+++ /dev/null
-package org.ibex.classgen;
-
-import java.util.*;
-import java.io.*;
-
-/** Class generation object representing the whole classfile */
-public class ClassGen implements CGConst {
- private final Type.Class thisType;
- private final Type.Class superType;
- private final Type.Class[] interfaces;
- private short minor;
- private short major;
- final int flags;
-
- 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);
- if (superType != null) sb.append(" extends " + superType);
- if (interfaces != null && interfaces.length > 0) sb.append(" implements");
- for(int i=0; i<interfaces.length; i++) sb.append((i==0?" ":", ")+interfaces[i]);
- 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.Class, Type.Class, int) */
- public ClassGen(String name, String superName, int flags) {
- this(Type.instance(name).asClass(), Type.instance(superName).asClass(), flags);
- }
-
- /** @see #ClassGen(Type.Class, Type.Class, int, Type.Class[]) */
- public ClassGen(Type.Class thisType, Type.Class superType, int flags) {
- this(thisType, superType, flags, null);
- }
-
- /** 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.Class thisType, Type.Class superType, int flags, Type.Class[] 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);
- 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);
- fields.addElement(fg);
- return fg;
- }
-
- /** 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.mkdir();
- }
- f = new File(f, a[i] + ".class");
- }
- 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);
- dos.flush();
- }
-
- private void _dump(DataOutput o) throws IOException {
- cp.optimize();
- cp.stable();
-
- cp.add(thisType);
- cp.add(superType);
- 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
- o.writeShort(minor); // minor_version
- o.writeShort(major); // major_version
-
- 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==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
-
- o.writeShort(methods.size()); // methods_count
- for(int i=0;i<methods.size();i++) ((MethodGen)methods.elementAt(i)).dump(o); // methods
-
- o.writeShort(attributes.size()); // attributes_count
- attributes.dump(o); // attributes
- }
-
- 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)));
- }
-
- 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.Class)cp.getType(i.readShort());
- superType = (Type.Class)cp.getType(i.readShort());
- interfaces = new Type.Class[i.readShort()];
- for(int j=0; j<interfaces.length; j++) interfaces[j] = (Type.Class)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");
- }
-
- /** 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 ClassReadExn extends IOException {
- public ClassReadExn(String s) { super(s); }
- }
-
- /** 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.Class klass;
- String name;
- String descriptor;
-
- FieldOrMethodRef(Type.Class 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 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() ^ name.hashCode() ^ descriptor.hashCode(); }
- }
-
- 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 {
- 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.Class me = new Type.Class("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.Class("java.lang.System"), "out", new Type.Class("java.io.PrintStream")));
- //mg.add(ILOAD_0);
- mg.add(GETSTATIC, cg.fieldRef(me, "foo", Type.INT));
- mg.add(INVOKEVIRTUAL, cg.methodRef(new Type.Class("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