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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_x86_32.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 // Get ready to generate dummy methods.
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69
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70 CodeBuffer cb((unsigned char*)*mc_top, mc_end - *mc_top);
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71 MacroAssembler* masm = new MacroAssembler(&cb);
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72
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73 Label common_code;
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74 for (int i = 0; i < vtbl_list_size; ++i) {
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75 for (int j = 0; j < num_virtuals; ++j) {
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76 dummy_vtable[num_virtuals * i + j] = (void*)masm->pc();
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77
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78 // Load rax, with a value indicating vtable/offset pair.
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79 // -- bits[ 7..0] (8 bits) which virtual method in table?
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80 // -- bits[12..8] (5 bits) which virtual method table?
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81 // -- must fit in 13-bit instruction immediate field.
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82 __ movl(rax, (i << 8) + j);
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83 __ jmp(common_code);
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84 }
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85 }
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86
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87 __ bind(common_code);
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88
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89 #ifdef WIN32
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90 // Expecting to be called with "thiscall" conventions -- the arguments
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91 // are on the stack, except that the "this" pointer is in rcx.
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92 #else
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93 // Expecting to be called with Unix conventions -- the arguments
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94 // are on the stack, including the "this" pointer.
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95 #endif
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96
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97 // In addition, rax was set (above) to the offset of the method in the
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98 // table.
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99
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100 #ifdef WIN32
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101 __ pushl(rcx); // save "this"
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102 #endif
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103 __ movl(rcx, rax);
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104 __ shrl(rcx, 8); // isolate vtable identifier.
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105 __ shll(rcx, LogBytesPerWord);
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106 Address index(noreg, rcx, Address::times_1);
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107 ExternalAddress vtbl((address)vtbl_list);
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108 __ movptr(rdx, ArrayAddress(vtbl, index)); // get correct vtable address.
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109 #ifdef WIN32
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110 __ popl(rcx); // restore "this"
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111 #else
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112 __ movl(rcx, Address(rsp, 4)); // fetch "this"
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113 #endif
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114 __ movl(Address(rcx, 0), rdx); // update vtable pointer.
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115
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116 __ andl(rax, 0x00ff); // isolate vtable method index
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117 __ shll(rax, LogBytesPerWord);
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118 __ addl(rax, rdx); // address of real method pointer.
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119 __ jmp(Address(rax, 0)); // get real method pointer.
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120
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121 __ flush();
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122
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123 *mc_top = (char*)__ pc();
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124 }
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