1 package org.ibex.classgen;
6 /** Class generation object representing the whole classfile */
7 public class ClassFile implements CGConst {
8 private final Type.Class thisType;
9 private final Type.Class superType;
10 private final Type.Class[] interfaces;
15 private String sourceFile;
16 private final Vector fields = new Vector();
17 private final Vector methods = new Vector();
20 private final AttrGen attributes;
22 public static String flagsToString(int flags) {
24 if ((flags & ACC_PUBLIC) != 0) ret += "public ";
25 if ((flags & ACC_PRIVATE) != 0) ret += "private ";
26 if ((flags & ACC_PROTECTED) != 0) ret += "protected ";
27 if ((flags & ACC_STATIC) != 0) ret += "static ";
28 if ((flags & ACC_FINAL) != 0) ret += "final ";
29 if ((flags & ACC_ABSTRACT) != 0) ret += "abstract ";
30 if ((flags & ACC_SYNCHRONIZED) != 0) ret += "synchronized ";
31 if ((flags & ACC_NATIVE) != 0) ret += "native ";
32 if ((flags & ACC_STRICT) != 0) ret += "strictfp ";
33 if ((flags & ACC_VOLATILE) != 0) ret += "volatile ";
34 if ((flags & ACC_TRANSIENT) != 0) ret += "transient ";
38 public Type.Class getType() { return thisType; }
39 public String toString() { StringBuffer sb = new StringBuffer(); toString(sb); return sb.toString(); }
40 public void toString(StringBuffer sb) {
41 sb.append(flagsToString(flags));
42 sb.append((flags & ACC_INTERFACE) != 0 ? "interface " : "class ");
44 if (superType != null) sb.append(" extends " + superType);
45 if (interfaces != null && interfaces.length > 0) sb.append(" implements");
46 for(int i=0; i<interfaces.length; i++) sb.append((i==0?" ":", ")+interfaces[i]);
48 sb.append(" // [jcf v"+major+"."+minor+"]");
49 if (sourceFile != null) sb.append(" from " + sourceFile);
51 for(int i=0; i<fields.size(); i++) {
53 ((FieldGen)fields.elementAt(i)).toString(sb);
56 for(int i=0; i<methods.size(); i++) {
58 ((MethodGen)methods.elementAt(i)).toString(sb, thisType.getShortName());
64 /** @see #ClassFile(Type.Class, Type.Class, int) */
65 public ClassFile(String name, String superName, int flags) {
66 this(Type.instance(name).asClass(), Type.instance(superName).asClass(), flags);
69 /** @see #ClassFile(Type.Class, Type.Class, int, Type.Class[]) */
70 public ClassFile(Type.Class thisType, Type.Class superType, int flags) {
71 this(thisType, superType, flags, null);
74 /** Creates a new ClassFile object
75 @param thisType The type of the class to generate
76 @param superType The superclass of the generated class (commonly Type.OBJECT)
77 @param flags The access flags for this class (ACC_PUBLIC, ACC_FINAL, ACC_SUPER, ACC_INTERFACE, and ACC_ABSTRACT)
79 public ClassFile(Type.Class thisType, Type.Class superType, int flags, Type.Class[] interfaces) {
80 if((flags & ~(ACC_PUBLIC|ACC_FINAL|ACC_SUPER|ACC_INTERFACE|ACC_ABSTRACT)) != 0)
81 throw new IllegalArgumentException("invalid flags");
82 this.thisType = thisType;
83 this.superType = superType;
84 this.interfaces = interfaces;
90 attributes = new AttrGen(cp);
93 /** Adds a new method to this class
94 @param name The name of the method (not the signature, just the name)
95 @param ret The return type of the method
96 @param args The arguments to the method
97 @param flags The flags for the method
98 (ACC_PUBLIC, ACC_PRIVATE, ACC_PROTECTED, ACC_STATIC, ACC_SYNCHRONIZED, ACC_NATIVE, ACC_ABSTRACT, ACC_STRICT)
99 @return A new MethodGen object for the method
100 @exception IllegalArgumentException if illegal flags are specified
104 public final MethodGen addMethod(String name, Type ret, Type[] args, int flags) {
105 MethodGen mg = new MethodGen(this, name, ret, args, flags);
106 methods.addElement(mg);
110 /** Adds a new field to this class
111 @param name The name of the filed (not the signature, just the name)
112 @param type The type of the field
113 @param flags The flags for the field
114 (ACC_PUBLIC, ACC_PRIVATE, ACC_PROTECTED, ACC_STATIC, ACC_FINAL, ACC_VOLATILE, ACC_TRANSIENT)
115 @return A new FieldGen object for the method
116 @exception IllegalArgumentException if illegal flags are specified
120 public final FieldGen addField(String name, Type type, int flags) {
121 FieldGen fg = new FieldGen(this, name, type, flags);
122 fields.addElement(fg);
126 /** Sets the source value of the SourceFile attribute of this class
127 @param sourceFile The string to be uses as the SourceFile of this class
129 public void setSourceFile(String sourceFile) { this.sourceFile = sourceFile; }
131 /** Writes the classfile data to the file specifed
132 @see ClassFile#dump(OutputStream)
134 public void dump(String file) throws IOException { dump(new File(file)); }
136 /** Writes the classfile data to the file specified
137 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)
138 @see ClassFile#dump(OutputStream)
140 public void dump(File f) throws IOException {
141 if(f.isDirectory()) {
142 String[] a = thisType.components();
144 for(i=0;i<a.length-1;i++) {
145 f = new File(f, a[i]);
148 f = new File(f, a[i] + ".class");
150 OutputStream os = new FileOutputStream(f);
155 /** Writes the classfile data to the outputstream specified
156 @param os The stream to write the class to
157 @exception IOException if an IOException occures while writing the class data
158 @exception IllegalStateException if the data for a method is in an inconsistent state (required arguments missing, etc)
159 @exception Exn if the classfile could not be written for any other reason (constant pool full, etc)
161 public void dump(OutputStream os) throws IOException {
162 DataOutputStream dos = new DataOutputStream(new BufferedOutputStream(os));
167 private void _dump(DataOutput o) throws IOException {
173 if(interfaces != null) for(int i=0;i<interfaces.length;i++) cp.add(interfaces[i]);
174 if(sourceFile != null && !attributes.contains("SourceFile")) attributes.add("SourceFile", cp.addUtf8(sourceFile));
176 for(int i=0;i<methods.size();i++) ((MethodGen)methods.elementAt(i)).finish();
177 for(int i=0;i<fields.size();i++) ((FieldGen)fields.elementAt(i)).finish();
181 o.writeInt(0xcafebabe); // magic
182 o.writeShort(minor); // minor_version
183 o.writeShort(major); // major_version
185 cp.dump(o); // constant_pool
188 o.writeShort(cp.getIndex(thisType)); // this_class
189 o.writeShort(cp.getIndex(superType)); // super_class
191 o.writeShort(interfaces==null ? 0 : interfaces.length); // interfaces_count
192 if(interfaces != null) for(int i=0;i<interfaces.length;i++) o.writeShort(cp.getIndex(interfaces[i])); // interfaces
194 o.writeShort(fields.size()); // fields_count
195 for(int i=0;i<fields.size();i++) ((FieldGen)fields.elementAt(i)).dump(o); // fields
197 o.writeShort(methods.size()); // methods_count
198 for(int i=0;i<methods.size();i++) ((MethodGen)methods.elementAt(i)).dump(o); // methods
200 o.writeShort(attributes.size()); // attributes_count
201 attributes.dump(o); // attributes
204 public ClassFile read(File f) throws ClassReadExn, IOException {
205 InputStream is = new FileInputStream(f);
206 ClassFile ret = read(is);
211 public ClassFile read(InputStream is) throws ClassReadExn, IOException {
212 return new ClassFile(new DataInputStream(new BufferedInputStream(is)));
215 ClassFile(DataInput i) throws ClassReadExn, IOException {
216 int magic = i.readInt();
217 if (magic != 0xcafebabe) throw new ClassReadExn("invalid magic: " + Long.toString(0xffffffffL & magic, 16));
218 minor = i.readShort();
219 //if (minor != 3) throw new ClassReadExn("invalid minor version: " + minor);
220 major = i.readShort();
221 //if (major != 45 && major != 46) throw new ClassReadExn("invalid major version");
223 flags = i.readShort();
224 thisType = (Type.Class)cp.getType(i.readShort());
225 superType = (Type.Class)cp.getType(i.readShort());
226 interfaces = new Type.Class[i.readShort()];
227 for(int j=0; j<interfaces.length; j++) interfaces[j] = (Type.Class)cp.getType(i.readShort());
228 int numFields = i.readShort();
229 for(int j=0; j<numFields; j++) fields.add(new FieldGen(cp, i));
230 int numMethods = i.readShort();
231 for(int j=0; j<numMethods; j++) methods.add(new MethodGen(cp, i, this));
232 attributes = new AttrGen(cp, i);
233 sourceFile = (String)attributes.get("SourceFile");
236 /** Thrown when class generation fails for a reason not under the control of the user
237 (IllegalStateExceptions are thrown in those cases */
238 public static class Exn extends RuntimeException {
239 public Exn(String s) { super(s); }
242 public static class ClassReadExn extends IOException {
243 public ClassReadExn(String s) { super(s); }
246 static class AttrGen {
247 private final CPGen cp;
248 private final Hashtable ht = new Hashtable();
250 public AttrGen(CPGen cp) { this.cp = cp; }
251 public AttrGen(CPGen cp, DataInput in) throws IOException {
253 int size = in.readShort();
254 for(int i=0; i<size; i++) {
256 int idx = in.readShort();
257 CPGen.Ent e = cp.getByIndex(idx);
258 Object key = e.key();
259 if (key instanceof String) name = (String)key;
260 else name = ((Type)key).getDescriptor();
262 int length = in.readInt();
263 if (length==2) { // FIXME might be wrong assumption
264 ht.put(name, cp.getByIndex(in.readShort()));
266 byte[] buf = new byte[length];
273 public Object get(String s) {
274 Object ret = ht.get(s);
275 if (ret instanceof CPGen.Utf8Ent) return ((CPGen.Utf8Ent)ret).s;
279 public void add(String s, Object data) {
284 public boolean contains(String s) { return ht.get(s) != null; }
286 public int size() { return ht.size(); }
288 public void dump(DataOutput o) throws IOException {
289 for(Enumeration e = ht.keys(); e.hasMoreElements();) {
290 String name = (String) e.nextElement();
291 Object val = ht.get(name);
292 o.writeShort(cp.getUtf8Index(name));
293 if(val instanceof byte[]) {
294 byte[] buf = (byte[]) val;
295 o.writeInt(buf.length);
297 } else if(val instanceof CPGen.Ent) {
299 o.writeShort(cp.getIndex((CPGen.Ent)val));
301 throw new Error("should never happen");
307 public static void main(String[] args) throws Exception {
308 if (args.length==1) {
309 if (args[0].endsWith(".class")) {
310 System.out.println(new ClassFile(new DataInputStream(new FileInputStream(args[0]))));
312 InputStream is = Class.forName(args[0]).getClassLoader().getResourceAsStream(args[0].replace('.', '/')+".class");
313 System.out.println(new ClassFile(new DataInputStream(is)));
317 Type.Class me = new Type.Class("Test");
318 ClassFile cg = new ClassFile("Test", "java.lang.Object", ACC_PUBLIC|ACC_SUPER|ACC_FINAL);
319 FieldGen fg = cg.addField("foo", Type.INT, ACC_PUBLIC|ACC_STATIC);
321 MethodGen mg = cg.addMethod("main", Type.VOID, new Type[]{Type.arrayType(Type.STRING)}, ACC_STATIC|ACC_PUBLIC);
325 mg.add(PUTSTATIC, fieldRef(me, "foo", Type.INT));
327 mg.add(GETSTATIC, cg.fieldRef(new Type.Class("java.lang.System"), "out", new Type.Class("java.io.PrintStream")));
329 mg.add(GETSTATIC, cg.fieldRef(me, "foo", Type.INT));
330 mg.add(INVOKEVIRTUAL, cg.methodRef(new Type.Class("java.io.PrintStream"), "println",
331 Type.VOID, new Type[]{Type.INT}));
332 //mg.add(IINC, new int[]{0, 1});
334 mg.add(GETSTATIC, cg.fieldRef(me, "foo", Type.INT));
338 mg.add(PUTSTATIC, cg.fieldRef(me, "foo", Type.INT));
340 mg.add(IF_ICMPLT, top);
342 cg.dump("Test.class");