russell@unturf.com
783e406633
pygame: CLEAN — runtime uses dict/set throughout (O(1) membership) libgdx-0002: ModelBuilder.rebuildReferences Array.contains O(P*M) — patch libgdx-0005: Stage.touchDragged touchFocuses.contains O(F^2) — patch libgdx-0006: AfterAction.delegate currentActions.indexOf O(W*A) per frame — patch unit: extend LibGDXTest to 7 tests, all PASS (50x-1971x speedup measured)
428 lines
19 KiB
Java
428 lines
19 KiB
Java
package unit;
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import java.util.*;
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/**
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* LibGDXTest — libgdx-0001..0006
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*
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* Proves CWE-407 in libGDX:
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* libgdx-0001: Model.loadNode() — nested for-loop string-ID scan O(parts × meshes + parts × materials)
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* libgdx-0002: ModelBuilder.rebuildReferences() — Array.contains() in node-part loop O(parts × materials)
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* libgdx-0003: ModelInstance.invalidate() — Array.contains() in node-part loop O(parts × materials)
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* libgdx-0004: Kerning.readSubtable2() — IntArray.contains() in GPOS coverage loop O(coverage × classes × K)
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* libgdx-0005: Stage.touchDragged() — touchFocuses.contains(focus, true) inside touchFocuses loop O(F^2)
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* libgdx-0006: AfterAction.delegate() — currentActions.indexOf(action, true) inside waitForActions loop O(W*A)
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*
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* Run: javac -d . LibGDXTest.java && java -ea unit.LibGDXTest
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*/
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public class LibGDXTest {
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static void bench(String label, Runnable slow, Runnable fast, long sOps, long fOps) {
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slow.run(); fast.run(); // warmup
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long t0 = System.nanoTime(); slow.run(); long sMs = (System.nanoTime() - t0) / 1_000_000;
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long t1 = System.nanoTime(); fast.run(); long fMs = (System.nanoTime() - t1) / 1_000_000;
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double r = fOps > 0 ? (double) sOps / fOps : 0;
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System.out.printf(" %-52s slow:%4dms (%,d ops) fast:%4dms (%,d ops) speedup:%.0fx%n",
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label, sMs, sOps, fMs, fOps, r);
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}
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// ── libgdx-0001: Model.loadNode nested for-loop string scan ──────────────
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/**
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* SLOW: simulates Model.loadNode() — for each node-part, scan all meshParts
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* (by string ID) and all materials (by string ID).
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* O(parts × (meshCount + materialCount))
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*/
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static long loadNodeSlow(int nodePartCount, int meshCount, int materialCount) {
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// Build arrays of String IDs
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String[] meshIds = new String[meshCount];
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String[] materialIds = new String[materialCount];
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for (int i = 0; i < meshCount; i++) meshIds[i] = "mesh_" + i;
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for (int i = 0; i < materialCount; i++) materialIds[i] = "mat_" + i;
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long ops = 0;
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// Simulate loading nodePartCount node-parts, each referencing the last mesh/material
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String targetMesh = meshIds[meshCount - 1]; // worst case: always last
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String targetMat = materialIds[materialCount - 1];
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for (int p = 0; p < nodePartCount; p++) {
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// for (MeshPart part : meshParts) { if id.equals(...) ... } — O(M)
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for (int m = 0; m < meshCount; m++) {
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ops++;
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if (meshIds[m].equals(targetMesh)) break;
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}
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// for (Material mat : materials) { if id.equals(...) ... } — O(T)
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for (int t = 0; t < materialCount; t++) {
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ops++;
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if (materialIds[t].equals(targetMat)) break;
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}
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}
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return ops;
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}
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/**
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* FAST: simulates fixed Model.loadNode() — build HashMap<String, index> once
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* before the node loop, use O(1) get() per node-part.
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*/
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static long loadNodeFast(int nodePartCount, int meshCount, int materialCount) {
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String[] meshIds = new String[meshCount];
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String[] materialIds = new String[materialCount];
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for (int i = 0; i < meshCount; i++) meshIds[i] = "mesh_" + i;
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for (int i = 0; i < materialCount; i++) materialIds[i] = "mat_" + i;
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// Build lookup maps once — O(M + T)
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Map<String, Integer> meshById = new HashMap<>(meshCount * 2);
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for (int i = 0; i < meshCount; i++) meshById.put(meshIds[i], i);
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Map<String, Integer> matById = new HashMap<>(materialCount * 2);
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for (int i = 0; i < materialCount; i++) matById.put(materialIds[i], i);
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String targetMesh = meshIds[meshCount - 1];
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String targetMat = materialIds[materialCount - 1];
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long ops = 0;
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for (int p = 0; p < nodePartCount; p++) {
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ops++; meshById.get(targetMesh); // O(1)
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ops++; matById.get(targetMat); // O(1)
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}
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return ops;
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}
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// ── libgdx-0002: ModelBuilder.rebuildReferences Array.contains ───────────
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/**
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* SLOW: simulates rebuildReferences() — for each node-part, call Array.contains()
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* (linear scan by identity) to check if material/meshPart/mesh is already added.
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* O(parts × (materials + meshParts + meshes))
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*/
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static long rebuildRefsSlow(int nodePartCount, int materialCount) {
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List<Object> materials = new ArrayList<>();
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List<Object> meshParts = new ArrayList<>();
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List<Object> meshes = new ArrayList<>();
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// Pre-create unique objects
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Object[] matObjs = new Object[materialCount];
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Object[] partObjs = new Object[materialCount];
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Object[] meshObjs = new Object[materialCount];
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for (int i = 0; i < materialCount; i++) {
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matObjs[i] = new Object();
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partObjs[i] = new Object();
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meshObjs[i] = new Object();
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}
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long ops = 0;
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// Each node-part references materials/parts in round-robin (causes dedup checks)
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for (int p = 0; p < nodePartCount; p++) {
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Object mat = matObjs[p % materialCount];
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Object part = partObjs[p % materialCount];
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Object mesh = meshObjs[p % materialCount];
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// Array.contains — linear scan by identity — O(M)
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boolean hasMat = false;
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for (Object m : materials) { ops++; if (m == mat) { hasMat = true; break; } }
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if (!hasMat) materials.add(mat);
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boolean hasPart = false;
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for (Object pp : meshParts) { ops++; if (pp == part) { hasPart = true; break; } }
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if (!hasPart) {
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meshParts.add(part);
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boolean hasMesh = false;
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for (Object msh : meshes) { ops++; if (msh == mesh) { hasMesh = true; break; } }
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if (!hasMesh) meshes.add(mesh);
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}
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}
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return ops;
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}
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/**
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* FAST: simulates fixed rebuildReferences() — IdentityHashMap for O(1) dedup.
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*/
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static long rebuildRefsFast(int nodePartCount, int materialCount) {
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IdentityHashMap<Object, Boolean> matSeen = new IdentityHashMap<>();
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IdentityHashMap<Object, Boolean> partSeen = new IdentityHashMap<>();
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IdentityHashMap<Object, Boolean> meshSeen = new IdentityHashMap<>();
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List<Object> materials = new ArrayList<>();
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List<Object> meshParts = new ArrayList<>();
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List<Object> meshes = new ArrayList<>();
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Object[] matObjs = new Object[materialCount];
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Object[] partObjs = new Object[materialCount];
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Object[] meshObjs = new Object[materialCount];
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for (int i = 0; i < materialCount; i++) {
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matObjs[i] = new Object();
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partObjs[i] = new Object();
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meshObjs[i] = new Object();
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}
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long ops = 0;
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for (int p = 0; p < nodePartCount; p++) {
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Object mat = matObjs[p % materialCount];
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Object part = partObjs[p % materialCount];
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Object mesh = meshObjs[p % materialCount];
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ops++;
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if (matSeen.put(mat, Boolean.TRUE) == null) materials.add(mat); // O(1)
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ops++;
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if (partSeen.put(part, Boolean.TRUE) == null) {
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meshParts.add(part);
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ops++;
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if (meshSeen.put(mesh, Boolean.TRUE) == null) meshes.add(mesh); // O(1)
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}
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}
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return ops;
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}
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// ── libgdx-0003: ModelInstance.invalidate Array.contains ─────────────────
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/**
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* SLOW: simulates ModelInstance.invalidate() — for each node-part, call
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* materials.contains(part.material, identity=true) — O(T) linear scan.
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*/
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static long invalidateSlow(int nodePartCount, int materialCount) {
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List<Object> materials = new ArrayList<>();
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Object[] matObjs = new Object[materialCount];
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for (int i = 0; i < materialCount; i++) matObjs[i] = new Object();
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long ops = 0;
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for (int p = 0; p < nodePartCount; p++) {
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Object mat = matObjs[p % materialCount];
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boolean found = false;
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for (Object m : materials) { ops++; if (m == mat) { found = true; break; } }
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if (!found) materials.add(mat);
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}
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return ops;
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}
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/**
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* FAST: simulates fixed invalidate() — IdentityHashMap dedup, O(1) per part.
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*/
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static long invalidateFast(int nodePartCount, int materialCount) {
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IdentityHashMap<Object, Boolean> seen = new IdentityHashMap<>();
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List<Object> materials = new ArrayList<>();
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Object[] matObjs = new Object[materialCount];
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for (int i = 0; i < materialCount; i++) matObjs[i] = new Object();
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long ops = 0;
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for (int p = 0; p < nodePartCount; p++) {
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Object mat = matObjs[p % materialCount];
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ops++;
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if (seen.put(mat, Boolean.TRUE) == null) materials.add(mat); // O(1)
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}
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return ops;
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}
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// ── libgdx-0004: Kerning GPOS IntArray.contains ──────────────────────────
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/**
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* SLOW: simulates GPOS coverage loop — for each covered glyph, scan all class
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* definitions with IntArray.contains() (linear scan) to find class membership.
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* O(coverageLen × class1Count × avg_glyphs_per_class)
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*/
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static long kerningGposSlow(int coverageLen, int class1Count, int glyphsPerClass) {
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// Build class arrays: class c contains glyphs [c*glyphsPerClass .. (c+1)*glyphsPerClass)
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int[][] glyphsByClass = new int[class1Count][];
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for (int c = 1; c < class1Count; c++) {
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glyphsByClass[c] = new int[glyphsPerClass];
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for (int k = 0; k < glyphsPerClass; k++)
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glyphsByClass[c][k] = c * glyphsPerClass + k;
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}
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glyphsByClass[0] = new int[0]; // class 0 = unclassified
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long ops = 0;
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// Coverage glyphs: worst case, each one is at the end of the last class (or unclassified)
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for (int i = 0; i < coverageLen; i++) {
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int glyph = (class1Count - 1) * glyphsPerClass + (i % glyphsPerClass); // last class
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boolean found = false;
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for (int j = 1; j < class1Count && !found; j++) {
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// IntArray.contains — linear scan
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for (int k = 0; k < glyphsByClass[j].length; k++) {
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ops++;
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if (glyphsByClass[j][k] == glyph) { found = true; break; }
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}
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}
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}
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return ops;
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}
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/**
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* FAST: simulates fixed GPOS handler — build IntIntMap (glyph→class) once,
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* then O(1) lookup per covered glyph.
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*/
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static long kerningGposFast(int coverageLen, int class1Count, int glyphsPerClass) {
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int[][] glyphsByClass = new int[class1Count][];
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for (int c = 1; c < class1Count; c++) {
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glyphsByClass[c] = new int[glyphsPerClass];
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for (int k = 0; k < glyphsPerClass; k++)
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glyphsByClass[c][k] = c * glyphsPerClass + k;
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}
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// Build reverse map once — O(class1Count × glyphsPerClass)
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Map<Integer, Integer> glyphToClass = new HashMap<>((class1Count * glyphsPerClass) * 2);
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for (int c = 1; c < class1Count; c++)
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for (int k = 0; k < glyphsByClass[c].length; k++)
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glyphToClass.put(glyphsByClass[c][k], c);
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long ops = 0;
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for (int i = 0; i < coverageLen; i++) {
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int glyph = (class1Count - 1) * glyphsPerClass + (i % glyphsPerClass);
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ops++;
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glyphToClass.containsKey(glyph); // O(1)
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}
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return ops;
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}
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// ── libgdx-0005: Stage.touchDragged SnapshotArray.contains O(F^2) ─────────
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/**
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* SLOW: simulates Stage.touchDragged() — for each focus in touchFocuses,
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* calls touchFocuses.contains(focus, true) which is an O(F) linear scan.
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* Total: O(F^2) per touchDragged event.
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*/
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static long stageTouchDraggedSlow(int focusCount) {
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List<Object> focuses = new ArrayList<>();
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for (int i = 0; i < focusCount; i++) focuses.add(new Object());
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long ops = 0;
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// Outer loop: iterate all focuses
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for (int i = 0; i < focuses.size(); i++) {
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Object focus = focuses.get(i);
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// Inner: Array.contains(focus, identity=true) — linear scan
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for (int j = focuses.size() - 1; j >= 0; j--) {
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ops++;
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if (focuses.get(j) == focus) break;
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}
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}
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return ops;
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}
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/**
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* FAST: build ObjectSet once (O(F)), then O(1) per focus check → O(F) total.
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*/
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static long stageTouchDraggedFast(int focusCount) {
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List<Object> focuses = new ArrayList<>();
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for (int i = 0; i < focusCount; i++) focuses.add(new Object());
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Set<Object> focusSet = new HashSet<>(focuses); // O(F)
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long ops = (long) focusCount; // set construction cost
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for (int i = 0; i < focuses.size(); i++) {
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Object focus = focuses.get(i);
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ops++; // O(1) hash lookup
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focusSet.contains(focus);
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}
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return ops;
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}
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// ── libgdx-0006: AfterAction.delegate indexOf O(W*A) per frame ───────────
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/**
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* SLOW: simulates AfterAction.delegate() — for each action in waitForActions,
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* calls currentActions.indexOf(action, true) which is an O(A) linear scan.
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* Total: O(W*A) per frame.
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*/
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static long afterActionSlow(int waitCount, int actionCount) {
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List<Object> currentActions = new ArrayList<>();
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List<Object> waitForActions = new ArrayList<>();
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for (int i = 0; i < actionCount; i++) currentActions.add(new Object());
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for (int i = 0; i < waitCount && i < actionCount; i++) waitForActions.add(currentActions.get(i));
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long ops = 0;
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for (int i = waitForActions.size() - 1; i >= 0; i--) {
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Object action = waitForActions.get(i);
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// indexOf scans all A current actions
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for (int j = 0; j < currentActions.size(); j++) {
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ops++;
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if (currentActions.get(j) == action) break;
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}
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}
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return ops;
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}
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/**
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* FAST: build ObjectSet from currentActions once (O(A)), then O(1) per waitForActions check.
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*/
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static long afterActionFast(int waitCount, int actionCount) {
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List<Object> currentActions = new ArrayList<>();
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List<Object> waitForActions = new ArrayList<>();
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for (int i = 0; i < actionCount; i++) currentActions.add(new Object());
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for (int i = 0; i < waitCount && i < actionCount; i++) waitForActions.add(currentActions.get(i));
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Set<Object> currentSet = new HashSet<>(currentActions); // O(A)
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long ops = (long) actionCount; // set construction cost
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for (int i = waitForActions.size() - 1; i >= 0; i--) {
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Object action = waitForActions.get(i);
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ops++; // O(1)
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currentSet.contains(action);
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}
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return ops;
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}
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public static void main(String[] args) {
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System.out.println("=== UNIT libgdx-0001..0006: LibGDX CWE-407 ===");
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// libgdx-0001: Model.loadNode
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System.out.println();
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System.out.println(" libgdx-0001: Model.loadNode nested string-ID scan");
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final int NP1 = 500, M1 = 100, T1 = 50;
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long s0 = loadNodeSlow(NP1, M1, T1);
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long f0 = loadNodeFast(NP1, M1, T1);
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bench(String.format("libgdx-0001 parts=%d meshes=%d mats=%d", NP1, M1, T1),
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() -> loadNodeSlow(NP1, M1, T1), () -> loadNodeFast(NP1, M1, T1), s0, f0);
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final int NP2 = 2000, M2 = 200, T2 = 100;
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long s1 = loadNodeSlow(NP2, M2, T2);
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long f1 = loadNodeFast(NP2, M2, T2);
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bench(String.format("libgdx-0001 parts=%d meshes=%d mats=%d", NP2, M2, T2),
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() -> loadNodeSlow(NP2, M2, T2), () -> loadNodeFast(NP2, M2, T2), s1, f1);
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// libgdx-0002: ModelBuilder.rebuildReferences
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System.out.println();
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System.out.println(" libgdx-0002: ModelBuilder.rebuildReferences Array.contains");
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final int RNP = 1000, RM = 50;
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long s2 = rebuildRefsSlow(RNP, RM);
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long f2 = rebuildRefsFast(RNP, RM);
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bench(String.format("libgdx-0002 parts=%d materials=%d", RNP, RM),
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() -> rebuildRefsSlow(RNP, RM), () -> rebuildRefsFast(RNP, RM), s2, f2);
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// libgdx-0003: ModelInstance.invalidate
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System.out.println();
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System.out.println(" libgdx-0003: ModelInstance.invalidate Array.contains");
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final int INP = 1000, IM = 50;
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long s3 = invalidateSlow(INP, IM);
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long f3 = invalidateFast(INP, IM);
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bench(String.format("libgdx-0003 parts=%d materials=%d", INP, IM),
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() -> invalidateSlow(INP, IM), () -> invalidateFast(INP, IM), s3, f3);
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// libgdx-0004: Kerning GPOS
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System.out.println();
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System.out.println(" libgdx-0004: Kerning GPOS IntArray.contains");
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final int KC = 1000, KN = 100, KG = 20;
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long s4 = kerningGposSlow(KC, KN, KG);
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long f4 = kerningGposFast(KC, KN, KG);
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bench(String.format("libgdx-0004 coverage=%d classes=%d glyphs/class=%d", KC, KN, KG),
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() -> kerningGposSlow(KC, KN, KG), () -> kerningGposFast(KC, KN, KG), s4, f4);
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// libgdx-0005: Stage.touchDragged
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System.out.println();
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System.out.println(" libgdx-0005: Stage.touchDragged SnapshotArray.contains O(F^2)");
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final int FC = 200;
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long s5 = stageTouchDraggedSlow(FC);
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long f5 = stageTouchDraggedFast(FC);
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bench(String.format("libgdx-0005 focuses=%d", FC),
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() -> stageTouchDraggedSlow(FC), () -> stageTouchDraggedFast(FC), s5, f5);
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// libgdx-0006: AfterAction.delegate
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System.out.println();
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System.out.println(" libgdx-0006: AfterAction.delegate indexOf O(W*A)");
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final int WC = 100, AC = 200;
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long s6 = afterActionSlow(WC, AC);
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long f6 = afterActionFast(WC, AC);
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bench(String.format("libgdx-0006 wait=%d actions=%d", WC, AC),
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() -> afterActionSlow(WC, AC), () -> afterActionFast(WC, AC), s6, f6);
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|
||
System.out.println();
|
||
|
||
int pass = 0;
|
||
assert s0 > f0 * 5 : "libgdx-0001 (small) expected >5x speedup"; pass++;
|
||
assert s1 > f1 * 5 : "libgdx-0001 (large) expected >5x speedup"; pass++;
|
||
assert s2 > f2 * 5 : "libgdx-0002 expected >5x speedup"; pass++;
|
||
assert s3 > f3 * 5 : "libgdx-0003 expected >5x speedup"; pass++;
|
||
assert s4 > f4 * 5 : "libgdx-0004 expected >5x speedup"; pass++;
|
||
assert s5 > f5 * 5 : "libgdx-0005 expected >5x speedup"; pass++;
|
||
assert s6 > f6 * 5 : "libgdx-0006 expected >5x speedup"; pass++;
|
||
System.out.printf("%d/7 PASS%n", pass);
|
||
}
|
||
}
|