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@steipete
steipete / WeakDetector.m
Last active December 21, 2017 17:54
///////////////////////////////////////////////////////////////////////////////////////////
#pragma mark - Warn if we KVO a weak property
// Doesn't support key paths.
static BOOL PSPDFIsWeakProperty(id object, NSString *keyPath) {
objc_property_t property = class_getProperty([object class], keyPath.UTF8String);
if (property) {
// https://developer.apple.com/library/mac/documentation/cocoa/conceptual/objcruntimeguide/articles/ocrtpropertyintrospection.html
const char *attributes = property_getAttributes(property);
return attributes && strstr(attributes, ",W");
@incanus
incanus / increment-build-number.sh
Created October 24, 2013 19:54
INFO=$( echo $TARGET_BUILD_DIR )/$( echo $INFOPLIST_PATH | sed -e 's/\.plist$//' )
echo $INFO
TAG=
COMMIT=
CURRENT=
CURRENT_BUILD=
GITPATH=/usr/bin:/usr/local/bin:/usr/local/git/bin
PATH=$PATH:$GITPATH; export PATH
if [ -z $( which git ) ]; then
@kyleve
kyleve / gist:8213806
Created January 2, 2014 01:46
/**
Provides the ability to verify key paths at compile time.
If "keyPath" does not exist, a compile-time error will be generated.
Example:
// Verifies "isFinished" exists on "operation".
NSString *key = SQKeyPath(operation, isFinished);
// Verifies "isFinished" exists on self.
@jspahrsummers
jspahrsummers / GHReadWriteQueue.h
Last active December 22, 2016 16:15
Non-blocking mutual exclusion with readers and writers, for asynchronous operations that may span more than one GCD block (making a single concurrent GCD queue unsuitable).
//
// GHReadWriteQueue.h
// GitHub
//
// Created by Justin Spahr-Summers on 2014-03-24.
// Copyright (c) 2014 GitHub. All rights reserved.
//
#import <Foundation/Foundation.h>
@porglezomp
porglezomp / CompareChain.swift
Created June 7, 2019 20:45
Let's do horrible crimes with overloads, in order to get Python-style comparison chaining!
infix operator <: ChainComparison
infix operator >: ChainComparison
infix operator ==: ChainComparison
infix operator !=: ChainComparison
infix operator <=: ChainComparison
infix operator >=: ChainComparison
precedencegroup ChainComparison {
associativity: left
}
@BigZaphod
BigZaphod / Indirect.swift
Created May 18, 2022 03:00
//
// A Swift property wrapper for adding "indirect" to struct properties.
// Enum supports this out of the box, but for some reason struct doesn't.
//
// This is useful when you want to do something recursive with structs like:
//
// struct Node {
// var next: Node?
// }
//
@schwa
schwa / libfuzzer.md
Last active June 27, 2025 01:22
Using LLVM's libfuzzer with Swift

Using LLVM's libfuzzer with Swift

Background

Of the many tools available for fuzzing, I've found that LLVM's libfuzzer is the easiest to use for Swift on macOS. Other tools seem to have a list of requirements taht are difficult to meet. libfuzzer on the other hand is built into LLVM and is available on macOS in the custom Swift toolchains: https://www.swift.org/download/

In this document I'll describe how to use libfuzzer with Swift and Swift Packages.

I used this setup to fuzz an SVG Renderer package that I am building. I was able to find and fix a number of bugs in my SVG parsing code using libfuzzer in basically no time at all.