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