diff -r eca8e9c3ec3e -r cd50c1894ce5 rt/emul/compact/src/main/java/java/lang/invoke/MethodType.java
--- a/rt/emul/compact/src/main/java/java/lang/invoke/MethodType.java Sun Aug 17 20:09:05 2014 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,1149 +0,0 @@
-/*
- * Copyright (c) 2008, 2013, 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. Oracle designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the LICENSE file that accompanied this code.
- *
- * 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 java.lang.invoke;
-
-import sun.invoke.util.Wrapper;
-import java.lang.ref.WeakReference;
-import java.lang.ref.Reference;
-import java.lang.ref.ReferenceQueue;
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.List;
-import java.util.Objects;
-import java.util.concurrent.ConcurrentMap;
-import java.util.concurrent.ConcurrentHashMap;
-import sun.invoke.util.BytecodeDescriptor;
-import static java.lang.invoke.MethodHandleStatics.*;
-import sun.invoke.util.VerifyType;
-
-/**
- * A method type represents the arguments and return type accepted and
- * returned by a method handle, or the arguments and return type passed
- * and expected by a method handle caller. Method types must be properly
- * matched between a method handle and all its callers,
- * and the JVM's operations enforce this matching at, specifically
- * during calls to {@link MethodHandle#invokeExact MethodHandle.invokeExact}
- * and {@link MethodHandle#invoke MethodHandle.invoke}, and during execution
- * of {@code invokedynamic} instructions.
- *
- * The structure is a return type accompanied by any number of parameter types.
- * The types (primitive, {@code void}, and reference) are represented by {@link Class} objects.
- * (For ease of exposition, we treat {@code void} as if it were a type.
- * In fact, it denotes the absence of a return type.)
- *
- * All instances of {@code MethodType} are immutable.
- * Two instances are completely interchangeable if they compare equal.
- * Equality depends on pairwise correspondence of the return and parameter types and on nothing else.
- *
- * This type can be created only by factory methods.
- * All factory methods may cache values, though caching is not guaranteed.
- * Some factory methods are static, while others are virtual methods which
- * modify precursor method types, e.g., by changing a selected parameter.
- *
- * Factory methods which operate on groups of parameter types
- * are systematically presented in two versions, so that both Java arrays and
- * Java lists can be used to work with groups of parameter types.
- * The query methods {@code parameterArray} and {@code parameterList}
- * also provide a choice between arrays and lists.
- *
- * {@code MethodType} objects are sometimes derived from bytecode instructions
- * such as {@code invokedynamic}, specifically from the type descriptor strings associated
- * with the instructions in a class file's constant pool.
- *
- * Like classes and strings, method types can also be represented directly
- * in a class file's constant pool as constants.
- * A method type may be loaded by an {@code ldc} instruction which refers
- * to a suitable {@code CONSTANT_MethodType} constant pool entry.
- * The entry refers to a {@code CONSTANT_Utf8} spelling for the descriptor string.
- * (For full details on method type constants,
- * see sections 4.4.8 and 5.4.3.5 of the Java Virtual Machine Specification.)
- *
- * When the JVM materializes a {@code MethodType} from a descriptor string,
- * all classes named in the descriptor must be accessible, and will be loaded.
- * (But the classes need not be initialized, as is the case with a {@code CONSTANT_Class}.)
- * This loading may occur at any time before the {@code MethodType} object is first derived.
- * @author John Rose, JSR 292 EG
- */
-public final
-class MethodType implements java.io.Serializable {
- private static final long serialVersionUID = 292L; // {rtype, {ptype...}}
-
- // The rtype and ptypes fields define the structural identity of the method type:
- private final Class rtype;
- private final Class[] ptypes;
-
- // The remaining fields are caches of various sorts:
- private @Stable MethodTypeForm form; // erased form, plus cached data about primitives
- private @Stable MethodType wrapAlt; // alternative wrapped/unwrapped version
- private @Stable Invokers invokers; // cache of handy higher-order adapters
- private @Stable String methodDescriptor; // cache for toMethodDescriptorString
-
- /**
- * Check the given parameters for validity and store them into the final fields.
- */
- private MethodType(Class rtype, Class[] ptypes, boolean trusted) {
- checkRtype(rtype);
- checkPtypes(ptypes);
- this.rtype = rtype;
- // defensively copy the array passed in by the user
- this.ptypes = trusted ? ptypes : Arrays.copyOf(ptypes, ptypes.length);
- }
-
- /**
- * Construct a temporary unchecked instance of MethodType for use only as a key to the intern table.
- * Does not check the given parameters for validity, and must be discarded after it is used as a searching key.
- * The parameters are reversed for this constructor, so that is is not accidentally used.
- */
- private MethodType(Class[] ptypes, Class rtype) {
- this.rtype = rtype;
- this.ptypes = ptypes;
- }
-
- /*trusted*/ MethodTypeForm form() { return form; }
- /*trusted*/ Class rtype() { return rtype; }
- /*trusted*/ Class[] ptypes() { return ptypes; }
-
- void setForm(MethodTypeForm f) { form = f; }
-
- /** This number, mandated by the JVM spec as 255,
- * is the maximum number of slots
- * that any Java method can receive in its argument list.
- * It limits both JVM signatures and method type objects.
- * The longest possible invocation will look like
- * {@code staticMethod(arg1, arg2, ..., arg255)} or
- * {@code x.virtualMethod(arg1, arg2, ..., arg254)}.
- */
- /*non-public*/ static final int MAX_JVM_ARITY = 255; // this is mandated by the JVM spec.
-
- /** This number is the maximum arity of a method handle, 254.
- * It is derived from the absolute JVM-imposed arity by subtracting one,
- * which is the slot occupied by the method handle itself at the
- * beginning of the argument list used to invoke the method handle.
- * The longest possible invocation will look like
- * {@code mh.invoke(arg1, arg2, ..., arg254)}.
- */
- // Issue: Should we allow MH.invokeWithArguments to go to the full 255?
- /*non-public*/ static final int MAX_MH_ARITY = MAX_JVM_ARITY-1; // deduct one for mh receiver
-
- /** This number is the maximum arity of a method handle invoker, 253.
- * It is derived from the absolute JVM-imposed arity by subtracting two,
- * which are the slots occupied by invoke method handle, and the
- * target method handle, which are both at the beginning of the argument
- * list used to invoke the target method handle.
- * The longest possible invocation will look like
- * {@code invokermh.invoke(targetmh, arg1, arg2, ..., arg253)}.
- */
- /*non-public*/ static final int MAX_MH_INVOKER_ARITY = MAX_MH_ARITY-1; // deduct one more for invoker
-
- private static void checkRtype(Class rtype) {
- Objects.requireNonNull(rtype);
- }
- private static void checkPtype(Class ptype) {
- Objects.requireNonNull(ptype);
- if (ptype == void.class)
- throw newIllegalArgumentException("parameter type cannot be void");
- }
- /** Return number of extra slots (count of long/double args). */
- private static int checkPtypes(Class[] ptypes) {
- int slots = 0;
- for (Class ptype : ptypes) {
- checkPtype(ptype);
- if (ptype == double.class || ptype == long.class) {
- slots++;
- }
- }
- checkSlotCount(ptypes.length + slots);
- return slots;
- }
- static void checkSlotCount(int count) {
- assert((MAX_JVM_ARITY & (MAX_JVM_ARITY+1)) == 0);
- // MAX_JVM_ARITY must be power of 2 minus 1 for following code trick to work:
- if ((count & MAX_JVM_ARITY) != count)
- throw newIllegalArgumentException("bad parameter count "+count);
- }
- private static IndexOutOfBoundsException newIndexOutOfBoundsException(Object num) {
- if (num instanceof Integer) num = "bad index: "+num;
- return new IndexOutOfBoundsException(num.toString());
- }
-
- static final ConcurrentWeakInternSet internTable = new ConcurrentWeakInternSet<>();
-
- static final Class[] NO_PTYPES = {};
-
- /**
- * Finds or creates an instance of the given method type.
- * @param rtype the return type
- * @param ptypes the parameter types
- * @return a method type with the given components
- * @throws NullPointerException if {@code rtype} or {@code ptypes} or any element of {@code ptypes} is null
- * @throws IllegalArgumentException if any element of {@code ptypes} is {@code void.class}
- */
- public static
- MethodType methodType(Class rtype, Class[] ptypes) {
- return makeImpl(rtype, ptypes, false);
- }
-
- /**
- * Finds or creates a method type with the given components.
- * Convenience method for {@link #methodType(java.lang.Class, java.lang.Class[]) methodType}.
- * @param rtype the return type
- * @param ptypes the parameter types
- * @return a method type with the given components
- * @throws NullPointerException if {@code rtype} or {@code ptypes} or any element of {@code ptypes} is null
- * @throws IllegalArgumentException if any element of {@code ptypes} is {@code void.class}
- */
- public static
- MethodType methodType(Class rtype, List> ptypes) {
- boolean notrust = false; // random List impl. could return evil ptypes array
- return makeImpl(rtype, listToArray(ptypes), notrust);
- }
-
- private static Class[] listToArray(List> ptypes) {
- // sanity check the size before the toArray call, since size might be huge
- checkSlotCount(ptypes.size());
- return ptypes.toArray(NO_PTYPES);
- }
-
- /**
- * Finds or creates a method type with the given components.
- * Convenience method for {@link #methodType(java.lang.Class, java.lang.Class[]) methodType}.
- * The leading parameter type is prepended to the remaining array.
- * @param rtype the return type
- * @param ptype0 the first parameter type
- * @param ptypes the remaining parameter types
- * @return a method type with the given components
- * @throws NullPointerException if {@code rtype} or {@code ptype0} or {@code ptypes} or any element of {@code ptypes} is null
- * @throws IllegalArgumentException if {@code ptype0} or {@code ptypes} or any element of {@code ptypes} is {@code void.class}
- */
- public static
- MethodType methodType(Class rtype, Class ptype0, Class... ptypes) {
- Class[] ptypes1 = new Class[1+ptypes.length];
- ptypes1[0] = ptype0;
- System.arraycopy(ptypes, 0, ptypes1, 1, ptypes.length);
- return makeImpl(rtype, ptypes1, true);
- }
-
- /**
- * Finds or creates a method type with the given components.
- * Convenience method for {@link #methodType(java.lang.Class, java.lang.Class[]) methodType}.
- * The resulting method has no parameter types.
- * @param rtype the return type
- * @return a method type with the given return value
- * @throws NullPointerException if {@code rtype} is null
- */
- public static
- MethodType methodType(Class rtype) {
- return makeImpl(rtype, NO_PTYPES, true);
- }
-
- /**
- * Finds or creates a method type with the given components.
- * Convenience method for {@link #methodType(java.lang.Class, java.lang.Class[]) methodType}.
- * The resulting method has the single given parameter type.
- * @param rtype the return type
- * @param ptype0 the parameter type
- * @return a method type with the given return value and parameter type
- * @throws NullPointerException if {@code rtype} or {@code ptype0} is null
- * @throws IllegalArgumentException if {@code ptype0} is {@code void.class}
- */
- public static
- MethodType methodType(Class rtype, Class ptype0) {
- return makeImpl(rtype, new Class[]{ ptype0 }, true);
- }
-
- /**
- * Finds or creates a method type with the given components.
- * Convenience method for {@link #methodType(java.lang.Class, java.lang.Class[]) methodType}.
- * The resulting method has the same parameter types as {@code ptypes},
- * and the specified return type.
- * @param rtype the return type
- * @param ptypes the method type which supplies the parameter types
- * @return a method type with the given components
- * @throws NullPointerException if {@code rtype} or {@code ptypes} is null
- */
- public static
- MethodType methodType(Class rtype, MethodType ptypes) {
- return makeImpl(rtype, ptypes.ptypes, true);
- }
-
- /**
- * Sole factory method to find or create an interned method type.
- * @param rtype desired return type
- * @param ptypes desired parameter types
- * @param trusted whether the ptypes can be used without cloning
- * @return the unique method type of the desired structure
- */
- /*trusted*/ static
- MethodType makeImpl(Class rtype, Class[] ptypes, boolean trusted) {
- MethodType mt = internTable.get(new MethodType(ptypes, rtype));
- if (mt != null)
- return mt;
- if (ptypes.length == 0) {
- ptypes = NO_PTYPES; trusted = true;
- }
- mt = new MethodType(rtype, ptypes, trusted);
- // promote the object to the Real Thing, and reprobe
- mt.form = MethodTypeForm.findForm(mt);
- return internTable.add(mt);
- }
- private static final MethodType[] objectOnlyTypes = new MethodType[20];
-
- /**
- * Finds or creates a method type whose components are {@code Object} with an optional trailing {@code Object[]} array.
- * Convenience method for {@link #methodType(java.lang.Class, java.lang.Class[]) methodType}.
- * All parameters and the return type will be {@code Object},
- * except the final array parameter if any, which will be {@code Object[]}.
- * @param objectArgCount number of parameters (excluding the final array parameter if any)
- * @param finalArray whether there will be a trailing array parameter, of type {@code Object[]}
- * @return a generally applicable method type, for all calls of the given fixed argument count and a collected array of further arguments
- * @throws IllegalArgumentException if {@code objectArgCount} is negative or greater than 255 (or 254, if {@code finalArray} is true)
- * @see #genericMethodType(int)
- */
- public static
- MethodType genericMethodType(int objectArgCount, boolean finalArray) {
- MethodType mt;
- checkSlotCount(objectArgCount);
- int ivarargs = (!finalArray ? 0 : 1);
- int ootIndex = objectArgCount*2 + ivarargs;
- if (ootIndex < objectOnlyTypes.length) {
- mt = objectOnlyTypes[ootIndex];
- if (mt != null) return mt;
- }
- Class[] ptypes = new Class[objectArgCount + ivarargs];
- Arrays.fill(ptypes, Object.class);
- if (ivarargs != 0) ptypes[objectArgCount] = Object[].class;
- mt = makeImpl(Object.class, ptypes, true);
- if (ootIndex < objectOnlyTypes.length) {
- objectOnlyTypes[ootIndex] = mt; // cache it here also!
- }
- return mt;
- }
-
- /**
- * Finds or creates a method type whose components are all {@code Object}.
- * Convenience method for {@link #methodType(java.lang.Class, java.lang.Class[]) methodType}.
- * All parameters and the return type will be Object.
- * @param objectArgCount number of parameters
- * @return a generally applicable method type, for all calls of the given argument count
- * @throws IllegalArgumentException if {@code objectArgCount} is negative or greater than 255
- * @see #genericMethodType(int, boolean)
- */
- public static
- MethodType genericMethodType(int objectArgCount) {
- return genericMethodType(objectArgCount, false);
- }
-
- /**
- * Finds or creates a method type with a single different parameter type.
- * Convenience method for {@link #methodType(java.lang.Class, java.lang.Class[]) methodType}.
- * @param num the index (zero-based) of the parameter type to change
- * @param nptype a new parameter type to replace the old one with
- * @return the same type, except with the selected parameter changed
- * @throws IndexOutOfBoundsException if {@code num} is not a valid index into {@code parameterArray()}
- * @throws IllegalArgumentException if {@code nptype} is {@code void.class}
- * @throws NullPointerException if {@code nptype} is null
- */
- public MethodType changeParameterType(int num, Class nptype) {
- if (parameterType(num) == nptype) return this;
- checkPtype(nptype);
- Class[] nptypes = ptypes.clone();
- nptypes[num] = nptype;
- return makeImpl(rtype, nptypes, true);
- }
-
- /**
- * Finds or creates a method type with additional parameter types.
- * Convenience method for {@link #methodType(java.lang.Class, java.lang.Class[]) methodType}.
- * @param num the position (zero-based) of the inserted parameter type(s)
- * @param ptypesToInsert zero or more new parameter types to insert into the parameter list
- * @return the same type, except with the selected parameter(s) inserted
- * @throws IndexOutOfBoundsException if {@code num} is negative or greater than {@code parameterCount()}
- * @throws IllegalArgumentException if any element of {@code ptypesToInsert} is {@code void.class}
- * or if the resulting method type would have more than 255 parameter slots
- * @throws NullPointerException if {@code ptypesToInsert} or any of its elements is null
- */
- public MethodType insertParameterTypes(int num, Class... ptypesToInsert) {
- int len = ptypes.length;
- if (num < 0 || num > len)
- throw newIndexOutOfBoundsException(num);
- int ins = checkPtypes(ptypesToInsert);
- checkSlotCount(parameterSlotCount() + ptypesToInsert.length + ins);
- int ilen = ptypesToInsert.length;
- if (ilen == 0) return this;
- Class[] nptypes = Arrays.copyOfRange(ptypes, 0, len+ilen);
- System.arraycopy(nptypes, num, nptypes, num+ilen, len-num);
- System.arraycopy(ptypesToInsert, 0, nptypes, num, ilen);
- return makeImpl(rtype, nptypes, true);
- }
-
- /**
- * Finds or creates a method type with additional parameter types.
- * Convenience method for {@link #methodType(java.lang.Class, java.lang.Class[]) methodType}.
- * @param ptypesToInsert zero or more new parameter types to insert after the end of the parameter list
- * @return the same type, except with the selected parameter(s) appended
- * @throws IllegalArgumentException if any element of {@code ptypesToInsert} is {@code void.class}
- * or if the resulting method type would have more than 255 parameter slots
- * @throws NullPointerException if {@code ptypesToInsert} or any of its elements is null
- */
- public MethodType appendParameterTypes(Class... ptypesToInsert) {
- return insertParameterTypes(parameterCount(), ptypesToInsert);
- }
-
- /**
- * Finds or creates a method type with additional parameter types.
- * Convenience method for {@link #methodType(java.lang.Class, java.lang.Class[]) methodType}.
- * @param num the position (zero-based) of the inserted parameter type(s)
- * @param ptypesToInsert zero or more new parameter types to insert into the parameter list
- * @return the same type, except with the selected parameter(s) inserted
- * @throws IndexOutOfBoundsException if {@code num} is negative or greater than {@code parameterCount()}
- * @throws IllegalArgumentException if any element of {@code ptypesToInsert} is {@code void.class}
- * or if the resulting method type would have more than 255 parameter slots
- * @throws NullPointerException if {@code ptypesToInsert} or any of its elements is null
- */
- public MethodType insertParameterTypes(int num, List> ptypesToInsert) {
- return insertParameterTypes(num, listToArray(ptypesToInsert));
- }
-
- /**
- * Finds or creates a method type with additional parameter types.
- * Convenience method for {@link #methodType(java.lang.Class, java.lang.Class[]) methodType}.
- * @param ptypesToInsert zero or more new parameter types to insert after the end of the parameter list
- * @return the same type, except with the selected parameter(s) appended
- * @throws IllegalArgumentException if any element of {@code ptypesToInsert} is {@code void.class}
- * or if the resulting method type would have more than 255 parameter slots
- * @throws NullPointerException if {@code ptypesToInsert} or any of its elements is null
- */
- public MethodType appendParameterTypes(List> ptypesToInsert) {
- return insertParameterTypes(parameterCount(), ptypesToInsert);
- }
-
- /**
- * Finds or creates a method type with modified parameter types.
- * Convenience method for {@link #methodType(java.lang.Class, java.lang.Class[]) methodType}.
- * @param start the position (zero-based) of the first replaced parameter type(s)
- * @param end the position (zero-based) after the last replaced parameter type(s)
- * @param ptypesToInsert zero or more new parameter types to insert into the parameter list
- * @return the same type, except with the selected parameter(s) replaced
- * @throws IndexOutOfBoundsException if {@code start} is negative or greater than {@code parameterCount()}
- * or if {@code end} is negative or greater than {@code parameterCount()}
- * or if {@code start} is greater than {@code end}
- * @throws IllegalArgumentException if any element of {@code ptypesToInsert} is {@code void.class}
- * or if the resulting method type would have more than 255 parameter slots
- * @throws NullPointerException if {@code ptypesToInsert} or any of its elements is null
- */
- /*non-public*/ MethodType replaceParameterTypes(int start, int end, Class... ptypesToInsert) {
- if (start == end)
- return insertParameterTypes(start, ptypesToInsert);
- int len = ptypes.length;
- if (!(0 <= start && start <= end && end <= len))
- throw newIndexOutOfBoundsException("start="+start+" end="+end);
- int ilen = ptypesToInsert.length;
- if (ilen == 0)
- return dropParameterTypes(start, end);
- return dropParameterTypes(start, end).insertParameterTypes(start, ptypesToInsert);
- }
-
- /**
- * Finds or creates a method type with some parameter types omitted.
- * Convenience method for {@link #methodType(java.lang.Class, java.lang.Class[]) methodType}.
- * @param start the index (zero-based) of the first parameter type to remove
- * @param end the index (greater than {@code start}) of the first parameter type after not to remove
- * @return the same type, except with the selected parameter(s) removed
- * @throws IndexOutOfBoundsException if {@code start} is negative or greater than {@code parameterCount()}
- * or if {@code end} is negative or greater than {@code parameterCount()}
- * or if {@code start} is greater than {@code end}
- */
- public MethodType dropParameterTypes(int start, int end) {
- int len = ptypes.length;
- if (!(0 <= start && start <= end && end <= len))
- throw newIndexOutOfBoundsException("start="+start+" end="+end);
- if (start == end) return this;
- Class[] nptypes;
- if (start == 0) {
- if (end == len) {
- // drop all parameters
- nptypes = NO_PTYPES;
- } else {
- // drop initial parameter(s)
- nptypes = Arrays.copyOfRange(ptypes, end, len);
- }
- } else {
- if (end == len) {
- // drop trailing parameter(s)
- nptypes = Arrays.copyOfRange(ptypes, 0, start);
- } else {
- int tail = len - end;
- nptypes = Arrays.copyOfRange(ptypes, 0, start + tail);
- System.arraycopy(ptypes, end, nptypes, start, tail);
- }
- }
- return makeImpl(rtype, nptypes, true);
- }
-
- /**
- * Finds or creates a method type with a different return type.
- * Convenience method for {@link #methodType(java.lang.Class, java.lang.Class[]) methodType}.
- * @param nrtype a return parameter type to replace the old one with
- * @return the same type, except with the return type change
- * @throws NullPointerException if {@code nrtype} is null
- */
- public MethodType changeReturnType(Class nrtype) {
- if (returnType() == nrtype) return this;
- return makeImpl(nrtype, ptypes, true);
- }
-
- /**
- * Reports if this type contains a primitive argument or return value.
- * The return type {@code void} counts as a primitive.
- * @return true if any of the types are primitives
- */
- public boolean hasPrimitives() {
- return form.hasPrimitives();
- }
-
- /**
- * Reports if this type contains a wrapper argument or return value.
- * Wrappers are types which box primitive values, such as {@link Integer}.
- * The reference type {@code java.lang.Void} counts as a wrapper,
- * if it occurs as a return type.
- * @return true if any of the types are wrappers
- */
- public boolean hasWrappers() {
- return unwrap() != this;
- }
-
- /**
- * Erases all reference types to {@code Object}.
- * Convenience method for {@link #methodType(java.lang.Class, java.lang.Class[]) methodType}.
- * All primitive types (including {@code void}) will remain unchanged.
- * @return a version of the original type with all reference types replaced
- */
- public MethodType erase() {
- return form.erasedType();
- }
-
- /**
- * Erases all reference types to {@code Object}, and all subword types to {@code int}.
- * This is the reduced type polymorphism used by private methods
- * such as {@link MethodHandle#invokeBasic invokeBasic}.
- * @return a version of the original type with all reference and subword types replaced
- */
- /*non-public*/ MethodType basicType() {
- return form.basicType();
- }
-
- /**
- * @return a version of the original type with MethodHandle prepended as the first argument
- */
- /*non-public*/ MethodType invokerType() {
- return insertParameterTypes(0, MethodHandle.class);
- }
-
- /**
- * Converts all types, both reference and primitive, to {@code Object}.
- * Convenience method for {@link #genericMethodType(int) genericMethodType}.
- * The expression {@code type.wrap().erase()} produces the same value
- * as {@code type.generic()}.
- * @return a version of the original type with all types replaced
- */
- public MethodType generic() {
- return genericMethodType(parameterCount());
- }
-
- /**
- * Converts all primitive types to their corresponding wrapper types.
- * Convenience method for {@link #methodType(java.lang.Class, java.lang.Class[]) methodType}.
- * All reference types (including wrapper types) will remain unchanged.
- * A {@code void} return type is changed to the type {@code java.lang.Void}.
- * The expression {@code type.wrap().erase()} produces the same value
- * as {@code type.generic()}.
- * @return a version of the original type with all primitive types replaced
- */
- public MethodType wrap() {
- return hasPrimitives() ? wrapWithPrims(this) : this;
- }
-
- /**
- * Converts all wrapper types to their corresponding primitive types.
- * Convenience method for {@link #methodType(java.lang.Class, java.lang.Class[]) methodType}.
- * All primitive types (including {@code void}) will remain unchanged.
- * A return type of {@code java.lang.Void} is changed to {@code void}.
- * @return a version of the original type with all wrapper types replaced
- */
- public MethodType unwrap() {
- MethodType noprims = !hasPrimitives() ? this : wrapWithPrims(this);
- return unwrapWithNoPrims(noprims);
- }
-
- private static MethodType wrapWithPrims(MethodType pt) {
- assert(pt.hasPrimitives());
- MethodType wt = pt.wrapAlt;
- if (wt == null) {
- // fill in lazily
- wt = MethodTypeForm.canonicalize(pt, MethodTypeForm.WRAP, MethodTypeForm.WRAP);
- assert(wt != null);
- pt.wrapAlt = wt;
- }
- return wt;
- }
-
- private static MethodType unwrapWithNoPrims(MethodType wt) {
- assert(!wt.hasPrimitives());
- MethodType uwt = wt.wrapAlt;
- if (uwt == null) {
- // fill in lazily
- uwt = MethodTypeForm.canonicalize(wt, MethodTypeForm.UNWRAP, MethodTypeForm.UNWRAP);
- if (uwt == null)
- uwt = wt; // type has no wrappers or prims at all
- wt.wrapAlt = uwt;
- }
- return uwt;
- }
-
- /**
- * Returns the parameter type at the specified index, within this method type.
- * @param num the index (zero-based) of the desired parameter type
- * @return the selected parameter type
- * @throws IndexOutOfBoundsException if {@code num} is not a valid index into {@code parameterArray()}
- */
- public Class parameterType(int num) {
- return ptypes[num];
- }
- /**
- * Returns the number of parameter types in this method type.
- * @return the number of parameter types
- */
- public int parameterCount() {
- return ptypes.length;
- }
- /**
- * Returns the return type of this method type.
- * @return the return type
- */
- public Class returnType() {
- return rtype;
- }
-
- /**
- * Presents the parameter types as a list (a convenience method).
- * The list will be immutable.
- * @return the parameter types (as an immutable list)
- */
- public List> parameterList() {
- return Collections.unmodifiableList(Arrays.asList(ptypes));
- }
-
- /*non-public*/ Class lastParameterType() {
- int len = ptypes.length;
- return len == 0 ? void.class : ptypes[len-1];
- }
-
- /**
- * Presents the parameter types as an array (a convenience method).
- * Changes to the array will not result in changes to the type.
- * @return the parameter types (as a fresh copy if necessary)
- */
- public Class[] parameterArray() {
- return ptypes.clone();
- }
-
- /**
- * Compares the specified object with this type for equality.
- * That is, it returns true if and only if the specified object
- * is also a method type with exactly the same parameters and return type.
- * @param x object to compare
- * @see Object#equals(Object)
- */
- @Override
- public boolean equals(Object x) {
- return this == x || x instanceof MethodType && equals((MethodType)x);
- }
-
- private boolean equals(MethodType that) {
- return this.rtype == that.rtype
- && Arrays.equals(this.ptypes, that.ptypes);
- }
-
- /**
- * Returns the hash code value for this method type.
- * It is defined to be the same as the hashcode of a List
- * whose elements are the return type followed by the
- * parameter types.
- * @return the hash code value for this method type
- * @see Object#hashCode()
- * @see #equals(Object)
- * @see List#hashCode()
- */
- @Override
- public int hashCode() {
- int hashCode = 31 + rtype.hashCode();
- for (Class ptype : ptypes)
- hashCode = 31*hashCode + ptype.hashCode();
- return hashCode;
- }
-
- /**
- * Returns a string representation of the method type,
- * of the form {@code "(PT0,PT1...)RT"}.
- * The string representation of a method type is a
- * parenthesis enclosed, comma separated list of type names,
- * followed immediately by the return type.
- *
- * Each type is represented by its
- * {@link java.lang.Class#getSimpleName simple name}.
- */
- @Override
- public String toString() {
- StringBuilder sb = new StringBuilder();
- sb.append("(");
- for (int i = 0; i < ptypes.length; i++) {
- if (i > 0) sb.append(",");
- sb.append(ptypes[i].getSimpleName());
- }
- sb.append(")");
- sb.append(rtype.getSimpleName());
- return sb.toString();
- }
-
-
- /*non-public*/
- boolean isViewableAs(MethodType newType) {
- if (!VerifyType.isNullConversion(returnType(), newType.returnType()))
- return false;
- int argc = parameterCount();
- if (argc != newType.parameterCount())
- return false;
- for (int i = 0; i < argc; i++) {
- if (!VerifyType.isNullConversion(newType.parameterType(i), parameterType(i)))
- return false;
- }
- return true;
- }
- /*non-public*/
- boolean isCastableTo(MethodType newType) {
- int argc = parameterCount();
- if (argc != newType.parameterCount())
- return false;
- return true;
- }
- /*non-public*/
- boolean isConvertibleTo(MethodType newType) {
- if (!canConvert(returnType(), newType.returnType()))
- return false;
- int argc = parameterCount();
- if (argc != newType.parameterCount())
- return false;
- for (int i = 0; i < argc; i++) {
- if (!canConvert(newType.parameterType(i), parameterType(i)))
- return false;
- }
- return true;
- }
- /*non-public*/
- static boolean canConvert(Class src, Class dst) {
- // short-circuit a few cases:
- if (src == dst || dst == Object.class) return true;
- // the remainder of this logic is documented in MethodHandle.asType
- if (src.isPrimitive()) {
- // can force void to an explicit null, a la reflect.Method.invoke
- // can also force void to a primitive zero, by analogy
- if (src == void.class) return true; //or !dst.isPrimitive()?
- Wrapper sw = Wrapper.forPrimitiveType(src);
- if (dst.isPrimitive()) {
- // P->P must widen
- return Wrapper.forPrimitiveType(dst).isConvertibleFrom(sw);
- } else {
- // P->R must box and widen
- return dst.isAssignableFrom(sw.wrapperType());
- }
- } else if (dst.isPrimitive()) {
- // any value can be dropped
- if (dst == void.class) return true;
- Wrapper dw = Wrapper.forPrimitiveType(dst);
- // R->P must be able to unbox (from a dynamically chosen type) and widen
- // For example:
- // Byte/Number/Comparable/Object -> dw:Byte -> byte.
- // Character/Comparable/Object -> dw:Character -> char
- // Boolean/Comparable/Object -> dw:Boolean -> boolean
- // This means that dw must be cast-compatible with src.
- if (src.isAssignableFrom(dw.wrapperType())) {
- return true;
- }
- // The above does not work if the source reference is strongly typed
- // to a wrapper whose primitive must be widened. For example:
- // Byte -> unbox:byte -> short/int/long/float/double
- // Character -> unbox:char -> int/long/float/double
- if (Wrapper.isWrapperType(src) &&
- dw.isConvertibleFrom(Wrapper.forWrapperType(src))) {
- // can unbox from src and then widen to dst
- return true;
- }
- // We have already covered cases which arise due to runtime unboxing
- // of a reference type which covers several wrapper types:
- // Object -> cast:Integer -> unbox:int -> long/float/double
- // Serializable -> cast:Byte -> unbox:byte -> byte/short/int/long/float/double
- // An marginal case is Number -> dw:Character -> char, which would be OK if there were a
- // subclass of Number which wraps a value that can convert to char.
- // Since there is none, we don't need an extra check here to cover char or boolean.
- return false;
- } else {
- // R->R always works, since null is always valid dynamically
- return true;
- }
- }
-
- /// Queries which have to do with the bytecode architecture
-
- /** Reports the number of JVM stack slots required to invoke a method
- * of this type. Note that (for historical reasons) the JVM requires
- * a second stack slot to pass long and double arguments.
- * So this method returns {@link #parameterCount() parameterCount} plus the
- * number of long and double parameters (if any).
- *
- * This method is included for the benefit of applications that must
- * generate bytecodes that process method handles and invokedynamic.
- * @return the number of JVM stack slots for this type's parameters
- */
- /*non-public*/ int parameterSlotCount() {
- return form.parameterSlotCount();
- }
-
- /*non-public*/ Invokers invokers() {
- Invokers inv = invokers;
- if (inv != null) return inv;
- invokers = inv = new Invokers(this);
- return inv;
- }
-
- /** Reports the number of JVM stack slots which carry all parameters including and after
- * the given position, which must be in the range of 0 to
- * {@code parameterCount} inclusive. Successive parameters are
- * more shallowly stacked, and parameters are indexed in the bytecodes
- * according to their trailing edge. Thus, to obtain the depth
- * in the outgoing call stack of parameter {@code N}, obtain
- * the {@code parameterSlotDepth} of its trailing edge
- * at position {@code N+1}.
- *
- * Parameters of type {@code long} and {@code double} occupy
- * two stack slots (for historical reasons) and all others occupy one.
- * Therefore, the number returned is the number of arguments
- * including and after the given parameter,
- * plus the number of long or double arguments
- * at or after after the argument for the given parameter.
- *
- * This method is included for the benefit of applications that must
- * generate bytecodes that process method handles and invokedynamic.
- * @param num an index (zero-based, inclusive) within the parameter types
- * @return the index of the (shallowest) JVM stack slot transmitting the
- * given parameter
- * @throws IllegalArgumentException if {@code num} is negative or greater than {@code parameterCount()}
- */
- /*non-public*/ int parameterSlotDepth(int num) {
- if (num < 0 || num > ptypes.length)
- parameterType(num); // force a range check
- return form.parameterToArgSlot(num-1);
- }
-
- /** Reports the number of JVM stack slots required to receive a return value
- * from a method of this type.
- * If the {@link #returnType() return type} is void, it will be zero,
- * else if the return type is long or double, it will be two, else one.
- *
- * This method is included for the benefit of applications that must
- * generate bytecodes that process method handles and invokedynamic.
- * @return the number of JVM stack slots (0, 1, or 2) for this type's return value
- * Will be removed for PFD.
- */
- /*non-public*/ int returnSlotCount() {
- return form.returnSlotCount();
- }
-
- /**
- * Finds or creates an instance of a method type, given the spelling of its bytecode descriptor.
- * Convenience method for {@link #methodType(java.lang.Class, java.lang.Class[]) methodType}.
- * Any class or interface name embedded in the descriptor string
- * will be resolved by calling {@link ClassLoader#loadClass(java.lang.String)}
- * on the given loader (or if it is null, on the system class loader).
- *
- * Note that it is possible to encounter method types which cannot be
- * constructed by this method, because their component types are
- * not all reachable from a common class loader.
- *
- * This method is included for the benefit of applications that must
- * generate bytecodes that process method handles and {@code invokedynamic}.
- * @param descriptor a bytecode-level type descriptor string "(T...)T"
- * @param loader the class loader in which to look up the types
- * @return a method type matching the bytecode-level type descriptor
- * @throws NullPointerException if the string is null
- * @throws IllegalArgumentException if the string is not well-formed
- * @throws TypeNotPresentException if a named type cannot be found
- */
- public static MethodType fromMethodDescriptorString(String descriptor, ClassLoader loader)
- throws IllegalArgumentException, TypeNotPresentException
- {
- if (!descriptor.startsWith("(") || // also generates NPE if needed
- descriptor.indexOf(')') < 0 ||
- descriptor.indexOf('.') >= 0)
- throw new IllegalArgumentException("not a method descriptor: "+descriptor);
- List> types = BytecodeDescriptor.parseMethod(descriptor, loader);
- Class rtype = types.remove(types.size() - 1);
- checkSlotCount(types.size());
- Class[] ptypes = listToArray(types);
- return makeImpl(rtype, ptypes, true);
- }
-
- /**
- * Produces a bytecode descriptor representation of the method type.
- *
- * Note that this is not a strict inverse of {@link #fromMethodDescriptorString fromMethodDescriptorString}.
- * Two distinct classes which share a common name but have different class loaders
- * will appear identical when viewed within descriptor strings.
- *
- * This method is included for the benefit of applications that must
- * generate bytecodes that process method handles and {@code invokedynamic}.
- * {@link #fromMethodDescriptorString(java.lang.String, java.lang.ClassLoader) fromMethodDescriptorString},
- * because the latter requires a suitable class loader argument.
- * @return the bytecode type descriptor representation
- */
- public String toMethodDescriptorString() {
- String desc = methodDescriptor;
- if (desc == null) {
- desc = BytecodeDescriptor.unparse(this);
- methodDescriptor = desc;
- }
- return desc;
- }
-
- /*non-public*/ static String toFieldDescriptorString(Class cls) {
- return BytecodeDescriptor.unparse(cls);
- }
-
- /// Serialization.
-
- /**
- * There are no serializable fields for {@code MethodType}.
- */
- private static final java.io.ObjectStreamField[] serialPersistentFields = { };
-
-// /**
-// * Save the {@code MethodType} instance to a stream.
-// *
-// * @serialData
-// * For portability, the serialized format does not refer to named fields.
-// * Instead, the return type and parameter type arrays are written directly
-// * from the {@code writeObject} method, using two calls to {@code s.writeObject}
-// * as follows:
-// *
{@code
-//s.writeObject(this.returnType());
-//s.writeObject(this.parameterArray());
-// * }
-// *
-// * The deserialized field values are checked as if they were
-// * provided to the factory method {@link #methodType(Class,Class[]) methodType}.
-// * For example, null values, or {@code void} parameter types,
-// * will lead to exceptions during deserialization.
-// * @param s the stream to write the object to
-// * @throws java.io.IOException if there is a problem writing the object
-// */
-// private void writeObject(java.io.ObjectOutputStream s) throws java.io.IOException {
-// s.defaultWriteObject(); // requires serialPersistentFields to be an empty array
-// s.writeObject(returnType());
-// s.writeObject(parameterArray());
-// }
-//
-// /**
-// * Reconstitute the {@code MethodType} instance from a stream (that is,
-// * deserialize it).
-// * This instance is a scratch object with bogus final fields.
-// * It provides the parameters to the factory method called by
-// * {@link #readResolve readResolve}.
-// * After that call it is discarded.
-// * @param s the stream to read the object from
-// * @throws java.io.IOException if there is a problem reading the object
-// * @throws ClassNotFoundException if one of the component classes cannot be resolved
-// * @see #MethodType()
-// * @see #readResolve
-// * @see #writeObject
-// */
-// private void readObject(java.io.ObjectInputStream s) throws java.io.IOException, ClassNotFoundException {
-// s.defaultReadObject(); // requires serialPersistentFields to be an empty array
-//
-// Class returnType = (Class) s.readObject();
-// Class[] parameterArray = (Class[]) s.readObject();
-//
-// // Probably this object will never escape, but let's check
-// // the field values now, just to be sure.
-// checkRtype(returnType);
-// checkPtypes(parameterArray);
-//
-// parameterArray = parameterArray.clone(); // make sure it is unshared
-// MethodType_init(returnType, parameterArray);
-// }
-
- /**
- * For serialization only.
- * Sets the final fields to null, pending {@code Unsafe.putObject}.
- */
- private MethodType() {
- this.rtype = null;
- this.ptypes = null;
- }
-// private void MethodType_init(Class rtype, Class[] ptypes) {
-// // In order to communicate these values to readResolve, we must
-// // store them into the implementation-specific final fields.
-// checkRtype(rtype);
-// checkPtypes(ptypes);
-// UNSAFE.putObject(this, rtypeOffset, rtype);
-// UNSAFE.putObject(this, ptypesOffset, ptypes);
-// }
-
- // Support for resetting final fields while deserializing
-// private static final long rtypeOffset, ptypesOffset;
-// static {
-// try {
-// rtypeOffset = UNSAFE.objectFieldOffset
-// (MethodType.class.getDeclaredField("rtype"));
-// ptypesOffset = UNSAFE.objectFieldOffset
-// (MethodType.class.getDeclaredField("ptypes"));
-// } catch (Exception ex) {
-// throw new Error(ex);
-// }
-// }
-
- /**
- * Resolves and initializes a {@code MethodType} object
- * after serialization.
- * @return the fully initialized {@code MethodType} object
- */
- private Object readResolve() {
- // Do not use a trusted path for deserialization:
- //return makeImpl(rtype, ptypes, true);
- // Verify all operands, and make sure ptypes is unshared:
- return methodType(rtype, ptypes);
- }
-
- /**
- * Simple implementation of weak concurrent intern set.
- *
- * @param interned type
- */
- private static class ConcurrentWeakInternSet {
-
- private final ConcurrentMap, WeakEntry> map;
- private final ReferenceQueue stale;
-
- public ConcurrentWeakInternSet() {
- this.map = new ConcurrentHashMap<>();
- this.stale = new ReferenceQueue<>();
- }
-
- /**
- * Get the existing interned element.
- * This method returns null if no element is interned.
- *
- * @param elem element to look up
- * @return the interned element
- */
- public T get(T elem) {
- if (elem == null) throw new NullPointerException();
- expungeStaleElements();
-
- WeakEntry value = map.get(new WeakEntry<>(elem));
- if (value != null) {
- T res = value.get();
- if (res != null) {
- return res;
- }
- }
- return null;
- }
-
- /**
- * Interns the element.
- * Always returns non-null element, matching the one in the intern set.
- * Under the race against another add(), it can return different
- * element, if another thread beats us to interning it.
- *
- * @param elem element to add
- * @return element that was actually added
- */
- public T add(T elem) {
- if (elem == null) throw new NullPointerException();
-
- // Playing double race here, and so spinloop is required.
- // First race is with two concurrent updaters.
- // Second race is with GC purging weak ref under our feet.
- // Hopefully, we almost always end up with a single pass.
- T interned;
- WeakEntry e = new WeakEntry<>(elem, stale);
- do {
- expungeStaleElements();
- WeakEntry exist = map.putIfAbsent(e, e);
- interned = (exist == null) ? elem : exist.get();
- } while (interned == null);
- return interned;
- }
-
- private void expungeStaleElements() {
- Reference reference;
- while ((reference = stale.poll()) != null) {
- map.remove(reference);
- }
- }
-
- private static class WeakEntry extends WeakReference {
-
- public final int hashcode;
-
- public WeakEntry(T key, ReferenceQueue queue) {
- super(key, queue);
- hashcode = key.hashCode();
- }
-
- public WeakEntry(T key) {
- super(key);
- hashcode = key.hashCode();
- }
-
- @Override
- public boolean equals(Object obj) {
- if (obj instanceof WeakEntry) {
- Object that = ((WeakEntry) obj).get();
- Object mine = get();
- return (that == null || mine == null) ? (this == obj) : mine.equals(that);
- }
- return false;
- }
-
- @Override
- public int hashCode() {
- return hashcode;
- }
-
- }
- }
-
-}