Extern import extraction contract - FAQ and troubleshooting

Platform spec article

Extern import extraction contract - FAQ and troubleshooting

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Spec standingStandard

Owner

Piotr Mikstacki pmikstacki@cybernomad.it

Submitter

Piotr Mikstacki pmikstacki@cybernomad.it

Current document

ADRs (3)

1. 0001-feature-hub-authority Feature hub authority Accepted

   This feature hub owns normative MUST/SHOULD contract text for Extern import extraction contract.

   Context

   Sibling articles under this feature previously restated requirements in inconsistent forms.

   Decision

   This feature hub owns normative MUST/SHOULD contract text. Sibling articles must not redefine hub requirements and should link here for authority.

   Consequences

   Contract changes start on the hub or in linked ADRs, then propagate to articles and implementation anchors.

   Verification anchors

   • site/website/src/content/docs/platform-spec/compiler/codegen-and-ir/extern-import-extraction-contract/index.mdx
   • article bundle under the same feature directory.

   Open full ADR page

2. 0002-spec-over-implementation-notes Specification over implementation notes Accepted

   Platform-spec text supersedes informal crate comments for Extern import extraction contract.

   Context

   Implementation crates accumulated informal notes that diverged from published contracts.

   Decision

   Normative platform-spec prose and ADRs under this feature supersede informal comments in implementation crates until explicitly migrated into spec text.

   Consequences

   Engineers file spec/ADR updates when behavior changes; crate comments are non-authoritative for conformance arguments.

   Verification anchors

   • compiler/crates/beskid_abi/src/builtins.rs
   • compiler/crates/beskid_runtime/src/builtins/mod.rs
   • compiler/crates/beskid_e2e_tests/src/tests/runtime_cases.rs

   Open full ADR page

3. 0003-extern-import-metadata-lowering Extern import metadata at lowering Accepted

   FFI symbols were discovered late in the engine.

   Context

   FFI symbols were discovered late in the engine.

   Decision

   Extern imports are collected during lowering (ExternImport in codegen context) with ABI names from beskid_abi—not ad hoc engine scans.

   Consequences

   Link-time binding stays aligned with language-meta C ABI profile.

   Verification anchors

   • compiler/crates/beskid_codegen/src/lowering/
   • compiler/crates/beskid_abi/src/symbols.rs.

   Open full ADR page

Articles

• Extern import extraction contract - Contracts and edge cases States the normative guarantees and what happens at boundaries or failure edges. article Standard
• Extern import extraction contract - Design model Explains the persistent concepts, entities, and boundaries this feature relies on. article Standard
• Extern import extraction contract - Examples Gives concrete newcomer-friendly scenarios mapped to real compiler paths. article Standard
• Extern import extraction contract - FAQ and troubleshooting Answers common operator and contributor questions with practical next checks. article Standard
• Extern import extraction contract - Flow and algorithm Walks through runtime/order-of-operations behavior in the implementation. article Standard
• Extern import extraction contract - Verification and traceability Shows how the team proves this feature works and where evidence lives. article Standard

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Full tree: run pnpm verify:platform-spec-layout (writes src/generated/platform-spec-layout-report.json).

Related spec docs

• Feature
  Extern import extraction contract

  Parent feature hub

This article documents faq and troubleshooting for extern import extraction contract in the reference compiler.

What this covers

For newcomers, this page explains where the contract shows up in day-to-day compiler work and which code paths are most useful first reads.

Anchored code paths

• compiler/crates/beskid_abi/src/builtins.rs and symbols.rs define import-facing ABI names.
• compiler/crates/beskid_runtime/src/builtins/mod.rs provides runtime implementations for extracted imports.
• compiler/crates/beskid_e2e_tests/src/tests/runtime_cases.rs verifies extern calls end-to-end.

Practical notes

• Prefer tracing from CLI/test entry points into analysis/codegen crates before changing internals.
• Treat diagnostics and tests as part of the contract, not optional implementation details.
• If behavior changes, update this article and add/adjust tests in compiler/crates/beskid_tests or compiler/crates/beskid_e2e_tests.