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
6using namespace clang;
7using namespace ento;
8
9namespace {
10class MainCallChecker : public Checker<check::PreStmt<CallExpr>> {
11  mutable std::unique_ptr<BugType> BT;
12
13public:
14  void checkPreStmt(const CallExpr *CE, CheckerContext &C) const;
15};
16} // end anonymous namespace
17
18void 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!
47extern "C" void clang_registerCheckers(CheckerRegistry &registry) {
48  registry.addChecker<MainCallChecker>(
49      "example.MainCallChecker", "Disallows calls to functions called main",
50      "");
51}
52
53extern "C" const char clang_analyzerAPIVersionString[] =
54    CLANG_ANALYZER_API_VERSION_STRING;
55