jiapengyu
139 lines
3.5 KiB
JavaScript
139 lines
3.5 KiB
JavaScript
const readWasm = require('./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()
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.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() {
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console.time('all_generated_locations_for')
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},
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end_all_generated_locations_for() {
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console.timeEnd('all_generated_locations_for')
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},
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start_compute_column_spans() {
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console.time('compute_column_spans')
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},
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end_compute_column_spans() {
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console.timeEnd('compute_column_spans')
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},
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start_generated_location_for() {
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console.time('generated_location_for')
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},
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end_generated_location_for() {
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console.timeEnd('generated_location_for')
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},
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start_original_location_for() {
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console.time('original_location_for')
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},
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end_original_location_for() {
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console.timeEnd('original_location_for')
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},
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start_parse_mappings() {
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console.time('parse_mappings')
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},
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end_parse_mappings() {
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console.timeEnd('parse_mappings')
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},
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start_sort_by_generated_location() {
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console.time('sort_by_generated_location')
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},
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end_sort_by_generated_location() {
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console.timeEnd('sort_by_generated_location')
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},
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start_sort_by_original_location() {
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console.time('sort_by_original_location')
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},
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end_sort_by_original_location() {
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console.timeEnd('sort_by_original_location')
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},
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},
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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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})
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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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