| /* |
| * Copyright (c) 1997, 2016, 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/shared/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 "runtime/mutexLocker.hpp" |
| #include "runtime/stubRoutines.hpp" |
| |
| 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_compiled(ic_site()), ic_site()); |
| assert(CodeCache::find_compiled(ic->instruction_address()) != NULL, "inline cache in non-compiled?"); |
| |
| 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, p2i(_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_ICBufferFull ibf; |
| VMThread::execute(&ibf); |
| // 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, |
| p2i(ic->instruction_address()), p2i(entry), p2i(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", p2i(icholder)); |
| } |
| } |