[AArch64][MachO] Encode @AUTH to ARM64_RELOC_AUTHENTICATED_POINTER.

This adds MachO support for emission of authenticated pointer
relocations.

We already support AArch64AuthMCExpr, to represent ass

[AArch64][MachO] Encode @AUTH to ARM64_RELOC_AUTHENTICATED_POINTER.

This adds MachO support for emission of authenticated pointer
relocations.

We already support AArch64AuthMCExpr, to represent assembly expressions
such as:
.quad <symbol>@AUTH(<key>, <discriminator> [, addr])
For example:
.quad _g3@AUTH(ib, 1234, addr)

These @AUTH expressions lower to a new kind of MachO relocation:
ARM64_RELOC_AUTHENTICATED_POINTER (11)

The relocation points to the referenced symbol.
The other data, describing the signing scheme and original addend
(only 32 bits instead of 64), is encoded into the addend (in the
relocated location):

|63|62|61-51|50-49| 48 |47 - 32|31 - 0|
| 1| 0| 0 | key | addr | discriminator | addend |

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[MC] Remove unused MCAsmLayout declarations and includes

MachObjectWriter: replace the MCAsmLayout parameter with MCAssembler

[MC] Remove MCAsmLayout::getFragmentAddress

[MC] Remove the MCAsmLayout parameter from MCMachObjectTargetWriter

[MC] Move Mach-O specific getAtom and isSectionAtomizableBySymbols to Mach-O files

and devirtualize isSectionAtomizableBySymbols.

[AArch64][MachO] Drop a 2015 ld64 workaround avoiding local relocations

Commit d6223a24718df3c30b67422c2eb6d0e93af9c4e8 introduced an ld64 workaround
that disables local relocations for many pointer

[AArch64][MachO] Drop a 2015 ld64 workaround avoiding local relocations

Commit d6223a24718df3c30b67422c2eb6d0e93af9c4e8 introduced an ld64 workaround
that disables local relocations for many pointer-sized relocations (e.g.
relocations referencing `__DATA,__literal*`).

ld64 has been fixed long ago (2015). Drop this workaround so that the
behavior matches x86-64.

Reviewed By: pete

Differential Revision: https://reviews.llvm.org/D152831

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AArch64: diagnose out of range relocation addends on MachO.

MachO only has 24-bit addends for most relocations, small enough that it can
overflow in semi-reasonable functions and cause insidious bug

AArch64: diagnose out of range relocation addends on MachO.

MachO only has 24-bit addends for most relocations, small enough that it can
overflow in semi-reasonable functions and cause insidious bugs if compiled
without assertions enabled. Switch it to an actual error instead.

The condition isn't quite identical because ld64 treats the addend as a signed
number.

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[MC] Rename MCSection*::getSectionName() to getName(). NFC

A pending change will merge MCSection*::getName() to MCSection::getName().

[macho][NFC] Extract all CPU_(SUB_)TYPE logic to BinaryFormat

This moves all the logic of converting LLVM Triples to
MachO::CPU_(SUB_)TYPE from the specific target (Target)AsmBackend to
more conveni

[macho][NFC] Extract all CPU_(SUB_)TYPE logic to BinaryFormat

This moves all the logic of converting LLVM Triples to
MachO::CPU_(SUB_)TYPE from the specific target (Target)AsmBackend to
more convenient functions in lib/BinaryFormat.

This also gets rid of the separate two X86AsmBackend classes.

The previous attempt was to add it to libObject, but that adds an
unnecessary dependency to libObject from all the targets.

Differential Revision: https://reviews.llvm.org/D74808

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Revert "[macho][NFC] Extract all CPU_(SUB_)TYPE logic to libObject"

This reverts commit 726c342ce27ada28efe90cb04ffb69c75065710a.

This breaks the windows bots with linker errors.

[macho][NFC] Extract all CPU_(SUB_)TYPE logic to libObject

This moves all the logic of converting LLVM Triples to
MachO::CPU_(SUB_)TYPE from the specific target (Target)AsmBackend to
more convenient

[macho][NFC] Extract all CPU_(SUB_)TYPE logic to libObject

This moves all the logic of converting LLVM Triples to
MachO::CPU_(SUB_)TYPE from the specific target (Target)AsmBackend to
more convenient functions in libObject.

This also gets rid of the separate two X86AsmBackend classes.

Differential Revision: https://reviews.llvm.org/D74808

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[MC] Minor cleanup to MCFixup::Kind handling. NFC.

Prefer `MCFixupKind` where possible and add getTargetKind() to
convert to `unsigned` when needed rather than scattering cast
operators around the p

[MC] Minor cleanup to MCFixup::Kind handling. NFC.

Prefer `MCFixupKind` where possible and add getTargetKind() to
convert to `unsigned` when needed rather than scattering cast
operators around the place.

Differential Revision: https://reviews.llvm.org/D59890

llvm-svn: 369720

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[llvm] Migrate llvm::make_unique to std::make_unique

Now that we've moved to C++14, we no longer need the llvm::make_unique
implementation from STLExtras.h. This patch is a mechanical replacement
of

[llvm] Migrate llvm::make_unique to std::make_unique

Now that we've moved to C++14, we no longer need the llvm::make_unique
implementation from STLExtras.h. This patch is a mechanical replacement
of (hopefully) all the llvm::make_unique instances across the monorepo.

llvm-svn: 369013

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AArch64: support binutils-like things on arm64_32.

This adds support for the arm64_32 watchOS ABI to LLVM's low level tools,
teaching them about the specific MachO choices and constants needed to
di

AArch64: support binutils-like things on arm64_32.

This adds support for the arm64_32 watchOS ABI to LLVM's low level tools,
teaching them about the specific MachO choices and constants needed to
disassemble things.

llvm-svn: 360663

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Update the file headers across all of the LLVM projects in the monorepo
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the ne

Update the file headers across all of the LLVM projects in the monorepo
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636

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MC: Separate creating a generic object writer from creating a target object writer. NFCI.

With this we gain a little flexibility in how the generic object
writer is created.

Part of PR37466.

Diffe

MC: Separate creating a generic object writer from creating a target object writer. NFCI.

With this we gain a little flexibility in how the generic object
writer is created.

Part of PR37466.

Differential Revision: https://reviews.llvm.org/D47045

llvm-svn: 332868

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Recommit r329716 "Add missing nullptr check before getSection() to AArch64MachObjectWriter::recordRelocation"

This commit fixes the bot failures that were coming up before with r329716.

The fix was

Recommit r329716 "Add missing nullptr check before getSection() to AArch64MachObjectWriter::recordRelocation"

This commit fixes the bot failures that were coming up before with r329716.

The fix was to move the check for "isInSection()" inside of the if condition
and emit the error there instead of waiting to get past the unreachable statement.

This should work in debug and release builds now.

llvm-svn: 329746

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Revert 329716 "Add missing nullptr check before getSection() to AArch64MachObjectWriter::recordRelocation"

This broke a bunch of bots so I'm reverting while I figure it out.

llvm-svn: 329728

Add missing nullptr check to AArch64MachObjectWriter::recordRelocation

There was missing nullptr check before a call to getSection() in
recordRelocation. This would result in a segfault in code like

Add missing nullptr check to AArch64MachObjectWriter::recordRelocation

There was missing nullptr check before a call to getSection() in
recordRelocation. This would result in a segfault in code like the attached
test.

This adds the missing check and a test which makes sure we get the expected
error output.

llvm-svn: 329716

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Delete code that is probably dead since r249303.

With r249303 the expression evaluation should expand variables that
are not in sections (and so don't have an atom).

llvm-svn: 326966

[MC] Thread unique_ptr<MCObjectWriter> through the create.*ObjectWriter
functions.

This makes the ownership of the resulting MCObjectWriter clear, and allows us
to remove one instance of MCObjectStr

[MC] Thread unique_ptr<MCObjectWriter> through the create.*ObjectWriter
functions.

This makes the ownership of the resulting MCObjectWriter clear, and allows us
to remove one instance of MCObjectStreamer's bizarre "holding ownership via
someone else's reference" trick.

llvm-svn: 315327

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[MC] Plumb unique_ptr<MCMachObjectTargetWriter> through createMachObjectWriter
to MCObjectWriter's constructor.

MCObjectWriter takes ownership of its MCMachObjectTargetWriter argument -- this
patch

[MC] Plumb unique_ptr<MCMachObjectTargetWriter> through createMachObjectWriter
to MCObjectWriter's constructor.

MCObjectWriter takes ownership of its MCMachObjectTargetWriter argument -- this
patch plumbs that ownership relationship through the constructor (which
previously took raw MCMachObjectTargetWriter*) and the createMachObjectWriter
function.

llvm-svn: 315245

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Move Object format code to lib/BinaryFormat.

This creates a new library called BinaryFormat that has all of
the headers from llvm/Support containing structure and layout
definitions for various type

Move Object format code to lib/BinaryFormat.

This creates a new library called BinaryFormat that has all of
the headers from llvm/Support containing structure and layout
definitions for various types of binary formats like dwarf, coff,
elf, etc as well as the code for identifying a file from its
magic.

Differential Revision: https://reviews.llvm.org/D33843

llvm-svn: 304864

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[AArch64] Fix some Include What You Use warnings; other minor fixes (NFC).

This is preparation to reduce MCExpr.h dependencies.

llvm-svn: 294053