1 /*
2 * Copyright (c) 2009, 2014, 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 package jdk.vm.ci.meta;
24
25 import java.lang.annotation.Annotation;
26 import java.lang.invoke.MethodHandle;
27 import java.lang.reflect.Array;
28 import java.lang.reflect.Method;
29 import java.lang.reflect.Modifier;
30 import java.lang.reflect.Type;
31
32 /**
33 * Represents a resolved Java method. Methods, like fields and types, are resolved through
34 * {@link ConstantPool constant pools}.
35 */
36 public interface ResolvedJavaMethod extends JavaMethod, InvokeTarget, ModifiersProvider {
37
38 /**
39 * Returns the bytecode of this method, if the method has code. The returned byte array does not
40 * contain breakpoints or non-Java bytecodes. This may return null if the
41 * {@link #getDeclaringClass() holder} is not {@link ResolvedJavaType#isLinked() linked}.
42 *
43 * The contained constant pool indices may not be the ones found in the original class file but
44 * they can be used with the JVMCI API (e.g. methods in {@link ConstantPool}).
45 *
46 * @return the bytecode of the method, or {@code null} if {@code getCodeSize() == 0} or if the
47 * code is not ready.
48 */
49 byte[] getCode();
50
51 /**
52 * Returns the size of the bytecode of this method, if the method has code. This is equivalent
53 * to {@link #getCode()}. {@code length} if the method has code.
54 *
55 * @return the size of the bytecode in bytes, or 0 if no bytecode is available
56 */
57 int getCodeSize();
58
59 /**
60 * Returns the {@link ResolvedJavaType} object representing the class or interface that declares
61 * this method.
62 */
63 ResolvedJavaType getDeclaringClass();
64
65 /**
66 * Returns the maximum number of locals used in this method's bytecodes.
67 */
68 int getMaxLocals();
69
70 /**
71 * Returns the maximum number of stack slots used in this method's bytecodes.
72 */
73 int getMaxStackSize();
74
75 /**
76 * {@inheritDoc}
77 * <p>
78 * Only the {@linkplain Modifier#methodModifiers() method flags} specified in the JVM
79 * specification will be included in the returned mask.
80 */
81 int getModifiers();
82
83 default boolean isFinal() {
84 return ModifiersProvider.super.isFinalFlagSet();
85 }
86
87 /**
88 * Determines if this method is a synthetic method as defined by the Java Language
89 * Specification.
90 */
91 default boolean isSynthetic() {
92 return (SYNTHETIC & getModifiers()) == SYNTHETIC;
93 }
94
95 /**
96 * Checks that the method is a <a
97 * href="http://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.6">varargs</a>
98 * method.
99 *
100 * @return whether the method is a varargs method
101 */
102 default boolean isVarArgs() {
103 return (VARARGS & getModifiers()) == VARARGS;
104 }
105
106 /**
107 * Checks that the method is a <a
108 * href="http://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.6">bridge</a>
109 * method.
110 *
111 * @return whether the method is a bridge method
112 */
113 default boolean isBridge() {
114 return (BRIDGE & getModifiers()) == BRIDGE;
115 }
116
117 /**
118 * Returns {@code true} if this method is a default method; returns {@code false} otherwise.
119 *
120 * A default method is a public non-abstract instance method, that is, a non-static method with
121 * a body, declared in an interface type.
122 *
123 * @return true if and only if this method is a default method as defined by the Java Language
124 * Specification.
125 */
126 boolean isDefault();
127
128 /**
129 * Checks whether this method is a class initializer.
130 *
131 * @return {@code true} if the method is a class initializer
132 */
133 boolean isClassInitializer();
134
135 /**
136 * Checks whether this method is a constructor.
137 *
138 * @return {@code true} if the method is a constructor
139 */
140 boolean isConstructor();
141
142 /**
143 * Checks whether this method can be statically bound (usually, that means it is final or
144 * private or static, but not abstract, or the declaring class is final).
145 *
146 * @return {@code true} if this method can be statically bound
147 */
148 boolean canBeStaticallyBound();
149
150 /**
151 * Returns the list of exception handlers for this method.
152 */
153 ExceptionHandler[] getExceptionHandlers();
154
155 /**
156 * Returns a stack trace element for this method and a given bytecode index.
157 */
158 StackTraceElement asStackTraceElement(int bci);
159
160 /**
161 * Returns an object that provides access to the profiling information recorded for this method.
162 */
163 default ProfilingInfo getProfilingInfo() {
164 return getProfilingInfo(true, true);
165 }
166
167 /**
168 * Returns an object that provides access to the profiling information recorded for this method.
169 *
170 * @param includeNormal if true,
171 * {@linkplain ProfilingInfo#getDeoptimizationCount(DeoptimizationReason)
172 * deoptimization counts} will include deoptimization that happened during execution
173 * of standard non-osr methods.
174 * @param includeOSR if true,
175 * {@linkplain ProfilingInfo#getDeoptimizationCount(DeoptimizationReason)
176 * deoptimization counts} will include deoptimization that happened during execution
177 * of on-stack-replacement methods.
178 */
179 ProfilingInfo getProfilingInfo(boolean includeNormal, boolean includeOSR);
180
181 /**
182 * Invalidates the profiling information and restarts profiling upon the next invocation.
183 */
184 void reprofile();
185
186 /**
187 * Returns the constant pool of this method.
188 */
189 ConstantPool getConstantPool();
190
191 /**
192 * Returns all annotations of this method. If no annotations are present, an array of length 0
193 * is returned.
194 */
195 Annotation[] getAnnotations();
196
197 /**
198 * Returns the annotation for the specified type of this method, if such an annotation is
199 * present.
200 *
201 * @param annotationClass the Class object corresponding to the annotation type
202 * @return this element's annotation for the specified annotation type if present on this
203 * method, else {@code null}
204 */
205 <T extends Annotation> T getAnnotation(Class<T> annotationClass);
206
207 /**
208 * Returns an array of arrays that represent the annotations on the formal parameters, in
209 * declaration order, of this method.
210 *
211 * @see Method#getParameterAnnotations()
212 */
213 Annotation[][] getParameterAnnotations();
214
215 /**
216 * Returns an array of {@link Type} objects that represent the formal parameter types, in
217 * declaration order, of this method.
218 *
219 * @see Method#getGenericParameterTypes()
220 */
221 Type[] getGenericParameterTypes();
222
223 /**
224 * Returns {@code true} if this method is not excluded from inlining and has associated Java
225 * bytecodes (@see {@link ResolvedJavaMethod#hasBytecodes()}).
226 */
227 boolean canBeInlined();
228
229 /**
230 * Returns {@code true} if the inlining of this method should be forced.
231 */
232 boolean shouldBeInlined();
233
234 /**
235 * Returns the LineNumberTable of this method or null if this method does not have a line
236 * numbers table.
237 */
238 LineNumberTable getLineNumberTable();
239
240 /**
241 * Returns the local variable table of this method or null if this method does not have a local
242 * variable table.
243 */
244 LocalVariableTable getLocalVariableTable();
245
246 /**
247 * Invokes the underlying method represented by this object, on the specified object with the
248 * specified parameters. This method is similar to a reflective method invocation by
249 * {@link Method#invoke}.
250 *
251 * @param receiver The receiver for the invocation, or {@code null} if it is a static method.
252 * @param arguments The arguments for the invocation.
253 * @return The value returned by the method invocation, or {@code null} if the return type is
254 * {@code void}.
255 */
256 JavaConstant invoke(JavaConstant receiver, JavaConstant[] arguments);
257
258 /**
259 * Gets the encoding of (that is, a constant representing the value of) this method.
260 *
261 * @return a constant representing a reference to this method
262 */
263 Constant getEncoding();
264
265 /**
266 * Checks if this method is present in the virtual table for subtypes of the specified
267 * {@linkplain ResolvedJavaType type}.
268 *
269 * @return true is this method is present in the virtual table for subtypes of this type.
270 */
271 boolean isInVirtualMethodTable(ResolvedJavaType resolved);
272
273 /**
274 * Gets the annotation of a particular type for a formal parameter of this method.
275 *
276 * @param annotationClass the Class object corresponding to the annotation type
277 * @param parameterIndex the index of a formal parameter of {@code method}
278 * @return the annotation of type {@code annotationClass} for the formal parameter present, else
279 * null
280 * @throws IndexOutOfBoundsException if {@code parameterIndex} does not denote a formal
281 * parameter
282 */
283 default <T extends Annotation> T getParameterAnnotation(Class<T> annotationClass, int parameterIndex) {
284 if (parameterIndex >= 0) {
285 Annotation[][] parameterAnnotations = getParameterAnnotations();
286 for (Annotation a : parameterAnnotations[parameterIndex]) {
287 if (a.annotationType() == annotationClass) {
288 return annotationClass.cast(a);
289 }
290 }
291 }
292 return null;
293 }
294
295 default JavaType[] toParameterTypes() {
296 JavaType receiver = isStatic() || isConstructor() ? null : getDeclaringClass();
297 return getSignature().toParameterTypes(receiver);
298 }
299
300 /**
301 * Gets the annotations of a particular type for the formal parameters of this method.
302 *
303 * @param annotationClass the Class object corresponding to the annotation type
304 * @return the annotation of type {@code annotationClass} (if any) for each formal parameter
305 * present
306 */
307 @SuppressWarnings("unchecked")
308 default <T extends Annotation> T[] getParameterAnnotations(Class<T> annotationClass) {
309 Annotation[][] parameterAnnotations = getParameterAnnotations();
310 T[] result = (T[]) Array.newInstance(annotationClass, parameterAnnotations.length);
311 for (int i = 0; i < parameterAnnotations.length; i++) {
312 for (Annotation a : parameterAnnotations[i]) {
313 if (a.annotationType() == annotationClass) {
314 result[i] = annotationClass.cast(a);
315 }
316 }
317 }
318 return result;
319 }
320
321 /**
322 * Checks whether the method has bytecodes associated with it. Methods without bytecodes are
323 * either abstract or native methods.
324 *
325 * @return whether the definition of this method is Java bytecodes
326 */
327 default boolean hasBytecodes() {
328 return isConcrete() && !isNative();
329 }
330
331 /**
332 * Checks whether the method has a receiver parameter - i.e., whether it is not static.
333 *
334 * @return whether the method has a receiver parameter
335 */
336 default boolean hasReceiver() {
337 return !isStatic();
338 }
339
340 /**
341 * Determines if this method is {@link java.lang.Object#Object()}.
342 */
343 default boolean isJavaLangObjectInit() {
344 return getDeclaringClass().isJavaLangObject() && getName().equals("<init>");
345 }
346
347 SpeculationLog getSpeculationLog();
348
349 /**
350 * Determines if the method identified by its holder and name is a <a
351 * href="https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-2.html#jvms-2.9">signature
352 * polymorphic</a> method.
353 */
354 static boolean isSignaturePolymorphic(JavaType holder, String name, MetaAccessProvider metaAccess) {
355 if (!holder.getName().equals("Ljava/lang/invoke/MethodHandle;")) {
356 return false;
357 }
358 ResolvedJavaType methodHandleType = metaAccess.lookupJavaType(MethodHandle.class);
359 Signature signature = metaAccess.parseMethodDescriptor("([Ljava/lang/Object;)Ljava/lang/Object;");
360 ResolvedJavaMethod method = methodHandleType.findMethod(name, signature);
361 if (method == null) {
362 return false;
363 }
364 return method.isNative() && method.isVarArgs();
365 }
366 }