1 files changed, 59 insertions, 0 deletions
diff --git a/clang-tools-extra/clang-tidy/abseil/DurationDivisionCheck.cpp b/clang-tools-extra/clang-tidy/abseil/DurationDivisionCheck.cpp
new file mode 100644
index 00000000000..5edc15875eb
--- /dev/null
+++ b/clang-tools-extra/clang-tidy/abseil/DurationDivisionCheck.cpp
@@ -0,0 +1,59 @@
+//===--- DurationDivisionCheck.cpp - clang-tidy----------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "DurationDivisionCheck.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+
+namespace clang {
+namespace tidy {
+namespace abseil {
+
+using namespace clang::ast_matchers;
+
+void DurationDivisionCheck::registerMatchers(MatchFinder *finder) {
+  if (!getLangOpts().CPlusPlus)
+    return;
+
+  const auto DurationExpr =
+      expr(hasType(cxxRecordDecl(hasName("::absl::Duration"))));
+  finder->addMatcher(
+      implicitCastExpr(
+          hasSourceExpression(ignoringParenCasts(
+              cxxOperatorCallExpr(hasOverloadedOperatorName("/"),
+                                  hasArgument(0, DurationExpr),
+                                  hasArgument(1, DurationExpr))
+                  .bind("OpCall"))),
+          hasImplicitDestinationType(qualType(unless(isInteger()))),
+          unless(hasParent(cxxStaticCastExpr())),
+          unless(hasParent(cStyleCastExpr())),
+          unless(isInTemplateInstantiation())),
+      this);
+}
+
+void DurationDivisionCheck::check(const MatchFinder::MatchResult &result) {
+  const auto *OpCall = result.Nodes.getNodeAs<CXXOperatorCallExpr>("OpCall");
+  diag(OpCall->getOperatorLoc(),
+       "operator/ on absl::Duration objects performs integer division; "
+       "did you mean to use FDivDuration()?")
+      << FixItHint::CreateInsertion(OpCall->getBeginLoc(),
+                                    "absl::FDivDuration(")
+      << FixItHint::CreateReplacement(
+             SourceRange(OpCall->getOperatorLoc(), OpCall->getOperatorLoc()),
+             ", ")
+      << FixItHint::CreateInsertion(
+             Lexer::getLocForEndOfToken(
+                 result.SourceManager->getSpellingLoc(OpCall->getEndLoc()), 0,
+                 *result.SourceManager, result.Context->getLangOpts()),
+             ")");
+}
+
+} // namespace abseil
+} // namespace tidy
+} // namespace clang