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The pointer is dereferenced immediately, so assert the cast is correct instead of returning nullptr

Identified with readability-redundant-control-flow.

Run clang-tidy on all source files under `clang-tools-extra/clang-tidy`
with `-header-filter=clang-tidy.*` and make suggested corrections.

Differential Revision: https://reviews.llvm.org/D112864

Applied fixes enabled by the LLVM's .clang-tidy configs. Reverted files where
fixes introduced compile errors:
  clang-tools-extra/clang-tidy/hicpp/NoAssemblerCheck.cpp
  clang-tools-extra/clang-tidy/misc/ThrowByValueCatchByReferenceCheck.cpp

$ clang-tools-extra/clang-tidy/tool/run-clang-tidy.py -fix clang-tools-extra/clang-tidy/
Enabled checks:
    llvm-else-after-return
    llvm-header-guard
    llvm-include-order
    llvm-namespace-comment
    llvm-prefer-isa-or-dyn-cast-in-conditionals
    llvm-prefer-register-over-unsigned
    llvm-qualified-auto
    llvm-twine-local
    misc-definitions-in-headers
    misc-misplaced-const
    misc-new-delete-overloads
    misc-no-recursion
    misc-non-copyable-objects
    misc-redundant-expression
    misc-static-assert
    misc-throw-by-value-catch-by-reference
    misc-unconventional-assign-operator
    misc-uniqueptr-reset-release
    misc-unused-alias-decls
    misc-unused-using-decls
    readability-identifier-naming

Reviewed By: aaron.ballman

Differential Revision: https://reviews.llvm.org/D95614

Differential Revision: https://reviews.llvm.org/D77458

This is how it should've been and brings it more in line with
std::string_view. There should be no functional change here.

This is mostly mechanical from a custom clang-tidy check, with a lot of
manual fixups. It uncovers a lot of minor inefficiencies.

This doesn't actually modify StringRef yet, I'll do that in a follow-up.

llvm-svn: 352088

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

Summary:
Previously, we'd only match on literal floating or integral zeroes, but I've now also learned that some users spell that value as int{0} or float{0}, which also need to be matched.

Differential Revision: https://reviews.llvm.org/D56012

llvm-svn: 349953

Summary:
This check finds instances where Duration values are being converted to a numeric value in a comparison expression, and suggests that the conversion happen on the other side of the expression to a Duration.  See documentation for examples.

This also shuffles some code around so that the new check may perform in sone step simplifications also caught by other checks.
Compilation is unbroken, because the hash-function is now directly
specified for std::unordered_map, as 'enum class' does not compile as
key (seamingly only on some compilers).

Patch by hwright.

Reviewers: aaron.ballman, JonasToth, alexfh, hokein

Reviewed By: JonasToth

Subscribers: sammccall, Eugene.Zelenko, xazax.hun, cfe-commits, mgorny

Tags: #clang-tools-extra

Differential Revision: https://reviews.llvm.org/D54737

llvm-svn: 348169

This commit broke buildbots and needs adjustments.

llvm-svn: 348165

Summary:
This check finds instances where Duration values are being converted to a numeric value in a comparison expression, and suggests that the conversion happen on the other side of the expression to a Duration.  See documentation for examples.

This also shuffles some code around so that the new check may perform in sone step simplifications also caught by other checks.

Patch by hwright.

Reviewers: aaron.ballman, JonasToth, alexfh, hokein

Reviewed By: JonasToth

Subscribers: sammccall, Eugene.Zelenko, xazax.hun, cfe-commits, mgorny

Tags: #clang-tools-extra

Differential Revision: https://reviews.llvm.org/D54737

llvm-svn: 348161

This check removes unneeded scaling of arguments when calling Abseil Time factory functions.

Patch by Hyrum Wright.

llvm-svn: 347163