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6627983: G1: Bad oop deference during marking

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Bulk zeroing reduction didn't work with G1, because arraycopy would call pre-barriers on uninitialized oops. The solution is to have version of arraycopy stubs that don't have pre-barriers. Also refactored arraycopy stubs generation on SPARC to be more readable and reduced the number of stubs necessary in some cases.

Reviewed-by: jrose, kvn, never
This commit is contained in:
Igor Veresov 2011-03-01 14:56:48 -08:00
parent 5432554ecb
commit 90a153aa38
10 changed files with 353 additions and 205 deletions
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12
hotspot/src/share/vm/memory/barrierSet.hpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -44,6 +44,10 @@ public:
Uninit
};
enum Flags {
None = 0,
TargetUninitialized = 1
};
protected:
int _max_covered_regions;
Name _kind;
@ -128,8 +132,10 @@ public:
virtual void read_prim_array(MemRegion mr) = 0;
// Below length is the # array elements being written
virtual void write_ref_array_pre( oop* dst, int length) {}
virtual void write_ref_array_pre(narrowOop* dst, int length) {}
virtual void write_ref_array_pre(oop* dst, int length,
bool dest_uninitialized = false) {}
virtual void write_ref_array_pre(narrowOop* dst, int length,
bool dest_uninitialized = false) {}
// Below count is the # array elements being written, starting
// at the address "start", which may not necessarily be HeapWord-aligned
inline void write_ref_array(HeapWord* start, size_t count);