author | jcoomes |
Thu, 07 Apr 2011 17:16:20 -0700 | |
changeset 9178 | 1a022d4f1bc3 |
parent 8076 | 96d498ec7ae1 |
child 8921 | 14bfe81f2a9d |
permissions | -rw-r--r-- |
1 | 1 |
/* |
5702 | 2 |
* Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
1 | 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 |
* |
|
5547
f4b087cbb361
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1
diff
changeset
|
19 |
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
f4b087cbb361
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1
diff
changeset
|
20 |
* or visit www.oracle.com if you need additional information or have any |
f4b087cbb361
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1
diff
changeset
|
21 |
* questions. |
1 | 22 |
* |
23 |
*/ |
|
24 |
||
7397 | 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" |
|
8076
96d498ec7ae1
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
7397
diff
changeset
|
37 |
#include "oops/symbol.hpp" |
7397 | 38 |
#include "runtime/icache.hpp" |
39 |
#include "runtime/sharedRuntime.hpp" |
|
40 |
#include "runtime/stubRoutines.hpp" |
|
41 |
#include "utilities/events.hpp" |
|
1 | 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 |
||
5686
5435e77aa3df
6951083: oops and relocations should part of nmethod not CodeBlob
twisti
parents:
1
diff
changeset
|
459 |
inline static RelocIterator parse_ic(nmethod* nm, address ic_call, oop* &_oop_addr, bool *is_optimized) { |
1 | 460 |
address first_oop = NULL; |
461 |
// Mergers please note: Sun SC5.x CC insists on an lvalue for a reference parameter. |
|
5686
5435e77aa3df
6951083: oops and relocations should part of nmethod not CodeBlob
twisti
parents:
1
diff
changeset
|
462 |
nmethod* tmp_nm = nm; |
5435e77aa3df
6951083: oops and relocations should part of nmethod not CodeBlob
twisti
parents:
1
diff
changeset
|
463 |
return virtual_call_Relocation::parse_ic(tmp_nm, ic_call, first_oop, _oop_addr, is_optimized); |
1 | 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 |