// RUN: %clang_cc1 -verify -std=c++14 %s
int foo() {
int x[2]; // expected-note 4 {{array 'x' declared here}}
int y[2]; // expected-note 2 {{array 'y' declared here}}
int z[1]; // expected-note {{array 'z' declared here}}
int w[1][1]; // expected-note {{array 'w' declared here}}
int v[1][1][1]; // expected-note {{array 'v' declared here}}
int *p = &y[2]; // no-warning
(void) sizeof(x[2]); // no-warning
y[2] = 2; // expected-warning {{array index 2 is past the end of the array (that has type 'int[2]')}}
z[1] = 'x'; // expected-warning {{array index 1 is past the end of the array (that has type 'int[1]')}}
w[0][2] = 0; // expected-warning {{array index 2 is past the end of the array (that has type 'int[1]')}}
v[0][0][2] = 0; // expected-warning {{array index 2 is past the end of the array (that has type 'int[1]')}}
return x[2] + // expected-warning {{array index 2 is past the end of the array (that has type 'int[2]')}}
y[-1] + // expected-warning {{array index -1 is before the beginning of the array}}
x[sizeof(x)] + // expected-warning {{array index 8 is past the end of the array (that has type 'int[2]')}}
x[sizeof(x) / sizeof(x[0])] + // expected-warning {{array index 2 is past the end of the array (that has type 'int[2]')}}
x[sizeof(x) / sizeof(x[0]) - 1] + // no-warning
x[sizeof(x[2])]; // expected-warning {{array index 4 is past the end of the array (that has type 'int[2]')}}
}
// This code example tests that -Warray-bounds works with arrays that
// are template parameters.
template <char *sz> class Qux {
bool test() { return sz[0] == 'a'; }
};
void f1(int a[1]) {
int val = a[3]; // no warning for function argumnet
}
void f2(const int (&a)[2]) { // expected-note {{declared here}}
int val = a[3]; // expected-warning {{array index 3 is past the end of the array (that has type 'const int[2]')}}
}
void test() {
struct {
int a[0];
} s2;
s2.a[3] = 0; // no warning for 0-sized array
union {
short a[2]; // expected-note 4 {{declared here}}
char c[4];
} u;
u.a[3] = 1; // expected-warning {{array index 3 is past the end of the array (that has type 'short[2]')}}
u.c[3] = 1; // no warning
short *p = &u.a[2]; // no warning
p = &u.a[3]; // expected-warning {{array index 3 is past the end of the array (that has type 'short[2]')}}
*(&u.a[2]) = 1; // expected-warning {{array index 2 is past the end of the array (that has type 'short[2]')}}
*(&u.a[3]) = 1; // expected-warning {{array index 3 is past the end of the array (that has type 'short[2]')}}
*(&u.c[3]) = 1; // no warning
const int const_subscript = 3;
int array[2]; // expected-note {{declared here}}
array[const_subscript] = 0; // expected-warning {{array index 3 is past the end of the array (that has type 'int[2]')}}
int *ptr;
ptr[3] = 0; // no warning for pointer references
int array2[] = { 0, 1, 2 }; // expected-note 2 {{declared here}}
array2[3] = 0; // expected-warning {{array index 3 is past the end of the array (that has type 'int[3]')}}
array2[2+2] = 0; // expected-warning {{array index 4 is past the end of the array (that has type 'int[3]')}}
const char *str1 = "foo";
char c1 = str1[5]; // no warning for pointers
const char str2[] = "foo"; // expected-note {{declared here}}
char c2 = str2[5]; // expected-warning {{array index 5 is past the end of the array (that has type 'const char[4]')}}
int (*array_ptr)[2];
(*array_ptr)[3] = 1; // expected-warning {{array index 3 is past the end of the array (that has type 'int[2]')}}
}
template <int I> struct S {
char arr[I]; // expected-note 3 {{declared here}}
};
template <int I> void f() {
S<3> s;
s.arr[4] = 0; // expected-warning 2 {{array index 4 is past the end of the array (that has type 'char[3]')}}
s.arr[I] = 0; // expected-warning {{array index 5 is past the end of the array (that has type 'char[3]')}}
}
void test_templates() {
f<5>(); // expected-note {{in instantiation}}
}
#define SIZE 10
#define ARR_IN_MACRO(flag, arr, idx) flag ? arr[idx] : 1
int test_no_warn_macro_unreachable() {
int arr[SIZE]; // expected-note {{array 'arr' declared here}}
return ARR_IN_MACRO(0, arr, SIZE) + // no-warning
ARR_IN_MACRO(1, arr, SIZE); // expected-warning{{array index 10 is past the end of the array (that has type 'int[10]')}}
}
// This exhibited an assertion failure for a 32-bit build of Clang.
int test_pr9240() {
short array[100]; // expected-note {{array 'array' declared here}}
return array[(unsigned long long) 100]; // expected-warning {{array index 100 is past the end of the array (that has type 'short[100]')}}
}
// PR 9284 - a template parameter can cause an array bounds access to be
// infeasible.
template <bool extendArray>
void pr9284() {
int arr[3 + (extendArray ? 1 : 0)];
if (extendArray)
arr[3] = 42; // no-warning
}
template <bool extendArray>
void pr9284b() {
int arr[3 + (extendArray ? 1 : 0)]; // expected-note {{array 'arr' declared here}}
if (!extendArray)
arr[3] = 42; // expected-warning{{array index 3 is past the end of the array (that has type 'int[3]')}}
}
void test_pr9284() {
pr9284<true>();
pr9284<false>();
pr9284b<true>();
pr9284b<false>(); // expected-note{{in instantiation of function template specialization 'pr9284b<false>' requested here}}
}
int test_pr9296() {
int array[2];
return array[true]; // no-warning
}
int test_sizeof_as_condition(int flag) {
int arr[2] = { 0, 0 }; // expected-note {{array 'arr' declared here}}
if (flag)
return sizeof(char) != sizeof(char) ? arr[2] : arr[1];
return sizeof(char) == sizeof(char) ? arr[2] : arr[1]; // expected-warning {{array index 2 is past the end of the array (that has type 'int[2]')}}
}
void test_switch() {
switch (4) {
case 1: {
int arr[2];
arr[2] = 1; // no-warning
break;
}
case 4: {
int arr[2]; // expected-note {{array 'arr' declared here}}
arr[2] = 1; // expected-warning {{array index 2 is past the end of the array (that has type 'int[2]')}}
break;
}
default: {
int arr[2];
arr[2] = 1; // no-warning
break;
}
}
}
// Test nested switch statements.
enum enumA { enumA_A, enumA_B, enumA_C, enumA_D, enumA_E };
enum enumB { enumB_X, enumB_Y, enumB_Z };
static enum enumB myVal = enumB_X;
void test_nested_switch() {
switch (enumA_E) { // expected-warning {{no case matching constant}}
switch (myVal) { // expected-warning {{enumeration values 'enumB_X' and 'enumB_Z' not handled in switch}}
case enumB_Y: ;
}
}
}
// Test that if all the values of an enum covered, that the 'default' branch
// is unreachable.
enum Values { A, B, C, D };
void test_all_enums_covered(enum Values v) {
int x[2];
switch (v) {
case A: return;
case B: return;
case C: return;
case D: return;
}
x[2] = 0; // no-warning
}
namespace tailpad {
struct foo {
char c1[1]; // expected-note {{declared here}}
int x;
char c2[1];
};
class baz {
public:
char c1[1]; // expected-note {{declared here}}
int x;
char c2[1];
};
char bar(struct foo *F, baz *B) {
return F->c1[3] + // expected-warning {{array index 3 is past the end of the array (that has type 'char[1]')}}
F->c2[3] + // no warning, foo could have tail padding allocated.
B->c1[3] + // expected-warning {{array index 3 is past the end of the array (that has type 'char[1]')}}
B->c2[3]; // no warning, baz could have tail padding allocated.
}
}
namespace metaprogramming {
#define ONE 1
struct foo {
char c[ONE]; // expected-note {{array 'c' declared here}}
};
template <int N> struct bar { char c[N]; }; // expected-note {{declared here}}
char test(foo *F, bar<1> *B) {
return F->c[3] + // expected-warning {{array index 3 is past the end of the array (that has type 'char[1]')}}
B->c[3]; // expected-warning {{array index 3 is past the end of the array (that has type 'char[1]')}}
}
}
void bar(int x) {}
int test_more() {
int foo[5]; // expected-note 5 {{array 'foo' declared here}}
bar(foo[5]); // expected-warning {{array index 5 is past the end of the array (that has type 'int[5]')}}
++foo[5]; // expected-warning {{array index 5 is past the end of the array (that has type 'int[5]')}}
if (foo[6]) // expected-warning {{array index 6 is past the end of the array (that has type 'int[5]')}}
return --foo[6]; // expected-warning {{array index 6 is past the end of the array (that has type 'int[5]')}}
else
return foo[5]; // expected-warning {{array index 5 is past the end of the array (that has type 'int[5]')}}
}
void test_pr10771() {
double foo[4096]; // expected-note {{array 'foo' declared here}}
((char*)foo)[sizeof(foo) - 1] = '\0'; // no-warning
*(((char*)foo) + sizeof(foo) - 1) = '\0'; // no-warning
((char*)foo)[sizeof(foo)] = '\0'; // expected-warning {{array index 32768 is past the end of the array (that has type 'double[4096]', cast to 'char *')}}
// TODO: This should probably warn, too.
*(((char*)foo) + sizeof(foo)) = '\0'; // no-warning
}
int test_pr11007_aux(const char * restrict, ...);
// Test checking with varargs.
void test_pr11007() {
double a[5]; // expected-note {{array 'a' declared here}}
test_pr11007_aux("foo", a[1000]); // expected-warning {{array index 1000 is past the end of the array (that has type 'double[5]')}}
}
void test_rdar10916006(void)
{
int a[128]; // expected-note {{array 'a' declared here}}
a[(unsigned char)'\xA1'] = 1; // expected-warning {{array index 161 is past the end of the array (that has type 'int[128]')}}
}
struct P {
int a;
int b;
};
void test_struct_array_index() {
struct P p[10]; // expected-note {{array 'p' declared here}}
p[11] = {0, 1}; // expected-warning {{array index 11 is past the end of the array (that has type 'struct P[10]')}}
}
int operator+(const struct P &s1, const struct P &s2);
int test_operator_overload_struct_array_index() {
struct P x[10] = {0}; // expected-note {{array 'x' declared here}}
return x[1] + x[11]; // expected-warning {{array index 11 is past the end of the array (that has type 'struct P[10]')}}
}
int multi[2][2][2]; // expected-note 3 {{array 'multi' declared here}}
int test_multiarray() {
return multi[2][0][0] + // expected-warning {{array index 2 is past the end of the array (that has type 'int[2][2][2]')}}
multi[0][2][0] + // expected-warning {{array index 2 is past the end of the array (that has type 'int[2][2]')}}
multi[0][0][2]; // expected-warning {{array index 2 is past the end of the array (that has type 'int[2]')}}
}
struct multi_s {
int arr[4];
};
struct multi_s multi2[4]; // expected-note {{array 'multi2' declared here}}
int test_struct_multiarray() {
return multi2[4].arr[0]; // expected-warning {{array index 4 is past the end of the array (that has type 'struct multi_s[4]')}}
}
namespace PR39746 {
struct S;
extern S xxx[2]; // expected-note {{array 'xxx' declared here}}
class C {};
C &f() { return reinterpret_cast<C *>(xxx)[1]; } // no-warning
// We have no info on whether this is out-of-bounds.
C &g() { return reinterpret_cast<C *>(xxx)[2]; } // no-warning
// We can still diagnose this.
C &h() { return reinterpret_cast<C *>(xxx)[-1]; } // expected-warning {{array index -1 is before the beginning of the array}}
}
namespace PR41087 {
template <typename Ty> void foo() {
Ty buffer[2]; // expected-note 3{{array 'buffer' declared here}}
((char *)buffer)[2] = 'A'; // expected-warning 1{{array index 2 is past the end of the array (that has type 'char[2]', cast to 'char *')}}
((char *)buffer)[-1] = 'A'; // expected-warning 2{{array index -1 is before the beginning of the array}}
}
void f() {
foo<char>(); // expected-note 1{{in instantiation of function template specialization}}
foo<int>(); // expected-note 1{{in instantiation of function template specialization}}
};
}
namespace var_template_array {
template <typename T> int arr[2]; // expected-note {{array 'arr<int>' declared here}}
template <> int arr<float>[1]; // expected-note {{array 'arr<float>' declared here}}
void test() {
arr<int>[1] = 0; // ok
arr<int>[2] = 0; // expected-warning {{array index 2 is past the end of the array (that has type 'int[2]')}}
arr<float>[1] = 0; // expected-warning {{array index 1 is past the end of the array (that has type 'int[1]')}}
}
} // namespace var_template_array
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