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db1e5827c4
Modifies the behavior of the interpreter on crash under Emscripten: 1. No Python traceback shown on segfault/trap 2. The JavaScript source line is shown The JavaScript source line is super long and completely unenlightening, whereas the Python traceback is very helpful.
58 lines
1.7 KiB
JavaScript
58 lines
1.7 KiB
JavaScript
import EmscriptenModule from "./python.mjs";
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import fs from "node:fs";
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if (process?.versions?.node) {
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const nodeVersion = Number(process.versions.node.split(".", 1)[0]);
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if (nodeVersion < 18) {
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process.stderr.write(
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`Node version must be >= 18, got version ${process.version}\n`,
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);
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process.exit(1);
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}
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}
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function rootDirsToMount(Module) {
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return fs
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.readdirSync("/")
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.filter((dir) => !["dev", "lib", "proc"].includes(dir))
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.map((dir) => "/" + dir);
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}
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function mountDirectories(Module) {
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for (const dir of rootDirsToMount(Module)) {
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Module.FS.mkdirTree(dir);
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Module.FS.mount(Module.FS.filesystems.NODEFS, { root: dir }, dir);
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}
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}
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const thisProgram = "--this-program=";
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const thisProgramIndex = process.argv.findIndex((x) =>
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x.startsWith(thisProgram),
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);
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const settings = {
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preRun(Module) {
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// Globally expose API object so we can access it if we raise on startup.
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globalThis.Module = Module;
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mountDirectories(Module);
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Module.FS.chdir(process.cwd());
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Object.assign(Module.ENV, process.env);
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delete Module.ENV.PATH;
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},
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// Ensure that sys.executable, sys._base_executable, etc point to python.sh
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// not to this file. To properly handle symlinks, python.sh needs to compute
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// its own path.
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thisProgram: process.argv[thisProgramIndex].slice(thisProgram.length),
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// After python.sh come the arguments thatthe user passed to python.sh.
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arguments: process.argv.slice(thisProgramIndex + 1),
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};
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try {
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await EmscriptenModule(settings);
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} catch(e) {
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// Show JavaScript exception and traceback
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console.warn(e);
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// Show Python exception and traceback
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Module.__Py_DumpTraceback(2, Module._PyGILState_GetThisThreadState());
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process.exit(1);
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}
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