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ludic/selfhost/backend/stdlib/emit_fs.ludic
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feat(engine): Tiled P1 — rt_tmap model + GID resolver + render + projection (#69) 
The heart of Tiled support: load a map and draw it.

- rt_tmap model (Tmap/TmLayer/TmTileset in tiled.ludic): map header + ordered
  layers (dense int32 GID arrays, heap-allocated to w*h, lifting the 96x64 cap)
  + tilesets. Built from the intermediate Value tree, so the TMX and TMJ paths
  both feed it.
- GID resolver (Tiled.resolve): gid -> (tileset, localId, flipH/V/D); the three
  flip flags masked off before the local-id lookup, returned alongside. gid==0
  is empty.
- Image-backed render (Tiled.draw): every visible tile layer in file order,
  blitting each tile from its tileset image with flips applied at draw.
- Compatibility projection (Tiled.project / auto on load): a designated
  collision layer projects to the legacy byte tilemap ('#' solid, '=' one-way
  via the oneway property, ' ' empty) so Grid.*/Path.*/esys_move are unchanged.
- Tiled.load resolves external tilesets + images relative to the map file and
  auto-projects a collision/solids/walls layer.
- The grid and physics_tiles demos now run off a loaded map (grid_maze.tmx /
  physics_map.tmx) instead of hand-authored Map.row strings, byte-identically.

Two compiler fixes fell out of this (see the changeset):
- emit_index_addr set g_addr_ty before evaluating the index, so slice[obj.field]
  came back mis-typed; set it last, like the raw-pointer branches.
- @strcmp was declared by both the world table and the fs prelude; centralise
  it in the head prelude so a game that uses Fs/Path links.

Proven by library/tiled_p1.ludic (14 assertions: loads+renders Kenney map
identically from .tmx and .tmj, flip mirroring) + the converted grid/
physics_tiles demos. x test: 92 passed; self-host bootstrap fixpoint intact.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-09-01 14:43:29 +03:00

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# emit_fs.ludic — the Fs.* / Path.* / Mime.* namespaces: the filesystem, wrapped
# into one safe, ergonomic API so a non-expert never touches a file descriptor or
# a byte buffer. The foundation for saves, config, mods, and asset loading. The
# bare file_* builtins remain the low-level primitive; this is the layer above.
#
# Path.join(a, b) join two path segments with the separator
# Path.dir(p) the directory part ("mods/foo/x.json" -> "mods/foo")
# Path.base(p) the final component ("mods/foo/x.json" -> "x.json")
# Path.ext(p) the extension incl. dot (".json"), or "" if none
# Path.stem(p) the base without its extension ("x")
# Path.normalize(p) collapse "." / ".." / duplicate separators
#
# Fs.exists(p) does the path exist? -> bool
# Fs.is_dir(p) is it a directory? -> bool
# Fs.read_text(p) read a whole file as a string -> string (null on error)
# Fs.write_text(p, s) write a string (atomic tmp+rename) -> bool
# Fs.append_text(p, s) append a string -> bool
# Fs.remove(p) delete a file -> bool
# Fs.size(p) file size in bytes -> int (-1 on error)
# Fs.mkdir(p) create a directory (and its parents) -> bool
# Fs.copy(src, dst) copy a file, byte-for-byte -> bool
# Fs.list(dir) directory entries, sorted, stable -> []string
#
# Mime.of(path) MIME type from the file extension -> string
# Mime.sniff(path) ...refined by magic bytes -> string
#
# Errors are surfaced as values, never crashes: a fallible call returns null / ""
# / false / -1 that the caller can branch on (a first-class try/else lands with
# the error-handling work). Determinism: Fs.list is sorted, so a directory walk
# is reproducible across runs and platforms.
#
# Coverage (v1): paths use "/" and the native (macOS/BSD) filesystem — the fully
# supported target today. Windows separators, a sandboxed virtual FS for wasm,
# recursive directory copy, and richer magic-byte sniffing are follow-ups. Text
# helpers are UTF-8 (they tie into Unicode.*); write_text is atomic (tmp+rename)
# so a crash mid-write never corrupts the previous file.
function is_fs_ns(meth: pointer) -> bool {
if (meth == "exists") or (meth == "is_dir") or (meth == "read_text") { return true }
if (meth == "write_text") or (meth == "append_text") or (meth == "remove") { return true }
if (meth == "size") or (meth == "mkdir") or (meth == "copy") or (meth == "list") { return true }
return false
}
function is_path_ns(meth: pointer) -> bool {
if (meth == "join") or (meth == "dir") or (meth == "base") { return true }
if (meth == "ext") or (meth == "stem") or (meth == "normalize") { return true }
return false
}
function is_mime_ns(meth: pointer) -> bool {
if (meth == "of") or (meth == "sniff") { return true }
return false
}
function emit_fs_ns(meth: pointer, e: Node) -> Val {
g_uses_fsrt = true
let a = emit_expr(e.kids[0])
if (meth == "exists") { return val(emit_bind(`call i32 @fn_fs_exists(ptr {a.code})`), "bool") }
if (meth == "is_dir") { return val(emit_bind(`call i32 @fn_fs_is_dir(ptr {a.code})`), "bool") }
if (meth == "read_text") { return val(emit_bind(`call ptr @fn_fs_read_text(ptr {a.code})`), "string") }
if (meth == "remove") { return val(emit_bind(`call i32 @fn_fs_remove(ptr {a.code})`), "bool") }
if (meth == "size") { return val(emit_bind(`call i32 @fn_fs_size(ptr {a.code})`), "int") }
if (meth == "mkdir") { return val(emit_bind(`call i32 @fn_fs_mkdir(ptr {a.code})`), "bool") }
if (meth == "list") { return val(emit_bind(`call ptr @fn_fs_list(ptr {a.code})`), "[]string") }
let b = emit_expr(e.kids[1])
if (meth == "write_text") { return val(emit_bind(`call i32 @fn_fs_write_text(ptr {a.code}, ptr {b.code})`), "bool") }
if (meth == "append_text") { return val(emit_bind(`call i32 @fn_fs_append_text(ptr {a.code}, ptr {b.code})`), "bool") }
# copy
return val(emit_bind(`call i32 @fn_fs_copy(ptr {a.code}, ptr {b.code})`), "bool")
}
function emit_path_ns(meth: pointer, e: Node) -> Val {
g_uses_fsrt = true
let a = emit_expr(e.kids[0])
if (meth == "dir") { return val(emit_bind(`call ptr @fn_path_dir(ptr {a.code})`), "string") }
if (meth == "base") { return val(emit_bind(`call ptr @fn_path_base(ptr {a.code})`), "string") }
if (meth == "ext") { return val(emit_bind(`call ptr @fn_path_ext(ptr {a.code})`), "string") }
if (meth == "stem") { return val(emit_bind(`call ptr @fn_path_stem(ptr {a.code})`), "string") }
if (meth == "normalize") { return val(emit_bind(`call ptr @fn_path_norm(ptr {a.code})`), "string") }
# join
let b = emit_expr(e.kids[1])
return val(emit_bind(`call ptr @fn_path_join(ptr {a.code}, ptr {b.code})`), "string")
}
function emit_mime_ns(meth: pointer, e: Node) -> Val {
g_uses_fsrt = true
let a = emit_expr(e.kids[0])
if (meth == "sniff") { return val(emit_bind(`call ptr @fn_mime_sniff(ptr {a.code})`), "string") }
return val(emit_bind(`call ptr @fn_mime_of(ptr {a.code})`), "string")
}
# emit_fs_prelude — the Fs/Path/Mime runtime, emitted once per program that uses
# any of the three namespaces (g_uses_fsrt). Pure libc + byte IR.
function emit_fs_prelude() -> void {
emith("declare i32 @access(ptr, i32)\n")
emith("declare i32 @mkdir(ptr, i32)\n")
emith("declare i32 @remove(ptr)\n")
emith("declare i32 @rename(ptr, ptr)\n")
emith("declare ptr @opendir(ptr)\n")
emith("declare ptr @readdir(ptr)\n")
emith("declare i32 @closedir(ptr)\n")
emit_fs_common()
emit_fs_path()
emit_fs_io()
emit_fs_dir()
emit_fs_mime()
}
# ---- shared helpers --------------------------------------------------------
function emit_fs_common() -> void {
# duplicate %n bytes of %s into a fresh NUL-terminated buffer
emith("define ptr @fn_fs_dup(ptr %s, i32 %n) {\n")
emith("entry:\n %nz = zext i32 %n to i64\n %t = add i64 %nz, 1\n %m = call ptr @malloc(i64 %t)\n call ptr @memcpy(ptr %m, ptr %s, i64 %nz)\n")
emith(" %end = getelementptr i8, ptr %m, i32 %n\n store i8 0, ptr %end\n ret ptr %m\n}\n")
emith("define ptr @fn_fs_strdup(ptr %s) {\n")
emith("entry:\n %l = call i64 @strlen(ptr %s)\n %li = trunc i64 %l to i32\n %r = call ptr @fn_fs_dup(ptr %s, i32 %li)\n ret ptr %r\n}\n")
# index of the last '/' in %s, or -1 if none
emith("define i32 @fn_fs_lastslash(ptr %s) {\n")
emith("entry:\n %ip = alloca i32\n %rp = alloca i32\n store i32 0, ptr %ip\n store i32 -1, ptr %rp\n br label %lp\n")
emith("lp:\n %i = load i32, ptr %ip\n %p = getelementptr i8, ptr %s, i32 %i\n %b = load i8, ptr %p\n %c = zext i8 %b to i32\n")
emith(" %z = icmp eq i32 %c, 0\n br i1 %z, label %done, label %go\n")
emith("go:\n %sl = icmp eq i32 %c, 47\n br i1 %sl, label %set, label %nx\n")
emith("set:\n store i32 %i, ptr %rp\n br label %nx\n")
emith("nx:\n %i1 = add i32 %i, 1\n store i32 %i1, ptr %ip\n br label %lp\n")
emith("done:\n %r = load i32, ptr %rp\n ret i32 %r\n}\n")
}
# ---- Path.* (pure string) --------------------------------------------------
function emit_fs_path() -> void {
# join(a, b): b absolute -> b; a empty -> b; b empty -> a; else a + "/" + b
# (avoiding a doubled separator when a already ends with one).
emith("define ptr @fn_path_join(ptr %a, ptr %b) {\n")
emith("entry:\n %la64 = call i64 @strlen(ptr %a)\n %la = trunc i64 %la64 to i32\n %lb64 = call i64 @strlen(ptr %b)\n %lb = trunc i64 %lb64 to i32\n")
emith(" %b0 = load i8, ptr %b\n %b0i = zext i8 %b0 to i32\n %babs = icmp eq i32 %b0i, 47\n br i1 %babs, label %retb, label %ka\n")
emith("retb:\n %rb = call ptr @fn_fs_strdup(ptr %b)\n ret ptr %rb\n")
emith("ka:\n %aemp = icmp eq i32 %la, 0\n br i1 %aemp, label %retb2, label %kb\n")
emith("retb2:\n %rb2 = call ptr @fn_fs_strdup(ptr %b)\n ret ptr %rb2\n")
emith("kb:\n %bemp = icmp eq i32 %lb, 0\n br i1 %bemp, label %reta, label %chk\n")
emith("reta:\n %ra = call ptr @fn_fs_strdup(ptr %a)\n ret ptr %ra\n")
emith("chk:\n %lam1 = sub i32 %la, 1\n %pe = getelementptr i8, ptr %a, i32 %lam1\n %ae = load i8, ptr %pe\n %aei = zext i8 %ae to i32\n %ends = icmp eq i32 %aei, 47\n")
emith(" %sep = select i1 %ends, i32 0, i32 1\n %tot = add i32 %la, %lb\n %tot2 = add i32 %tot, %sep\n %tot3 = add i32 %tot2, 1\n %totz = zext i32 %tot3 to i64\n %m = call ptr @malloc(i64 %totz)\n")
emith(" %laz = zext i32 %la to i64\n call ptr @memcpy(ptr %m, ptr %a, i64 %laz)\n")
# write separator if needed
emith(" br i1 %ends, label %nosep, label %wsep\n")
emith("wsep:\n %sp = getelementptr i8, ptr %m, i32 %la\n store i8 47, ptr %sp\n br label %after\n")
emith("nosep:\n br label %after\n")
emith("after:\n %boff = add i32 %la, %sep\n %dp = getelementptr i8, ptr %m, i32 %boff\n %lbz = zext i32 %lb to i64\n call ptr @memcpy(ptr %dp, ptr %b, i64 %lbz)\n")
emith(" %endoff = add i32 %boff, %lb\n %ep = getelementptr i8, ptr %m, i32 %endoff\n store i8 0, ptr %ep\n ret ptr %m\n}\n")
# base(p): the component after the last '/', or p itself
emith("define ptr @fn_path_base(ptr %s) {\n")
emith("entry:\n %ls = call i32 @fn_fs_lastslash(ptr %s)\n %none = icmp eq i32 %ls, -1\n br i1 %none, label %whole, label %tail\n")
emith("whole:\n %r = call ptr @fn_fs_strdup(ptr %s)\n ret ptr %r\n")
emith("tail:\n %st = add i32 %ls, 1\n %p = getelementptr i8, ptr %s, i32 %st\n %r2 = call ptr @fn_fs_strdup(ptr %p)\n ret ptr %r2\n}\n")
# dir(p): everything before the last '/', or "." if none; "/" stays "/"
emith("define ptr @fn_path_dir(ptr %s) {\n")
emith("entry:\n %ls = call i32 @fn_fs_lastslash(ptr %s)\n %none = icmp eq i32 %ls, -1\n br i1 %none, label %dot, label %chk0\n")
emith("dot:\n %d = call ptr @fn_fs_strdup(ptr @fn_str_dot)\n ret ptr %d\n")
emith("chk0:\n %isroot = icmp eq i32 %ls, 0\n br i1 %isroot, label %root, label %cut\n")
emith("root:\n %r = call ptr @fn_fs_strdup(ptr @fn_str_slash)\n ret ptr %r\n")
emith("cut:\n %r2 = call ptr @fn_fs_dup(ptr %s, i32 %ls)\n ret ptr %r2\n}\n")
# ext(p): from the last '.' in the base component to the end, incl. the dot;
# "" when the base has no '.' or begins with '.' (a dotfile has no extension)
emith("define ptr @fn_path_ext(ptr %s) {\n")
emith("entry:\n %ls = call i32 @fn_fs_lastslash(ptr %s)\n %bstart = add i32 %ls, 1\n") # ls=-1 -> bstart=0
emith(" %dp = alloca i32\n %ip = alloca i32\n store i32 -1, ptr %dp\n store i32 %bstart, ptr %ip\n br label %lp\n")
emith("lp:\n %i = load i32, ptr %ip\n %p = getelementptr i8, ptr %s, i32 %i\n %b = load i8, ptr %p\n %c = zext i8 %b to i32\n %z = icmp eq i32 %c, 0\n br i1 %z, label %done, label %go\n")
emith("go:\n %dot = icmp eq i32 %c, 46\n br i1 %dot, label %sd, label %nx\n")
emith("sd:\n store i32 %i, ptr %dp\n br label %nx\n")
emith("nx:\n %i1 = add i32 %i, 1\n store i32 %i1, ptr %ip\n br label %lp\n")
emith("done:\n %d = load i32, ptr %dp\n %nod = icmp eq i32 %d, -1\n br i1 %nod, label %empty, label %chkpos\n")
emith("empty:\n %e = call ptr @fn_fs_strdup(ptr @fn_str_empty)\n ret ptr %e\n")
emith("chkpos:\n %atstart = icmp eq i32 %d, %bstart\n br i1 %atstart, label %empty2, label %take\n")
emith("empty2:\n %e2 = call ptr @fn_fs_strdup(ptr @fn_str_empty)\n ret ptr %e2\n")
emith("take:\n %pp = getelementptr i8, ptr %s, i32 %d\n %r = call ptr @fn_fs_strdup(ptr %pp)\n ret ptr %r\n}\n")
# stem(p): the base component without its extension
emith("define ptr @fn_path_stem(ptr %s) {\n")
emith("entry:\n %base = call ptr @fn_path_base(ptr %s)\n %ext = call ptr @fn_path_ext(ptr %s)\n")
emith(" %bl64 = call i64 @strlen(ptr %base)\n %bl = trunc i64 %bl64 to i32\n %el64 = call i64 @strlen(ptr %ext)\n %el = trunc i64 %el64 to i32\n")
emith(" %keep = sub i32 %bl, %el\n %r = call ptr @fn_fs_dup(ptr %base, i32 %keep)\n ret ptr %r\n}\n")
emit_fs_normalize()
}
# normalize(p): collapse duplicate '/', drop "." segments, and resolve ".." by
# popping the previous kept segment (never above an absolute root). Preserves a
# leading '/'. An empty result becomes ".".
function emit_fs_normalize() -> void {
emith("define ptr @fn_path_norm(ptr %s) {\n")
emith("entry:\n %len64 = call i64 @strlen(ptr %s)\n %len = trunc i64 %len64 to i32\n %cap = add i32 %len, 2\n %capz = zext i32 %cap to i64\n")
emith(" %out = call ptr @malloc(i64 %capz)\n")
# segst holds output offsets (i32) of each kept segment's start; size cap ints
emith(" %stz = mul i32 %cap, 4\n %stzz = zext i32 %stz to i64\n %segst = call ptr @malloc(i64 %stzz)\n")
emith(" %b0 = load i8, ptr %s\n %b0i = zext i8 %b0 to i32\n %abs = icmp eq i32 %b0i, 47\n")
emith(" %ip = alloca i32\n %op = alloca i32\n %scp = alloca i32\n store i32 0, ptr %ip\n store i32 0, ptr %scp\n")
emith(" br i1 %abs, label %ldr, label %noldr\n")
emith("ldr:\n store i8 47, ptr %out\n store i32 1, ptr %op\n br label %seg\n")
emith("noldr:\n store i32 0, ptr %op\n br label %seg\n")
emith("seg:\n br label %sksl\n")
# skip leading slashes between segments
emith("sksl:\n %i = load i32, ptr %ip\n %pp = getelementptr i8, ptr %s, i32 %i\n %cc = load i8, ptr %pp\n %cci = zext i8 %cc to i32\n %issl = icmp eq i32 %cci, 47\n br i1 %issl, label %adv, label %segstart\n")
emith("adv:\n %i2 = add i32 %i, 1\n store i32 %i2, ptr %ip\n br label %sksl\n")
# gather one segment [sstart, send)
emith("segstart:\n %ss = load i32, ptr %ip\n br label %scan\n")
emith("scan:\n %j = load i32, ptr %ip\n %pj = getelementptr i8, ptr %s, i32 %j\n %cj = load i8, ptr %pj\n %cji = zext i8 %cj to i32\n %endc = icmp eq i32 %cji, 0\n %slc = icmp eq i32 %cji, 47\n %stop = or i1 %endc, %slc\n br i1 %stop, label %seghave, label %scanadv\n")
emith("scanadv:\n %j1 = add i32 %j, 1\n store i32 %j1, ptr %ip\n br label %scan\n")
emith("seghave:\n %se = load i32, ptr %ip\n %slen = sub i32 %se, %ss\n %emptyseg = icmp eq i32 %slen, 0\n br i1 %emptyseg, label %atend, label %classify\n")
# empty segment only happens at the very end (trailing slashes) -> finish
emith("classify:\n")
# is it "." ? (len 1, char '.')
emith(" %is1 = icmp eq i32 %slen, 1\n %c0p = getelementptr i8, ptr %s, i32 %ss\n %c0 = load i8, ptr %c0p\n %c0i = zext i8 %c0 to i32\n %isdotchar = icmp eq i32 %c0i, 46\n %isdot = and i1 %is1, %isdotchar\n br i1 %isdot, label %contseg, label %chkdd\n")
# is it ".." ?
emith("chkdd:\n %is2 = icmp eq i32 %slen, 2\n %d0p = getelementptr i8, ptr %s, i32 %ss\n %d0 = load i8, ptr %d0p\n %d0i = zext i8 %d0 to i32\n %d1o = add i32 %ss, 1\n %d1p = getelementptr i8, ptr %s, i32 %d1o\n %d1 = load i8, ptr %d1p\n %d1i = zext i8 %d1 to i32\n")
emith(" %dd0 = icmp eq i32 %d0i, 46\n %dd1 = icmp eq i32 %d1i, 46\n %ddx = and i1 %dd0, %dd1\n %isdd = and i1 %is2, %ddx\n br i1 %isdd, label %dotdot, label %keepseg\n")
# ".." : pop a segment if we have one, else (relative) keep it literally
emith("dotdot:\n %sc = load i32, ptr %scp\n %has = icmp sgt i32 %sc, 0\n br i1 %has, label %pop, label %chkrel\n")
emith("pop:\n %sc1 = sub i32 %sc, 1\n %stp = getelementptr i32, ptr %segst, i32 %sc1\n %newop = load i32, ptr %stp\n store i32 %newop, ptr %op\n store i32 %sc1, ptr %scp\n br label %contseg\n")
emith("chkrel:\n br i1 %abs, label %contseg, label %keepseg\n") # absolute: drop; relative: keep ".."
# keep the segment: record its start, append it + a trailing '/'
emith("keepseg:\n %sc2 = load i32, ptr %scp\n %o0 = load i32, ptr %op\n %stp2 = getelementptr i32, ptr %segst, i32 %sc2\n store i32 %o0, ptr %stp2\n %sc2n = add i32 %sc2, 1\n store i32 %sc2n, ptr %scp\n")
emith(" %cpp = alloca i32\n store i32 %ss, ptr %cpp\n br label %cpy\n")
emith("cpy:\n %k = load i32, ptr %cpp\n %klt = icmp slt i32 %k, %se\n br i1 %klt, label %cpyb, label %cpysl\n")
emith("cpyb:\n %skp = getelementptr i8, ptr %s, i32 %k\n %sk = load i8, ptr %skp\n %oo = load i32, ptr %op\n %dkp = getelementptr i8, ptr %out, i32 %oo\n store i8 %sk, ptr %dkp\n %oo1 = add i32 %oo, 1\n store i32 %oo1, ptr %op\n %k1 = add i32 %k, 1\n store i32 %k1, ptr %cpp\n br label %cpy\n")
emith("cpysl:\n %oc = load i32, ptr %op\n %scp3 = getelementptr i8, ptr %out, i32 %oc\n store i8 47, ptr %scp3\n %oc1 = add i32 %oc, 1\n store i32 %oc1, ptr %op\n br label %contseg\n")
emith("contseg:\n %ci = load i32, ptr %ip\n %cip = getelementptr i8, ptr %s, i32 %ci\n %cic = load i8, ptr %cip\n %cici = zext i8 %cic to i32\n %atz = icmp eq i32 %cici, 0\n br i1 %atz, label %finish, label %seg\n")
emith("atend:\n br label %finish\n")
# trim a trailing '/' (unless the whole result is just "/"), then NUL-terminate
emith("finish:\n %fo = load i32, ptr %op\n %gt1 = icmp sgt i32 %fo, 1\n br i1 %gt1, label %trimchk, label %fdefault\n")
emith("trimchk:\n %lasto = sub i32 %fo, 1\n %lop = getelementptr i8, ptr %out, i32 %lasto\n %lc = load i8, ptr %lop\n %lci = zext i8 %lc to i32\n %istsl = icmp eq i32 %lci, 47\n br i1 %istsl, label %trim, label %term\n")
emith("trim:\n store i32 %lasto, ptr %op\n br label %term\n")
emith("fdefault:\n br label %term\n")
emith("term:\n %eo = load i32, ptr %op\n %ez = icmp eq i32 %eo, 0\n br i1 %ez, label %emptyout, label %putnul\n")
emith("emptyout:\n store i8 46, ptr %out\n %e1 = getelementptr i8, ptr %out, i32 1\n store i8 0, ptr %e1\n ret ptr %out\n")
emith("putnul:\n %ep = getelementptr i8, ptr %out, i32 %eo\n store i8 0, ptr %ep\n ret ptr %out\n}\n")
}
# ---- Fs.* (libc) -----------------------------------------------------------
function emit_fs_io() -> void {
emith("define i32 @fn_fs_exists(ptr %p) {\n")
emith("entry:\n %r = call i32 @access(ptr %p, i32 0)\n %ok = icmp eq i32 %r, 0\n %z = zext i1 %ok to i32\n ret i32 %z\n}\n")
# is_dir: opendir succeeds iff it is a directory
emith("define i32 @fn_fs_is_dir(ptr %p) {\n")
emith("entry:\n %d = call ptr @opendir(ptr %p)\n %nz = icmp ne ptr %d, null\n br i1 %nz, label %yes, label %no\n")
emith("yes:\n call i32 @closedir(ptr %d)\n ret i32 1\n")
emith("no:\n ret i32 0\n}\n")
# size: bytes via fseek/ftell, or -1 if it cannot be opened
emith("define i32 @fn_fs_size(ptr %p) {\n")
emith("entry:\n %f = call ptr @fopen(ptr %p, ptr @fn_str_rb)\n %nz = icmp ne ptr %f, null\n br i1 %nz, label %ok, label %bad\n")
emith("bad:\n ret i32 -1\n")
emith("ok:\n call i32 @fseek(ptr %f, i64 0, i32 2)\n %n = call i64 @ftell(ptr %f)\n call i32 @fclose(ptr %f)\n %ni = trunc i64 %n to i32\n ret i32 %ni\n}\n")
# readall: whole file into a fresh buffer; store byte length to %lenout; null on
# failure. The buffer is NUL-terminated (one past the length) so text callers
# can use it directly while binary callers use the length.
emith("define ptr @fn_fs_readall(ptr %p, ptr %lenout) {\n")
emith("entry:\n store i32 0, ptr %lenout\n %f = call ptr @fopen(ptr %p, ptr @fn_str_rb)\n %nz = icmp ne ptr %f, null\n br i1 %nz, label %ok, label %bad\n")
emith("bad:\n ret ptr null\n")
emith("ok:\n call i32 @fseek(ptr %f, i64 0, i32 2)\n %n64 = call i64 @ftell(ptr %f)\n call i32 @fseek(ptr %f, i64 0, i32 0)\n %n = trunc i64 %n64 to i32\n")
emith(" %cap = add i64 %n64, 1\n %m = call ptr @malloc(i64 %cap)\n %rd = call i64 @fread(ptr %m, i64 1, i64 %n64, ptr %f)\n call i32 @fclose(ptr %f)\n")
emith(" %rdi = trunc i64 %rd to i32\n %endp = getelementptr i8, ptr %m, i32 %rdi\n store i8 0, ptr %endp\n store i32 %rdi, ptr %lenout\n ret ptr %m\n}\n")
emith("define ptr @fn_fs_read_text(ptr %p) {\n")
emith("entry:\n %lp = alloca i32\n %r = call ptr @fn_fs_readall(ptr %p, ptr %lp)\n ret ptr %r\n}\n")
# write_text: write to "<p>.tmp" then rename over %p, so a crash mid-write
# never truncates the previous file. Returns 1 on success.
emith("define i32 @fn_fs_write_text(ptr %p, ptr %s) {\n")
emith("entry:\n %tmp = call ptr @fn_path_join_ext(ptr %p, ptr @fn_str_dottmp)\n %f = call ptr @fopen(ptr %tmp, ptr @fn_str_wb)\n %nz = icmp ne ptr %f, null\n br i1 %nz, label %ok, label %bad\n")
emith("bad:\n ret i32 0\n")
emith("ok:\n %n = call i64 @strlen(ptr %s)\n %w = call i64 @fwrite(ptr %s, i64 1, i64 %n, ptr %f)\n call i32 @fclose(ptr %f)\n")
emith(" %rr = call i32 @rename(ptr %tmp, ptr %p)\n %ok2 = icmp eq i32 %rr, 0\n %z = zext i1 %ok2 to i32\n ret i32 %z\n}\n")
# concat two strings (used to build "<p>.tmp"); local so write_text needs no
# dependency on the Os prelude
emith("define ptr @fn_path_join_ext(ptr %a, ptr %b) {\n")
emith("entry:\n %la = call i64 @strlen(ptr %a)\n %lb = call i64 @strlen(ptr %b)\n %sum = add i64 %la, %lb\n %tot = add i64 %sum, 1\n %m = call ptr @malloc(i64 %tot)\n")
emith(" call ptr @memcpy(ptr %m, ptr %a, i64 %la)\n %m2 = getelementptr i8, ptr %m, i64 %la\n call ptr @memcpy(ptr %m2, ptr %b, i64 %lb)\n %ep = getelementptr i8, ptr %m, i64 %sum\n store i8 0, ptr %ep\n ret ptr %m\n}\n")
emith("define i32 @fn_fs_append_text(ptr %p, ptr %s) {\n")
emith("entry:\n %f = call ptr @fopen(ptr %p, ptr @fn_str_ab)\n %nz = icmp ne ptr %f, null\n br i1 %nz, label %ok, label %bad\n")
emith("bad:\n ret i32 0\n")
emith("ok:\n %n = call i64 @strlen(ptr %s)\n call i64 @fwrite(ptr %s, i64 1, i64 %n, ptr %f)\n call i32 @fclose(ptr %f)\n ret i32 1\n}\n")
emith("define i32 @fn_fs_remove(ptr %p) {\n")
emith("entry:\n %r = call i32 @remove(ptr %p)\n %ok = icmp eq i32 %r, 0\n %z = zext i1 %ok to i32\n ret i32 %z\n}\n")
# copy: byte-for-byte via readall + a sized write. Returns 1 on success.
emith("define i32 @fn_fs_copy(ptr %src, ptr %dst) {\n")
emith("entry:\n %lp = alloca i32\n %buf = call ptr @fn_fs_readall(ptr %src, ptr %lp)\n %nz = icmp ne ptr %buf, null\n br i1 %nz, label %ok, label %bad\n")
emith("bad:\n ret i32 0\n")
emith("ok:\n %tmp = call ptr @fn_path_join_ext(ptr %dst, ptr @fn_str_dottmp)\n %f = call ptr @fopen(ptr %tmp, ptr @fn_str_wb)\n %fnz = icmp ne ptr %f, null\n br i1 %fnz, label %w, label %bad\n")
emith("w:\n %n = load i32, ptr %lp\n %nz64 = zext i32 %n to i64\n call i64 @fwrite(ptr %buf, i64 1, i64 %nz64, ptr %f)\n call i32 @fclose(ptr %f)\n %rr = call i32 @rename(ptr %tmp, ptr %dst)\n %ok2 = icmp eq i32 %rr, 0\n %z = zext i1 %ok2 to i32\n ret i32 %z\n}\n")
# mkdir: create %p and any missing parents (mkdir -p). Returns 1 if the
# directory exists afterwards. Intermediate EEXIST errors are ignored.
emith("define i32 @fn_fs_mkdir(ptr %p) {\n")
emith("entry:\n %dup = call ptr @fn_fs_strdup(ptr %p)\n %ip = alloca i32\n store i32 1, ptr %ip\n br label %lp\n")
emith("lp:\n %i = load i32, ptr %ip\n %pp = getelementptr i8, ptr %dup, i32 %i\n %c = load i8, ptr %pp\n %ci = zext i8 %c to i32\n %z = icmp eq i32 %ci, 0\n br i1 %z, label %fin, label %go\n")
emith("go:\n %sl = icmp eq i32 %ci, 47\n br i1 %sl, label %cut, label %nx\n")
emith("cut:\n store i8 0, ptr %pp\n call i32 @mkdir(ptr %dup, i32 493)\n store i8 47, ptr %pp\n br label %nx\n")
emith("nx:\n %i1 = add i32 %i, 1\n store i32 %i1, ptr %ip\n br label %lp\n")
emith("fin:\n call i32 @mkdir(ptr %dup, i32 493)\n %r = call i32 @fn_fs_is_dir(ptr %p)\n ret i32 %r\n}\n")
}
# ---- Fs.list (+ sort) ------------------------------------------------------
function emit_fs_dir() -> void {
# list(dir) -> []string of entries (excluding "." and ".."), sorted ascending
# by byte value for a stable, reproducible order. Each name is copied out of
# the readdir buffer before the next call. macOS/BSD dirent: d_name at offset
# 21 (documented native layout).
emith("define ptr @fn_fs_list(ptr %path) {\n")
emith("entry:\n %h = call ptr @malloc(i64 16)\n %d0 = getelementptr inbounds %LSlice, ptr %h, i32 0, i32 0\n %d1 = getelementptr inbounds %LSlice, ptr %h, i32 0, i32 1\n %d2 = getelementptr inbounds %LSlice, ptr %h, i32 0, i32 2\n")
emith(" %datap = alloca ptr\n %cntp = alloca i32\n %capp = alloca i32\n %init = call ptr @malloc(i64 128)\n store ptr %init, ptr %datap\n store i32 0, ptr %cntp\n store i32 16, ptr %capp\n")
emith(" %dir = call ptr @opendir(ptr %path)\n %dnz = icmp ne ptr %dir, null\n br i1 %dnz, label %rd, label %empty\n")
emith("rd:\n %de = call ptr @readdir(ptr %dir)\n %denz = icmp ne ptr %de, null\n br i1 %denz, label %ent, label %closed\n")
emith("ent:\n %namep = getelementptr i8, ptr %de, i32 21\n")
# skip "." and ".."
emith(" %n0 = load i8, ptr %namep\n %n0i = zext i8 %n0 to i32\n %isdot0 = icmp eq i32 %n0i, 46\n br i1 %isdot0, label %chkdots, label %keep\n")
emith("chkdots:\n %n1p = getelementptr i8, ptr %namep, i32 1\n %n1 = load i8, ptr %n1p\n %n1i = zext i8 %n1 to i32\n %n1z = icmp eq i32 %n1i, 0\n br i1 %n1z, label %rd, label %chkdd\n") # "." -> skip
emith("chkdd:\n %isdot1 = icmp eq i32 %n1i, 46\n br i1 %isdot1, label %chkdd2, label %keep\n")
emith("chkdd2:\n %n2p = getelementptr i8, ptr %namep, i32 2\n %n2 = load i8, ptr %n2p\n %n2i = zext i8 %n2 to i32\n %n2z = icmp eq i32 %n2i, 0\n br i1 %n2z, label %rd, label %keep\n") # ".." -> skip
emith("keep:\n %nm = call ptr @fn_fs_strdup(ptr %namep)\n")
# grow if full
emith(" %cnt = load i32, ptr %cntp\n %cap = load i32, ptr %capp\n %full = icmp sge i32 %cnt, %cap\n br i1 %full, label %grow, label %put\n")
emith("grow:\n %nc = mul i32 %cap, 2\n store i32 %nc, ptr %capp\n %ncz = zext i32 %nc to i64\n %nb = mul i64 %ncz, 8\n %old = load ptr, ptr %datap\n %new = call ptr @realloc(ptr %old, i64 %nb)\n store ptr %new, ptr %datap\n br label %put\n")
emith("put:\n %data = load ptr, ptr %datap\n %cnt2 = load i32, ptr %cntp\n %slot = getelementptr ptr, ptr %data, i32 %cnt2\n store ptr %nm, ptr %slot\n %cnt3 = add i32 %cnt2, 1\n store i32 %cnt3, ptr %cntp\n br label %rd\n")
emith("closed:\n call i32 @closedir(ptr %dir)\n br label %sortit\n")
emith("empty:\n br label %sortit\n")
# insertion sort the ptr array by strcmp
emith("sortit:\n %fdata = load ptr, ptr %datap\n %fcnt = load i32, ptr %cntp\n %aip = alloca i32\n store i32 1, ptr %aip\n br label %so\n")
emith("so:\n %ai = load i32, ptr %aip\n %ailt = icmp slt i32 %ai, %fcnt\n br i1 %ailt, label %sob, label %sod\n")
emith("sob:\n %kp = getelementptr ptr, ptr %fdata, i32 %ai\n %key = load ptr, ptr %kp\n %jp = alloca i32\n %aim1 = sub i32 %ai, 1\n store i32 %aim1, ptr %jp\n br label %si\n")
emith("si:\n %jj = load i32, ptr %jp\n %jge = icmp sge i32 %jj, 0\n br i1 %jge, label %sic, label %sins\n")
emith("sic:\n %ejp = getelementptr ptr, ptr %fdata, i32 %jj\n %ej = load ptr, ptr %ejp\n %cmp = call i32 @strcmp(ptr %ej, ptr %key)\n %gt = icmp sgt i32 %cmp, 0\n br i1 %gt, label %shift, label %sins\n")
emith("shift:\n %j1 = add i32 %jj, 1\n %dp1 = getelementptr ptr, ptr %fdata, i32 %j1\n store ptr %ej, ptr %dp1\n %jm = sub i32 %jj, 1\n store i32 %jm, ptr %jp\n br label %si\n")
emith("sins:\n %jf = load i32, ptr %jp\n %jf1 = add i32 %jf, 1\n %insp = getelementptr ptr, ptr %fdata, i32 %jf1\n store ptr %key, ptr %insp\n %ai1 = add i32 %ai, 1\n store i32 %ai1, ptr %aip\n br label %so\n")
emith("sod:\n store ptr %fdata, ptr %d0\n store i32 %fcnt, ptr %d1\n store i32 %fcnt, ptr %d2\n ret ptr %h\n}\n")
}
# ---- Mime.* ----------------------------------------------------------------
function emit_fs_mime() -> void {
# the extension -> MIME table, as parallel lists. Kept small and documented;
# unknown extensions fall through to application/octet-stream.
let exts = new []pointer; let tys = new []pointer
push(exts, "png"); push(tys, "image/png")
push(exts, "jpg"); push(tys, "image/jpeg")
push(exts, "jpeg"); push(tys, "image/jpeg")
push(exts, "gif"); push(tys, "image/gif")
push(exts, "bmp"); push(tys, "image/bmp")
push(exts, "webp"); push(tys, "image/webp")
push(exts, "svg"); push(tys, "image/svg+xml")
push(exts, "txt"); push(tys, "text/plain")
push(exts, "md"); push(tys, "text/markdown")
push(exts, "csv"); push(tys, "text/csv")
push(exts, "html"); push(tys, "text/html")
push(exts, "htm"); push(tys, "text/html")
push(exts, "css"); push(tys, "text/css")
push(exts, "js"); push(tys, "text/javascript")
push(exts, "json"); push(tys, "application/json")
push(exts, "xml"); push(tys, "application/xml")
push(exts, "zip"); push(tys, "application/zip")
push(exts, "pdf"); push(tys, "application/pdf")
push(exts, "wav"); push(tys, "audio/wav")
push(exts, "ogg"); push(tys, "audio/ogg")
push(exts, "mp3"); push(tys, "audio/mpeg")
push(exts, "ttf"); push(tys, "font/ttf")
push(exts, "otf"); push(tys, "font/otf")
push(exts, "ludic"); push(tys, "text/x-ludic")
# create the string constants FIRST (as module globals), then reference them
let en = new []pointer; let tn = new []pointer
var i = 0
while i < len(exts) { push(en, emit_str_const(exts[i])); push(tn, emit_str_const(tys[i])); i = i + 1 }
let k_octet = emit_str_const("application/octet-stream")
let n = len(exts)
# the lookup table: an array of { extension, type } string-pointer pairs
emith(`@mime_tbl = private unnamed_addr constant [{itoa(n)} x {{ ptr, ptr }}] [`)
i = 0
while i < len(exts) {
if i > 0 { emith(", ") }
emith(`{{ ptr, ptr }} {{ ptr {en[i]}, ptr {tn[i]} }}`)
i = i + 1
}
emith("]\n")
# of(path): lowercased extension, then a linear scan of the table
emith("define ptr @fn_mime_of(ptr %path) {\n")
emith("entry:\n %ext = call ptr @fn_path_ext(ptr %path)\n %lc = call ptr @fn_mime_lc(ptr %ext)\n %ip = alloca i32\n store i32 0, ptr %ip\n br label %lp\n")
emith(`lp:\n %i = load i32, ptr %ip\n %lt = icmp slt i32 %i, {itoa(n)}\n br i1 %lt, label %body, label %def\n`)
emith(`body:\n %kp = getelementptr [{itoa(n)} x {{ ptr, ptr }}], ptr @mime_tbl, i32 0, i32 %i, i32 0\n %k = load ptr, ptr %kp\n %c = call i32 @strcmp(ptr %lc, ptr %k)\n %eq = icmp eq i32 %c, 0\n br i1 %eq, label %hit, label %nx\n`)
emith(`hit:\n %vp = getelementptr [{itoa(n)} x {{ ptr, ptr }}], ptr @mime_tbl, i32 0, i32 %i, i32 1\n %v = load ptr, ptr %vp\n %r = call ptr @fn_fs_strdup(ptr %v)\n ret ptr %r\n`)
emith("nx:\n %i1 = add i32 %i, 1\n store i32 %i1, ptr %ip\n br label %lp\n")
emith(`def:\n %d = call ptr @fn_fs_strdup(ptr {k_octet})\n ret ptr %d\n}}\n`)
# lowercase an extension, dropping a leading '.' (ASCII only, for table lookup)
emith("define ptr @fn_mime_lc(ptr %s) {\n")
emith("entry:\n %l64 = call i64 @strlen(ptr %s)\n %l = trunc i64 %l64 to i32\n %cap = add i64 %l64, 1\n %out = call ptr @malloc(i64 %cap)\n")
emith(" %b0 = load i8, ptr %s\n %b0i = zext i8 %b0 to i32\n %isdot = icmp eq i32 %b0i, 46\n %start = select i1 %isdot, i32 1, i32 0\n")
emith(" %ip = alloca i32\n %op = alloca i32\n store i32 %start, ptr %ip\n store i32 0, ptr %op\n br label %lp\n")
emith("lp:\n %i = load i32, ptr %ip\n %pp = getelementptr i8, ptr %s, i32 %i\n %c = load i8, ptr %pp\n %ci = zext i8 %c to i32\n %z = icmp eq i32 %ci, 0\n br i1 %z, label %done, label %go\n")
emith("go:\n %ua = icmp uge i32 %ci, 65\n %ub = icmp ule i32 %ci, 90\n %up = and i1 %ua, %ub\n %lo = add i32 %ci, 32\n %m = select i1 %up, i32 %lo, i32 %ci\n %mt = trunc i32 %m to i8\n %o = load i32, ptr %op\n %dp = getelementptr i8, ptr %out, i32 %o\n store i8 %mt, ptr %dp\n %o1 = add i32 %o, 1\n store i32 %o1, ptr %op\n %i1 = add i32 %i, 1\n store i32 %i1, ptr %ip\n br label %lp\n")
emith("done:\n %fo = load i32, ptr %op\n %ep = getelementptr i8, ptr %out, i32 %fo\n store i8 0, ptr %ep\n ret ptr %out\n}\n")
emit_fs_sniff()
}
# sniff(path): read the first bytes and recognise a few well-known signatures,
# otherwise fall back to the extension. Covers PNG/JPEG/GIF/PDF for now.
function emit_fs_sniff() -> void {
emith("define ptr @fn_mime_sniff(ptr %path) {\n")
emith("entry:\n %f = call ptr @fopen(ptr %path, ptr @fn_str_rb)\n %nz = icmp ne ptr %f, null\n br i1 %nz, label %ok, label %fallback\n")
emith("ok:\n %buf = call ptr @malloc(i64 16)\n %rd = call i64 @fread(ptr %buf, i64 1, i64 8, ptr %f)\n call i32 @fclose(ptr %f)\n %rdi = trunc i64 %rd to i32\n %has4 = icmp sge i32 %rdi, 4\n br i1 %has4, label %chk, label %fallback\n")
emith("chk:\n %b0p = getelementptr i8, ptr %buf, i32 0\n %b0 = load i8, ptr %b0p\n %b0i = zext i8 %b0 to i32\n %b1p = getelementptr i8, ptr %buf, i32 1\n %b1 = load i8, ptr %b1p\n %b1i = zext i8 %b1 to i32\n %b2p = getelementptr i8, ptr %buf, i32 2\n %b2 = load i8, ptr %b2p\n %b2i = zext i8 %b2 to i32\n %b3p = getelementptr i8, ptr %buf, i32 3\n %b3 = load i8, ptr %b3p\n %b3i = zext i8 %b3 to i32\n")
# PNG: 89 50 4E 47
emith(" %p0 = icmp eq i32 %b0i, 137\n %p1 = icmp eq i32 %b1i, 80\n %p2 = icmp eq i32 %b2i, 78\n %p3 = icmp eq i32 %b3i, 71\n %pa = and i1 %p0, %p1\n %pb = and i1 %pa, %p2\n %pc = and i1 %pb, %p3\n br i1 %pc, label %png, label %cj\n")
emith("png:\n %rpng = call ptr @fn_fs_strdup(ptr @fn_sig_png)\n ret ptr %rpng\n")
# JPEG: FF D8 FF
emith("cj:\n %j0 = icmp eq i32 %b0i, 255\n %j1 = icmp eq i32 %b1i, 216\n %j2 = icmp eq i32 %b2i, 255\n %ja = and i1 %j0, %j1\n %jb = and i1 %ja, %j2\n br i1 %jb, label %jpg, label %cg\n")
emith("jpg:\n %rjpg = call ptr @fn_fs_strdup(ptr @fn_sig_jpg)\n ret ptr %rjpg\n")
# GIF: 47 49 46
emith("cg:\n %g0 = icmp eq i32 %b0i, 71\n %g1 = icmp eq i32 %b1i, 73\n %g2 = icmp eq i32 %b2i, 70\n %ga = and i1 %g0, %g1\n %gb = and i1 %ga, %g2\n br i1 %gb, label %gif, label %cp\n")
emith("gif:\n %rgif = call ptr @fn_fs_strdup(ptr @fn_sig_gif)\n ret ptr %rgif\n")
# PDF: 25 50 44 46
emith("cp:\n %q0 = icmp eq i32 %b0i, 37\n %q1 = icmp eq i32 %b1i, 80\n %q2 = icmp eq i32 %b2i, 68\n %q3 = icmp eq i32 %b3i, 70\n %qa = and i1 %q0, %q1\n %qb = and i1 %qa, %q2\n %qc = and i1 %qb, %q3\n br i1 %qc, label %pdf, label %fallback\n")
emith("pdf:\n %rpdf = call ptr @fn_fs_strdup(ptr @fn_sig_pdf)\n ret ptr %rpdf\n")
emith("fallback:\n %r = call ptr @fn_mime_of(ptr %path)\n ret ptr %r\n}\n")
# the small string constants the Fs/Path/Mime runtime references
emith("@fn_str_rb = private unnamed_addr constant [3 x i8] c\"rb\\00\"\n")
emith("@fn_str_wb = private unnamed_addr constant [3 x i8] c\"wb\\00\"\n")
emith("@fn_str_ab = private unnamed_addr constant [3 x i8] c\"ab\\00\"\n")
emith("@fn_str_dot = private unnamed_addr constant [2 x i8] c\".\\00\"\n")
emith("@fn_str_slash = private unnamed_addr constant [2 x i8] c\"/\\00\"\n")
emith("@fn_str_empty = private unnamed_addr constant [1 x i8] c\"\\00\"\n")
emith("@fn_str_dottmp = private unnamed_addr constant [5 x i8] c\".tmp\\00\"\n")
emith("@fn_sig_png = private unnamed_addr constant [10 x i8] c\"image/png\\00\"\n")
emith("@fn_sig_jpg = private unnamed_addr constant [11 x i8] c\"image/jpeg\\00\"\n")
emith("@fn_sig_gif = private unnamed_addr constant [10 x i8] c\"image/gif\\00\"\n")
emith("@fn_sig_pdf = private unnamed_addr constant [16 x i8] c\"application/pdf\\00\"\n")
}
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