perf: stop heap-allocating mob restriction state and Path nodes

Inlines restrictCenter and leashRestrictionGoal as value members and
stores Path nodes by value, removing per-mob and per-path malloc churn.

targets/minecraft/world/entity/PathfinderMob.cpp

@@ -26,25 +26,20 @@ AttributeModifier* PathfinderMob::SPEED_MODIFIER_FLEEING =
                            AttributeModifier::OPERATION_MULTIPLY_TOTAL))
         ->setSerialize(false);
 
-PathfinderMob::PathfinderMob(Level* level) : Mob(level) {
-    path = nullptr;
-    attackTarget = nullptr;
-    holdGround = false;
-    fleeTime = 0;
-
-    restrictRadius = -1;
-    restrictCenter = new Pos(0, 0, 0);
-    addedLeashRestrictionGoal = false;
-    leashRestrictionGoal = new MoveTowardsRestrictionGoal(this, 1.0f);
-}
+PathfinderMob::PathfinderMob(Level* level)
+    : Mob(level),
+      path(nullptr),
+      attackTarget(nullptr),
+      holdGround(false),
+      fleeTime(0),
+      restrictCenter(0, 0, 0),
+      restrictRadius(-1),
+      leashRestrictionGoal(this, 1.0f),
+      addedLeashRestrictionGoal(false) {}
 
 bool PathfinderMob::shouldHoldGround() { return false; }
 
-PathfinderMob::~PathfinderMob() {
-    delete path;
-    delete restrictCenter;
-    delete leashRestrictionGoal;
-}
+PathfinderMob::~PathfinderMob() { delete path; }
 
 void PathfinderMob::serverAiStep() {
     if (fleeTime > 0) {
@@ -264,15 +259,15 @@ bool PathfinderMob::isWithinRestriction() {
 
 bool PathfinderMob::isWithinRestriction(int x, int y, int z) {
     if (restrictRadius == -1) return true;
-    return restrictCenter->distSqr(x, y, z) < restrictRadius * restrictRadius;
+    return restrictCenter.distSqr(x, y, z) < restrictRadius * restrictRadius;
 }
 
 void PathfinderMob::restrictTo(int x, int y, int z, int radius) {
-    restrictCenter->set(x, y, z);
+    restrictCenter.set(x, y, z);
     restrictRadius = radius;
 }
 
-Pos* PathfinderMob::getRestrictCenter() { return restrictCenter; }
+Pos* PathfinderMob::getRestrictCenter() { return &restrictCenter; }
 
 float PathfinderMob::getRestrictRadius() { return restrictRadius; }
 
@@ -305,7 +300,7 @@ void PathfinderMob::tickLeash() {
         }
 
         if (!addedLeashRestrictionGoal) {
-            goalSelector.addGoal(2, leashRestrictionGoal, false);
+            goalSelector.addGoal(2, &leashRestrictionGoal, false);
             getNavigation()->setAvoidWater(false);
             addedLeashRestrictionGoal = true;
         }
@@ -332,7 +327,7 @@ void PathfinderMob::tickLeash() {
 
     } else if (!isLeashed() && addedLeashRestrictionGoal) {
         addedLeashRestrictionGoal = false;
-        goalSelector.removeGoal(leashRestrictionGoal);
+        goalSelector.removeGoal(&leashRestrictionGoal);
         getNavigation()->setAvoidWater(true);
         clearRestriction();
     }

targets/minecraft/world/entity/PathfinderMob.h

@@ -3,14 +3,14 @@
 #include <memory>
 
 #include "Mob.h"
+#include "minecraft/Pos.h"
 #include "minecraft/world/entity/Entity.h"
 #include "minecraft/world/entity/Mob.h"
+#include "minecraft/world/entity/ai/goal/MoveTowardsRestrictionGoal.h"
 
 class Level;
 class Path;
 class AttributeModifier;
-class Goal;
-class Pos;
 
 class PathfinderMob : public Mob {
 public:
@@ -32,9 +32,9 @@ protected:
     int fleeTime;
 
 private:
-    Pos* restrictCenter;
+    Pos restrictCenter;
     float restrictRadius;
-    Goal* leashRestrictionGoal;
+    MoveTowardsRestrictionGoal leashRestrictionGoal;
     bool addedLeashRestrictionGoal;
 
 protected:

targets/minecraft/world/level/pathfinder/Node.h

@@ -11,10 +11,10 @@ class Node {
     friend class EnderDragon;
 
 public:
-    const int x, y, z;
+    int x, y, z;
 
 private:
-    const int hash;
+    int hash;
 
 protected:
     int heapIdx;

targets/minecraft/world/level/pathfinder/Path.cpp

@@ -1,31 +1,12 @@
 #include "Path.h"
 
-#include <string.h>
-
 #include "minecraft/world/entity/Entity.h"
 #include "minecraft/world/level/pathfinder/Node.h"
 #include "minecraft/world/phys/Vec3.h"
 
-Path::~Path() {
-    for (size_t i = 0; i < nodes.size(); i++) delete nodes[i];
-}
-
-Path::Path(std::vector<Node*>& nodes) {
-    index = 0;
-
-    length = nodes.size();
-    // 4J - copying these nodes over from a std::vector<Node*> (which is an
-    // array of Node
-    // * references) to just a straight array of Nodes, so that this Path is no
-    // longer dependent of Nodes allocated elsewhere and can handle its own
-    // destruction Note: cameFrom pointer will be useless now but that isn't
-    // used once this is just a path
-    this->nodes = std::vector<Node*>(length);
-
-    for (int i = 0; i < length; i++) {
-        this->nodes[i] = new Node();
-        memcpy(this->nodes[i], nodes[i], sizeof(Node));
-    }
+Path::Path(std::vector<Node*>& src)
+    : nodes(src.size()), index(0), length(static_cast<int>(src.size())) {
+    for (int i = 0; i < length; i++) nodes[i] = *src[i];
 }
 
 void Path::next() { index++; }
@@ -34,12 +15,12 @@ bool Path::isDone() { return index >= length; }
 
 Node* Path::last() {
     if (length > 0) {
-        return nodes[length - 1];
+        return &nodes[length - 1];
     }
     return nullptr;
 }
 
-Node* Path::get(int i) { return nodes[i]; }
+Node* Path::get(int i) { return &nodes[i]; }
 
 int Path::getSize() { return length; }
 
@@ -50,25 +31,25 @@ int Path::getIndex() { return index; }
 void Path::setIndex(int index) { this->index = index; }
 
 Vec3 Path::getPos(std::shared_ptr<Entity> e, int index) {
-    double x = nodes[index]->x + (int)(e->bbWidth + 1) * 0.5;
-    double y = nodes[index]->y;
-    double z = nodes[index]->z + (int)(e->bbWidth + 1) * 0.5;
+    double x = nodes[index].x + (int)(e->bbWidth + 1) * 0.5;
+    double y = nodes[index].y;
+    double z = nodes[index].z + (int)(e->bbWidth + 1) * 0.5;
     return Vec3(x, y, z);
 }
 
 Vec3 Path::currentPos(std::shared_ptr<Entity> e) { return getPos(e, index); }
 
 Vec3 Path::currentPos() {
-    return Vec3(nodes[index]->x, nodes[index]->y, nodes[index]->z);
+    return Vec3(nodes[index].x, nodes[index].y, nodes[index].z);
 }
 
 bool Path::sameAs(Path* path) {
     if (path == nullptr) return false;
     if (path->nodes.size() != nodes.size()) return false;
-    for (int i = 0; i < nodes.size(); ++i)
-        if (nodes[i]->x != path->nodes[i]->x ||
-            nodes[i]->y != path->nodes[i]->y ||
-            nodes[i]->z != path->nodes[i]->z)
+    for (size_t i = 0; i < nodes.size(); ++i)
+        if (nodes[i].x != path->nodes[i].x ||
+            nodes[i].y != path->nodes[i].y ||
+            nodes[i].z != path->nodes[i].z)
             return false;
     return true;
 }

targets/minecraft/world/level/pathfinder/Path.h

@@ -13,13 +13,16 @@ class Path {
     friend class PathFinder;
 
 private:
-    std::vector<Node*> nodes;
+    // Nodes are stored by value. The vector is sized once in the constructor
+    // and never resized, so Node* returned by get()/last() remain valid for
+    // the lifetime of the Path.
+    std::vector<Node> nodes;
     int index;
     int length;
 
 public:
     Path(std::vector<Node*>& nodes);
-    ~Path();
+    ~Path() = default;
 
     void next();
     bool isDone();
@@ -30,7 +33,6 @@ public:
     int getIndex();
     void setIndex(int index);
     Vec3 getPos(std::shared_ptr<Entity> e, int index);
-    std::vector<Node*> Getarray();
     Vec3 currentPos(std::shared_ptr<Entity> e);
     Vec3 currentPos();
     bool sameAs(Path* path);