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1 /*
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2 * Copyright 1997-2006 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/_vtableStubs_x86_32.cpp.incl"
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27
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28 // machine-dependent part of VtableStubs: create VtableStub of correct size and
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29 // initialize its code
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30
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31 #define __ masm->
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32
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33 #ifndef PRODUCT
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34 extern "C" void bad_compiled_vtable_index(JavaThread* thread, oop receiver, int index);
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35 #endif
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36
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37 // used by compiler only; may use only caller saved registers rax, rbx, rcx.
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38 // rdx holds first int arg, rsi, rdi, rbp are callee-save & must be preserved.
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39 // Leave receiver in rcx; required behavior when +OptoArgsInRegisters
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40 // is modifed to put first oop in rcx.
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41 //
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42 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
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43 const int i486_code_length = VtableStub::pd_code_size_limit(true);
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44 VtableStub* s = new(i486_code_length) VtableStub(true, vtable_index);
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45 ResourceMark rm;
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46 CodeBuffer cb(s->entry_point(), i486_code_length);
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47 MacroAssembler* masm = new MacroAssembler(&cb);
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48
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49 #ifndef PRODUCT
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50
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51 if (CountCompiledCalls) {
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52 __ increment(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
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53 }
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54 #endif /* PRODUCT */
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55
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56 // get receiver (need to skip return address on top of stack)
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57 assert(VtableStub::receiver_location() == rcx->as_VMReg(), "receiver expected in rcx");
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58
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59 // get receiver klass
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60 address npe_addr = __ pc();
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61 __ movl(rax, Address(rcx, oopDesc::klass_offset_in_bytes()));
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62 // compute entry offset (in words)
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63 int entry_offset = instanceKlass::vtable_start_offset() + vtable_index*vtableEntry::size();
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64 #ifndef PRODUCT
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65 if (DebugVtables) {
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66 Label L;
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67 // check offset vs vtable length
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68 __ cmpl(Address(rax, instanceKlass::vtable_length_offset()*wordSize), vtable_index*vtableEntry::size());
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69 __ jcc(Assembler::greater, L);
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70 __ movl(rbx, vtable_index);
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71 __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), rcx, rbx);
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72 __ bind(L);
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73 }
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74 #endif // PRODUCT
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75
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76 const Register method = rbx;
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77
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78 // load methodOop and target address
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79 __ movl(method, Address(rax, entry_offset*wordSize + vtableEntry::method_offset_in_bytes()));
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80 if (DebugVtables) {
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81 Label L;
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82 __ cmpl(method, NULL_WORD);
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83 __ jcc(Assembler::equal, L);
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84 __ cmpl(Address(method, methodOopDesc::from_compiled_offset()), NULL_WORD);
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85 __ jcc(Assembler::notZero, L);
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86 __ stop("Vtable entry is NULL");
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87 __ bind(L);
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88 }
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89
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90 // rax,: receiver klass
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91 // method (rbx): methodOop
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92 // rcx: receiver
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93 address ame_addr = __ pc();
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94 __ jmp( Address(method, methodOopDesc::from_compiled_offset()));
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95
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96 masm->flush();
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97 s->set_exception_points(npe_addr, ame_addr);
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98 return s;
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99 }
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100
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101
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102 VtableStub* VtableStubs::create_itable_stub(int vtable_index) {
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103 // Note well: pd_code_size_limit is the absolute minimum we can get away with. If you
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104 // add code here, bump the code stub size returned by pd_code_size_limit!
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105 const int i486_code_length = VtableStub::pd_code_size_limit(false);
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106 VtableStub* s = new(i486_code_length) VtableStub(false, vtable_index);
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107 ResourceMark rm;
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108 CodeBuffer cb(s->entry_point(), i486_code_length);
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109 MacroAssembler* masm = new MacroAssembler(&cb);
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110
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111 // Entry arguments:
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112 // rax,: Interface
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113 // rcx: Receiver
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114
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115 #ifndef PRODUCT
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116 if (CountCompiledCalls) {
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117 __ increment(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
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118 }
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119 #endif /* PRODUCT */
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120 // get receiver (need to skip return address on top of stack)
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121
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122 assert(VtableStub::receiver_location() == rcx->as_VMReg(), "receiver expected in rcx");
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123
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124 // get receiver klass (also an implicit null-check)
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125 address npe_addr = __ pc();
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126 __ movl(rbx, Address(rcx, oopDesc::klass_offset_in_bytes()));
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127
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128 __ movl(rsi, rbx); // Save klass in free register
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129 // Most registers are in use, so save a few
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130 __ pushl(rdx);
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131 // compute itable entry offset (in words)
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132 const int base = instanceKlass::vtable_start_offset() * wordSize;
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133 assert(vtableEntry::size() * wordSize == 4, "adjust the scaling in the code below");
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134 __ movl(rdx, Address(rbx, instanceKlass::vtable_length_offset() * wordSize)); // Get length of vtable
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135 __ leal(rbx, Address(rbx, rdx, Address::times_4, base));
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136 if (HeapWordsPerLong > 1) {
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137 // Round up to align_object_offset boundary
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138 __ round_to(rbx, BytesPerLong);
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139 }
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140
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141 Label hit, next, entry;
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142
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143 __ jmp(entry);
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144
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145 __ bind(next);
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146 __ addl(rbx, itableOffsetEntry::size() * wordSize);
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147
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148 __ bind(entry);
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149
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150 #ifdef ASSERT
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151 // Check that the entry is non-null
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152 if (DebugVtables) {
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153 Label L;
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154 __ pushl(rbx);
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155 __ movl(rbx, Address(rbx, itableOffsetEntry::interface_offset_in_bytes()));
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156 __ testl(rbx, rbx);
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157 __ jcc(Assembler::notZero, L);
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158 __ stop("null entry point found in itable's offset table");
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159 __ bind(L);
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160 __ popl(rbx);
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161 }
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162 #endif
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163 __ cmpl(rax, Address(rbx, itableOffsetEntry::interface_offset_in_bytes()));
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164 __ jcc(Assembler::notEqual, next);
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165
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166 // We found a hit, move offset into rbx,
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167 __ movl(rdx, Address(rbx, itableOffsetEntry::offset_offset_in_bytes()));
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168
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169 // Compute itableMethodEntry.
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170 const int method_offset = (itableMethodEntry::size() * wordSize * vtable_index) + itableMethodEntry::method_offset_in_bytes();
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171
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172 // Get methodOop and entrypoint for compiler
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173 const Register method = rbx;
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174 __ movl(method, Address(rsi, rdx, Address::times_1, method_offset));
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175
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176 // Restore saved register, before possible trap.
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177 __ popl(rdx);
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178
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179 // method (rbx): methodOop
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180 // rcx: receiver
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181
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182 #ifdef ASSERT
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183 if (DebugVtables) {
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184 Label L1;
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185 __ cmpl(method, NULL_WORD);
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186 __ jcc(Assembler::equal, L1);
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187 __ cmpl(Address(method, methodOopDesc::from_compiled_offset()), NULL_WORD);
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188 __ jcc(Assembler::notZero, L1);
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189 __ stop("methodOop is null");
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190 __ bind(L1);
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191 }
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192 #endif // ASSERT
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193
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194 address ame_addr = __ pc();
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195 __ jmp(Address(method, methodOopDesc::from_compiled_offset()));
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196
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197 masm->flush();
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198 s->set_exception_points(npe_addr, ame_addr);
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199 return s;
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200 }
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201
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202
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203
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204 int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
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205 if (is_vtable_stub) {
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206 // Vtable stub size
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207 return (DebugVtables ? 210 : 16) + (CountCompiledCalls ? 6 : 0);
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208 } else {
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209 // Itable stub size
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210 return (DebugVtables ? 140 : 55) + (CountCompiledCalls ? 6 : 0);
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211 }
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212 }
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213
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214 int VtableStub::pd_code_alignment() {
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215 return wordSize;
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216 }
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