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Releases: hexplus/pxjs

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PXJS 0.1.0

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@hexplus hexplus released this 06 Oct 14:27
v0.1.0
ce14a30

Downloads

File What
pxjs-0.1.0-psp-lib.zip libpxjs.a and pxjs.h, to embed PXJS in PSP homebrew. Link with -lpxjs -lpsprtc -lm.
pxjs-0.1.0-psp-runner.zip An EBOOT that runs main.js from its own folder and shows what it prints. Copy the PSP folder to the Memory Stick (custom firmware, or PPSSPP), replace main.js with your script.
pxjs-0.1.0-linux-i386.tar.gz The pxjs command-line runner, a static 32-bit Linux binary: ./pxjs file.js.

The packages were built from b8eba50, which adds the packaging (psp/, tools/release.sh) to this tag; the engine source is the same.

The first release.

The engine

  • Strict-mode ECMAScript 2023, written from scratch in C (about 28k lines), with no dependencies beyond libc and libm.
  • Test262: 34,054 of 34,460 applicable ES2023 tests pass (98.8%), on the pinned commit 7ab7fafa. The exclusions made by design are listed in docs/compatibility.md.
  • Values: one 32-bit word each; 31-bit integers without allocation.
  • Memory: one fixed heap arena and a non-moving mark-sweep collector without C recursion. Out of memory is a catchable error: every allocation site reached by the test suite was failed in turn, under ASan, and recovered.
  • Compiler and VM: a single-pass compiler to bytecode; JavaScript calls do not recurse in C; inline caches, including for primitive receivers; fused compare-and-branch instructions.
  • Numbers: exact conversions in both directions (shortest round-trip digits, correctly rounded parsing) without printf, checked against exact references.
  • RegExp with lookbehind, named groups and Unicode property escapes (tables generated from Unicode 17.0); backtracking is bounded, so a catastrophic pattern throws instead of hanging.
  • Web extras: structuredClone, atob/btoa, TextEncoder/TextDecoder, and URL/URLSearchParams (all 1,174 cases of the Web Platform Tests' URL data).

The embedding API

include/pxjs.h: values and objects, native functions with bound data, handles and roots, typed-array bytes, finalizers, modules with a host resolver, jobs and promises for native async work, a rejection tracker, an interrupt hook (which may throw its own error), an out-of-memory handler, and memory statistics.

Platforms

  • Sony PSP (MIPS Allegrex), built with PSPDEV: tested in PPSSPP and on a PSP-1000 (firmware 6.61) as the engine of PSPX.
  • 32-bit x86 hosts (-m32), for development and testing, with ASan, UBSan and a GC-stress mode.

Not supported

By design: sloppy mode, eval and new Function, BigInt, Intl, SharedArrayBuffer and Atomics. The known deviations from the specification are listed in docs/engine-audit.md.

Assets 5
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