clang-tools-extra/clang-tidy/abseil/DurationDivisionCheck.cpp

   1 //===--- DurationDivisionCheck.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 "DurationDivisionCheck.h"
  10 #include "clang/AST/ASTContext.h"
  11 #include "clang/ASTMatchers/ASTMatchFinder.h"
  12 #include "clang/Lex/Lexer.h"
  13
  14 namespace clang::tidy::abseil {
  15
  16 using namespace clang::ast_matchers;
  17
  18 void DurationDivisionCheck::registerMatchers(MatchFinder *Finder) {
  19   const auto DurationExpr =
  20       expr(hasType(cxxRecordDecl(hasName("::absl::Duration"))));
  21   Finder->addMatcher(
  22       traverse(TK_AsIs,
  23                implicitCastExpr(
  24                    hasSourceExpression(ignoringParenCasts(
  25                        cxxOperatorCallExpr(hasOverloadedOperatorName("/"),
  26                                            hasArgument(0, DurationExpr),
  27                                            hasArgument(1, DurationExpr))
  28                            .bind("OpCall"))),
  29                    hasImplicitDestinationType(qualType(unless(isInteger()))),
  30                    unless(hasParent(cxxStaticCastExpr())),
  31                    unless(hasParent(cStyleCastExpr())),
  32                    unless(isInTemplateInstantiation()))),
  33       this);
  34 }
  35
  36 void DurationDivisionCheck::check(const MatchFinder::MatchResult &Result) {
  37   const auto *OpCall = Result.Nodes.getNodeAs<CXXOperatorCallExpr>("OpCall");
  38   diag(OpCall->getOperatorLoc(),
  39        "operator/ on absl::Duration objects performs integer division; "
  40        "did you mean to use FDivDuration()?")
  41       << FixItHint::CreateInsertion(OpCall->getBeginLoc(),
  42                                     "absl::FDivDuration(")
  43       << FixItHint::CreateReplacement(
  44              SourceRange(OpCall->getOperatorLoc(), OpCall->getOperatorLoc()),
  45              ", ")
  46       << FixItHint::CreateInsertion(
  47              Lexer::getLocForEndOfToken(
  48                  Result.SourceManager->getSpellingLoc(OpCall->getEndLoc()), 0,
  49                  *Result.SourceManager, Result.Context->getLangOpts()),
  50              ")");
  51 }
  52
  53 } // namespace clang::tidy::abseil