| 1 | //===--- IntegerDivisionCheck.cpp - clang-tidy-----------------------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #include "IntegerDivisionCheck.h" |
| 10 | #include "clang/ASTMatchers/ASTMatchFinder.h" |
| 11 | |
| 12 | using namespace clang::ast_matchers; |
| 13 | |
| 14 | namespace clang::tidy::bugprone { |
| 15 | |
| 16 | void IntegerDivisionCheck::registerMatchers(MatchFinder *Finder) { |
| 17 | const auto IntType = hasType(InnerMatcher: isInteger()); |
| 18 | |
| 19 | const auto BinaryOperators = binaryOperator( |
| 20 | hasAnyOperatorName("%", "<<", ">>", "<<", "^", "|", "&", "||", "&&", "<", |
| 21 | ">", "<=", ">=", "==", "!=")); |
| 22 | |
| 23 | const auto UnaryOperators = unaryOperator(hasAnyOperatorName("~", "!")); |
| 24 | |
| 25 | const auto Exceptions = |
| 26 | anyOf(BinaryOperators, conditionalOperator(), binaryConditionalOperator(), |
| 27 | callExpr(IntType), explicitCastExpr(IntType), UnaryOperators); |
| 28 | |
| 29 | Finder->addMatcher( |
| 30 | NodeMatch: traverse(TK: TK_AsIs, |
| 31 | InnerMatcher: binaryOperator( |
| 32 | hasOperatorName(Name: "/"), hasLHS(InnerMatcher: expr(IntType)), |
| 33 | hasRHS(InnerMatcher: expr(IntType)), |
| 34 | hasAncestor(castExpr(hasCastKind(Kind: CK_IntegralToFloating)) |
| 35 | .bind(ID: "FloatCast")), |
| 36 | unless(hasAncestor(expr( |
| 37 | Exceptions, |
| 38 | hasAncestor(castExpr(equalsBoundNode(ID: "FloatCast"))))))) |
| 39 | .bind(ID: "IntDiv")), |
| 40 | Action: this); |
| 41 | } |
| 42 | |
| 43 | void IntegerDivisionCheck::check(const MatchFinder::MatchResult &Result) { |
| 44 | const auto *IntDiv = Result.Nodes.getNodeAs<BinaryOperator>(ID: "IntDiv"); |
| 45 | diag(Loc: IntDiv->getBeginLoc(), Description: "result of integer division used in a floating " |
| 46 | "point context; possible loss of precision"); |
| 47 | } |
| 48 | |
| 49 | } // namespace clang::tidy::bugprone |
| 50 |