gh-127111: Emscripten Make web example work again #127113
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hoodmane
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freakboy3742,
erlend-aasland and
corona10
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hoodmane
commented
Nov 21, 2024
Comment on lines
-17
to
-22
| extensions_map = server.SimpleHTTPRequestHandler.extensions_map.copy() | ||
| extensions_map.update( | ||
| { | ||
| ".wasm": "application/wasm", | ||
| } | ||
| ) |
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This is now the default behavior of SimpleHTTPRequestHandler.
hoodmane
commented
Nov 21, 2024
| @@ -2321,14 +2325,14 @@ AS_CASE([$ac_sys_system], | |||
| AS_VAR_IF([Py_DEBUG], [yes], [wasm_debug=yes], [wasm_debug=no]) | |||
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| dnl Start with 20 MB and allow to grow | |||
| AS_VAR_APPEND([LDFLAGS_NODIST], [" -sALLOW_MEMORY_GROWTH -sTOTAL_MEMORY=20971520"]) | |||
| AS_VAR_APPEND([LDFLAGS_NODIST], [" -sALLOW_MEMORY_GROWTH -sINITIAL_MEMORY=20971520"]) | |||
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This setting has changed names. It's not really relevant to this PR, I could separate it into a separate NFC commit.
hoodmane
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hoodmane
commented
Nov 21, 2024
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| dnl map int64_t and uint64_t to JS bigint | ||
| AS_VAR_APPEND([LDFLAGS_NODIST], [" -sWASM_BIGINT"]) | ||
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| dnl Include file system support | ||
| AS_VAR_APPEND([LDFLAGS_NODIST], [" -sFORCE_FILESYSTEM -lidbfs.js -lnodefs.js -lproxyfs.js -lworkerfs.js"]) | ||
| AS_VAR_APPEND([LDFLAGS_NODIST], [" -sEXPORTED_RUNTIME_METHODS=FS"]) | ||
| AS_VAR_APPEND([LDFLAGS_NODIST], [" -sEXPORTED_RUNTIME_METHODS=FS,callMain"]) |
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We use callMain in python.worker.mjs now so we need to ask for it to be exported.
hoodmane
commented
Nov 21, 2024
| @@ -2339,7 +2343,6 @@ AS_CASE([$ac_sys_system], | |||
| AS_VAR_APPEND([LDFLAGS_NODIST], [" -sUSE_PTHREADS"]) | |||
| AS_VAR_APPEND([LINKFORSHARED], [" -sPROXY_TO_PTHREAD"]) | |||
| ]) | |||
| AS_VAR_APPEND([LDFLAGS_NODIST], [" -sALLOW_MEMORY_GROWTH"]) | |||
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We also set this on line 2328. It's harmless but unnecessary to set it twice.
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I moved the web example from `Tools/wasm` into `Tools/wasm/emscripten/web_example`. I also added a new target `build_emscripten` which is `build_wasm` but also builds the web_example. The web_example needs: 1. python.html, copied 2. python.worker.mjs copied 3. python.mjs and python.wasm output from the main linking of the Python interpreter 4. The webserver that sets COOP and COEP 5. python3.14.zip This last is created by the `wasm_assets.py` script, which required a pretty small set of changes to work fine for us. The last thing that should be done is the `python.worker.mjs` script should be made independent of the Python version: currently 3.14 is hard coded. I ran into trouble doing this, so maybe I can leave it to a followup.
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I moved the web example from
Tools/wasmintoTools/wasm/emscripten/web_example. I also added a new targetbuild_emscriptenwhich isbuild_wasmbut also builds the web_example. The web_example needs:This last is created by the
wasm_assets.pyscript, which required a pretty small set of changes to work fine for us.The last thing that should be done is the
python.worker.mjsscript should be made independent of the Python version: currently 3.14 is hard coded. I ran into trouble doing this, so maybe I can leave it to a followup.