This reverts commit r193479.

The atoms are already added to the file, so re-adding them caused the YAML
writer to write the same atoms twice. That made the YAML reader to fail with
"duplicate atom name" error.

This is not the only error we've got for RoundTripYAMLPass for PECOFF, so we
cannot enable the test yet. More fixes will come.

Differential Revision: http://llvm-reviews.chandlerc.com/D2069

llvm-svn: 193762

llvm-svn: 193712

llvm-svn: 193662

llvm-svn: 193646

llvm-svn: 193588

llvm-svn: 193586

Enable this for the following flavors

a) core
b) gnu
c) darwin

Its disabled for the flavor PECOFF. Convenient markers are added with FIXME
comments in the Driver that would be removed and code removed from each flavor.

llvm-svn: 193585

llvm-svn: 193584

__ImageBase is an absolute symbol whose address is the same as the image base
address. What we did before this patch was to create __ImageBase symbol as a
symbol whose *contents* (not location) is the image base address, which is
clearly wrong.

llvm-svn: 193565

llvm-svn: 193557

This change has no effect now, but will be needed to emit BSS atoms
to .bss section.

llvm-svn: 193556

llvm-svn: 193551

intended for debugging and diagnostic output), just inspect the spelling
to check for specific prefixes in drectve section flags.

In addition to being significantly cheaper and not relying on
a debugging interface, this also avoids creating a temporary string and
binding it to StringRef variable. We then went on to access it after the
memory had been deallocated.

This bug too was caught by ASan. I love ASan so much. =]

llvm-svn: 193487

More important than any performance concerns, the code was dropping the
temporary string on the floor after assigning it to a StringRef, and
then used the StringRef later. Caught by running the LLD tests under
ASan.

llvm-svn: 193486

llvm-svn: 193483

llvm-svn: 193482

llvm-svn: 193481

llvm-svn: 193480

llvm-svn: 193479

llvm-svn: 193478

llvm-svn: 193477

On discussing this with Nick, it looks like the StubAtoms
that contain a lazyImmediate reference kind should be null
and the location needs to be fixed up later with some value
that is an offset into the __LINKEDIT segment.

The drawback is that it allows yaml files with references
that expect a target to be considered without one.

This results in bad yaml files that would need to be handled
in the YAML Reader.

Inorder to fix this, the Stub Atoms use a dummy target such
as itself.

llvm-svn: 193476

/merge:<from>=<to> option makes the linker to combine "from" section to "to"
section. This patch is to parse the option. The actual feature will be
implemented in a subsequent patch.

llvm-svn: 193454

llvm-svn: 193451

llvm-svn: 193446

We really need a test for the manifest file output, but because it depends
on external commands (CVTRES.EXE and RC.EXE), it's not very easy to write it.

llvm-svn: 193445

llvm-svn: 193444

The internal byte array of the SmallString filled by createTemporaryFile() is
not guaranteed to be NUL-terminated. We need to call c_str() to handle it
safely.

llvm-svn: 193442

llvm-svn: 193440

llvm-svn: 193435

llvm-svn: 193424

llvm-svn: 193387

llvm-svn: 193385

llvm-svn: 193384

This renames the GOTPLTPass to RelocationPass and refactors it to better
represent the different types of relocations.

llvm-svn: 193379

llvm-svn: 193375

llvm-svn: 193369

The patch have completely broken COFF port and disabled many tests.
This also reverts r193302 (comment fix).

llvm-svn: 193362

llvm-svn: 193302

Easier to add new options such as -version, and easy to parse.

Now displays a help message with -help

llvm-svn: 193301