org.eclipse.jdt.core/compiler/org/eclipse/jdt/internal/compiler/ast/ThrowStatement.java

package org.eclipse.jdt.internal.compiler.ast;

/*
 * (c) Copyright IBM Corp. 2000, 2001.
 * All Rights Reserved.
 */
import org.eclipse.jdt.internal.compiler.IAbstractSyntaxTreeVisitor;
import org.eclipse.jdt.internal.compiler.impl.*;
import org.eclipse.jdt.internal.compiler.codegen.*;
import org.eclipse.jdt.internal.compiler.flow.*;
import org.eclipse.jdt.internal.compiler.lookup.*;

public class ThrowStatement extends Statement {
	public Expression exception;
	public TypeBinding exceptionType;

	public ThrowStatement(Expression exception, int startPosition) {
		this.exception = exception;
		this.sourceStart = startPosition;
		this.sourceEnd = exception.sourceEnd;
	}

	public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) {

		exception.analyseCode(currentScope, flowContext, flowInfo);
		// need to check that exception thrown is actually caught somewhere
		flowContext.checkExceptionHandlers(exceptionType, this, flowInfo, currentScope);
		return FlowInfo.DeadEnd;
	}

	/**
	 * Throw code generation
	 *
	 * @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope
	 * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
	 */
	public void generateCode(BlockScope currentScope, CodeStream codeStream) {

		if ((bits & IsReachableMASK) == 0)
			return;
		int pc = codeStream.position;
		exception.generateCode(currentScope, codeStream, true);
		codeStream.athrow();
		codeStream.recordPositionsFrom(pc, this);
	}

	public void resolve(BlockScope scope) {
		exceptionType = exception.resolveTypeExpecting(scope, scope.getJavaLangThrowable());
		if (exceptionType == NullBinding)
			scope.problemReporter().cannotThrowNull(this);
		exception.implicitWidening(exceptionType, exceptionType);
	}

	public String toString(int tab) {
		String s = tabString(tab);
		s = s + "throw "; //$NON-NLS-1$
		s = s + exception.toStringExpression();
		return s;
	}

	public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope blockScope) {
		if (visitor.visit(this, blockScope))
			exception.traverse(visitor, blockScope);
		visitor.endVisit(this, blockScope);
	}
}