com.oracle.truffle.api.interop.ArityException Maven / Gradle / Ivy
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package com.oracle.truffle.api.interop;
import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
/**
* An exception thrown if a executable or instantiable object was provided with the wrong number of
* arguments.
*
* @since 0.11
*/
public final class ArityException extends InteropException {
private static final long serialVersionUID = 1857745390734085182L;
private final int expectedMinArity;
private final int expectedMaxArity;
private final int actualArity;
private ArityException(int expectedMinArity, int expectedMaxArity, int actualArity, Throwable cause) {
super(null, cause);
this.expectedMinArity = expectedMinArity;
this.expectedMaxArity = expectedMaxArity;
this.actualArity = actualArity;
}
/**
* {@inheritDoc}
*
* @since 19.0
*/
@Override
@TruffleBoundary
public String getMessage() {
String given;
if (actualArity < 0) {
given = "unknown";
} else {
given = String.valueOf(actualArity);
}
String expected;
if (expectedMinArity == expectedMaxArity) {
expected = String.valueOf(expectedMinArity);
} else {
if (expectedMaxArity < 0) {
expected = expectedMinArity + "+";
} else {
expected = expectedMinArity + "-" + expectedMaxArity;
}
}
return String.format("Arity error - expected: %s actual: %s", expected, given);
}
/**
* Returns the minimum number of arguments that are expected. The returned minimum arity might
* be less conservative than the actual specification of the executable or instantiable invoked.
*
* @since 21.0
*/
public int getExpectedMinArity() {
return expectedMinArity;
}
/**
* Returns the maximum number of arguments that are expected. Returns a negative number if
* infinite arguments can be provided.
*
* @since 21.0
*/
public int getExpectedMaxArity() {
return expectedMaxArity;
}
/**
* Returns the actual number of arguments provided by the foreign access. If a negative value is
* returned then the actual arity is unknown.
*
* @return the number of provided arguments
* @since 0.11
*/
public int getActualArity() {
return actualArity;
}
/**
* Creates an {@link ArityException} to indicate that the wrong number of arguments were
* provided. Throws an {@link IllegalArgumentException} if the arguments are invalid and
* assertions (-ea) are enabled.
*
* This method is designed to be used in {@link CompilerDirectives#inCompiledCode() compiled}
* code paths.
*
* @param expectedMinArity (inclusive) the minimum number of arguments expected by the
* executable. Must be greater or equal to zero.
* @param expectedMaxArity (inclusive) the maximum number of arguments expected by the
* executable. If the maximum is negative then an infinite number of arguments is
* expected. If the number is positive then the maximum must be greater or equal to
* {@code expectedMinArity}.
* @param actualArity the number of provided by the executable. The actual arity must not be
* within range of the expected min and max arity.
* @since 21.2
*/
public static ArityException create(int expectedMinArity, int expectedMaxArity, int actualArity) {
assert validateArity(expectedMinArity, expectedMaxArity, actualArity);
return new ArityException(expectedMinArity, expectedMaxArity, actualArity, null);
}
/**
* Creates an {@link ArityException} to indicate that the wrong number of arguments were
* provided. Throws an {@link IllegalArgumentException} if the arguments are invalid and
* assertions (-ea) are enabled.
*
* In addition a cause may be provided. The cause should only be set if the guest language code
* caused this problem. An example for this is a language specific proxy mechanism that invokes
* guest language code to describe an object. If the guest language code fails to execute and
* this interop exception is a valid interpretation of the error, then the error should be
* provided as cause. The cause can then be used by the source language as new exception cause
* if the {@link InteropException} is translated to a source language error. If the
* {@link InteropException} is discarded, then the cause will most likely get discarded by the
* source language as well. Note that the cause must be of type
* {@link com.oracle.truffle.api.exception.AbstractTruffleException} otherwise an
* {@link IllegalArgumentException} is thrown.
*
* This method is designed to be used in {@link CompilerDirectives#inCompiledCode() compiled}
* code paths.
*
* @param expectedMinArity (inclusive) the minimum number of arguments expected by the
* executable. Must be greater or equal to zero.
* @param expectedMaxArity (inclusive) the maximum number of arguments expected by the
* executable. If the maximum is negative then an infinite number of arguments is
* expected. If the number is positive then the maximum must be greater or equal to
* {@code expectedMinArity}.
* @param actualArity the number of provided by the executable. The actual arity must not be
* within range of the expected min and max arity.
* @param cause the guest language exception that caused the error.
* @since 21.2
*/
public static ArityException create(int expectedMinArity, int expectedMaxArity, int actualArity, Throwable cause) {
assert validateArity(expectedMinArity, expectedMaxArity, actualArity);
return new ArityException(expectedMinArity, expectedMaxArity, actualArity, cause);
}
private static boolean validateArity(int expectedMinArity, int expectedMaxArity, int actualArity) {
if (expectedMinArity < 0) {
CompilerDirectives.transferToInterpreterAndInvalidate();
throw new IllegalArgumentException("Expected min arity must be greater or equal to zero.");
} else if (expectedMaxArity >= 0) {
if (expectedMaxArity < expectedMinArity) {
CompilerDirectives.transferToInterpreterAndInvalidate();
throw new IllegalArgumentException("Expected max arity must be greater or equal to min arity.");
}
if (actualArity >= 0 && actualArity >= expectedMinArity && actualArity <= expectedMaxArity) {
CompilerDirectives.transferToInterpreterAndInvalidate();
throw new IllegalArgumentException("Actual arity is in valid arity range.");
}
} else {
if (actualArity >= 0 && actualArity >= expectedMinArity) {
CompilerDirectives.transferToInterpreterAndInvalidate();
throw new IllegalArgumentException("Actual arity is in valid arity range.");
}
}
return true;
}
}