[nahime0]

The generated encoding catalog is a const slice containing all codec byte tables. Multiple consumers instantiate those tables repeatedly in the mbstring bridge. Make the catalog one immutable static and preserve that policy in the generator. Encoding order, aliases, codecs and table bytes are unchanged.

On Linux x86_64 with isolated release bridge builds, the standalone mbstring archive decreases from 144,674,846 to 39,858,218 bytes. Using the same compiler, source path and other bridges, a two-line opaque-eval executable decreases from 136,183,056 to 32,095,504 bytes in default stripped mode (76.4% smaller), or 147,036,640 to 42,784,824 bytes with symbols. The eval-free catalog/codec probe decreases from 123,029,256 to 18,781,504 bytes with heap debug and symbols. These are footprint measurements, not execution-time speedup claims.

Validation: all four catalog tests and 80 codec corpus tests pass against the captured PHP oracle. The catalog/codec probe matches real PHP8.5.11 with optimizer on/off and clean heap-debug summaries. Regeneration is repeatable and git diff --check passes. Add the probe under benchmark/diagnostics for reproducing the linked footprint.

Seven alternating warm-cache compilation pairs of the same opaque-eval source, with before/after compiler/linker process guards, measure median process time 7.477 to 7.079 seconds and median linking time 917.77 to 770.88 ms. All measured phase MAD/median ratios are below 2.72%. Code generation and assembly confidence intervals overlap parity; this change reduces linked data without removing their helper generation work.

[nahime0]

@greptileai please review the current head f5aa2c9.

[greptile-apps]

Confidence Score: 5/5

[Medium impact] This PR appears safe to merge; no actionable issues were found.

Summary

Changes ENCODINGS from a const slice to one immutable static, and updates the generator to preserve that choice.

• The mbstring bridge stores its encoding catalog once.
• A PHP probe exercises mbstring for footprint comparisons.

_{Reviews (1) · Last reviewed commit: "perf(mbstring): share one immutable enco..." · Reviewed by Greptile}