// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
void a(int i);
int b();
int c();
#define MACRO_A 0
#define AND(x, y) ((x) && (y))
void test1(int x, int y) {
while(true) {
if (x); // expected-warning {{if statement has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
// Check that we handle conditions that start or end with a macro
// correctly.
if (x == MACRO_A); // expected-warning {{if statement has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
if (MACRO_A == x); // expected-warning {{if statement has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
// Check that we handle the case where the condition comes from a macro
// expansion over multiple lines.
if (AND(b(),
c())); // expected-warning {{if statement has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
while (AND(b(),
c())); // expected-warning{{while loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
a(0);
int i;
// PR11329
for (i = 0; i < x; i++); { // expected-warning{{for loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
a(i);
b();
}
for (i = 0; i < x; i++); // expected-warning{{for loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
{
a(i);
}
for (i = 0;
i < x;
i++); // expected-warning{{for loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
{
a(i);
}
int arr[3] = { 1, 2, 3 };
for (int j : arr); // expected-warning{{range-based for loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
a(i);
for (int j :
arr); // expected-warning{{range-based for loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
a(i);
while (b() == 0); // expected-warning{{while loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
a(i);
while (b() == 0); { // expected-warning{{while loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
a(i);
}
while (b() == 0); // expected-warning{{while loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
{
a(i);
}
while (b() == 0 ||
c() == 0); // expected-warning{{while loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
{
a(i);
}
do; // expected-note{{to match this 'do'}}
b(); // expected-error{{expected 'while' in do/while loop}}
while (b()); // no-warning
c();
do; // expected-note{{to match this 'do'}}
b(); // expected-error{{expected 'while' in do/while loop}}
while (b()); // expected-warning{{while loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
c();
switch(x) // no-warning
{
switch(y); // expected-warning{{switch statement has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
{
case 0:
a(10);
break;
default:
a(20);
break;
}
}
}
}
/// There should be no warning when null statement is placed on its own line.
void test2(int x, int y) {
if (x) // no-warning
; // no-warning
int i;
for (i = 0; i < x; i++) // no-warning
; // no-warning
for (i = 0;
i < x;
i++) // no-warning
; // no-warning
int arr[3] = { 1, 2, 3 };
for (int j : arr) // no-warning
; // no-warning
while (b() == 0) // no-warning
; // no-warning
while (b() == 0 ||
c() == 0) // no-warning
; // no-warning
switch(x)
{
switch(y) // no-warning
; // no-warning
}
// Last `for' or `while' statement in compound statement shouldn't warn.
while(b() == 0); // no-warning
}
/// There should be no warning for a null statement resulting from an empty macro.
#define EMPTY(a)
void test3(int x, int y) {
if (x) EMPTY(x); // no-warning
int i;
for (i = 0; i < x; i++) EMPTY(i); // no-warning
for (i = 0;
i < x;
i++) EMPTY(i); // no-warning
int arr[3] = { 1, 2, 3 };
for (int j : arr) EMPTY(j); // no-warning
for (int j :
arr) EMPTY(j); // no-warning
while (b() == 0) EMPTY(i); // no-warning
while (b() == 0 ||
c() == 0) EMPTY(i); // no-warning
switch (x) {
switch (y)
EMPTY(i); // no-warning
}
}
void test4(int x)
{
// Idiom used in some metaprogramming constructs.
switch (x) default:; // no-warning
// Frequent idiom used in macros.
do {} while (false); // no-warning
}
/// There should be no warning for a common for/while idiom when it is obvious
/// from indentation that next statement wasn't meant to be a body.
void test5(int x, int y) {
int i;
for (i = 0; i < x; i++); // expected-warning{{for loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
a(i);
for (i = 0; i < x; i++); // no-warning
a(i);
for (i = 0;
i < x;
i++); // expected-warning{{for loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
a(i);
for (i = 0;
i < x;
i++); // no-warning
a(i);
while (b() == 0); // expected-warning{{while loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
a(i);
while (b() == 0); // no-warning
a(i);
while (b() == 0 ||
c() == 0); // expected-warning{{while loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
a(i);
while (b() == 0 ||
c() == 0); // no-warning
a(i);
}
/// There should be no warning for a statement with a non-null body.
void test6(int x, int y) {
if (x) {} // no-warning
if (x)
a(x); // no-warning
int i;
for (i = 0; i < x; i++) // no-warning
a(i); // no-warning
for (i = 0; i < x; i++) { // no-warning
a(i); // no-warning
}
for (i = 0;
i < x;
i++) // no-warning
a(i); // no-warning
int arr[3] = { 1, 2, 3 };
for (int j : arr) // no-warning
a(j);
for (int j : arr) {} // no-warning
while (b() == 0) // no-warning
a(i); // no-warning
while (b() == 0) {} // no-warning
switch(x) // no-warning
{
switch(y) // no-warning
{
case 0:
a(10);
break;
default:
a(20);
break;
}
}
}
void test_errors(int x) {
if (1)
aa; // expected-error{{use of undeclared identifier}}
// no empty body warning.
int i;
for (i = 0; i < x; i++)
bb; // expected-error{{use of undeclared identifier}}
int arr[3] = { 1, 2, 3 };
for (int j : arr)
cc; // expected-error{{use of undeclared identifier}}
while (b() == 0)
dd; // expected-error{{use of undeclared identifier}}
}
// Warnings for statements in templates shouldn't be duplicated for all
// instantiations.
template <typename T>
void test_template(int x) {
if (x); // expected-warning{{if statement has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
if (x)
EMPTY(x); // no-warning
int arr[3] = { 1, 2, 3 };
for (int j : arr); // expected-warning{{range-based for loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
while (b() == 0); // expected-warning{{while loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
a(x);
}
void test_template_inst(int x) {
test_template<int>(x);
test_template<double>(x);
}
#define IDENTITY(a) a
void test7(int x, int y) {
if (x) IDENTITY(); // no-warning
}
Codebase Browser
llvm