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/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.dx.dex.code;
import com.android.dx.rop.code.RegisterSpec;
import com.android.dx.rop.code.RegisterSpecList;
import com.android.dx.rop.code.SourcePosition;
/**
* Pseudo-instruction which is used to explicitly end the mapping of a
* register to a named local variable. That is, an instance of this
* class in an instruction stream indicates that starting with the
* subsequent instruction, the indicated variable is no longer valid.
*/
public final class LocalEnd extends ZeroSizeInsn {
/**
* {@code non-null;} register spec representing the local variable ended
* by this instance. <b>Note:</b> Technically, only the register
* number needs to be recorded here as the rest of the information
* is implicit in the ambient local variable state, but other code
* will check the other info for consistency.
*/
private final RegisterSpec local;
/**
* Constructs an instance. The output address of this instance is initially
* unknown ({@code -1}).
*
* @param position {@code non-null;} source position
* @param local {@code non-null;} register spec representing the local
* variable introduced by this instance
*/
public LocalEnd(SourcePosition position, RegisterSpec local) {
super(position);
if (local == null) {
throw new NullPointerException("local == null");
}
this.local = local;
}
/** {@inheritDoc} */
@Override
public DalvInsn withRegisterOffset(int delta) {
return new LocalEnd(getPosition(), local.withOffset(delta));
}
/** {@inheritDoc} */
@Override
public DalvInsn withRegisters(RegisterSpecList registers) {
return new LocalEnd(getPosition(), local);
}
/**
* Gets the register spec representing the local variable ended
* by this instance.
*
* @return {@code non-null;} the register spec
*/
public RegisterSpec getLocal() {
return local;
}
/** {@inheritDoc} */
@Override
protected String argString() {
return local.toString();
}
/** {@inheritDoc} */
@Override
protected String listingString0(boolean noteIndices) {
return "local-end " + LocalStart.localString(local);
}
}
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