Examples of jdk.internal.org.objectweb.asm.ClassWriter

         *
         * @param types the type signature, wherein reference types are erased to 'L'
         * @return the generated concrete BMH class
         */
        static Class<? extends BoundMethodHandle> generateConcreteBMHClass(String types) {
            final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES);


            final String className  = SPECIES_PREFIX_PATH + types;
            final String sourceFile = SPECIES_PREFIX_NAME + types;
            final int NOT_ACC_PUBLIC = 0;  // not ACC_PUBLIC
            cw.visit(V1_6, NOT_ACC_PUBLIC + ACC_FINAL + ACC_SUPER, className, null, BMH, null);
            cw.visitSource(sourceFile, null);


            // emit static types and SPECIES_DATA fields
            cw.visitField(NOT_ACC_PUBLIC + ACC_STATIC, "SPECIES_DATA", SPECIES_DATA_SIG, null, null).visitEnd();


            // emit bound argument fields
            for (int i = 0; i < types.length(); ++i) {
                final char t = types.charAt(i);
                final String fieldName = makeFieldName(types, i);
                final String fieldDesc = t == 'L' ? JLO_SIG : String.valueOf(t);
                cw.visitField(ACC_FINAL, fieldName, fieldDesc, null, null).visitEnd();
            }


            MethodVisitor mv;


            // emit constructor
            mv = cw.visitMethod(NOT_ACC_PUBLIC, "<init>", makeSignature(types, true), null, null);
            mv.visitCode();
            mv.visitVarInsn(ALOAD, 0);
            mv.visitVarInsn(ALOAD, 1);
            mv.visitVarInsn(ALOAD, 2);


            mv.visitMethodInsn(INVOKESPECIAL, BMH, "<init>", makeSignature("", true));


            for (int i = 0, j = 0; i < types.length(); ++i, ++j) {
                // i counts the arguments, j counts corresponding argument slots
                char t = types.charAt(i);
                mv.visitVarInsn(ALOAD, 0);
                mv.visitVarInsn(typeLoadOp(t), j + 3); // parameters start at 3
                mv.visitFieldInsn(PUTFIELD, className, makeFieldName(types, i), typeSig(t));
                if (t == 'J' || t == 'D') {
                    ++j; // adjust argument register access
                }
            }


            mv.visitInsn(RETURN);
            mv.visitMaxs(0, 0);
            mv.visitEnd();


            // emit implementation of reinvokerTarget()
            mv = cw.visitMethod(NOT_ACC_PUBLIC + ACC_FINAL, "reinvokerTarget", "()" + MH_SIG, null, null);
            mv.visitCode();
            mv.visitVarInsn(ALOAD, 0);
            mv.visitFieldInsn(GETFIELD, className, "argL0", JLO_SIG);
            mv.visitTypeInsn(CHECKCAST, MH);
            mv.visitInsn(ARETURN);
            mv.visitMaxs(0, 0);
            mv.visitEnd();


            // emit implementation of speciesData()
            mv = cw.visitMethod(NOT_ACC_PUBLIC + ACC_FINAL, "speciesData", MYSPECIES_DATA_SIG, null, null);
            mv.visitCode();
            mv.visitFieldInsn(GETSTATIC, className, "SPECIES_DATA", SPECIES_DATA_SIG);
            mv.visitInsn(ARETURN);
            mv.visitMaxs(0, 0);
            mv.visitEnd();


            // emit clone()
            mv = cw.visitMethod(NOT_ACC_PUBLIC + ACC_FINAL, "clone", makeSignature("", false), null, E_THROWABLE);
            mv.visitCode();
            // return speciesData().constructor[0].invokeBasic(mt, lf, argL0, ...)
            // obtain constructor
            mv.visitVarInsn(ALOAD, 0);
            mv.visitFieldInsn(GETSTATIC, className, "SPECIES_DATA", SPECIES_DATA_SIG);
            mv.visitFieldInsn(GETFIELD, SPECIES_DATA, "constructor", "[" + MH_SIG);
            mv.visitInsn(ICONST_0);
            mv.visitInsn(AALOAD);
            // load mt, lf
            mv.visitVarInsn(ALOAD, 1);
            mv.visitVarInsn(ALOAD, 2);
            // put fields on the stack
            emitPushFields(types, className, mv);
            // finally, invoke the constructor and return
            mv.visitMethodInsn(INVOKEVIRTUAL, MH, "invokeBasic", makeSignature(types, false));
            mv.visitInsn(ARETURN);
            mv.visitMaxs(0, 0);
            mv.visitEnd();


            // for each type, emit cloneExtendT()
            for (Class<?> c : TYPES) {
                char t = Wrapper.basicTypeChar(c);
                mv = cw.visitMethod(NOT_ACC_PUBLIC + ACC_FINAL, "cloneExtend" + t, makeSignature(String.valueOf(t), false), null, E_THROWABLE);
                mv.visitCode();
                // return SPECIES_DATA.extendWithIndex(extensionIndex(t)).constructor[0].invokeBasic(mt, lf, argL0, ..., narg)
                // obtain constructor
                mv.visitFieldInsn(GETSTATIC, className, "SPECIES_DATA", SPECIES_DATA_SIG);
                int iconstInsn = ICONST_0 + extensionIndex(t);
                assert(iconstInsn <= ICONST_5);
                mv.visitInsn(iconstInsn);
                mv.visitMethodInsn(INVOKEVIRTUAL, SPECIES_DATA, "extendWithIndex", BMHSPECIES_DATA_EWI_SIG);
                mv.visitFieldInsn(GETFIELD, SPECIES_DATA, "constructor", "[" + MH_SIG);
                mv.visitInsn(ICONST_0);
                mv.visitInsn(AALOAD);
                // load mt, lf
                mv.visitVarInsn(ALOAD, 1);
                mv.visitVarInsn(ALOAD, 2);
                // put fields on the stack
                emitPushFields(types, className, mv);
                // put narg on stack
                mv.visitVarInsn(typeLoadOp(t), 3);
                // finally, invoke the constructor and return
                mv.visitMethodInsn(INVOKEVIRTUAL, MH, "invokeBasic", makeSignature(types + t, false));
                mv.visitInsn(ARETURN);
                mv.visitMaxs(0, 0);
                mv.visitEnd();
            }


            // emit class initializer
            mv = cw.visitMethod(NOT_ACC_PUBLIC | ACC_STATIC, "<clinit>", VOID_SIG, null, null);
            mv.visitCode();
            mv.visitLdcInsn(types);
            mv.visitLdcInsn(Type.getObjectType(className));
            mv.visitMethodInsn(INVOKESTATIC, SPECIES_DATA, "getForClass", BMHSPECIES_DATA_GFC_SIG);
            mv.visitFieldInsn(PUTSTATIC, className, "SPECIES_DATA", SPECIES_DATA_SIG);
            mv.visitInsn(RETURN);
            mv.visitMaxs(0, 0);
            mv.visitEnd();


            cw.visitEnd();


            // load class
            final byte[] classFile = cw.toByteArray();
            InvokerBytecodeGenerator.maybeDump(className, classFile);
            Class<? extends BoundMethodHandle> bmhClass =
                //UNSAFE.defineAnonymousClass(BoundMethodHandle.class, classFile, null).asSubclass(BoundMethodHandle.class);
                UNSAFE.defineClass(className, classFile, 0, classFile.length,
                                   BoundMethodHandle.class.getClassLoader(), null)

                optimize(files[i], d, remapper);
            }
        } else if (f.getName().endsWith(".class")) {
            ConstantPool cp = new ConstantPool();
            ClassReader cr = new ClassReader(new FileInputStream(f));
            ClassWriter cw = new ClassWriter(0);
            ClassConstantsCollector ccc = new ClassConstantsCollector(cw, cp);
            ClassOptimizer co = new ClassOptimizer(ccc, remapper);
            cr.accept(co, ClassReader.SKIP_DEBUG);


            Set<Constant> constants = new TreeSet<Constant>(
                    new ConstantComparator());
            constants.addAll(cp.values());


            cr = new ClassReader(cw.toByteArray());
            cw = new ClassWriter(0);
            Iterator<Constant> i = constants.iterator();
            while (i.hasNext()) {
                Constant c = i.next();
                c.write(cw);
            }
            cr.accept(cw, ClassReader.SKIP_DEBUG);


            if (MAPPING.get(cr.getClassName() + "/remove") != null) {
                return;
            }
            String n = remapper.mapType(cr.getClassName());
            File g = new File(d, n + ".class");
            if (!g.exists() || g.lastModified() < f.lastModified()) {
                if (!g.getParentFile().exists() && !g.getParentFile().mkdirs()) {
                    throw new IOException("Cannot create directory "
                            + g.getParentFile());
                }
                OutputStream os = new FileOutputStream(g);
                try {
                    os.write(cw.toByteArray());
                } finally {
                    os.close();
                }
            }
        }

Examples of jdk.internal.org.objectweb.asm.ClassWriter

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