Mercurial > hg > truffle
annotate src/share/vm/code/compiledIC.cpp @ 8136:c66aa27ef4da
Reenable patching of optimized and static calls but without out-of-line stubs.
| author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
|---|---|
| date | Wed, 06 Mar 2013 21:58:58 +0100 |
| parents | 1baf7f1e3f23 |
| children | b8f261ba79c6 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 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. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/systemDictionary.hpp" | |
| 27 #include "code/codeCache.hpp" | |
| 28 #include "code/compiledIC.hpp" | |
| 29 #include "code/icBuffer.hpp" | |
| 30 #include "code/nmethod.hpp" | |
| 31 #include "code/vtableStubs.hpp" | |
| 32 #include "interpreter/interpreter.hpp" | |
| 33 #include "interpreter/linkResolver.hpp" | |
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34 #include "memory/metadataFactory.hpp" |
| 1972 | 35 #include "memory/oopFactory.hpp" |
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36 #include "oops/method.hpp" |
| 1972 | 37 #include "oops/oop.inline.hpp" |
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38 #include "oops/symbol.hpp" |
| 1972 | 39 #include "runtime/icache.hpp" |
| 40 #include "runtime/sharedRuntime.hpp" | |
| 41 #include "runtime/stubRoutines.hpp" | |
| 42 #include "utilities/events.hpp" | |
| 0 | 43 |
| 44 | |
| 45 // Every time a compiled IC is changed or its type is being accessed, | |
| 46 // either the CompiledIC_lock must be set or we must be at a safe point. | |
| 47 | |
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48 |
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49 // Release the CompiledICHolder* associated with this call site is there is one. |
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50 void CompiledIC::cleanup_call_site(virtual_call_Relocation* call_site) { |
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51 // This call site might have become stale so inspect it carefully. |
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52 NativeCall* call = nativeCall_at(call_site->addr()); |
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53 if (is_icholder_entry(call->destination())) { |
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54 NativeMovConstReg* value = nativeMovConstReg_at(call_site->cached_value()); |
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55 InlineCacheBuffer::queue_for_release((CompiledICHolder*)value->data()); |
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56 } |
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57 } |
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58 |
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59 |
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60 bool CompiledIC::is_icholder_call_site(virtual_call_Relocation* call_site) { |
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61 // This call site might have become stale so inspect it carefully. |
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62 NativeCall* call = nativeCall_at(call_site->addr()); |
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63 return is_icholder_entry(call->destination()); |
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64 } |
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65 |
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66 |
| 0 | 67 //----------------------------------------------------------------------------- |
| 68 // Low-level access to an inline cache. Private, since they might not be | |
| 69 // MT-safe to use. | |
| 70 | |
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71 void* CompiledIC::cached_value() const { |
| 0 | 72 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
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73 assert (!is_optimized(), "an optimized virtual call does not have a cached metadata"); |
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74 |
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75 if (!is_in_transition_state()) { |
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76 void* data = (void*)_value->data(); |
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77 // If we let the metadata value here be initialized to zero... |
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78 assert(data != NULL || Universe::non_oop_word() == NULL, |
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79 "no raw nulls in CompiledIC metadatas, because of patching races"); |
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80 return (data == (void*)Universe::non_oop_word()) ? NULL : data; |
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81 } else { |
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82 return InlineCacheBuffer::cached_value_for((CompiledIC *)this); |
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83 } |
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84 } |
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85 |
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86 |
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87 void CompiledIC::internal_set_ic_destination(address entry_point, bool is_icstub, void* cache, bool is_icholder) { |
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88 assert(entry_point != NULL, "must set legal entry point"); |
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89 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
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90 assert (!is_optimized() || cache == NULL, "an optimized virtual call does not have a cached metadata"); |
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91 assert (cache == NULL || cache != (Metadata*)badOopVal, "invalid metadata"); |
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92 |
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93 assert(!is_icholder || is_icholder_entry(entry_point), "must be"); |
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94 |
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95 // Don't use ic_destination for this test since that forwards |
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96 // through ICBuffer instead of returning the actual current state of |
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97 // the CompiledIC. |
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98 if (is_icholder_entry(_ic_call->destination()) && !_is_optimized) { |
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99 // When patching for the ICStub case the cached value isn't |
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100 // overwritten until the ICStub copied into the CompiledIC during |
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101 // the next safepoint. Make sure that the CompiledICHolder* is |
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102 // marked for release at this point since it won't be identifiable |
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103 // once the entry point is overwritten. |
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104 InlineCacheBuffer::queue_for_release((CompiledICHolder*)_value->data()); |
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105 } |
| 0 | 106 |
| 107 if (TraceCompiledIC) { | |
| 108 tty->print(" "); | |
| 109 print_compiled_ic(); | |
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110 tty->print(" changing destination to " INTPTR_FORMAT, entry_point); |
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111 if (!is_optimized()) { |
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112 tty->print(" changing cached %s to " INTPTR_FORMAT, is_icholder ? "icholder" : "metadata", (address)cache); |
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113 } |
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114 if (is_icstub) { |
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115 tty->print(" (icstub)"); |
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116 } |
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117 tty->cr(); |
| 0 | 118 } |
| 119 | |
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120 { |
| 0 | 121 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); |
| 122 #ifdef ASSERT | |
| 123 CodeBlob* cb = CodeCache::find_blob_unsafe(_ic_call); | |
| 124 assert(cb != NULL && cb->is_nmethod(), "must be nmethod"); | |
| 125 #endif | |
| 126 _ic_call->set_destination_mt_safe(entry_point); | |
| 127 } | |
| 128 | |
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129 #ifdef GRAAL |
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130 if (_value == NULL) { |
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131 // Can happen when Graal converted a virtual call into an invoke special based on static analysis. |
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132 return; |
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133 } |
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134 #endif |
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135 |
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136 if (is_optimized() || is_icstub) { |
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137 // Optimized call sites don't have a cache value and ICStub call |
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138 // sites only change the entry point. Changing the value in that |
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139 // case could lead to MT safety issues. |
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140 assert(cache == NULL, "must be null"); |
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141 return; |
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142 } |
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143 |
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144 if (cache == NULL) cache = (void*)Universe::non_oop_word(); |
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145 |
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146 _value->set_data((intptr_t)cache); |
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147 } |
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148 |
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149 |
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150 void CompiledIC::set_ic_destination(ICStub* stub) { |
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151 internal_set_ic_destination(stub->code_begin(), true, NULL, false); |
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152 } |
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153 |
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154 |
| 0 | 155 |
| 156 address CompiledIC::ic_destination() const { | |
| 157 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
| 158 if (!is_in_transition_state()) { | |
| 159 return _ic_call->destination(); | |
| 160 } else { | |
| 161 return InlineCacheBuffer::ic_destination_for((CompiledIC *)this); | |
| 162 } | |
| 163 } | |
| 164 | |
| 165 | |
| 166 bool CompiledIC::is_in_transition_state() const { | |
| 167 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
| 168 return InlineCacheBuffer::contains(_ic_call->destination()); | |
| 169 } | |
| 170 | |
| 171 | |
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172 bool CompiledIC::is_icholder_call() const { |
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173 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
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174 return !_is_optimized && is_icholder_entry(ic_destination()); |
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175 } |
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176 |
| 0 | 177 // Returns native address of 'call' instruction in inline-cache. Used by |
| 178 // the InlineCacheBuffer when it needs to find the stub. | |
| 179 address CompiledIC::stub_address() const { | |
| 180 assert(is_in_transition_state(), "should only be called when we are in a transition state"); | |
| 181 return _ic_call->destination(); | |
| 182 } | |
| 183 | |
| 184 | |
| 185 //----------------------------------------------------------------------------- | |
| 186 // High-level access to an inline cache. Guaranteed to be MT-safe. | |
| 187 | |
| 188 | |
| 189 void CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS) { | |
| 190 methodHandle method = call_info->selected_method(); | |
| 191 bool is_invoke_interface = (bytecode == Bytecodes::_invokeinterface && !call_info->has_vtable_index()); | |
| 192 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
| 193 assert(!is_optimized(), "cannot set an optimized virtual call to megamorphic"); | |
| 194 assert(is_call_to_compiled() || is_call_to_interpreted(), "going directly to megamorphic?"); | |
| 195 | |
| 196 address entry; | |
| 197 if (is_invoke_interface) { | |
| 198 int index = klassItable::compute_itable_index(call_info->resolved_method()()); | |
| 199 entry = VtableStubs::create_stub(false, index, method()); | |
| 200 assert(entry != NULL, "entry not computed"); | |
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201 InstanceKlass* k = call_info->resolved_method()->method_holder(); |
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202 assert(k->is_interface(), "sanity check"); |
| 0 | 203 InlineCacheBuffer::create_transition_stub(this, k, entry); |
| 204 } else { | |
| 205 // Can be different than method->vtable_index(), due to package-private etc. | |
| 206 int vtable_index = call_info->vtable_index(); | |
| 207 entry = VtableStubs::create_stub(true, vtable_index, method()); | |
| 208 InlineCacheBuffer::create_transition_stub(this, method(), entry); | |
| 209 } | |
| 210 | |
| 211 if (TraceICs) { | |
| 212 ResourceMark rm; | |
| 213 tty->print_cr ("IC@" INTPTR_FORMAT ": to megamorphic %s entry: " INTPTR_FORMAT, | |
| 214 instruction_address(), method->print_value_string(), entry); | |
| 215 } | |
| 216 | |
| 217 // We can't check this anymore. With lazy deopt we could have already | |
| 218 // cleaned this IC entry before we even return. This is possible if | |
| 219 // we ran out of space in the inline cache buffer trying to do the | |
| 220 // set_next and we safepointed to free up space. This is a benign | |
| 221 // race because the IC entry was complete when we safepointed so | |
| 222 // cleaning it immediately is harmless. | |
| 223 // assert(is_megamorphic(), "sanity check"); | |
| 224 } | |
| 225 | |
| 226 | |
| 227 // true if destination is megamorphic stub | |
| 228 bool CompiledIC::is_megamorphic() const { | |
| 229 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
| 230 assert(!is_optimized(), "an optimized call cannot be megamorphic"); | |
| 231 | |
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232 // Cannot rely on cached_value. It is either an interface or a method. |
| 0 | 233 return VtableStubs::is_entry_point(ic_destination()); |
| 234 } | |
| 235 | |
| 236 bool CompiledIC::is_call_to_compiled() const { | |
| 237 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
| 238 | |
| 239 // Use unsafe, since an inline cache might point to a zombie method. However, the zombie | |
| 240 // method is guaranteed to still exist, since we only remove methods after all inline caches | |
| 241 // has been cleaned up | |
| 242 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination()); | |
| 243 bool is_monomorphic = (cb != NULL && cb->is_nmethod()); | |
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244 // Check that the cached_value is a klass for non-optimized monomorphic calls |
| 0 | 245 // This assertion is invalid for compiler1: a call that does not look optimized (no static stub) can be used |
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246 // for calling directly to vep without using the inline cache (i.e., cached_value == NULL) |
| 0 | 247 #ifdef ASSERT |
| 248 CodeBlob* caller = CodeCache::find_blob_unsafe(instruction_address()); | |
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249 bool is_c1_or_graal_method = caller->is_compiled_by_c1() || caller->is_compiled_by_graal(); |
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250 assert( is_c1_or_graal_method || |
| 0 | 251 !is_monomorphic || |
| 252 is_optimized() || | |
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253 (cached_metadata() != NULL && cached_metadata()->is_klass()), "sanity check"); |
| 0 | 254 #endif // ASSERT |
| 255 return is_monomorphic; | |
| 256 } | |
| 257 | |
| 258 | |
| 259 bool CompiledIC::is_call_to_interpreted() const { | |
| 260 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
| 261 // Call to interpreter if destination is either calling to a stub (if it | |
| 262 // is optimized), or calling to an I2C blob | |
| 263 bool is_call_to_interpreted = false; | |
| 264 if (!is_optimized()) { | |
| 265 // must use unsafe because the destination can be a zombie (and we're cleaning) | |
| 266 // and the print_compiled_ic code wants to know if site (in the non-zombie) | |
| 267 // is to the interpreter. | |
| 268 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination()); | |
| 269 is_call_to_interpreted = (cb != NULL && cb->is_adapter_blob()); | |
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270 assert(!is_call_to_interpreted || (is_icholder_call() && cached_icholder() != NULL), "sanity check"); |
| 0 | 271 } else { |
| 272 // Check if we are calling into our own codeblob (i.e., to a stub) | |
| 273 CodeBlob* cb = CodeCache::find_blob(_ic_call->instruction_address()); | |
| 274 address dest = ic_destination(); | |
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275 #ifndef GRAAL |
| 0 | 276 #ifdef ASSERT |
| 277 { | |
| 278 CodeBlob* db = CodeCache::find_blob_unsafe(dest); | |
| 279 assert(!db->is_adapter_blob(), "must use stub!"); | |
| 280 } | |
| 281 #endif /* ASSERT */ | |
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282 #endif |
| 0 | 283 is_call_to_interpreted = cb->contains(dest); |
| 284 } | |
| 285 return is_call_to_interpreted; | |
| 286 } | |
| 287 | |
| 288 | |
| 289 void CompiledIC::set_to_clean() { | |
| 290 assert(SafepointSynchronize::is_at_safepoint() || CompiledIC_lock->is_locked() , "MT-unsafe call"); | |
| 291 if (TraceInlineCacheClearing || TraceICs) { | |
| 292 tty->print_cr("IC@" INTPTR_FORMAT ": set to clean", instruction_address()); | |
| 293 print(); | |
| 294 } | |
| 295 | |
| 296 address entry; | |
| 297 if (is_optimized()) { | |
| 298 entry = SharedRuntime::get_resolve_opt_virtual_call_stub(); | |
| 299 } else { | |
| 300 entry = SharedRuntime::get_resolve_virtual_call_stub(); | |
| 301 } | |
| 302 | |
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303 // A zombie transition will always be safe, since the metadata has already been set to NULL, so |
| 0 | 304 // we only need to patch the destination |
| 305 bool safe_transition = is_optimized() || SafepointSynchronize::is_at_safepoint(); | |
| 306 | |
| 307 if (safe_transition) { | |
| 308 // Kill any leftover stub we might have too | |
| 309 if (is_in_transition_state()) { | |
| 310 ICStub* old_stub = ICStub_from_destination_address(stub_address()); | |
| 311 old_stub->clear(); | |
| 312 } | |
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313 if (is_optimized()) { |
| 0 | 314 set_ic_destination(entry); |
| 315 } else { | |
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316 set_ic_destination_and_value(entry, (void*)NULL); |
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317 } |
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318 } else { |
| 0 | 319 // Unsafe transition - create stub. |
| 320 InlineCacheBuffer::create_transition_stub(this, NULL, entry); | |
| 321 } | |
| 322 // We can't check this anymore. With lazy deopt we could have already | |
| 323 // cleaned this IC entry before we even return. This is possible if | |
| 324 // we ran out of space in the inline cache buffer trying to do the | |
| 325 // set_next and we safepointed to free up space. This is a benign | |
| 326 // race because the IC entry was complete when we safepointed so | |
| 327 // cleaning it immediately is harmless. | |
| 328 // assert(is_clean(), "sanity check"); | |
| 329 } | |
| 330 | |
| 331 | |
| 332 bool CompiledIC::is_clean() const { | |
| 333 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
| 334 bool is_clean = false; | |
| 335 address dest = ic_destination(); | |
| 336 is_clean = dest == SharedRuntime::get_resolve_opt_virtual_call_stub() || | |
| 337 dest == SharedRuntime::get_resolve_virtual_call_stub(); | |
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338 assert(!is_clean || is_optimized() || cached_value() == NULL, "sanity check"); |
| 0 | 339 return is_clean; |
| 340 } | |
| 341 | |
| 342 | |
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343 void CompiledIC::set_to_monomorphic(CompiledICInfo& info) { |
| 0 | 344 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
| 345 // Updating a cache to the wrong entry can cause bugs that are very hard | |
| 346 // to track down - if cache entry gets invalid - we just clean it. In | |
| 347 // this way it is always the same code path that is responsible for | |
| 348 // updating and resolving an inline cache | |
| 349 // | |
| 350 // The above is no longer true. SharedRuntime::fixup_callers_callsite will change optimized | |
| 351 // callsites. In addition ic_miss code will update a site to monomorphic if it determines | |
| 352 // that an monomorphic call to the interpreter can now be monomorphic to compiled code. | |
| 353 // | |
| 354 // In both of these cases the only thing being modifed is the jump/call target and these | |
| 355 // transitions are mt_safe | |
| 356 | |
| 357 Thread *thread = Thread::current(); | |
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358 if (info.to_interpreter()) { |
| 0 | 359 // Call to interpreter |
| 360 if (info.is_optimized() && is_optimized()) { | |
| 361 assert(is_clean(), "unsafe IC path"); | |
| 362 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); | |
| 363 // the call analysis (callee structure) specifies that the call is optimized | |
| 364 // (either because of CHA or the static target is final) | |
| 365 // At code generation time, this call has been emitted as static call | |
| 366 // Call via stub | |
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367 assert(info.cached_metadata() != NULL && info.cached_metadata()->is_method(), "sanity check"); |
| 0 | 368 CompiledStaticCall* csc = compiledStaticCall_at(instruction_address()); |
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369 methodHandle method (thread, (Method*)info.cached_metadata()); |
| 0 | 370 csc->set_to_interpreted(method, info.entry()); |
| 371 if (TraceICs) { | |
| 372 ResourceMark rm(thread); | |
| 373 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter: %s", | |
| 374 instruction_address(), | |
| 375 method->print_value_string()); | |
| 376 } | |
| 377 } else { | |
| 378 // Call via method-klass-holder | |
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379 InlineCacheBuffer::create_transition_stub(this, info.claim_cached_icholder(), info.entry()); |
| 0 | 380 if (TraceICs) { |
| 381 ResourceMark rm(thread); | |
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382 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter via icholder ", instruction_address()); |
| 0 | 383 } |
| 384 } | |
| 385 } else { | |
| 386 // Call to compiled code | |
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387 bool static_bound = info.is_optimized() || (info.cached_metadata() == NULL); |
| 0 | 388 #ifdef ASSERT |
| 389 CodeBlob* cb = CodeCache::find_blob_unsafe(info.entry()); | |
| 390 assert (cb->is_nmethod(), "must be compiled!"); | |
| 391 #endif /* ASSERT */ | |
| 392 | |
| 393 // This is MT safe if we come from a clean-cache and go through a | |
| 394 // non-verified entry point | |
| 395 bool safe = SafepointSynchronize::is_at_safepoint() || | |
| 396 (!is_in_transition_state() && (info.is_optimized() || static_bound || is_clean())); | |
| 397 | |
| 398 if (!safe) { | |
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399 InlineCacheBuffer::create_transition_stub(this, info.cached_metadata(), info.entry()); |
| 0 | 400 } else { |
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401 if (is_optimized()) { |
| 0 | 402 set_ic_destination(info.entry()); |
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403 } else { |
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404 set_ic_destination_and_value(info.entry(), info.cached_metadata()); |
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405 } |
| 0 | 406 } |
| 407 | |
| 408 if (TraceICs) { | |
| 409 ResourceMark rm(thread); | |
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410 assert(info.cached_metadata() == NULL || info.cached_metadata()->is_klass(), "must be"); |
| 0 | 411 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to compiled (rcvr klass) %s: %s", |
| 412 instruction_address(), | |
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413 ((Klass*)info.cached_metadata())->print_value_string(), |
| 0 | 414 (safe) ? "" : "via stub"); |
| 415 } | |
| 416 } | |
| 417 // We can't check this anymore. With lazy deopt we could have already | |
| 418 // cleaned this IC entry before we even return. This is possible if | |
| 419 // we ran out of space in the inline cache buffer trying to do the | |
| 420 // set_next and we safepointed to free up space. This is a benign | |
| 421 // race because the IC entry was complete when we safepointed so | |
| 422 // cleaning it immediately is harmless. | |
| 423 // assert(is_call_to_compiled() || is_call_to_interpreted(), "sanity check"); | |
| 424 } | |
| 425 | |
| 426 | |
| 427 // is_optimized: Compiler has generated an optimized call (i.e., no inline | |
| 428 // cache) static_bound: The call can be static bound (i.e, no need to use | |
| 429 // inline cache) | |
| 430 void CompiledIC::compute_monomorphic_entry(methodHandle method, | |
| 431 KlassHandle receiver_klass, | |
| 432 bool is_optimized, | |
| 433 bool static_bound, | |
| 434 CompiledICInfo& info, | |
| 435 TRAPS) { | |
| 436 nmethod* method_code = method->code(); | |
| 437 address entry = NULL; | |
| 438 if (method_code != NULL) { | |
| 439 // Call to compiled code | |
| 440 if (static_bound || is_optimized) { | |
| 441 entry = method_code->verified_entry_point(); | |
| 442 } else { | |
| 443 entry = method_code->entry_point(); | |
| 444 } | |
| 445 } | |
| 446 if (entry != NULL) { | |
| 447 // Call to compiled code | |
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448 info.set_compiled_entry(entry, (static_bound || is_optimized) ? NULL : receiver_klass(), is_optimized); |
| 0 | 449 } else { |
| 450 // Note: the following problem exists with Compiler1: | |
| 451 // - at compile time we may or may not know if the destination is final | |
| 452 // - if we know that the destination is final, we will emit an optimized | |
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453 // virtual call (no inline cache), and need a Method* to make a call |
| 0 | 454 // to the interpreter |
| 455 // - if we do not know if the destination is final, we emit a standard | |
| 456 // virtual call, and use CompiledICHolder to call interpreted code | |
| 457 // (no static call stub has been generated) | |
| 458 // However in that case we will now notice it is static_bound | |
| 459 // and convert the call into what looks to be an optimized | |
| 460 // virtual call. This causes problems in verifying the IC because | |
| 461 // it look vanilla but is optimized. Code in is_call_to_interpreted | |
| 462 // is aware of this and weakens its asserts. | |
| 463 | |
| 464 // static_bound should imply is_optimized -- otherwise we have a | |
| 465 // performance bug (statically-bindable method is called via | |
| 466 // dynamically-dispatched call note: the reverse implication isn't | |
| 467 // necessarily true -- the call may have been optimized based on compiler | |
| 468 // analysis (static_bound is only based on "final" etc.) | |
| 469 #ifdef COMPILER2 | |
| 470 #ifdef TIERED | |
| 471 #if defined(ASSERT) | |
| 472 // can't check the assert because we don't have the CompiledIC with which to | |
| 473 // find the address if the call instruction. | |
| 474 // | |
| 475 // CodeBlob* cb = find_blob_unsafe(instruction_address()); | |
| 476 // assert(cb->is_compiled_by_c1() || !static_bound || is_optimized, "static_bound should imply is_optimized"); | |
| 477 #endif // ASSERT | |
| 478 #else | |
| 479 assert(!static_bound || is_optimized, "static_bound should imply is_optimized"); | |
| 480 #endif // TIERED | |
| 481 #endif // COMPILER2 | |
| 482 if (is_optimized) { | |
| 483 // Use stub entry | |
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484 info.set_interpreter_entry(method()->get_c2i_entry(), method()); |
| 0 | 485 } else { |
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486 // Use icholder entry |
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487 CompiledICHolder* holder = new CompiledICHolder(method(), receiver_klass()); |
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488 info.set_icholder_entry(method()->get_c2i_unverified_entry(), holder); |
| 0 | 489 } |
| 490 } | |
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491 assert(info.is_optimized() == is_optimized, "must agree"); |
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492 } |
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493 |
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494 |
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495 bool CompiledIC::is_icholder_entry(address entry) { |
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496 CodeBlob* cb = CodeCache::find_blob_unsafe(entry); |
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497 return (cb != NULL && cb->is_adapter_blob()); |
| 0 | 498 } |
| 499 | |
| 500 | |
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501 CompiledIC::CompiledIC(nmethod* nm, NativeCall* call) |
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502 : _ic_call(call) |
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503 { |
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504 address ic_call = call->instruction_address(); |
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505 |
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506 assert(ic_call != NULL, "ic_call address must be set"); |
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507 assert(nm != NULL, "must pass nmethod"); |
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508 assert(nm->contains(ic_call), "must be in nmethod"); |
| 0 | 509 |
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510 // search for the ic_call at the given address |
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511 RelocIterator iter(nm, ic_call, ic_call+1); |
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512 bool ret = iter.next(); |
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513 assert(ret == true, "relocInfo must exist at this address"); |
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514 assert(iter.addr() == ic_call, "must find ic_call"); |
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515 if (iter.type() == relocInfo::virtual_call_type) { |
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516 virtual_call_Relocation* r = iter.virtual_call_reloc(); |
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517 _is_optimized = false; |
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518 _value = nativeMovConstReg_at(r->cached_value()); |
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519 } else { |
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520 assert(iter.type() == relocInfo::opt_virtual_call_type, "must be a virtual call"); |
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521 _is_optimized = true; |
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522 _value = NULL; |
| 0 | 523 } |
| 524 } | |
| 525 | |
| 526 | |
| 527 // ---------------------------------------------------------------------------- | |
| 528 | |
| 529 void CompiledStaticCall::set_to_clean() { | |
| 530 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); | |
| 531 // Reset call site | |
| 532 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); | |
| 533 #ifdef ASSERT | |
| 534 CodeBlob* cb = CodeCache::find_blob_unsafe(this); | |
| 535 assert(cb != NULL && cb->is_nmethod(), "must be nmethod"); | |
| 536 #endif | |
| 537 set_destination_mt_safe(SharedRuntime::get_resolve_static_call_stub()); | |
| 538 | |
| 539 // Do not reset stub here: It is too expensive to call find_stub. | |
| 540 // Instead, rely on caller (nmethod::clear_inline_caches) to clear | |
| 541 // both the call and its stub. | |
| 542 } | |
| 543 | |
| 544 | |
| 545 bool CompiledStaticCall::is_clean() const { | |
| 546 return destination() == SharedRuntime::get_resolve_static_call_stub(); | |
| 547 } | |
| 548 | |
| 549 bool CompiledStaticCall::is_call_to_compiled() const { | |
| 550 return CodeCache::contains(destination()); | |
| 551 } | |
| 552 | |
| 553 | |
| 554 bool CompiledStaticCall::is_call_to_interpreted() const { | |
| 555 // It is a call to interpreted, if it calls to a stub. Hence, the destination | |
| 556 // must be in the stub part of the nmethod that contains the call | |
| 557 nmethod* nm = CodeCache::find_nmethod(instruction_address()); | |
| 558 return nm->stub_contains(destination()); | |
| 559 } | |
| 560 | |
| 561 | |
| 562 void CompiledStaticCall::set_to_interpreted(methodHandle callee, address entry) { | |
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563 set_destination_mt_safe(entry); |
| 0 | 564 address stub=find_stub(); |
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565 #ifdef GRAAL |
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566 if (stub == NULL) { |
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567 return; |
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568 } |
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569 #endif |
| 0 | 570 assert(stub!=NULL, "stub not found"); |
| 571 | |
| 572 if (TraceICs) { | |
| 573 ResourceMark rm; | |
| 574 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s", | |
| 575 instruction_address(), | |
| 576 callee->name_and_sig_as_C_string()); | |
| 577 } | |
| 578 | |
| 579 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); // creation also verifies the object | |
| 580 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); | |
| 581 | |
| 582 assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee(), "a) MT-unsafe modification of inline cache"); | |
| 583 assert(jump->jump_destination() == (address)-1 || jump->jump_destination() == entry, "b) MT-unsafe modification of inline cache"); | |
| 584 | |
| 585 // Update stub | |
| 586 method_holder->set_data((intptr_t)callee()); | |
| 587 jump->set_jump_destination(entry); | |
| 588 | |
| 589 // Update jump to call | |
| 590 set_destination_mt_safe(stub); | |
| 591 } | |
| 592 | |
| 593 | |
| 594 void CompiledStaticCall::set(const StaticCallInfo& info) { | |
| 595 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); | |
| 596 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); | |
| 597 // Updating a cache to the wrong entry can cause bugs that are very hard | |
| 598 // to track down - if cache entry gets invalid - we just clean it. In | |
| 599 // this way it is always the same code path that is responsible for | |
| 600 // updating and resolving an inline cache | |
| 601 assert(is_clean(), "do not update a call entry - use clean"); | |
| 602 | |
| 603 if (info._to_interpreter) { | |
| 604 // Call to interpreted code | |
| 605 set_to_interpreted(info.callee(), info.entry()); | |
| 606 } else { | |
| 607 if (TraceICs) { | |
| 608 ResourceMark rm; | |
| 609 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_compiled " INTPTR_FORMAT, | |
| 610 instruction_address(), | |
| 611 info.entry()); | |
| 612 } | |
| 613 // Call to compiled code | |
| 614 assert (CodeCache::contains(info.entry()), "wrong entry point"); | |
| 615 set_destination_mt_safe(info.entry()); | |
| 616 } | |
| 617 } | |
| 618 | |
| 619 | |
| 620 // Compute settings for a CompiledStaticCall. Since we might have to set | |
| 621 // the stub when calling to the interpreter, we need to return arguments. | |
| 622 void CompiledStaticCall::compute_entry(methodHandle m, StaticCallInfo& info) { | |
| 623 nmethod* m_code = m->code(); | |
| 624 info._callee = m; | |
| 625 if (m_code != NULL) { | |
| 626 info._to_interpreter = false; | |
| 627 info._entry = m_code->verified_entry_point(); | |
| 628 } else { | |
| 629 // Callee is interpreted code. In any case entering the interpreter | |
| 630 // puts a converter-frame on the stack to save arguments. | |
| 631 info._to_interpreter = true; | |
| 632 info._entry = m()->get_c2i_entry(); | |
| 633 } | |
| 634 } | |
| 635 | |
| 636 | |
| 637 void CompiledStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) { | |
| 638 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); | |
| 639 // Reset stub | |
| 640 address stub = static_stub->addr(); | |
| 641 assert(stub!=NULL, "stub not found"); | |
| 642 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); // creation also verifies the object | |
| 643 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); | |
| 644 method_holder->set_data(0); | |
| 645 jump->set_jump_destination((address)-1); | |
| 646 } | |
| 647 | |
| 648 | |
| 649 address CompiledStaticCall::find_stub() { | |
| 650 // Find reloc. information containing this call-site | |
| 651 RelocIterator iter((nmethod*)NULL, instruction_address()); | |
| 652 while (iter.next()) { | |
| 653 if (iter.addr() == instruction_address()) { | |
| 654 switch(iter.type()) { | |
| 655 case relocInfo::static_call_type: | |
| 656 return iter.static_call_reloc()->static_stub(); | |
| 657 // We check here for opt_virtual_call_type, since we reuse the code | |
| 658 // from the CompiledIC implementation | |
| 659 case relocInfo::opt_virtual_call_type: | |
| 660 return iter.opt_virtual_call_reloc()->static_stub(); | |
| 661 case relocInfo::poll_type: | |
| 662 case relocInfo::poll_return_type: // A safepoint can't overlap a call. | |
| 663 default: | |
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664 #ifdef GRAAL |
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665 return NULL; |
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666 #else |
| 0 | 667 ShouldNotReachHere(); |
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668 #endif |
| 0 | 669 } |
| 670 } | |
| 671 } | |
| 672 return NULL; | |
| 673 } | |
| 674 | |
| 675 | |
| 676 //----------------------------------------------------------------------------- | |
| 677 // Non-product mode code | |
| 678 #ifndef PRODUCT | |
| 679 | |
| 680 void CompiledIC::verify() { | |
| 681 // make sure code pattern is actually a call imm32 instruction | |
| 682 _ic_call->verify(); | |
| 683 if (os::is_MP()) { | |
| 684 _ic_call->verify_alignment(); | |
| 685 } | |
| 686 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted() | |
| 687 || is_optimized() || is_megamorphic(), "sanity check"); | |
| 688 } | |
| 689 | |
| 690 | |
| 691 void CompiledIC::print() { | |
| 692 print_compiled_ic(); | |
| 693 tty->cr(); | |
| 694 } | |
| 695 | |
| 696 | |
| 697 void CompiledIC::print_compiled_ic() { | |
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698 tty->print("Inline cache at " INTPTR_FORMAT ", calling %s " INTPTR_FORMAT " cached_value " INTPTR_FORMAT, |
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699 instruction_address(), is_call_to_interpreted() ? "interpreted " : "", ic_destination(), is_optimized() ? NULL : cached_value()); |
| 0 | 700 } |
| 701 | |
| 702 | |
| 703 void CompiledStaticCall::print() { | |
| 704 tty->print("static call at " INTPTR_FORMAT " -> ", instruction_address()); | |
| 705 if (is_clean()) { | |
| 706 tty->print("clean"); | |
| 707 } else if (is_call_to_compiled()) { | |
| 708 tty->print("compiled"); | |
| 709 } else if (is_call_to_interpreted()) { | |
| 710 tty->print("interpreted"); | |
| 711 } | |
| 712 tty->cr(); | |
| 713 } | |
| 714 | |
| 715 void CompiledStaticCall::verify() { | |
| 716 // Verify call | |
| 717 NativeCall::verify(); | |
| 718 if (os::is_MP()) { | |
| 719 verify_alignment(); | |
| 720 } | |
| 721 | |
| 722 // Verify stub | |
| 723 address stub = find_stub(); | |
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724 #ifndef GRAAL |
| 0 | 725 assert(stub != NULL, "no stub found for static call"); |
| 726 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); // creation also verifies the object | |
| 727 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); | |
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728 #endif |
| 0 | 729 |
| 730 // Verify state | |
| 731 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check"); | |
| 732 } | |
| 733 | |
| 734 #endif |