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// RUN: clang -std=gnu99 -checker-simple -verify %s &&
// RUN: clang -std=gnu99 -checker-simple -analyzer-store-region -analyzer-purge-dead=false -verify %s
#include<stdint.h>
#include <assert.h>
void f1(int *p) {
if (p) *p = 1;
else *p = 0; // expected-warning{{ereference}}
}
struct foo_struct {
int x;
};
int f2(struct foo_struct* p) {
if (p)
p->x = 1;
return p->x++; // expected-warning{{Dereference of null pointer.}}
}
int f3(char* x) {
int i = 2;
if (x)
return x[i - 1];
return x[i+1]; // expected-warning{{Dereference of null pointer.}}
}
int f3_b(char* x) {
int i = 2;
if (x)
return x[i - 1];
return x[i+1]++; // expected-warning{{Dereference of null pointer.}}
}
int f4(int *p) {
uintptr_t x = (uintptr_t) p;
if (x)
return 1;
int *q = (int*) x;
return *q; // expected-warning{{Dereference of null pointer.}}
}
int f5() {
char *s = "hello world";
return s[0]; // no-warning
}
int bar(int* p, int q) __attribute__((nonnull));
int f6(int *p) {
return !p ? bar(p, 1) // expected-warning {{Null pointer passed as an argument to a 'nonnull' parameter}}
: bar(p, 0); // no-warning
}
int bar2(int* p, int q) __attribute__((nonnull(1)));
int f6b(int *p) {
return !p ? bar2(p, 1) // expected-warning {{Null pointer passed as an argument to a 'nonnull' parameter}}
: bar2(p, 0); // no-warning
}
int bar3(int*p, int q, int *r) __attribute__((nonnull(1,3)));
int f6c(int *p, int *q) {
return !p ? bar3(q, 2, p) // expected-warning {{Null pointer passed as an argument to a 'nonnull' parameter}}
: bar3(p, 2, q); // no-warning
}
int* qux();
int f7(int x) {
int* p = 0;
if (0 == x)
p = qux();
if (0 == x)
*p = 1; // no-warning
return x;
}
int f8(int *p, int *q) {
if (!p)
if (p)
*p = 1; // no-warning
if (q)
if (!q)
*q = 1; // no-warning
}
int* qux();
int f9(unsigned len) {
assert (len != 0);
int *p = 0;
unsigned i;
for (i = 0; i < len; ++i)
p = qux(i);
return *p++; // no-warning
}
int f9b(unsigned len) {
assert (len > 0); // note use of '>'
int *p = 0;
unsigned i;
for (i = 0; i < len; ++i)
p = qux(i);
return *p++; // no-warning
}
int* f10(int* p, signed char x, int y) {
// This line tests symbolication with compound assignments where the
// LHS and RHS have different bitwidths. The new symbolic value
// for 'x' should have a bitwidth of 8.
x &= y;
// This tests that our symbolication worked, and that we correctly test
// x against 0 (with the same bitwidth).
if (!x) {
if (!p) return;
*p = 10;
}
else p = 0;
if (!x)
*p = 5; // no-warning
return p;
}
// Test case from <rdar://problem/6407949>
void f11(unsigned i) {
int *x = 0;
if (i >= 0) {
// always true
} else {
*x = 42; // no-warning
}
}
void f11b(unsigned i) {
int *x = 0;
if (i <= ~(unsigned)0) {
// always true
} else {
*x = 42; // no-warning
}
}
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