llvm-project/clang/test/Analysis/initialization.cpp

// RUN: %clang_analyze_cc1 -std=c++14 -triple i386-apple-darwin10 -analyzer-config eagerly-assume=false -analyzer-checker=core.uninitialized.Assign,core.builtin,debug.ExprInspection,core.uninitialized.UndefReturn -verify %s

template <typename T>
void clang_analyzer_dump(T x);
void clang_analyzer_eval(int);

struct S {
  int a = 3;
};
S const sarr[2] = {};
void definit() {
  int i = 1;
  // FIXME: Should recognize that it is 3.
  clang_analyzer_eval(sarr[i].a); // expected-warning{{UNKNOWN}}
}

int const glob_arr1[3] = {};
void glob_array_index1() {
  clang_analyzer_eval(glob_arr1[0] == 0); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr1[1] == 0); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr1[2] == 0); // expected-warning{{TRUE}}
}

void glob_invalid_index1() {
  const int *ptr = glob_arr1;
  int idx = -42;
  auto x = ptr[idx]; // expected-warning{{uninitialized}}
}

void glob_symbolic_index1(int idx) {
  clang_analyzer_dump(glob_arr1[idx]); // expected-warning{{Unknown}}
}

int const glob_arr2[4] = {1, 2};
void glob_ptr_index1() {
  int const *ptr = glob_arr2;
  clang_analyzer_eval(ptr[0] == 1); // expected-warning{{TRUE}}
  clang_analyzer_eval(ptr[1] == 2); // expected-warning{{TRUE}}
  clang_analyzer_eval(ptr[2] == 0); // expected-warning{{TRUE}}
  clang_analyzer_eval(ptr[3] == 0); // expected-warning{{TRUE}}
  clang_analyzer_eval(ptr[4] == 0); // expected-warning{{UNDEFINED}}
}

void glob_invalid_index2() {
  const int *ptr = glob_arr2;
  int idx = 42;
  auto x = ptr[idx]; // expected-warning{{uninitialized}}
}

const float glob_arr3[] = {
    0.0000, 0.0235, 0.0470, 0.0706, 0.0941, 0.1176};
float no_warn_garbage_value() {
  return glob_arr3[0]; // no-warning (not meaningful)
}

int const glob_arr4[4][2] = {};
void glob_array_index2() {
  clang_analyzer_eval(glob_arr4[0][0] == 0); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr4[1][0] == 0); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr4[1][1] == 0); // expected-warning{{TRUE}}
}

void glob_invalid_index3() {
  int idx = -42;
  auto x = glob_arr4[1][idx]; // expected-warning{{uninitialized}}
}

void glob_invalid_index4() {
  const int *ptr = glob_arr4[1];
  int idx = -42;
  auto x = ptr[idx]; // expected-warning{{uninitialized}}
}

int const glob_arr5[4][2] = {{1}, 3, 4, 5};
void glob_array_index3() {
  clang_analyzer_eval(glob_arr5[0][0] == 1); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr5[0][1] == 0); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr5[1][0] == 3); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr5[1][1] == 4); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr5[2][0] == 5); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr5[2][1] == 0); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr5[3][0] == 0); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr5[3][1] == 0); // expected-warning{{TRUE}}
}

void glob_ptr_index2() {
  int const *ptr = glob_arr5[1];
  clang_analyzer_eval(ptr[0] == 3); // expected-warning{{TRUE}}
  clang_analyzer_eval(ptr[1] == 4); // expected-warning{{TRUE}}
  clang_analyzer_eval(ptr[2] == 5); // expected-warning{{UNDEFINED}}
  clang_analyzer_eval(ptr[3] == 0); // expected-warning{{UNDEFINED}}
  clang_analyzer_eval(ptr[4] == 0); // expected-warning{{UNDEFINED}}
}

void glob_invalid_index5() {
  int idx = -42;
  auto x = glob_arr5[1][idx]; // expected-warning{{uninitialized}}
}

void glob_invalid_index6() {
  int const *ptr = &glob_arr5[1][0];
  int idx = 42;
  auto x = ptr[idx]; // expected-warning{{uninitialized}}
}

extern const int glob_arr_no_init[10];
void glob_array_index4() {
  clang_analyzer_eval(glob_arr_no_init[2]); // expected-warning{{UNKNOWN}}
}

struct S2 {
  static const int arr_no_init[10];
};
void struct_arr_index1() {
  clang_analyzer_eval(S2::arr_no_init[2]); // expected-warning{{UNKNOWN}}
}

char const glob_arr6[5] = "123";
void glob_array_index5() {
  clang_analyzer_eval(glob_arr6[0] == '1');  // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr6[1] == '2');  // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr6[2] == '3');  // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr6[3] == '\0'); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr6[4] == '\0'); // expected-warning{{TRUE}}
}

void glob_ptr_index3() {
  char const *ptr = glob_arr6;
  clang_analyzer_eval(ptr[-42] == '\0'); // expected-warning{{UNDEFINED}}
  clang_analyzer_eval(ptr[0] == '1');    // expected-warning{{TRUE}}
  clang_analyzer_eval(ptr[1] == '2');    // expected-warning{{TRUE}}
  clang_analyzer_eval(ptr[2] == '3');    // expected-warning{{TRUE}}
  clang_analyzer_eval(ptr[3] == '\0');   // expected-warning{{TRUE}}
  clang_analyzer_eval(ptr[4] == '\0');   // expected-warning{{TRUE}}
  clang_analyzer_eval(ptr[5] == '\0');   // expected-warning{{UNDEFINED}}
  clang_analyzer_eval(ptr[6] == '\0');   // expected-warning{{UNDEFINED}}
}

void glob_invalid_index7() {
  int idx = -42;
  auto x = glob_arr6[idx]; // expected-warning{{uninitialized}}
}

void glob_invalid_index8() {
  const char *ptr = glob_arr6;
  int idx = 42;
  auto x = ptr[idx]; // expected-warning{{uninitialized}}
}

char const glob_arr7[5] = {"123"};
void glob_array_index6() {
  clang_analyzer_eval(glob_arr7[0] == '1');  // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr7[1] == '2');  // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr7[2] == '3');  // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr7[3] == '\0'); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr7[4] == '\0'); // expected-warning{{TRUE}}
}

void glob_invalid_index9() {
  int idx = -42;
  auto x = glob_arr7[idx]; // expected-warning{{uninitialized}}
}

void glob_invalid_index10() {
  const char *ptr = glob_arr7;
  int idx = 42;
  auto x = ptr[idx]; // expected-warning{{uninitialized}}
}

char const *const glob_ptr8 = "123";
void glob_ptr_index4() {
  clang_analyzer_eval(glob_ptr8[0] == '1');  // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_ptr8[1] == '2');  // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_ptr8[2] == '3');  // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_ptr8[3] == '\0'); // expected-warning{{TRUE}}
  // FIXME: Should be UNDEFINED.
  // We should take into account a declaration in which the literal is used.
  clang_analyzer_eval(glob_ptr8[4] == '\0'); // expected-warning{{TRUE}}
}

void glob_invalid_index11() {
  int idx = -42;
  auto x = glob_ptr8[idx]; // expected-warning{{uninitialized}}
}

void glob_invalid_index12() {
  int idx = 42;
  // FIXME: Should warn {{uninitialized}}
  // We should take into account a declaration in which the literal is used.
  auto x = glob_ptr8[idx]; // no-warning
}

const char16_t *const glob_ptr9 = u"абв";
void glob_ptr_index5() {
  clang_analyzer_eval(glob_ptr9[0] == u'а'); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_ptr9[1] == u'б'); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_ptr9[2] == u'в'); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_ptr9[3] == '\0'); // expected-warning{{TRUE}}
}

const char32_t *const glob_ptr10 = U"\U0001F607\U0001F608\U0001F609";
void glob_ptr_index6() {
  clang_analyzer_eval(glob_ptr10[0] == U'\U0001F607'); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_ptr10[1] == U'\U0001F608'); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_ptr10[2] == U'\U0001F609'); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_ptr10[3] == '\0');          // expected-warning{{TRUE}}
}

const wchar_t *const glob_ptr11 = L"\123\u0041\xFF";
void glob_ptr_index7() {
  clang_analyzer_eval(glob_ptr11[0] == L'\123');   // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_ptr11[1] == L'\u0041'); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_ptr11[2] == L'\xFF');   // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_ptr11[3] == L'\0');     // expected-warning{{TRUE}}
}

const char *const glob_ptr12 = u8"abc";
void glob_ptr_index8() {
  clang_analyzer_eval(glob_ptr12[0] == 'a');  // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_ptr12[1] == 'b');  // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_ptr12[2] == 'c');  // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_ptr12[3] == '\0'); // expected-warning{{TRUE}}
}

typedef int Int;
typedef Int const CInt;
typedef CInt Arr[2];
typedef Arr Arr2[4];
Arr2 glob_arr8 = {{1}, 3, 4, 5}; // const int[4][2]
void glob_array_typedef1() {
  clang_analyzer_eval(glob_arr8[0][0] == 1); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr8[0][1] == 0); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr8[1][0] == 3); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr8[1][1] == 4); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr8[2][0] == 5); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr8[2][1] == 0); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr8[3][0] == 0); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr8[3][1] == 0); // expected-warning{{TRUE}}
}

const int glob_arr9[2][4] = {{(1), 2, ((3)), 4}, 5, 6, (((7)))};
void glob_array_parentheses1() {
  clang_analyzer_eval(glob_arr9[0][0] == 1); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr9[0][1] == 2); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr9[0][2] == 3); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr9[0][3] == 4); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr9[1][0] == 5); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr9[1][1] == 6); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr9[1][2] == 7); // expected-warning{{TRUE}}
  clang_analyzer_eval(glob_arr9[1][3] == 0); // expected-warning{{TRUE}}
}

enum class E {};
const E glob[] = {{}};
void initlistWithinInitlist() {
  // no-crash
  clang_analyzer_dump(glob[0]); // expected-warning-re {{reg_${{[0-9]+}}<enum E Element{glob,0 S64b,enum E}>}}
}