// NOTE: Use '-fobjc-gc' to test the analysis being run twice, and multiple reports are not issued.
// RUN: %clang_analyze_cc1 -triple i386-apple-darwin10 -analyzer-checker=core,alpha.core,osx.cocoa.AtSync -Wno-strict-prototypes -Wno-pointer-to-int-cast -verify -fblocks -Wno-unreachable-code -Wno-null-dereference -Wno-objc-root-class %s
// RUN: %clang_analyze_cc1 -triple x86_64-apple-darwin10 -analyzer-checker=core,alpha.core,osx.cocoa.AtSync -Wno-strict-prototypes -Wno-pointer-to-int-cast -verify -fblocks -Wno-unreachable-code -Wno-null-dereference -Wno-objc-root-class %s
#ifndef __clang_analyzer__
#error __clang_analyzer__ not defined
#endif
typedef struct objc_ivar *Ivar;
typedef struct objc_selector *SEL;
typedef signed char BOOL;
typedef int NSInteger;
typedef unsigned int NSUInteger;
typedef struct _NSZone NSZone;
@class NSInvocation, NSArray, NSMethodSignature, NSCoder, NSString, NSEnumerator;
@protocol NSObject
- (BOOL)isEqual:(id)object;
- (id)autorelease;
@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)init;
+ (id)allocWithZone:(NSZone *)zone;
@end
extern id NSAllocateObject(Class aClass, NSUInteger extraBytes, NSZone *zone);
@interface NSString : NSObject <NSCopying, NSMutableCopying, NSCoding>
- (NSUInteger)length;
+ (id)stringWithUTF8String:(const char *)nullTerminatedCString;
@end extern NSString * const NSBundleDidLoadNotification;
@interface NSValue : NSObject <NSCopying, NSCoding>
- (void)getValue:(void *)value;
@end
@interface NSNumber : NSValue
- (char)charValue;
- (id)initWithBool:(BOOL)value;
@end
@interface NSAssertionHandler : NSObject {}
+ (NSAssertionHandler *)currentHandler;
- (void)handleFailureInMethod:(SEL)selector object:(id)object file:(NSString *)fileName lineNumber:(NSInteger)line description:(NSString *)format,...;
@end
extern NSString * const NSConnectionReplyMode;
typedef float CGFloat;
typedef struct _NSPoint {
CGFloat x;
CGFloat y;
} NSPoint;
typedef struct _NSSize {
CGFloat width;
CGFloat height;
} NSSize;
typedef struct _NSRect {
NSPoint origin;
NSSize size;
} NSRect;
@interface A @end
@implementation A
- (void)foo:(void (^)(NSObject *x))block {
if (!((block != ((void *)0)))) {}
}
@end
// Reduced test case from crash in PR 2796;
// http://llvm.org/bugs/show_bug.cgi?id=2796
unsigned foo(unsigned x) { return __alignof__((x)) + sizeof(x); }
// Improvement to path-sensitivity involving compound assignments.
unsigned r6268365Aux(void);
void r6268365(void) {
unsigned x = 0;
x &= r6268365Aux();
unsigned j = 0;
if (x == 0) ++j;
if (x == 0) x = x / j;
}
void divzeroassume(unsigned x, unsigned j) {
x /= j;
if (j == 0) x /= 0; // no static-analyzer warning expected-warning {{division by zero is undefined}}
if (j == 0) x /= j; // no static-analyzer warning
if (j == 0) x = x / 0; // no static-analyzer warning expected-warning {{division by zero is undefined}}
}
void divzeroassumeB(unsigned x, unsigned j) {
x = x / j;
if (j == 0) x /= 0; // no static-analyzer warning expected-warning {{division by zero is undefined}}
if (j == 0) x /= j; // no static-analyzer warning
if (j == 0) x = x / 0; // no static-analyzer warning expected-warning {{division by zero is undefined}}
}
// InitListExpr processing
typedef float __m128 __attribute__((__vector_size__(16), __may_alias__));
__m128 return128(void) {
// This compound literal has a Vector type. We currently just
// return UnknownVal.
return __extension__(__m128) { 0.0f, 0.0f, 0.0f, 0.0f };
}
typedef long long __v2di __attribute__ ((__vector_size__ (16)));
typedef long long __m128i __attribute__ ((__vector_size__ (16), __may_alias__));
__m128i vec128i(long long __q1, long long __q0) {
// This compound literal returns true for both isVectorType() and
// isIntegerType().
return __extension__ (__m128i)(__v2di){ __q0, __q1 };
}
// sizeof(void)
// - Tests a regression reported in PR 3211: http://llvm.org/bugs/show_bug.cgi?id=3211
void handle_sizeof_void(unsigned flag) {
int* p = 0;
if (flag) {
if (sizeof(void) == 1)
return;
// Infeasible.
*p = 1; // no-warning
}
void* q;
if (!flag) {
if (sizeof(*q) == 1)
return;
// Infeasibe.
*p = 1; // no-warning
}
// Infeasible.
*p = 1; // no-warning
}
// check deference of undefined values
void check_deref_undef(void) {
int *p;
*p = 0xDEADBEEF; // expected-warning{{Dereference of undefined pointer value}}
}
// PR 3422
void pr3422_helper(char *p);
void pr3422(void) {
char buf[100];
char *q = &buf[10];
pr3422_helper(&q[1]);
}
// PR 3543 (handle empty statement expressions)
void pr_3543(void) {
({});
}
// This test case test the use of a vector type within an array subscript
// expression.
typedef long long __a64vector __attribute__((__vector_size__(8)));
typedef long long __a128vector __attribute__((__vector_size__(16)));
static inline __a64vector __attribute__((__always_inline__, __nodebug__))
my_test_mm_movepi64_pi64(__a128vector a) {
return (__a64vector)a[0];
}
// Test basic tracking of ivars associated with 'self'.
@interface SelfIvarTest : NSObject {
int flag;
}
- (void)test_self_tracking;
@end
@implementation SelfIvarTest
- (void)test_self_tracking {
char *p = 0;
char c;
if (flag)
p = "hello";
if (flag)
c = *p; // no-warning
}
@end
// PR 3770
char pr3770(int x) {
int y = x & 0x2;
char *p = 0;
if (y == 1)
p = "hello";
if (y == 1)
return p[0]; // no-warning
return 'a';
}
// PR 3772
// - We just want to test that this doesn't crash the analyzer.
typedef struct st ST;
struct st { char *name; };
extern ST *Cur_Pu;
void pr3772(void)
{
static ST *last_Cur_Pu;
if (last_Cur_Pu == Cur_Pu) {
return;
}
}
// PR 3780 - This tests that StmtIterator isn't broken for VLAs in DeclGroups.
void pr3780(int sz) { typedef double MAT[sz][sz]; }
// Test that we don't symbolicate doubles before we are ready to do something
// with them.
int rdar6695527(double x) {
if (!x) { return 0; }
return 1;
}
// Test that we properly invalidate structs passed-by-reference to a function.
void pr6708148_invalidate(NSRect *x);
void pr6708148_use(NSRect x);
void pr6708148_test(void) {
NSRect x;
pr6708148_invalidate(&x);
pr6708148_use(x); // no-warning
}
// Handle both kinds of noreturn attributes for pruning paths.
void rdar_6777003_noret(void) __attribute__((noreturn));
void rdar_6777003_analyzer_noret(void) __attribute__((analyzer_noreturn));
void rdar_6777003(int x) {
int *p = 0;
if (x == 1) {
rdar_6777003_noret();
*p = 1; // no-warning;
}
if (x == 2) {
rdar_6777003_analyzer_noret();
*p = 1; // no-warning;
}
*p = 1; // expected-warning{{Dereference of null pointer}}
}
// Check that the pointer-to-conts arguments do not get invalidated by Obj C
// interfaces.
int rdar_10595327(char *str) {
char fl = str[0];
int *p = 0;
NSString *s = [NSString stringWithUTF8String:str];
if (str[0] != fl)
return *p; // no-warning
return 0;
}
// For pointer arithmetic, --/++ should be treated as preserving non-nullness,
// regardless of how well the underlying StoreManager reasons about pointer
// arithmetic.
void rdar_6777209(char *p) {
if (p == 0)
return;
++p;
// This branch should always be infeasible.
if (p == 0)
*p = 'c'; // no-warning
}
// PR 4033. A symbolic 'void *' pointer can be used as the address for a
// computed goto.
typedef void *Opcode;
Opcode pr_4033_getOpcode(void);
void pr_4033(void) {
void *lbl = &&next_opcode;
next_opcode:
{
Opcode op = pr_4033_getOpcode();
if (op) goto *op;
}
}
// Test invalidating pointers-to-pointers with slightly different types. This
// example came from a recent false positive due to a regression where the
// branch condition was falsely reported as being uninitialized.
void invalidate_by_ref(char **x);
int test_invalidate_by_ref(void) {
unsigned short y;
invalidate_by_ref((char**) &y);
if (y) // no-warning
return 1;
return 0;
}
// This just tests that the CFG is constructed correctly. Previously, the
// successor block of the entrance was the block containing the merge for '?',
// which would trigger an assertion failure.
int rdar_7027684_aux(void);
int rdar_7027684_aux_2(void) __attribute__((noreturn));
void rdar_7027684(int x, int y) {
{}; // this empty compound statement is critical.
(rdar_7027684_aux() ? rdar_7027684_aux_2() : (void) 0);
}
// Test that we handle casts of string literals to arbitrary types.
unsigned const char *string_literal_test1(void) {
return (const unsigned char*) "hello";
}
const float *string_literal_test2(void) {
return (const float*) "hello";
}
// Test that we handle casts *from* incomplete struct types.
extern const struct _FooAssertStruct _cmd;
void test_cast_from_incomplete_struct_aux(volatile const void *x);
void test_cast_from_incomplete_struct(void) {
test_cast_from_incomplete_struct_aux(&_cmd);
}
// "ValueManager::makeIntVal(uint64_t X, QualType T) should return a 'Loc'
// when 'T' is a pointer"
//
// Previously this case would crash.
void test_rdar_7034511(NSArray *y) {
NSObject *x;
for (x in y) {}
if (x == ((void*) 0)) {}
}
// Handle casts of function pointers (CodeTextRegions) to arbitrary pointer
// types. This was previously causing a crash in CastRegion.
void handle_funcptr_voidptr_casts(void) {
void **ptr;
typedef void *PVOID;
typedef void *PCHAR;
typedef long INT_PTR, *PINT_PTR;
typedef INT_PTR (*FARPROC)(void);
FARPROC handle_funcptr_voidptr_casts_aux(void);
PVOID handle_funcptr_voidptr_casts_aux_2(PVOID volatile *x);
PVOID handle_funcptr_voidptr_casts_aux_3(PCHAR volatile *x);
ptr = (void**) handle_funcptr_voidptr_casts_aux();
handle_funcptr_voidptr_casts_aux_2(ptr);
handle_funcptr_voidptr_casts_aux_3(ptr);
}
// RegionStore::Retrieve previously crashed on this example. This example
// was previously in the test file 'xfail_regionstore_wine_crash.c'.
void testA(void) {
long x = 0;
char *y = (char *) &x;
if (!*y)
return;
}
// RegionStoreManager previously crashed on this example. The problem is that
// the value bound to the field of b->grue after the call to testB_aux is
// a symbolic region. The second '*__gruep__' involves performing a load
// from a 'int*' that really is a 'void**'. The loaded location must be
// implicitly converted to an integer that wraps a location. Previosly we would
// get a crash here due to an assertion failure.
typedef struct _BStruct { void *grue; } BStruct;
void testB_aux(void *ptr);
void testB(BStruct *b) {
{
int *__gruep__ = ((int *)&((b)->grue));
int __gruev__ = *__gruep__;
testB_aux(__gruep__);
}
{
int *__gruep__ = ((int *)&((b)->grue));
int __gruev__ = *__gruep__;
if (~0 != __gruev__) {}
}
}
void test_trivial_symbolic_comparison(int *x) {
int test_trivial_symbolic_comparison_aux(void);
int a = test_trivial_symbolic_comparison_aux();
int b = a;
if (a != b) {
int *p = 0;
*p = 0xDEADBEEF; // no-warning
}
a = a == 1;
b = b == 1;
if (a != b) {
int *p = 0;
*p = 0xDEADBEEF; // no-warning
}
}
// Test for:
// false positive null dereference due to BasicStoreManager not tracking
// *static* globals
//
// This just tests the proper tracking of symbolic values for globals (both
// static and non-static).
//
static int* x_rdar_7062158;
void rdar_7062158(void) {
int *current = x_rdar_7062158;
if (current == x_rdar_7062158)
return;
int *p = 0;
*p = 0xDEADBEEF; // no-warning
}
int* x_rdar_7062158_2;
void rdar_7062158_2(void) {
int *current = x_rdar_7062158_2;
if (current == x_rdar_7062158_2)
return;
int *p = 0;
*p = 0xDEADBEEF; // no-warning
}
// This test reproduces a case for a crash when analyzing ClamAV using
// RegionStoreManager (the crash doesn't exhibit in BasicStoreManager because
// it isn't doing anything smart about arrays). The problem is that on the
// second line, 'p = &p[i]', p is assigned an ElementRegion whose index
// is a 16-bit integer. On the third line, a new ElementRegion is created
// based on the previous region, but there the region uses a 32-bit integer,
// resulting in a clash of values (an assertion failure at best). We resolve
// this problem by implicitly converting index values to 'int' when the
// ElementRegion is created.
unsigned char test_array_index_bitwidth(const unsigned char *p) {
unsigned short i = 0;
for (i = 0; i < 2; i++) p = &p[i];
return p[i+1];
}
// This case tests that CastRegion handles casts involving BlockPointerTypes.
// It should not crash.
void test_block_cast(void) {
id test_block_cast_aux(void);
(void (^)(void *))test_block_cast_aux(); // expected-warning{{expression result unused}}
}
int OSAtomicCompareAndSwap32Barrier();
// Test comparison of 'id' instance variable to a null void* constant after
// performing an OSAtomicCompareAndSwap32Barrier.
// This previously was a crash in RegionStoreManager.
@interface TestIdNull {
id x;
}
-(int)foo;
@end
@implementation TestIdNull
-(int)foo {
OSAtomicCompareAndSwap32Barrier(0, (signed)2, (signed*)&x);
if (x == (void*) 0) { return 0; }
return 1;
}
@end
// Do not crash when performing compare and swap on symbolic values.
typedef int int32_t;
typedef int int32;
typedef int32 Atomic32;
int OSAtomicCompareAndSwap32( int32_t __oldValue, int32_t __newValue, volatile int32_t *__theValue);
void radar11390991_NoBarrier_CompareAndSwap(volatile Atomic32 *ptr,
Atomic32 old_value,
Atomic32 new_value) {
OSAtomicCompareAndSwap32(old_value, new_value, ptr);
}
// PR 4594 - This was a crash when handling casts in SimpleSValuator.
void PR4594(void) {
char *buf[1];
char **foo = buf;
*foo = "test";
}
// Test invalidation logic where an integer is casted to an array with a
// different sign and then invalidated.
void test_invalidate_cast_int(void) {
void test_invalidate_cast_int_aux(unsigned *i);
signed i;
test_invalidate_cast_int_aux((unsigned*) &i);
if (i < 0)
return;
}
int ivar_getOffset();
// Reduced from a crash involving the cast of an Objective-C symbolic region to
// 'char *'
static NSNumber *test_ivar_offset(id self, SEL _cmd, Ivar inIvar) {
return [[[NSNumber allocWithZone:((void*)0)] initWithBool:*(_Bool *)((char *)self + ivar_getOffset(inIvar))] autorelease];
}
// Reduced from a crash in StoreManager::CastRegion involving a divide-by-zero.
// This resulted from not properly handling region casts to 'const void*'.
void test_cast_const_voidptr(void) {
char x[10];
char *p = &x[1];
const void* q = p;
}
// Reduced from a crash when analyzing Wine. This test handles loads from
// function addresses.
typedef long (*FARPROC)(void);
FARPROC test_load_func(FARPROC origfun) {
if (!*(unsigned char*) origfun)
return origfun;
return 0;
}
// Test passing-by-value an initialized struct variable.
struct test_pass_val {
int x;
int y;
};
void test_pass_val_aux(struct test_pass_val s);
void test_pass_val(void) {
struct test_pass_val s;
s.x = 1;
s.y = 2;
test_pass_val_aux(s);
}
// This is a reduced test case of a false positive that previously appeared
// in RegionStoreManager. Previously the array access resulted in dereferencing
// an undefined value.
int test_array_compound(int *q, int *r, int *z) {
int *array[] = { q, r, z };
int j = 0;
for (unsigned i = 0; i < 3 ; ++i)
if (*array[i]) ++j; // no-warning
return j;
}
// symbolic value stored in 'x' wouldn't be implicitly casted to a signed value
// during the comparison.
int rdar_7124210(unsigned int x) {
enum { SOME_CONSTANT = 123 };
int compare = ((signed) SOME_CONSTANT) == *((signed *) &x);
return compare ? 0 : 1; // Forces the evaluation of the symbolic constraint.
}
void pr4781(unsigned long *raw1) {
unsigned long *cook, *raw0;
unsigned long dough[32];
int i;
cook = dough;
for( i = 0; i < 16; i++, raw1++ ) {
raw0 = raw1++;
*cook = (*raw0 & 0x00fc0000L) << 6;
*cook |= (*raw0 & 0x00000fc0L) << 10;
}
}
// 'self' should be treated as being non-null upon entry to an objective-c
// method.
@interface RDar7185647
- (id)foo;
@end
@implementation RDar7185647
- (id) foo {
if (self)
return self;
*((volatile int *) 0x0) = 0xDEADBEEF; // no-warning
return self;
}
@end
// Test reasoning of __builtin_offsetof;
struct test_offsetof_A {
int x;
int y;
};
struct test_offsetof_B {
int w;
int z;
};
void test_offsetof_1(void) {
if (__builtin_offsetof(struct test_offsetof_A, x) ==
__builtin_offsetof(struct test_offsetof_B, w))
return;
int *p = 0;
*p = 0xDEADBEEF; // no-warning
}
void test_offsetof_2(void) {
if (__builtin_offsetof(struct test_offsetof_A, y) ==
__builtin_offsetof(struct test_offsetof_B, z))
return;
int *p = 0;
*p = 0xDEADBEEF; // no-warning
}
void test_offsetof_3(void) {
if (__builtin_offsetof(struct test_offsetof_A, y) -
__builtin_offsetof(struct test_offsetof_A, x)
==
__builtin_offsetof(struct test_offsetof_B, z) -
__builtin_offsetof(struct test_offsetof_B, w))
return;
int *p = 0;
*p = 0xDEADBEEF; // no-warning
}
void test_offsetof_4(void) {
if (__builtin_offsetof(struct test_offsetof_A, y) ==
__builtin_offsetof(struct test_offsetof_B, w))
return;
int *p = 0;
*p = 0xDEADBEEF; // expected-warning{{Dereference of null pointer}}
}
// "nil receiver" false positive: make tracking of the MemRegion for 'self'
// path-sensitive
@interface RDar6829164 : NSObject {
double x; int y;
}
- (id) init;
@end
id rdar_6829164_1(void);
double rdar_6829164_2(void);
@implementation RDar6829164
- (id) init {
if((self = [super init]) != 0) {
id z = rdar_6829164_1();
y = (z != 0);
if (y)
x = rdar_6829164_2();
}
return self;
}
@end
// Invalidate values passed-by-reference to functions when the pointer to the
// value is passed as an integer.
void test_7242015_aux(unsigned long);
int rdar_7242015(void) {
int x;
test_7242015_aux((unsigned long) &x); // no-warning
return x; // Previously we return and uninitialized value when
// using RegionStore.
}
// [RegionStore] compound literal assignment with floats not honored
CGFloat rdar7242006(CGFloat x) {
NSSize y = (NSSize){x, 10};
return y.width; // no-warning
}
// PR 4988 - This test exhibits a case where a function can be referenced
// when not explicitly used in an "lvalue" context (as far as the analyzer is
// concerned). This previously triggered a crash due to an invalid assertion.
void pr_4988(void) {
pr_4988; // expected-warning{{expression result unused}}
}
// A 'signed char' is used as a flag, which is implicitly converted to an int.
void *rdar7152418_bar(void);
@interface RDar7152418 {
signed char x;
}
-(char)foo;
@end;
@implementation RDar7152418
-(char)foo {
char *p = 0;
void *result = 0;
if (x) {
result = rdar7152418_bar();
p = "hello";
}
if (!result) {
result = rdar7152418_bar();
if (result && x)
return *p; // no-warning
}
return 1;
}
//===----------------------------------------------------------------------===//
// Test constant-folding of symbolic values, automatically handling type
// conversions of the symbol as necessary.
//===----------------------------------------------------------------------===//
// Previously this would crash once we started eagerly evaluating symbols whose
// values were constrained to a single value.
void test_symbol_fold_1(signed char x) {
while (1) {
if (x == ((signed char) 0)) {}
}
}
// This previously caused a crash because it triggered an assertion in APSInt.
void test_symbol_fold_2(unsigned int * p, unsigned int n,
const unsigned int * grumpkin, unsigned int dn) {
unsigned int i;
unsigned int tempsub[8];
unsigned int *solgrumpkin = tempsub + n;
for (i = 0; i < n; i++)
solgrumpkin[i] = (i < dn) ? ~grumpkin[i] : 0xFFFFFFFF;
for (i <<= 5; i < (n << 5); i++) {}
}
// This previously caused a crash because it triggered an assertion in APSInt.
// 'x' would evaluate to a 8-bit constant (because of the return value of
// test_symbol_fold_3_aux()) which would not get properly promoted to an
// integer.
char test_symbol_fold_3_aux(void);
unsigned test_symbol_fold_3(void) {
unsigned x = test_symbol_fold_3_aux();
if (x == 54)
return (x << 8) | 0x5;
return 0;
}
//===----------------------------------------------------------------------===//
// Tests for the warning of casting a non-struct type to a struct type
//===----------------------------------------------------------------------===//
typedef struct {unsigned int v;} NSSwappedFloat;
NSSwappedFloat test_cast_nonstruct_to_struct(float x) {
struct hodor {
float number;
NSSwappedFloat sf;
};
return ((struct hodor *)&x)->sf; // expected-warning{{Casting a non-structure type to a structure type and accessing a field can lead to memory access errors or data corruption}}
}
NSSwappedFloat test_cast_nonstruct_to_union(float x) {
union bran {
float number;
NSSwappedFloat sf;
};
return ((union bran *)&x)->sf; // no-warning
}
void test_undefined_array_subscript(void) {
int i, a[10];
int *p = &a[i]; // expected-warning{{Array subscript is undefined}}
}
@end
//===----------------------------------------------------------------------===//
// Test using an uninitialized value as a branch condition.
//===----------------------------------------------------------------------===//
int test_uninit_branch(void) {
int x;
if (x) // expected-warning{{Branch condition evaluates to a garbage value}}
return 1;
return 0;
}
int test_uninit_branch_b(void) {
int x;
return x ? 1 : 0; // expected-warning{{Branch condition evaluates to a garbage value}}
}
int test_uninit_branch_c(void) {
int x;
if ((short)x) // expected-warning{{Branch condition evaluates to a garbage value}}
return 1;
return 0;
}
//===----------------------------------------------------------------------===//
// Test passing an undefined value in a message or function call.
//===----------------------------------------------------------------------===//
void test_bad_call_aux(int x);
void test_bad_call(void) {
int y;
test_bad_call_aux(y); // expected-warning{{1st function call argument is an uninitialized value}}
}
@interface TestBadArg {}
- (void) testBadArg:(int) x;
@end
void test_bad_msg(TestBadArg *p) {
int y;
[p testBadArg:y]; // expected-warning{{1st argument in message expression is an uninitialized value}}
}
//===----------------------------------------------------------------------===//
// PR 6033 - Test emitting the correct output in a warning where we use '%'
// with operands that are undefined.
//===----------------------------------------------------------------------===//
int pr6033(int x) {
int y;
return x % y; // expected-warning{{The right operand of '%' is a garbage value}}
}
struct trie {
struct trie* next;
};
struct kwset {
struct trie *trie;
unsigned char y[10];
struct trie* next[10];
int d;
};
typedef struct trie trie_t;
typedef struct kwset kwset_t;
void f(kwset_t *kws, char const *p, char const *q) {
struct trie const *trie;
struct trie * const *next = kws->next;
register unsigned char c;
register char const *end = p;
register char const *lim = q;
register int d = 1;
register unsigned char const *y = kws->y;
d = y[c = (end+=d)[-1]]; // no-warning
trie = next[c];
}
//===----------------------------------------------------------------------===//
// When handling sizeof(VLA) it leads to a hole in the ExplodedGraph (causing a
// false positive).
//===----------------------------------------------------------------------===//
int rdar_7593875_aux(int x);
int rdar_7593875(int n) {
int z[n > 10 ? 10 : n]; // VLA.
int v;
v = rdar_7593875_aux(sizeof(z));
// Previously we got a false positive about 'v' being uninitialized.
return v; // no-warning
}
//===----------------------------------------------------------------------===//
// Handle casts from symbolic regions (packaged as integers) to doubles.
// Previously this caused an assertion failure.
//===----------------------------------------------------------------------===//
void *foo_rev95119(void);
void baz_rev95119(double x);
void bar_rev95119(void) {
// foo_rev95119() returns a symbolic pointer. It is then
// cast to an int which is then cast to a double.
int value = (int) foo_rev95119();
baz_rev95119((double)value);
}
//===----------------------------------------------------------------------===//
// Handle loading a symbolic pointer from a symbolic region that was
// invalidated by a call to an unknown function.
//===----------------------------------------------------------------------===//
void bar_rev95192(int **x);
void foo_rev95192(int **x) {
*x = 0;
bar_rev95192(x);
// Not a null dereference.
**x = 1; // no-warning
}
//===----------------------------------------------------------------------===//
// Handle casts of a function to a function pointer with a different return
// value. We don't yet emit an error for such cases, but we now we at least
// don't crash when the return value gets interpreted in a way that
// violates our invariants.
//===----------------------------------------------------------------------===//
void *foo_rev95267(void);
int bar_rev95267(void) {
char (*Callback_rev95267)(void) = (char (*)(void)) foo_rev95267;
if ((*Callback_rev95267)() == (char) 0)
return 1;
return 0;
}
// Same as previous case, but handle casts to 'void'.
int bar_rev95274(void) {
void (*Callback_rev95274)(void) = (void (*)(void)) foo_rev95267;
(*Callback_rev95274)();
return 0;
}
void rdar7582031_test_static_init_zero(void) {
static unsigned x;
if (x == 0)
return;
int *p = 0;
*p = 0xDEADBEEF;
}
void rdar7582031_test_static_init_zero_b(void) {
static void* x;
if (x == 0)
return;
int *p = 0;
*p = 0xDEADBEEF;
}
//===----------------------------------------------------------------------===//
// Test handling of parameters that are structs that contain floats and //
// nested fields. //
//===----------------------------------------------------------------------===//
struct s_rev95547_nested { float x, y; };
struct s_rev95547 {
struct s_rev95547_nested z1;
struct s_rev95547_nested z2;
};
float foo_rev95547(struct s_rev95547 w) {
return w.z1.x + 20.0; // no-warning
}
void foo_rev95547_b(struct s_rev95547 w) {
struct s_rev95547 w2 = w;
w2.z1.x += 20.0; // no-warning
}
//===----------------------------------------------------------------------===//
// Test handling statement expressions that don't populate a CFG block that
// is used to represent the computation of the RHS of a logical operator.
// This previously triggered a crash.
//===----------------------------------------------------------------------===//
void pr6938(void) {
if (1 && ({
while (0);
0;
}) == 0) {
}
}
void pr6938_b(void) {
if (1 && *({ // expected-warning{{Dereference of null pointer}}
while (0) {}
({
(int *) 0;
});
}) == 0) {
}
}
//===----------------------------------------------------------------------===//
// The CFG for code containing an empty @synchronized block was previously
// broken (and would crash the analyzer).
//===----------------------------------------------------------------------===//
void r7979430(id x) {
@synchronized(x) {}
}
//===----------------------------------------------------------------------===
// PR 7361 - Test that functions wrapped in macro instantiations are analyzed.
//===----------------------------------------------------------------------===
#define MAKE_TEST_FN() \
void test_pr7361 (char a) {\
char* b = 0x0; *b = a;\
}
MAKE_TEST_FN() // expected-warning{{null pointer}}
//===----------------------------------------------------------------------===
// PR 7491 - Test that symbolic expressions can be used as conditions.
//===----------------------------------------------------------------------===
void pr7491 (void) {
extern int getint(void);
int a = getint()-1;
if (a) {
return;
}
if (!a) {
return;
} else {
// Should be unreachable
(void)*(char*)0; // no-warning
}
}
//===----------------------------------------------------------------------===
// PR 7475 - Test that assumptions about global variables are reset after
// calling a global function.
//===----------------------------------------------------------------------===
int *pr7475_someGlobal;
void pr7475_setUpGlobal(void);
void pr7475(void) {
if (pr7475_someGlobal == 0)
pr7475_setUpGlobal();
*pr7475_someGlobal = 0; // no-warning
}
void pr7475_warn(void) {
static int *someStatic = 0;
if (someStatic == 0)
pr7475_setUpGlobal();
*someStatic = 0; // expected-warning{{null pointer}}
}
// __imag passed non-complex should not crash
float f0(_Complex float x) {
float l0 = __real x;
return __real l0 + __imag l0;
}
//===----------------------------------------------------------------------===
// Test that we can reduce symbols to constants whether they are on the left
// or right side of an expression.
//===----------------------------------------------------------------------===
void reduce_to_constant(int x, int y) {
if (x != 20)
return;
int a = x + y;
int b = y + x;
if (y == -20 && a != 0)
(void)*(char*)0; // no-warning
if (y == -20 && b != 0)
(void)*(char*)0; // no-warning
}
// Test that code after a switch statement with no 'case:' labels is correctly
// evaluated.
void r8360854(int n) {
switch (n) {
default: ;
}
int *p = 0;
*p = 0xDEADBEEF; // expected-warning{{null pointer}}
}
// PR 8050 - crash in CastSizeChecker when pointee is an incomplete type
typedef long unsigned int __darwin_size_t;
typedef __darwin_size_t size_t;
void *malloc(size_t);
struct PR8050;
void pr8050(struct PR8050 **arg)
{
*arg = malloc(1);
}
// Switch on enum should not consider default case live if all enum values are
// covered.
enum Cases { C1, C2, C3, C4 };
void test_enum_cases(enum Cases C) {
switch (C) {
case C1:
case C2:
case C4:
case C3:
return;
}
int *p = 0;
*p = 0xDEADBEEF; // no-warning
}
void test_enum_cases_positive(enum Cases C) {
switch (C) { // expected-warning{{enumeration value 'C4' not handled in switch}}
case C1:
case C2:
case C3:
return;
}
int *p = 0;
*p = 0xDEADBEEF; // expected-warning{{Dereference of null pointer}}
}
// Warn if synchronization mutex can be nil
void rdar6351970(void) {
id x = 0;
@synchronized(x) {} // expected-warning{{Nil value used as mutex for @synchronized() (no synchronization will occur)}}
}
void rdar6351970_b(id x) {
if (!x)
@synchronized(x) {} // expected-warning{{Nil value used as mutex for @synchronized() (no synchronization will occur)}}
}
void rdar6351970_c(void) {
id x;
@synchronized(x) {} // expected-warning{{Uninitialized value used as mutex for @synchronized}}
}
@interface Rdar8578650
- (id) foo8578650;
@end
void rdar8578650(id x) {
@synchronized (x) {
[x foo8578650];
}
// At this point we should assume that 'x' is not nil, not
// the inverse.
@synchronized (x) { // no-warning
}
}
// Direct structure member access null pointer dereference
@interface RDar6352035 {
int c;
}
- (void)foo;
- (void)bar;
@end
@implementation RDar6352035
- (void)foo {
RDar6352035 *friend = 0;
friend->c = 7; // expected-warning{{Access to instance variable 'c' results in a dereference of a null pointer (loaded from variable 'friend')}}
}
- (void)bar {
self = 0;
c = 7; // expected-warning{{Access to instance variable 'c' results in a dereference of a null pointer (loaded from variable 'self')}}
}
@end
// PR 8149 - GNU statement expression in condition of ForStmt.
// This previously triggered an assertion failure in CFGBuilder.
void pr8149(void) {
for (; ({ do { } while (0); 0; });) { }
}
// PR 8458 - Make sure @synchronized doesn't crash with properties.
@interface PR8458 {}
@property(readonly) id lock;
@end
static
void __PR8458(PR8458 *x) {
@synchronized(x.lock) {} // no-warning
}
// PR 8440 - False null dereference during store to array-in-field-in-global.
// This test case previously resulted in a bogus null deref warning from
// incorrect lazy symbolication logic in RegionStore.
static struct {
int num;
char **data;
} saved_pr8440;
char *foo_pr8440(void);
char **bar_pr8440(void);
void baz_pr8440(int n)
{
saved_pr8440.num = n;
if (saved_pr8440.data)
return;
saved_pr8440.data = bar_pr8440();
for (int i = 0 ; i < n ; i ++)
saved_pr8440.data[i] = foo_pr8440(); // no-warning
}
// Support direct accesses to non-null memory. Reported in:
// PR 5272
int test_direct_address_load(void) {
int *p = (int*) 0x4000;
return *p; // no-warning
}
void pr5272_test(void) {
struct pr5272 { int var2; };
(*(struct pr5272*)0xBC000000).var2 = 0; // no-warning
(*(struct pr5272*)0xBC000000).var2 += 2; // no-warning
}
// Support casting the return value of function to another different type
// This previously caused a crash, although we likely need more precise
// reasoning here.
void* rdar8663544(void);
typedef struct {} Val8663544;
Val8663544 bazR8663544(void) {
Val8663544(*func) (void) = (Val8663544(*) (void)) rdar8663544;
return func();
}
// PR 8619 - Handle ternary expressions with a call to a noreturn function.
// This previously resulted in a crash.
void pr8619_noreturn(int x) __attribute__((noreturn));
void pr8619(int a, int b, int c) {
a ?: pr8619_noreturn(b || c);
}
// PR 8646 - crash in the analyzer when handling unions.
union pr8648_union {
signed long long pr8648_union_field;
};
void pr8648(void) {
long long y;
union pr8648_union x = { .pr8648_union_field = 0LL };
y = x.pr8648_union_field;
union pr8648_union z;
z = (union pr8648_union) { .pr8648_union_field = 0LL };
union pr8648_union w;
w = ({ (union pr8648_union) { .pr8648_union_field = 0LL }; });
// crash, no assignment
(void) ({ (union pr8648_union) { .pr8648_union_field = 0LL }; }).pr8648_union_field;
// crash with assignment
y = ({ (union pr8648_union) { .pr8648_union_field = 0LL }; }).pr8648_union_field;
}
// PR 9269 - don't assert when building the following CFG. The for statement
// contains a condition with multiple basic blocks, and the value of the
// statement expression is then indexed as part of a bigger condition expression.
// This example exposed a bug in child traversal in the CFGBuilder.
void pr9269(void) {
struct s { char *bar[10]; } baz[2] = { 0 };
unsigned i = 0;
for (i = 0;
(* ({ while(0); ({ &baz[0]; }); })).bar[0] != 0; // expected-warning {{while loop has empty body}} expected-note {{put the semicolon on a separate line to silence this warning}}
++i) {}
}
// Test evaluation of GNU-style ?:.
int pr9287(int type) { return type ? : 0; } // no-warning
void pr9287_b(int type, int *p) {
int x = type ? : 0;
if (x) {
p = 0;
}
if (type) {
*p = 0xDEADBEEF; // expected-warning {{null pointer}}
}
}
void pr9287_c(int type, int *p) {
int x = type ? : 0;
if (x) {
p = 0;
}
if (!type) {
*p = 0xDEADBEEF; // no-warning
}
}
void test_switch(void) {
switch (4) {
case 1: {
int *p = 0;
*p = 0xDEADBEEF; // no-warning
break;
}
case 4: {
int *p = 0;
*p = 0xDEADBEEF; // expected-warning {{null}}
break;
}
default: {
int *p = 0;
*p = 0xDEADBEEF; // no-warning
break;
}
}
}
// PR 9467. Tests various CFG optimizations. This previously crashed.
static void test(unsigned int bit_mask)
{
unsigned int bit_index;
for (bit_index = 0;
bit_index < 24;
bit_index++) {
switch ((0x01 << bit_index) & bit_mask) {
case 0x100000: ;
}
}
}
// Don't crash on code containing __label__.
int radar9414427_aux(void);
void radar9414427(void) {
__label__ mylabel;
if (radar9414427_aux()) {
mylabel: do {}
while (0);
}
}
// Analyze methods in @implementation (category)
@interface RDar9465344
@end
@implementation RDar9465344 (MyCategory)
- (void) testcategoryImpl {
int *p = 0x0;
*p = 0xDEADBEEF; // expected-warning {{null}}
}
@end
@implementation RDar9465344
@end
// Don't crash when analyzing access to 'self' within a block.
@interface Rdar10380300Base
- (void) foo;
@end
@interface Rdar10380300 : Rdar10380300Base @end
@implementation Rdar10380300
- (void)foo {
^{
[super foo];
}();
}
@end
// Don't crash when a ?: is only preceded by a statement (not an expression)
// in the CFG.
void __assert_fail(void);
enum rdar1196620_e { E_A, E_B, E_C, E_D };
struct rdar1196620_s { int ints[E_D+1]; };
static void rdar1196620_call_assert(struct rdar1196620_s* s) {
int i = 0;
s?(void)0:__assert_fail();
}
static void rdar1196620(struct rdar1196620_s* s) {
rdar1196620_call_assert(s);
}
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