annotate src/share/vm/code/vtableStubs.cpp @ 14330:9341a9963d36

8025841: JVMTI: "vtable stub" dynamic code notification is misplaced Summary: Generate correct "vtable stub" dynamic code notifications Reviewed-by: sspitsyn, kvn, coleenp Contributed-by: oleg.mazurov@oracle.com
author sspitsyn
date Thu, 06 Feb 2014 20:13:38 -0800
parents 891687731b59
children 4ca6dc0799b6 78bbf4d43a14
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1 /*
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2 * Copyright (c) 1997, 2013, 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 "code/vtableStubs.hpp"
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27 #include "compiler/disassembler.hpp"
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28 #include "memory/allocation.inline.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 "oops/oop.inline.hpp"
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33 #include "prims/forte.hpp"
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34 #include "prims/jvmtiExport.hpp"
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35 #include "runtime/handles.inline.hpp"
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36 #include "runtime/mutexLocker.hpp"
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37 #include "runtime/sharedRuntime.hpp"
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38 #ifdef COMPILER2
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39 #include "opto/matcher.hpp"
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40 #endif
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41
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42 // -----------------------------------------------------------------------------------------
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43 // Implementation of VtableStub
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44
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45 address VtableStub::_chunk = NULL;
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46 address VtableStub::_chunk_end = NULL;
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47 VMReg VtableStub::_receiver_location = VMRegImpl::Bad();
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48
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49
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50 void* VtableStub::operator new(size_t size, int code_size) throw() {
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51 assert(size == sizeof(VtableStub), "mismatched size");
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52 // compute real VtableStub size (rounded to nearest word)
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53 const int real_size = round_to(code_size + sizeof(VtableStub), wordSize);
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54 // malloc them in chunks to minimize header overhead
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55 const int chunk_factor = 32;
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56 if (_chunk == NULL || _chunk + real_size > _chunk_end) {
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57 const int bytes = chunk_factor * real_size + pd_code_alignment();
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58
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59 // There is a dependency on the name of the blob in src/share/vm/prims/jvmtiCodeBlobEvents.cpp
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60 // If changing the name, update the other file accordingly.
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61 BufferBlob* blob = BufferBlob::create("vtable chunks", bytes);
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62 if (blob == NULL) {
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63 return NULL;
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64 }
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65 _chunk = blob->content_begin();
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66 _chunk_end = _chunk + bytes;
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67 Forte::register_stub("vtable stub", _chunk, _chunk_end);
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68 align_chunk();
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69 }
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70 assert(_chunk + real_size <= _chunk_end, "bad allocation");
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71 void* res = _chunk;
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72 _chunk += real_size;
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73 align_chunk();
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74 return res;
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75 }
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76
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77
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78 void VtableStub::print_on(outputStream* st) const {
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79 st->print("vtable stub (index = %d, receiver_location = %d, code = [" INTPTR_FORMAT ", " INTPTR_FORMAT "[)",
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80 index(), receiver_location(), code_begin(), code_end());
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81 }
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82
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83
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84 // -----------------------------------------------------------------------------------------
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85 // Implementation of VtableStubs
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86 //
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87 // For each hash value there's a linked list of vtable stubs (with that
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88 // hash value). Each list is anchored in a little hash _table, indexed
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89 // by that hash value.
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90
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91 VtableStub* VtableStubs::_table[VtableStubs::N];
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92 int VtableStubs::_number_of_vtable_stubs = 0;
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93
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94
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95 void VtableStubs::initialize() {
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96 VtableStub::_receiver_location = SharedRuntime::name_for_receiver();
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97 {
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98 MutexLocker ml(VtableStubs_lock);
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99 assert(_number_of_vtable_stubs == 0, "potential performance bug: VtableStubs initialized more than once");
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100 assert(is_power_of_2(N), "N must be a power of 2");
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101 for (int i = 0; i < N; i++) {
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102 _table[i] = NULL;
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103 }
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104 }
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105 }
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106
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107
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108 address VtableStubs::find_stub(bool is_vtable_stub, int vtable_index) {
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109 assert(vtable_index >= 0, "must be positive");
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110
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111 VtableStub* s = ShareVtableStubs ? lookup(is_vtable_stub, vtable_index) : NULL;
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112 if (s == NULL) {
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113 if (is_vtable_stub) {
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114 s = create_vtable_stub(vtable_index);
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115 } else {
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116 s = create_itable_stub(vtable_index);
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117 }
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118
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119 // Creation of vtable or itable can fail if there is not enough free space in the code cache.
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120 if (s == NULL) {
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121 return NULL;
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122 }
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123
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124 enter(is_vtable_stub, vtable_index, s);
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125 if (PrintAdapterHandlers) {
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126 tty->print_cr("Decoding VtableStub %s[%d]@%d",
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127 is_vtable_stub? "vtbl": "itbl", vtable_index, VtableStub::receiver_location());
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128 Disassembler::decode(s->code_begin(), s->code_end());
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129 }
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130 // Notify JVMTI about this stub. The event will be recorded by the enclosing
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131 // JvmtiDynamicCodeEventCollector and posted when this thread has released
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132 // all locks.
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133 if (JvmtiExport::should_post_dynamic_code_generated()) {
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134 JvmtiExport::post_dynamic_code_generated_while_holding_locks(is_vtable_stub? "vtable stub": "itable stub",
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135 s->code_begin(), s->code_end());
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136 }
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137 }
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138 return s->entry_point();
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139 }
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140
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141
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142 inline uint VtableStubs::hash(bool is_vtable_stub, int vtable_index){
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143 // Assumption: receiver_location < 4 in most cases.
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144 int hash = ((vtable_index << 2) ^ VtableStub::receiver_location()->value()) + vtable_index;
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145 return (is_vtable_stub ? ~hash : hash) & mask;
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146 }
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147
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148
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149 VtableStub* VtableStubs::lookup(bool is_vtable_stub, int vtable_index) {
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150 MutexLocker ml(VtableStubs_lock);
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151 unsigned hash = VtableStubs::hash(is_vtable_stub, vtable_index);
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152 VtableStub* s = _table[hash];
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153 while( s && !s->matches(is_vtable_stub, vtable_index)) s = s->next();
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154 return s;
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155 }
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156
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157
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158 void VtableStubs::enter(bool is_vtable_stub, int vtable_index, VtableStub* s) {
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159 MutexLocker ml(VtableStubs_lock);
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160 assert(s->matches(is_vtable_stub, vtable_index), "bad vtable stub");
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161 unsigned int h = VtableStubs::hash(is_vtable_stub, vtable_index);
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162 // enter s at the beginning of the corresponding list
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163 s->set_next(_table[h]);
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164 _table[h] = s;
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165 _number_of_vtable_stubs++;
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166 }
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167
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168
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169 bool VtableStubs::is_entry_point(address pc) {
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170 MutexLocker ml(VtableStubs_lock);
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171 VtableStub* stub = (VtableStub*)(pc - VtableStub::entry_offset());
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172 uint hash = VtableStubs::hash(stub->is_vtable_stub(), stub->index());
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173 VtableStub* s;
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174 for (s = _table[hash]; s != NULL && s != stub; s = s->next()) {}
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175 return s == stub;
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176 }
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177
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178
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179 bool VtableStubs::contains(address pc) {
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180 // simple solution for now - we may want to use
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181 // a faster way if this function is called often
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182 return stub_containing(pc) != NULL;
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183 }
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184
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185
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186 VtableStub* VtableStubs::stub_containing(address pc) {
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187 // Note: No locking needed since any change to the data structure
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188 // happens with an atomic store into it (we don't care about
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189 // consistency with the _number_of_vtable_stubs counter).
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190 for (int i = 0; i < N; i++) {
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191 for (VtableStub* s = _table[i]; s != NULL; s = s->next()) {
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192 if (s->contains(pc)) return s;
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193 }
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194 }
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195 return NULL;
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196 }
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197
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198 void vtableStubs_init() {
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199 VtableStubs::initialize();
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200 }
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201
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202 void VtableStubs::vtable_stub_do(void f(VtableStub*)) {
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203 for (int i = 0; i < N; i++) {
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204 for (VtableStub* s = _table[i]; s != NULL; s = s->next()) {
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205 f(s);
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206 }
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207 }
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208 }
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209
0
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210
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211 //-----------------------------------------------------------------------------------------------------
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212 // Non-product code
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213 #ifndef PRODUCT
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214
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215 extern "C" void bad_compiled_vtable_index(JavaThread* thread, oop receiver, int index) {
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216 ResourceMark rm;
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217 HandleMark hm;
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218 Klass* klass = receiver->klass();
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219 InstanceKlass* ik = InstanceKlass::cast(klass);
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220 klassVtable* vt = ik->vtable();
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221 ik->print();
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222 fatal(err_msg("bad compiled vtable dispatch: receiver " INTPTR_FORMAT ", "
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223 "index %d (vtable length %d)",
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224 (address)receiver, index, vt->length()));
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225 }
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226
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227 #endif // Product