Limit the generation of regexp code with large inlined constants.

src/jsregexp.h

Index: src/jsregexp.h
===================================================================
--- src/jsregexp.h	(revision 7820)
+++ src/jsregexp.h	(working copy)
@@ -176,6 +176,14 @@
   static ByteArray* IrregexpByteCode(FixedArray* re, bool is_ascii);
   static Code* IrregexpNativeCode(FixedArray* re, bool is_ascii);
 
+  // Limit the space regexps take up on the heap.  In order to limit this we
+  // would like to keep track of the amount of regexp code on the heap.  This
+  // is not tracked, however.  As a conservative approximation we track the
+  // total regexp code compiled including code that has subsequently been freed
+  // and the total executable memory at any point.
+  static const int kRegExpExecutableMemoryLimit = 16 * MB;
+  static const int kRegWxpCompiledLimit = 1 * MB;
+
  private:
   static String* last_ascii_string_;
   static String* two_byte_cached_string_;