giles 85728621b0 vm-ext: phase A — extension dispatch fallthrough in sx_vm.ml ...

Adds Invalid_opcode of int exception and extension_dispatch_ref forward
ref (default raises Invalid_opcode op), plus the |op when op >= 200 arm
before the catch-all in the bytecode dispatch loop. Partition comment
documents 1-199 core / 200-247 extensions / 248-255 reserved.

Phase B will install the real registry's dispatch into the ref at module
init, replacing this stub.

Tests: 4 new foundation cases (Invalid_opcode for 200/224/247, Eval_error
for 199 to pin the threshold). +4 pass vs baseline, no regressions.

2026-05-15 08:06:35 +00:00

67 KiB

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