icBuffer_x86.cpp revision 0:a61af66fc99e 
1/*
2 * Copyright 1997-2006 Sun Microsystems, Inc.  All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25#include "incls/_precompiled.incl"
26#include "incls/_icBuffer_x86.cpp.incl"
27
28int InlineCacheBuffer::ic_stub_code_size() {
29  return NativeMovConstReg::instruction_size +
30         NativeJump::instruction_size +
31         1;
32  // so that code_end can be set in CodeBuffer
33  // 64bit 16 = 5 + 10 bytes + 1 byte
34  // 32bit 11 = 10 bytes + 1 byte
35}
36
37
38
39void InlineCacheBuffer::assemble_ic_buffer_code(address code_begin, oop cached_oop, address entry_point) {
40  ResourceMark rm;
41  CodeBuffer      code(code_begin, ic_stub_code_size());
42  MacroAssembler* masm            = new MacroAssembler(&code);
43  // note: even though the code contains an embedded oop, we do not need reloc info
44  // because
45  // (1) the oop is old (i.e., doesn't matter for scavenges)
46  // (2) these ICStubs are removed *before* a GC happens, so the roots disappear
47  assert(cached_oop == NULL || cached_oop->is_perm(), "must be perm oop");
48  masm->lea(rax, OopAddress((address) cached_oop));
49  masm->jump(ExternalAddress(entry_point));
50}
51
52
53address InlineCacheBuffer::ic_buffer_entry_point(address code_begin) {
54  NativeMovConstReg* move = nativeMovConstReg_at(code_begin);   // creation also verifies the object
55  NativeJump*        jump = nativeJump_at(move->next_instruction_address());
56  return jump->jump_destination();
57}
58
59
60oop InlineCacheBuffer::ic_buffer_cached_oop(address code_begin) {
61  // creation also verifies the object
62  NativeMovConstReg* move = nativeMovConstReg_at(code_begin);
63  // Verifies the jump
64  NativeJump*        jump = nativeJump_at(move->next_instruction_address());
65  return (oop)move->data();
66}
67