author | vromero |
Wed, 09 Jan 2019 08:07:23 -0500 | |
changeset 53224 | bae765528fcc |
parent 52914 | 4fa75d8ad418 |
permissions | -rw-r--r-- |
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/* |
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bae765528fcc
8215510: j.l.c.ClassDesc is accepting descriptors not allowed by the spec
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parents:
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changeset
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* Copyright (c) 2018, 2019, 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. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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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 java.lang.constant; |
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import java.lang.invoke.MethodHandle; |
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import java.lang.invoke.MethodHandles; |
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import java.lang.invoke.MethodType; |
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import java.util.Objects; |
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import static java.lang.constant.ConstantDescs.CD_void; |
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import static java.lang.constant.ConstantUtils.validateClassOrInterface; |
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import static java.lang.constant.ConstantUtils.validateMemberName; |
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import static java.lang.constant.DirectMethodHandleDesc.Kind.CONSTRUCTOR; |
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import static java.util.Objects.requireNonNull; |
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/** |
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* A <a href="package-summary.html#nominal">nominal descriptor</a> for a direct |
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* {@link MethodHandle}. A {@linkplain DirectMethodHandleDescImpl} corresponds to |
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* a {@code Constant_MethodHandle_info} entry in the constant pool of a classfile. |
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*/ |
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final class DirectMethodHandleDescImpl implements DirectMethodHandleDesc { |
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private final Kind kind; |
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private final ClassDesc owner; |
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private final String name; |
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private final MethodTypeDesc invocationType; |
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/** |
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* Constructs a {@linkplain DirectMethodHandleDescImpl} for a method or field |
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* from a kind, owner, name, and type |
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* |
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* @param kind the kind of the method handle |
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* @param owner the declaring class or interface for the method |
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* @param name the unqualified name of the method (ignored if {@code kind} is {@code CONSTRUCTOR}) |
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* @param type the lookup type of the method |
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* @throws NullPointerException if any non-ignored argument is null |
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* @throws IllegalArgumentException if {@code kind} describes a field accessor, |
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* and {@code type} is not consistent with that kind of field accessor, or if |
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* {@code kind} describes a constructor, and the return type of {@code type} |
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* is not {@code void} |
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* @jvms 4.2.2 Unqualified Names |
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*/ |
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DirectMethodHandleDescImpl(Kind kind, ClassDesc owner, String name, MethodTypeDesc type) { |
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if (kind == CONSTRUCTOR) |
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name = "<init>"; |
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requireNonNull(kind); |
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validateClassOrInterface(requireNonNull(owner)); |
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53224
bae765528fcc
8215510: j.l.c.ClassDesc is accepting descriptors not allowed by the spec
vromero
parents:
52914
diff
changeset
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validateMemberName(requireNonNull(name), true); |
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requireNonNull(type); |
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switch (kind) { |
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case CONSTRUCTOR: validateConstructor(type); break; |
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case GETTER: validateFieldType(type, false, true); break; |
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case SETTER: validateFieldType(type, true, true); break; |
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case STATIC_GETTER: validateFieldType(type, false, false); break; |
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case STATIC_SETTER: validateFieldType(type, true, false); break; |
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} |
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this.kind = kind; |
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this.owner = owner; |
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this.name = name; |
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if (kind.isVirtualMethod()) |
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this.invocationType = type.insertParameterTypes(0, owner); |
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else if (kind == CONSTRUCTOR) |
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this.invocationType = type.changeReturnType(owner); |
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else |
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this.invocationType = type; |
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} |
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private static void validateFieldType(MethodTypeDesc type, boolean isSetter, boolean isVirtual) { |
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boolean isVoid = type.returnType().descriptorString().equals("V"); |
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int expectedParams = (isSetter ? 1 : 0) + (isVirtual ? 1 : 0); |
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if (isVoid != isSetter |
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|| type.parameterCount() != expectedParams |
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|| (isVirtual && type.parameterType(0).isPrimitive())) { |
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String expectedType = String.format("(%s%s)%s", (isVirtual ? "R" : ""), |
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(isSetter ? "T" : ""), (isSetter ? "V" : "T")); |
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throw new IllegalArgumentException(String.format("Expected type of %s for getter, found %s", expectedType, type)); |
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} |
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} |
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private static void validateConstructor(MethodTypeDesc type) { |
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if (!type.returnType().descriptorString().equals("V")) { |
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throw new IllegalArgumentException(String.format("Expected type of (T*)V for constructor, found %s", type)); |
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} |
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} |
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@Override |
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public Kind kind() { return kind; } |
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@Override |
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public int refKind() { return kind.refKind; } |
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@Override |
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public boolean isOwnerInterface() { return kind.isInterface; } |
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@Override |
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public ClassDesc owner() { |
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return owner; |
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} |
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@Override |
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public String methodName() { |
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return name; |
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} |
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@Override |
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public MethodTypeDesc invocationType() { |
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return invocationType; |
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} |
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@Override |
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public String lookupDescriptor() { |
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switch (kind) { |
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case VIRTUAL: |
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case SPECIAL: |
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case INTERFACE_VIRTUAL: |
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case INTERFACE_SPECIAL: |
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return invocationType.dropParameterTypes(0, 1).descriptorString(); |
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case STATIC: |
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case INTERFACE_STATIC: |
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return invocationType.descriptorString(); |
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case CONSTRUCTOR: |
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return invocationType.changeReturnType(CD_void).descriptorString(); |
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case GETTER: |
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case STATIC_GETTER: |
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return invocationType.returnType().descriptorString(); |
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case SETTER: |
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return invocationType.parameterType(1).descriptorString(); |
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case STATIC_SETTER: |
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return invocationType.parameterType(0).descriptorString(); |
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default: |
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throw new IllegalStateException(kind.toString()); |
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} |
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} |
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public MethodHandle resolveConstantDesc(MethodHandles.Lookup lookup) |
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throws ReflectiveOperationException { |
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Class<?> resolvedOwner = (Class<?>) owner.resolveConstantDesc(lookup); |
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MethodType invocationType = (MethodType) this.invocationType().resolveConstantDesc(lookup); |
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switch (kind) { |
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case STATIC: |
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case INTERFACE_STATIC: |
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return lookup.findStatic(resolvedOwner, name, invocationType); |
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case INTERFACE_VIRTUAL: |
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case VIRTUAL: |
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return lookup.findVirtual(resolvedOwner, name, invocationType.dropParameterTypes(0, 1)); |
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case SPECIAL: |
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case INTERFACE_SPECIAL: |
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return lookup.findSpecial(resolvedOwner, name, invocationType.dropParameterTypes(0, 1), |
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lookup.lookupClass()); |
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case CONSTRUCTOR: |
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return lookup.findConstructor(resolvedOwner, invocationType.changeReturnType(void.class)); |
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case GETTER: |
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return lookup.findGetter(resolvedOwner, name, invocationType.returnType()); |
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case STATIC_GETTER: |
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return lookup.findStaticGetter(resolvedOwner, name, invocationType.returnType()); |
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case SETTER: |
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return lookup.findSetter(resolvedOwner, name, invocationType.parameterType(1)); |
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case STATIC_SETTER: |
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return lookup.findStaticSetter(resolvedOwner, name, invocationType.parameterType(0)); |
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default: |
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throw new IllegalStateException(kind.name()); |
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} |
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} |
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/** |
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* Returns {@code true} if this {@linkplain DirectMethodHandleDescImpl} is |
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* equal to another {@linkplain DirectMethodHandleDescImpl}. Equality is |
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* determined by the two descriptors having equal kind, owner, name, and type |
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* descriptor. |
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* @param o a {@code DirectMethodHandleDescImpl} to compare to this |
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* {@code DirectMethodHandleDescImpl} |
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* @return {@code true} if the specified {@code DirectMethodHandleDescImpl} is |
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* equals to this {@code DirectMethodHandleDescImpl}. |
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*/ |
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@Override |
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public boolean equals(Object o) { |
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if (this == o) return true; |
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if (o == null || getClass() != o.getClass()) return false; |
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DirectMethodHandleDescImpl desc = (DirectMethodHandleDescImpl) o; |
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return kind == desc.kind && |
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Objects.equals(owner, desc.owner) && |
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Objects.equals(name, desc.name) && |
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Objects.equals(invocationType, desc.invocationType); |
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} |
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@Override |
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public int hashCode() { |
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return Objects.hash(kind, owner, name, invocationType); |
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} |
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@Override |
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public String toString() { |
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return String.format("MethodHandleDesc[%s/%s::%s%s]", kind, owner.displayName(), name, invocationType.displayDescriptor()); |
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} |
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} |