Mercurial > hg > truffle
annotate src/share/vm/code/compiledIC.cpp @ 7421:ad5dd04754ee
8005031: Some cleanup in c2 to prepare for incremental inlining support
Summary: collection of small changes to prepare for incremental inlining.
Reviewed-by: twisti, kvn
author | roland |
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date | Tue, 18 Dec 2012 14:55:25 +0100 |
parents | 18fb7da42534 |
children | e522a00b91aa 41340544e182 |
rev | line source |
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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())) { |
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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 if (is_optimized() || is_icstub) { |
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130 // Optimized call sites don't have a cache value and ICStub call |
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131 // sites only change the entry point. Changing the value in that |
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132 // case could lead to MT safety issues. |
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133 assert(cache == NULL, "must be null"); |
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134 return; |
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135 } |
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136 |
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137 if (cache == NULL) cache = (void*)Universe::non_oop_word(); |
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138 |
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139 _value->set_data((intptr_t)cache); |
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140 } |
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141 |
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142 |
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143 void CompiledIC::set_ic_destination(ICStub* stub) { |
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144 internal_set_ic_destination(stub->code_begin(), true, NULL, false); |
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145 } |
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146 |
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147 |
0 | 148 |
149 address CompiledIC::ic_destination() const { | |
150 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
151 if (!is_in_transition_state()) { | |
152 return _ic_call->destination(); | |
153 } else { | |
154 return InlineCacheBuffer::ic_destination_for((CompiledIC *)this); | |
155 } | |
156 } | |
157 | |
158 | |
159 bool CompiledIC::is_in_transition_state() const { | |
160 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
161 return InlineCacheBuffer::contains(_ic_call->destination()); | |
162 } | |
163 | |
164 | |
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165 bool CompiledIC::is_icholder_call() const { |
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166 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
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167 return !_is_optimized && is_icholder_entry(ic_destination()); |
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168 } |
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169 |
0 | 170 // Returns native address of 'call' instruction in inline-cache. Used by |
171 // the InlineCacheBuffer when it needs to find the stub. | |
172 address CompiledIC::stub_address() const { | |
173 assert(is_in_transition_state(), "should only be called when we are in a transition state"); | |
174 return _ic_call->destination(); | |
175 } | |
176 | |
177 | |
178 //----------------------------------------------------------------------------- | |
179 // High-level access to an inline cache. Guaranteed to be MT-safe. | |
180 | |
181 | |
182 void CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS) { | |
183 methodHandle method = call_info->selected_method(); | |
184 bool is_invoke_interface = (bytecode == Bytecodes::_invokeinterface && !call_info->has_vtable_index()); | |
185 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
186 assert(!is_optimized(), "cannot set an optimized virtual call to megamorphic"); | |
187 assert(is_call_to_compiled() || is_call_to_interpreted(), "going directly to megamorphic?"); | |
188 | |
189 address entry; | |
190 if (is_invoke_interface) { | |
191 int index = klassItable::compute_itable_index(call_info->resolved_method()()); | |
192 entry = VtableStubs::create_stub(false, index, method()); | |
193 assert(entry != NULL, "entry not computed"); | |
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194 InstanceKlass* k = call_info->resolved_method()->method_holder(); |
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195 assert(k->is_interface(), "sanity check"); |
0 | 196 InlineCacheBuffer::create_transition_stub(this, k, entry); |
197 } else { | |
198 // Can be different than method->vtable_index(), due to package-private etc. | |
199 int vtable_index = call_info->vtable_index(); | |
200 entry = VtableStubs::create_stub(true, vtable_index, method()); | |
201 InlineCacheBuffer::create_transition_stub(this, method(), entry); | |
202 } | |
203 | |
204 if (TraceICs) { | |
205 ResourceMark rm; | |
206 tty->print_cr ("IC@" INTPTR_FORMAT ": to megamorphic %s entry: " INTPTR_FORMAT, | |
207 instruction_address(), method->print_value_string(), entry); | |
208 } | |
209 | |
210 // We can't check this anymore. With lazy deopt we could have already | |
211 // cleaned this IC entry before we even return. This is possible if | |
212 // we ran out of space in the inline cache buffer trying to do the | |
213 // set_next and we safepointed to free up space. This is a benign | |
214 // race because the IC entry was complete when we safepointed so | |
215 // cleaning it immediately is harmless. | |
216 // assert(is_megamorphic(), "sanity check"); | |
217 } | |
218 | |
219 | |
220 // true if destination is megamorphic stub | |
221 bool CompiledIC::is_megamorphic() const { | |
222 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
223 assert(!is_optimized(), "an optimized call cannot be megamorphic"); | |
224 | |
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225 // Cannot rely on cached_value. It is either an interface or a method. |
0 | 226 return VtableStubs::is_entry_point(ic_destination()); |
227 } | |
228 | |
229 bool CompiledIC::is_call_to_compiled() const { | |
230 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
231 | |
232 // Use unsafe, since an inline cache might point to a zombie method. However, the zombie | |
233 // method is guaranteed to still exist, since we only remove methods after all inline caches | |
234 // has been cleaned up | |
235 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination()); | |
236 bool is_monomorphic = (cb != NULL && cb->is_nmethod()); | |
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237 // Check that the cached_value is a klass for non-optimized monomorphic calls |
0 | 238 // This assertion is invalid for compiler1: a call that does not look optimized (no static stub) can be used |
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239 // for calling directly to vep without using the inline cache (i.e., cached_value == NULL) |
0 | 240 #ifdef ASSERT |
241 CodeBlob* caller = CodeCache::find_blob_unsafe(instruction_address()); | |
242 bool is_c1_method = caller->is_compiled_by_c1(); | |
243 assert( is_c1_method || | |
244 !is_monomorphic || | |
245 is_optimized() || | |
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246 (cached_metadata() != NULL && cached_metadata()->is_klass()), "sanity check"); |
0 | 247 #endif // ASSERT |
248 return is_monomorphic; | |
249 } | |
250 | |
251 | |
252 bool CompiledIC::is_call_to_interpreted() const { | |
253 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
254 // Call to interpreter if destination is either calling to a stub (if it | |
255 // is optimized), or calling to an I2C blob | |
256 bool is_call_to_interpreted = false; | |
257 if (!is_optimized()) { | |
258 // must use unsafe because the destination can be a zombie (and we're cleaning) | |
259 // and the print_compiled_ic code wants to know if site (in the non-zombie) | |
260 // is to the interpreter. | |
261 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination()); | |
262 is_call_to_interpreted = (cb != NULL && cb->is_adapter_blob()); | |
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263 assert(!is_call_to_interpreted || (is_icholder_call() && cached_icholder() != NULL), "sanity check"); |
0 | 264 } else { |
265 // Check if we are calling into our own codeblob (i.e., to a stub) | |
266 CodeBlob* cb = CodeCache::find_blob(_ic_call->instruction_address()); | |
267 address dest = ic_destination(); | |
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 */ | |
274 is_call_to_interpreted = cb->contains(dest); | |
275 } | |
276 return is_call_to_interpreted; | |
277 } | |
278 | |
279 | |
280 void CompiledIC::set_to_clean() { | |
281 assert(SafepointSynchronize::is_at_safepoint() || CompiledIC_lock->is_locked() , "MT-unsafe call"); | |
282 if (TraceInlineCacheClearing || TraceICs) { | |
283 tty->print_cr("IC@" INTPTR_FORMAT ": set to clean", instruction_address()); | |
284 print(); | |
285 } | |
286 | |
287 address entry; | |
288 if (is_optimized()) { | |
289 entry = SharedRuntime::get_resolve_opt_virtual_call_stub(); | |
290 } else { | |
291 entry = SharedRuntime::get_resolve_virtual_call_stub(); | |
292 } | |
293 | |
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294 // A zombie transition will always be safe, since the metadata has already been set to NULL, so |
0 | 295 // we only need to patch the destination |
296 bool safe_transition = is_optimized() || SafepointSynchronize::is_at_safepoint(); | |
297 | |
298 if (safe_transition) { | |
299 // Kill any leftover stub we might have too | |
300 if (is_in_transition_state()) { | |
301 ICStub* old_stub = ICStub_from_destination_address(stub_address()); | |
302 old_stub->clear(); | |
303 } | |
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304 if (is_optimized()) { |
0 | 305 set_ic_destination(entry); |
306 } else { | |
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307 set_ic_destination_and_value(entry, (void*)NULL); |
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308 } |
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309 } else { |
0 | 310 // Unsafe transition - create stub. |
311 InlineCacheBuffer::create_transition_stub(this, NULL, entry); | |
312 } | |
313 // We can't check this anymore. With lazy deopt we could have already | |
314 // cleaned this IC entry before we even return. This is possible if | |
315 // we ran out of space in the inline cache buffer trying to do the | |
316 // set_next and we safepointed to free up space. This is a benign | |
317 // race because the IC entry was complete when we safepointed so | |
318 // cleaning it immediately is harmless. | |
319 // assert(is_clean(), "sanity check"); | |
320 } | |
321 | |
322 | |
323 bool CompiledIC::is_clean() const { | |
324 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
325 bool is_clean = false; | |
326 address dest = ic_destination(); | |
327 is_clean = dest == SharedRuntime::get_resolve_opt_virtual_call_stub() || | |
328 dest == SharedRuntime::get_resolve_virtual_call_stub(); | |
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329 assert(!is_clean || is_optimized() || cached_value() == NULL, "sanity check"); |
0 | 330 return is_clean; |
331 } | |
332 | |
333 | |
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334 void CompiledIC::set_to_monomorphic(CompiledICInfo& info) { |
0 | 335 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
336 // Updating a cache to the wrong entry can cause bugs that are very hard | |
337 // to track down - if cache entry gets invalid - we just clean it. In | |
338 // this way it is always the same code path that is responsible for | |
339 // updating and resolving an inline cache | |
340 // | |
341 // The above is no longer true. SharedRuntime::fixup_callers_callsite will change optimized | |
342 // callsites. In addition ic_miss code will update a site to monomorphic if it determines | |
343 // that an monomorphic call to the interpreter can now be monomorphic to compiled code. | |
344 // | |
345 // In both of these cases the only thing being modifed is the jump/call target and these | |
346 // transitions are mt_safe | |
347 | |
348 Thread *thread = Thread::current(); | |
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349 if (info.to_interpreter()) { |
0 | 350 // Call to interpreter |
351 if (info.is_optimized() && is_optimized()) { | |
352 assert(is_clean(), "unsafe IC path"); | |
353 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); | |
354 // the call analysis (callee structure) specifies that the call is optimized | |
355 // (either because of CHA or the static target is final) | |
356 // At code generation time, this call has been emitted as static call | |
357 // Call via stub | |
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358 assert(info.cached_metadata() != NULL && info.cached_metadata()->is_method(), "sanity check"); |
0 | 359 CompiledStaticCall* csc = compiledStaticCall_at(instruction_address()); |
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360 methodHandle method (thread, (Method*)info.cached_metadata()); |
0 | 361 csc->set_to_interpreted(method, info.entry()); |
362 if (TraceICs) { | |
363 ResourceMark rm(thread); | |
364 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter: %s", | |
365 instruction_address(), | |
366 method->print_value_string()); | |
367 } | |
368 } else { | |
369 // Call via method-klass-holder | |
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370 InlineCacheBuffer::create_transition_stub(this, info.claim_cached_icholder(), info.entry()); |
0 | 371 if (TraceICs) { |
372 ResourceMark rm(thread); | |
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373 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter via icholder ", instruction_address()); |
0 | 374 } |
375 } | |
376 } else { | |
377 // Call to compiled code | |
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378 bool static_bound = info.is_optimized() || (info.cached_metadata() == NULL); |
0 | 379 #ifdef ASSERT |
380 CodeBlob* cb = CodeCache::find_blob_unsafe(info.entry()); | |
381 assert (cb->is_nmethod(), "must be compiled!"); | |
382 #endif /* ASSERT */ | |
383 | |
384 // This is MT safe if we come from a clean-cache and go through a | |
385 // non-verified entry point | |
386 bool safe = SafepointSynchronize::is_at_safepoint() || | |
387 (!is_in_transition_state() && (info.is_optimized() || static_bound || is_clean())); | |
388 | |
389 if (!safe) { | |
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390 InlineCacheBuffer::create_transition_stub(this, info.cached_metadata(), info.entry()); |
0 | 391 } else { |
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392 if (is_optimized()) { |
0 | 393 set_ic_destination(info.entry()); |
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394 } else { |
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395 set_ic_destination_and_value(info.entry(), info.cached_metadata()); |
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396 } |
0 | 397 } |
398 | |
399 if (TraceICs) { | |
400 ResourceMark rm(thread); | |
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401 assert(info.cached_metadata() == NULL || info.cached_metadata()->is_klass(), "must be"); |
0 | 402 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to compiled (rcvr klass) %s: %s", |
403 instruction_address(), | |
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404 ((Klass*)info.cached_metadata())->print_value_string(), |
0 | 405 (safe) ? "" : "via stub"); |
406 } | |
407 } | |
408 // We can't check this anymore. With lazy deopt we could have already | |
409 // cleaned this IC entry before we even return. This is possible if | |
410 // we ran out of space in the inline cache buffer trying to do the | |
411 // set_next and we safepointed to free up space. This is a benign | |
412 // race because the IC entry was complete when we safepointed so | |
413 // cleaning it immediately is harmless. | |
414 // assert(is_call_to_compiled() || is_call_to_interpreted(), "sanity check"); | |
415 } | |
416 | |
417 | |
418 // is_optimized: Compiler has generated an optimized call (i.e., no inline | |
419 // cache) static_bound: The call can be static bound (i.e, no need to use | |
420 // inline cache) | |
421 void CompiledIC::compute_monomorphic_entry(methodHandle method, | |
422 KlassHandle receiver_klass, | |
423 bool is_optimized, | |
424 bool static_bound, | |
425 CompiledICInfo& info, | |
426 TRAPS) { | |
427 nmethod* method_code = method->code(); | |
428 address entry = NULL; | |
429 if (method_code != NULL) { | |
430 // Call to compiled code | |
431 if (static_bound || is_optimized) { | |
432 entry = method_code->verified_entry_point(); | |
433 } else { | |
434 entry = method_code->entry_point(); | |
435 } | |
436 } | |
437 if (entry != NULL) { | |
438 // Call to compiled code | |
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439 info.set_compiled_entry(entry, (static_bound || is_optimized) ? NULL : receiver_klass(), is_optimized); |
0 | 440 } else { |
441 // Note: the following problem exists with Compiler1: | |
442 // - at compile time we may or may not know if the destination is final | |
443 // - if we know that the destination is final, we will emit an optimized | |
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444 // virtual call (no inline cache), and need a Method* to make a call |
0 | 445 // to the interpreter |
446 // - if we do not know if the destination is final, we emit a standard | |
447 // virtual call, and use CompiledICHolder to call interpreted code | |
448 // (no static call stub has been generated) | |
449 // However in that case we will now notice it is static_bound | |
450 // and convert the call into what looks to be an optimized | |
451 // virtual call. This causes problems in verifying the IC because | |
452 // it look vanilla but is optimized. Code in is_call_to_interpreted | |
453 // is aware of this and weakens its asserts. | |
454 | |
455 // static_bound should imply is_optimized -- otherwise we have a | |
456 // performance bug (statically-bindable method is called via | |
457 // dynamically-dispatched call note: the reverse implication isn't | |
458 // necessarily true -- the call may have been optimized based on compiler | |
459 // analysis (static_bound is only based on "final" etc.) | |
460 #ifdef COMPILER2 | |
461 #ifdef TIERED | |
462 #if defined(ASSERT) | |
463 // can't check the assert because we don't have the CompiledIC with which to | |
464 // find the address if the call instruction. | |
465 // | |
466 // CodeBlob* cb = find_blob_unsafe(instruction_address()); | |
467 // assert(cb->is_compiled_by_c1() || !static_bound || is_optimized, "static_bound should imply is_optimized"); | |
468 #endif // ASSERT | |
469 #else | |
470 assert(!static_bound || is_optimized, "static_bound should imply is_optimized"); | |
471 #endif // TIERED | |
472 #endif // COMPILER2 | |
473 if (is_optimized) { | |
474 // Use stub entry | |
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475 info.set_interpreter_entry(method()->get_c2i_entry(), method()); |
0 | 476 } else { |
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477 // Use icholder entry |
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478 CompiledICHolder* holder = new CompiledICHolder(method(), receiver_klass()); |
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479 info.set_icholder_entry(method()->get_c2i_unverified_entry(), holder); |
0 | 480 } |
481 } | |
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482 assert(info.is_optimized() == is_optimized, "must agree"); |
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483 } |
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484 |
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485 |
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486 bool CompiledIC::is_icholder_entry(address entry) { |
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487 CodeBlob* cb = CodeCache::find_blob_unsafe(entry); |
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488 return (cb != NULL && cb->is_adapter_blob()); |
0 | 489 } |
490 | |
491 | |
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492 CompiledIC::CompiledIC(nmethod* nm, NativeCall* call) |
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493 : _ic_call(call) |
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494 { |
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495 address ic_call = call->instruction_address(); |
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496 |
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497 assert(ic_call != NULL, "ic_call address must be set"); |
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498 assert(nm != NULL, "must pass nmethod"); |
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499 assert(nm->contains(ic_call), "must be in nmethod"); |
0 | 500 |
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501 // search for the ic_call at the given address |
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502 RelocIterator iter(nm, ic_call, ic_call+1); |
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503 bool ret = iter.next(); |
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504 assert(ret == true, "relocInfo must exist at this address"); |
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505 assert(iter.addr() == ic_call, "must find ic_call"); |
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506 if (iter.type() == relocInfo::virtual_call_type) { |
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507 virtual_call_Relocation* r = iter.virtual_call_reloc(); |
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508 _is_optimized = false; |
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509 _value = nativeMovConstReg_at(r->cached_value()); |
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510 } else { |
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511 assert(iter.type() == relocInfo::opt_virtual_call_type, "must be a virtual call"); |
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512 _is_optimized = true; |
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513 _value = NULL; |
0 | 514 } |
515 } | |
516 | |
517 | |
518 // ---------------------------------------------------------------------------- | |
519 | |
520 void CompiledStaticCall::set_to_clean() { | |
521 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); | |
522 // Reset call site | |
523 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); | |
524 #ifdef ASSERT | |
525 CodeBlob* cb = CodeCache::find_blob_unsafe(this); | |
526 assert(cb != NULL && cb->is_nmethod(), "must be nmethod"); | |
527 #endif | |
528 set_destination_mt_safe(SharedRuntime::get_resolve_static_call_stub()); | |
529 | |
530 // Do not reset stub here: It is too expensive to call find_stub. | |
531 // Instead, rely on caller (nmethod::clear_inline_caches) to clear | |
532 // both the call and its stub. | |
533 } | |
534 | |
535 | |
536 bool CompiledStaticCall::is_clean() const { | |
537 return destination() == SharedRuntime::get_resolve_static_call_stub(); | |
538 } | |
539 | |
540 bool CompiledStaticCall::is_call_to_compiled() const { | |
541 return CodeCache::contains(destination()); | |
542 } | |
543 | |
544 | |
545 bool CompiledStaticCall::is_call_to_interpreted() const { | |
546 // It is a call to interpreted, if it calls to a stub. Hence, the destination | |
547 // must be in the stub part of the nmethod that contains the call | |
548 nmethod* nm = CodeCache::find_nmethod(instruction_address()); | |
549 return nm->stub_contains(destination()); | |
550 } | |
551 | |
552 | |
553 void CompiledStaticCall::set_to_interpreted(methodHandle callee, address entry) { | |
554 address stub=find_stub(); | |
555 assert(stub!=NULL, "stub not found"); | |
556 | |
557 if (TraceICs) { | |
558 ResourceMark rm; | |
559 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s", | |
560 instruction_address(), | |
561 callee->name_and_sig_as_C_string()); | |
562 } | |
563 | |
564 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); // creation also verifies the object | |
565 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); | |
566 | |
567 assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee(), "a) MT-unsafe modification of inline cache"); | |
568 assert(jump->jump_destination() == (address)-1 || jump->jump_destination() == entry, "b) MT-unsafe modification of inline cache"); | |
569 | |
570 // Update stub | |
571 method_holder->set_data((intptr_t)callee()); | |
572 jump->set_jump_destination(entry); | |
573 | |
574 // Update jump to call | |
575 set_destination_mt_safe(stub); | |
576 } | |
577 | |
578 | |
579 void CompiledStaticCall::set(const StaticCallInfo& info) { | |
580 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); | |
581 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); | |
582 // Updating a cache to the wrong entry can cause bugs that are very hard | |
583 // to track down - if cache entry gets invalid - we just clean it. In | |
584 // this way it is always the same code path that is responsible for | |
585 // updating and resolving an inline cache | |
586 assert(is_clean(), "do not update a call entry - use clean"); | |
587 | |
588 if (info._to_interpreter) { | |
589 // Call to interpreted code | |
590 set_to_interpreted(info.callee(), info.entry()); | |
591 } else { | |
592 if (TraceICs) { | |
593 ResourceMark rm; | |
594 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_compiled " INTPTR_FORMAT, | |
595 instruction_address(), | |
596 info.entry()); | |
597 } | |
598 // Call to compiled code | |
599 assert (CodeCache::contains(info.entry()), "wrong entry point"); | |
600 set_destination_mt_safe(info.entry()); | |
601 } | |
602 } | |
603 | |
604 | |
605 // Compute settings for a CompiledStaticCall. Since we might have to set | |
606 // the stub when calling to the interpreter, we need to return arguments. | |
607 void CompiledStaticCall::compute_entry(methodHandle m, StaticCallInfo& info) { | |
608 nmethod* m_code = m->code(); | |
609 info._callee = m; | |
610 if (m_code != NULL) { | |
611 info._to_interpreter = false; | |
612 info._entry = m_code->verified_entry_point(); | |
613 } else { | |
614 // Callee is interpreted code. In any case entering the interpreter | |
615 // puts a converter-frame on the stack to save arguments. | |
616 info._to_interpreter = true; | |
617 info._entry = m()->get_c2i_entry(); | |
618 } | |
619 } | |
620 | |
621 | |
622 void CompiledStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) { | |
623 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); | |
624 // Reset stub | |
625 address stub = static_stub->addr(); | |
626 assert(stub!=NULL, "stub not found"); | |
627 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); // creation also verifies the object | |
628 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); | |
629 method_holder->set_data(0); | |
630 jump->set_jump_destination((address)-1); | |
631 } | |
632 | |
633 | |
634 address CompiledStaticCall::find_stub() { | |
635 // Find reloc. information containing this call-site | |
636 RelocIterator iter((nmethod*)NULL, instruction_address()); | |
637 while (iter.next()) { | |
638 if (iter.addr() == instruction_address()) { | |
639 switch(iter.type()) { | |
640 case relocInfo::static_call_type: | |
641 return iter.static_call_reloc()->static_stub(); | |
642 // We check here for opt_virtual_call_type, since we reuse the code | |
643 // from the CompiledIC implementation | |
644 case relocInfo::opt_virtual_call_type: | |
645 return iter.opt_virtual_call_reloc()->static_stub(); | |
646 case relocInfo::poll_type: | |
647 case relocInfo::poll_return_type: // A safepoint can't overlap a call. | |
648 default: | |
649 ShouldNotReachHere(); | |
650 } | |
651 } | |
652 } | |
653 return NULL; | |
654 } | |
655 | |
656 | |
657 //----------------------------------------------------------------------------- | |
658 // Non-product mode code | |
659 #ifndef PRODUCT | |
660 | |
661 void CompiledIC::verify() { | |
662 // make sure code pattern is actually a call imm32 instruction | |
663 _ic_call->verify(); | |
664 if (os::is_MP()) { | |
665 _ic_call->verify_alignment(); | |
666 } | |
667 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted() | |
668 || is_optimized() || is_megamorphic(), "sanity check"); | |
669 } | |
670 | |
671 | |
672 void CompiledIC::print() { | |
673 print_compiled_ic(); | |
674 tty->cr(); | |
675 } | |
676 | |
677 | |
678 void CompiledIC::print_compiled_ic() { | |
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679 tty->print("Inline cache at " INTPTR_FORMAT ", calling %s " INTPTR_FORMAT " cached_value " INTPTR_FORMAT, |
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680 instruction_address(), is_call_to_interpreted() ? "interpreted " : "", ic_destination(), is_optimized() ? NULL : cached_value()); |
0 | 681 } |
682 | |
683 | |
684 void CompiledStaticCall::print() { | |
685 tty->print("static call at " INTPTR_FORMAT " -> ", instruction_address()); | |
686 if (is_clean()) { | |
687 tty->print("clean"); | |
688 } else if (is_call_to_compiled()) { | |
689 tty->print("compiled"); | |
690 } else if (is_call_to_interpreted()) { | |
691 tty->print("interpreted"); | |
692 } | |
693 tty->cr(); | |
694 } | |
695 | |
696 void CompiledStaticCall::verify() { | |
697 // Verify call | |
698 NativeCall::verify(); | |
699 if (os::is_MP()) { | |
700 verify_alignment(); | |
701 } | |
702 | |
703 // Verify stub | |
704 address stub = find_stub(); | |
705 assert(stub != NULL, "no stub found for static call"); | |
706 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); // creation also verifies the object | |
707 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); | |
708 | |
709 // Verify state | |
710 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check"); | |
711 } | |
712 | |
713 #endif |