Use direct jump and call instruction for X64 when the deoptimization entries are in the code range

src/objects.cc

Index: src/objects.cc
===================================================================
--- src/objects.cc	(revision 13543)
+++ src/objects.cc	(working copy)
@@ -8624,6 +8624,13 @@
       Code* code = Code::cast(*p);
       it.rinfo()->set_target_address(code->instruction_start(),
                                      SKIP_WRITE_BARRIER);
+#if defined(V8_TARGET_ARCH_X64)

[danno, 2013/02/06 15:00:38]

I would very much like to avoid having platform #ifdefs in shared code. I think
a better solution is to add a new method of RelocInfo, something like
set_runtime_entry_address, which has a platform-specific implementation and
makes the offset relative on platforms that support it, just like
set_target_address does. With that in place, you could always execute the code
below, getting the "raw" address using a specialized call similar to what code
targets do above, e.g.:

 Address p = it.rinfo()->absolute_runtime_entry_address(origin);
it.rinfo()->set_target_runtime_entry_address(origin);

[haitao.feng, 2013/02/07 05:08:05]

Done.

+    } else if (RelocInfo::IsRuntimeEntry(mode)) {
+      // rewrite runtime entries in optimized codes to direct
+      // pointers to the entry
+      Address p = it.rinfo()->target_runtime_entry(origin);
+      it.rinfo()->set_target_address(p, SKIP_WRITE_BARRIER);
+#endif
     } else {
       it.rinfo()->apply(delta);
     }