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diff src/cpu/x86/vm/sharedRuntime_x86_64.cpp @ 848:fe95187e8882

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6859338: amd64 native unverified entry point pushes values before implicit null check Reviewed-by: kvn, twisti
author never
date Mon, 13 Jul 2009 14:58:17 -0700
parents 69aefafe69c1
children e66fd840cb6b
line wrap: on
line diff
--- a/src/cpu/x86/vm/sharedRuntime_x86_64.cpp	Thu Jul 02 16:18:19 2009 -0700
+++ b/src/cpu/x86/vm/sharedRuntime_x86_64.cpp	Mon Jul 13 14:58:17 2009 -0700
@@ -1302,22 +1302,19 @@
 
   const Register ic_reg = rax;
   const Register receiver = j_rarg0;
-  const Register tmp = rdx;
 
   Label ok;
   Label exception_pending;
 
+  assert_different_registers(ic_reg, receiver, rscratch1);
   __ verify_oop(receiver);
-  __ push(tmp); // spill (any other registers free here???)
-  __ load_klass(tmp, receiver);
-  __ cmpq(ic_reg, tmp);
+  __ load_klass(rscratch1, receiver);
+  __ cmpq(ic_reg, rscratch1);
   __ jcc(Assembler::equal, ok);
 
-  __ pop(tmp);
   __ jump(RuntimeAddress(SharedRuntime::get_ic_miss_stub()));
 
   __ bind(ok);
-  __ pop(tmp);
 
   // Verified entry point must be aligned
   __ align(8);