clang-tools 20.0.0git
IntegerDivisionCheck.cpp
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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
10#include "clang/AST/ASTContext.h"
11#include "clang/ASTMatchers/ASTMatchFinder.h"
12
13using namespace clang::ast_matchers;
14
15namespace clang::tidy::bugprone {
16
17void IntegerDivisionCheck::registerMatchers(MatchFinder *Finder) {
18 const auto IntType = hasType(isInteger());
19
20 const auto BinaryOperators = binaryOperator(
21 hasAnyOperatorName("%", "<<", ">>", "<<", "^", "|", "&", "||", "&&", "<",
22 ">", "<=", ">=", "==", "!="));
23
24 const auto UnaryOperators = unaryOperator(hasAnyOperatorName("~", "!"));
25
26 const auto Exceptions =
27 anyOf(BinaryOperators, conditionalOperator(), binaryConditionalOperator(),
28 callExpr(IntType), explicitCastExpr(IntType), UnaryOperators);
29
30 Finder->addMatcher(
31 traverse(TK_AsIs,
32 binaryOperator(
33 hasOperatorName("/"), hasLHS(expr(IntType)),
34 hasRHS(expr(IntType)),
35 hasAncestor(castExpr(hasCastKind(CK_IntegralToFloating))
36 .bind("FloatCast")),
37 unless(hasAncestor(expr(
38 Exceptions,
39 hasAncestor(castExpr(equalsBoundNode("FloatCast")))))))
40 .bind("IntDiv")),
41 this);
42}
43
44void IntegerDivisionCheck::check(const MatchFinder::MatchResult &Result) {
45 const auto *IntDiv = Result.Nodes.getNodeAs<BinaryOperator>("IntDiv");
46 diag(IntDiv->getBeginLoc(), "result of integer division used in a floating "
47 "point context; possible loss of precision");
48}
49
50} // namespace clang::tidy::bugprone
DiagnosticBuilder diag(SourceLocation Loc, StringRef Description, DiagnosticIDs::Level Level=DiagnosticIDs::Warning)
Add a diagnostic with the check's name.
void registerMatchers(ast_matchers::MatchFinder *Finder) override
Override this to register AST matchers with Finder.
void check(const ast_matchers::MatchFinder::MatchResult &Result) override
ClangTidyChecks that register ASTMatchers should do the actual work in here.