jodd-proxetta/src/main/java/jodd/asm7/Label.java
final boolean resolve(final byte[] code, final int bytecodeOffset) {
    this.flags |= FLAG_RESOLVED;
    this.bytecodeOffset = bytecodeOffset;
    if (forwardReferences == null) {
      return false;
    }
    boolean hasAsmInstructions = false;
    for (int i = forwardReferences[0]; i > 0; i -= 2) {
      final int sourceInsnBytecodeOffset = forwardReferences[i - 1];
      final int reference = forwardReferences[i];
      final int relativeOffset = bytecodeOffset - sourceInsnBytecodeOffset;
      int handle = reference & FORWARD_REFERENCE_HANDLE_MASK;
      if ((reference & FORWARD_REFERENCE_TYPE_MASK) == FORWARD_REFERENCE_TYPE_SHORT) {
        if (relativeOffset < Short.MIN_VALUE || relativeOffset > Short.MAX_VALUE) {
          // Change the opcode of the jump instruction, in order to be able to find it later in
          // ClassReader. These ASM specific opcodes are similar to jump instruction opcodes, except
          // that the 2 bytes offset is unsigned (and can therefore represent values from 0 to
          // 65535, which is sufficient since the size of a method is limited to 65535 bytes).
          int opcode = code[sourceInsnBytecodeOffset] & 0xFF;
          if (opcode < Opcodes.IFNULL) {
            // Change IFEQ ... JSR to ASM_IFEQ ... ASM_JSR.
            code[sourceInsnBytecodeOffset] = (byte) (opcode + Constants.ASM_OPCODE_DELTA);
          } else {
            // Change IFNULL and IFNONNULL to ASM_IFNULL and ASM_IFNONNULL.
            code[sourceInsnBytecodeOffset] = (byte) (opcode + Constants.ASM_IFNULL_OPCODE_DELTA);
          }
          hasAsmInstructions = true;
        }
        code[handle++] = (byte) (relativeOffset >>> 8);
        code[handle] = (byte) relativeOffset;
      } else {
        code[handle++] = (byte) (relativeOffset >>> 24);
        code[handle++] = (byte) (relativeOffset >>> 16);
        code[handle++] = (byte) (relativeOffset >>> 8);
        code[handle] = (byte) relativeOffset;
      }
    }
    return hasAsmInstructions;
  }
final boolean resolve(final byte[] code, final int bytecodeOffset) {
    this.flags |= FLAG_RESOLVED;
    this.bytecodeOffset = bytecodeOffset;
    if (forwardReferences == null) {
      return false;
    }
    boolean hasAsmInstructions = false;
    for (int i = forwardReferences[0]; i > 0; i -= 2) {
      final int sourceInsnBytecodeOffset = forwardReferences[i - 1];
      final int reference = forwardReferences[i];
      final int relativeOffset = bytecodeOffset - sourceInsnBytecodeOffset;
      int handle = reference & FORWARD_REFERENCE_HANDLE_MASK;
      if ((reference & FORWARD_REFERENCE_TYPE_MASK) == FORWARD_REFERENCE_TYPE_SHORT) {
        if (relativeOffset < Short.MIN_VALUE || relativeOffset > Short.MAX_VALUE) {
          // Change the opcode of the jump instruction, in order to be able to find it later in
          // ClassReader. These ASM specific opcodes are similar to jump instruction opcodes, except
          // that the 2 bytes offset is unsigned (and can therefore represent values from 0 to
          // 65535, which is sufficient since the size of a method is limited to 65535 bytes).
          int opcode = code[sourceInsnBytecodeOffset] & 0xFF;
          if (opcode < Opcodes.IFNULL) {
            // Change IFEQ ... JSR to ASM_IFEQ ... ASM_JSR.
            code[sourceInsnBytecodeOffset] = (byte) (opcode + Constants.ASM_OPCODE_DELTA);
          } else {
            // Change IFNULL and IFNONNULL to ASM_IFNULL and ASM_IFNONNULL.
            code[sourceInsnBytecodeOffset] = (byte) (opcode + Constants.ASM_IFNULL_OPCODE_DELTA);
          }
          hasAsmInstructions = true;
        }
        code[handle++] = (byte) (relativeOffset >>> 8);
        code[handle] = (byte) relativeOffset;
      } else {
        code[handle++] = (byte) (relativeOffset >>> 24);
        code[handle++] = (byte) (relativeOffset >>> 16);
        code[handle++] = (byte) (relativeOffset >>> 8);
        code[handle] = (byte) relativeOffset;
      }
    }
    return hasAsmInstructions;
  }
Sets the bytecode offset of this label to the given value and resolves the forward references
to this label, if any. This method must be called when this label is added to the bytecode of
the method, i.e. when its bytecode offset becomes known. This method fills in the blanks that
where left in the bytecode by each forward reference previously added to this label.

@param code the bytecode of the method.
@param bytecodeOffset the bytecode offset of this label.
@return {@literal true} if a blank that was left for this label was too small to store the
offset. In such a case the corresponding jump instruction is replaced with an equivalent
ASM specific instruction using an unsigned two bytes offset. These ASM specific
instructions are later replaced with standard bytecode instructions with wider offsets (4
bytes instead of 2), in ClassReader.