/*

 * Copyright (c) 1997, 2012, 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 "asm/macroAssembler.inline.hpp"

#include "code/icBuffer.hpp"

#include "gc_interface/collectedHeap.inline.hpp"

#include "interpreter/bytecodes.hpp"

#include "memory/resourceArea.hpp"

#include "nativeInst_sparc.hpp"

#include "oops/oop.inline.hpp"

#include "oops/oop.inline2.hpp"

int InlineCacheBuffer::ic_stub_code_size() {

#ifdef _LP64

  if (TraceJumps) return 600 * wordSize;

  return (NativeMovConstReg::instruction_size +  // sethi;add

          NativeJump::instruction_size +          // sethi; jmp; delay slot

          (1*BytesPerInstWord) + 1);            // flush + 1 extra byte

#else

  if (TraceJumps) return 300 * wordSize;

  return (2+2+ 1) * wordSize + 1; // set/jump_to/nop + 1 byte so that code_end can be set in CodeBuffer

#endif

}

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

  ResourceMark rm;

  CodeBuffer     code(code_begin, ic_stub_code_size());

  MacroAssembler* masm            = new MacroAssembler(&code);

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

  // because

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

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

  AddressLiteral cached_value_addrlit((address)cached_value, relocInfo::none);

  // Force the set to generate the fixed sequence so next_instruction_address works

  masm->patchable_set(cached_value_addrlit, G5_inline_cache_reg);

  assert(G3_scratch != G5_method, "Do not clobber the method oop in the transition stub");

  assert(G3_scratch != G5_inline_cache_reg, "Do not clobber the inline cache register in the transition stub");

  AddressLiteral entry(entry_point);

  masm->JUMP(entry, G3_scratch, 0);

  masm->delayed()->nop();

  masm->flush();

}

address InlineCacheBuffer::ic_buffer_entry_point(address code_begin) {

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

  NativeJump*        jump = nativeJump_at(move->next_instruction_address());

  return jump->jump_destination();

}

void* InlineCacheBuffer::ic_buffer_cached_value(address code_begin) {

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

  NativeJump*        jump = nativeJump_at(move->next_instruction_address());

  void* o = (void*)move->data();

  return o;

}