Advice on __emit__ intrinsic

Clang Frontend
1

I'm working on adding codegen support for the BCC __emit__ intrinsic:

  __emit__ - RAD Studio

Essentially, it allows you to insert a sequence of bytes verbatim to
the object file.

  __emit__(0xCC);

would be equivalent to:

  asm(".byte 0xCC");

The documentation doesn't seem to mention it, but it also allows you
to emit the address of a variable:

  __emit__(&x);

Because of this I figure I need to add support for this on the llvm
level, but I'm not sure how to go about it. If anyone has any advice I
would appreciate it.

Thanks,

2

I'm not sure that this needs anything extra in LLVM. The first form, as you say, is already supported by trivial inline ASM. The second looks like it's equivalent to:

asm ("$0" : : "m"(&x))

(I think - my GNU inline asm syntax knowledge is slightly rusty)

David

-- Sent from my Apple II

3

Although that does expand to something, the result isn't something
that can be assembled:

  -8(%rsp)

Doing something like:

  .long -8(%rsp)

doesn't work either. I guess it needed to expand to just ".long -8".
Any more ideas? Any help would be appreciated!