255 lines
9.6 KiB
C
255 lines
9.6 KiB
C
// RUN: %clang_cc1 %s -verify -pedantic -fsyntax-only
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// PR 8876 - don't warn about trivially unreachable null derefs. Note that
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// we put this here because the reachability analysis only kicks in for
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// suppressing false positives when code has no errors.
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#define PR8876(err_ptr) do {\
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if (err_ptr) *(int*)(err_ptr) = 1;\
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} while (0)
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#define PR8876_pos(err_ptr) do {\
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if (!err_ptr) *(int*)(err_ptr) = 1;\
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} while (0)
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// Test that we don't report divide-by-zero errors in unreachable code.
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// This test should be left as is, as it also tests CFG functionality.
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void radar9171946() {
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if (0) {
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0 / (0 ? 1 : 0); // expected-warning {{expression result unused}}
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}
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}
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int test_pr8876() {
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PR8876(0); // no-warning
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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'}}
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return 0;
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}
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// PR 8183 - Handle null pointer constants on the left-side of the '&&', and reason about
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// this when determining the reachability of the null pointer dereference on the right side.
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void pr8183(unsigned long long test)
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{
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(void)((((void*)0)) && (*((unsigned long long*)(((void*)0))) = ((unsigned long long)((test)) % (unsigned long long)((1000000000))))); // no-warning
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(*((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'}}
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}
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// PR1966
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_Complex double test1() {
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return __extension__ 1.0if;
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}
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_Complex double test2() {
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return 1.0if; // expected-warning {{imaginary constants are a GNU extension}}
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}
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// rdar://6097308
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void test3() {
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int x;
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(__extension__ x) = 10;
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}
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// rdar://6162726
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void test4() {
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static int var;
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var =+ 5; // expected-warning {{use of unary operator that may be intended as compound assignment (+=)}}
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var =- 5; // expected-warning {{use of unary operator that may be intended as compound assignment (-=)}}
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var = +5; // no warning when space between the = and +.
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var = -5;
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var =+5; // no warning when the subexpr of the unary op has no space before it.
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var =-5;
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#define FIVE 5
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var=-FIVE; // no warning with macros.
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var=-FIVE;
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}
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// rdar://6319320
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void test5(int *X, float *P) {
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(float*)X = P; // expected-error {{assignment to cast is illegal, lvalue casts are not supported}}
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#define FOO ((float*) X)
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FOO = P; // expected-error {{assignment to cast is illegal, lvalue casts are not supported}}
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}
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void test6() {
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int X;
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X(); // expected-error {{called object type 'int' is not a function or function pointer}}
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}
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void test7(int *P, _Complex float Gamma) {
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P = (P-42) + Gamma*4; // expected-error {{invalid operands to binary expression ('int *' and '_Complex float')}}
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}
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// rdar://6095061
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int test8(void) {
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int i;
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__builtin_choose_expr (0, 42, i) = 10;
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return i;
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}
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// PR3386
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struct f { int x : 4; float y[]; };
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int test9(struct f *P) {
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int R;
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R = __alignof(P->x); // expected-error {{invalid application of 'alignof' to bit-field}}
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R = __alignof(P->y); // ok.
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R = sizeof(P->x); // expected-error {{invalid application of 'sizeof' to bit-field}}
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__extension__ ({ R = (__typeof__(P->x)) 2; }); // expected-error {{invalid application of 'typeof' to bit-field}}
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return R;
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}
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// PR3562
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void test10(int n,...) {
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struct S {
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double a[n]; // expected-error {{fields must have a constant size}}
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} s;
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double x = s.a[0]; // should not get another error here.
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}
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#define MYMAX(A,B) __extension__ ({ __typeof__(A) __a = (A); __typeof__(B) __b = (B); __a < __b ? __b : __a; })
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struct mystruct {int A; };
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void test11(struct mystruct P, float F) {
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MYMAX(P, F); // expected-error {{invalid operands to binary expression ('typeof (P)' (aka 'struct mystruct') and 'typeof (F)' (aka 'float'))}}
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}
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// PR3753
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int test12(const char *X) {
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return X == "foo"; // expected-warning {{comparison against a string literal is unspecified (use strncmp instead)}}
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}
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int test12b(const char *X) {
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return sizeof(X == "foo"); // no-warning
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}
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// rdar://6719156
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void test13(
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void (^P)()) { // expected-error {{blocks support disabled - compile with -fblocks}}
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P();
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P = ^(){}; // expected-error {{blocks support disabled - compile with -fblocks}}
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}
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void test14() {
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typedef long long __m64 __attribute__((__vector_size__(8)));
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typedef short __v4hi __attribute__((__vector_size__(8)));
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// Ok.
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__v4hi a;
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__m64 mask = (__m64)((__v4hi)a > (__v4hi)a);
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}
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// PR5242
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typedef unsigned long *test15_t;
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test15_t test15(void) {
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return (test15_t)0 + (test15_t)0; // expected-error {{invalid operands to binary expression ('test15_t' (aka 'unsigned long *') and 'test15_t')}}
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}
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// rdar://7446395
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void test16(float x) { x == ((void*) 0); } // expected-error {{invalid operands to binary expression}}
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// PR6004
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void test17(int x) {
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x = x / 0; // expected-warning {{division by zero is undefined}}
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x = x % 0; // expected-warning {{remainder by zero is undefined}}
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x /= 0; // expected-warning {{division by zero is undefined}}
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x %= 0; // expected-warning {{remainder by zero is undefined}}
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x = sizeof(x/0); // no warning.
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}
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// PR6501 & PR11857
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void test18_a(int a); // expected-note 2 {{'test18_a' declared here}}
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void test18_b(int); // expected-note {{'test18_b' declared here}}
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void test18_c(int a, int b); // expected-note 2 {{'test18_c' declared here}}
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void test18_d(int a, ...); // expected-note {{'test18_d' declared here}}
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void test18_e(int a, int b, ...); // expected-note {{'test18_e' declared here}}
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void test18(int b) {
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test18_a(b, b); // expected-error {{too many arguments to function call, expected single argument 'a', have 2}}
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test18_a(); // expected-error {{too few arguments to function call, single argument 'a' was not specified}}
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test18_b(); // expected-error {{too few arguments to function call, expected 1, have 0}}
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test18_c(b); // expected-error {{too few arguments to function call, expected 2, have 1}}
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test18_c(b, b, b); // expected-error {{too many arguments to function call, expected 2, have 3}}
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test18_d(); // expected-error {{too few arguments to function call, at least argument 'a' must be specified}}
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test18_e(); // expected-error {{too few arguments to function call, expected at least 2, have 0}}
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}
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// PR7569
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void test19() {
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*(int*)0 = 0; // expected-warning {{indirection of non-volatile null pointer}} \
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// expected-note {{consider using __builtin_trap}}
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*(volatile int*)0 = 0; // Ok.
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// rdar://9269271
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int x = *(int*)0; // expected-warning {{indirection of non-volatile null pointer}} \
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// expected-note {{consider using __builtin_trap}}
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int x2 = *(volatile int*)0; // Ok.
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int *p = &(*(int*)0); // Ok;
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}
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int test20(int x) {
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return x && 4; // expected-warning {{use of logical '&&' with constant operand}} \
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// expected-note {{use '&' for a bitwise operation}} \
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// expected-note {{remove constant to silence this warning}}
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return x && sizeof(int) == 4; // no warning, RHS is logical op.
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// no warning, this is an idiom for "true" in old C style.
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return x && (signed char)1;
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return x || 0;
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return x || 1;
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return x || -1; // expected-warning {{use of logical '||' with constant operand}} \
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// expected-note {{use '|' for a bitwise operation}}
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return x || 5; // expected-warning {{use of logical '||' with constant operand}} \
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// expected-note {{use '|' for a bitwise operation}}
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return x && 0;
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return x && 1;
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return x && -1; // expected-warning {{use of logical '&&' with constant operand}} \
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// expected-note {{use '&' for a bitwise operation}} \
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// expected-note {{remove constant to silence this warning}}
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return x && 5; // expected-warning {{use of logical '&&' with constant operand}} \
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// expected-note {{use '&' for a bitwise operation}} \
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// expected-note {{remove constant to silence this warning}}
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return x || (0);
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return x || (1);
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return x || (-1); // expected-warning {{use of logical '||' with constant operand}} \
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// expected-note {{use '|' for a bitwise operation}}
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return x || (5); // expected-warning {{use of logical '||' with constant operand}} \
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// expected-note {{use '|' for a bitwise operation}}
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return x && (0);
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return x && (1);
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return x && (-1); // expected-warning {{use of logical '&&' with constant operand}} \
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// expected-note {{use '&' for a bitwise operation}} \
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// expected-note {{remove constant to silence this warning}}
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return x && (5); // expected-warning {{use of logical '&&' with constant operand}} \
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// expected-note {{use '&' for a bitwise operation}} \
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// expected-note {{remove constant to silence this warning}}
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}
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struct Test21; // expected-note 2 {{forward declaration}}
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void test21(volatile struct Test21 *ptr) {
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void test21_help(void);
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(test21_help(), *ptr); // expected-error {{incomplete type 'struct Test21' where a complete type is required}}
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(*ptr, test21_help()); // expected-error {{incomplete type 'struct Test21' where a complete type is required}}
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}
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// Make sure we do function/array decay.
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void test22() {
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if ("help")
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(void) 0;
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if (test22) // expected-warning {{address of function 'test22' will always evaluate to 'true'}} \
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// expected-note {{prefix with the address-of operator to silence this warning}}
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(void) 0;
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if (&test22)
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(void) 0;
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}
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