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java-topology/defects/mybatis/patch/mybatis-diamond-recursion-CLEAN.md
russell@unturf.com 3986d8dc50 diamond hunt: godot-0009/0010 + meson-0002 + typeorm-0004/0005 + ts-0003; count 629→635 
New diamond recursion defects (O(2^D) → O(N)):
- godot-0009: Font::_is_cyclic no visited set — CJK fallback diamond, 2648x at F=4,D=8
- godot-0010: Font::_update_rids_fb no visited set — duplicate RIDs + O(N^2) hot path
- meson-0002: get_internal_static_libraries_recurse link_whole guard missing — 132x at D=10
- typescript-0003: hasBaseType inner check() no visited set — 1024x at D=10; hot on instanceof

New O(N²) defects:
- typeorm-0004: SubjectTopologicalSorter Array.indexOf dedup — 200x at N=400
- typeorm-0005: DepGraph.createDFS result.indexOf + addDependency edge dedup — 300x at N=600

CLEAN confirmed (diamond recursion sweep): bazel, cargo, cmake, composer, dgl, diesel,
doctrine-orm, efcore, helm, mybatis, networkx-deeper, ninja, npm-arborist, peewee, pip,
rubygems, seaorm, sqlalchemy, swift

UNDF: 571→578 assigned; MOAD count: 629→635
2026-03-29 16:52:04 -04:00

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mybatis-3 diamond recursion scan — CLEAN

Scanned: 2026-03-29 Scope: diamond recursion / CWE-407 in ORM dependency graph traversal

Files checked

  • src/main/java/org/apache/ibatis/session/ — no graph traversal with cycle risk.
  • src/main/java/org/apache/ibatis/parsing/ — XML parsing, no graph topology.
  • src/main/java/org/apache/ibatis/executor/resultset/DefaultResultSetHandler.java — uses Set/Map.containsKey() for O(1) lookups in result mapping.
  • src/main/java/org/apache/ibatis/cache/decorators/ — FIFO/LRU cycle is a ring buffer rotation, not a graph cycle detection problem.

Verdict

CLEAN. MyBatis has no graph dependency ordering code in the migration/schema tool category. Result set mapping uses proper Set-based dedup.