Revert of [regexp] Port RegExpCompile and RegExpToString

src/js/regexp.js

Index: src/js/regexp.js
diff --git a/src/js/regexp.js b/src/js/regexp.js
index 584d4cdf41bdbe58c76cb3bd9ee22249f34f494a..e51a6d227a8d40ef2308cfeb1eed557c44656f4f 100644
--- a/src/js/regexp.js
+++ b/src/js/regexp.js
@@ -68,6 +68,36 @@
   flags = IS_UNDEFINED(flags) ? '' : TO_STRING(flags);
   %RegExpInitializeAndCompile(object, pattern, flags);
   return object;
+}
+
+
+function PatternFlags(pattern) {
+  return (REGEXP_GLOBAL(pattern) ? 'g' : '') +
+         (REGEXP_IGNORE_CASE(pattern) ? 'i' : '') +
+         (REGEXP_MULTILINE(pattern) ? 'm' : '') +
+         (REGEXP_UNICODE(pattern) ? 'u' : '') +
+         (REGEXP_STICKY(pattern) ? 'y' : '');
+}
+
+
+// ES#sec-regexp.prototype.compile RegExp.prototype.compile (pattern, flags)
+function RegExpCompileJS(pattern, flags) {
+  if (!IS_REGEXP(this)) {
+    throw %make_type_error(kIncompatibleMethodReceiver,
+                        "RegExp.prototype.compile", this);
+  }
+
+  if (IS_REGEXP(pattern)) {
+    if (!IS_UNDEFINED(flags)) throw %make_type_error(kRegExpFlags);
+
+    flags = PatternFlags(pattern);
+    pattern = REGEXP_SOURCE(pattern);
+  }
+
+  RegExpInitialize(this, pattern, flags);
+
+  // Return undefined for compatibility with JSC.
+  // See http://crbug.com/585775 for web compat details.
 }
 
 
@@ -302,6 +332,18 @@
                                       : REGEXP_MULTILINE(regexp) ? "m" : ""));
   }
   return regexp_val;
+}
+
+
+function RegExpToString() {
+  if (!IS_RECEIVER(this)) {
+    throw %make_type_error(
+        kIncompatibleMethodReceiver, 'RegExp.prototype.toString', this);
+  }
+  if (this === GlobalRegExp.prototype) {
+    %IncrementUseCounter(kRegExpPrototypeToString);
+  }
+  return '/' + TO_STRING(this.source) + '/' + TO_STRING(this.flags);
 }
 
 
@@ -887,6 +929,8 @@
 utils.InstallFunctions(GlobalRegExp.prototype, DONT_ENUM, [
   "exec", RegExpSubclassExecJS,
   "test", RegExpSubclassTest,
+  "toString", RegExpToString,
+  "compile", RegExpCompileJS,
   matchSymbol, RegExpSubclassMatch,
   replaceSymbol, RegExpSubclassReplace,
   searchSymbol, RegExpSubclassSearch,