313 lines
6.7 KiB
C
313 lines
6.7 KiB
C
// RUN: %clang_cc1 -triple i386-apple-darwin10 -analyze -analyzer-checker=core,deadcode,alpha.deadcode.IdempotentOperations,alpha.core -std=gnu99 -analyzer-store=region -analyzer-constraints=range -analyzer-purge=none -verify %s -Wno-error=return-type
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// RUN: %clang_cc1 -triple i386-apple-darwin10 -analyze -analyzer-checker=core,deadcode,alpha.deadcode.IdempotentOperations,alpha.core -std=gnu99 -analyzer-store=region -analyzer-constraints=range -verify %s -Wno-error=return-type
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typedef unsigned uintptr_t;
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extern void __assert_fail (__const char *__assertion, __const char *__file,
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unsigned int __line, __const char *__function)
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__attribute__ ((__noreturn__));
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#define assert(expr) \
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((expr) ? (void)(0) : __assert_fail (#expr, __FILE__, __LINE__, __func__))
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void f1(int *p) {
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if (p) *p = 1;
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else *p = 0; // expected-warning{{ereference}}
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}
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struct foo_struct {
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int x;
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};
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int f2(struct foo_struct* p) {
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if (p)
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p->x = 1;
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return p->x++; // expected-warning{{Access to field 'x' results in a dereference of a null pointer (loaded from variable 'p')}}
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}
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int f3(char* x) {
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int i = 2;
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if (x)
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return x[i - 1];
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return x[i+1]; // expected-warning{{Array access (from variable 'x') results in a null pointer dereference}}
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}
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int f3_b(char* x) {
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int i = 2;
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if (x)
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return x[i - 1];
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return x[i+1]++; // expected-warning{{Array access (from variable 'x') results in a null pointer dereference}}
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}
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int f4(int *p) {
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uintptr_t x = (uintptr_t) p;
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if (x)
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return 1;
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int *q = (int*) x;
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return *q; // expected-warning{{Dereference of null pointer (loaded from variable 'q')}}
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}
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int f4_b() {
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short array[2];
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uintptr_t x = array; // expected-warning{{incompatible pointer to integer conversion}}
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short *p = x; // expected-warning{{incompatible integer to pointer conversion}}
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// The following branch should be infeasible.
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if (!(p == &array[0])) { // expected-warning{{Both operands to '==' always have the same value}}
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p = 0;
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*p = 1; // no-warning
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}
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if (p) {
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*p = 5; // no-warning
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p = 0;
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}
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else return; // expected-warning {{non-void function 'f4_b' should return a value}}
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*p += 10; // expected-warning{{Dereference of null pointer}}
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return 0;
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}
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int f5() {
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char *s = "hello world";
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return s[0]; // no-warning
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}
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int bar(int* p, int q) __attribute__((nonnull));
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int f6(int *p) {
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return !p ? bar(p, 1) // expected-warning {{Null pointer passed as an argument to a 'nonnull' parameter}}
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: bar(p, 0); // no-warning
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}
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int bar2(int* p, int q) __attribute__((nonnull(1)));
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int f6b(int *p) {
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return !p ? bar2(p, 1) // expected-warning {{Null pointer passed as an argument to a 'nonnull' parameter}}
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: bar2(p, 0); // no-warning
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}
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int bar3(int*p, int q, int *r) __attribute__((nonnull(1,3)));
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int f6c(int *p, int *q) {
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return !p ? bar3(q, 2, p) // expected-warning {{Null pointer passed as an argument to a 'nonnull' parameter}}
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: bar3(p, 2, q); // no-warning
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}
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void f6d(int *p) {
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bar(p, 0);
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// At this point, 'p' cannot be null.
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if (!p) {
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int *q = 0;
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*q = 0xDEADBEEF; // no-warning
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}
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}
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void f6e(int *p, int offset) {
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// PR7406 - crash from treating an UnknownVal as defined, to see if it's 0.
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bar((p+offset)+1, 0); // not crash
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}
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int* qux();
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int f7(int x) {
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int* p = 0;
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if (0 == x)
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p = qux();
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if (0 == x)
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*p = 1; // no-warning
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return x;
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}
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int* f7b(int *x) {
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int* p = 0;
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if (((void*)0) == x)
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p = qux();
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if (((void*)0) == x)
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*p = 1; // no-warning
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return x;
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}
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int* f7c(int *x) {
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int* p = 0;
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if (((void*)0) == x)
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p = qux();
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if (((void*)0) != x)
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return x;
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// If we reach here then 'p' is not null.
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*p = 1; // no-warning
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return x;
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}
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int* f7c2(int *x) {
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int* p = 0;
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if (((void*)0) == x)
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p = qux();
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if (((void*)0) == x)
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return x;
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*p = 1; // expected-warning{{null}}
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return x;
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}
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void f8(int *p, int *q) {
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if (!p)
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if (p)
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*p = 1; // no-warning
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if (q)
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if (!q)
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*q = 1; // no-warning
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}
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int* qux();
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int f9(unsigned len) {
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assert (len != 0);
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int *p = 0;
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unsigned i;
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for (i = 0; i < len; ++i)
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p = qux(i);
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return *p++; // no-warning
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}
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int f9b(unsigned len) {
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assert (len > 0); // note use of '>'
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int *p = 0;
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unsigned i;
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for (i = 0; i < len; ++i)
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p = qux(i);
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return *p++; // no-warning
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}
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int* f10(int* p, signed char x, int y) {
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// This line tests symbolication with compound assignments where the
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// LHS and RHS have different bitwidths. The new symbolic value
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// for 'x' should have a bitwidth of 8.
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x &= y;
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// This tests that our symbolication worked, and that we correctly test
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// x against 0 (with the same bitwidth).
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if (!x) {
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if (!p) return 0;
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*p = 10;
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}
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else p = 0;
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if (!x)
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*p = 5; // no-warning
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return p;
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}
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// Test case from <rdar://problem/6407949>
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void f11(unsigned i) {
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int *x = 0;
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if (i >= 0) { // expected-warning{{always true}}
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// always true
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} else {
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*x = 42; // no-warning
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}
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}
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void f11b(unsigned i) {
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int *x = 0;
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if (i <= ~(unsigned)0) {
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// always true
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} else {
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*x = 42; // no-warning
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}
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}
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// Test case for switch statements with weird case arms.
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typedef int BOOL, *PBOOL, *LPBOOL;
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typedef long LONG_PTR, *PLONG_PTR;
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typedef unsigned long ULONG_PTR, *PULONG_PTR;
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typedef ULONG_PTR DWORD_PTR, *PDWORD_PTR;
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typedef LONG_PTR LRESULT;
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typedef struct _F12ITEM *HF12ITEM;
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void f12(HF12ITEM i, char *q) {
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char *p = 0;
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switch ((DWORD_PTR) i) {
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case 0 ... 10:
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p = q;
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break;
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case (DWORD_PTR) ((HF12ITEM) - 65535):
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return;
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default:
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return;
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}
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*p = 1; // no-warning
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}
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// Test handling of translating between integer "pointers" and back.
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void f13() {
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int *x = 0;
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if (((((int) x) << 2) + 1) >> 1) *x = 1;
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}
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// PR 4759 - Attribute non-null checking by the analyzer was not correctly
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// handling pointer values that were undefined.
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void pr4759_aux(int *p) __attribute__((nonnull));
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void pr4759() {
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int *p;
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pr4759_aux(p); // expected-warning{{Function call argument is an uninitialized value}}
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}
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// Relax function call arguments invalidation to be aware of const
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// arguments. Test with function pointers. radar://10595327
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void ttt(const int *nptr);
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void ttt2(const int *nptr);
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typedef void (*NoConstType)(int*);
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int foo10595327(int b) {
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void (*fp)(int *);
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// We use path sensitivity to get the function declaration. Even when the
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// function pointer is cast to non pointer-to-const parameter type, we can
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// find the right function declaration.
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if (b > 5)
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fp = (NoConstType)ttt2;
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else
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fp = (NoConstType)ttt;
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int x = 3;
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int y = x + 1;
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int *p = 0;
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fp(&y);
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if (x == y)
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return *p; // no-warning
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return 0;
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}
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