55 lines
1.2 KiB
JavaScript
55 lines
1.2 KiB
JavaScript
// Usage:
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// 1. import { wasi_trace } from './wasi_trace.js';
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// 2. Pass wasi_trace as an import object to WebAssembly.instantiate
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// 3. Call wasi_trace.init(instance) after instantiation
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var instance;
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var wasi_snapshot_preview1 = {
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fd_close: function () {
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return 8;
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},
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fd_seek: function () {
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return 8;
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},
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fd_fdstat_get: function (fd, stat) {
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// needed for isatty() to enable line buffering for stdout
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var heap = new DataView(instance.exports.memory.buffer);
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heap.setUint8(stat, 2);
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for (var i = 1; i < 24; ++i) heap.setUint8(stat + i, 0);
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return 0;
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},
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fd_write: function (fd, iovs, iovs_len, nwritten) {
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var heap = new DataView(instance.exports.memory.buffer);
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var written = 0;
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var str = '';
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for (var i = 0; i < iovs_len; ++i) {
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var buf = heap.getUint32(iovs + 8 * i + 0, true);
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var buf_len = heap.getUint32(iovs + 8 * i + 4, true);
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var buf_data = new Uint8Array(heap.buffer, buf, buf_len);
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for (var j = 0; j < buf_data.length; ++j) {
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str += String.fromCharCode(buf_data[j]);
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}
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written += buf_len;
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}
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console.log(str);
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heap.setUint32(nwritten, written, true);
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return 0;
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},
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};
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var wasi_trace = {
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wasi_snapshot_preview1,
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init: function (inst) {
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instance = inst;
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},
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};
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export { wasi_trace };
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