[clang-tidy] Add bugprone-suspicious-memset-usage check

Created new module bugprone and placed the check in that.

Finds memset() calls with potential mistakes in their arguments.
Replaces and extends the existing google-runtime-memset-zero-length check.

Cases covered:
* Fill value is a character '0'. Integer 0 might have been intended.
* Fill value is out of char range and gets truncated.
* Byte count is zero. Potentially swapped with the fill value argument.

Patch by: Reka Nikolett Kovacs

Differential Revision: https://reviews.llvm.org/D32700

llvm-svn: 308020

1 files changed, 38 insertions, 0 deletions

diff --git a/clang-tools-extra/clang-tidy/bugprone/BugproneTidyModule.cpp b/clang-tools-extra/clang-tidy/bugprone/BugproneTidyModule.cpp
new file mode 100644
index 00000000000..65353a23c7a
--- /dev/null
+++ b/clang-tools-extra/clang-tidy/bugprone/BugproneTidyModule.cpp
@@ -0,0 +1,38 @@
+//===--- BugproneTidyModule.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 "../ClangTidy.h"
+#include "../ClangTidyModule.h"
+#include "../ClangTidyModuleRegistry.h"
+#include "SuspiciousMemsetUsageCheck.h"
+
+namespace clang {
+namespace tidy {
+namespace bugprone {
+
+class BugproneModule : public ClangTidyModule {
+public:
+  void addCheckFactories(ClangTidyCheckFactories &CheckFactories) override {
+    CheckFactories.registerCheck<SuspiciousMemsetUsageCheck>(
+        "bugprone-suspicious-memset-usage");
+  }
+};
+
+} // namespace bugprone
+
+// Register the BugproneTidyModule using this statically initialized variable.
+static ClangTidyModuleRegistry::Add<bugprone::BugproneModule>
+    X("bugprone-module", "Adds checks for bugprone code constructs.");
+
+// This anchor is used to force the linker to link in the generated object file
+// and thus register the BugproneModule.
+volatile int BugproneModuleAnchorSource = 0;
+
+} // namespace tidy
+} // namespace clang