test/Analysis/CFDate.m

// RUN: clang -checker-cfref -verify %s

//===----------------------------------------------------------------------===//
// The following code is reduced using delta-debugging from
// Foundation.h (Mac OS X).
//
// It includes the basic definitions for the test cases below.
// Not including Foundation.h directly makes this test case both svelte and
// portable to non-Mac platforms.
//===----------------------------------------------------------------------===//

typedef const struct __CFAllocator * CFAllocatorRef;
typedef double CFTimeInterval;
typedef CFTimeInterval CFAbsoluteTime;
typedef const struct __CFDate * CFDateRef;
extern CFDateRef CFDateCreate(CFAllocatorRef allocator, CFAbsoluteTime at);
typedef struct objc_object {} *id;
typedef signed char BOOL;
typedef unsigned int NSUInteger;
typedef struct _NSZone NSZone;
@class NSInvocation, NSMethodSignature, NSCoder, NSString, NSEnumerator;
@protocol NSObject  - (BOOL)isEqual:(id)object; - (id)retain; - (oneway void)release; @end
@protocol NSCopying  - (id)copyWithZone:(NSZone *)zone; @end
@protocol NSCoding  - (void)encodeWithCoder:(NSCoder *)aCoder; @end
@interface NSObject <NSObject> {} @end
extern id NSAllocateObject(Class aClass, NSUInteger extraBytes, NSZone *zone);
typedef double NSTimeInterval;
@interface NSDate : NSObject <NSCopying, NSCoding>  - (NSTimeInterval)timeIntervalSinceReferenceDate; @end
@class NSString, NSArray, NSTimeZone;

//===----------------------------------------------------------------------===//
// Test cases.
//===----------------------------------------------------------------------===//

CFAbsoluteTime f1() {
  CFAbsoluteTime t = CFAbsoluteTimeGetCurrent();
  CFDateRef date = CFDateCreate(0, t);
  CFRetain(date);
  CFRelease(date);
  CFDateGetAbsoluteTime(date); // no-warning
  CFRelease(date);
  t = CFDateGetAbsoluteTime(date);   // expected-warning{{Reference-counted object is used after it is released.}}
  return t;
}

CFAbsoluteTime f2() {
  CFAbsoluteTime t = CFAbsoluteTimeGetCurrent();
  CFDateRef date = CFDateCreate(0, t);  
  [((NSDate*) date) retain];
  CFRelease(date);
  CFDateGetAbsoluteTime(date); // no-warning
  [((NSDate*) date) release];
  t = CFDateGetAbsoluteTime(date);   // expected-warning{{Reference-counted object is used after it is released.}}
  return t;
}


NSDate* global_x;

  // Test to see if we supresss an error when we store the pointer
  // to a global.
  
CFAbsoluteTime f3() {
  CFAbsoluteTime t = CFAbsoluteTimeGetCurrent();
  CFDateRef date = CFDateCreate(0, t);  
  [((NSDate*) date) retain];
  CFRelease(date);
  CFDateGetAbsoluteTime(date); // no-warning
  global_x = (NSDate*) date;  
  [((NSDate*) date) release];
  t = CFDateGetAbsoluteTime(date);   // no-warning
  return t;
}

// Test to see if we supresss an error when we store the pointer
// to a struct.

struct foo {
  NSDate* f;
};

CFAbsoluteTime f4() {
  struct foo x;
  
  CFAbsoluteTime t = CFAbsoluteTimeGetCurrent();
  CFDateRef date = CFDateCreate(0, t);  
  [((NSDate*) date) retain];
  CFRelease(date);
  CFDateGetAbsoluteTime(date); // no-warning
  x.f = (NSDate*) date;  
  [((NSDate*) date) release];
  t = CFDateGetAbsoluteTime(date);   // no-warning
  return t;
}

// Test a leak.

CFAbsoluteTime f5(int x) {  
  CFAbsoluteTime t = CFAbsoluteTimeGetCurrent();
  CFDateRef date = CFDateCreate(0, t);
  
  if (x)
    CFRelease(date);

  return t; // expected-warning{{leak}}
}

// Test a leak involving the return.

CFDateRef f6(int x) {  
  CFDateRef date = CFDateCreate(0, CFAbsoluteTimeGetCurrent());
  CFRetain(date);
  return date; // expected-warning{{leak}}
}

// Test a leak involving an overwrite.

CFDateRef f7() {
  CFDateRef date = CFDateCreate(0, CFAbsoluteTimeGetCurrent());
  CFRetain(date); //expected-warning{{leak}}
  date = CFDateCreate(0, CFAbsoluteTimeGetCurrent()); 
  return date;
}

// Generalization of Create rule.  MyDateCreate returns a CFXXXTypeRef, and
// has the word create.

CFDateRef MyDateCreate();

CFDateRef f8() {
  CFDateRef date = MyDateCreate();
  CFRetain(date);  
  return date; // expected-warning{{leak}}
}

CFDateRef f9() {
  CFDateRef date = CFDateCreate(0, CFAbsoluteTimeGetCurrent());
  int *p = 0;
  // test that the checker assumes that CFDateCreate returns a non-null
  // pointer
  if (!date) *p = 1; // no-warning
  return date;
}