1 // RUN: %clang_analyze_cc1 %s -analyzer-checker=core.NullDereference -analyzer-output=text -verify 2 // RUN: %clang_analyze_cc1 %s -analyzer-checker=core.NullDereference -analyzer-output=plist -o %t 3 // RUN: %normalize_plist <%t | diff -ub %S/Inputs/expected-plists/conditional-path-notes.c.plist - 4 5 void testCondOp(int *p) { 6 int *x = p ? p : p; 7 // expected-note@-1 {{Assuming 'p' is null}} 8 // expected-note@-2 {{'?' condition is false}} 9 // expected-note@-3 {{'x' initialized to a null pointer value}} 10 *x = 1; // expected-warning{{Dereference of null pointer (loaded from variable 'x')}} 11 // expected-note@-1 {{Dereference of null pointer (loaded from variable 'x')}} 12 } 13 14 void testCondProblem(int *p) { 15 if (p) return; 16 // expected-note@-1 {{Assuming 'p' is null}} 17 // expected-note@-2 {{Taking false branch}} 18 19 int x = *p ? 0 : 1; // expected-warning{{Dereference of null pointer (loaded from variable 'p')}} 20 // expected-note@-1 {{Dereference of null pointer (loaded from variable 'p')}} 21 (void)x; 22 } 23 24 void testLHSProblem(int *p) { 25 int x = !p ? *p : 1; // expected-warning{{Dereference of null pointer (loaded from variable 'p')}} 26 // expected-note@-1 {{Assuming 'p' is null}} 27 // expected-note@-2 {{'?' condition is true}} 28 // expected-note@-3 {{Dereference of null pointer (loaded from variable 'p')}} 29 (void)x; 30 } 31 32 void testRHSProblem(int *p) { 33 int x = p ? 1 : *p; // expected-warning{{Dereference of null pointer (loaded from variable 'p')}} 34 // expected-note@-1 {{Assuming 'p' is null}} 35 // expected-note@-2 {{'?' condition is false}} 36 // expected-note@-3 {{Dereference of null pointer (loaded from variable 'p')}} 37 (void)x; 38 } 39 40 void testBinaryCondOp(int *p) { 41 int *x = p ?: p; 42 // expected-note@-1 {{'?' condition is false}} 43 // expected-note@-2 {{'x' initialized to a null pointer value}} 44 *x = 1; // expected-warning{{Dereference of null pointer (loaded from variable 'x')}} 45 // expected-note@-1 {{Dereference of null pointer (loaded from variable 'x')}} 46 } 47 48 void testBinaryLHSProblem(int *p) { 49 if (p) return; 50 // expected-note@-1 {{Assuming 'p' is null}} 51 // expected-note@-2 {{Taking false branch}} 52 53 int x = *p ?: 1; // expected-warning{{Dereference of null pointer (loaded from variable 'p')}} 54 // expected-note@-1 {{Dereference of null pointer (loaded from variable 'p')}} 55 (void)x; 56 } 57 58 void testDiagnosableBranch(int a) { 59 if (a) { 60 // expected-note@-1 {{Assuming 'a' is not equal to 0}} 61 // expected-note@-2 {{Taking true branch}} 62 *(volatile int *)0 = 1; // expected-warning{{Dereference of null pointer}} 63 // expected-note@-1 {{Dereference of null pointer}} 64 } 65 } 66 67 void testDiagnosableBranchLogical(int a, int b) { 68 if (a && b) { 69 // expected-note@-1 {{Assuming 'a' is not equal to 0}} 70 // expected-note@-2 {{Left side of '&&' is true}} 71 // expected-note@-3 {{Assuming 'b' is not equal to 0}} 72 // expected-note@-4 {{Taking true branch}} 73 *(volatile int *)0 = 1; // expected-warning{{Dereference of null pointer}} 74 // expected-note@-1 {{Dereference of null pointer}} 75 } 76 } 77 78 void testNonDiagnosableBranchArithmetic(int a, int b) { 79 if (a - b) { 80 // expected-note@-1 {{Taking true branch}} 81 // expected-note@-2 {{Assuming the condition is true}} 82 *(volatile int *)0 = 1; // expected-warning{{Dereference of null pointer}} 83 // expected-note@-1 {{Dereference of null pointer}} 84 } 85 } 86 87