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P5.2: emit_object() -> string query primitive

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The compiler emits the sx object eagerly (the Zig driver, before the post-link
callback), so emit_object is a QUERY (not an action): it returns the path from
a new BuildConfig.object_path field main.zig forwards — no driver vtable. This
completes the build-pipeline QUERY primitives (emit_object / c_object_paths /
link_libraries); only link (the genuine action) remains for the vtable step.

Extended examples/1662 to also assert emit_object().len > 0. 703/0 both gates.
This commit is contained in:
agra
2026-06-19 07:58:59 +03:00
parent 44dfdcddf9
commit 83de0fa04d
8 changed files with 57 additions and 19 deletions
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current/PLAN-COMPILER-VM.md
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@@ -509,10 +509,13 @@ The compiler's whole post-IR role: codegen → build the CLI-derived `BuildConfi
serviced by `comptime_vm.callCompilerFn` over `BuildConfig` fields `main.zig` forwards; new VM `makeStringList`
builds the `List(string)` in flat memory from the call's result type (`ins.ty` now threaded through
`invoke`/`callCompilerFn`). Smoke test `1662-platform-build-pipeline-queries` (AOT + C companion). 703/0 both
gates. **P5.2b — the ACTIONS (`emit_object -> !string`, `link(...) -> !`, reuse `target.zig`):** still TODO —
they replace the Zig driver's auto-emit/auto-link, so they need the driver restructuring + a host-installed
callback vtable (`comptime_vm.zig` can't depend on `core`/`main`/`target`); `link`'s fallible `-> !` return is
the new VM shape.
gates. **`emit_object() -> string` is also DONE (2026-06-19)** as a QUERY (not an action): the Zig driver emits
the object eagerly, so the primitive just returns the path from `BuildConfig.object_path` (no vtable). So all
three QUERY primitives are done. **P5.2b — `link(...) -> !` (the one genuine ACTION):** still TODO — it replaces
the Zig driver's auto-link, so it needs the driver restructuring + a host-installed callback vtable
(`comptime_vm.zig` can't depend on `core`/`main`/`target`) + a `List(string)`-arg reader (inverse of
`makeStringList`) + the fallible `-> !` return (a `(value…, tag=0)` tuple, since `!T` is a tuple). Test it via a
post-link callback linking to a TEMP output (the Zig driver still links until P5.4).
- **P5.3 — `on_build` slot:** a comptime-assignable compiler slot (GENERALIZES today's `post_link_callback_fn`:
an assignable typed global with a stdlib default, vs a setter). `#run on_build = build;` captures the
`FuncId`; the compiler invokes it post-codegen with the CLI-derived `BuildConfig`.