org.aspectj.weaver.patterns.ConcreteCflowPointcut Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of aspectjmatcher Show documentation
The AspectJ matcher can be used for matching pointcuts independently of any AspectJ compilation or weaving steps. Most notably, this can be used by frameworks such as Spring AOP which utilise the @AspectJ pointcut syntax but implement aspect weaving in a way independent of AspectJ, e.g. using dynamic proxies.
There is a newer version: 1.9.22.1
Show newest version
/* *******************************************************************
 * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
 * All rights reserved.
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Public License v 2.0
 * which accompanies this distribution and is available at
 * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
 *
 * Contributors:
 *     PARC     initial implementation
 * ******************************************************************/

package org.aspectj.weaver.patterns;

import java.io.IOException;
import java.util.List;
import java.util.Map;

import org.aspectj.bridge.ISourceLocation;
import org.aspectj.bridge.Message;
import org.aspectj.util.FuzzyBoolean;
import org.aspectj.weaver.CompressingDataOutputStream;
import org.aspectj.weaver.IntMap;
import org.aspectj.weaver.Member;
import org.aspectj.weaver.MemberImpl;
import org.aspectj.weaver.NameMangler;
import org.aspectj.weaver.ResolvedType;
import org.aspectj.weaver.Shadow;
import org.aspectj.weaver.UnresolvedType;
import org.aspectj.weaver.WeaverMessages;
import org.aspectj.weaver.World;
import org.aspectj.weaver.ast.Expr;
import org.aspectj.weaver.ast.Test;

public class ConcreteCflowPointcut extends Pointcut {
	private final Member cflowField;
	List slots; // exposed for testing
	boolean usesCounter;
	ResolvedType aspect;

	// Can either use a counter or a stack to implement cflow.
	public ConcreteCflowPointcut(ResolvedType aspect, Member cflowField, List slots, boolean usesCounter) {
		this.aspect = aspect;
		this.cflowField = cflowField;
		this.slots = slots;
		this.usesCounter = usesCounter;
		this.pointcutKind = CFLOW;
	}

	public int couldMatchKinds() {
		return Shadow.ALL_SHADOW_KINDS_BITS;
	}

	public FuzzyBoolean fastMatch(FastMatchInfo type) {
		return FuzzyBoolean.MAYBE;
	}

	protected FuzzyBoolean matchInternal(Shadow shadow) {
		// ??? this is not maximally efficient
		// Check we'll be able to do the residue!

		// this bit is for pr145693 - we cannot match at all if one of the types is missing, we will be unable
		// to create the residue
		if (slots != null) {
			for (Slot slot: slots) {
				ResolvedType rt = slot.formalType;
				if (rt.isMissing()) {
					ISourceLocation[] locs = new ISourceLocation[] { getSourceLocation() };
					Message m = new Message(WeaverMessages.format(WeaverMessages.MISSING_TYPE_PREVENTS_MATCH, rt.getName()), "",
							Message.WARNING, shadow.getSourceLocation(), null, locs);
					rt.getWorld().getMessageHandler().handleMessage(m);
					return FuzzyBoolean.NO;
				}
			}
		}
		return FuzzyBoolean.MAYBE;
	}

	// used by weaver when validating bindings
	public int[] getUsedFormalSlots() {
		if (slots == null) {
			return new int[0];
		}
		int[] indices = new int[slots.size()];
		for (int i = 0; i < indices.length; i++) {
			indices[i] = slots.get(i).formalIndex;
		}
		return indices;
	}

	public void write(CompressingDataOutputStream s) throws IOException {
		throw new RuntimeException("unimplemented");
	}

	public void resolveBindings(IScope scope, Bindings bindings) {
		throw new RuntimeException("unimplemented");
	}

	public Pointcut parameterizeWith(Map typeVariableMap, World w) {
		throw new RuntimeException("unimplemented");
	}

	public boolean equals(Object other) {
		if (!(other instanceof ConcreteCflowPointcut)) {
			return false;
		}
		ConcreteCflowPointcut o = (ConcreteCflowPointcut) other;
		return o.cflowField.equals(this.cflowField);
	}

	public int hashCode() {
		int result = 17;
		result = 37 * result + cflowField.hashCode();
		return result;
	}

	public String toString() {
		return "concretecflow(" + cflowField + ")";
	}

	protected Test findResidueInternal(Shadow shadow, ExposedState state) {
		// System.out.println("find residue: " + this);
		if (usesCounter) {
			return Test.makeFieldGetCall(cflowField, cflowCounterIsValidMethod, Expr.NONE);
		} else {
			if (slots != null) { // null for cflows managed by counters
				for (Slot slot: slots) {
					// System.out.println("slot: " + slot.formalIndex);
					state.set(slot.formalIndex,
							aspect.getWorld().getWeavingSupport().makeCflowAccessVar(slot.formalType, cflowField, slot.arrayIndex));
				}
			}
			return Test.makeFieldGetCall(cflowField, cflowStackIsValidMethod, Expr.NONE);
		}
	}

	private static final Member cflowStackIsValidMethod = MemberImpl.method(NameMangler.CFLOW_STACK_UNRESOLVEDTYPE, 0,
			UnresolvedType.BOOLEAN, "isValid", UnresolvedType.NONE);

	private static final Member cflowCounterIsValidMethod = MemberImpl.method(NameMangler.CFLOW_COUNTER_UNRESOLVEDTYPE, 0,
			UnresolvedType.BOOLEAN, "isValid", UnresolvedType.NONE);

	public Pointcut concretize1(ResolvedType inAspect, ResolvedType declaringType, IntMap bindings) {
		throw new RuntimeException("unimplemented");
	}

	public Object accept(PatternNodeVisitor visitor, Object data) {
		return visitor.visit(this, data);
	}

	public static class Slot {
		int formalIndex;
		ResolvedType formalType;
		int arrayIndex;

		public Slot(int formalIndex, ResolvedType formalType, int arrayIndex) {
			this.formalIndex = formalIndex;
			this.formalType = formalType;
			this.arrayIndex = arrayIndex;
		}

		public boolean equals(Object other) {
			if (!(other instanceof Slot)) {
				return false;
			}

			Slot o = (Slot) other;
			return o.formalIndex == this.formalIndex && o.arrayIndex == this.arrayIndex && o.formalType.equals(this.formalType);
		}

		public int hashCode() {
			int result = 19;
			result = 37 * result + formalIndex;
			result = 37 * result + arrayIndex;
			result = 37 * result + formalType.hashCode();
			return result;
		}

		public String toString() {
			return "Slot(" + formalIndex + ", " + formalType + ", " + arrayIndex + ")";
		}
	}

}