frontend-reentrancy #1
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`--inject` now builds a full top-level declaration `gen :: proc() { _ = dub(21) }` entirely in-process (no source string, no parser), collects it into the live package via check_collect_value_decl, drains the exported-entity queue, checks the signature, and drains the deferred body through check_proc_info. The body is genuinely type-checked: INJECT_BAD=1 swaps in `dub("x")` and the checker rejects it ("Cannot convert '"x"' to 'int' from 'untyped string'"). This is the emit-^Ast half of the metaprogram loop: a metaprogram can synthesize a declaration and have it collected + checked in the same session, no string marshaling, no parser re-entry. Documents the one caveat: hand-built proc/constant entities land with .file == nil (check_collect_value_decl sets e.file only on the variable branch), so the drain sets item.entity.file before add_entity_with_name_info. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>cmd/runcheck evaluates value-position `X :: #run f()` constants (vm2, no backend link — same philosophy as cmd/macrocheck) and compares folded values to sibling .expect files. Per-fixture init_universal exercises the proven re-entrant path; multiple fixtures run cleanly in one process. Value channel: synthesize `__frun_N :: proc() -> int { return f() }` and read its return slot via ovm.run_program_value (host-safe + unclamped). This replaces run_directive.odin's dead `exit(<call>)` mechanism, which routed through the foreign exit handler -> libc.exit (would kill the harness) and capped at 0..255. Tier-0 GATING (green): t0_basic (scalar incl. negative), t0_wide (full 64-bit, proving the channel is unclamped), t0_error (bad #run body -> !error, no fold). PENDING: pending/r2_rtti (#run reading type_info_of -> int; checks but vm2 can't yet execute RTTI). tests/run/run.sh runs gating (must pass) + pending (reported, non-gating); README maps each Rx.y id -> fixture -> status and scopes T1/T2/T3. Depends on an additive ovm.run_program_value in odin-vm2/src/run.odin (left uncommitted there atop the user's in-progress vm2 changes). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>vm2 is incomplete and must not be used as a backend; rebuild the #run harness on backend-llvm (the ORC LLJIT run-driver). - run_directive.odin: run_eval_consts now parses, neutralizes each `X :: #run f()`, synthesizes an exported `fs_run_N :: proc "c" () -> int { context = runtime.default_context(); return f() }`, checks, codegens, and JIT-runs every entry, reading its i64 return. The @(export) attribute (synthesized before check) makes each entry a minimum-dependency ROOT so it + its callees survive DCE and get external linkage; the context setup lets a #run body call ordinary Odin procs. - backend-llvm/jit.odin: lb_run_jit_i64_multi — build the JIT once, resolve+call N `proc "c" () -> i64` symbols (lb_run_jit_i64 consumes the modules, so N calls can't). - barnyard_native.odin: barnyard_jit_eval_symbols — public codegen+multi-JIT helper (reaches the file-private native_* setup). - cmd/runcheck: thin driver over fs.run_eval_consts; links the full backend stack. Tier-0 GATING green via LLVM (one process, re-entrant): t0_basic (scalar incl. negative), t0_wide (full 64-bit), t0_error (!error). PENDING pending/r2_rtti now EXECUTES under LLVM (returns -1) where vm2 couldn't run it — Type_Info_Struct match still fails (JIT type-info table incomplete for a metaprogram-only type). run.sh now builds the backend stack (needs libcranelift_wrap.a per STATUS.md); README updated. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>Implements the dynamic #insert path: `#insert f()` where f is a metaprogram returning a Code value. The driver (src/insert_directive.odin) runs Model A — "check, then re-enter" — over TWO parses to avoid re-checking a mutated, already- checked tree: ROUND 1 (provisional): parse, EMPTY any body containing a computed #insert (only the metaprograms need to run), synthesize an exported `fs_insert_N :: proc "c" () -> rawptr { context = runtime.default_context(); return <operand> }`, check, codegen, JIT-run each -> a ^Ast Code node. ROUND 2 (authoritative): fresh parse; splice each Code node's statements (cloned into round-2's file; clone_ast nils ident entities so they re-resolve) in place of the #insert; check ONCE. The directive is gone -> no re-trigger. - backend-llvm/jit.odin: lb_run_jit_code_multi (build JIT once, run N code entries). - barnyard_native.odin: barnyard_jit_eval_code_symbols (codegen + multi code-JIT). - cmd/insertcheck + tests/insert/: I1 splice+recheck, I2 spliced value USED by the caller, I3 spliced stmt CALLS a program proc (the identity canary — Plan-2's predicted "5th fork" did NOT bite), I7 negative (bad spliced #code rejected). 4/4 green. Plan-1 runcheck regression still 3/3. Seam `#insert #run gen()`, nested/recursive #insert, and operands closing over a caller local are noted as not-yet-wired in tests/insert/README.md. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>type_info_of(T) was never broken in the metaprogram JIT — the r2_rtti fixture was wrong. A top-level `Point :: struct{...}` is a NAMED type, so type_info_of(Point).variant is Type_Info_Named, not Type_Info_Struct; the fixture matched Type_Info_Struct directly (correctly false) and looked like a backend bug. Corrected to unwrap via runtime.type_info_base; r2_rtti now reads field_count=3 at compile time and is promoted from pending/ into gating (4/4 run suite green). Diagnosis tooling: FS_JIT_DUMP_IR=<prefix> dumps each JIT'd module's .ll (jit_build_and_load) — that showed type_info_data[110] was Type_Info_Named. Re-entrancy fork FIXED: lb_reset_global_type_info_state() (backend general.odin), called at the top of lb_generate_code. The process-global type-info offset cursors (lb_global_type_info_*_index) are append-only per codegen; the in-process driver runs lb_generate_code once per #run/#insert session, so without a reset session N inherited N-1's cursors and type_info_of read the wrong giant-array slot. No-op for single-shot builds. Also: reuse the #run operand node directly instead of clone_ast (avoids a needless copy / potential type-identity split). A separate OPEN fork — a failed-check session corrupts the next session's RTTI codegen — is worked around by ordering failing-check fixtures last in run.sh (documented). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>#run results now carry their real type, not just i64. Each entry is synthesized as `proc "c" () -> rawptr { context = runtime.default_context(); return new_clone(f()) }` — new_clone heap-allocates ^T and copies the value, so any type comes back through one rawptr ABI. The driver keeps the JIT alive (barnyard_jit_eval_ptrs / lb_jit_eval_ptrs, no dispose) and decodes the heap value per the const's CHECKED type (operand.tav.type): int/uint/bool/enum -> i64 (sign-/zero-extended by size), f32/f64 -> f64, string -> bytes copied out before dispose (string data lives in module rodata). run_eval_consts returns map[string]Run_Value {kind, i, f, s}; runcheck's .expect now parses 42 / 3.14 / "hello" and compares by kind (float with epsilon). New gating fixture t1_typed (string/f64/f32/bool/enum/u64) — run suite 5/5, insert 4/4. Backend additions are purely additive: lb_jit_eval_ptrs + lb_jit_dispose (jit.odin), barnyard_jit_eval_ptrs + barnyard_jit_dispose (barnyard_native). Aggregates (array/struct) decode to Invalid for now; folding typed values back into the AST (run_fold_consts) still only handles the integer kind. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>Finishes the typed fold-back. Run_Value gains an .Agg kind + nested `elems`. decode_run_value reads aggregate heap bytes per the type — Type_Array (elem/count) and Type_Struct (fields + computed offsets) — recursively into child Run_Values. fold_literal's new .Agg case synthesizes a compound literal via mk_compound_lit: type_expr emits `Name` for a named type or `[N]E` for an anonymous fixed array (mk_array_type), and elements fold recursively, so nested struct/array nest too. Anonymous structs (no nameable literal type) fall through to nil. New fixture fold_agg folds [3]int / Point / Line{Point,Point} (nested struct) / [2][2]int (nested array) and uses ARR[0] as a const array size — 4/4 folded + re-checked. runcheck value-mode switches handle the new kind (aggregates are exercised via --fold, not value comparison). run 5/5 + fold 2/2 + insert 8/8. Typed fold-back is now complete: int/uint/float/string/bool/enum + array/struct. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>