// RUN: %clang_analyze_cc1 -analyzer-checker=core -fblocks -verify -analyzer-output=text %s
struct FPRec {
void (*my_func)(int * x);
};
int bar(int x);
int f1_a(struct FPRec* foo) {
int x;
(*foo->my_func)(&x);
return bar(x)+1; // no-warning
}
int f1_b(void) {
int x; // expected-note{{'x' declared without an initial value}}
return bar(x)+1; // expected-warning{{1st function call argument is an uninitialized value}}
// expected-note@-1{{1st function call argument is an uninitialized value}}
}
int f2(void) {
int x; // expected-note{{'x' declared without an initial value}}
if (x+1) // expected-warning{{The left operand of '+' is a garbage value}}
// expected-note@-1{{The left operand of '+' is a garbage value}}
return 1;
return 2;
}
int f2_b(void) {
int x; // expected-note{{'x' declared without an initial value}}
return ((1+x)+2+((x))) + 1 ? 1 : 2; // expected-warning{{The right operand of '+' is a garbage value}}
// expected-note@-1{{The right operand of '+' is a garbage value}}
}
int f3(void) {
int i; // expected-note{{'i' declared without an initial value}}
int *p = &i;
if (*p > 0) // expected-warning{{The left operand of '>' is a garbage value}}
// expected-note@-1{{The left operand of '>' is a garbage value}}
return 0;
else
return 1;
}
void f4_aux(float* x);
float f4(void) {
float x;
f4_aux(&x);
return x; // no-warning
}
struct f5_struct { int x; };
void f5_aux(struct f5_struct* s);
int f5(void) {
struct f5_struct s;
f5_aux(&s);
return s.x; // no-warning
}
void f6(int x) {
int a[20];
if (x == 25) {} // expected-note{{Assuming 'x' is equal to 25}}
// expected-note@-1{{Taking true branch}}
if (a[x] == 123) {} // expected-warning{{The left operand of '==' is a garbage value due to array index out of bounds}}
// expected-note@-1{{The left operand of '==' is a garbage value due to array index out of bounds}}
}
int ret_uninit(void) {
int i; // expected-note{{'i' declared without an initial value}}
int *p = &i;
return *p; // expected-warning{{Undefined or garbage value returned to caller}}
// expected-note@-1{{Undefined or garbage value returned to caller}}
}
typedef unsigned char Boolean;
typedef const struct __CFNumber * CFNumberRef;
typedef signed long CFIndex;
typedef CFIndex CFNumberType;
typedef unsigned long UInt32;
typedef UInt32 CFStringEncoding;
typedef const struct __CFString * CFStringRef;
extern Boolean CFNumberGetValue(CFNumberRef number, CFNumberType theType, void *valuePtr);
extern CFStringRef CFStringConvertEncodingToIANACharSetName(CFStringEncoding encoding);
CFStringRef rdar_6451816(CFNumberRef nr) {
CFStringEncoding encoding;
// &encoding is casted to void*. This test case tests whether or not
// we properly invalidate the value of 'encoding'.
CFNumberGetValue(nr, 9, &encoding);
return CFStringConvertEncodingToIANACharSetName(encoding); // no-warning
}
// PR 4630 - false warning with nonnull attribute
// This false positive (due to a regression) caused the analyzer to falsely
// flag a "return of uninitialized value" warning in the first branch due to
// the nonnull attribute.
void pr_4630_aux(char *x, int *y) __attribute__ ((nonnull (1)));
void pr_4630_aux_2(char *x, int *y);
int pr_4630(char *a, int y) {
int x;
if (y) {
pr_4630_aux(a, &x);
return x; // no-warning
}
else {
pr_4630_aux_2(a, &x);
return x; // no-warning
}
}
// PR 4631 - False positive with union initializer
// Previously the analyzer didn't examine the compound initializers of unions,
// resulting in some false positives for initializers with side-effects.
union u_4631 { int a; };
struct s_4631 { int a; };
int pr4631_f2(int *p);
int pr4631_f3(void *q);
int pr4631_f1(void)
{
int x;
union u_4631 m = { pr4631_f2(&x) };
pr4631_f3(&m); // tell analyzer that we use m
return x; // no-warning
}
int pr4631_f1_b(void)
{
int x;
struct s_4631 m = { pr4631_f2(&x) };
pr4631_f3(&m); // tell analyzer that we use m
return x; // no-warning
}
// FP when returning a void-valued expression from a void function...or block.
void foo_radar12278788(void) { return; }
void test_radar12278788(void) {
return foo_radar12278788(); // no-warning
}
void foo_radar12278788_fp(void) { return; }
typedef int (*RetIntFuncType)(void);
typedef void (*RetVoidFuncType)(void);
int test_radar12278788_FP(void) {
RetVoidFuncType f = foo_radar12278788_fp;
return ((RetIntFuncType)f)(); //expected-warning {{Undefined or garbage value returned to caller}}
//expected-note@-1 {{Undefined or garbage value returned to caller}}
}
void rdar13665798(void) {
^(void) {
return foo_radar12278788(); // no-warning
}();
^void(void) {
return foo_radar12278788(); // no-warning
}();
^int(void) { // expected-note{{Calling anonymous block}}
RetVoidFuncType f = foo_radar12278788_fp;
return ((RetIntFuncType)f)(); //expected-warning {{Undefined or garbage value returned to caller}}
//expected-note@-1 {{Undefined or garbage value returned to caller}}
}();
}
struct Point {
int x, y;
};
struct Point getHalfPoint(void) {
struct Point p;
p.x = 0;
return p;
}
void use(struct Point p);
void testUseHalfPoint(void) {
struct Point p = getHalfPoint(); // expected-note{{'p' initialized here}}
use(p); // expected-warning{{uninitialized}}
// expected-note@-1{{uninitialized}}
}
void testUseHalfPoint2(void) {
struct Point p;
p = getHalfPoint(); // expected-note{{Value assigned to 'p'}}
use(p); // expected-warning{{uninitialized}}
// expected-note@-1{{uninitialized}}
}
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