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// RUN: clang-cc -analyze -warn-dead-stores -verify %s &&
// RUN: clang-cc -analyze -checker-simple -analyzer-store=basic -analyzer-constraints=basic -warn-dead-stores -verify %s &&
// RUN: clang-cc -analyze -checker-simple -analyzer-store=basic -analyzer-constraints=range -warn-dead-stores -verify %s &&
// RUN: clang-cc -analyze -checker-cfref -analyzer-store=basic -analyzer-constraints=basic -warn-dead-stores -verify %s &&
// RUN: clang-cc -analyze -checker-cfref -analyzer-store=basic -analyzer-constraints=range -warn-dead-stores -verify %s &&
// RUN: clang-cc -analyze -checker-cfref -analyzer-store=region -analyzer-constraints=basic -warn-dead-stores -verify %s &&
// RUN: clang-cc -analyze -checker-cfref -analyzer-store=region -analyzer-constraints=range -warn-dead-stores -verify %s
void f1() {
int k, y;
int abc=1;
long idx=abc+3*5; // expected-warning {{never read}}
}
void f2(void *b) {
char *c = (char*)b; // no-warning
char *d = b+1; // expected-warning {{never read}}
printf("%s", c); // expected-warning{{implicitly declaring C library function 'printf' with type 'int (char const *, ...)'}} \
// expected-note{{please include the header <stdio.h> or explicitly provide a declaration for 'printf'}}
}
void f3() {
int r;
if ((r = f()) != 0) { // no-warning
int y = r; // no-warning
printf("the error is: %d\n", y);
}
}
void f4(int k) {
k = 1;
if (k)
f1();
k = 2; // expected-warning {{never read}}
}
void f5() {
int x = 4; // no-warning
int *p = &x; // expected-warning{{never read}}
}
int f6() {
int x = 4;
++x; // expected-warning{{never read}}
return 1;
}
int f7(int *p) {
// This is allowed for defensive programming.
p = 0; // no-warning
return 1;
}
int f8(int *p) {
extern int *baz();
if (p = baz()) // expected-warning{{Although the value}}
return 1;
return 0;
}
int f9() {
int x = 4;
x = x + 10; // expected-warning{{never read}}
return 1;
}
int f10() {
int x = 4;
x = 10 + x; // expected-warning{{never read}}
return 1;
}
int f11() {
int x = 4;
return x++; // expected-warning{{never read}}
}
int f11b() {
int x = 4;
return ((((++x)))); // no-warning
}
int f12a(int y) {
int x = y; // expected-warning{{never read}}
return 1;
}
int f12b(int y) {
int x __attribute__((unused)) = y; // no-warning
return 1;
}
// Filed with PR 2630. This code should produce no warnings.
int f13(void)
{
int a = 1;
int b, c = b = a + a;
if (b > 0)
return (0);
return (a + b + c);
}
// Filed with PR 2763.
int f14(int count) {
int index, nextLineIndex;
for (index = 0; index < count; index = nextLineIndex+1) {
nextLineIndex = index+1; // no-warning
continue;
}
return index;
}
// Test case for <rdar://problem/6248086>
void f15(unsigned x, unsigned y) {
int count = x * y; // no-warning
int z[count];
}
int f16(int x) {
x = x * 2;
x = sizeof(int [x = (x || x + 1) * 2]) // expected-warning{{Although the value stored to 'x' is used}}
? 5 : 8;
return x;
}
// Self-assignments should not be flagged as dead stores.
int f17() {
int x = 1;
x = x; // no-warning
}
// <rdar://problem/6506065>
// The values of dead stores are only "consumed" in an enclosing expression
// what that value is actually used. In other words, don't say "Although the value stored to 'x' is used...".
int f18() {
int x = 0; // no-warning
if (1)
x = 10; // expected-warning{{Value stored to 'x' is never read}}
while (1)
x = 10; // expected-warning{{Value stored to 'x' is never read}}
do
x = 10; // expected-warning{{Value stored to 'x' is never read}}
while (1);
return (x = 10); // expected-warning{{Although the value stored to 'x' is used in the enclosing expression, the value is never actually read from 'x'}}
}
// PR 3514: false positive `dead initialization` warning for init to global
// http://llvm.org/bugs/show_bug.cgi?id=3514
extern const int MyConstant;
int f19(void) {
int x = MyConstant; // no-warning
x = 1;
return x;
}
int f19b(void) { // This case is the same as f19.
const int MyConstant = 0;
int x = MyConstant; // no-warning
x = 1;
return x;
}
void f20(void) {
int x = 1; // no-warning
#pragma unused(x)
}
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