clang/lib/Analysis/plugins/SampleAnalyzer/MainCallChecker.cpp

   1 #include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
   2 #include "clang/StaticAnalyzer/Core/Checker.h"
   3 #include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
   4 #include "clang/StaticAnalyzer/Frontend/CheckerRegistry.h"
   5
   6 using namespace clang;
   7 using namespace ento;
   8
   9 namespace {
  10 class MainCallChecker : public Checker<check::PreStmt<CallExpr>> {
  11   mutable std::unique_ptr<BugType> BT;
  12
  13 public:
  14   void checkPreStmt(const CallExpr *CE, CheckerContext &C) const;
  15 };
  16 } // end anonymous namespace
  17
  18 void MainCallChecker::checkPreStmt(const CallExpr *CE,
  19                                    CheckerContext &C) const {
  20   const Expr *Callee = CE->getCallee();
  21   const FunctionDecl *FD = C.getSVal(Callee).getAsFunctionDecl();
  22
  23   if (!FD)
  24     return;
  25
  26   // Get the name of the callee.
  27   IdentifierInfo *II = FD->getIdentifier();
  28   if (!II) // if no identifier, not a simple C function
  29     return;
  30
  31   if (II->isStr("main")) {
  32     ExplodedNode *N = C.generateErrorNode();
  33     if (!N)
  34       return;
  35
  36     if (!BT)
  37       BT.reset(new BugType(this, "call to main", "example analyzer plugin"));
  38
  39     auto report =
  40         std::make_unique<PathSensitiveBugReport>(*BT, BT->getDescription(), N);
  41     report->addRange(Callee->getSourceRange());
  42     C.emitReport(std::move(report));
  43   }
  44 }
  45
  46 // Register plugin!
  47 extern "C" void clang_registerCheckers(CheckerRegistry &registry) {
  48   registry.addChecker<MainCallChecker>(
  49       "example.MainCallChecker", "Disallows calls to functions called main",
  50       "");
  51 }
  52
  53 extern "C" const char clang_analyzerAPIVersionString[] =
  54     CLANG_ANALYZER_API_VERSION_STRING;