88 lines
3.1 KiB
C++
88 lines
3.1 KiB
C++
/*
|
|
* Copyright (c) 2018, 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/nmethod.hpp"
|
|
#include "gc/shared/barrierSet.hpp"
|
|
#include "gc/shared/barrierSetNMethod.hpp"
|
|
#include "logging/log.hpp"
|
|
#include "runtime/thread.hpp"
|
|
#include "utilities/debug.hpp"
|
|
|
|
int BarrierSetNMethod::disarmed_value() const {
|
|
char* disarmed_addr = reinterpret_cast<char*>(Thread::current());
|
|
disarmed_addr += in_bytes(thread_disarmed_offset());
|
|
return *reinterpret_cast<int*>(disarmed_addr);
|
|
}
|
|
|
|
bool BarrierSetNMethod::supports_entry_barrier(nmethod* nm) {
|
|
if (nm->method()->is_method_handle_intrinsic()) {
|
|
return false;
|
|
}
|
|
|
|
if (!nm->is_native_method() && !nm->is_compiled_by_c2() && !nm->is_compiled_by_c1()) {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
int BarrierSetNMethod::nmethod_stub_entry_barrier(address* return_address_ptr) {
|
|
address return_address = *return_address_ptr;
|
|
CodeBlob* cb = CodeCache::find_blob(return_address);
|
|
assert(cb != NULL, "invariant");
|
|
|
|
nmethod* nm = cb->as_nmethod();
|
|
BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
|
|
|
|
if (!bs_nm->is_armed(nm)) {
|
|
return 0;
|
|
}
|
|
|
|
assert(!nm->is_osr_method(), "Should not reach here");
|
|
// Called upon first entry after being armed
|
|
bool may_enter = bs_nm->nmethod_entry_barrier(nm);
|
|
if (!may_enter) {
|
|
log_trace(nmethod, barrier)("Deoptimizing nmethod: " PTR_FORMAT, p2i(nm));
|
|
bs_nm->deoptimize(nm, return_address_ptr);
|
|
}
|
|
return may_enter ? 0 : 1;
|
|
}
|
|
|
|
bool BarrierSetNMethod::nmethod_osr_entry_barrier(nmethod* nm) {
|
|
// This check depends on the invariant that all nmethods that are deoptimized / made not entrant
|
|
// are NOT disarmed.
|
|
// This invariant is important because a method can be deoptimized after the method have been
|
|
// resolved / looked up by OSR by another thread. By not deoptimizing them we guarantee that
|
|
// a deoptimized method will always hit the barrier and come to the same conclusion - deoptimize
|
|
if (!is_armed(nm)) {
|
|
return true;
|
|
}
|
|
|
|
assert(nm->is_osr_method(), "Should not reach here");
|
|
log_trace(nmethod, barrier)("Running osr nmethod entry barrier: " PTR_FORMAT, p2i(nm));
|
|
return nmethod_entry_barrier(nm);
|
|
}
|