[clang-format][NFC] Remove redundnat llvm::, clang::, etc.

[clang-format] Undo the change to TestLexer() in commit 32e65b0b8a74

We can't skip calling getFormattingLangOpts() because LangOpts is not
initialized in the unit tests.

Reland "[clang-format][NFC] Make LangOpts global in namespace Format (#81390)"

Restore getFormattingLangOpts().

Revert "[clang-format][NFC] Make LangOpts global in namespace Format (#81390)"

This reverts commit 03f571995b4f0c260254955afd16ec44d0764794.

We can't hide getFormattingLangOpts() as it's used by ot

Revert "[clang-format][NFC] Make LangOpts global in namespace Format (#81390)"

This reverts commit 03f571995b4f0c260254955afd16ec44d0764794.

We can't hide getFormattingLangOpts() as it's used by other tools.

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[clang-format][NFC] Make LangOpts global in namespace Format (#81390)

[clang-format] Add simple macro replacements in formatting.

Add configuration to specify macros.
Macros will be expanded, and the code will be parsed and annotated
in the expanded state. In a second

[clang-format] Add simple macro replacements in formatting.

Add configuration to specify macros.
Macros will be expanded, and the code will be parsed and annotated
in the expanded state. In a second step, the formatting decisions
in the annotated expanded code will be reconstructed onto the
original unexpanded macro call.

Eventually, this will allow to remove special-case code for
various macro options we accumulated over the years in favor of
one principled mechanism.

Differential Revision: https://reviews.llvm.org/D144170

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[clang-format] Reformat. NFC.

[clang-format] [NFC] Fix the coding style of unit tests header file

[llvm][clang][NFC] updates inline licence info

Some files still contained the old University of Illinois Open Source
Licence header. This patch replaces that with the Apache 2 with LLVM
Exception li

[llvm][clang][NFC] updates inline licence info

Some files still contained the old University of Illinois Open Source
Licence header. This patch replaces that with the Apache 2 with LLVM
Exception licence.

Differential Revision: https://reviews.llvm.org/D107528

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Fix use-after-scope introduced in 850325348ae82cd5e26ea9edfd04219d0fbe7828

[clang-format] Fix misformatted macro definitions after D86959

After D86959 the code `#define lambda [](const decltype(x) &ptr) {}`
was formatted as `#define lambda [](const decltype(x) & ptr) {}` d

[clang-format] Fix misformatted macro definitions after D86959

After D86959 the code `#define lambda [](const decltype(x) &ptr) {}`
was formatted as `#define lambda [](const decltype(x) & ptr) {}` due to
now parsing the '&' token as a BinaryOperator. The problem was caused by
the condition `Line.InPPDirective && (!Left->Previous || !Left->Previous->is(tok::identifier))) {`
being matched and therefore not performing the checks for "previous token
is one of decltype/_Atomic/etc.". This patch moves those checks after the
existing if/else chain to ensure the left-parent token classification is
always run after checking whether the contents of the parens is an
expression or not.

This change also introduces a new TokenAnnotatorTest that checks the
token kind and Role of Tokens after analyzing them. This is used to check
for TT_PointerOrReference, in addition to indirectly testing this based
on the resulting formatting.

Reviewed By: MyDeveloperDay

Differential Revision: https://reviews.llvm.org/D88956

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clang/Frontend: Use MemoryBufferRef in FrontendInputFile (and remove SourceManager::getBuffer)

In order to drop the final callers to `SourceManager::getBuffer`, change
`FrontendInputFile` to use `Op

clang/Frontend: Use MemoryBufferRef in FrontendInputFile (and remove SourceManager::getBuffer)

In order to drop the final callers to `SourceManager::getBuffer`, change
`FrontendInputFile` to use `Optional<MemoryBufferRef>`. Also updated
the "unowned" version of `SourceManager::createFileID` to take a
`MemoryBufferRef` (it now calls `MemoryBuffer::getMemBuffer`, which
creates a `MemoryBuffer` that does not own the buffer data).

Differential Revision: https://reviews.llvm.org/D89427

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[clang-format][tests] Fix MacroExpander lexer not parsing C++ keywords

While debugging a different clang-format failure, I tried to reuse the
MacroExpander lexer, but was surprised to see that it ma

[clang-format][tests] Fix MacroExpander lexer not parsing C++ keywords

While debugging a different clang-format failure, I tried to reuse the
MacroExpander lexer, but was surprised to see that it marks all C++
keywords (e.g. const, decltype) as being of type identifier. After stepping
through the ::format() code, I noticed that the difference between these
two is that the identifier table was not being initialized based on the
FormatStyle, so only basic tokens such as tok::semi, tok::plus, etc. were
being handled.

Reviewed By: klimek

Differential Revision: https://reviews.llvm.org/D88952

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[clang-format] Add a MacroExpander.

Summary:
The MacroExpander allows to expand simple (non-resursive) macro
definitions from a macro identifier token and macro arguments. It
annotates the tokens wi

[clang-format] Add a MacroExpander.

Summary:
The MacroExpander allows to expand simple (non-resursive) macro
definitions from a macro identifier token and macro arguments. It
annotates the tokens with a newly introduced MacroContext that keeps
track of the role a token played in expanding the macro in order to
be able to reconstruct the macro expansion from an expanded (formatted)
token stream.

Made Token explicitly copy-able to enable copying tokens from the parsed
macro definition.

Reviewers: sammccall

Subscribers: mgorny, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D83296

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