How can I make a label begin with a dot

As we know, a dot preceding a name is either an assembler directive or a local label. When I use my own LLVM backend to emit assembler, I find that all the labels are missing a preceding dot, which is different from other LLVM backends. Here are snippets.

.LBB1_2
    nop
    ba .LBB1_1
    nop
.LBB1_1:                                ! %if.then
    ld [%fp+-8], %i0
    add %i0, 1, %i0
    call test
    st %i0, [%fp+-8]
    ba .LBB1_2
    nop
.LBB1_2:                                ! %if.end
    ld [%fp+-8], %i0
    ret

mine is below:

JLT LBB1_2
    JMP LBB1_1
LBB1_1:                                 # %if.then
    LD.w r5, [sp]
    ADD r5, r5, #1
    ST.w [sp], r5
    LD r5, #test
    LJMP r5
    JMP LBB1_2
LBB1_2:                                 # %if.end
    LD.w r0, [sp]
    ADD sp, #8
    JMP lr

I have no idea what's going on and which part of my backend should be modified.

Solution

You'd need to specify PrivateLabelPrefix in your target's MCAsmInfo subclass. Note that PrivateLabelPrefix is set to .L by default for all ELF targets.