Thorsten Ball mrnugget

Buy my Star Labs Starbook 14-inch

Short version: I'm selling my Star Labs Starbook. I'm just not using it enough.

Specs

Model: Star Labs Starbook 14-inch
OS: Ubuntu (I'll wipe and reinstall Ubuntu)
CPU: 2.10GHz 12-core Intel i7-1260P, Turbo Boost up to 4.70GHz
RAM: 32GB 3200MHz DDR4

Compile and run both files with (on Linux x86):

rustc --crate-type=staticlib gc_experiment4.rs && \
   gcc -O0 -g -o gc_experiment4 gc_experiment4.c -lgc_experiment4 -L. && \
  ./gc_experiment4

This will output the following:

UPDATE: See "Update" below

Problem

What can cause unaligned pointers to end up on my stack? Or: what, on my stack, can look like unaligned pointers?

Context is that I'm trying to write a conservative GC. I want to scan the stack for things that look like pointers (and then mark them, but I'm not at that point yet). I copied & hacked together some code from other GCs I found, which essentially does the following:

At program start: save the current %rbp away as the "stack bottom" (highest address)
When scanning stack: save now-current %rbp away as "stack top" (lowest address)

	use anyhow::Result;
	use std::convert::Infallible;
	use warp::Filter;

	struct Deferred<T: FnOnce()> {
	task: Option<T>,
	}

	impl<T: FnOnce()> Deferred<T> {
	fn abort(&mut self) {

	{
	"name": "Snazzy",
	"appearance": "dark",
	"style": {
	"background.appearance": "opaque",
	"border": "#1d2433",
	"border.variant": "#1d2433",
	"border.focused": "#8695b777",
	"border.selected": "#1d2433",
	"border.transparent": "#1d2433",

	package main

	import (
	"fmt"
	"log"
	"os/exec"
	"time"
	)

	func main() {

	// Compile with:
	// gcc $(pkg-config --cflags gtk4) -o main ./main.c $(pkg-config --libs gtk4) && ./main
	//
	// Run with:
	// ./main
	//
	// Reproduce issue:
	//
	// 1. Click on Page 2
	// 2. Select "view3" and type something.


	import SwiftUI

	struct ContentView: View {
	@EnvironmentObject private var appDelegate: AppDelegate

	var body: some View {
	let confirmQuitting = Binding<Bool>(get: {
	self.appDelegate.confirmQuit
	}, set: {

	use std::{
	alloc::{self, Layout},
	mem::size_of,
	};

	use crate::{
	heap::{AllocError, AllocResult},
	object::ObjectHeader,
	raw::RawPtr,
	};

	[gchb]: https://gchandbook.org/
	[clawing]: https://blog.mozilla.org/javascript/2013/07/18/clawing-our-way-back-to-precision/
	[gsgc]: https://piumarta.com/software/gsgc/index.shtml
	[migc]: https://github.com/playXE/migc
	[yarpenruntime]: https://github.com/mdlugajczyk/yarpen/blob/master/runtime/yarpen_runtime.c
	[bdwgc]: https://www.hboehm.info/gc/
	[bdwgcslides]: https://www.hboehm.info/gc/04tutorial.pdf
	[bdwdescr]: https://hboehm.info/gc/gcdescr.html
	[writinginterpretersinrust]: https://rust-hosted-langs.github.io/book/introduction.html
	[gcandrustpart0]: http://blog.pnkfx.org/blog/2015/10/27/gc-and-rust-part-0-how-does-gc-work/