Example usage for org.objectweb.asm MethodVisitor visitLabel

Introduction

In this page you can find the example usage for org.objectweb.asm MethodVisitor visitLabel.

Prototype

public void visitLabel(final Label label) 

Source Link

Document

Visits a label.

Usage

From source file:edu.illinois.nondex.instr.IdentityHashMapShufflingAdder.java

License:Open Source License

public void addHasNext() {
    MethodVisitor mv = super.visitMethod(Opcodes.ACC_PUBLIC, "hasNext", "()Z", null, null);
    mv.visitCode();/*from ww w.  j ava 2 s  .co m*/
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, "java/util/IdentityHashMap$IdentityHashMapIterator", "idx", "I");
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, "java/util/IdentityHashMap$IdentityHashMapIterator", "order",
            "Ljava/util/List;");
    mv.visitMethodInsn(Opcodes.INVOKEINTERFACE, "java/util/List", "size", "()I", true);
    Label l0 = new Label();
    mv.visitJumpInsn(Opcodes.IF_ICMPGE, l0);
    mv.visitInsn(Opcodes.ICONST_1);
    Label l1 = new Label();
    mv.visitJumpInsn(Opcodes.GOTO, l1);
    mv.visitLabel(l0);
    mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
    mv.visitInsn(Opcodes.ICONST_0);
    mv.visitLabel(l1);
    mv.visitFrame(Opcodes.F_SAME1, 0, null, 1, new Object[] { Opcodes.INTEGER });
    mv.visitInsn(Opcodes.IRETURN);
    mv.visitMaxs(2, 1);
    mv.visitEnd();
}

---

From source file:edu.illinois.nondex.instr.PriorityBlockingQueueShufflingAdder.java

License:Open Source License

public void addToString() {
    MethodVisitor mv = super.visitMethod(Opcodes.ACC_PUBLIC, "toString", "()Ljava/lang/String;", null, null);
    mv.visitCode();/* ww w .ja  v a  2  s .  co  m*/
    Label l0 = new Label();
    Label l1 = new Label();
    Label l2 = new Label();
    mv.visitTryCatchBlock(l0, l1, l2, null);
    Label l3 = new Label();
    Label l4 = new Label();
    mv.visitTryCatchBlock(l3, l4, l2, null);
    Label l5 = new Label();
    mv.visitTryCatchBlock(l2, l5, l2, null);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, "java/util/concurrent/PriorityBlockingQueue", "lock",
            "Ljava/util/concurrent/locks/ReentrantLock;");
    mv.visitVarInsn(Opcodes.ASTORE, 1);
    mv.visitVarInsn(Opcodes.ALOAD, 1);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/util/concurrent/locks/ReentrantLock", "lock", "()V", false);
    mv.visitLabel(l0);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, "java/util/concurrent/PriorityBlockingQueue", "size", "I");
    mv.visitVarInsn(Opcodes.ISTORE, 2);
    mv.visitVarInsn(Opcodes.ILOAD, 2);
    mv.visitJumpInsn(Opcodes.IFNE, l3);
    mv.visitLdcInsn("[]");
    mv.visitVarInsn(Opcodes.ASTORE, 3);
    mv.visitLabel(l1);
    mv.visitVarInsn(Opcodes.ALOAD, 1);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/util/concurrent/locks/ReentrantLock", "unlock", "()V",
            false);
    mv.visitVarInsn(Opcodes.ALOAD, 3);
    mv.visitInsn(Opcodes.ARETURN);
    mv.visitLabel(l3);
    mv.visitFrame(Opcodes.F_APPEND, 2,
            new Object[] { "java/util/concurrent/locks/ReentrantLock", Opcodes.INTEGER }, 0, null);
    mv.visitTypeInsn(Opcodes.NEW, "java/lang/StringBuilder");
    mv.visitInsn(Opcodes.DUP);
    mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/StringBuilder", "<init>", "()V", false);
    mv.visitVarInsn(Opcodes.ASTORE, 3);
    mv.visitVarInsn(Opcodes.ALOAD, 3);
    mv.visitIntInsn(Opcodes.BIPUSH, 91);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/StringBuilder", "append",
            "(C)Ljava/lang/StringBuilder;", false);
    mv.visitInsn(Opcodes.POP);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, "java/util/concurrent/PriorityBlockingQueue", "queue",
            "[Ljava/lang/Object;");
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "[Ljava/lang/Object;", "clone", "()Ljava/lang/Object;", false);
    mv.visitTypeInsn(Opcodes.CHECKCAST, "[Ljava/lang/Object;");
    mv.visitVarInsn(Opcodes.ASTORE, 4);
    mv.visitVarInsn(Opcodes.ALOAD, 4);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, "edu/illinois/nondex/shuffling/ControlNondeterminism", "shuffle",
            "([Ljava/lang/Object;)[Ljava/lang/Object;", false);
    mv.visitVarInsn(Opcodes.ASTORE, 4);
    mv.visitInsn(Opcodes.ICONST_0);
    mv.visitVarInsn(Opcodes.ISTORE, 5);
    Label l6 = new Label();
    mv.visitLabel(l6);
    mv.visitFrame(Opcodes.F_APPEND, 3,
            new Object[] { "java/lang/StringBuilder", "[Ljava/lang/Object;", Opcodes.INTEGER }, 0, null);
    mv.visitVarInsn(Opcodes.ILOAD, 5);
    mv.visitVarInsn(Opcodes.ILOAD, 2);
    Label l7 = new Label();
    mv.visitJumpInsn(Opcodes.IF_ICMPGE, l7);
    mv.visitVarInsn(Opcodes.ALOAD, 4);
    mv.visitVarInsn(Opcodes.ILOAD, 5);
    mv.visitInsn(Opcodes.AALOAD);
    mv.visitVarInsn(Opcodes.ASTORE, 6);
    mv.visitVarInsn(Opcodes.ALOAD, 3);
    mv.visitVarInsn(Opcodes.ALOAD, 6);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    Label l8 = new Label();
    mv.visitJumpInsn(Opcodes.IF_ACMPNE, l8);
    mv.visitLdcInsn("(this Collection)");
    Label l9 = new Label();
    mv.visitJumpInsn(Opcodes.GOTO, l9);
    mv.visitLabel(l8);
    mv.visitFrame(Opcodes.F_FULL, 7,
            new Object[] { "java/util/concurrent/PriorityBlockingQueue",
                    "java/util/concurrent/locks/ReentrantLock", Opcodes.INTEGER, "java/lang/StringBuilder",
                    "[Ljava/lang/Object;", Opcodes.INTEGER, "java/lang/Object" },
            1, new Object[] { "java/lang/StringBuilder" });
    mv.visitVarInsn(Opcodes.ALOAD, 6);
    mv.visitLabel(l9);
    mv.visitFrame(Opcodes.F_FULL, 7,
            new Object[] { "java/util/concurrent/PriorityBlockingQueue",
                    "java/util/concurrent/locks/ReentrantLock", Opcodes.INTEGER, "java/lang/StringBuilder",
                    "[Ljava/lang/Object;", Opcodes.INTEGER, "java/lang/Object" },
            2, new Object[] { "java/lang/StringBuilder", "java/lang/Object" });
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/StringBuilder", "append",
            "(Ljava/lang/Object;)Ljava/lang/StringBuilder;", false);
    mv.visitInsn(Opcodes.POP);
    mv.visitVarInsn(Opcodes.ILOAD, 5);
    mv.visitVarInsn(Opcodes.ILOAD, 2);
    mv.visitInsn(Opcodes.ICONST_1);
    mv.visitInsn(Opcodes.ISUB);
    Label l10 = new Label();
    mv.visitJumpInsn(Opcodes.IF_ICMPEQ, l10);
    mv.visitVarInsn(Opcodes.ALOAD, 3);
    mv.visitIntInsn(Opcodes.BIPUSH, 44);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/StringBuilder", "append",
            "(C)Ljava/lang/StringBuilder;", false);
    mv.visitIntInsn(Opcodes.BIPUSH, 32);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/StringBuilder", "append",
            "(C)Ljava/lang/StringBuilder;", false);
    mv.visitInsn(Opcodes.POP);
    mv.visitLabel(l10);
    mv.visitFrame(Opcodes.F_CHOP, 1, null, 0, null);
    mv.visitIincInsn(5, 1);
    mv.visitJumpInsn(Opcodes.GOTO, l6);
    mv.visitLabel(l7);
    mv.visitFrame(Opcodes.F_CHOP, 1, null, 0, null);
    mv.visitVarInsn(Opcodes.ALOAD, 3);
    mv.visitIntInsn(Opcodes.BIPUSH, 93);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/StringBuilder", "append",
            "(C)Ljava/lang/StringBuilder;", false);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/StringBuilder", "toString", "()Ljava/lang/String;",
            false);
    mv.visitVarInsn(Opcodes.ASTORE, 5);
    mv.visitLabel(l4);
    mv.visitVarInsn(Opcodes.ALOAD, 1);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/util/concurrent/locks/ReentrantLock", "unlock", "()V",
            false);
    mv.visitVarInsn(Opcodes.ALOAD, 5);
    mv.visitInsn(Opcodes.ARETURN);
    mv.visitLabel(l2);
    mv.visitFrame(Opcodes.F_FULL, 2, new Object[] { "java/util/concurrent/PriorityBlockingQueue",
            "java/util/concurrent/locks/ReentrantLock" }, 1, new Object[] { "java/lang/Throwable" });
    mv.visitVarInsn(Opcodes.ASTORE, 7);
    mv.visitLabel(l5);
    mv.visitVarInsn(Opcodes.ALOAD, 1);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/util/concurrent/locks/ReentrantLock", "unlock", "()V",
            false);
    mv.visitVarInsn(Opcodes.ALOAD, 7);
    mv.visitInsn(Opcodes.ATHROW);
    mv.visitMaxs(3, 8);
    mv.visitEnd();
}

---

From source file:edu.illinois.nondex.instr.PriorityQueueShufflingAdder.java

License:Open Source License

public void addNext() {
    MethodVisitor mv = super.visitMethod(Opcodes.ACC_PUBLIC, "next", "()Ljava/lang/Object;", "()TE;", null);
    mv.visitCode();//from w  w w .j ava  2s.  c  om
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, "java/util/PriorityQueue$Itr", "expectedModCount", "I");
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, "java/util/PriorityQueue$Itr", "this$0", "Ljava/util/PriorityQueue;");
    mv.visitFieldInsn(Opcodes.GETFIELD, "java/util/PriorityQueue", "modCount", "I");
    Label l0 = new Label();
    mv.visitJumpInsn(Opcodes.IF_ICMPEQ, l0);
    mv.visitTypeInsn(Opcodes.NEW, "java/util/ConcurrentModificationException");
    mv.visitInsn(Opcodes.DUP);
    mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/util/ConcurrentModificationException", "<init>", "()V",
            false);
    mv.visitInsn(Opcodes.ATHROW);
    mv.visitLabel(l0);
    mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, "java/util/PriorityQueue$Itr", "iter", "Ljava/util/Iterator;");
    mv.visitMethodInsn(Opcodes.INVOKEINTERFACE, "java/util/Iterator", "next", "()Ljava/lang/Object;", true);
    mv.visitFieldInsn(Opcodes.PUTFIELD, "java/util/PriorityQueue$Itr", "lastRetElt", "Ljava/lang/Object;");
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitInsn(Opcodes.ICONST_M1);
    mv.visitFieldInsn(Opcodes.PUTFIELD, "java/util/PriorityQueue$Itr", "lastRet", "I");
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, "java/util/PriorityQueue$Itr", "lastRetElt", "Ljava/lang/Object;");
    mv.visitInsn(Opcodes.ARETURN);
    mv.visitMaxs(2, 1);
    mv.visitEnd();
}

---

From source file:edu.illinois.nondex.instr.WeakHashMapShufflingAdder.java

License:Open Source License

public void addNextEntry() {
    MethodVisitor mv = super.visitMethod(Opcodes.ACC_PUBLIC, "nextEntry", "()Ljava/util/WeakHashMap$Entry;",
            "()Ljava/util/WeakHashMap$Entry<TK;TV;>;", null);
    mv.visitCode();//from  www. j a v  a 2 s .c  o m
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, "java/util/WeakHashMap$HashIterator", "this$0",
            "Ljava/util/WeakHashMap;");
    mv.visitFieldInsn(Opcodes.GETFIELD, "java/util/WeakHashMap", "modCount", "I");
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, "java/util/WeakHashMap$HashIterator", "expectedModCount", "I");
    Label l0 = new Label();
    mv.visitJumpInsn(Opcodes.IF_ICMPEQ, l0);
    mv.visitTypeInsn(Opcodes.NEW, "java/util/ConcurrentModificationException");
    mv.visitInsn(Opcodes.DUP);
    mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/util/ConcurrentModificationException", "<init>", "()V",
            false);
    mv.visitInsn(Opcodes.ATHROW);
    mv.visitLabel(l0);
    mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, "java/util/WeakHashMap$HashIterator", "iter", "Ljava/util/Iterator;");
    mv.visitMethodInsn(Opcodes.INVOKEINTERFACE, "java/util/Iterator", "next", "()Ljava/lang/Object;", true);
    mv.visitTypeInsn(Opcodes.CHECKCAST, "java/util/WeakHashMap$Entry");
    mv.visitFieldInsn(Opcodes.PUTFIELD, "java/util/WeakHashMap$HashIterator", "lastReturned",
            "Ljava/util/WeakHashMap$Entry;");
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, "java/util/WeakHashMap$HashIterator", "lastReturned",
            "Ljava/util/WeakHashMap$Entry;");
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/util/WeakHashMap$Entry", "get", "()Ljava/lang/Object;",
            false);
    mv.visitFieldInsn(Opcodes.PUTFIELD, "java/util/WeakHashMap$HashIterator", "currentKey",
            "Ljava/lang/Object;");
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitFieldInsn(Opcodes.GETFIELD, "java/util/WeakHashMap$HashIterator", "lastReturned",
            "Ljava/util/WeakHashMap$Entry;");
    mv.visitInsn(Opcodes.ARETURN);
    mv.visitMaxs(2, 1);
    mv.visitEnd();
}

---

From source file:erjang.beam.CompilerVisitor.java

License:Apache License

private static void make_invoke_method(ClassWriter cw, String outer_name, String mname, int arity, boolean proc,
        int freevars, Type returnType, boolean isTailCall) {
    MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "invoke", EUtil.getSignature(arity - freevars, true), null,
            PAUSABLE_EX);/*www  . j  ava 2  s.  c  o m*/
    mv.visitCode();
    if (proc) {
        mv.visitVarInsn(ALOAD, 1);
    }
    for (int i = 0; i < arity - freevars; i++) {
        mv.visitVarInsn(ALOAD, i + 2);
    }
    for (int i = 0; i < freevars; i++) {
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, outer_name + "$FN_" + mname, "fv" + i, EOBJECT_DESC);
    }
    mv.visitMethodInsn(INVOKESTATIC, outer_name, mname, EUtil.getSignature(arity, proc, returnType));

    if (isTailCall) {
        mv.visitVarInsn(ASTORE, arity + 2);

        Label done = new Label();
        Label loop = new Label();
        mv.visitLabel(loop);
        mv.visitVarInsn(ALOAD, arity + 2);
        if (EProc.TAIL_MARKER == null) {
            mv.visitJumpInsn(IFNONNULL, done);
        } else {
            mv.visitFieldInsn(GETSTATIC, EPROC_NAME, "TAIL_MARKER", EOBJECT_DESC);
            mv.visitJumpInsn(IF_ACMPNE, done);
        }

        // load proc
        mv.visitVarInsn(ALOAD, 1);
        mv.visitFieldInsn(GETFIELD, EPROC_NAME, "tail", EFUN_DESCRIPTOR);
        mv.visitVarInsn(ALOAD, 1);

        mv.visitMethodInsn(INVOKEVIRTUAL, EFUN_NAME, "go", GO_DESC);
        mv.visitVarInsn(ASTORE, arity + 2);

        mv.visitJumpInsn(GOTO, loop);

        mv.visitLabel(done);
        mv.visitVarInsn(ALOAD, arity + 2);
    }

    mv.visitInsn(ARETURN);
    mv.visitMaxs(arity + 2, arity + 2);
    mv.visitEnd();
}

---

From source file:erjang.EFun.java

License:Apache License

private static void make_cast_method(ClassWriter cw, int n) {
    MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC | Opcodes.ACC_STATIC, "cast",
            "(" + EOBJECT_DESC + ")L" + EFUN_NAME + n + ";", null, null);
    mv.visitCode();// w w  w . jav  a  2 s  .  c  o  m

    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitTypeInsn(INSTANCEOF, EFUN_NAME + n);

    Label fail = new Label();

    mv.visitJumpInsn(Opcodes.IFEQ, fail);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitTypeInsn(Opcodes.CHECKCAST, EFUN_NAME + n);
    mv.visitInsn(Opcodes.ARETURN);

    mv.visitLabel(fail);
    mv.visitInsn(Opcodes.ACONST_NULL);
    mv.visitInsn(Opcodes.ARETURN);

    mv.visitMaxs(2, 2);
    mv.visitEnd();
}

---

From source file:erjang.EFun.java

License:Apache License

private static void make_invoke_method(ClassWriter cw, String self_type, int arity) {
    MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "invoke", EUtil.getSignature(arity, true), null, PAUSABLE_EX);
    mv.visitCode();/*from  ww w . j a  v a2 s .c o m*/
    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(ALOAD, 1);
    for (int i = 0; i < arity; i++) {
        mv.visitVarInsn(ALOAD, i + 2);
    }
    mv.visitMethodInsn(INVOKEVIRTUAL, self_type, "invoke_tail", EUtil.getSignature(arity, true));
    mv.visitVarInsn(ASTORE, arity + 2);

    Label done = new Label();
    Label loop = new Label();
    mv.visitLabel(loop);
    mv.visitVarInsn(ALOAD, arity + 2);
    if (EProc.TAIL_MARKER == null) {
        mv.visitJumpInsn(IFNONNULL, done);
    } else {
        mv.visitFieldInsn(GETSTATIC, EPROC_TYPE.getInternalName(), "TAIL_MARKER", EOBJECT_TYPE.getDescriptor());
        mv.visitJumpInsn(IF_ACMPNE, done);
    }

    // load proc
    mv.visitVarInsn(ALOAD, 1);
    mv.visitFieldInsn(GETFIELD, EPROC_TYPE.getInternalName(), "tail", EFUN_TYPE.getDescriptor());
    mv.visitVarInsn(ALOAD, 1);

    mv.visitMethodInsn(INVOKEVIRTUAL, EFUN_TYPE.getInternalName(), "go", GO_DESC);
    mv.visitVarInsn(ASTORE, arity + 2);

    mv.visitJumpInsn(GOTO, loop);

    mv.visitLabel(done);
    mv.visitVarInsn(ALOAD, arity + 2);
    mv.visitInsn(ARETURN);
    mv.visitMaxs(arity + 2, arity + 2);
    mv.visitEnd();
}

---

From source file:erjang.ETuple.java

License:Apache License

private static void create_tuple_nth(int n_cells, ClassAdapter cw, String this_class_name) {
    MethodVisitor mv;
    mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "elm", "(I)" + ETERM_TYPE.getDescriptor(), null, null);
    mv.visitCode();//from   ww  w. j  a v a  2s  .c o  m

    Label dflt = new Label();
    Label[] labels = new Label[n_cells];
    for (int i = 0; i < n_cells; i++) {
        labels[i] = new Label();
    }

    mv.visitVarInsn(Opcodes.ILOAD, 1);
    mv.visitTableSwitchInsn(1, n_cells, dflt, labels);

    for (int zbase = 0; zbase < n_cells; zbase++) {

        mv.visitLabel(labels[zbase]);

        mv.visitVarInsn(Opcodes.ALOAD, 0); // load this
        String field = "elem" + (zbase + 1);

        mv.visitFieldInsn(Opcodes.GETFIELD, this_class_name, field, ETERM_TYPE.getDescriptor());
        mv.visitInsn(Opcodes.ARETURN);
    }

    mv.visitLabel(dflt);

    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitVarInsn(Opcodes.ILOAD, 1);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, ETUPLE_NAME, "bad_nth", "(I)" + ETERM_TYPE.getDescriptor());
    mv.visitInsn(Opcodes.ARETURN); // make compiler happy

    mv.visitMaxs(3, 2);
    mv.visitEnd();
}

---

From source file:erjang.ETuple.java

License:Apache License

private static void create_tuple_set(int n_cells, ClassAdapter cw, String this_class_name) {
    MethodVisitor mv;
    mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "set", "(I" + ETERM_TYPE.getDescriptor() + ")V", null, null);
    mv.visitCode();//from   w  w  w  .  j ava 2 s .c  om

    Label dflt = new Label();
    Label[] labels = new Label[n_cells];
    for (int i = 0; i < n_cells; i++) {
        labels[i] = new Label();
    }

    mv.visitVarInsn(Opcodes.ILOAD, 1);
    mv.visitTableSwitchInsn(1, n_cells, dflt, labels);

    for (int zbase = 0; zbase < n_cells; zbase++) {

        mv.visitLabel(labels[zbase]);

        mv.visitVarInsn(Opcodes.ALOAD, 0); // load this
        mv.visitVarInsn(Opcodes.ALOAD, 2); // load term

        String field = "elem" + (zbase + 1);

        mv.visitFieldInsn(Opcodes.PUTFIELD, this_class_name, field, ETERM_TYPE.getDescriptor());
        mv.visitInsn(Opcodes.RETURN);
    }

    mv.visitLabel(dflt);

    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitVarInsn(Opcodes.ILOAD, 1);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, ETUPLE_NAME, "bad_nth", "(I)" + ETERM_TYPE.getDescriptor());
    mv.visitInsn(Opcodes.POP);
    mv.visitInsn(Opcodes.RETURN); // make compiler happy

    mv.visitMaxs(3, 3);
    mv.visitEnd();
}

---

From source file:erjang.ETuple.java

License:Apache License

private static void create_cast(ClassAdapter cw, int n) {
    MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC | Opcodes.ACC_STATIC, "cast",
            "(L" + ETUPLE_NAME + ";)L" + ETUPLE_NAME + n + ";", null, null);
    mv.visitCode();/*from  w ww.  j a  v a 2  s .  c  o  m*/

    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, ETUPLE_NAME, "arity", "()I");

    if (n <= 5) {
        mv.visitInsn(Opcodes.ICONST_0 + n);
    } else {
        mv.visitLdcInsn(new Integer(n));
    }

    Label fail = new Label();

    mv.visitJumpInsn(Opcodes.IF_ICMPNE, fail);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitTypeInsn(Opcodes.CHECKCAST, ETUPLE_NAME + n);
    mv.visitInsn(Opcodes.ARETURN);

    mv.visitLabel(fail);
    mv.visitInsn(Opcodes.ACONST_NULL);
    mv.visitInsn(Opcodes.ARETURN);

    mv.visitMaxs(2, 2);
    mv.visitEnd();
}

---

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