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annotate src/cpu/x86/vm/vtableStubs_x86_64.cpp @ 18041:52b4284cb496

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Merge with jdk8u20-b26
author Gilles Duboscq <duboscq@ssw.jku.at>
date Wed, 15 Oct 2014 16:02:50 +0200
parents 89152779163c 78bbf4d43a14
children
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1 /*
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2 * Copyright (c) 2003, 2014, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26 #include "asm/macroAssembler.hpp"
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27 #include "code/vtableStubs.hpp"
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28 #include "interp_masm_x86.hpp"
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29 #include "memory/resourceArea.hpp"
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30 #include "oops/instanceKlass.hpp"
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31 #include "oops/klassVtable.hpp"
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32 #include "runtime/sharedRuntime.hpp"
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33 #include "vmreg_x86.inline.hpp"
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34 #ifdef COMPILER2
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35 #include "opto/runtime.hpp"
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36 #endif
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37
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38 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
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39
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40 // machine-dependent part of VtableStubs: create VtableStub of correct size and
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41 // initialize its code
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42
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43 #define __ masm->
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44
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45 #ifndef PRODUCT
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46 extern "C" void bad_compiled_vtable_index(JavaThread* thread,
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47 oop receiver,
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48 int index);
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49 #endif
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50
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51 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
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52 const int amd64_code_length = VtableStub::pd_code_size_limit(true);
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53 VtableStub* s = new(amd64_code_length) VtableStub(true, vtable_index);
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54 // Can be NULL if there is no free space in the code cache.
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55 if (s == NULL) {
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56 return NULL;
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57 }
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58
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59 ResourceMark rm;
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60 CodeBuffer cb(s->entry_point(), amd64_code_length);
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61 MacroAssembler* masm = new MacroAssembler(&cb);
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62
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63 #ifndef PRODUCT
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64 if (CountCompiledCalls) {
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65 __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
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66 }
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67 #endif
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68
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69 // get receiver (need to skip return address on top of stack)
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70 assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0");
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71
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72 // Free registers (non-args) are rax, rbx
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73
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74 // get receiver klass
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75 address npe_addr = __ pc();
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76 __ load_klass(rax, j_rarg0);
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77
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78 #ifndef PRODUCT
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79 if (DebugVtables) {
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80 Label L;
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81 // check offset vs vtable length
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82 __ cmpl(Address(rax, InstanceKlass::vtable_length_offset() * wordSize),
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83 vtable_index * vtableEntry::size());
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84 __ jcc(Assembler::greater, L);
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85 __ movl(rbx, vtable_index);
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86 __ call_VM(noreg,
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87 CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), j_rarg0, rbx);
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88 __ bind(L);
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89 }
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90 #endif // PRODUCT
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91
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92 // load Method* and target address
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93 const Register method = rbx;
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94
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95 __ lookup_virtual_method(rax, vtable_index, method);
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96
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97 if (DebugVtables) {
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98 Label L;
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99 __ cmpptr(method, (int32_t)NULL_WORD);
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100 __ jcc(Assembler::equal, L);
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101 __ cmpptr(Address(method, Method::from_compiled_offset()), (int32_t)NULL_WORD);
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102 __ jcc(Assembler::notZero, L);
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103 __ stop("Vtable entry is NULL");
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104 __ bind(L);
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105 }
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106 // rax: receiver klass
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107 // rbx: Method*
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108 // rcx: receiver
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109 address ame_addr = __ pc();
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110 __ jmp( Address(rbx, Method::from_compiled_offset()));
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111
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112 __ flush();
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113
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114 if (PrintMiscellaneous && (WizardMode || Verbose)) {
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115 tty->print_cr("vtable #%d at "PTR_FORMAT"[%d] left over: %d",
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116 vtable_index, s->entry_point(),
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117 (int)(s->code_end() - s->entry_point()),
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118 (int)(s->code_end() - __ pc()));
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119 }
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120 guarantee(__ pc() <= s->code_end(), "overflowed buffer");
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121 // shut the door on sizing bugs
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122 int slop = 3; // 32-bit offset is this much larger than an 8-bit one
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123 assert(vtable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset");
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124
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125 s->set_exception_points(npe_addr, ame_addr);
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126 return s;
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127 }
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128
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129
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130 VtableStub* VtableStubs::create_itable_stub(int itable_index) {
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131 // Note well: pd_code_size_limit is the absolute minimum we can get
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132 // away with. If you add code here, bump the code stub size
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133 // returned by pd_code_size_limit!
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134 const int amd64_code_length = VtableStub::pd_code_size_limit(false);
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135 VtableStub* s = new(amd64_code_length) VtableStub(false, itable_index);
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136 // Can be NULL if there is no free space in the code cache.
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137 if (s == NULL) {
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138 return NULL;
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139 }
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140
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141 ResourceMark rm;
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142 CodeBuffer cb(s->entry_point(), amd64_code_length);
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143 MacroAssembler* masm = new MacroAssembler(&cb);
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144
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145 #ifndef PRODUCT
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146 if (CountCompiledCalls) {
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147 __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
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148 }
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149 #endif
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150
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151 // Entry arguments:
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152 // rax: Interface
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153 // j_rarg0: Receiver
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154
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155 // Free registers (non-args) are rax (interface), rbx
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156
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157 // get receiver (need to skip return address on top of stack)
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158
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159 assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0");
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160 // get receiver klass (also an implicit null-check)
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161 address npe_addr = __ pc();
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162
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163 // Most registers are in use; we'll use rax, rbx, r10, r11
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164 // (various calling sequences use r[cd]x, r[sd]i, r[89]; stay away from them)
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165 __ load_klass(r10, j_rarg0);
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166
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167 // If we take a trap while this arg is on the stack we will not
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168 // be able to walk the stack properly. This is not an issue except
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169 // when there are mistakes in this assembly code that could generate
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170 // a spurious fault. Ask me how I know...
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171
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172 const Register method = rbx;
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173 Label throw_icce;
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174
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175 // Get Method* and entrypoint for compiler
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176 __ lookup_interface_method(// inputs: rec. class, interface, itable index
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177 r10, rax, itable_index,
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178 // outputs: method, scan temp. reg
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179 method, r11,
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180 throw_icce);
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181
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182 // method (rbx): Method*
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183 // j_rarg0: receiver
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184
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185 #ifdef ASSERT
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186 if (DebugVtables) {
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187 Label L2;
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188 __ cmpptr(method, (int32_t)NULL_WORD);
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189 __ jcc(Assembler::equal, L2);
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190 __ cmpptr(Address(method, Method::from_compiled_offset()), (int32_t)NULL_WORD);
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191 __ jcc(Assembler::notZero, L2);
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192 __ stop("compiler entrypoint is null");
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193 __ bind(L2);
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194 }
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195 #endif // ASSERT
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196
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197 // rbx: Method*
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198 // j_rarg0: receiver
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199 address ame_addr = __ pc();
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200 __ jmp(Address(method, Method::from_compiled_offset()));
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201
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202 __ bind(throw_icce);
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203 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
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204
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205 __ flush();
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206
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207 if (PrintMiscellaneous && (WizardMode || Verbose)) {
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208 tty->print_cr("itable #%d at "PTR_FORMAT"[%d] left over: %d",
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209 itable_index, s->entry_point(),
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210 (int)(s->code_end() - s->entry_point()),
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211 (int)(s->code_end() - __ pc()));
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212 }
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213 guarantee(__ pc() <= s->code_end(), "overflowed buffer");
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214 // shut the door on sizing bugs
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215 int slop = 3; // 32-bit offset is this much larger than an 8-bit one
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216 assert(itable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset");
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217
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218 s->set_exception_points(npe_addr, ame_addr);
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219 return s;
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220 }
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221
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222 int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
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223 if (is_vtable_stub) {
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224 // Vtable stub size
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225 return (DebugVtables ? 512 : 24) + (CountCompiledCalls ? 13 : 0) +
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226 (UseCompressedClassPointers ? MacroAssembler::instr_size_for_decode_klass_not_null() : 0);
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227 } else {
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228 // Itable stub size
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229 return (DebugVtables ? 512 : 74) + (CountCompiledCalls ? 13 : 0) +
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230 (UseCompressedClassPointers ? MacroAssembler::instr_size_for_decode_klass_not_null() : 0);
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231 }
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232 // In order to tune these parameters, run the JVM with VM options
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233 // +PrintMiscellaneous and +WizardMode to see information about
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234 // actual itable stubs. Look for lines like this:
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235 // itable #1 at 0x5551212[71] left over: 3
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236 // Reduce the constants so that the "left over" number is >=3
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237 // for the common cases.
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238 // Do not aim at a left-over number of zero, because a
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239 // large vtable or itable index (>= 32) will require a 32-bit
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240 // immediate displacement instead of an 8-bit one.
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241 //
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242 // The JVM98 app. _202_jess has a megamorphic interface call.
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243 // The itable code looks like this:
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244 // Decoding VtableStub itbl[1]@12
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245 // mov 0x8(%rsi),%r10
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246 // mov 0x198(%r10),%r11d
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247 // lea 0x218(%r10,%r11,8),%r11
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248 // lea 0x8(%r10),%r10
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249 // mov (%r11),%rbx
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250 // cmp %rbx,%rax
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251 // je success
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252 // loop:
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253 // test %rbx,%rbx
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254 // je throw_icce
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255 // add $0x10,%r11
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256 // mov (%r11),%rbx
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257 // cmp %rbx,%rax
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258 // jne loop
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259 // success:
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260 // mov 0x8(%r11),%r11d
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261 // mov (%r10,%r11,1),%rbx
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262 // jmpq *0x60(%rbx)
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263 // throw_icce:
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264 // jmpq throw_ICCE_entry
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265 }
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266
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267 int VtableStub::pd_code_alignment() {
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268 return wordSize;
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269 }