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//
// GTMDefines.h
//
// Copyright 2008 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
//
// ============================================================================
#include <AvailabilityMacros.h>
#include <TargetConditionals.h>
#ifdef __OBJC__
#include <Foundation/NSObjCRuntime.h>
#endif // __OBJC__
#if TARGET_OS_IPHONE
#include <Availability.h>
#endif // TARGET_OS_IPHONE
// ----------------------------------------------------------------------------
// CPP symbols that can be overridden in a prefix to control how the toolbox
// is compiled.
// ----------------------------------------------------------------------------
// By setting the GTM_CONTAINERS_VALIDATION_FAILED_LOG and
// GTM_CONTAINERS_VALIDATION_FAILED_ASSERT macros you can control what happens
// when a validation fails. If you implement your own validators, you may want
// to control their internals using the same macros for consistency.
#ifndef GTM_CONTAINERS_VALIDATION_FAILED_ASSERT
#define GTM_CONTAINERS_VALIDATION_FAILED_ASSERT 0
#endif
// Ensure __has_feature and __has_extension are safe to use.
// See http://clang-analyzer.llvm.org/annotations.html
#ifndef __has_feature // Optional.
#define __has_feature(x) 0 // Compatibility with non-clang compilers.
#endif
#ifndef __has_extension
#define __has_extension __has_feature // Compatibility with pre-3.0 compilers.
#endif
// Give ourselves a consistent way to do inlines. Apple's macros even use
// a few different actual definitions, so we're based off of the foundation
// one.
#if !defined(GTM_INLINE)
#if (defined (__GNUC__) && (__GNUC__ == 4)) || defined (__clang__)
#define GTM_INLINE static __inline__ __attribute__((always_inline))
#else
#define GTM_INLINE static __inline__
#endif
#endif
// Give ourselves a consistent way of doing externs that links up nicely
// when mixing objc and objc++
#if !defined (GTM_EXTERN)
#if defined __cplusplus
#define GTM_EXTERN extern "C"
#define GTM_EXTERN_C_BEGIN extern "C" {
#define GTM_EXTERN_C_END }
#else
#define GTM_EXTERN extern
#define GTM_EXTERN_C_BEGIN
#define GTM_EXTERN_C_END
#endif
#endif
// Give ourselves a consistent way of exporting things if we have visibility
// set to hidden.
#if !defined (GTM_EXPORT)
#define GTM_EXPORT __attribute__((visibility("default")))
#endif
// Give ourselves a consistent way of declaring something as unused. This
// doesn't use __unused because that is only supported in gcc 4.2 and greater.
#if !defined (GTM_UNUSED)
#define GTM_UNUSED(x) ((void)(x))
#endif
// _GTMDevLog & _GTMDevAssert
//
// _GTMDevLog & _GTMDevAssert are meant to be a very lightweight shell for
// developer level errors. This implementation simply macros to NSLog/NSAssert.
// It is not intended to be a general logging/reporting system.
//
// Please see http://code.google.com/p/google-toolbox-for-mac/wiki/DevLogNAssert
// for a little more background on the usage of these macros.
//
// _GTMDevLog log some error/problem in debug builds
// _GTMDevAssert assert if condition isn't met w/in a method/function
// in all builds.
//
// To replace this system, just provide different macro definitions in your
// prefix header. Remember, any implementation you provide *must* be thread
// safe since this could be called by anything in what ever situtation it has
// been placed in.
//
// Ignore the "Macro name is a reserved identifier" warning in this section
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wreserved-id-macro"
// We only define the simple macros if nothing else has defined this.
#ifndef _GTMDevLog
#ifdef DEBUG
#define _GTMDevLog(...) NSLog(__VA_ARGS__)
#else
#define _GTMDevLog(...) do { } while (0)
#endif
#endif // _GTMDevLog
#ifndef _GTMDevAssert
// we directly invoke the NSAssert handler so we can pass on the varargs
// (NSAssert doesn't have a macro we can use that takes varargs)
#if !defined(NS_BLOCK_ASSERTIONS)
#define _GTMDevAssert(condition, ...) \
do { \ if (!(condition)) { \ [[NSAssertionHandler currentHandler] \ handleFailureInFunction:(NSString *) \ [NSString stringWithUTF8String:__PRETTY_FUNCTION__] \ file:(NSString *)[NSString stringWithUTF8String:__FILE__] \ lineNumber:__LINE__ \ description:__VA_ARGS__]; \ } \ } while(0)#else // !defined(NS_BLOCK_ASSERTIONS)
#define _GTMDevAssert(condition, ...) do { } while (0)
#endif // !defined(NS_BLOCK_ASSERTIONS)
#endif // _GTMDevAssert
// _GTMCompileAssert
//
// Note: Software for current compilers should just use _Static_assert directly
// instead of this macro.
//
// _GTMCompileAssert is an assert that is meant to fire at compile time if you
// want to check things at compile instead of runtime. For example if you
// want to check that a wchar is 4 bytes instead of 2 you would use
// _GTMCompileAssert(sizeof(wchar_t) == 4, wchar_t_is_4_bytes_on_OS_X)
// Note that the second "arg" is not in quotes, and must be a valid processor
// symbol in it's own right (no spaces, punctuation etc).
// Wrapping this in an #ifndef allows external groups to define their own
// compile time assert scheme.
#ifndef _GTMCompileAssert
#if __has_feature(c_static_assert) || __has_extension(c_static_assert)
#define _GTMCompileAssert(test, msg) _Static_assert((test), #msg)
#else
// Pre-Xcode 7 support.
//
// We got this technique from here:
// http://unixjunkie.blogspot.com/2007/10/better-compile-time-asserts_29.html
#define _GTMCompileAssertSymbolInner(line, msg) _GTMCOMPILEASSERT ## line ## __ ## msg
#define _GTMCompileAssertSymbol(line, msg) _GTMCompileAssertSymbolInner(line, msg)
#define _GTMCompileAssert(test, msg) \
typedef char _GTMCompileAssertSymbol(__LINE__, msg) [ ((test) ? 1 : -1) ] #endif // __has_feature(c_static_assert) || __has_extension(c_static_assert)
#endif // _GTMCompileAssert
#pragma clang diagnostic pop
// ----------------------------------------------------------------------------
// CPP symbols defined based on the project settings so the GTM code has
// simple things to test against w/o scattering the knowledge of project
// setting through all the code.
// ----------------------------------------------------------------------------
// Provide a single constant CPP symbol that all of GTM uses for ifdefing
// iPhone code.
#if TARGET_OS_IPHONE // iPhone SDK
// For iPhone specific stuff
#define GTM_IPHONE_SDK 1
#if TARGET_IPHONE_SIMULATOR
#define GTM_IPHONE_DEVICE 0
#define GTM_IPHONE_SIMULATOR 1
#else
#define GTM_IPHONE_DEVICE 1
#define GTM_IPHONE_SIMULATOR 0
#endif // TARGET_IPHONE_SIMULATOR
// By default, GTM has provided it's own unittesting support, define this
// to use the support provided by Xcode, especially for the Xcode4 support
// for unittesting.
#ifndef GTM_USING_XCTEST
#define GTM_USING_XCTEST 0
#endif
#define GTM_MACOS_SDK 0
#else
// For MacOS specific stuff
#define GTM_MACOS_SDK 1
#define GTM_IPHONE_SDK 0
#define GTM_IPHONE_SIMULATOR 0
#define GTM_IPHONE_DEVICE 0
#ifndef GTM_USING_XCTEST
#define GTM_USING_XCTEST 0
#endif
#endif
// Some of our own availability macros
#if GTM_MACOS_SDK
#define GTM_AVAILABLE_ONLY_ON_IPHONE UNAVAILABLE_ATTRIBUTE
#define GTM_AVAILABLE_ONLY_ON_MACOS
#else
#define GTM_AVAILABLE_ONLY_ON_IPHONE
#define GTM_AVAILABLE_ONLY_ON_MACOS UNAVAILABLE_ATTRIBUTE
#endif
// GC was dropped by Apple, define the old constant incase anyone still keys
// off of it.
#ifndef GTM_SUPPORT_GC
#define GTM_SUPPORT_GC 0
#endif
// Some support for advanced clang static analysis functionality
#ifndef NS_RETURNS_RETAINED
#if __has_feature(attribute_ns_returns_retained)
#define NS_RETURNS_RETAINED __attribute__((ns_returns_retained))
#else
#define NS_RETURNS_RETAINED
#endif
#endif
#ifndef NS_RETURNS_NOT_RETAINED
#if __has_feature(attribute_ns_returns_not_retained)
#define NS_RETURNS_NOT_RETAINED __attribute__((ns_returns_not_retained))
#else
#define NS_RETURNS_NOT_RETAINED
#endif
#endif
#ifndef CF_RETURNS_RETAINED
#if __has_feature(attribute_cf_returns_retained)
#define CF_RETURNS_RETAINED __attribute__((cf_returns_retained))
#else
#define CF_RETURNS_RETAINED
#endif
#endif
#ifndef CF_RETURNS_NOT_RETAINED
#if __has_feature(attribute_cf_returns_not_retained)
#define CF_RETURNS_NOT_RETAINED __attribute__((cf_returns_not_retained))
#else
#define CF_RETURNS_NOT_RETAINED
#endif
#endif
#ifndef NS_CONSUMED
#if __has_feature(attribute_ns_consumed)
#define NS_CONSUMED __attribute__((ns_consumed))
#else
#define NS_CONSUMED
#endif
#endif
#ifndef CF_CONSUMED
#if __has_feature(attribute_cf_consumed)
#define CF_CONSUMED __attribute__((cf_consumed))
#else
#define CF_CONSUMED
#endif
#endif
#ifndef NS_CONSUMES_SELF
#if __has_feature(attribute_ns_consumes_self)
#define NS_CONSUMES_SELF __attribute__((ns_consumes_self))
#else
#define NS_CONSUMES_SELF
#endif
#endif
#ifndef GTM_NONNULL
#if defined(__has_attribute)
#if __has_attribute(nonnull)
#define GTM_NONNULL(x) __attribute__((nonnull x))
#else
#define GTM_NONNULL(x)
#endif
#else
#define GTM_NONNULL(x)
#endif
#endif
// Invalidates the initializer from which it's called.
#ifndef GTMInvalidateInitializer
#if __has_feature(objc_arc)
#define GTMInvalidateInitializer() \
do { \ [self class]; /* Avoid warning of dead store to |self|. */ \ _GTMDevAssert(NO, @"Invalid initializer."); \ return nil; \ } while (0) #else
#define GTMInvalidateInitializer() \
do { \ [self release]; \ _GTMDevAssert(NO, @"Invalid initializer."); \ return nil; \ } while (0) #endif
#endif
#ifndef GTMCFAutorelease
// GTMCFAutorelease returns an id. In contrast, Apple's CFAutorelease returns
// a CFTypeRef.
#if __has_feature(objc_arc)
#define GTMCFAutorelease(x) CFBridgingRelease(x)
#else
#define GTMCFAutorelease(x) ([(id)x autorelease])
#endif
#endif
#ifdef __OBJC__
// Macro to allow you to create NSStrings out of other macros.
// #define FOO foo
// NSString *fooString = GTM_NSSTRINGIFY(FOO);
#if !defined (GTM_NSSTRINGIFY)
#define GTM_NSSTRINGIFY_INNER(x) @#x
#define GTM_NSSTRINGIFY(x) GTM_NSSTRINGIFY_INNER(x)
#endif
// Macro to allow fast enumeration when building for 10.5 or later, and
// reliance on NSEnumerator for 10.4. Remember, NSDictionary w/ FastEnumeration
// does keys, so pick the right thing, nothing is done on the FastEnumeration
// side to be sure you're getting what you wanted.
#ifndef GTM_FOREACH_OBJECT
#if TARGET_OS_IPHONE || !(MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_5)
#define GTM_FOREACH_ENUMEREE(element, enumeration) \
for (element in enumeration) #define GTM_FOREACH_OBJECT(element, collection) \
for (element in collection) #define GTM_FOREACH_KEY(element, collection) \
for (element in collection) #else
#define GTM_FOREACH_ENUMEREE(element, enumeration) \
for (NSEnumerator *_ ## element ## _enum = enumeration; \ (element = [_ ## element ## _enum nextObject]) != nil; ) #define GTM_FOREACH_OBJECT(element, collection) \
GTM_FOREACH_ENUMEREE(element, [collection objectEnumerator]) #define GTM_FOREACH_KEY(element, collection) \
GTM_FOREACH_ENUMEREE(element, [collection keyEnumerator]) #endif
#endif
// ============================================================================
// GTM_SEL_STRING is for specifying selector (usually property) names to KVC
// or KVO methods.
// In debug it will generate warnings for undeclared selectors if
// -Wunknown-selector is turned on.
// In release it will have no runtime overhead.
#ifndef GTM_SEL_STRING
#ifdef DEBUG
#define GTM_SEL_STRING(selName) NSStringFromSelector(@selector(selName))
#else
#define GTM_SEL_STRING(selName) @#selName
#endif // DEBUG
#endif // GTM_SEL_STRING
#ifndef GTM_WEAK
#if __has_feature(objc_arc_weak)
// With ARC enabled, __weak means a reference that isn't implicitly
// retained. __weak objects are accessed through runtime functions, so
// they are zeroed out, but this requires OS X 10.7+.
// At clang r251041+, ARC-style zeroing weak references even work in
// non-ARC mode.
#define GTM_WEAK __weak
#elif __has_feature(objc_arc)
// ARC, but targeting 10.6 or older, where zeroing weak references don't
// exist.
#define GTM_WEAK __unsafe_unretained
#else
// With manual reference counting, __weak used to be silently ignored.
// clang r251041 gives it the ARC semantics instead. This means they
// now require a deployment target of 10.7, while some clients of GTM
// still target 10.6. In these cases, expand to __unsafe_unretained instead
#define GTM_WEAK
#endif
#endif
#endif // __OBJC__
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