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/*
* Copyright (C) 2011 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.google.dexmaker;
import com.android.dx.rop.code.RegisterSpec;
/**
* A temporary variable that holds a single value of a known type.
*/
public final class Local<T> {
private final Code code;
final TypeId<T> type;
private int reg = -1;
private RegisterSpec spec;
private Local(Code code, TypeId<T> type) {
this.code = code;
this.type = type;
}
static <T> Local<T> get(Code code, TypeId<T> type) {
return new Local<T>(code, type);
}
/**
* Assigns registers to this local.
*
* @return the number of registers required.
*/
int initialize(int nextAvailableRegister) {
this.reg = nextAvailableRegister;
this.spec = RegisterSpec.make(nextAvailableRegister, type.ropType);
return size();
}
/**
* Returns the number of registered required to hold this local.
*/
int size() {
return type.ropType.getCategory();
}
RegisterSpec spec() {
if (spec == null) {
code.initializeLocals();
if (spec == null) {
throw new AssertionError();
}
}
return spec;
}
public TypeId getType() {
return type;
}
@Override public String toString() {
return "v" + reg + "(" + type + ")";
}
}
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