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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// A few wrappers for stack-manipulation. This version of the module
// is used in chrome code.
"use strict";
(function (factory) {
// This file might be require()d, but might also be loaded via
// Cu.import. Account for the differences here.
if (this.module && module.id.indexOf("stack") >= 0) {
// require.
const {components, Cu} = require("chrome");
factory.call(this, components, Cu, exports);
} else {
// Cu.import.
this.isWorker = false;
factory.call(this, Components, Components.utils, this);
this.EXPORTED_SYMBOLS = ["callFunctionWithAsyncStack", "describeNthCaller",
"getStack"];
}
}).call(this, function (components, Cu, exports) {
/**
* Return a description of the Nth caller, suitable for logging.
*
* @param {Number} n the caller to describe
* @return {String} a description of the nth caller.
*/
function describeNthCaller(n) {
if (isWorker) {
return "";
}
let caller = components.stack;
// Do one extra iteration to skip this function.
while (n >= 0) {
--n;
caller = caller.caller;
}
let func = caller.name;
let file = caller.filename;
if (file.includes(" -> ")) {
file = caller.filename.split(/ -> /)[1];
}
let path = file + ":" + caller.lineNumber;
return func + "() -> " + path;
}
/**
* Return a stack object that can be serialized and, when
* deserialized, passed to callFunctionWithAsyncStack.
*/
function getStack() {
return components.stack.caller;
}
/**
* Like Cu.callFunctionWithAsyncStack but handles the isWorker case
* -- |Cu| isn't defined in workers.
*/
function callFunctionWithAsyncStack(callee, stack, id) {
if (isWorker) {
return callee();
}
return Cu.callFunctionWithAsyncStack(callee, stack, id);
}
exports.callFunctionWithAsyncStack = callFunctionWithAsyncStack;
exports.describeNthCaller = describeNthCaller;
exports.getStack = getStack;
});
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