Mercurial > hg > graal-compiler
view src/share/vm/code/icBuffer.cpp @ 20279:870c03421152
8049426: Minor cleanups after G1 class unloading
Reviewed-by: stefank, brutisso
author | ehelin |
---|---|
date | Wed, 09 Jul 2014 16:44:30 +0200 |
parents | 78bbf4d43a14 |
children | 52b4284cb496 |
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/* * 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); } }