// RUN: %clang_cc1 %s -verify -pedantic -fsyntax-only
// PR 8876 - don't warn about trivially unreachable null derefs. Note that
// we put this here because the reachability analysis only kicks in for
// suppressing false positives when code has no errors.
#define PR8876(err_ptr) do {\
if (err_ptr) *(int*)(err_ptr) = 1;\
} while (0)
#define PR8876_pos(err_ptr) do {\
if (!err_ptr) *(int*)(err_ptr) = 1;\
} while (0)
// Test that we don't report divide-by-zero errors in unreachable code.
// This test should be left as is, as it also tests CFG functionality.
void radar9171946(void) {
if (0) {
0 / (0 ? 1 : 0); // no-warning
}
}
int test_pr8876(void) {
PR8876(0); // no-warning
PR8876_pos(0); // expected-warning{{indirection of non-volatile null pointer will be deleted, not trap}} expected-note{{consider using __builtin_trap() or qualifying pointer with 'volatile'}}
return 0;
}
// PR 8183 - Handle null pointer constants on the left-side of the '&&', and reason about
// this when determining the reachability of the null pointer dereference on the right side.
void pr8183(unsigned long long test)
{
(void)((((void*)0)) && (*((unsigned long long*)(((void*)0))) = ((unsigned long long)((test)) % (unsigned long long)((1000000000))))); // no-warning
(*((unsigned long long*)(((void*)0))) = ((unsigned long long)((test)) % (unsigned long long)((1000000000)))); // expected-warning {{indirection of non-volatile null pointer will be deleted, not trap}} expected-note {{consider using __builtin_trap() or qualifying pointer with 'volatile'}}
}
// PR1966
_Complex double test1(void) {
return __extension__ 1.0if;
}
_Complex double test2(void) {
return 1.0if; // expected-warning {{imaginary constants are a GNU extension}}
}
void test3(void) {
int x;
(__extension__ x) = 10;
}
void test4(void) {
static int var;
var =+ 5; // expected-warning {{use of unary operator that may be intended as compound assignment (+=)}}
var =- 5; // expected-warning {{use of unary operator that may be intended as compound assignment (-=)}}
var = +5; // no warning when space between the = and +.
var = -5;
var =+5; // no warning when the subexpr of the unary op has no space before it.
var =-5;
#define FIVE 5
var=-FIVE; // no warning with macros.
var=-FIVE;
}
void test5(int *X, float *P) {
(float*)X = P; // expected-error {{assignment to cast is illegal, lvalue casts are not supported}}
#define FOO ((float*) X)
FOO = P; // expected-error {{assignment to cast is illegal, lvalue casts are not supported}}
}
void test6(void) {
int X;
X(); // expected-error {{called object type 'int' is not a function or function pointer}}
}
void test7(int *P, _Complex float Gamma) {
P = (P-42) + Gamma*4; // expected-error {{invalid operands to binary expression ('int *' and '_Complex float')}}
}
int test8(void) {
int i;
__builtin_choose_expr (0, 42, i) = 10;
return i;
}
// PR3386
struct f { int x : 4; float y[]; };
int test9(struct f *P) {
int R;
R = __alignof(P->x); // expected-error {{invalid application of 'alignof' to bit-field}}
R = __alignof(P->y); // ok.
R = sizeof(P->x); // expected-error {{invalid application of 'sizeof' to bit-field}}
__extension__ ({ R = (__typeof__(P->x)) 2; }); // expected-error {{invalid application of 'typeof' to bit-field}}
return R;
}
// PR3562
void test10(int n,...) {
struct S {
double a[n]; // expected-error {{fields must have a constant size}}
} s;
double x = s.a[0]; // should not get another error here.
}
#define MYMAX(A,B) __extension__ ({ __typeof__(A) __a = (A); __typeof__(B) __b = (B); __a < __b ? __b : __a; })
struct mystruct {int A; };
void test11(struct mystruct P, float F) {
MYMAX(P, F); // expected-error {{invalid operands to binary expression ('typeof (P)' (aka 'struct mystruct') and 'typeof (F)' (aka 'float'))}}
}
// PR3753
int test12(const char *X) {
return X == "foo"; // expected-warning {{comparison against a string literal is unspecified (use an explicit string comparison function instead)}}
}
int test12b(const char *X) {
return sizeof(X == "foo"); // no-warning
}
void test13(
void (^P)(void)) { // expected-error {{blocks support disabled - compile with -fblocks}}
P();
P = ^(void){}; // expected-error {{blocks support disabled - compile with -fblocks}}
}
void test14(void) {
typedef long long __m64 __attribute__((__vector_size__(8)));
typedef short __v4hi __attribute__((__vector_size__(8)));
// Ok.
__v4hi a;
__m64 mask = (__m64)((__v4hi)a > (__v4hi)a);
}
// PR5242
typedef unsigned long *test15_t;
test15_t test15(void) {
return (test15_t)0 + (test15_t)0; // expected-error {{invalid operands to binary expression ('test15_t' (aka 'unsigned long *') and 'test15_t')}}
}
void test16(float x) { x == ((void*) 0); } // expected-error {{invalid operands to binary expression}}
// PR6004
void test17(int x) {
x = x / 0; // expected-warning {{division by zero is undefined}}
x = x % 0; // expected-warning {{remainder by zero is undefined}}
x /= 0; // expected-warning {{division by zero is undefined}}
x %= 0; // expected-warning {{remainder by zero is undefined}}
x = sizeof(x/0); // no warning.
}
// PR6501, PR11857, and PR23564
void test18_a(int a); // expected-note 2 {{'test18_a' declared here}}
void test18_b(int); // expected-note {{'test18_b' declared here}}
void test18_c(int a, int b); // expected-note 2 {{'test18_c' declared here}}
void test18_d(int a, ...); // expected-note {{'test18_d' declared here}}
void test18_e(int a, int b, ...); // expected-note {{'test18_e' declared here}}
#define MY_EXPORT __attribute__((visibility("default")))
MY_EXPORT void // (no "declared here" notes on this line, no "expanded from MY_EXPORT" notes either)
test18_f(int a, int b); // expected-note 2 {{'test18_f' declared here}}
void test18(int b) {
test18_a(b, b); // expected-error {{too many arguments to function call, expected single argument 'a', have 2}}
test18_a(); // expected-error {{too few arguments to function call, single argument 'a' was not specified}}
test18_b(); // expected-error {{too few arguments to function call, expected 1, have 0}}
test18_c(b); // expected-error {{too few arguments to function call, expected 2, have 1}}
test18_c(b, b, b); // expected-error {{too many arguments to function call, expected 2, have 3}}
test18_d(); // expected-error {{too few arguments to function call, at least argument 'a' must be specified}}
test18_e(); // expected-error {{too few arguments to function call, expected at least 2, have 0}}
test18_f(b); // expected-error {{too few arguments to function call, expected 2, have 1}}
test18_f(b, b, b); // expected-error {{too many arguments to function call, expected 2, have 3}}
}
typedef int __attribute__((address_space(256))) int_AS256;
// PR7569
void test19(void) {
*(int *)0 = 0; // expected-warning {{indirection of non-volatile null pointer}} \
// expected-note {{consider using __builtin_trap}}
*(volatile int *)0 = 0; // Ok.
*(int __attribute__((address_space(256))) *)0 = 0; // Ok.
*(int __attribute__((address_space(0))) *)0 = 0; // expected-warning {{indirection of non-volatile null pointer}} \
// expected-note {{consider using __builtin_trap}}
*(int_AS256 *)0 = 0; // Ok.
int x = *(int *)0; // expected-warning {{indirection of non-volatile null pointer}} \
// expected-note {{consider using __builtin_trap}}
int x2 = *(volatile int *)0; // Ok.
int x3 = *(int __attribute__((address_space(0))) *)0; // expected-warning {{indirection of non-volatile null pointer}} \
// expected-note {{consider using __builtin_trap}}
int x4 = *(int_AS256 *)0; // Ok.
int *p = &(*(int *)0); // Ok.
int_AS256 *p1 = &(*(int __attribute__((address_space(256))) *)0); // Ok.
int __attribute__((address_space(0))) *p2 = &(*(int __attribute__((address_space(0))) *)0); // Ok.
}
int test20(int x) {
return x && 4; // expected-warning {{use of logical '&&' with constant operand}} \
// expected-note {{use '&' for a bitwise operation}} \
// expected-note {{remove constant to silence this warning}}
return x && sizeof(int) == 4; // no warning, RHS is logical op.
// no warning, this is an idiom for "true" in old C style.
return x && (signed char)1;
return x || 0;
return x || 1;
return x || -1; // expected-warning {{use of logical '||' with constant operand}} \
// expected-note {{use '|' for a bitwise operation}}
return x || 5; // expected-warning {{use of logical '||' with constant operand}} \
// expected-note {{use '|' for a bitwise operation}}
return x && 0;
return x && 1;
return x && -1; // expected-warning {{use of logical '&&' with constant operand}} \
// expected-note {{use '&' for a bitwise operation}} \
// expected-note {{remove constant to silence this warning}}
return x && 5; // expected-warning {{use of logical '&&' with constant operand}} \
// expected-note {{use '&' for a bitwise operation}} \
// expected-note {{remove constant to silence this warning}}
return x || (0);
return x || (1);
return x || (-1); // expected-warning {{use of logical '||' with constant operand}} \
// expected-note {{use '|' for a bitwise operation}}
return x || (5); // expected-warning {{use of logical '||' with constant operand}} \
// expected-note {{use '|' for a bitwise operation}}
return x && (0);
return x && (1);
return x && (-1); // expected-warning {{use of logical '&&' with constant operand}} \
// expected-note {{use '&' for a bitwise operation}} \
// expected-note {{remove constant to silence this warning}}
return x && (5); // expected-warning {{use of logical '&&' with constant operand}} \
// expected-note {{use '&' for a bitwise operation}} \
// expected-note {{remove constant to silence this warning}}
}
struct Test21; // expected-note 2 {{forward declaration}}
void test21(volatile struct Test21 *ptr) {
void test21_help(void);
(test21_help(), *ptr); // expected-error {{incomplete type 'struct Test21' where a complete type is required}}
(*ptr, test21_help()); // expected-error {{incomplete type 'struct Test21' where a complete type is required}}
}
// Make sure we do function/array decay.
void test22(void) {
if ("help")
(void) 0;
if (test22) // expected-warning {{address of function 'test22' will always evaluate to 'true'}} \
// expected-note {{prefix with the address-of operator to silence this warning}}
(void) 0;
if (&test22)
(void) 0;
}
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