59 lines
1.9 KiB
Java
59 lines
1.9 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 IfElseStatement extends AbstractType implements IStatement{
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IExpression condition;
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IStatement ifStatement;
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IStatement elseStatement;
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public IfElseStatement(IExpression condition, IStatement ifStatement, IStatement elseStatement) {
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this.condition = condition;
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this.ifStatement = ifStatement;
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this.elseStatement = elseStatement;
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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("bool")) {
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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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TypeCheckResult elseStatementType = elseStatement.typeCheck();
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if (!ifStatementType.equals(elseStatementType)) {
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throw new IllegalArgumentException("if and else have different types");
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}
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result.type = elseStatementType.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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Label statementEnd = 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); //If the condition is true, execute the ifBlock
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mv.visitJumpInsn(Opcodes.GOTO, statementEnd); //Jump to the end of the if-else statement
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mv.visitLabel(conditionFalse);
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elseStatement.CodeGen(mv); //If the condition is false, execute the elseBlock
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mv.visitLabel(statementEnd); //End of the if-else statement
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}
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}
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