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When a `.build` target doesn't match the host, the runner can't execute the example here, so it verifies via `sx ir --target` only: asserts exit + the `.ir` snapshot (stdout) + diagnostics (stderr), never `.stdout`. An `.ir` snapshot is REQUIRED in ir-only mode — its absence is a loud failure, never a silent pass. - corpus_run.test.zig: ir_only flag (target set & !hostMatchesTarget); first dispatch arm runs `sx ir`, sets act_exit/act_err/act_ir; skip stdout in both update and verify modes; require ir_raw. - lock fixture 1639-platform-target-cross (asm-free main, target x86_64-linux, checked-in .ir). Verified: corrupt .ir => IR mismatch; delete .ir => require failure. Test-infra only; no compiler code. zig build test green (647 corpus, 444 unit).
50 lines
2.7 KiB
Markdown
50 lines
2.7 KiB
Markdown
# sx Inline Assembly — Checkpoint (ASM stream)
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Companion to `current/PLAN-ASM.md`; design in
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[docs/inline-asm-design.md](../docs/inline-asm-design.md). Update after every
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commit, one step at a time per the cadence rule (no commit may both add a test
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and make it pass).
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## Last completed step
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**0.1** — corpus runner **ir-only branch** for cross-target examples. Replaced
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0.0's loud placeholder bail: when `cfg.target` doesn't match the host (`ir_only`),
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`sweepRoot` skips run/build/exec and verifies via `sx ir --target` only —
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asserting `.exit` (ir cmd) + `.ir` (normalized stdout) + `.stderr`, never
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`.stdout` (write skipped in update mode, assertion skipped in verify mode). An
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`.ir` snapshot is **required** in ir-only mode — its absence is a loud failure
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("needs an .ir snapshot for ir-only mode"). Locked with
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`examples/1639-platform-target-cross.sx` (asm-free `main :: () -> i64 { return 0;
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}`), `.build` `{ "target": "x86_64-linux" }`, + checked-in `.ir`. Verified both
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guards fire: corrupting the `.ir` → IR mismatch; deleting it → the require-failure.
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`zig build test` green (647 corpus, 0 failed; 444 unit). Files:
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`src/corpus_run.test.zig`, `examples/1639-*`.
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## Current state
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Phase 0 steps 0.0 + 0.1 landed (test-infra only — no compiler code). The corpus
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runner reads `expected/<name>.build` (JSON `{ aot, target }`), threads `--target`,
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and gates on host arch+os: a matching target **executes** (full exit/stdout/stderr
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+ optional `.ir`); a mismatch runs **ir-only** (`sx ir --target`, asserting
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exit+ir+stderr, `.ir` required). Phase A–E feasibility already confirmed against
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the live tree (`LLVMGetInlineAsm` / `LLVMBuildCall2` / `LLVMAppendModuleInlineAsm`
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in LLVM@19 `Core.h`; ERR-stream `extractvalue`→tuple in `emit_llvm.zig:726-927`;
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lib-less `extern`, 60 sites; `--target` a global CLI flag).
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## Next step
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**0.2** — docs: update CLAUDE.md §"Testing"/§"Test layout" to document the
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`<name>.build` JSON config (`aot` + `target` keys, ir-only gating) replacing the
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standalone `.aot` marker prose (~lines 435, 492). Then Phase A (`kw_asm` keyword +
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lex test). See `PLAN-ASM.md` Phase 0 / Phase A.
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## Log
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- (init) Plan + design doc written; ASM stream opened.
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- (0.0) Corpus runner target-gating: `<name>.build` JSON config (replaces `.aot`
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marker), `--target` threading, `hostMatchesTarget` execute-gate, loud
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cross-target placeholder bail. Migrated 1226/1227 `.aot`→`.build`; locked with
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1638 fixture + unit tests. `zig build test` green.
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- (0.1) ir-only branch: cross-target examples verify via `sx ir --target` only
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(exit+ir+stderr, no stdout; `.ir` required). Locked with 1639 fixture; verified
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corrupt-.ir → mismatch and missing-.ir → loud failure. `zig build test` green.
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## Known issues
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None yet.
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