jdk8-mips64-public/hotspot: comparison src/share/vm/code/icBuffer.cpp

--1:000000000000
+:f90c822e73f8
+/*
+* Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
+* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+*
+* This code is free software; you can redistribute it and/or modify it
+* under the terms of the GNU General Public License version 2 only, as
+* published by the Free Software Foundation.
+*
+* This code is distributed in the hope that it will be useful, but WITHOUT
+* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+* version 2 for more details (a copy is included in the LICENSE file that
+* accompanied this code).
+*
+* You should have received a copy of the GNU General Public License version
+* 2 along with this work; if not, write to the Free Software Foundation,
+* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+*
+* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+* or visit www.oracle.com if you need additional information or have any
+* questions.
+*
+*/
+#include "precompiled.hpp"
+#include "code/codeCache.hpp"
+#include "code/compiledIC.hpp"
+#include "code/icBuffer.hpp"
+#include "code/nmethod.hpp"
+#include "code/scopeDesc.hpp"
+#include "gc_interface/collectedHeap.inline.hpp"
+#include "interpreter/interpreter.hpp"
+#include "interpreter/linkResolver.hpp"
+#include "memory/resourceArea.hpp"
+#include "memory/universe.inline.hpp"
+#include "oops/method.hpp"
+#include "oops/oop.inline.hpp"
+#include "oops/oop.inline2.hpp"
+#include "runtime/mutexLocker.hpp"
+#include "runtime/stubRoutines.hpp"
+PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
+DEF_STUB_INTERFACE(ICStub);
+StubQueue* InlineCacheBuffer::_buffer    = NULL;
+ICStub*    InlineCacheBuffer::_next_stub = NULL;
+CompiledICHolder* InlineCacheBuffer::_pending_released = NULL;
+int InlineCacheBuffer::_pending_count = 0;
+void ICStub::finalize() {
+if (!is_empty()) {
+ResourceMark rm;
+CompiledIC *ic = CompiledIC_at(CodeCache::find_nmethod(ic_site()), ic_site());
+assert(CodeCache::find_nmethod(ic->instruction_address()) != NULL, "inline cache in non-nmethod?");
+assert(this == ICStub_from_destination_address(ic->stub_address()), "wrong owner of ic buffer");
+ic->set_ic_destination_and_value(destination(), cached_value());
+}
+}
+address ICStub::destination() const {
+return InlineCacheBuffer::ic_buffer_entry_point(code_begin());
+}
+void* ICStub::cached_value() const {
+return InlineCacheBuffer::ic_buffer_cached_value(code_begin());
+}
+void ICStub::set_stub(CompiledIC *ic, void* cached_val, address dest_addr) {
+// We cannot store a pointer to the 'ic' object, since it is resource allocated. Instead we
+// store the location of the inline cache. Then we have enough information recreate the CompiledIC
+// object when we need to remove the stub.
+_ic_site = ic->instruction_address();
+// Assemble new stub
+InlineCacheBuffer::assemble_ic_buffer_code(code_begin(), cached_val, dest_addr);
+assert(destination() == dest_addr,   "can recover destination");
+assert(cached_value() == cached_val, "can recover destination");
+}
+void ICStub::clear() {
+if (CompiledIC::is_icholder_entry(destination())) {
+InlineCacheBuffer::queue_for_release((CompiledICHolder*)cached_value());
+}
+_ic_site = NULL;
+}
+#ifndef PRODUCT
+// anybody calling to this stub will trap
+void ICStub::verify() {
+}
+void ICStub::print() {
+tty->print_cr("ICStub: site: " INTPTR_FORMAT, _ic_site);
+}
+#endif
+//-----------------------------------------------------------------------------------------------
+// Implementation of InlineCacheBuffer
+void InlineCacheBuffer::init_next_stub() {
+ICStub* ic_stub = (ICStub*)buffer()->request_committed (ic_stub_code_size());
+assert (ic_stub != NULL, "no room for a single stub");
+set_next_stub(ic_stub);
+}
+void InlineCacheBuffer::initialize() {
+if (_buffer != NULL) return; // already initialized
+_buffer = new StubQueue(new ICStubInterface, 10*K, InlineCacheBuffer_lock, "InlineCacheBuffer");
+assert (_buffer != NULL, "cannot allocate InlineCacheBuffer");
+init_next_stub();
+}
+ICStub* InlineCacheBuffer::new_ic_stub() {
+while (true) {
+ICStub* ic_stub = (ICStub*)buffer()->request_committed(ic_stub_code_size());
+if (ic_stub != NULL) {
+return ic_stub;
+}
+// we ran out of inline cache buffer space; must enter safepoint.
+// We do this by forcing a safepoint
+EXCEPTION_MARK;
+VM_ForceSafepoint vfs;
+VMThread::execute(&vfs);
+// We could potential get an async. exception at this point.
+// In that case we will rethrow it to ourselvs.
+if (HAS_PENDING_EXCEPTION) {
+oop exception = PENDING_EXCEPTION;
+CLEAR_PENDING_EXCEPTION;
+Thread::send_async_exception(JavaThread::current()->threadObj(), exception);
+}
+}
+ShouldNotReachHere();
+return NULL;
+}
+void InlineCacheBuffer::update_inline_caches() {
+if (buffer()->number_of_stubs() > 1) {
+if (TraceICBuffer) {
+tty->print_cr("[updating inline caches with %d stubs]", buffer()->number_of_stubs());
+}
+buffer()->remove_all();
+init_next_stub();
+}
+release_pending_icholders();
+}
+bool InlineCacheBuffer::contains(address instruction_address) {
+return buffer()->contains(instruction_address);
+}
+bool InlineCacheBuffer::is_empty() {
+return buffer()->number_of_stubs() == 1;    // always has sentinel
+}
+void InlineCacheBuffer_init() {
+InlineCacheBuffer::initialize();
+}
+void InlineCacheBuffer::create_transition_stub(CompiledIC *ic, void* cached_value, address entry) {
+assert(!SafepointSynchronize::is_at_safepoint(), "should not be called during a safepoint");
+assert (CompiledIC_lock->is_locked(), "");
+if (TraceICBuffer) {
+tty->print_cr("  create transition stub for " INTPTR_FORMAT " destination " INTPTR_FORMAT " cached value " INTPTR_FORMAT,
+ic->instruction_address(), entry, cached_value);
+}
+// If an transition stub is already associate with the inline cache, then we remove the association.
+if (ic->is_in_transition_state()) {
+ICStub* old_stub = ICStub_from_destination_address(ic->stub_address());
+old_stub->clear();
+}
+// allocate and initialize new "out-of-line" inline-cache
+ICStub* ic_stub = get_next_stub();
+ic_stub->set_stub(ic, cached_value, entry);
+// Update inline cache in nmethod to point to new "out-of-line" allocated inline cache
+ic->set_ic_destination(ic_stub);
+set_next_stub(new_ic_stub()); // can cause safepoint synchronization
+}
+address InlineCacheBuffer::ic_destination_for(CompiledIC *ic) {
+ICStub* stub = ICStub_from_destination_address(ic->stub_address());
+return stub->destination();
+}
+void* InlineCacheBuffer::cached_value_for(CompiledIC *ic) {
+ICStub* stub = ICStub_from_destination_address(ic->stub_address());
+return stub->cached_value();
+}
+// Free CompiledICHolder*s that are no longer in use
+void InlineCacheBuffer::release_pending_icholders() {
+assert(SafepointSynchronize::is_at_safepoint(), "should only be called during a safepoint");
+CompiledICHolder* holder = _pending_released;
+_pending_released = NULL;
+while (holder != NULL) {
+CompiledICHolder* next = holder->next();
+delete holder;
+holder = next;
+_pending_count--;
+}
+assert(_pending_count == 0, "wrong count");
+}
+// Enqueue this icholder for release during the next safepoint.  It's
+// not safe to free them until them since they might be visible to
+// another thread.
+void InlineCacheBuffer::queue_for_release(CompiledICHolder* icholder) {
+MutexLockerEx mex(InlineCacheBuffer_lock);
+icholder->set_next(_pending_released);
+_pending_released = icholder;
+_pending_count++;
+if (TraceICBuffer) {
+tty->print_cr("enqueueing icholder " INTPTR_FORMAT " to be freed", icholder);
+}
+}

Mercurial > jdk8-mips64-public > hotspot / file comparison

comparison: src/share/vm/code/icBuffer.cpp

src/share/vm/code/icBuffer.cpp