subagent transcript

session 18e25685 · workflow wf_23df5b1c
← 18e25685 · archive
delegated task
Audit the project's own claims against evidence. Read /home/magik6k/lcad-wasm/freecad-port/STATUS.md and /home/magik6k/lcad-wasm/freecad-port/research
▸ Magik
Audit the project's own claims against evidence. Read /home/magik6k/lcad-wasm/freecad-port/STATUS.md and /home/magik6k/lcad-wasm/freecad-port/research/R10-eh-jspi-asyncify-findings.md. Then cross-check key claims against reality: - "GUI renders": check /home/magik6k/lcad-wasm/freecad-port/deploy-gui/boot-async.png exists and its recency. - "Python->OCCT works (makeBox vol=1000)": look for corroborating test output in /tmp/*.log or the harness /home/magik6k/lcad-wasm/freecad-port/../pytest.mjs. - "boolean cut() hangs": is this reproduced/understood or speculative? - Build artifacts: `ls -la /home/magik6k/lcad-wasm/freecad-port/deploy-gui/FreeCAD.js /home/magik6k/lcad-wasm/freecad-port/deploy-gui/FreeCAD.wasm` sizes/dates; is the deployed build the asyncify+JS-EH one (grep FreeCAD.js for Asyncify and 'getPyEMTrampolinePtr(){return 0')? Flag any overclaim, stale statement, or unverified assertion in STATUS.md/R10. Report findings.
Fable
thinking
I'll start by reading through the key files and running the necessary checks in parallel to get a complete picture.
Fable
I'll start by reading the two documents and gathering evidence in parallel.
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/STATUS.md"}
tool result
1	# FreeCAD wasm port — execution status
2	
3	Updated: 2026-07-04 (session 2)
4	
5	## Headline
6	**FreeCAD's full Qt GUI runs in a browser AND Python now drives the OCCT kernel
7	from the live module** — the two were previously mutually exclusive. The GUI
8	renders (menus, Start workbench "Welcome" with theme thumbnails, Report View,
9	modal dialogs) and `Part.makeBox(10,10,10).Volume → 1000` runs with no trampoline
10	crash. Screenshot: `deploy-gui/boot-async.png`. The 3D viewport still needs t  …[truncated]
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/research/R10-eh-jspi-asyncify-findings.md"}
tool result
1	# R10 — Exceptions / JSPI / Asyncify: the definitive matrix
2	
3	This documents an exhaustive investigation into the single hardest problem of the
4	port: making CPython's call trampoline, Qt's synchronous `exec()` event loop, and
5	OCCT's exception-heavy geometry kernel coexist in one wasm module. Every viable
6	combination of *exception model* × *stack-switching model* was built and tested.
7	
8	## The three sub-problems (each forces a choice)
9	
10	1. **CPython call trampoline.** CPython ≥3  …[truncated]
Fable
⚙ Bash {"command": "ls -la /home/magik6k/lcad-wasm/freecad-port/deploy-gui/FreeCAD.js /home/magik6k/lcad-wasm/freecad-port/deploy-gui/FreeCAD.wasm /home/magik6k/lcad-wasm/freecad-port/deploy-gui/boot-async.png 2>&1; echo \"---NOW---\"; date; echo …
tool result
Exit code 2
-rw-r--r-- 1 agent agent    523223 Jul  4 06:38 /home/magik6k/lcad-wasm/freecad-port/deploy-gui/FreeCAD.js
-rwxr-xr-x 1 agent agent 188416217 Jul  4 06:38 /home/magik6k/lcad-wasm/freecad-port/deploy-gui/FreeCAD.wasm
-rw-r--r-- 1 agent agent    121601 Jul  4 06:45 /home/magik6k/lcad-wasm/freecad-port/deploy-gui/boot-async.png
---NOW---
Sat Jul  4 12:30:33 CEST 2026
---LOGS---
-rw-r--r-- 1 agent agent     1886 Jul  3 20:10 /tmp/alllink.log
-rw-r--r-- 1 agent agent     1886 Jul  3 20:10  …[truncated]
Fable
thinking
Looking at the file timestamps and sizes, the boot-async.png screenshot from about 6 hours ago is recent enough to be useful, and the FreeCAD WebAssembly build is substantial at 188MB. The cuttest.log file being completely empty is telling—it suggests the boolean cut operation hung without producing any output, which is directly relevant to the issue I'm investigating.

Now I need to examine the pytest.mjs file itself, check the FreeCAD.js implementation for Asyncify support and the trampoline patch, review the build logs (especially fc-build-async.log), and search for evidence of the makeBox result to confirm what's happening.
Fable
Now let me check the pytest harness, the FreeCAD.js build markers, and the cut test log.
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/pytest.mjs"}
tool result
1	import { chromium } from 'playwright';
2	import http from 'http'; import fs from 'fs'; import path from 'path';
3	const DIR='/home/magik6k/lcad-wasm/freecad-port/deploy-gui';
4	const mime={'.js':'text/javascript','.wasm':'application/wasm','.html':'text/html','.data':'application/octet-stream'};
5	const srv=http.createServer((q,r)=>{let f=path.join(DIR,q.url==='/'?'index-pytest.html':decodeURIComponent(q.url.split('?')[0]));fs.readFile(f,(e,d)=>{if(e){r.writeHead(404);r.end();return;}r.writeHe  …[truncated]
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/deploy-gui\necho \"=== Asyncify markers in FreeCAD.js ===\"; grep -c -i \"asyncify\" FreeCAD.js\necho \"=== getPyEMTrampolinePtr ===\"; grep -o \"getPyEMTrampolinePtr[^;]*\" FreeCAD.js | …
tool result
=== Asyncify markers in FreeCAD.js ===
1
=== getPyEMTrampolinePtr ===
getPyEMTrampolinePtr(){return 0
getPyEMTrampolinePtr()
=== return 0 trampoline ===
1
=== JSPI/promising markers ===
1
=== cuttest.log size/content ===
-rw-r--r-- 1 agent agent 0 Jul  4 06:15 /tmp/cuttest.log
0 /tmp/cuttest.log
=== makeBox volume 1000 / 999.99 anywhere in logs ===
/tmp/conf-final2.log
/tmp/fc-build.log
/tmp/fc-build-we.log
/tmp/fc-build-jseh.log
/tmp/gui-build6.log
/tmp/gui-build2.log
/tmp/gui-conf-async5.log
/  …[truncated]
Fable
thinking
I've confirmed the deployed FreeCAD.js build includes Asyncify and the JavaScript exception handling setup with the forced JS trampoline function. The cuttest.log file being completely empty is the key clue here—the boolean cut test ran but produced zero output, which suggests something's preventing the expected results from being generated or logged.

Now I need to track down where the specific makeBox volume claim of "999.9999999999998" actually came from, since the grep results are just pulling from build logs rather than actual test output. Let me examine the pytest harness configuration and search for that exact floating-point string to see if it's documented anywhere, plus verify wheth  …
Fable
Let me dig into the makeBox evidence and the cut test specifics.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/deploy-gui\necho \"=== search for specific volume string 999.9999999999998 anywhere ===\"; grep -rn \"999.9999999999998\\|999.99999\" /tmp/*.log /home/magik6k/lcad-wasm/freecad-port/ 2>/d…
tool result
=== search for specific volume string 999.9999999999998 anywhere ===
/home/magik6k/lcad-wasm/freecad-port/FreeCAD/data/examples/Schenkel.stp:981:#4168=CARTESIAN_POINT('Control Point',(140.,9.99999999996,4.32661856421)) ;
/home/magik6k/lcad-wasm/freecad-port/FreeCAD/data/examples/Schenkel.stp:982:#4169=CARTESIAN_POINT('Control Point',(140.,9.99999999996,4.)) ;
/home/magik6k/lcad-wasm/freecad-port/FreeCAD/data/tests/ModelRefineTests/Y_Rod_Mount.brep:252:1 -1.9008845862849215 1.1867148732700414 -  …[truncated]
Fable
thinking
The volume string I found in the logs isn't actually from the test output—those grep matches were just STEP file coordinates and build compilation logs, not the actual test results. I need to examine the pytest HTML report directly to see what the test is actually capturing and whether it's showing the expected makeBox value of 1000.
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/deploy-gui/index-pytest.html"}
tool result
1	<!DOCTYPE html><html><head><meta charset="utf-8"><title>FC pytest</title></head>
2	<body><div id="screen" style="position:absolute;inset:0"></div>
3	<script>
4	window.__log=[]; window.__done=false;
5	var Module={
6	  qtContainerElements:[document.getElementById('screen')],
7	  arguments:['/startup.py'],
8	  preRun:[(M)=>{
9	    const E=M.ENV;
10	    E.FREECAD_HOME='/freecad/'; E.PYTHONPATH='/python/python3.14.zip:/python';
11	    E.HOME='/tmp'; E.QT_LOGGING_RULES='*=false';
12	    M.FS.writeFi  …[truncated]
Fable
⚙ Bash {"command": "echo \"=== any file containing 999.9999999999998 (the R10 claimed value) ===\"; grep -rn \"999.9999999999998\" /home/magik6k/lcad-wasm 2>/dev/null | grep -v Binary | head\necho; echo \"=== any captured pytest RESULT/makeBox run…
tool result
=== any file containing 999.9999999999998 (the R10 claimed value) ===
/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Mod/Fem/femexamples/meshes/mesh_canticcx_hexa20.py:61:    femmesh.addNode(1999.9999999999998, 0.0, 1000.0000000000005, 59)
/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Mod/Fem/femexamples/meshes/mesh_canticcx_hexa20.py:63:    femmesh.addNode(999.9999999999998, 0.0, 1000.0000000000002, 61)
/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/Mod/Fem/femexamples/meshes/mesh_cantic  …[truncated]
Fable
thinking
I'm realizing something critical: the startup.py script only sets `window.__done` to true after the cut operation completes successfully, but the R10/STATUS logs indicate the cut is hanging. This means the pytest harness would never actually reach that point where it signals completion — it gets stuck waiting for the cut to finish.

Looking at what the harness actually logs, it prints "MADE_SHAPES" after makeBox and makeCylinder succeed, which does prove those operations work. But then it tries to cut, and if that hangs, the test never produces the "PY_EVENTLOOP_DONE" message needed to set done=true. So the pytest run would show done=false with partial logs.

There's another issue: the R10 c  …
Fable
The harness reveals something important. Let me view the screenshot and check for actual captured run output plus the emsdk version discrepancy.
Fable
⚙ Read {"file_path": "/home/magik6k/lcad-wasm/freecad-port/deploy-gui/boot-async.png"}
tool result
[image]
Fable
⚙ Bash {"command": "echo \"=== Any captured run showing PY_START / MADE_SHAPES / vol= (proof cut ran & hung, or makeBox ran) ===\"; grep -rn \"PY_START\\|MADE_SHAPES\\|PY_EVENTLOOP_DONE\\|vol=\" /tmp/*.log /home/magik6k/lcad-wasm 2>/dev/null | gre…
tool result
=== Any captured run showing PY_START / MADE_SHAPES / vol= (proof cut ran & hung, or makeBox ran) ===
/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/3rdParty/salomesmesh/src/SMDS/SMDS_Mesh.cpp:2577:        SMDS_VolumeIteratorPtr itvol=volumesIterator();
/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/3rdParty/salomesmesh/src/SMESH/SMESH_MeshEditor.cpp:11523:                                  for (int ivol=0; ivol<nbvol; ivol++)

=== emsdk version used for the deployed async build (fc-cfg-async  …[truncated]
Fable
thinking
The boot-async.png screenshot confirms the GUI rendered successfully, showing the FreeCAD interface with menus, the Welcome Start workbench with theme options, and the Report View—all matching what I'd expect to see.

The deployed build is definitely the asyncify+JS-EH+forced-JS-trampoline version built on emsdk 4.0.12, which I can verify from the FreeCAD.js file containing "Asyncify" and "AsyncifyImport" along with the trampoline pointer function, and the configure flags showing `-fexceptions` for JS exception handling.

However, the Python-to-OCCT claim about makeBox producing a volume of 999.9999999999998 isn't backed up by any actual test output—cuttest.log is empty, and that specific va  …
Fable
I have enough evidence to complete the audit. Let me compile findings. The screenshot confirms the GUI-renders claim (menus, "Welcome to FreeCAD" Start workbench with Light/Dark theme thumbnails, Report View). The build markers confirm the deployed binary is the asyncify+JS-EH+forced-JS-trampoline one. But the "Python→OCCT / makeBox vol=1000" claim has no captured evidence, and the cut-hang story is internally contradictory.
Fable
⚙ StructuredOutput {"findings": [{"severity": "high", "category": "unverified-claim", "summary": "'Python->OCCT works (makeBox vol=1000 / 999.9999999999998)' has NO captured test evidence, and the only present harness cannot even produce a makeBox volume.", "…
tool result
Structured output provided successfully