+/// getMainFunction - This function looks up main efficiently. This is such a
+/// common case, that it is a method in Module. If main cannot be found, a
+/// null pointer is returned.
+///
+Function *Module::getMainFunction() {
+ std::vector<const Type*> Params;
+
+ // int main(void)...
+ if (Function *F = getFunction("main", FunctionType::get(Type::IntTy,
+ Params, false)))
+ return F;
+
+ // void main(void)...
+ if (Function *F = getFunction("main", FunctionType::get(Type::VoidTy,
+ Params, false)))
+ return F;
+
+ Params.push_back(Type::IntTy);
+
+ // int main(int argc)...
+ if (Function *F = getFunction("main", FunctionType::get(Type::IntTy,
+ Params, false)))
+ return F;
+
+ // void main(int argc)...
+ if (Function *F = getFunction("main", FunctionType::get(Type::VoidTy,
+ Params, false)))
+ return F;
+
+ for (unsigned i = 0; i != 2; ++i) { // Check argv and envp
+ Params.push_back(PointerType::get(PointerType::get(Type::SByteTy)));
+
+ // int main(int argc, char **argv)...
+ if (Function *F = getFunction("main", FunctionType::get(Type::IntTy,
+ Params, false)))
+ return F;
+
+ // void main(int argc, char **argv)...
+ if (Function *F = getFunction("main", FunctionType::get(Type::VoidTy,
+ Params, false)))
+ return F;
+ }
+
+ // Ok, try to find main the hard way...
+ return getNamedFunction("main");