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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/_compiledIC.cpp.incl" |
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27 |
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28 |
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29 // Every time a compiled IC is changed or its type is being accessed, |
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30 // either the CompiledIC_lock must be set or we must be at a safe point. |
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31 |
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32 //----------------------------------------------------------------------------- |
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33 // Low-level access to an inline cache. Private, since they might not be |
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34 // MT-safe to use. |
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35 |
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36 void CompiledIC::set_cached_oop(oop cache) { |
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37 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
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38 assert (!is_optimized(), "an optimized virtual call does not have a cached oop"); |
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39 assert (cache == NULL || cache != badOop, "invalid oop"); |
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40 |
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41 if (TraceCompiledIC) { |
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42 tty->print(" "); |
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43 print_compiled_ic(); |
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44 tty->print_cr(" changing oop to " INTPTR_FORMAT, (address)cache); |
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45 } |
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46 |
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47 if (cache == NULL) cache = (oop)Universe::non_oop_word(); |
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48 |
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49 *_oop_addr = cache; |
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50 // fix up the relocations |
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51 RelocIterator iter = _oops; |
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52 while (iter.next()) { |
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53 if (iter.type() == relocInfo::oop_type) { |
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54 oop_Relocation* r = iter.oop_reloc(); |
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55 if (r->oop_addr() == _oop_addr) |
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56 r->fix_oop_relocation(); |
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57 } |
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58 } |
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59 return; |
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60 } |
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61 |
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62 |
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63 oop CompiledIC::cached_oop() const { |
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64 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
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65 assert (!is_optimized(), "an optimized virtual call does not have a cached oop"); |
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66 |
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67 if (!is_in_transition_state()) { |
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68 oop data = *_oop_addr; |
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69 // If we let the oop value here be initialized to zero... |
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70 assert(data != NULL || Universe::non_oop_word() == NULL, |
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71 "no raw nulls in CompiledIC oops, because of patching races"); |
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72 return (data == (oop)Universe::non_oop_word()) ? (oop)NULL : data; |
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73 } else { |
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74 return InlineCacheBuffer::cached_oop_for((CompiledIC *)this); |
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75 } |
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76 } |
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77 |
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78 |
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79 void CompiledIC::set_ic_destination(address entry_point) { |
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80 assert(entry_point != NULL, "must set legal entry point"); |
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81 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
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82 if (TraceCompiledIC) { |
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83 tty->print(" "); |
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84 print_compiled_ic(); |
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85 tty->print_cr(" changing destination to " INTPTR_FORMAT, entry_point); |
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86 } |
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87 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); |
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88 #ifdef ASSERT |
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89 CodeBlob* cb = CodeCache::find_blob_unsafe(_ic_call); |
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90 assert(cb != NULL && cb->is_nmethod(), "must be nmethod"); |
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91 #endif |
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92 _ic_call->set_destination_mt_safe(entry_point); |
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93 } |
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94 |
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95 |
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96 address CompiledIC::ic_destination() const { |
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97 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
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98 if (!is_in_transition_state()) { |
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99 return _ic_call->destination(); |
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100 } else { |
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101 return InlineCacheBuffer::ic_destination_for((CompiledIC *)this); |
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102 } |
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103 } |
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104 |
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105 |
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106 bool CompiledIC::is_in_transition_state() const { |
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107 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
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108 return InlineCacheBuffer::contains(_ic_call->destination()); |
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109 } |
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110 |
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111 |
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112 // Returns native address of 'call' instruction in inline-cache. Used by |
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113 // the InlineCacheBuffer when it needs to find the stub. |
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114 address CompiledIC::stub_address() const { |
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115 assert(is_in_transition_state(), "should only be called when we are in a transition state"); |
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116 return _ic_call->destination(); |
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117 } |
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118 |
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119 |
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120 //----------------------------------------------------------------------------- |
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121 // High-level access to an inline cache. Guaranteed to be MT-safe. |
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122 |
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123 |
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124 void CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS) { |
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125 methodHandle method = call_info->selected_method(); |
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126 bool is_invoke_interface = (bytecode == Bytecodes::_invokeinterface && !call_info->has_vtable_index()); |
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127 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
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128 assert(method->is_oop(), "cannot be NULL and must be oop"); |
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129 assert(!is_optimized(), "cannot set an optimized virtual call to megamorphic"); |
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130 assert(is_call_to_compiled() || is_call_to_interpreted(), "going directly to megamorphic?"); |
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131 |
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132 address entry; |
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133 if (is_invoke_interface) { |
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134 int index = klassItable::compute_itable_index(call_info->resolved_method()()); |
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135 entry = VtableStubs::create_stub(false, index, method()); |
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136 assert(entry != NULL, "entry not computed"); |
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137 klassOop k = call_info->resolved_method()->method_holder(); |
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138 assert(Klass::cast(k)->is_interface(), "sanity check"); |
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139 InlineCacheBuffer::create_transition_stub(this, k, entry); |
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140 } else { |
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141 // Can be different than method->vtable_index(), due to package-private etc. |
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142 int vtable_index = call_info->vtable_index(); |
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143 entry = VtableStubs::create_stub(true, vtable_index, method()); |
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144 InlineCacheBuffer::create_transition_stub(this, method(), entry); |
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145 } |
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146 |
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147 if (TraceICs) { |
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148 ResourceMark rm; |
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149 tty->print_cr ("IC@" INTPTR_FORMAT ": to megamorphic %s entry: " INTPTR_FORMAT, |
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150 instruction_address(), method->print_value_string(), entry); |
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151 } |
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152 |
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153 Events::log("compiledIC " INTPTR_FORMAT " --> megamorphic " INTPTR_FORMAT, this, (address)method()); |
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154 // We can't check this anymore. With lazy deopt we could have already |
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155 // cleaned this IC entry before we even return. This is possible if |
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156 // we ran out of space in the inline cache buffer trying to do the |
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157 // set_next and we safepointed to free up space. This is a benign |
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158 // race because the IC entry was complete when we safepointed so |
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159 // cleaning it immediately is harmless. |
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160 // assert(is_megamorphic(), "sanity check"); |
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161 } |
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162 |
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163 |
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164 // true if destination is megamorphic stub |
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165 bool CompiledIC::is_megamorphic() const { |
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166 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
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167 assert(!is_optimized(), "an optimized call cannot be megamorphic"); |
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168 |
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169 // Cannot rely on cached_oop. It is either an interface or a method. |
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170 return VtableStubs::is_entry_point(ic_destination()); |
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171 } |
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172 |
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173 bool CompiledIC::is_call_to_compiled() const { |
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174 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
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175 |
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176 // Use unsafe, since an inline cache might point to a zombie method. However, the zombie |
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177 // method is guaranteed to still exist, since we only remove methods after all inline caches |
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178 // has been cleaned up |
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179 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination()); |
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180 bool is_monomorphic = (cb != NULL && cb->is_nmethod()); |
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181 // Check that the cached_oop is a klass for non-optimized monomorphic calls |
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182 // This assertion is invalid for compiler1: a call that does not look optimized (no static stub) can be used |
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183 // for calling directly to vep without using the inline cache (i.e., cached_oop == NULL) |
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184 #ifdef ASSERT |
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185 #ifdef TIERED |
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186 CodeBlob* caller = CodeCache::find_blob_unsafe(instruction_address()); |
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187 bool is_c1_method = caller->is_compiled_by_c1(); |
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188 #else |
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189 #ifdef COMPILER1 |
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190 bool is_c1_method = true; |
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191 #else |
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192 bool is_c1_method = false; |
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193 #endif // COMPILER1 |
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194 #endif // TIERED |
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195 assert( is_c1_method || |
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196 !is_monomorphic || |
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197 is_optimized() || |
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198 (cached_oop() != NULL && cached_oop()->is_klass()), "sanity check"); |
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199 #endif // ASSERT |
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200 return is_monomorphic; |
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201 } |
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202 |
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203 |
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204 bool CompiledIC::is_call_to_interpreted() const { |
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205 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
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206 // Call to interpreter if destination is either calling to a stub (if it |
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207 // is optimized), or calling to an I2C blob |
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208 bool is_call_to_interpreted = false; |
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209 if (!is_optimized()) { |
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210 // must use unsafe because the destination can be a zombie (and we're cleaning) |
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211 // and the print_compiled_ic code wants to know if site (in the non-zombie) |
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212 // is to the interpreter. |
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213 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination()); |
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214 is_call_to_interpreted = (cb != NULL && cb->is_adapter_blob()); |
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215 assert(!is_call_to_interpreted || (cached_oop() != NULL && cached_oop()->is_compiledICHolder()), "sanity check"); |
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216 } else { |
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217 // Check if we are calling into our own codeblob (i.e., to a stub) |
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218 CodeBlob* cb = CodeCache::find_blob(_ic_call->instruction_address()); |
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219 address dest = ic_destination(); |
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220 #ifdef ASSERT |
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221 { |
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222 CodeBlob* db = CodeCache::find_blob_unsafe(dest); |
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223 assert(!db->is_adapter_blob(), "must use stub!"); |
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224 } |
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225 #endif /* ASSERT */ |
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226 is_call_to_interpreted = cb->contains(dest); |
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227 } |
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228 return is_call_to_interpreted; |
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229 } |
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230 |
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231 |
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232 void CompiledIC::set_to_clean() { |
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233 assert(SafepointSynchronize::is_at_safepoint() || CompiledIC_lock->is_locked() , "MT-unsafe call"); |
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234 if (TraceInlineCacheClearing || TraceICs) { |
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235 tty->print_cr("IC@" INTPTR_FORMAT ": set to clean", instruction_address()); |
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236 print(); |
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237 } |
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238 |
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239 address entry; |
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240 if (is_optimized()) { |
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241 entry = SharedRuntime::get_resolve_opt_virtual_call_stub(); |
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242 } else { |
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243 entry = SharedRuntime::get_resolve_virtual_call_stub(); |
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244 } |
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245 |
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246 // A zombie transition will always be safe, since the oop has already been set to NULL, so |
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247 // we only need to patch the destination |
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248 bool safe_transition = is_optimized() || SafepointSynchronize::is_at_safepoint(); |
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249 |
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250 if (safe_transition) { |
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251 if (!is_optimized()) set_cached_oop(NULL); |
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252 // Kill any leftover stub we might have too |
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253 if (is_in_transition_state()) { |
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254 ICStub* old_stub = ICStub_from_destination_address(stub_address()); |
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255 old_stub->clear(); |
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256 } |
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257 set_ic_destination(entry); |
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258 } else { |
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259 // Unsafe transition - create stub. |
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260 InlineCacheBuffer::create_transition_stub(this, NULL, entry); |
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261 } |
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262 // We can't check this anymore. With lazy deopt we could have already |
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263 // cleaned this IC entry before we even return. This is possible if |
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264 // we ran out of space in the inline cache buffer trying to do the |
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265 // set_next and we safepointed to free up space. This is a benign |
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266 // race because the IC entry was complete when we safepointed so |
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267 // cleaning it immediately is harmless. |
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268 // assert(is_clean(), "sanity check"); |
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269 } |
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270 |
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271 |
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272 bool CompiledIC::is_clean() const { |
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273 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
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274 bool is_clean = false; |
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275 address dest = ic_destination(); |
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276 is_clean = dest == SharedRuntime::get_resolve_opt_virtual_call_stub() || |
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277 dest == SharedRuntime::get_resolve_virtual_call_stub(); |
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278 assert(!is_clean || is_optimized() || cached_oop() == NULL, "sanity check"); |
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279 return is_clean; |
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280 } |
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281 |
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282 |
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283 void CompiledIC::set_to_monomorphic(const CompiledICInfo& info) { |
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284 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
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285 // Updating a cache to the wrong entry can cause bugs that are very hard |
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286 // to track down - if cache entry gets invalid - we just clean it. In |
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287 // this way it is always the same code path that is responsible for |
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288 // updating and resolving an inline cache |
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289 // |
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290 // The above is no longer true. SharedRuntime::fixup_callers_callsite will change optimized |
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291 // callsites. In addition ic_miss code will update a site to monomorphic if it determines |
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292 // that an monomorphic call to the interpreter can now be monomorphic to compiled code. |
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293 // |
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294 // In both of these cases the only thing being modifed is the jump/call target and these |
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295 // transitions are mt_safe |
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296 |
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297 Thread *thread = Thread::current(); |
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298 if (info._to_interpreter) { |
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299 // Call to interpreter |
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300 if (info.is_optimized() && is_optimized()) { |
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301 assert(is_clean(), "unsafe IC path"); |
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302 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); |
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303 // the call analysis (callee structure) specifies that the call is optimized |
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304 // (either because of CHA or the static target is final) |
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305 // At code generation time, this call has been emitted as static call |
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306 // Call via stub |
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307 assert(info.cached_oop().not_null() && info.cached_oop()->is_method(), "sanity check"); |
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308 CompiledStaticCall* csc = compiledStaticCall_at(instruction_address()); |
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309 methodHandle method (thread, (methodOop)info.cached_oop()()); |
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310 csc->set_to_interpreted(method, info.entry()); |
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311 if (TraceICs) { |
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312 ResourceMark rm(thread); |
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313 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter: %s", |
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314 instruction_address(), |
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315 method->print_value_string()); |
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316 } |
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317 } else { |
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318 // Call via method-klass-holder |
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319 assert(info.cached_oop().not_null(), "must be set"); |
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320 InlineCacheBuffer::create_transition_stub(this, info.cached_oop()(), info.entry()); |
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321 |
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322 if (TraceICs) { |
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323 ResourceMark rm(thread); |
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324 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter via mkh", instruction_address()); |
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325 } |
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326 } |
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327 } else { |
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328 // Call to compiled code |
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329 bool static_bound = info.is_optimized() || (info.cached_oop().is_null()); |
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330 #ifdef ASSERT |
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331 CodeBlob* cb = CodeCache::find_blob_unsafe(info.entry()); |
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332 assert (cb->is_nmethod(), "must be compiled!"); |
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333 #endif /* ASSERT */ |
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334 |
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335 // This is MT safe if we come from a clean-cache and go through a |
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336 // non-verified entry point |
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337 bool safe = SafepointSynchronize::is_at_safepoint() || |
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338 (!is_in_transition_state() && (info.is_optimized() || static_bound || is_clean())); |
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339 |
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340 if (!safe) { |
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341 InlineCacheBuffer::create_transition_stub(this, info.cached_oop()(), info.entry()); |
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342 } else { |
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343 set_ic_destination(info.entry()); |
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344 if (!is_optimized()) set_cached_oop(info.cached_oop()()); |
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345 } |
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346 |
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347 if (TraceICs) { |
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348 ResourceMark rm(thread); |
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349 assert(info.cached_oop() == NULL || info.cached_oop()()->is_klass(), "must be"); |
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350 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to compiled (rcvr klass) %s: %s", |
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351 instruction_address(), |
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352 ((klassOop)info.cached_oop()())->print_value_string(), |
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353 (safe) ? "" : "via stub"); |
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354 } |
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355 } |
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356 // We can't check this anymore. With lazy deopt we could have already |
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357 // cleaned this IC entry before we even return. This is possible if |
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358 // we ran out of space in the inline cache buffer trying to do the |
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359 // set_next and we safepointed to free up space. This is a benign |
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360 // race because the IC entry was complete when we safepointed so |
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361 // cleaning it immediately is harmless. |
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362 // assert(is_call_to_compiled() || is_call_to_interpreted(), "sanity check"); |
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363 } |
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364 |
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365 |
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366 // is_optimized: Compiler has generated an optimized call (i.e., no inline |
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367 // cache) static_bound: The call can be static bound (i.e, no need to use |
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368 // inline cache) |
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369 void CompiledIC::compute_monomorphic_entry(methodHandle method, |
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370 KlassHandle receiver_klass, |
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371 bool is_optimized, |
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372 bool static_bound, |
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373 CompiledICInfo& info, |
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374 TRAPS) { |
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375 info._is_optimized = is_optimized; |
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376 |
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377 nmethod* method_code = method->code(); |
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378 address entry = NULL; |
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379 if (method_code != NULL) { |
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380 // Call to compiled code |
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381 if (static_bound || is_optimized) { |
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382 entry = method_code->verified_entry_point(); |
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383 } else { |
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384 entry = method_code->entry_point(); |
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385 } |
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386 } |
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387 if (entry != NULL) { |
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388 // Call to compiled code |
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389 info._entry = entry; |
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390 if (static_bound || is_optimized) { |
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391 info._cached_oop = Handle(THREAD, (oop)NULL); |
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392 } else { |
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393 info._cached_oop = receiver_klass; |
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394 } |
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395 info._to_interpreter = false; |
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396 } else { |
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397 // Note: the following problem exists with Compiler1: |
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398 // - at compile time we may or may not know if the destination is final |
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399 // - if we know that the destination is final, we will emit an optimized |
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400 // virtual call (no inline cache), and need a methodOop to make a call |
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401 // to the interpreter |
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402 // - if we do not know if the destination is final, we emit a standard |
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403 // virtual call, and use CompiledICHolder to call interpreted code |
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404 // (no static call stub has been generated) |
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405 // However in that case we will now notice it is static_bound |
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406 // and convert the call into what looks to be an optimized |
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407 // virtual call. This causes problems in verifying the IC because |
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408 // it look vanilla but is optimized. Code in is_call_to_interpreted |
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409 // is aware of this and weakens its asserts. |
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410 |
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411 info._to_interpreter = true; |
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412 // static_bound should imply is_optimized -- otherwise we have a |
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413 // performance bug (statically-bindable method is called via |
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414 // dynamically-dispatched call note: the reverse implication isn't |
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415 // necessarily true -- the call may have been optimized based on compiler |
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416 // analysis (static_bound is only based on "final" etc.) |
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417 #ifdef COMPILER2 |
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418 #ifdef TIERED |
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419 #if defined(ASSERT) |
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420 // can't check the assert because we don't have the CompiledIC with which to |
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421 // find the address if the call instruction. |
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422 // |
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423 // CodeBlob* cb = find_blob_unsafe(instruction_address()); |
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424 // assert(cb->is_compiled_by_c1() || !static_bound || is_optimized, "static_bound should imply is_optimized"); |
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425 #endif // ASSERT |
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426 #else |
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427 assert(!static_bound || is_optimized, "static_bound should imply is_optimized"); |
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428 #endif // TIERED |
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429 #endif // COMPILER2 |
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430 if (is_optimized) { |
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431 // Use stub entry |
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432 info._entry = method()->get_c2i_entry(); |
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433 info._cached_oop = method; |
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434 } else { |
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435 // Use mkh entry |
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436 oop holder = oopFactory::new_compiledICHolder(method, receiver_klass, CHECK); |
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437 info._cached_oop = Handle(THREAD, holder); |
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438 info._entry = method()->get_c2i_unverified_entry(); |
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439 } |
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440 } |
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441 } |
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442 |
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443 |
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444 inline static RelocIterator parse_ic(CodeBlob* code, address ic_call, oop* &_oop_addr, bool *is_optimized) { |
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445 address first_oop = NULL; |
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446 // Mergers please note: Sun SC5.x CC insists on an lvalue for a reference parameter. |
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447 CodeBlob *code1 = code; |
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448 return virtual_call_Relocation::parse_ic(code1, ic_call, first_oop, _oop_addr, is_optimized); |
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449 } |
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450 |
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451 CompiledIC::CompiledIC(NativeCall* ic_call) |
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452 : _ic_call(ic_call), |
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453 _oops(parse_ic(NULL, ic_call->instruction_address(), _oop_addr, &_is_optimized)) |
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454 { |
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455 } |
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456 |
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457 |
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458 CompiledIC::CompiledIC(Relocation* ic_reloc) |
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459 : _ic_call(nativeCall_at(ic_reloc->addr())), |
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460 _oops(parse_ic(ic_reloc->code(), ic_reloc->addr(), _oop_addr, &_is_optimized)) |
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461 { |
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462 assert(ic_reloc->type() == relocInfo::virtual_call_type || |
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463 ic_reloc->type() == relocInfo::opt_virtual_call_type, "wrong reloc. info"); |
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464 } |
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465 |
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466 |
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467 // ---------------------------------------------------------------------------- |
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468 |
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469 void CompiledStaticCall::set_to_clean() { |
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470 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); |
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471 // Reset call site |
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472 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); |
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473 #ifdef ASSERT |
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474 CodeBlob* cb = CodeCache::find_blob_unsafe(this); |
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475 assert(cb != NULL && cb->is_nmethod(), "must be nmethod"); |
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476 #endif |
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477 set_destination_mt_safe(SharedRuntime::get_resolve_static_call_stub()); |
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478 |
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479 // Do not reset stub here: It is too expensive to call find_stub. |
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480 // Instead, rely on caller (nmethod::clear_inline_caches) to clear |
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481 // both the call and its stub. |
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482 } |
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483 |
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484 |
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485 bool CompiledStaticCall::is_clean() const { |
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486 return destination() == SharedRuntime::get_resolve_static_call_stub(); |
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487 } |
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488 |
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489 bool CompiledStaticCall::is_call_to_compiled() const { |
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490 return CodeCache::contains(destination()); |
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491 } |
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492 |
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493 |
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494 bool CompiledStaticCall::is_call_to_interpreted() const { |
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495 // It is a call to interpreted, if it calls to a stub. Hence, the destination |
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496 // must be in the stub part of the nmethod that contains the call |
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497 nmethod* nm = CodeCache::find_nmethod(instruction_address()); |
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498 return nm->stub_contains(destination()); |
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499 } |
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500 |
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501 |
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502 void CompiledStaticCall::set_to_interpreted(methodHandle callee, address entry) { |
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503 address stub=find_stub(); |
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504 assert(stub!=NULL, "stub not found"); |
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505 |
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506 if (TraceICs) { |
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507 ResourceMark rm; |
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508 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s", |
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509 instruction_address(), |
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510 callee->name_and_sig_as_C_string()); |
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511 } |
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512 |
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513 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); // creation also verifies the object |
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514 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); |
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515 |
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516 assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee(), "a) MT-unsafe modification of inline cache"); |
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517 assert(jump->jump_destination() == (address)-1 || jump->jump_destination() == entry, "b) MT-unsafe modification of inline cache"); |
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518 |
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519 // Update stub |
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520 method_holder->set_data((intptr_t)callee()); |
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521 jump->set_jump_destination(entry); |
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522 |
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523 // Update jump to call |
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524 set_destination_mt_safe(stub); |
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525 } |
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526 |
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527 |
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528 void CompiledStaticCall::set(const StaticCallInfo& info) { |
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529 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); |
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530 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); |
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531 // Updating a cache to the wrong entry can cause bugs that are very hard |
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532 // to track down - if cache entry gets invalid - we just clean it. In |
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533 // this way it is always the same code path that is responsible for |
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534 // updating and resolving an inline cache |
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535 assert(is_clean(), "do not update a call entry - use clean"); |
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536 |
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537 if (info._to_interpreter) { |
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538 // Call to interpreted code |
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539 set_to_interpreted(info.callee(), info.entry()); |
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540 } else { |
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541 if (TraceICs) { |
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542 ResourceMark rm; |
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543 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_compiled " INTPTR_FORMAT, |
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544 instruction_address(), |
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545 info.entry()); |
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546 } |
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547 // Call to compiled code |
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548 assert (CodeCache::contains(info.entry()), "wrong entry point"); |
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549 set_destination_mt_safe(info.entry()); |
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550 } |
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551 } |
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552 |
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553 |
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554 // Compute settings for a CompiledStaticCall. Since we might have to set |
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555 // the stub when calling to the interpreter, we need to return arguments. |
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556 void CompiledStaticCall::compute_entry(methodHandle m, StaticCallInfo& info) { |
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557 nmethod* m_code = m->code(); |
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558 info._callee = m; |
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559 if (m_code != NULL) { |
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560 info._to_interpreter = false; |
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561 info._entry = m_code->verified_entry_point(); |
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562 } else { |
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563 // Callee is interpreted code. In any case entering the interpreter |
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564 // puts a converter-frame on the stack to save arguments. |
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565 info._to_interpreter = true; |
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566 info._entry = m()->get_c2i_entry(); |
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567 } |
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568 } |
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569 |
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570 |
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571 void CompiledStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) { |
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572 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); |
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573 // Reset stub |
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574 address stub = static_stub->addr(); |
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575 assert(stub!=NULL, "stub not found"); |
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576 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); // creation also verifies the object |
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577 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); |
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578 method_holder->set_data(0); |
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579 jump->set_jump_destination((address)-1); |
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580 } |
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581 |
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582 |
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583 address CompiledStaticCall::find_stub() { |
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584 // Find reloc. information containing this call-site |
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585 RelocIterator iter((nmethod*)NULL, instruction_address()); |
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586 while (iter.next()) { |
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587 if (iter.addr() == instruction_address()) { |
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588 switch(iter.type()) { |
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589 case relocInfo::static_call_type: |
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590 return iter.static_call_reloc()->static_stub(); |
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591 // We check here for opt_virtual_call_type, since we reuse the code |
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592 // from the CompiledIC implementation |
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593 case relocInfo::opt_virtual_call_type: |
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594 return iter.opt_virtual_call_reloc()->static_stub(); |
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595 case relocInfo::poll_type: |
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596 case relocInfo::poll_return_type: // A safepoint can't overlap a call. |
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597 default: |
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598 ShouldNotReachHere(); |
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599 } |
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600 } |
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601 } |
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602 return NULL; |
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603 } |
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604 |
|
605 |
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606 //----------------------------------------------------------------------------- |
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607 // Non-product mode code |
|
608 #ifndef PRODUCT |
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609 |
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610 void CompiledIC::verify() { |
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611 // make sure code pattern is actually a call imm32 instruction |
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612 _ic_call->verify(); |
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613 if (os::is_MP()) { |
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614 _ic_call->verify_alignment(); |
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615 } |
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616 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted() |
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617 || is_optimized() || is_megamorphic(), "sanity check"); |
|
618 } |
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619 |
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620 |
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621 void CompiledIC::print() { |
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622 print_compiled_ic(); |
|
623 tty->cr(); |
|
624 } |
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625 |
|
626 |
|
627 void CompiledIC::print_compiled_ic() { |
|
628 tty->print("Inline cache at " INTPTR_FORMAT ", calling %s " INTPTR_FORMAT, |
|
629 instruction_address(), is_call_to_interpreted() ? "interpreted " : "", ic_destination()); |
|
630 } |
|
631 |
|
632 |
|
633 void CompiledStaticCall::print() { |
|
634 tty->print("static call at " INTPTR_FORMAT " -> ", instruction_address()); |
|
635 if (is_clean()) { |
|
636 tty->print("clean"); |
|
637 } else if (is_call_to_compiled()) { |
|
638 tty->print("compiled"); |
|
639 } else if (is_call_to_interpreted()) { |
|
640 tty->print("interpreted"); |
|
641 } |
|
642 tty->cr(); |
|
643 } |
|
644 |
|
645 void CompiledStaticCall::verify() { |
|
646 // Verify call |
|
647 NativeCall::verify(); |
|
648 if (os::is_MP()) { |
|
649 verify_alignment(); |
|
650 } |
|
651 |
|
652 // Verify stub |
|
653 address stub = find_stub(); |
|
654 assert(stub != NULL, "no stub found for static call"); |
|
655 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); // creation also verifies the object |
|
656 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); |
|
657 |
|
658 // Verify state |
|
659 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check"); |
|
660 } |
|
661 |
|
662 #endif |