68 lines
2.3 KiB
C++
68 lines
2.3 KiB
C++
//===--- 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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/// 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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bool isLanguageVersionSupported(const LangOptions &LangOpts) const override {
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return LangOpts.CPlusPlus;
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}
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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
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