Mercurial > hg > truffle
annotate src/share/vm/code/compiledIC.cpp @ 10408:836a62f43af9
Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/
| author | Doug Simon <doug.simon@oracle.com> |
|---|---|
| date | Wed, 19 Jun 2013 10:45:56 +0200 |
| parents | b9a918201d47 a6e09d6dd8e5 |
| children | cefad50507d8 |
| 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 | |
| 48 //----------------------------------------------------------------------------- | |
| 49 // Low-level access to an inline cache. Private, since they might not be | |
| 50 // MT-safe to use. | |
| 51 | |
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52 void* CompiledIC::cached_value() const { |
| 0 | 53 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
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54 assert (!is_optimized(), "an optimized virtual call does not have a cached metadata"); |
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55 |
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56 if (!is_in_transition_state()) { |
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57 void* data = (void*)_value->data(); |
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58 // If we let the metadata value here be initialized to zero... |
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59 assert(data != NULL || Universe::non_oop_word() == NULL, |
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60 "no raw nulls in CompiledIC metadatas, because of patching races"); |
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61 return (data == (void*)Universe::non_oop_word()) ? NULL : data; |
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62 } else { |
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63 return InlineCacheBuffer::cached_value_for((CompiledIC *)this); |
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64 } |
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65 } |
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66 |
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67 |
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68 void CompiledIC::internal_set_ic_destination(address entry_point, bool is_icstub, void* cache, bool is_icholder) { |
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69 assert(entry_point != NULL, "must set legal entry point"); |
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70 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
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71 assert (!is_optimized() || cache == NULL, "an optimized virtual call does not have a cached metadata"); |
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72 assert (cache == NULL || cache != (Metadata*)badOopVal, "invalid metadata"); |
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73 |
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74 assert(!is_icholder || is_icholder_entry(entry_point), "must be"); |
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75 |
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76 // Don't use ic_destination for this test since that forwards |
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77 // through ICBuffer instead of returning the actual current state of |
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78 // the CompiledIC. |
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79 if (is_icholder_entry(_ic_call->destination()) GRAAL_ONLY(&& _value != NULL)) { |
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80 // When patching for the ICStub case the cached value isn't |
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81 // overwritten until the ICStub copied into the CompiledIC during |
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82 // the next safepoint. Make sure that the CompiledICHolder* is |
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83 // marked for release at this point since it won't be identifiable |
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84 // once the entry point is overwritten. |
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85 InlineCacheBuffer::queue_for_release((CompiledICHolder*)_value->data()); |
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86 } |
| 0 | 87 |
| 88 if (TraceCompiledIC) { | |
| 89 tty->print(" "); | |
| 90 print_compiled_ic(); | |
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91 tty->print(" changing destination to " INTPTR_FORMAT, entry_point); |
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92 if (!is_optimized()) { |
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93 tty->print(" changing cached %s to " INTPTR_FORMAT, is_icholder ? "icholder" : "metadata", (address)cache); |
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94 } |
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95 if (is_icstub) { |
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96 tty->print(" (icstub)"); |
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97 } |
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98 tty->cr(); |
| 0 | 99 } |
| 100 | |
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101 { |
| 0 | 102 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); |
| 103 #ifdef ASSERT | |
| 104 CodeBlob* cb = CodeCache::find_blob_unsafe(_ic_call); | |
| 105 assert(cb != NULL && cb->is_nmethod(), "must be nmethod"); | |
| 106 #endif | |
| 107 _ic_call->set_destination_mt_safe(entry_point); | |
| 108 } | |
| 109 | |
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110 #ifdef GRAAL |
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111 if (_value == NULL) { |
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112 // Can happen when Graal converted a virtual call into an invoke special based on static analysis. |
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113 return; |
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114 } |
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115 #endif |
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116 |
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117 if (is_optimized() || is_icstub) { |
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118 // Optimized call sites don't have a cache value and ICStub call |
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119 // sites only change the entry point. Changing the value in that |
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120 // case could lead to MT safety issues. |
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121 assert(cache == NULL, "must be null"); |
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122 return; |
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123 } |
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124 |
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125 if (cache == NULL) cache = (void*)Universe::non_oop_word(); |
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126 |
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127 _value->set_data((intptr_t)cache); |
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128 } |
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129 |
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130 |
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131 void CompiledIC::set_ic_destination(ICStub* stub) { |
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132 internal_set_ic_destination(stub->code_begin(), true, NULL, false); |
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133 } |
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134 |
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135 |
| 0 | 136 |
| 137 address CompiledIC::ic_destination() const { | |
| 138 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
| 139 if (!is_in_transition_state()) { | |
| 140 return _ic_call->destination(); | |
| 141 } else { | |
| 142 return InlineCacheBuffer::ic_destination_for((CompiledIC *)this); | |
| 143 } | |
| 144 } | |
| 145 | |
| 146 | |
| 147 bool CompiledIC::is_in_transition_state() const { | |
| 148 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
| 149 return InlineCacheBuffer::contains(_ic_call->destination()); | |
| 150 } | |
| 151 | |
| 152 | |
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153 bool CompiledIC::is_icholder_call() const { |
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154 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
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155 return !_is_optimized && is_icholder_entry(ic_destination()); |
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156 } |
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157 |
| 0 | 158 // Returns native address of 'call' instruction in inline-cache. Used by |
| 159 // the InlineCacheBuffer when it needs to find the stub. | |
| 160 address CompiledIC::stub_address() const { | |
| 161 assert(is_in_transition_state(), "should only be called when we are in a transition state"); | |
| 162 return _ic_call->destination(); | |
| 163 } | |
| 164 | |
| 165 | |
| 166 //----------------------------------------------------------------------------- | |
| 167 // High-level access to an inline cache. Guaranteed to be MT-safe. | |
| 168 | |
| 169 | |
| 170 void CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS) { | |
| 171 methodHandle method = call_info->selected_method(); | |
| 172 bool is_invoke_interface = (bytecode == Bytecodes::_invokeinterface && !call_info->has_vtable_index()); | |
| 173 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
| 174 assert(!is_optimized(), "cannot set an optimized virtual call to megamorphic"); | |
| 175 assert(is_call_to_compiled() || is_call_to_interpreted(), "going directly to megamorphic?"); | |
| 176 | |
| 177 address entry; | |
| 178 if (is_invoke_interface) { | |
| 179 int index = klassItable::compute_itable_index(call_info->resolved_method()()); | |
| 180 entry = VtableStubs::create_stub(false, index, method()); | |
| 181 assert(entry != NULL, "entry not computed"); | |
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182 InstanceKlass* k = call_info->resolved_method()->method_holder(); |
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183 assert(k->is_interface(), "sanity check"); |
| 0 | 184 InlineCacheBuffer::create_transition_stub(this, k, entry); |
| 185 } else { | |
| 186 // Can be different than method->vtable_index(), due to package-private etc. | |
| 187 int vtable_index = call_info->vtable_index(); | |
| 188 entry = VtableStubs::create_stub(true, vtable_index, method()); | |
| 189 InlineCacheBuffer::create_transition_stub(this, method(), entry); | |
| 190 } | |
| 191 | |
| 192 if (TraceICs) { | |
| 193 ResourceMark rm; | |
| 194 tty->print_cr ("IC@" INTPTR_FORMAT ": to megamorphic %s entry: " INTPTR_FORMAT, | |
| 195 instruction_address(), method->print_value_string(), entry); | |
| 196 } | |
| 197 | |
| 198 // We can't check this anymore. With lazy deopt we could have already | |
| 199 // cleaned this IC entry before we even return. This is possible if | |
| 200 // we ran out of space in the inline cache buffer trying to do the | |
| 201 // set_next and we safepointed to free up space. This is a benign | |
| 202 // race because the IC entry was complete when we safepointed so | |
| 203 // cleaning it immediately is harmless. | |
| 204 // assert(is_megamorphic(), "sanity check"); | |
| 205 } | |
| 206 | |
| 207 | |
| 208 // true if destination is megamorphic stub | |
| 209 bool CompiledIC::is_megamorphic() const { | |
| 210 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
| 211 assert(!is_optimized(), "an optimized call cannot be megamorphic"); | |
| 212 | |
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213 // Cannot rely on cached_value. It is either an interface or a method. |
| 0 | 214 return VtableStubs::is_entry_point(ic_destination()); |
| 215 } | |
| 216 | |
| 217 bool CompiledIC::is_call_to_compiled() const { | |
| 218 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
| 219 | |
| 220 // Use unsafe, since an inline cache might point to a zombie method. However, the zombie | |
| 221 // method is guaranteed to still exist, since we only remove methods after all inline caches | |
| 222 // has been cleaned up | |
| 223 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination()); | |
| 224 bool is_monomorphic = (cb != NULL && cb->is_nmethod()); | |
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225 // Check that the cached_value is a klass for non-optimized monomorphic calls |
| 0 | 226 // This assertion is invalid for compiler1: a call that does not look optimized (no static stub) can be used |
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227 // for calling directly to vep without using the inline cache (i.e., cached_value == NULL) |
| 0 | 228 #ifdef ASSERT |
| 229 CodeBlob* caller = CodeCache::find_blob_unsafe(instruction_address()); | |
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230 bool is_c1_or_graal_method = caller->is_compiled_by_c1() || caller->is_compiled_by_graal(); |
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231 assert( is_c1_or_graal_method || |
| 0 | 232 !is_monomorphic || |
| 233 is_optimized() || | |
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234 (cached_metadata() != NULL && cached_metadata()->is_klass()), "sanity check"); |
| 0 | 235 #endif // ASSERT |
| 236 return is_monomorphic; | |
| 237 } | |
| 238 | |
| 239 | |
| 240 bool CompiledIC::is_call_to_interpreted() const { | |
| 241 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
| 242 // Call to interpreter if destination is either calling to a stub (if it | |
| 243 // is optimized), or calling to an I2C blob | |
| 244 bool is_call_to_interpreted = false; | |
| 245 if (!is_optimized()) { | |
| 246 // must use unsafe because the destination can be a zombie (and we're cleaning) | |
| 247 // and the print_compiled_ic code wants to know if site (in the non-zombie) | |
| 248 // is to the interpreter. | |
| 249 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination()); | |
| 250 is_call_to_interpreted = (cb != NULL && cb->is_adapter_blob()); | |
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251 assert(!is_call_to_interpreted || (is_icholder_call() && cached_icholder() != NULL), "sanity check"); |
| 0 | 252 } else { |
| 253 // Check if we are calling into our own codeblob (i.e., to a stub) | |
| 254 CodeBlob* cb = CodeCache::find_blob(_ic_call->instruction_address()); | |
| 255 address dest = ic_destination(); | |
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256 #ifndef GRAAL |
| 0 | 257 #ifdef ASSERT |
| 258 { | |
| 259 CodeBlob* db = CodeCache::find_blob_unsafe(dest); | |
| 260 assert(!db->is_adapter_blob(), "must use stub!"); | |
| 261 } | |
| 262 #endif /* ASSERT */ | |
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263 #endif |
| 0 | 264 is_call_to_interpreted = cb->contains(dest); |
| 265 } | |
| 266 return is_call_to_interpreted; | |
| 267 } | |
| 268 | |
| 269 | |
| 270 void CompiledIC::set_to_clean() { | |
| 271 assert(SafepointSynchronize::is_at_safepoint() || CompiledIC_lock->is_locked() , "MT-unsafe call"); | |
| 272 if (TraceInlineCacheClearing || TraceICs) { | |
| 273 tty->print_cr("IC@" INTPTR_FORMAT ": set to clean", instruction_address()); | |
| 274 print(); | |
| 275 } | |
| 276 | |
| 277 address entry; | |
| 278 if (is_optimized()) { | |
| 279 entry = SharedRuntime::get_resolve_opt_virtual_call_stub(); | |
| 280 } else { | |
| 281 entry = SharedRuntime::get_resolve_virtual_call_stub(); | |
| 282 } | |
| 283 | |
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284 // A zombie transition will always be safe, since the metadata has already been set to NULL, so |
| 0 | 285 // we only need to patch the destination |
| 286 bool safe_transition = is_optimized() || SafepointSynchronize::is_at_safepoint(); | |
| 287 | |
| 288 if (safe_transition) { | |
| 289 // Kill any leftover stub we might have too | |
| 290 if (is_in_transition_state()) { | |
| 291 ICStub* old_stub = ICStub_from_destination_address(stub_address()); | |
| 292 old_stub->clear(); | |
| 293 } | |
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294 if (is_optimized()) { |
| 0 | 295 set_ic_destination(entry); |
| 296 } else { | |
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297 set_ic_destination_and_value(entry, (void*)NULL); |
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298 } |
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299 } else { |
| 0 | 300 // Unsafe transition - create stub. |
| 301 InlineCacheBuffer::create_transition_stub(this, NULL, entry); | |
| 302 } | |
| 303 // We can't check this anymore. With lazy deopt we could have already | |
| 304 // cleaned this IC entry before we even return. This is possible if | |
| 305 // we ran out of space in the inline cache buffer trying to do the | |
| 306 // set_next and we safepointed to free up space. This is a benign | |
| 307 // race because the IC entry was complete when we safepointed so | |
| 308 // cleaning it immediately is harmless. | |
| 309 // assert(is_clean(), "sanity check"); | |
| 310 } | |
| 311 | |
| 312 | |
| 313 bool CompiledIC::is_clean() const { | |
| 314 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
| 315 bool is_clean = false; | |
| 316 address dest = ic_destination(); | |
| 317 is_clean = dest == SharedRuntime::get_resolve_opt_virtual_call_stub() || | |
| 318 dest == SharedRuntime::get_resolve_virtual_call_stub(); | |
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319 assert(!is_clean || is_optimized() || cached_value() == NULL, "sanity check"); |
| 0 | 320 return is_clean; |
| 321 } | |
| 322 | |
| 323 | |
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324 void CompiledIC::set_to_monomorphic(CompiledICInfo& info) { |
| 0 | 325 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
| 326 // Updating a cache to the wrong entry can cause bugs that are very hard | |
| 327 // to track down - if cache entry gets invalid - we just clean it. In | |
| 328 // this way it is always the same code path that is responsible for | |
| 329 // updating and resolving an inline cache | |
| 330 // | |
| 331 // The above is no longer true. SharedRuntime::fixup_callers_callsite will change optimized | |
| 332 // callsites. In addition ic_miss code will update a site to monomorphic if it determines | |
| 333 // that an monomorphic call to the interpreter can now be monomorphic to compiled code. | |
| 334 // | |
| 335 // In both of these cases the only thing being modifed is the jump/call target and these | |
| 336 // transitions are mt_safe | |
| 337 | |
| 338 Thread *thread = Thread::current(); | |
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339 if (info.to_interpreter()) { |
| 0 | 340 // Call to interpreter |
| 341 if (info.is_optimized() && is_optimized()) { | |
| 342 assert(is_clean(), "unsafe IC path"); | |
| 343 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); | |
| 344 // the call analysis (callee structure) specifies that the call is optimized | |
| 345 // (either because of CHA or the static target is final) | |
| 346 // At code generation time, this call has been emitted as static call | |
| 347 // Call via stub | |
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348 assert(info.cached_metadata() != NULL && info.cached_metadata()->is_method(), "sanity check"); |
| 0 | 349 CompiledStaticCall* csc = compiledStaticCall_at(instruction_address()); |
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350 methodHandle method (thread, (Method*)info.cached_metadata()); |
| 0 | 351 csc->set_to_interpreted(method, info.entry()); |
| 352 if (TraceICs) { | |
| 353 ResourceMark rm(thread); | |
| 354 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter: %s", | |
| 355 instruction_address(), | |
| 356 method->print_value_string()); | |
| 357 } | |
| 358 } else { | |
| 359 // Call via method-klass-holder | |
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360 InlineCacheBuffer::create_transition_stub(this, info.claim_cached_icholder(), info.entry()); |
| 0 | 361 if (TraceICs) { |
| 362 ResourceMark rm(thread); | |
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363 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter via icholder ", instruction_address()); |
| 0 | 364 } |
| 365 } | |
| 366 } else { | |
| 367 // Call to compiled code | |
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368 bool static_bound = info.is_optimized() || (info.cached_metadata() == NULL); |
| 0 | 369 #ifdef ASSERT |
| 370 CodeBlob* cb = CodeCache::find_blob_unsafe(info.entry()); | |
| 371 assert (cb->is_nmethod(), "must be compiled!"); | |
| 372 #endif /* ASSERT */ | |
| 373 | |
| 374 // This is MT safe if we come from a clean-cache and go through a | |
| 375 // non-verified entry point | |
| 376 bool safe = SafepointSynchronize::is_at_safepoint() || | |
| 377 (!is_in_transition_state() && (info.is_optimized() || static_bound || is_clean())); | |
| 378 | |
| 379 if (!safe) { | |
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380 InlineCacheBuffer::create_transition_stub(this, info.cached_metadata(), info.entry()); |
| 0 | 381 } else { |
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382 if (is_optimized()) { |
| 0 | 383 set_ic_destination(info.entry()); |
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384 } else { |
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385 set_ic_destination_and_value(info.entry(), info.cached_metadata()); |
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386 } |
| 0 | 387 } |
| 388 | |
| 389 if (TraceICs) { | |
| 390 ResourceMark rm(thread); | |
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391 assert(info.cached_metadata() == NULL || info.cached_metadata()->is_klass(), "must be"); |
| 0 | 392 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to compiled (rcvr klass) %s: %s", |
| 393 instruction_address(), | |
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394 ((Klass*)info.cached_metadata())->print_value_string(), |
| 0 | 395 (safe) ? "" : "via stub"); |
| 396 } | |
| 397 } | |
| 398 // We can't check this anymore. With lazy deopt we could have already | |
| 399 // cleaned this IC entry before we even return. This is possible if | |
| 400 // we ran out of space in the inline cache buffer trying to do the | |
| 401 // set_next and we safepointed to free up space. This is a benign | |
| 402 // race because the IC entry was complete when we safepointed so | |
| 403 // cleaning it immediately is harmless. | |
| 404 // assert(is_call_to_compiled() || is_call_to_interpreted(), "sanity check"); | |
| 405 } | |
| 406 | |
| 407 | |
| 408 // is_optimized: Compiler has generated an optimized call (i.e., no inline | |
| 409 // cache) static_bound: The call can be static bound (i.e, no need to use | |
| 410 // inline cache) | |
| 411 void CompiledIC::compute_monomorphic_entry(methodHandle method, | |
| 412 KlassHandle receiver_klass, | |
| 413 bool is_optimized, | |
| 414 bool static_bound, | |
| 415 CompiledICInfo& info, | |
| 416 TRAPS) { | |
| 417 nmethod* method_code = method->code(); | |
| 418 address entry = NULL; | |
| 419 if (method_code != NULL) { | |
| 420 // Call to compiled code | |
| 421 if (static_bound || is_optimized) { | |
| 422 entry = method_code->verified_entry_point(); | |
| 423 } else { | |
| 424 entry = method_code->entry_point(); | |
| 425 } | |
| 426 } | |
| 427 if (entry != NULL) { | |
| 428 // Call to compiled code | |
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429 info.set_compiled_entry(entry, (static_bound || is_optimized) ? NULL : receiver_klass(), is_optimized); |
| 0 | 430 } else { |
| 431 // Note: the following problem exists with Compiler1: | |
| 432 // - at compile time we may or may not know if the destination is final | |
| 433 // - if we know that the destination is final, we will emit an optimized | |
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434 // virtual call (no inline cache), and need a Method* to make a call |
| 0 | 435 // to the interpreter |
| 436 // - if we do not know if the destination is final, we emit a standard | |
| 437 // virtual call, and use CompiledICHolder to call interpreted code | |
| 438 // (no static call stub has been generated) | |
| 439 // However in that case we will now notice it is static_bound | |
| 440 // and convert the call into what looks to be an optimized | |
| 441 // virtual call. This causes problems in verifying the IC because | |
| 442 // it look vanilla but is optimized. Code in is_call_to_interpreted | |
| 443 // is aware of this and weakens its asserts. | |
| 444 | |
| 445 // static_bound should imply is_optimized -- otherwise we have a | |
| 446 // performance bug (statically-bindable method is called via | |
| 447 // dynamically-dispatched call note: the reverse implication isn't | |
| 448 // necessarily true -- the call may have been optimized based on compiler | |
| 449 // analysis (static_bound is only based on "final" etc.) | |
| 450 #ifdef COMPILER2 | |
| 451 #ifdef TIERED | |
| 452 #if defined(ASSERT) | |
| 453 // can't check the assert because we don't have the CompiledIC with which to | |
| 454 // find the address if the call instruction. | |
| 455 // | |
| 456 // CodeBlob* cb = find_blob_unsafe(instruction_address()); | |
| 457 // assert(cb->is_compiled_by_c1() || !static_bound || is_optimized, "static_bound should imply is_optimized"); | |
| 458 #endif // ASSERT | |
| 459 #else | |
| 460 assert(!static_bound || is_optimized, "static_bound should imply is_optimized"); | |
| 461 #endif // TIERED | |
| 462 #endif // COMPILER2 | |
| 463 if (is_optimized) { | |
| 464 // Use stub entry | |
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465 info.set_interpreter_entry(method()->get_c2i_entry(), method()); |
| 0 | 466 } else { |
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467 // Use icholder entry |
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468 CompiledICHolder* holder = new CompiledICHolder(method(), receiver_klass()); |
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469 info.set_icholder_entry(method()->get_c2i_unverified_entry(), holder); |
| 0 | 470 } |
| 471 } | |
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472 assert(info.is_optimized() == is_optimized, "must agree"); |
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473 } |
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474 |
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475 |
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476 bool CompiledIC::is_icholder_entry(address entry) { |
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477 CodeBlob* cb = CodeCache::find_blob_unsafe(entry); |
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478 return (cb != NULL && cb->is_adapter_blob()); |
| 0 | 479 } |
| 480 | |
| 481 // ---------------------------------------------------------------------------- | |
| 482 | |
| 483 void CompiledStaticCall::set_to_clean() { | |
| 484 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); | |
| 485 // Reset call site | |
| 486 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); | |
| 487 #ifdef ASSERT | |
| 488 CodeBlob* cb = CodeCache::find_blob_unsafe(this); | |
| 489 assert(cb != NULL && cb->is_nmethod(), "must be nmethod"); | |
| 490 #endif | |
| 491 set_destination_mt_safe(SharedRuntime::get_resolve_static_call_stub()); | |
| 492 | |
| 493 // Do not reset stub here: It is too expensive to call find_stub. | |
| 494 // Instead, rely on caller (nmethod::clear_inline_caches) to clear | |
| 495 // both the call and its stub. | |
| 496 } | |
| 497 | |
| 498 | |
| 499 bool CompiledStaticCall::is_clean() const { | |
| 500 return destination() == SharedRuntime::get_resolve_static_call_stub(); | |
| 501 } | |
| 502 | |
| 503 bool CompiledStaticCall::is_call_to_compiled() const { | |
| 504 return CodeCache::contains(destination()); | |
| 505 } | |
| 506 | |
| 507 | |
| 508 bool CompiledStaticCall::is_call_to_interpreted() const { | |
| 509 // It is a call to interpreted, if it calls to a stub. Hence, the destination | |
| 510 // must be in the stub part of the nmethod that contains the call | |
| 511 nmethod* nm = CodeCache::find_nmethod(instruction_address()); | |
| 512 return nm->stub_contains(destination()); | |
| 513 } | |
| 514 | |
| 515 void CompiledStaticCall::set(const StaticCallInfo& info) { | |
| 516 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); | |
| 517 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); | |
| 518 // Updating a cache to the wrong entry can cause bugs that are very hard | |
| 519 // to track down - if cache entry gets invalid - we just clean it. In | |
| 520 // this way it is always the same code path that is responsible for | |
| 521 // updating and resolving an inline cache | |
| 522 assert(is_clean(), "do not update a call entry - use clean"); | |
| 523 | |
| 524 if (info._to_interpreter) { | |
| 525 // Call to interpreted code | |
| 526 set_to_interpreted(info.callee(), info.entry()); | |
| 527 } else { | |
| 528 if (TraceICs) { | |
| 529 ResourceMark rm; | |
| 530 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_compiled " INTPTR_FORMAT, | |
| 531 instruction_address(), | |
| 532 info.entry()); | |
| 533 } | |
| 534 // Call to compiled code | |
| 535 assert (CodeCache::contains(info.entry()), "wrong entry point"); | |
| 536 set_destination_mt_safe(info.entry()); | |
| 537 } | |
| 538 } | |
| 539 | |
| 540 | |
| 541 // Compute settings for a CompiledStaticCall. Since we might have to set | |
| 542 // the stub when calling to the interpreter, we need to return arguments. | |
| 543 void CompiledStaticCall::compute_entry(methodHandle m, StaticCallInfo& info) { | |
| 544 nmethod* m_code = m->code(); | |
| 545 info._callee = m; | |
| 546 if (m_code != NULL) { | |
| 547 info._to_interpreter = false; | |
| 548 info._entry = m_code->verified_entry_point(); | |
| 549 } else { | |
| 550 // Callee is interpreted code. In any case entering the interpreter | |
| 551 // puts a converter-frame on the stack to save arguments. | |
| 552 info._to_interpreter = true; | |
| 553 info._entry = m()->get_c2i_entry(); | |
| 554 } | |
| 555 } | |
| 556 | |
| 557 address CompiledStaticCall::find_stub() { | |
| 558 // Find reloc. information containing this call-site | |
| 559 RelocIterator iter((nmethod*)NULL, instruction_address()); | |
| 560 while (iter.next()) { | |
| 561 if (iter.addr() == instruction_address()) { | |
| 562 switch(iter.type()) { | |
| 563 case relocInfo::static_call_type: | |
| 564 return iter.static_call_reloc()->static_stub(); | |
| 565 // We check here for opt_virtual_call_type, since we reuse the code | |
| 566 // from the CompiledIC implementation | |
| 567 case relocInfo::opt_virtual_call_type: | |
| 568 return iter.opt_virtual_call_reloc()->static_stub(); | |
| 569 case relocInfo::poll_type: | |
| 570 case relocInfo::poll_return_type: // A safepoint can't overlap a call. | |
| 571 default: | |
| 572 ShouldNotReachHere(); | |
| 573 } | |
| 574 } | |
| 575 } | |
| 576 return NULL; | |
| 577 } | |
| 578 | |
| 579 | |
| 580 //----------------------------------------------------------------------------- | |
| 581 // Non-product mode code | |
| 582 #ifndef PRODUCT | |
| 583 | |
| 584 void CompiledIC::verify() { | |
| 585 // make sure code pattern is actually a call imm32 instruction | |
| 586 _ic_call->verify(); | |
| 587 if (os::is_MP()) { | |
| 588 _ic_call->verify_alignment(); | |
| 589 } | |
| 590 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted() | |
| 591 || is_optimized() || is_megamorphic(), "sanity check"); | |
| 592 } | |
| 593 | |
| 594 void CompiledIC::print() { | |
| 595 print_compiled_ic(); | |
| 596 tty->cr(); | |
| 597 } | |
| 598 | |
| 599 void CompiledIC::print_compiled_ic() { | |
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600 tty->print("Inline cache at " INTPTR_FORMAT ", calling %s " INTPTR_FORMAT " cached_value " INTPTR_FORMAT, |
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601 instruction_address(), is_call_to_interpreted() ? "interpreted " : "", ic_destination(), is_optimized() ? NULL : cached_value()); |
| 0 | 602 } |
| 603 | |
| 604 void CompiledStaticCall::print() { | |
| 605 tty->print("static call at " INTPTR_FORMAT " -> ", instruction_address()); | |
| 606 if (is_clean()) { | |
| 607 tty->print("clean"); | |
| 608 } else if (is_call_to_compiled()) { | |
| 609 tty->print("compiled"); | |
| 610 } else if (is_call_to_interpreted()) { | |
| 611 tty->print("interpreted"); | |
| 612 } | |
| 613 tty->cr(); | |
| 614 } | |
| 615 | |
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616 #endif // !PRODUCT |