content: /*
   * Copyright (C) 2020 ActiveJ LLC.
   *
   * 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 io.activej.codegen.expression.impl;
  
  import io.activej.codegen.Context;
  import io.activej.codegen.expression.Expression;
  import io.activej.codegen.operation.CompareOperation;
  import io.activej.common.annotation.ExposedInternals;
  import org.objectweb.asm.Label;
  import org.objectweb.asm.Type;
  import org.objectweb.asm.commons.GeneratorAdapter;
  
  import static io.activej.codegen.util.TypeChecks.checkType;
  import static org.objectweb.asm.Type.BOOLEAN;
  import static org.objectweb.asm.Type.INT;
  
  @ExposedInternals
  public final class IfZCmp implements Expression {
  	public final Expression value;
  	public final CompareOperation operation;
  	public final Expression expressionTrue;
  	public final Expression expressionFalse;
  
  	public IfZCmp(Expression value, CompareOperation operation, Expression expressionTrue, Expression expressionFalse) {
  		this.value = value;
  		this.operation = operation;
  		this.expressionTrue = expressionTrue;
  		this.expressionFalse = expressionFalse;
  	}
  
  	@Override
  	public Type load(Context ctx) {
  		GeneratorAdapter g = ctx.getGeneratorAdapter();
  
  		Label labelTrue = new Label();
  		Label labelExit = new Label();
  
  		Type valueType = value.load(ctx);
  		checkType(valueType, type -> type != null && (type.getSort() >= BOOLEAN && type.getSort() <= INT));
  
  		g.ifZCmp(operation.opCode, labelTrue);
  
  		Type typeFalse = expressionFalse.load(ctx);
  		g.goTo(labelExit);
  
  		g.mark(labelTrue);
  		Type typeTrue = expressionTrue.load(ctx);
  
  		g.mark(labelExit);
  
  		return ctx.unifyTypes(typeFalse, typeTrue);
  	}
  }
  