clang/test/Analysis/initialization.c

   1 // RUN: %clang_cc1 -triple i386-apple-darwin10 -analyze -analyzer-config eagerly-assume=false  -analyzer-checker=core.uninitialized.Assign,debug.ExprInspection -verify %s
   2
   3 void clang_analyzer_eval(int);
   4
   5 void initbug(void) {
   6   const union { float a; } u = {};
   7   (void)u.a; // no-crash
   8 }
   9
  10 int const parr[2] = {1};
  11 void constarr(void) {
  12   int i = 2;
  13   clang_analyzer_eval(parr[i]); // expected-warning{{UNDEFINED}}
  14   i = 1;
  15   clang_analyzer_eval(parr[i] == 0); // expected-warning{{TRUE}}
  16   i = -1;
  17   clang_analyzer_eval(parr[i]); // expected-warning{{UNDEFINED}}
  18 }
  19
  20 struct SM {
  21   int a;
  22   int b;
  23 };
  24 const struct SM sm = {.a = 1};
  25 void multinit(void) {
  26   clang_analyzer_eval(sm.a == 1); // expected-warning{{TRUE}}
  27   clang_analyzer_eval(sm.b == 0); // expected-warning{{TRUE}}
  28 }
  29
  30 const int glob_arr1[6] = {[2] = 3, [0] = 1, [1] = 2, [3] = 4};
  31 void glob_array_index1(void) {
  32   clang_analyzer_eval(glob_arr1[0] == 1); // expected-warning{{TRUE}}
  33   clang_analyzer_eval(glob_arr1[1] == 2); // expected-warning{{TRUE}}
  34   clang_analyzer_eval(glob_arr1[2] == 3); // expected-warning{{TRUE}}
  35   clang_analyzer_eval(glob_arr1[3] == 4); // expected-warning{{TRUE}}
  36   clang_analyzer_eval(glob_arr1[4] == 0); // expected-warning{{TRUE}}
  37   clang_analyzer_eval(glob_arr1[5] == 0); // expected-warning{{TRUE}}
  38 }
  39
  40 void glob_array_index2(void) {
  41   const int *ptr = glob_arr1;
  42   clang_analyzer_eval(ptr[0] == 1); // expected-warning{{TRUE}}
  43   clang_analyzer_eval(ptr[1] == 2); // expected-warning{{TRUE}}
  44   clang_analyzer_eval(ptr[2] == 3); // expected-warning{{TRUE}}
  45   clang_analyzer_eval(ptr[3] == 4); // expected-warning{{TRUE}}
  46   clang_analyzer_eval(ptr[4] == 0); // expected-warning{{TRUE}}
  47   clang_analyzer_eval(ptr[5] == 0); // expected-warning{{TRUE}}
  48 }
  49
  50 void glob_invalid_index1(void) {
  51   int x = -42;
  52   int res = glob_arr1[x]; // expected-warning{{garbage or undefined}}
  53 }
  54
  55 void glob_invalid_index2(void) {
  56   const int *ptr = glob_arr1;
  57   int x = 42;
  58   int res = ptr[x]; // expected-warning{{garbage or undefined}}
  59 }
  60
  61 const int glob_arr2[3][3] = {[0][0] = 1, [1][1] = 5, [2][0] = 7};
  62 void glob_arr_index3(void) {
  63   clang_analyzer_eval(glob_arr2[0][0] == 1); // expected-warning{{TRUE}}
  64   clang_analyzer_eval(glob_arr2[0][1] == 0); // expected-warning{{TRUE}}
  65   clang_analyzer_eval(glob_arr2[0][2] == 0); // expected-warning{{TRUE}}
  66   clang_analyzer_eval(glob_arr2[1][0] == 0); // expected-warning{{TRUE}}
  67   clang_analyzer_eval(glob_arr2[1][1] == 5); // expected-warning{{TRUE}}
  68   clang_analyzer_eval(glob_arr2[1][2] == 0); // expected-warning{{TRUE}}
  69   clang_analyzer_eval(glob_arr2[2][0] == 7); // expected-warning{{TRUE}}
  70   clang_analyzer_eval(glob_arr2[2][1] == 0); // expected-warning{{TRUE}}
  71   clang_analyzer_eval(glob_arr2[2][2] == 0); // expected-warning{{TRUE}}
  72 }
  73
  74 void negative_index(void) {
  75   int x = 2, y = -2;
  76   clang_analyzer_eval(glob_arr2[x][y] == 5); // expected-warning{{UNDEFINED}}
  77   x = 3;
  78   y = -3;
  79   clang_analyzer_eval(glob_arr2[x][y] == 7); // expected-warning{{UNDEFINED}}
  80 }
  81
  82 void glob_invalid_index3(void) {
  83   int x = -1, y = -1;
  84   int res = glob_arr2[x][y]; // expected-warning{{garbage or undefined}}
  85 }
  86
  87 void glob_invalid_index4(void) {
  88   int x = 3, y = 2;
  89   int res = glob_arr2[x][y]; // expected-warning{{garbage or undefined}}
  90 }
  91
  92 const int glob_arr_no_init[10];
  93 void glob_arr_index4(void) {
  94   // FIXME: Should warn {{FALSE}}, since the array has a static storage.
  95   clang_analyzer_eval(glob_arr_no_init[2]); // expected-warning{{UNKNOWN}}
  96 }
  97
  98 const int glob_arr3[];              // IncompleteArrayType
  99 const int glob_arr3[4] = {1, 2, 3}; // ConstantArrayType
 100 void glob_arr_index5(void) {
 101   clang_analyzer_eval(glob_arr3[0] == 1); // expected-warning{{TRUE}}
 102   clang_analyzer_eval(glob_arr3[1] == 2); // expected-warning{{TRUE}}
 103   clang_analyzer_eval(glob_arr3[2] == 3); // expected-warning{{TRUE}}
 104   clang_analyzer_eval(glob_arr3[3] == 0); // expected-warning{{TRUE}}
 105 }
 106
 107 void glob_invalid_index5(void) {
 108   int x = 42;
 109   int res = glob_arr3[x]; // expected-warning{{garbage or undefined}}
 110 }
 111
 112 void glob_invalid_index6(void) {
 113   int x = -42;
 114   int res = glob_arr3[x]; // expected-warning{{garbage or undefined}}
 115 }
 116
 117 const int glob_arr4[];              // IncompleteArrayType
 118 const int glob_arr4[4] = {1, 2, 3}; // ConstantArrayType
 119 const int glob_arr4[];              // ConstantArrayType (according to AST)
 120 void glob_arr_index6(void) {
 121   clang_analyzer_eval(glob_arr4[0] == 1); // expected-warning{{TRUE}}
 122   clang_analyzer_eval(glob_arr4[1] == 2); // expected-warning{{TRUE}}
 123   clang_analyzer_eval(glob_arr4[2] == 3); // expected-warning{{TRUE}}
 124   clang_analyzer_eval(glob_arr4[3] == 0); // expected-warning{{TRUE}}
 125 }
 126
 127 void glob_invalid_index7(void) {
 128   int x = 42;
 129   int res = glob_arr4[x]; // expected-warning{{garbage or undefined}}
 130 }
 131
 132 void glob_invalid_index8(void) {
 133   int x = -42;
 134   int res = glob_arr4[x]; // expected-warning{{garbage or undefined}}
 135 }