fortranspire.agent.translation_graph_phase1

LangGraph wiring for Phase 1 — Fortran → OpenACC GPU + Cython.

This module used to hold all six pipeline nodes inline (~1400 lines, hard to test, hard to extend). Now it’s just the graph definition; each node lives in its own module under fortranspire.agent.nodes.

Pipeline (sequential, no branching):

init → parser → extractor → pure_elemental → openacc → cython_wrapper

→ equivalence_harness → validation → END

LLM call budget (4 maximum):

• extractor — 1 call (reasoning)

• openacc — 1 call (reasoning)

• cython_wrapper — 2 calls (code)

The other three nodes (init, parser, pure_elemental, validation) are deterministic and never touch an LLM.

Compilation targets validated by validation:

• gfortran -fsyntax-only (CPU flavour, stripped of !$acc directives)

• gfortran -fopenacc -fsyntax-only (CPU flavour with directives)

• nvfortran -acc -gpu=cc80 -fsyntax-only (GPU flavour, A100)