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diff src/os_cpu/solaris_x86/vm/assembler_solaris_x86_64.cpp @ 237:1fdb98a17101

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6716785: implicit null checks not triggering with CompressedOops Summary: allocate alignment-sized page(s) below java heap so that memory accesses at heap_base+1page give signal and cause an implicit null check Reviewed-by: kvn, jmasa, phh, jcoomes
author coleenp
date Sat, 19 Jul 2008 17:38:22 -0400
parents d1605aabd0a1
children
line wrap: on
line diff
--- a/src/os_cpu/solaris_x86/vm/assembler_solaris_x86_64.cpp	Fri Jul 11 01:14:44 2008 -0700
+++ b/src/os_cpu/solaris_x86/vm/assembler_solaris_x86_64.cpp	Sat Jul 19 17:38:22 2008 -0400
@@ -85,22 +85,3 @@
     popq(rax);
   }
 }
-
-bool MacroAssembler::needs_explicit_null_check(intptr_t offset) {
-  // Identical to Sparc/Solaris code
-
-  // Exception handler checks the nmethod's implicit null checks table
-  // only when this method returns false.
-  if (UseCompressedOops) {
-    // The first page after heap_base is unmapped and
-    // the 'offset' is equal to [heap_base + offset] for
-    // narrow oop implicit null checks.
-    uintptr_t heap_base = (uintptr_t)Universe::heap_base();
-    if ((uintptr_t)offset >= heap_base) {
-      // Normalize offset for the next check.
-      offset = (intptr_t)(pointer_delta((void*)offset, (void*)heap_base, 1));
-    }
-  }
-  bool offset_in_first_page = 0 <= offset && offset < os::vm_page_size();
-  return !offset_in_first_page;
-}