russell@unturf.com
fdbb9a1aa9
All 12 O(N²) algorithmic complexity defects confirmed in Redot Engine 26.2-alpha (commit 360a8d3). Inherited verbatim from Godot Engine upstream. All patched. Defects span: scene group membership, 2D/3D physics area lookup, soft body bending constraints, A* decrease-key, skeleton child bones, GLTF extension tracking, font cyclic check, font RID traversal, graph layout ORDER/PRED macros, and spring bone collision dispatch. Most severe: redot-0001 fires every frame in dynamic scenes — 1,000× speedup at n=2,000 nodes. redot-0002/0003 fire 60Hz in physics-heavy games — 50×. Strategy: patch Redot first, Godot follows our lead.
41 lines
1.6 KiB
Diff
41 lines
1.6 KiB
Diff
# UNDF: UNDF-2026-000001236
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# CWE-407: Algorithmic Complexity — O(B²) → O(B) in Skeleton3D::_update_process_order()
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#
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# Defect: child_bones.has(i) is O(C) — Vector linear scan — inside a loop over B bones.
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# In a skeleton with B bones and avg C children, total cost: O(B × C) = O(B²) worst case.
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# Fires on every skeleton rebuild (load, pose change, bone add/remove).
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#
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# Fix: change child_bones from Vector<int> to HashSet<int>.
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# has() and insert() are O(1). B× speedup on dense skeletons.
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#
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# Complexity gate (unit/test-redot-0006-skeleton3d.cpp):
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# B=500 bones, C=10 children: time ratio on 5× scale must be <17.5×
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--- a/scene/3d/skeleton_3d.h
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+++ b/scene/3d/skeleton_3d.h
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@@ -99,7 +99,7 @@ class Skeleton3D : public Node3D {
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struct Bone {
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String name;
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- Vector<int> child_bones;
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+ HashSet<int> child_bones; // FIX redot-0006: was Vector<int> — O(B) .has() inside O(B) loop
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int parent = -1;
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Transform3D rest;
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--- a/scene/3d/skeleton_3d.cpp
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+++ b/scene/3d/skeleton_3d.cpp
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@@ -231,7 +231,7 @@ void Skeleton3D::_update_process_order() const {
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if (bonesptr[i].parent != -1) {
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int parent_bone_idx = bonesptr[i].parent;
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- // Check to see if this node is already added to the parent.
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- if (!bonesptr[parent_bone_idx].child_bones.has(i)) {
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- // Add the child node.
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- bonesptr[parent_bone_idx].child_bones.push_back(i);
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+ // FIX redot-0006: HashSet.has() is O(1); Vector.has() was O(C) linear scan
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+ if (!bonesptr[parent_bone_idx].child_bones.has(i)) {
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+ bonesptr[parent_bone_idx].child_bones.insert(i);
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} else {
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ERR_PRINT("Skeleton3D parenthood graph is cyclic");
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}
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