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;
55