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1 /*
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2 * Copyright 2003-2006 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_64.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,
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35 oop receiver,
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36 int index);
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37 #endif
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38
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39 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
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40 const int amd64_code_length = VtableStub::pd_code_size_limit(true);
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41 VtableStub* s = new(amd64_code_length) VtableStub(true, vtable_index);
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42 ResourceMark rm;
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43 CodeBuffer cb(s->entry_point(), amd64_code_length);
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44 MacroAssembler* masm = new MacroAssembler(&cb);
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45
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46 #ifndef PRODUCT
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47 if (CountCompiledCalls) {
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48 __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
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49 }
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50 #endif
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51
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52 // get receiver (need to skip return address on top of stack)
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53 assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0");
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54
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55 // Free registers (non-args) are rax, rbx
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56
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57 // get receiver klass
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58 address npe_addr = __ pc();
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59 __ movq(rax, Address(j_rarg0, oopDesc::klass_offset_in_bytes()));
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60
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61 // compute entry offset (in words)
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62 int entry_offset =
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63 instanceKlass::vtable_start_offset() + vtable_index * vtableEntry::size();
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64
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65 #ifndef PRODUCT
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66 if (DebugVtables) {
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67 Label L;
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68 // check offset vs vtable length
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69 __ cmpl(Address(rax, instanceKlass::vtable_length_offset() * wordSize),
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70 vtable_index * vtableEntry::size());
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71 __ jcc(Assembler::greater, L);
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72 __ movl(rbx, vtable_index);
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73 __ call_VM(noreg,
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74 CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), j_rarg0, rbx);
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75 __ bind(L);
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76 }
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77 #endif // PRODUCT
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78
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79 // load methodOop and target address
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80 const Register method = rbx;
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81
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82 __ movq(method, Address(rax,
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83 entry_offset * wordSize +
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84 vtableEntry::method_offset_in_bytes()));
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85 if (DebugVtables) {
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86 Label L;
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87 __ cmpq(method, (int)NULL);
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88 __ jcc(Assembler::equal, L);
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89 __ cmpq(Address(method, methodOopDesc::from_compiled_offset()), (int)NULL_WORD);
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90 __ jcc(Assembler::notZero, L);
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91 __ stop("Vtable entry is NULL");
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92 __ bind(L);
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93 }
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94 // rax: receiver klass
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95 // rbx: methodOop
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96 // rcx: receiver
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97 address ame_addr = __ pc();
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98 __ jmp( Address(rbx, methodOopDesc::from_compiled_offset()));
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99
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100 __ flush();
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101 s->set_exception_points(npe_addr, ame_addr);
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102 return s;
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103 }
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104
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105
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106 VtableStub* VtableStubs::create_itable_stub(int vtable_index) {
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107 // Note well: pd_code_size_limit is the absolute minimum we can get
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108 // away with. If you add code here, bump the code stub size
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109 // returned by pd_code_size_limit!
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110 const int amd64_code_length = VtableStub::pd_code_size_limit(false);
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111 VtableStub* s = new(amd64_code_length) VtableStub(false, vtable_index);
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112 ResourceMark rm;
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113 CodeBuffer cb(s->entry_point(), amd64_code_length);
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114 MacroAssembler* masm = new MacroAssembler(&cb);
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115
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116 #ifndef PRODUCT
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117 if (CountCompiledCalls) {
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118 __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
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119 }
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120 #endif
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121
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122 // Entry arguments:
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123 // rax: Interface
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124 // j_rarg0: Receiver
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125
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126 // Free registers (non-args) are rax (interface), rbx
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127
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128 // get receiver (need to skip return address on top of stack)
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129
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130 assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0");
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131 // get receiver klass (also an implicit null-check)
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132 address npe_addr = __ pc();
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133
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134 __ movq(rbx, Address(j_rarg0, oopDesc::klass_offset_in_bytes()));
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135
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136 // If we take a trap while this arg is on the stack we will not
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137 // be able to walk the stack properly. This is not an issue except
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138 // when there are mistakes in this assembly code that could generate
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139 // a spurious fault. Ask me how I know...
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140
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141 __ pushq(j_rarg1); // Most registers are in use, so save one
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142
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143 // compute itable entry offset (in words)
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144 const int base = instanceKlass::vtable_start_offset() * wordSize;
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145 assert(vtableEntry::size() * wordSize == 8,
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146 "adjust the scaling in the code below");
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147 // Get length of vtable
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148 __ movl(j_rarg1,
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149 Address(rbx, instanceKlass::vtable_length_offset() * wordSize));
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150 __ leaq(rbx, Address(rbx, j_rarg1, Address::times_8, base));
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151
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152 if (HeapWordsPerLong > 1) {
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153 // Round up to align_object_offset boundary
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154 __ round_to_q(rbx, BytesPerLong);
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155 }
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156 Label hit, next, entry;
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157
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158 __ jmpb(entry);
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159
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160 __ bind(next);
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161 __ addq(rbx, itableOffsetEntry::size() * wordSize);
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162
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163 __ bind(entry);
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164
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165 #ifdef ASSERT
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166 // Check that the entry is non-null
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167 if (DebugVtables) {
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168 Label L;
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169 __ pushq(rbx);
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170 __ movq(rbx, Address(rbx, itableOffsetEntry::interface_offset_in_bytes()));
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171 __ testq(rbx, rbx);
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172 __ jcc(Assembler::notZero, L);
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173 __ stop("null entry point found in itable's offset table");
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174 __ bind(L);
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175 __ popq(rbx);
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176 }
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177 #endif
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178
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179 __ cmpq(rax, Address(rbx, itableOffsetEntry::interface_offset_in_bytes()));
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180 __ jcc(Assembler::notEqual, next);
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181
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182 // We found a hit, move offset into j_rarg1
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183 __ movl(j_rarg1, Address(rbx, itableOffsetEntry::offset_offset_in_bytes()));
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184
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185 // Compute itableMethodEntry
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186 const int method_offset =
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187 (itableMethodEntry::size() * wordSize * vtable_index) +
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188 itableMethodEntry::method_offset_in_bytes();
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189
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190 // Get methodOop and entrypoint for compiler
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191
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192 // Get klass pointer again
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193 __ movq(rax, Address(j_rarg0, oopDesc::klass_offset_in_bytes()));
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194
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195 const Register method = rbx;
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196 __ movq(method, Address(rax, j_rarg1, Address::times_1, method_offset));
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197
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198 // Restore saved register, before possible trap.
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199 __ popq(j_rarg1);
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200
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201 // method (rbx): methodOop
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202 // j_rarg0: receiver
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203
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204
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205 #ifdef ASSERT
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206 if (DebugVtables) {
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207 Label L2;
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208 __ cmpq(method, (int)NULL);
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209 __ jcc(Assembler::equal, L2);
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210 __ cmpq(Address(method, methodOopDesc::from_compiled_offset()), (int)NULL_WORD);
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211 __ jcc(Assembler::notZero, L2);
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212 __ stop("compiler entrypoint is null");
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213 __ bind(L2);
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214 }
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215 #endif // ASSERT
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216
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217 // rbx: methodOop
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218 // j_rarg0: receiver
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219 address ame_addr = __ pc();
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220 __ jmp(Address(method, methodOopDesc::from_compiled_offset()));
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221
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222 __ flush();
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223 s->set_exception_points(npe_addr, ame_addr);
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224 return s;
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225 }
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226
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227 int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
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228 if (is_vtable_stub) {
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229 // Vtable stub size
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230 return (DebugVtables ? 512 : 24) + (CountCompiledCalls ? 13 : 0);
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231 } else {
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232 // Itable stub size
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233 return (DebugVtables ? 636 : 64) + (CountCompiledCalls ? 13 : 0);
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234 }
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235 }
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236
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237 int VtableStub::pd_code_alignment() {
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238 return wordSize;
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239 }
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