icBuffer_ppc.cpp revision 8413:92457dfb91bd 
1/*
2 * Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
3 * Copyright 2012, 2013 SAP AG. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
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24 */
25
26#include "precompiled.hpp"
27#include "asm/assembler.hpp"
28#include "assembler_ppc.inline.hpp"
29#include "code/icBuffer.hpp"
30#include "gc/shared/collectedHeap.inline.hpp"
31#include "interpreter/bytecodes.hpp"
32#include "memory/resourceArea.hpp"
33#include "nativeInst_ppc.hpp"
34#include "oops/oop.inline.hpp"
35
36#define __ masm.
37
38int InlineCacheBuffer::ic_stub_code_size() {
39  return MacroAssembler::load_const_size + MacroAssembler::b64_patchable_size;
40}
41
42void InlineCacheBuffer::assemble_ic_buffer_code(address code_begin, void* cached_value, address entry_point) {
43  ResourceMark rm;
44  CodeBuffer code(code_begin, ic_stub_code_size());
45  MacroAssembler masm(&code);
46  // Note: even though the code contains an embedded metadata, we do not need reloc info
47  // because
48  // (1) the metadata is old (i.e., doesn't matter for scavenges)
49  // (2) these ICStubs are removed *before* a GC happens, so the roots disappear.
50
51  // Load the oop ...
52  __ load_const(R19_method, (address) cached_value, R0);
53  // ... and jump to entry point.
54  __ b64_patchable((address) entry_point, relocInfo::none);
55
56  __ flush();
57}
58
59address InlineCacheBuffer::ic_buffer_entry_point(address code_begin) {
60  NativeMovConstReg* move = nativeMovConstReg_at(code_begin);   // creation also verifies the object
61  NativeJump*        jump = nativeJump_at(move->next_instruction_address());
62  return jump->jump_destination();
63}
64
65void* InlineCacheBuffer::ic_buffer_cached_value(address code_begin) {
66  NativeMovConstReg* move = nativeMovConstReg_at(code_begin);   // creation also verifies the object
67  void* o = (void*)move->data();
68  return o;
69}
70
71