| 1 | //===--- BitwisePointerCastCheck.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 "BitwisePointerCastCheck.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 | namespace clang::tidy::bugprone { |
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| 15 | |
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| 16 | void BitwisePointerCastCheck::registerMatchers(MatchFinder *Finder) { |
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| 17 | if (getLangOpts().CPlusPlus20) { |
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| 18 | auto IsPointerType = refersToType(InnerMatcher: qualType(isAnyPointer())); |
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| 19 | Finder->addMatcher(NodeMatch: callExpr(hasDeclaration(InnerMatcher: functionDecl(allOf( |
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| 20 | hasName(Name: "::std::bit_cast" ), |
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| 21 | hasTemplateArgument(N: 0, InnerMatcher: IsPointerType), |
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| 22 | hasTemplateArgument(N: 1, InnerMatcher: IsPointerType))))) |
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| 23 | .bind(ID: "bit_cast" ), |
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| 24 | Action: this); |
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| 25 | } |
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| 26 | |
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| 27 | auto IsDoublePointerType = |
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| 28 | hasType(InnerMatcher: qualType(pointsTo(InnerMatcher: qualType(isAnyPointer())))); |
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| 29 | Finder->addMatcher(NodeMatch: callExpr(hasArgument(N: 0, InnerMatcher: IsDoublePointerType), |
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| 30 | hasArgument(N: 1, InnerMatcher: IsDoublePointerType), |
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| 31 | hasDeclaration(InnerMatcher: functionDecl(hasName(Name: "::memcpy" )))) |
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| 32 | .bind(ID: "memcpy" ), |
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| 33 | Action: this); |
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| 34 | } |
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| 35 | |
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| 36 | void BitwisePointerCastCheck::check(const MatchFinder::MatchResult &Result) { |
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| 37 | if (const auto *Call = Result.Nodes.getNodeAs<CallExpr>(ID: "bit_cast" )) |
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| 38 | diag(Loc: Call->getBeginLoc(), |
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| 39 | Description: "do not use 'std::bit_cast' to cast between pointers" ) |
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| 40 | << Call->getSourceRange(); |
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| 41 | else if (const auto *Call = Result.Nodes.getNodeAs<CallExpr>(ID: "memcpy" )) |
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| 42 | diag(Loc: Call->getBeginLoc(), Description: "do not use 'memcpy' to cast between pointers" ) |
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| 43 | << Call->getSourceRange(); |
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| 44 | } |
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| 45 | |
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| 46 | } // namespace clang::tidy::bugprone |
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| 47 | |
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