Many of Daniel's fixes.

I'm returning the number of bytes actually copied so that the client has some
warning when it reads past the end of the buffer.

I'm keeping the distinction between getByte() and getBytes() for now for
subclasses that use functions like ptrace() on Linux and only have a restricted
interface.  This makes their implementation easier, and subclasses can always
write a one-line implementation of readByte() that uses their custom
readBytes().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77225 91177308-0d34-0410-b5e6-96231b3b80d8

Cosmetic change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77222 91177308-0d34-0410-b5e6-96231b3b80d8

Clean up.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77221 91177308-0d34-0410-b5e6-96231b3b80d8

CMake configuration: find mkdtemp, mkstemp, mktemp.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77219 91177308-0d34-0410-b5e6-96231b3b80d8

Get rid of some more getOpcode calls.

This also fixes potential problems in ARMBaseInstrInfo routines not recognizing thumb1 instructions when 32-bit and 16-bit instructions mix.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77218 91177308-0d34-0410-b5e6-96231b3b80d8

Fix build.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77217 91177308-0d34-0410-b5e6-96231b3b80d8

Following discussion on llvm-dev ("proposed new rule for getelementptr"),
add a new "Pointer Aliasing Rules" section.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77216 91177308-0d34-0410-b5e6-96231b3b80d8

Remove duplicate entries while printing decls for external symbols.
Some libcall names are same, so they were getting printed twice.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77215 91177308-0d34-0410-b5e6-96231b3b80d8

CMake: make sure that the *.inc files for libSystem show up in the resulting
project.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77213 91177308-0d34-0410-b5e6-96231b3b80d8

add an explanatory comment about why we drop these in readonly and
not in mergable

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77210 91177308-0d34-0410-b5e6-96231b3b80d8

Do not seed mstadata into the value map.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77208 91177308-0d34-0410-b5e6-96231b3b80d8

make COFF work like ELF and macho, by splitting out into its own
header even though there is only one COFF target.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77204 91177308-0d34-0410-b5e6-96231b3b80d8

don't create default text/data sections for all targets.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77203 91177308-0d34-0410-b5e6-96231b3b80d8

Apparently alpha doesn't use ElfTargetAsmInfo (?)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77202 91177308-0d34-0410-b5e6-96231b3b80d8

Thumb-2 does not have RSC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77201 91177308-0d34-0410-b5e6-96231b3b80d8

Add ".w" suffix for wide thumb-2 instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77199 91177308-0d34-0410-b5e6-96231b3b80d8

inline a method.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77198 91177308-0d34-0410-b5e6-96231b3b80d8

apparently we have "windows" and "coff", which are different(?)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77197 91177308-0d34-0410-b5e6-96231b3b80d8

sink text/data section creation down into the target-specific places that
should know about them.  PECoff doesn't share these, and I want all sections
to be created by object-file-specific code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77196 91177308-0d34-0410-b5e6-96231b3b80d8

Test case to check that separate section is created for a global variable specified with section attribute.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77195 91177308-0d34-0410-b5e6-96231b3b80d8

Change the assembly syntax for nsw, nuw, and exact, putting them
after their associated opcodes rather than before. This makes them
a little easier to read.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77194 91177308-0d34-0410-b5e6-96231b3b80d8

Fix wording in comments.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77193 91177308-0d34-0410-b5e6-96231b3b80d8

update testcase.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77192 91177308-0d34-0410-b5e6-96231b3b80d8

32-bit darwin targets support .literal16 too.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77191 91177308-0d34-0410-b5e6-96231b3b80d8

Remove trailing slashes from include paths. Some versions of mingw don't like them.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77188 91177308-0d34-0410-b5e6-96231b3b80d8

Test commit: fix typo

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77187 91177308-0d34-0410-b5e6-96231b3b80d8

Eliminate getNamed/getUnnamedSection, adding a new and unified getOrCreateSection
instead.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77186 91177308-0d34-0410-b5e6-96231b3b80d8

Eliminate SectionFlags, just embed a SectionKind into Section
instead and drive things based off of that.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77184 91177308-0d34-0410-b5e6-96231b3b80d8

If CPSR is modified but the def is dead, then it's ok to fold the load / store.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77182 91177308-0d34-0410-b5e6-96231b3b80d8

Use t2LDRi12 and t2STRi12 to load / store to / from stack frames. Eliminate more getOpcode calls.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77181 91177308-0d34-0410-b5e6-96231b3b80d8

Generate a libcall for i8 multiply.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77179 91177308-0d34-0410-b5e6-96231b3b80d8

fixed incorrect lowering of ISD::SUB node. SUB has only one result value.
It wasn't caught during tests because we never got a sub generated, (i8 was always getting promoted to int, which in turn was broken into subc/sube). Though the optimizer leaves an i8 sub now.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77178 91177308-0d34-0410-b5e6-96231b3b80d8

Use the right instructions to copy between GPR and the more strictive tGPR classes. t2MOV does not match the RC requirements.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77175 91177308-0d34-0410-b5e6-96231b3b80d8

Merge isLoadFromStackSlot into one since it behaves the same regardless of sub-target.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77174 91177308-0d34-0410-b5e6-96231b3b80d8

Just use a single isMoveInstr to catch all the cases.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77173 91177308-0d34-0410-b5e6-96231b3b80d8

Rename tMOVhi2lor to tMOVgpr2tgpr. It's not moving from a high register to a low register. It's moving from a GPR register class to a more restrictive tGPR class. Also change tMOVlor2hir, and tMOVhir2hir.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77172 91177308-0d34-0410-b5e6-96231b3b80d8

Reorganize code a bit to reduce indentation.  No visible functionality
change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77171 91177308-0d34-0410-b5e6-96231b3b80d8

Fix libLTO:
 * Call InitializeAllTargets on every path where we might query the
   TargetRegistry. This fixes PR4604.
 * flush the formatted_raw_ostream& or else not all of the assembly will make
   it to the .s file. (It doesn't do this in its destructor?!)
 * Due to a reversed conditional, libLTO was reporting many symbols as both
   defined and undefined, including two definitions of the same symbol name
   in its symbol list.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77170 91177308-0d34-0410-b5e6-96231b3b80d8

Don't use llvm_report_error in libSystem, this is a layering violation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77169 91177308-0d34-0410-b5e6-96231b3b80d8

untangle a TargetAsmInfo hack where ELFTargetAsmInfo would create a
'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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77165 91177308-0d34-0410-b5e6-96231b3b80d8

Refactor. Get rid of a few more getOpcode() calls.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77164 91177308-0d34-0410-b5e6-96231b3b80d8

reduce indentation

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77161 91177308-0d34-0410-b5e6-96231b3b80d8

Use the RHS length instead of the LHS length.  They are both the same,
but this ends up compiling code like this:

int foo(const StringRef &R) {
  return R == "food";
}

to use a constant sized memcmp instead of a variable memcmp.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77160 91177308-0d34-0410-b5e6-96231b3b80d8

Fix the breakage caused by 76950.
PIC16 has special naming conventions for variables having section names specified via section attribute.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77153 91177308-0d34-0410-b5e6-96231b3b80d8

Remove Value::getName{Start,End}, the last of the old Name APIs.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77152 91177308-0d34-0410-b5e6-96231b3b80d8

Make sure getName().data() is always null terminated.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77149 91177308-0d34-0410-b5e6-96231b3b80d8

Remove Value::getNameLen

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77148 91177308-0d34-0410-b5e6-96231b3b80d8

Move MSILModule and MSILWriter into the 'llvm' namespace, instead of the 'MSIL'
namespace which could very well conflict with non-LLVM code.

Also clean up some spacing, remove an extra header.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77146 91177308-0d34-0410-b5e6-96231b3b80d8

Eliminate some uses of DOUT, cerr, and getNameStart().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77145 91177308-0d34-0410-b5e6-96231b3b80d8

remove a densemap from TargetAsmInfo that was uniquing the targetflags strings,
just use a smallstring instead.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77144 91177308-0d34-0410-b5e6-96231b3b80d8

simplify SectionFlagsForGlobal, even though I want to kill it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77143 91177308-0d34-0410-b5e6-96231b3b80d8

make SectionKind keep track of whether a global had an explicit
section specified for it or not.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77142 91177308-0d34-0410-b5e6-96231b3b80d8

simplify this code now that SectionKind knows if a global is weak or not.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77141 91177308-0d34-0410-b5e6-96231b3b80d8

make SectionKind know whether a symbol is weak or not in addition
to its classification.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77140 91177308-0d34-0410-b5e6-96231b3b80d8

Make the kind actually be private.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77139 91177308-0d34-0410-b5e6-96231b3b80d8

rename Mergable -> Mergeable and Writable -> Writeable

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77138 91177308-0d34-0410-b5e6-96231b3b80d8

two files I missed in the last commit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77137 91177308-0d34-0410-b5e6-96231b3b80d8

remove a bunch of helper functions, just use SectionKind::get instead.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77135 91177308-0d34-0410-b5e6-96231b3b80d8

simplify getSectionForMergableConstant to take a SectionKind.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77134 91177308-0d34-0410-b5e6-96231b3b80d8

precreate 4/8/16 byte mergable sections to simplify code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77133 91177308-0d34-0410-b5e6-96231b3b80d8

introduce specialized mergable const sectionkinds for elements of size 4/8/16 to
simplify targets.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77132 91177308-0d34-0410-b5e6-96231b3b80d8

improve the default impl of getSectionForMergableConstant by
putting readonly constants in the readonly section if we have one.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77131 91177308-0d34-0410-b5e6-96231b3b80d8

make elf targets correctly handle constant pool entries that require relocations.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77130 91177308-0d34-0410-b5e6-96231b3b80d8

Rearrange all the SectionKinds and structure them into a hierarchical
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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77129 91177308-0d34-0410-b5e6-96231b3b80d8

Update target registration description in Writing An LLVM Backend, and add
a mention in release notes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77128 91177308-0d34-0410-b5e6-96231b3b80d8

Sort list of targets in --version.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77127 91177308-0d34-0410-b5e6-96231b3b80d8

Factor commonality in triple match routines into helper template for registering
classes, and migrate existing targets over.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77126 91177308-0d34-0410-b5e6-96231b3b80d8

Oops, forgot XCore. Sorry XCore!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77125 91177308-0d34-0410-b5e6-96231b3b80d8

Update for API change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77124 91177308-0d34-0410-b5e6-96231b3b80d8

fix isReadOnly predicate to not include data that has to be
writable because of teh dynamic linker.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77122 91177308-0d34-0410-b5e6-96231b3b80d8

remove a dead enum case.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77121 91177308-0d34-0410-b5e6-96231b3b80d8

Update Triple to use StringRef/Twine based APIs.
 - This is now shorter, simpler, safer, and more efficient, what a deal.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77119 91177308-0d34-0410-b5e6-96231b3b80d8

Add StringRef::{slice, split}, two convenient string operations which are simple
and efficient on a StringRef.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77117 91177308-0d34-0410-b5e6-96231b3b80d8

put normal data into .data instead of .data.rel on elf systems.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77116 91177308-0d34-0410-b5e6-96231b3b80d8

Remove unused header

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77115 91177308-0d34-0410-b5e6-96231b3b80d8

Kill Target specific ModuleMatchQuality stuff.
 - This was overkill and inconsistently implemented.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77114 91177308-0d34-0410-b5e6-96231b3b80d8

Add TargetRegistry::lookupTarget.
 - This is a simplified mechanism which just looks up a target based on the
   target triple, with a few additional flags.

 - Remove getClosestStaticTargetForModule, the moral equivalent is now:
     lookupTarget(Mod->getTargetTriple, true, false, ...);

 - This no longer does the fuzzy matching with target data (based on endianness
   and pointer width) that getClosestStaticTargetForModule was doing, but this
   was deemed unnecessary.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77111 91177308-0d34-0410-b5e6-96231b3b80d8

eliminate a pointless switch stmt.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77110 91177308-0d34-0410-b5e6-96231b3b80d8

finish simplifying DarwinTargetAsmInfo::SelectSectionForGlobal
for now.  Make the section switching directives more consistent
by not including \n and including \t for them all.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77107 91177308-0d34-0410-b5e6-96231b3b80d8

Some clients rely on getName{Start,End} not returning 0, even if the length is
0.
 - I could have swore the prev change went through a make check cycle...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77106 91177308-0d34-0410-b5e6-96231b3b80d8

Rewrite getName{Start,End,Len} in terms of getName(), instead of vice-versa.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77105 91177308-0d34-0410-b5e6-96231b3b80d8

simplify DarwinTargetAsmInfo::SelectSectionForGlobal a bit
and make it more aggressive, we now put:

const int G2 __attribute__((weak)) = 42;

into the text (readonly) segment like gcc, previously we put
it into the data (readwrite) segment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77104 91177308-0d34-0410-b5e6-96231b3b80d8

simplify some predicates, add isMergableString()

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77103 91177308-0d34-0410-b5e6-96231b3b80d8

Simplify.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77102 91177308-0d34-0410-b5e6-96231b3b80d8

Add support for ARM Neon VREV instructions.
Patch by Anton Korzh, with some modifications from me.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77101 91177308-0d34-0410-b5e6-96231b3b80d8

Remove Value::setName(const char*, unsigned).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77100 91177308-0d34-0410-b5e6-96231b3b80d8

Remove Value::setName(const char*).
 - Split into a separate patch because there is a slight functionality change,
   it is no longer valid to call setName(0), which was equivalent to
   setName(""). I'm hoping no one depends on this...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77099 91177308-0d34-0410-b5e6-96231b3b80d8

Remove Value::{isName, getNameRef}.

Also, change MDString to use a StringRef.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77098 91177308-0d34-0410-b5e6-96231b3b80d8

make SectionKind be a first-class pod struct instead of just
an enum.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77096 91177308-0d34-0410-b5e6-96231b3b80d8

Added a test and fixed a bug in BumpPtrAllocator relating to large alignment
values.  Hopefully this fixes PR4622.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77088 91177308-0d34-0410-b5e6-96231b3b80d8

this is (unfortunately) several changes mixed together:

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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77085 91177308-0d34-0410-b5e6-96231b3b80d8

document some invariants.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77084 91177308-0d34-0410-b5e6-96231b3b80d8

add the most expedient hack to fix PR4619, along with a testcase.
Thanks to Rafael for the great example.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77083 91177308-0d34-0410-b5e6-96231b3b80d8

Fix a few comments to say "backedge-taken count" instead of
"trip count".

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77081 91177308-0d34-0410-b5e6-96231b3b80d8

SCEV objects are no longer reference-counted.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77080 91177308-0d34-0410-b5e6-96231b3b80d8

Update comments to new-style syntax.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77079 91177308-0d34-0410-b5e6-96231b3b80d8

When attempting to sign-extend an addrec by interpreting
the step value as unsigned, the start value and the addrec
itself still need to be treated as signed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77078 91177308-0d34-0410-b5e6-96231b3b80d8

Remove spurious semicolons.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77077 91177308-0d34-0410-b5e6-96231b3b80d8

Convert DOUT to DEBUG.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77065 91177308-0d34-0410-b5e6-96231b3b80d8

Simplify JIT target selection.
 - Instead of requiring targets to define a JIT quality match function, we just
   have them specify if they support a JIT.

 - Target selection for the JIT just gets the host triple and looks for the best
   target which matches the triple and has a JIT.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77060 91177308-0d34-0410-b5e6-96231b3b80d8