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comparison src/share/vm/memory/barrierSet.hpp @ 2324:0ac769a57c64

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6627983: G1: Bad oop deference during marking Summary: 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
author iveresov
date Tue, 01 Mar 2011 14:56:48 -0800
parents f95d63e2154a
children fd09f2d8283e
comparison
equal deleted inserted replaced
2323:bc6b27fb3568 2324:0ac769a57c64
1 /* 1 /*
2 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. 2 * Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
42 G1SATBCTLogging, 42 G1SATBCTLogging,
43 Other, 43 Other,
44 Uninit 44 Uninit
45 }; 45 };
46 46
47 enum Flags {
48 None = 0,
49 TargetUninitialized = 1
50 };
47 protected: 51 protected:
48 int _max_covered_regions; 52 int _max_covered_regions;
49 Name _kind; 53 Name _kind;
50 54
51 public: 55 public:
126 // barrier for an array whose elements are all in the given memory region. 130 // barrier for an array whose elements are all in the given memory region.
127 virtual void read_ref_array(MemRegion mr) = 0; 131 virtual void read_ref_array(MemRegion mr) = 0;
128 virtual void read_prim_array(MemRegion mr) = 0; 132 virtual void read_prim_array(MemRegion mr) = 0;
129 133
130 // Below length is the # array elements being written 134 // Below length is the # array elements being written
131 virtual void write_ref_array_pre( oop* dst, int length) {} 135 virtual void write_ref_array_pre(oop* dst, int length,
132 virtual void write_ref_array_pre(narrowOop* dst, int length) {} 136 bool dest_uninitialized = false) {}
137 virtual void write_ref_array_pre(narrowOop* dst, int length,
138 bool dest_uninitialized = false) {}
133 // Below count is the # array elements being written, starting 139 // Below count is the # array elements being written, starting
134 // at the address "start", which may not necessarily be HeapWord-aligned 140 // at the address "start", which may not necessarily be HeapWord-aligned
135 inline void write_ref_array(HeapWord* start, size_t count); 141 inline void write_ref_array(HeapWord* start, size_t count);
136 142
137 // Static versions, suitable for calling from generated code; 143 // Static versions, suitable for calling from generated code;