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comparison agent/src/share/classes/sun/jvm/hotspot/oops/Method.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 /*
2 * Copyright 2000-2004 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.oops;
26
27 import java.io.*;
28 import java.util.*;
29 import sun.jvm.hotspot.code.*;
30 import sun.jvm.hotspot.debugger.*;
31 import sun.jvm.hotspot.interpreter.*;
32 import sun.jvm.hotspot.memory.*;
33 import sun.jvm.hotspot.runtime.*;
34 import sun.jvm.hotspot.types.*;
35 import sun.jvm.hotspot.utilities.*;
36
37 // A Method represents a Java method
38
39 public class Method extends Oop {
40 static {
41 VM.registerVMInitializedObserver(new Observer() {
42 public void update(Observable o, Object data) {
43 initialize(VM.getVM().getTypeDataBase());
44 }
45 });
46 }
47
48 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
49 Type type = db.lookupType("methodOopDesc");
50 constMethod = new OopField(type.getOopField("_constMethod"), 0);
51 constants = new OopField(type.getOopField("_constants"), 0);
52 methodSize = new CIntField(type.getCIntegerField("_method_size"), 0);
53 maxStack = new CIntField(type.getCIntegerField("_max_stack"), 0);
54 maxLocals = new CIntField(type.getCIntegerField("_max_locals"), 0);
55 sizeOfParameters = new CIntField(type.getCIntegerField("_size_of_parameters"), 0);
56 accessFlags = new CIntField(type.getCIntegerField("_access_flags"), 0);
57 code = type.getAddressField("_code");
58 vtableIndex = new CIntField(type.getCIntegerField("_vtable_index"), 0);
59 if (!VM.getVM().isCore()) {
60 invocationCounter = new CIntField(type.getCIntegerField("_invocation_counter"), 0);
61 }
62 bytecodeOffset = type.getSize();
63
64 /*
65 interpreterEntry = type.getAddressField("_interpreter_entry");
66 fromCompiledCodeEntryPoint = type.getAddressField("_from_compiled_code_entry_point");
67
68 */
69 objectInitializerName = null;
70 classInitializerName = null;
71 }
72
73 Method(OopHandle handle, ObjectHeap heap) {
74 super(handle, heap);
75 }
76
77 public boolean isMethod() { return true; }
78
79 // Fields
80 private static OopField constMethod;
81 private static OopField constants;
82 private static CIntField methodSize;
83 private static CIntField maxStack;
84 private static CIntField maxLocals;
85 private static CIntField sizeOfParameters;
86 private static CIntField accessFlags;
87 private static CIntField vtableIndex;
88 private static CIntField invocationCounter;
89 private static long bytecodeOffset;
90
91 private static AddressField code;
92
93 // constant method names - <init>, <clinit>
94 // Initialized lazily to avoid initialization ordering dependencies between Method and SymbolTable
95 private static Symbol objectInitializerName;
96 private static Symbol classInitializerName;
97 private static Symbol objectInitializerName() {
98 if (objectInitializerName == null) {
99 objectInitializerName = VM.getVM().getSymbolTable().probe("<init>");
100 }
101 return objectInitializerName;
102 }
103 private static Symbol classInitializerName() {
104 if (classInitializerName == null) {
105 classInitializerName = VM.getVM().getSymbolTable().probe("<clinit>");
106 }
107 return classInitializerName;
108 }
109
110
111 /*
112 private static AddressCField interpreterEntry;
113 private static AddressCField fromCompiledCodeEntryPoint;
114 */
115
116 // Accessors for declared fields
117 public ConstMethod getConstMethod() { return (ConstMethod) constMethod.getValue(this); }
118 public ConstantPool getConstants() { return (ConstantPool) constants.getValue(this); }
119 public TypeArray getExceptionTable() { return getConstMethod().getExceptionTable(); }
120 /** WARNING: this is in words, not useful in this system; use getObjectSize() instead */
121 public long getMethodSize() { return methodSize.getValue(this); }
122 public long getMaxStack() { return maxStack.getValue(this); }
123 public long getMaxLocals() { return maxLocals.getValue(this); }
124 public long getSizeOfParameters() { return sizeOfParameters.getValue(this); }
125 public long getNameIndex() { return getConstMethod().getNameIndex(); }
126 public long getSignatureIndex() { return getConstMethod().getSignatureIndex(); }
127 public long getGenericSignatureIndex() { return getConstMethod().getGenericSignatureIndex(); }
128 public long getAccessFlags() { return accessFlags.getValue(this); }
129 public long getCodeSize() { return getConstMethod().getCodeSize(); }
130 public long getVtableIndex() { return vtableIndex.getValue(this); }
131 public long getInvocationCounter() {
132 if (Assert.ASSERTS_ENABLED) {
133 Assert.that(!VM.getVM().isCore(), "must not be used in core build");
134 }
135 return invocationCounter.getValue(this);
136 }
137
138 // get associated compiled native method, if available, else return null.
139 public NMethod getNativeMethod() {
140 Address addr = code.getValue(getHandle());
141 return (NMethod) VMObjectFactory.newObject(NMethod.class, addr);
142 }
143
144 // Convenience routine
145 public AccessFlags getAccessFlagsObj() {
146 return new AccessFlags(getAccessFlags());
147 }
148
149 /** Get a bytecode or breakpoint at the given bci */
150 public int getBytecodeOrBPAt(int bci) {
151 return getConstMethod().getBytecodeOrBPAt(bci);
152 }
153
154 /** Fetch the original non-breakpoint bytecode at the specified
155 bci. It is required that there is currently a bytecode at this
156 bci. */
157 public int getOrigBytecodeAt(int bci) {
158 BreakpointInfo bp = ((InstanceKlass) getMethodHolder()).getBreakpoints();
159 for (; bp != null; bp = bp.getNext()) {
160 if (bp.match(this, bci)) {
161 return bp.getOrigBytecode();
162 }
163 }
164 System.err.println("Requested bci " + bci);
165 for (; bp != null; bp = bp.getNext()) {
166 System.err.println("Breakpoint at bci " + bp.getBCI() + ", bytecode " +
167 bp.getOrigBytecode());
168 }
169 Assert.that(false, "Should not reach here");
170 return -1; // not reached
171 }
172
173 public byte getBytecodeByteArg(int bci) {
174 return getConstMethod().getBytecodeByteArg(bci);
175 }
176
177 /** Fetches a 16-bit big-endian ("Java ordered") value from the
178 bytecode stream */
179 public short getBytecodeShortArg(int bci) {
180 return getConstMethod().getBytecodeShortArg(bci);
181 }
182
183 /** Fetches a 32-bit big-endian ("Java ordered") value from the
184 bytecode stream */
185 public int getBytecodeIntArg(int bci) {
186 return getConstMethod().getBytecodeIntArg(bci);
187 }
188
189 public byte[] getByteCode() {
190 return getConstMethod().getByteCode();
191 }
192
193 /*
194 public Address getCode() { return codeField.getValue(this); }
195 public Address getInterpreterEntry() { return interpreterEntryField.getValue(this); }
196 public Address getFromCompiledCodeEntryPoint() { return fromCompiledCodeEntryPointField.getValue(this); }
197 */
198 // Accessors
199 public Symbol getName() { return (Symbol) getConstants().getObjAt(getNameIndex()); }
200 public Symbol getSignature() { return (Symbol) getConstants().getObjAt(getSignatureIndex()); }
201 public Symbol getGenericSignature() {
202 long index = getGenericSignatureIndex();
203 return (index != 0L) ? (Symbol) getConstants().getObjAt(index) : null;
204 }
205
206 // Method holder (the Klass holding this method)
207 public Klass getMethodHolder() { return getConstants().getPoolHolder(); }
208
209 // Access flags
210 public boolean isPublic() { return getAccessFlagsObj().isPublic(); }
211 public boolean isPrivate() { return getAccessFlagsObj().isPrivate(); }
212 public boolean isProtected() { return getAccessFlagsObj().isProtected(); }
213 public boolean isPackagePrivate() { AccessFlags af = getAccessFlagsObj();
214 return (!af.isPublic() && !af.isPrivate() && !af.isProtected()); }
215 public boolean isStatic() { return getAccessFlagsObj().isStatic(); }
216 public boolean isFinal() { return getAccessFlagsObj().isFinal(); }
217 public boolean isSynchronized() { return getAccessFlagsObj().isSynchronized(); }
218 public boolean isBridge() { return getAccessFlagsObj().isBridge(); }
219 public boolean isVarArgs() { return getAccessFlagsObj().isVarArgs(); }
220 public boolean isNative() { return getAccessFlagsObj().isNative(); }
221 public boolean isAbstract() { return getAccessFlagsObj().isAbstract(); }
222 public boolean isStrict() { return getAccessFlagsObj().isStrict(); }
223 public boolean isSynthetic() { return getAccessFlagsObj().isSynthetic(); }
224
225 public boolean isConstructor() {
226 return (!isStatic()) && getName().equals(objectInitializerName());
227 }
228
229 public boolean isStaticInitializer() {
230 return isStatic() && getName().equals(classInitializerName());
231 }
232
233 public boolean isObsolete() {
234 return getAccessFlagsObj().isObsolete();
235 }
236
237 public OopMapCacheEntry getMaskFor(int bci) {
238 OopMapCacheEntry entry = new OopMapCacheEntry();
239 entry.fill(this, bci);
240 return entry;
241 }
242
243 public long getObjectSize() {
244 return getMethodSize() * getHeap().getOopSize();
245 }
246
247 public void printValueOn(PrintStream tty) {
248 tty.print("Method " + getName().asString() + getSignature().asString() + "@" + getHandle());
249 }
250
251 public void iterateFields(OopVisitor visitor, boolean doVMFields) {
252 super.iterateFields(visitor, doVMFields);
253 if (doVMFields) {
254 visitor.doOop(constMethod, true);
255 visitor.doOop(constants, true);
256 visitor.doCInt(methodSize, true);
257 visitor.doCInt(maxStack, true);
258 visitor.doCInt(maxLocals, true);
259 visitor.doCInt(sizeOfParameters, true);
260 visitor.doCInt(accessFlags, true);
261 }
262 }
263
264 public boolean hasLineNumberTable() {
265 return getConstMethod().hasLineNumberTable();
266 }
267
268 public int getLineNumberFromBCI(int bci) {
269 return getConstMethod().getLineNumberFromBCI(bci);
270 }
271
272 public LineNumberTableElement[] getLineNumberTable() {
273 return getConstMethod().getLineNumberTable();
274 }
275
276 public boolean hasLocalVariableTable() {
277 return getConstMethod().hasLocalVariableTable();
278 }
279
280 /** Should only be called if table is present */
281 public LocalVariableTableElement[] getLocalVariableTable() {
282 return getConstMethod().getLocalVariableTable();
283 }
284
285 public Symbol getLocalVariableName(int bci, int slot) {
286 if (! hasLocalVariableTable()) {
287 return null;
288 }
289
290 LocalVariableTableElement[] locals = getLocalVariableTable();
291 for (int l = 0; l < locals.length; l++) {
292 LocalVariableTableElement local = locals[l];
293 if ((bci >= local.getStartBCI()) &&
294 (bci < (local.getStartBCI() + local.getLength())) &&
295 slot == local.getSlot()) {
296 return getConstants().getSymbolAt(local.getNameCPIndex());
297 }
298 }
299
300 return null;
301 }
302
303 public boolean hasCheckedExceptions() {
304 return getConstMethod().hasCheckedExceptions();
305 }
306
307 /** Should only be called if table is present */
308 public CheckedExceptionElement[] getCheckedExceptions() {
309 return getConstMethod().getCheckedExceptions();
310 }
311
312 /** Returns name and signature in external form for debugging
313 purposes */
314 public String externalNameAndSignature() {
315 final StringBuffer buf = new StringBuffer();
316 buf.append(getMethodHolder().getName().asString());
317 buf.append(".");
318 buf.append(getName().asString());
319 buf.append("(");
320 new SignatureConverter(getSignature(), buf).iterateParameters();
321 buf.append(")");
322 return buf.toString().replace('/', '.');
323 }
324 }