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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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package jdk.vm.ci.meta;

import java.lang.reflect.Constructor;
import java.lang.reflect.Executable;
import java.lang.reflect.Field;
import java.lang.reflect.Method;

Provides access to the metadata of a class typically provided in a class file.
/** * Provides access to the metadata of a class typically provided in a class file. */
public interface MetaAccessProvider {
Returns the resolved Java type representing a given Java class.
Params:
  • clazz – the Java class object
Returns:the resolved Java type object
/** * Returns the resolved Java type representing a given Java class. * * @param clazz the Java class object * @return the resolved Java type object */
ResolvedJavaType lookupJavaType(Class<?> clazz);
Returns the resolved Java types representing some given Java classes.
Params:
  • classes – the Java class objects
Returns:the resolved Java type objects
/** * Returns the resolved Java types representing some given Java classes. * * @param classes the Java class objects * @return the resolved Java type objects */
default ResolvedJavaType[] lookupJavaTypes(Class<?>[] classes) { ResolvedJavaType[] result = new ResolvedJavaType[classes.length]; for (int i = 0; i < result.length; i++) { result[i] = lookupJavaType(classes[i]); } return result; }
Provides the ResolvedJavaMethod for a Method or Constructor obtained via reflection.
/** * Provides the {@link ResolvedJavaMethod} for a {@link Method} or {@link Constructor} obtained * via reflection. */
ResolvedJavaMethod lookupJavaMethod(Executable reflectionMethod);
Provides the ResolvedJavaField for a Field obtained via reflection.
/** * Provides the {@link ResolvedJavaField} for a {@link Field} obtained via reflection. */
ResolvedJavaField lookupJavaField(Field reflectionField);
Returns the resolved Java type of the given JavaConstant object.
Returns:null if constant.isNull() || !constant.kind.isObject()
/** * Returns the resolved Java type of the given {@link JavaConstant} object. * * @return {@code null} if {@code constant.isNull() || !constant.kind.isObject()} */
ResolvedJavaType lookupJavaType(JavaConstant constant);
Returns the number of bytes occupied by this constant value or constant object.
Params:
  • constant – the constant whose bytes should be measured
Returns:the number of bytes occupied by this constant
/** * Returns the number of bytes occupied by this constant value or constant object. * * @param constant the constant whose bytes should be measured * @return the number of bytes occupied by this constant */
long getMemorySize(JavaConstant constant);
Parses a method descriptor into a Signature. The behavior of this method is undefined if the method descriptor is not well formed.
/** * Parses a * <a href="http://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.3.3">method * descriptor</a> into a {@link Signature}. The behavior of this method is undefined if the * method descriptor is not well formed. */
Signature parseMethodDescriptor(String methodDescriptor);
Encodes a deoptimization action and a deoptimization reason in an integer value.
Params:
  • debugId – an integer that can be used to track the origin of a deoptimization at runtime. There is no guarantee that the runtime will use this value. The runtime may even keep fewer than 32 bits.
Returns:the encoded value as an integer
/** * Encodes a deoptimization action and a deoptimization reason in an integer value. * * @param debugId an integer that can be used to track the origin of a deoptimization at * runtime. There is no guarantee that the runtime will use this value. The runtime * may even keep fewer than 32 bits. * * @return the encoded value as an integer */
JavaConstant encodeDeoptActionAndReason(DeoptimizationAction action, DeoptimizationReason reason, int debugId); DeoptimizationReason decodeDeoptReason(JavaConstant constant); DeoptimizationAction decodeDeoptAction(JavaConstant constant); int decodeDebugId(JavaConstant constant); }