clang/test/Sema/attr-nocf_check.cpp

   1 // RUN: %clang_cc1 -triple=i386-unknown-unknown -verify -fcf-protection=branch -std=c++11 -fsyntax-only %s
   2
   3 // Function pointer definition.
   4 [[gnu::nocf_check]] typedef void (*FuncPointerWithNoCfCheck)(void); // no-warning
   5 typedef void (*FuncPointer)(void);
   6
   7 // Dont allow function declaration and definition mismatch.
   8 [[gnu::nocf_check]] void testNoCfCheck();   // expected-note {{previous declaration is here}}
   9 void testNoCfCheck(){}; //  expected-error {{conflicting types for 'testNoCfCheck'}}
  10
  11 // No variable or parameter declaration
  12 int [[gnu::nocf_check]] i;                              // expected-error {{'nocf_check' attribute cannot be applied to types}}
  13 void testNoCfCheckImpl(double i [[gnu::nocf_check]]) {} // expected-warning {{'nocf_check' attribute only applies to functions and function pointers}}
  14
  15 // Allow attributed function pointers as well as casting between attributed
  16 // and non-attributed function pointers.
  17 void testNoCfCheckMismatch(FuncPointer f) {
  18   FuncPointerWithNoCfCheck fNoCfCheck = f; // expected-error {{cannot initialize a variable of type}}
  19   (*fNoCfCheck)();                         // no-warning
  20 }
  21
  22 // 'nocf_check' Attribute has no parameters.
  23 [[gnu::nocf_check(1)]] int testNoCfCheckParams(); // expected-error {{'nocf_check' attribute takes no arguments}}