Method readMethod

src/jvm/clojure/asm/ClassReader.java:1008–1280

Reads a JVMS method_info structure and makes the given visitor visit it. @param classVisitor the visitor that must visit the method. @param context information about the class being parsed. @param methodInfoOffset the start offset of the method_info structure. @return the offset of the first byte f

(
      final ClassVisitor classVisitor, final Context context, final int methodInfoOffset)

   * @return the offset of the first byte following the method_info structure.
   */
  private int readMethod(
      final ClassVisitor classVisitor, final Context context, final int methodInfoOffset) {
    char[] charBuffer = context.charBuffer;

    // Read the access_flags, name_index and descriptor_index fields.
    int currentOffset = methodInfoOffset;
    context.currentMethodAccessFlags = readUnsignedShort(currentOffset);
    context.currentMethodName = readUTF8(currentOffset + 2, charBuffer);
    context.currentMethodDescriptor = readUTF8(currentOffset + 4, charBuffer);
    currentOffset += 6;

    // Read the method attributes (the variables are ordered as in Section 4.7 of the JVMS).
    // Attribute offsets exclude the attribute_name_index and attribute_length fields.
    // - The offset of the Code attribute, or 0.
    int codeOffset = 0;
    // - The offset of the Exceptions attribute, or 0.
    int exceptionsOffset = 0;
    // - The strings corresponding to the Exceptions attribute, or null.
    String[] exceptions = null;
    // - Whether the method has a Synthetic attribute.
    boolean synthetic = false;
    // - The constant pool index contained in the Signature attribute, or 0.
    int signatureIndex = 0;
    // - The offset of the RuntimeVisibleAnnotations attribute, or 0.
    int runtimeVisibleAnnotationsOffset = 0;
    // - The offset of the RuntimeInvisibleAnnotations attribute, or 0.
    int runtimeInvisibleAnnotationsOffset = 0;
    // - The offset of the RuntimeVisibleParameterAnnotations attribute, or 0.
    int runtimeVisibleParameterAnnotationsOffset = 0;
    // - The offset of the RuntimeInvisibleParameterAnnotations attribute, or 0.
    int runtimeInvisibleParameterAnnotationsOffset = 0;
    // - The offset of the RuntimeVisibleTypeAnnotations attribute, or 0.
    int runtimeVisibleTypeAnnotationsOffset = 0;
    // - The offset of the RuntimeInvisibleTypeAnnotations attribute, or 0.
    int runtimeInvisibleTypeAnnotationsOffset = 0;
    // - The offset of the AnnotationDefault attribute, or 0.
    int annotationDefaultOffset = 0;
    // - The offset of the MethodParameters attribute, or 0.
    int methodParametersOffset = 0;
    // - The non standard attributes (linked with their {@link Attribute#nextAttribute} field).
    //   This list in the <i>reverse order</i> or their order in the ClassFile structure.
    Attribute attributes = null;

    int attributesCount = readUnsignedShort(currentOffset);
    currentOffset += 2;
    while (attributesCount-- > 0) {
      // Read the attribute_info's attribute_name and attribute_length fields.
      String attributeName = readUTF8(currentOffset, charBuffer);
      int attributeLength = readInt(currentOffset + 2);
      currentOffset += 6;
      // The tests are sorted in decreasing frequency order (based on frequencies observed on
      // typical classes).
      if (Constants.CODE.equals(attributeName)) {
        if ((context.parsingOptions & SKIP_CODE) == 0) {
          codeOffset = currentOffset;
        }
      } else if (Constants.EXCEPTIONS.equals(attributeName)) {
        exceptionsOffset = currentOffset;