jmeggitt

Idiomatic FFI in Rust

Pointer concepts

Due to niche optimization, Rust will guarentee that the following types will all have the same layout in memory. However, each option comes with different guarentees and should be selected accordingly.

Non-null

• &T
• &mut T
• NonNull<T>
  • *mut T, but non-zero and covariant
• Box<T>
• Same aliasing rules as &mut T

jmeggitt

{"fw":5080,"mver":"2.6.2","lts":3411695,"endtime":1665720293,"dst_name":"hitlist-rr6.hitlist.sdstrowes.co.uk","ttr":5091.217282,"dst_addr":"2408:815f:e000:1:18:1:0:14","src_addr":"fe80::dc6a:8c0f:b28c:9470","proto":"UDP","af":6,"size":48,"paris_id":2,"result":[{"hop":1,"result":[{"error":"bind failed: Invalid argument"}]}],"msm_id":24304870,"prb_id":1004666,"timestamp":1665720293,"msm_name":"Traceroute","from":"","type":"traceroute","group_id":24304869}
{"fw":5080,"mver":"2.6.2","lts":1,"endtime":1665720353,"dst_name":"202.12.27.33","dst_addr":"202.12.27.33","src_addr":"185.81.99.40","proto":"UDP","af":4,"size":40,"paris_id":9,"result":[{"hop":1,"result":[{"error":"sendto failed: Operation not permitted"}]}],"msm_id":5006,"prb_id":1000318,"timestamp":1665720353,"msm_name":"Traceroute","from":"185.81.99.40","type":"traceroute"}
{"fw":5070,"mver":"2.6.1","lts":28,"endtime":1665721102,"dst_name":"topology6.dyndns.atlas.ripe.net","ttr":126.817471,"dst_addr":"2a0f:14c0::1","src_addr":"2803:9400:454a:2d5a:ea94:f6ff

jmeggitt

import cProfile, pstats
from pstats import SortKey
pr = cProfile.Profile()
pr.enable()

def end_profile(log_file):
        pr.disable()
        with open(log_file, "w") as profile_out:
                profile_stats = pstats.Stats(pr, stream=profile_out).sort_stats(SortKey.CUMULATIVE)
                profile_stats.print_stats()

jmeggitt

(Incomplete)

Crate	Type	Owned	Sync	Send	Mutable	Inner Mutability	Description
[bytes]	[Bytes]	❌*	✔️	✔️	❌	❌	Provides zero-copy sharing of byte buffers. A group of [Bytes]/[BytesMut] can share ownership of the underlying buffer similar to an Arc.
[bytes]	[BytesMut]	✔️*	✔️	✔️	✔️	❌	Similar to [Bytes] in functionality, but for exclusive ownership of a portion of a buffer.
[smallvec]	SmallVec<[T;N]>	✔️	❔	❔	✔️	❌	Functions the same as a regular Vec<T>, but stores the first N elements on the stack before allocating space on the heap.
[generic-array]	[GenericArray]	✔️	:grey_quest

jmeggitt

[INFO][amethyst::app] Initializing Amethyst...
[INFO][amethyst::app] Version: 0.13.2
[INFO][amethyst::app] Platform: x86_64-pc-windows-msvc
[INFO][amethyst::app] Amethyst git commit:
[INFO][amethyst::app] Rustc version: 1.39.0 Stable
[INFO][amethyst::app] Rustc git commit: 4560ea788cb760f0a34127156c78e2552949f734
[INFO][winit::platform::platform::window] Guessed window DPI factor: 1
[WARN][rendy_factory::factory] Slow safety checks are enabled! Disable them in production by enabling the 'no-slow-safety-checks' feature!
[INFO][rendy_util::wrap] Slow safety checks are enabled! You can disable them in production by enabling the 'no-slow-safety-checks' feature!
[INFO][gfx_backend_vulkan]

jmeggitt

//! The idea of this system is to abstract the Set type, remove the need for `pop_insertion_event`
//! and `pop_removal_event`, and abstract the maintain functions of both worlds. The only issue I
//! have had so far is trying to figure out what WorldStorage should be responsible over compared to
//! GeometricalWorld.
//!
//! Goal:
//!  - Give ecs control over how storages are maintained
//!  - Make the implementation of Set consistent for bodies, colliders, and constraints
//!  - Bundle all of the storages into one convenient struct (low priority)
#![allow(missing_docs)]

jmeggitt

use specs::{WriteStorage, WriteExpect, ReadStorage, SystemData, Join, Resources, Component, BitSet};
use specs::storage::UnprotectedStorage;
use specs::Entity;
use specs::shred::ResourceId;
use specs::storage::{MaskedStorage, AnyStorage, FlaggedStorage, DenseVecStorage};
use specs::shred::MetaTable;
use specs::storage::TryDefault;

use nphysics::object::BodyHandle;
use nphysics::object::RigidBody;

jmeggitt

Prefab(
    entities: [
        // Grey bat
        PrefabEntity(
            data: MyPrefabData(
                // SpriteScenePrefab
                sprite_scene: (
                    // SpriteSheetPrefab with index 0
                    sheet: Sheet(
                        // TexturePrefab

jmeggitt

thread '<unnamed>' panicked at 'Already borrowed mutably: InvalidBorrow', src\libcore\result.rs:997:5
stack backtrace:
   0: std::sys::windows::backtrace::set_frames
             at /rustc/94fd0458951a4ff91c03366445f0e2e93b86bd2f\/src\libstd\sys\windows\backtrace\mod.rs:95
   1: std::sys::windows::backtrace::unwind_backtrace
             at /rustc/94fd0458951a4ff91c03366445f0e2e93b86bd2f\/src\libstd\sys\windows\backtrace\mod.rs:82
   2: std::sys_common::backtrace::_print
             at /rustc/94fd0458951a4ff91c03366445f0e2e93b86bd2f\/src\libstd\sys_common\backtrace.rs:71
   3: std::sys_common::backtrace::print
             at /rustc/94fd0458951a4ff91c03366445f0e2e93b86bd2f\/src\libstd\sys_common\backtrace.rs:59

jmeggitt

error: failed to run custom build command for `survival v0.1.0 (C:\Users\Jasper\IdeaProjects\survival)`
process didn't exit successfully: `C:\Users\Jasper\IdeaProjects\survival\target\release\build\survival-253dead4bb388bc2\build-script-build` (exit code: 101)
--- stderr
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: ParseIntError { kind: InvalidDigit }', src\libcore\result.rs:997:5
stack backtrace:
   0: std::sys::windows::backtrace::set_frames
             at /rustc/94fd0458951a4ff91c03366445f0e2e93b86bd2f\/src\libstd\sys\windows\backtrace\mod.rs:95
   1: std::sys::windows::backtrace::unwind_backtrace
             at /rustc/94fd0458951a4ff91c03366445f0e2e93b86bd2f\/src\libstd\sys\windows\backtrace\mod.rs:82
   2: std::sys_common::backtrace::_print