forked from OSchip/llvm-project
73 lines
2.5 KiB
C
73 lines
2.5 KiB
C
// RUN: %clang_analyze_cc1 -analyzer-checker=core,osx.coreFoundation.CFRetainRelease,osx.cocoa.RetainCount -verify %s
|
|
|
|
#pragma clang arc_cf_code_audited begin
|
|
typedef const void * CFTypeRef;
|
|
extern CFTypeRef CFRetain(CFTypeRef cf);
|
|
extern void CFRelease(CFTypeRef cf);
|
|
#pragma clang arc_cf_code_audited end
|
|
|
|
#define CF_RETURNS_RETAINED __attribute__((cf_returns_retained))
|
|
#define CF_CONSUMED __attribute__((cf_consumed))
|
|
|
|
extern CFTypeRef CFCreate() CF_RETURNS_RETAINED;
|
|
|
|
// A "safe" variant of CFRetain that doesn't crash when a null pointer is
|
|
// retained. This is often defined by users in a similar manner. The
|
|
// CF_RETURNS_RETAINED annotation is misleading here, because the function
|
|
// is not supposed to return an object with a +1 retain count. Instead, it
|
|
// is supposed to return an object with +(N+1) retain count, where N is
|
|
// the original retain count of 'cf'. However, there is no good annotation
|
|
// to use in this case, and it is pointless to provide such annotation
|
|
// because the only use cases would be CFRetain and SafeCFRetain.
|
|
// So instead we teach the analyzer to be able to accept such code
|
|
// and ignore the misplaced annotation.
|
|
CFTypeRef SafeCFRetain(CFTypeRef cf) CF_RETURNS_RETAINED {
|
|
if (cf) {
|
|
return CFRetain(cf);
|
|
}
|
|
return cf;
|
|
}
|
|
|
|
// A "safe" variant of CFRelease that doesn't crash when a null pointer is
|
|
// released. The CF_CONSUMED annotation seems reasonable here.
|
|
void SafeCFRelease(CFTypeRef CF_CONSUMED cf) {
|
|
if (cf)
|
|
CFRelease(cf); // no-warning (when inlined)
|
|
}
|
|
|
|
void escape(CFTypeRef cf);
|
|
|
|
void makeSureTestsWork() {
|
|
CFTypeRef cf = CFCreate();
|
|
CFRelease(cf);
|
|
CFRelease(cf); // expected-warning{{Reference-counted object is used after it is released}}
|
|
}
|
|
|
|
// Make sure we understand that the second SafeCFRetain doesn't return an
|
|
// object with +1 retain count, which we won't be able to release twice.
|
|
void falseOverrelease(CFTypeRef cf) {
|
|
SafeCFRetain(cf);
|
|
SafeCFRetain(cf);
|
|
SafeCFRelease(cf);
|
|
SafeCFRelease(cf); // no-warning after inlining this.
|
|
}
|
|
|
|
// Regular CFRelease() should behave similarly.
|
|
void sameWithNormalRelease(CFTypeRef cf) {
|
|
SafeCFRetain(cf);
|
|
SafeCFRetain(cf);
|
|
CFRelease(cf);
|
|
CFRelease(cf); // no-warning
|
|
}
|
|
|
|
// Make sure we understand that the second SafeCFRetain doesn't return an
|
|
// object with +1 retain count, which would no longer be owned by us after
|
|
// it escapes to escape() and released once.
|
|
void falseReleaseNotOwned(CFTypeRef cf) {
|
|
SafeCFRetain(cf);
|
|
SafeCFRetain(cf);
|
|
escape(cf);
|
|
SafeCFRelease(cf);
|
|
SafeCFRelease(cf); // no-warning after inlining this.
|
|
}
|