src/hotspot/cpu/x86/c2_CodeStubs_x86.cpp

/*
 * Copyright (c) 2020, 2023, 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
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#include "precompiled.hpp"
#include "opto/c2_MacroAssembler.hpp"
#include "opto/c2_CodeStubs.hpp"
#include "runtime/objectMonitor.hpp"
#include "runtime/sharedRuntime.hpp"
#include "runtime/stubRoutines.hpp"

#define __ masm.

int C2SafepointPollStub::max_size() const {
  return 33;
}

void C2SafepointPollStub::emit(C2_MacroAssembler& masm) {
  assert(SharedRuntime::polling_page_return_handler_blob() != nullptr,
         "polling page return stub not created yet");
  address stub = SharedRuntime::polling_page_return_handler_blob()->entry_point();

  RuntimeAddress callback_addr(stub);

  __ bind(entry());
  InternalAddress safepoint_pc(masm.pc() - masm.offset() + _safepoint_offset);
#ifdef _LP64
  __ lea(rscratch1, safepoint_pc);
  __ movptr(Address(r15_thread, JavaThread::saved_exception_pc_offset()), rscratch1);
#else
  const Register tmp1 = rcx;
  const Register tmp2 = rdx;
  __ push(tmp1);
  __ push(tmp2);

  __ lea(tmp1, safepoint_pc);
  __ get_thread(tmp2);
  __ movptr(Address(tmp2, JavaThread::saved_exception_pc_offset()), tmp1);

  __ pop(tmp2);
  __ pop(tmp1);
#endif
  __ jump(callback_addr);
}

int C2EntryBarrierStub::max_size() const {
  return 10;
}

void C2EntryBarrierStub::emit(C2_MacroAssembler& masm) {
  __ bind(entry());
  __ call(RuntimeAddress(StubRoutines::x86::method_entry_barrier()));
  __ jmp(continuation(), false /* maybe_short */);
}

#ifdef _LP64
int C2HandleAnonOMOwnerStub::max_size() const {
  // Max size of stub has been determined by testing with 0, in which case
  // C2CodeStubList::emit() will throw an assertion and report the actual size that
  // is needed.
  return DEBUG_ONLY(36) NOT_DEBUG(21);
}

void C2HandleAnonOMOwnerStub::emit(C2_MacroAssembler& masm) {
  __ bind(entry());
  Register mon = monitor();
  Register t = tmp();
  __ movptr(Address(mon, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner)), r15_thread);
  __ subl(Address(r15_thread, JavaThread::lock_stack_top_offset()), oopSize);
#ifdef ASSERT
  __ movl(t, Address(r15_thread, JavaThread::lock_stack_top_offset()));
  __ movptr(Address(r15_thread, t), 0);
#endif
  __ jmp(continuation());
}
#endif

#undef __