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//===--- IntegerDivisionCheck.cpp - clang-tidy-----------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "IntegerDivisionCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
namespace bugprone {
void IntegerDivisionCheck::registerMatchers(MatchFinder *Finder) {
const auto IntType = hasType(isInteger());
const auto BinaryOperators = binaryOperator(anyOf(
hasOperatorName("%"), hasOperatorName("<<"), hasOperatorName(">>"),
hasOperatorName("<<"), hasOperatorName("^"), hasOperatorName("|"),
hasOperatorName("&"), hasOperatorName("||"), hasOperatorName("&&"),
hasOperatorName("<"), hasOperatorName(">"), hasOperatorName("<="),
hasOperatorName(">="), hasOperatorName("=="), hasOperatorName("!=")));
const auto UnaryOperators =
unaryOperator(anyOf(hasOperatorName("~"), hasOperatorName("!")));
const auto Exceptions =
anyOf(BinaryOperators, conditionalOperator(), binaryConditionalOperator(),
callExpr(IntType), explicitCastExpr(IntType), UnaryOperators);
Finder->addMatcher(
binaryOperator(
hasOperatorName("/"), hasLHS(expr(IntType)), hasRHS(expr(IntType)),
hasAncestor(
castExpr(hasCastKind(CK_IntegralToFloating)).bind("FloatCast")),
unless(hasAncestor(
expr(Exceptions,
hasAncestor(castExpr(equalsBoundNode("FloatCast")))))))
.bind("IntDiv"),
this);
}
void IntegerDivisionCheck::check(const MatchFinder::MatchResult &Result) {
const auto *IntDiv = Result.Nodes.getNodeAs<BinaryOperator>("IntDiv");
diag(IntDiv->getBeginLoc(), "result of integer division used in a floating "
"point context; possible loss of precision");
}
} // namespace bugprone
} // namespace tidy
} // namespace clang
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