#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"

#include "clang/StaticAnalyzer/Core/Checker.h"

#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"

#include "clang/StaticAnalyzer/Frontend/CheckerRegistry.h"

using namespace clang;

using namespace ento;

namespace {

class MainCallChecker : public Checker<check::PreStmt<CallExpr>> {

  mutable std::unique_ptr<BugType> BT;

public:

  void checkPreStmt(const CallExpr *CE, CheckerContext &C) const;

};

} // end anonymous namespace

void MainCallChecker::checkPreStmt(const CallExpr *CE,

                                   CheckerContext &C) const {

  const Expr *Callee = CE->getCallee();

  const FunctionDecl *FD = C.getSVal(Callee).getAsFunctionDecl();

  if (!FD)

    return;

  // Get the name of the callee.

  IdentifierInfo *II = FD->getIdentifier();

  if (!II) // if no identifier, not a simple C function

    return;

  if (II->isStr("main")) {

    ExplodedNode *N = C.generateErrorNode();

    if (!N)

      return;

    if (!BT)

      BT.reset(new BugType(this, "call to main", "example analyzer plugin"));

    auto report =

        std::make_unique<PathSensitiveBugReport>(*BT, BT->getDescription(), N);

    report->addRange(Callee->getSourceRange());

    C.emitReport(std::move(report));

  }

}

// Register plugin!

extern "C" void clang_registerCheckers(CheckerRegistry &registry) {

  registry.addChecker<MainCallChecker>(

      "example.MainCallChecker", "Disallows calls to functions called main",

      "");

}

extern "C" const char clang_analyzerAPIVersionString[] =

    CLANG_ANALYZER_API_VERSION_STRING;