clang/test/Analysis/builtin-functions.cpp

   1 // RUN: %clang_analyze_cc1 -triple x86_64-apple-darwin10 -analyzer-checker=core,debug.ExprInspection %s -std=c++11 -verify
   2 // RUN: %clang_analyze_cc1 -triple x86_64-pc-windows-msvc19.11.0 -fms-extensions -analyzer-checker=core,debug.ExprInspection %s -std=c++11 -verify
   3
   4 #include "Inputs/system-header-simulator-cxx.h"
   5
   6 namespace std {
   7 // Intentionally not using an "auto" return type here, as such must also have a definition.
   8 template <typename T, typename U> constexpr int&& forward_like(U&& x) noexcept;
   9 template <typename T> const T& move_if_noexcept(T& x) noexcept;
  10 } // namespace std
  11
  12 template <typename T> void clang_analyzer_dump_ref(T&&);
  13 template <typename T> void clang_analyzer_dump_ptr(T*);
  14 void clang_analyzer_eval(bool);
  15 void clang_analyzer_warnIfReached();
  16
  17 void testAddressof(int x) {
  18   clang_analyzer_eval(&x == __builtin_addressof(x)); // expected-warning{{TRUE}}
  19 }
  20
  21 void testStdBuiltinLikeFunctions(int x) {
  22   clang_analyzer_dump_ptr(std::addressof(x));           // expected-warning{{&x}}
  23   clang_analyzer_dump_ptr(std::__addressof(x));         // expected-warning{{&x}}
  24   clang_analyzer_dump_ref(std::as_const(x));            // expected-warning{{&x}}
  25   clang_analyzer_dump_ref(std::forward<int &>(x));      // expected-warning{{&x}}
  26   clang_analyzer_dump_ref(std::forward_like<int &>(x)); // expected-warning{{&x}}
  27   clang_analyzer_dump_ref(std::move(x));                // expected-warning{{&x}}
  28   clang_analyzer_dump_ref(std::move_if_noexcept(x));    // expected-warning{{&x}}
  29 }
  30
  31 void testSize() {
  32   struct {
  33     int x;
  34     int y;
  35     char z;
  36   } object;
  37   clang_analyzer_eval(__builtin_object_size(&object.y, 0) == sizeof(object) - sizeof(int)); // expected-warning{{TRUE}}
  38
  39   // Clang can't actually evaluate these builtin "calls", but importantly they don't actually evaluate the argument expression either.
  40   int i = 0;
  41   char buf[10];
  42   clang_analyzer_eval(__builtin_object_size(&buf[i++], 0) == sizeof(buf)); // expected-warning{{FALSE}}
  43   clang_analyzer_eval(__builtin_object_size(&buf[++i], 0) == sizeof(buf) - 1); // expected-warning{{FALSE}}
  44
  45   clang_analyzer_eval(i == 0); // expected-warning{{TRUE}}
  46 }
  47
  48 void test_assume_aligned_1(char *p) {
  49   char *q;
  50
  51   q = (char*) __builtin_assume_aligned(p, 16);
  52   clang_analyzer_eval(p == q); // expected-warning{{TRUE}}
  53 }
  54
  55 void test_assume_aligned_2(char *p) {
  56   char *q;
  57
  58   q = (char*) __builtin_assume_aligned(p, 16, 8);
  59   clang_analyzer_eval(p == q); // expected-warning{{TRUE}}
  60 }
  61
  62 void test_assume_aligned_3(char *p) {
  63   void *q;
  64
  65   q = __builtin_assume_aligned(p, 16, 8);
  66   clang_analyzer_eval(p == q); // expected-warning{{TRUE}}
  67 }
  68
  69 void test_assume_aligned_4(char *p) {
  70   char *q;
  71
  72   q = (char*) __builtin_assume_aligned(p + 1, 16);
  73   clang_analyzer_eval(p == q); // expected-warning{{FALSE}}
  74 }
  75
  76 void f(int i) {
  77   __builtin_assume(i < 10);
  78   clang_analyzer_eval(i < 15); // expected-warning {{TRUE}}
  79 }
  80
  81 void g(int i) {
  82   if (i > 5) {
  83     __builtin_assume(i < 5);
  84     clang_analyzer_warnIfReached(); // Assumtion contradicts constraints.
  85                                     // We give up the analysis on this path.
  86   }
  87 }
  88
  89 #ifdef _WIN32
  90 namespace ms {
  91 void f(int i) {
  92   __assume(i < 10);
  93   clang_analyzer_eval(i < 15); // expected-warning {{TRUE}}
  94 }
  95
  96 void g(int i) {
  97   if (i > 5) {
  98     __assume(i < 5);
  99     clang_analyzer_warnIfReached(); // Assumtion contradicts constraints.
 100                                     // We give up the analysis on this path.
 101   }
 102 }
 103 } // namespace ms
 104 #endif
 105
 106 void test_constant_p(void *ptr) {
 107   int i = 1;
 108   const int j = 2;
 109   constexpr int k = 3;
 110   clang_analyzer_eval(__builtin_constant_p(42) == 1); // expected-warning {{TRUE}}
 111   clang_analyzer_eval(__builtin_constant_p(i) == 0); // expected-warning {{TRUE}}
 112   clang_analyzer_eval(__builtin_constant_p(j) == 1); // expected-warning {{TRUE}}
 113   clang_analyzer_eval(__builtin_constant_p(k) == 1); // expected-warning {{TRUE}}
 114   clang_analyzer_eval(__builtin_constant_p(i + 42) == 0); // expected-warning {{TRUE}}
 115   clang_analyzer_eval(__builtin_constant_p(j + 42) == 1); // expected-warning {{TRUE}}
 116   clang_analyzer_eval(__builtin_constant_p(k + 42) == 1); // expected-warning {{TRUE}}
 117   clang_analyzer_eval(__builtin_constant_p(" ") == 1); // expected-warning {{TRUE}}
 118   clang_analyzer_eval(__builtin_constant_p(test_constant_p) == 0); // expected-warning {{TRUE}}
 119   clang_analyzer_eval(__builtin_constant_p(k - 3) == 0); // expected-warning {{FALSE}}
 120   clang_analyzer_eval(__builtin_constant_p(k - 3) == 1); // expected-warning {{TRUE}}
 121   clang_analyzer_eval(__builtin_constant_p(ptr == 0)); // expected-warning {{FALSE}}
 122 }