1 /* 2 * Copyright (c) 2000, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * 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 methodData = new OopField(type.getOopField("_method_data"), 0); 53 methodSize = new CIntField(type.getCIntegerField("_method_size"), 0); 54 maxStack = new CIntField(type.getCIntegerField("_max_stack"), 0); 55 maxLocals = new CIntField(type.getCIntegerField("_max_locals"), 0); 56 sizeOfParameters = new CIntField(type.getCIntegerField("_size_of_parameters"), 0); 57 accessFlags = new CIntField(type.getCIntegerField("_access_flags"), 0); 58 code = type.getAddressField("_code"); 59 vtableIndex = new CIntField(type.getCIntegerField("_vtable_index"), 0); 60 if (!VM.getVM().isCore()) { 61 invocationCounter = new CIntField(type.getCIntegerField("_invocation_counter"), 0); 62 backedgeCounter = new CIntField(type.getCIntegerField("_backedge_counter"), 0); 63 } 64 bytecodeOffset = type.getSize(); 65 66 interpreterThrowoutCountField = new CIntField(type.getCIntegerField("_interpreter_throwout_count"), 0); 67 interpreterInvocationCountField = new CIntField(type.getCIntegerField("_interpreter_invocation_count"), 0); 68 69 /* 70 interpreterEntry = type.getAddressField("_interpreter_entry"); 71 fromCompiledCodeEntryPoint = type.getAddressField("_from_compiled_code_entry_point"); 72 73 */ 74 objectInitializerName = null; 75 classInitializerName = null; 76 } 77 78 Method(OopHandle handle, ObjectHeap heap) { 79 super(handle, heap); 80 } 81 82 public boolean isMethod() { return true; } 83 84 // Fields 85 private static OopField constMethod; 86 private static OopField constants; 87 private static OopField methodData; 88 private static CIntField methodSize; 89 private static CIntField maxStack; 90 private static CIntField maxLocals; 91 private static CIntField sizeOfParameters; 92 private static CIntField accessFlags; 93 private static CIntField vtableIndex; 94 private static CIntField invocationCounter; 95 private static CIntField backedgeCounter; 96 private static long bytecodeOffset; 97 98 private static AddressField code; 99 100 private static CIntField interpreterThrowoutCountField; 101 private static CIntField interpreterInvocationCountField; 102 103 // constant method names - <init>, <clinit> 104 // Initialized lazily to avoid initialization ordering dependencies between Method and SymbolTable 105 private static Symbol objectInitializerName; 106 private static Symbol classInitializerName; 107 private static Symbol objectInitializerName() { 108 if (objectInitializerName == null) { 109 objectInitializerName = VM.getVM().getSymbolTable().probe("<init>"); 110 } 111 return objectInitializerName; 112 } 113 private static Symbol classInitializerName() { 114 if (classInitializerName == null) { 115 classInitializerName = VM.getVM().getSymbolTable().probe("<clinit>"); 116 } 117 return classInitializerName; 118 } 119 120 121 /* 122 private static AddressCField interpreterEntry; 123 private static AddressCField fromCompiledCodeEntryPoint; 124 */ 125 126 // Accessors for declared fields 127 public ConstMethod getConstMethod() { return (ConstMethod) constMethod.getValue(this); } 128 public ConstantPool getConstants() { return (ConstantPool) constants.getValue(this); } 129 public MethodData getMethodData() { return (MethodData) methodData.getValue(this); } 130 /** WARNING: this is in words, not useful in this system; use getObjectSize() instead */ 131 public long getMethodSize() { return methodSize.getValue(this); } 132 public long getMaxStack() { return maxStack.getValue(this); } 133 public long getMaxLocals() { return maxLocals.getValue(this); } 134 public long getSizeOfParameters() { return sizeOfParameters.getValue(this); } 135 public long getNameIndex() { return getConstMethod().getNameIndex(); } 136 public long getSignatureIndex() { return getConstMethod().getSignatureIndex(); } 137 public long getGenericSignatureIndex() { return getConstMethod().getGenericSignatureIndex(); } 138 public long getAccessFlags() { return accessFlags.getValue(this); } 139 public long getCodeSize() { return getConstMethod().getCodeSize(); } 140 public long getVtableIndex() { return vtableIndex.getValue(this); } 141 public long getInvocationCounter() { 142 if (Assert.ASSERTS_ENABLED) { 143 Assert.that(!VM.getVM().isCore(), "must not be used in core build"); 144 } 145 return invocationCounter.getValue(this); 146 } 147 public long getBackedgeCounter() { 148 if (Assert.ASSERTS_ENABLED) { 149 Assert.that(!VM.getVM().isCore(), "must not be used in core build"); 150 } 151 return backedgeCounter.getValue(this); 152 } 153 154 // get associated compiled native method, if available, else return null. 155 public NMethod getNativeMethod() { 156 Address addr = code.getValue(getHandle()); 157 return (NMethod) VMObjectFactory.newObject(NMethod.class, addr); 158 } 159 160 // Convenience routine 161 public AccessFlags getAccessFlagsObj() { 162 return new AccessFlags(getAccessFlags()); 163 } 164 165 /** Get a bytecode or breakpoint at the given bci */ 166 public int getBytecodeOrBPAt(int bci) { 167 return getConstMethod().getBytecodeOrBPAt(bci); 168 } 169 170 /** Fetch the original non-breakpoint bytecode at the specified 171 bci. It is required that there is currently a bytecode at this 172 bci. */ 173 public int getOrigBytecodeAt(int bci) { 174 BreakpointInfo bp = ((InstanceKlass) getMethodHolder()).getBreakpoints(); 175 for (; bp != null; bp = bp.getNext()) { 176 if (bp.match(this, bci)) { 177 return bp.getOrigBytecode(); 178 } 179 } 180 System.err.println("Requested bci " + bci); 181 for (; bp != null; bp = bp.getNext()) { 182 System.err.println("Breakpoint at bci " + bp.getBCI() + ", bytecode " + 183 bp.getOrigBytecode()); 184 } 185 Assert.that(false, "Should not reach here"); 186 return -1; // not reached 187 } 188 189 public byte getBytecodeByteArg(int bci) { 190 return getConstMethod().getBytecodeByteArg(bci); 191 } 192 193 /** Fetches a 16-bit big-endian ("Java ordered") value from the 194 bytecode stream */ 195 public short getBytecodeShortArg(int bci) { 196 return getConstMethod().getBytecodeShortArg(bci); 197 } 198 199 /** Fetches a 16-bit native ordered value from the 200 bytecode stream */ 201 public short getNativeShortArg(int bci) { 202 return getConstMethod().getNativeShortArg(bci); 203 } 204 205 /** Fetches a 32-bit big-endian ("Java ordered") value from the 206 bytecode stream */ 207 public int getBytecodeIntArg(int bci) { 208 return getConstMethod().getBytecodeIntArg(bci); 209 } 210 211 /** Fetches a 32-bit native ordered value from the 212 bytecode stream */ 213 public int getNativeIntArg(int bci) { 214 return getConstMethod().getNativeIntArg(bci); 215 } 216 217 public byte[] getByteCode() { 218 return getConstMethod().getByteCode(); 219 } 220 221 /* 222 public Address getCode() { return codeField.getValue(this); } 223 public Address getInterpreterEntry() { return interpreterEntryField.getValue(this); } 224 public Address getFromCompiledCodeEntryPoint() { return fromCompiledCodeEntryPointField.getValue(this); } 225 */ 226 // Accessors 227 public Symbol getName() { return getConstants().getSymbolAt(getNameIndex()); } 228 public Symbol getSignature() { return getConstants().getSymbolAt(getSignatureIndex()); } 229 public Symbol getGenericSignature() { 230 long index = getGenericSignatureIndex(); 231 return (index != 0L) ? getConstants().getSymbolAt(index) : null; 232 } 233 234 // Method holder (the Klass holding this method) 235 public Klass getMethodHolder() { return getConstants().getPoolHolder(); } 236 237 // Access flags 238 public boolean isPublic() { return getAccessFlagsObj().isPublic(); } 239 public boolean isPrivate() { return getAccessFlagsObj().isPrivate(); } 240 public boolean isProtected() { return getAccessFlagsObj().isProtected(); } 241 public boolean isPackagePrivate() { AccessFlags af = getAccessFlagsObj(); 242 return (!af.isPublic() && !af.isPrivate() && !af.isProtected()); } 243 public boolean isStatic() { return getAccessFlagsObj().isStatic(); } 244 public boolean isFinal() { return getAccessFlagsObj().isFinal(); } 245 public boolean isSynchronized() { return getAccessFlagsObj().isSynchronized(); } 246 public boolean isBridge() { return getAccessFlagsObj().isBridge(); } 247 public boolean isVarArgs() { return getAccessFlagsObj().isVarArgs(); } 248 public boolean isNative() { return getAccessFlagsObj().isNative(); } 249 public boolean isAbstract() { return getAccessFlagsObj().isAbstract(); } 250 public boolean isStrict() { return getAccessFlagsObj().isStrict(); } 251 public boolean isSynthetic() { return getAccessFlagsObj().isSynthetic(); } 252 253 public boolean isConstructor() { 254 return (!isStatic()) && getName().equals(objectInitializerName()); 255 } 256 257 public boolean isStaticInitializer() { 258 return isStatic() && getName().equals(classInitializerName()); 259 } 260 261 public boolean isObsolete() { 262 return getAccessFlagsObj().isObsolete(); 263 } 264 265 public OopMapCacheEntry getMaskFor(int bci) { 266 OopMapCacheEntry entry = new OopMapCacheEntry(); 267 entry.fill(this, bci); 268 return entry; 269 } 270 271 public long getObjectSize() { 272 return getMethodSize() * getHeap().getOopSize(); 273 } 274 275 public void printValueOn(PrintStream tty) { 276 tty.print("Method " + getName().asString() + getSignature().asString() + "@" + getHandle()); 277 } 278 279 public void iterateFields(OopVisitor visitor, boolean doVMFields) { 280 super.iterateFields(visitor, doVMFields); 281 if (doVMFields) { 282 visitor.doOop(constMethod, true); 283 visitor.doOop(constants, true); 284 visitor.doCInt(methodSize, true); 285 visitor.doCInt(maxStack, true); 286 visitor.doCInt(maxLocals, true); 287 visitor.doCInt(sizeOfParameters, true); 288 visitor.doCInt(accessFlags, true); 289 } 290 } 291 292 public boolean hasLineNumberTable() { 293 return getConstMethod().hasLineNumberTable(); 294 } 295 296 public int getLineNumberFromBCI(int bci) { 297 return getConstMethod().getLineNumberFromBCI(bci); 298 } 299 300 public LineNumberTableElement[] getLineNumberTable() { 301 return getConstMethod().getLineNumberTable(); 302 } 303 304 public boolean hasLocalVariableTable() { 305 return getConstMethod().hasLocalVariableTable(); 306 } 307 308 /** Should only be called if table is present */ 309 public LocalVariableTableElement[] getLocalVariableTable() { 310 return getConstMethod().getLocalVariableTable(); 311 } 312 313 public Symbol getLocalVariableName(int bci, int slot) { 314 if (! hasLocalVariableTable()) { 315 return null; 316 } 317 318 LocalVariableTableElement[] locals = getLocalVariableTable(); 319 for (int l = 0; l < locals.length; l++) { 320 LocalVariableTableElement local = locals[l]; 321 if ((bci >= local.getStartBCI()) && 322 (bci < (local.getStartBCI() + local.getLength())) && 323 slot == local.getSlot()) { 324 return getConstants().getSymbolAt(local.getNameCPIndex()); 325 } 326 } 327 328 return null; 329 } 330 331 public boolean hasExceptionTable() { 332 return getConstMethod().hasExceptionTable(); 333 } 334 335 public ExceptionTableElement[] getExceptionTable() { 336 return getConstMethod().getExceptionTable(); 337 } 338 339 public boolean hasCheckedExceptions() { 340 return getConstMethod().hasCheckedExceptions(); 341 } 342 343 /** Should only be called if table is present */ 344 public CheckedExceptionElement[] getCheckedExceptions() { 345 return getConstMethod().getCheckedExceptions(); 346 } 347 348 /** Returns name and signature in external form for debugging 349 purposes */ 350 public String externalNameAndSignature() { 351 final StringBuffer buf = new StringBuffer(); 352 buf.append(getMethodHolder().getName().asString()); 353 buf.append("."); 354 buf.append(getName().asString()); 355 buf.append("("); 356 new SignatureConverter(getSignature(), buf).iterateParameters(); 357 buf.append(")"); 358 return buf.toString().replace('/', '.'); 359 } 360 public int interpreterThrowoutCount() { 361 return (int) interpreterThrowoutCountField.getValue(getHandle()); 362 } 363 364 public int interpreterInvocationCount() { 365 return (int) interpreterInvocationCountField.getValue(getHandle()); 366 } 367 }