| 1 | //===--- IntegerDivisionCheck.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 "IntegerDivisionCheck.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 IntegerDivisionCheck::registerMatchers(MatchFinder *Finder) { |
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| 17 | const auto IntType = hasType(InnerMatcher: isInteger()); |
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| 18 | |
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| 19 | const auto BinaryOperators = binaryOperator( |
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| 20 | hasAnyOperatorName("%" , "<<" , ">>" , "<<" , "^" , "|" , "&" , "||" , "&&" , "<" , |
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| 21 | ">" , "<=" , ">=" , "==" , "!=" )); |
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| 22 | |
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| 23 | const auto UnaryOperators = unaryOperator(hasAnyOperatorName("~" , "!" )); |
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| 24 | |
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| 25 | const auto Exceptions = |
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| 26 | anyOf(BinaryOperators, conditionalOperator(), binaryConditionalOperator(), |
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| 27 | callExpr(IntType), explicitCastExpr(IntType), UnaryOperators); |
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| 28 | |
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| 29 | Finder->addMatcher( |
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| 30 | NodeMatch: traverse(TK: TK_AsIs, |
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| 31 | InnerMatcher: binaryOperator( |
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| 32 | hasOperatorName(Name: "/" ), hasLHS(InnerMatcher: expr(IntType)), |
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| 33 | hasRHS(InnerMatcher: expr(IntType)), |
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| 34 | hasAncestor(castExpr(hasCastKind(Kind: CK_IntegralToFloating)) |
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| 35 | .bind(ID: "FloatCast" )), |
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| 36 | unless(hasAncestor(expr( |
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| 37 | Exceptions, |
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| 38 | hasAncestor(castExpr(equalsBoundNode(ID: "FloatCast" ))))))) |
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| 39 | .bind(ID: "IntDiv" )), |
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| 40 | Action: this); |
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| 41 | } |
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| 42 | |
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| 43 | void IntegerDivisionCheck::check(const MatchFinder::MatchResult &Result) { |
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| 44 | const auto *IntDiv = Result.Nodes.getNodeAs<BinaryOperator>(ID: "IntDiv" ); |
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| 45 | diag(Loc: IntDiv->getBeginLoc(), Description: "result of integer division used in a floating " |
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| 46 | "point context; possible loss of precision" ); |
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| 47 | } |
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| 48 | |
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| 49 | } // namespace clang::tidy::bugprone |
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| 50 | |
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