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/*
* Copyright (c) 1997, 2006, 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 "incls/_precompiled.incl"
#include "incls/_icBuffer.cpp.incl"
DEF_STUB_INTERFACE(ICStub);
StubQueue* InlineCacheBuffer::_buffer = NULL;
ICStub* InlineCacheBuffer::_next_stub = NULL;
void ICStub::finalize() {
if (!is_empty()) {
ResourceMark rm;
CompiledIC *ic = CompiledIC_at(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_cached_oop(cached_oop());
ic->set_ic_destination(destination());
}
}
address ICStub::destination() const {
return InlineCacheBuffer::ic_buffer_entry_point(code_begin());
}
oop ICStub::cached_oop() const {
return InlineCacheBuffer::ic_buffer_cached_oop(code_begin());
}
void ICStub::set_stub(CompiledIC *ic, oop cached_value, 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_value, dest_addr);
assert(destination() == dest_addr, "can recover destination");
assert(cached_oop() == cached_value, "can recover destination");
}
void ICStub::clear() {
_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();
}
}
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, oop cached_oop, address entry) {
assert(!SafepointSynchronize::is_at_safepoint(), "should not be called during a safepoint");
assert (CompiledIC_lock->is_locked(), "");
assert(cached_oop == NULL || cached_oop->is_perm(), "must belong to perm. space");
if (TraceICBuffer) { tty->print_cr(" create transition stub for " INTPTR_FORMAT, ic->instruction_address()); }
// 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_oop, entry);
// Update inline cache in nmethod to point to new "out-of-line" allocated inline cache
ic->set_ic_destination(ic_stub->code_begin());
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();
}
oop InlineCacheBuffer::cached_oop_for(CompiledIC *ic) {
ICStub* stub = ICStub_from_destination_address(ic->stub_address());
return stub->cached_oop();
}
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