1 /*
2 * Copyright 2000-2008 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.compiler;
26
27 import java.util.*;
28
29 import sun.jvm.hotspot.code.*;
30 import sun.jvm.hotspot.runtime.*;
31 import sun.jvm.hotspot.types.*;
32 import sun.jvm.hotspot.utilities.*;
33
34 public class OopMapValue {
35 private short value;
36 private short contentReg;
37
38 /** Read from target VM; located in compiler/oopMap.hpp */
39 // How bits are organized
40 static int TYPE_BITS;
41 static int REGISTER_BITS;
42 static int TYPE_SHIFT;
43 static int REGISTER_SHIFT;
44 static int TYPE_MASK;
45 static int TYPE_MASK_IN_PLACE;
46 static int REGISTER_MASK;
47 static int REGISTER_MASK_IN_PLACE;
48
49 // Types of OopValues
50 static int UNUSED_VALUE;
51 static int OOP_VALUE;
52 static int VALUE_VALUE;
53 static int NARROWOOP_VALUE;
54 static int CALLEE_SAVED_VALUE;
55 static int DERIVED_OOP_VALUE;
56
57 static {
58 VM.registerVMInitializedObserver(new Observer() {
59 public void update(Observable o, Object data) {
60 initialize(VM.getVM().getTypeDataBase());
61 }
62 });
63 }
64
65 private static void initialize(TypeDataBase db) {
66 TYPE_BITS = db.lookupIntConstant("OopMapValue::type_bits").intValue();
67 REGISTER_BITS = db.lookupIntConstant("OopMapValue::register_bits").intValue();
68 TYPE_SHIFT = db.lookupIntConstant("OopMapValue::type_shift").intValue();
69 REGISTER_SHIFT = db.lookupIntConstant("OopMapValue::register_shift").intValue();
70 TYPE_MASK = db.lookupIntConstant("OopMapValue::type_mask").intValue();
71 TYPE_MASK_IN_PLACE = db.lookupIntConstant("OopMapValue::type_mask_in_place").intValue();
72 REGISTER_MASK = db.lookupIntConstant("OopMapValue::register_mask").intValue();
73 REGISTER_MASK_IN_PLACE = db.lookupIntConstant("OopMapValue::register_mask_in_place").intValue();
74 UNUSED_VALUE = db.lookupIntConstant("OopMapValue::unused_value").intValue();
75 OOP_VALUE = db.lookupIntConstant("OopMapValue::oop_value").intValue();
76 VALUE_VALUE = db.lookupIntConstant("OopMapValue::value_value").intValue();
77 NARROWOOP_VALUE = db.lookupIntConstant("OopMapValue::narrowoop_value").intValue();
78 CALLEE_SAVED_VALUE = db.lookupIntConstant("OopMapValue::callee_saved_value").intValue();
79 DERIVED_OOP_VALUE = db.lookupIntConstant("OopMapValue::derived_oop_value").intValue();
80 }
81
82 public static abstract class OopTypes {
83 public static final OopTypes UNUSED_VALUE = new OopTypes() { int getValue() { return OopMapValue.UNUSED_VALUE; }};
84 public static final OopTypes OOP_VALUE = new OopTypes() { int getValue() { return OopMapValue.OOP_VALUE; }};
85 public static final OopTypes VALUE_VALUE = new OopTypes() { int getValue() { return OopMapValue.VALUE_VALUE; }};
86 public static final OopTypes NARROWOOP_VALUE = new OopTypes() { int getValue() { return OopMapValue.NARROWOOP_VALUE; }};
87 public static final OopTypes CALLEE_SAVED_VALUE = new OopTypes() { int getValue() { return OopMapValue.CALLEE_SAVED_VALUE; }};
88 public static final OopTypes DERIVED_OOP_VALUE = new OopTypes() { int getValue() { return OopMapValue.DERIVED_OOP_VALUE; }};
89
90 abstract int getValue();
91 protected OopTypes() {}
92 }
93
94 public OopMapValue() { setValue((short) 0); setContentReg(new VMReg(0)); }
95 public OopMapValue(VMReg reg, OopTypes t) { setReg(reg); setType(t); }
96 public OopMapValue(VMReg reg, OopTypes t, VMReg reg2) { setReg(reg); setType(t); setContentReg(reg2); }
97 public OopMapValue(CompressedReadStream stream) { readFrom(stream); }
98
99 public void readFrom(CompressedReadStream stream) {
100 setValue((short) stream.readInt());
101 if (isCalleeSaved() || isDerivedOop()) {
102 setContentReg(new VMReg(stream.readInt()));
103 }
104 }
105
106 // Querying
107 public boolean isOop() { return (getValue() & TYPE_MASK_IN_PLACE) == OOP_VALUE; }
108 public boolean isValue() { return (getValue() & TYPE_MASK_IN_PLACE) == VALUE_VALUE; }
109 public boolean isNarrowOop() { return (getValue() & TYPE_MASK_IN_PLACE) == NARROWOOP_VALUE; }
110 public boolean isCalleeSaved() { return (getValue() & TYPE_MASK_IN_PLACE) == CALLEE_SAVED_VALUE; }
111 public boolean isDerivedOop() { return (getValue() & TYPE_MASK_IN_PLACE) == DERIVED_OOP_VALUE; }
112
113 public VMReg getReg() { return new VMReg((getValue() & REGISTER_MASK_IN_PLACE) >> REGISTER_SHIFT); }
114 public void setReg(VMReg r) { setValue((short) (r.getValue() << REGISTER_SHIFT | (getValue() & TYPE_MASK_IN_PLACE))); }
115
116 public OopTypes getType() {
117 int which = (getValue() & TYPE_MASK_IN_PLACE);
118 if (which == UNUSED_VALUE) return OopTypes.UNUSED_VALUE;
119 else if (which == OOP_VALUE) return OopTypes.OOP_VALUE;
120 else if (which == VALUE_VALUE) return OopTypes.VALUE_VALUE;
121 else if (which == NARROWOOP_VALUE) return OopTypes.NARROWOOP_VALUE;
122 else if (which == CALLEE_SAVED_VALUE) return OopTypes.CALLEE_SAVED_VALUE;
123 else if (which == DERIVED_OOP_VALUE) return OopTypes.DERIVED_OOP_VALUE;
124 else throw new InternalError("unknown which " + which + " (TYPE_MASK_IN_PLACE = " + TYPE_MASK_IN_PLACE + ")");
125 }
126 public void setType(OopTypes t) { setValue((short) ((getValue() & REGISTER_MASK_IN_PLACE) | t.getValue())); }
127
128 public VMReg getContentReg() { return new VMReg(contentReg); }
129 public void setContentReg(VMReg r) { contentReg = (short) r.getValue(); }
130
131 /** Physical location queries */
132 public boolean isRegisterLoc() { return (getReg().lessThan(VM.getVM().getVMRegImplInfo().getStack0())); }
133 public boolean isStackLoc() { return (getReg().greaterThanOrEqual(VM.getVM().getVMRegImplInfo().getStack0())); }
134
135 /** Returns offset from sp. */
136 public int getStackOffset() {
137 if (Assert.ASSERTS_ENABLED) {
138 Assert.that(isStackLoc(), "must be stack location");
139 }
140 return getReg().minus(VM.getVM().getVMRegImplInfo().getStack0());
141 }
142
143 //--------------------------------------------------------------------------------
144 // Internals only below this point
145 //
146
147 private void setValue(short value) {
148 this.value = value;
149 }
150
151 private int getValue() {
152 return value;
153 }
154 }