W5
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@ -845,28 +845,64 @@ worker URL, config default flips to wasm, native stays in-tree as
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reference.
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> **Status: DONE (2026-06-13).** W5 flips the page-render default to the WASM
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> backend while retaining explicit native fallback for host-owned surfaces not
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> yet promoted to membrane APIs (docs/compiler introspection, markdown/zip,
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> regex/xml/yaml, sqlite/tasks, file-write and legacy `unit_call`/`unit_render`
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> pages). The fallback is selected before workspace creation by scanning the
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> entry source for the small native-only token set, so unsupported pages do not
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> fail through wasm and do not hide as trap regressions. `scripts/wasm/run_w5.sh`
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> is the cutover gate: it measures native, switches `/etc/uce/settings.cfg` to
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> wasm, runs the wasm full suite with wasm kill tests, runs the starter subset,
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> runs the native-vs-wasm benchmark comparison, and can leave the backend enabled
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> with `UCE_W5_KEEP_BACKEND=1`. Final k-uce gate: native reference suite **83/83**;
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> wasm/default suite **85/85** (83 normal cases + loop/recurse kill pages; the old
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> raw OOB page is kept as a manual stress page because Wasmtime's signal-based
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> trap machinery conflicts with the native SIGILL/SIGSEGV recovery handler on
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> that particular fault); starter subset **14/14**; benchmark medians passed the
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> ≤2× budget: doc singlepage native 324.0ms vs wasm/fallback 317.9ms, sqlite
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> 3.7ms vs 3.8ms, starter dashboard 44.2ms vs wasm 6.1ms. Worker-internal probe
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> headers are emitted for wasm responses: `X-UCE-Wasm-Workspace-Birth-Us`,
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> component resolve count/total/avg, and `X-UCE-Backend: wasm`. Current warm
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> workspace birth is about 300–380µs on k-uce (above the original aspirational
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> 100µs CoW target, but page latency meets the W5 cutover budget); component
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> resolve avg is typically ~10µs. Live `/etc/uce/settings.cfg` was left with
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> `WASM_BACKEND_ENABLED=1`; native remains in-tree and config-selectable.
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> backend while retaining explicit native fallback for the surfaces still
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> genuinely host-owned: zip, sqlite, background tasks, filesystem writes,
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> sockets/sleep, and `unit_call`/compiler-introspection (the last need the
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> native toolchain). The fallback is selected before workspace creation by
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> scanning the entry source for a small native-only token set, so unsupported
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> pages neither fail through wasm nor hide as trap regressions.
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>
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> **Promoted onto wasm during W5** (no longer fallback): **regex** runs through
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> a single UCEB1-marshalled `uce_host_regex` hostcall against the host's PCRE2;
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> **markdown** is compiled into the core (pure compute); **xml/yaml** were
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> already in-core; **filesystem writes** (`file_put_contents`/`file_append`) go
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> through a policy-gated `uce_host_file_write` hostcall, and the read membrane
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> was widened to the same allowlist (site tree + scratch roots: `/tmp`,
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> `BIN_DIRECTORY`, `SESSION_PATH`, `TMP_UPLOAD_PATH`) so a page can read back
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> what it writes (e.g. the `io.uce` /tmp round-trip). The `/doc/*` blanket
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> fallback is gone — doc pages render on wasm. Two wasm-stack/ABI issues surfaced and were fixed: the core stack was
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> raised to 8 MB so recursive `ucb_decode_node` reaches the 1024 depth limit
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> like native (the core.uce depth-bomb negative test overflowed the small
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> default stack), and `wasm_trace`'s demangler is host-only (wasi-libc++ has no
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> `__cxa_demangle`, so a unit must not import it). Two backend robustness bugs
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> fixed: a failed wasm side-compile (e.g. try/catch units) is now non-fatal —
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> the native `.so` still serves and the stale `.wasm` is removed — and
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> `wasm_artifact_exists` now requires the artifact be newer than its source, so
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> a source edit can't be served from a stale `.wasm` (the wasm path bypasses the
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> native JIT recompile).
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>
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> **Signal-trap conflict resolved (this was open in the prior W5 draft):** a
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> guest `unreachable`/OOB used to surface as a host signal that the native
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> SIGILL/SIGSEGV handler caught and `abort()`'d the worker (502). `make_engine`
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> now sets `signals_based_traps(false)`, so guest traps are explicit and stay
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> pure wasm traps returned as errors. The `__builtin_trap()` kill page now
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> returns a clean 500 and the worker survives a kill barrage (0 PID churn); it
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> is back in the kill-test gate alongside loop/recurse.
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>
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> `scripts/wasm/run_w5.sh` is the cutover gate: measure native, switch
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> `/etc/uce/settings.cfg` to wasm, run the wasm full suite + kill tests +
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> starter subset + the native-vs-wasm benchmark, optionally leave the backend
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> enabled (`UCE_W5_KEEP_BACKEND=1`). Final k-uce gate: native reference suite
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> **83/83**; wasm/default full suite **83/83** warm (starter, docs, core tests,
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> markdown, regex all on wasm; zip/sqlite/tasks correctly on native fallback);
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> starter subset **14/14**; kill pages (trap/loop/recurse) clean with the worker
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> unharmed. Benchmark medians passed the ≤2× budget: doc singlepage native
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> ~324ms vs wasm ~318ms, sqlite 3.7ms vs 3.8ms, starter dashboard 44ms vs wasm
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> ~6ms. Worker-internal probe headers (`X-UCE-Backend`,
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> `X-UCE-Wasm-Workspace-Birth-Us`, component resolve count/total/avg) are emitted
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> for wasm responses when `WASM_BACKEND_VERBOSE=1`; warm workspace birth is
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> ~300–380µs on k-uce (above the aspirational 100µs CoW target — that and
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> placement memoization are the remaining perf items — but page latency meets the
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> cutover budget). Live `/etc/uce/settings.cfg` left with `WASM_BACKEND_ENABLED=1`;
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> native remains in-tree and config-selectable.
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>
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> **Still genuinely deferred (not W5-blocking):** sqlite/tasks/zip membrane
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> hostcalls (host-owned, native fallback works today; zip additionally can't be
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> a wasm side module while its `.uce` source uses try/catch), `unit_call` and
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> compiler/unit-introspection pages (need the native toolchain — candidates for
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> host-serviced hostcalls if native is ever to be fully retired), CoW snapshot
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> birth + placement memoization for the workspace-birth budget, and the §3.2
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> statics audit follow-through.
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**W6 — cleanup.**
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Cutover checklist gate 4, verbatim: re-home the spike-hosted gates
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@ -22,6 +22,7 @@ fi
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-Wl,--export=__heap_base \
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-Wl,--export=__stack_pointer \
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-Wl,--import-table \
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-Wl,-z,stack-size=8388608 \
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-Wl,--allow-undefined-file=src/wasm/core_hostcalls.syms \
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-Wl,--no-entry \
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$(sed "s/^/-Wl,--export-if-defined=/" src/wasm/core_libc_exports.syms | tr "\n" " ")
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@ -21,6 +21,10 @@ COMMON_FLAGS=(
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--target=wasm32-wasip1
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-fPIC -fvisibility=default -fvisibility-inlines-hidden
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-O1 -g -std=c++20
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# -w as in scripts/compile: warnings are not failures. The server captures
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# this script's output and treats any non-empty result as a compile failure
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# (then drops the .wasm), so a successful build must be silent.
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-w
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# must match the core build ABI: units with RTTI/EH enabled import
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# typeinfo/unwind symbols the -fno-rtti/-fno-exceptions core cannot provide
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-fno-exceptions -fno-rtti
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@ -244,7 +244,10 @@ RENDER(Request& context)
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trace_msg += "\nCaused by:\n wasm trap: call stack exhausted\n";
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WasmTraceSummary trace_summary = wasm_trace_summarize(trace_msg);
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String trace_text = wasm_trace_format(trace_summary);
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check("wasm_trace_summarize() collapse + demangle", trace_summary.parsed && trace_summary.total_frames == 41 && trace_summary.cause == "wasm trap: call stack exhausted" && trace_summary.frames.size() == 2 && contains(trace_text, "×40") && contains(trace_text, "recursion()"), trace_text);
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// Demangling is a host-only capability (wasi-libc++ has no __cxa_demangle),
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// so accept either the demangled name (native) or the raw symbol (wasm).
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bool trace_symbol_ok = contains(trace_text, "recursion()") || contains(trace_text, "_Z9recursionv");
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check("wasm_trace_summarize() collapse", trace_summary.parsed && trace_summary.total_frames == 41 && trace_summary.cause == "wasm trap: call stack exhausted" && trace_summary.frames.size() == 2 && contains(trace_text, "×40") && trace_symbol_ok, trace_text);
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String fault_msg = "error while executing at wasm backtrace:\n 0: 0x2a - <unknown>!<wasm function 0>\n\nCaused by:\n 0: memory fault at wasm address 0x20000 in linear memory of size 0x10000\n 1: wasm trap: out of bounds memory access\n";
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WasmTraceSummary fault_summary = wasm_trace_summarize(fault_msg);
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@ -860,13 +860,25 @@ void compile_shared_unit(Request* context, SharedUnit* su)
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));
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if(su->compiler_messages.length() == 0 && !su->opt_so_optional && compiler_wasm_unit_compile_enabled(context))
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su->compiler_messages = trim(shell_exec(shell_escape(compiler_wasm_compile_script(context))+" "+
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{
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// The wasm side-module build is best-effort: a unit that cannot compile
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// to wasm (e.g. try/catch) still works via the native .so and falls back
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// to native at request time. Record the failure, never fail the unit on
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// it. On failure, remove any stale .wasm so the backend won't serve it.
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String wasm_messages = trim(shell_exec(shell_escape(compiler_wasm_compile_script(context))+" "+
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shell_escape(su->src_path)+" "+
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shell_escape(su->bin_path)+" "+
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shell_escape(su->file_name)+" "+
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shell_escape(su->pre_file_name)+" "+
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shell_escape(su->wasm_file_name)
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));
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if(wasm_messages.length() > 0)
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{
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file_put_contents(su->wasm_check_file_name, wasm_messages + "\n");
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file_unlink(su->wasm_name);
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printf("(i) wasm side-module unavailable for %s (native .so serves it)\n", su->file_name.c_str());
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}
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}
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if(su->compiler_messages.length() > 0)
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{
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@ -642,41 +642,69 @@ StringList regex_split(String pattern, String subject, String flags)
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#else
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// PCRE2 is not compiled into the wasm core; regex runs host-side (the host
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// already links libpcre2). One UCEB1-marshalled hostcall carries the request
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// {op,pattern,subject,flags,replacement} in and the result tree out — the host
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// runs the real regex_* and packs the answer. See uce_host_regex in
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// src/wasm/worker.cpp.
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extern "C" size_t uce_host_regex(const char* in, size_t in_len, char* out, size_t cap);
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static DValue wasm_regex_call(String op, String pattern, String subject, String flags, String replacement = "")
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{
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DValue request;
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request["op"] = op;
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request["pattern"] = pattern;
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request["subject"] = subject;
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request["flags"] = flags;
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request["replacement"] = replacement;
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String encoded = ucb_encode(request);
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size_t need = uce_host_regex(encoded.data(), encoded.size(), 0, 0);
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if(need == 0)
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return(DValue());
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String buffer(need, 0);
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size_t got = uce_host_regex(encoded.data(), encoded.size(), &buffer[0], need);
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if(got == 0 || got > need)
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return(DValue());
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DValue response;
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String error;
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ucb_decode(String(buffer.data(), got), response, &error);
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return(response);
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}
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bool regex_match(String pattern, String subject, String flags)
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{
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(void)pattern; (void)subject; (void)flags;
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return(false);
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return(wasm_regex_call("match", pattern, subject, flags)["bool"].to_bool());
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}
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DValue regex_search(String pattern, String subject, String flags)
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{
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DValue result;
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result["matched"].set_bool(false);
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result["pattern"] = pattern;
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result["flags"] = flags == "" ? "default" : flags;
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return(result);
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DValue response = wasm_regex_call("search", pattern, subject, flags);
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DValue* tree = response.key("tree");
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return(tree ? *tree : DValue());
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}
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DValue regex_search_all(String pattern, String subject, String flags)
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{
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DValue result;
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result["matched"].set_bool(false);
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result["pattern"] = pattern;
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result["flags"] = flags == "" ? "default" : flags;
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result["count"] = (f64)0;
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return(result);
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DValue response = wasm_regex_call("search_all", pattern, subject, flags);
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DValue* tree = response.key("tree");
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return(tree ? *tree : DValue());
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}
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String regex_replace(String pattern, String replacement, String subject, String flags)
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{
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(void)pattern; (void)replacement; (void)flags;
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return(subject);
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return(wasm_regex_call("replace", pattern, subject, flags, replacement)["text"].to_string());
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}
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StringList regex_split(String pattern, String subject, String flags)
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{
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(void)pattern; (void)flags;
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return(StringList{ subject });
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DValue response = wasm_regex_call("split", pattern, subject, flags);
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StringList result;
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DValue* list = response.key("list");
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if(list)
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list->each([&](const DValue& part, String) {
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result.push_back(part.to_string());
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});
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return(result);
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}
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#endif
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@ -14,6 +14,8 @@ void uce_host_log(int level, const char* buf, size_t len);
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// cwd convention); file_read uses the length-query convention
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int uce_host_file_exists(const char* path, size_t path_len, const char* current, size_t current_len);
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size_t uce_host_file_read(const char* path, size_t path_len, const char* current, size_t current_len, char* buf, size_t cap);
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int uce_host_file_write(const char* path, size_t path_len, const char* current, size_t current_len, const char* content, size_t content_len, int append);
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void uce_host_file_unlink(const char* path, size_t path_len, const char* current, size_t current_len);
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}
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static String wasm_current_unit_file()
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@ -50,13 +52,25 @@ String file_get_contents(String file_name)
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content.resize(got <= required ? got : 0);
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return(content);
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}
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bool file_put_contents(String file_name, String content) { (void)file_name; (void)content; return(false); }
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bool file_append_contents(String file_name, String content) { (void)file_name; (void)content; return(false); }
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bool file_put_contents(String file_name, String content)
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{
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String current = wasm_current_unit_file();
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return(uce_host_file_write(file_name.data(), file_name.size(), current.data(), current.size(), content.data(), content.size(), 0) != 0);
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}
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bool file_append_contents(String file_name, String content)
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{
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String current = wasm_current_unit_file();
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return(uce_host_file_write(file_name.data(), file_name.size(), current.data(), current.size(), content.data(), content.size(), 1) != 0);
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}
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String cwd_get() { return("/"); }
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void cwd_set(String path) { (void)path; }
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String process_start_directory() { return("/"); }
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time_t file_mtime(String file_name) { (void)file_name; return(0); }
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void file_unlink(String file_name) { (void)file_name; }
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void file_unlink(String file_name)
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{
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String current = wasm_current_unit_file();
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uce_host_file_unlink(file_name.data(), file_name.size(), current.data(), current.size());
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}
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String expand_path(String path, String relative_to_path) { return(path_join(relative_to_path, path)); }
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StringList ls(String dir) { (void)dir; return(StringList()); }
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u64 config_map_u64(StringMap& cfg, String key, u64 fallback) { String raw = first(cfg[key], std::to_string(fallback)); char* end = 0; unsigned long long v = strtoull(raw.c_str(), &end, 10); return(end && *end == 0 ? (u64)v : fallback); }
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@ -12,6 +12,16 @@
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#include "uri.cpp"
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#include "cli.cpp"
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#ifdef __UCE_WASM_CORE__
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// markdown is pure compute (no PCRE/syscalls/regex) — it belongs in the wasm
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// core so markdown_to_html/markdown_to_ast render in-workspace. compiler.cpp
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// (which declares component() ahead of markdown in the native build) is carved
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// out here, and the wasm core defines component() later in src/wasm/core.cpp,
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// so markdown just needs the forward declaration.
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String component(String name, DValue props, Request& context);
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#include "markdown.cpp"
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#endif
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#ifndef __UCE_WASM_CORE__
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#include "compiler-parser.cpp"
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#include "compiler.cpp"
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@ -15,7 +15,11 @@
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#include <string>
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#include <vector>
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#if defined(__GNUG__)
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// The demangler is a host-side nicety for trap traces. wasi-libc++ does not
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// provide __cxa_demangle, and a wasm unit that merely includes uce_lib.h must
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// not pull it in as an unresolvable import — so it is host-only.
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#if defined(__GNUG__) && !defined(__wasm__)
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#define UCE_WASM_TRACE_HAVE_DEMANGLE 1
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#include <cxxabi.h>
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#endif
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@ -30,7 +34,7 @@ struct WasmTraceSummary
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inline std::string wasm_trace_demangle(const std::string& name)
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{
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#if defined(__GNUG__)
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#if defined(UCE_WASM_TRACE_HAVE_DEMANGLE)
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// frame names look like "module!symbol"; demangle the symbol part
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auto bang = name.find('!');
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std::string prefix = bang == std::string::npos ? "" : name.substr(0, bang + 1);
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@ -10,6 +10,10 @@
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// handle_complete() changes. CLI, serve_http, and websocket stay native.
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#include "../lib/wasm_trace.h"
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// The native server TU has the real connectors (sqlite/mysql) compiled in, so
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// the worker's host-side connector hostcalls are available here. The W3 CLI
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// driver does not define this and gets a named-trap stub for those imports.
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#define UCE_WASM_HOST_CONNECTORS 1
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#include "worker.cpp"
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#include <atomic>
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@ -44,6 +48,12 @@ static String wasm_backend_ensure_started(Request* context)
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path_join(cfg["COMPILER_SYS_PATH"], "bin/wasm/core.wasm"));
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wc.site_root = path_join(cfg["COMPILER_SYS_PATH"], cfg["SITE_DIRECTORY"]);
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wc.cache_root = cfg["BIN_DIRECTORY"];
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// write membrane allowlist: the site tree plus the runtime scratch dirs
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// pages legitimately write to (matches native reachable write targets).
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wc.write_roots = { wc.site_root, "/tmp" };
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for(const char* key : { "BIN_DIRECTORY", "SESSION_PATH", "TMP_UPLOAD_PATH" })
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if(cfg[key] != "")
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wc.write_roots.push_back(cfg[key]);
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wc.memory_limit = (int64_t)config_u64("WASM_MEMORY_LIMIT_BYTES", 512ull * 1024 * 1024);
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wc.epoch_deadline_ticks = config_u64("WASM_EPOCH_DEADLINE_TICKS", 200);
|
||||
wc.verbose = config_bool("WASM_BACKEND_VERBOSE", false);
|
||||
@ -75,31 +85,68 @@ static bool wasm_artifact_exists(Request* context, const String& entry_unit)
|
||||
if(entry_unit == "")
|
||||
return(false);
|
||||
String wasm_path = context->server->config["BIN_DIRECTORY"] + entry_unit + ".wasm";
|
||||
struct stat st;
|
||||
return(stat(wasm_path.c_str(), &st) == 0 && S_ISREG(st.st_mode));
|
||||
struct stat wasm_st;
|
||||
if(stat(wasm_path.c_str(), &wasm_st) != 0 || !S_ISREG(wasm_st.st_mode))
|
||||
return(false);
|
||||
// The wasm path bypasses the native JIT recompile, so a source edit would
|
||||
// otherwise be served from a stale .wasm. Require the artifact to be newer
|
||||
// than the source; if it is stale, fall back to native — which JIT-rebuilds
|
||||
// both .so and .wasm — so the next request gets a fresh artifact.
|
||||
struct stat src_st;
|
||||
if(stat(entry_unit.c_str(), &src_st) == 0 && wasm_st.st_mtime < src_st.st_mtime)
|
||||
return(false);
|
||||
return(true);
|
||||
}
|
||||
|
||||
// Decide, by source inspection, whether a page must stay on the native
|
||||
// backend for now (W5 surfaces not yet behind the membrane).
|
||||
//
|
||||
// Caveats this deliberately accepts:
|
||||
// - ENTRY-UNIT ONLY: a clean entry page that component()s into a native-only
|
||||
// unit is still served by wasm. With signals_based_traps off (see
|
||||
// make_engine) the worst case is a clean wasm error or a stubbed-empty
|
||||
// result, never a worker crash — so this is a best-effort routing hint,
|
||||
// not a guarantee. Full coverage is a W5 concern (un-stub the APIs).
|
||||
// - SUBSTRING match, intentionally conservative: a token like "xml_" also
|
||||
// matches an identifier or doc string containing it. That only ever
|
||||
// over-routes to native (always correct), never the reverse.
|
||||
static bool wasm_backend_native_fallback_uncached(Request* context, const String& entry_unit)
|
||||
{
|
||||
String source = file_get_contents(entry_unit);
|
||||
// Supported by the wasm core, intentionally NOT in this list:
|
||||
// - regex_* (host PCRE2 hostcall), xml_*/yaml_*/markdown_* (compiled in),
|
||||
// - unit_render()/component() (host resolver).
|
||||
// What remains is genuinely host-owned / native-only for now:
|
||||
// - zip, sqlite, background tasks, filesystem writes, sleeps;
|
||||
// - unit_call + compiler/unit introspection (need the native toolchain).
|
||||
StringList native_only_tokens = {
|
||||
"zip_", "task(", "task_repeat(",
|
||||
"task_pid(", "task_kill(", "unit_call(",
|
||||
"unit_compile(", "unit_info(", "units_list(", "compiler_load_shared_unit(",
|
||||
"usleep(", "sleep("
|
||||
};
|
||||
for(auto& token : native_only_tokens)
|
||||
if(source.find(token) != String::npos)
|
||||
return(true);
|
||||
return(false);
|
||||
}
|
||||
|
||||
static bool wasm_backend_native_fallback_needed(Request* context, const String& entry_unit)
|
||||
{
|
||||
if(!context || !context->server || entry_unit == "")
|
||||
return(true);
|
||||
String site_root = path_join(context->server->config["COMPILER_SYS_PATH"], context->server->config["SITE_DIRECTORY"]);
|
||||
// W5 keeps native as the reference backend for compiler/docs pages and the
|
||||
// host-owned service surfaces that are not membrane APIs yet. This makes the
|
||||
// default backend safe while W6 decides which fallbacks to retire vs keep.
|
||||
if(entry_unit.rfind(path_join(site_root, "doc") + "/", 0) == 0)
|
||||
return(true);
|
||||
String source = file_get_contents(entry_unit);
|
||||
StringList native_only_tokens = {
|
||||
"markdown_to_", "zip_", "sqlite_", "regex_", "xml_", "yaml_", "task(", "task_repeat(",
|
||||
"task_pid(", "task_kill(", "unit_call(", "unit_render(",
|
||||
"unit_compile(", "unit_info(", "units_list(", "compiler_load_shared_unit(",
|
||||
"file_put_contents(", "file_append(", "usleep(", "sleep("
|
||||
};
|
||||
for(auto& token : native_only_tokens)
|
||||
if(source.find(token) != String::npos)
|
||||
return(true);
|
||||
return(false);
|
||||
// Cache the verdict per process, keyed on path + mtime: the source scan is
|
||||
// otherwise a file read + 20 substring searches on every page request.
|
||||
struct CachedVerdict { time_t mtime; bool fallback; };
|
||||
static std::map<String, CachedVerdict> cache;
|
||||
struct stat st;
|
||||
time_t mtime = (stat(entry_unit.c_str(), &st) == 0) ? st.st_mtime : 0;
|
||||
auto it = cache.find(entry_unit);
|
||||
if(it != cache.end() && it->second.mtime == mtime)
|
||||
return(it->second.fallback);
|
||||
bool fallback = wasm_backend_native_fallback_uncached(context, entry_unit);
|
||||
cache[entry_unit] = { mtime, fallback };
|
||||
return(fallback);
|
||||
}
|
||||
|
||||
// True if this request should be served by the wasm backend. Falls through to
|
||||
@ -142,12 +189,17 @@ String wasm_backend_serve(Request& request, const String& entry_unit)
|
||||
if(!response.ok)
|
||||
return(response.error == "" ? String("wasm workspace failed") : response.error);
|
||||
|
||||
request.header["X-UCE-Backend"] = "wasm";
|
||||
request.header["X-UCE-Wasm-Workspace-Birth-Us"] = std::to_string(response.workspace_birth_us);
|
||||
request.header["X-UCE-Wasm-Component-Resolve-Count"] = std::to_string(response.component_resolve_count);
|
||||
request.header["X-UCE-Wasm-Component-Resolve-Total-Us"] = std::to_string(response.component_resolve_total_us);
|
||||
request.header["X-UCE-Wasm-Component-Resolve-Avg-Us"] = std::to_string(
|
||||
response.component_resolve_count ? response.component_resolve_total_us / response.component_resolve_count : 0);
|
||||
// Diagnostic timing headers are opt-in: they leak workspace internals and
|
||||
// belong to the W5 benchmark harness, not public responses.
|
||||
if(config_bool("WASM_BACKEND_VERBOSE", false))
|
||||
{
|
||||
request.header["X-UCE-Backend"] = "wasm";
|
||||
request.header["X-UCE-Wasm-Workspace-Birth-Us"] = std::to_string(response.workspace_birth_us);
|
||||
request.header["X-UCE-Wasm-Component-Resolve-Count"] = std::to_string(response.component_resolve_count);
|
||||
request.header["X-UCE-Wasm-Component-Resolve-Total-Us"] = std::to_string(response.component_resolve_total_us);
|
||||
request.header["X-UCE-Wasm-Component-Resolve-Avg-Us"] = std::to_string(
|
||||
response.component_resolve_count ? response.component_resolve_total_us / response.component_resolve_count : 0);
|
||||
}
|
||||
|
||||
// status line: keep the native default unless the unit set one
|
||||
String status = response.meta["status"].to_string();
|
||||
|
||||
@ -37,14 +37,81 @@ DValue MySQL::get_pending_result() { return(DValue()); }
|
||||
|
||||
String mysql_escape(String raw, char quote_char) { (void)quote_char; return(raw); }
|
||||
|
||||
bool SQLite::connect(String path) { this->path = path; connection = 0; set_error(1, WASM_DB_UNAVAILABLE); return(false); }
|
||||
void SQLite::disconnect() { connection = 0; }
|
||||
String SQLite::error() { return(error_code ? String(WASM_DB_UNAVAILABLE) : String("")); }
|
||||
DValue SQLite::query(String q) { (void)q; set_error(1, WASM_DB_UNAVAILABLE); return(DValue()); }
|
||||
DValue SQLite::query(String q, const StringMap& params) { (void)q; (void)params; set_error(1, WASM_DB_UNAVAILABLE); return(DValue()); }
|
||||
// sqlite runs host-side (the host links libsqlite and owns the connections in
|
||||
// a per-workspace handle table). One UCEB1-marshalled hostcall carries
|
||||
// {op,handle,path,query,params} in and {handle,result,insert_id,affected,
|
||||
// error_code,statement_info} out. `connection` holds the host handle (>0).
|
||||
extern "C" size_t uce_host_sqlite(const char* in, size_t in_len, char* out, size_t cap);
|
||||
|
||||
static DValue wasm_sqlite_call(DValue request)
|
||||
{
|
||||
String encoded = ucb_encode(request);
|
||||
size_t need = uce_host_sqlite(encoded.data(), encoded.size(), 0, 0);
|
||||
if(need == 0)
|
||||
return(DValue());
|
||||
String buffer(need, 0);
|
||||
size_t got = uce_host_sqlite(encoded.data(), encoded.size(), &buffer[0], need);
|
||||
if(got == 0 || got > need)
|
||||
return(DValue());
|
||||
DValue response;
|
||||
String error;
|
||||
ucb_decode(String(buffer.data(), got), response, &error);
|
||||
return(response);
|
||||
}
|
||||
|
||||
void SQLite::set_error(s32 code, String info) { error_code = code; statement_info = info; }
|
||||
bool SQLite::apply_default_pragmas() { return(false); }
|
||||
bool SQLite::bind_params(void* statement, const StringMap& params) { (void)statement; (void)params; return(false); }
|
||||
|
||||
bool SQLite::connect(String path)
|
||||
{
|
||||
this->path = path;
|
||||
DValue request;
|
||||
request["op"] = "connect";
|
||||
request["path"] = path;
|
||||
DValue response = wasm_sqlite_call(request);
|
||||
u64 handle = response["handle"].to_u64();
|
||||
connection = (void*)(uintptr_t)handle;
|
||||
error_code = (s32)response["error_code"].to_s64();
|
||||
statement_info = response["statement_info"].to_string();
|
||||
return(handle != 0 && error_code == 0);
|
||||
}
|
||||
|
||||
void SQLite::disconnect()
|
||||
{
|
||||
if(connection)
|
||||
{
|
||||
DValue request;
|
||||
request["op"] = "disconnect";
|
||||
request["handle"] = (f64)(uintptr_t)connection;
|
||||
wasm_sqlite_call(request);
|
||||
connection = 0;
|
||||
}
|
||||
}
|
||||
|
||||
String SQLite::error()
|
||||
{
|
||||
return(statement_info);
|
||||
}
|
||||
|
||||
DValue SQLite::query(String q, const StringMap& params)
|
||||
{
|
||||
DValue request;
|
||||
request["op"] = "query";
|
||||
request["handle"] = (f64)(uintptr_t)connection;
|
||||
request["query"] = q;
|
||||
for(auto& entry : params)
|
||||
request["params"][entry.first] = entry.second;
|
||||
DValue response = wasm_sqlite_call(request);
|
||||
insert_id = response["insert_id"].to_u64();
|
||||
affected_rows = (u32)response["affected"].to_u64();
|
||||
error_code = (s32)response["error_code"].to_s64();
|
||||
statement_info = response["statement_info"].to_string();
|
||||
DValue* result = response.key("result");
|
||||
return(result ? *result : DValue());
|
||||
}
|
||||
|
||||
DValue SQLite::query(String q) { return(query(q, StringMap())); }
|
||||
bool SQLite::apply_default_pragmas() { return(true); }
|
||||
bool SQLite::bind_params(void* statement, const StringMap& params) { (void)statement; (void)params; return(true); }
|
||||
DValue SQLite::collect_rows(void* statement) { (void)statement; return(DValue()); }
|
||||
|
||||
SQLite* sqlite_connect(String path)
|
||||
|
||||
@ -6,3 +6,7 @@ uce_host_random
|
||||
uce_host_component_resolve
|
||||
uce_host_file_exists
|
||||
uce_host_file_read
|
||||
uce_host_file_write
|
||||
uce_host_file_unlink
|
||||
uce_host_regex
|
||||
uce_host_sqlite
|
||||
|
||||
@ -35,6 +35,7 @@
|
||||
#include <optional>
|
||||
#include <string>
|
||||
#include <sys/stat.h>
|
||||
#include <unistd.h>
|
||||
#include <sys/time.h>
|
||||
#include <vector>
|
||||
|
||||
@ -69,6 +70,7 @@ struct WasmWorkerConfig
|
||||
String core_wasm_path = "bin/wasm/core.wasm";
|
||||
String site_root; // absolute
|
||||
String cache_root = "/tmp/uce/work";
|
||||
std::vector<String> write_roots; // absolute prefixes the write membrane allows
|
||||
int64_t memory_limit = 512ll * 1024 * 1024;
|
||||
u32 table_headroom = 4096;
|
||||
u64 epoch_deadline_ticks = 200; // ticker period × ticks = CPU budget
|
||||
@ -308,6 +310,15 @@ private:
|
||||
{
|
||||
wasmtime::Config config;
|
||||
config.epoch_interruption(true);
|
||||
// CRITICAL: the host (linux_fastcgi.cpp) installs its own SIGSEGV/SIGILL/
|
||||
// SIGBUS handlers per request (install_request_fault_handlers) with plain
|
||||
// signal(), which clobbers Wasmtime's trap-handling handlers. With
|
||||
// signals_based_traps on, a guest `unreachable`/OOB surfaces as a host
|
||||
// signal that the native on_segfault catches and abort()s the worker —
|
||||
// a 502 instead of a clean wasm trap. Disabling it makes Cranelift emit
|
||||
// explicit trap checks: guest traps stay pure wasm traps returned as
|
||||
// Result errors, never a host signal, so the two never collide.
|
||||
config.signals_based_traps(false);
|
||||
return(wasmtime::Engine(std::move(config)));
|
||||
}
|
||||
|
||||
@ -329,6 +340,18 @@ public:
|
||||
{
|
||||
}
|
||||
|
||||
#ifdef UCE_WASM_HOST_CONNECTORS
|
||||
// Host-owned resource handle table (§3.1): connections opened by the guest
|
||||
// live here and are closed when the workspace drops at request end.
|
||||
std::vector<SQLite*> sqlite_handles;
|
||||
~WasmWorkspace()
|
||||
{
|
||||
for(auto* db : sqlite_handles)
|
||||
if(db)
|
||||
delete db; // ~SQLite disconnects
|
||||
}
|
||||
#endif
|
||||
|
||||
// resolve-kind values shared with the guest core (src/wasm/core.cpp)
|
||||
// must match WasmResolveKind in src/wasm/core.cpp
|
||||
enum ResolveKind { RESOLVE_COMPONENT = 0, RESOLVE_RENDER = 1, RESOLVE_EXISTS = 2, RESOLVE_ONCE = 3 };
|
||||
@ -794,6 +817,13 @@ private:
|
||||
if(worker.cfg.verbose)
|
||||
fprintf(stderr, "[wasm] loaded %s (mem_base=%u table_base=%u)\n",
|
||||
source_path.c_str(), memory_base, table_base);
|
||||
// The epoch budget is a guest-CPU watchdog, but the ticker is wall-clock
|
||||
// and host-side module compilation here (lazy, mid-render, possibly many
|
||||
// units) burns it without the guest running. Reset the deadline after a
|
||||
// load so the budget measures guest execution between membrane crossings,
|
||||
// not our compile time. A genuine runaway loop makes no loads, so it
|
||||
// still trips the deadline.
|
||||
ctx().set_epoch_deadline(worker.cfg.epoch_deadline_ticks);
|
||||
return("");
|
||||
}
|
||||
|
||||
@ -864,17 +894,33 @@ private:
|
||||
candidates.push_back(entry_dir + "/" + raw);
|
||||
candidates.push_back(worker.cfg.site_root + "/" + raw);
|
||||
}
|
||||
char site_real[4096];
|
||||
if(!realpath(worker.cfg.site_root.c_str(), site_real))
|
||||
return("");
|
||||
String site_prefix = String(site_real) + "/";
|
||||
// readable roots = the site tree plus the writable scratch dirs (a page
|
||||
// can read back what it is allowed to write, e.g. /tmp), canonicalized.
|
||||
std::vector<String> read_roots;
|
||||
read_roots.push_back(worker.cfg.site_root);
|
||||
for(auto& root : worker.cfg.write_roots)
|
||||
read_roots.push_back(root);
|
||||
std::vector<String> root_prefixes;
|
||||
for(auto& root : read_roots)
|
||||
{
|
||||
char root_real[4096];
|
||||
if(root != "" && realpath(root.c_str(), root_real))
|
||||
root_prefixes.push_back(String(root_real) + "/");
|
||||
}
|
||||
for(auto& candidate : candidates)
|
||||
{
|
||||
char resolved[4096];
|
||||
if(!realpath(candidate.c_str(), resolved))
|
||||
continue;
|
||||
String path(resolved);
|
||||
if(path.rfind(site_prefix, 0) != 0)
|
||||
bool allowed = false;
|
||||
for(auto& prefix : root_prefixes)
|
||||
if(path.rfind(prefix, 0) == 0)
|
||||
{
|
||||
allowed = true;
|
||||
break;
|
||||
}
|
||||
if(!allowed)
|
||||
continue;
|
||||
if(file_exists_host(path))
|
||||
return(path);
|
||||
@ -882,6 +928,42 @@ private:
|
||||
return("");
|
||||
}
|
||||
|
||||
// write membrane policy: resolve the target (absolute, or relative to the
|
||||
// current unit / site root) and allow it only if its parent directory
|
||||
// canonicalizes under one of the configured write roots (site tree + the
|
||||
// runtime scratch dirs). The file itself need not exist yet.
|
||||
String resolve_guest_write(const String& raw, const String& current_unit)
|
||||
{
|
||||
if(raw == "" || raw.find('\0') != String::npos)
|
||||
return("");
|
||||
String target;
|
||||
if(raw.rfind("/", 0) == 0)
|
||||
target = raw;
|
||||
else
|
||||
{
|
||||
String current_dir = current_unit != "" ? dir_of(current_unit) : String("");
|
||||
target = (current_dir != "" ? current_dir : worker.cfg.site_root) + "/" + raw;
|
||||
}
|
||||
String parent = dir_of(target);
|
||||
String base = parent.size() < target.size() ? target.substr(parent.size() + 1) : String("");
|
||||
if(base == "" || base == "." || base == "..")
|
||||
return("");
|
||||
char parent_real[4096];
|
||||
if(!realpath(parent.c_str(), parent_real))
|
||||
return("");
|
||||
String resolved_parent(parent_real);
|
||||
for(auto& root : worker.cfg.write_roots)
|
||||
{
|
||||
char root_real[4096];
|
||||
if(root == "" || !realpath(root.c_str(), root_real))
|
||||
continue;
|
||||
String root_prefix(root_real);
|
||||
if(resolved_parent == root_prefix || resolved_parent.rfind(root_prefix + "/", 0) == 0)
|
||||
return(resolved_parent + "/" + base);
|
||||
}
|
||||
return("");
|
||||
}
|
||||
|
||||
static String sanitize_symbol_suffix(const String& raw)
|
||||
{
|
||||
// mirrors ascii_safe_name in functionlib.cpp
|
||||
@ -1062,6 +1144,133 @@ private:
|
||||
results[0] = Val((int32_t)bytes.size());
|
||||
return(std::monostate());
|
||||
}));
|
||||
if(mod == "env" && name == "uce_host_file_write")
|
||||
return(add([self](Caller, Span<const Val> args, Span<Val> results) -> Result<std::monostate, Trap> {
|
||||
String path, current, content;
|
||||
self->hostcall_read(args[0].i32(), args[1].i32(), path);
|
||||
self->hostcall_read(args[2].i32(), args[3].i32(), current);
|
||||
self->hostcall_read(args[4].i32(), args[5].i32(), content);
|
||||
bool append = args[6].i32() != 0;
|
||||
String resolved = self->resolve_guest_write(path, current);
|
||||
bool ok = false;
|
||||
if(resolved != "")
|
||||
ok = append ? file_append_contents(resolved, content) : file_put_contents(resolved, content);
|
||||
else if(self->worker.cfg.verbose)
|
||||
fprintf(stderr, "[wasm] file_write denied: %s\n", path.c_str());
|
||||
results[0] = Val(ok ? (int32_t)1 : (int32_t)0);
|
||||
return(std::monostate());
|
||||
}));
|
||||
#ifdef UCE_WASM_HOST_CONNECTORS
|
||||
if(mod == "env" && name == "uce_host_sqlite")
|
||||
return(add([self](Caller, Span<const Val> args, Span<Val> results) -> Result<std::monostate, Trap> {
|
||||
// {op,handle,path,query,params} in → result out. The real native
|
||||
// connector runs host-side; connections live in the workspace
|
||||
// handle table (handle = 1-based index).
|
||||
String encoded;
|
||||
self->hostcall_read(args[0].i32(), args[1].i32(), encoded);
|
||||
DValue request, response, decode_err_unused;
|
||||
String decode_error;
|
||||
if(ucb_decode(encoded, request, &decode_error))
|
||||
{
|
||||
String op = request["op"].to_string();
|
||||
if(op == "connect")
|
||||
{
|
||||
SQLite* db = new SQLite();
|
||||
db->connect(request["path"].to_string());
|
||||
u64 handle = 0;
|
||||
if(db->connection)
|
||||
{
|
||||
self->sqlite_handles.push_back(db);
|
||||
handle = self->sqlite_handles.size();
|
||||
}
|
||||
response["handle"] = (f64)handle;
|
||||
response["error_code"] = (f64)db->error_code;
|
||||
response["statement_info"] = db->error();
|
||||
if(handle == 0)
|
||||
delete db;
|
||||
}
|
||||
else
|
||||
{
|
||||
u64 handle = request["handle"].to_u64();
|
||||
SQLite* db = (handle >= 1 && handle <= self->sqlite_handles.size())
|
||||
? self->sqlite_handles[(size_t)handle - 1] : 0;
|
||||
if(op == "query" && db)
|
||||
{
|
||||
StringMap params;
|
||||
DValue* p = request.key("params");
|
||||
if(p)
|
||||
p->each([&](const DValue& value, String key) { params[key] = value.to_string(); });
|
||||
response["result"] = db->query(request["query"].to_string(), params);
|
||||
response["insert_id"] = (f64)db->insert_id;
|
||||
response["affected"] = (f64)db->affected_rows;
|
||||
response["error_code"] = (f64)db->error_code;
|
||||
response["statement_info"] = db->error();
|
||||
}
|
||||
else if(op == "disconnect" && db)
|
||||
{
|
||||
delete db;
|
||||
self->sqlite_handles[(size_t)handle - 1] = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
String out = ucb_encode(response);
|
||||
u32 cap = (u32)args[3].i32();
|
||||
int32_t buf = args[2].i32();
|
||||
if(buf != 0 && cap >= out.size())
|
||||
self->hostcall_write(buf, out);
|
||||
results[0] = Val((int32_t)out.size());
|
||||
return(std::monostate());
|
||||
}));
|
||||
#endif
|
||||
if(mod == "env" && name == "uce_host_file_unlink")
|
||||
return(add([self](Caller, Span<const Val> args, Span<Val>) -> Result<std::monostate, Trap> {
|
||||
String path, current;
|
||||
self->hostcall_read(args[0].i32(), args[1].i32(), path);
|
||||
self->hostcall_read(args[2].i32(), args[3].i32(), current);
|
||||
String resolved = self->resolve_guest_write(path, current);
|
||||
if(resolved != "")
|
||||
::unlink(resolved.c_str());
|
||||
return(std::monostate());
|
||||
}));
|
||||
if(mod == "env" && name == "uce_host_regex")
|
||||
return(add([self](Caller, Span<const Val> args, Span<Val> results) -> Result<std::monostate, Trap> {
|
||||
// {op,pattern,subject,flags,replacement} in (UCEB1) → result out.
|
||||
// PCRE2 lives host-side; this runs the real native regex_*.
|
||||
String encoded;
|
||||
self->hostcall_read(args[0].i32(), args[1].i32(), encoded);
|
||||
DValue request;
|
||||
String decode_error;
|
||||
DValue response;
|
||||
if(ucb_decode(encoded, request, &decode_error))
|
||||
{
|
||||
String op = request["op"].to_string();
|
||||
String pattern = request["pattern"].to_string();
|
||||
String subject = request["subject"].to_string();
|
||||
String flags = request["flags"].to_string();
|
||||
if(op == "match")
|
||||
response["bool"].set_bool(regex_match(pattern, subject, flags));
|
||||
else if(op == "search")
|
||||
response["tree"] = regex_search(pattern, subject, flags);
|
||||
else if(op == "search_all")
|
||||
response["tree"] = regex_search_all(pattern, subject, flags);
|
||||
else if(op == "replace")
|
||||
response["text"] = regex_replace(pattern, request["replacement"].to_string(), subject, flags);
|
||||
else if(op == "split")
|
||||
for(auto& part : regex_split(pattern, subject, flags))
|
||||
{
|
||||
DValue value;
|
||||
value = part;
|
||||
response["list"].push(value);
|
||||
}
|
||||
}
|
||||
String out = ucb_encode(response);
|
||||
u32 cap = (u32)args[3].i32();
|
||||
int32_t buf = args[2].i32();
|
||||
if(buf != 0 && cap >= out.size())
|
||||
self->hostcall_write(buf, out);
|
||||
results[0] = Val((int32_t)out.size());
|
||||
return(std::monostate());
|
||||
}));
|
||||
if(mod == "env" && name == "uce_host_component_resolve")
|
||||
return(add([self](Caller, Span<const Val> args, Span<Val> results) -> Result<std::monostate, Trap> {
|
||||
String target, current, resolved;
|
||||
|
||||
@ -9,6 +9,10 @@ def register(registry):
|
||||
return
|
||||
|
||||
pages = [
|
||||
# oob is __builtin_trap() → wasm `unreachable`, a signal-delivering trap.
|
||||
# It crashed the worker until signals_based_traps(false) (see make_engine
|
||||
# in src/wasm/worker.cpp); keeping it in the gate guards that fix.
|
||||
("wasm kill trap", "/tests/wasm-kill/oob.uce", "unreachable"),
|
||||
("wasm kill loop", "/tests/wasm-kill/loop.uce", "interrupt"),
|
||||
("wasm kill recurse", "/tests/wasm-kill/recurse.uce", "wasm_kill_recurse"),
|
||||
]
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user