87 lines
3.3 KiB
C
87 lines
3.3 KiB
C
|
// RUN: %clang_analyze_cc1 %s -analyzer-checker=core.NullDereference -analyzer-output=text -verify
|
||
|
|
// RUN: %clang_analyze_cc1 %s -analyzer-checker=core.NullDereference -analyzer-output=plist -o %t
|
||
|
|
// RUN: %normalize_plist <%t | diff -ub %S/Inputs/expected-plists/conditional-path-notes.c.plist -
|
||
|
|
|
||
|
|
void testCondOp(int *p) {
|
||
|
|
int *x = p ? p : p;
|
||
|
|
// expected-note@-1 {{Assuming 'p' is null}}
|
||
|
|
// expected-note@-2 {{'?' condition is false}}
|
||
|
|
// expected-note@-3 {{'x' initialized to a null pointer value}}
|
||
|
|
*x = 1; // expected-warning{{Dereference of null pointer (loaded from variable 'x')}}
|
||
|
|
// expected-note@-1 {{Dereference of null pointer (loaded from variable 'x')}}
|
||
|
|
}
|
||
|
|
|
||
|
|
void testCondProblem(int *p) {
|
||
|
|
if (p) return;
|
||
|
|
// expected-note@-1 {{Assuming 'p' is null}}
|
||
|
|
// expected-note@-2 {{Taking false branch}}
|
||
|
|
|
||
|
|
int x = *p ? 0 : 1; // expected-warning{{Dereference of null pointer (loaded from variable 'p')}}
|
||
|
|
// expected-note@-1 {{Dereference of null pointer (loaded from variable 'p')}}
|
||
|
|
(void)x;
|
||
|
|
}
|
||
|
|
|
||
|
|
void testLHSProblem(int *p) {
|
||
|
|
int x = !p ? *p : 1; // expected-warning{{Dereference of null pointer (loaded from variable 'p')}}
|
||
|
|
// expected-note@-1 {{Assuming 'p' is null}}
|
||
|
|
// expected-note@-2 {{'?' condition is true}}
|
||
|
|
// expected-note@-3 {{Dereference of null pointer (loaded from variable 'p')}}
|
||
|
|
(void)x;
|
||
|
|
}
|
||
|
|
|
||
|
|
void testRHSProblem(int *p) {
|
||
|
|
int x = p ? 1 : *p; // expected-warning{{Dereference of null pointer (loaded from variable 'p')}}
|
||
|
|
// expected-note@-1 {{Assuming 'p' is null}}
|
||
|
|
// expected-note@-2 {{'?' condition is false}}
|
||
|
|
// expected-note@-3 {{Dereference of null pointer (loaded from variable 'p')}}
|
||
|
|
(void)x;
|
||
|
|
}
|
||
|
|
|
||
|
|
void testBinaryCondOp(int *p) {
|
||
|
|
int *x = p ?: p;
|
||
|
|
// expected-note@-1 {{'?' condition is false}}
|
||
|
|
// expected-note@-2 {{'x' initialized to a null pointer value}}
|
||
|
|
*x = 1; // expected-warning{{Dereference of null pointer (loaded from variable 'x')}}
|
||
|
|
// expected-note@-1 {{Dereference of null pointer (loaded from variable 'x')}}
|
||
|
|
}
|
||
|
|
|
||
|
|
void testBinaryLHSProblem(int *p) {
|
||
|
|
if (p) return;
|
||
|
|
// expected-note@-1 {{Assuming 'p' is null}}
|
||
|
|
// expected-note@-2 {{Taking false branch}}
|
||
|
|
|
||
|
|
int x = *p ?: 1; // expected-warning{{Dereference of null pointer (loaded from variable 'p')}}
|
||
|
|
// expected-note@-1 {{Dereference of null pointer (loaded from variable 'p')}}
|
||
|
|
(void)x;
|
||
|
|
}
|
||
|
|
|
||
|
|
void testDiagnosableBranch(int a) {
|
||
|
|
if (a) {
|
||
|
|
// expected-note@-1 {{Assuming 'a' is not equal to 0}}
|
||
|
|
// expected-note@-2 {{Taking true branch}}
|
||
|
|
*(volatile int *)0 = 1; // expected-warning{{Dereference of null pointer}}
|
||
|
|
// expected-note@-1 {{Dereference of null pointer}}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void testDiagnosableBranchLogical(int a, int b) {
|
||
|
|
if (a && b) {
|
||
|
|
// expected-note@-1 {{Assuming 'a' is not equal to 0}}
|
||
|
|
// expected-note@-2 {{Left side of '&&' is true}}
|
||
|
|
// expected-note@-3 {{Assuming 'b' is not equal to 0}}
|
||
|
|
// expected-note@-4 {{Taking true branch}}
|
||
|
|
*(volatile int *)0 = 1; // expected-warning{{Dereference of null pointer}}
|
||
|
|
// expected-note@-1 {{Dereference of null pointer}}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void testNonDiagnosableBranchArithmetic(int a, int b) {
|
||
|
|
if (a - b) {
|
||
|
|
// expected-note@-1 {{Taking true branch}}
|
||
|
|
// expected-note@-2 {{Assuming the condition is true}}
|
||
|
|
*(volatile int *)0 = 1; // expected-warning{{Dereference of null pointer}}
|
||
|
|
// expected-note@-1 {{Dereference of null pointer}}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|