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361226 nik
[Preamble] Reuse preamble even if an unsaved file does not exist

When a preamble is created an unsaved file not existing on disk is
already part of PrecompiledPreamble::FilesInPreamble. However, when
checking whether the preamble can be re-used, a failed stat of such an
unsaved file invalidated the preamble, which led to pointless and time
consuming preamble regenerations on subsequent reparses.

Do not require anymore that unsaved files should exist on disk.

This avoids costly preamble invalidations depending on timing issues for
the cases where the file on disk might be removed just to be regenerated
a bit later.

It also allows an IDE to provide in-memory files that might not exist on
disk, e.g. because the build system hasn't generated those yet.

Differential Revision: https://reviews.llvm.org/D41005
361225 baloghadamsoftware
[clang-tidy] New option for misc-throw-by-value-catch-by-reference

Catching trivial objects by value is not dangerous but may be
inefficient if they are too large. This patch adds an option
`WarnOnLargeObject` to the checker to also warn if such an object
is caught by value. An object is considered as "large" if its
size is greater than `MaxSize` which is another option. Default
value is the machine word of the architecture (size of the type

Differential Revision: https://reviews.llvm.org/D61851

361224 labath
DWARF: Introduce DWARFUnitHeader class

This patch introduces the DWARFUnitHeader class. Its purpose (and its
structure, to the extent it was possible to make it) is the same as its
LLVM counterpart -- to extract the unit header information before we
actually construct the unit, so that we know which kind of units to
construct. This is needed because as of DWARF5, type units live in the
.debug_info section, which means it's not possible to statically
determine the type of units in a given section.

Reviewers: aprantl, clayborg, JDevlieghere

Subscribers: lldb-commits

Differential Revision: https://reviews.llvm.org/D62073
361223 phosek
[CMake] Specify component for all target types

This addresses an issue introduced in r360230 which broke existing
target types are no longer handled as components.

Differential Revision: https://reviews.llvm.org/D62176
361222 dylanmckay
Add TargetLoweringInfo hook for explicitly setting the ABI calling convention endianess

The endianess used in the calling convention does not always match the
endianess of the target on all architectures, namely AVR.

When an argument is too large to be legalised by the architecture and is
split for the ABI, a new hook TargetLoweringInfo::shouldSplitFunctionArgumentsAsLittleEndian
is queried to find the endianess that function arguments must be laid
out in.

This approach was recommended by Eli Friedman.

Originally reported in https://github.com/avr-rust/rust/issues/129.

Patch by Carl Peto.

Reviewers: bogner, t.p.northover, RKSimon, niravd, efriedma

Reviewed By: efriedma

Subscribers: JDevlieghere, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D62003
361221 qshanz
[NFC][PowerPC] Add a test to verify if the scheduler schedule the addi before the load.

361220 nikic
Move thumbv7k test from AArch64 to ARM

As pointed out by charukcs on rL361166, this test uses an ARM triple.
361219 shchenz
[PowerPC] test cases for selecting x-form instruction for unaligned offset - NFC
361218 shchenz
[PowerPC] use more meaningful name - NFC
361216 xiaobai
[CMake] Correct some dependencies

Symbol doesn't depend on CPlusPlusLanguage, but Expressiond does.
361215 lhames
[ORC] Assert that JITDylibs have unique names.

Patch by Praveen Velliengiri. Thanks Praveen!

Differential Revision: https://reviews.llvm.org/D62139
361214 nico
Tweaks for setting CMAKE_LINKER to lld-link

- Just look for "lld-link", not "lld-link.exe".
  llvm/cmake/platforms/WinMsvc.cmake for example sets CMAKE_LINKER to
  lld-link without .exe

- Stop passing -gwarf to the compiler in sanitizer options when lld is
  enabled -- there's no reason to use different debug information keyed
  off the linker. (If this was for MinGW, we should check for that

Differential Revision: https://reviews.llvm.org/D62111
361213 maskray
[ELF] Error on relocations to local undefined symbols

For a reference to a local symbol, ld.bfd and gold error if the symbol
is defined in a discarded section but accept it if the symbol is
undefined. This inconsistent behavior seems unnecessary for us (it
probably makes sense for them as they differentiate local/global
symbols, the error would mean more code).

Catch such errors. Symbol index 0 may be used by marker relocations,
e.g. R_*_NONE R_ARM_V4BX. Don't error on them.

The difference from D61563 (which caused msan failure) is we don't call
Sym.computeBinding() on local symbols - VersionId is uninitialized.
361212 nico
Revert r361206 "[COFF] Store alignment in log2 form, NFC"

Makes the linker crash when linking nasm.exe.
361210 compnerd
lldb-server: LLGS: support 32-bit on 64-bit hosts

Enable the ARM emulation support on AArch64 which can execute ARM32
code. Similarly, handle MIPS 32 on 64.
361209 nico
Try to fix build with older gccs after r361152

Also merge the cmake change there to the gn build.
361208 rsmith
Give 'fixit-cxx0x.cpp' a more modern name.
361207 phosek
[builtins] Deduplicate __eqsf2 and __gtsf2 via macro

The only difference between __eqsf2 and __gtsf2 is whether they return
1 or -1 on NaN. Rather than duplicating all the code, use a macro to
define the function twice and use an argument to decide whether to
negate the return value.

Differential Revision: https://reviews.llvm.org/D61919
361206 rnk
[COFF] Store alignment in log2 form, NFC

Valid section or chunk alignments are powers of 2 in the range [1,
8192]. These can be stored more canonically in log2 form to free up some
bits in Chunk. Combined with D61696, SectionChunk gets 8 bytes smaller.

Reviewers: ruiu, aganea

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D61698
361205 leonardchan
[Sema] Fix for build on some iOS programs.

Nullability attributes weren't being stripped for AttributedTypes that
were wrapped in a MacroQualifiedType. This fix adds a check for this
type and a test.
361204 meinersbur
[CodeGen] Fix order of PHINode and MA Write generation.

At the end of a region statement, the PHINode must be generated
while the current IRBuilder's block is the region's exit node. For
obvious reasons: The PHINode references the region's exiting block.
A partial write would insert new control flow, i.e. insert new basic
blocks between the exiting blocks and the current block.

We fix this by generating the PHI nodes (region exit values) before
generating any MemoryAccess's stores.

This should fix the AOSP buildbot.

Reported-by: Eli Friedman <efriedma@quicinc.com>
361203 nickdesaulniers
[ORC] fix use-after-move. NFC

scan-build flagged a potential use-after-move in debug builds.  It's not
safe that a moved from value contains anything but garbage.  Manually
DRY up these repeated expressions.

Reviewers: lhames

Reviewed By: lhames

Subscribers: hiraditya, llvm-commits, srhines

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D62112
361202 arsenm
AMDGPU: Force skip branches over calls

Unfortunately the way SIInsertSkips works is backwards, and is
required for correctness. r338235 added handling of some special cases
where skipping is mandatory to avoid side effects if no lanes are
active. It conservatively handled asm correctly, but the same logic
needs to apply to calls.

Usually the call sequence code is larger than the skip threshold,
although the way the count is computed is really broken, so I'm not
sure if anything was likely to really hit this.
361201 marshall
Ensure that hash<basic_string> uses char_traits. Fixes PR#41876. Reviewed as https://reviews.llvm.org/D61954
361200 lhames
[docs] Fix an RST typo: "code-blocks" should be "code-block".