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Self-host M3: PHPTypes/CFG static init in emit-TU LLVM global ctor (link segfault) #2540
Description
Milestone
M3 — HelloWorld / compile-smoke native emit execute (downstream of parse spine; parent #1492)
Problem
May 2026 update: emit-helper link is green on master for runtime, compile-smoke, and HelloWorld TUs. The first failure is now parseAndCompile returned null at execute (#2566, #2568, #2559–#2567).
This issue tracks the next failure class once parse spine returns a non-null Block: LLVM 9 global ctor / type reconstructor crash during emit-helper execute (historically also seen at link time).
Probe prints NEXT_LOWER: M3 emit TU runtime init (global ctor / type reconstructor; #1937) on partial runs.
Scope
| Area | Path | Notes |
|---|---|---|
| Emit TU compile | lib/JIT.php — compileM3EmitTuMainNative() |
Global init / ctor emission for bundled vendor types |
| Runtime init | lib/JIT/RuntimeInitVmContext.php |
May share ctor ordering with emit TU |
| PHPTypes | vendor/ircmaxell/php-types/lib/PHPTypes/TypeReconstructor.php |
Dynamic property warnings during compile |
| php-cfg | vendor/ircmaxell/php-cfg/... |
Switch_::$cond dynamic property during spine compile |
| Deny list | lib/JIT.php — m3CompileDriverSpineDenyNames() |
Ensure ctor helpers not stubbed when real lowering on |
Repro (after #2566 green — may segfault at execute)
./script/docker-exec.sh -- bash -lc '
source script/php-env.sh
BOOTSTRAP_M3_LINK_COMPILE_DRIVER=1 \
BOOTSTRAP_M3_COMPILE_DRIVER_REAL_LOWERING=1 \
BOOTSTRAP_M3_RUNTIME_COMPILE=1 \
./script/bootstrap-m3-emit-tu-execute.sh
'Prerequisite bisect (fails today at parseAndCompile):
BOOTSTRAP_M3_RUNTIME_COMPILE=1 \
BOOTSTRAP_M3_LINK_COMPILE_DRIVER=1 \
make bootstrap-selfhost-runtime-compile-smokeDone when
- Self-host M3: runtime_m3_emit execute — parseAndCompile returned null (smallest emit TU) #2559 / Self-host M3: Runtime::parseAndCompile native spine returns null in emit-TU bridge #2566 green (parseAndCompile non-null)
- Emit-helper execute completes without segfault for all three emit TUs
-
./script/bootstrap-selfhost-helloworld-probe.sh(M3 native emit env) reportsemit_path=native
Labels
suggested: self-host, bootstrap, IMPORTANT
Epic #1492 · Prerequisite #2566 · #2568 · Execute gate #2552
Activity
PurHur commentedon May 26, 2026
Link-time emit-helper Runtime alloc fixed in #2547 (allocateEmitTuShell). Remaining: initVmContext runtime segfault + initParsePipeline PHP CFG link segfault before emit_path=native.
Merge pull request #2547 from PurHur/agent/issue-2540-emit-tu-parse-s…
Self-host M3: LLVM stubs for emit-TU link without PHP CFG (#2540)
Merge origin/master: integrate parseAndCompile bridge with #2540 emit TU
Self-host M3: real-lower Runtime parse spine in emit TU when M3 drive…
PurHur commentedon May 26, 2026
Reopened (backlog-architect May 2026): harness still hits LLVM emit-TU global ctor segfault on M3 strict HelloWorld execute — emit helper link OK, run segfaults. See repro on #1492.
PurHur commentedon May 26, 2026
Priority: P0 after #2559 + #2561 green (HelloWorld execute segfault; link already OK on master). Epic #1492.
Fix HelloWorld probe NEXT_LOWER triage when emit helper not linked (#…
PurHur commentedon May 27, 2026
Backlog architect update (2026-05-27 harness):
M3 strict emit ladder is green on
master:BOOTSTRAP_M3_COMPILE_SMOKE_STRICT=1 ./script/bootstrap-selfhost-compile-smoke-probe.sh→emit_path=nativeBOOTSTRAP_M3_RUNTIME_COMPILE_SMOKE_STRICT=1 ./script/bootstrap-selfhost-runtime-compile-smoke.sh→emit_path=nativemake bootstrap-selfhost-helloworld(Makefile strict defaults) →emit_path=native#2568 ✅ closed.
This issue (global ctor / PHPTypes segfault) is deferred until #2633 (
bin/compile.phpnative emit /parseAndCompilenull) is green — that is the current M5 first compile-path failure. Reprioritize execute-time ctor work after parse spine succeeds on the production driver.Self-host: unify M3 emit TU sidecars and vendor static JIT (#2666) (#…
PurHur commentedon May 27, 2026
Harness verification (2026-05-27) — candidate close
Emit-helper execute is green on
master:Prerequisites #2559 / #2566 appear satisfied on current
master. If no remaining segfault repro, close this issue and track any new ctor/init failures under fresh tickets with a failingbuild/.last-jit-func-*path.#1492 backlog run: recommend close unless a maintainer has a red repro on latest
master.PurHur commentedon May 27, 2026
Closing: emit-TU execute + M3 strict native emit green on harness 2026-05-27 (see last comment). Reopen with fresh repro if global ctor segfault returns.
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