36 lines
1.2 KiB
JavaScript
36 lines
1.2 KiB
JavaScript
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// Minimal Asyncify harness: drive one unwind/rewind through $vt and check it yields 50.
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const fs = require('fs');
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const path = process.argv[2];
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const BUF = 16, STACK = 1024, STACK_END = 16384;
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let inst, rewinding = false, pending = 0;
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const imports = {
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env: {
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sleep: (ms) => {
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if (!rewinding) {
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inst.exports.asyncify_start_unwind(BUF);
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pending = ms;
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return 0; // dummy; value is discarded as we unwind
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} else {
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inst.exports.asyncify_stop_rewind();
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rewinding = false;
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return pending; // real value supplied on rewind
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}
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},
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},
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};
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const mod = new WebAssembly.Module(fs.readFileSync(path));
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inst = new WebAssembly.Instance(mod, imports);
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// asyncify buffer struct: [current, end]
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const mem = new Int32Array(inst.exports.memory.buffer);
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mem[BUF >> 2] = STACK;
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mem[(BUF + 4) >> 2] = STACK_END;
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inst.exports.vt(); // runs, throws, catch calls sleep -> starts unwind, returns
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inst.exports.asyncify_stop_unwind();
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inst.exports.asyncify_start_rewind(BUF);
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rewinding = true;
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const r = inst.exports.vt(); // rewinds into the catch handler; sleep returns 50; vt completes
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console.log('vt result =', r);
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process.exit(r === 50 ? 0 : 1);
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