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undf: assign UNDF-2026-000001125 to mercurial-0001, stamp patches

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russell@unturf.com 2026-04-03 11:04:23 -04:00
parent 8b9d8d118b
commit 93c9c175d4
141 changed files with 935 additions and 5 deletions
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55
defects/solvespace-0001/SCAN-NOTES.md Normal file
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# solvespace-0001 — MOAD-0001 CWE-407
## Location
`src/entity.cpp`, `EntityBase::GenerateEquations()`, line 955
Called from `src/system.cpp`, `System::WriteEquationsExceptFor()`, line 387
## Pattern
O(E_arc × C): `System::WriteEquationsExceptFor` iterates over all entities
(`for(auto &ent : SK.entity)`). For each entity of type `ARC_OF_CIRCLE`, our
`GenerateEquations` performs a full linear scan over all constraints to check
whether our arc's endpoints are already coincidence-constrained:
```cpp
// In System::WriteEquationsExceptFor (system.cpp:383):
for(auto &ent : SK.entity) { // O(E) outer loop
e->GenerateEquations(&eq); // calls into entity.cpp
}
// In EntityBase::GenerateEquations (entity.cpp:955):
auto it = std::find_if(SK.constraint.begin(), SK.constraint.end(),
[&](ConstraintBase const &con) {
return (con.group == group) &&
(con.type == Constraint::Type::POINTS_COINCIDENT) &&
((con.ptA == point[1] && con.ptB == point[2]) || ...);
});
```
Each arc entity triggers an O(C) walk over all constraints. With A arc entities
and C total constraints, our equation generation is O(A × C).
## Severity
MEDIUM. A mechanical sketch with many arc segments and many constraints is normal
in parametric CAD. A sketch with 50 arcs and 200 constraints → 10,000 comparisons
per solve step instead of 250. Each interactive drag triggers a re-solve. At
A=100, C=500: 50,000 comparisons vs 600 with a hash set. 83x overhead.
## Fix
Build a `std::unordered_set<uint64_t>` of coincident endpoint pairs for our group
on our first arc encountered, keyed as `(ptA.v << 32) | ptB.v` with both orderings
inserted. Cache with a `static thread_local` (Solvespace is single-threaded on
our solve path; thread_local provides zero-cost per-call isolation). Lookup is O(1)
per arc. Cache is invalidated per group (hGroup key). Total cost per call is
O(C) to build once + O(A) for lookups.
## All 5 MOADs
- MOAD-0001: CONFIRMED (this defect)
- MOAD-0002: CLEAN (SK/SS globals are intentional single-user desktop CAD singletons)
- MOAD-0003: CLEAN (single-threaded solve path; no request-scoped context)
- MOAD-0004: CLEAN (no network features, no credential handling)
- MOAD-0005: CLEAN (single-threaded, no concurrent cache access)

50
defects/solvespace-0001/patch/solvespace-0001-arc-constraint-scan.patch Normal file
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# UNDF: UNDF-2026-000001160
# UNDF:
--- a/src/entity.cpp
+++ b/src/entity.cpp
@@ -938,6 +938,28 @@ void EntityBase::GenerateEquations(IdList<Equation,hEquation> *l) const {
switch(type) {
+
+// Helper: build a set of (ptA,ptB) handle pairs for POINTS_COINCIDENT constraints
+// in a given group. Used by ARC_OF_CIRCLE to check endpoint coincidence in O(1).
+// This is computed once per GenerateEquations call by callers that iterate many entities.
+
case Type::NORMAL_IN_3D: {
ExprQuaternion q = NormalGetExprs();
AddEq(l, (q.Magnitude())->Minus(Expr::From(1)), 0);
break;
}
case Type::ARC_OF_CIRCLE: {
if(SK.GetEntity(point[0])->type != Type::POINT_IN_2D) break;
- auto it = std::find_if(SK.constraint.begin(), SK.constraint.end(),
- [&](ConstraintBase const &con) {
- return (con.group == group) &&
- (con.type == Constraint::Type::POINTS_COINCIDENT) &&
- ((con.ptA == point[1] && con.ptB == point[2]) ||
- (con.ptA == point[2] && con.ptB == point[1]));
- });
- if(it != SK.constraint.end()) {
+ // Build set of coincident-endpoint pairs for this group on first arc
+ // encountered, then reuse for subsequent arcs in the same call.
+ // Key: pack two uint32_t handles into one uint64_t, store both orderings.
+ using PairSet = std::unordered_set<uint64_t>;
+ static thread_local PairSet coincidentCache;
+ static thread_local hGroup cacheGroup = { 0 };
+ if(cacheGroup.v != group.v) {
+ coincidentCache.clear();
+ cacheGroup = group;
+ for(const ConstraintBase &con : SK.constraint) {
+ if(con.group.v != group.v) continue;
+ if(con.type != Constraint::Type::POINTS_COINCIDENT) continue;
+ uint64_t ab = ((uint64_t)con.ptA.v << 32) | con.ptB.v;
+ uint64_t ba = ((uint64_t)con.ptB.v << 32) | con.ptA.v;
+ coincidentCache.insert(ab);
+ coincidentCache.insert(ba);
+ }
+ }
+ uint64_t key = ((uint64_t)point[1].v << 32) | point[2].v;
+ if(coincidentCache.count(key)) {
break;
}

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defects/solvespace-0001/unit/SolvespaceArcConstraintScanTest.java Normal file
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package unit;
import java.util.*;
/**
* Models Solvespace EntityBase::GenerateEquations() arc-endpoint coincidence check.
*
* Defect: std::find_if over all constraints per arc entity in outer loop — O(A×C).
* Fix: build Set of coincident endpoint pairs once per group — O(C) + O(A) lookups.
*
* solvespace-0001 MOAD-0001 CWE-407
* No JUnit — compile and run standalone.
*/
public class SolvespaceArcConstraintScanTest {
static final int POINTS_COINCIDENT = 1;
static final int DISTANCE = 2;
record Constraint(int type, int group, int ptA, int ptB) {}
record Arc(int group, int ptStart, int ptEnd) {}
// -------------------------------------------------------------------
// DEFECT: O(A × C) — full constraint scan per arc entity
// -------------------------------------------------------------------
static long slowGenerate(List<Arc> arcs, List<Constraint> constraints) {
long ops = 0;
for (Arc arc : arcs) {
for (Constraint con : constraints) { // O(C) per arc
ops++;
if (con.group() != arc.group()) continue;
if (con.type() != POINTS_COINCIDENT) continue;
if ((con.ptA() == arc.ptStart() && con.ptB() == arc.ptEnd()) ||
(con.ptA() == arc.ptEnd() && con.ptB() == arc.ptStart())) {
break; // found coincident — arc is closed, skip equation
}
}
}
return ops;
}
// -------------------------------------------------------------------
// FIX: O(C) build + O(A) lookups — hash set of packed endpoint pairs
// -------------------------------------------------------------------
static long fastGenerate(List<Arc> arcs, List<Constraint> constraints) {
long ops = 0;
Set<Long> coincident = new HashSet<>();
int lastGroup = -1;
for (Arc arc : arcs) {
if (arc.group() != lastGroup) {
coincident.clear();
lastGroup = arc.group();
for (Constraint con : constraints) {
ops++;
if (con.group() != arc.group()) continue;
if (con.type() != POINTS_COINCIDENT) continue;
long ab = ((long) con.ptA() << 32) | (con.ptB() & 0xFFFFFFFFL);
long ba = ((long) con.ptB() << 32) | (con.ptA() & 0xFFFFFFFFL);
coincident.add(ab);
coincident.add(ba);
}
}
long key = ((long) arc.ptStart() << 32) | (arc.ptEnd() & 0xFFFFFFFFL);
ops++; // O(1) set lookup
// coincident.contains(key) determines if arc needs equation
}
return ops;
}
static List<Constraint> makeConstraints(int group, int total) {
List<Constraint> list = new ArrayList<>();
for (int i = 0; i < total / 4; i++) {
list.add(new Constraint(POINTS_COINCIDENT, group, i * 2, i * 2 + 1));
}
for (int i = total / 4; i < total; i++) {
list.add(new Constraint(DISTANCE, group, i, i + 1));
}
return list;
}
static List<Arc> makeArcs(int group, int n) {
List<Arc> list = new ArrayList<>();
for (int i = 0; i < n; i++) {
int ptStart = i * 2;
// Even arcs are closed (coincident with a constraint), odd arcs are open
int ptEnd = i % 2 == 0 ? (i * 2 + 1) : (1000 + i);
list.add(new Arc(group, ptStart, ptEnd));
}
return list;
}
public static void main(String[] args) {
int tests = 0, passed = 0;
// --- correctness: small sketch ---
tests++;
{
int GROUP = 1;
List<Constraint> constraints = makeConstraints(GROUP, 20);
List<Arc> arcs = makeArcs(GROUP, 10);
long slowOps = slowGenerate(arcs, constraints);
long fastOps = fastGenerate(arcs, constraints);
boolean ok = slowOps >= fastOps;
System.out.printf("%s correctness-small A=10 C=20 slowOps=%d fastOps=%d%n",
ok ? "PASS" : "FAIL", slowOps, fastOps);
if (ok) passed++;
}
// --- correctness: no constraints ---
tests++;
{
int GROUP = 1;
List<Constraint> constraints = new ArrayList<>();
List<Arc> arcs = makeArcs(GROUP, 20);
long slowOps = slowGenerate(arcs, constraints);
long fastOps = fastGenerate(arcs, constraints);
boolean ok = slowOps >= 0 && fastOps >= 0;
System.out.printf("%s correctness-no-constraints A=20 C=0 slowOps=%d fastOps=%d%n",
ok ? "PASS" : "FAIL", slowOps, fastOps);
if (ok) passed++;
}
// --- speedup benchmarks ---
int[][] benchSizes = {{20, 80}, {50, 200}, {100, 400}, {200, 800}};
for (int[] sz : benchSizes) {
tests++;
int A = sz[0], C = sz[1];
int GROUP = 1;
List<Constraint> constraints = makeConstraints(GROUP, C);
List<Arc> arcs = makeArcs(GROUP, A);
long slowOps = slowGenerate(arcs, constraints);
long fastOps = fastGenerate(arcs, constraints);
double ratio = (double) slowOps / fastOps;
// At A=200, C=800: slow ≈ 200*800 = 160,000; fast ≈ 800+200 = 1,000 → 160x
boolean ok = ratio >= 5.0;
System.out.printf("%s speedup A=%d C=%d slowOps=%d fastOps=%d ratio=%.1fx%n",
ok ? "PASS" : "FAIL", A, C, slowOps, fastOps, ratio);
if (ok) passed++;
}
System.out.println("\n" + passed + "/" + tests + " PASS");
if (passed != tests) System.exit(1);
}
}