# src/

Hosted StarForth VM implementation (compiled by the root `Makefile`).
Bare-metal kernel sources live in `src/starkernel/`; FORTH word
implementations in `src/word_source/`; the test harness in
`src/test_runner/`; platform shims in `src/platform/`.

**Entry point / interpreter core**
- `main.c` — CLI entry point, VM init, DoE mode dispatch.
- `vm.c` — interpreter loop, stacks, dictionary state (the central
  runtime file).
- `vm_api.c` — external VM API implementation.
- `vm_bootstrap.c` — VM bootstrap initialization.
- `vm_debug.c` — debugging utilities.
- `vm_time.c` — time-related VM operations.
- `vm_internal.h` — internal-only declarations shared across the `vm_*.c`
  files, not part of the public `include/vm_api.h` surface.
- `repl.c` — REPL read-eval-print loop.
- `cli.c` — CLI argument parsing.
- `io.c` — I/O operations.
- `log.c` — logging infrastructure.

**Memory / dictionary / blocks**
- `memory_management.c` — dictionary allocator.
- `dictionary_management.c` — dictionary allocation and search.
- `dictionary_heat_optimization.c` — Loop #1 execution-heat tracking.
- `word_registry.c` — word registration system.
- `block_subsystem.c` — logical→physical block mapper.
- `blkio_file.c`, `blkio_ram.c`, `blkio_factory.c` — block I/O backends
  (file-backed, RAM-backed) and the factory that selects between them.
- `stack_management.c` — stack operations.

**Physics-driven adaptive runtime (7 feedback loops)**
- `physics_runtime.c` — main physics coordinator.
- `physics_hotwords_cache.c` — Loop #1 hot-words caching.
- `physics_metadata.c` — per-word metadata tracking.
- `physics_pipelining_metrics.c` — Loop #4 word-transition prediction.
- `physics_execution_hooks.c` — execution instrumentation.
- `rolling_window_of_truth.c` — Loop #2 circular execution-history buffer.
- `inference_engine.c` — Loops #5/#6, statistical inference (window-width,
  decay-slope).
- `ssm_jacquard.c` — L8 Jacquard steady-state mode selector; consumes
  `compudynamics.c` for tuning-word/config lookups.
- `compudynamics.c` — generic compudynamics module (`cd_tuning_word()`,
  `cd_tuning_vm()`); the score/UCB/reward/weight constants for the L8
  adaptive table live here, not in `ssm_jacquard.c`.
- `heartbeat_export.c` — heartbeat metrics export (CSV export function
  itself not yet implemented — see `docs/working/architecture/heartbeat_csv_export.md`).

**Math / measurement**
- `math_portable.c` — portable math functions.
- `profiler.c` — performance profiling.
- `doe_metrics.c` — Design of Experiments metrics (2^7 factorial).

Any `.bak` file alongside a `.c` file here (`doe_metrics.c.bak`,
`inference_engine.c.bak`, `vm.c.bak`) is a pre-edit backup left by a past
maintenance script (see `scripts/remove_loop_conditionals.sh`), not a
build input.