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annotate src/share/vm/code/compiledIC.cpp @ 12681:343477cb53ff
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author | Christos Kotselidis <christos.kotselidis@oracle.com> |
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date | Tue, 05 Nov 2013 19:02:14 +0100 |
parents | cefad50507d8 |
children | 02f27ecb4f3a |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, 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 | |
12294 | 170 bool CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS) { |
0 | 171 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
172 assert(!is_optimized(), "cannot set an optimized virtual call to megamorphic"); | |
173 assert(is_call_to_compiled() || is_call_to_interpreted(), "going directly to megamorphic?"); | |
174 | |
175 address entry; | |
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176 if (call_info->call_kind() == CallInfo::itable_call) { |
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177 assert(bytecode == Bytecodes::_invokeinterface, ""); |
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178 int itable_index = call_info->itable_index(); |
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179 entry = VtableStubs::find_itable_stub(itable_index); |
12294 | 180 if (entry == false) { |
181 return false; | |
182 } | |
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183 #ifdef ASSERT |
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184 int index = call_info->resolved_method()->itable_index(); |
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185 assert(index == itable_index, "CallInfo pre-computes this"); |
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186 #endif //ASSERT |
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187 InstanceKlass* k = call_info->resolved_method()->method_holder(); |
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188 assert(k->verify_itable_index(itable_index), "sanity check"); |
0 | 189 InlineCacheBuffer::create_transition_stub(this, k, entry); |
190 } else { | |
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191 assert(call_info->call_kind() == CallInfo::vtable_call, "either itable or vtable"); |
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192 // Can be different than selected_method->vtable_index(), due to package-private etc. |
0 | 193 int vtable_index = call_info->vtable_index(); |
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194 assert(call_info->resolved_klass()->verify_vtable_index(vtable_index), "sanity check"); |
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195 entry = VtableStubs::find_vtable_stub(vtable_index); |
12294 | 196 if (entry == NULL) { |
197 return false; | |
198 } | |
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199 InlineCacheBuffer::create_transition_stub(this, NULL, entry); |
0 | 200 } |
201 | |
202 if (TraceICs) { | |
203 ResourceMark rm; | |
204 tty->print_cr ("IC@" INTPTR_FORMAT ": to megamorphic %s entry: " INTPTR_FORMAT, | |
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205 instruction_address(), call_info->selected_method()->print_value_string(), entry); |
0 | 206 } |
207 | |
208 // We can't check this anymore. With lazy deopt we could have already | |
209 // cleaned this IC entry before we even return. This is possible if | |
210 // we ran out of space in the inline cache buffer trying to do the | |
211 // set_next and we safepointed to free up space. This is a benign | |
212 // race because the IC entry was complete when we safepointed so | |
213 // cleaning it immediately is harmless. | |
214 // assert(is_megamorphic(), "sanity check"); | |
12294 | 215 return true; |
0 | 216 } |
217 | |
218 | |
219 // true if destination is megamorphic stub | |
220 bool CompiledIC::is_megamorphic() const { | |
221 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
222 assert(!is_optimized(), "an optimized call cannot be megamorphic"); | |
223 | |
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224 // Cannot rely on cached_value. It is either an interface or a method. |
0 | 225 return VtableStubs::is_entry_point(ic_destination()); |
226 } | |
227 | |
228 bool CompiledIC::is_call_to_compiled() const { | |
229 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
230 | |
231 // Use unsafe, since an inline cache might point to a zombie method. However, the zombie | |
232 // method is guaranteed to still exist, since we only remove methods after all inline caches | |
233 // has been cleaned up | |
234 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination()); | |
235 bool is_monomorphic = (cb != NULL && cb->is_nmethod()); | |
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236 // Check that the cached_value is a klass for non-optimized monomorphic calls |
0 | 237 // This assertion is invalid for compiler1: a call that does not look optimized (no static stub) can be used |
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238 // for calling directly to vep without using the inline cache (i.e., cached_value == NULL) |
0 | 239 #ifdef ASSERT |
240 CodeBlob* caller = CodeCache::find_blob_unsafe(instruction_address()); | |
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241 bool is_c1_or_graal_method = caller->is_compiled_by_c1() || caller->is_compiled_by_graal(); |
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242 assert( is_c1_or_graal_method || |
0 | 243 !is_monomorphic || |
244 is_optimized() || | |
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245 (cached_metadata() != NULL && cached_metadata()->is_klass()), "sanity check"); |
0 | 246 #endif // ASSERT |
247 return is_monomorphic; | |
248 } | |
249 | |
250 | |
251 bool CompiledIC::is_call_to_interpreted() const { | |
252 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
253 // Call to interpreter if destination is either calling to a stub (if it | |
254 // is optimized), or calling to an I2C blob | |
255 bool is_call_to_interpreted = false; | |
256 if (!is_optimized()) { | |
257 // must use unsafe because the destination can be a zombie (and we're cleaning) | |
258 // and the print_compiled_ic code wants to know if site (in the non-zombie) | |
259 // is to the interpreter. | |
260 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination()); | |
261 is_call_to_interpreted = (cb != NULL && cb->is_adapter_blob()); | |
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262 assert(!is_call_to_interpreted || (is_icholder_call() && cached_icholder() != NULL), "sanity check"); |
0 | 263 } else { |
264 // Check if we are calling into our own codeblob (i.e., to a stub) | |
265 CodeBlob* cb = CodeCache::find_blob(_ic_call->instruction_address()); | |
266 address dest = ic_destination(); | |
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267 #ifndef GRAAL |
0 | 268 #ifdef ASSERT |
269 { | |
270 CodeBlob* db = CodeCache::find_blob_unsafe(dest); | |
271 assert(!db->is_adapter_blob(), "must use stub!"); | |
272 } | |
273 #endif /* ASSERT */ | |
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274 #endif |
0 | 275 is_call_to_interpreted = cb->contains(dest); |
276 } | |
277 return is_call_to_interpreted; | |
278 } | |
279 | |
280 | |
281 void CompiledIC::set_to_clean() { | |
282 assert(SafepointSynchronize::is_at_safepoint() || CompiledIC_lock->is_locked() , "MT-unsafe call"); | |
283 if (TraceInlineCacheClearing || TraceICs) { | |
284 tty->print_cr("IC@" INTPTR_FORMAT ": set to clean", instruction_address()); | |
285 print(); | |
286 } | |
287 | |
288 address entry; | |
289 if (is_optimized()) { | |
290 entry = SharedRuntime::get_resolve_opt_virtual_call_stub(); | |
291 } else { | |
292 entry = SharedRuntime::get_resolve_virtual_call_stub(); | |
293 } | |
294 | |
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295 // A zombie transition will always be safe, since the metadata has already been set to NULL, so |
0 | 296 // we only need to patch the destination |
297 bool safe_transition = is_optimized() || SafepointSynchronize::is_at_safepoint(); | |
298 | |
299 if (safe_transition) { | |
300 // Kill any leftover stub we might have too | |
301 if (is_in_transition_state()) { | |
302 ICStub* old_stub = ICStub_from_destination_address(stub_address()); | |
303 old_stub->clear(); | |
304 } | |
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305 if (is_optimized()) { |
0 | 306 set_ic_destination(entry); |
307 } else { | |
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308 set_ic_destination_and_value(entry, (void*)NULL); |
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309 } |
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310 } else { |
0 | 311 // Unsafe transition - create stub. |
312 InlineCacheBuffer::create_transition_stub(this, NULL, entry); | |
313 } | |
314 // We can't check this anymore. With lazy deopt we could have already | |
315 // cleaned this IC entry before we even return. This is possible if | |
316 // we ran out of space in the inline cache buffer trying to do the | |
317 // set_next and we safepointed to free up space. This is a benign | |
318 // race because the IC entry was complete when we safepointed so | |
319 // cleaning it immediately is harmless. | |
320 // assert(is_clean(), "sanity check"); | |
321 } | |
322 | |
323 | |
324 bool CompiledIC::is_clean() const { | |
325 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
326 bool is_clean = false; | |
327 address dest = ic_destination(); | |
328 is_clean = dest == SharedRuntime::get_resolve_opt_virtual_call_stub() || | |
329 dest == SharedRuntime::get_resolve_virtual_call_stub(); | |
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330 assert(!is_clean || is_optimized() || cached_value() == NULL, "sanity check"); |
0 | 331 return is_clean; |
332 } | |
333 | |
334 | |
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335 void CompiledIC::set_to_monomorphic(CompiledICInfo& info) { |
0 | 336 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
337 // Updating a cache to the wrong entry can cause bugs that are very hard | |
338 // to track down - if cache entry gets invalid - we just clean it. In | |
339 // this way it is always the same code path that is responsible for | |
340 // updating and resolving an inline cache | |
341 // | |
342 // The above is no longer true. SharedRuntime::fixup_callers_callsite will change optimized | |
343 // callsites. In addition ic_miss code will update a site to monomorphic if it determines | |
344 // that an monomorphic call to the interpreter can now be monomorphic to compiled code. | |
345 // | |
346 // In both of these cases the only thing being modifed is the jump/call target and these | |
347 // transitions are mt_safe | |
348 | |
349 Thread *thread = Thread::current(); | |
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350 if (info.to_interpreter()) { |
0 | 351 // Call to interpreter |
352 if (info.is_optimized() && is_optimized()) { | |
353 assert(is_clean(), "unsafe IC path"); | |
354 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); | |
355 // the call analysis (callee structure) specifies that the call is optimized | |
356 // (either because of CHA or the static target is final) | |
357 // At code generation time, this call has been emitted as static call | |
358 // Call via stub | |
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359 assert(info.cached_metadata() != NULL && info.cached_metadata()->is_method(), "sanity check"); |
0 | 360 CompiledStaticCall* csc = compiledStaticCall_at(instruction_address()); |
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361 methodHandle method (thread, (Method*)info.cached_metadata()); |
0 | 362 csc->set_to_interpreted(method, info.entry()); |
363 if (TraceICs) { | |
364 ResourceMark rm(thread); | |
365 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter: %s", | |
366 instruction_address(), | |
367 method->print_value_string()); | |
368 } | |
369 } else { | |
370 // Call via method-klass-holder | |
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371 InlineCacheBuffer::create_transition_stub(this, info.claim_cached_icholder(), info.entry()); |
0 | 372 if (TraceICs) { |
373 ResourceMark rm(thread); | |
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374 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter via icholder ", instruction_address()); |
0 | 375 } |
376 } | |
377 } else { | |
378 // Call to compiled code | |
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379 bool static_bound = info.is_optimized() || (info.cached_metadata() == NULL); |
0 | 380 #ifdef ASSERT |
381 CodeBlob* cb = CodeCache::find_blob_unsafe(info.entry()); | |
382 assert (cb->is_nmethod(), "must be compiled!"); | |
383 #endif /* ASSERT */ | |
384 | |
385 // This is MT safe if we come from a clean-cache and go through a | |
386 // non-verified entry point | |
387 bool safe = SafepointSynchronize::is_at_safepoint() || | |
388 (!is_in_transition_state() && (info.is_optimized() || static_bound || is_clean())); | |
389 | |
390 if (!safe) { | |
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391 InlineCacheBuffer::create_transition_stub(this, info.cached_metadata(), info.entry()); |
0 | 392 } else { |
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393 if (is_optimized()) { |
0 | 394 set_ic_destination(info.entry()); |
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395 } else { |
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396 set_ic_destination_and_value(info.entry(), info.cached_metadata()); |
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397 } |
0 | 398 } |
399 | |
400 if (TraceICs) { | |
401 ResourceMark rm(thread); | |
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402 assert(info.cached_metadata() == NULL || info.cached_metadata()->is_klass(), "must be"); |
0 | 403 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to compiled (rcvr klass) %s: %s", |
404 instruction_address(), | |
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405 ((Klass*)info.cached_metadata())->print_value_string(), |
0 | 406 (safe) ? "" : "via stub"); |
407 } | |
408 } | |
409 // We can't check this anymore. With lazy deopt we could have already | |
410 // cleaned this IC entry before we even return. This is possible if | |
411 // we ran out of space in the inline cache buffer trying to do the | |
412 // set_next and we safepointed to free up space. This is a benign | |
413 // race because the IC entry was complete when we safepointed so | |
414 // cleaning it immediately is harmless. | |
415 // assert(is_call_to_compiled() || is_call_to_interpreted(), "sanity check"); | |
416 } | |
417 | |
418 | |
419 // is_optimized: Compiler has generated an optimized call (i.e., no inline | |
420 // cache) static_bound: The call can be static bound (i.e, no need to use | |
421 // inline cache) | |
422 void CompiledIC::compute_monomorphic_entry(methodHandle method, | |
423 KlassHandle receiver_klass, | |
424 bool is_optimized, | |
425 bool static_bound, | |
426 CompiledICInfo& info, | |
427 TRAPS) { | |
428 nmethod* method_code = method->code(); | |
429 address entry = NULL; | |
430 if (method_code != NULL) { | |
431 // Call to compiled code | |
432 if (static_bound || is_optimized) { | |
433 entry = method_code->verified_entry_point(); | |
434 } else { | |
435 entry = method_code->entry_point(); | |
436 } | |
437 } | |
438 if (entry != NULL) { | |
439 // Call to compiled code | |
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440 info.set_compiled_entry(entry, (static_bound || is_optimized) ? NULL : receiver_klass(), is_optimized); |
0 | 441 } else { |
442 // Note: the following problem exists with Compiler1: | |
443 // - at compile time we may or may not know if the destination is final | |
444 // - if we know that the destination is final, we will emit an optimized | |
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445 // virtual call (no inline cache), and need a Method* to make a call |
0 | 446 // to the interpreter |
447 // - if we do not know if the destination is final, we emit a standard | |
448 // virtual call, and use CompiledICHolder to call interpreted code | |
449 // (no static call stub has been generated) | |
450 // However in that case we will now notice it is static_bound | |
451 // and convert the call into what looks to be an optimized | |
452 // virtual call. This causes problems in verifying the IC because | |
453 // it look vanilla but is optimized. Code in is_call_to_interpreted | |
454 // is aware of this and weakens its asserts. | |
455 | |
456 // static_bound should imply is_optimized -- otherwise we have a | |
457 // performance bug (statically-bindable method is called via | |
458 // dynamically-dispatched call note: the reverse implication isn't | |
459 // necessarily true -- the call may have been optimized based on compiler | |
460 // analysis (static_bound is only based on "final" etc.) | |
461 #ifdef COMPILER2 | |
462 #ifdef TIERED | |
463 #if defined(ASSERT) | |
464 // can't check the assert because we don't have the CompiledIC with which to | |
465 // find the address if the call instruction. | |
466 // | |
467 // CodeBlob* cb = find_blob_unsafe(instruction_address()); | |
468 // assert(cb->is_compiled_by_c1() || !static_bound || is_optimized, "static_bound should imply is_optimized"); | |
469 #endif // ASSERT | |
470 #else | |
471 assert(!static_bound || is_optimized, "static_bound should imply is_optimized"); | |
472 #endif // TIERED | |
473 #endif // COMPILER2 | |
474 if (is_optimized) { | |
475 // Use stub entry | |
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476 info.set_interpreter_entry(method()->get_c2i_entry(), method()); |
0 | 477 } else { |
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478 // Use icholder entry |
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479 CompiledICHolder* holder = new CompiledICHolder(method(), receiver_klass()); |
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480 info.set_icholder_entry(method()->get_c2i_unverified_entry(), holder); |
0 | 481 } |
482 } | |
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483 assert(info.is_optimized() == is_optimized, "must agree"); |
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484 } |
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485 |
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486 |
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487 bool CompiledIC::is_icholder_entry(address entry) { |
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488 CodeBlob* cb = CodeCache::find_blob_unsafe(entry); |
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489 return (cb != NULL && cb->is_adapter_blob()); |
0 | 490 } |
491 | |
492 // ---------------------------------------------------------------------------- | |
493 | |
494 void CompiledStaticCall::set_to_clean() { | |
495 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); | |
496 // Reset call site | |
497 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); | |
498 #ifdef ASSERT | |
499 CodeBlob* cb = CodeCache::find_blob_unsafe(this); | |
500 assert(cb != NULL && cb->is_nmethod(), "must be nmethod"); | |
501 #endif | |
502 set_destination_mt_safe(SharedRuntime::get_resolve_static_call_stub()); | |
503 | |
504 // Do not reset stub here: It is too expensive to call find_stub. | |
505 // Instead, rely on caller (nmethod::clear_inline_caches) to clear | |
506 // both the call and its stub. | |
507 } | |
508 | |
509 | |
510 bool CompiledStaticCall::is_clean() const { | |
511 return destination() == SharedRuntime::get_resolve_static_call_stub(); | |
512 } | |
513 | |
514 bool CompiledStaticCall::is_call_to_compiled() const { | |
515 return CodeCache::contains(destination()); | |
516 } | |
517 | |
518 | |
519 bool CompiledStaticCall::is_call_to_interpreted() const { | |
520 // It is a call to interpreted, if it calls to a stub. Hence, the destination | |
521 // must be in the stub part of the nmethod that contains the call | |
522 nmethod* nm = CodeCache::find_nmethod(instruction_address()); | |
523 return nm->stub_contains(destination()); | |
524 } | |
525 | |
526 void CompiledStaticCall::set(const StaticCallInfo& info) { | |
527 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); | |
528 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); | |
529 // Updating a cache to the wrong entry can cause bugs that are very hard | |
530 // to track down - if cache entry gets invalid - we just clean it. In | |
531 // this way it is always the same code path that is responsible for | |
532 // updating and resolving an inline cache | |
533 assert(is_clean(), "do not update a call entry - use clean"); | |
534 | |
535 if (info._to_interpreter) { | |
536 // Call to interpreted code | |
537 set_to_interpreted(info.callee(), info.entry()); | |
538 } else { | |
539 if (TraceICs) { | |
540 ResourceMark rm; | |
541 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_compiled " INTPTR_FORMAT, | |
542 instruction_address(), | |
543 info.entry()); | |
544 } | |
545 // Call to compiled code | |
546 assert (CodeCache::contains(info.entry()), "wrong entry point"); | |
547 set_destination_mt_safe(info.entry()); | |
548 } | |
549 } | |
550 | |
551 | |
552 // Compute settings for a CompiledStaticCall. Since we might have to set | |
553 // the stub when calling to the interpreter, we need to return arguments. | |
554 void CompiledStaticCall::compute_entry(methodHandle m, StaticCallInfo& info) { | |
555 nmethod* m_code = m->code(); | |
556 info._callee = m; | |
557 if (m_code != NULL) { | |
558 info._to_interpreter = false; | |
559 info._entry = m_code->verified_entry_point(); | |
560 } else { | |
561 // Callee is interpreted code. In any case entering the interpreter | |
562 // puts a converter-frame on the stack to save arguments. | |
563 info._to_interpreter = true; | |
564 info._entry = m()->get_c2i_entry(); | |
565 } | |
566 } | |
567 | |
568 address CompiledStaticCall::find_stub() { | |
569 // Find reloc. information containing this call-site | |
570 RelocIterator iter((nmethod*)NULL, instruction_address()); | |
571 while (iter.next()) { | |
572 if (iter.addr() == instruction_address()) { | |
573 switch(iter.type()) { | |
574 case relocInfo::static_call_type: | |
575 return iter.static_call_reloc()->static_stub(); | |
576 // We check here for opt_virtual_call_type, since we reuse the code | |
577 // from the CompiledIC implementation | |
578 case relocInfo::opt_virtual_call_type: | |
579 return iter.opt_virtual_call_reloc()->static_stub(); | |
580 case relocInfo::poll_type: | |
581 case relocInfo::poll_return_type: // A safepoint can't overlap a call. | |
582 default: | |
583 ShouldNotReachHere(); | |
584 } | |
585 } | |
586 } | |
587 return NULL; | |
588 } | |
589 | |
590 | |
591 //----------------------------------------------------------------------------- | |
592 // Non-product mode code | |
593 #ifndef PRODUCT | |
594 | |
595 void CompiledIC::verify() { | |
596 // make sure code pattern is actually a call imm32 instruction | |
597 _ic_call->verify(); | |
598 if (os::is_MP()) { | |
599 _ic_call->verify_alignment(); | |
600 } | |
601 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted() | |
602 || is_optimized() || is_megamorphic(), "sanity check"); | |
603 } | |
604 | |
605 void CompiledIC::print() { | |
606 print_compiled_ic(); | |
607 tty->cr(); | |
608 } | |
609 | |
610 void CompiledIC::print_compiled_ic() { | |
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611 tty->print("Inline cache at " INTPTR_FORMAT ", calling %s " INTPTR_FORMAT " cached_value " INTPTR_FORMAT, |
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612 instruction_address(), is_call_to_interpreted() ? "interpreted " : "", ic_destination(), is_optimized() ? NULL : cached_value()); |
0 | 613 } |
614 | |
615 void CompiledStaticCall::print() { | |
616 tty->print("static call at " INTPTR_FORMAT " -> ", instruction_address()); | |
617 if (is_clean()) { | |
618 tty->print("clean"); | |
619 } else if (is_call_to_compiled()) { | |
620 tty->print("compiled"); | |
621 } else if (is_call_to_interpreted()) { | |
622 tty->print("interpreted"); | |
623 } | |
624 tty->cr(); | |
625 } | |
626 | |
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627 #endif // !PRODUCT |