Copyright (c) 2000, 2017 IBM Corporation and others.
This program and the accompanying materials
are made available under the terms of the Eclipse Public License 2.0
which accompanies this distribution, and is available at
https://www.eclipse.org/legal/epl-2.0/
SPDX-License-Identifier: EPL-2.0
Contributors:
    IBM Corporation - initial API and implementation
/*******************************************************************************
 * Copyright (c) 2000, 2017 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.compiler.ast;

import org.eclipse.jdt.internal.compiler.ASTVisitor;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants;
import org.eclipse.jdt.internal.compiler.codegen.*;
import org.eclipse.jdt.internal.compiler.flow.*;
import org.eclipse.jdt.internal.compiler.impl.Constant;
import org.eclipse.jdt.internal.compiler.lookup.*;

public class ClassLiteralAccess extends Expression {

	public TypeReference type;
	public TypeBinding targetType;
	FieldBinding syntheticField;

	public ClassLiteralAccess(int sourceEnd, TypeReference type) {
		this.type = type;
		type.bits |= IgnoreRawTypeCheck; // no need to worry about raw type usage
		this.sourceStart = type.sourceStart;
		this.sourceEnd = sourceEnd;
	}

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

		// if reachable, request the addition of a synthetic field for caching the class descriptor
		SourceTypeBinding sourceType = currentScope.outerMostClassScope().enclosingSourceType();
		// see https://bugs.eclipse.org/bugs/show_bug.cgi?id=22334
		if (!sourceType.isInterface()
				&& !this.targetType.isBaseType()
				&& currentScope.compilerOptions().targetJDK < ClassFileConstants.JDK1_5) {
			this.syntheticField = sourceType.addSyntheticFieldForClassLiteral(this.targetType, currentScope);
		}
		return flowInfo;
	}

	
MessageSendDotClass code generation
Params:
currentScope – org.eclipse.jdt.internal.compiler.lookup.BlockScope
codeStream – org.eclipse.jdt.internal.compiler.codegen.CodeStream
valueRequired – boolean/**
	 * MessageSendDotClass code generation
	 *
	 * @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope
	 * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
	 * @param valueRequired boolean
	 */
	@Override
	public void generateCode(
		BlockScope currentScope,
		CodeStream codeStream,
		boolean valueRequired) {
		int pc = codeStream.position;

		// in interface case, no caching occurs, since cannot make a cache field for interface
		if (valueRequired) {
			codeStream.generateClassLiteralAccessForType(currentScope, this.type.resolvedType, this.syntheticField);
			codeStream.generateImplicitConversion(this.implicitConversion);
		}
		codeStream.recordPositionsFrom(pc, this.sourceStart);
	}

	@Override
	public StringBuffer printExpression(int indent, StringBuffer output) {

		return this.type.print(0, output).append(".class"); //$NON-NLS-1$
	}

	@Override
	public TypeBinding resolveType(BlockScope scope) {

		this.constant = Constant.NotAConstant;
		if ((this.targetType = this.type.resolveType(scope, true /* check bounds*/)) == null)
			return null;
		
		/* https://bugs.eclipse.org/bugs/show_bug.cgi?id=320463
		   https://bugs.eclipse.org/bugs/show_bug.cgi?id=312076
		   JLS3 15.8.2 forbids the type named in the class literal expression from being a parameterized type.
		   And the grammar in 18.1 disallows (where X and Y are some concrete types) constructs of the form
		   Outer<X>.class, Outer<X>.Inner.class, Outer.Inner<X>.class, Outer<X>.Inner<Y>.class etc.
		   Corollary wise, we should resolve the type of the class literal expression to be a raw type as
		   class literals exist only for the raw underlying type. 
		 */
		LookupEnvironment environment = scope.environment();
		this.targetType = environment.convertToRawType(this.targetType, true /* force conversion of enclosing types*/);

		if (this.targetType.isArrayType()) {
			ArrayBinding arrayBinding = (ArrayBinding) this.targetType;
			TypeBinding leafComponentType = arrayBinding.leafComponentType;
			if (leafComponentType == TypeBinding.VOID) {
				scope.problemReporter().cannotAllocateVoidArray(this);
				return null;
			} else if (leafComponentType.isTypeVariable()) {
				scope.problemReporter().illegalClassLiteralForTypeVariable((TypeVariableBinding)leafComponentType, this);
			}
		} else if (this.targetType.isTypeVariable()) {
			scope.problemReporter().illegalClassLiteralForTypeVariable((TypeVariableBinding)this.targetType, this);
		}
		ReferenceBinding classType = scope.getJavaLangClass();
		// https://bugs.eclipse.org/bugs/show_bug.cgi?id=328689
		if (scope.compilerOptions().sourceLevel >= ClassFileConstants.JDK1_5) {
			// Integer.class --> Class<Integer>, perform boxing of base types (int.class --> Class<Integer>)
			TypeBinding boxedType = null;
			if (this.targetType.id == T_void) {
				boxedType = environment.getResolvedJavaBaseType(JAVA_LANG_VOID, scope);
			} else {
				boxedType = scope.boxing(this.targetType);
			}
			if (environment.usesNullTypeAnnotations())
				boxedType = environment.createAnnotatedType(boxedType, new AnnotationBinding[] { environment.getNonNullAnnotation() });
			this.resolvedType = environment.createParameterizedType(classType, new TypeBinding[]{ boxedType }, null/*not a member*/);
		} else {
			this.resolvedType = classType;
		}
		return this.resolvedType;
	}

	@Override
	public void traverse(
		ASTVisitor visitor,
		BlockScope blockScope) {

		if (visitor.visit(this, blockScope)) {
			this.type.traverse(visitor, blockScope);
		}
		visitor.endVisit(this, blockScope);
	}
}