ludic/tools/x/selfhost_test.ludic

# selfhost_test.ludic — the self-hosting suite: the compiler is correct (compiles
# diverse programs to working binaries) and self-reproducing (the bootstrap
# fixpoint). Replaces selfhost/test.sh.

# compile selfhost/tests/<name>.ludic with bin/ludicc, assemble, run, compare
function sh_case(name: pointer, exp: pointer) -> void {
  let ll = `/tmp/x_sh_{name}.ll`
  let er = `/tmp/x_sh_{name}.err`
  let bn = `/tmp/x_sh_{name}`
  if not shq(`bin/ludicc selfhost/tests/{name}.ludic > {ll} 2>{er}`) {
    bad2(`{name}: self-host errored`, capture_line(`head -1 {er}`)); return
  }
  if not shq(`{cc()} {ll} -o {bn} 2>/dev/null`) { bad(`{name}: IR did not assemble`); return }
  let got = capture_line(`{bn} < /dev/null`)
  if (got == exp) { ok(`{name} ({got})`) } else { bad2(name, `got [{got}] want [{exp}]`) }
}

# compile examples/<path>.ludic as a game, render it headless, and compare the
# framebuffer's SHA-256 against the text baseline in selfhost/golden/renders.sha256.
# A hash is tiny and text-diffable — a regression shows as a changed hex line in a
# review, not an opaque "binary files differ". Regenerate the baseline with
# `bin/x golden` (see cmd_golden below).
function game_case(path: pointer, keys: pointer) -> void {
  let nm = flat(path)
  if not game_build_ok("bin/ludicc", `examples/{path}.ludic`, `/tmp/x_g_{nm}`) { bad(`{path}: build`); return }
  run("mkdir -p build")
  run(`printf '%s' '{keys}' | /tmp/x_g_{nm} >/dev/null 2>&1`)
  let got = capture_line("shasum -a 256 build/out.ppm | cut -d' ' -f1")
  let want = capture_line(`grep '^{path} ' selfhost/golden/renders.sha256 | cut -d' ' -f2`)
  if (want == "") { bad2(path, "no golden hash (run: bin/x golden)"); return }
  if (got == want) { ok(`{path} matches the golden render`) }
  else { bad2(path, `render hash {got} != golden {want}`) }
}

# render one golden game and return its "<path> <sha256>\n" manifest line (empty
# string on build failure). Shared by `bin/x golden` and nothing else.
function bless_render(path: pointer, keys: pointer) -> pointer {
  let nm = flat(path)
  if not game_build_ok("bin/ludicc", `examples/{path}.ludic`, `/tmp/x_bg_{nm}`) {
    err(`golden: {path} failed to build\n`); return ""
  }
  run("mkdir -p build")
  run(`printf '%s' '{keys}' | /tmp/x_bg_{nm} >/dev/null 2>&1`)
  let h = capture_line("shasum -a 256 build/out.ppm | cut -d' ' -f1")
  return `{path} {h}\n`
}

# regenerate the text render baseline. The keys here MUST match game_case's so
# the baseline and the checks render the same frame. Deliberate, reviewable:
# run it, then `git diff selfhost/golden/renders.sha256` shows exactly which
# render changed before you commit the new hash.
function cmd_golden() -> int {
  ensure_ludicc()
  if not is_exec("bin/ludicc") { err("golden: bin/ludicc unavailable\n"); return 1 }
  var manifest = ""
  manifest = manifest + bless_render("games/snake", "ddssaawwddss")
  manifest = manifest + bless_render("games/menu", "ssss")
  manifest = manifest + bless_render("games/chronorift", "ddddwwwwaassK")
  manifest = manifest + bless_render("rendering/draw_prims", "")
  if not write_file("selfhost/golden/renders.sha256", manifest) {
    err("golden: could not write selfhost/golden/renders.sha256\n"); return 1
  }
  print("wrote selfhost/golden/renders.sha256:")
  out(manifest)
  print("review the change: git diff selfhost/golden/renders.sha256")
  return 0
}

function cmd_selfhost_test() -> int {
  PASS = 0
  FAIL = 0

  print("== build the self-host compiler (from the IR seed, no C) ==")
  ensure_ludicc()
  if is_exec("bin/ludicc") { ok("compiler builds from the IR seed (no C)") }
  else { bad("self-host build"); return report() }

  print("== the self-host compiler is correct ==")
  sh_case("structs", "7 9 109 2 42")
  sh_case("slices", "0 20 361 777")
  sh_case("sort", "0 39 20 1 2 3 3 1 30 10 20 40 2 8")
  sh_case("control", "55 4 15 1")
  sh_case("match_bits", "1 2 9 16 4 15")
  sh_case("fixed", "2 3 0 6 1")
  sh_case("math", "3 7 5 10 -1 0 1 2 3 3 2 5 25 50")
  sh_case("math2", "1414 3 999 999 499 5 5 25 3142 179 4 2 7 25 30 500")
  sh_case("textlist", "3 10 30 1 0 2 -1 30 10 10 30 30 2 0 11 104 1 0 1 0 1 0 6 -1 42 5 1 4 4")
  sh_case("textlist2", "3 1 1 1 2 1 6 1 1 3 1 1 3 1 4 1 2 99 3 2 0 3 1 9 3")
  sh_case("easecollide", "250 750 500 1000 1000 999 765 -88 1000 1 0 1 0 0 1 0 1 0")
  sh_case("memsys", "65 66 0 99 12345 1")
  sh_case("math3", "45 90 180 -135 30 60 90")
  sh_case("transcend", "2718 1 148 1000 0 2303 1024 1414 3 250 0 1000 1016")
  sh_case("vector", "3 4 5 4 6 2 2 11 2 6 999 999 999 1570 5 10")
  sh_case("datetime", "10800 330 172800 3 2 0 10957 2026 8 30 4 6 1 0 1 29 28 31 2 1 365 946729815 2000 1 1 12 30 15 6 10957 1")
  sh_case("datetime2", "2026-08-30 07:05:09 30/08/26 0 -1 3600 5400 30 0")
  sh_case("textsplit", "1 1 1 3 1 1 1 1 1 1 1")
  sh_case("hash", "-2128831035 -468965076 114400290 114400290 0 -873187034 1095738169 0 1364076727 -2114883783 -845898438 -845898438 -78065325 -78057399 -3750763034362895579 -5808556873153909620 -4100651535478758590 -4100651535478758590 0 -5451962507482445012 7256831767414464289")
  sh_case("crypto", "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855 ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad d7a8fbb307d7809469ca9abcb0082e4f8d5651e46d3cdb762d02d0bf37c9e592 9f4390f8d30c2dd92ec9f095b65e2b9ae9b0a925a5258e241c9f1e910f734318 b35439a4ac6f0948b6d6f9e3c6af0f5f590ce20f1bde7090ef7970686ec6738a ffe054fe7ae0cb6dc65c3af9b61d5209f439851db43d0ba5997337df154668eb f7bc83f430538424b13298e6aa6fb143ef4d59a14946175997479dbc2d1a3cd8 5bdcc146bf60754e6a042426089575c75a003f089d2739839dec58b964ec3843 1 0 0 1 0 0 616263")
  sh_case("long", "1000000000000 1000000000001 1000000000005 3000000000000 1 1 1 -1000000000000 1000000 13")
  sh_case("color", "16744512 1090486336 1090486336 8355711 8355711 8355711")

  print("== the self-host compiler compiles real games (vs golden output) ==")
  # the golden render hashes were first produced by the original C compiler; the
  # self-hosted compiler must reproduce the same framebuffer, byte for byte, so
  # its SHA-256 matches the checked-in baseline in selfhost/golden/renders.sha256.
  game_case("games/snake", "ddssaawwddss")
  game_case("games/menu", "ssss")
  game_case("games/chronorift", "ddddwwwwaassK")
  game_case("rendering/draw_prims", "")

  print("== the bootstrap fixpoint (seeded from bin/ludicc) ==")
  if shq("bin/x bootstrap > /tmp/x_boot.out 2>&1") { ok("gen2.ll == gen3.ll (compiler reproduces itself)") }
  else { bad("fixpoint not reached"); out(capture("cat /tmp/x_boot.out")) }

  print("== the C-free bootstrap (from the checked-in IR seed, no C compiler) ==")
  if shq("bin/x bootstrap-cfree > /tmp/x_cfree.out 2>&1") { ok("seed.ll rebuilds the compiler and is its own fixed point") }
  else { bad("C-free bootstrap failed (seed stale? run: x reseed)"); out(capture("cat /tmp/x_cfree.out")) }

  return report()
}