/* *******************************************************************
* 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 Common Public License v1.0
* which accompanies this distribution and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* PARC initial implementation
* ******************************************************************/
package org.aspectj.ajdt.internal.compiler.ast;
import org.aspectj.weaver.Advice;
import org.aspectj.org.eclipse.jdt.internal.compiler.ASTVisitor;
import org.aspectj.org.eclipse.jdt.internal.compiler.ast.AbstractMethodDeclaration;
import org.aspectj.org.eclipse.jdt.internal.compiler.ast.Expression;
import org.aspectj.org.eclipse.jdt.internal.compiler.ast.MessageSend;
import org.aspectj.org.eclipse.jdt.internal.compiler.ast.NameReference;
import org.aspectj.org.eclipse.jdt.internal.compiler.ast.SingleNameReference;
import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.Binding;
import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.BlockScope;
import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.ClassScope;
import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.LocalVariableBinding;
import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.MethodBinding;
import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.ReferenceBinding;
import org.aspectj.org.eclipse.jdt.internal.compiler.lookup.TypeBinding;
/**
* Takes a method that already has the three extra parameters
* thisJoinPointStaticPart, thisJoinPoint and thisEnclosingJoinPointStaticPart
*/
public class ProceedVisitor extends ASTVisitor {
boolean needsDynamic = false;
boolean needsStatic = false;
boolean needsStaticEnclosing = false;
boolean hasEffectivelyStaticRef = false;
LocalVariableBinding thisJoinPointDec;
LocalVariableBinding thisJoinPointStaticPartDec;
LocalVariableBinding thisEnclosingJoinPointStaticPartDec;
LocalVariableBinding thisJoinPointDecLocal;
LocalVariableBinding thisJoinPointStaticPartDecLocal;
LocalVariableBinding thisEnclosingJoinPointStaticPartDecLocal;
boolean replaceEffectivelyStaticRefs = false;
AbstractMethodDeclaration method;
ProceedVisitor(AbstractMethodDeclaration method) {
this.method = method;
int index = method.arguments.length - 3;
thisJoinPointStaticPartDecLocal = method.scope.locals[index];
thisJoinPointStaticPartDec = method.arguments[index++].binding;
thisJoinPointDecLocal = method.scope.locals[index];
thisJoinPointDec = method.arguments[index++].binding;
thisEnclosingJoinPointStaticPartDecLocal = method.scope.locals[index];
thisEnclosingJoinPointStaticPartDec = method.arguments[index++].binding;
}
public void computeJoinPointParams() {
// walk my body to see what is needed
method.traverse(this, (ClassScope) null);
//??? add support for option to disable this optimization
//System.err.println("check: "+ hasEffectivelyStaticRef + ", " + needsDynamic);
if (hasEffectivelyStaticRef && !needsDynamic) {
// replace effectively static refs with thisJoinPointStaticPart
replaceEffectivelyStaticRefs = true;
needsStatic = true;
method.traverse(this, (ClassScope) null);
}
}
boolean isRef(NameReference ref, Binding binding) {
return ref.binding == binding;
}
boolean isRef(Expression expr, Binding binding) {
//System.err.println("isRef: " + expr + ", " + binding);
return expr != null
&& expr instanceof NameReference
&& isRef((NameReference) expr, binding);
}
public void endVisit(SingleNameReference ref, BlockScope scope) {
if (isRef(ref, thisJoinPointDec))
needsDynamic = true;
else if (isRef(ref, thisJoinPointStaticPartDec))
needsStatic = true;
else if (isRef(ref, thisEnclosingJoinPointStaticPartDec))
needsStaticEnclosing = true;
}
// public void checkAndFix(ASTObject body) {
// this.process(body);
// if (needsFakeStatic && !needsDynamic) {
// if (!this.getCompiler().getOptions().noMetaJoinPointOptimization) {
// makeFakeStatics = true;
// needsStatic = true;
// this.process(body);
// } else {
// needsDynamic = true;
// }
// }
// }
boolean canTreatAsStatic(String id) {
return id.equals("toString")
|| id.equals("toShortString")
|| id.equals("toLongString")
|| id.equals("getKind")
|| id.equals("getSignature")
|| id.equals("getSourceLocation")
|| id.equals("getStaticPart");
}
// boolean canTreatAsStatic(VarExpr varExpr) {
// ASTObject parent = varExpr.getParent();
// if (parent instanceof CallExpr) {
// Method calledMethod = ((CallExpr)parent).getMethod();
// return canTreatAsStatic(calledMethod);
//
// //??? should add a case here to catch
// //??? tjp.getEnclosingExecutionJoinPoint().STATIC_METHOD()
// } else if (parent instanceof BinopExpr) {
// BinopExpr binop = (BinopExpr)parent;
// if (binop.getType().isEquivalent(this.getTypeManager().getStringType())) {
// return true;
// } else {
// return false;
// }
// } else {
// return false;
// }
// }
boolean inBlockThatCantRun = false;
public boolean visit(MessageSend call, BlockScope scope) {
Expression receiver = call.receiver;
if (isRef(receiver, thisJoinPointDec)) {
if (canTreatAsStatic(new String(call.selector))) {
if (replaceEffectivelyStaticRefs) {
replaceEffectivelyStaticRef(call);
} else {
//System.err.println("has static reg");
hasEffectivelyStaticRef = true;
if (call.arguments != null) {
int argumentsLength = call.arguments.length;
for (int i = 0; i < argumentsLength; i++)
call.arguments[i].traverse(this, scope);
}
return false;
}
}
}
return super.visit(call, scope);
}
private void replaceEffectivelyStaticRef(MessageSend call) {
//System.err.println("replace static ref");
NameReference receiver = (NameReference) call.receiver;
receiver.binding = thisJoinPointStaticPartDecLocal; //thisJoinPointStaticPartDec;
receiver.codegenBinding = thisJoinPointStaticPartDecLocal;
call.binding.declaringClass =
(ReferenceBinding) thisJoinPointStaticPartDec.type;
}
public int removeUnusedExtraArguments() {
int extraArgumentFlags = 0;
this.computeJoinPointParams();
MethodBinding binding = method.binding;
int index = binding.parameters.length - 3;
if (needsStaticEnclosing) {
extraArgumentFlags |= Advice.ThisEnclosingJoinPointStaticPart;
} else {
removeParameter(index+2);
}
if (needsDynamic) {
extraArgumentFlags |= Advice.ThisJoinPoint;
} else {
removeParameter(index+1);
}
if (needsStatic) {
extraArgumentFlags |= Advice.ThisJoinPointStaticPart;
} else {
removeParameter(index+0);
}
return extraArgumentFlags;
}
private void removeParameter(int indexToRemove) {
// TypeBinding[] parameters = method.binding.parameters;
method.scope.locals = removeLocalBinding(indexToRemove, method.scope.locals);
method.binding.parameters = removeParameter(indexToRemove, method.binding.parameters);
}
private static TypeBinding[] removeParameter(int index, TypeBinding[] bindings) {
int len = bindings.length;
TypeBinding[] ret = new TypeBinding[len-1];
System.arraycopy(bindings, 0, ret, 0, index);
System.arraycopy(bindings, index+1, ret, index, len-index-1);
return ret;
}
private static LocalVariableBinding[] removeLocalBinding(int index, LocalVariableBinding[] bindings) {
int len = bindings.length;
//??? for performance we should do this in-place
LocalVariableBinding[] ret = new LocalVariableBinding[len-1];
System.arraycopy(bindings, 0, ret, 0, index);
System.arraycopy(bindings, index+1, ret, index, len-index-1);
return ret;
}
}