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diff --git a/js/src/builtin/RegExp.js b/js/src/builtin/RegExp.js
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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/. */
+
+// ECMAScript 2020 draft (2020/03/12) 21.2.5.4 get RegExp.prototype.flags
+// https://tc39.es/ecma262/#sec-get-regexp.prototype.flags
+// Uncloned functions with `$` prefix are allocated as extended function
+// to store the original name in `_SetCanonicalName`.
+function $RegExpFlagsGetter() {
+ // Steps 1-2.
+ var R = this;
+ if (!IsObject(R))
+ ThrowTypeError(JSMSG_OBJECT_REQUIRED, R === null ? "null" : typeof R);
+
+ // Step 3.
+ var result = "";
+
+ // Steps 4-5.
+ if (R.global)
+ result += "g";
+
+ // Steps 6-7.
+ if (R.ignoreCase)
+ result += "i";
+
+ // Steps 8-9.
+ if (R.multiline)
+ result += "m";
+
+ // Steps 10-11.
+ if (R.dotAll)
+ result += "s";
+
+ // Steps 12-13.
+ if (R.unicode)
+ result += "u";
+
+ // Steps 14-15.
+ if (R.sticky)
+ result += "y";
+
+ // Step 16.
+ return result;
+}
+_SetCanonicalName($RegExpFlagsGetter, "get flags");
+
+// ES 2017 draft 40edb3a95a475c1b251141ac681b8793129d9a6d 21.2.5.14.
+function $RegExpToString()
+{
+ // Step 1.
+ var R = this;
+
+ // Step 2.
+ if (!IsObject(R))
+ ThrowTypeError(JSMSG_OBJECT_REQUIRED, R === null ? "null" : typeof R);
+
+ // Step 3.
+ var pattern = ToString(R.source);
+
+ // Step 4.
+ var flags = ToString(R.flags);
+
+ // Steps 5-6.
+ return "/" + pattern + "/" + flags;
+}
+_SetCanonicalName($RegExpToString, "toString");
+
+// ES 2016 draft Mar 25, 2016 21.2.5.2.3.
+function AdvanceStringIndex(S, index) {
+ // Step 1.
+ assert(typeof S === "string", "Expected string as 1st argument");
+
+ // Step 2.
+ assert(index >= 0 && index <= MAX_NUMERIC_INDEX, "Expected integer as 2nd argument");
+
+ // Step 3 (skipped).
+
+ // Step 4 (skipped).
+
+ // Step 5.
+ var length = S.length;
+
+ // Step 6.
+ if (index + 1 >= length)
+ return index + 1;
+
+ // Step 7.
+ var first = callFunction(std_String_charCodeAt, S, index);
+
+ // Step 8.
+ if (first < 0xD800 || first > 0xDBFF)
+ return index + 1;
+
+ // Step 9.
+ var second = callFunction(std_String_charCodeAt, S, index + 1);
+
+ // Step 10.
+ if (second < 0xDC00 || second > 0xDFFF)
+ return index + 1;
+
+ // Step 11.
+ return index + 2;
+}
+
+// ES 2017 draft rev 6859bb9ccaea9c6ede81d71e5320e3833b92cb3e 21.2.5.6.
+function RegExpMatch(string) {
+ // Step 1.
+ var rx = this;
+
+ // Step 2.
+ if (!IsObject(rx))
+ ThrowTypeError(JSMSG_OBJECT_REQUIRED, rx === null ? "null" : typeof rx);
+
+ // Step 3.
+ var S = ToString(string);
+
+ // Optimized paths for simple cases.
+ if (IsRegExpMethodOptimizable(rx)) {
+ // Step 4.
+ var flags = UnsafeGetInt32FromReservedSlot(rx, REGEXP_FLAGS_SLOT);
+ var global = !!(flags & REGEXP_GLOBAL_FLAG);
+
+ if (global) {
+ // Step 6.a.
+ var fullUnicode = !!(flags & REGEXP_UNICODE_FLAG);
+
+ // Steps 6.b-e.
+ return RegExpGlobalMatchOpt(rx, S, fullUnicode);
+ }
+
+ // Step 5.
+ return RegExpBuiltinExec(rx, S, false);
+ }
+
+ // Stes 4-6
+ return RegExpMatchSlowPath(rx, S);
+}
+
+// ES 2017 draft rev 6859bb9ccaea9c6ede81d71e5320e3833b92cb3e 21.2.5.6
+// steps 4-6.
+function RegExpMatchSlowPath(rx, S) {
+ // Steps 4-5.
+ if (!rx.global)
+ return RegExpExec(rx, S, false);
+
+ // Step 6.a.
+ var fullUnicode = !!rx.unicode;
+
+ // Step 6.b.
+ rx.lastIndex = 0;
+
+ // Step 6.c.
+ var A = [];
+
+ // Step 6.d.
+ var n = 0;
+
+ // Step 6.e.
+ while (true) {
+ // Step 6.e.i.
+ var result = RegExpExec(rx, S, false);
+
+ // Step 6.e.ii.
+ if (result === null)
+ return (n === 0) ? null : A;
+
+ // Step 6.e.iii.1.
+ var matchStr = ToString(result[0]);
+
+ // Step 6.e.iii.2.
+ _DefineDataProperty(A, n, matchStr);
+
+ // Step 6.e.iii.4.
+ if (matchStr === "") {
+ var lastIndex = ToLength(rx.lastIndex);
+ rx.lastIndex = fullUnicode ? AdvanceStringIndex(S, lastIndex) : lastIndex + 1;
+ }
+
+ // Step 6.e.iii.5.
+ n++;
+ }
+}
+
+// ES 2017 draft rev 6859bb9ccaea9c6ede81d71e5320e3833b92cb3e 21.2.5.6.
+// Steps 6.b-e.
+// Optimized path for @@match with global flag.
+function RegExpGlobalMatchOpt(rx, S, fullUnicode) {
+ // Step 6.b.
+ var lastIndex = 0;
+ rx.lastIndex = 0;
+
+ // Step 6.c.
+ var A = [];
+
+ // Step 6.d.
+ var n = 0;
+
+ var lengthS = S.length;
+
+ // Step 6.e.
+ while (true) {
+ // Step 6.e.i.
+ var result = RegExpMatcher(rx, S, lastIndex);
+
+ // Step 6.e.ii.
+ if (result === null)
+ return (n === 0) ? null : A;
+
+ lastIndex = result.index + result[0].length;
+
+ // Step 6.e.iii.1.
+ var matchStr = result[0];
+
+ // Step 6.e.iii.2.
+ _DefineDataProperty(A, n, matchStr);
+
+ // Step 6.e.iii.4.
+ if (matchStr === "") {
+ lastIndex = fullUnicode ? AdvanceStringIndex(S, lastIndex) : lastIndex + 1;
+ if (lastIndex > lengthS)
+ return A;
+ }
+
+ // Step 6.e.iii.5.
+ n++;
+ }
+}
+
+// Checks if following properties and getters are not modified, and accessing
+// them not observed by content script:
+// * flags
+// * global
+// * ignoreCase
+// * multiline
+// * dotAll
+// * sticky
+// * unicode
+// * exec
+// * lastIndex
+function IsRegExpMethodOptimizable(rx) {
+ if (!IsRegExpObject(rx))
+ return false;
+
+ var RegExpProto = GetBuiltinPrototype("RegExp");
+ // If RegExpPrototypeOptimizable and RegExpInstanceOptimizable succeed,
+ // `RegExpProto.exec` is guaranteed to be data properties.
+ return RegExpPrototypeOptimizable(RegExpProto) &&
+ RegExpInstanceOptimizable(rx, RegExpProto) &&
+ RegExpProto.exec === RegExp_prototype_Exec;
+}
+
+// ES 2017 draft rev 03bfda119d060aca4099d2b77cf43f6d4f11cfa2 21.2.5.8.
+function RegExpReplace(string, replaceValue) {
+ // Step 1.
+ var rx = this;
+
+ // Step 2.
+ if (!IsObject(rx))
+ ThrowTypeError(JSMSG_OBJECT_REQUIRED, rx === null ? "null" : typeof rx);
+
+ // Step 3.
+ var S = ToString(string);
+
+ // Step 4.
+ var lengthS = S.length;
+
+ // Step 5.
+ var functionalReplace = IsCallable(replaceValue);
+
+ // Step 6.
+ var firstDollarIndex = -1;
+ if (!functionalReplace) {
+ // Step 6.a.
+ replaceValue = ToString(replaceValue);
+
+ // Skip if replaceValue is an empty string or a single character.
+ // A single character string may contain "$", but that cannot be a
+ // substitution.
+ if (replaceValue.length > 1)
+ firstDollarIndex = GetFirstDollarIndex(replaceValue);
+ }
+
+ // Optimized paths.
+ if (IsRegExpMethodOptimizable(rx)) {
+ var flags = UnsafeGetInt32FromReservedSlot(rx, REGEXP_FLAGS_SLOT);
+
+ // Step 7.
+ var global = !!(flags & REGEXP_GLOBAL_FLAG);
+
+ // Steps 8-16.
+ if (global) {
+ if (functionalReplace) {
+ // For large strings check if the replacer function is
+ // applicable for the elem-base optimization.
+ if (lengthS > 5000) {
+ var elemBase = GetElemBaseForLambda(replaceValue);
+ if (IsObject(elemBase)) {
+ return RegExpGlobalReplaceOptElemBase(rx, S, lengthS, replaceValue, flags,
+ elemBase);
+ }
+ }
+ return RegExpGlobalReplaceOptFunc(rx, S, lengthS, replaceValue, flags);
+ }
+ if (firstDollarIndex !== -1) {
+ return RegExpGlobalReplaceOptSubst(rx, S, lengthS, replaceValue, flags,
+ firstDollarIndex);
+ }
+ if (lengthS < 0x7fff)
+ return RegExpGlobalReplaceShortOpt(rx, S, lengthS, replaceValue, flags);
+ return RegExpGlobalReplaceOpt(rx, S, lengthS, replaceValue, flags);
+ }
+
+ if (functionalReplace)
+ return RegExpLocalReplaceOptFunc(rx, S, lengthS, replaceValue);
+ if (firstDollarIndex !== -1)
+ return RegExpLocalReplaceOptSubst(rx, S, lengthS, replaceValue, firstDollarIndex);
+ if (lengthS < 0x7fff)
+ return RegExpLocalReplaceOptShort(rx, S, lengthS, replaceValue);
+ return RegExpLocalReplaceOpt(rx, S, lengthS, replaceValue);
+ }
+
+ // Steps 8-16.
+ return RegExpReplaceSlowPath(rx, S, lengthS, replaceValue,
+ functionalReplace, firstDollarIndex);
+}
+
+// ES 2017 draft rev 03bfda119d060aca4099d2b77cf43f6d4f11cfa2 21.2.5.8
+// steps 7-16.
+// Slow path for @@replace.
+function RegExpReplaceSlowPath(rx, S, lengthS, replaceValue,
+ functionalReplace, firstDollarIndex)
+{
+ // Step 7.
+ var global = !!rx.global;
+
+ // Step 8.
+ var fullUnicode = false;
+ if (global) {
+ // Step 8.a.
+ fullUnicode = !!rx.unicode;
+
+ // Step 8.b.
+ rx.lastIndex = 0;
+ }
+
+ // Step 9.
+ var results = [];
+ var nResults = 0;
+
+ // Step 11.
+ while (true) {
+ // Step 11.a.
+ var result = RegExpExec(rx, S, false);
+
+ // Step 11.b.
+ if (result === null)
+ break;
+
+ // Step 11.c.i.
+ _DefineDataProperty(results, nResults++, result);
+
+ // Step 11.c.ii.
+ if (!global)
+ break;
+
+ // Step 11.c.iii.1.
+ var matchStr = ToString(result[0]);
+
+ // Step 11.c.iii.2.
+ if (matchStr === "") {
+ var lastIndex = ToLength(rx.lastIndex);
+ rx.lastIndex = fullUnicode ? AdvanceStringIndex(S, lastIndex) : lastIndex + 1;
+ }
+ }
+
+ // Step 12.
+ var accumulatedResult = "";
+
+ // Step 13.
+ var nextSourcePosition = 0;
+
+ // Step 14.
+ for (var i = 0; i < nResults; i++) {
+ result = results[i];
+
+ // Steps 14.a-b.
+ var nCaptures = std_Math_max(ToLength(result.length) - 1, 0);
+
+ // Step 14.c.
+ var matched = ToString(result[0]);
+
+ // Step 14.d.
+ var matchLength = matched.length;
+
+ // Steps 14.e-f.
+ var position = std_Math_max(std_Math_min(ToInteger(result.index), lengthS), 0);
+
+ var n, capN, replacement;
+ if (functionalReplace || firstDollarIndex !== -1) {
+ // Steps 14.g-k.
+ replacement = RegExpGetComplexReplacement(result, matched, S, position,
+ nCaptures, replaceValue,
+ functionalReplace, firstDollarIndex);
+ } else {
+ // Step 14.g, 14.i, 14.i.iv.
+ // We don't need captures array, but ToString is visible to script.
+ for (n = 1; n <= nCaptures; n++) {
+ // Step 14.i.i-ii.
+ capN = result[n];
+
+ // Step 14.i.ii.
+ if (capN !== undefined)
+ ToString(capN);
+ }
+ // Step 14.j, 14.l., GetSubstitution Step 11.
+ // We don't need namedCaptures, but ToObject is visible to script.
+ var namedCaptures = result.groups;
+ if (namedCaptures !== undefined)
+ ToObject(namedCaptures);
+
+ replacement = replaceValue;
+ }
+
+ // Step 14.m.
+ if (position >= nextSourcePosition) {
+ // Step 14.m.ii.
+ accumulatedResult += Substring(S, nextSourcePosition,
+ position - nextSourcePosition) + replacement;
+
+ // Step 14.m.iii.
+ nextSourcePosition = position + matchLength;
+ }
+ }
+
+ // Step 15.
+ if (nextSourcePosition >= lengthS)
+ return accumulatedResult;
+
+ // Step 16.
+ return accumulatedResult + Substring(S, nextSourcePosition, lengthS - nextSourcePosition);
+}
+
+// ES 2021 draft 21.2.5.10
+// https://tc39.es/ecma262/#sec-regexp.prototype-@@replace
+// steps 14.g-l.
+// Calculates functional/substitution replacement from match result.
+// Used in the following functions:
+// * RegExpReplaceSlowPath
+function RegExpGetComplexReplacement(result, matched, S, position,
+ nCaptures, replaceValue,
+ functionalReplace, firstDollarIndex)
+{
+ // Step 14.h.
+ var captures = [];
+ var capturesLength = 0;
+
+ // Step 14.k.i (reordered).
+ _DefineDataProperty(captures, capturesLength++, matched);
+
+ // Step 14.g, 14.i, 14.i.iv.
+ for (var n = 1; n <= nCaptures; n++) {
+ // Step 14.i.i.
+ var capN = result[n];
+
+ // Step 14.i.ii.
+ if (capN !== undefined)
+ capN = ToString(capN);
+
+ // Step 14.i.iii.
+ _DefineDataProperty(captures, capturesLength++, capN);
+ }
+
+ // Step 14.j.
+ var namedCaptures = result.groups;
+
+ // Step 14.k.
+ if (functionalReplace) {
+ // For `nCaptures` <= 4 case, call `replaceValue` directly, otherwise
+ // use `std_Function_apply` with all arguments stored in `captures`.
+ if (namedCaptures === undefined) {
+ switch (nCaptures) {
+ case 0:
+ return ToString(replaceValue(SPREAD(captures, 1), position, S));
+ case 1:
+ return ToString(replaceValue(SPREAD(captures, 2), position, S));
+ case 2:
+ return ToString(replaceValue(SPREAD(captures, 3), position, S));
+ case 3:
+ return ToString(replaceValue(SPREAD(captures, 4), position, S));
+ case 4:
+ return ToString(replaceValue(SPREAD(captures, 5), position, S));
+ }
+ }
+ // Steps 14.k.ii-v.
+ _DefineDataProperty(captures, capturesLength++, position);
+ _DefineDataProperty(captures, capturesLength++, S);
+ if (namedCaptures !== undefined) {
+ _DefineDataProperty(captures, capturesLength++, namedCaptures);
+ }
+ return ToString(callFunction(std_Function_apply, replaceValue, undefined, captures));
+ }
+
+ // Step 14.l.
+ if (namedCaptures !== undefined) {
+ namedCaptures = ToObject(namedCaptures);
+ }
+ return RegExpGetSubstitution(captures, S, position, replaceValue, firstDollarIndex,
+ namedCaptures);
+}
+
+// ES 2021 draft 21.2.5.10
+// https://tc39.es/ecma262/#sec-regexp.prototype-@@replace
+// steps 14.g-k.
+// Calculates functional replacement from match result.
+// Used in the following functions:
+// * RegExpGlobalReplaceOptFunc
+// * RegExpGlobalReplaceOptElemBase
+// * RegExpLocalReplaceOptFunc
+function RegExpGetFunctionalReplacement(result, S, position, replaceValue) {
+ // For `nCaptures` <= 4 case, call `replaceValue` directly, otherwise
+ // use `std_Function_apply` with all arguments stored in `captures`.
+ assert(result.length >= 1, "RegExpMatcher doesn't return an empty array");
+ var nCaptures = result.length - 1;
+
+ // Step 14.j (reordered)
+ var namedCaptures = result.groups;
+
+ if (namedCaptures === undefined) {
+ switch (nCaptures) {
+ case 0:
+ return ToString(replaceValue(SPREAD(result, 1), position, S));
+ case 1:
+ return ToString(replaceValue(SPREAD(result, 2), position, S));
+ case 2:
+ return ToString(replaceValue(SPREAD(result, 3), position, S));
+ case 3:
+ return ToString(replaceValue(SPREAD(result, 4), position, S));
+ case 4:
+ return ToString(replaceValue(SPREAD(result, 5), position, S));
+ }
+ }
+
+ // Steps 14.g-i, 14.k.i-ii.
+ var captures = [];
+ for (var n = 0; n <= nCaptures; n++) {
+ assert(typeof result[n] === "string" || result[n] === undefined,
+ "RegExpMatcher returns only strings and undefined");
+ _DefineDataProperty(captures, n, result[n]);
+ }
+
+ // Step 14.k.iii.
+ _DefineDataProperty(captures, nCaptures + 1, position);
+ _DefineDataProperty(captures, nCaptures + 2, S);
+
+ // Step 14.k.iv.
+ if (namedCaptures !== undefined) {
+ _DefineDataProperty(captures, nCaptures + 3, namedCaptures);
+ }
+
+ // Steps 14.k.v-vi.
+ return ToString(callFunction(std_Function_apply, replaceValue, undefined, captures));
+}
+
+// ES 2017 draft rev 03bfda119d060aca4099d2b77cf43f6d4f11cfa2 21.2.5.8
+// steps 8.b-16.
+// Optimized path for @@replace with the following conditions:
+// * global flag is true
+// * S is a short string (lengthS < 0x7fff)
+// * replaceValue is a string without "$"
+function RegExpGlobalReplaceShortOpt(rx, S, lengthS, replaceValue, flags)
+{
+ // Step 8.a.
+ var fullUnicode = !!(flags & REGEXP_UNICODE_FLAG);
+
+ // Step 8.b.
+ var lastIndex = 0;
+ rx.lastIndex = 0;
+
+ // Step 12 (reordered).
+ var accumulatedResult = "";
+
+ // Step 13 (reordered).
+ var nextSourcePosition = 0;
+
+ // Step 11.
+ while (true) {
+ // Step 11.a.
+ var result = RegExpSearcher(rx, S, lastIndex);
+
+ // Step 11.b.
+ if (result === -1)
+ break;
+
+ var position = result & 0x7fff;
+ lastIndex = (result >> 15) & 0x7fff;
+
+ // Step 14.l.ii.
+ accumulatedResult += Substring(S, nextSourcePosition,
+ position - nextSourcePosition) + replaceValue;
+
+ // Step 14.l.iii.
+ nextSourcePosition = lastIndex;
+
+ // Step 11.c.iii.2.
+ if (lastIndex === position) {
+ lastIndex = fullUnicode ? AdvanceStringIndex(S, lastIndex) : lastIndex + 1;
+ if (lastIndex > lengthS)
+ break;
+ }
+ }
+
+ // Step 15.
+ if (nextSourcePosition >= lengthS)
+ return accumulatedResult;
+
+ // Step 16.
+ return accumulatedResult + Substring(S, nextSourcePosition, lengthS - nextSourcePosition);
+}
+
+// ES 2017 draft rev 03bfda119d060aca4099d2b77cf43f6d4f11cfa2 21.2.5.8
+// steps 8-16.
+// Optimized path for @@replace.
+
+// Conditions:
+// * global flag is true
+// * replaceValue is a string without "$"
+#define FUNC_NAME RegExpGlobalReplaceOpt
+#include "RegExpGlobalReplaceOpt.h.js"
+#undef FUNC_NAME
+
+// Conditions:
+// * global flag is true
+// * replaceValue is a function
+#define FUNC_NAME RegExpGlobalReplaceOptFunc
+#define FUNCTIONAL
+#include "RegExpGlobalReplaceOpt.h.js"
+#undef FUNCTIONAL
+#undef FUNC_NAME
+
+// Conditions:
+// * global flag is true
+// * replaceValue is a function that returns element of an object
+#define FUNC_NAME RegExpGlobalReplaceOptElemBase
+#define ELEMBASE
+#include "RegExpGlobalReplaceOpt.h.js"
+#undef ELEMBASE
+#undef FUNC_NAME
+
+// Conditions:
+// * global flag is true
+// * replaceValue is a string with "$"
+#define FUNC_NAME RegExpGlobalReplaceOptSubst
+#define SUBSTITUTION
+#include "RegExpGlobalReplaceOpt.h.js"
+#undef SUBSTITUTION
+#undef FUNC_NAME
+
+// Conditions:
+// * global flag is false
+// * replaceValue is a string without "$"
+#define FUNC_NAME RegExpLocalReplaceOpt
+#include "RegExpLocalReplaceOpt.h.js"
+#undef FUNC_NAME
+
+// Conditions:
+// * global flag is false
+// * S is a short string (lengthS < 0x7fff)
+// * replaceValue is a string without "$"
+#define FUNC_NAME RegExpLocalReplaceOptShort
+#define SHORT_STRING
+#include "RegExpLocalReplaceOpt.h.js"
+#undef SHORT_STRING
+#undef FUNC_NAME
+
+// Conditions:
+// * global flag is false
+// * replaceValue is a function
+#define FUNC_NAME RegExpLocalReplaceOptFunc
+#define FUNCTIONAL
+#include "RegExpLocalReplaceOpt.h.js"
+#undef FUNCTIONAL
+#undef FUNC_NAME
+
+// Conditions:
+// * global flag is false
+// * replaceValue is a string with "$"
+#define FUNC_NAME RegExpLocalReplaceOptSubst
+#define SUBSTITUTION
+#include "RegExpLocalReplaceOpt.h.js"
+#undef SUBSTITUTION
+#undef FUNC_NAME
+
+// ES2017 draft rev 6390c2f1b34b309895d31d8c0512eac8660a0210
+// 21.2.5.9 RegExp.prototype [ @@search ] ( string )
+function RegExpSearch(string) {
+ // Step 1.
+ var rx = this;
+
+ // Step 2.
+ if (!IsObject(rx))
+ ThrowTypeError(JSMSG_OBJECT_REQUIRED, rx === null ? "null" : typeof rx);
+
+ // Step 3.
+ var S = ToString(string);
+
+ // Step 4.
+ var previousLastIndex = rx.lastIndex;
+
+ // Step 5.
+ var lastIndexIsZero = SameValue(previousLastIndex, 0);
+ if (!lastIndexIsZero)
+ rx.lastIndex = 0;
+
+ if (IsRegExpMethodOptimizable(rx) && S.length < 0x7fff) {
+ // Step 6.
+ var result = RegExpSearcher(rx, S, 0);
+
+ // We need to consider two cases:
+ //
+ // 1. Neither global nor sticky is set:
+ // RegExpBuiltinExec doesn't modify lastIndex for local RegExps, that
+ // means |SameValue(rx.lastIndex, 0)| is true after calling exec. The
+ // comparison in steps 7-8 |SameValue(rx.lastIndex, previousLastIndex)|
+ // is therefore equal to the already computed |lastIndexIsZero| value.
+ //
+ // 2. Global or sticky flag is set.
+ // RegExpBuiltinExec will always update lastIndex and we need to
+ // restore the property to its original value.
+
+ // Steps 7-8.
+ if (!lastIndexIsZero) {
+ rx.lastIndex = previousLastIndex;
+ } else {
+ var flags = UnsafeGetInt32FromReservedSlot(rx, REGEXP_FLAGS_SLOT);
+ if (flags & (REGEXP_GLOBAL_FLAG | REGEXP_STICKY_FLAG))
+ rx.lastIndex = previousLastIndex;
+ }
+
+ // Step 9.
+ if (result === -1)
+ return -1;
+
+ // Step 10.
+ return result & 0x7fff;
+ }
+
+ return RegExpSearchSlowPath(rx, S, previousLastIndex);
+}
+
+// ES2017 draft rev 6390c2f1b34b309895d31d8c0512eac8660a0210
+// 21.2.5.9 RegExp.prototype [ @@search ] ( string )
+// Steps 6-10.
+function RegExpSearchSlowPath(rx, S, previousLastIndex) {
+ // Step 6.
+ var result = RegExpExec(rx, S, false);
+
+ // Step 7.
+ var currentLastIndex = rx.lastIndex;
+
+ // Step 8.
+ if (!SameValue(currentLastIndex, previousLastIndex))
+ rx.lastIndex = previousLastIndex;
+
+ // Step 9.
+ if (result === null)
+ return -1;
+
+ // Step 10.
+ return result.index;
+}
+
+function IsRegExpSplitOptimizable(rx, C) {
+ if (!IsRegExpObject(rx))
+ return false;
+
+ var RegExpCtor = GetBuiltinConstructor("RegExp");
+ if (C !== RegExpCtor)
+ return false;
+
+ var RegExpProto = RegExpCtor.prototype;
+ // If RegExpPrototypeOptimizable succeeds, `RegExpProto.exec` is guaranteed
+ // to be a data property.
+ return RegExpPrototypeOptimizable(RegExpProto) &&
+ RegExpInstanceOptimizable(rx, RegExpProto) &&
+ RegExpProto.exec === RegExp_prototype_Exec;
+}
+
+// ES 2017 draft 6859bb9ccaea9c6ede81d71e5320e3833b92cb3e 21.2.5.11.
+function RegExpSplit(string, limit) {
+ // Step 1.
+ var rx = this;
+
+ // Step 2.
+ if (!IsObject(rx))
+ ThrowTypeError(JSMSG_OBJECT_REQUIRED, rx === null ? "null" : typeof rx);
+
+ // Step 3.
+ var S = ToString(string);
+
+ // Step 4.
+ var C = SpeciesConstructor(rx, GetBuiltinConstructor("RegExp"));
+
+ var optimizable = IsRegExpSplitOptimizable(rx, C) &&
+ (limit === undefined || typeof limit == "number");
+
+ var flags, unicodeMatching, splitter;
+ if (optimizable) {
+ // Step 5.
+ flags = UnsafeGetInt32FromReservedSlot(rx, REGEXP_FLAGS_SLOT);
+
+ // Steps 6-7.
+ unicodeMatching = !!(flags & (REGEXP_UNICODE_FLAG));
+
+ // Steps 8-10.
+ // If split operation is optimizable, perform non-sticky match.
+ if (flags & REGEXP_STICKY_FLAG) {
+ var source = UnsafeGetStringFromReservedSlot(rx, REGEXP_SOURCE_SLOT);
+ splitter = regexp_construct_raw_flags(source, flags & ~REGEXP_STICKY_FLAG);
+ } else {
+ splitter = rx;
+ }
+ } else {
+ // Step 5.
+ flags = ToString(rx.flags);
+
+ // Steps 6-7.
+ unicodeMatching = callFunction(std_String_includes, flags, "u");
+
+ // Steps 8-9.
+ var newFlags;
+ if (callFunction(std_String_includes, flags, "y"))
+ newFlags = flags;
+ else
+ newFlags = flags + "y";
+
+ // Step 10.
+ splitter = new C(rx, newFlags);
+ }
+
+ // Step 11.
+ var A = [];
+
+ // Step 12.
+ var lengthA = 0;
+
+ // Step 13.
+ var lim;
+ if (limit === undefined)
+ lim = MAX_UINT32;
+ else
+ lim = limit >>> 0;
+
+ // Step 15.
+ var p = 0;
+
+ // Step 16.
+ if (lim === 0)
+ return A;
+
+ // Step 14 (reordered).
+ var size = S.length;
+
+ // Step 17.
+ if (size === 0) {
+ // Step 17.a.
+ var z;
+ if (optimizable)
+ z = RegExpMatcher(splitter, S, 0);
+ else
+ z = RegExpExec(splitter, S, false);
+
+ // Step 17.b.
+ if (z !== null)
+ return A;
+
+ // Step 17.d.
+ _DefineDataProperty(A, 0, S);
+
+ // Step 17.e.
+ return A;
+ }
+
+ // Step 18.
+ var q = p;
+
+ // Step 19.
+ while (q < size) {
+ var e;
+ if (optimizable) {
+ // Step 19.a (skipped).
+ // splitter.lastIndex is not used.
+
+ // Step 19.b.
+ z = RegExpMatcher(splitter, S, q);
+
+ // Step 19.c.
+ if (z === null)
+ break;
+
+ // splitter.lastIndex is not updated.
+ q = z.index;
+ if (q >= size)
+ break;
+
+ // Step 19.d.i.
+ e = q + z[0].length;
+ } else {
+ // Step 19.a.
+ splitter.lastIndex = q;
+
+ // Step 19.b.
+ z = RegExpExec(splitter, S, false);
+
+ // Step 19.c.
+ if (z === null) {
+ q = unicodeMatching ? AdvanceStringIndex(S, q) : q + 1;
+ continue;
+ }
+
+ // Step 19.d.i.
+ e = ToLength(splitter.lastIndex);
+ }
+
+ // Step 19.d.iii.
+ if (e === p) {
+ q = unicodeMatching ? AdvanceStringIndex(S, q) : q + 1;
+ continue;
+ }
+
+ // Steps 19.d.iv.1-3.
+ _DefineDataProperty(A, lengthA, Substring(S, p, q - p));
+
+ // Step 19.d.iv.4.
+ lengthA++;
+
+ // Step 19.d.iv.5.
+ if (lengthA === lim)
+ return A;
+
+ // Step 19.d.iv.6.
+ p = e;
+
+ // Steps 19.d.iv.7-8.
+ var numberOfCaptures = std_Math_max(ToLength(z.length) - 1, 0);
+
+ // Step 19.d.iv.9.
+ var i = 1;
+
+ // Step 19.d.iv.10.
+ while (i <= numberOfCaptures) {
+ // Steps 19.d.iv.10.a-b.
+ _DefineDataProperty(A, lengthA, z[i]);
+
+ // Step 19.d.iv.10.c.
+ i++;
+
+ // Step 19.d.iv.10.d.
+ lengthA++;
+
+ // Step 19.d.iv.10.e.
+ if (lengthA === lim)
+ return A;
+ }
+
+ // Step 19.d.iv.11.
+ q = p;
+ }
+
+ // Steps 20-22.
+ if (p >= size)
+ _DefineDataProperty(A, lengthA, "");
+ else
+ _DefineDataProperty(A, lengthA, Substring(S, p, size - p));
+
+ // Step 23.
+ return A;
+}
+
+// ES6 21.2.5.2.
+// NOTE: This is not RegExpExec (21.2.5.2.1).
+function RegExp_prototype_Exec(string) {
+ // Steps 1-3.
+ var R = this;
+ if (!IsObject(R) || !IsRegExpObject(R))
+ return callFunction(CallRegExpMethodIfWrapped, R, string, "RegExp_prototype_Exec");
+
+ // Steps 4-5.
+ var S = ToString(string);
+
+ // Step 6.
+ return RegExpBuiltinExec(R, S, false);
+}
+
+// ES6 21.2.5.2.1.
+function RegExpExec(R, S, forTest) {
+ // Steps 1-2 (skipped).
+
+ // Steps 3-4.
+ var exec = R.exec;
+
+ // Step 5.
+ // If exec is the original RegExp.prototype.exec, use the same, faster,
+ // path as for the case where exec isn't callable.
+ if (exec === RegExp_prototype_Exec || !IsCallable(exec)) {
+ // ES6 21.2.5.2 steps 1-2, 4-5 (skipped) for optimized case.
+
+ // Steps 6-7 or ES6 21.2.5.2 steps 3, 6 for optimized case.
+ return RegExpBuiltinExec(R, S, forTest);
+ }
+
+ // Steps 5.a-b.
+ var result = callContentFunction(exec, R, S);
+
+ // Step 5.c.
+ if (result !== null && !IsObject(result))
+ ThrowTypeError(JSMSG_EXEC_NOT_OBJORNULL);
+
+ // Step 5.d.
+ return forTest ? result !== null : result;
+}
+
+// ES2017 draft rev 6390c2f1b34b309895d31d8c0512eac8660a0210
+// 21.2.5.2.2 Runtime Semantics: RegExpBuiltinExec ( R, S )
+function RegExpBuiltinExec(R, S, forTest) {
+ // 21.2.5.2.1 Runtime Semantics: RegExpExec, step 5.
+ // This check is here for RegExpTest. RegExp_prototype_Exec does same
+ // thing already.
+ if (!IsRegExpObject(R))
+ return UnwrapAndCallRegExpBuiltinExec(R, S, forTest);
+
+ // Steps 1-3 (skipped).
+
+ // Step 4.
+ var lastIndex = ToLength(R.lastIndex);
+
+ // Step 5.
+ var flags = UnsafeGetInt32FromReservedSlot(R, REGEXP_FLAGS_SLOT);
+
+ // Steps 6-7.
+ var globalOrSticky = !!(flags & (REGEXP_GLOBAL_FLAG | REGEXP_STICKY_FLAG));
+
+ // Step 8.
+ if (!globalOrSticky) {
+ lastIndex = 0;
+ } else {
+ // Step 12.a.
+ if (lastIndex > S.length) {
+ // Steps 12.a.i-ii.
+ if (globalOrSticky)
+ R.lastIndex = 0;
+ return forTest ? false : null;
+ }
+ }
+
+ if (forTest) {
+ // Steps 3, 9-25, except 12.a.i-ii, 12.c.i.1-2, 15.
+ var endIndex = RegExpTester(R, S, lastIndex);
+ if (endIndex == -1) {
+ // Steps 12.a.i-ii, 12.c.i.1-2.
+ if (globalOrSticky)
+ R.lastIndex = 0;
+ return false;
+ }
+
+ // Step 15.
+ if (globalOrSticky)
+ R.lastIndex = endIndex;
+
+ return true;
+ }
+
+ // Steps 3, 9-25, except 12.a.i-ii, 12.c.i.1-2, 15.
+ var result = RegExpMatcher(R, S, lastIndex);
+ if (result === null) {
+ // Steps 12.a.i, 12.c.i.
+ if (globalOrSticky)
+ R.lastIndex = 0;
+ } else {
+ // Step 15.
+ if (globalOrSticky)
+ R.lastIndex = result.index + result[0].length;
+ }
+
+ return result;
+}
+
+function UnwrapAndCallRegExpBuiltinExec(R, S, forTest) {
+ return callFunction(CallRegExpMethodIfWrapped, R, S, forTest, "CallRegExpBuiltinExec");
+}
+
+function CallRegExpBuiltinExec(S, forTest) {
+ return RegExpBuiltinExec(this, S, forTest);
+}
+
+// ES6 21.2.5.13.
+function RegExpTest(string) {
+ // Steps 1-2.
+ var R = this;
+ if (!IsObject(R))
+ ThrowTypeError(JSMSG_OBJECT_REQUIRED, R === null ? "null" : typeof R);
+
+ // Steps 3-4.
+ var S = ToString(string);
+
+ // Steps 5-6.
+ return RegExpExec(R, S, true);
+}
+
+// ES 2016 draft Mar 25, 2016 21.2.4.2.
+function $RegExpSpecies() {
+ // Step 1.
+ return this;
+}
+_SetCanonicalName($RegExpSpecies, "get [Symbol.species]");
+
+function IsRegExpMatchAllOptimizable(rx, C) {
+ if (!IsRegExpObject(rx))
+ return false;
+
+ var RegExpCtor = GetBuiltinConstructor("RegExp");
+ if (C !== RegExpCtor)
+ return false;
+
+ var RegExpProto = RegExpCtor.prototype;
+ return RegExpPrototypeOptimizable(RegExpProto) &&
+ RegExpInstanceOptimizable(rx, RegExpProto);
+}
+
+// String.prototype.matchAll proposal.
+//
+// RegExp.prototype [ @@matchAll ] ( string )
+function RegExpMatchAll(string) {
+ // Step 1.
+ var rx = this;
+
+ // Step 2.
+ if (!IsObject(rx))
+ ThrowTypeError(JSMSG_OBJECT_REQUIRED, rx === null ? "null" : typeof rx);
+
+ // Step 3.
+ var str = ToString(string);
+
+ // Step 4.
+ var C = SpeciesConstructor(rx, GetBuiltinConstructor("RegExp"));
+
+ var source, flags, matcher, lastIndex;
+ if (IsRegExpMatchAllOptimizable(rx, C)) {
+ // Step 5, 9-12.
+ source = UnsafeGetStringFromReservedSlot(rx, REGEXP_SOURCE_SLOT);
+ flags = UnsafeGetInt32FromReservedSlot(rx, REGEXP_FLAGS_SLOT);
+
+ // Step 6.
+ matcher = rx;
+
+ // Step 7.
+ lastIndex = ToLength(rx.lastIndex);
+
+ // Step 8 (not applicable for the optimized path).
+ } else {
+ // Step 5.
+ source = "";
+ flags = ToString(rx.flags);
+
+ // Step 6.
+ matcher = new C(rx, flags);
+
+ // Steps 7-8.
+ matcher.lastIndex = ToLength(rx.lastIndex);
+
+ // Steps 9-12.
+ flags = (callFunction(std_String_includes, flags, "g") ? REGEXP_GLOBAL_FLAG : 0) |
+ (callFunction(std_String_includes, flags, "u") ? REGEXP_UNICODE_FLAG : 0);
+
+ // Take the non-optimized path.
+ lastIndex = REGEXP_STRING_ITERATOR_LASTINDEX_SLOW;
+ }
+
+ // Step 13.
+ return CreateRegExpStringIterator(matcher, str, source, flags, lastIndex);
+}
+
+// String.prototype.matchAll proposal.
+//
+// CreateRegExpStringIterator ( R, S, global, fullUnicode )
+function CreateRegExpStringIterator(regexp, string, source, flags, lastIndex) {
+ // Step 1.
+ assert(typeof string === "string", "|string| is a string value");
+
+ // Steps 2-3.
+ assert(typeof flags === "number", "|flags| is a number value");
+
+ assert(typeof source === "string", "|source| is a string value");
+ assert(typeof lastIndex === "number", "|lastIndex| is a number value");
+
+ // Steps 4-9.
+ var iterator = NewRegExpStringIterator();
+ UnsafeSetReservedSlot(iterator, REGEXP_STRING_ITERATOR_REGEXP_SLOT, regexp);
+ UnsafeSetReservedSlot(iterator, REGEXP_STRING_ITERATOR_STRING_SLOT, string);
+ UnsafeSetReservedSlot(iterator, REGEXP_STRING_ITERATOR_SOURCE_SLOT, source);
+ UnsafeSetReservedSlot(iterator, REGEXP_STRING_ITERATOR_FLAGS_SLOT, flags | 0);
+ UnsafeSetReservedSlot(iterator, REGEXP_STRING_ITERATOR_LASTINDEX_SLOT, lastIndex);
+
+ // Step 10.
+ return iterator;
+}
+
+function IsRegExpStringIteratorNextOptimizable() {
+ var RegExpProto = GetBuiltinPrototype("RegExp");
+ // If RegExpPrototypeOptimizable succeeds, `RegExpProto.exec` is
+ // guaranteed to be a data property.
+ return RegExpPrototypeOptimizable(RegExpProto) &&
+ RegExpProto.exec === RegExp_prototype_Exec;
+}
+
+// String.prototype.matchAll proposal.
+//
+// %RegExpStringIteratorPrototype%.next ( )
+function RegExpStringIteratorNext() {
+ // Steps 1-3.
+ var obj;
+ if (!IsObject(this) || (obj = GuardToRegExpStringIterator(this)) === null) {
+ return callFunction(CallRegExpStringIteratorMethodIfWrapped, this,
+ "RegExpStringIteratorNext");
+ }
+
+ var result = { value: undefined, done: false };
+
+ // Step 4.
+ var lastIndex = UnsafeGetReservedSlot(obj, REGEXP_STRING_ITERATOR_LASTINDEX_SLOT);
+ if (lastIndex === REGEXP_STRING_ITERATOR_LASTINDEX_DONE) {
+ result.done = true;
+ return result;
+ }
+
+ // Step 5.
+ var regexp = UnsafeGetObjectFromReservedSlot(obj, REGEXP_STRING_ITERATOR_REGEXP_SLOT);
+
+ // Step 6.
+ var string = UnsafeGetStringFromReservedSlot(obj, REGEXP_STRING_ITERATOR_STRING_SLOT);
+
+ // Steps 7-8.
+ var flags = UnsafeGetInt32FromReservedSlot(obj, REGEXP_STRING_ITERATOR_FLAGS_SLOT);
+ var global = !!(flags & REGEXP_GLOBAL_FLAG);
+ var fullUnicode = !!(flags & REGEXP_UNICODE_FLAG);
+
+ if (lastIndex >= 0) {
+ assert(IsRegExpObject(regexp), "|regexp| is a RegExp object");
+
+ var source = UnsafeGetStringFromReservedSlot(obj, REGEXP_STRING_ITERATOR_SOURCE_SLOT);
+ if (IsRegExpStringIteratorNextOptimizable() &&
+ UnsafeGetStringFromReservedSlot(regexp, REGEXP_SOURCE_SLOT) === source &&
+ UnsafeGetInt32FromReservedSlot(regexp, REGEXP_FLAGS_SLOT) === flags)
+ {
+ // Step 9 (Inlined RegExpBuiltinExec).
+ var globalOrSticky = !!(flags & (REGEXP_GLOBAL_FLAG | REGEXP_STICKY_FLAG));
+ if (!globalOrSticky)
+ lastIndex = 0;
+
+ var match = (lastIndex <= string.length)
+ ? RegExpMatcher(regexp, string, lastIndex)
+ : null;
+
+ // Step 10.
+ if (match === null) {
+ // Step 10.a.
+ UnsafeSetReservedSlot(obj, REGEXP_STRING_ITERATOR_LASTINDEX_SLOT,
+ REGEXP_STRING_ITERATOR_LASTINDEX_DONE);
+
+ // Step 10.b.
+ result.done = true;
+ return result;
+ }
+
+ // Step 11.a.
+ if (global) {
+ // Step 11.a.i.
+ var matchLength = match[0].length;
+ lastIndex = match.index + matchLength;
+
+ // Step 11.a.ii.
+ if (matchLength === 0) {
+ // Steps 11.a.ii.1-3.
+ lastIndex = fullUnicode ? AdvanceStringIndex(string, lastIndex) : lastIndex + 1;
+ }
+
+ UnsafeSetReservedSlot(obj, REGEXP_STRING_ITERATOR_LASTINDEX_SLOT, lastIndex);
+ } else {
+ // Step 11.b.i.
+ UnsafeSetReservedSlot(obj, REGEXP_STRING_ITERATOR_LASTINDEX_SLOT,
+ REGEXP_STRING_ITERATOR_LASTINDEX_DONE);
+ }
+
+ // Steps 11.a.iii and 11.b.ii.
+ result.value = match;
+ return result;
+ }
+
+ // Reify the RegExp object.
+ regexp = regexp_construct_raw_flags(source, flags);
+ regexp.lastIndex = lastIndex;
+ UnsafeSetReservedSlot(obj, REGEXP_STRING_ITERATOR_REGEXP_SLOT, regexp);
+
+ // Mark the iterator as no longer optimizable.
+ UnsafeSetReservedSlot(obj, REGEXP_STRING_ITERATOR_LASTINDEX_SLOT,
+ REGEXP_STRING_ITERATOR_LASTINDEX_SLOW);
+ }
+
+ // Step 9.
+ var match = RegExpExec(regexp, string, false);
+
+ // Step 10.
+ if (match === null) {
+ // Step 10.a.
+ UnsafeSetReservedSlot(obj, REGEXP_STRING_ITERATOR_LASTINDEX_SLOT,
+ REGEXP_STRING_ITERATOR_LASTINDEX_DONE);
+
+ // Step 10.b.
+ result.done = true;
+ return result;
+ }
+
+ // Step 11.a.
+ if (global) {
+ // Step 11.a.i.
+ var matchStr = ToString(match[0]);
+
+ // Step 11.a.ii.
+ if (matchStr.length === 0) {
+ // Step 11.a.ii.1.
+ var thisIndex = ToLength(regexp.lastIndex);
+
+ // Step 11.a.ii.2.
+ var nextIndex = fullUnicode ? AdvanceStringIndex(string, thisIndex) : thisIndex + 1;
+
+ // Step 11.a.ii.3.
+ regexp.lastIndex = nextIndex;
+ }
+ } else {
+ // Step 11.b.i.
+ UnsafeSetReservedSlot(obj, REGEXP_STRING_ITERATOR_LASTINDEX_SLOT,
+ REGEXP_STRING_ITERATOR_LASTINDEX_DONE);
+ }
+
+ // Steps 11.a.iii and 11.b.ii.
+ result.value = match;
+ return result;
+}
+
+// ES2020 draft rev e97c95d064750fb949b6778584702dd658cf5624
+// 7.2.8 IsRegExp ( argument )
+function IsRegExp(argument) {
+ // Step 1.
+ if (!IsObject(argument)) {
+ return false;
+ }
+
+ // Step 2.
+ var matcher = argument[std_match];
+
+ // Step 3.
+ if (matcher !== undefined) {
+ return !!matcher;
+ }
+
+ // Steps 4-5.
+ return IsPossiblyWrappedRegExpObject(argument);
+}