Mercurial > hg > graal-jvmci-8

diff src/os_cpu/linux_x86/vm/assembler_linux_x86_32.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
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--- a/src/os_cpu/linux_x86/vm/assembler_linux_x86_32.cpp	Fri Jul 11 01:14:44 2008 -0700
+++ b/src/os_cpu/linux_x86/vm/assembler_linux_x86_32.cpp	Sat Jul 19 17:38:22 2008 -0400
@@ -39,10 +39,3 @@
 
   movptr(thread, tls);
 }
-
-bool MacroAssembler::needs_explicit_null_check(intptr_t offset) {
-  // Linux kernel guarantees that the first page is always unmapped. Don't
-  // assume anything more than that.
-  bool offset_in_first_page =   0 <= offset  &&  offset < os::vm_page_size();
-  return !offset_in_first_page;
-}