giles 4d1079aa5e Fix JIT server hang: compiled compiler helpers loop on complex ASTs ...

Root cause: pre-compiled compiler helper functions (compile-expr,
compile-cond, etc.) produce bytecode that loops when processing
deeply nested ASTs like tw-resolve-style. The test suite passes
because _jit_compiling prevents compiled function execution during
compilation — all functions run via CEK. The server pre-compiled
helpers, so they ran as bytecode during compilation, triggering loops.

Fix:
- _jit_compiling guard on the "already compiled" hook branch prevents
  compiled functions from running during JIT compilation. Compilation
  always uses CEK (correct for all AST sizes). Normal execution uses
  bytecode (fast).
- "compile" itself marked as jit_failed_sentinel — never JIT compiled.
  Runs via CEK, while its helpers use bytecode for normal (non-compile)
  execution.
- Server hook uses call_closure (own VM per call) for IO suspension
  safety. MCP uses call_closure_reuse (fast, no IO needed).

The underlying bytecode bug in the compiled helpers remains — fixing
it requires diagnosing which specific helper loops and why. This is
tracked as a separate issue. Server now starts in ~30s (pre-warm)
and serves pages correctly.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-07 22:17:51 +00:00

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