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RoboVM fork of Soot - A Java optimization framework
/* Soot - a J*va Optimization Framework
* Copyright (C) 1997-1999 Raja Vallee-Rai
* Copyright (C) 2004 Ondrej Lhotak
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the Sable Research Group and others 1997-1999.
* See the 'credits' file distributed with Soot for the complete list of
* contributors. (Soot is distributed at http://www.sable.mcgill.ca/soot)
*/
package soot;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.StringTokenizer;
import soot.jimple.toolkits.callgraph.VirtualCalls;
import soot.tagkit.AbstractHost;
import soot.util.IterableSet;
import soot.util.Numberable;
import soot.util.NumberedString;
/**
Soot representation of a Java method. Can be declared to belong to a SootClass.
Does not contain the actual code, which belongs to a Body.
The getActiveBody() method points to the currently-active body.
*/
public class SootMethod
extends AbstractHost
implements ClassMember, Numberable, MethodOrMethodContext {
public static final String constructorName = "";
public static final String staticInitializerName = "";
public static boolean DEBUG=false;
/** Name of the current method. */
String name;
/** A list of parameter types taken by this SootMethod object,
* in declaration order. */
List parameterTypes;
/** The return type of this object. */
Type returnType;
/** True when some SootClass object declares this SootMethod object. */
boolean isDeclared;
/** Holds the class which declares this SootClass method. */
SootClass declaringClass;
/** Modifiers associated with this SootMethod (e.g. private, protected, etc.) */
int modifiers;
/** Is this method a phantom method? */
boolean isPhantom = false;
/** Declared exceptions thrown by this method. Created upon demand. */
List exceptions = null;
/** Active body associated with this method. */
Body activeBody;
/** Tells this method how to find out where its body lives. */
protected MethodSource ms;
/** Uses methodSource to retrieve the method body in question; does not set it
* to be the active body.
*
* @param phaseName Phase name for body loading. */
private Body getBodyFromMethodSource(String phaseName) {
return ms.getBody(this, phaseName);
}
/** Sets the MethodSource of the current SootMethod. */
public void setSource(MethodSource ms) {
this.ms = ms;
}
/** Returns the MethodSource of the current SootMethod. */
public MethodSource getSource() {
return ms;
}
/** Returns a hash code for this method consistent with structural equality. */
public int equivHashCode() {
return returnType.hashCode() * 101 + modifiers * 17 + name.hashCode();
}
/** Constructs a SootMethod with the given name, parameter types and return type. */
public SootMethod(String name, List parameterTypes, Type returnType) {
this(name, parameterTypes, returnType, 0, Collections.emptyList());
}
/** Constructs a SootMethod with the given name, parameter types, return type and modifiers. */
public SootMethod(
String name,
List parameterTypes,
Type returnType,
int modifiers) {
this(name, parameterTypes, returnType, modifiers, Collections.emptyList());
}
/** Constructs a SootMethod with the given name, parameter types, return type,
* and list of thrown exceptions. */
public SootMethod(
String name,
List parameterTypes,
Type returnType,
int modifiers,
List thrownExceptions) {
this.name = name;
this.parameterTypes = new ArrayList();
this.parameterTypes.addAll(parameterTypes);
this.parameterTypes = Collections.unmodifiableList(this.parameterTypes);
this.returnType = returnType;
this.modifiers = modifiers;
if (exceptions == null && !thrownExceptions.isEmpty()) {
exceptions = new ArrayList();
this.exceptions.addAll(thrownExceptions);
/*DEBUG=true;
if(DEBUG)
System.out.println("Added thrown exceptions"+thrownExceptions);
DEBUG=false;
*/
}
Scene.v().getMethodNumberer().add(this);
subsignature =
Scene.v().getSubSigNumberer().findOrAdd(getSubSignature());
}
/** Returns the name of this method. */
public String getName() {
return name;
}
/** Nomair A. Naeem , January 14th 2006
* Need it for the decompiler to create a new SootMethod
* The SootMethod can be created fine but when one tries to create a SootMethodRef there is an error because
* there is no declaring class set. Dava cannot add the method to the class until after it has ended decompiling
* the remaining method (new method added is added in the PackManager)
* It would make sense to setDeclared to true within this method too. However later when the sootMethod is added it checks
* that the method is not set to declared (isDeclared).
*/
public void setDeclaringClass(SootClass declClass){
if(declClass != null){
declaringClass=declClass;
//setDeclared(true);
}
}
/** Returns the class which declares the current SootMethod. */
public SootClass getDeclaringClass() {
if (!isDeclared)
throw new RuntimeException("not declared: " + getName());
return declaringClass;
}
public void setDeclared(boolean isDeclared) {
this.isDeclared = isDeclared;
}
/** Returns true when some SootClass object declares this SootMethod object. */
public boolean isDeclared() {
return isDeclared;
}
/** Returns true when this SootMethod object is phantom. */
public boolean isPhantom() {
return isPhantom;
}
/**
* Returns true if this method is not phantom, abstract or native, i.e. this method can have a body.
*/
public boolean isConcrete() {
return !isPhantom() && !isAbstract() && !isNative();
}
/** Sets the phantom flag on this method. */
public void setPhantom(boolean value) {
if (value) {
if (!Scene.v().allowsPhantomRefs())
throw new RuntimeException("Phantom refs not allowed");
if (declaringClass != null && !declaringClass.isPhantom())
throw new RuntimeException("Declaring class would have to be phantom");
}
isPhantom = value;
}
/** Sets the name of this method. */
public void setName(String name) {
boolean wasDeclared = isDeclared;
SootClass oldDeclaringClass = declaringClass;
if( wasDeclared ) oldDeclaringClass.removeMethod(this);
this.name = name;
subsignature =
Scene.v().getSubSigNumberer().findOrAdd(getSubSignature());
if( wasDeclared) oldDeclaringClass.addMethod(this);
}
/** Gets the modifiers of this method.
* @see soot.Modifier */
public int getModifiers() {
return modifiers;
}
/** Sets the modifiers of this method.
* @see soot.Modifier */
public void setModifiers(int modifiers) {
// RoboVM note: We allow all classes to be modified
// if ((declaringClass != null) && (!declaringClass.isApplicationClass()))
// throw new RuntimeException("Cannot set modifiers of a method from a non-app class!");
this.modifiers = modifiers;
}
/** Returns the return type of this method. */
public Type getReturnType() {
return returnType;
}
/** Sets the return type of this method. */
public void setReturnType(Type t) {
boolean wasDeclared = isDeclared;
SootClass oldDeclaringClass = declaringClass;
if( wasDeclared ) oldDeclaringClass.removeMethod(this);
returnType = t;
subsignature =
Scene.v().getSubSigNumberer().findOrAdd(getSubSignature());
if( wasDeclared) oldDeclaringClass.addMethod(this);
}
/** Returns the number of parameters taken by this method. */
public int getParameterCount() {
return parameterTypes.size();
}
/** Gets the type of the nth parameter of this method. */
public Type getParameterType(int n) {
return (Type) parameterTypes.get(n);
}
/**
* Returns a read-only list of the parameter types of this method.
*/
public List getParameterTypes() {
return parameterTypes;
}
/**
* Changes the set of parameter types of this method.
*/
public void setParameterTypes( List l ) {
boolean wasDeclared = isDeclared;
SootClass oldDeclaringClass = declaringClass;
if( wasDeclared ) oldDeclaringClass.removeMethod(this);
List al = new ArrayList();
al.addAll(l);
this.parameterTypes = Collections.unmodifiableList(al);
subsignature =
Scene.v().getSubSigNumberer().findOrAdd(getSubSignature());
if( wasDeclared) oldDeclaringClass.addMethod(this);
}
/**
Retrieves the active body for this method.
*/
public Body getActiveBody() {
if (declaringClass!=null && declaringClass.isPhantomClass())
throw new RuntimeException(
"cannot get active body for phantom class: " + getSignature());
// ignore empty body exceptions if we are just computing coffi metrics
if (!hasActiveBody())
throw new RuntimeException(
"no active body present for method " + getSignature());
return activeBody;
}
/**
* Returns the active body if present, else constructs an active body and returns that.
*
* If you called Scene.v().loadClassAndSupport() for a class yourself, it will
* not be an application class, so you cannot get retrieve its active body.
* Please call setApplicationClass() on the relevant class.
*/
public Body retrieveActiveBody() {
declaringClass.checkLevel(SootClass.BODIES);
if (declaringClass.isPhantomClass())
throw new RuntimeException(
"cannot get resident body for phantom class : "
+ getSignature()
+ "; maybe you want to call c.setApplicationClass() on this class!");
if (!hasActiveBody()) {
// G.v().out.println("Retrieving "+this.getSignature());
setActiveBody(this.getBodyFromMethodSource("jb"));
ms = null;
}
return getActiveBody();
}
/**
Sets the active body for this method.
*/
public void setActiveBody(Body body) {
if ((declaringClass != null)
&& declaringClass.isPhantomClass())
throw new RuntimeException(
"cannot set active body for phantom class! " + this);
if (!isConcrete())
throw new RuntimeException(
"cannot set body for non-concrete method! " + this);
if (body!= null && body.getMethod() != this)
body.setMethod(this);
activeBody = body;
}
/** Returns true if this method has an active body. */
public boolean hasActiveBody() {
return activeBody != null;
}
/** Releases the active body associated with this method. */
public void releaseActiveBody() {
activeBody = null;
}
/** Adds the given exception to the list of exceptions thrown by this method
* unless the exception is already in the list. */
public void addExceptionIfAbsent(SootClass e) {
if( !throwsException(e) ) addException(e);
}
/** Adds the given exception to the list of exceptions thrown by this method. */
public void addException(SootClass e) {
if(DEBUG)
System.out.println("Adding exception "+e);
if (exceptions == null)
exceptions = new ArrayList();
else if (exceptions.contains(e))
throw new RuntimeException(
"already throws exception " + e.getName());
exceptions.add(e);
}
/** Removes the given exception from the list of exceptions thrown by this method. */
public void removeException(SootClass e) {
if(DEBUG)
System.out.println("Removing exception "+e);
if (exceptions == null)
exceptions = new ArrayList();
if (!exceptions.contains(e))
throw new RuntimeException(
"does not throw exception " + e.getName());
exceptions.remove(e);
}
/** Returns true if this method throws exception e. */
public boolean throwsException(SootClass e) {
return exceptions != null && exceptions.contains(e);
}
public void setExceptions(List exceptions) {
this.exceptions = new ArrayList();
this.exceptions.addAll(exceptions);
}
/**
* Returns a backed list of the exceptions thrown by this method.
*/
public List getExceptions() {
if (exceptions == null)
exceptions = new ArrayList();
return exceptions;
}
/**
* Convenience method returning true if this method is static.
*/
public boolean isStatic() {
return Modifier.isStatic(this.getModifiers());
}
/**
* Convenience method returning true if this method is private.
*/
public boolean isPrivate() {
return Modifier.isPrivate(this.getModifiers());
}
/**
* Convenience method returning true if this method is public.
*/
public boolean isPublic() {
return Modifier.isPublic(this.getModifiers());
}
/**
* Convenience method returning true if this method is protected.
*/
public boolean isProtected() {
return Modifier.isProtected(this.getModifiers());
}
/**
* Convenience method returning true if this method is abstract.
*/
public boolean isAbstract() {
return Modifier.isAbstract(this.getModifiers());
}
/**
* Convenience method returning true if this method is native.
*/
public boolean isNative() {
return Modifier.isNative(this.getModifiers());
}
/**
* Convenience method returning true if this method is synchronized.
*/
public boolean isSynchronized() {
return Modifier.isSynchronized(this.getModifiers());
}
/**
*
* @return yes if this is the main method
*/
public boolean isMain()
{
if ( isPublic() && isStatic() ) {
NumberedString main_sig = Scene.v().getSubSigNumberer().findOrAdd( "void main(java.lang.String[])" );
if ( main_sig.equals( subsignature ) )
return true;
}
return false;
}
/**
*
* @return yes, if this function is a constructor.
*/
public boolean isConstructor()
{
return name.equals(constructorName);
}
/**
* @return yes, if this is a class initializer or main function.
*/
public boolean isEntryMethod()
{
if ( isStatic() &&
subsignature.equals( VirtualCalls.v().sigClinit ) )
return true;
return isMain();
}
/**
* We rely on the JDK class recognition to decide if a method is JDK method.
*/
public boolean isJavaLibraryMethod()
{
SootClass cl = getDeclaringClass();
return cl.isJavaLibraryClass();
}
/**
Returns the Soot signature of this method. Used to refer to methods unambiguously.
*/
public String getSignature() {
return getSignature(getDeclaringClass(), getName(), getParameterTypes(), getReturnType());
}
public static String getSignature(SootClass cl, String name, List params, Type returnType) {
StringBuffer buffer = new StringBuffer();
buffer.append(
"<" + Scene.v().quotedNameOf(cl.getName()) + ": ");
buffer.append(getSubSignatureImpl(name, params, returnType));
buffer.append(">");
// Again, memory-usage tweak depending on JDK implementation due
// to Michael Pan.
return buffer.toString().intern();
}
/**
Returns the Soot subsignature of this method. Used to refer to methods unambiguously.
*/
public String getSubSignature() {
String name = getName();
List params = getParameterTypes();
Type returnType = getReturnType();
return getSubSignatureImpl(name, params, returnType);
}
public static String getSubSignature(
String name,
List params,
Type returnType) {
return getSubSignatureImpl(name, params, returnType);
}
private static String getSubSignatureImpl(
String name,
List params,
Type returnType) {
StringBuffer buffer = new StringBuffer();
Type t = returnType;
// RoboVM note: Optimization
//buffer.append(t.toString() + " " + Scene.v().quotedNameOf(name) + "(");
buffer.append(t.toString());
buffer.append(' ');
buffer.append(Scene.v().quotedNameOf(name) + "(");
Iterator typeIt = params.iterator();
if (typeIt.hasNext()) {
t = (Type) typeIt.next();
buffer.append(t);
while (typeIt.hasNext()) {
buffer.append(",");
t = (Type) typeIt.next();
buffer.append(t);
}
}
buffer.append(")");
// RoboVM note: Optimization
//return buffer.toString().intern();
return buffer.toString();
}
private NumberedString subsignature;
public NumberedString getNumberedSubSignature() {
return subsignature;
}
/** Returns the signature of this method. */
public String toString() {
return getSignature();
}
/**
* Returns the declaration of this method, as used at the top of textual body representations
* (before the {}'s containing the code for representation.)
*/
public String getDeclaration() {
StringBuffer buffer = new StringBuffer();
// modifiers
StringTokenizer st =
new StringTokenizer(Modifier.toString(this.getModifiers()));
if (st.hasMoreTokens())
buffer.append(st.nextToken());
// RoboVM note: optimization
// while (st.hasMoreTokens())
// buffer.append(" " + st.nextToken());
//
// if (buffer.length() != 0)
// buffer.append(" ");
while (st.hasMoreTokens())
buffer.append(' ').append(st.nextToken());
if (buffer.length() != 0)
buffer.append(' ');
// return type + name
// RoboVM note: optimization
// buffer.append(this.getReturnType() + " ");
// buffer.append(Scene.v().quotedNameOf(this.getName()));
//
// buffer.append("(");
buffer.append(this.getReturnType()).append(' ');
buffer.append(Scene.v().quotedNameOf(this.getName()));
buffer.append('(');
// parameters
Iterator typeIt = this.getParameterTypes().iterator();
//int count = 0;
while (typeIt.hasNext()) {
Type t = (Type) typeIt.next();
buffer.append(t);
if (typeIt.hasNext())
buffer.append(", ");
}
buffer.append(")");
// Print exceptions
if (exceptions != null) {
Iterator exceptionIt = this.getExceptions().iterator();
// RoboVM note: optimization
// if (exceptionIt.hasNext()) {
// buffer.append(
// " throws " + exceptionIt.next().getName());
//
// while (exceptionIt.hasNext()) {
// buffer.append(
// ", " + exceptionIt.next().getName());
// }
// }
if (exceptionIt.hasNext()) {
buffer.append(
" throws ").append(exceptionIt.next().getName());
while (exceptionIt.hasNext()) {
buffer.append(
", ").append(exceptionIt.next().getName());
}
}
}
// RoboVM note: Optimization
//return buffer.toString().intern();
return buffer.toString().intern();
}
public final int getNumber() {
return number;
}
public final void setNumber(int number) {
this.number = number;
}
private int number = 0;
public SootMethod method() { return this; }
public Context context() { return null; }
public SootMethodRef makeRef() {
return Scene.v().makeMethodRef( declaringClass, name, parameterTypes, returnType, isStatic() );
}
}