[BOLT]How to add a Global Symbol in BOLT Pass

[wuwen03]

When writing a BOLT Pass, I have to add some data in data section and create a Symbol which references the data. Then I will use the Symbol to generate some MCInst. I code it as bellow:

        uint8_t *array = new uint8_t [1024];
        auto &Section = BC.registerOrUpdateSection("MyData", ELF::SHT_PROGBITS, BinarySection::getFlags(false,false,true),array,1024);
        array[0] = 1;//generate some data in the Section
        Section.setOutputAddress(/*I don't know*/);
        Section.setOutputFileOffset(/*"I don't know"*/);
        int SymbolAddress;/*I don't know*/
        BC.getOrCreateGlobalSymbol(SymbolAddress, "DATAAt",8);

However, the Symbol must be given a specific Address which is corresponding to the Section OutputAddress. However, the OutputAddress and OutputFileOffset is defined after all the BOLT PASSes, so I can't get the information inside my BOLT PASS, and I failed to define them by myself.
Is there any way to handle it?