Lower heap size limits on systems that are short of virtual memory.

src/platform-posix.cc

 // Copyright 2011 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
@@ skipping 36 matching lines @@
 #include <utils/Log.h>  // LOG_PRI_VA
 #endif
 
 #include "v8.h"
 
 #include "platform.h"
 
 namespace v8 {
 namespace internal {
 
+
+// Maximum size of the virtual memory.  0 means there is no artificial
+// limit.
+
+intptr_t OS::MaxVirtualMemory() {
+  struct rlimit limit;
+  int result = getrlimit(RLIMIT_DATA, &limit);
+  if (result != 0) return 0;
+  return limit.rlim_cur;
+}
+
+
 // ----------------------------------------------------------------------------
 // Math functions
 
 double modulo(double x, double y) {
   return fmod(x, y);
 }
 
 
 double OS::nan_value() {
   // NAN from math.h is defined in C99 and not in POSIX.
@@ skipping 348 matching lines @@
   return ntohl(value);
 }
 
 
 Socket* OS::CreateSocket() {
   return new POSIXSocket();
 }
 
 
 } }  // namespace v8::internal