| // ============================================================================= | |
| // XNU kperf/kpc demo | |
| // Available for 64-bit Intel/Apple Silicon, macOS/iOS, with root privileges | |
| // | |
| // | |
| // Demo 1 (profile a function in current thread): | |
| // 1. Open directory '/usr/share/kpep/', find your CPU PMC database. | |
| // M1 (Pro/Max/Ultra): /usr/share/kpep/a14.plist | |
| // M2 (Pro/Max): /usr/share/kpep/a15.plist | |
| // M3: /usr/share/kpep/as1.plist |
The attached lldb command pblock command lets you peek inside an Objective-C block. It tries to tell you where to find the source code for the block, and the values captured by the block when it was created.
Consider this example program:
#import <Foundation/Foundation.h>
@interface Foo: NSObject
@end
@implementation Foo
Consumer key: IQKbtAYlXLripLGPWd0HUA
Consumer secret: GgDYlkSvaPxGxC4X8liwpUoqKwwr3lCADbz8A7ADU
Consumer key: 3nVuSoBZnx6U4vzUxf5w
Consumer secret: Bcs59EFbbsdF6Sl9Ng71smgStWEGwXXKSjYvPVt7qys
Consumer key: iAtYJ4HpUVfIUoNnif1DA
| /* =============================================================== | |
| * SDEFL | |
| * =============================================================== | |
| * public domain - no warranty implied; use at your own risk | |
| * References: | |
| https://bitbucket.org/rmitton/tigr/src/be3832bee7fb2f274fe5823e38f8ec7fa94e0ce9/src/tigr_inflate.c?at=default&fileviewer=file-view-default | |
| https://github.com/github/putty/blob/49fb598b0e78d09d6a2a42679ee0649df482090e/sshzlib.c | |
| https://www.ietf.org/rfc/rfc1951.txt | |
| */ | |
| #include <stdlib.h> |
Before you continue, if you don't know what IMGUI is don't bother reading this post, just ignore it, don't write anything in comments section, etc. If you're curious about IMGUI see bottom of this post, otherwise continue whatever you were doing, this post it's not for you. Thanks!
If you know what IMGUI is, for context read following presentations and blog posts:
| Brief explanation what I did to get the speed-up, and the thought process behind it. | |
| The original code went: | |
| EnterLoop: | |
| movaps xmm3, xmmword ptr [edx+ecx*2] // Box1YZ | |
| cmpnltps xmm3, xmm2 | |
| movmskps eax, xmm3 | |
| cmp eax, 0Ch |
| #!/boot/bzImage | |
| # Linux kernel userspace initialization code, translated to bash | |
| # (Minus floppy disk handling, because seriously, it's 2017.) | |
| # Not 100% accurate, but gives you a good idea of how kernel init works | |
| # GPLv2, Copyright 2017 Hector Martin <marcan@marcan.st> | |
| # Based on Linux 4.10-rc2. | |
| # Note: pretend chroot is a builtin and affects the current process | |
| # Note: kernel actually uses major/minor device numbers instead of device name |
Orthodox C++ (sometimes referred as C+) is minimal subset of C++ that improves C, but avoids all unnecessary things from so called Modern C++. It's exactly opposite of what Modern C++ suppose to be.
| struct DecodeResult { | |
| uint32_t codepoint; | |
| uint32_t decodedBytes; | |
| }; | |
| static inline struct DecodeResult DecodeOneUTF8(const uint8_t *utf8) { | |
| static uint8_t byteCountTable[16] = { | |
| // 0xxx | |
| [0x0] = 1, | |
| [0x1] = 1, |
| #import <UIKit/UIKit.h> | |
| /** | |
| Show Screen FPS... | |
| The maximum fps in OSX/iOS Simulator is 60.00. | |
| The maximum fps on iPhone is 59.97. | |
| The maxmium fps on iPad is 60.0. | |
| */ | |
| @interface YYFPSLabel : UILabel |
