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// RUN: %clang_analyze_cc1 -w -x c -analyzer-checker=core -analyzer-output=text\
// RUN: -verify %s
typedef __typeof(sizeof(int)) size_t;
void *memset(void *__s, int __c, size_t __n);
int initializer1(int *p, int x) {
if (x) { // expected-note{{'x' is 0}}
// expected-note@-1{{Taking false branch}}
*p = 1;
return 0;
} else {
return 1; // expected-note {{Returning without writing to '*p'}}
}
}
int param_not_initialized_by_func() {
int p; // expected-note {{'p' declared without an initial value}}
int out = initializer1(&p, 0); // expected-note{{Calling 'initializer1'}}
// expected-note@-1{{Returning from 'initializer1'}}
return p; // expected-note{{Undefined or garbage value returned to caller}}
// expected-warning@-1{{Undefined or garbage value returned to caller}}
}
int param_initialized_properly() {
int p;
int out = initializer1(&p, 1);
return p; //no-warning
}
static int global;
int initializer2(int **p, int x) {
if (x) { // expected-note{{'x' is 0}}
// expected-note@-1{{Taking false branch}}
*p = &global;
return 0;
} else {
return 1; // expected-note {{Returning without writing to '*p'}}
}
}
int param_not_written_into_by_func() {
int *p = 0; // expected-note{{'p' initialized to a null pointer value}}
int out = initializer2(&p, 0); // expected-note{{Calling 'initializer2'}}
// expected-note@-1{{Returning from 'initializer2'}}
return *p; // expected-warning{{Dereference of null pointer (loaded from variable 'p')}}
// expected-note@-1{{Dereference of null pointer (loaded from variable 'p')}}
}
void initializer3(int *p, int param) {
if (param) // expected-note{{'param' is 0}}
// expected-note@-1{{Taking false branch}}
*p = 0;
} // expected-note{{Returning without writing to '*p'}}
int param_written_into_by_void_func() {
int p; // expected-note{{'p' declared without an initial value}}
initializer3(&p, 0); // expected-note{{Calling 'initializer3'}}
// expected-note@-1{{Returning from 'initializer3'}}
return p; // expected-warning{{Undefined or garbage value returned to caller}}
// expected-note@-1{{Undefined or garbage value returned to caller}}
}
void initializer4(int *p, int param) {
if (param) // expected-note{{'param' is 0}}
// expected-note@-1{{Taking false branch}}
*p = 0;
} // expected-note{{Returning without writing to '*p'}}
void initializer5(int *p, int param) {
if (!param) // expected-note{{'param' is 1}}
// expected-note@-1{{Taking false branch}}
*p = 0;
} // expected-note{{Returning without writing to '*p'}}
int multi_init_tries_func() {
int p; // expected-note{{'p' declared without an initial value}}
initializer4(&p, 0); // expected-note{{Calling 'initializer4'}}
// expected-note@-1{{Returning from 'initializer4'}}
initializer5(&p, 1); // expected-note{{Calling 'initializer5'}}
// expected-note@-1{{Returning from 'initializer5'}}
return p; // expected-warning{{Undefined or garbage value returned to caller}}
// expected-note@-1{{Undefined or garbage value returned to caller}}
}
int initializer6(const int *p) {
return 0;
}
int no_msg_on_const() {
int p; // expected-note{{'p' declared without an initial value}}
initializer6(&p);
return p; // expected-warning{{Undefined or garbage value returned to caller}}
// expected-note@-1{{Undefined or garbage value returned to caller}}
}
typedef struct {
int x;
} S;
int initializer7(S *s, int param) {
if (param) { // expected-note{{'param' is 0}}
// expected-note@-1{{Taking false branch}}
s->x = 0;
return 0;
}
return 1; // expected-note{{Returning without writing to 's->x'}}
}
int initialize_struct_field() {
S local;
initializer7(&local, 0); // expected-note{{Calling 'initializer7'}}
// expected-note@-1{{Returning from 'initializer7'}}
return local.x; // expected-warning{{Undefined or garbage value returned to caller}}
// expected-note@-1{{Undefined or garbage value returned to caller}}
}
void nullwriter(int **p) {
*p = 0; // expected-note{{Null pointer value stored to 'p'}}
} // no extra note
int usage() {
int x = 0;
int *p = &x;
nullwriter(&p); // expected-note{{Calling 'nullwriter'}}
// expected-note@-1{{Returning from 'nullwriter'}}
return *p; // expected-warning{{Dereference of null pointer (loaded from variable 'p')}}
// expected-note@-1{{Dereference of null pointer (loaded from variable 'p')}}
}
typedef struct {
int x;
int y;
} A;
void partial_initializer(A *a) {
a->x = 0;
} // expected-note{{Returning without writing to 'a->y'}}
int use_partial_initializer() {
A a;
partial_initializer(&a); // expected-note{{Calling 'partial_initializer'}}
// expected-note@-1{{Returning from 'partial_initializer'}}
return a.y; // expected-warning{{Undefined or garbage value returned to caller}}
// expected-note@-1{{Undefined or garbage value returned to caller}}
}
typedef struct {
int x;
int y;
} B;
typedef struct {
B b;
} C;
void partial_nested_initializer(C *c) {
c->b.x = 0;
} // expected-note{{Returning without writing to 'c->b.y'}}
int use_partial_nested_initializer() {
B localB;
C localC;
localC.b = localB;
partial_nested_initializer(&localC); // expected-note{{Calling 'partial_nested_initializer'}}
// expected-note@-1{{Returning from 'partial_nested_initializer'}}
return localC.b.y; // expected-warning{{Undefined or garbage value returned to caller}}
// expected-note@-1{{Undefined or garbage value returned to caller}}
}
void test_subregion_assignment(C* c) {
B b;
c->b = b;
}
int use_subregion_assignment() {
C c;
test_subregion_assignment(&c); // expected-note{{Calling 'test_subregion_assignment'}}
// expected-note@-1{{Returning from 'test_subregion_assignment'}}
return c.b.x; // expected-warning{{Undefined or garbage value returned to caller}}
// expected-note@-1{{Undefined or garbage value returned to caller}}
}
int confusing_signature(int *);
int confusing_signature(int *p) {
return 0; // expected-note{{Returning without writing to '*p'}}
}
int use_confusing_signature() {
int a; // expected-note {{'a' declared without an initial value}}
confusing_signature(&a); // expected-note{{Calling 'confusing_signature'}}
// expected-note@-1{{Returning from 'confusing_signature'}}
return a; // expected-note{{Undefined or garbage value returned to caller}}
// expected-warning@-1{{Undefined or garbage value returned to caller}}
}
int coin();
int multiindirection(int **p) {
if (coin()) // expected-note{{Assuming the condition is true}}
// expected-note@-1{{Taking true branch}}
return 1; // expected-note{{Returning without writing to '**p'}}
*(*p) = 0;
return 0;
}
int usemultiindirection() {
int a; // expected-note {{'a' declared without an initial value}}
int *b = &a;
multiindirection(&b); // expected-note{{Calling 'multiindirection'}}
// expected-note@-1{{Returning from 'multiindirection'}}
return a; // expected-note{{Undefined or garbage value returned to caller}}
// expected-warning@-1{{Undefined or garbage value returned to caller}}
}
int indirectingstruct(S** s) {
if (coin()) // expected-note{{Assuming the condition is true}}
// expected-note@-1{{Taking true branch}}
return 1; // expected-note{{Returning without writing to '(*s)->x'}}
(*s)->x = 0;
return 0;
}
int useindirectingstruct() {
S s;
S* p = &s;
indirectingstruct(&p); //expected-note{{Calling 'indirectingstruct'}}
//expected-note@-1{{Returning from 'indirectingstruct'}}
return s.x; // expected-warning{{Undefined or garbage value returned to caller}}
// expected-note@-1{{Undefined or garbage value returned to caller}}
}
typedef struct {
int *x;
} D;
void initializeMaybeInStruct(D* pD) {
if (coin()) // expected-note{{Assuming the condition is false}}
// expected-note@-1{{Taking false branch}}
*pD->x = 120;
} // expected-note{{Returning without writing to 'pD->x'}}
int useInitializeMaybeInStruct() {
int z; // expected-note{{'z' declared without an initial value}}
D d;
d.x = &z;
initializeMaybeInStruct(&d); // expected-note{{Calling 'initializeMaybeInStruct'}}
// expected-note@-1{{Returning from 'initializeMaybeInStruct'}}
return z; // expected-warning{{Undefined or garbage value returned to caller}}
// expected-note@-1{{Undefined or garbage value returned to caller}}
}
void test_implicit_function_decl(int *x) {
if (x) {} // expected-note{{Assuming 'x' is null}}
// expected-note@-1{{Taking false branch}}
implicit_function(x);
*x = 4; // expected-warning{{Dereference of null pointer (loaded from variable 'x')}}
// expected-note@-1{{Dereference of null pointer (loaded from variable 'x')}}
}
int implicit_function(int *y) {}
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