Mercurial > hg > graal-compiler
annotate src/share/vm/code/compiledIC.cpp @ 20432:aff6ccb506cb
8056154: JVM crash with EXCEPTION_ACCESS_VIOLATION when there are many threads running
Summary: Don't make compiled MH intrinsics not entrant when redefining classes
Reviewed-by: kvn, vlivanov
author | iveresov |
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date | Fri, 05 Sep 2014 14:39:45 -0700 |
parents | 2c6ef90f030a |
children | 7848fc12602b |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2014, 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())) { |
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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, p2i(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", p2i((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 { |
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102 MutexLockerEx pl(SafepointSynchronize::is_at_safepoint() ? NULL : Patching_lock, Mutex::_no_safepoint_check_flag); |
0 | 103 #ifdef ASSERT |
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104 CodeBlob* cb = CodeCache::find_blob_unsafe(_ic_call); |
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105 assert(cb != NULL && cb->is_nmethod(), "must be nmethod"); |
0 | 106 #endif |
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107 _ic_call->set_destination_mt_safe(entry_point); |
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108 } |
0 | 109 |
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110 if (is_optimized() || is_icstub) { |
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111 // Optimized call sites don't have a cache value and ICStub call |
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112 // sites only change the entry point. Changing the value in that |
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113 // case could lead to MT safety issues. |
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114 assert(cache == NULL, "must be null"); |
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115 return; |
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116 } |
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117 |
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118 if (cache == NULL) cache = (void*)Universe::non_oop_word(); |
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119 |
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120 _value->set_data((intptr_t)cache); |
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121 } |
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122 |
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123 |
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124 void CompiledIC::set_ic_destination(ICStub* stub) { |
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125 internal_set_ic_destination(stub->code_begin(), true, NULL, false); |
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126 } |
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127 |
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128 |
0 | 129 |
130 address CompiledIC::ic_destination() const { | |
131 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
132 if (!is_in_transition_state()) { | |
133 return _ic_call->destination(); | |
134 } else { | |
135 return InlineCacheBuffer::ic_destination_for((CompiledIC *)this); | |
136 } | |
137 } | |
138 | |
139 | |
140 bool CompiledIC::is_in_transition_state() const { | |
141 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
142 return InlineCacheBuffer::contains(_ic_call->destination()); | |
143 } | |
144 | |
145 | |
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146 bool CompiledIC::is_icholder_call() const { |
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147 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
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148 return !_is_optimized && is_icholder_entry(ic_destination()); |
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149 } |
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150 |
0 | 151 // Returns native address of 'call' instruction in inline-cache. Used by |
152 // the InlineCacheBuffer when it needs to find the stub. | |
153 address CompiledIC::stub_address() const { | |
154 assert(is_in_transition_state(), "should only be called when we are in a transition state"); | |
155 return _ic_call->destination(); | |
156 } | |
157 | |
158 | |
159 //----------------------------------------------------------------------------- | |
160 // High-level access to an inline cache. Guaranteed to be MT-safe. | |
161 | |
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162 void CompiledIC::initialize_from_iter(RelocIterator* iter) { |
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163 assert(iter->addr() == _ic_call->instruction_address(), "must find ic_call"); |
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164 |
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165 if (iter->type() == relocInfo::virtual_call_type) { |
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166 virtual_call_Relocation* r = iter->virtual_call_reloc(); |
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167 _is_optimized = false; |
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168 _value = nativeMovConstReg_at(r->cached_value()); |
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169 } else { |
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170 assert(iter->type() == relocInfo::opt_virtual_call_type, "must be a virtual call"); |
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171 _is_optimized = true; |
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172 _value = NULL; |
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173 } |
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174 } |
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175 |
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176 CompiledIC::CompiledIC(nmethod* nm, NativeCall* call) |
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177 : _ic_call(call) |
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178 { |
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179 address ic_call = _ic_call->instruction_address(); |
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180 |
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181 assert(ic_call != NULL, "ic_call address must be set"); |
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182 assert(nm != NULL, "must pass nmethod"); |
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183 assert(nm->contains(ic_call), "must be in nmethod"); |
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184 |
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185 // Search for the ic_call at the given address. |
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186 RelocIterator iter(nm, ic_call, ic_call+1); |
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187 bool ret = iter.next(); |
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188 assert(ret == true, "relocInfo must exist at this address"); |
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189 assert(iter.addr() == ic_call, "must find ic_call"); |
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190 |
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191 initialize_from_iter(&iter); |
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192 } |
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193 |
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194 CompiledIC::CompiledIC(RelocIterator* iter) |
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195 : _ic_call(nativeCall_at(iter->addr())) |
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196 { |
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197 address ic_call = _ic_call->instruction_address(); |
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198 |
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199 nmethod* nm = iter->code(); |
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200 assert(ic_call != NULL, "ic_call address must be set"); |
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201 assert(nm != NULL, "must pass nmethod"); |
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202 assert(nm->contains(ic_call), "must be in nmethod"); |
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203 |
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204 initialize_from_iter(iter); |
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205 } |
0 | 206 |
12294 | 207 bool CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS) { |
0 | 208 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
209 assert(!is_optimized(), "cannot set an optimized virtual call to megamorphic"); | |
210 assert(is_call_to_compiled() || is_call_to_interpreted(), "going directly to megamorphic?"); | |
211 | |
212 address entry; | |
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213 if (call_info->call_kind() == CallInfo::itable_call) { |
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214 assert(bytecode == Bytecodes::_invokeinterface, ""); |
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215 int itable_index = call_info->itable_index(); |
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216 entry = VtableStubs::find_itable_stub(itable_index); |
12294 | 217 if (entry == false) { |
218 return false; | |
219 } | |
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220 #ifdef ASSERT |
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221 int index = call_info->resolved_method()->itable_index(); |
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222 assert(index == itable_index, "CallInfo pre-computes this"); |
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223 #endif //ASSERT |
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224 InstanceKlass* k = call_info->resolved_method()->method_holder(); |
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225 assert(k->verify_itable_index(itable_index), "sanity check"); |
0 | 226 InlineCacheBuffer::create_transition_stub(this, k, entry); |
227 } else { | |
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228 assert(call_info->call_kind() == CallInfo::vtable_call, "either itable or vtable"); |
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229 // Can be different than selected_method->vtable_index(), due to package-private etc. |
0 | 230 int vtable_index = call_info->vtable_index(); |
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231 assert(call_info->resolved_klass()->verify_vtable_index(vtable_index), "sanity check"); |
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232 entry = VtableStubs::find_vtable_stub(vtable_index); |
12294 | 233 if (entry == NULL) { |
234 return false; | |
235 } | |
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236 InlineCacheBuffer::create_transition_stub(this, NULL, entry); |
0 | 237 } |
238 | |
239 if (TraceICs) { | |
240 ResourceMark rm; | |
241 tty->print_cr ("IC@" INTPTR_FORMAT ": to megamorphic %s entry: " INTPTR_FORMAT, | |
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242 p2i(instruction_address()), call_info->selected_method()->print_value_string(), p2i(entry)); |
0 | 243 } |
244 | |
245 // We can't check this anymore. With lazy deopt we could have already | |
246 // cleaned this IC entry before we even return. This is possible if | |
247 // we ran out of space in the inline cache buffer trying to do the | |
248 // set_next and we safepointed to free up space. This is a benign | |
249 // race because the IC entry was complete when we safepointed so | |
250 // cleaning it immediately is harmless. | |
251 // assert(is_megamorphic(), "sanity check"); | |
12294 | 252 return true; |
0 | 253 } |
254 | |
255 | |
256 // true if destination is megamorphic stub | |
257 bool CompiledIC::is_megamorphic() const { | |
258 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
259 assert(!is_optimized(), "an optimized call cannot be megamorphic"); | |
260 | |
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261 // Cannot rely on cached_value. It is either an interface or a method. |
0 | 262 return VtableStubs::is_entry_point(ic_destination()); |
263 } | |
264 | |
265 bool CompiledIC::is_call_to_compiled() const { | |
266 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
267 | |
268 // Use unsafe, since an inline cache might point to a zombie method. However, the zombie | |
269 // method is guaranteed to still exist, since we only remove methods after all inline caches | |
270 // has been cleaned up | |
271 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination()); | |
272 bool is_monomorphic = (cb != NULL && cb->is_nmethod()); | |
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273 // Check that the cached_value is a klass for non-optimized monomorphic calls |
0 | 274 // This assertion is invalid for compiler1: a call that does not look optimized (no static stub) can be used |
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275 // for calling directly to vep without using the inline cache (i.e., cached_value == NULL) |
0 | 276 #ifdef ASSERT |
277 CodeBlob* caller = CodeCache::find_blob_unsafe(instruction_address()); | |
278 bool is_c1_method = caller->is_compiled_by_c1(); | |
279 assert( is_c1_method || | |
280 !is_monomorphic || | |
281 is_optimized() || | |
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282 (cached_metadata() != NULL && cached_metadata()->is_klass()), "sanity check"); |
0 | 283 #endif // ASSERT |
284 return is_monomorphic; | |
285 } | |
286 | |
287 | |
288 bool CompiledIC::is_call_to_interpreted() const { | |
289 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
290 // Call to interpreter if destination is either calling to a stub (if it | |
291 // is optimized), or calling to an I2C blob | |
292 bool is_call_to_interpreted = false; | |
293 if (!is_optimized()) { | |
294 // must use unsafe because the destination can be a zombie (and we're cleaning) | |
295 // and the print_compiled_ic code wants to know if site (in the non-zombie) | |
296 // is to the interpreter. | |
297 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination()); | |
298 is_call_to_interpreted = (cb != NULL && cb->is_adapter_blob()); | |
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299 assert(!is_call_to_interpreted || (is_icholder_call() && cached_icholder() != NULL), "sanity check"); |
0 | 300 } else { |
301 // Check if we are calling into our own codeblob (i.e., to a stub) | |
302 CodeBlob* cb = CodeCache::find_blob(_ic_call->instruction_address()); | |
303 address dest = ic_destination(); | |
304 #ifdef ASSERT | |
305 { | |
306 CodeBlob* db = CodeCache::find_blob_unsafe(dest); | |
307 assert(!db->is_adapter_blob(), "must use stub!"); | |
308 } | |
309 #endif /* ASSERT */ | |
310 is_call_to_interpreted = cb->contains(dest); | |
311 } | |
312 return is_call_to_interpreted; | |
313 } | |
314 | |
315 | |
316 void CompiledIC::set_to_clean() { | |
317 assert(SafepointSynchronize::is_at_safepoint() || CompiledIC_lock->is_locked() , "MT-unsafe call"); | |
318 if (TraceInlineCacheClearing || TraceICs) { | |
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319 tty->print_cr("IC@" INTPTR_FORMAT ": set to clean", p2i(instruction_address())); |
0 | 320 print(); |
321 } | |
322 | |
323 address entry; | |
324 if (is_optimized()) { | |
325 entry = SharedRuntime::get_resolve_opt_virtual_call_stub(); | |
326 } else { | |
327 entry = SharedRuntime::get_resolve_virtual_call_stub(); | |
328 } | |
329 | |
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330 // A zombie transition will always be safe, since the metadata has already been set to NULL, so |
0 | 331 // we only need to patch the destination |
332 bool safe_transition = is_optimized() || SafepointSynchronize::is_at_safepoint(); | |
333 | |
334 if (safe_transition) { | |
335 // Kill any leftover stub we might have too | |
336 if (is_in_transition_state()) { | |
337 ICStub* old_stub = ICStub_from_destination_address(stub_address()); | |
338 old_stub->clear(); | |
339 } | |
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340 if (is_optimized()) { |
0 | 341 set_ic_destination(entry); |
342 } else { | |
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343 set_ic_destination_and_value(entry, (void*)NULL); |
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344 } |
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345 } else { |
0 | 346 // Unsafe transition - create stub. |
347 InlineCacheBuffer::create_transition_stub(this, NULL, entry); | |
348 } | |
349 // We can't check this anymore. With lazy deopt we could have already | |
350 // cleaned this IC entry before we even return. This is possible if | |
351 // we ran out of space in the inline cache buffer trying to do the | |
352 // set_next and we safepointed to free up space. This is a benign | |
353 // race because the IC entry was complete when we safepointed so | |
354 // cleaning it immediately is harmless. | |
355 // assert(is_clean(), "sanity check"); | |
356 } | |
357 | |
358 | |
359 bool CompiledIC::is_clean() const { | |
360 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
361 bool is_clean = false; | |
362 address dest = ic_destination(); | |
363 is_clean = dest == SharedRuntime::get_resolve_opt_virtual_call_stub() || | |
364 dest == SharedRuntime::get_resolve_virtual_call_stub(); | |
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365 assert(!is_clean || is_optimized() || cached_value() == NULL, "sanity check"); |
0 | 366 return is_clean; |
367 } | |
368 | |
369 | |
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370 void CompiledIC::set_to_monomorphic(CompiledICInfo& info) { |
0 | 371 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
372 // Updating a cache to the wrong entry can cause bugs that are very hard | |
373 // to track down - if cache entry gets invalid - we just clean it. In | |
374 // this way it is always the same code path that is responsible for | |
375 // updating and resolving an inline cache | |
376 // | |
377 // The above is no longer true. SharedRuntime::fixup_callers_callsite will change optimized | |
378 // callsites. In addition ic_miss code will update a site to monomorphic if it determines | |
379 // that an monomorphic call to the interpreter can now be monomorphic to compiled code. | |
380 // | |
381 // In both of these cases the only thing being modifed is the jump/call target and these | |
382 // transitions are mt_safe | |
383 | |
384 Thread *thread = Thread::current(); | |
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385 if (info.to_interpreter()) { |
0 | 386 // Call to interpreter |
387 if (info.is_optimized() && is_optimized()) { | |
388 assert(is_clean(), "unsafe IC path"); | |
389 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); | |
390 // the call analysis (callee structure) specifies that the call is optimized | |
391 // (either because of CHA or the static target is final) | |
392 // At code generation time, this call has been emitted as static call | |
393 // Call via stub | |
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394 assert(info.cached_metadata() != NULL && info.cached_metadata()->is_method(), "sanity check"); |
0 | 395 CompiledStaticCall* csc = compiledStaticCall_at(instruction_address()); |
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396 methodHandle method (thread, (Method*)info.cached_metadata()); |
0 | 397 csc->set_to_interpreted(method, info.entry()); |
398 if (TraceICs) { | |
399 ResourceMark rm(thread); | |
400 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter: %s", | |
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401 p2i(instruction_address()), |
0 | 402 method->print_value_string()); |
403 } | |
404 } else { | |
405 // Call via method-klass-holder | |
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406 InlineCacheBuffer::create_transition_stub(this, info.claim_cached_icholder(), info.entry()); |
0 | 407 if (TraceICs) { |
408 ResourceMark rm(thread); | |
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409 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter via icholder ", p2i(instruction_address())); |
0 | 410 } |
411 } | |
412 } else { | |
413 // Call to compiled code | |
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414 bool static_bound = info.is_optimized() || (info.cached_metadata() == NULL); |
0 | 415 #ifdef ASSERT |
416 CodeBlob* cb = CodeCache::find_blob_unsafe(info.entry()); | |
417 assert (cb->is_nmethod(), "must be compiled!"); | |
418 #endif /* ASSERT */ | |
419 | |
420 // This is MT safe if we come from a clean-cache and go through a | |
421 // non-verified entry point | |
422 bool safe = SafepointSynchronize::is_at_safepoint() || | |
423 (!is_in_transition_state() && (info.is_optimized() || static_bound || is_clean())); | |
424 | |
425 if (!safe) { | |
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426 InlineCacheBuffer::create_transition_stub(this, info.cached_metadata(), info.entry()); |
0 | 427 } else { |
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428 if (is_optimized()) { |
0 | 429 set_ic_destination(info.entry()); |
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430 } else { |
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431 set_ic_destination_and_value(info.entry(), info.cached_metadata()); |
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432 } |
0 | 433 } |
434 | |
435 if (TraceICs) { | |
436 ResourceMark rm(thread); | |
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437 assert(info.cached_metadata() == NULL || info.cached_metadata()->is_klass(), "must be"); |
0 | 438 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to compiled (rcvr klass) %s: %s", |
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439 p2i(instruction_address()), |
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440 ((Klass*)info.cached_metadata())->print_value_string(), |
0 | 441 (safe) ? "" : "via stub"); |
442 } | |
443 } | |
444 // We can't check this anymore. With lazy deopt we could have already | |
445 // cleaned this IC entry before we even return. This is possible if | |
446 // we ran out of space in the inline cache buffer trying to do the | |
447 // set_next and we safepointed to free up space. This is a benign | |
448 // race because the IC entry was complete when we safepointed so | |
449 // cleaning it immediately is harmless. | |
450 // assert(is_call_to_compiled() || is_call_to_interpreted(), "sanity check"); | |
451 } | |
452 | |
453 | |
454 // is_optimized: Compiler has generated an optimized call (i.e., no inline | |
455 // cache) static_bound: The call can be static bound (i.e, no need to use | |
456 // inline cache) | |
457 void CompiledIC::compute_monomorphic_entry(methodHandle method, | |
458 KlassHandle receiver_klass, | |
459 bool is_optimized, | |
460 bool static_bound, | |
461 CompiledICInfo& info, | |
462 TRAPS) { | |
463 nmethod* method_code = method->code(); | |
464 address entry = NULL; | |
13441 | 465 if (method_code != NULL && method_code->is_in_use()) { |
0 | 466 // Call to compiled code |
467 if (static_bound || is_optimized) { | |
468 entry = method_code->verified_entry_point(); | |
469 } else { | |
470 entry = method_code->entry_point(); | |
471 } | |
472 } | |
473 if (entry != NULL) { | |
474 // Call to compiled code | |
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475 info.set_compiled_entry(entry, (static_bound || is_optimized) ? NULL : receiver_klass(), is_optimized); |
0 | 476 } else { |
477 // Note: the following problem exists with Compiler1: | |
478 // - at compile time we may or may not know if the destination is final | |
479 // - if we know that the destination is final, we will emit an optimized | |
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480 // virtual call (no inline cache), and need a Method* to make a call |
0 | 481 // to the interpreter |
482 // - if we do not know if the destination is final, we emit a standard | |
483 // virtual call, and use CompiledICHolder to call interpreted code | |
484 // (no static call stub has been generated) | |
485 // However in that case we will now notice it is static_bound | |
486 // and convert the call into what looks to be an optimized | |
487 // virtual call. This causes problems in verifying the IC because | |
488 // it look vanilla but is optimized. Code in is_call_to_interpreted | |
489 // is aware of this and weakens its asserts. | |
490 | |
491 // static_bound should imply is_optimized -- otherwise we have a | |
492 // performance bug (statically-bindable method is called via | |
493 // dynamically-dispatched call note: the reverse implication isn't | |
494 // necessarily true -- the call may have been optimized based on compiler | |
495 // analysis (static_bound is only based on "final" etc.) | |
496 #ifdef COMPILER2 | |
497 #ifdef TIERED | |
498 #if defined(ASSERT) | |
499 // can't check the assert because we don't have the CompiledIC with which to | |
500 // find the address if the call instruction. | |
501 // | |
502 // CodeBlob* cb = find_blob_unsafe(instruction_address()); | |
503 // assert(cb->is_compiled_by_c1() || !static_bound || is_optimized, "static_bound should imply is_optimized"); | |
504 #endif // ASSERT | |
505 #else | |
506 assert(!static_bound || is_optimized, "static_bound should imply is_optimized"); | |
507 #endif // TIERED | |
508 #endif // COMPILER2 | |
509 if (is_optimized) { | |
510 // Use stub entry | |
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511 info.set_interpreter_entry(method()->get_c2i_entry(), method()); |
0 | 512 } else { |
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513 // Use icholder entry |
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514 CompiledICHolder* holder = new CompiledICHolder(method(), receiver_klass()); |
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515 info.set_icholder_entry(method()->get_c2i_unverified_entry(), holder); |
0 | 516 } |
517 } | |
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518 assert(info.is_optimized() == is_optimized, "must agree"); |
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519 } |
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520 |
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521 |
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522 bool CompiledIC::is_icholder_entry(address entry) { |
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523 CodeBlob* cb = CodeCache::find_blob_unsafe(entry); |
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524 return (cb != NULL && cb->is_adapter_blob()); |
0 | 525 } |
526 | |
527 // ---------------------------------------------------------------------------- | |
528 | |
529 void CompiledStaticCall::set_to_clean() { | |
530 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); | |
531 // Reset call site | |
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532 MutexLockerEx pl(SafepointSynchronize::is_at_safepoint() ? NULL : Patching_lock, Mutex::_no_safepoint_check_flag); |
0 | 533 #ifdef ASSERT |
534 CodeBlob* cb = CodeCache::find_blob_unsafe(this); | |
535 assert(cb != NULL && cb->is_nmethod(), "must be nmethod"); | |
536 #endif | |
537 set_destination_mt_safe(SharedRuntime::get_resolve_static_call_stub()); | |
538 | |
539 // Do not reset stub here: It is too expensive to call find_stub. | |
540 // Instead, rely on caller (nmethod::clear_inline_caches) to clear | |
541 // both the call and its stub. | |
542 } | |
543 | |
544 | |
545 bool CompiledStaticCall::is_clean() const { | |
546 return destination() == SharedRuntime::get_resolve_static_call_stub(); | |
547 } | |
548 | |
549 bool CompiledStaticCall::is_call_to_compiled() const { | |
550 return CodeCache::contains(destination()); | |
551 } | |
552 | |
553 | |
554 bool CompiledStaticCall::is_call_to_interpreted() const { | |
555 // It is a call to interpreted, if it calls to a stub. Hence, the destination | |
556 // must be in the stub part of the nmethod that contains the call | |
557 nmethod* nm = CodeCache::find_nmethod(instruction_address()); | |
558 return nm->stub_contains(destination()); | |
559 } | |
560 | |
561 void CompiledStaticCall::set(const StaticCallInfo& info) { | |
562 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); | |
563 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); | |
564 // Updating a cache to the wrong entry can cause bugs that are very hard | |
565 // to track down - if cache entry gets invalid - we just clean it. In | |
566 // this way it is always the same code path that is responsible for | |
567 // updating and resolving an inline cache | |
568 assert(is_clean(), "do not update a call entry - use clean"); | |
569 | |
570 if (info._to_interpreter) { | |
571 // Call to interpreted code | |
572 set_to_interpreted(info.callee(), info.entry()); | |
573 } else { | |
574 if (TraceICs) { | |
575 ResourceMark rm; | |
576 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_compiled " INTPTR_FORMAT, | |
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577 p2i(instruction_address()), |
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578 p2i(info.entry())); |
0 | 579 } |
580 // Call to compiled code | |
581 assert (CodeCache::contains(info.entry()), "wrong entry point"); | |
582 set_destination_mt_safe(info.entry()); | |
583 } | |
584 } | |
585 | |
586 | |
587 // Compute settings for a CompiledStaticCall. Since we might have to set | |
588 // the stub when calling to the interpreter, we need to return arguments. | |
589 void CompiledStaticCall::compute_entry(methodHandle m, StaticCallInfo& info) { | |
590 nmethod* m_code = m->code(); | |
591 info._callee = m; | |
13441 | 592 if (m_code != NULL && m_code->is_in_use()) { |
0 | 593 info._to_interpreter = false; |
594 info._entry = m_code->verified_entry_point(); | |
595 } else { | |
596 // Callee is interpreted code. In any case entering the interpreter | |
597 // puts a converter-frame on the stack to save arguments. | |
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598 assert(!m->is_method_handle_intrinsic(), "Compiled code should never call interpreter MH intrinsics"); |
0 | 599 info._to_interpreter = true; |
600 info._entry = m()->get_c2i_entry(); | |
601 } | |
602 } | |
603 | |
604 address CompiledStaticCall::find_stub() { | |
605 // Find reloc. information containing this call-site | |
606 RelocIterator iter((nmethod*)NULL, instruction_address()); | |
607 while (iter.next()) { | |
608 if (iter.addr() == instruction_address()) { | |
609 switch(iter.type()) { | |
610 case relocInfo::static_call_type: | |
611 return iter.static_call_reloc()->static_stub(); | |
612 // We check here for opt_virtual_call_type, since we reuse the code | |
613 // from the CompiledIC implementation | |
614 case relocInfo::opt_virtual_call_type: | |
615 return iter.opt_virtual_call_reloc()->static_stub(); | |
616 case relocInfo::poll_type: | |
617 case relocInfo::poll_return_type: // A safepoint can't overlap a call. | |
618 default: | |
619 ShouldNotReachHere(); | |
620 } | |
621 } | |
622 } | |
623 return NULL; | |
624 } | |
625 | |
626 | |
627 //----------------------------------------------------------------------------- | |
628 // Non-product mode code | |
629 #ifndef PRODUCT | |
630 | |
631 void CompiledIC::verify() { | |
632 // make sure code pattern is actually a call imm32 instruction | |
633 _ic_call->verify(); | |
634 if (os::is_MP()) { | |
635 _ic_call->verify_alignment(); | |
636 } | |
637 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted() | |
638 || is_optimized() || is_megamorphic(), "sanity check"); | |
639 } | |
640 | |
641 void CompiledIC::print() { | |
642 print_compiled_ic(); | |
643 tty->cr(); | |
644 } | |
645 | |
646 void CompiledIC::print_compiled_ic() { | |
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647 tty->print("Inline cache at " INTPTR_FORMAT ", calling %s " INTPTR_FORMAT " cached_value " INTPTR_FORMAT, |
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648 p2i(instruction_address()), is_call_to_interpreted() ? "interpreted " : "", p2i(ic_destination()), p2i(is_optimized() ? NULL : cached_value())); |
0 | 649 } |
650 | |
651 void CompiledStaticCall::print() { | |
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652 tty->print("static call at " INTPTR_FORMAT " -> ", p2i(instruction_address())); |
0 | 653 if (is_clean()) { |
654 tty->print("clean"); | |
655 } else if (is_call_to_compiled()) { | |
656 tty->print("compiled"); | |
657 } else if (is_call_to_interpreted()) { | |
658 tty->print("interpreted"); | |
659 } | |
660 tty->cr(); | |
661 } | |
662 | |
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663 #endif // !PRODUCT |