// string addition assign expression
public void createBCode(CodeGeneration gen) {
TypeDecl dest = getDest().type();
TypeDecl source = getSource().type();
if (dest.isString()) {
getDest().createAssignLoadDest(gen);
// new StringBuffer()
TypeDecl stringBuffer = lookupType("java.lang", "StringBuffer");
String classname = stringBuffer.constantPoolName();
String desc;
int index;
TypeDecl argumentType;
stringBuffer.emitNew(gen); // new StringBuffer
gen.emitDup(); // dup
desc = "()V";
index = gen.constantPool().addMethodref(classname, "<init>", desc);
gen.emit(Bytecode.INVOKESPECIAL, -1).add2(index); // invokespecial StringBuffer()
gen.emitSwap();
// append
argumentType = dest.stringPromotion();
desc = "(" + argumentType.typeDescriptor() + ")" + stringBuffer.typeDescriptor();
index = gen.constantPool().addMethodref(classname, "append", desc);
gen.emit(Bytecode.INVOKEVIRTUAL, -argumentType.variableSize())
.add2(index); // StringBuffer.append
getSource().createBCode(gen);
// typed append
argumentType = source.stringPromotion();
desc = "(" + argumentType.typeDescriptor() + ")" + stringBuffer.typeDescriptor();
index = gen.constantPool().addMethodref(classname, "append", desc);
gen.emit(Bytecode.INVOKEVIRTUAL, -argumentType.variableSize())
.add2(index); // StringBuffer.append
// toString
desc = "()" + type().typeDescriptor();
index = gen.constantPool().addMethodref(classname, "toString", desc);
gen.emit(Bytecode.INVOKEVIRTUAL, 0).add2(index); // StringBuffer.toString
if (needsPush()) {
getDest().createPushAssignmentResult(gen);
}
getDest().emitStore(gen);
} else {
super.createBCode(gen);
}
}
/**
* @ast method
* @aspect GenerateClassfile
* @declaredat /home/uoji/JastAddJ/Java1.4Backend/GenerateClassfile.jrag:142
*/
public void generateClassfile() {
super.generateClassfile();
String fileName = destinationPath() + File.separator + constantPoolName() + ".class";
if (options().verbose()) System.out.println("Writing class file to " + fileName);
try {
ConstantPool cp = constantPool();
// force building of constant pool
cp.addClass(constantPoolName());
cp.addClass("java/lang/Object");
for (int i = 0; i < getNumSuperInterfaceId(); i++) {
cp.addClass(getSuperInterfaceId(i).type().constantPoolName());
}
for (Iterator iter = bcFields().iterator(); iter.hasNext(); ) {
FieldDeclaration field = (FieldDeclaration) iter.next();
cp.addUtf8(field.name());
cp.addUtf8(field.type().typeDescriptor());
field.attributes();
}
for (Iterator iter = bcMethods().iterator(); iter.hasNext(); ) {
Object obj = iter.next();
if (obj instanceof MethodDecl) {
MethodDecl m = (MethodDecl) obj;
cp.addUtf8(m.name());
cp.addUtf8(m.descName());
m.attributes();
}
}
attributes();
if (hasClinit()) {
cp.addUtf8("<clinit>");
cp.addUtf8("()V");
clinit_attributes();
}
// actual classfile generation
File dest = new File(fileName);
File parentFile = dest.getParentFile();
if (parentFile != null) parentFile.mkdirs();
FileOutputStream f = new FileOutputStream(fileName);
DataOutputStream out = new DataOutputStream(new BufferedOutputStream(f));
out.writeInt(magicHeader());
out.writeChar(minorVersion());
out.writeChar(majorVersion());
cp.emit(out);
int flags = flags();
if (isNestedType()) flags = mangledFlags(flags);
if (isInterfaceDecl()) flags |= Modifiers.ACC_INTERFACE;
out.writeChar(flags);
out.writeChar(cp.addClass(constantPoolName()));
out.writeChar(cp.addClass("java/lang/Object"));
if (getNumSuperInterfaceId() == 1 && getSuperInterfaceId(0).type().isObject())
out.writeChar(0);
else out.writeChar(getNumSuperInterfaceId());
for (int i = 0; i < getNumSuperInterfaceId(); i++) {
TypeDecl typeDecl = getSuperInterfaceId(i).type();
if (typeDecl.isInterfaceDecl()) out.writeChar(cp.addClass(typeDecl.constantPoolName()));
}
Collection fields = bcFields();
out.writeChar(fields.size());
for (Iterator iter = fields.iterator(); iter.hasNext(); ) {
FieldDeclaration field = (FieldDeclaration) iter.next();
out.writeChar(field.flags());
out.writeChar(cp.addUtf8(field.name()));
out.writeChar(cp.addUtf8(field.type().typeDescriptor()));
out.writeChar(field.attributes().size());
for (Iterator itera = field.attributes().iterator(); itera.hasNext(); )
((Attribute) itera.next()).emit(out);
}
Collection methods = bcMethods();
out.writeChar(methods.size() + (hasClinit() ? 1 : 0));
for (Iterator iter = methods.iterator(); iter.hasNext(); ) {
BodyDecl b = (BodyDecl) iter.next();
b.generateMethod(out, cp);
}
if (hasClinit()) {
out.writeChar(Modifiers.ACC_STATIC);
out.writeChar(cp.addUtf8("<clinit>"));
out.writeChar(cp.addUtf8("()V"));
out.writeChar(clinit_attributes().size());
for (Iterator itera = clinit_attributes().iterator(); itera.hasNext(); )
((Attribute) itera.next()).emit(out);
}
out.writeChar(attributes().size());
for (Iterator itera = attributes().iterator(); itera.hasNext(); )
((Attribute) itera.next()).emit(out);
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}