Java Code Examples for jdk.internal.org.objectweb.asm.MethodVisitor#visitInsn()

private void emitStaticInitializer() {
    final String className = scriptClassInfo.getJavaName();
    if (! staticInitFound) {
        // no user written <clinit> and so create one
        final MethodVisitor mv = ClassGenerator.makeStaticInitializer(this);
        mv.visitCode();
        mv.visitInsn(RETURN);
        mv.visitMaxs(Short.MAX_VALUE, 0);
        mv.visitEnd();
    }
    // Now generate $clinit$
    final MethodGenerator mi = ClassGenerator.makeStaticInitializer(this, $CLINIT$);
    ClassGenerator.emitStaticInitPrefix(mi, className, memberCount);
    if (memberCount > 0) {
        for (final MemberInfo memInfo : scriptClassInfo.getMembers()) {
            if (memInfo.isInstanceProperty() || memInfo.isInstanceFunction()) {
                ClassGenerator.linkerAddGetterSetter(mi, className, memInfo);
            } else if (memInfo.isInstanceGetter()) {
                final MemberInfo setter = scriptClassInfo.findSetter(memInfo);
                ClassGenerator.linkerAddGetterSetter(mi, className, memInfo, setter);
            }
        }
    }
    ClassGenerator.emitStaticInitSuffix(mi, className);
}
 

@Override
public Type ldc(final MethodVisitor method, final Object c) {
    if (c == null) {
        method.visitInsn(ACONST_NULL);
    } else if (c instanceof Undefined) {
        return loadUndefined(method);
    } else if (c instanceof String) {
        method.visitLdcInsn(c);
        return STRING;
    } else if (c instanceof Handle) {
        method.visitLdcInsn(c);
        return Type.typeFor(MethodHandle.class);
    } else {
        throw new UnsupportedOperationException("implementation missing for class " + c.getClass() + " value=" + c);
    }

    return Type.OBJECT;
}
 

void defineIndyCallingClass(ClassWriter cw) {
    cw.visit(52, ACC_SUPER | ACC_PUBLIC, INDY_CALLER_CLASS_NAME, null, "java/lang/Object", null);
    MethodVisitor mv = cw.visitMethod(ACC_PUBLIC | ACC_STATIC, "invoke", "()V", null, null);
    mv.visitCode();
    Handle h = new Handle(H_INVOKESTATIC,
                          BOOTSTRAP_METHOD_CLASS_NAME, BOOTSTRAP_METHOD_NAME,
                          BOOTSTRAP_METHOD_DESC, false);
    mv.visitInvokeDynamicInsn(BOOTSTRAP_METHOD_CLASS_NAME, "()V", h);
    mv.visitInsn(RETURN);
    mv.visitMaxs(0, 0);
    mv.visitEnd();
    cw.visitEnd();
}
 

public static byte[] dumpClassFile(int cfv, int testDimension264, String arrayDim) throws Exception {
    ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
    MethodVisitor mv;

    classCName = "classCName_" + cfv + "_" + testDimension264;

    cw.visit(cfv, ACC_PUBLIC + ACC_SUPER, classCName, null, "java/lang/Object", null);
    {
        mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
        mv.visitInsn(RETURN);
        mv.visitMaxs(1, 1);
        mv.visitEnd();
    }
    {   // classCName main method
        mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "main", "([Ljava/lang/String;)V", null, null);
        mv.visitCode();
        mv.visitIntInsn(BIPUSH, 1);
        mv.visitTypeInsn(ANEWARRAY, arrayDim); // Test ANEWARRAY bytecode with various dimensions
        mv.visitInsn(RETURN);
        mv.visitMaxs(2, 2);
        mv.visitEnd();
    }
    cw.visitEnd();
    return cw.toByteArray();
}
 

@Override
public Type mul(final MethodVisitor method, final int programPoint) {
    if(programPoint == INVALID_PROGRAM_POINT) {
        method.visitInsn(IMUL);
    } else {
        method.visitInvokeDynamicInsn("imul", "(II)I", MATHBOOTSTRAP, programPoint);
    }
    return INT;
}
 

@Override
public Type neg(final MethodVisitor method, final int programPoint) {
    if(programPoint == INVALID_PROGRAM_POINT) {
        method.visitInsn(INEG);
    } else {
        method.visitInvokeDynamicInsn("ineg", "(I)I", MATHBOOTSTRAP, programPoint);
    }
    return INT;
}
 

@Override
public Type mul(final MethodVisitor method) {
    method.visitInsn(LMUL);
    return LONG;
}
 

@Override
public Type sub(final MethodVisitor method) {
    method.visitInsn(ISUB);
    return INT;
}
 

@Override
public Type sub(final MethodVisitor method) {
    method.visitInsn(LSUB);
    return LONG;
}
 

@Override
public Type div(final MethodVisitor method) {
    method.visitInsn(IDIV);
    return INT;
}
 

/**
 * Generate the static initializer method for the proxy class.
 */
private void generateStaticInitializer() {

    MethodVisitor mv = visitMethod(Modifier.STATIC, NAME_CLINIT,
            "()V", null, null);
    mv.visitCode();
    Label L_startBlock = new Label();
    Label L_endBlock = new Label();
    Label L_NoMethodHandler = new Label();
    Label L_NoClassHandler = new Label();

    mv.visitTryCatchBlock(L_startBlock, L_endBlock, L_NoMethodHandler,
            JL_NO_SUCH_METHOD_EX);
    mv.visitTryCatchBlock(L_startBlock, L_endBlock, L_NoClassHandler,
            JL_CLASS_NOT_FOUND_EX);

    mv.visitLabel(L_startBlock);
    for (List<ProxyMethod> sigmethods : proxyMethods.values()) {
        for (ProxyMethod pm : sigmethods) {
            pm.codeFieldInitialization(mv, className);
        }
    }
    mv.visitInsn(RETURN);
    mv.visitLabel(L_endBlock);
    // Generate exception handler

    mv.visitLabel(L_NoMethodHandler);
    mv.visitVarInsn(ASTORE, 1);
    mv.visitTypeInsn(Opcodes.NEW, JL_NO_SUCH_METHOD_ERROR);
    mv.visitInsn(DUP);
    mv.visitVarInsn(ALOAD, 1);
    mv.visitMethodInsn(INVOKEVIRTUAL, JL_THROWABLE,
            "getMessage", "()Ljava/lang/String;", false);
    mv.visitMethodInsn(INVOKESPECIAL, JL_NO_SUCH_METHOD_ERROR,
            "<init>", "(Ljava/lang/String;)V", false);
    mv.visitInsn(ATHROW);

    mv.visitLabel(L_NoClassHandler);
    mv.visitVarInsn(ASTORE, 1);
    mv.visitTypeInsn(Opcodes.NEW, JL_NO_CLASS_DEF_FOUND_ERROR);
    mv.visitInsn(DUP);
    mv.visitVarInsn(ALOAD, 1);
    mv.visitMethodInsn(INVOKEVIRTUAL, JL_THROWABLE,
            "getMessage", "()Ljava/lang/String;", false);
    mv.visitMethodInsn(INVOKESPECIAL, JL_NO_CLASS_DEF_FOUND_ERROR,
            "<init>", "(Ljava/lang/String;)V", false);
    mv.visitInsn(ATHROW);

    // Maxs computed by ClassWriter.COMPUTE_FRAMES, these arguments ignored
    mv.visitMaxs(-1, -1);
    mv.visitEnd();
}
 

@Override
public Type aload(final MethodVisitor method) {
    method.visitInsn(IALOAD);
    return INT;
}
 

@Override
public Type loadForcedInitializer(final MethodVisitor method) {
    method.visitInsn(ICONST_0);
    return BOOLEAN;
}
 

@Override
public Type neg(final MethodVisitor method) {
    method.visitInsn(DNEG);
    return NUMBER;
}
 

@Override
public void astore(final MethodVisitor method) {
    method.visitInsn(IASTORE);
}
 

@Override
public Type or(final MethodVisitor method) {
    method.visitInsn(IOR);
    return INT;
}
 

/**
 * Returns the bytes for a class with name d_name (presumably "D" in some
 * package), extending some class with name sub_what, implementing p.I,
 * and defining two methods m() and m(11args) with access method_acc.
 *
 * @param d_name      Name of class that is defined
 * @param sub_what    Name of class that it extends
 * @param method_acc  Accessibility of method(s) m in defined class.
 * @return
 * @throws Exception
 */
public static byte[] bytesForSomeDsubSomethingSomeAccess
        (String d_name, String sub_what, int method_acc)
        throws Exception {

    ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES
            | ClassWriter.COMPUTE_MAXS);
    MethodVisitor mv;
    String[] interfaces = {"p/I"};

    cw.visit(V1_8, ACC_PUBLIC + ACC_SUPER, d_name, null, sub_what, interfaces);
    {
        mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKESPECIAL, sub_what, "<init>", "()V");
        mv.visitInsn(RETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }
    // int m() {return 3;}
    {
        mv = cw.visitMethod(method_acc, "m", "()I", null, null);
        mv.visitCode();
        mv.visitLdcInsn(new Integer(3));
        mv.visitInsn(IRETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }
    // int m(11args) {return 3;}
    {
        mv = cw.visitMethod(method_acc, "m", "(BCSIJ"
                + "Ljava/lang/Object;"
                + "Ljava/lang/Object;"
                + "Ljava/lang/Object;"
                + "Ljava/lang/Object;"
                + "Ljava/lang/Object;"
                + "Ljava/lang/Object;"
                + ")I", null, null);
        mv.visitCode();
        mv.visitLdcInsn(new Integer(3));
        mv.visitInsn(IRETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }
    cw.visitEnd();
    return cw.toByteArray();
}
 

@Override
public Type rem(final MethodVisitor method, final int programPoint) {
    method.visitInsn(DREM);
    return NUMBER;
}
 

/**
 * Superclass logic for pop for all types
 *
 * @param method method emitter
 * @param type   type to pop
 */
protected static void pop(final MethodVisitor method, final Type type) {
    method.visitInsn(type.isCategory2() ? POP2 : POP);
}
 

/**
 * Superclass logic for pop for all types
 *
 * @param method method emitter
 * @param type   type to pop
 */
protected static void pop(final MethodVisitor method, final Type type) {
    method.visitInsn(type.isCategory2() ? POP2 : POP);
}