Bind player absorption and health to shared synchronized storage

benchmarks/rust-player-health-2026-10-07/scoped-parity.json

@@ -0,0 +1,255 @@
+{
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+  },
+  "fixtures_sha256": {
+    ".local/rust-player-health-parity/inputs.txt": "ae26fb76cf1034d72f15095389903074ed1c435e83291ec9cb41023663481ec0",
+    ".local/rust-player-health-parity/catalog.json": "d1e488e4f432888beb9f643904c8bca242d1e2093f53e23e07da305d70cf7106",
+    ".local/rust-player-health-parity/ids.json": "f7d6037166d966e2714b01cff5626f0cc0a02ce883885ec791c93e977afde0e6"
+  },
+  "rust_output_sha256": "546505ec6df593bc2e15ac2f28b3ee41ee0f723a537a827f982e6e34a6ad2ca0",
+  "references": [
+    {
+      "side": "client",
+      "jar_sha256": "4508d006323f24fa02876310c192d739af56516eb259000ac50f0909a68c9a2d",
+      "output_sha256": "546505ec6df593bc2e15ac2f28b3ee41ee0f723a537a827f982e6e34a6ad2ca0",
+      "matched_output_lines": 243146
+    },
+    {
+      "side": "server",
+      "jar_sha256": "a362163eec5d1612d520772bc16e5b39c09e3b234fdc045f56bf544284ee8ae6",
+      "output_sha256": "546505ec6df593bc2e15ac2f28b3ee41ee0f723a537a827f982e6e34a6ad2ca0",
+      "matched_output_lines": 243146
+    }
+  ],
+  "scope": "Actual Player health/absorption methods using registered player AttributeMap and one SynchedEntityData table. Exports actual health/absorption field IDs; compares modified attribute limits, healing, player absorption getter/setter, dirty/default extraction, received updates, callback packet drains and failures. Observer side effects are controlled; custom virtual data replacement, other synchronized serializers, wire codecs and full player damage/tick integration remain pending."
+}

crates/horizon-world/examples/player_health_fixture.rs

@@ -0,0 +1,242 @@
+use horizon_world::{
+    attributes::{
+        Modifier, Operation,
+        entity::{Catalog, EntityAttributes},
+    },
+    player_health::{PlayerAttributeHealth, PlayerFloatIds},
+    synced_floats::{FloatValue, Observer, SyncedFloats},
+};
+use serde_json::Value;
+use std::{
+    fs,
+    io::{self, Write},
+    path::Path,
+    sync::Arc,
+};
+fn single(v: &Value) -> f32 {
+    f32::from_bits(u32::from_str_radix(v.as_str().unwrap(), 16).unwrap())
+}
+fn number(v: &Value) -> f64 {
+    f64::from_bits(u64::from_str_radix(v.as_str().unwrap(), 16).unwrap())
+}
+fn bits(v: f32) -> u32 {
+    if v.is_nan() {
+        f32::NAN.to_bits()
+    } else {
+        v.to_bits()
+    }
+}
+fn values(v: Option<&[FloatValue]>) -> String {
+    match v {
+        None => "none".into(),
+        Some([]) => "empty".into(),
+        Some(v) => v
+            .iter()
+            .map(|v| format!("{}:{:08x}", v.id, bits(v.value)))
+            .collect::<Vec<_>>()
+            .join(","),
+    }
+}
+struct Callback<'a> {
+    out: &'a mut dyn Write,
+    op: &'a Value,
+    calls: i64,
+}
+impl Callback<'_> {
+    fn event(&mut self, s: &str) -> io::Result<()> {
+        writeln!(self.out, "{s}")?;
+        let n = self.calls;
+        self.calls += 1;
+        if n == self.op["fail"].as_i64().unwrap() {
+            Err(io::Error::other("injected player health callback failure"))
+        } else {
+            Ok(())
+        }
+    }
+}
+impl Observer for Callback<'_> {
+    type Error = io::Error;
+    fn updated(&mut self, data: &mut SyncedFloats, id: u8) -> io::Result<()> {
+        self.event(&format!(
+            "updated {id} {:08x} {}",
+            bits(data.get(id).unwrap()),
+            data.is_dirty()
+        ))?;
+        if self.op["pack_callback"].as_bool().unwrap() {
+            writeln!(
+                self.out,
+                "callback-pack {}",
+                values(data.take_dirty().as_deref())
+            )?;
+        }
+        Ok(())
+    }
+    fn assigned(&mut self, _: &mut SyncedFloats, v: &[FloatValue]) -> io::Result<()> {
+        self.event(&format!("assigned {}", values(Some(v))))
+    }
+}
+struct State {
+    attributes: EntityAttributes,
+    data: SyncedFloats,
+    ids: PlayerFloatIds,
+    dead: bool,
+}
+impl State {
+    fn bind<'a, 'b>(
+        &'a mut self,
+        cb: &'a mut Callback<'b>,
+    ) -> PlayerAttributeHealth<'a, Callback<'b>> {
+        PlayerAttributeHealth::new(
+            &mut self.attributes,
+            &mut self.data,
+            self.ids,
+            self.dead,
+            cb,
+        )
+        .unwrap()
+    }
+}
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let arg = std::env::args().nth(1).unwrap();
+    let dir = Path::new(&arg);
+    let ids: Value = serde_json::from_str(&fs::read_to_string(dir.join("ids.json"))?)?;
+    let ids = PlayerFloatIds {
+        health: ids["health"].as_u64().unwrap() as u8,
+        absorption: ids["absorption"].as_u64().unwrap() as u8,
+    };
+    let catalog = Arc::new(Catalog::from_json(&serde_json::from_str(
+        &fs::read_to_string(dir.join("catalog.json"))?,
+    )?)?);
+    let keys = [
+        catalog.id("minecraft:max_health").unwrap(),
+        catalog.id("minecraft:max_absorption").unwrap(),
+    ];
+    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 mut state = State {
+            attributes: catalog.create("minecraft:player").unwrap(),
+            data: SyncedFloats::new(&[
+                FloatValue {
+                    id: ids.health,
+                    value: single(&f["health"]),
+                },
+                FloatValue {
+                    id: ids.absorption,
+                    value: single(&f["absorption"]),
+                },
+            ])?,
+            ids,
+            dead: f["dead"].as_bool().unwrap(),
+        };
+        for op in f["ops"].as_array().unwrap() {
+            let mut cb = Callback {
+                out: &mut out,
+                op,
+                calls: 0,
+            };
+            let key = keys[op["attribute"].as_u64().unwrap() as usize];
+            let v = single(&op["value"]);
+            let result = match op["mode"].as_str().unwrap() {
+                "set" => state.bind(&mut cb).set_health(v).map_err(|_| ()),
+                "heal" => state.bind(&mut cb).heal(v).map_err(|_| ()),
+                "absorption" => state.bind(&mut cb).set_absorption(v).map_err(|_| ()),
+                "get-absorption" => state
+                    .bind(&mut cb)
+                    .absorption()
+                    .map_err(|_| ())
+                    .and_then(|v| writeln!(cb.out, "float {:08x}", bits(v)).map_err(|_| ())),
+                "hurt" => state
+                    .bind(&mut cb)
+                    .is_hurt()
+                    .map_err(|_| ())
+                    .and_then(|v| writeln!(cb.out, "bool {v}").map_err(|_| ())),
+                "dead" => state
+                    .bind(&mut cb)
+                    .is_dead_or_dying()
+                    .map_err(|_| ())
+                    .and_then(|v| writeln!(cb.out, "bool {v}").map_err(|_| ())),
+                "base" => {
+                    state
+                        .attributes
+                        .edit(key, |a, o| a.set_base_value(number(&op["amount"]), o))
+                        .unwrap()
+                        .unwrap();
+                    Ok(())
+                }
+                "add" => {
+                    let m = Modifier::new(
+                        op["id"].as_str().unwrap(),
+                        number(&op["amount"]),
+                        Operation::ALL[op["operation"].as_u64().unwrap() as usize],
+                    )?;
+                    state
+                        .attributes
+                        .edit(key, |a, o| a.add_or_update_transient(m, o))
+                        .unwrap()
+                        .unwrap();
+                    Ok(())
+                }
+                "remove" => {
+                    state
+                        .attributes
+                        .edit(key, |a, o| a.remove(op["id"].as_str().unwrap(), o))
+                        .unwrap()
+                        .unwrap();
+                    Ok(())
+                }
+                "reset" => {
+                    state.attributes.reset_base(key);
+                    Ok(())
+                }
+                "pack" => writeln!(
+                    cb.out,
+                    "packed {}",
+                    values(state.data.take_dirty().as_deref())
+                )
+                .map_err(|_| ()),
+                "defaults" => writeln!(
+                    cb.out,
+                    "defaults {}",
+                    values(state.data.non_default().as_deref())
+                )
+                .map_err(|_| ()),
+                "assign" => {
+                    let values = op["values"]
+                        .as_array()
+                        .unwrap()
+                        .iter()
+                        .map(|v| FloatValue {
+                            id: if v["field"] == 0 {
+                                ids.health
+                            } else {
+                                ids.absorption
+                            },
+                            value: single(&v["value"]),
+                        })
+                        .collect::<Vec<_>>();
+                    state.data.assign(&values, &mut cb).map_err(|_| ())
+                }
+                _ => panic!("mode"),
+            };
+            writeln!(
+                cb.out,
+                "result {}",
+                if result.is_ok() { "ok" } else { "error" }
+            )?;
+            writeln!(
+                cb.out,
+                "state {:08x} {:08x} {} {} {} {} {} {}",
+                bits(state.data.get(ids.health).unwrap()),
+                bits(state.data.get(ids.absorption).unwrap()),
+                state.data.is_dirty(),
+                state.data.item_dirty(ids.health).unwrap(),
+                state.data.item_dirty(ids.absorption).unwrap(),
+                state.data.is_default(ids.health).unwrap(),
+                state.data.is_default(ids.absorption).unwrap(),
+                cb.calls
+            )?;
+        }
+    }
+    Ok(())
+}

crates/horizon-world/src/lib.rs

@@ -56,6 +56,7 @@ pub mod nbt;
 pub mod piston_movement;
 pub mod piston_shape;
 pub mod player_food;
+pub mod player_health;
 pub mod player_travel;
 pub mod powder_snow_collision;
 pub mod region;

crates/horizon-world/src/player_health.rs

@@ -0,0 +1,155 @@
+//! Player absorption uses virtual synchronized-data access, unlike base living
+//! absorption field storage. Health keeps its direct synchronized-data access.
+use crate::{
+    attributes::entity::{AttributeId, EntityAttributes, LookupError},
+    compression::invalid,
+    living_health::{self, HealthWorld},
+    synced_floats::{DataError, Observer, SyncedFloats},
+};
+use std::{fmt, io};
+pub trait PlayerHealthWorld: HealthWorld {
+    fn entity_data(&mut self) -> Result<Self::Data, Self::Error>;
+    fn read_absorption(&mut self, data: Self::Data) -> Result<f32, Self::Error>;
+    fn write_absorption(&mut self, data: Self::Data, value: f32) -> Result<(), Self::Error>;
+}
+pub fn absorption<W: PlayerHealthWorld>(world: &mut W) -> Result<f32, W::Error> {
+    let data = world.entity_data()?;
+    world.read_absorption(data)
+}
+pub fn internal_set_absorption<W: PlayerHealthWorld>(
+    world: &mut W,
+    value: f32,
+) -> Result<(), W::Error> {
+    let data = world.entity_data()?;
+    world.write_absorption(data, value)
+}
+#[derive(Clone, Copy, Debug)]
+pub struct PlayerFloatIds {
+    pub health: u8,
+    pub absorption: u8,
+}
+#[derive(Debug)]
+pub enum PlayerHealthError<E> {
+    Attribute(LookupError),
+    Data(DataError<E>),
+}
+impl<E: fmt::Display> fmt::Display for PlayerHealthError<E> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::Attribute(e) => write!(f, "player health attribute lookup: {e:?}"),
+            Self::Data(e) => e.fmt(f),
+        }
+    }
+}
+impl<E: std::error::Error + 'static> std::error::Error for PlayerHealthError<E> {}
+/// Ordinary registered-player state, borrowing its actual float table. IDs come
+/// from the pinned entity-data schema; construction does not invent spawn state.
+pub struct PlayerAttributeHealth<'a, O> {
+    attributes: &'a mut EntityAttributes,
+    data: &'a mut SyncedFloats,
+    ids: PlayerFloatIds,
+    max_health: AttributeId,
+    max_absorption: AttributeId,
+    dead: bool,
+    observer: &'a mut O,
+}
+impl<'a, O: Observer> PlayerAttributeHealth<'a, O> {
+    pub fn new(
+        attributes: &'a mut EntityAttributes,
+        data: &'a mut SyncedFloats,
+        ids: PlayerFloatIds,
+        dead: bool,
+        observer: &'a mut O,
+    ) -> io::Result<Self> {
+        if ids.health == ids.absorption
+            || data.get(ids.health).is_err()
+            || data.get(ids.absorption).is_err()
+        {
+            return Err(invalid("missing or aliased player float fields"));
+        }
+        let max_health = attributes
+            .catalog()
+            .id("minecraft:max_health")
+            .ok_or_else(|| invalid("missing MAX_HEALTH definition"))?;
+        let max_absorption = attributes
+            .catalog()
+            .id("minecraft:max_absorption")
+            .ok_or_else(|| invalid("missing MAX_ABSORPTION definition"))?;
+        Ok(Self {
+            attributes,
+            data,
+            ids,
+            max_health,
+            max_absorption,
+            dead,
+            observer,
+        })
+    }
+    pub fn heal(&mut self, amount: f32) -> Result<(), PlayerHealthError<O::Error>> {
+        living_health::heal(self, amount)
+    }
+    pub fn set_health(&mut self, value: f32) -> Result<(), PlayerHealthError<O::Error>> {
+        living_health::set_health(self, value)
+    }
+    pub fn set_absorption(&mut self, value: f32) -> Result<(), PlayerHealthError<O::Error>> {
+        living_health::set_absorption(self, value)
+    }
+    pub fn absorption(&mut self) -> Result<f32, PlayerHealthError<O::Error>> {
+        absorption(self)
+    }
+    pub fn is_hurt(&mut self) -> Result<bool, PlayerHealthError<O::Error>> {
+        living_health::is_hurt(self)
+    }
+    pub fn is_dead_or_dying(&mut self) -> Result<bool, PlayerHealthError<O::Error>> {
+        living_health::is_dead_or_dying(self)
+    }
+}
+impl<O: Observer> HealthWorld for PlayerAttributeHealth<'_, O> {
+    type Error = PlayerHealthError<O::Error>;
+    type Data = ();
+    fn health(&mut self) -> Result<f32, Self::Error> {
+        self.data
+            .get(self.ids.health)
+            .map_err(|id| PlayerHealthError::Data(DataError::UnknownId(id)))
+    }
+    fn health_data(&self) {}
+    fn max_health_attribute(&mut self) -> Result<f64, Self::Error> {
+        self.attributes
+            .value(self.max_health)
+            .map_err(PlayerHealthError::Attribute)
+    }
+    fn max_absorption_attribute(&mut self) -> Result<f64, Self::Error> {
+        self.attributes
+            .value(self.max_absorption)
+            .map_err(PlayerHealthError::Attribute)
+    }
+    fn store_health(&mut self, _: (), value: f32) -> Result<(), Self::Error> {
+        self.data
+            .set(self.ids.health, value, false, self.observer)
+            .map_err(PlayerHealthError::Data)
+    }
+    fn store_absorption(&mut self, value: f32) -> Result<(), Self::Error> {
+        internal_set_absorption(self, value)
+    }
+    fn dead_flag(&self) -> bool {
+        self.dead
+    }
+    fn dispatch_set_health(&mut self, value: f32) -> Result<(), Self::Error> {
+        living_health::set_health(self, value)
+    }
+}
+impl<O: Observer> PlayerHealthWorld for PlayerAttributeHealth<'_, O> {
+    fn entity_data(&mut self) -> Result<(), Self::Error> {
+        Ok(())
+    }
+    fn read_absorption(&mut self, _: ()) -> Result<f32, Self::Error> {
+        self.data
+            .get(self.ids.absorption)
+            .map_err(|id| PlayerHealthError::Data(DataError::UnknownId(id)))
+    }
+    fn write_absorption(&mut self, _: (), value: f32) -> Result<(), Self::Error> {
+        self.data
+            .set(self.ids.absorption, value, false, self.observer)
+            .map_err(PlayerHealthError::Data)
+    }
+}

docs/collision-geometry.md

@@ -1299,3 +1299,19 @@ NaN/signed-zero equality. Native gaps are untouched default float items; observe
 keys are explicit configured IDs. Targeted Clippy passes. Other serializers,
 serializer-mismatch errors, wire codecs and player absorption binding remain
 pending.
+
+
+`player_health` binds ordinary registered player attributes to health and
+absorption in one synchronized float table. The player absorption getter and
+internal setter use virtual data access; health retains its direct data access.
+The final absorption setter still applies the registered maximum before writing.
+
+`python3 tools/test_player_health_parity.py` compares actual Player methods,
+registered player attributes and `SynchedEntityData`, exporting the actual pinned
+health/absorption field IDs. The
+[player health report](../benchmarks/rust-player-health-2026-10-07/scoped-parity.json)
+records **243,146 matching lines per JAR**, covering modified limits, healing,
+absorption reads/writes, combined dirty/default lists, received assignments,
+callback packet drains and failures. Targeted Clippy passes. Observer effects
+are controlled; custom virtual data replacement, other synchronized serializers,
+wire codecs and full player damage/tick integration remain pending.

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

@@ -0,0 +1,39 @@
+package dev.horizonlab.parity;
+import com.google.gson.*;import java.io.*;import java.lang.reflect.*;import java.nio.file.*;import java.util.*;
+import net.minecraft.core.*;import net.minecraft.core.registries.*;import net.minecraft.resources.Identifier;import net.minecraft.world.entity.*;import net.minecraft.world.entity.player.Player;import net.minecraft.world.entity.ai.attributes.*;import net.minecraft.network.syncher.*;
+/** Actual player health/absorption on one native synchronized table. */
+public final class VanillaPlayerHealthOracle {
+    static final class Stop extends RuntimeException {}
+    static EntityDataAccessor<Float> healthKey,absorptionKey;
+    static float single(JsonElement v){return Float.intBitsToFloat(Integer.parseUnsignedInt(v.getAsString(),16));}
+    static double number(JsonElement v){return Double.longBitsToDouble(Long.parseUnsignedLong(v.getAsString(),16));}
+    static String bits(float v){return String.format("%08x",Float.floatToIntBits(v));}
+    static String values(List<SynchedEntityData.DataValue<?>> values){if(values==null)return "none";var s=new StringJoiner(",");for(var v:values)s.add(v.id()+":"+bits((Float)v.value()));return s.length()==0?"empty":s.toString();}
+    static Field field(Class<?> c,String n)throws Exception{var f=c.getDeclaredField(n);f.setAccessible(true);return f;}
+    static final class Data {JsonObject op;PrintWriter out;AttributeMap attributes;SynchedEntityData data;int calls;
+        void event(String s){out.println(s);if(calls++==op.get("fail").getAsInt())throw new Stop();}}
+    static final class Actor extends Player {Data d;Actor(){super(null,null);}@Override public net.minecraft.world.level.GameType gameMode(){return net.minecraft.world.level.GameType.SURVIVAL;}
+        @Override public double getAttributeValue(Holder<Attribute> a){return d.attributes.getValue(a);}
+        @Override public void onSyncedDataUpdated(EntityDataAccessor<?> a){var key=a.id()==healthKey.id()?healthKey:absorptionKey;d.event("updated "+key.id()+" "+bits(d.data.get(key))+" "+d.data.isDirty());if(d.op.get("pack_callback").getAsBoolean())d.out.println("callback-pack "+values(d.data.packDirty()));}
+        @Override public void onSyncedDataUpdated(List<SynchedEntityData.DataValue<?>> v){d.event("assigned "+values(v));}
+    }
+    @SuppressWarnings("unchecked") public static void main(String[] args)throws Exception {
+        Path dir=Path.of(args[1]);if(args[0].equals("export"))VanillaEntityAttributeOracle.main(args);else{net.minecraft.SharedConstants.tryDetectVersion();net.minecraft.server.Bootstrap.bootStrap();}
+        healthKey=(EntityDataAccessor<Float>)field(LivingEntity.class,"DATA_HEALTH_ID").get(null);absorptionKey=(EntityDataAccessor<Float>)field(Player.class,"DATA_PLAYER_ABSORPTION_ID").get(null);if(args[0].equals("export")){var ids=new JsonObject();ids.addProperty("health",healthKey.id());ids.addProperty("absorption",absorptionKey.id());Files.writeString(dir.resolve("ids.json"),ids.toString());return;}
+        var u=Class.forName("sun.misc.Unsafe");var uf=u.getDeclaredField("theUnsafe");uf.setAccessible(true);var unsafe=uf.get(null);var allocate=u.getMethod("allocateInstance",Class.class);var ctor=SynchedEntityData.class.getDeclaredConstructor(SyncedDataHolder.class,SynchedEntityData.DataItem[].class);ctor.setAccessible(true);var storage=field(Entity.class,"entityData");var dead=field(LivingEntity.class,"dead");var keys=List.of(Attributes.MAX_HEALTH,Attributes.MAX_ABSORPTION);
+        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();var d=new Data();d.out=out;d.attributes=new AttributeMap(VanillaEntityAttributeOracle.supplier(BuiltInRegistries.ENTITY_TYPE.getValue(Identifier.parse("minecraft:player"))));var actor=(Actor)allocate.invoke(unsafe,Actor.class);actor.d=d;
+            var items=new SynchedEntityData.DataItem<?>[Math.max(healthKey.id(),absorptionKey.id())+1];for(int i=0;i<items.length;i++)items[i]=new SynchedEntityData.DataItem<Float>(new EntityDataAccessor<Float>(i,EntityDataSerializers.FLOAT),0f);var health=new SynchedEntityData.DataItem<Float>(healthKey,single(f.get("health")));var absorption=new SynchedEntityData.DataItem<Float>(absorptionKey,single(f.get("absorption")));items[healthKey.id()]=health;items[absorptionKey.id()]=absorption;d.data=ctor.newInstance(actor,items);storage.set(actor,d.data);dead.setBoolean(actor,f.get("dead").getAsBoolean());
+            for(var ov:f.getAsJsonArray("ops")){var op=ov.getAsJsonObject();d.op=op;d.calls=0;var key=keys.get(op.get("attribute").getAsInt());float v=single(op.get("value"));try{switch(op.get("mode").getAsString()){
+                case "set":actor.setHealth(v);break;case "heal":actor.heal(v);break;case "absorption":actor.setAbsorptionAmount(v);break;case "get-absorption":out.println("float "+bits(actor.getAbsorptionAmount()));break;
+                case "hurt":out.println("bool "+actor.isHurt());break;case "dead":out.println("bool "+actor.isDeadOrDying());break;
+                case "base":d.attributes.getInstance(key).setBaseValue(number(op.get("amount")));break;
+                case "add":d.attributes.getInstance(key).addOrUpdateTransientModifier(new AttributeModifier(Identifier.parse(op.get("id").getAsString()),number(op.get("amount")),AttributeModifier.Operation.values()[op.get("operation").getAsInt()]));break;
+                case "remove":d.attributes.getInstance(key).removeModifier(Identifier.parse(op.get("id").getAsString()));break;case "reset":d.attributes.resetBaseValue(key);break;
+                case "pack":out.println("packed "+values(d.data.packDirty()));break;case "defaults":out.println("defaults "+values(d.data.getNonDefaultValues()));break;
+                case "assign":{var data=new ArrayList<SynchedEntityData.DataValue<?>>();for(var x:op.getAsJsonArray("values")){var e=x.getAsJsonObject();data.add(new SynchedEntityData.DataValue<Float>(e.get("field").getAsInt()==0?healthKey.id():absorptionKey.id(),EntityDataSerializers.FLOAT,single(e.get("value"))));}d.data.assignValues(data);break;}
+                default:throw new AssertionError();}out.println("result ok");}catch(Stop e){out.println("result error");}
+                out.println("state "+bits(health.getValue())+" "+bits(absorption.getValue())+" "+d.data.isDirty()+" "+health.isDirty()+" "+absorption.isDirty()+" "+health.isSetToDefault()+" "+absorption.isSetToDefault()+" "+d.calls);
+            }
+        }}
+    }
+}

tools/test_player_health_parity.py

@@ -0,0 +1,74 @@
+#!/usr/bin/env python3
+"""Compare registered player health and synchronized absorption with vanilla."""
+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(catalog):
+    def bits(v):return struct.pack('>f',v).hex()
+    def double(v):return struct.pack('>d',v).hex()
+    def op(mode,value=0,**kw):
+        o=dict(mode=mode,value=bits(value),amount=double(0),attribute=0,id='horizon:a',operation=0,values=[],fail=-1,pack_callback=False);o.update(kw);return o
+    def row(health,absorption,ops,dead=False):return dict(health=bits(health),absorption=bits(absorption),ops=ops,dead=dead)
+    values=[-float('inf'),-1e30,-1,-0.,0.,1e-40,.1,1,5,10,20,1e30,float('inf'),float('nan')]
+    for start in values:
+        for maximum in values:
+            for value in values:
+                yield row(start,start,[op('base',amount=double(maximum)),op('base',attribute=1,amount=double(maximum)),op('set',value),op('absorption',value),op('get-absorption'),op('hurt'),op('dead'),op('pack'),op('heal',value),op('defaults'),op('pack')])
+    for fail in range(-1,6):
+        for pack in [False,True]:
+            ops=[op('base',attribute=1,amount=double(20)),op('set',9),op('absorption',5),op('pack'),op('set',1),op('assign',values=[dict(field=0,value=bits(20)),dict(field=1,value=bits(7)),dict(field=0,value=bits(10))]),op('pack')]
+            yield row(1,0,[dict(o,fail=fail,pack_callback=pack) for o in ops])
+    rng=random.Random(0x504c415945524850)
+    for _ in range(1500):
+        ops=[]
+        for __ in range(rng.randrange(5,70)):
+            ops.append(op(rng.choice(['set','heal','absorption','get-absorption','hurt','dead','base','add','remove','reset','pack','defaults','assign']),rng.choice(values),attribute=rng.randrange(2),amount=double(rng.choice(values)),operation=rng.randrange(3),id=rng.choice(['horizon:a','horizon:b']),values=[dict(field=rng.randrange(2),value=bits(rng.choice(values))) for ___ in range(rng.randrange(5))],fail=rng.choice([-1,-1,-1,0,1,2]),pack_callback=bool(rng.randrange(2))))
+        yield row(rng.choice(values),rng.choice(values),ops,bool(rng.randrange(2)))
+
+
+def main():
+    parser=argparse.ArgumentParser(description=__doc__);parser.add_argument('--prepare',action='store_true');args=parser.parse_args()
+    build=lab.LOCAL/'rust-player-health-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/VanillaPlayerHealthOracle.java'
+    helper=lab.ROOT/'mods/horizon/src/test/java/dev/horizonlab/parity/VanillaEntityAttributeOracle.java'
+    sources=[oracle,helper,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/player_health_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,helper],'compile-java')
+    def java(side,mode,path):
+        run(['java','-Xmx512M','-cp',os.pathsep.join([str(classes),str(jars[side]),dependency_path]),'dev.horizonlab.parity.VanillaPlayerHealthOracle',mode,path],side+'-'+mode)
+    java('server','export',build);states=json.loads((build/'catalog.json').read_text());fixtures=list(corpus(states));inputs=build/'inputs.txt';inputs.write_text(''.join(json.dumps(value,separators=(',',':'))+'\n' for value in fixtures),encoding='utf-8')
+    fixture_paths=[inputs,build/'catalog.json',build/'ids.json'];tested_fixtures=base.source_hashes(fixture_paths)
+    run(['cargo','build','--release','-p','horizon-world','--example','player_health_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'/('player_health_fixture.exe' if os.name=='nt' else 'player_health_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:,} player health 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 Player health/absorption methods using registered player AttributeMap and one SynchedEntityData table. Exports actual health/absorption field IDs; compares modified attribute limits, healing, player absorption getter/setter, dirty/default extraction, received updates, callback packet drains and failures. Observer side effects are controlled; custom virtual data replacement, other synchronized serializers, wire codecs and full player damage/tick integration remain pending.'}
+    lab.write_json(report_path,report);print(f'Scoped player health parity passed: {report_path}')
+
+
+if __name__=='__main__':main()