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annotate src/share/vm/oops/compiledICHolder.hpp @ 14206:e7b58922266b
8028412: AsyncGetCallTrace() is broken on x86 in JDK 7u40
Reviewed-by: kvn, sspitsyn
author | mgronlun |
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date | Thu, 05 Dec 2013 12:35:38 +0100 |
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0 | 1 /* |
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2 * Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
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 | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP |
26 #define SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP | |
27 | |
28 #include "oops/oop.hpp" | |
29 | |
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30 // A CompiledICHolder* is a helper object for the inline cache implementation. |
0 | 31 // It holds an intermediate value (method+klass pair) used when converting from |
32 // compiled to an interpreted call. | |
33 // | |
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34 // These are always allocated in the C heap and are freed during a |
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35 // safepoint by the ICBuffer logic. It's unsafe to free them earlier |
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36 // since they might be in use. |
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37 // |
0 | 38 |
39 | |
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40 class CompiledICHolder : public CHeapObj<mtCompiler> { |
0 | 41 friend class VMStructs; |
42 private: | |
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43 static volatile int _live_count; // allocated |
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44 static volatile int _live_not_claimed_count; // allocated but not yet in use so not |
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45 // reachable by iterating over nmethods |
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46 |
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47 Method* _holder_method; |
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48 Klass* _holder_klass; // to avoid name conflict with oopDesc::_klass |
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49 CompiledICHolder* _next; |
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50 |
0 | 51 public: |
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52 // Constructor |
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53 CompiledICHolder(Method* method, Klass* klass) |
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54 : _holder_method(method), _holder_klass(klass) { |
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55 #ifdef ASSERT |
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56 Atomic::inc(&_live_count); |
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57 Atomic::inc(&_live_not_claimed_count); |
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58 #endif |
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59 } |
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60 |
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61 ~CompiledICHolder() { |
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62 #ifdef ASSERT |
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63 assert(_live_count > 0, "underflow"); |
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64 Atomic::dec(&_live_count); |
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65 #endif |
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66 } |
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67 |
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68 static int live_count() { return _live_count; } |
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69 static int live_not_claimed_count() { return _live_not_claimed_count; } |
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70 |
0 | 71 // accessors |
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72 Method* holder_method() const { return _holder_method; } |
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73 Klass* holder_klass() const { return _holder_klass; } |
0 | 74 |
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75 void set_holder_method(Method* m) { _holder_method = m; } |
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76 void set_holder_klass(Klass* k) { _holder_klass = k; } |
0 | 77 |
78 // interpreter support (offsets in bytes) | |
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79 static int holder_method_offset() { return offset_of(CompiledICHolder, _holder_method); } |
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80 static int holder_klass_offset() { return offset_of(CompiledICHolder, _holder_klass); } |
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81 |
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82 CompiledICHolder* next() { return _next; } |
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83 void set_next(CompiledICHolder* n) { _next = n; } |
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84 |
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85 // Verify |
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86 void verify_on(outputStream* st); |
0 | 87 |
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88 // Printing |
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89 void print_on(outputStream* st) const; |
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90 void print_value_on(outputStream* st) const; |
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91 |
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92 const char* internal_name() const { return "{compiledICHolder}"; } |
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93 |
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94 void claim() { |
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95 #ifdef ASSERT |
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96 Atomic::dec(&_live_not_claimed_count); |
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97 #endif |
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98 } |
0 | 99 }; |
1972 | 100 |
101 #endif // SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP |