1 files changed, 58 insertions, 0 deletions
diff --git a/clang-tools-extra/clang-tidy/abseil/DurationUnnecessaryConversionCheck.cpp b/clang-tools-extra/clang-tidy/abseil/DurationUnnecessaryConversionCheck.cpp
new file mode 100644
index 00000000000..83650cd105d
--- /dev/null
+++ b/clang-tools-extra/clang-tidy/abseil/DurationUnnecessaryConversionCheck.cpp
@@ -0,0 +1,58 @@
+//===--- DurationUnnecessaryConversionCheck.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 "DurationUnnecessaryConversionCheck.h"
+#include "DurationRewriter.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+#include "clang/Tooling/FixIt.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang {
+namespace tidy {
+namespace abseil {
+
+void DurationUnnecessaryConversionCheck::registerMatchers(MatchFinder *Finder) {
+  for (const auto &Scale : {"Hours", "Minutes", "Seconds", "Milliseconds",
+                            "Microseconds", "Nanoseconds"}) {
+    std::string DurationFactory = (llvm::Twine("::absl::") + Scale).str();
+    std::string FloatConversion =
+        (llvm::Twine("::absl::ToDouble") + Scale).str();
+    std::string IntegerConversion =
+        (llvm::Twine("::absl::ToInt64") + Scale).str();
+
+    Finder->addMatcher(
+        callExpr(
+            callee(functionDecl(hasName(DurationFactory))),
+            hasArgument(0, callExpr(callee(functionDecl(hasAnyName(
+                                        FloatConversion, IntegerConversion))),
+                                    hasArgument(0, expr().bind("arg")))))
+            .bind("call"),
+        this);
+  }
+}
+
+void DurationUnnecessaryConversionCheck::check(
+    const MatchFinder::MatchResult &Result) {
+  const auto *OuterCall = Result.Nodes.getNodeAs<Expr>("call");
+  const auto *Arg = Result.Nodes.getNodeAs<Expr>("arg");
+
+  if (!isNotInMacro(Result, OuterCall))
+    return;
+
+  diag(OuterCall->getBeginLoc(), "remove unnecessary absl::Duration conversions")
+      << FixItHint::CreateReplacement(
+             OuterCall->getSourceRange(),
+             tooling::fixit::getText(*Arg, *Result.Context));
+}
+
+} // namespace abseil
+} // namespace tidy
+} // namespace clang