temp change to use objc_weak calls. use squash before submitting

Author: dmaclach

Source/OCMock/NSInvocation+OCMAdditions.m

@@ -20,7 +20,7 @@
 #import "NSInvocation+OCMAdditions.h"
 #import "OCMFunctionsPrivate.h"
 #import "NSMethodSignature+OCMAdditions.h"
-#import "NSObject+OCMAdditions.h"
+
 
 #if (TARGET_OS_OSX && (!defined(__MAC_10_10) || __MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_10)) || \
     (TARGET_OS_IPHONE && (!defined(__IPHONE_8_0) || __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_8_0))
@@ -30,6 +30,7 @@ static BOOL OCMObjectIsClass(id object) {
 #define object_isClass OCMObjectIsClass
 #endif
 
+
 @implementation NSInvocation(OCMAdditions)
 
 + (NSInvocation *)invocationForBlock:(id)block withArguments:(NSArray *)arguments
@@ -65,7 +66,7 @@ - (void)retainObjectArgumentsExcludingObject:(id)objectToExclude
     NSMutableArray *retainedArguments = [[NSMutableArray alloc] init];
 
     id target = [self target];
-    if((target != nil) && (target != objectToExclude) && !object_isClass(target) && ![target _isDeallocating])
+    if((target != nil) && (target != objectToExclude) && !object_isClass(target) && !OCMIsDeallocating(target))
     {
         // Bad things will happen if the target is a block since it's not being
         // copied. There isn't a very good way to tell if an invocation's target
@@ -83,7 +84,7 @@ - (void)retainObjectArgumentsExcludingObject:(id)objectToExclude
         {
             id argument;
             [self getArgument:&argument atIndex:index];
-            if((argument != nil) && (argument != objectToExclude) && ![argument _isDeallocating])
+            if((argument != nil) && (argument != objectToExclude) && !OCMIsDeallocating(argument))
             {
                 if(OCMIsBlockType(argumentType))
                 {
@@ -105,7 +106,7 @@ - (void)retainObjectArgumentsExcludingObject:(id)objectToExclude
     {
         id returnValue;
         [self getReturnValue:&returnValue];
-        if((returnValue != nil) && (returnValue != objectToExclude) && ![returnValue _isDeallocating])
+        if((returnValue != nil) && (returnValue != objectToExclude) && !OCMIsDeallocating(returnValue))
         {
             if(OCMIsBlockType(returnType))
             {

Source/OCMock/NSObject+OCMAdditions.h

@@ -22,9 +22,3 @@
 + (void)enumerateMethodsInClass:(Class)aClass usingBlock:(void (^)(Class cls, SEL sel))aBlock;
 
 @end
-
-
-@interface  NSObject (Internals)
-// Return YES if an object is in the process of being deallocated.
-- (BOOL)_isDeallocating;
-@end

Source/OCMock/OCMFunctions.m

@@ -32,6 +32,10 @@ - (void)recordFailureWithDescription:(NSString *)description inFile:(NSString *)
 - (void)failWithException:(NSException *)exception;
 @end
 
+// From objc/runtime/objc-internal.h
+// Only available on macOS 10.11/iOS 9.
+extern id objc_initWeakOrNil(id *location, id newObj) __attribute__((weak_import));
+extern void objc_destroyWeak(id _Nullable * _Nonnull location) __attribute__((weak_import));
 
 #pragma mark  Functions related to ObjC type system
 
@@ -406,3 +410,20 @@ void OCMReportFailure(OCMLocation *loc, NSString *description)
     }
 
 }
+
+BOOL OCMIsDeallocating(id anObject)
+{
+    if (!objc_initWeakOrNil)
+    {
+        // Pre iOS9/macOS10.11 we just assume all is well since we can't check.
+        return NO;
+    }
+    id deallocatingObject = nil;
+    BOOL isDeallocating = objc_initWeakOrNil(&deallocatingObject, anObject) == nil;
+    if (deallocatingObject)
+    {
+        objc_destroyWeak(&deallocatingObject);
+    }
+    return isDeallocating;
+}
+

Source/OCMock/OCMFunctionsPrivate.h

@@ -40,3 +40,5 @@ void OCMSetAssociatedMockForObject(OCClassMockObject *mock, id anObject);
 OCPartialMockObject *OCMGetAssociatedMockForObject(id anObject);
 
 void OCMReportFailure(OCMLocation *loc, NSString *description);
+
+BOOL OCMIsDeallocating(id anObject);

Source/OCMock/OCMStubRecorder.m

@@ -25,7 +25,7 @@
 #import "OCMRealObjectForwarder.h"
 #import "OCMFunctions.h"
 #import "OCMInvocationStub.h"
-#import "NSObject+OCMAdditions.h"
+#import "OCMFunctionsPrivate.h"
 
 
 @implementation OCMStubRecorder
@@ -53,7 +53,7 @@ - (OCMInvocationStub *)stub
 - (id)andReturn:(id)anObject
 {
     id action;
-    if(anObject == mockObject || [anObject _isDeallocating])
+    if(anObject == mockObject || OCMIsDeallocating(anObject))
     {
         action = [[[OCMNonRetainingObjectReturnValueProvider alloc] initWithValue:anObject] autorelease];
     }

Source/OCMockTests/OCMockObjectPartialMocksTests.m

@@ -608,4 +608,5 @@ - (void)testMethodSwizzlingWorksForVoidReturns
 	XCTAssertNoThrow([foo method1], @"Should have worked.");
 }
 
+
 @end