/**
* Copyright (c) 2014-present, Facebook, Inc. * * This source code is licensed under the MIT license found in the * LICENSE file in the root directory of this source tree. */
import assert from “assert”; import { Emitter } from “./emit”; import { inherits } from “util”; import { getTypes } from “./util”;
function Entry() {
assert.ok(this instanceof Entry);
}
function FunctionEntry(returnLoc) {
Entry.call(this); getTypes().assertLiteral(returnLoc); this.returnLoc = returnLoc;
}
inherits(FunctionEntry, Entry); exports.FunctionEntry = FunctionEntry;
function LoopEntry(breakLoc, continueLoc, label) {
Entry.call(this); const t = getTypes(); t.assertLiteral(breakLoc); t.assertLiteral(continueLoc); if (label) { t.assertIdentifier(label); } else { label = null; } this.breakLoc = breakLoc; this.continueLoc = continueLoc; this.label = label;
}
inherits(LoopEntry, Entry); exports.LoopEntry = LoopEntry;
function SwitchEntry(breakLoc) {
Entry.call(this); getTypes().assertLiteral(breakLoc); this.breakLoc = breakLoc;
}
inherits(SwitchEntry, Entry); exports.SwitchEntry = SwitchEntry;
function TryEntry(firstLoc, catchEntry, finallyEntry) {
Entry.call(this); const t = getTypes(); t.assertLiteral(firstLoc); if (catchEntry) { assert.ok(catchEntry instanceof CatchEntry); } else { catchEntry = null; } if (finallyEntry) { assert.ok(finallyEntry instanceof FinallyEntry); } else { finallyEntry = null; } // Have to have one or the other (or both). assert.ok(catchEntry || finallyEntry); this.firstLoc = firstLoc; this.catchEntry = catchEntry; this.finallyEntry = finallyEntry;
}
inherits(TryEntry, Entry); exports.TryEntry = TryEntry;
function CatchEntry(firstLoc, paramId) {
Entry.call(this); const t = getTypes(); t.assertLiteral(firstLoc); t.assertIdentifier(paramId); this.firstLoc = firstLoc; this.paramId = paramId;
}
inherits(CatchEntry, Entry); exports.CatchEntry = CatchEntry;
function FinallyEntry(firstLoc, afterLoc) {
Entry.call(this); const t = getTypes(); t.assertLiteral(firstLoc); t.assertLiteral(afterLoc); this.firstLoc = firstLoc; this.afterLoc = afterLoc;
}
inherits(FinallyEntry, Entry); exports.FinallyEntry = FinallyEntry;
function LabeledEntry(breakLoc, label) {
Entry.call(this); const t = getTypes(); t.assertLiteral(breakLoc); t.assertIdentifier(label); this.breakLoc = breakLoc; this.label = label;
}
inherits(LabeledEntry, Entry); exports.LabeledEntry = LabeledEntry;
function LeapManager(emitter) {
assert.ok(this instanceof LeapManager); assert.ok(emitter instanceof Emitter); this.emitter = emitter; this.entryStack = [new FunctionEntry(emitter.finalLoc)];
}
let LMp = LeapManager.prototype; exports.LeapManager = LeapManager;
LMp.withEntry = function(entry, callback) {
assert.ok(entry instanceof Entry); this.entryStack.push(entry); try { callback.call(this.emitter); } finally { let popped = this.entryStack.pop(); assert.strictEqual(popped, entry); }
};
LMp._findLeapLocation = function(property, label) {
for (let i = this.entryStack.length - 1; i >= 0; --i) { let entry = this.entryStack[i]; let loc = entry[property]; if (loc) { if (label) { if (entry.label && entry.label.name === label.name) { return loc; } } else if (entry instanceof LabeledEntry) { // Ignore LabeledEntry entries unless we are actually breaking to // a label. } else { return loc; } } } return null;
};
LMp.getBreakLoc = function(label) {
return this._findLeapLocation("breakLoc", label);
};
LMp.getContinueLoc = function(label) {
return this._findLeapLocation("continueLoc", label);
};