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comparison agent/src/share/classes/sun/jvm/hotspot/asm/sparc/JmplDecoder.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2002 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 package sun.jvm.hotspot.asm.sparc;
26
27 import sun.jvm.hotspot.asm.*;
28
29 class JmplDecoder extends MemoryInstructionDecoder {
30 JmplDecoder() {
31 super(JMPL, "jmpl", RTLDT_UNSIGNED_WORD);
32 }
33
34 Instruction decodeMemoryInstruction(int instruction, SPARCRegisterIndirectAddress addr,
35 SPARCRegister rd, SPARCInstructionFactory factory) {
36 // this may be most probably indirect call or ret or retl
37 Instruction instr = null;
38 if (rd == SPARCRegisters.O7) {
39 instr = factory.newIndirectCallInstruction(addr, rd);
40 } else if (rd == SPARCRegisters.G0) {
41 int disp = (int) addr.getDisplacement();
42 Register base = addr.getBase();
43 if (base == SPARCRegisters.I7 && disp == 8) {
44 instr = factory.newReturnInstruction(addr, rd, false /* not leaf */);
45 } else if (base == SPARCRegisters.O7 && disp == 8) {
46 instr = factory.newReturnInstruction(addr, rd, true /* leaf */);
47 } else {
48 instr = factory.newJmplInstruction(addr, rd);
49 }
50 } else {
51 instr = factory.newJmplInstruction(addr, rd);
52 }
53 return instr;
54 }
55 }