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 2008, 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.
23 *
24 */
26 #ifndef SHARE_VM_SHARK_SHARKSTATESCANNER_HPP
27 #define SHARE_VM_SHARK_SHARKSTATESCANNER_HPP
29 #include "memory/allocation.hpp"
30 #include "shark/llvmHeaders.hpp"
31 #include "shark/sharkFunction.hpp"
32 #include "shark/sharkInvariants.hpp"
34 class SharkState;
36 class SharkStateScanner : public SharkTargetInvariants {
37 protected:
38 SharkStateScanner(SharkFunction* function)
39 : SharkTargetInvariants(function), _stack(function->stack()) {}
41 private:
42 SharkStack* _stack;
44 protected:
45 SharkStack* stack() const {
46 return _stack;
47 }
49 // Scan the frame
50 public:
51 void scan(SharkState* state);
53 // Callbacks
54 // Note that the offsets supplied to the various process_* callbacks
55 // are specified in wordSize words from the frame's unextended_sp.
56 protected:
57 virtual void start_frame() {}
59 virtual void start_stack(int stack_depth) {}
60 virtual void process_stack_slot(int index, SharkValue** value, int offset) {}
61 virtual void end_stack() {}
63 virtual void start_monitors(int num_monitors) {}
64 virtual void process_monitor(int index, int box_offset, int obj_offset) {}
65 virtual void end_monitors() {}
67 virtual void start_frame_header() {}
68 virtual void process_oop_tmp_slot(llvm::Value** value, int offset) {}
69 virtual void process_method_slot(llvm::Value** value, int offset) {}
70 virtual void process_pc_slot(int offset) {}
71 virtual void end_frame_header() {}
73 virtual void start_locals() {}
74 virtual void process_local_slot(int index, SharkValue** value, int offset) {}
75 virtual void end_locals() {}
77 virtual void end_frame() {}
79 // Integrity checks
80 private:
81 void stack_integrity_checks(SharkState* state) PRODUCT_RETURN;
82 void locals_integrity_checks(SharkState* state) PRODUCT_RETURN;
83 };
85 #endif // SHARE_VM_SHARK_SHARKSTATESCANNER_HPP