StaticAnalyzers/src/UsingNamespace.cpp

0001 //==-- UsingNamespace.cpp - Checks for using namespace and using std:: in headers --------------*- C++ -*--==//
0002 //
0003 // by Shahzad Malik MUZAFFAR [ Shahzad.Malik.MUZAFFAR@cern.ch ]
0004 //
0005 //===----------------------------------------------------------------------===//
0006
0007 #include "UsingNamespace.h"
0008 #include "clang/Basic/SourceManager.h"
0009 #include "CmsSupport.h"
0010 using namespace clangcms;
0011
0012 void UsingNamespace::checkASTDecl(const clang::UsingDirectiveDecl *D,
0013                                   clang::ento::AnalysisManager &Mgr,
0014                                   clang::ento::BugReporter &BR) const {
0015   if (isDeclOK(D, BR))
0016     return;
0017   reportBug("'using namespace '", D, BR);
0018 }
0019
0020 void UsingNamespace::checkASTDecl(const clang::UsingDecl *D,
0021                                   clang::ento::AnalysisManager &Mgr,
0022                                   clang::ento::BugReporter &BR) const {
0023   if (isDeclOK(D, BR))
0024     return;
0025   std::string NS = D->getQualifier()->getAsNamespace()->getNameAsString();
0026   if (strcmp(NS.c_str(), "std") != 0)
0027     return;
0028   reportBug("'using std:: '", D, BR);
0029 }
0030
0031 bool UsingNamespace::isDeclOK(const clang::NamedDecl *D, clang::ento::BugReporter &BR) const {
0032   if (D->getDeclContext()->getParent() != nullptr)
0033     return true;
0034   const char *sfile = BR.getSourceManager().getPresumedLoc(D->getLocation()).getFilename();
0035   if (!support::isCmsLocalFile(sfile))
0036     return true;
0037   size_t flen = strlen(sfile);
0038   if ((sfile[flen - 2] != '.') || (sfile[flen - 1] != 'h'))
0039     return true;
0040   return false;
0041 }
0042
0043 void UsingNamespace::reportBug(const char *bug, const clang::Decl *D, clang::ento::BugReporter &BR) const {
0044   clang::ento::PathDiagnosticLocation DLoc = clang::ento::PathDiagnosticLocation::createBegin(D, BR.getSourceManager());
0045   std::string buf;
0046   llvm::raw_string_ostream os(buf);
0047   os << bug << " in headers files.";
0048   BR.EmitBasicReport(D, this, "using namespace in header files", "CMS code rules", os.str(), DLoc);
0049 }