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IC: add inert --icBackendStage/--icBackendModule switches (Phase 2b scaffold)

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Config plumbing for the per-module backend: icBackendStage (cg|merge|emit, empty
= today's whole-program backend) and icBackendModule (the NIF suffix the cg/emit
stage operates on). No behavior yet -- the nifbackend stages and deps.nim rules
that consume these land next. Whole-program backend, koch boot, and a 2-module
IC build are unchanged.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Araq
2026-06-13 21:03:55 +02:00
parent 051ac67968
commit 7ea5aeedfd
2 changed files with 25 additions and 0 deletions
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13
compiler/commands.nim
View File

@@ -960,6 +960,19 @@ proc processSwitch*(switch, arg: string, pass: TCmdLinePass, info: TLineInfo;
# config loading can replay it instead of re-parsing the `nim.cfg` chain.
expectArg(conf, switch, arg, pass, info)
conf.icPreparsedConfig = arg
of "icbackendstage":
# `nim nifc` only: per-module backend stage, one of cg|merge|emit (see
# options.icBackendStage). Empty (switch unused) keeps the whole-program
# backend. Emitted by `deps.nim`'s backend build file.
expectArg(conf, switch, arg, pass, info)
if pass in {passCmd2, passPP}:
conf.icBackendStage = arg
of "icbackendmodule":
# `nim nifc` only: the NIF module suffix the cg/emit stage operates on (see
# options.icBackendModule).
expectArg(conf, switch, arg, pass, info)
if pass in {passCmd2, passPP}:
conf.icBackendModule = arg
of "import":
expectArg(conf, switch, arg, pass, info)
if pass in {passCmd2, passPP}:

12
compiler/options.nim
View File

@@ -418,6 +418,18 @@ type
# process; only the `ic` driver serialises them.
# Path-search switches are excluded — the driver
# forwards the resolved `searchPaths` as `--path`.
icBackendStage*: string # under `nim nifc`: which stage of the per-module
# backend this invocation runs — "cg" (codegen one
# module to its `.c.nif`), "merge" (global liveness
# + owner assignment across all `.c.nif`), "emit"
# (render one module's `.c` from its `.c.nif` + the
# merge decision). Empty = today's whole-program
# backend (load all, codegen+DCE+cc+link in one
# process). See `compiler/nifbackend.nim`.
icBackendModule*: string # under `nim nifc` with icBackendStage in {cg,emit}:
# the NIF module suffix this invocation codegens or
# emits. The other modules are loaded only so types
# resolve; their definitions are referenced extern.
spellSuggestMax*: int # max number of spelling suggestions for typos
cppDefines*: HashSet[string] # (*)