/*

 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.

 * Copyright (c) 2016 SAP SE. 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 "asm/macroAssembler.inline.hpp"

#include "code/icBuffer.hpp"

#include "gc/shared/collectedHeap.inline.hpp"

#include "interpreter/bytecodes.hpp"

#include "memory/resourceArea.hpp"

#include "nativeInst_s390.hpp"

#include "oops/oop.inline.hpp"

#define __ masm.

int InlineCacheBuffer::ic_stub_code_size() {

  return MacroAssembler::load_const_size() + Assembler::z_brul_size();

}

void InlineCacheBuffer::assemble_ic_buffer_code(address code_begin, void* cached_oop, address entry_point) {

  ResourceMark rm;

  CodeBuffer code(code_begin, ic_stub_code_size());

  MacroAssembler masm(&code);

  // Note: even though the code contains an embedded oop, we do not need reloc info

  // because

  // (1) the oop is old (i.e., doesn't matter for scavenges)

  // (2) these ICStubs are removed *before* a GC happens, so the roots disappear.

  // Load the oop,

  __ load_const(Z_method, (address) cached_oop); // inline cache reg = Z_method

  // and do a tail-call (pc-relative).

  __ z_brul((address) entry_point);

  __ flush();

}

address InlineCacheBuffer::ic_buffer_entry_point(address code_begin) {

  NativeMovConstReg* move = nativeMovConstReg_at(code_begin);   // Creation also verifies the object.

  return MacroAssembler::get_target_addr_pcrel(move->next_instruction_address());

}

void* InlineCacheBuffer::ic_buffer_cached_value(address code_begin) {

  NativeMovConstReg* move = nativeMovConstReg_at(code_begin);   // Creation also verifies the object.

  return (void*)move->data();

}