Add shared item references and native container transfer behavior

benchmarks/rust-simple-container-2026-10-07/scoped-parity.json

@@ -0,0 +1,272 @@
+{
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+  "platform": "Linux-7.0.0-31-generic-x86_64-with-glibc2.43",
+  "java": "openjdk 25.0.4.1 2026-08-18",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)",
+  "fixtures": 6273,
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+    "crates/horizon-world/examples/simple_container_fixture.rs": "72eeb6dd9ae37b35643d9231047785dae0307d396ec2850e865f18a554580928"
+  },
+  "fixtures_sha256": {
+    ".local/rust-simple-container-parity/inputs.txt": "4335da72561507dd19276c020cd198aa0d91d9034839f83707fcf75b4cc3df6b"
+  },
+  "rust_output_sha256": "d8d71155d43f9cd6874344c27da2b0a07eaca7803592dfe53d98347c0dff12a5",
+  "references": [
+    {
+      "side": "client",
+      "jar_sha256": "4508d006323f24fa02876310c192d739af56516eb259000ac50f0909a68c9a2d",
+      "output_sha256": "d8d71155d43f9cd6874344c27da2b0a07eaca7803592dfe53d98347c0dff12a5",
+      "matched_output_lines": 590402
+    },
+    {
+      "side": "server",
+      "jar_sha256": "a362163eec5d1612d520772bc16e5b39c09e3b234fdc045f56bf544284ee8ae6",
+      "output_sha256": "d8d71155d43f9cd6874344c27da2b0a07eaca7803592dfe53d98347c0dff12a5",
+      "matched_output_lines": 590402
+    }
+  ],
+  "scope": "Actual SimpleContainer get/set/add/removal, reverse remove-by-type, clear/remove-all, can-add and count queries over real shared ItemStack storage. Small native prototypes expose component equality and copy isolation; alias identities and raw/visible state are traced. Native size/change callbacks cover mutations and failures before/after storage writes. Rust uses production reference-counted stack storage and container methods. Persistence, recipe accounting, arbitrary getItem/setItem overrides, player inventory/menu transactions, full component values and complete gameplay integration remain pending."
+}

crates/horizon-world/examples/simple_container_fixture.rs

@@ -0,0 +1,253 @@
+use horizon_world::{
+    component_patch::{Patch, Prototype},
+    item_stack_refs::{ItemStacks, StackRef},
+    simple_container::{ContainerHooks, SimpleContainer},
+};
+use serde_json::Value;
+use std::{
+    fs,
+    io::{self, Write},
+    path::Path,
+};
+type Stack = StackRef<u8, usize, i32>;
+type Container = SimpleContainer<u8, usize, i32>;
+fn integer(v: &Value, k: &str) -> i32 {
+    v[k].as_i64().unwrap() as i32
+}
+fn opt(v: Option<i32>) -> String {
+    v.map_or("none".into(), |v| v.to_string())
+}
+fn max(s: &Stack) -> i32 {
+    s.read().component(&0).copied().unwrap_or(1)
+}
+struct World {
+    out: io::BufWriter<fs::File>,
+    refs: Vec<Stack>,
+    ids: Vec<Stack>,
+    empty: Stack,
+    op: Value,
+    calls: i32,
+}
+impl World {
+    fn snapshot(&mut self, s: &Stack) -> String {
+        let id = self
+            .ids
+            .iter()
+            .position(|v| v.same_reference(s))
+            .unwrap_or_else(|| {
+                self.ids.push(s.clone());
+                self.ids.len() - 1
+            });
+        let s = s.read();
+        let patch = s.components.as_patch();
+        format!(
+            "{} {} {} {} {} {} {} | {} | {}",
+            id,
+            s.item(),
+            s.count,
+            s.count(),
+            s.pop_time,
+            s.is_empty(),
+            s.component(&0).copied().unwrap_or(1),
+            (0..3)
+                .map(|k| opt(s.component(&k).copied()))
+                .collect::<Vec<_>>()
+                .join(","),
+            patch
+                .entries()
+                .iter()
+                .map(|(k, v)| format!("{k}={}", opt(*v)))
+                .collect::<Vec<_>>()
+                .join(",")
+        )
+    }
+    fn all(&mut self, c: &Container) {
+        for i in 0..self.refs.len() {
+            let s = self.snapshot(&self.refs[i].clone());
+            writeln!(self.out, "ref {i} {s}").unwrap();
+        }
+        for (i, s) in c.items().iter().enumerate() {
+            let s = self.snapshot(s);
+            writeln!(self.out, "slot {i} {s}").unwrap();
+        }
+        let s = self.snapshot(&self.empty.clone());
+        writeln!(self.out, "empty {s}").unwrap();
+        writeln!(
+            self.out,
+            "container {} {} {} {} {}",
+            c.size(),
+            c.is_empty(),
+            c.count_item(0),
+            c.count_item(1),
+            c.count_item(2)
+        )
+        .unwrap();
+    }
+    fn event(&mut self, c: &mut Container, name: &str) -> Result<(), ()> {
+        self.calls += 1;
+        writeln!(self.out, "event {name} {}", self.calls).unwrap();
+        self.all(c);
+        if self.calls == integer(&self.op, "fail_at") {
+            return Err(());
+        }
+        if self.calls == integer(&self.op, "mutate_at") {
+            let i = integer(&self.op, "mutate_ref") as usize;
+            let mut s = self.refs[i].write();
+            s.count = integer(&self.op, "after_count");
+            s.components
+                .set(0, Some(integer(&self.op, "after_max")))
+                .map_err(|_| ())?;
+            drop(s);
+            let slot = integer(&self.op, "mutate_slot");
+            if slot >= 0 && (slot as usize) < c.size() {
+                c.items_mut()[slot as usize] =
+                    self.refs[integer(&self.op, "replace_ref") as usize].clone();
+            }
+        }
+        Ok(())
+    }
+}
+impl ContainerHooks<u8, usize, i32> for World {
+    type Error = ();
+    fn max_stack_size(&mut self, c: &mut Container) -> Result<i32, ()> {
+        self.event(c, "max")?;
+        Ok(integer(&self.op, "max"))
+    }
+    fn item_max_stack_size(&self, s: &Stack) -> i32 {
+        max(s)
+    }
+    fn changed(&mut self, c: &mut Container) -> Result<(), ()> {
+        self.event(c, "changed")
+    }
+}
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let arg = std::env::args().nth(1).unwrap();
+    let dir = Path::new(&arg);
+    let mut out = io::BufWriter::new(fs::File::create(dir.join("rust.txt"))?);
+    for line in fs::read_to_string(dir.join("inputs.txt"))?.lines() {
+        let f: Value = serde_json::from_str(line)?;
+        let prototypes: Vec<_> = f["prototypes"]
+            .as_array()
+            .unwrap()
+            .iter()
+            .map(|p| {
+                Prototype::new(p.as_array().unwrap().iter().map(|v| {
+                    (
+                        v[0].as_u64().unwrap() as usize,
+                        v[1].as_i64().unwrap() as i32,
+                    )
+                }))
+            })
+            .collect();
+        let stacks = ItemStacks::new(0);
+        let empty = stacks.empty();
+        let refs: Vec<_> = f["stacks"]
+            .as_array()
+            .unwrap()
+            .iter()
+            .map(|v| {
+                let item = integer(v, "item");
+                if item < 0 {
+                    empty.clone()
+                } else {
+                    let s = stacks.create(
+                        item as u8,
+                        integer(v, "count"),
+                        prototypes[item as usize].clone(),
+                    );
+                    s.write().pop_time = integer(v, "pop");
+                    s.write().components.restore_patch(&Patch::new(
+                        v["patch"].as_array().unwrap().iter().map(|v| {
+                            (
+                                v[0].as_u64().unwrap() as usize,
+                                v[1].as_i64().map(|n| n as i32),
+                            )
+                        }),
+                    ));
+                    s
+                }
+            })
+            .collect();
+        let mut c = Container::from_items(
+            f["slots"]
+                .as_array()
+                .unwrap()
+                .iter()
+                .map(|i| refs[i.as_u64().unwrap() as usize].clone())
+                .collect(),
+            stacks.clone(),
+        );
+        let mut w = World {
+            out,
+            refs,
+            ids: vec![empty.clone()],
+            empty,
+            op: Value::Null,
+            calls: 0,
+        };
+        w.all(&c);
+        for op in f["ops"].as_array().unwrap() {
+            w.op = op.clone();
+            w.calls = 0;
+            let a = integer(op, "a") as usize;
+            let b = integer(op, "b") as usize;
+            let slot = integer(op, "slot");
+            let amount = integer(op, "amount");
+            let result = (|| -> Result<(), ()> {
+                match op["kind"].as_str().unwrap() {
+                    "set" => c.set(slot, w.refs[a].clone(), &mut w).map_err(|_| ())?,
+                    "add" => {
+                        let input = w.refs[a].clone();
+                        w.refs[b] = c.add(&input, &mut w).map_err(|_| ())?;
+                    }
+                    "remove" => w.refs[b] = c.remove(slot, amount, &mut w).map_err(|_| ())?,
+                    "remove-type" => {
+                        let i = integer(op, "item") as usize;
+                        w.refs[b] = c
+                            .remove_type(i as u8, prototypes[i].clone(), amount, &mut w)
+                            .map_err(|_| ())?;
+                    }
+                    "no-update" => w.refs[b] = c.remove_no_update::<()>(slot).map_err(|_| ())?,
+                    "clear" => c.clear(&mut w).map_err(|_| ())?,
+                    "all" => {
+                        let result = c.remove_all(&mut w).map_err(|_| ())?;
+                        writeln!(w.out, "all-size {}", result.len()).unwrap();
+                        for s in result {
+                            let s = w.snapshot(&s);
+                            writeln!(w.out, "removed {s}").unwrap();
+                        }
+                    }
+                    "can-add" => {
+                        let v = c.can_add(&w.refs[a], &w);
+                        writeln!(w.out, "can-add {v}").unwrap();
+                    }
+                    "get" => w.refs[b] = c.get(slot),
+                    "alias" => w.refs[b] = w.refs[a].clone(),
+                    "copy" => w.refs[b] = stacks.copy(&w.refs[a]),
+                    "count" => w.refs[a].write().count = amount,
+                    "component" => {
+                        w.refs[a]
+                            .write()
+                            .components
+                            .set(
+                                integer(op, "key") as usize,
+                                op["value"].as_i64().map(|n| n as i32),
+                            )
+                            .map_err(|_| ())?;
+                    }
+                    _ => panic!("operation"),
+                }
+                Ok(())
+            })();
+            writeln!(
+                w.out,
+                "result {} {}",
+                if result.is_ok() { "ok" } else { "error" },
+                w.calls
+            )?;
+            w.all(&c);
+        }
+        out = w.out;
+    }
+    Ok(())
+}

crates/horizon-world/src/item_stack_refs.rs

@@ -0,0 +1,64 @@
+//! Shared stack identity for inventories. Cloning a reference retains the same
+//! stack; `ItemStacks::copy` copies its value with copy-on-write components.
+//! These references belong to the simulation thread and release unreachable
+//! stacks automatically. No borrow is held across a container callback.
+use crate::{
+    component_patch::Prototype,
+    item_stack_storage::{CopyResult, ItemStackData},
+};
+use std::{
+    cell::{Ref, RefCell, RefMut},
+    rc::Rc,
+};
+#[derive(Debug)]
+pub struct StackRef<I, K, V>(Rc<RefCell<ItemStackData<I, K, V>>>);
+impl<I, K, V> Clone for StackRef<I, K, V> {
+    fn clone(&self) -> Self {
+        Self(self.0.clone())
+    }
+}
+impl<I, K, V> StackRef<I, K, V> {
+    pub fn new(data: ItemStackData<I, K, V>) -> Self {
+        Self(Rc::new(RefCell::new(data)))
+    }
+    pub fn read(&self) -> Ref<'_, ItemStackData<I, K, V>> {
+        self.0.borrow()
+    }
+    pub fn write(&self) -> RefMut<'_, ItemStackData<I, K, V>> {
+        self.0.borrow_mut()
+    }
+    pub fn same_reference(&self, other: &Self) -> bool {
+        Rc::ptr_eq(&self.0, &other.0)
+    }
+}
+#[derive(Clone, Debug)]
+pub struct ItemStacks<I, K, V> {
+    air: I,
+    empty: StackRef<I, K, V>,
+}
+impl<I: Copy + Eq, K: Clone + Eq, V: Clone + PartialEq> ItemStacks<I, K, V> {
+    pub fn new(air: I) -> Self {
+        Self {
+            air,
+            empty: StackRef::new(ItemStackData::new(air, air, 0, Prototype::new([]))),
+        }
+    }
+    pub fn empty(&self) -> StackRef<I, K, V> {
+        self.empty.clone()
+    }
+    pub fn create(&self, item: I, count: i32, prototype: Prototype<K, V>) -> StackRef<I, K, V> {
+        StackRef::new(ItemStackData::new(item, self.air, count, prototype))
+    }
+    pub fn resolve(&self, copy: CopyResult<ItemStackData<I, K, V>>) -> StackRef<I, K, V> {
+        match copy {
+            CopyResult::Empty => self.empty(),
+            CopyResult::Stack(data) => StackRef::new(data),
+        }
+    }
+    pub fn copy(&self, stack: &StackRef<I, K, V>) -> StackRef<I, K, V> {
+        self.resolve(stack.read().copy())
+    }
+    pub fn split(&self, stack: &StackRef<I, K, V>, amount: i32) -> StackRef<I, K, V> {
+        self.resolve(stack.write().split(amount))
+    }
+}

crates/horizon-world/src/lib.rs

@@ -93,3 +93,6 @@ pub mod world_ray;
 pub mod worldgen;
 
 pub const DATA_VERSION: i32 = 5023;
+
+pub mod item_stack_refs;
+pub mod simple_container;

crates/horizon-world/src/simple_container.rs

@@ -0,0 +1,220 @@
+//! SimpleContainer storage and transfers using shared stack references.
+//! Item component semantics and the virtual size/change hooks are supplied by
+//! the caller. Menu transactions, persistence and recipe accounting are separate.
+use crate::{
+    component_patch::Prototype,
+    item_stack_refs::{ItemStacks, StackRef},
+};
+#[derive(Debug)]
+pub enum ContainerError<E> {
+    Index,
+    Callback(E),
+}
+pub type ContainerResult<T, E> = Result<T, ContainerError<E>>;
+#[derive(Debug)]
+pub struct SimpleContainer<I, K, V> {
+    items: Vec<StackRef<I, K, V>>,
+    stacks: ItemStacks<I, K, V>,
+}
+pub trait ContainerHooks<I, K, V> {
+    type Error;
+    /// Native getMaxStackSize(), normally 99; called before the item's limit.
+    fn max_stack_size(
+        &mut self,
+        container: &mut SimpleContainer<I, K, V>,
+    ) -> Result<i32, Self::Error>;
+    fn item_max_stack_size(&self, stack: &StackRef<I, K, V>) -> i32;
+    fn changed(&mut self, container: &mut SimpleContainer<I, K, V>) -> Result<(), Self::Error>;
+}
+impl<I: Copy + Eq, K: Clone + Eq, V: Clone + PartialEq> SimpleContainer<I, K, V> {
+    pub fn new(size: usize, stacks: ItemStacks<I, K, V>) -> Self {
+        Self {
+            items: vec![stacks.empty(); size],
+            stacks,
+        }
+    }
+    /// Like the native varargs constructor, this retains aliases without limits.
+    pub fn from_items(items: Vec<StackRef<I, K, V>>, stacks: ItemStacks<I, K, V>) -> Self {
+        Self { items, stacks }
+    }
+    pub fn items(&self) -> &[StackRef<I, K, V>] {
+        &self.items
+    }
+    pub fn items_mut(&mut self) -> &mut [StackRef<I, K, V>] {
+        &mut self.items
+    }
+    pub fn size(&self) -> usize {
+        self.items.len()
+    }
+    pub fn is_empty(&self) -> bool {
+        self.items.iter().all(|s| s.read().is_empty())
+    }
+    pub fn get(&self, index: i32) -> StackRef<I, K, V> {
+        usize::try_from(index)
+            .ok()
+            .and_then(|i| self.items.get(i))
+            .cloned()
+            .unwrap_or_else(|| self.stacks.empty())
+    }
+    pub fn count_item(&self, item: I) -> i32 {
+        self.items.iter().fold(0_i32, |total, s| {
+            let s = s.read();
+            if s.item() == item {
+                total.wrapping_add(s.count())
+            } else {
+                total
+            }
+        })
+    }
+    pub fn can_add<H: ContainerHooks<I, K, V>>(
+        &self,
+        stack: &StackRef<I, K, V>,
+        hooks: &H,
+    ) -> bool {
+        self.items.iter().any(|s| {
+            s.read().is_empty()
+                || (s.read().same_item_components(&stack.read())
+                    && s.read().count() < hooks.item_max_stack_size(s))
+        })
+    }
+    fn limit<H: ContainerHooks<I, K, V>>(
+        &mut self,
+        stack: &StackRef<I, K, V>,
+        hooks: &mut H,
+    ) -> Result<i32, ContainerError<H::Error>> {
+        let container = hooks
+            .max_stack_size(self)
+            .map_err(ContainerError::Callback)?;
+        Ok(container.min(hooks.item_max_stack_size(stack)))
+    }
+    pub fn set<H: ContainerHooks<I, K, V>>(
+        &mut self,
+        index: i32,
+        stack: StackRef<I, K, V>,
+        hooks: &mut H,
+    ) -> Result<(), ContainerError<H::Error>> {
+        let slot = usize::try_from(index)
+            .ok()
+            .and_then(|i| self.items.get_mut(i))
+            .ok_or(ContainerError::Index)?;
+        *slot = stack.clone();
+        let limit = self.limit(&stack, hooks)?;
+        stack.write().limit_size(limit);
+        hooks.changed(self).map_err(ContainerError::Callback)
+    }
+    pub fn remove<H: ContainerHooks<I, K, V>>(
+        &mut self,
+        index: i32,
+        amount: i32,
+        hooks: &mut H,
+    ) -> Result<StackRef<I, K, V>, ContainerError<H::Error>> {
+        let s = self.get(index);
+        let result = if amount > 0 && !s.read().is_empty() {
+            self.stacks.split(&s, amount)
+        } else {
+            self.stacks.empty()
+        };
+        if !result.read().is_empty() {
+            hooks.changed(self).map_err(ContainerError::Callback)?;
+        }
+        Ok(result)
+    }
+    pub fn remove_no_update<E>(
+        &mut self,
+        index: i32,
+    ) -> Result<StackRef<I, K, V>, ContainerError<E>> {
+        let slot = usize::try_from(index)
+            .ok()
+            .and_then(|i| self.items.get_mut(i))
+            .ok_or(ContainerError::Index)?;
+        if slot.read().is_empty() {
+            Ok(self.stacks.empty())
+        } else {
+            Ok(std::mem::replace(slot, self.stacks.empty()))
+        }
+    }
+    pub fn remove_type<H: ContainerHooks<I, K, V>>(
+        &mut self,
+        item: I,
+        prototype: Prototype<K, V>,
+        amount: i32,
+        hooks: &mut H,
+    ) -> Result<StackRef<I, K, V>, ContainerError<H::Error>> {
+        let result = self.stacks.create(item, 0, prototype);
+        for index in (0..self.size()).rev() {
+            let s = self.items[index].clone();
+            if s.read().item() == item {
+                let wanted = amount.wrapping_sub(result.read().count());
+                let removed = self.stacks.split(&s, wanted);
+                result.write().grow(removed.read().count());
+                if result.read().count() == amount {
+                    break;
+                }
+            }
+        }
+        if !result.read().is_empty() {
+            hooks.changed(self).map_err(ContainerError::Callback)?;
+        }
+        Ok(result)
+    }
+    pub fn clear<H: ContainerHooks<I, K, V>>(
+        &mut self,
+        hooks: &mut H,
+    ) -> Result<(), ContainerError<H::Error>> {
+        self.items.fill(self.stacks.empty());
+        hooks.changed(self).map_err(ContainerError::Callback)
+    }
+    pub fn remove_all<H: ContainerHooks<I, K, V>>(
+        &mut self,
+        hooks: &mut H,
+    ) -> ContainerResult<Vec<StackRef<I, K, V>>, H::Error> {
+        let result = self
+            .items
+            .iter()
+            .filter(|s| !s.read().is_empty())
+            .cloned()
+            .collect();
+        self.clear(hooks)?;
+        Ok(result)
+    }
+    pub fn add<H: ContainerHooks<I, K, V>>(
+        &mut self,
+        stack: &StackRef<I, K, V>,
+        hooks: &mut H,
+    ) -> Result<StackRef<I, K, V>, ContainerError<H::Error>> {
+        if stack.read().is_empty() {
+            return Ok(self.stacks.empty());
+        }
+        let remainder = self.stacks.copy(stack);
+        for index in 0..self.size() {
+            let target = self.items[index].clone();
+            if target.read().same_item_components(&remainder.read()) {
+                let limit = self.limit(&target, hooks)?;
+                let amount = remainder
+                    .read()
+                    .count()
+                    .min(limit.wrapping_sub(target.read().count()));
+                if amount > 0 {
+                    target.write().grow(amount);
+                    remainder.write().shrink(amount);
+                    hooks.changed(self).map_err(ContainerError::Callback)?;
+                }
+                if remainder.read().is_empty() {
+                    return Ok(self.stacks.empty());
+                }
+            }
+        }
+        for index in 0..self.size() {
+            if self.items[index].read().is_empty() {
+                let moved = self.stacks.resolve(remainder.write().copy_and_clear());
+                self.set(index as i32, moved, hooks)?;
+                break;
+            }
+        }
+        if remainder.read().is_empty() {
+            Ok(self.stacks.empty())
+        } else {
+            Ok(remainder)
+        }
+    }
+}

docs/collision-geometry.md

@@ -1646,3 +1646,21 @@ state, component patch order, stack identity and item/component/count equality.
 Targeted Clippy passes. The fixture arena preserves canonical EMPTY aliases;
 a production inventory, full component values/codecs and complete item-use,
 equipment and game-tick integration remain pending.
+
+
+`item_stack_refs` adds shared stack identity with automatic reference-counted
+lifetime management on the simulation thread. `simple_container` uses these
+references for get/set, merging, removals, reverse removal by type, clearing,
+capacity checks and item counts. Copies retain independent component patches;
+container slots and callers can deliberately share the same stack.
+
+`python3 tools/test_simple_container_parity.py` compares actual native container
+and stack methods, including changes and failures in virtual size/change hooks.
+The [container report](../benchmarks/rust-simple-container-2026-10-07/scoped-parity.json)
+records **590,402 matching lines per JAR**. It checks alias identity, raw/visible
+counts, empty-stack references, component-sensitive merging, overflow, invalid
+indices and mutation prefixes on failure. In particular, native insertion into
+the first empty slot clears the remainder before limiting the inserted copy.
+Targeted Clippy passes. Player inventory, menus, crafting accounting, persistence,
+arbitrary getItem/setItem overrides and complete gameplay integration remain
+pending. Reference counting here has not been benchmarked as a performance gain.

mods/horizon/src/test/java/dev/horizonlab/parity/VanillaSimpleContainerOracle.java

@@ -0,0 +1,28 @@
+package dev.horizonlab.parity;
+import com.google.gson.*;import com.mojang.serialization.Codec;import java.io.*;import java.lang.reflect.*;import java.nio.file.*;import java.util.*;
+import net.minecraft.core.component.*;import net.minecraft.world.item.*;import net.minecraft.world.SimpleContainer;
+/** Actual SimpleContainer methods over aliased ItemStack objects and bound prototypes. */
+public final class VanillaSimpleContainerOracle {
+ static final class Stop extends RuntimeException {}
+ static Item[] items;static DataComponentType<Integer>[] keys;static Field components,count,patchMap;static Object removed;
+ static Field field(Class<?> c,String n)throws Exception{var f=c.getDeclaredField(n);f.setAccessible(true);return f;}
+ static int integer(JsonObject o,String k){return o.get(k).getAsInt();}
+ static int key(Object k){for(int i=0;i<keys.length;i++)if(keys[i]==k)return i;throw new AssertionError();}
+ static int item(Item i){for(int k=0;k<items.length;k++)if(items[k]==i)return k;throw new AssertionError();}
+ static String opt(Object v){return v==null||v==removed?"none":v.toString();}
+ static DataComponentMap prototype(JsonArray a){var b=DataComponentMap.builder();for(var e:a){var p=e.getAsJsonArray();b.set(keys[p.get(0).getAsInt()],p.get(1).getAsInt());}return b.build();}
+ static DataComponentPatch patch(JsonArray a){var b=DataComponentPatch.builder();for(var e:a){var p=e.getAsJsonArray();int k=p.get(0).getAsInt();if(p.get(1).isJsonNull())b.remove(keys[k]);else b.set(keys[k],p.get(1).getAsInt());}return b.build();}
+ static final class Data {
+  PrintWriter out;ItemStack[] refs;C c;JsonObject op;int calls;IdentityHashMap<ItemStack,Integer> identities=new IdentityHashMap<>();
+  int id(ItemStack s){return identities.computeIfAbsent(s,k->identities.size());}
+  String snapshot(ItemStack s){try{var raw=(PatchedDataComponentMap)components.get(s);var p=new StringJoiner(",");for(var e:((Map<?,?>)patchMap.get(raw.asPatch())).entrySet())p.add(key(e.getKey())+"="+opt(e.getValue()));var v=new StringJoiner(",");for(var k:keys)v.add(opt(s.get(k)));return id(s)+" "+item(s.getItem())+" "+count.getInt(s)+" "+s.getCount()+" "+s.getPopTime()+" "+s.isEmpty()+" "+s.getMaxStackSize()+" | "+v+" | "+p;}catch(Exception e){throw new AssertionError(e);}}
+  void all(){for(int i=0;i<refs.length;i++)out.println("ref "+i+" "+snapshot(refs[i]));for(int i=0;i<c.getContainerSize();i++)out.println("slot "+i+" "+snapshot(c.getItems().get(i)));out.println("empty "+snapshot(ItemStack.EMPTY));out.println("container "+c.getContainerSize()+" "+c.isEmpty()+" "+c.countItem(items[0])+" "+c.countItem(items[1])+" "+c.countItem(items[2]));}
+  void event(String name){calls++;out.println("event "+name+" "+calls);all();if(calls==integer(op,"fail_at"))throw new Stop();if(calls==integer(op,"mutate_at")){refs[integer(op,"mutate_ref")].setCount(integer(op,"after_count"));refs[integer(op,"mutate_ref")].set(DataComponents.MAX_STACK_SIZE,integer(op,"after_max"));int slot=integer(op,"mutate_slot");if(slot>=0&&slot<c.getContainerSize())c.getItems().set(slot,refs[integer(op,"replace_ref")]);}}
+ }
+ static final class C extends SimpleContainer {Data d;C(ItemStack[] slots){super(slots);}@Override public void setChanged(){d.event("changed");}@Override public int getMaxStackSize(){d.event("max");return integer(d.op,"max");}}
+ @SuppressWarnings("unchecked")public static void main(String[] args)throws Exception {
+  net.minecraft.SharedConstants.tryDetectVersion();net.minecraft.server.Bootstrap.bootStrap();items=new Item[]{Items.AIR,Items.STICK,Items.SHIELD};keys=new DataComponentType[]{DataComponents.MAX_STACK_SIZE,DataComponents.DAMAGE,DataComponentType.<Integer>builder().persistent(Codec.INT).build()};components=field(ItemStack.class,"components");count=field(ItemStack.class,"count");patchMap=field(DataComponentPatch.class,"map");removed=field(Class.forName("net.minecraft.core.component.Removed"),"INSTANCE").get(null);Path dir=Path.of(args[1]);
+  try(var out=new PrintWriter(Files.newBufferedWriter(dir.resolve(args[0]+".txt")));var lines=Files.lines(dir.resolve("inputs.txt"))){for(var line:(Iterable<String>)lines::iterator){var f=JsonParser.parseString(line).getAsJsonObject();for(int i=0;i<3;i++)items[i].builtInRegistryHolder().bindComponents(prototype(f.getAsJsonArray("prototypes").get(i).getAsJsonArray()));ItemStack.EMPTY.setCount(0);ItemStack.EMPTY.setPopTime(0);((PatchedDataComponentMap)components.get(ItemStack.EMPTY)).clearPatch();var d=new Data();d.out=out;d.identities.put(ItemStack.EMPTY,0);d.refs=new ItemStack[f.getAsJsonArray("stacks").size()];for(int i=0;i<d.refs.length;i++){var v=f.getAsJsonArray("stacks").get(i).getAsJsonObject();int type=integer(v,"item");d.refs[i]=type<0?ItemStack.EMPTY:new ItemStack(items[type],integer(v,"count"));if(type>=0){d.refs[i].setPopTime(integer(v,"pop"));((PatchedDataComponentMap)components.get(d.refs[i])).restorePatch(patch(v.getAsJsonArray("patch")));}}var slots=new ItemStack[f.getAsJsonArray("slots").size()];for(int i=0;i<slots.length;i++)slots[i]=d.refs[f.getAsJsonArray("slots").get(i).getAsInt()];d.c=new C(slots);d.c.d=d;d.all();for(var ov:f.getAsJsonArray("ops")){var op=ov.getAsJsonObject();d.op=op;d.calls=0;int a=integer(op,"a"),b=integer(op,"b"),slot=integer(op,"slot"),amount=integer(op,"amount");try{switch(op.get("kind").getAsString()){
+   case "set":d.c.setItem(slot,d.refs[a]);break;case "add":d.refs[b]=d.c.addItem(d.refs[a]);break;case "remove":d.refs[b]=d.c.removeItem(slot,amount);break;case "remove-type":d.refs[b]=d.c.removeItemType(items[integer(op,"item")],amount);break;case "no-update":d.refs[b]=d.c.removeItemNoUpdate(slot);break;case "clear":d.c.clearContent();break;case "all":var result=d.c.removeAllItems();out.println("all-size "+result.size());for(var s:result)out.println("removed "+d.snapshot(s));break;case "can-add":out.println("can-add "+d.c.canAddItem(d.refs[a]));break;case "get":d.refs[b]=d.c.getItem(slot);break;case "alias":d.refs[b]=d.refs[a];break;case "copy":d.refs[b]=d.refs[a].copy();break;case "count":d.refs[a].setCount(amount);break;case "component":d.refs[a].set(keys[integer(op,"key")],op.get("value").isJsonNull()?null:integer(op,"value"));break;default:throw new AssertionError();}out.println("result ok "+d.calls);}catch(Stop|IndexOutOfBoundsException|NullPointerException e){out.println("result error "+d.calls);}d.all();}}}
+ }
+}

tools/test_simple_container_parity.py

@@ -0,0 +1,86 @@
+#!/usr/bin/env python3
+"""Compare native SimpleContainer transfers, shared stack identity and change callbacks."""
+import argparse
+import json
+import os
+from pathlib import Path
+import platform
+import subprocess
+import random
+import struct
+import math
+try:
+    from . import lab, test_rust_parity as base
+except ImportError:
+    import lab
+    import test_rust_parity as base
+
+
+def corpus():
+    kinds=['set','add','remove','remove-type','no-update','clear','all','can-add','get','alias','copy','count','component']
+    edges=[-2147483648,-1,0,1,2,63,64,65,99,100,2147483647]
+    def op(kind,**kw):
+        v=dict(kind=kind,a=0,b=3,slot=0,amount=1,item=1,max=99,fail_at=0,mutate_at=0,mutate_ref=0,after_count=2,after_max=8,mutate_slot=1,replace_ref=2,key=0,value=64);v.update(kw);return v
+    def stack(item,count):return dict(item=item,count=count,pop=7,patch=[])
+    def row(ops,slots=None,count=5):return dict(prototypes=[[],[[0,64]],[[0,1],[1,0]]],stacks=[stack(1,count),stack(1,60),stack(2,1),stack(-1,0)],slots=[1,3,3] if slots is None else slots,ops=ops)
+    for kind in kinds:
+        for count in edges:
+            for amount in edges:
+                yield row([op(kind,amount=amount),op('can-add'),op('get',slot=0),op('count',a=3,amount=3)],count=count)
+    for kind in ['set','add','remove','remove-type','no-update','get']:
+        for slot in [-2147483648,-1,0,1,2,3,2147483647]:
+            for slots in [[],[0],[0,0,0],[1,3,3]]:
+                for fail in range(1,5):
+                    for mutate in [0,1,2]:
+                        yield row([op(kind,slot=slot,fail_at=fail,mutate_at=mutate,amount=99)],slots=slots)
+    # Transfer limits differ from canAddItem; the first empty slot clears the
+    # remaining copy before setItem clamps it. Include zero/negative limits.
+    for limit in edges:
+        for size in edges:
+            for slots in [[3,3],[1,3],[1,1],[0,0]]:
+                v=row([op('can-add'),op('add',max=limit)],slots=slots,count=100)
+                v['prototypes'][1]=[[0,size]]
+                yield v
+    rng=random.Random(0x434f4e5441494e)
+    def integer():return rng.choice(edges) if rng.randrange(3) else rng.randrange(-2147483648,2147483648)
+    def patch():return [[rng.randrange(3),rng.choice([None,integer()])] for _ in range(rng.randrange(5))]
+    for _ in range(2200):
+        prototypes=[[[k,integer()] for k in rng.sample(range(3),rng.randrange(4))] for __ in range(3)]
+        stacks=[dict(item=rng.randrange(-1,3),count=integer(),pop=integer(),patch=patch()) for __ in range(4)]
+        slots=[rng.randrange(4) for __ in range(rng.choice([0,1,3,6]))]
+        ops=[op(rng.choice(kinds),a=rng.randrange(4),b=rng.randrange(4),slot=rng.randrange(-1,len(slots)+2),amount=integer(),item=rng.randrange(3),max=integer(),fail_at=rng.randrange(5),mutate_at=rng.randrange(4),mutate_ref=rng.randrange(4),after_count=integer(),after_max=integer(),mutate_slot=rng.randrange(-1,len(slots)+1),replace_ref=rng.randrange(4),key=rng.randrange(3),value=rng.choice([None,integer()])) for __ in range(16)]
+        yield dict(prototypes=prototypes,stacks=stacks,slots=slots,ops=ops)
+
+
+def main():
+    parser=argparse.ArgumentParser(description=__doc__);parser.add_argument('--prepare',action='store_true');args=parser.parse_args()
+    build=lab.LOCAL/'rust-simple-container-parity';build.mkdir(parents=True,exist_ok=True)
+    report_path=build/'report.json';report_path.unlink(missing_ok=True)
+    if args.prepare:lab.prepare()
+    lock,jars,libraries=base.verify_artifacts()
+    oracle=lab.ROOT/'mods/horizon/src/test/java/dev/horizonlab/parity/VanillaSimpleContainerOracle.java'
+    sources=[oracle,Path(__file__),lab.ROOT/'tools/test_rust_parity.py',lab.ROOT/'tools/lab.py',lab.ROOT/'Cargo.toml',lab.ROOT/'Cargo.lock',lab.ROOT/'crates/horizon-core/Cargo.toml',lab.ROOT/'crates/horizon-world/Cargo.toml',*sorted((lab.ROOT/'crates/horizon-core/src').rglob('*.rs')),*sorted((lab.ROOT/'crates/horizon-world/src').rglob('*.rs')),lab.ROOT/'crates/horizon-world/examples/simple_container_fixture.rs']
+    tested_sources=base.source_hashes(sources)
+    classes=build/'classes';classes.mkdir(exist_ok=True)
+    def run(command,name):
+        with (build/(name+'.log')).open('w',encoding='utf-8') as log:base.run(list(map(str,command)),stdout=log,stderr=subprocess.STDOUT)
+    dependency_path=os.pathsep.join(map(str,libraries))
+    run(['javac','--release',lock['minecraft']['java_major'],'-proc:none','-cp',str(jars['server'])+os.pathsep+dependency_path,'-d',classes,oracle],'compile-java')
+    def java(side,mode,path):
+        run(['java','-Xmx512M','-cp',os.pathsep.join([str(classes),str(jars[side]),dependency_path]),'dev.horizonlab.parity.VanillaSimpleContainerOracle',mode,path],side+'-'+mode)
+    fixtures=list(corpus());inputs=build/'inputs.txt';inputs.write_text(''.join(json.dumps(value,separators=(',',':'))+'\n' for value in fixtures),encoding='utf-8')
+    fixture_paths=[inputs];tested_fixtures=base.source_hashes(fixture_paths)
+    run(['cargo','build','--release','-p','horizon-world','--example','simple_container_fixture'],'compile-rust')
+    metadata=json.loads(subprocess.check_output(['cargo','metadata','--no-deps','--format-version','1'],cwd=lab.ROOT,text=True))
+    binary=Path(metadata['target_directory'])/'release/examples'/('simple_container_fixture.exe' if os.name=='nt' else 'simple_container_fixture')
+    run([binary,build],'rust');references=[]
+    for side,jar in jars.items():
+        java(side,side,build);reference=build/f'{side}.txt';matched=base.compare(reference,build/'rust.txt')
+        references.append({'side':side,'jar_sha256':lab.digest(jar,'sha256'),'output_sha256':lab.digest(reference,'sha256'),'matched_output_lines':matched})
+        print(f'{side}: {matched:,} simple container output lines match Rust',flush=True)
+    base.ensure_sources_unchanged(sources,tested_sources);base.ensure_sources_unchanged(fixture_paths,tested_fixtures)
+    report={'schema':1,'minecraft':lock['minecraft']['version'],'manifest_sha1':lock['minecraft']['manifest_sha1'],'platform':platform.platform(),'java':subprocess.check_output(['java','--version'],text=True).splitlines()[0],'rustc':subprocess.check_output(['rustc','--version'],text=True).strip(),'fixtures':len(fixtures),'sources_sha256':tested_sources,'fixtures_sha256':tested_fixtures,'rust_output_sha256':lab.digest(build/'rust.txt','sha256'),'references':references,'scope':'Actual SimpleContainer get/set/add/removal, reverse remove-by-type, clear/remove-all, can-add and count queries over real shared ItemStack storage. Small native prototypes expose component equality and copy isolation; alias identities and raw/visible state are traced. Native size/change callbacks cover mutations and failures before/after storage writes. Rust uses production reference-counted stack storage and container methods. Persistence, recipe accounting, arbitrary getItem/setItem overrides, player inventory/menu transactions, full component values and complete gameplay integration remain pending.'}
+    lab.write_json(report_path,report);print(f'Scoped simple container parity passed: {report_path}')
+
+
+if __name__=='__main__':main()