Mercurial > hg > truffle
annotate src/share/vm/oops/metadata.hpp @ 14714:b602356a9cfc
additional canonicalizers for accesses and value nodes (improves number of implicit null checks)
author | Lukas Stadler <lukas.stadler@oracle.com> |
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date | Thu, 20 Mar 2014 17:15:36 +0100 |
parents | 7380034e5b31 |
children | 92aa6797d639 52b4284cb496 |
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1 /* |
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2 * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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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. |
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22 * |
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23 */ |
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24 |
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25 #ifndef SHARE_VM_OOPS_METADATA_HPP |
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26 #define SHARE_VM_OOPS_METADATA_HPP |
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27 |
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28 #include "utilities/exceptions.hpp" |
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29 #include "utilities/globalDefinitions.hpp" |
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30 #include "utilities/ostream.hpp" |
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31 |
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32 // This is the base class for an internal Class related metadata |
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33 class Metadata : public MetaspaceObj { |
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34 // Debugging hook to check that the metadata has not been deleted. |
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35 NOT_PRODUCT(int _valid;) |
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36 public: |
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37 NOT_PRODUCT(Metadata() { _valid = 0; }) |
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38 NOT_PRODUCT(bool is_valid() const volatile { return _valid == 0; }) |
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39 |
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40 int identity_hash() { return (int)(uintptr_t)this; } |
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41 |
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42 // Rehashing support for tables containing pointers to this |
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43 unsigned int new_hash(juint seed) { ShouldNotReachHere(); return 0; } |
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44 |
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45 virtual bool is_metadata() const volatile { return true; } |
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46 virtual bool is_klass() const volatile { return false; } |
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47 virtual bool is_method() const volatile { return false; } |
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48 virtual bool is_methodData() const volatile { return false; } |
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49 virtual bool is_constantPool() const volatile { return false; } |
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50 |
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51 virtual const char* internal_name() const = 0; |
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52 |
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53 void print() const { print_on(tty); } |
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54 void print_value() const { print_value_on(tty); } |
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55 |
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56 void print_maybe_null() const { print_on_maybe_null(tty); } |
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57 void print_on_maybe_null(outputStream* st) const { |
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58 if (this == NULL) |
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59 st->print("NULL"); |
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60 else |
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61 print_on(tty); |
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62 } |
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63 void print_value_on_maybe_null(outputStream* st) const { |
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64 if (this == NULL) |
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65 st->print("NULL"); |
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66 else |
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67 print_value_on(tty); |
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68 } |
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69 |
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70 virtual void print_on(outputStream* st) const; // First level print |
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71 virtual void print_value_on(outputStream* st) const = 0; // Second level print |
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72 |
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73 char* print_value_string() const; |
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74 |
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75 // Used to keep metadata alive during class redefinition |
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76 // Can't assert because is called for delete functions (as an assert) |
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77 virtual bool on_stack() const { return false; } |
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78 virtual void set_on_stack(const bool value); |
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79 |
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80 // Set on_stack bit, so that the metadata is not cleared |
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81 // during class redefinition. This is a virtual call because only methods |
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82 // and constant pools need to be set, but someday instanceKlasses might also. |
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83 static void mark_on_stack(Metadata* m) { m->set_on_stack(true); } |
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84 }; |
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85 |
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86 #endif // SHARE_VM_OOPS_METADATA_HPP |