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/*
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* Copyright (c) 2009, 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.vm.ci.meta;
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/**
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* Represents a method signature provided by the runtime.
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*
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* @see <a href="http://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.3.3">Method
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* Descriptors</a>
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*/
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public interface Signature {
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/**
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* Returns the number of parameters in this signature, adding 1 for a receiver if requested.
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*
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* @param receiver true if 1 is to be added to the result for a receiver
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* @return the number of parameters; + 1 iff {@code receiver == true}
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*/
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int getParameterCount(boolean receiver);
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/**
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* Gets the parameter type at the specified position.
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*
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* @param index the index into the parameters, with {@code 0} indicating the first parameter
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* @param accessingClass the context of the type lookup. If non-null, its class loader is used
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* for resolving the type. If {@code null}, then the type returned is either
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* unresolved or a resolved type whose resolution is context free (e.g., a primitive
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* type or a type in a java.* package).
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* @return the {@code index}'th parameter type
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* @throws LinkageError if {@code accessingClass != null} and resolution fails
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*
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*/
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JavaType getParameterType(int index, ResolvedJavaType accessingClass);
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/**
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* Gets the parameter kind at the specified position. This is the same as calling
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* {@link #getParameterType}. {@link JavaType#getJavaKind getJavaKind}.
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*
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* @param index the index into the parameters, with {@code 0} indicating the first parameter
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* @return the kind of the parameter at the specified position
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*/
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default JavaKind getParameterKind(int index) {
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return getParameterType(index, null).getJavaKind();
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}
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/**
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* Gets the return type of this signature.
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*
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* @param accessingClass the context of the type lookup. If non-null, its class loader is used
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* for resolving the type. If {@code null}, then the type returned is either
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* unresolved or a resolved type whose resolution is context free (e.g., a primitive
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* type or a type in a java.* package).
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* @return the return type
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* @throws LinkageError if {@code accessingClass != null} and resolution fails
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*/
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JavaType getReturnType(ResolvedJavaType accessingClass);
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/**
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* Gets the return kind of this signature. This is the same as calling {@link #getReturnType}.
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* {@link JavaType#getJavaKind getJavaKind}.
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*/
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default JavaKind getReturnKind() {
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return getReturnType(null).getJavaKind();
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}
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/**
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* Gets the
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* <a href="http://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.3.3">method
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* descriptor</a> corresponding to this signature. For example:
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*
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* <pre>
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* (ILjava/lang/String;D)V
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* </pre>
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*
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* @return the signature as a string
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*/
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default String toMethodDescriptor() {
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StringBuilder sb = new StringBuilder("(");
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for (int i = 0; i < getParameterCount(false); ++i) {
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sb.append(getParameterType(i, null).getName());
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}
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sb.append(')').append(getReturnType(null).getName());
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return sb.toString();
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}
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default JavaType[] toParameterTypes(JavaType receiverType) {
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int args = getParameterCount(false);
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JavaType[] result;
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int i = 0;
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if (receiverType != null) {
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result = new JavaType[args + 1];
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result[0] = receiverType;
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i = 1;
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} else {
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result = new JavaType[args];
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}
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for (int j = 0; j < args; j++) {
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result[i + j] = getParameterType(j, null);
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}
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return result;
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}
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default JavaKind[] toParameterKinds(boolean receiver) {
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int args = getParameterCount(false);
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JavaKind[] result;
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int i = 0;
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if (receiver) {
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result = new JavaKind[args + 1];
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result[0] = JavaKind.Object;
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i = 1;
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} else {
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result = new JavaKind[args];
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}
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for (int j = 0; j < args; j++) {
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result[i + j] = getParameterKind(j);
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}
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return result;
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}
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}
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