r124468.  Patch by Rafael Avila de Espindola!

llvm-svn: 126297

better name and matches what is used in the MachO writer.

llvm-svn: 122443

foo = a - b
.long foo
instead of just
.long a - b

First, on darwin9 64 bits the assembler produces the wrong result. Second,
if "a" is the end of the section all darwin assemblers (9, 10 and mc) will not
consider a - b to be a constant but will if the dummy foo is created.

Split how we handle these cases. The first one is something MC should take care
of. The second one has to be handled by the caller.

llvm-svn: 120889

doing that if the target is darwin10 or newer.

This fixes
*) Direct object emission was producing objects without the workaround on
   darwin9.
*) Assembly printing was producing objects with the workaround on linux.

llvm-svn: 120866

llvm-svn: 120298

llvm-svn: 119816

and testing is easier.  A good example is the unknown-location.ll test that
now can just look for ".loc 1 0 0".  We also don't use a DW_LNE_set_address for
every address change anymore.

llvm-svn: 119613

llvm-svn: 114592

llvm-svn: 112830

This patch was developed on top of original patch by Artur Pietrek.

llvm-svn: 112678

.weak_def_can_be_hidden directive.  Chris pointed out that the MCAsmInfo.h/.cpp
chunks aren't needed for this until the compiler starts generating these.  And
when that happens it will be more convenient for it to be a bool than a const
char*.

llvm-svn: 107906

llvm-svn: 107886

llvm-svn: 107215

metadata types which should be marked as "weak", but which the linker will
remove upon final linkage. For example, the "objc_msgSend_fixup_alloc" symbol is
defined like this:

       .globl l_objc_msgSend_fixup_alloc
       .weak_definition l_objc_msgSend_fixup_alloc
       .section __DATA, __objc_msgrefs, coalesced
       .align 3
l_objc_msgSend_fixup_alloc:
        .quad   _objc_msgSend_fixup
        .quad   L_OBJC_METH_VAR_NAME_1

This is different from the "linker_private" linkage type, because it can't have
the metadata defined with ".weak_definition".

llvm-svn: 107205

llvm-svn: 104197

llvm-svn: 102594

which is really a property of the section being referenced.
Add a predicate to MCSection to replace it.

Yay for reduction in magic.

llvm-svn: 100367

and substitute false at the one call site.

llvm-svn: 100354

llvm-svn: 98384

semantic instead of syntactic.  This completes MCization of
darwin/x86[-64]!

llvm-svn: 98145

llvm-svn: 95378

Default HasSetDirective to true, since most targets have it.

The targets that claim to not have it probably do, or it is
spelled differently. These include Blackfin, Mips, Alpha, and
PIC16.  All of these except pic16 are normal ELF targets, so
they almost certainly have it.

llvm-svn: 94585

Original patch by Sandeep Patel and updated by me.

llvm-svn: 94582

that has it.

llvm-svn: 94581

make it clear what it is, instead of how it is used.

llvm-svn: 94448

llvm-svn: 94445

llvm-svn: 94413

llvm-svn: 94299

a .section.  Switch to it with SwitchSection.

However, I think that this directive should be safe on any ELF target.
If so, we should hoist it up out of the X86 and SystemZ targets.

llvm-svn: 94298

llvm-svn: 94295

llvm-svn: 94290

stomache MCAsmInfo having this, and I found a better solution to
this layering issue.

llvm-svn: 93985

I really want clients of the streamer to be able to say "emit this
64-bit integer" and have it get broken down right by the streamer.

I may change this in the future, we'll see how it works out.

llvm-svn: 93934

which we don't support anymore.

llvm-svn: 93886

.zerofill directive.  Streamerize its generation.

llvm-svn: 93868

llvm-svn: 93855

llvm-svn: 93852

darwin into common code.

llvm-svn: 93849

1. TargetLoweringObjectFileMachO should decide if something
   goes in zerofill instead of having every target do it.
2. TargetLoweringObjectFileMachO should assign said symbols to
   the right MCSection, the asmprinters should just emit to the
   right section.
3. Since all zerofill stuff goes through mcstreamer anymore,
   MAI can have a bool "haszerofill" instead of having the textual
   directive to emit.

llvm-svn: 93838

direct inclusion edge from System to Support.

llvm-svn: 85086