Mercurial > hg > truffle
annotate src/share/vm/code/compiledIC.cpp @ 3756:c8f2186acf6d
7053520: JSR292: crash in invokedynamic with C1 using tiered and compressed oops
Reviewed-by: iveresov, never
author | twisti |
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date | Tue, 14 Jun 2011 12:25:05 -0700 |
parents | 1d1603768966 |
children | 0654ee04b214 aa3d708d67c4 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2011, 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 | |
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7 * published by the Free Software Foundation. | |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
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12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
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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 |
c18cbe5936b8
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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" | |
34 #include "memory/oopFactory.hpp" | |
35 #include "oops/methodOop.hpp" | |
36 #include "oops/oop.inline.hpp" | |
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37 #include "oops/symbol.hpp" |
1972 | 38 #include "runtime/icache.hpp" |
39 #include "runtime/sharedRuntime.hpp" | |
40 #include "runtime/stubRoutines.hpp" | |
41 #include "utilities/events.hpp" | |
0 | 42 |
43 | |
44 // Every time a compiled IC is changed or its type is being accessed, | |
45 // either the CompiledIC_lock must be set or we must be at a safe point. | |
46 | |
47 //----------------------------------------------------------------------------- | |
48 // Low-level access to an inline cache. Private, since they might not be | |
49 // MT-safe to use. | |
50 | |
51 void CompiledIC::set_cached_oop(oop cache) { | |
52 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
53 assert (!is_optimized(), "an optimized virtual call does not have a cached oop"); | |
54 assert (cache == NULL || cache != badOop, "invalid oop"); | |
55 | |
56 if (TraceCompiledIC) { | |
57 tty->print(" "); | |
58 print_compiled_ic(); | |
59 tty->print_cr(" changing oop to " INTPTR_FORMAT, (address)cache); | |
60 } | |
61 | |
62 if (cache == NULL) cache = (oop)Universe::non_oop_word(); | |
63 | |
64 *_oop_addr = cache; | |
65 // fix up the relocations | |
66 RelocIterator iter = _oops; | |
67 while (iter.next()) { | |
68 if (iter.type() == relocInfo::oop_type) { | |
69 oop_Relocation* r = iter.oop_reloc(); | |
70 if (r->oop_addr() == _oop_addr) | |
71 r->fix_oop_relocation(); | |
72 } | |
73 } | |
74 return; | |
75 } | |
76 | |
77 | |
78 oop CompiledIC::cached_oop() const { | |
79 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
80 assert (!is_optimized(), "an optimized virtual call does not have a cached oop"); | |
81 | |
82 if (!is_in_transition_state()) { | |
83 oop data = *_oop_addr; | |
84 // If we let the oop value here be initialized to zero... | |
85 assert(data != NULL || Universe::non_oop_word() == NULL, | |
86 "no raw nulls in CompiledIC oops, because of patching races"); | |
87 return (data == (oop)Universe::non_oop_word()) ? (oop)NULL : data; | |
88 } else { | |
89 return InlineCacheBuffer::cached_oop_for((CompiledIC *)this); | |
90 } | |
91 } | |
92 | |
93 | |
94 void CompiledIC::set_ic_destination(address entry_point) { | |
95 assert(entry_point != NULL, "must set legal entry point"); | |
96 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
97 if (TraceCompiledIC) { | |
98 tty->print(" "); | |
99 print_compiled_ic(); | |
100 tty->print_cr(" changing destination to " INTPTR_FORMAT, entry_point); | |
101 } | |
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 | |
110 | |
111 address CompiledIC::ic_destination() const { | |
112 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
113 if (!is_in_transition_state()) { | |
114 return _ic_call->destination(); | |
115 } else { | |
116 return InlineCacheBuffer::ic_destination_for((CompiledIC *)this); | |
117 } | |
118 } | |
119 | |
120 | |
121 bool CompiledIC::is_in_transition_state() const { | |
122 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
123 return InlineCacheBuffer::contains(_ic_call->destination()); | |
124 } | |
125 | |
126 | |
127 // Returns native address of 'call' instruction in inline-cache. Used by | |
128 // the InlineCacheBuffer when it needs to find the stub. | |
129 address CompiledIC::stub_address() const { | |
130 assert(is_in_transition_state(), "should only be called when we are in a transition state"); | |
131 return _ic_call->destination(); | |
132 } | |
133 | |
134 | |
135 //----------------------------------------------------------------------------- | |
136 // High-level access to an inline cache. Guaranteed to be MT-safe. | |
137 | |
138 | |
139 void CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS) { | |
140 methodHandle method = call_info->selected_method(); | |
141 bool is_invoke_interface = (bytecode == Bytecodes::_invokeinterface && !call_info->has_vtable_index()); | |
142 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
143 assert(method->is_oop(), "cannot be NULL and must be oop"); | |
144 assert(!is_optimized(), "cannot set an optimized virtual call to megamorphic"); | |
145 assert(is_call_to_compiled() || is_call_to_interpreted(), "going directly to megamorphic?"); | |
146 | |
147 address entry; | |
148 if (is_invoke_interface) { | |
149 int index = klassItable::compute_itable_index(call_info->resolved_method()()); | |
150 entry = VtableStubs::create_stub(false, index, method()); | |
151 assert(entry != NULL, "entry not computed"); | |
152 klassOop k = call_info->resolved_method()->method_holder(); | |
153 assert(Klass::cast(k)->is_interface(), "sanity check"); | |
154 InlineCacheBuffer::create_transition_stub(this, k, entry); | |
155 } else { | |
156 // Can be different than method->vtable_index(), due to package-private etc. | |
157 int vtable_index = call_info->vtable_index(); | |
158 entry = VtableStubs::create_stub(true, vtable_index, method()); | |
159 InlineCacheBuffer::create_transition_stub(this, method(), entry); | |
160 } | |
161 | |
162 if (TraceICs) { | |
163 ResourceMark rm; | |
164 tty->print_cr ("IC@" INTPTR_FORMAT ": to megamorphic %s entry: " INTPTR_FORMAT, | |
165 instruction_address(), method->print_value_string(), entry); | |
166 } | |
167 | |
168 Events::log("compiledIC " INTPTR_FORMAT " --> megamorphic " INTPTR_FORMAT, this, (address)method()); | |
169 // We can't check this anymore. With lazy deopt we could have already | |
170 // cleaned this IC entry before we even return. This is possible if | |
171 // we ran out of space in the inline cache buffer trying to do the | |
172 // set_next and we safepointed to free up space. This is a benign | |
173 // race because the IC entry was complete when we safepointed so | |
174 // cleaning it immediately is harmless. | |
175 // assert(is_megamorphic(), "sanity check"); | |
176 } | |
177 | |
178 | |
179 // true if destination is megamorphic stub | |
180 bool CompiledIC::is_megamorphic() const { | |
181 assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
182 assert(!is_optimized(), "an optimized call cannot be megamorphic"); | |
183 | |
184 // Cannot rely on cached_oop. It is either an interface or a method. | |
185 return VtableStubs::is_entry_point(ic_destination()); | |
186 } | |
187 | |
188 bool CompiledIC::is_call_to_compiled() const { | |
189 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
190 | |
191 // Use unsafe, since an inline cache might point to a zombie method. However, the zombie | |
192 // method is guaranteed to still exist, since we only remove methods after all inline caches | |
193 // has been cleaned up | |
194 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination()); | |
195 bool is_monomorphic = (cb != NULL && cb->is_nmethod()); | |
196 // Check that the cached_oop is a klass for non-optimized monomorphic calls | |
197 // This assertion is invalid for compiler1: a call that does not look optimized (no static stub) can be used | |
198 // for calling directly to vep without using the inline cache (i.e., cached_oop == NULL) | |
199 #ifdef ASSERT | |
200 #ifdef TIERED | |
201 CodeBlob* caller = CodeCache::find_blob_unsafe(instruction_address()); | |
202 bool is_c1_method = caller->is_compiled_by_c1(); | |
203 #else | |
204 #ifdef COMPILER1 | |
205 bool is_c1_method = true; | |
206 #else | |
207 bool is_c1_method = false; | |
208 #endif // COMPILER1 | |
209 #endif // TIERED | |
210 assert( is_c1_method || | |
211 !is_monomorphic || | |
212 is_optimized() || | |
213 (cached_oop() != NULL && cached_oop()->is_klass()), "sanity check"); | |
214 #endif // ASSERT | |
215 return is_monomorphic; | |
216 } | |
217 | |
218 | |
219 bool CompiledIC::is_call_to_interpreted() const { | |
220 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
221 // Call to interpreter if destination is either calling to a stub (if it | |
222 // is optimized), or calling to an I2C blob | |
223 bool is_call_to_interpreted = false; | |
224 if (!is_optimized()) { | |
225 // must use unsafe because the destination can be a zombie (and we're cleaning) | |
226 // and the print_compiled_ic code wants to know if site (in the non-zombie) | |
227 // is to the interpreter. | |
228 CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination()); | |
229 is_call_to_interpreted = (cb != NULL && cb->is_adapter_blob()); | |
230 assert(!is_call_to_interpreted || (cached_oop() != NULL && cached_oop()->is_compiledICHolder()), "sanity check"); | |
231 } else { | |
232 // Check if we are calling into our own codeblob (i.e., to a stub) | |
233 CodeBlob* cb = CodeCache::find_blob(_ic_call->instruction_address()); | |
234 address dest = ic_destination(); | |
235 #ifdef ASSERT | |
236 { | |
237 CodeBlob* db = CodeCache::find_blob_unsafe(dest); | |
238 assert(!db->is_adapter_blob(), "must use stub!"); | |
239 } | |
240 #endif /* ASSERT */ | |
241 is_call_to_interpreted = cb->contains(dest); | |
242 } | |
243 return is_call_to_interpreted; | |
244 } | |
245 | |
246 | |
247 void CompiledIC::set_to_clean() { | |
248 assert(SafepointSynchronize::is_at_safepoint() || CompiledIC_lock->is_locked() , "MT-unsafe call"); | |
249 if (TraceInlineCacheClearing || TraceICs) { | |
250 tty->print_cr("IC@" INTPTR_FORMAT ": set to clean", instruction_address()); | |
251 print(); | |
252 } | |
253 | |
254 address entry; | |
255 if (is_optimized()) { | |
256 entry = SharedRuntime::get_resolve_opt_virtual_call_stub(); | |
257 } else { | |
258 entry = SharedRuntime::get_resolve_virtual_call_stub(); | |
259 } | |
260 | |
261 // A zombie transition will always be safe, since the oop has already been set to NULL, so | |
262 // we only need to patch the destination | |
263 bool safe_transition = is_optimized() || SafepointSynchronize::is_at_safepoint(); | |
264 | |
265 if (safe_transition) { | |
266 if (!is_optimized()) set_cached_oop(NULL); | |
267 // Kill any leftover stub we might have too | |
268 if (is_in_transition_state()) { | |
269 ICStub* old_stub = ICStub_from_destination_address(stub_address()); | |
270 old_stub->clear(); | |
271 } | |
272 set_ic_destination(entry); | |
273 } else { | |
274 // Unsafe transition - create stub. | |
275 InlineCacheBuffer::create_transition_stub(this, NULL, entry); | |
276 } | |
277 // We can't check this anymore. With lazy deopt we could have already | |
278 // cleaned this IC entry before we even return. This is possible if | |
279 // we ran out of space in the inline cache buffer trying to do the | |
280 // set_next and we safepointed to free up space. This is a benign | |
281 // race because the IC entry was complete when we safepointed so | |
282 // cleaning it immediately is harmless. | |
283 // assert(is_clean(), "sanity check"); | |
284 } | |
285 | |
286 | |
287 bool CompiledIC::is_clean() const { | |
288 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
289 bool is_clean = false; | |
290 address dest = ic_destination(); | |
291 is_clean = dest == SharedRuntime::get_resolve_opt_virtual_call_stub() || | |
292 dest == SharedRuntime::get_resolve_virtual_call_stub(); | |
293 assert(!is_clean || is_optimized() || cached_oop() == NULL, "sanity check"); | |
294 return is_clean; | |
295 } | |
296 | |
297 | |
298 void CompiledIC::set_to_monomorphic(const CompiledICInfo& info) { | |
299 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); | |
300 // Updating a cache to the wrong entry can cause bugs that are very hard | |
301 // to track down - if cache entry gets invalid - we just clean it. In | |
302 // this way it is always the same code path that is responsible for | |
303 // updating and resolving an inline cache | |
304 // | |
305 // The above is no longer true. SharedRuntime::fixup_callers_callsite will change optimized | |
306 // callsites. In addition ic_miss code will update a site to monomorphic if it determines | |
307 // that an monomorphic call to the interpreter can now be monomorphic to compiled code. | |
308 // | |
309 // In both of these cases the only thing being modifed is the jump/call target and these | |
310 // transitions are mt_safe | |
311 | |
312 Thread *thread = Thread::current(); | |
313 if (info._to_interpreter) { | |
314 // Call to interpreter | |
315 if (info.is_optimized() && is_optimized()) { | |
316 assert(is_clean(), "unsafe IC path"); | |
317 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); | |
318 // the call analysis (callee structure) specifies that the call is optimized | |
319 // (either because of CHA or the static target is final) | |
320 // At code generation time, this call has been emitted as static call | |
321 // Call via stub | |
322 assert(info.cached_oop().not_null() && info.cached_oop()->is_method(), "sanity check"); | |
323 CompiledStaticCall* csc = compiledStaticCall_at(instruction_address()); | |
324 methodHandle method (thread, (methodOop)info.cached_oop()()); | |
325 csc->set_to_interpreted(method, info.entry()); | |
326 if (TraceICs) { | |
327 ResourceMark rm(thread); | |
328 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter: %s", | |
329 instruction_address(), | |
330 method->print_value_string()); | |
331 } | |
332 } else { | |
333 // Call via method-klass-holder | |
334 assert(info.cached_oop().not_null(), "must be set"); | |
335 InlineCacheBuffer::create_transition_stub(this, info.cached_oop()(), info.entry()); | |
336 | |
337 if (TraceICs) { | |
338 ResourceMark rm(thread); | |
339 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter via mkh", instruction_address()); | |
340 } | |
341 } | |
342 } else { | |
343 // Call to compiled code | |
344 bool static_bound = info.is_optimized() || (info.cached_oop().is_null()); | |
345 #ifdef ASSERT | |
346 CodeBlob* cb = CodeCache::find_blob_unsafe(info.entry()); | |
347 assert (cb->is_nmethod(), "must be compiled!"); | |
348 #endif /* ASSERT */ | |
349 | |
350 // This is MT safe if we come from a clean-cache and go through a | |
351 // non-verified entry point | |
352 bool safe = SafepointSynchronize::is_at_safepoint() || | |
353 (!is_in_transition_state() && (info.is_optimized() || static_bound || is_clean())); | |
354 | |
355 if (!safe) { | |
356 InlineCacheBuffer::create_transition_stub(this, info.cached_oop()(), info.entry()); | |
357 } else { | |
358 set_ic_destination(info.entry()); | |
359 if (!is_optimized()) set_cached_oop(info.cached_oop()()); | |
360 } | |
361 | |
362 if (TraceICs) { | |
363 ResourceMark rm(thread); | |
364 assert(info.cached_oop() == NULL || info.cached_oop()()->is_klass(), "must be"); | |
365 tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to compiled (rcvr klass) %s: %s", | |
366 instruction_address(), | |
367 ((klassOop)info.cached_oop()())->print_value_string(), | |
368 (safe) ? "" : "via stub"); | |
369 } | |
370 } | |
371 // We can't check this anymore. With lazy deopt we could have already | |
372 // cleaned this IC entry before we even return. This is possible if | |
373 // we ran out of space in the inline cache buffer trying to do the | |
374 // set_next and we safepointed to free up space. This is a benign | |
375 // race because the IC entry was complete when we safepointed so | |
376 // cleaning it immediately is harmless. | |
377 // assert(is_call_to_compiled() || is_call_to_interpreted(), "sanity check"); | |
378 } | |
379 | |
380 | |
381 // is_optimized: Compiler has generated an optimized call (i.e., no inline | |
382 // cache) static_bound: The call can be static bound (i.e, no need to use | |
383 // inline cache) | |
384 void CompiledIC::compute_monomorphic_entry(methodHandle method, | |
385 KlassHandle receiver_klass, | |
386 bool is_optimized, | |
387 bool static_bound, | |
388 CompiledICInfo& info, | |
389 TRAPS) { | |
390 info._is_optimized = is_optimized; | |
391 | |
392 nmethod* method_code = method->code(); | |
393 address entry = NULL; | |
394 if (method_code != NULL) { | |
395 // Call to compiled code | |
396 if (static_bound || is_optimized) { | |
397 entry = method_code->verified_entry_point(); | |
398 } else { | |
399 entry = method_code->entry_point(); | |
400 } | |
401 } | |
402 if (entry != NULL) { | |
403 // Call to compiled code | |
404 info._entry = entry; | |
405 if (static_bound || is_optimized) { | |
406 info._cached_oop = Handle(THREAD, (oop)NULL); | |
407 } else { | |
408 info._cached_oop = receiver_klass; | |
409 } | |
410 info._to_interpreter = false; | |
411 } else { | |
412 // Note: the following problem exists with Compiler1: | |
413 // - at compile time we may or may not know if the destination is final | |
414 // - if we know that the destination is final, we will emit an optimized | |
415 // virtual call (no inline cache), and need a methodOop to make a call | |
416 // to the interpreter | |
417 // - if we do not know if the destination is final, we emit a standard | |
418 // virtual call, and use CompiledICHolder to call interpreted code | |
419 // (no static call stub has been generated) | |
420 // However in that case we will now notice it is static_bound | |
421 // and convert the call into what looks to be an optimized | |
422 // virtual call. This causes problems in verifying the IC because | |
423 // it look vanilla but is optimized. Code in is_call_to_interpreted | |
424 // is aware of this and weakens its asserts. | |
425 | |
426 info._to_interpreter = true; | |
427 // static_bound should imply is_optimized -- otherwise we have a | |
428 // performance bug (statically-bindable method is called via | |
429 // dynamically-dispatched call note: the reverse implication isn't | |
430 // necessarily true -- the call may have been optimized based on compiler | |
431 // analysis (static_bound is only based on "final" etc.) | |
432 #ifdef COMPILER2 | |
433 #ifdef TIERED | |
434 #if defined(ASSERT) | |
435 // can't check the assert because we don't have the CompiledIC with which to | |
436 // find the address if the call instruction. | |
437 // | |
438 // CodeBlob* cb = find_blob_unsafe(instruction_address()); | |
439 // assert(cb->is_compiled_by_c1() || !static_bound || is_optimized, "static_bound should imply is_optimized"); | |
440 #endif // ASSERT | |
441 #else | |
442 assert(!static_bound || is_optimized, "static_bound should imply is_optimized"); | |
443 #endif // TIERED | |
444 #endif // COMPILER2 | |
445 if (is_optimized) { | |
446 // Use stub entry | |
447 info._entry = method()->get_c2i_entry(); | |
448 info._cached_oop = method; | |
449 } else { | |
450 // Use mkh entry | |
451 oop holder = oopFactory::new_compiledICHolder(method, receiver_klass, CHECK); | |
452 info._cached_oop = Handle(THREAD, holder); | |
453 info._entry = method()->get_c2i_unverified_entry(); | |
454 } | |
455 } | |
456 } | |
457 | |
458 | |
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459 inline static RelocIterator parse_ic(nmethod* nm, address ic_call, oop* &_oop_addr, bool *is_optimized) { |
0 | 460 address first_oop = NULL; |
461 // Mergers please note: Sun SC5.x CC insists on an lvalue for a reference parameter. | |
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462 nmethod* tmp_nm = nm; |
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463 return virtual_call_Relocation::parse_ic(tmp_nm, ic_call, first_oop, _oop_addr, is_optimized); |
0 | 464 } |
465 | |
466 CompiledIC::CompiledIC(NativeCall* ic_call) | |
467 : _ic_call(ic_call), | |
468 _oops(parse_ic(NULL, ic_call->instruction_address(), _oop_addr, &_is_optimized)) | |
469 { | |
470 } | |
471 | |
472 | |
473 CompiledIC::CompiledIC(Relocation* ic_reloc) | |
474 : _ic_call(nativeCall_at(ic_reloc->addr())), | |
475 _oops(parse_ic(ic_reloc->code(), ic_reloc->addr(), _oop_addr, &_is_optimized)) | |
476 { | |
477 assert(ic_reloc->type() == relocInfo::virtual_call_type || | |
478 ic_reloc->type() == relocInfo::opt_virtual_call_type, "wrong reloc. info"); | |
479 } | |
480 | |
481 | |
482 // ---------------------------------------------------------------------------- | |
483 | |
484 void CompiledStaticCall::set_to_clean() { | |
485 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); | |
486 // Reset call site | |
487 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); | |
488 #ifdef ASSERT | |
489 CodeBlob* cb = CodeCache::find_blob_unsafe(this); | |
490 assert(cb != NULL && cb->is_nmethod(), "must be nmethod"); | |
491 #endif | |
492 set_destination_mt_safe(SharedRuntime::get_resolve_static_call_stub()); | |
493 | |
494 // Do not reset stub here: It is too expensive to call find_stub. | |
495 // Instead, rely on caller (nmethod::clear_inline_caches) to clear | |
496 // both the call and its stub. | |
497 } | |
498 | |
499 | |
500 bool CompiledStaticCall::is_clean() const { | |
501 return destination() == SharedRuntime::get_resolve_static_call_stub(); | |
502 } | |
503 | |
504 bool CompiledStaticCall::is_call_to_compiled() const { | |
505 return CodeCache::contains(destination()); | |
506 } | |
507 | |
508 | |
509 bool CompiledStaticCall::is_call_to_interpreted() const { | |
510 // It is a call to interpreted, if it calls to a stub. Hence, the destination | |
511 // must be in the stub part of the nmethod that contains the call | |
512 nmethod* nm = CodeCache::find_nmethod(instruction_address()); | |
513 return nm->stub_contains(destination()); | |
514 } | |
515 | |
516 | |
517 void CompiledStaticCall::set_to_interpreted(methodHandle callee, address entry) { | |
518 address stub=find_stub(); | |
519 assert(stub!=NULL, "stub not found"); | |
520 | |
521 if (TraceICs) { | |
522 ResourceMark rm; | |
523 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s", | |
524 instruction_address(), | |
525 callee->name_and_sig_as_C_string()); | |
526 } | |
527 | |
528 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); // creation also verifies the object | |
529 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); | |
530 | |
531 assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee(), "a) MT-unsafe modification of inline cache"); | |
532 assert(jump->jump_destination() == (address)-1 || jump->jump_destination() == entry, "b) MT-unsafe modification of inline cache"); | |
533 | |
534 // Update stub | |
535 method_holder->set_data((intptr_t)callee()); | |
536 jump->set_jump_destination(entry); | |
537 | |
538 // Update jump to call | |
539 set_destination_mt_safe(stub); | |
540 } | |
541 | |
542 | |
543 void CompiledStaticCall::set(const StaticCallInfo& info) { | |
544 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); | |
545 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); | |
546 // Updating a cache to the wrong entry can cause bugs that are very hard | |
547 // to track down - if cache entry gets invalid - we just clean it. In | |
548 // this way it is always the same code path that is responsible for | |
549 // updating and resolving an inline cache | |
550 assert(is_clean(), "do not update a call entry - use clean"); | |
551 | |
552 if (info._to_interpreter) { | |
553 // Call to interpreted code | |
554 set_to_interpreted(info.callee(), info.entry()); | |
555 } else { | |
556 if (TraceICs) { | |
557 ResourceMark rm; | |
558 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_compiled " INTPTR_FORMAT, | |
559 instruction_address(), | |
560 info.entry()); | |
561 } | |
562 // Call to compiled code | |
563 assert (CodeCache::contains(info.entry()), "wrong entry point"); | |
564 set_destination_mt_safe(info.entry()); | |
565 } | |
566 } | |
567 | |
568 | |
569 // Compute settings for a CompiledStaticCall. Since we might have to set | |
570 // the stub when calling to the interpreter, we need to return arguments. | |
571 void CompiledStaticCall::compute_entry(methodHandle m, StaticCallInfo& info) { | |
572 nmethod* m_code = m->code(); | |
573 info._callee = m; | |
574 if (m_code != NULL) { | |
575 info._to_interpreter = false; | |
576 info._entry = m_code->verified_entry_point(); | |
577 } else { | |
578 // Callee is interpreted code. In any case entering the interpreter | |
579 // puts a converter-frame on the stack to save arguments. | |
580 info._to_interpreter = true; | |
581 info._entry = m()->get_c2i_entry(); | |
582 } | |
583 } | |
584 | |
585 | |
586 void CompiledStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) { | |
587 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); | |
588 // Reset stub | |
589 address stub = static_stub->addr(); | |
590 assert(stub!=NULL, "stub not found"); | |
591 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); // creation also verifies the object | |
592 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); | |
593 method_holder->set_data(0); | |
594 jump->set_jump_destination((address)-1); | |
595 } | |
596 | |
597 | |
598 address CompiledStaticCall::find_stub() { | |
599 // Find reloc. information containing this call-site | |
600 RelocIterator iter((nmethod*)NULL, instruction_address()); | |
601 while (iter.next()) { | |
602 if (iter.addr() == instruction_address()) { | |
603 switch(iter.type()) { | |
604 case relocInfo::static_call_type: | |
605 return iter.static_call_reloc()->static_stub(); | |
606 // We check here for opt_virtual_call_type, since we reuse the code | |
607 // from the CompiledIC implementation | |
608 case relocInfo::opt_virtual_call_type: | |
609 return iter.opt_virtual_call_reloc()->static_stub(); | |
610 case relocInfo::poll_type: | |
611 case relocInfo::poll_return_type: // A safepoint can't overlap a call. | |
612 default: | |
613 ShouldNotReachHere(); | |
614 } | |
615 } | |
616 } | |
617 return NULL; | |
618 } | |
619 | |
620 | |
621 //----------------------------------------------------------------------------- | |
622 // Non-product mode code | |
623 #ifndef PRODUCT | |
624 | |
625 void CompiledIC::verify() { | |
626 // make sure code pattern is actually a call imm32 instruction | |
627 _ic_call->verify(); | |
628 if (os::is_MP()) { | |
629 _ic_call->verify_alignment(); | |
630 } | |
631 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted() | |
632 || is_optimized() || is_megamorphic(), "sanity check"); | |
633 } | |
634 | |
635 | |
636 void CompiledIC::print() { | |
637 print_compiled_ic(); | |
638 tty->cr(); | |
639 } | |
640 | |
641 | |
642 void CompiledIC::print_compiled_ic() { | |
643 tty->print("Inline cache at " INTPTR_FORMAT ", calling %s " INTPTR_FORMAT, | |
644 instruction_address(), is_call_to_interpreted() ? "interpreted " : "", ic_destination()); | |
645 } | |
646 | |
647 | |
648 void CompiledStaticCall::print() { | |
649 tty->print("static call at " INTPTR_FORMAT " -> ", instruction_address()); | |
650 if (is_clean()) { | |
651 tty->print("clean"); | |
652 } else if (is_call_to_compiled()) { | |
653 tty->print("compiled"); | |
654 } else if (is_call_to_interpreted()) { | |
655 tty->print("interpreted"); | |
656 } | |
657 tty->cr(); | |
658 } | |
659 | |
660 void CompiledStaticCall::verify() { | |
661 // Verify call | |
662 NativeCall::verify(); | |
663 if (os::is_MP()) { | |
664 verify_alignment(); | |
665 } | |
666 | |
667 // Verify stub | |
668 address stub = find_stub(); | |
669 assert(stub != NULL, "no stub found for static call"); | |
670 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); // creation also verifies the object | |
671 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); | |
672 | |
673 // Verify state | |
674 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check"); | |
675 } | |
676 | |
677 #endif |