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/AST/ASTContext.h"
11 #include "clang/ASTMatchers/ASTMatchFinder.h"
12
13 using namespace clang::ast_matchers;
14
15 namespace clang {
16 namespace tidy {
17 namespace bugprone {
18
registerMatchers(MatchFinder * Finder)19 void IntegerDivisionCheck::registerMatchers(MatchFinder *Finder) {
20 const auto IntType = hasType(isInteger());
21
22 const auto BinaryOperators = binaryOperator(
23 hasAnyOperatorName("%", "<<", ">>", "<<", "^", "|", "&", "||", "&&", "<",
24 ">", "<=", ">=", "==", "!="));
25
26 const auto UnaryOperators = unaryOperator(hasAnyOperatorName("~", "!"));
27
28 const auto Exceptions =
29 anyOf(BinaryOperators, conditionalOperator(), binaryConditionalOperator(),
30 callExpr(IntType), explicitCastExpr(IntType), UnaryOperators);
31
32 Finder->addMatcher(
33 traverse(ast_type_traits::TK_AsIs,
34 binaryOperator(
35 hasOperatorName("/"), hasLHS(expr(IntType)),
36 hasRHS(expr(IntType)),
37 hasAncestor(castExpr(hasCastKind(CK_IntegralToFloating))
38 .bind("FloatCast")),
39 unless(hasAncestor(expr(
40 Exceptions,
41 hasAncestor(castExpr(equalsBoundNode("FloatCast")))))))
42 .bind("IntDiv")),
43 this);
44 }
45
check(const MatchFinder::MatchResult & Result)46 void IntegerDivisionCheck::check(const MatchFinder::MatchResult &Result) {
47 const auto *IntDiv = Result.Nodes.getNodeAs<BinaryOperator>("IntDiv");
48 diag(IntDiv->getBeginLoc(), "result of integer division used in a floating "
49 "point context; possible loss of precision");
50 }
51
52 } // namespace bugprone
53 } // namespace tidy
54 } // namespace clang
55