Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1 | // Copyright 2014 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | // Called from a desugaring in the parser. |
| 6 | |
| 7 | (function(global, utils) { |
| 8 | |
| 9 | "use strict"; |
| 10 | |
| 11 | %CheckIsBootstrapping(); |
| 12 | |
| 13 | // ------------------------------------------------------------------- |
| 14 | // Imports |
| 15 | |
| 16 | var GlobalMap = global.Map; |
| 17 | var InternalArray = utils.InternalArray; |
| 18 | |
| 19 | // ------------------------------------------------------------------- |
| 20 | |
| 21 | var callSiteCache = new GlobalMap; |
| 22 | var mapGetFn = GlobalMap.prototype.get; |
| 23 | var mapSetFn = GlobalMap.prototype.set; |
| 24 | |
| 25 | |
| 26 | function SameCallSiteElements(rawStrings, other) { |
| 27 | var length = rawStrings.length; |
| 28 | var other = other.raw; |
| 29 | |
| 30 | if (length !== other.length) return false; |
| 31 | |
| 32 | for (var i = 0; i < length; ++i) { |
| 33 | if (rawStrings[i] !== other[i]) return false; |
| 34 | } |
| 35 | |
| 36 | return true; |
| 37 | } |
| 38 | |
| 39 | |
| 40 | function GetCachedCallSite(siteObj, hash) { |
| 41 | var obj = %_Call(mapGetFn, callSiteCache, hash); |
| 42 | |
| 43 | if (IS_UNDEFINED(obj)) return; |
| 44 | |
| 45 | var length = obj.length; |
| 46 | for (var i = 0; i < length; ++i) { |
| 47 | if (SameCallSiteElements(siteObj, obj[i])) return obj[i]; |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | |
| 52 | function SetCachedCallSite(siteObj, hash) { |
| 53 | var obj = %_Call(mapGetFn, callSiteCache, hash); |
| 54 | var array; |
| 55 | |
| 56 | if (IS_UNDEFINED(obj)) { |
| 57 | array = new InternalArray(1); |
| 58 | array[0] = siteObj; |
| 59 | %_Call(mapSetFn, callSiteCache, hash, array); |
| 60 | } else { |
| 61 | obj.push(siteObj); |
| 62 | } |
| 63 | |
| 64 | return siteObj; |
| 65 | } |
| 66 | |
| 67 | |
| 68 | function GetTemplateCallSite(siteObj, rawStrings, hash) { |
| 69 | var cached = GetCachedCallSite(rawStrings, hash); |
| 70 | |
| 71 | if (!IS_UNDEFINED(cached)) return cached; |
| 72 | |
| 73 | %AddNamedProperty(siteObj, "raw", %object_freeze(rawStrings), |
| 74 | READ_ONLY | DONT_ENUM | DONT_DELETE); |
| 75 | |
| 76 | return SetCachedCallSite(%object_freeze(siteObj), hash); |
| 77 | } |
| 78 | |
| 79 | // ---------------------------------------------------------------------------- |
| 80 | // Exports |
| 81 | |
| 82 | %InstallToContext(["get_template_call_site", GetTemplateCallSite]); |
| 83 | |
| 84 | }) |