68 lines
2.7 KiB
C
68 lines
2.7 KiB
C
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//===--- UnnecessaryCopyInitialization.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_PERFORMANCE_UNNECESSARY_COPY_INITIALIZATION_H
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#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_PERFORMANCE_UNNECESSARY_COPY_INITIALIZATION_H
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#include "../ClangTidyCheck.h"
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#include "clang/AST/Decl.h"
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namespace clang::tidy::performance {
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// The check detects local variable declarations that are copy initialized with
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// the const reference of a function call or the const reference of a method
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// call whose object is guaranteed to outlive the variable's scope and suggests
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// to use a const reference.
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//
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// The check currently only understands a subset of variables that are
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// guaranteed to outlive the const reference returned, namely: const variables,
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// const references, and const pointers to const.
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class UnnecessaryCopyInitialization : public ClangTidyCheck {
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public:
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UnnecessaryCopyInitialization(StringRef Name, ClangTidyContext *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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void storeOptions(ClangTidyOptions::OptionMap &Opts) override;
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protected:
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// A helper to manipulate the state common to
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// `CopyFromMethodReturn` and `CopyFromLocalVar`.
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struct CheckContext {
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const VarDecl &Var;
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const Stmt &BlockStmt;
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const DeclStmt &VarDeclStmt;
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clang::ASTContext &ASTCtx;
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const bool IssueFix;
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const bool IsVarUnused;
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const bool IsVarOnlyUsedAsConst;
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};
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// Create diagnostics. These are virtual so that derived classes can change
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// behaviour.
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virtual void diagnoseCopyFromMethodReturn(const CheckContext &Ctx);
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virtual void diagnoseCopyFromLocalVar(const CheckContext &Ctx,
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const VarDecl &OldVar);
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private:
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void handleCopyFromMethodReturn(const CheckContext &Ctx,
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const VarDecl *ObjectArg);
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void handleCopyFromLocalVar(const CheckContext &Ctx, const VarDecl &OldVar);
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void maybeIssueFixes(const CheckContext &Ctx, DiagnosticBuilder &Diagnostic);
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const std::vector<StringRef> AllowedTypes;
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const std::vector<StringRef> ExcludedContainerTypes;
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};
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} // namespace clang::tidy::performance
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#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_PERFORMANCE_UNNECESSARY_COPY_INITIALIZATION_H
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