Add X32 port into V8

test/cctest/test-mark-compact.cc

 // 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
@@ skipping 540 matching lines @@
     intptr_t delta = MemoryInUse() - initial_memory;
     printf("delta: %" V8_PTR_PREFIX "d kB\n", delta / 1024);
     if (sizeof(initial_memory) == 8) {  // 64-bit.
       if (v8::internal::Snapshot::IsEnabled()) {
         CHECK_LE(delta, 4000 * 1024);
       } else {
         CHECK_LE(delta, 4500 * 1024);
       }
     } else {                            // 32-bit.
       if (v8::internal::Snapshot::IsEnabled()) {
+#ifndef V8_TARGET_ARCH_X32

[danno, 2013/07/17 13:33:21]

I don't think the limits should be special cased, or if they are, they should be
for all platforms. Otherwise, if x32 is under ia32, it should just the same
high-water mark.

         CHECK_LE(delta, 3100 * 1024);
+#else
+        CHECK_LE(delta, 3700 * 1024);
+#endif
       } else {
+#ifndef V8_TARGET_ARCH_X32
         CHECK_LE(delta, 3400 * 1024);
+#else
+        CHECK_LE(delta, 3900 * 1024);
+#endif
       }
     }
   }
 }
 
 
 intptr_t ShortLivingIsolate() {
   v8::Isolate* isolate = v8::Isolate::New();
   { v8::Isolate::Scope isolate_scope(isolate);
     v8::Locker lock(isolate);
     v8::HandleScope handle_scope;
     v8::Local<v8::Context> context = v8::Context::New(isolate);
     CHECK(!context.IsEmpty());
   }
   isolate->Dispose();
   return MemoryInUse();
 }
 
 
 TEST(RegressJoinThreadsOnIsolateDeinit) {
   intptr_t size_limit = ShortLivingIsolate() * 2;
   for (int i = 0; i < 10; i++) {
     CHECK_GT(size_limit, ShortLivingIsolate());
   }
 }
 
 #endif  // __linux__ and !USE_SIMULATOR