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/* FJBG -- Fast Java Bytecode Generator
* Copyright 2002-2011 LAMP/EPFL
* @author Michel Schinz
*/
package ch.epfl.lamp.fjbg;
import java.io.DataInputStream;
import java.io.IOException;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
/**
* Representation of a Java method.
*
* @author Michel Schinz
* @version 1.0
*/
public class JMethod extends JFieldOrMethod {
public final static String CLASS_CONSTRUCTOR_NAME = "<clinit>";
public final static String INSTANCE_CONSTRUCTOR_NAME = "<init>";
protected /*final*/ JCode code;
protected final String[] argNames;
protected final LinkedList/*<JLocalVariable>*/ localVariables =
new LinkedList();
protected int localVariableIndex = 0;
protected JMethod(FJBGContext context,
JClass owner,
int accessFlags,
String name,
JType returnType,
JType[] argTypes,
String[] argNames) {
super(context,
owner,
accessFlags,
name,
new JMethodType(returnType, argTypes));
this.argNames = argNames;
assert argTypes.length == argNames.length;
if (isAbstract() || isNative()) {
code = null;
} else {
code = context.JCode(owner, this);
addAttribute(context.JCodeAttribute(owner, this));
if (!isStatic())
addNewLocalVariable(owner.getType(), "this");
for (int i = 0; i < argTypes.length; ++i)
addNewLocalVariable(argTypes[i], argNames[i]);
}
}
protected JMethod(FJBGContext context,
JClass owner,
DataInputStream stream)
throws IOException {
super(context, owner, stream);
assert isAbstract() || isNative() || code != null;
int n = 0;
if (code != null) {
for (Iterator it = code.getAttributes().iterator(); it.hasNext(); ) {
JAttribute attr = (JAttribute)it.next();
if (attr instanceof JLocalVariableTableAttribute)
n = ((JLocalVariableTableAttribute)attr).getMaxLocals();
}
}
this.localVariableIndex = n;
JType[] argTypes = ((JMethodType)getType()).getArgumentTypes();
argNames = new String[argTypes.length]; // TODO get from attribute
for (int i = 0; i < argNames.length; ++i)
argNames[i] = "v"+i;
}
public void freeze() throws JCode.OffsetTooBigException {
if (code != null) code.freeze();
super.freeze();
}
public JType getReturnType() {
return ((JMethodType)type).getReturnType();
}
public JType[] getArgumentTypes() {
return ((JMethodType)type).getArgumentTypes();
}
public int getArgsSize() {
int size = ((JMethodType)type).getArgsSize();
if (!isStatic()) size += 1; // for this
return size;
}
public String[] getArgumentNames() {
return argNames;
}
public JCode getCode() {
assert !isAbstract();
return code;
}
// Invoked by the JCode constructor
protected void setCode(JCode code) {
assert null == this.code;
this.code = code;
}
public JCodeIterator codeIterator() {
return new JCodeIterator(code);
}
// Local variables
// FIXME : find a better management method for local variables
public JLocalVariable addNewLocalVariable(JType type, String name) {
assert !frozen;
JLocalVariable var =
context.JLocalVariable(this, type, name, localVariableIndex);
localVariableIndex += type.getSize();
localVariables.add(var);
return var;
}
public JLocalVariable getLocalVariable(int index) {
for (int i = 0; i < localVariables.size(); i++) {
if (((JLocalVariable)localVariables.get(i)).index == index)
return (JLocalVariable)localVariables.get(i);
}
return null;
}
public JLocalVariable[] getLocalVariables() {
return (JLocalVariable[])localVariables
.toArray(new JLocalVariable[localVariables.size()]);
}
public int getMaxLocals() {
return localVariableIndex;
}
// Follows javap output format for methods.
/*@Override*/ public String toString() {
StringBuffer buf = new StringBuffer(flagsToString());
String name = getName();
if (CLASS_CONSTRUCTOR_NAME.equals(name))
buf.append("{}");
else {
if (INSTANCE_CONSTRUCTOR_NAME.equals(name))
name = getOwner().getName();
else {
buf.append(toExternalName(getReturnType()));
buf.append(" ");
}
buf.append(toExternalName(name));
buf.append("(");
JType[] ts = getArgumentTypes();
for (int i = 0; i < ts.length; ++i) {
if (i > 0) buf.append(", ");
buf.append(toExternalName(ts[i]));
}
buf.append(")");
}
buf.append(";\n");
Iterator it = attributes.iterator();
while(it.hasNext()) {
JAttribute attr = (JAttribute)it.next();
buf.append(attr);
}
return buf.toString();
}
private String flagsToString() {
StringBuffer buf = new StringBuffer();
if (isPublic()) buf.append("public ");
else if (isProtected()) buf.append("protected ");
else if (isPrivate()) buf.append("private ");
if (isBridge()) buf.append("<bridge> ");
if (hasVarargs()) buf.append("<varargs> ");
if (isStatic()) buf.append("static ");
else if (isNative()) buf.append("native ");
if (isAbstract()) buf.append("abstract ");
else if (isFinal()) buf.append("final ");
if (isSynchronized()) buf.append("synchronized ");
return buf.toString();
}
}
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