Cache results in SearchRegExpMultiple.

test/mjsunit/regexp-results-cache.js

Index: test/mjsunit/regexp-results-cache.js
diff --git a/test/mjsunit/regexp-results-cache.js b/test/mjsunit/regexp-results-cache.js
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+// Copyright 2012 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Long string to trigger caching.
+var string =
+"Friends, Romans, countrymen, lend me your ears!  \
+ I come to bury Caesar, not to praise him.        \
+ The evil that men do lives after them,           \
+ The good is oft interred with their bones;       \
+ So let it be with Caesar. The noble Brutus       \
+ Hath told you Caesar was ambitious;              \
+ If it were so, it was a grievous fault,          \
+ And grievously hath Caesar answer'd it.          \
+ Here, under leave of Brutus and the rest-        \
+ For Brutus is an honorable man;                  \
+ So are they all, all honorable men-              \
+ Come I to speak in Caesar's funeral.             \
+ He was my friend, faithful and just to me;       \
+ But Brutus says he was ambitious,                \
+ And Brutus is an honorable man.                  \
+ He hath brought many captives home to Rome,      \
+ Whose ransoms did the general coffers fill.      \
+ Did this in Caesar seem ambitious?               \
+ When that the poor have cried, Caesar hath wept; \
+ Ambition should be made of sterner stuff:        \
+ Yet Brutus says he was ambitious,                \
+ And Brutus is an honorable man.                  \
+ You all did see that on the Lupercal             \
+ I thrice presented him a kingly crown,           \
+ Which he did thrice refuse. Was this ambition?   \
+ Yet Brutus says he was ambitious,                \
+ And sure he is an honorable man.                 \
+ I speak not to disprove what Brutus spoke,       \
+ But here I am to speak what I do know.           \
+ You all did love him once, not without cause;    \
+ What cause withholds you then to mourn for him?  \
+ O judgement, thou art fled to brutish beasts,    \
+ And men have lost their reason. Bear with me;    \
+ My heart is in the coffin there with Caesar,     \
+ And I must pause till it come back to me.";
+
+var replaced = string.replace(/\b\w+\b/g, function() { return "foo"; });
+for (var i = 0; i < 3; i++) {
+  assertEquals(replaced,
+               string.replace(/\b\w+\b/g, function() { return "foo"; }));
+}
+
+// Check that the result is in a COW array.
+var words = string.split(" ");
+assertEquals("Friends,", words[0]);
+words[0] = "Enemies,";
+words = string.split(" ");
+assertEquals("Friends,", words[0]);
+