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.
7 var callSiteCache = new $Map;
9 function SameCallSiteElements(rawStrings, other) {
10 var length = rawStrings.length;
11 var other = other.raw;
13 if (length !== other.length) return false;
15 for (var i = 0; i < length; ++i) {
16 if (rawStrings[i] !== other[i]) return false;
23 function GetCachedCallSite(siteObj, hash) {
24 var obj = %MapGet(callSiteCache, hash);
26 if (IS_UNDEFINED(obj)) return;
28 var length = obj.length;
29 for (var i = 0; i < length; ++i) {
30 if (SameCallSiteElements(siteObj, obj[i])) return obj[i];
35 function SetCachedCallSite(siteObj, hash) {
36 var obj = %MapGet(callSiteCache, hash);
39 if (IS_UNDEFINED(obj)) {
40 array = new InternalArray(1);
42 %MapSet(callSiteCache, hash, array);
51 function GetTemplateCallSite(siteObj, rawStrings, hash) {
52 var cached = GetCachedCallSite(rawStrings, hash);
54 if (!IS_UNDEFINED(cached)) return cached;
56 %AddNamedProperty(siteObj, "raw", %ObjectFreeze(rawStrings),
57 READ_ONLY | DONT_ENUM | DONT_DELETE);
59 return SetCachedCallSite(%ObjectFreeze(siteObj), hash);
63 // ES6 Draft 10-14-2014, section 21.1.2.4
64 function StringRaw(callSite) {
65 // TODO(caitp): Use rest parameters when implemented
66 var numberOfSubstitutions = %_ArgumentsLength();
67 var cooked = ToObject(callSite);
68 var raw = ToObject(cooked.raw);
69 var literalSegments = ToLength(raw.length);
70 if (literalSegments <= 0) return "";
72 var result = ToString(raw[0]);
74 for (var i = 1; i < literalSegments; ++i) {
75 if (i < numberOfSubstitutions) {
76 result += ToString(%_Arguments(i));
78 result += ToString(raw[i]);
85 function ExtendStringForTemplates() {
86 %CheckIsBootstrapping();
88 // Set up the non-enumerable functions on the String object.
89 InstallFunctions($String, DONT_ENUM, $Array(
94 ExtendStringForTemplates();