compute it based on what it knows.  As part of this, rename getSectionForMergeableConstant
to getSectionForConstant because it works for non-mergable constants also.

The only functionality change from this is that Xcore will start dropping
its jump tables into readonly section instead of data section in -static mode.
This should be fine as the linker resolves the relocations.  If this is a
problem, let me know and we'll come up with another solution.

llvm-svn: 77833

llvm-svn: 77820

thing is #if0'd out anyway.  Just simplify the code by reducing the interface.
Not deleting this is essential for Bill's continuing happiness.

llvm-svn: 77736

it is highly specific to the object file that will be generated in the end,
this introduces a new TargetLoweringObjectFile interface that is implemented
for each of ELF/MachO/COFF/Alpha/PIC16 and XCore.

Though still is still a brutal and ugly refactoring, this is a major step
towards goodness.

This patch also:
1. fixes a bunch of dangling pointer problems in the PIC16 backend.
2. disables the TargetLowering copy ctor which PIC16 was accidentally using.
3. gets us closer to xcore having its own crazy target section flags and
   pic16 not having to shadow sections with its own objects.
4. fixes wierdness where ELF targets would set CStringSection but not
   CStringSection_.  Factor the code better.
5. fixes some bugs in string lowering on ELF targets.

llvm-svn: 77294

implementations that need it, rearrange ELFTAI.

llvm-svn: 77236

not in mergable

llvm-svn: 77210

llvm-svn: 77203

instead.

llvm-svn: 77186

instead and drive things based off of that.

llvm-svn: 77184

'unnamed' bss section, but some impls would want a named one.  Since
they don't have consistent behavior, just make each target do their
own thing, instead of doing something "sortof common" then having
targets change immutable objects later.

llvm-svn: 77165

just use a smallstring instead.

llvm-svn: 77144

llvm-svn: 77143

section specified for it or not.

llvm-svn: 77142

to its classification.

llvm-svn: 77140

llvm-svn: 77138

llvm-svn: 77135

llvm-svn: 77134

simplify targets.

llvm-svn: 77132

putting readonly constants in the readonly section if we have one.

llvm-svn: 77131

group instead of a bunch of random unrelated ideas.  Provide predicates
to categorize a SectionKind into a group, and use them instead of 
getKind() throughout the code.

This also renames a ton of SectionKinds to be more consistent and
evocative, and adds a huge number of comments on the enums so that
I will hopefully be able to remember how this stuff works long from
now.

llvm-svn: 77129

an enum.

llvm-svn: 77096

1. Spell SectionFlags::Writeable as "Writable".
2. Add predicates for deriving SectionFlags from SectionKinds.
3. Sink ELF-specific getSectionPrefixForUniqueGlobal impl into
   ELFTargetAsmInfo.
4. Fix SectionFlagsForGlobal to know that BSS/ThreadBSS has the
   BSS bit set (the real fix for PR4619).
5. Fix isSuitableForBSS to not put globals with explicit sections
   set in BSS (which was the reason #4 wasn't fixed earlier).
6. Remove my previous hack for PR4619.

llvm-svn: 77085

llvm-svn: 77084

Thanks to Rafael for the great example.

llvm-svn: 77083

llvm-svn: 76999

previously virtual) function to being a static function
in the .cpp file.

llvm-svn: 76997

It's classifications now include elf-specific discriminators.  Targets
that don't have these features (like darwin and pecoff) simply treat
data.rel like data, etc.

llvm-svn: 76993

pass it in instead of recomputing it.

llvm-svn: 76990

llvm-svn: 76989

llvm-svn: 76976

llvm-svn: 76975

into its own helper function.

llvm-svn: 76974

virtual one.

llvm-svn: 76973

llvm-svn: 76972

when we have a global with no section explicitly specified.

llvm-svn: 76971

llvm-svn: 76967

implementation, eliminating a dupe.

llvm-svn: 76953

The later doesn't depend on any crazy LLVM IR stuff, and this
pulls the concatenation of prefix with GV name (the root problem behind
PR4584) out one level.

llvm-svn: 76948

llvm-svn: 76941

llvm-svn: 76937