1 /*
2 * Copyright 2000-2005 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.code;
26
27 import java.io.*;
28 import java.util.*;
29
30 import sun.jvm.hotspot.compiler.*;
31 import sun.jvm.hotspot.debugger.*;
32 import sun.jvm.hotspot.runtime.*;
33 import sun.jvm.hotspot.types.*;
34 import sun.jvm.hotspot.utilities.*;
35
36 public class CodeBlob extends VMObject {
37 private static AddressField nameField;
38 private static CIntegerField sizeField;
39 private static CIntegerField headerSizeField;
40 private static CIntegerField relocationSizeField;
41 private static CIntegerField instructionsOffsetField;
42 private static CIntegerField frameCompleteOffsetField;
43 private static CIntegerField dataOffsetField;
44 private static CIntegerField oopsOffsetField;
45 private static CIntegerField oopsLengthField;
46 private static CIntegerField frameSizeField;
47 private static AddressField oopMapsField;
48
49 // Only used by server compiler on x86; computed over in SA rather
50 // than relying on computation in target VM
51 private static final int NOT_YET_COMPUTED = -2;
52 private static final int UNDEFINED = -1;
53 private int linkOffset = NOT_YET_COMPUTED;
54 private static int matcherInterpreterFramePointerReg;
55
56 static {
57 VM.registerVMInitializedObserver(new Observer() {
58 public void update(Observable o, Object data) {
59 initialize(VM.getVM().getTypeDataBase());
60 }
61 });
62 }
63
64 private static void initialize(TypeDataBase db) {
65 Type type = db.lookupType("CodeBlob");
66
67 nameField = type.getAddressField("_name");
68 sizeField = type.getCIntegerField("_size");
69 headerSizeField = type.getCIntegerField("_header_size");
70 relocationSizeField = type.getCIntegerField("_relocation_size");
71 frameCompleteOffsetField = type.getCIntegerField("_frame_complete_offset");
72 instructionsOffsetField = type.getCIntegerField("_instructions_offset");
73 dataOffsetField = type.getCIntegerField("_data_offset");
74 oopsOffsetField = type.getCIntegerField("_oops_offset");
75 oopsLengthField = type.getCIntegerField("_oops_length");
76 frameSizeField = type.getCIntegerField("_frame_size");
77 oopMapsField = type.getAddressField("_oop_maps");
78
79 if (VM.getVM().isServerCompiler()) {
80 matcherInterpreterFramePointerReg =
81 db.lookupIntConstant("Matcher::interpreter_frame_pointer_reg").intValue();
82 }
83 }
84
85 public CodeBlob(Address addr) {
86 super(addr);
87 }
88
89 // Typing
90 public boolean isBufferBlob() { return false; }
91 public boolean isNMethod() { return false; }
92 public boolean isRuntimeStub() { return false; }
93 public boolean isDeoptimizationStub() { return false; }
94 public boolean isUncommonTrapStub() { return false; }
95 public boolean isExceptionStub() { return false; }
96 public boolean isSafepointStub() { return false; }
97
98 // Fine grain nmethod support: isNmethod() == isJavaMethod() || isNativeMethod() || isOSRMethod()
99 public boolean isJavaMethod() { return false; }
100 public boolean isNativeMethod() { return false; }
101 /** On-Stack Replacement method */
102 public boolean isOSRMethod() { return false; }
103
104 // Boundaries
105 public Address headerBegin() {
106 return addr;
107 }
108
109 public Address headerEnd() {
110 return addr.addOffsetTo(headerSizeField.getValue(addr));
111 }
112
113 // FIXME: add RelocInfo
114 // public RelocInfo relocationBegin();
115 // public RelocInfo relocationEnd();
116
117 public Address instructionsBegin() {
118 return headerBegin().addOffsetTo(instructionsOffsetField.getValue(addr));
119 }
120
121 public Address instructionsEnd() {
122 return headerBegin().addOffsetTo(dataOffsetField.getValue(addr));
123 }
124
125 public Address dataBegin() {
126 return headerBegin().addOffsetTo(dataOffsetField.getValue(addr));
127 }
128
129 public Address dataEnd() {
130 return headerBegin().addOffsetTo(sizeField.getValue(addr));
131 }
132
133 public Address oopsBegin() {
134 return headerBegin().addOffsetTo(oopsOffsetField.getValue(addr));
135 }
136
137 public Address oopsEnd() {
138 return oopsBegin().addOffsetTo(getOopsLength());
139 }
140
141 // Offsets
142 public int getRelocationOffset() { return (int) headerSizeField.getValue(addr); }
143 public int getInstructionsOffset() { return (int) instructionsOffsetField.getValue(addr); }
144 public int getDataOffset() { return (int) dataOffsetField.getValue(addr); }
145 public int getOopsOffset() { return (int) oopsOffsetField.getValue(addr); }
146
147 // Sizes
148 public int getSize() { return (int) sizeField.getValue(addr); }
149 public int getHeaderSize() { return (int) headerSizeField.getValue(addr); }
150 // FIXME: add getRelocationSize()
151 public int getInstructionsSize() { return (int) instructionsEnd().minus(instructionsBegin()); }
152 public int getDataSize() { return (int) dataEnd().minus(dataBegin()); }
153
154 // Containment
155 public boolean blobContains(Address addr) { return headerBegin().lessThanOrEqual(addr) && dataEnd().greaterThan(addr); }
156 // FIXME: add relocationContains
157 public boolean instructionsContains(Address addr) { return instructionsBegin().lessThanOrEqual(addr) && instructionsEnd().greaterThan(addr); }
158 public boolean dataContains(Address addr) { return dataBegin().lessThanOrEqual(addr) && dataEnd().greaterThan(addr); }
159 public boolean oopsContains(Address addr) { return oopsBegin().lessThanOrEqual(addr) && oopsEnd().greaterThan(addr); }
160 public boolean contains(Address addr) { return instructionsContains(addr); }
161 public boolean isFrameCompleteAt(Address a) { return instructionsContains(a) && a.minus(instructionsBegin()) >= frameCompleteOffsetField.getValue(addr); }
162
163 /** Support for oops in scopes and relocs. Note: index 0 is reserved for null. */
164 public OopHandle getOopAt(int index) {
165 if (index == 0) return null;
166 if (Assert.ASSERTS_ENABLED) {
167 Assert.that(index > 0 && index <= getOopsLength(), "must be a valid non-zero index");
168 }
169 return oopsBegin().getOopHandleAt((index - 1) * VM.getVM().getOopSize());
170 }
171
172 // Reclamation support (really only used by the nmethods, but in order to get asserts to work
173 // in the CodeCache they are defined virtual here)
174 public boolean isZombie() { return false; }
175 public boolean isLockedByVM() { return false; }
176
177 /** OopMap for frame; can return null if none available */
178 public OopMapSet getOopMaps() {
179 Address oopMapsAddr = oopMapsField.getValue(addr);
180 if (oopMapsAddr == null) {
181 return null;
182 }
183 return new OopMapSet(oopMapsAddr);
184 }
185 // FIXME: not yet implementable
186 // void set_oop_maps(OopMapSet* p);
187
188 public OopMap getOopMapForReturnAddress(Address returnAddress, boolean debugging) {
189 Address pc = returnAddress;
190 if (Assert.ASSERTS_ENABLED) {
191 Assert.that(getOopMaps() != null, "nope");
192 }
193 return getOopMaps().findMapAtOffset(pc.minus(instructionsBegin()), debugging);
194 }
195
196 // virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, void f(oop*)) { ShouldNotReachHere(); }
197 // FIXME;
198
199 /** NOTE: this returns a size in BYTES in this system! */
200 public long getFrameSize() {
201 return VM.getVM().getAddressSize() * frameSizeField.getValue(addr);
202 }
203
204 // Returns true, if the next frame is responsible for GC'ing oops passed as arguments
205 public boolean callerMustGCArguments(JavaThread thread) { return false; }
206
207 public String getName() {
208 return CStringUtilities.getString(nameField.getValue(addr));
209 }
210
211 // FIXME: NOT FINISHED
212
213 // FIXME: add more accessors
214
215 public void print() {
216 printOn(System.out);
217 }
218
219 public void printOn(PrintStream tty) {
220 tty.print(getName());
221 printComponentsOn(tty);
222 }
223
224 protected void printComponentsOn(PrintStream tty) {
225 // FIXME: add relocation information
226 tty.println(" instructions: [" + instructionsBegin() + ", " + instructionsEnd() + "), " +
227 " data: [" + dataBegin() + ", " + dataEnd() + "), " +
228 " oops: [" + oopsBegin() + ", " + oopsEnd() + "), " +
229 " frame size: " + getFrameSize());
230 }
231
232 //--------------------------------------------------------------------------------
233 // Internals only below this point
234 //
235
236 private int getOopsLength() {
237 return (int) oopsLengthField.getValue(addr);
238 }
239 }