|
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_sparc.cpp.incl" |
|
27 |
|
28 int InlineCacheBuffer::ic_stub_code_size() { |
|
29 #ifdef _LP64 |
|
30 if (TraceJumps) return 600 * wordSize; |
|
31 return (NativeMovConstReg::instruction_size + // sethi;add |
|
32 NativeJump::instruction_size + // sethi; jmp; delay slot |
|
33 (1*BytesPerInstWord) + 1); // flush + 1 extra byte |
|
34 #else |
|
35 if (TraceJumps) return 300 * wordSize; |
|
36 return (2+2+ 1) * wordSize + 1; // set/jump_to/nop + 1 byte so that code_end can be set in CodeBuffer |
|
37 #endif |
|
38 } |
|
39 |
|
40 void InlineCacheBuffer::assemble_ic_buffer_code(address code_begin, oop cached_oop, 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 oop, we do not need reloc info |
|
45 // because |
|
46 // (1) the oop is old (i.e., doesn't matter for scavenges) |
|
47 // (2) these ICStubs are removed *before* a GC happens, so the roots disappear |
|
48 assert(cached_oop == NULL || cached_oop->is_perm(), "must be old oop"); |
|
49 Address cached_oop_addr(G5_inline_cache_reg, address(cached_oop)); |
|
50 // Force the sethi to generate the fixed sequence so next_instruction_address works |
|
51 masm->sethi(cached_oop_addr, true /* ForceRelocatable */ ); |
|
52 masm->add(cached_oop_addr, G5_inline_cache_reg); |
|
53 assert(G3_scratch != G5_method, "Do not clobber the method oop in the transition stub"); |
|
54 assert(G3_scratch != G5_inline_cache_reg, "Do not clobber the inline cache register in the transition stub"); |
|
55 Address entry(G3_scratch, entry_point); |
|
56 masm->JUMP(entry, 0); |
|
57 masm->delayed()->nop(); |
|
58 masm->flush(); |
|
59 } |
|
60 |
|
61 |
|
62 address InlineCacheBuffer::ic_buffer_entry_point(address code_begin) { |
|
63 NativeMovConstReg* move = nativeMovConstReg_at(code_begin); // creation also verifies the object |
|
64 NativeJump* jump = nativeJump_at(move->next_instruction_address()); |
|
65 return jump->jump_destination(); |
|
66 } |
|
67 |
|
68 |
|
69 oop InlineCacheBuffer::ic_buffer_cached_oop(address code_begin) { |
|
70 NativeMovConstReg* move = nativeMovConstReg_at(code_begin); // creation also verifies the object |
|
71 NativeJump* jump = nativeJump_at(move->next_instruction_address()); |
|
72 return (oop)move->data(); |
|
73 } |