Tue, 18 Jun 2013 12:31:07 -0700
8015237: Parallelize string table scanning during strong root processing
Summary: Parallelize the scanning of the intern string table by having each GC worker claim a given number of buckets. Changes were also reviewed by Per Liden <per.liden@oracle.com>.
Reviewed-by: tschatzl, stefank, twisti
1 /*
2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
3 * Copyright 2009 Red Hat, Inc.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
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24 */
26 #ifndef SHARE_VM_SHARK_SHARKCODEBUFFER_HPP
27 #define SHARE_VM_SHARK_SHARKCODEBUFFER_HPP
29 #include "asm/codeBuffer.hpp"
30 #include "memory/allocation.hpp"
31 #include "shark/llvmHeaders.hpp"
33 class SharkCodeBuffer : public StackObj {
34 public:
35 SharkCodeBuffer(MacroAssembler* masm)
36 : _masm(masm), _base_pc(NULL) {}
38 private:
39 MacroAssembler* _masm;
40 llvm::Value* _base_pc;
42 private:
43 MacroAssembler* masm() const {
44 return _masm;
45 }
47 public:
48 llvm::Value* base_pc() const {
49 return _base_pc;
50 }
51 void set_base_pc(llvm::Value* base_pc) {
52 assert(_base_pc == NULL, "only do this once");
53 _base_pc = base_pc;
54 }
56 // Allocate some space in the buffer and return its address.
57 // This buffer will have been relocated by the time the method
58 // is installed, so you can't inline the result in code.
59 public:
60 void* malloc(size_t size) const {
61 masm()->align(BytesPerWord);
62 void *result = masm()->pc();
63 masm()->advance(size);
64 return result;
65 }
67 // Create a unique offset in the buffer.
68 public:
69 int create_unique_offset() const {
70 int offset = masm()->offset();
71 masm()->advance(1);
72 return offset;
73 }
75 // Inline an oop into the buffer and return its offset.
76 public:
77 int inline_oop(jobject object) const {
78 masm()->align(BytesPerWord);
79 int offset = masm()->offset();
80 masm()->store_oop(object);
81 return offset;
82 }
84 int inline_Metadata(Metadata* metadata) const {
85 masm()->align(BytesPerWord);
86 int offset = masm()->offset();
87 masm()->store_Metadata(metadata);
88 return offset;
89 }
91 // Inline a block of non-oop data into the buffer and return its offset.
92 public:
93 int inline_data(void *src, size_t size) const {
94 masm()->align(BytesPerWord);
95 int offset = masm()->offset();
96 void *dst = masm()->pc();
97 masm()->advance(size);
98 memcpy(dst, src, size);
99 return offset;
100 }
101 };
103 #endif // SHARE_VM_SHARK_SHARKCODEBUFFER_HPP