50 lines
1.3 KiB
Java
50 lines
1.3 KiB
Java
package abstractSyntaxTree.Statement;
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import TypeCheck.TypeCheckResult;
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import TypeCheck.AbstractType;
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import abstractSyntaxTree.Expression.IExpression;
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import org.objectweb.asm.*;
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public class IfStatement extends AbstractType implements IStatement{
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IExpression condition;
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//Do we need a block statement here?
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IStatement ifStatement;
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public IfStatement(IExpression condition, IStatement ifStatement) {
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this.condition = condition;
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this.ifStatement = ifStatement;
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}
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@Override
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public TypeCheckResult typeCheck() throws Exception {
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TypeCheckResult result = new TypeCheckResult();
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TypeCheckResult conditionType = condition.typeCheck();
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if (!conditionType.equals("boolean")) {
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throw new IllegalArgumentException("should be boolean");
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}
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TypeCheckResult ifStatementType = ifStatement.typeCheck();
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result.type = ifStatementType.type;
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return result;
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}
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@Override
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public void codeGen(MethodVisitor mv) throws Exception {
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Label conditionFalse = new Label();
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condition.CodeGen(mv);
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mv.visitJumpInsn(Opcodes.IFEQ, conditionFalse); //Checks if the condition is false (0)
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ifStatement.codeGen(mv);
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mv.visitLabel(conditionFalse); // If the condition is false, the Statements in the ifBlock will not be executed
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}
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}
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