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VM import suspension for browser lazy loading

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Bytecode compiler now emits OP_PERFORM for (import ...) and compiles
(define-library ...) bodies. The VM stores the import request in
globals["__io_request"] and stops the run loop — no exceptions needed.
vm-execute-module returns a suspension dict, vm-resume-module continues.

Browser: sx_browser.ml detects suspension dicts from execute_module and
returns JS {suspended, op, request, resume} objects. The sx-platform.js
while loop handles cascading suspensions via handleImportSuspension.

13 modules load via .sxbc bytecode in 226ms (manifest-driven), both
islands hydrate, all handlers wired. 2650/2650 tests pass including
6 new vm-import-suspension tests.

Also: consolidated sx-platform-2.js → sx-platform.js, fixed
vm-execute-module missing code-from-value call, fixed bootstrap.py
protocol registry transpiler issues.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
giles
2026-04-04 17:11:12 +00:00
parent efd0d9168f
commit 2727577702
43 changed files with 4672 additions and 3991 deletions
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27
hosts/ocaml/browser/compile-modules.js
View File

@@ -70,37 +70,26 @@ for (const file of FILES) {
}
// ---------------------------------------------------------------------------
// Strip define-library/import wrappers for bytecode compilation.
// Strip define-library wrapper for bytecode compilation.
//
// The VM's execute_module doesn't handle define-library or import — they're
// CEK special forms. So the compiled bytecode should contain just the body
// defines. The eval-blob phase (above) already handled library registration
// via CEK. The JS loader pre-resolves deps, so no registry needed at runtime.
// Keeps (import ...) forms — the compiler emits OP_PERFORM for these, enabling
// lazy loading: when the VM hits an import for an unloaded library, it suspends
// to the JS platform which fetches the library on demand.
//
// Strips define-library header (name, export) and (begin ...) wrapper, leaving
// the body defines + import instructions as top-level forms.
// ---------------------------------------------------------------------------
function stripLibraryWrapper(source) {
// Line-based stripping: remove (import ...), unwrap (define-library ... (begin BODY)).
// Works with both pre-existing and newly-wrapped formats.
// Line-based stripping: unwrap (define-library ... (begin BODY)), keep (import ...).
const lines = source.split('\n');
const result = [];
let skip = false; // inside header region (define-library, export)
let importDepth = 0; // tracking multi-line import paren depth
for (let i = 0; i < lines.length; i++) {
const line = lines[i];
const trimmed = line.trim();
// Skip (import ...) — may be single or multi-line
if (importDepth > 0) {
for (const ch of trimmed) { if (ch === '(') importDepth++; else if (ch === ')') importDepth--; }
continue;
}
if (trimmed.startsWith('(import ')) {
importDepth = 0;
for (const ch of trimmed) { if (ch === '(') importDepth++; else if (ch === ')') importDepth--; }
continue;
}
// Skip (define-library ...) header lines until (begin
if (trimmed.startsWith('(define-library ')) { skip = true; continue; }
if (skip && trimmed.startsWith('(export')) { continue; }