Historical internal name "uncommonlisp" retired in favor of the
public name "lumbda" ahead of lumbda.com going live. Scope of
this commit:
Source files renamed:
uncommonlisp.py -> lumbda.py
asm/uncommonlisp.s -> asm/lumbda.s
c/uncommonlisp.h -> c/lumbda.h
whitepaper/uncommonlisp-whitepaper -> whitepaper/lumbda-whitepaper (.rst + .pdf)
Binaries renamed (tracked ones; c/ was always gitignored):
asm/uncommonlisp, asm/uncommonlisp-gc, asm/uncommonlisp.o,
asm/uncommonlisp-gc.o -> asm/lumbda(-gc)(.o)
c/.gitignore -> ignores lumbda
Internal string updates (sed pass ordered longest-first):
asm/uncommonlisp -> asm/lumbda
c/uncommonlisp -> c/lumbda
uncommonlisp.py -> lumbda.py
UNCOMMONLISP_BIN -> LUMBDA_BIN (asm/test.sh env var)
"uncommonlisp> " -> "lumbda> " (asm REPL prompt baked into binary)
UNCOMMONLISP -> LUMBDA (macros, comments)
uncommonlisp -> lumbda (prose)
Binary portal magic updated:
"ULPORTAL" -> "LUMBDAB1" # "Lumbda Binary v1"
Old portal files are not backward-compatible — this is a deliberate
break since it's the rename moment. S-expression portals already
carry their own ";; lumbda-portal v1" header and remain cleanly
versioned.
WHITEPAPER.pdf / WHITEPAPER.rst symlinks repointed to the renamed
files. Makefile's whitepaper target targets lumbda-whitepaper.pdf.
Not changed (intentional, separate phases):
- Filesystem directory /home/fox/git/uncommonlisp itself
(fox renames locally and the gitlab repo URL in a follow-up)
- tests.py hardcoded cwd=/home/fox/git/uncommonlisp
(matches the current on-disk location; will flip when the
directory rename ships)
- Git history (immutable; old commits still say uncommonlisp,
which is correct — that's what they were)
Verified:
137 asm no-GC + 137 asm GC + 571 Python + 83 C + 189 shared
functional tests all pass under the new names.
bench-gc-http (2000 req): all 4 cells behave as expected
(cells 1/2 flat, 3 leaks, 4 bounded at 1 chunk).
Python REPL, C REPL, asm REPL all start cleanly.
Adds a second asm build (asm/uncommonlisp-gc) behind the GC_NAIVE
assembler flag, providing the benchmark baseline we previously had
no data for. Same binary, same surface, different allocator:
- 8-byte header per heap block (size << 1 | mark), placed at -8
from the tagged pointer so existing untag + offset accesses
stay unchanged.
- Chunk list tracked in a side array, letting sweep walk every
mmap'd region by header-chained blocks instead of guessing.
- Free list rebuilt each sweep, first-fit alloc with split on
large-leftover (>= 24 bytes).
- Mark phase enumerates five root classes: %r14 (global env,
untagged chain), sym_else_val, sym_table entries, every
sym_hash_bucket chain, and a conservative scan from current
%rsp to the initial stack_top captured at _start. The stack
scan runs twice per word — once as a tagged value, once as a
potential untagged env-node pointer (size-guarded to 24 bytes
so it can't walk off a wrong-size block).
- Transitive marking via an explicit 16K-entry mark stack;
gc_mark_env walks untagged env chains from %r14 and from every
closure's env field.
- heap_alloc preserves the non-GC ABI (only %rax clobbered) so
existing callers like bi_append, which holds state in %rcx
across make_pair, keep working.
- Overflow path uses check-then-write bumps and pads the old
chunk's tail with a single dead block before growing, so sweep
never walks into uninitialized mmap'd memory.
- HEAP_SIZE shrinks to 1 MB under GC_NAIVE so the collector
actually runs on ordinary workloads.
- Two diagnostic builtins in the GC build: (gc-collect) to force
a collection, (gc-stats) -> (collections . live-bytes).
Control-group bench (examples/bench-gc-memory.lsp, 2000 iterations
of build-sum-discard over 200-element lists, i5-8350U):
tier time_ms peak_rss final_rss
asm no-GC 1097 133.9 MB 133.9 MB (grows, never shrinks)
asm naive GC 1431 1.1 MB 1.1 MB (steady state)
124x less memory at a ~30% throughput cost. That is the number we
were guessing at before. Reproduce: make bench-gc.
Tests: 137 asm (no-GC) + 137 asm (GC) + 189 shared functional pass.
The two asm builds are tested independently via UNCOMMONLISP_BIN in
asm/test.sh; asm/Makefile now builds both and exposes a test-gc
target.
No C. No libc. Just Linux syscalls and machine instructions.
2592 lines of GNU assembler. 13KB stripped binary. 1.8MB resident.
Features: quote, if, define, set!, lambda, begin, let, named-let,
cond, and, or. 34 builtins. Tag-in-low-bits values. Bump allocator
on mmap'd pages. TCO via jmp. Symbol interning.
Runs: (fact 10)=3628800, (fib 35)=9227465, (ack 3 4)=125.
24 tests pass. Zero dependencies.
"If you vibe code in assembly, you don't even need a compiler."
