Update DebugInfo interface to use metadata, instead of special named llvm.dbg.... global variables, to encode debugging information in llvm IR. This is mostly a mechanical change that tests metadata support very well.

This change speeds up llvm-gcc by more then 6% at "-O0 -g" (measured by compiling InstructionCombining.cpp!)

llvm-svn: 79977

llvm-svn: 79836

llvm-svn: 79798

llvm-svn: 79797

llvm-svn: 79777

llvm-svn: 79763

llvm-svn: 79742

SmallString::c_str.

llvm-svn: 79456

llvm-svn: 79406

talk to the MCStreamer directly instead.

llvm-svn: 79405

Make various changes suggested by Chris.

llvm-svn: 79358

MCAsmStreamer.  Based on this, eliminate the current section from AsmPrinter.

While I'm at it, clean up the last of the horrible "switch to null section" stuff
and add an assert.  This change is in preparation for completely eliminating 
asmprinter::switchtosection.

llvm-svn: 79324

just remove the argument and replace it with 1.

llvm-svn: 79246

doing it directly.  This requires const'izing a bunch of stuff that
took sections, but this seems like the right semantic thing to do:
emitting a label to a section shouldn't mutate the MCSection object
itself, for example.

llvm-svn: 79227

llvm-svn: 79222

to print one instruction.

llvm-svn: 78985

llvm-svn: 78948

PrintUnmangledNameSafely.

llvm-svn: 78878

llvm-svn: 78838

the basic block label printing to check whether a block has a name
before printing a comment character and whitespace for it.

llvm-svn: 78830

that emitted unnecessary whitespace outside of VerboseAsm mode.

llvm-svn: 78828

"inlineasmstart/end" strings so that the contents of the directive
are separate from the comment character.  This lets elf targets
get #APP/#NOAPP for free even if they don't use "#" as the comment
character.  This also allows hoisting the darwin stuff up to the
shared TAI class.

llvm-svn: 78737

the code based on this and make it fall through better.

llvm-svn: 78708

Add support for printing loop structure information in asm comments.
This definitely slows down asm output so put it under an -asm-exuberant
flag.

This information is useful when doing static analysis of performance
issues.

llvm-svn: 78567

2. Move section switch printing to MCSection virtual method which takes a
   TAI.  This eliminates textual formatting stuff from TLOF.
3. Eliminate SwitchToSectionDirective, getSectionFlagsAsString, and 
   TLOFELF::AtIsCommentChar.

llvm-svn: 78510

A TAI hook is appropriate in this case because this is just an
asm syntax issue, not a semantic difference. TLOF should model
the semantics of the section.

llvm-svn: 78498

llvm-svn: 78432

llvm-svn: 78428

llvm-svn: 78416

Fix some column padding bugs, reorganize things as suggested by Chris
and eliminate complexity.  Yay!

llvm-svn: 78243

llvm-svn: 78242

llvm-svn: 78154

the masm backend.  If anyone cares about masm in the future,
we'll have semantic sections it can hang off of.

llvm-svn: 78096

eliminate IsInTextSection.

llvm-svn: 78017

llvm-svn: 78015

llvm-svn: 77984

llvm-svn: 77976

TAI.

llvm-svn: 77842

llvm-svn: 77834

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