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8157246: MHs.arrayLength, arrayElementGetter/Setter, arrayConstructor need to specify invocation-time behavior

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Reviewed-by: psandoz, rriggs
This commit is contained in:
Mandy Chung 2017-11-17 08:12:02 -06:00
parent 6a826075c2
commit 52693f1ca5
8 changed files with 248 additions and 11 deletions
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48
src/java.base/share/classes/java/lang/invoke/MethodHandles.java
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@ -2514,14 +2514,20 @@ return mh1;
}
/**
* Produces a method handle constructing arrays of a desired type.
* Produces a method handle constructing arrays of a desired type,
* as if by the {@code anewarray} bytecode.
* The return type of the method handle will be the array type.
* The type of its sole argument will be {@code int}, which specifies the size of the array.
*
* <p> If the returned method handle is invoked with a negative
* array size, a {@code NegativeArraySizeException} will be thrown.
*
* @param arrayClass an array type
* @return a method handle which can create arrays of the given type
* @throws NullPointerException if the argument is {@code null}
* @throws IllegalArgumentException if {@code arrayClass} is not an array type
* @see java.lang.reflect.Array#newInstance(Class, int)
* @jvms 6.5 {@code anewarray} Instruction
* @since 9
*/
public static
@ -2535,13 +2541,19 @@ return mh1;
}
/**
* Produces a method handle returning the length of an array.
* Produces a method handle returning the length of an array,
* as if by the {@code arraylength} bytecode.
* The type of the method handle will have {@code int} as return type,
* and its sole argument will be the array type.
*
* <p> If the returned method handle is invoked with a {@code null}
* array reference, a {@code NullPointerException} will be thrown.
*
* @param arrayClass an array type
* @return a method handle which can retrieve the length of an array of the given array type
* @throws NullPointerException if the argument is {@code null}
* @throws IllegalArgumentException if arrayClass is not an array type
* @jvms 6.5 {@code arraylength} Instruction
* @since 9
*/
public static
@ -2550,14 +2562,24 @@ return mh1;
}
/**
* Produces a method handle giving read access to elements of an array.
* Produces a method handle giving read access to elements of an array,
* as if by the {@code aaload} bytecode.
* The type of the method handle will have a return type of the array's
* element type. Its first argument will be the array type,
* and the second will be {@code int}.
*
* <p> When the returned method handle is invoked,
* the array reference and array index are checked.
* A {@code NullPointerException} will be thrown if the array reference
* is {@code null} and an {@code ArrayIndexOutOfBoundsException} will be
* thrown if the index is negative or if it is greater than or equal to
* the length of the array.
*
* @param arrayClass an array type
* @return a method handle which can load values from the given array type
* @throws NullPointerException if the argument is null
* @throws IllegalArgumentException if arrayClass is not an array type
* @jvms 6.5 {@code aaload} Instruction
*/
public static
MethodHandle arrayElementGetter(Class<?> arrayClass) throws IllegalArgumentException {
@ -2565,14 +2587,24 @@ return mh1;
}
/**
* Produces a method handle giving write access to elements of an array.
* Produces a method handle giving write access to elements of an array,
* as if by the {@code astore} bytecode.
* The type of the method handle will have a void return type.
* Its last argument will be the array's element type.
* The first and second arguments will be the array type and int.
*
* <p> When the returned method handle is invoked,
* the array reference and array index are checked.
* A {@code NullPointerException} will be thrown if the array reference
* is {@code null} and an {@code ArrayIndexOutOfBoundsException} will be
* thrown if the index is negative or if it is greater than or equal to
* the length of the array.
*
* @param arrayClass the class of an array
* @return a method handle which can store values into the array type
* @throws NullPointerException if the argument is null
* @throws IllegalArgumentException if arrayClass is not an array type
* @jvms 6.5 {@code aastore} Instruction
*/
public static
MethodHandle arrayElementSetter(Class<?> arrayClass) throws IllegalArgumentException {
@ -2603,6 +2635,14 @@ return mh1;
* and atomic update access modes compare values using their bitwise
* representation (see {@link Float#floatToRawIntBits} and
* {@link Double#doubleToRawLongBits}, respectively).
*
* <p> When the returned {@code VarHandle} is invoked,
* the array reference and array index are checked.
* A {@code NullPointerException} will be thrown if the array reference
* is {@code null} and an {@code ArrayIndexOutOfBoundsException} will be
* thrown if the index is negative or if it is greater than or equal to
* the length of the array.
*
* @apiNote
* Bitwise comparison of {@code float} values or {@code double} values,
* as performed by the numeric and atomic update access modes, differ