[clang-tidy] add new checker for string literal with NUL character.

Summary:
This patch adds the support for detecting suspicious string
literals and their //incorrect// usage.

The following example shows a incorrect character escaping leading 
to an embedded NUL character. 
```
  std::string str = "\0x42";   // Should be "\x42".
```

The patch also add detection of truncated literal when a literal
is passed to a string constructor.

Reviewers: hokein, alexfh

Subscribers: LegalizeAdulthood, bcraig, Eugene.Zelenko, bkramer, cfe-commits

Differential Revision: http://reviews.llvm.org/D18783

llvm-svn: 265691

1 files changed, 3 insertions, 0 deletions

diff --git a/clang-tools-extra/clang-tidy/misc/MiscTidyModule.cpp b/clang-tools-extra/clang-tidy/misc/MiscTidyModule.cpp
index 7dc8a217389..efbcde7245a 100644
--- a/clang-tools-extra/clang-tidy/misc/MiscTidyModule.cpp
+++ b/clang-tools-extra/clang-tidy/misc/MiscTidyModule.cpp
@@ -31,6 +31,7 @@
 #include "SizeofContainerCheck.h"
 #include "StaticAssertCheck.h"
 #include "StringIntegerAssignmentCheck.h"
+#include "StringLiteralWithEmbeddedNulCheck.h"
 #include "SuspiciousMissingCommaCheck.h"
 #include "SuspiciousSemicolonCheck.h"
 #include "SwappedArgumentsCheck.h"
@@ -89,6 +90,8 @@ public:
         "misc-static-assert");
     CheckFactories.registerCheck<StringIntegerAssignmentCheck>(
         "misc-string-integer-assignment");
+    CheckFactories.registerCheck<StringLiteralWithEmbeddedNulCheck>(
+        "misc-string-literal-with-embedded-nul");
     CheckFactories.registerCheck<SuspiciousMissingCommaCheck>(
         "misc-suspicious-missing-comma");
     CheckFactories.registerCheck<SuspiciousSemicolonCheck>(