Add the misc-init-local-variables check.

This checks finds all primitive type local variables (integers, doubles, pointers) that are declared without an initial value. Includes fixit functionality to initialize said variables with a default value. This is zero for most types and NaN for floating point types. The use of NaNs is copied from the D programming language.

Patch by Jussi Pakkanen.

llvm-svn: 373489

1 files changed, 42 insertions, 0 deletions

diff --git a/clang-tools-extra/clang-tidy/cppcoreguidelines/InitVariablesCheck.h b/clang-tools-extra/clang-tidy/cppcoreguidelines/InitVariablesCheck.h
new file mode 100644
index 00000000000..0cacf9e533c
--- /dev/null
+++ b/clang-tools-extra/clang-tidy/cppcoreguidelines/InitVariablesCheck.h
@@ -0,0 +1,42 @@
+//===--- InitVariablesCheck.h - clang-tidy ----------------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_CPPCOREGUIDELINES_INITVARIABLESCHECK_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_CPPCOREGUIDELINES_INITVARIABLESCHECK_H
+
+#include "../ClangTidyCheck.h"
+#include "../utils/IncludeInserter.h"
+#include "../utils/OptionsUtils.h"
+
+namespace clang {
+namespace tidy {
+namespace cppcoreguidelines {
+
+/// Find uninitialized local variables.
+///
+/// For the user-facing documentation see:
+/// http://clang.llvm.org/extra/clang-tidy/checks/cppcoreguidelines-init-variables.html
+class InitVariablesCheck : public ClangTidyCheck {
+public:
+  InitVariablesCheck(StringRef Name, ClangTidyContext *Context);
+  void registerPPCallbacks(const SourceManager &SM, Preprocessor *PP,
+                           Preprocessor *ModuleExpanderPP) override;
+  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+
+private:
+  std::unique_ptr<clang::tidy::utils::IncludeInserter> IncludeInserter;
+  const utils::IncludeSorter::IncludeStyle IncludeStyle;
+  const std::string MathHeader;
+};
+
+} // namespace cppcoreguidelines
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_CPPCOREGUIDELINES_INITVARIABLESCHECK_H