1 /* |
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2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. |
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3 * Copyright (c) 2016 SAP SE. All rights reserved. |
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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5 * |
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6 * This code is free software; you can redistribute it and/or modify it |
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7 * under the terms of the GNU General Public License version 2 only, as |
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8 * published by the Free Software Foundation. |
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9 * |
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10 * This code is distributed in the hope that it will be useful, but WITHOUT |
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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13 * version 2 for more details (a copy is included in the LICENSE file that |
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14 * accompanied this code). |
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15 * |
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16 * You should have received a copy of the GNU General Public License version |
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17 * 2 along with this work; if not, write to the Free Software Foundation, |
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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19 * |
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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21 * or visit www.oracle.com if you need additional information or have any |
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22 * questions. |
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23 * |
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24 */ |
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25 |
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26 #include "precompiled.hpp" |
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27 #include "asm/codeBuffer.hpp" |
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28 #include "asm/macroAssembler.inline.hpp" |
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29 #include "memory/metaspaceShared.hpp" |
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30 |
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31 // Generate the self-patching vtable method: |
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32 // |
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33 // This method will be called (as any other Klass virtual method) with |
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34 // the Klass itself as the first argument. Example: |
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35 // |
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36 // oop obj; |
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37 // int size = obj->klass()->klass_part()->oop_size(this); |
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38 // |
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39 // for which the virtual method call is Klass::oop_size();. |
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40 // |
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41 // The dummy method is called with the Klass object as the first |
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42 // operand, and an object as the second argument. |
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43 // |
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44 |
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45 //===================================================================== |
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46 |
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47 // All of the dummy methods in the vtable are essentially identical, |
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48 // differing only by an ordinal constant, and they bear no releationship |
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49 // to the original method which the caller intended. Also, there needs |
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50 // to be 'vtbl_list_size' instances of the vtable in order to |
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51 // differentiate between the 'vtable_list_size' original Klass objects. |
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52 |
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53 #undef __ |
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54 #define __ masm-> |
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55 |
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56 void MetaspaceShared::generate_vtable_methods(void** vtbl_list, |
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57 void** vtable, |
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58 char** md_top, |
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59 char* md_end, |
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60 char** mc_top, |
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61 char* mc_end) { |
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62 |
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63 intptr_t vtable_bytes = (num_virtuals * vtbl_list_size) * sizeof(void*); |
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64 *(intptr_t *)(*md_top) = vtable_bytes; |
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65 *md_top += sizeof(intptr_t); |
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66 void** dummy_vtable = (void**)*md_top; |
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67 *vtable = dummy_vtable; |
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68 *md_top += vtable_bytes; |
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69 |
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70 // Get ready to generate dummy methods. |
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71 |
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72 CodeBuffer cb((unsigned char*)*mc_top, mc_end - *mc_top); |
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73 MacroAssembler* masm = new MacroAssembler(&cb); |
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74 |
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75 __ unimplemented(); |
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76 } |
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