1 /*
2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "asm/macroAssembler.inline.hpp"
27 #include "code/icBuffer.hpp"
28 #include "gc/shared/collectedHeap.inline.hpp"
29 #include "interpreter/bytecodes.hpp"
30 #include "memory/resourceArea.hpp"
31 #include "nativeInst_sparc.hpp"
32 #include "oops/oop.inline.hpp"
33
ic_stub_code_size()34 int InlineCacheBuffer::ic_stub_code_size() {
35 return (NativeMovConstReg::instruction_size + // sethi;add
36 NativeJump::instruction_size + // sethi; jmp; delay slot
37 (1*BytesPerInstWord) + 1); // flush + 1 extra byte
38 }
39
assemble_ic_buffer_code(address code_begin,void * cached_value,address entry_point)40 void InlineCacheBuffer::assemble_ic_buffer_code(address code_begin, void* cached_value, address entry_point) {
41 ResourceMark rm;
42 CodeBuffer code(code_begin, ic_stub_code_size());
43 MacroAssembler* masm = new MacroAssembler(&code);
44 // note: even though the code contains an embedded metadata, we do not need reloc info
45 // because
46 // (1) the metadata is old (i.e., doesn't matter for scavenges)
47 // (2) these ICStubs are removed *before* a GC happens, so the roots disappear
48 AddressLiteral cached_value_addrlit((address)cached_value, relocInfo::none);
49 // Force the set to generate the fixed sequence so next_instruction_address works
50 masm->patchable_set(cached_value_addrlit, G5_inline_cache_reg);
51 assert(G3_scratch != G5_method, "Do not clobber the method oop in the transition stub");
52 assert(G3_scratch != G5_inline_cache_reg, "Do not clobber the inline cache register in the transition stub");
53 AddressLiteral entry(entry_point);
54 masm->JUMP(entry, G3_scratch, 0);
55 masm->delayed()->nop();
56 masm->flush();
57 }
58
59
ic_buffer_entry_point(address code_begin)60 address InlineCacheBuffer::ic_buffer_entry_point(address code_begin) {
61 NativeMovConstReg* move = nativeMovConstReg_at(code_begin); // creation also verifies the object
62 NativeJump* jump = nativeJump_at(move->next_instruction_address());
63 return jump->jump_destination();
64 }
65
66
ic_buffer_cached_value(address code_begin)67 void* InlineCacheBuffer::ic_buffer_cached_value(address code_begin) {
68 NativeMovConstReg* move = nativeMovConstReg_at(code_begin); // creation also verifies the object
69 NativeJump* jump = nativeJump_at(move->next_instruction_address());
70 void* o = (void*)move->data();
71 return o;
72 }
73