llvm-project/clang/test/Analysis/misc-ps-eager-assume.m

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// RUN: clang -analyze -checker-cfref --analyzer-store=region -analyzer-constraints=range --verify -fblocks %s -analyzer-eagerly-assume
// Delta-reduced header stuff (needed for test cases).
typedef signed char BOOL;
typedef unsigned int NSUInteger;
typedef struct _NSZone NSZone;
@class NSInvocation, NSMethodSignature, NSCoder, NSString, NSEnumerator;
@protocol NSObject - (BOOL)isEqual:(id)object;
- (oneway void)release;
@end @protocol NSCopying - (id)copyWithZone:(NSZone *)zone;
@end @protocol NSMutableCopying - (id)mutableCopyWithZone:(NSZone *)zone;
@end @protocol NSCoding - (void)encodeWithCoder:(NSCoder *)aCoder;
@end @interface NSObject <NSObject> {}
+ (id)alloc;
@end typedef struct {}
NSFastEnumerationState;
@protocol NSFastEnumeration - (NSUInteger)countByEnumeratingWithState:(NSFastEnumerationState *)state objects:(id *)stackbuf count:(NSUInteger)len;
@end @interface NSArray : NSObject <NSCopying, NSMutableCopying, NSCoding, NSFastEnumeration> - (NSUInteger)count;
@end @interface NSMutableArray : NSArray - (void)addObject:(id)anObject;
- (BOOL)isEqualToString:(NSString *)aString;
@end @interface NSAutoreleasePool : NSObject {}
- (void)drain;
- (id)init;
@end
// This test case tests that (x != 0) is eagerly evaluated before stored to
// 'y'. This test case complements recoverCastedSymbol (see below) because
// the symbolic expression is stored to 'y' (which is a short instead of an
// int). recoverCastedSymbol() only recovers path-sensitivity when the
// symbolic expression is literally the branch condition.
//
void handle_assign_of_condition(int x) {
// The cast to 'short' causes us to lose symbolic constraint.
short y = (x != 0);
char *p = 0;
if (y) {
// This should be infeasible.
if (!(x != 0)) {
*p = 1; // no-warning
}
}
}
// From <rdar://problem/6619921>
//
// In this test case, 'needsAnArray' is a signed char. The analyzer tracks
// a symbolic value for this variable, but in the branch condition it is
// promoted to 'int'. Currently the analyzer doesn't reason well about
// promotions of symbolic values, so this test case tests the logic in
// 'recoverCastedSymbol()' (GRExprEngine.cpp) to test that we recover
// path-sensitivity and use the symbol for 'needsAnArray' in the branch
// condition.
//
void handle_symbolic_cast_in_condition(void) {
NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
BOOL needsAnArray = [@"aString" isEqualToString:@"anotherString"];
NSMutableArray* array = needsAnArray ? [[NSMutableArray alloc] init] : 0;
if(needsAnArray)
[array release];
[pool drain];
}