derek.holloway
7502bf64a4
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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
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// RUN: %clang_analyze_cc1 %s -analyzer-checker=core.NullDereference -analyzer-output=plist -o %t
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// RUN: %normalize_plist <%t | diff -ub %S/Inputs/expected-plists/conditional-path-notes.c.plist -
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void testCondOp(int *p) {
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int *x = p ? p : p;
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// expected-note@-1 {{Assuming 'p' is null}}
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// expected-note@-2 {{'?' condition is false}}
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// expected-note@-3 {{'x' initialized to a null pointer value}}
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*x = 1; // expected-warning{{Dereference of null pointer (loaded from variable 'x')}}
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// expected-note@-1 {{Dereference of null pointer (loaded from variable 'x')}}
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}
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void testCondProblem(int *p) {
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if (p) return;
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// expected-note@-1 {{Assuming 'p' is null}}
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// expected-note@-2 {{Taking false branch}}
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int x = *p ? 0 : 1; // expected-warning{{Dereference of null pointer (loaded from variable 'p')}}
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// expected-note@-1 {{Dereference of null pointer (loaded from variable 'p')}}
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(void)x;
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}
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void testLHSProblem(int *p) {
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int x = !p ? *p : 1; // expected-warning{{Dereference of null pointer (loaded from variable 'p')}}
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// expected-note@-1 {{Assuming 'p' is null}}
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// expected-note@-2 {{'?' condition is true}}
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// expected-note@-3 {{Dereference of null pointer (loaded from variable 'p')}}
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(void)x;
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}
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void testRHSProblem(int *p) {
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int x = p ? 1 : *p; // expected-warning{{Dereference of null pointer (loaded from variable 'p')}}
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// expected-note@-1 {{Assuming 'p' is null}}
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// expected-note@-2 {{'?' condition is false}}
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// expected-note@-3 {{Dereference of null pointer (loaded from variable 'p')}}
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(void)x;
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}
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void testBinaryCondOp(int *p) {
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int *x = p ?: p;
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// expected-note@-1 {{'?' condition is false}}
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// expected-note@-2 {{'x' initialized to a null pointer value}}
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*x = 1; // expected-warning{{Dereference of null pointer (loaded from variable 'x')}}
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// expected-note@-1 {{Dereference of null pointer (loaded from variable 'x')}}
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}
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void testBinaryLHSProblem(int *p) {
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if (p) return;
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// expected-note@-1 {{Assuming 'p' is null}}
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// expected-note@-2 {{Taking false branch}}
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int x = *p ?: 1; // expected-warning{{Dereference of null pointer (loaded from variable 'p')}}
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// expected-note@-1 {{Dereference of null pointer (loaded from variable 'p')}}
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(void)x;
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}
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void testDiagnosableBranch(int a) {
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if (a) {
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// expected-note@-1 {{Assuming 'a' is not equal to 0}}
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// expected-note@-2 {{Taking true branch}}
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*(volatile int *)0 = 1; // expected-warning{{Dereference of null pointer}}
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// expected-note@-1 {{Dereference of null pointer}}
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}
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}
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void testDiagnosableBranchLogical(int a, int b) {
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if (a && b) {
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// expected-note@-1 {{Assuming 'a' is not equal to 0}}
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// expected-note@-2 {{Left side of '&&' is true}}
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// expected-note@-3 {{Assuming 'b' is not equal to 0}}
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// expected-note@-4 {{Taking true branch}}
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*(volatile int *)0 = 1; // expected-warning{{Dereference of null pointer}}
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// expected-note@-1 {{Dereference of null pointer}}
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}
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}
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void testNonDiagnosableBranchArithmetic(int a, int b) {
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if (a - b) {
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// expected-note@-1 {{Taking true branch}}
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// expected-note@-2 {{Assuming the condition is true}}
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*(volatile int *)0 = 1; // expected-warning{{Dereference of null pointer}}
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// expected-note@-1 {{Dereference of null pointer}}
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}
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}
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