import java.util.*;
import java.io.*;
+/** Class generation object representing the whole classfile */
public class ClassGen implements CGConst {
- private Type.Object thisType;
- private Type.Object superType;
- int flags;
+ private final Type.Object thisType;
+ private final Type.Object superType;
+ private final Type.Object[] interfaces;
+ private short minor;
+ private short major;
+ final int flags;
- private Vector interfaces = new Vector();
- private Vector fields = new Vector();
- private Vector methods = new Vector();
+ private String sourceFile;
+ private final Vector fields = new Vector();
+ private final Vector methods = new Vector();
final CPGen cp;
private final AttrGen attributes;
-
+
+ public static String flagsToString(int flags) {
+ String ret = "";
+ if ((flags & ACC_PUBLIC) != 0) ret += "public ";
+ if ((flags & ACC_PRIVATE) != 0) ret += "private ";
+ if ((flags & ACC_PROTECTED) != 0) ret += "protected ";
+ if ((flags & ACC_STATIC) != 0) ret += "static ";
+ if ((flags & ACC_FINAL) != 0) ret += "final ";
+ if ((flags & ACC_ABSTRACT) != 0) ret += "abstract ";
+ if ((flags & ACC_SYNCHRONIZED) != 0) ret += "synchronized ";
+ if ((flags & ACC_NATIVE) != 0) ret += "native ";
+ if ((flags & ACC_STRICT) != 0) ret += "strictfp ";
+ if ((flags & ACC_VOLATILE) != 0) ret += "volatile ";
+ if ((flags & ACC_TRANSIENT) != 0) ret += "transient ";
+ return ret;
+ }
+
+ public String toString() { StringBuffer sb = new StringBuffer(); toString(sb); return sb.toString(); }
+ public void toString(StringBuffer sb) {
+ sb.append(flagsToString(flags));
+ sb.append((flags & ACC_INTERFACE) != 0 ? "interface " : "class ");
+ sb.append(thisType.humanReadable());
+ if (superType != null) sb.append(" extends " + superType.humanReadable());
+ if (interfaces != null && interfaces.length > 0) sb.append(" implements");
+ for(int i=0; i<interfaces.length; i++) sb.append((i==0?" ":", ")+interfaces[i].humanReadable());
+ sb.append(" {");
+ sb.append(" // [jcf v"+major+"."+minor+"]");
+ if (sourceFile != null) sb.append(" from " + sourceFile);
+ sb.append("\n");
+ for(int i=0; i<fields.size(); i++) {
+ sb.append(" ");
+ ((FieldGen)fields.elementAt(i)).toString(sb);
+ sb.append("\n");
+ }
+ for(int i=0; i<methods.size(); i++) {
+ sb.append(" ");
+ ((MethodGen)methods.elementAt(i)).toString(sb, thisType.getShortName());
+ sb.append("\n");
+ }
+ sb.append("}");
+ }
+
+ /** @see #ClassGen(Type.Object, Type.Object, int) */
public ClassGen(String name, String superName, int flags) {
- this(new Type.Object(name),new Type.Object(superName),flags);
+ this(Type.fromDescriptor(name).asObject(), Type.fromDescriptor(superName).asObject(), flags);
+ }
+
+ /** @see #ClassGen(Type.Object, Type.Object, int, Type.Object[]) */
+ public ClassGen(Type.Object thisType, Type.Object superType, int flags) {
+ this(thisType, superType, flags, null);
}
- public ClassGen(Type.Object thisType,Type.Object superType, int flags) {
+ /** Creates a new ClassGen object
+ @param thisType The type of the class to generate
+ @param superType The superclass of the generated class (commonly Type.OBJECT)
+ @param flags The access flags for this class (ACC_PUBLIC, ACC_FINAL, ACC_SUPER, ACC_INTERFACE, and ACC_ABSTRACT)
+ */
+ public ClassGen(Type.Object thisType, Type.Object superType, int flags, Type.Object[] interfaces) {
if((flags & ~(ACC_PUBLIC|ACC_FINAL|ACC_SUPER|ACC_INTERFACE|ACC_ABSTRACT)) != 0)
throw new IllegalArgumentException("invalid flags");
this.thisType = thisType;
this.superType = superType;
+ this.interfaces = interfaces;
this.flags = flags;
+ this.minor = 3;
+ this.major = 45;
cp = new CPGen();
attributes = new AttrGen(cp);
}
+ /** Adds a new method to this class
+ @param name The name of the method (not the signature, just the name)
+ @param ret The return type of the method
+ @param args The arguments to the method
+ @param flags The flags for the method
+ (ACC_PUBLIC, ACC_PRIVATE, ACC_PROTECTED, ACC_STATIC, ACC_SYNCHRONIZED, ACC_NATIVE, ACC_ABSTRACT, ACC_STRICT)
+ @return A new MethodGen object for the method
+ @exception IllegalArgumentException if illegal flags are specified
+ @see MethodGen
+ @see CGConst
+ */
public final MethodGen addMethod(String name, Type ret, Type[] args, int flags) {
- MethodGen mg = new MethodGen(this,name,ret,args,flags);
+ MethodGen mg = new MethodGen(this, name, ret, args, flags);
methods.addElement(mg);
return mg;
}
+ /** Adds a new field to this class
+ @param name The name of the filed (not the signature, just the name)
+ @param type The type of the field
+ @param flags The flags for the field
+ (ACC_PUBLIC, ACC_PRIVATE, ACC_PROTECTED, ACC_STATIC, ACC_FINAL, ACC_VOLATILE, ACC_TRANSIENT)
+ @return A new FieldGen object for the method
+ @exception IllegalArgumentException if illegal flags are specified
+ @see FieldGen
+ @see CGConst
+ */
public final FieldGen addField(String name, Type type, int flags) {
- FieldGen fg = new FieldGen(this,name,type,flags);
+ FieldGen fg = new FieldGen(this, name, type, flags);
fields.addElement(fg);
return fg;
}
- public void dump(String s) throws IOException { dump(new File(s)); }
+ /** Sets the source value of the SourceFile attribute of this class
+ @param sourceFile The string to be uses as the SourceFile of this class
+ */
+ public void setSourceFile(String sourceFile) { this.sourceFile = sourceFile; }
+
+ /** Writes the classfile data to the file specifed
+ @see ClassGen#dump(OutputStream)
+ */
+ public void dump(String file) throws IOException { dump(new File(file)); }
+
+ /** Writes the classfile data to the file specified
+ If <i>f</i> is a directory directory components under it are created for the package the class is in (like javac's -d option)
+ @see ClassGen#dump(OutputStream)
+ */
public void dump(File f) throws IOException {
if(f.isDirectory()) {
String[] a = thisType.components();
int i;
for(i=0;i<a.length-1;i++) {
- f = new File(f,a[i]);
+ f = new File(f, a[i]);
f.mkdir();
}
- f = new File(f,a[i] + ".class");
+ f = new File(f, a[i] + ".class");
}
- dump(new FileOutputStream(f));
+ OutputStream os = new FileOutputStream(f);
+ dump(os);
+ os.close();
}
+
+ /** Writes the classfile data to the outputstream specified
+ @param os The stream to write the class to
+ @exception IOException if an IOException occures while writing the class data
+ @exception IllegalStateException if the data for a method is in an inconsistent state (required arguments missing, etc)
+ @exception Exn if the classfile could not be written for any other reason (constant pool full, etc)
+ */
public void dump(OutputStream os) throws IOException {
DataOutputStream dos = new DataOutputStream(new BufferedOutputStream(os));
_dump(dos);
}
private void _dump(DataOutput o) throws IOException {
+ cp.optimize();
+ cp.stable();
+
cp.add(thisType);
cp.add(superType);
- for(int i=0;i<interfaces.size();i++) cp.add((Type.Object)interfaces.elementAt(i));
+ if(interfaces != null) for(int i=0;i<interfaces.length;i++) cp.add(interfaces[i]);
+ if(sourceFile != null && !attributes.contains("SourceFile")) attributes.add("SourceFile", cp.addUtf8(sourceFile));
+
for(int i=0;i<methods.size();i++) ((MethodGen)methods.elementAt(i)).finish();
+ for(int i=0;i<fields.size();i++) ((FieldGen)fields.elementAt(i)).finish();
+
cp.seal();
o.writeInt(0xcafebabe); // magic
- // FIXME: What should this be for JDK 1.1 ?
- o.writeShort(0); // minor_version
- o.writeShort(46); // major_version
+ o.writeShort(minor); // minor_version
+ o.writeShort(major); // major_version
- o.writeShort(cp.size()); // constant_pool_count
cp.dump(o); // constant_pool
o.writeShort(flags);
o.writeShort(cp.getIndex(thisType)); // this_class
o.writeShort(cp.getIndex(superType)); // super_class
- o.writeShort(interfaces.size()); // interfaces_count
- for(int i=0;i<interfaces.size();i++) o.writeShort(cp.getIndex(interfaces.elementAt(i))); // interfaces
+ o.writeShort(interfaces==null ? 0 : interfaces.length); // interfaces_count
+ if(interfaces != null) for(int i=0;i<interfaces.length;i++) o.writeShort(cp.getIndex(interfaces[i])); // interfaces
o.writeShort(fields.size()); // fields_count
for(int i=0;i<fields.size();i++) ((FieldGen)fields.elementAt(i)).dump(o); // fields
attributes.dump(o); // attributes
}
- // FEATURE: Make some of these checked exceptions?
- public static class Exn extends RuntimeException {
- public Exn(String s) { super(s); }
+ public ClassGen read(File f) throws ClassReadExn, IOException {
+ InputStream is = new FileInputStream(f);
+ ClassGen ret = read(is);
+ is.close();
+ return ret;
+ }
+
+ public ClassGen read(InputStream is) throws ClassReadExn, IOException {
+ return new ClassGen(new DataInputStream(new BufferedInputStream(is)));
}
- // FEATURE: Remove these - they are just here to be compatible with the old api
- public final static MethodRef methodRef(Type.Object c, String name, Type ret, Type[] args) {
- return new MethodRef(c,name,ret,args);
+ ClassGen(DataInput i) throws ClassReadExn, IOException {
+ int magic = i.readInt();
+ if (magic != 0xcafebabe) throw new ClassReadExn("invalid magic: " + Long.toString(0xffffffffL & magic, 16));
+ minor = i.readShort();
+ //if (minor != 3) throw new ClassReadExn("invalid minor version: " + minor);
+ major = i.readShort();
+ //if (major != 45 && major != 46) throw new ClassReadExn("invalid major version");
+ cp = new CPGen(i);
+ flags = i.readShort();
+ thisType = (Type.Object)cp.getType(i.readShort());
+ superType = (Type.Object)cp.getType(i.readShort());
+ interfaces = new Type.Object[i.readShort()];
+ for(int j=0; j<interfaces.length; j++) interfaces[j] = (Type.Object)cp.getType(i.readShort());
+ int numFields = i.readShort();
+ for(int j=0; j<numFields; j++) fields.add(new FieldGen(cp, i));
+ int numMethods = i.readShort();
+ for(int j=0; j<numMethods; j++) methods.add(new MethodGen(cp, i));
+ attributes = new AttrGen(cp, i);
+ sourceFile = (String)attributes.get("SourceFile");
}
- public final static FieldRef fieldRef(Type.Object c, String name, Type type) {
- return new FieldRef(c,name,type);
+
+ /** Thrown when class generation fails for a reason not under the control of the user
+ (IllegalStateExceptions are thrown in those cases */
+ public static class Exn extends RuntimeException {
+ public Exn(String s) { super(s); }
}
- public static class NameAndType {
- String name;
- String type;
- NameAndType(String name, String type) { this.name = name; this.type = type; }
- public boolean equals(Object o_) {
- if(!(o_ instanceof NameAndType)) return false;
- NameAndType o = (NameAndType) o_;
- return o.name.equals(name) && o.type.equals(type);
- }
- public int hashCode() { return name.hashCode() ^ type.hashCode(); }
+ public static class ClassReadExn extends IOException {
+ public ClassReadExn(String s) { super(s); }
}
- public static abstract class FieldMethodRef {
+ /** A class representing a field or method reference. This is used as an argument to the INVOKE*, GET*, and PUT* bytecodes
+ @see MethodRef
+ @see FieldRef
+ @see MethodRef.I
+ @see FieldRef
+ */
+ public static abstract class FieldOrMethodRef {
Type.Object klass;
- NameAndType nameAndType;
- FieldMethodRef(Type.Object klass, NameAndType nameAndType) { this.klass = klass; this.nameAndType = nameAndType; }
+ String name;
+ String descriptor;
+
+ FieldOrMethodRef(Type.Object klass, String name, String descriptor) { this.klass = klass; this.name = name; this.descriptor = descriptor; }
+ FieldOrMethodRef(FieldOrMethodRef o) { this.klass = o.klass; this.name = o.name; this.descriptor = o.descriptor; }
public boolean equals(Object o_) {
- if(!(o_ instanceof FieldMethodRef)) return false;
- FieldMethodRef o = (FieldMethodRef) o_;
- return o.klass.equals(klass) && o.nameAndType.equals(nameAndType);
+ if(!(o_ instanceof FieldOrMethodRef)) return false;
+ FieldOrMethodRef o = (FieldOrMethodRef) o_;
+ return o.klass.equals(klass) && o.name.equals(name) && o.descriptor.equals(descriptor);
}
- public int hashCode() { return klass.hashCode() ^ nameAndType.hashCode(); }
+ public int hashCode() { return klass.hashCode() ^ name.hashCode() ^ descriptor.hashCode(); }
}
- public static class InterfaceMethodRef extends FieldMethodRef {
- public InterfaceMethodRef(MethodRef r) { super(r.klass,r.nameAndType); }
- public InterfaceMethodRef(Type.Object c, NameAndType t) { super(c,t); }
+ static class AttrGen {
+ private final CPGen cp;
+ private final Hashtable ht = new Hashtable();
+
+ public AttrGen(CPGen cp) { this.cp = cp; }
+ public AttrGen(CPGen cp, DataInput in) throws IOException {
+ this(cp);
+ int size = in.readShort();
+ for(int i=0; i<size; i++) {
+ String name = null;
+ int idx = in.readShort();
+ CPGen.Ent e = cp.getByIndex(idx);
+ Object key = e.key();
+ if (key instanceof String) name = (String)key;
+ else name = ((Type)key).getDescriptor();
+
+ int length = in.readInt();
+ if (length==2) { // FIXME might be wrong assumption
+ ht.put(name, cp.getByIndex(in.readShort()));
+ } else {
+ byte[] buf = new byte[length];
+ in.readFully(buf);
+ ht.put(name, buf);
+ }
+ }
+ }
+
+ public Object get(String s) {
+ Object ret = ht.get(s);
+ if (ret instanceof CPGen.Utf8Ent) return ((CPGen.Utf8Ent)ret).s;
+ return ret;
+ }
+
+ public void add(String s, Object data) {
+ cp.addUtf8(s);
+ ht.put(s, data);
+ }
+
+ public boolean contains(String s) { return ht.get(s) != null; }
+
+ public int size() { return ht.size(); }
+
+ public void dump(DataOutput o) throws IOException {
+ for(Enumeration e = ht.keys(); e.hasMoreElements();) {
+ String name = (String) e.nextElement();
+ Object val = ht.get(name);
+ o.writeShort(cp.getUtf8Index(name));
+ if(val instanceof byte[]) {
+ byte[] buf = (byte[]) val;
+ o.writeInt(buf.length);
+ o.write(buf);
+ } else if(val instanceof CPGen.Ent) {
+ o.writeInt(2);
+ o.writeShort(cp.getIndex((CPGen.Ent)val));
+ } else {
+ throw new Error("should never happen");
+ }
+ }
+ }
}
public static void main(String[] args) throws Exception {
- Type.Object me = new Type.Object("Test");
- ClassGen cg = new ClassGen("Test","java.lang.Object",ACC_PUBLIC|ACC_SUPER|ACC_FINAL);
- FieldGen fg = cg.addField("foo",Type.INT,ACC_PUBLIC|ACC_STATIC);
-
- MethodGen mg = cg.addMethod("main",Type.VOID,new Type[]{Type.arrayType(Type.STRING)},ACC_STATIC|ACC_PUBLIC);
- mg.setMaxLocals(1);
- mg.addPushConst(0);
- //mg.add(ISTORE_0);
- mg.add(PUTSTATIC,cg.fieldRef(me,"foo",Type.INT));
- int top = mg.size();
- mg.add(GETSTATIC,cg.fieldRef(new Type.Object("java.lang.System"),"out",new Type.Object("java.io.PrintStream")));
- //mg.add(ILOAD_0);
- mg.add(GETSTATIC,cg.fieldRef(me,"foo",Type.INT));
- mg.add(INVOKEVIRTUAL,cg.methodRef(new Type.Object("java.io.PrintStream"),"println",Type.VOID, new Type[]{Type.INT}));
- //mg.add(IINC,new int[]{0,1});
- //mg.add(ILOAD_0);
- mg.add(GETSTATIC,cg.fieldRef(me,"foo",Type.INT));
- mg.addPushConst(1);
- mg.add(IADD);
- mg.add(DUP);
- mg.add(PUTSTATIC,cg.fieldRef(me,"foo",Type.INT));
- mg.addPushConst(10);
- mg.add(IF_ICMPLT,top);
- mg.add(RETURN);
- cg.dump("Test.class");
+ if (args.length==1) {
+ if (args[0].endsWith(".class")) {
+ System.out.println(new ClassGen(new DataInputStream(new FileInputStream(args[0]))));
+ } else {
+ InputStream is = Class.forName(args[0]).getClassLoader().getResourceAsStream(args[0].replace('.', '/')+".class");
+ System.out.println(new ClassGen(new DataInputStream(is)));
+ }
+ } else {
+ /*
+ Type.Object me = new Type.Object("Test");
+ ClassGen cg = new ClassGen("Test", "java.lang.Object", ACC_PUBLIC|ACC_SUPER|ACC_FINAL);
+ FieldGen fg = cg.addField("foo", Type.INT, ACC_PUBLIC|ACC_STATIC);
+
+ MethodGen mg = cg.addMethod("main", Type.VOID, new Type[]{Type.arrayType(Type.STRING)}, ACC_STATIC|ACC_PUBLIC);
+ mg.setMaxLocals(1);
+ mg.addPushConst(0);
+ //mg.add(ISTORE_0);
+ mg.add(PUTSTATIC, fieldRef(me, "foo", Type.INT));
+ int top = mg.size();
+ mg.add(GETSTATIC, cg.fieldRef(new Type.Object("java.lang.System"), "out", new Type.Object("java.io.PrintStream")));
+ //mg.add(ILOAD_0);
+ mg.add(GETSTATIC, cg.fieldRef(me, "foo", Type.INT));
+ mg.add(INVOKEVIRTUAL, cg.methodRef(new Type.Object("java.io.PrintStream"), "println",
+ Type.VOID, new Type[]{Type.INT}));
+ //mg.add(IINC, new int[]{0, 1});
+ //mg.add(ILOAD_0);
+ mg.add(GETSTATIC, cg.fieldRef(me, "foo", Type.INT));
+ mg.addPushConst(1);
+ mg.add(IADD);
+ mg.add(DUP);
+ mg.add(PUTSTATIC, cg.fieldRef(me, "foo", Type.INT));
+ mg.addPushConst(10);
+ mg.add(IF_ICMPLT, top);
+ mg.add(RETURN);
+ cg.dump("Test.class");
+ */
+ }
}
}
projects / org.ibex.classgen.git / blobdiff