subagent transcript

session 17f09f89 · workflow wf_4e894f41

delegated task

You are working on the FreeCAD -> WebAssembly port. Ground EVERYTHING in the real code; do not guess. - Source tree: /home/magik6k/lcad-wasm/freecad-p

▸ Magik

You are working on the FreeCAD -> WebAssembly port. Ground EVERYTHING in the real code; do not guess. - Source tree: /home/magik6k/lcad-wasm/freecad-port/FreeCAD (git branch wasm-port). CMake build dir (out-of-source, already configured): /opt/toolchains/src/freecad-gui-build — read /opt/toolchains/src/freecad-gui-build/CMakeCache.txt for BUILD_* flags and dep paths. Build binary: bin/FreeCAD.wasm (~180 MB). - Toolchain: emscripten, ASYNCIFY + JS exceptions (-fexceptions), SINGLE-THREADED (no pthreads). Static CPython 3.14 + static Qt 6.11 (wasm) + static OCCT + static Coin3D. Everything is statically linked; there is NO dlopen — Python C-extension modules are registered statically via PyImport_AppendInittab in the generated file src/Main/WasmInittab.cpp / WasmInittabGui.cpp (see also freecadWasmRegisterInittab in src/Main/MainGui.cpp). - CRITICAL wasm constraints you MUST check for and design around: (1) THREADING HANGS: any std::thread ctor / std::async(default or async policy) / QThreadPool / QtConcurrent / QThread worker HANGS or throws (no pthreads). Fix pattern: force synchronous/deferred on __EMSCRIPTEN__ (e.g. std::launch::deferred), or #ifndef FC_OS_WASM guard the worker and run inline. Example already in-tree: Mod/Sketcher/App/planegcs/GCS.cpp forced std::launch::deferred; App/Application.cpp guards _recomputeThread with #ifndef FC_OS_WASM; Gui/ProgressBar.cpp skips qApp->processEvents() on __EMSCRIPTEN__. (2) MODAL DIALOGS / NESTED EVENT LOOPS: QDialog::exec()/QMessageBox::exec()/QEventLoop::exec() may deadlock under asyncify when driven from outside the main loop. Task-panel (docked, non-modal) dialogs are preferred. (3) Reentrant ccalls from JS during asyncify suspend corrupt state — a QTimer command-pump (/fc-cmd.py) exists for JS->Python. QtWebEngine has NO wasm port (Web workbench / in-app help / real Start page can't use it). (4) Wasm guards used in-tree: __EMSCRIPTEN__ (compiler-provided) and FC_OS_WASM (FreeCAD-defined) — both are defined on wasm. - Built modules today: Part, Sketcher, Material, Start (+ kernel). Everything else is OFF (see BUILD_* in CMakeCache). - PySide/shiboken: FREECAD_USE_PYSIDE=OFF, FREECAD_USE_SHIBOKEN=OFF, PySide6_DIR/Shiboken6_DIR NOTFOUND. Python 'PySide'/'shiboken6' import fails at runtime ("Cannot load shiboken6"). Many workbenches (Draft, BIM, most task dialogs) are Python+PySide and cannot function without it. DELIVERABLES — do BOTH: 1) Write a thorough, concrete, ready-to-apply plan to /home/magik6k/lcad-wasm/porting/<SLUG>/plan.md — include: exact CMake flags/edits, exact source edits (file + before/after or unified-diff snippets precise enough to apply), any NEW files (full contents), external-dependency build recipes (how to build each dep for this emscripten/asyncify toolchain), a threading-hazard list (grep the real files, give file:line + the exact construct + the exact fix), a modal-dialog-hazard list, the PyImport_AppendInittab lines to add, an ordered step list, and an effort/risk estimate. Put any patch files or new-file contents as separate files in that dir too. 2) Return the structured summary (the schema). Keep summary fields concise; the depth goes in plan.md. Your returned text IS the structured object. Be exhaustive and correct — token cost is not a concern. Verify claims against the actual files (use grep/read). If a dependency has no known wasm port, say so plainly and estimate the porting effort. === YOUR SCOPE: FEM (+ VTK / netgen / CalculiX) (slug: fem) === Fem is OFF and is the heaviest: needs VTK, netgen, and external solvers (CalculiX ccx) usually invoked as subprocesses. On wasm there are NO subprocesses. Assess: VTK wasm feasibility, netgen wasm, and the subprocess-solver problem (can a solver be compiled to wasm and called in-process? or is FEM effectively not-viable for now?). Give an honest verdict and effort. Write your full plan + any patch/new-file contents under /home/magik6k/lcad-wasm/porting/fem/ (create the dir; plan.md is required). Then return the structured summary with deliverableFile=/home/magik6k/lcad-wasm/porting/fem/plan.md.

Fable

thinking

I'm diving into the FreeCAD FEM module to understand its structure and what dependencies it relies on.

Fable

I'll investigate the FEM module and its dependencies in the real FreeCAD tree, then assess wasm feasibility.

Fable

⚙ Bash

{"command": "ls src/Mod/Fem/ && echo \"---GUI---\" && ls src/Mod/Fem/Gui/ 2>/dev/null | head && echo \"---APP---\" && ls src/Mod/Fem/App/ 2>/dev/null | head -50", "description": "List FEM module structure"}

tool result

App
CMakeLists.txt
CreateLabels.py
FemGlobal.h
Gui
Init.py
InitGui.py
ObjectsFem.py
TestFemApp.py
TestFemGui.py
coding_conventions.md
fem.dox
femcommands
femexamples
femguiobjects
femguiutils
feminout
femmesh
femobjects
fempreferencepages
femresult
femsolver
femtaskpanels
femtest
femtools
femviewprovider
---GUI---
AbaqusHighlighter.cpp
AbaqusHighlighter.h
ActiveAnalysisObserver.cpp
ActiveAnalysisObserver.h
AppFemGui.cpp
AppFemGuiPy.cpp
BoxWidget.ui
CMakeLists.txt
Command.cpp
CylinderWidget.ui
--  …[truncated]

Fable

⚙ Bash

{"command": "grep -iE \"BUILD_FEM|FREECAD_USE_PYSIDE|FREECAD_USE_SHIBOKEN|BUILD_SMESH|VTK|NETGEN|SMESH\" /opt/toolchains/src/freecad-gui-build/CMakeCache.txt", "description": "Check FEM-related cmake flags"}

tool result

BUILD_FEM:BOOL=OFF
//Build the FreeCAD FEM module with the NETGEN mesher
BUILD_FEM_NETGEN:BOOL=OFF
//Use system installed smesh instead of the bundled.
FREECAD_USE_EXTERNAL_SMESH:BOOL=OFF
FREECAD_USE_PYSIDE:BOOL=OFF
FREECAD_USE_SHIBOKEN:BOOL=OFF

Fable

thinking

I need to examine FEM's build configuration more closely, particularly how it handles its dependencies like VTK, SMESH, and netgen, and understand how the solver gets invoked.

Fable

⚙ Bash {"command": "sed -n '1,120p' src/Mod/Fem/CMakeLists.txt", "description": "Read FEM CMakeLists top"}

Fable

⚙ Bash {"command": "sed -n '1,150p' src/Mod/Fem/App/CMakeLists.txt", "description": "Read FEM App CMakeLists"}

tool result

if(BUILD_FEM_VTK)
    add_definitions(-DFC_USE_VTK)

    # we may use VTK but do not have the python wrappers available
    if(BUILD_FEM_VTK_PYTHON)
        add_definitions(-DFC_USE_VTK_PYTHON)
    endif(BUILD_FEM_VTK_PYTHON)

endif(BUILD_FEM_VTK)


# suppress warnings from smesh
if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_COMPILER_IS_CLANGXX)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-overloaded-virtual")
endif()


# *******************************************************************************  …[truncated]

tool result

# Many warnings caused by vtk
if(CMAKE_COMPILER_IS_CLANGXX)
    add_compile_options(-Wno-pedantic) # needed for vtk headers
    if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 4.0)
        add_compile_options(-Wno-inconsistent-missing-override)
    endif()
elseif(CMAKE_COMPILER_IS_GNUCXX)
    add_compile_options(-Wno-pedantic) # needed for vtk headers
endif()


if(BUILD_FEM_NETGEN)
    add_definitions(-DFCWithNetgen ${NETGEN_DEFINITIONS})
endif(BUILD_FEM_NETGEN)

set(Fem_LIBS
    Part
    FreeCAD  …[truncated]

Fable

thinking

I'm getting a sense of the architecture here—this is a substantial codebase with several key components working together. The main dependencies are SMESH for meshing, VTK for visualization, netgen for mesh generation, and there's a Python-based solver that spawns the actual solver executable as a subprocess. I need to trace through the femsolver directory to understand how it orchestrates the solver invocation.

Fable

⚙ Bash

{"command": "ls src/Mod/Fem/femsolver/ && echo \"===CCX===\" && ls src/Mod/Fem/femsolver/calculix/ 2>/dev/null && echo \"===run.py subprocess===\" && grep -rn \"subprocess\\|Popen\\|QProcess\\|check_output\\|os.system\" src/Mod/Fem/femsolve…

tool result

__init__.py
calculix
elmer
equationbase.py
fenics
mystran
report.py
reportdialog.py
run.py
settings.py
signal.py
solver_taskpanel.py
solverbase.py
task.py
writerbase.py
z88
===CCX===
__init__.py
calculixtools.py
calculixutils.py
write_amplitude.py
write_constraint_bodyheatsource.py
write_constraint_centrif.py
write_constraint_contact.py
write_constraint_displacement.py
write_constraint_electricchargedensity.py
write_constraint_electrostatic.py
write_constraint_finaltemperature.py
write_constrain  …[truncated]

Fable

⚙ Bash

{"command": "find src -type d -iname \"*smesh*\" 2>/dev/null; echo \"---\"; ls src/3rdParty/ 2>/dev/null; echo \"---smesh loc---\"; find src -ipath \"*smesh*\" -name CMakeLists.txt 2>/dev/null | head; echo \"---netgen refs---\"; grep -rln \…

tool result

src/3rdParty/salomesmesh
src/3rdParty/salomesmesh/src/SMESH
src/3rdParty/salomesmesh/src/SMESHDS
---
3Dconnexion
CMakeLists.txt
Clipper2
FastSignals
GSL
OndselSolver
OpenGL
PyCXX
coin
json
lazy_loader
libE57Format
libkdtree
lru-cache
pivy
salomesmesh
zipios++
---smesh loc---
src/3rdParty/salomesmesh/CMakeLists.txt
---netgen refs---
src/3rdParty/salomesmesh/inc/NETGENPlugin_Hypothesis_2D_ONLY_i.hxx
src/3rdParty/salomesmesh/inc/NETGENPlugin_NETGEN_3D_i.hxx
src/3rdParty/salomesmesh/inc/NETGENPlugin  …[truncated]

Fable

thinking

SMESH is bundled in the source tree and links against StdMeshers, SMESH, SMDS, and SMESHDS, while netgen is external and controlled by a build flag. VTK is also external. I need to check whether VTK is actually being built, look at how the solver gets invoked through run.py and task.py, determine if SMESH has built-in threading support, and understand how ccx fits into the picture.

Fable

⚙ Bash

{"command": "grep -iE \"VTK_DIR|VTK_|BUILD_FEM_VTK|Netgen|NETGEN_\" /opt/toolchains/src/freecad-gui-build/CMakeCache.txt | head -30; echo \"===which vtk libs on system?===\"; ls /opt/toolchains/ 2>/dev/null; find /opt/toolchains -iname \"*v…

Fable

⚙ Bash

{"command": "sed -n '180,260p' src/Mod/Fem/femsolver/run.py; echo \"=====task.py check_output=====\"; grep -n \"subprocess\\|Popen\\|QProcess\\|check_output\\|binary\\|executable\\|find_program\\|ccx\" src/Mod/Fem/femsolver/task.py", "descr…

tool result

//Build the FreeCAD FEM module with the NETGEN mesher
BUILD_FEM_NETGEN:BOOL=OFF
===which vtk libs on system?===
boost-wasm
emsdk
fix-freetype-sjlj.sh
fmt-wasm
freecad-gui-web
gtest-wasm
icu-wasm
include
occt-wasm
oscad-deps
oscad-src
python-wasm
qt
qt-asyncify
qt-jspi
qtsrc
rebuild-deps-407.sh
rebuild-deps-jseh.sh
rebuild-deps-wasmeh.sh
rebuild-qt-asyncify-412.sh
rebuild-qt-asyncify.sh
rebuild-qt-jspi-jseh.sh
rebuild-qt-jspi-wasmeh.sh
rebuild-qt-jspi.sh
src
venv
wasm-opt-4.0.12.bak
xerces-wasm
y  …[truncated]

tool result

            error_message = "Selected working directory doesn't exist."
            App.Console.PrintError(error_message + "\n")
            if App.GuiUp:
                QtGui.QMessageBox.critical(
                    FreeCADGui.getMainWindow(), "Can't start Solver", error_message
                )
            return
        if not machine.running:
            machine.reset()
            machine.target = RESULTS
            machine.start()
            machine.join()  # wait for the machine to f  …[truncated]

Fable

thinking

I'm seeing some critical blockers here. VTK isn't built anywhere in the toolchain and there's no WebAssembly version of it. Netgen is disabled, and the solver relies on threading with `machine.start()` and `machine.join()` plus spawning external processes through QProcess to run the CCX solver—none of which work in WebAssembly. I need to dig into how the Machine class handles threading and what SMESH threading looks like to understand the full scope of what needs to change.

Fable

⚙ Bash

{"command": "grep -n \"class Machine\\|QThread\\|threading\\|Thread\\|def start\\|def join\\|def run\\|isRunning\\|self.thread\\|Signal\\|def reset\" src/Mod/Fem/femsolver/run.py | head -40; echo \"===head of run.py===\"; sed -n '1,60p' src…

tool result

30:supported by the fem workbench. The threading and communication support is
46:# import threading  # not used ATM
77:def run_fem_solver(solver, working_dir=None, blocking=False):
351:class BaseTask(task.Thread):
364:class Machine(BaseTask):
385:    def run(self):
401:    def reset(self, newState=CHECK):
===head of run.py===
# ***************************************************************************
# *   Copyright (c) 2017 Markus Hovorka <m.hovorka@live.de>                 *
# *   Copyright   …[truncated]

Fable

⚙ Bash

{"command": "sed -n '340,420p' src/Mod/Fem/femsolver/calculix/calculixtools.py", "description": "Read ccx QProcess invocation"}

tool result

                # max abs principal stress
                max_abs_sigma = np.max(np.abs(np.array([sigma_1, sigma_2, sigma_3])), axis=0)
                max_abs_sigma_vtk = vtk_np.numpy_to_vtk(max_abs_sigma)
                max_abs_sigma_vtk.SetName("Maximum Absolute Principal Stress")
                pd.AddArray(max_abs_sigma_vtk)

            mb_out = vtkMultiBlockDataSet()
            mb_out.DeepCopy(mb)

            return mb_out

        except Exception as e:
            # return original   …[truncated]

Fable

thinking

I need to examine the Thread base class in task.py to understand the threading mechanism, and also look at how femmesh uses gmsh as a subprocess mesher.

Fable

⚙ Bash

{"command": "grep -n \"class Thread\\|QThread\\|threading\\|def start\\|def join\\|def run\\|Signal\\|import\" src/Mod/Fem/femsolver/task.py | head -40; echo \"===gmsh subprocess===\"; grep -rn \"subprocess\\|Popen\\|QProcess\\|gmsh_bin\\|f…

tool result

32:import threading
33:import time
35:from . import report
36:from . import signal
82:    def start(self):
93:    def run(self):
96:    def join(self):
122:class Thread(Task):
128:    def start(self):
130:        self._thread = threading.Thread(target=self.protector)
135:    def join(self):
145:        thread = threading.Thread(target=waitForStop)
===gmsh subprocess===
src/Mod/Fem/femmesh/gmshtools.py:33:import subprocess
src/Mod/Fem/femmesh/gmshtools.py:36:from PySide.QtCore import QProcess, QT  …[truncated]

Fable

⚙ Bash

{"command": "sed -n '1,120p' src/3rdParty/salomesmesh/CMakeLists.txt | grep -niE \"thread|pthread|boost|tbb|omp|openmp|parallel\" ; echo \"===SMESH threading grep===\"; grep -rniE \"std::thread|std::async|QThread|pthread|#include <thread>|b…

tool result

10:if(CMAKE_COMPILER_IS_GNUCXX)
11:    set(CMAKE_CXX_FLAGS " ${CMAKE_CXX_FLAGS} -Wno-sign-compare -Wno-reorder -Wno-switch -Wno-unused-variable -Wno-unused-but-set-variable -Wno-comment -Wno-unused-parameter -Wno-empty-body -Wno-pedantic")
15:    check_cxx_compiler_flag("-Wno-unused-result" _flag_found)
22:    check_cxx_compiler_flag("-Wno-cast-function-type" _flag_found)
29:    check_cxx_compiler_flag("-Wno-maybe-uninitialized" _flag_found)
35:    check_cxx_compiler_flag("-Wno-missing-field-ini  …[truncated]

Fable

thinking

I'm spotting a potential threading issue in SMESH_Mesh.cpp where boost::thread is being used with a bind operation to delete mesh data structures—that could cause race conditions. I need to examine that code block more closely, and also check how TBB is being used in StdMeshers_Cartesian_3D.cpp to see if it's properly guarded by preprocessor directives.

Fable

⚙ Bash

{"command": "sed -n '215,245p' src/3rdParty/salomesmesh/src/SMESH/SMESH_Mesh.cpp; echo \"===TBB guard===\"; grep -n \"WITH_TBB\\|ifdef.*TBB\\|HAVE_TBB\\|#include.*tbb\\|SMESH_PARALLEL\" src/3rdParty/salomesmesh/src/StdMeshers/StdMeshers_Car…

tool result

  // remove self from studyContext
  if ( _gen )
  {
    StudyContextStruct * studyContext = _gen->GetStudyContext( _studyId );
    studyContext->mapMesh.erase( _id );
  }
  if ( _myDocument )
    _myDocument->RemoveMesh( _id );
  _myDocument = 0;

  if ( _myMeshDS ) {
    // delete _myMeshDS, in a thread in order not to block closing a study with large meshes
#ifndef WIN32
    boost::thread aThread(boost::bind( & deleteMeshDS, _myMeshDS ));
#else
    boost::thread aThread(boost::bind( & deleteM  …[truncated]

Fable

⚙ Bash

{"command": "echo \"===FemMesh netgen refs in FreeCAD App===\"; grep -rn \"FCWithNetgen\\|NETGENPlugin\\|netgen\" src/Mod/Fem/App/*.cpp | head; echo \"===VTK includes in FemVTKTools===\"; grep -c \"vtk\" src/Mod/Fem/App/FemVTKTools.cpp; ech…

tool result

===FemMesh netgen refs in FreeCAD App===
src/Mod/Fem/App/FemMeshShapeNetgenObject.cpp:29:#ifdef FCWithNetgen
src/Mod/Fem/App/FemMeshShapeNetgenObject.cpp:30:# include <NETGENPlugin_Hypothesis.hxx>
src/Mod/Fem/App/FemMeshShapeNetgenObject.cpp:31:# include <NETGENPlugin_Mesher.hxx>
src/Mod/Fem/App/FemMeshShapeNetgenObject.cpp:85:#ifdef FCWithNetgen
src/Mod/Fem/App/FemMeshShapeNetgenObject.cpp:96:    NETGENPlugin_Mesher myNetGenMesher(newMesh.getSMesh(), shape, true);
src/Mod/Fem/App/FemMeshShapeNe  …[truncated]

Fable

thinking

I'm seeing the core issues now. The main problem is that SMESH_Mesh.cpp uses boost::thread in its destructor for async deletion, which causes hangs in WebAssembly—I need to make that synchronous when compiling for Emscripten. TBB isn't a concern since WITH_TBB isn't enabled by default. VTK is a bigger issue though: FemVTKTools.cpp pulls in over 200 VTK includes and is only needed for FemPost result visualization, so that's a significant dependency to manage.

The real blockers are the solvers and meshing tools. All the solvers (ccx, elmer, z88, mystran) spawn subprocesses via QProcess, which simply doesn't work in WebAssembly. The solver framework itself uses Python threading and machine.joi  …

Fable

⚙ Bash

{"command": "echo \"===Fem linked into anything already? search FreeCADApp/Gui links===\"; grep -rn \"salomesmesh\\|add_subdirectory(3rdParty\" src/3rdParty/CMakeLists.txt 2>/dev/null | head; grep -n \"salomesmesh\\|BUILD_FEM\" src/CMakeLis…

Fable

⚙ Bash

{"command": "echo \"===Other threading hazards in Fem App/Gui C++===\"; grep -rniE \"std::thread|std::async|QThread|QtConcurrent|QThreadPool|boost::thread|processEvents\" src/Mod/Fem/App src/Mod/Fem/Gui 2>/dev/null | grep -v \"\\.py:\" | he…

tool result

===Fem linked into anything already? search FreeCADApp/Gui links===
src/3rdParty/CMakeLists.txt:5:    add_subdirectory(salomesmesh)
===SMESH boost deps===
===is 3rdParty/salomesmesh gated by BUILD_FEM?===
src/3rdParty/CMakeLists.txt:5:    add_subdirectory(salomesmesh)

tool result

===Other threading hazards in Fem App/Gui C++===
src/Mod/Fem/Gui/DlgSettingsFemCcxImp.cpp:28:#include <QThread>
src/Mod/Fem/Gui/DlgSettingsFemCcxImp.cpp:108:    ui->sb_ccx_numcpu->setValue(QThread::idealThreadCount());
src/Mod/Fem/Gui/DlgSettingsFemGmshImp.cpp:27:#include <QThread>
src/Mod/Fem/Gui/DlgSettingsFemGmshImp.cpp:67:    ui->sb_threads->setValue(hGrp->GetInt(ui->sb_threads->entryName(), QThread::idealThreadCount()));
src/Mod/Fem/Gui/PreCompiled.h:77:#include <QThread>
===modal exec in F  …[truncated]

Fable

thinking

I need to verify whether SMESH is actually being built in the wasm build by checking the build directory for its artifacts, since the unconditional add_subdirectory call might still be gated elsewhere. Also, QThread::idealThreadCount() returning 1 should be fine for this context.

Fable

⚙ Bash

{"command": "sed -n '1,15p' src/3rdParty/CMakeLists.txt; echo \"===built SMESH artifacts in wasm build?===\"; find /opt/toolchains/src/freecad-gui-build -iname \"*SMESH*\" -o -iname \"libSMDS*\" 2>/dev/null | head; find /opt/toolchains/src/…

tool result

add_subdirectory(FastSignals)

# Build SalomeMesh for all Platforms since heavily patched
if (BUILD_SMESH)
    add_subdirectory(salomesmesh)
endif()

add_subdirectory(lazy_loader)

if(NOT FREECAD_USE_EXTERNAL_E57FORMAT)
    add_subdirectory(libE57Format)
endif()

if(BUILD_MATERIAL_EXTERNAL)
    add_subdirectory(lru-cache)
===built SMESH artifacts in wasm build?===

Fable

⚙ Bash

{"command": "mkdir -p /home/magik6k/lcad-wasm/porting/fem; echo \"===result import path (no-VTK) exists?===\"; grep -rn \"import_fem_result\\|readResult\\|FrdResult\\|frdtools\\|read_frd\" src/Mod/Fem/feminout/*.py | head; ls src/Mod/Fem/fe…

tool result

===result import path (no-VTK) exists?===
src/Mod/Fem/feminout/importCcxDatResults.py:63:    r = readResult(filename)
src/Mod/Fem/feminout/importCcxDatResults.py:68:def readResult(dat_input):
src/Mod/Fem/feminout/importVTKResults.py:132:    # readResult always creates a new femmesh named ResultMesh
src/Mod/Fem/feminout/importVTKResults.py:133:    Fem.readResult(filename, result_obj.Name)
src/Mod/Fem/feminout/importVTKResults.py:135:    # add missing DisplacementLengths (They should have been add  …[truncated]

Fable

thinking

SMESH is controlled by the BUILD_SMESH flag, which is probably disabled since FEM is off. The .frd result reader is pure Python that parses Calculix output without needing VTK, so results can be visualized through the legacy mesh approach, though the GUI import still requires PySide. The parser converts .frd files directly into FemMeshResult objects without any subprocess calls.

Now I need to check the BUILD_SMESH cache value and verify what language Calculix uses, then I can lay out the full plan.

Fable

⚙ Bash

{"command": "grep -iE \"BUILD_SMESH|BUILD_GUI|FREECAD_USE_QT\" /opt/toolchains/src/freecad-gui-build/CMakeCache.txt | head; echo \"===PyImport inittab current Fem?===\"; grep -in \"fem\\|Fem\" src/Main/WasmInittab.cpp src/Main/WasmInittabGu…

tool result

BUILD_GUI:BOOL=ON
FREECAD_USE_QT_DIALOGS:BOOL=OFF
===PyImport inittab current Fem?===
===how modules registered example (Part)===
ugrep: warning: src/Main/WasmInittab.cpp: No such file or directory

Fable

⚙ Bash

{"command": "find src/Main -iname \"*Inittab*\"; echo \"===\"; ls src/Main/ | grep -i wasm; echo \"===search generated inittab===\"; find /opt/toolchains/src/freecad-gui-build -iname \"*Inittab*\" 2>/dev/null | head; echo \"===MainGui initt…

tool result

===
===search generated inittab===
/opt/toolchains/src/freecad-gui-build/src/Main/WasmInittabGui.cpp
/opt/toolchains/src/freecad-gui-build/src/Main/WasmInittab.cpp
/opt/toolchains/src/freecad-gui-build/src/Main/CMakeFiles/FreeCADMain.dir/WasmInittabGui.cpp.o
===MainGui inittab func===
154:// Generated WasmInittabGui.cpp: registers statically linked Python extension
156:void freecadWasmRegisterInittab();
199:    freecadWasmRegisterInittab();

Fable

⚙ Bash

{"command": "sed -n '1,80p' /opt/toolchains/src/freecad-gui-build/src/Main/WasmInittabGui.cpp", "description": "Read generated inittab to see registration pattern"}

tool result

// Generated by src/Main/CMakeLists.txt (wasm port)
#include <Python.h>
extern "C" PyObject* PyInit_Part();
extern "C" PyObject* PyInit_Sketcher();
extern "C" PyObject* PyInit_Materials();
extern "C" PyObject* PyInit_PartGui();
extern "C" PyObject* PyInit_SketcherGui();
extern "C" PyObject* PyInit_MatGui();
extern "C" PyObject* PyInit_StartGui();
void freecadWasmRegisterInittab()
{
    PyImport_AppendInittab("Part", PyInit_Part);
    PyImport_AppendInittab("Sketcher", PyInit_Sketcher);
    PyImp  …[truncated]

Fable

thinking

I need to trace through the CMakeLists.txt generation in the Main directory to understand how to properly integrate the Fem/FemGui module, and I should also look up the CalculiX language reference to fill in any gaps in my understanding.

Fable

⚙ Bash

{"command": "grep -n \"Inittab\\|PyInit\\|AppendInittab\\|WASM_MODULES\\|foreach\\|Part\\|Sketcher\\|Fem\" src/Main/CMakeLists.txt | head -40", "description": "Read inittab generation logic"}

tool result

14:        list(APPEND FREECAD_WASM_PY_MODULES Part)
15:        list(APPEND FREECAD_WASM_PY_GUI_MODULES PartGui)
18:        list(APPEND FREECAD_WASM_PY_MODULES Sketcher)
19:        list(APPEND FREECAD_WASM_PY_GUI_MODULES SketcherGui)
22:        list(APPEND FREECAD_WASM_PY_MODULES PartDesign)
23:        list(APPEND FREECAD_WASM_PY_GUI_MODULES PartDesignGui)
47:        foreach(_mod IN LISTS ARGN)
48:            string(APPEND _decls "extern \"C\" PyObject* PyInit_${_mod}();\n")
49:            strin  …[truncated]

Fable

⚙ Bash {"command": "sed -n '1,70p' src/Main/CMakeLists.txt", "description": "Read Main CMakeLists inittab section fully"}

tool result

# SPDX-License-Identifier: LGPL-2.1-or-later

configure_file(freecad.rc.cmake ${CMAKE_CURRENT_BINARY_DIR}/freecad.rc)
configure_file(freecadCmd.rc.cmake ${CMAKE_CURRENT_BINARY_DIR}/freecadCmd.rc)
file(COPY icon.ico DESTINATION ${CMAKE_CURRENT_BINARY_DIR})


if(EMSCRIPTEN)
    # Python extension modules are linked statically into the executables and
    # must be registered on the interpreter's inittab before Py_Initialize().
    set(FREECAD_WASM_PY_MODULES "")
    set(FREECAD_WASM_PY_GUI_MODULES  …[truncated]

Fable

thinking

I'm verifying that CalculiX is written in Fortran with a C driver and checking its dependencies like SPOOLES and ARPACK, then confirming the module registration names for Fem and FemGui.

Fable

⚙ Bash

{"command": "grep -n \"PyInit_Fem\\|initFem\\|PyMODINIT\\|PyModuleDef\\|\\\"Fem\\\"\" src/Mod/Fem/App/AppFem.cpp | head; echo \"===GUI===\"; grep -n \"PyInit_FemGui\\|\\\"FemGui\\\"\" src/Mod/Fem/Gui/AppFemGui.cpp | head; echo \"===Init.py …

tool result

===GUI===
===Init.py PySide import at module load?===
33:All imports made there are available here too.
34:Thus no need to import them here.
35:But the import code line is used anyway to get flake8 quired.
36:Since they are cached they will not be imported twice.
43:# imports to get flake8 quired
44:import sys
45:import FreeCAD
47:# needed imports
48:from femtools.migrate_app import FemMigrateApp
60:# add import and export file types
===InitGui imports===
33:All imports made there are available   …[truncated]

Fable

⚙ Bash

{"command": "grep -rn \"PyInit_Fem\\b\\|PyInit_Fem\\\"\" src/Mod/Fem/App/*.cpp; grep -rn \"initModule\\|Py_InitModule\\|PyInit\\|MODINIT\\|module.*Fem\" src/Mod/Fem/App/AppFemPy.cpp | head; echo \"===check macro===\"; grep -rn \"PyMOD\\|PyI…

tool result

src/Mod/Fem/App/AppFemPy.cpp:119:        initialize("This module is the Fem module.");  // register with Python
src/Mod/Fem/App/AppFemPy.cpp:428:PyObject* initModule()
===check macro===
src/Mod/Fem/App/AppFem.cpp:31:#include "FemAnalysis.h"
src/Mod/Fem/App/AppFem.cpp:32:#include "FemConstraintBearing.h"
src/Mod/Fem/App/AppFem.cpp:33:#include "FemConstraintContact.h"
src/Mod/Fem/App/AppFem.cpp:34:#include "FemConstraintDisplacement.h"
src/Mod/Fem/App/AppFem.cpp:35:#include "FemConstraintFixed.h"
  …[truncated]

Fable

⚙ Bash

{"command": "grep -n \"PyMOD_INIT_FUNC\\|PyInit_Fem\\|initFem\\|PyInit\\|_FemGui\\|FemExport\" src/Mod/Fem/App/AppFem.cpp | head; echo \"===gui===\"; grep -n \"PyInit\\|initFemGui\\|PyMOD\" src/Mod/Fem/Gui/AppFemGui.cpp | head", "descriptio…

tool result

80:PyMOD_INIT_FUNC(Fem)
===gui===
99:PyMOD_INIT_FUNC(FemGui)
103:        PyMOD_Return(nullptr);
210:    PyMOD_Return(mod);

Fable

thinking

The macro expansions confirm the Python module initialization functions are correct — `PyInit_Fem` and `PyInit_FemGui`. Now I'm ready to document the full assessment and lay out the viability tiers for FEM in WebAssembly, starting with the complete picture of what's feasible and what isn't.

Fable

Now I have a complete, grounded picture. Let me write the plan.

Fable

⚙ Write

{"file_path": "/home/magik6k/lcad-wasm/porting/fem/plan.md", "content": "# FreeCAD FEM Workbench → WebAssembly: Feasibility Plan & Verdict\n\nScope slug: `fem`. Source tree: `/home/magik6k/lcad-wasm/freecad-port/FreeCAD` (branch `wasm-port`…

tool result

File created successfully at: /home/magik6k/lcad-wasm/porting/fem/plan.md (file state is current in your context — no need to Read it back)

Fable

⚙ Write

{"file_path": "/home/magik6k/lcad-wasm/porting/fem/patches/smesh_mesh_thread.patch", "content": "--- a/src/3rdParty/salomesmesh/src/SMESH/SMESH_Mesh.cpp\n+++ b/src/3rdParty/salomesmesh/src/SMESH/SMESH_Mesh.cpp\n@@ -226,11 +226,15 @@\n   if …

tool result

File created successfully at: /home/magik6k/lcad-wasm/porting/fem/patches/smesh_mesh_thread.patch (file state is current in your context — no need to Read it back)

Fable

thinking

I'm verifying the patch line numbers match the actual code location around lines 226-238, where the `#ifndef WIN32` preprocessor directive and boost::thread references are found. The context lines align well enough for this to be a valid patch.

Fable

Plan and patch written. Now the structured summary.

Fable

⚙ StructuredOutput

{"slug": "fem", "title": "FreeCAD FEM (+VTK / netgen / CalculiX) → WebAssembly", "feasibility": "not-viable-wasm", "oneLineVerdict": "A working FEM analysis workflow is not viable on this wasm target: all solvers are subprocesses (no fork/e…

tool result

Structured output provided successfully