| 1 | //===--- NoexceptSwapCheck.cpp - clang-tidy -------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "NoexceptSwapCheck.h" |
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| 10 | #include "clang/ASTMatchers/ASTMatchFinder.h" |
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| 11 | |
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| 12 | using namespace clang::ast_matchers; |
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| 13 | |
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| 14 | // FixItHint - comment added to fix list.rst generation in add_new_check.py. |
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| 15 | // Do not remove. Fixes are generated in base class. |
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| 16 | |
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| 17 | namespace clang::tidy::performance { |
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| 18 | |
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| 19 | void NoexceptSwapCheck::registerMatchers(MatchFinder *Finder) { |
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| 20 | |
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| 21 | // Match non-const method with single argument that is non-const reference to |
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| 22 | // a class type that owns method and return void. |
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| 23 | // Matches: void Class::swap(Class&) |
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| 24 | auto MethodMatcher = cxxMethodDecl( |
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| 25 | parameterCountIs(N: 1U), unless(isConst()), returns(InnerMatcher: voidType()), |
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| 26 | hasParameter(N: 0, InnerMatcher: hasType(InnerMatcher: qualType(hasCanonicalType( |
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| 27 | InnerMatcher: qualType(unless(isConstQualified()), |
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| 28 | references(InnerMatcher: namedDecl().bind(ID: "class" ))))))), |
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| 29 | ofClass(InnerMatcher: equalsBoundNode(ID: "class" ))); |
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| 30 | |
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| 31 | // Match function with 2 arguments, both are non-const references to same type |
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| 32 | // and return void. |
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| 33 | // Matches: void swap(Type&, Type&) |
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| 34 | auto FunctionMatcher = allOf( |
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| 35 | unless(cxxMethodDecl()), parameterCountIs(N: 2U), returns(InnerMatcher: voidType()), |
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| 36 | hasParameter( |
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| 37 | N: 0, InnerMatcher: hasType(InnerMatcher: qualType(hasCanonicalType( |
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| 38 | InnerMatcher: qualType(unless(isConstQualified()), references(InnerMatcher: qualType())) |
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| 39 | .bind(ID: "type" ))))), |
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| 40 | hasParameter(N: 1, InnerMatcher: hasType(InnerMatcher: qualType(hasCanonicalType( |
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| 41 | InnerMatcher: qualType(equalsBoundNode(ID: "type" ))))))); |
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| 42 | Finder->addMatcher(NodeMatch: functionDecl(unless(isDeleted()), |
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| 43 | hasAnyName("swap" , "iter_swap" ), |
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| 44 | anyOf(MethodMatcher, FunctionMatcher)) |
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| 45 | .bind(ID: BindFuncDeclName), |
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| 46 | Action: this); |
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| 47 | } |
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| 48 | |
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| 49 | DiagnosticBuilder |
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| 50 | NoexceptSwapCheck::reportMissingNoexcept(const FunctionDecl *FuncDecl) { |
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| 51 | return diag(FuncDecl->getLocation(), "swap functions should " |
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| 52 | "be marked noexcept" ); |
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| 53 | } |
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| 54 | |
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| 55 | void NoexceptSwapCheck::reportNoexceptEvaluatedToFalse( |
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| 56 | const FunctionDecl *FuncDecl, const Expr *NoexceptExpr) { |
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| 57 | diag(Loc: NoexceptExpr->getExprLoc(), |
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| 58 | Description: "noexcept specifier on swap function evaluates to 'false'" ); |
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| 59 | } |
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| 60 | |
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| 61 | } // namespace clang::tidy::performance |
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| 62 | |
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