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1 /*
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2 * Copyright 2004-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 # include "incls/_precompiled.incl"
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26 # include "incls/_dump_sparc.cpp.incl"
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27
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28
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29
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30 // Generate the self-patching vtable method:
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31 //
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32 // This method will be called (as any other Klass virtual method) with
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33 // the Klass itself as the first argument. Example:
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34 //
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35 // oop obj;
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36 // int size = obj->klass()->klass_part()->oop_size(this);
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37 //
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38 // for which the virtual method call is Klass::oop_size();
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39 //
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40 // The dummy method is called with the Klass object as the first
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41 // operand, and an object as the second argument.
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42 //
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43
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44 //=====================================================================
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45
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46 // All of the dummy methods in the vtable are essentially identical,
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47 // differing only by an ordinal constant, and they bear no releationship
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48 // to the original method which the caller intended. Also, there needs
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49 // to be 'vtbl_list_size' instances of the vtable in order to
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50 // differentiate between the 'vtable_list_size' original Klass objects.
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51
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52 #define __ masm->
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53
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54 void CompactingPermGenGen::generate_vtable_methods(void** vtbl_list,
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55 void** vtable,
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56 char** md_top,
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57 char* md_end,
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58 char** mc_top,
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59 char* mc_end) {
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60
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61 intptr_t vtable_bytes = (num_virtuals * vtbl_list_size) * sizeof(void*);
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62 *(intptr_t *)(*md_top) = vtable_bytes;
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63 *md_top += sizeof(intptr_t);
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64 void** dummy_vtable = (void**)*md_top;
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65 *vtable = dummy_vtable;
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66 *md_top += vtable_bytes;
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67
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68 guarantee(*md_top <= md_end, "Insufficient space for vtables.");
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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 Label common_code;
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76 for (int i = 0; i < vtbl_list_size; ++i) {
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77 for (int j = 0; j < num_virtuals; ++j) {
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78 dummy_vtable[num_virtuals * i + j] = (void*)masm->pc();
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79 __ save(SP, -256, SP);
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80 __ brx(Assembler::always, false, Assembler::pt, common_code);
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81
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82 // Load L0 with a value indicating vtable/offset pair.
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83 // -- bits[ 7..0] (8 bits) which virtual method in table?
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84 // -- bits[12..8] (5 bits) which virtual method table?
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85 // -- must fit in 13-bit instruction immediate field.
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86 __ delayed()->set((i << 8) + j, L0);
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87 }
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88 }
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89
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90 __ bind(common_code);
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91
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92 // Expecting to be called with the "this" pointer in O0/I0 (where
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93 // "this" is a Klass object). In addition, L0 was set (above) to
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94 // identify the method and table.
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95
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96 // Look up the correct vtable pointer.
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97
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98 __ set((intptr_t)vtbl_list, L2); // L2 = address of new vtable list.
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99 __ srl(L0, 8, L3); // Isolate L3 = vtable identifier.
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100 __ sll(L3, LogBytesPerWord, L3);
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101 __ ld_ptr(L2, L3, L3); // L3 = new (correct) vtable pointer.
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102 __ st_ptr(L3, Address(I0, 0)); // Save correct vtable ptr in entry.
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103
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104 // Restore registers and jump to the correct method;
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105
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106 __ and3(L0, 255, L4); // Isolate L3 = method offset;.
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107 __ sll(L4, LogBytesPerWord, L4);
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108 __ ld_ptr(L3, L4, L4); // Get address of correct virtual method
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109 Address method(L4, 0);
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110 __ jmpl(method, G0); // Jump to correct method.
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111 __ delayed()->restore(); // Restore registers.
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112
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113 __ flush();
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114 *mc_top = (char*)__ pc();
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115
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116 guarantee(*mc_top <= mc_end, "Insufficient space for method wrappers.");
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117 }
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