# Session save — 2026-09-22/23 (m2compiler-V3, step 8.1)

## Where we are

HEAD: `6877b81`. Milestone tags `v3-step8.1` (plus all of
`v3-step5.1`…`v3-step7.1`). Suite **103/103**, build warning-free.
Tree clean; `git.txt` untracked (ignored). No remote.

## Step 8.1 (this landing)

- **Redux sweep of the compiler's own sources**: `M2.atg`,
  `SymTab.mod`, `QbeGen.mod`, `compiler.frm`, `parser.frm`,
  `scanner.frm` converted (`&`→`AND`, `~`→`NOT`, `<>`→`#`, octal
  `NNC`→`CHR(n)`), string/comment-aware. Still builds under gm2;
  103/103. (`FileIO` left as the host library — stage-1 split.)
- **V3 lenient SYSTEM imports**: `FROM SYSTEM IMPORT TSIZE;` parses
  (pervasive names accepted and ignored; built-in applies).

## Measured gap: V3 compiling `SymTab`

Running V3 over `SymTab.def` + `SymTab.mod` reveals the next work
(recorded in `docs/summary_step8.1.md`):

1. **Named-CONST folding** — `ARRAY [0 .. MaxPend - 1]` and similar
   bounds are 230: V3 folds only literals; a named `CONST` loads as
   a temporary. Dominant cause of the failures. Needs compile-time
   constant-expression folding (named CONSTs + `+`/`-`).
2. **Type-operand `TSIZE`/`SIZE`** — `TSIZE(ScopeNode)` (a type
   name) is unsupported; V3's built-in takes a designator.
3. Cascading `ident expected`/201s that should clear once the two
   above are fixed.

## Remaining for step 8

1. Named-CONST folding (biggest unblocker) + type-operand
   `TSIZE`/`SIZE`.
2. Cross-stage `FileIO` selection in the build (stage 1 host library,
   stage 2 `runtime/syslib/FileIO`).
3. `bootstrap/fixpoint.sh`: Stage1 (gm2) → Stage2 (V3) → Stage3 (V3),
   `diff -r` all `.ssa` byte-identical, suite green on all stages
   (rolling-bootstrap design per the Blaise map).

Deferred elsewhere: class lowering (vtable/`THIS`), procedure-type
variables, cross-class `VAL`/`CAST`, `FLOAT`/`TRUNC`, `CAP`, long↔REAL
conversions, string escapes, `WITH`-field `VAR` actuals.

## Resume commands

```sh
cd /home/eric/Projets/Projets-Modula2/MyWork/m2compiler-V3/compiler
./build.sh && ./run_tests.sh   # expect 103/103, zero gm2 warnings
```
Recommended next: named-CONST constant folding in V3.