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# Subsystem notes
Deep-dives on the CodeGen helper subsystems, split by topic under `SUBSYSTEMS/`.
(Invariants: [CONVENTIONS.md](CONVENTIONS.md); known bugs: [PITFALLS.md](PITFALLS.md).)
- [Arrays](SUBSYSTEMS/ARRAYS.md): `ArrayHandler` storage, checked indexing, array
parameters and array OUTPUT.
- [Functions and operator overloads](SUBSYSTEMS/FUNCTIONS.md): `FunctionGen`
prototypes, parameter modes, OVERLOAD resolution, `OperatorGen`.
- [EXTERN "C" and INCLUDE_OBJ](SUBSYSTEMS/EXTERN.md): external prototypes, variadic
calls, driver object-symbol handling.
- [User types](SUBSYSTEMS/USER_TYPES.md): `TypeSystem`, two-pass TYPE registration,
lvalues, admission, enum ordinals.
- [Classes](SUBSYSTEMS/CLASSES.md): CLASS declarations, field access, methods, `this`,
member calls.
- [Class construction, destruction and copies](SUBSYSTEMS/CLASS_LIFETIME.md):
`ConstructorGen`, DELETE, stack-object ownership, BYVAL copies, temporaries.
- [Runtime checks and exceptions](SUBSYSTEMS/RUNTIME_CHECKS_EXCEPTIONS.md):
`RuntimeCheck`, TRY/CATCH/THROW lowering, cleanup pads, EH runtime per platform.
- [Files](SUBSYSTEMS/FILES.md): `FileHandler` text-file runtime and open-file table.
- [Explicit memory](SUBSYSTEMS/MEMORY.md): standard-library MALLOC/REALLOC/FREE,
allocation tracking and keyword NEW/DELETE bridging.
- [Standard library](SUBSYSTEMS/STDLIB.md): `pseudocode-lib/`, embedding, STRING class.
- [Templates](SUBSYSTEMS/TEMPLATES.md): template declarations, resolution, cloning,
instantiation, body emission.
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