Java Opcodes.ACC_ABSTRACT属性代码示例

/**
 * Checks that the given access flags do not contain invalid flags. This
 * method also checks that mutually incompatible flags are not set
 * simultaneously.
 * 
 * @param access
 *            the access flags to be checked
 * @param possibleAccess
 *            the valid access flags.
 */
static void checkAccess(final int access, final int possibleAccess) {
    if ((access & ~possibleAccess) != 0) {
        throw new IllegalArgumentException("Invalid access flags: "
                + access);
    }
    int pub = (access & Opcodes.ACC_PUBLIC) == 0 ? 0 : 1;
    int pri = (access & Opcodes.ACC_PRIVATE) == 0 ? 0 : 1;
    int pro = (access & Opcodes.ACC_PROTECTED) == 0 ? 0 : 1;
    if (pub + pri + pro > 1) {
        throw new IllegalArgumentException(
                "public private and protected are mutually exclusive: "
                        + access);
    }
    int fin = (access & Opcodes.ACC_FINAL) == 0 ? 0 : 1;
    int abs = (access & Opcodes.ACC_ABSTRACT) == 0 ? 0 : 1;
    if (fin + abs > 1) {
        throw new IllegalArgumentException(
                "final and abstract are mutually exclusive: " + access);
    }
}
 

@Override
public MethodVisitor visitMethod(final int access, final String name,
        final String desc, final String signature, final String[] exceptions) {
    if (computeSVUID) {
        if ("<clinit>".equals(name)) {
            hasStaticInitializer = true;
        }
        /*
         * Remembers non private constructors and methods for SVUID
         * computation For constructor and method modifiers, only the
         * ACC_PUBLIC, ACC_PRIVATE, ACC_PROTECTED, ACC_STATIC, ACC_FINAL,
         * ACC_SYNCHRONIZED, ACC_NATIVE, ACC_ABSTRACT and ACC_STRICT flags
         * are used.
         */
        int mods = access
                & (Opcodes.ACC_PUBLIC | Opcodes.ACC_PRIVATE
                        | Opcodes.ACC_PROTECTED | Opcodes.ACC_STATIC
                        | Opcodes.ACC_FINAL | Opcodes.ACC_SYNCHRONIZED
                        | Opcodes.ACC_NATIVE | Opcodes.ACC_ABSTRACT | Opcodes.ACC_STRICT);

        // all non private methods
        if ((access & Opcodes.ACC_PRIVATE) == 0) {
            if ("<init>".equals(name)) {
                svuidConstructors.add(new Item(name, mods, desc));
            } else if (!"<clinit>".equals(name)) {
                svuidMethods.add(new Item(name, mods, desc));
            }
        }
    }

    return super.visitMethod(access, name, desc, signature, exceptions);
}
 

/**
 * Marks the end of the visited method.
 */
public void endMethod() {
    if ((access & Opcodes.ACC_ABSTRACT) == 0) {
        mv.visitMaxs(0, 0);
    }
    mv.visitEnd();
}
 

@Override
public void visitCode() {
    if ((access & Opcodes.ACC_ABSTRACT) != 0) {
        throw new RuntimeException("Abstract methods cannot have code");
    }
    startCode = true;
    super.visitCode();
}
 

/**
 * Constructs a new {@link MethodNode}.
 * 
 * @param api
 *            the ASM API version implemented by this visitor. Must be one
 *            of {@link Opcodes#ASM4} or {@link Opcodes#ASM5}.
 * @param access
 *            the method's access flags (see {@link Opcodes}). This
 *            parameter also indicates if the method is synthetic and/or
 *            deprecated.
 * @param name
 *            the method's name.
 * @param desc
 *            the method's descriptor (see {@link Type}).
 * @param signature
 *            the method's signature. May be <tt>null</tt>.
 * @param exceptions
 *            the internal names of the method's exception classes (see
 *            {@link Type#getInternalName() getInternalName}). May be
 *            <tt>null</tt>.
 */
public MethodNode(final int api, final int access, final String name,
        final String desc, final String signature, final String[] exceptions) {
    super(api);
    this.access = access;
    this.name = name;
    this.desc = desc;
    this.signature = signature;
    this.exceptions = new ArrayList<String>(exceptions == null ? 0
            : exceptions.length);
    boolean isAbstract = (access & Opcodes.ACC_ABSTRACT) != 0;
    if (!isAbstract) {
        this.localVariables = new ArrayList<LocalVariableNode>(5);
    }
    this.tryCatchBlocks = new ArrayList<TryCatchBlockNode>();
    if (exceptions != null) {
        this.exceptions.addAll(Arrays.asList(exceptions));
    }
    this.instructions = new InsnList();
}
 

static void appendAccess(final int access, final StringBuilder sb) {
    if ((access & Opcodes.ACC_PUBLIC) != 0) {
        sb.append("public ");
    }
    if ((access & Opcodes.ACC_PRIVATE) != 0) {
        sb.append("private ");
    }
    if ((access & Opcodes.ACC_PROTECTED) != 0) {
        sb.append("protected ");
    }
    if ((access & Opcodes.ACC_FINAL) != 0) {
        sb.append("final ");
    }
    if ((access & Opcodes.ACC_STATIC) != 0) {
        sb.append("static ");
    }
    if ((access & Opcodes.ACC_SUPER) != 0) {
        if ((access & ACCESS_CLASS) == 0) {
            sb.append("synchronized ");
        } else {
            sb.append("super ");
        }
    }
    if ((access & Opcodes.ACC_VOLATILE) != 0) {
        if ((access & ACCESS_FIELD) == 0) {
            sb.append("bridge ");
        } else {
            sb.append("volatile ");
        }
    }
    if ((access & Opcodes.ACC_TRANSIENT) != 0) {
        if ((access & ACCESS_FIELD) == 0) {
            sb.append("varargs ");
        } else {
            sb.append("transient ");
        }
    }
    if ((access & Opcodes.ACC_NATIVE) != 0) {
        sb.append("native ");
    }
    if ((access & Opcodes.ACC_STRICT) != 0) {
        sb.append("strict ");
    }
    if ((access & Opcodes.ACC_INTERFACE) != 0) {
        sb.append("interface ");
    }
    if ((access & Opcodes.ACC_ABSTRACT) != 0) {
        sb.append("abstract ");
    }
    if ((access & Opcodes.ACC_SYNTHETIC) != 0) {
        sb.append("synthetic ");
    }
    if ((access & Opcodes.ACC_ANNOTATION) != 0) {
        sb.append("annotation ");
    }
    if ((access & Opcodes.ACC_ENUM) != 0) {
        sb.append("enum ");
    }
    if ((access & Opcodes.ACC_DEPRECATED) != 0) {
        sb.append("deprecated ");
    }
    if ((access & Opcodes.ACC_MANDATED) != 0) {
        sb.append("mandated ");
    }
}
 

@Override
public final void visitCode() {
    if ((access & (Opcodes.ACC_ABSTRACT | Opcodes.ACC_INTERFACE | Opcodes.ACC_NATIVE)) == 0) {
        sa.addStart("code", new AttributesImpl());
    }
}
 

@Override
public Textifier visitMethod(final int access, final String name,
        final String desc, final String signature, final String[] exceptions) {
    buf.setLength(0);
    buf.append('\n');
    if ((access & Opcodes.ACC_DEPRECATED) != 0) {
        buf.append(tab).append("// DEPRECATED\n");
    }
    buf.append(tab).append("// access flags 0x")
            .append(Integer.toHexString(access).toUpperCase()).append('\n');

    if (signature != null) {
        buf.append(tab);
        appendDescriptor(METHOD_SIGNATURE, signature);

        TraceSignatureVisitor v = new TraceSignatureVisitor(0);
        SignatureReader r = new SignatureReader(signature);
        r.accept(v);
        String genericDecl = v.getDeclaration();
        String genericReturn = v.getReturnType();
        String genericExceptions = v.getExceptions();

        buf.append(tab).append("// declaration: ").append(genericReturn)
                .append(' ').append(name).append(genericDecl);
        if (genericExceptions != null) {
            buf.append(" throws ").append(genericExceptions);
        }
        buf.append('\n');
    }

    buf.append(tab);
    appendAccess(access & ~Opcodes.ACC_VOLATILE);
    if ((access & Opcodes.ACC_NATIVE) != 0) {
        buf.append("native ");
    }
    if ((access & Opcodes.ACC_VARARGS) != 0) {
        buf.append("varargs ");
    }
    if ((access & Opcodes.ACC_BRIDGE) != 0) {
        buf.append("bridge ");
    }
    if ((this.access & Opcodes.ACC_INTERFACE) != 0
            && (access & Opcodes.ACC_ABSTRACT) == 0
            && (access & Opcodes.ACC_STATIC) == 0) {
        buf.append("default ");
    }

    buf.append(name);
    appendDescriptor(METHOD_DESCRIPTOR, desc);
    if (exceptions != null && exceptions.length > 0) {
        buf.append(" throws ");
        for (int i = 0; i < exceptions.length; ++i) {
            appendDescriptor(INTERNAL_NAME, exceptions[i]);
            buf.append(' ');
        }
    }

    buf.append('\n');
    text.add(buf.toString());

    Textifier t = createTextifier();
    text.add(t.getText());
    return t;
}
 

/**
 * Appends a string representation of the given access modifiers to
 * {@link #buf buf}.
 *
 * @param access
 *            some access modifiers.
 */
private void appendAccess(final int access) {
    if ((access & Opcodes.ACC_PUBLIC) != 0) {
        buf.append("public ");
    }
    if ((access & Opcodes.ACC_PRIVATE) != 0) {
        buf.append("private ");
    }
    if ((access & Opcodes.ACC_PROTECTED) != 0) {
        buf.append("protected ");
    }
    if ((access & Opcodes.ACC_FINAL) != 0) {
        buf.append("final ");
    }
    if ((access & Opcodes.ACC_STATIC) != 0) {
        buf.append("static ");
    }
    if ((access & Opcodes.ACC_SYNCHRONIZED) != 0) {
        buf.append("synchronized ");
    }
    if ((access & Opcodes.ACC_VOLATILE) != 0) {
        buf.append("volatile ");
    }
    if ((access & Opcodes.ACC_TRANSIENT) != 0) {
        buf.append("transient ");
    }
    if ((access & Opcodes.ACC_ABSTRACT) != 0) {
        buf.append("abstract ");
    }
    if ((access & Opcodes.ACC_STRICT) != 0) {
        buf.append("strictfp ");
    }
    if ((access & Opcodes.ACC_SYNTHETIC) != 0) {
        buf.append("synthetic ");
    }
    if ((access & Opcodes.ACC_MANDATED) != 0) {
        buf.append("mandated ");
    }
    if ((access & Opcodes.ACC_ENUM) != 0) {
        buf.append("enum ");
    }
}