Vitte Roadmap 161-200 (Pro Version)

Steering framework

Scope: Complete Vitte's transition from an advanced compiler to a complete language platform, without sacrificing reliability.

Guiding principle: any added complexity must remain strictly lower than the system confidence it provides.

Definition of done global:

measurable functional impact
readable and actionable diagnostics
non-regression and robustness tests
synchronized technical documentation
risque residuel explicite et accepte

Strategic streams

Stream A - Type System, Inference, Generics, Traits (161-165, 168)

161. Advanced Type Inference

Objective: improve ergonomics without loss of static safety.
Deliverables:
inference of local variables
inference of simple returns
coherent propagation of constraints
unique unification engine
precise ambiguity diagnostics
explicit fallback rules
Acceptance:
no soundness regression on the typing suite
ambiguity diagnostics with concrete suggestion

162. Generics Foundation

Objective: introduce controlled and predictable generics.
Deliverables:
generic parameters
type substitution
minimal monomorphization
simple constraints (base bounds)
clear generic diagnostics
Acceptance:
generic standard examples compile
localized constraint errors with reliable spans

163. Generic Monomorphization

Objective: generate specialized instances without unnecessary duplication.
Deliverables:
instance cache
deterministic specialization keys
elimination of duplicates
MIR specialization
backend specialization
Acceptance:
deterministic build for same inputs
reduction of duplicates verified by metrics

164. Trait / Interface Foundation

Objective: provide a stable typical abstraction.
Deliverables:
definitions of traits/interfaces
method resolution
verification of impl
recovery diagnostics
minimum line bounds
Acceptance:
consistency of impl guaranteed
resolution ambiguity properly reported

165. Dynamic Dispatch Support

Objective: support runtime polymorphism safely.
Deliverables:
vtables
fat pointers
runtime dynamic dispatch
verification object safety
Stable ABI for dyn types
Acceptance:
valid dyn calls on supported targets
explicit rejection of non-object-safe cases

168. Const Generics Foundation

Objective: support constant parameters in types.
Deliverables:
const parameters
integration eval const
generic tables
overflow diagnostics
Acceptance:
deterministic const evaluation
reproducible and understandable overflow errors

Stream B - Pattern Semantics & Completeness (166-167)

166. Advanced Pattern Matching

Objective: make the match robust and complete.
Deliverables:
completeness check
detection of unreachable branches
nested patterns
guards (if active)
correction-oriented diagnostics
Acceptance:
no false negative criticism on completeness
dead branches precisely detected

167. Exhaustiveness Engine

Objective: ensure full coverage of variants.
Deliverables:
decision tree
variant coverage
wildcard analysis
unreachable detection
Acceptance:
reusable engine for match/select
complexity mastered on large enums

Stream C - Macro & Frontend Pipeline (169-170)

169. Macro System Foundation

Objective: add metaprogramming without weakening the language.
Deliverables:
hygienic macros
token expansion
recursion limits
diagnostics with macro spans
trace of expansion
Acceptance:
hygiene validated in case of name capture
recursion stopped with actionable message

170. Macro Expansion Pipeline

Objective: integrate the expansion into the frontend in a stable manner.
Target pipeline:
source -> lexer -> macro expand -> parser -> AST
Verifications:
correct spans from start to finish
diagnostics preserved after expansion
recursion protection safe

Stream D - Async, Coroutines, Concurrency (171-174)

171. Async Foundation

Objective: establish async primitives.
Deliverables:
async functions
lowering towards futures
lowering await
async MIR support
async misuse diagnostics

172. Coroutine Lowering

Goal: convert async to reliable state machine.
Deliverables:
Generator MIR
ellipsis/resume
captures of premises
drop safety

173. Concurrency Memory Model

Objective: formalize concurrent memory behavior.
To document:
atomics
synchronization
inter-thread visibility
ordering rules
data-race guarantees

174. Parallel Borrow Analysis

Objective: make borrow checking parallel compatible.
Deliverables:
equivalents Send/Sync
shared mutation checks
thread ownership rules
competition diagnostics

Stream E - Backends, ABI, Perf, Execution Modes (175-181)

175. Advanced Optimization Passes

inline, loop simplification, branch folding, scalar replacement, dead store elimination, value numbering.
Acceptance: measurable gains on reference benches without semantic regression.

176. LLVM Backend Experimental

LLVM IR emission, metadata debug, optimization bridge, target lowering, integration linker.
Acceptance: experimental isolate flag + minimum functional parity.

177. Native ASM Backend

register allocation, calling convention, layout stack, instruction selection, prologue/epilogue.
Acceptance: stable target subset + green ABI tests.

178. Register Allocator

liveness analysis, spills, register classes, diagnostics.
Acceptance: priority correction before performance.

179. Low-level ABI Test Suite

stack alignment, calling convention, passing structs, returns, varargs if supported.
Acceptance: ABI matrix by target with explicit reporting.

180. JIT Foundation

MIR interpreter, JIT experimental backend, loader runtime, symbol resolver.

181. MIR Interpreter

MIR ops execution, minimal memory model, step-by-step debug, const eval reuse.

Stream F - Tooling Platform (182-185)

182. Compile Embedding API

compile_from_memory, diagnostic callbacks, custom source loader, backend hooks, incremental embedding.

183. IDE Integration Complete

semantic highlighting, incremental diagnostics, intelligent completion, rename, references, code actions.

184. Refactor Engine

rename symbol, extract function, organize imports, inline variable, rewrites sure.

185. Advanced Formatter

configurable styles, stable comments, macro formatting, determinism, edition-aware.

Stream G - Analysis, Safety, Security (186-189)

186. Static Analysis Framework

nullability (if supported), misuse lifetime/unsafe, unreachable logic, smells performance.

187. Security Analysis Passes

detection overflows, dangerous memory patterns, suspicious casts, groundwork taint, insecure API warnings.

188. Unsafe Code Model

unsafe blocks/functions/traits, explicit diagnostics, unsafe tracking in MIR.

189. Verified Unsafe Boundaries

unsafe audit logs, unsafe summaries, unsafe call graph, propagation warnings.

Stream H - Runtime, Interop, Targets, Research, Formalization, Platform (190-200)

190. Advanced Runtime Services

allocator, threading, timers, async scheduler, panic hooks, I/O abstraction.

191. GC Experimental Mode

optional GC runtime, bridge ownership/GC, compatibility diagnostics, performance metrics.

192. Foreign Function Interface

external declarations, ABI verification, symbol linking, unsafe FFI borders, mismatch diagnostics.

193. Bindgen Foundation

parse minimal headers C, generation Vitte declarations, ABI checks, validation layout.

194. Embedded Target Support

no_std, custom allocators, freestanding runtime, linker scripts, memory maps.

195. Kernel Mode Foundation

mode without runtime, panic handlers custom, subset interrupt-safe, subset kernel memory-safe.

196. Compile Research Sandbox

experimental branches, isolated MIR passes, unstable namespace syntax, sandbox diagnostics.

197. Verified Compiler Pipeline

partial proofs of invariants, verified passes, property tests, semantic equivalence checks.

198. Formal Semantic Model

operational semantics, ownership semantics, groundwork soundness of types, MIR execution semantics.

199. Vitte Language Platform

compile, stdlib, runtime, package manager, IDE/CI tooling, docs, ecosystem.

200. Vitte Platform Complete Foundation

Mandatory criteria:
stable compiler
credible self-host
real backend
professional diagnostics
complete tooling
maintainable stdlib
maintainable runtime
minimal package ecosystem
IDE support
deterministic builds
active replay/debug/fuzz/stress
strong technical documentation
minimum security verified
extensible architecture
technical governance defined
Final gate:
any feature must justify its cost in complexity by a net gain in measurable reliability.

Recommended sequencing (macro-priorities)

P0 (core reliability): 161, 162, 164, 166, 167, 173, 188 P1 (language capabilities): 163, 165, 168, 169, 170, 171, 172, 174 P2 (execution/perf): 175, 178, 179, 181, then 176/177/180 P3 (platform): 182, 183, 184, 185, 186, 187, 189 P4 (expansion): 190 to 195 P5 (long-term confidence): 196, 197, 198, 199, 200

Tracking KPIs

soundness regressions: 0 tolerated
deterministic build rate: 100%
crash-free compile sessions (CI corpus): > 99.9%
actionable diagnosis rate (internal triage): > 95%
perf compile (median): trend stable or better per release
unsafe surface growth: monitored, justified, and bounded

Critical risks to monitor

explosion of complexity inference/generics
trait/impl coherence derivative
fragility spans/diagnostics via macros
subtle regressions in lowering async/coroutines
ABI discrepancies between backends
unsafe extension faster than guardrails

Absolute rule of governance

The added complexity must always be less than the confidence gained in the reliability of the system.