriter"; |
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Symbol* const k_sym = SymbolTable::lookup(class_name, sizeof class_name - 1, CHECK_false); |
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assert(k_sym != NULL, "invariant"); |
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Klass* klass = SystemDictionary::resolve_or_fail(k_sym, true, CHECK_false); |
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assert(klass != NULL, "invariant"); |
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const char start_pos_name[] = "startPosition"; |
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Symbol* const start_pos_sym = SymbolTable::lookup(start_pos_name, sizeof start_pos_name - 1, CHECK_false); |
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assert(start_pos_sym != NULL, "invariant"); |
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assert(invalid_offset == start_pos_offset, "invariant"); |
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compute_offset(start_pos_offset, klass, start_pos_sym, vmSymbols::long_signature()); |
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assert(start_pos_offset != invalid_offset, "invariant"); |
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const char start_pos_address_name[] = "startPositionAddress"; |
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Symbol* const start_pos_address_sym = SymbolTable::lookup(start_pos_address_name, sizeof start_pos_address_name - 1, CHECK_false); |
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assert(start_pos_address_sym != NULL, "invariant"); |
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assert(invalid_offset == start_pos_address_offset, "invariant"); |
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compute_offset(start_pos_address_offset, klass, start_pos_address_sym, vmSymbols::long_signature()); |
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assert(start_pos_address_offset != invalid_offset, "invariant"); |
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const char event_pos_name[] = "currentPosition"; |
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Symbol* const event_pos_sym = SymbolTable::lookup(event_pos_name, sizeof event_pos_name - 1, CHECK_false); |
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assert(event_pos_sym != NULL, "invariant"); |
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assert(invalid_offset == current_pos_offset, "invariant"); |
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compute_offset(current_pos_offset, klass, event_pos_sym,vmSymbols::long_signature()); |
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assert(current_pos_offset != invalid_offset, "invariant"); |
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const char max_pos_name[] = "maxPosition"; |
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Symbol* const max_pos_sym = SymbolTable::lookup(max_pos_name, sizeof max_pos_name - 1, CHECK_false); |
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assert(max_pos_sym != NULL, "invariant"); |
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assert(invalid_offset == max_pos_offset, "invariant"); |
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compute_offset(max_pos_offset, klass, max_pos_sym, vmSymbols::long_signature()); |
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assert(max_pos_offset != invalid_offset, "invariant"); |
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const char max_event_size_name[] = "maxEventSize"; |
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Symbol* const max_event_size_sym = SymbolTable::lookup(max_event_size_name, sizeof max_event_size_name - 1, CHECK_false); |
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assert (max_event_size_sym != NULL, "invariant"); |
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assert(invalid_offset == max_event_size_offset, "invariant"); |
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compute_offset(max_event_size_offset, klass, max_event_size_sym, vmSymbols::int_signature()); |
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assert(max_event_size_offset != invalid_offset, "invariant"); |
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const char notified_name[] = "notified"; |
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Symbol* const notified_sym = SymbolTable::lookup(notified_name, sizeof notified_name - 1, CHECK_false); |
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assert (notified_sym != NULL, "invariant"); |
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assert(invalid_offset == notified_offset, "invariant"); |
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compute_offset(notified_offset, klass, notified_sym, vmSymbols::bool_signature()); |
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assert(notified_offset != invalid_offset, "invariant"); |
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const char valid_name[] = "valid"; |
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Symbol* const valid_sym = SymbolTable::lookup(valid_name, sizeof valid_name - 1, CHECK_false); |
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assert (valid_sym != NULL, "invariant"); |
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assert(invalid_offset == valid_offset, "invariant"); |
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compute_offset(valid_offset, klass, valid_sym, vmSymbols::bool_signature()); |
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assert(valid_offset != invalid_offset, "invariant"); |
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return true; |
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} |
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bool JfrJavaEventWriter::initialize() { |
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static bool initialized = false; |
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if (!initialized) { |
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Thread* thread = Thread::current(); |
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initialized = setup_event_writer_offsets(thread); |
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} |
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return initialized; |
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} |
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jboolean JfrJavaEventWriter::flush(jobject writer, jint used, jint requested, JavaThread* jt) { |
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DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(jt)); |
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assert(writer != NULL, "invariant"); |
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oop const w = JNIHandles::resolve_non_null(writer); |
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assert(w != NULL, "invariant"); |
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JfrBuffer* const current = jt->jfr_thread_local()->java_buffer(); |
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assert(current != NULL, "invariant"); |
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JfrBuffer* const buffer = JfrStorage::flush(current, used, requested, false, jt); |
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assert(buffer != NULL, "invariant"); |
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// "validity" is contextually defined here to mean |
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// that some memory location was provided that is |
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// large enough to accommodate the "requested size". |
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const bool is_valid = buffer->free_size() >= (size_t)(used + requested); |
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u1* const new_current_position = is_valid ? buffer->pos() + used : buffer->pos(); |
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w->long_field_put(start_pos_offset, (jlong)buffer->pos()); |
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w->long_field_put(current_pos_offset, (jlong)new_current_position); |
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// only update java writer if underlying memory changed |
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if (buffer != current) { |
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w->long_field_put(start_pos_address_offset, (jlong)buffer->pos_address()); |
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w->long_field_put(max_pos_offset, (jlong)buffer->end()); |
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} |
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if (!is_valid) { |
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// mark writer as invalid for this write attempt |
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w->release_bool_field_put(valid_offset, JNI_FALSE); |
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return JNI_FALSE; |
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} |
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// An exclusive use of a leased buffer is treated equivalent to |
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// holding a system resource. As such, it should be released as soon as possible. |
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// Returning true here signals that the thread will need to call flush again |
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// on EventWriter.endEvent() and that flush will return the lease. |
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return buffer->lease() ? JNI_TRUE : JNI_FALSE; |
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} |
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class JfrJavaEventWriterNotificationClosure : public ThreadClosure { |
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public: |
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void do_thread(Thread* t) { |
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if (t->is_Java_thread()) { |
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JfrJavaEventWriter::notify((JavaThread*)t); |
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} |
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} |
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}; |
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void JfrJavaEventWriter::notify() { |
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assert(SafepointSynchronize::is_at_safepoint(), "invariant"); |
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JfrJavaEventWriterNotificationClosure closure; |
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Threads::threads_do(&closure); |
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} |
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void JfrJavaEventWriter::notify(JavaThread* jt) { |
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assert(jt != NULL, "invariant"); |
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assert(SafepointSynchronize::is_at_safepoint(), "invariant"); |
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if (jt->jfr_thread_local()->has_java_event_writer()) { |
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oop buffer_writer = JNIHandles::resolve_non_null(jt->jfr_thread_local()->java_event_writer()); |
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assert(buffer_writer != NULL, "invariant"); |
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buffer_writer->release_bool_field_put(notified_offset, JNI_TRUE); |
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} |
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} |
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static jobject create_new_event_writer(JfrBuffer* buffer, TRAPS) { |
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assert(buffer != NULL, "invariant"); |
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DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(THREAD)); |
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HandleMark hm(THREAD); |
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static const char klass[] = "jdk/jfr/internal/EventWriter"; |
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static const char method[] = "<init>"; |
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static const char signature[] = "(JJJJZ)V"; |
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JavaValue result(T_OBJECT); |
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JfrJavaArguments args(&result, klass, method, signature, CHECK_NULL); |
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// parameters |
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args.push_long((jlong)buffer->pos()); |
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args.push_long((jlong)buffer->end()); |
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args.push_long((jlong)buffer->pos_address()); |
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args.push_long((jlong)JFR_THREAD_ID(THREAD)); |
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args.push_int((int)JNI_TRUE); |
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JfrJavaSupport::new_object_global_ref(&args, CHECK_NULL); |
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return result.get_jobject(); |
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} |
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jobject JfrJavaEventWriter::event_writer(Thread* t) { |
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DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(t)); |
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JfrThreadLocal* const tl = t->jfr_thread_local(); |
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assert(tl->shelved_buffer() == NULL, "invariant"); |
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return tl->java_event_writer(); |
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} |
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jobject JfrJavaEventWriter::new_event_writer(TRAPS) { |
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DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(THREAD)); |
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assert(event_writer(THREAD) == NULL, "invariant"); |
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JfrThreadLocal* const tl = THREAD->jfr_thread_local(); |
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assert(!tl->has_java_buffer(), "invariant"); |
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JfrBuffer* const buffer = tl->java_buffer(); |
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if (buffer == NULL) { |
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JfrJavaSupport::throw_out_of_memory_error("OOME for thread local buffer", THREAD); |
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return NULL; |
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} |
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jobject java_event_writer = create_new_event_writer(buffer, CHECK_NULL); |
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tl->set_java_event_writer(java_event_writer); |
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assert(tl->has_java_event_writer(), "invariant"); |
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return java_event_writer; |
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} |