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108 lines
3.2 KiB
108 lines
3.2 KiB
4 years ago
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const readWasm = require("../lib/read-wasm");
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/**
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* Provide the JIT with a nice shape / hidden class.
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*/
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function Mapping() {
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this.generatedLine = 0;
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this.generatedColumn = 0;
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this.lastGeneratedColumn = null;
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this.source = null;
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this.originalLine = null;
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this.originalColumn = null;
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this.name = null;
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}
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let cachedWasm = null;
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module.exports = function wasm() {
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if (cachedWasm) {
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return cachedWasm;
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}
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const callbackStack = [];
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cachedWasm = readWasm().then(buffer => {
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return WebAssembly.instantiate(buffer, {
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env: {
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mapping_callback(
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generatedLine,
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generatedColumn,
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hasLastGeneratedColumn,
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lastGeneratedColumn,
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hasOriginal,
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source,
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originalLine,
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originalColumn,
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hasName,
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name
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) {
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const mapping = new Mapping();
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// JS uses 1-based line numbers, wasm uses 0-based.
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mapping.generatedLine = generatedLine + 1;
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mapping.generatedColumn = generatedColumn;
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if (hasLastGeneratedColumn) {
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// JS uses inclusive last generated column, wasm uses exclusive.
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mapping.lastGeneratedColumn = lastGeneratedColumn - 1;
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}
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if (hasOriginal) {
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mapping.source = source;
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// JS uses 1-based line numbers, wasm uses 0-based.
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mapping.originalLine = originalLine + 1;
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mapping.originalColumn = originalColumn;
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if (hasName) {
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mapping.name = name;
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}
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}
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callbackStack[callbackStack.length - 1](mapping);
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},
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start_all_generated_locations_for() { console.time("all_generated_locations_for"); },
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end_all_generated_locations_for() { console.timeEnd("all_generated_locations_for"); },
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start_compute_column_spans() { console.time("compute_column_spans"); },
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end_compute_column_spans() { console.timeEnd("compute_column_spans"); },
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start_generated_location_for() { console.time("generated_location_for"); },
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end_generated_location_for() { console.timeEnd("generated_location_for"); },
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start_original_location_for() { console.time("original_location_for"); },
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end_original_location_for() { console.timeEnd("original_location_for"); },
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start_parse_mappings() { console.time("parse_mappings"); },
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end_parse_mappings() { console.timeEnd("parse_mappings"); },
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start_sort_by_generated_location() { console.time("sort_by_generated_location"); },
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end_sort_by_generated_location() { console.timeEnd("sort_by_generated_location"); },
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start_sort_by_original_location() { console.time("sort_by_original_location"); },
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end_sort_by_original_location() { console.timeEnd("sort_by_original_location"); },
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}
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});
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}).then(Wasm => {
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return {
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exports: Wasm.instance.exports,
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withMappingCallback: (mappingCallback, f) => {
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callbackStack.push(mappingCallback);
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try {
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f();
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} finally {
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callbackStack.pop();
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}
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}
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};
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}).then(null, e => {
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cachedWasm = null;
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throw e;
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});
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return cachedWasm;
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};
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