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@shafik
shafik / WhatIsStrictAliasingAndWhyDoWeCare.md
Last active May 24, 2024 03:47
What is Strict Aliasing and Why do we Care?

What is the Strict Aliasing Rule and Why do we care?

(OR Type Punning, Undefined Behavior and Alignment, Oh My!)

What is strict aliasing? First we will describe what is aliasing and then we can learn what being strict about it means.

In C and C++ aliasing has to do with what expression types we are allowed to access stored values through. In both C and C++ the standard specifies which expression types are allowed to alias which types. The compiler and optimizer are allowed to assume we follow the aliasing rules strictly, hence the term strict aliasing rule. If we attempt to access a value using a type not allowed it is classified as undefined behavior(UB). Once we have undefined behavior all bets are off, the results of our program are no longer reliable.

Unfortunately with strict aliasing violations, we will often obtain the results we expect, leaving the possibility the a future version of a compiler with a new optimization will break code we th

@myusuf3
myusuf3 / delete_git_submodule.md
Created November 3, 2014 17:36
How effectively delete a git submodule.

To remove a submodule you need to:

  • Delete the relevant section from the .gitmodules file.
  • Stage the .gitmodules changes git add .gitmodules
  • Delete the relevant section from .git/config.
  • Run git rm --cached path_to_submodule (no trailing slash).
  • Run rm -rf .git/modules/path_to_submodule (no trailing slash).
  • Commit git commit -m "Removed submodule "
  • Delete the now untracked submodule files rm -rf path_to_submodule
@Earnestly
Earnestly / c99_ub_list.rst
Last active May 10, 2024 23:14
C99 List of Undefined Behavior (193 Cases)

C99 List of Undefined Behavior

From N1256: (See http://port70.net/~nsz/c/c99/n1256.html#J.2)

  • A "shall" or "shall not" requirement that appears outside of a constraint is violated (clause 4).
  • A nonempty source file does not end in a new-line character which is not immediately preceded by a backslash character or ends in a partial preprocessing token or comment (5.1.1.2).
  • Token concatenation produces a character sequence matching the syntax of a universal character name (5.1.1.2).
  • A program in a hosted environment does not define a function named main using one of the specified forms (5.1.2.2.1).
  • A character not in the basic source character set is encountered in a source file, except in an identifier, a character constant, a string literal, a header name, a comment, or a preprocessing token that is never converted to a token (5.2.1).
  • An identifier, comment, string literal, character constant, or header name contains an invalid multibyte character or does not
@PixelSergey
PixelSergey / dump.md
Last active April 24, 2024 17:08
Dump games with godmode9

Dumping games with Godmode9

Dumping games is the act of taking a game from your system or gamecart and copying it into a readable format onto your SD card. Dumping is perfectly legal if you keep the dumps to yourself, however sharing these dumps is piracy and is illegal.

This guide will tell you how to dump games from various formats and for various purposes. Dumping 3DS cartriges as .cia files is good if you want to install them to your system. Dumping them as .3ds files is good for emulators. Installed titles cannot be dumped as .3ds files. NDS cartiges can only be dumped as .nds files and cannot be installed (however, you can play them with emulators or flashcarts).

Dumping the RomFS of a game is primarily for romhacking purposess.

@paragonie-scott
paragonie-scott / crypto-wrong-answers.md
Last active April 21, 2024 23:48
An Open Letter to Developers Everywhere (About Cryptography)
@cuppster
cuppster / node-express-cors-middleware.js
Created April 9, 2012 16:02
express.js middleware to support CORS pre-flight requests
app.use(express.methodOverride());
// ## CORS middleware
//
// see: http://stackoverflow.com/questions/7067966/how-to-allow-cors-in-express-nodejs
var allowCrossDomain = function(req, res, next) {
res.header('Access-Control-Allow-Origin', '*');
res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE');
res.header('Access-Control-Allow-Headers', 'Content-Type, Authorization');
@maxcountryman
maxcountryman / bf.c
Created January 29, 2012 17:20
A simple brainfuck interpreter in C
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
// initialize the tape with 30,000 zeroes
unsigned char tape[30000] = {0};
// set the pointer to point at the left-most cell of the tape
unsigned char* ptr = tape;
@eligrey
eligrey / object-watch.js
Created April 30, 2010 01:38
object.watch polyfill in ES5
/*
* object.watch polyfill
*
* 2012-04-03
*
* By Eli Grey, http://eligrey.com
* Public Domain.
* NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
*/
@davidnunez
davidnunez / gist:1404789
Created November 29, 2011 13:20
list all installed packages in android adb shell
pm list packages -f