| /* |
| * Copyright (c) 2009, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * 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). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package jdk.vm.ci.meta; |
| |
| /** |
| * Represents a method signature provided by the runtime. |
| * |
| * @see <a href="http://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.3.3">Method |
| * Descriptors</a> |
| */ |
| public interface Signature { |
| |
| /** |
| * Returns the number of parameters in this signature, adding 1 for a receiver if requested. |
| * |
| * @param receiver true if 1 is to be added to the result for a receiver |
| * @return the number of parameters; + 1 iff {@code receiver == true} |
| */ |
| int getParameterCount(boolean receiver); |
| |
| /** |
| * Gets the parameter type at the specified position. |
| * |
| * @param index the index into the parameters, with {@code 0} indicating the first parameter |
| * @param accessingClass the context of the type lookup. If non-null, its class loader is used |
| * for resolving the type. If {@code null}, then the type returned is either |
| * unresolved or a resolved type whose resolution is context free (e.g., a primitive |
| * type or a type in a java.* package). |
| * @return the {@code index}'th parameter type |
| * @throws LinkageError if {@code accessingClass != null} and resolution fails |
| * |
| */ |
| JavaType getParameterType(int index, ResolvedJavaType accessingClass); |
| |
| /** |
| * Gets the parameter kind at the specified position. This is the same as calling |
| * {@link #getParameterType}. {@link JavaType#getJavaKind getJavaKind}. |
| * |
| * @param index the index into the parameters, with {@code 0} indicating the first parameter |
| * @return the kind of the parameter at the specified position |
| */ |
| default JavaKind getParameterKind(int index) { |
| return getParameterType(index, null).getJavaKind(); |
| } |
| |
| /** |
| * Gets the return type of this signature. |
| * |
| * @param accessingClass the context of the type lookup. If non-null, its class loader is used |
| * for resolving the type. If {@code null}, then the type returned is either |
| * unresolved or a resolved type whose resolution is context free (e.g., a primitive |
| * type or a type in a java.* package). |
| * @return the return type |
| * @throws LinkageError if {@code accessingClass != null} and resolution fails |
| */ |
| JavaType getReturnType(ResolvedJavaType accessingClass); |
| |
| /** |
| * Gets the return kind of this signature. This is the same as calling {@link #getReturnType}. |
| * {@link JavaType#getJavaKind getJavaKind}. |
| */ |
| default JavaKind getReturnKind() { |
| return getReturnType(null).getJavaKind(); |
| } |
| |
| /** |
| * Gets the |
| * <a href="http://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.3.3">method |
| * descriptor</a> corresponding to this signature. For example: |
| * |
| * <pre> |
| * (ILjava/lang/String;D)V |
| * </pre> |
| * |
| * @return the signature as a string |
| */ |
| default String toMethodDescriptor() { |
| StringBuilder sb = new StringBuilder("("); |
| for (int i = 0; i < getParameterCount(false); ++i) { |
| sb.append(getParameterType(i, null).getName()); |
| } |
| sb.append(')').append(getReturnType(null).getName()); |
| return sb.toString(); |
| } |
| |
| default JavaType[] toParameterTypes(JavaType receiverType) { |
| int args = getParameterCount(false); |
| JavaType[] result; |
| int i = 0; |
| if (receiverType != null) { |
| result = new JavaType[args + 1]; |
| result[0] = receiverType; |
| i = 1; |
| } else { |
| result = new JavaType[args]; |
| } |
| for (int j = 0; j < args; j++) { |
| result[i + j] = getParameterType(j, null); |
| } |
| return result; |
| } |
| |
| default JavaKind[] toParameterKinds(boolean receiver) { |
| int args = getParameterCount(false); |
| JavaKind[] result; |
| int i = 0; |
| if (receiver) { |
| result = new JavaKind[args + 1]; |
| result[0] = JavaKind.Object; |
| i = 1; |
| } else { |
| result = new JavaKind[args]; |
| } |
| for (int j = 0; j < args; j++) { |
| result[i + j] = getParameterKind(j); |
| } |
| return result; |
| } |
| } |