Copyright (c) 2000, 2016 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
    Stephan Herrmann - Contribution for
							bug 382350 - [1.8][compiler] Unable to invoke inherited default method via I.super.m() syntax
							bug 404649 - [1.8][compiler] detect illegal reference to indirect or redundant super
    Jesper S Moller  - Contributions for
							bug 378674 - "The method can be declared as static" is wrong
/*******************************************************************************
 * Copyright (c) 2000, 2016 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
 *     Stephan Herrmann - Contribution for
 *								bug 382350 - [1.8][compiler] Unable to invoke inherited default method via I.super.m() syntax
 *								bug 404649 - [1.8][compiler] detect illegal reference to indirect or redundant super
 *     Jesper S Moller <jesper@selskabet.org> - Contributions for
 *								bug 378674 - "The method can be declared as static" is wrong
 *******************************************************************************/
package org.eclipse.jdt.internal.compiler.ast;

import org.eclipse.jdt.internal.compiler.ASTVisitor;
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 QualifiedThisReference extends ThisReference {

	public TypeReference qualification;
	ReferenceBinding currentCompatibleType;

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

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

		return flowInfo;
	}

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

		return flowInfo;
	}

	
Code generation for QualifiedThisReference
Params:
currentScope – org.eclipse.jdt.internal.compiler.lookup.BlockScope
codeStream – org.eclipse.jdt.internal.compiler.codegen.CodeStream
valueRequired – boolean/**
	 * Code generation for QualifiedThisReference
	 *
	 * @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;
		if (valueRequired) {
			if ((this.bits & DepthMASK) != 0) {
				Object[] emulationPath =
					currentScope.getEmulationPath(this.currentCompatibleType, true /*only exact match*/, false/*consider enclosing arg*/);
				codeStream.generateOuterAccess(emulationPath, this, this.currentCompatibleType, currentScope);
			} else {
				// nothing particular after all
				codeStream.aload_0();
			}
		}
		codeStream.recordPositionsFrom(pc, this.sourceStart);
	}

	@Override
	public TypeBinding resolveType(BlockScope scope) {

		this.constant = Constant.NotAConstant;
		// X.this is not a param/raw type as denoting enclosing instance
		TypeBinding type = this.qualification.resolveType(scope, true /* check bounds*/);
		if (type == null || !type.isValidBinding()) return null;
		// X.this is not a param/raw type as denoting enclosing instance
		type = type.erasure();

		// resolvedType needs to be converted to parameterized
		if (type instanceof ReferenceBinding) {
			this.resolvedType = scope.environment().convertToParameterizedType((ReferenceBinding) type);
		} else {
			// error case
			this.resolvedType = type;
		}

		// the qualification MUST exactly match some enclosing type name
		// It is possible to qualify 'this' by the name of the current class
		int depth = findCompatibleEnclosing(scope.referenceType().binding, type, scope);
		this.bits &= ~DepthMASK; // flush previous depth if any
		this.bits |= (depth & 0xFF) << DepthSHIFT; // encoded depth into 8 bits

		if (this.currentCompatibleType == null) {
			if (this.resolvedType.isValidBinding())
				scope.problemReporter().noSuchEnclosingInstance(type, this, false);
			// otherwise problem will be reported by the caller
			return this.resolvedType;
		} else {
			scope.tagAsAccessingEnclosingInstanceStateOf(this.currentCompatibleType, false /* type variable access */);
		}

		// Ensure one cannot write code like: B() { super(B.this); }
		if (depth == 0) {
			checkAccess(scope, null);
		} // if depth>0, path emulation will diagnose bad scenarii
		
		MethodScope methodScope = scope.namedMethodScope();
		if (methodScope != null) {
			MethodBinding method = methodScope.referenceMethodBinding();
			if (method != null) {
				TypeBinding receiver = method.receiver;
				while (receiver != null) {
					if (TypeBinding.equalsEquals(receiver, this.resolvedType))
						return this.resolvedType = receiver;
					receiver = receiver.enclosingType();	
				}
			}
		}
		return this.resolvedType;
	}

	int findCompatibleEnclosing(ReferenceBinding enclosingType, TypeBinding type, BlockScope scope) {
		int depth = 0;
		this.currentCompatibleType = enclosingType;
		while (this.currentCompatibleType != null && TypeBinding.notEquals(this.currentCompatibleType, type)) {
			depth++;
			this.currentCompatibleType = this.currentCompatibleType.isStatic() ? null : this.currentCompatibleType.enclosingType();
		}
		return depth;
	}

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

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

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

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

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

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