clang-tools
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clang-tidy
llvm
PreferIsaOrDynCastInConditionalsCheck.h
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//===--- PreferIsaOrDynCastInConditionalsCheck.h - clang-tidy ---*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_LLVM_PREFERISAORDYNCASTINCONDITIONALSCHECK_H
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#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_LLVM_PREFERISAORDYNCASTINCONDITIONALSCHECK_H
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#include "../ClangTidyCheck.h"
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namespace
clang
{
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namespace
tidy {
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namespace
llvm_check {
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/// \brief Looks at conditionals and finds and replaces cases of ``cast<>``, which will
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/// assert rather than return a null pointer, and ``dyn_cast<>`` where
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/// the return value is not captured. Additionally, finds and replaces cases that match the
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/// pattern ``var && isa<X>(var)``, where ``var`` is evaluated twice.
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///
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/// Finds cases like these:
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/// \code
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/// if (auto x = cast<X>(y)) {}
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/// // is replaced by:
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/// if (auto x = dyn_cast<X>(y)) {}
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///
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/// if (cast<X>(y)) {}
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/// // is replaced by:
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/// if (isa<X>(y)) {}
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///
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/// if (dyn_cast<X>(y)) {}
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/// // is replaced by:
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/// if (isa<X>(y)) {}
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///
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/// if (var && isa<T>(var)) {}
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/// // is replaced by:
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/// if (isa_and_nonnull<T>(var.foo())) {}
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/// \endcode
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///
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/// // Other cases are ignored, e.g.:
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/// \code
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/// if (auto f = cast<Z>(y)->foo()) {}
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/// if (cast<Z>(y)->foo()) {}
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/// if (X.cast(y)) {}
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/// \endcode
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///
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/// For the user-facing documentation see:
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/// http://clang.llvm.org/extra/clang-tidy/checks/llvm-prefer-isa-or-dyn-cast-in-conditionals.html
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class
PreferIsaOrDynCastInConditionalsCheck
:
public
ClangTidyCheck
{
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public
:
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PreferIsaOrDynCastInConditionalsCheck
(StringRef
Name
,
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ClangTidyContext
*Context)
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:
ClangTidyCheck
(Name, Context) {}
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void
registerMatchers
(ast_matchers::MatchFinder *Finder)
override
;
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void
check
(
const
ast_matchers::MatchFinder::MatchResult &
Result
)
override
;
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};
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}
// namespace llvm_check
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}
// namespace tidy
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}
// namespace clang
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#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_LLVM_PREFERISAORDYNCASTINCONDITIONALSCHECK_H
clang::tidy::llvm_check::PreferIsaOrDynCastInConditionalsCheck::check
void check(const ast_matchers::MatchFinder::MatchResult &Result) override
ClangTidyChecks that register ASTMatchers should do the actual work in here.
Definition:
PreferIsaOrDynCastInConditionalsCheck.cpp:70
clang::tidy::ClangTidyCheck
Base class for all clang-tidy checks.
Definition:
ClangTidyCheck.h:47
clang::tidy::llvm_check::PreferIsaOrDynCastInConditionalsCheck::registerMatchers
void registerMatchers(ast_matchers::MatchFinder *Finder) override
Override this to register AST matchers with Finder.
Definition:
PreferIsaOrDynCastInConditionalsCheck.cpp:24
clang::tidy::llvm_check::PreferIsaOrDynCastInConditionalsCheck::PreferIsaOrDynCastInConditionalsCheck
PreferIsaOrDynCastInConditionalsCheck(StringRef Name, ClangTidyContext *Context)
Definition:
PreferIsaOrDynCastInConditionalsCheck.h:53
Name
static constexpr llvm::StringLiteral Name
Definition:
UppercaseLiteralSuffixCheck.cpp:27
clang
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
Definition:
ApplyReplacements.h:27
clang::tidy::ClangTidyContext
Every ClangTidyCheck reports errors through a DiagnosticsEngine provided by this context.
Definition:
ClangTidyDiagnosticConsumer.h:99
Result
llvm::Optional< llvm::Expected< tooling::AtomicChanges > > Result
Definition:
Rename.cpp:36
clang::tidy::llvm_check::PreferIsaOrDynCastInConditionalsCheck
Looks at conditionals and finds and replaces cases of cast<>, which will assert rather than return a ...
Definition:
PreferIsaOrDynCastInConditionalsCheck.h:51
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