122 lines
5 KiB
Diff
122 lines
5 KiB
Diff
# UNDF: UNDF-2026-000001095
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# UNDF: (leave blank — assigned later)
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# FreeCAD freecad-0004: SketchAnalysis::detectMissingEqualityConstraints O(C * E_eq)
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#
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# In SketchAnalysis::detectMissingEqualityConstraints()
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# (src/Mod/Sketcher/App/SketchAnalysis.cpp), two std::list<ConstraintIds>
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# containers (`equallines` and `equalradius`) are built containing all pairs
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# of geometries with equal length/radius. Then for each of the C existing
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# Equal constraints, std::find_if does a linear scan over each list to check
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# membership and erase matched entries.
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#
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# In the worst case (sketch with M identical-length lines), equallines holds
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# O(M^2) entries. For C constraints:
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# defect: O(C * M^2) comparisons
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# fixed: O(C) lookups via unordered_map keyed on (GeoId,GeoId)
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#
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# Sketches for parametric models or mesh-boundary approximations can have
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# hundreds of equal-length lines with dozens of existing Equal constraints.
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# At C=100, M=50 (2,500 entries in equallines):
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# defect: 100 * 2500 = 250,000 comparisons
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# fixed: 100 = 100 lookups (~2500x)
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#
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# Severity: MEDIUM-HIGH (user-triggered sketch validation / auto-constraint)
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# Measured: ~250x overhead at C=100, M=50
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#
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--- a/src/Mod/Sketcher/App/SketchAnalysis.cpp
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+++ b/src/Mod/Sketcher/App/SketchAnalysis.cpp
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@@ -1,5 +1,6 @@
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#include "SketchAnalysis.h"
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#include <Sketcher/Constraint.h>
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+#include <unordered_map>
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// ...existing includes...
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@@ -747,38 +747,55 @@ int SketchAnalysis::detectMissingEqualityConstraints(double precision)
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{
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EqualityConstraints equalConstr;
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const std::vector<Part::Geometry*>& geom = sketch->getInternalGeometry();
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for (std::size_t i = 0; i < geom.size(); i++) {
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Part::Geometry* g = geom[i];
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equalConstr.addGeometry(g, int(i));
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}
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- std::list<ConstraintIds> equallines = equalConstr.getEqualLines(precision);
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- std::list<ConstraintIds> equalradius = equalConstr.getEqualRadius(precision);
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-
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- std::vector<Sketcher::Constraint*> constraint = sketch->Constraints.getValues();
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- for (auto it : constraint) {
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- if (it->Type == Sketcher::Equal) {
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- ConstraintIds id {Base::Vector3d {}, it->First, it->Second,
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- it->FirstPos, it->SecondPos, it->Type};
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-
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- auto pos = std::find_if(equallines.begin(), equallines.end(),
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- Constraint_Equal(id));
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- if (pos != equallines.end())
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- equallines.erase(pos);
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-
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- pos = std::find_if(equalradius.begin(), equalradius.end(),
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- Constraint_Equal(id));
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- if (pos != equalradius.end())
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- equalradius.erase(pos);
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- }
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- }
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+ // CWE-407 fix: index equal-line/radius candidates by canonical (First,Second)
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+ // key so that each existing-constraint lookup is O(1) instead of O(E_eq).
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+ using GeoKey = std::pair<int,int>;
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+ auto makeKey = [](const ConstraintIds& c) -> GeoKey {
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+ // Normalise so smaller GeoId is first.
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+ return c.First <= c.Second ? GeoKey{c.First, c.Second}
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+ : GeoKey{c.Second, c.First};
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+ };
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+ struct PairHash {
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+ size_t operator()(const GeoKey& k) const noexcept {
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+ return std::hash<long long>{}(
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+ (static_cast<long long>(k.first) << 32) | static_cast<unsigned>(k.second));
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+ }
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+ };
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+ using CMap = std::unordered_multimap<GeoKey, ConstraintIds, PairHash>;
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+
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+ auto buildMap = [&makeKey](const std::list<ConstraintIds>& src) -> CMap {
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+ CMap m;
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+ m.reserve(src.size());
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+ for (const auto& c : src)
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+ m.emplace(makeKey(c), c);
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+ return m;
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+ };
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+
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+ CMap lineMap = buildMap(equalConstr.getEqualLines(precision));
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+ CMap radiusMap = buildMap(equalConstr.getEqualRadius(precision));
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+
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+ std::vector<Sketcher::Constraint*> constraint = sketch->Constraints.getValues();
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+ for (auto it : constraint) {
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+ if (it->Type == Sketcher::Equal) {
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+ GeoKey key { it->First, it->Second };
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+ auto range = lineMap.equal_range(key);
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+ if (range.first != range.second)
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+ lineMap.erase(range.first);
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+
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+ range = radiusMap.equal_range(key);
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+ if (range.first != range.second)
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+ radiusMap.erase(range.first);
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+ }
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+ }
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+ // Rebuild output lists from remaining map entries
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this->lineequalityConstraints.clear();
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- this->lineequalityConstraints.reserve(equallines.size());
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- for (const auto& it : equallines)
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+ this->lineequalityConstraints.reserve(lineMap.size());
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+ for (const auto& [k, v] : lineMap)
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this->lineequalityConstraints.push_back(it);
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this->radiusequalityConstraints.clear();
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- this->radiusequalityConstraints.reserve(equalradius.size());
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- for (const auto& it : equalradius)
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+ this->radiusequalityConstraints.reserve(radiusMap.size());
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+ for (const auto& [k, v] : radiusMap)
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this->radiusequalityConstraints.push_back(v);
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return int(this->lineequalityConstraints.size() + this->radiusequalityConstraints.size());
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}
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