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annotate src/share/vm/code/icBuffer.cpp @ 21205:f34ae5c01864

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include reexecute, rethrow_exception and return_oop info when disassembling debug scopes
author Doug Simon <doug.simon@oracle.com>
date Mon, 04 May 2015 10:39:12 +0200
parents 52b4284cb496
children
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1 /*
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2 * Copyright (c) 1997, 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 "code/codeCache.hpp"
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27 #include "code/compiledIC.hpp"
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28 #include "code/icBuffer.hpp"
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29 #include "code/nmethod.hpp"
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30 #include "code/scopeDesc.hpp"
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31 #include "gc_interface/collectedHeap.inline.hpp"
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32 #include "interpreter/interpreter.hpp"
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33 #include "interpreter/linkResolver.hpp"
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34 #include "memory/resourceArea.hpp"
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35 #include "memory/universe.inline.hpp"
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36 #include "oops/method.hpp"
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37 #include "oops/oop.inline.hpp"
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38 #include "oops/oop.inline2.hpp"
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39 #include "runtime/mutexLocker.hpp"
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40 #include "runtime/stubRoutines.hpp"
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41
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42 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
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43
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44 DEF_STUB_INTERFACE(ICStub);
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45
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46 StubQueue* InlineCacheBuffer::_buffer = NULL;
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47 ICStub* InlineCacheBuffer::_next_stub = NULL;
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48
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49 CompiledICHolder* InlineCacheBuffer::_pending_released = NULL;
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50 int InlineCacheBuffer::_pending_count = 0;
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51
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52 void ICStub::finalize() {
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53 if (!is_empty()) {
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54 ResourceMark rm;
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55 CompiledIC *ic = CompiledIC_at(CodeCache::find_nmethod(ic_site()), ic_site());
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56 assert(CodeCache::find_nmethod(ic->instruction_address()) != NULL, "inline cache in non-nmethod?");
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57
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58 assert(this == ICStub_from_destination_address(ic->stub_address()), "wrong owner of ic buffer");
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59 ic->set_ic_destination_and_value(destination(), cached_value());
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60 }
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61 }
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62
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63
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64 address ICStub::destination() const {
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65 return InlineCacheBuffer::ic_buffer_entry_point(code_begin());
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66 }
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67
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68 void* ICStub::cached_value() const {
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69 return InlineCacheBuffer::ic_buffer_cached_value(code_begin());
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70 }
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71
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72
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73 void ICStub::set_stub(CompiledIC *ic, void* cached_val, address dest_addr) {
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74 // We cannot store a pointer to the 'ic' object, since it is resource allocated. Instead we
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75 // store the location of the inline cache. Then we have enough information recreate the CompiledIC
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76 // object when we need to remove the stub.
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77 _ic_site = ic->instruction_address();
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78
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79 // Assemble new stub
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80 InlineCacheBuffer::assemble_ic_buffer_code(code_begin(), cached_val, dest_addr);
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81 assert(destination() == dest_addr, "can recover destination");
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82 assert(cached_value() == cached_val, "can recover destination");
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83 }
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84
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85
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86 void ICStub::clear() {
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87 if (CompiledIC::is_icholder_entry(destination())) {
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88 InlineCacheBuffer::queue_for_release((CompiledICHolder*)cached_value());
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89 }
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90 _ic_site = NULL;
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91 }
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92
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93
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94 #ifndef PRODUCT
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95 // anybody calling to this stub will trap
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96
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97 void ICStub::verify() {
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98 }
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99
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100 void ICStub::print() {
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101 tty->print_cr("ICStub: site: " INTPTR_FORMAT, _ic_site);
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102 }
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103 #endif
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104
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105 //-----------------------------------------------------------------------------------------------
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106 // Implementation of InlineCacheBuffer
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107
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108 void InlineCacheBuffer::init_next_stub() {
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109 ICStub* ic_stub = (ICStub*)buffer()->request_committed (ic_stub_code_size());
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110 assert (ic_stub != NULL, "no room for a single stub");
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111 set_next_stub(ic_stub);
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112 }
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113
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114 void InlineCacheBuffer::initialize() {
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115 if (_buffer != NULL) return; // already initialized
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116 _buffer = new StubQueue(new ICStubInterface, 10*K, InlineCacheBuffer_lock, "InlineCacheBuffer");
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117 assert (_buffer != NULL, "cannot allocate InlineCacheBuffer");
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118 init_next_stub();
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119 }
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120
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121
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122 ICStub* InlineCacheBuffer::new_ic_stub() {
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123 while (true) {
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124 ICStub* ic_stub = (ICStub*)buffer()->request_committed(ic_stub_code_size());
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125 if (ic_stub != NULL) {
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126 return ic_stub;
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127 }
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128 // we ran out of inline cache buffer space; must enter safepoint.
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129 // We do this by forcing a safepoint
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130 EXCEPTION_MARK;
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131
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132 VM_ForceSafepoint vfs;
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133 VMThread::execute(&vfs);
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134 // We could potential get an async. exception at this point.
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135 // In that case we will rethrow it to ourselvs.
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136 if (HAS_PENDING_EXCEPTION) {
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137 oop exception = PENDING_EXCEPTION;
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138 CLEAR_PENDING_EXCEPTION;
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139 Thread::send_async_exception(JavaThread::current()->threadObj(), exception);
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140 }
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141 }
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142 ShouldNotReachHere();
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143 return NULL;
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144 }
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145
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146
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147 void InlineCacheBuffer::update_inline_caches() {
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148 if (buffer()->number_of_stubs() > 1) {
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149 if (TraceICBuffer) {
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150 tty->print_cr("[updating inline caches with %d stubs]", buffer()->number_of_stubs());
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151 }
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152 buffer()->remove_all();
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153 init_next_stub();
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154 }
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155 release_pending_icholders();
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156 }
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157
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158
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159 bool InlineCacheBuffer::contains(address instruction_address) {
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160 return buffer()->contains(instruction_address);
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161 }
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162
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163
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164 bool InlineCacheBuffer::is_empty() {
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165 return buffer()->number_of_stubs() == 1; // always has sentinel
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166 }
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167
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168
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169 void InlineCacheBuffer_init() {
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170 InlineCacheBuffer::initialize();
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171 }
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172
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173
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174 void InlineCacheBuffer::create_transition_stub(CompiledIC *ic, void* cached_value, address entry) {
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175 assert(!SafepointSynchronize::is_at_safepoint(), "should not be called during a safepoint");
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176 assert (CompiledIC_lock->is_locked(), "");
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177 if (TraceICBuffer) {
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178 tty->print_cr(" create transition stub for " INTPTR_FORMAT " destination " INTPTR_FORMAT " cached value " INTPTR_FORMAT,
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179 ic->instruction_address(), entry, cached_value);
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180 }
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181
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182 // If an transition stub is already associate with the inline cache, then we remove the association.
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183 if (ic->is_in_transition_state()) {
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184 ICStub* old_stub = ICStub_from_destination_address(ic->stub_address());
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185 old_stub->clear();
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186 }
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187
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188 // allocate and initialize new "out-of-line" inline-cache
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189 ICStub* ic_stub = get_next_stub();
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190 ic_stub->set_stub(ic, cached_value, entry);
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191
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192 // Update inline cache in nmethod to point to new "out-of-line" allocated inline cache
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193 ic->set_ic_destination(ic_stub);
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194
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195 set_next_stub(new_ic_stub()); // can cause safepoint synchronization
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196 }
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197
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198
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199 address InlineCacheBuffer::ic_destination_for(CompiledIC *ic) {
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200 ICStub* stub = ICStub_from_destination_address(ic->stub_address());
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201 return stub->destination();
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202 }
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203
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204
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205 void* InlineCacheBuffer::cached_value_for(CompiledIC *ic) {
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206 ICStub* stub = ICStub_from_destination_address(ic->stub_address());
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207 return stub->cached_value();
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208 }
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209
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210
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211 // Free CompiledICHolder*s that are no longer in use
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212 void InlineCacheBuffer::release_pending_icholders() {
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213 assert(SafepointSynchronize::is_at_safepoint(), "should only be called during a safepoint");
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214 CompiledICHolder* holder = _pending_released;
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215 _pending_released = NULL;
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216 while (holder != NULL) {
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217 CompiledICHolder* next = holder->next();
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218 delete holder;
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219 holder = next;
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220 _pending_count--;
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221 }
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222 assert(_pending_count == 0, "wrong count");
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223 }
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224
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225 // Enqueue this icholder for release during the next safepoint. It's
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226 // not safe to free them until them since they might be visible to
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227 // another thread.
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228 void InlineCacheBuffer::queue_for_release(CompiledICHolder* icholder) {
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229 MutexLockerEx mex(InlineCacheBuffer_lock);
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230 icholder->set_next(_pending_released);
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231 _pending_released = icholder;
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232 _pending_count++;
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233 if (TraceICBuffer) {
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234 tty->print_cr("enqueueing icholder " INTPTR_FORMAT " to be freed", icholder);
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235 }
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236 }