Changelog

All notable changes to WAFER are documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

0.2.0 - 2026-08-06

The usability release: introspection, source files, honest errors, and a safety net under every compiled word.

Added

Stack guards in compiled code: under/overflow checks at the stack-pointer choke points of generated WASM. Faults THROW standard codes (-3..-6, -44, -45), are CATCHable, and print standard messages instead of silently corrupting memory. Default on; wafer build output stays unguarded; WAFER_STACK_GUARDS=0|1 overrides.
SEE: source-level decompiler. Colon words (including everything in boot.fth) show their captured verbatim source; data words show synthesized definitions with current values (9 VALUE X, DEFER D ( IS DUP )); primitives fall back to a readable IR dump — SEE never dead-ends on a defined word.
SEE-IR: post-optimization IR view with resolved callee names and indented control flow — shows what the optimizer actually did.
HELP: stack effect + one-line description for every word in a fresh VM (dictionary words and outer-interpreter tokens alike); coverage is enforced by a unit test, so an undocumented new word fails the build. User words echo their leading ( n -- n ) comment.
INCLUDE / INCLUDED: nestable source-file loading with cycle detection, depth bound, paths relative to the including file, and per-level SOURCE-ID. The loader is injected (CLI: filesystem; web: defined error), so the core stays IO-free. wafer prog.fth now runs through the same machinery.
MARKER extensions: REMEMBER (re-runnable marker), EMPTY and GILD (boot-state rollback and re-baselining). Marker rollback now also restores search order, wordlists, REPLACES substitutions, ABORT" texts, and captured word sources — enabling the REMEMBER + INCLUDE edit-reload loop.
WORDS: optional substring filter (WORDS FLOAT), word count, and WORDS ALL — a grouped full view by wordlist plus internal words.
Return-stack introspection: .RS, RDEPTH, RP@.
Tools: .S honors BASE, F.S, ?, bounds-checked DUMP, real BYE, named ORDER output.
CLI REPL: persistent history (XDG state dir, 0600), dictionary-backed tab completion, prefix history search on Up/Down, Ctrl-C clears the line.
Web REPL: history persisted to localStorage, User Words palette, BASE indicator in the stack bar.
Error reporting: uncaught THROW codes map to standard messages; ABORT" text prints only when uncaught; errors inside included files carry file.fth:line: context; uncaught throws are typed (WaferError::UncaughtThrow) for embedding consumers; compiled words carry WASM name sections, so genuine traps name the faulting word (in CRASHER: wasm trap: out of bounds memory access).
SwiftForth correctness lane: the cross-engine program corpus can run against sf64 as an oracle (just compare-correctness), alongside the existing gforth lane and the sf64 performance lane.

Fixed

Multi-line command output in the CLI REPL starts on its own line (inline ok echo only for single-line output).
.S printed in decimal regardless of BASE.
A bare interpreted R> underflowed silently (exposed by the new stack guards; compliance baseline updated).
SPACES with a negative count now outputs nothing, per Forth 2012 6.1.2230.

Changed

wafer prog.fth reports errors with file:line context and resolves nested INCLUDEs relative to the file.
Internal words (_-prefixed) are flagged in the dictionary and hidden from WORDS and completion (WORDS ALL shows them).
Dependencies upgraded across the board: wasmtime 43 → 47, wasm-encoder/wasmparser 0.246 → 0.255, plus all semver-compatible updates.

0.1.0 - 2026-08-04

Initial development line (untagged): Forth 2012 core with IR optimizer and WASM codegen via wasm-encoder/wasmtime, ~300 words across Core, Double, Float, String, Search-Order, Exception, and Tools word sets, Forth 2012 compliance suite, CONSOLIDATE whole-program recompilation, wafer build AOT export (WASM / native / JS loader), browser REPL, SHA-1/256/512 words, and cross-engine benchmark lanes against gforth and SwiftForth.

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