[LLVMdev] [patch] Dwarf Debug info support for COFF object files

[Nathan Jeffords]

Hello All,

I have created a set of patches that get dwarf debugging support working for
the COFF object file. I also believe I have fixed what appears to be a bug
in how line info sections are referred to from the DW_TAG_compile_unit DIE.
I have run some basic tests, analyzed dumps of both the objects files and
the final executables, and run a test program against mingw-gdb and
everything looks to be in order.

Here is a short description of what the patches accomplish

die.patch:
  adds a new DIEValue type to represent a section relative label. (their was
already a type id specified so I provided a class modeled after DIELabel)

secrel-fixup.patch:
  creats a new target specific fixup type (reloc_coff_secrel32) to represent
COFF Section Relative relocations and updats the COFF object writer to write
it as COFF_IMAGE_REL_AMD64_SREL32

secrel-streamer.patch
  adds a new directive in the MCStreamer interface to allow the AsmPrinter
to emit a section relative label and provides implementations for all
existings Streamer (all but WinCOFF either forward or error on it)

secrel-dwarf.patch
  updates dwarf printing code to make use of the new directive & DIE value
where appropriate (this is where the bug fix is)

coff-debug.patch
  turns the dwarf output on in the X86/COFF AsmInfo classes

- Nathan
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