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0xxd0
314 Stars 54 Forks MIT License 110 Commits 1 Opened issues

Description

A latest buildable and debuggable Objective-C runtime (objc4-818.2) project.

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This project is a buildable and debuggable version of latest Objective-C runtime (objc4-818.2) on Apple Open Source

Which Version To Use

| macOS | macOS Version | Xcode Version | objc4 tarball version | | - | - | - | - | | macOS Big Sur | macOS Version | Xcode 12.3 | objc4-818.2 | | macOS Catalina | macOS Version | Xcode 12.0 | objc4-787.1 | | macOS Catalina | macOS Version | Xcode 11.1 | objc4-781 | | macOS High Sierra | macOS Version | Xcode 10.1 | objc4-723 |

Installation

Manually

Download zip or clone this repo, select objc scheme and build.

Usage

After building the objc scheme, manually integrate generated

libobjc.A.dylib
into your project manually. Or you can use objc-inspect scheme which is a preset inspector for debugging objc4 runtime.

objc4 tarballs

Build Phases

Private Header

| objc header | #include | tarball | |------|--------|---------| | objc-os.h |

#include 
| /xnu-6153.41.3/bsd/sys/reason.h | | objc-os.h |
#include 
| /dyld-733.6/include/mach-o/dyldpriv.h | | objc-os.h | `#include <os/lockprivate.h>
| /libplatform-220/private/os/lock_private.h |
| lock_private.h |
#include
| /libplatform-220/private/os/base_private.h |
| objc-os.h |
#include
| removed in latest Libc tarball (Libc-1353.41.1), this header should be commented-out |
| objc-class.mm |
#include
| /xnu-7195.50.7.100.1/os/linker_set.h |
| pthread_machdep.h |
#include
| /xnu-6153.41.3/osfmk/machine/cpu_capabilities.h |
| objc-os.h |
#include
| /libpthread-416.40.3/private/workqueue_private.h | 
| objc-os.h |
#include
| /dyld-733.6/include/objc-shared-cache.h | 
| objc-errors.mm |
#include <simple.h>` | /libplatform-220/private/simple.h | | objc-block-trampolines.mm |
#include 
| /libclosure-74/Blockprivate.h | | objc-os.h | `#include <crtexterns.h>
| /Libc-1353.41.1/include/crt_externs.h |
| objc-runtime-new.mm |
#include
| /xnu-6153.41.3/osfmk/mach/shared_region.h |
| objc-cache.mm  |
#include
| /xnu-6153.41.3/osfmk/mach/restartable.defs, build from xnu kernel |
| objc-os.h |
#includenext
=>
#include
| /Libc-825.24/include/CrashReporterClient.h | 
| NSObject.mm |
#include <os/reason
private.h>
| /xnu-7195.50.7.100.1/os/reason_private |
| NSObject.mm |
#include
| /xnu-7195.50.7.100.1/os/reason_private |
| objc-exception.mm |
#include
| removed |
| objc-gdb.h |
#include ` | removed |

Private Header Included Header

| private header | #include | tarball | |------|--------|---------| | tsdprivate.h |

#include 
| /xnu-6153.41.3/libsyscall/os/tsd.h | | tsdprivate.h |

#include 
| /libpthread-416.40.3/private/spinlockprivate.h | | lockprivate.h |
#include 
| /libpthread-416.40.3/private/tsdprivate.h | | workqueueprivate.h |
#include 
| /llibpthread-416.40.3/private/qosprivate.h | | qosprivate.h |
#include 
| /libpthread-416.40.3/sys/qos_private.h |

Bridge OS

In public macosx sdk (latest Xcode 12.3), bridgeos (e.g.

__has_feature(attribute_availability_bridgeos)
) is unavailable, bridgeos availability should be removed or commented-out.

dyld

In latest dyld-733.6 (dyld-421.2 later), apple use this ruby script to expand versions, platfrom versions from a

versionSets
which defined in a YAML file, code generated by this script will be inserted after
@[email protected]
,
@[email protected]
,
@[email protected]
,
@[email protected]
and
@[email protected]
in
dyld_priv.h
. For more detail please refer to dyld.

XNU

 is generated form 
restartable.defs
in xnu tarball during building xun kernel, which is a little different from the one that shipped with public sdk that located in
/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/Kernel.framework/Versions/A/Headers/kern/restartable.h
.

Cambria framework

Have no idea about this framework so far, maybe related with

-loah
for lib
oah
. Related Code should be commented out for now.
// File objc-cache.mm
// 
// Line 87 ~ 88
#include 
#include 
// 
// ···
//
// Line 1121 ~ 1128 
if (oah_is_current_process_translated()) {
    kern_return_t ret = objc_thread_get_rip(threads[count], (uint64_t*)&pc);
    if (ret != KERN_SUCCESS) {
        pc = PC_SENTINEL;
    }
} else {
    pc = _get_pc_for_thread (threads[count]);
}

#include 

Have no idea about this haeder so far. Related Code should be commented out for now.

// File objc-runtime.mm
// 
// ···
//
// Line 36
#include  // os_feature_enabled_simple()
//
// ···
//
// Line 444 ~ 446
if (!os_feature_enabled_simple(objc4, preoptimizedCaches, true)) {
    DisablePreoptCaches = true;
}
// 

dyld_fall_2020_os_versions
,
dyld_fall_2018_os_versions

Found releated source in

xnu-7195.50.7.100.1/bsd/kern/kern_mman.c
.
static uint32_t
proc_2020_fall_os_sdk(void)

Maybe these function is releated to dyld build-scripts. Comment out for now.

dyld_platform_version_macOS_
,
dyld_platform_version_iOS_
,
dyld_platform_version_tvOS_
,
dyld_platform_version_watchOS_
,
dyld_platform_version_bridgeOS_

This Marco is generated by dyld build-scripts, comment out for now.

STATIC_ASSERT

objc4/runtime/objc-runtime-new.mm:176:1: '_static_assert' declared as an array with a negative size

Comment out for now.

Build Setting

| Declaration | Value | |-------------|-------| |

HEADER_SEARCH_PATHS
| $(SRCROOT)/../macosx.internal/System/Library/Frameworks/System.framework/PrivateHeaders, also append
$(inherited)
to target objc | |
GCC_PREPROCESSOR_DEFINITIONS
| LIBCNOLIBCRASHREPORTERCLIENT, also append
$(inherited)
to target objc | |
ORDER_FILE
| $(SRCROOT)/libobjc.order | |
OTHER_LDFLAGS[sdk=macosx*]
| -lc++abi -Xlinker -sectalign -Xlinker _DATA -Xlinker _objcdata -Xlinker 0x1000 -Xlinker -interposablelist -Xlinker interposable.txt, remove build setting in target objc | |
OTHER_LDFLAGS[sdk=iphoneos*][arch=*]
| -lc++abi -Wl,-segalign,0x4000 -Xlinker -sectalign -Xlinker _DATA -Xlinker _objcdata -Xlinker 0x1000 -Xlinker -interposablelist -Xlinker interposable.txt, remove build setting in target objc | |
OTHER_LDFLAGS[sdk=iphonesimulator*][arch=*]
| -lc++abi -Xlinker -interposable_list -Xlinker interposable.txt, remove build setting in target objc |

Run Script

Evidently public macosx sdk is our only choice, we need to update value of parameter

-sdk
from
macosx.internal
to
macosx
in run script of objc target.

License

This project is released under the MIT License. The objc4 project is released under the APPLE PUBLIC SOURCE LICENSE Version 2.0.

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