Example usage for org.objectweb.asm MethodVisitor visitJumpInsn

List of usage examples for org.objectweb.asm MethodVisitor visitJumpInsn

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Introduction

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

Prototype

public void visitJumpInsn(final int opcode, final Label label)

Source Link

Document

Visits a jump instruction.

Usage

From source file:jtaint.ServletAdapter.java

License:Apache License

private void buildTaintedReturnWrapper(MethodVisitor mv, Klass k, int access, String name, String desc) {
    mv.visitCode();// w  ww .  j a v  a  2  s  . com
    Type[] args = Type.getArgumentTypes(desc);
    Type ret = Type.getReturnType(desc);
    boolean isStatic = (access & ACC_STATIC) != 0;
    int l = 0;

    if (!isStatic) {
        mv.visitVarInsn(ALOAD, 0);
        l = 1;
    }

    for (int i = 0; i < args.length; l += args[i].getSize(), i++)
        mv.visitVarInsn(args[i].getOpcode(ILOAD), l);
    mv.visitMethodInsn(isStatic ? INVOKESTATIC : INVOKESPECIAL, className, ByteCodeUtil.internalName(name),
            desc);

    String taintDesc = Type.getMethodDescriptor(ret, new Type[] { ret });

    if (k.isExact()) {
        /* We already know that we need to wrap...no runtime check needed */
        mv.visitMethodInsn(INVOKESTATIC, "jtaint/StringUtil", "toTainted", taintDesc);
        mv.visitInsn(ARETURN);
        mv.visitMaxs(l, l);
        mv.visitEnd();
        return;
    }

    /* Now taint the return type, if we need to */
    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, className, ByteCodeUtil.internalName("is" + k.simpleName()), "Z");
    Label l0 = new Label();
    mv.visitJumpInsn(IFEQ, l0);
    mv.visitMethodInsn(INVOKESTATIC, "jtaint/StringUtil", "toTainted", taintDesc);

    mv.visitLabel(l0);
    if (version == V1_6)
        mv.visitFrame(F_SAME1, 0, null, 1, new Object[] { ret.getInternalName() });
    mv.visitInsn(ARETURN);
    mv.visitMaxs(Math.max(l, 2), l);
    mv.visitEnd();
}

From source file:jtaint.ServletAdapter.java

License:Apache License

private void buildServletWrapper(MethodVisitor mv, Klass k, String name, String desc) {
    mv.visitCode();/*w  ww  .j av a 2s .co m*/

    Label start = new Label(), end = new Label(), handler = new Label();
    mv.visitTryCatchBlock(start, end, handler, null);
    mv.visitLabel(start);

    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, className, ByteCodeUtil.internalName("is" + k.simpleName()), "Z");
    Label l0 = new Label();
    mv.visitJumpInsn(IFEQ, l0);

    Type[] t = Type.getArgumentTypes(desc);

    mv.visitVarInsn(ALOAD, 1);
    mv.visitMethodInsn(INVOKEINTERFACE, t[0].getInternalName(), "getParameterMap", "()Ljava/util/Map;");

    mv.visitVarInsn(ALOAD, 1);
    mv.visitMethodInsn(INVOKEINTERFACE, t[0].getInternalName(), "getRemoteHost", "()Ljava/lang/String;");

    mv.visitVarInsn(ALOAD, 1);
    mv.visitMethodInsn(INVOKEINTERFACE, t[0].getInternalName(), "getRemoteAddr", "()Ljava/lang/String;");

    mv.visitMethodInsn(INVOKESTATIC, "jtaint/HttpUtil", "preService",
            "(Ljava/util/Map;Ljava/lang/String;Ljava/lang/String;)V");
    mv.visitLabel(l0);
    if (version == V1_6)
        mv.visitFrame(F_SAME, 0, null, 0, null);

    mv.visitVarInsn(ALOAD, 0);
    int l = 1;

    for (int i = 0; i < t.length; l += t[i].getSize(), i++)
        mv.visitVarInsn(t[i].getOpcode(ILOAD), l);
    mv.visitMethodInsn(INVOKESPECIAL, className, ByteCodeUtil.internalName(name), desc);

    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, className, ByteCodeUtil.internalName("is" + k.simpleName()), "Z");
    Label l1 = new Label();
    mv.visitJumpInsn(IFEQ, l1);

    mv.visitMethodInsn(INVOKESTATIC, "jtaint/HttpUtil", "postService", "()V");
    mv.visitLabel(l1);
    if (version == V1_6)
        mv.visitFrame(F_SAME, 0, null, 0, null);
    mv.visitInsn(RETURN);
    mv.visitLabel(end);

    mv.visitLabel(handler);
    if (version == V1_6)
        mv.visitFrame(F_SAME1, 0, null, 1, new Object[] { "java/lang/Throwable" });

    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, className, ByteCodeUtil.internalName("is" + k.simpleName()), "Z");
    Label l2 = new Label();
    mv.visitJumpInsn(IFEQ, l2);
    mv.visitMethodInsn(INVOKESTATIC, "jtaint/HttpUtil", "postService", "()V");
    mv.visitLabel(l2);
    if (version == V1_6)
        mv.visitFrame(F_SAME1, 0, null, 1, new Object[] { "java/lang/Throwable" });

    mv.visitInsn(ATHROW);
    mv.visitMaxs(Math.max(l, 3), l);
    mv.visitEnd();
}

From source file:jtaint.ServletAdapter.java

License:Apache License

private void buildGetPathTranslatedWrapper(MethodVisitor mv) {
    mv.visitCode();//from  w w w.  ja  v a  2  s  .co m

    mv.visitVarInsn(ALOAD, 0);
    mv.visitMethodInsn(INVOKESPECIAL, className, ByteCodeUtil.internalName("getPathTranslated"),
            "()Ljava/lang/String;");
    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, className, ByteCodeUtil.internalName("isHttpServletRequest"), "Z");
    Label l0 = new Label();
    mv.visitJumpInsn(IFEQ, l0);

    mv.visitVarInsn(ALOAD, 0);
    mv.visitMethodInsn(INVOKESTATIC, "jtaint/HttpUtil", "getPathTranslated",
            "(Ljava/lang/String;Ljava/lang/Object;)Ljava/lang/String;");

    mv.visitLabel(l0);
    if (version == V1_6)
        mv.visitFrame(F_SAME1, 0, null, 1, new Object[] { "java/lang/String" });
    mv.visitInsn(ARETURN);
    mv.visitMaxs(2, 1);
    mv.visitEnd();
}

From source file:jtaint.ServletAdapter.java

License:Apache License

private void buildHtmlValidatorWrapper(MethodVisitor mv, String name, String desc) {
    mv.visitCode();//ww  w  .j  av a 2 s .c  o  m

    Type[] t = Type.getArgumentTypes(desc);
    Type r = Type.getReturnType(desc);

    mv.visitVarInsn(ALOAD, 0);
    int l = 1;

    for (int i = 0; i < t.length; l += t[i].getSize(), i++)
        mv.visitVarInsn(t[i].getOpcode(ILOAD), l);
    mv.visitMethodInsn(INVOKESPECIAL, className, ByteCodeUtil.internalName(name), desc);

    Label l0 = new Label();
    mv.visitInsn(DUP);
    mv.visitJumpInsn(IFNULL, l0);

    mv.visitInsn(DUP);
    mv.visitMethodInsn(INVOKEVIRTUAL, r.getInternalName(), ByteCodeUtil.internalName("getHtmlValidator"),
            "()Ljtaint/HtmlValidator;");
    mv.visitJumpInsn(IFNONNULL, l0);

    /* Okay, we have a valid print object and null html validator, time 
     * to initialize...
     */

    mv.visitInsn(DUP);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitMethodInsn(INVOKESTATIC, "jtaint/HttpUtil", "getHtmlValidator",
            "(Ljava/lang/Object;)Ljtaint/HtmlValidator;");
    mv.visitMethodInsn(INVOKEVIRTUAL, r.getInternalName(), ByteCodeUtil.internalName("setHtmlValidator"),
            "(Ljtaint/HtmlValidator;)V");

    mv.visitLabel(l0);
    if (version == V1_6)
        mv.visitFrame(F_SAME1, 0, null, 1, new Object[] { r.getInternalName() });
    mv.visitInsn(ARETURN);

    mv.visitMaxs(Math.max(l, 3), l);
    mv.visitEnd();
}

From source file:jtaint.SqlAdapter.java

License:Apache License

private void addSqlValidator() {
    MethodVisitor mv = cv.visitMethod(ACC_PUBLIC
            //[ifJava4]
            + ACC_SYNCHRONIZED//from  w  w  w .j a  v a 2 s  .c o  m
    //[fiJava4] 
            , ByteCodeUtil.internalName("sqlValidator"), "()Ljtaint/SqlValidator;", null, null);
    mv.visitCode();
    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, className, ByteCodeUtil.internalName("validator"), "Ljtaint/SqlValidator;");
    mv.visitInsn(DUP);

    Label l0 = new Label();
    mv.visitJumpInsn(IFNULL, l0);
    mv.visitInsn(ARETURN);

    mv.visitLabel(l0);
    if (version == V1_6)
        mv.visitFrame(F_SAME1, 0, null, 1, new Object[] { "jtaint/SqlValidator" });

    mv.visitInsn(POP);

    /* XXX This is an industrial-sized barrel of fun. We have to avoid
     * infinite recursion here when initializing the validator field --
     * i.e. when sqlValidator is called for the first time. In this case,
     * what can happen is:
     * connection.sqlValidator -> jtaint.SqlUtil.getSqlValidator
     * -> Connection.getDatabaseMetadata 
     * -> Connection.sqlValidator ->
     * -> jtaint.SqlUtil.getSqlValidator
     * -> Connection.getDatabaseMetadata
     * ... (repeat last three steps forever), where -> denotes a method call
     * So if we ever find that we already own the lock that we are about
     * to acquire, then we return an EmptySqlValidator to break
     * the recursion(Note that once the recursion unwinds, the validator
     * field will be correctly set, so we will begin returning the correct
     * sql validator. This corner case applies only during initialization).
     */

    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, className, ByteCodeUtil.internalName("lockObj"), "Ljava/lang/Object;");
    mv.visitInsn(DUP);
    mv.visitMethodInsn(INVOKESTATIC, "java/lang/Thread", "holdsLock", "(Ljava/lang/Object;)Z");
    Label l1 = new Label();
    mv.visitJumpInsn(IFEQ, l1);

    /* Break the recursion */
    mv.visitFieldInsn(GETSTATIC, "jtaint/EmptySqlValidator", "INSTANCE", "Ljtaint/EmptySqlValidator;");
    mv.visitInsn(ARETURN);

    /* No recursion -- acquire the lock and initialize our field */
    mv.visitLabel(l1);
    if (version == V1_6)
        mv.visitFrame(F_SAME1, 0, null, 1, new Object[] { "java/lang/Object" });
    mv.visitInsn(DUP);
    mv.visitInsn(MONITORENTER);

    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, className, ByteCodeUtil.internalName("validator"), "Ljtaint/SqlValidator;");
    mv.visitInsn(DUP);
    Label l2 = new Label();
    mv.visitJumpInsn(IFNULL, l2);
    mv.visitInsn(SWAP);
    mv.visitInsn(MONITOREXIT);
    mv.visitInsn(ARETURN);

    mv.visitLabel(l2);
    if (version == V1_6)
        mv.visitFrame(F_FULL, 1, new Object[] { className }, 2,
                new Object[] { "java/lang/Object", "jtaint/SqlValidator" });
    mv.visitInsn(POP);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitInsn(DUP);
    mv.visitMethodInsn(INVOKESTATIC, "jtaint/SqlUtil", "getSqlValidator",
            "(Ljava/lang/Object;)Ljtaint/SqlValidator;");
    mv.visitInsn(DUP_X1);
    mv.visitFieldInsn(PUTFIELD, className, ByteCodeUtil.internalName("validator"), "Ljtaint/SqlValidator;");
    mv.visitInsn(SWAP);
    mv.visitInsn(MONITOREXIT);
    mv.visitInsn(ARETURN);

    mv.visitMaxs(4, 1);
    mv.visitEnd();
}

From source file:jtaint.StringAdapter.java

License:Apache License

/** Create new method that compares its argument to the package-private
 * constant Character.ERROR. This must be exported for jtaint helper
 * methods. Equivalent to the following Java code:
 *
 * public static boolean isError(int c) {
 *     return c == Character.ERROR;// ww  w .  j a  v  a  2  s .c om
 * }
 */
private void addIsErrorMethod(ClassVisitor cv) {
    boolean isError = false;
    MethodVisitor mv = cv.visitMethod(ACC_PUBLIC + ACC_STATIC, ByteCodeUtil.internalName("isError"), "(I)Z",
            null, null);
    mv.visitCode();
    mv.visitVarInsn(ILOAD, 0);

    /* Test to see if java/lang/Character uses ERROR or CHAR_ERROR 
     * If ERROR cannot be found, an getDeclaredFields throws an exception
     */
    try {
        Character.class.getDeclaredField("ERROR");
        isError = true;
    } catch (Throwable th) {
        /* ignore */ }

    if (isError)
        mv.visitFieldInsn(GETSTATIC, "java/lang/Character", "ERROR", "I");
    else
        mv.visitFieldInsn(GETSTATIC, "java/lang/Character", "CHAR_ERROR", "C");

    Label l = new Label();
    mv.visitJumpInsn(IF_ICMPEQ, l);
    mv.visitInsn(ICONST_0);
    mv.visitInsn(IRETURN);

    mv.visitLabel(l);
    if (version == V1_6)
        mv.visitFrame(F_SAME, 0, null, 0, null);

    mv.visitInsn(ICONST_1);
    mv.visitInsn(IRETURN);
    mv.visitMaxs(2, 1);
    mv.visitEnd();
}

From source file:jtaint.StringAdapter.java

License:Apache License

/** Create a new method that returns a Taint object representing the taint
 * for this String. Equivalent to the following Java code:
 * /* w  w w. j  a  v a 2 s  . com*/
 * public Taint taint() {
 *     if (!tainted) {
 *         return null;
 *     } else {
 *         return jtaint.StringUtil.stringToTaint(value, count);
 *     }
 * }
 */

private void addTaintMethod(ClassVisitor cv) {
    MethodVisitor mv = cv.visitMethod(ACC_PUBLIC, ByteCodeUtil.internalName("taint"), "()Ljtaint/Taint;", null,
            null);
    mv.visitCode();

    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, className, ByteCodeUtil.internalName("tainted"), "Z");

    Label l = new Label();
    mv.visitJumpInsn(IFNE, l);
    mv.visitInsn(ACONST_NULL);
    mv.visitInsn(ARETURN);

    mv.visitLabel(l);
    if (version == V1_6)
        mv.visitFrame(F_SAME, 0, null, 0, null);

    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, className, "value", "[C");
    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, className, "count", "I");
    mv.visitMethodInsn(INVOKESTATIC, "jtaint/StringUtil", "stringToTaint", "([CI)Ljtaint/Taint;");
    mv.visitInsn(ARETURN);
    mv.visitMaxs(4, 1);
    mv.visitEnd();
}

From source file:jtaint.StringAdapter.java

License:Apache License

/** Add a new constructor to a create a (partially or fully) tainted 
 * String. Equivalent to the following Java code:
 *
 * public String(String original, Taint t) {
 *     super();//from ww  w. ja  v  a 2  s  .c o m
 *     this.count = original.count;
 *
 *     if (!t.isTainted()) {
 *         this.offset = original.offset;
 *         this.value = original.value;
 *         this.tainted = original.tainted;
 *         return
 *     }
 *
 *     this.offset = 0;
 *     this.value = jtaint.StringUtil.taintToString(original, t)
 *     if (this.value.length == this.count)
 *         this.tainted = false;
 *     else
 *         this.tainted = true;
 *     return;
 * The final check (if value.length == count) is true only when an error
 * occurs during the execution of taintToString
 */

private void addConstructor(ClassVisitor cv) {
    MethodVisitor mv = cv.visitMethod(ACC_PUBLIC, "<init>", "(Ljava/lang/String;Ljtaint/Taint;)V", null, null);
    mv.visitCode();
    mv.visitVarInsn(ALOAD, 0);
    mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");

    copyField(mv, "count", "I");

    Label l0 = new Label();
    mv.visitVarInsn(ALOAD, 2);
    mv.visitMethodInsn(INVOKEVIRTUAL, "jtaint/Taint", "isTainted", "()Z");
    mv.visitJumpInsn(IFNE, l0);

    /* Taint object is actually untainted, copy all fields and return */
    copyField(mv, "offset", "I");
    copyField(mv, "value", "[C");
    copyField(mv, ByteCodeUtil.internalName("tainted"), "Z");
    mv.visitInsn(RETURN);

    mv.visitLabel(l0);
    if (version == V1_6)
        mv.visitFrame(F_SAME, 0, null, 0, null);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitInsn(ICONST_0);
    mv.visitFieldInsn(PUTFIELD, className, "offset", "I");

    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(ALOAD, 1);
    mv.visitVarInsn(ALOAD, 2);
    mv.visitMethodInsn(INVOKESTATIC, "jtaint/StringUtil", "taintToString",
            "(Ljava/lang/String;Ljtaint/Taint;)[C");
    mv.visitInsn(DUP_X1);
    mv.visitFieldInsn(PUTFIELD, className, "value", "[C");
    mv.visitInsn(ARRAYLENGTH);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, className, "count", "I");

    Label l1 = new Label();
    mv.visitJumpInsn(IF_ICMPEQ, l1);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitInsn(ICONST_1);
    mv.visitFieldInsn(PUTFIELD, className, ByteCodeUtil.internalName("tainted"), "Z");
    mv.visitInsn(RETURN);

    mv.visitLabel(l1);
    if (version == V1_6)
        mv.visitFrame(F_SAME, 0, null, 0, null);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitInsn(ICONST_0);
    mv.visitFieldInsn(PUTFIELD, className, ByteCodeUtil.internalName("tainted"), "Z");

    mv.visitInsn(RETURN);

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

From source file:jtaint.XssAdapter.java

License:Apache License

private void buildWriteIntWrapper(final MethodVisitor mv, final String methodName, final String desc) {
    new XssLockBuilder(mv, version, className, methodName, desc) {
        public void onUnlocked() {
            mv.visitVarInsn(ALOAD, 0);// w  ww  . j av a 2s.  co m
            mv.visitMethodInsn(INVOKEVIRTUAL, className, ByteCodeUtil.internalName("getHtmlValidator"),
                    "()Ljtaint/HtmlValidator;");

            if ("javax/servlet/ServletOutputStream".equals(className)) {
                mv.visitVarInsn(ILOAD, 1);
                mv.visitInsn(I2B);
                mv.visitMethodInsn(INVOKEVIRTUAL, "jtaint/HtmlValidator", "write", "(B)V");
            } else if ("java/io/PrintWriter".equals(className)) {
                mv.visitVarInsn(ILOAD, 1);
                mv.visitInsn(I2C);
                mv.visitMethodInsn(INVOKEVIRTUAL, "jtaint/HtmlValidator", "print", "(C)V");
            } else {
                /* Runtime check required */
                Label l0 = new Label();
                Label l1 = new Label();

                mv.visitVarInsn(ALOAD, 0);
                mv.visitTypeInsn(INSTANCEOF, "java/io/PrintWriter");
                mv.visitJumpInsn(IFNE, l1);

                /* If-branch, we're a ServletOutputStream.  */
                mv.visitVarInsn(ILOAD, 1);
                mv.visitInsn(I2B);
                mv.visitMethodInsn(INVOKEVIRTUAL, "jtaint/HtmlValidator", "write", "(B)V");
                mv.visitJumpInsn(GOTO, l0);

                /* Else-branch, we're a PrintWriter  */
                mv.visitLabel(l1);
                if (version == V1_6)
                    mv.visitFrame(F_SAME1, 0, null, 1, new Object[] { "jtaint/HtmlValidator" });

                mv.visitVarInsn(ILOAD, 1);
                mv.visitInsn(I2C);
                mv.visitMethodInsn(INVOKEVIRTUAL, "jtaint/HtmlValidator", "print", "(C)V");
                mv.visitLabel(l0);
                if (version == V1_6) {
                    mv.visitFrame(F_SAME, 0, null, 0, null);
                    /* We can't end on a visitFrame because 
                     * InstrumentationLockAdapter performs a visitFrame 
                     * after this method completes. Two consecutive 
                     * visitFrames cause the Java 6 type checker to barf, 
                     * so just pad with a single NOP.
                     */
                    mv.visitInsn(NOP);
                }
            }
        }
    }.build();
}

From source file:kilim.analysis.CallWeaver.java

License:Open Source License

/**
 * <pre>//from   www  .  j  av  a  2  s  . com
 * The following template is produced in the method's prelude for each
 * pausable method. 
 * F_REWIND: 
 *   for each bottom stack operand
 *      introduce a dummy constant of the appropriate type.
 *         (iconst_0, aconst_null, etc.)
 *      if the call is not static, 
 *         we need the called object's object reference
 *         ask the next state in the fiber's list
 *   goto F_CALL: // jump to the invocation site.
 * </pre>
 * 
 * @param mv
 */
void genRewind(MethodVisitor mv) {
    Frame f = bb.startFrame;

    // The last parameter to the method is fiber, but the original
    // code doesn't know that and will use up that slot as it
    // pleases. If we are going to jump directly to the basicblock
    // bb, we'll have to make sure it has some dummy value of that
    // type going in just to keep the verifier happy. 

    for (int i = methodWeaver.getFiberArgVar(); i < f.getMaxLocals();) {
        Value v = f.getLocal(i);
        if (v.getTypeDesc() != D_UNDEFINED) {
            //            if (u.isLiveIn(i)) {
            int vmt = toVmType(v.getTypeDesc());
            mv.visitInsn(VMType.constInsn[vmt]);
            storeVar(mv, vmt, i);
        }
        i += v.isCategory2() ? 2 : 1;
    }

    // store dummy values in stack. The constants have to correspond
    // to the types of each of the bottom elements.
    int numBottom = getNumBottom();

    // spos == stack pos. Note that it is incremented beyond the
    // 'for' loop below.
    int spos;
    for (spos = 0; spos < numBottom; spos++) {
        Value v = f.getStack(spos);
        if (v.isConstant()) {
            mv.visitInsn(VMType.constInsn[VMType.toVmType(v.getTypeDesc())]);
        } else {
            ValInfo vi = valInfoList.find(v);
            mv.visitInsn(VMType.constInsn[vi.vmt]);
        }
    }
    if (!isStaticCall()) {
        // The next element in the stack after numBottom is the object
        // reference for the callee. This can't be a dummy because it 
        // is needed by the invokevirtual call. If this reference
        // is found in the local vars, we'll use it, otherwise we need
        // to dip into the next activation frame in the fiber to
        // retrieve it.
        Value v = f.getStack(numBottom);
        if (!methodWeaver.isStatic() && f.getLocal(0) == v) {
            // "this" is already properly initialized.
            mv.visitInsn(ALOAD_0);
        } else {
            loadVar(mv, TOBJECT, methodWeaver.getFiberVar());
            mv.visitMethodInsn(INVOKEVIRTUAL, FIBER_CLASS, "getCallee", "()Ljava/lang/Object;");
            mv.visitTypeInsn(CHECKCAST, getReceiverTypename());
        }
        spos++;
    }

    int len = f.getStackLen();
    // fill rest of stack with dummy args
    for (; spos < len; spos++) {
        Value v = f.getStack(spos);
        int vmt = VMType.toVmType(v.getTypeDesc());
        mv.visitInsn(VMType.constInsn[vmt]);
    }

    mv.visitJumpInsn(GOTO, callLabel);
}