Section 3 of 51
PART III — Internal Compiler Architecture
Stable section ID: S05-CON-008-SECTION-3 · 30 content blocks
57. Compiler Core Architecture
The Engineering Compiler Core is the controlled execution environment in which BDL sources, engineering profiles, libraries, rules, evidence, and target requirements are transformed into validated engineering representations and authorized output packages.
The Compiler Core shall be organized as a layered architecture consisting of:
input ingestion and source management;
lexical and syntactic processing;
semantic interpretation;
identity and namespace resolution;
type, unit, and coordinate processing;
configuration and profile resolution;
engineering graph generation;
constraint, compatibility, evidence, and state evaluation;
intermediate representation management;
target-specific output generation;
diagnostic, provenance, and audit services.
Each layer shall expose governed interfaces and shall not bypass the responsibilities of another layer. A back-end output generator, for example, shall not reinterpret unresolved source syntax or independently override engineering decisions established by the Semantic or Engineering Engine.
The Compiler Core shall preserve separation between:
what was declared;
what was imported;
what was observed;
what was assumed;
what was derived;
what was selected;
what was validated;
what was approved;
what remains unresolved.
Compilation shall occur within an identifiable Compilation Context containing the exact compiler version, BDL version, schemas, packages, profiles, rule libraries, configuration settings, target definitions, and security policies used.
The Compiler Core should support complete, partial, incremental, and lifecycle compilation. Recompilation may be limited to affected entities when dependency analysis establishes that unaffected results remain valid.
Safety-significant compilation shall be deterministic and reproducible. Equivalent inputs processed under the same governed context shall produce equivalent canonical results, diagnostics, and decision records.
Optimization, AI recommendations, and probabilistic inference may assist compilation, but they shall remain distinguishable from deterministic validation and shall not silently modify authoritative engineering meaning.
The Compiler Core is not itself the final engineering authority. It provides traceable interpretation, evaluation, coordination, and output generation within the authority established by applicable law, System05 governance, approved profiles, certification systems, and authorized professionals.