[clang-tidy] new cppcoreguidelines-narrowing-conversions check.

Summary:
Checks for narrowing conversions, e.g.

int i = 0;
i += 0.1;

This has what some might consider false positives for:
i += ceil(d);

Reviewers: alexfh, hokein

Subscribers: srhines, nemanjai, mgorny, JDevlieghere, xazax.hun, kbarton

Differential Revision: https://reviews.llvm.org/D38455

llvm-svn: 333066

1 files changed, 37 insertions, 0 deletions

diff --git a/clang-tools-extra/clang-tidy/cppcoreguidelines/NarrowingConversionsCheck.h b/clang-tools-extra/clang-tidy/cppcoreguidelines/NarrowingConversionsCheck.h
new file mode 100644
index 00000000000..35f58bc220a
--- /dev/null
+++ b/clang-tools-extra/clang-tidy/cppcoreguidelines/NarrowingConversionsCheck.h
@@ -0,0 +1,37 @@
+//===--- NarrowingConversionsCheck.h - clang-tidy----------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_CPPCOREGUIDELINES_NARROWING_CONVERSIONS_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_CPPCOREGUIDELINES_NARROWING_CONVERSIONS_H
+
+#include "../ClangTidy.h"
+
+namespace clang {
+namespace tidy {
+namespace cppcoreguidelines {
+
+/// Checks for narrowing conversions, e.g:
+///   int i = 0;
+///   i += 0.1;
+///
+/// For the user-facing documentation see:
+/// http://clang.llvm.org/extra/clang-tidy/checks/cppcoreguidelines-narrowing-conversions.html
+class NarrowingConversionsCheck : public ClangTidyCheck {
+public:
+  NarrowingConversionsCheck(StringRef Name, ClangTidyContext *Context)
+      : ClangTidyCheck(Name, Context) {}
+  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+};
+
+} // namespace cppcoreguidelines
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_CPPCOREGUIDELINES_NARROWING_CONVERSIONS_H