42 lines
1.4 KiB
Java
42 lines
1.4 KiB
Java
package Models.Expressions;
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import Exceptions.BaseException;
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import Models.Program.IDictionary;
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import Models.Program.IHeap;
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import Models.Types.IType;
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import Models.Types.ReferenceType;
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import Models.Values.IValue;
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import Models.Values.ReferenceValue;
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public class ReadHeap implements IExpression {
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private IExpression expression;
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public ReadHeap(IExpression expression) {
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this.expression = expression;
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}
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public IValue evaluate(IDictionary<String, IValue> table, IHeap heap) throws BaseException {
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IValue value = this.expression.evaluate(table, heap);
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if(!(value instanceof ReferenceValue)) {
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throw new BaseException("Expression is not a reference value");
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}
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int address = ((ReferenceValue)value).getAddress();
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if(!heap.contains(address)) {
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throw new BaseException("Address " + address + " is not in the heap");
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}
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return heap.get(address);
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}
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public IExpression copy() {
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return new ReadHeap(this.expression.copy());
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}
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public IType typeCheck(IDictionary<String, IType> typeTable) throws BaseException {
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IType type = this.expression.typeCheck(typeTable);
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if(!(type instanceof ReferenceType)) {
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throw new BaseException("Expression is not a reference value");
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}
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return ((ReferenceType)type).getInnerType();
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}
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}
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