path-notes.c
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// RUN: %clang_analyze_cc1 -analyzer-checker=core -analyzer-output=text -analyzer-config suppress-null-return-paths=false -verify %s
// RUN: %clang_analyze_cc1 -analyzer-checker=core -analyzer-output=plist-multi-file -analyzer-config suppress-null-return-paths=false %s -o %t.plist
// RUN: %normalize_plist <%t.plist | diff -ub %S/Inputs/expected-plists/path-notes.c.plist -
void zero(int **p) {
*p = 0;
// expected-note@-1 {{Null pointer value stored to 'a'}}
}
void testZero(int *a) {
zero(&a);
// expected-note@-1 {{Calling 'zero'}}
// expected-note@-2 {{Returning from 'zero'}}
*a = 1; // expected-warning{{Dereference of null pointer}}
// expected-note@-1 {{Dereference of null pointer (loaded from variable 'a')}}
}
void testCheck(int *a) {
if (a) {
// expected-note@-1 + {{Assuming 'a' is null}}
// expected-note@-2 + {{Taking false branch}}
;
}
*a = 1; // expected-warning{{Dereference of null pointer}}
// expected-note@-1 {{Dereference of null pointer (loaded from variable 'a')}}
}
int *getPointer();
void testInitCheck() {
int *a = getPointer();
// expected-note@-1 {{'a' initialized here}}
if (a) {
// expected-note@-1 + {{Assuming 'a' is null}}
// expected-note@-2 + {{Taking false branch}}
;
}
*a = 1; // expected-warning{{Dereference of null pointer}}
// expected-note@-1 {{Dereference of null pointer (loaded from variable 'a')}}
}
void testStoreCheck(int *a) {
a = getPointer();
// expected-note@-1 {{Value assigned to 'a'}}
if (a) {
// expected-note@-1 + {{Assuming 'a' is null}}
// expected-note@-2 + {{Taking false branch}}
;
}
*a = 1; // expected-warning{{Dereference of null pointer}}
// expected-note@-1 {{Dereference of null pointer (loaded from variable 'a')}}
}
int *getZero() {
int *p = 0;
// expected-note@-1 + {{'p' initialized to a null pointer value}}
// ^ This note checks that we add a second visitor for the return value.
return p;
// expected-note@-1 + {{Returning null pointer (loaded from 'p')}}
}
void testReturnZero() {
*getZero() = 1; // expected-warning{{Dereference of null pointer}}
// expected-note@-1 {{Calling 'getZero'}}
// expected-note@-2 {{Returning from 'getZero'}}
// expected-note@-3 {{Dereference of null pointer}}
}
int testReturnZero2() {
return *getZero(); // expected-warning{{Dereference of null pointer}}
// expected-note@-1 {{Calling 'getZero'}}
// expected-note@-2 {{Returning from 'getZero'}}
// expected-note@-3 {{Dereference of null pointer}}
}
void testInitZero() {
int *a = getZero();
// expected-note@-1 {{Calling 'getZero'}}
// expected-note@-2 {{Returning from 'getZero'}}
// expected-note@-3 {{'a' initialized to a null pointer value}}
*a = 1; // expected-warning{{Dereference of null pointer}}
// expected-note@-1 {{Dereference of null pointer (loaded from variable 'a')}}
}
void testStoreZero(int *a) {
a = getZero();
// expected-note@-1 {{Calling 'getZero'}}
// expected-note@-2 {{Returning from 'getZero'}}
// expected-note@-3 {{Null pointer value stored to 'a'}}
*a = 1; // expected-warning{{Dereference of null pointer}}
// expected-note@-1 {{Dereference of null pointer (loaded from variable 'a')}}
}
void usePointer(int *p) {
*p = 1; // expected-warning{{Dereference of null pointer}}
// expected-note@-1 {{Dereference of null pointer}}
}
void testUseOfNullPointer() {
// Test the case where an argument expression is itself a call.
usePointer(getZero());
// expected-note@-1 {{Calling 'getZero'}}
// expected-note@-2 {{Returning from 'getZero'}}
// expected-note@-3 {{Passing null pointer value via 1st parameter 'p'}}
// expected-note@-4 {{Calling 'usePointer'}}
}
struct X { char *p; };
void setFieldToNull(struct X *x) {
x->p = 0; // expected-note {{Null pointer value stored to field 'p'}}
}
int testSetFieldToNull(struct X *x) {
setFieldToNull(x); // expected-note {{Calling 'setFieldToNull'}}
// expected-note@-1{{Returning from 'setFieldToNull'}}
return *x->p;
// expected-warning@-1 {{Dereference of null pointer (loaded from field 'p')}}
// expected-note@-2 {{Dereference of null pointer (loaded from field 'p')}}
}
struct Outer {
struct Inner {
int *p;
} inner;
};
void test(struct Outer *wrapperPtr) {
wrapperPtr->inner.p = 0; // expected-note {{Null pointer value stored to field 'p'}}
*wrapperPtr->inner.p = 1; //expected-warning {{Dereference of null pointer (loaded from field 'p')}}
// expected-note@-1 {{Dereference of null pointer (loaded from field 'p')}}
}
void test4(int **p) {
if (*p) return; // expected-note {{Taking false branch}}
// expected-note@-1 {{Assuming pointer value is null}}
**p = 1; // expected-warning {{Dereference of null pointer}}
// expected-note@-1 {{Dereference of null pointer}}
}
void boringCallee() {
}
void interestingCallee(int *x) {
*x = 0; // expected-note{{The value 0 is assigned to 'x'}}
boringCallee(); // no-note
}
int testBoringCalleeOfInterestingCallee() {
int x;
interestingCallee(&x); // expected-note{{Calling 'interestingCallee'}}
// expected-note@-1{{Returning from 'interestingCallee'}}
return 1 / x; // expected-warning{{Division by zero}}
// expected-note@-1{{Division by zero}}
}