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annotate src/share/vm/code/compiledIC.hpp @ 1633:65b0c03b165d
6965671: fatal error: acquiring lock JNIGlobalHandle_lock/16 out of order with lock CodeCache_lock/1
Reviewed-by: kvn, dcubed
author | never |
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date | Fri, 02 Jul 2010 15:01:47 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2005, 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 | |
25 //----------------------------------------------------------------------------- | |
26 // The CompiledIC represents a compiled inline cache. | |
27 // | |
28 // In order to make patching of the inline cache MT-safe, we only allow the following | |
29 // transitions (when not at a safepoint): | |
30 // | |
31 // | |
32 // [1] --<-- Clean -->--- [1] | |
33 // / (null) \ | |
34 // / \ /-<-\ | |
35 // / [2] \ / \ | |
36 // Interpreted ---------> Monomorphic | [3] | |
37 // (compiledICHolderOop) (klassOop) | | |
38 // \ / \ / | |
39 // [4] \ / [4] \->-/ | |
40 // \->- Megamorphic -<-/ | |
41 // (methodOop) | |
42 // | |
43 // The text in paranteses () refere to the value of the inline cache receiver (mov instruction) | |
44 // | |
45 // The numbers in square brackets refere to the kind of transition: | |
46 // [1]: Initial fixup. Receiver it found from debug information | |
47 // [2]: Compilation of a method | |
48 // [3]: Recompilation of a method (note: only entry is changed. The klassOop must stay the same) | |
49 // [4]: Inline cache miss. We go directly to megamorphic call. | |
50 // | |
51 // The class automatically inserts transition stubs (using the InlineCacheBuffer) when an MT-unsafe | |
52 // transition is made to a stub. | |
53 // | |
54 class CompiledIC; | |
55 | |
56 class CompiledICInfo { | |
57 friend class CompiledIC; | |
58 private: | |
59 address _entry; // entry point for call | |
60 Handle _cached_oop; // Value of cached_oop (either in stub or inline cache) | |
61 bool _is_optimized; // it is an optimized virtual call (i.e., can be statically bound) | |
62 bool _to_interpreter; // Call it to interpreter | |
63 public: | |
64 address entry() const { return _entry; } | |
65 Handle cached_oop() const { return _cached_oop; } | |
66 bool is_optimized() const { return _is_optimized; } | |
67 }; | |
68 | |
69 class CompiledIC: public ResourceObj { | |
70 friend class InlineCacheBuffer; | |
71 friend class ICStub; | |
72 | |
73 | |
74 private: | |
75 NativeCall* _ic_call; // the call instruction | |
76 oop* _oop_addr; // patchable oop cell for this IC | |
77 RelocIterator _oops; // iteration over any and all set-oop instructions | |
78 bool _is_optimized; // an optimized virtual call (i.e., no compiled IC) | |
79 | |
80 CompiledIC(NativeCall* ic_call); | |
81 CompiledIC(Relocation* ic_reloc); // Must be of virtual_call_type/opt_virtual_call_type | |
82 | |
83 // low-level inline-cache manipulation. Cannot be accessed directly, since it might not be MT-safe | |
84 // to change an inline-cache. These changes the underlying inline-cache directly. They *newer* make | |
85 // changes to a transition stub. | |
86 void set_ic_destination(address entry_point); | |
87 void set_cached_oop(oop cache); | |
88 | |
89 // Reads the location of the transition stub. This will fail with an assertion, if no transition stub is | |
90 // associated with the inline cache. | |
91 address stub_address() const; | |
92 bool is_in_transition_state() const; // Use InlineCacheBuffer | |
93 | |
94 public: | |
95 // conversion (machine PC to CompiledIC*) | |
96 friend CompiledIC* CompiledIC_before(address return_addr); | |
97 friend CompiledIC* CompiledIC_at(address call_site); | |
98 friend CompiledIC* CompiledIC_at(Relocation* call_site); | |
99 | |
100 // Return the cached_oop/destination associated with this inline cache. If the cache currently points | |
101 // to a transition stub, it will read the values from the transition stub. | |
102 oop cached_oop() const; | |
103 address ic_destination() const; | |
104 | |
105 bool is_optimized() const { return _is_optimized; } | |
106 | |
107 // State | |
108 bool is_clean() const; | |
109 bool is_megamorphic() const; | |
110 bool is_call_to_compiled() const; | |
111 bool is_call_to_interpreted() const; | |
112 | |
113 address end_of_call() { return _ic_call->return_address(); } | |
114 | |
115 // MT-safe patching of inline caches. Note: Only safe to call is_xxx when holding the CompiledIC_ock | |
116 // so you are guaranteed that no patching takes place. The same goes for verify. | |
117 // | |
118 // Note: We do not provide any direct access to the stub code, to prevent parts of the code | |
119 // to manipulate the inline cache in MT-unsafe ways. | |
120 // | |
121 // They all takes a TRAP argument, since they can cause a GC if the inline-cache buffer is full. | |
122 // | |
123 void set_to_clean(); // Can only be called during a safepoint operation | |
124 void set_to_monomorphic(const CompiledICInfo& info); | |
125 void set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS); | |
126 | |
127 static void compute_monomorphic_entry(methodHandle method, KlassHandle receiver_klass, | |
128 bool is_optimized, bool static_bound, CompiledICInfo& info, TRAPS); | |
129 | |
130 // Location | |
131 address instruction_address() const { return _ic_call->instruction_address(); } | |
132 | |
133 // Misc | |
134 void print() PRODUCT_RETURN; | |
135 void print_compiled_ic() PRODUCT_RETURN; | |
136 void verify() PRODUCT_RETURN; | |
137 }; | |
138 | |
139 inline CompiledIC* CompiledIC_before(address return_addr) { | |
140 CompiledIC* c_ic = new CompiledIC(nativeCall_before(return_addr)); | |
141 c_ic->verify(); | |
142 return c_ic; | |
143 } | |
144 | |
145 inline CompiledIC* CompiledIC_at(address call_site) { | |
146 CompiledIC* c_ic = new CompiledIC(nativeCall_at(call_site)); | |
147 c_ic->verify(); | |
148 return c_ic; | |
149 } | |
150 | |
151 inline CompiledIC* CompiledIC_at(Relocation* call_site) { | |
152 CompiledIC* c_ic = new CompiledIC(call_site); | |
153 c_ic->verify(); | |
154 return c_ic; | |
155 } | |
156 | |
157 | |
158 //----------------------------------------------------------------------------- | |
159 // The CompiledStaticCall represents a call to a static method in the compiled | |
160 // | |
161 // Transition diagram of a static call site is somewhat simpler than for an inlined cache: | |
162 // | |
163 // | |
164 // -----<----- Clean ----->----- | |
165 // / \ | |
166 // / \ | |
167 // compilled code <------------> interpreted code | |
168 // | |
169 // Clean: Calls directly to runtime method for fixup | |
170 // Compiled code: Calls directly to compiled code | |
171 // Interpreted code: Calls to stub that set methodOop reference | |
172 // | |
173 // | |
174 class CompiledStaticCall; | |
175 | |
176 class StaticCallInfo { | |
177 private: | |
178 address _entry; // Entrypoint | |
179 methodHandle _callee; // Callee (used when calling interpreter) | |
180 bool _to_interpreter; // call to interpreted method (otherwise compiled) | |
181 | |
182 friend class CompiledStaticCall; | |
183 public: | |
184 address entry() const { return _entry; } | |
185 methodHandle callee() const { return _callee; } | |
186 }; | |
187 | |
188 | |
189 class CompiledStaticCall: public NativeCall { | |
190 friend class CompiledIC; | |
191 | |
192 // Also used by CompiledIC | |
193 void set_to_interpreted(methodHandle callee, address entry); | |
194 bool is_optimized_virtual(); | |
195 | |
196 public: | |
197 friend CompiledStaticCall* compiledStaticCall_before(address return_addr); | |
198 friend CompiledStaticCall* compiledStaticCall_at(address native_call); | |
199 friend CompiledStaticCall* compiledStaticCall_at(Relocation* call_site); | |
200 | |
201 // State | |
202 bool is_clean() const; | |
203 bool is_call_to_compiled() const; | |
204 bool is_call_to_interpreted() const; | |
205 | |
206 // Clean static call (will force resolving on next use) | |
207 void set_to_clean(); | |
208 | |
209 // Set state. The entry must be the same, as computed by compute_entry. | |
210 // Computation and setting is split up, since the actions are separate during | |
211 // a OptoRuntime::resolve_xxx. | |
212 void set(const StaticCallInfo& info); | |
213 | |
214 // Compute entry point given a method | |
215 static void compute_entry(methodHandle m, StaticCallInfo& info); | |
216 | |
217 // Stub support | |
218 address find_stub(); | |
219 static void set_stub_to_clean(static_stub_Relocation* static_stub); | |
220 | |
221 // Misc. | |
222 void print() PRODUCT_RETURN; | |
223 void verify() PRODUCT_RETURN; | |
224 }; | |
225 | |
226 | |
227 inline CompiledStaticCall* compiledStaticCall_before(address return_addr) { | |
228 CompiledStaticCall* st = (CompiledStaticCall*)nativeCall_before(return_addr); | |
229 st->verify(); | |
230 return st; | |
231 } | |
232 | |
233 inline CompiledStaticCall* compiledStaticCall_at(address native_call) { | |
234 CompiledStaticCall* st = (CompiledStaticCall*)native_call; | |
235 st->verify(); | |
236 return st; | |
237 } | |
238 | |
239 inline CompiledStaticCall* compiledStaticCall_at(Relocation* call_site) { | |
240 return compiledStaticCall_at(call_site->addr()); | |
241 } |