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/*
* Copyright (c) 1998, 2004, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.tools.jdi;
import com.sun.jdi.*;
public class LocalVariableImpl extends MirrorImpl
implements LocalVariable, ValueContainer
{
private final Method method;
private final int slot;
private final Location scopeStart;
private final Location scopeEnd;
private final String name;
private final String signature;
private String genericSignature = null;
LocalVariableImpl(VirtualMachine vm, Method method,
int slot, Location scopeStart, Location scopeEnd,
String name, String signature,
String genericSignature) {
super(vm);
this.method = method;
this.slot = slot;
this.scopeStart = scopeStart;
this.scopeEnd = scopeEnd;
this.name = name;
this.signature = signature;
if (genericSignature != null && genericSignature.length() > 0) {
this.genericSignature = genericSignature;
} else {
// The Spec says to return null for non-generic types
this.genericSignature = null;
}
}
public boolean equals(Object obj) {
if ((obj != null) && (obj instanceof LocalVariableImpl)) {
LocalVariableImpl other = (LocalVariableImpl)obj;
return ((slot() == other.slot()) &&
(scopeStart != null) &&
(scopeStart.equals(other.scopeStart)) &&
(super.equals(obj)));
} else {
return false;
}
}
public int hashCode() {
/*
* TO DO: Better hash code
*/
return ((scopeStart.hashCode() << 4) + slot());
}
public int compareTo(LocalVariable object) {
LocalVariableImpl other = (LocalVariableImpl)object;
int rc = scopeStart.compareTo(other.scopeStart);
if (rc == 0) {
rc = slot() - other.slot();
}
return rc;
}
public String name() {
return name;
}
/**
* @return a text representation of the declared type
* of this variable.
*/
public String typeName() {
JNITypeParser parser = new JNITypeParser(signature);
return parser.typeName();
}
public Type type() throws ClassNotLoadedException {
return findType(signature());
}
public Type findType(String signature) throws ClassNotLoadedException {
ReferenceTypeImpl enclosing = (ReferenceTypeImpl)method.declaringType();
return enclosing.findType(signature);
}
public String signature() {
return signature;
}
public String genericSignature() {
return genericSignature;
}
public boolean isVisible(StackFrame frame) {
validateMirror(frame);
Method frameMethod = frame.location().method();
if (!frameMethod.equals(method)) {
throw new IllegalArgumentException(
"frame method different than variable's method");
}
// this is here to cover the possibility that we will
// allow LocalVariables for native methods. If we do
// so we will have to re-examinine this.
if (frameMethod.isNative()) {
return false;
}
return ((scopeStart.compareTo(frame.location()) <= 0)
&& (scopeEnd.compareTo(frame.location()) >= 0));
}
public boolean isArgument() {
try {
MethodImpl method = (MethodImpl)scopeStart.method();
return (slot < method.argSlotCount());
} catch (AbsentInformationException e) {
// If this variable object exists, there shouldn't be absent info
throw new InternalException();
}
}
int slot() {
return slot;
}
/*
* Compilers/VMs can have byte code ranges for variables of the
* same names that overlap. This is because the byte code ranges
* aren't necessarily scopes; they may have more to do with the
* lifetime of the variable's slot, depending on implementation.
*
* This method determines whether this variable hides an
* identically named variable; ie, their byte code ranges overlap
* this one starts after the given one. If it returns true this
* variable should be preferred when looking for a single variable
* with its name when both variables are visible.
*/
boolean hides(LocalVariable other) {
LocalVariableImpl otherImpl = (LocalVariableImpl)other;
if (!method.equals(otherImpl.method) ||
!name.equals(otherImpl.name)) {
return false;
} else {
return (scopeStart.compareTo(otherImpl.scopeStart) > 0);
}
}
public String toString() {
return name() + " in " + method.toString() +
"@" + scopeStart.toString();
}
}