author | drchase |
Fri, 09 May 2014 16:50:54 -0400 | |
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parent 22223 | 82e95c562133 |
child 25359 | 8a19ff205f89 |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#include "precompiled.hpp" |
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#include "classfile/systemDictionary.hpp" |
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#include "code/codeCache.hpp" |
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#include "code/compiledIC.hpp" |
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#include "code/icBuffer.hpp" |
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#include "code/nmethod.hpp" |
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#include "code/vtableStubs.hpp" |
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#include "interpreter/interpreter.hpp" |
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#include "interpreter/linkResolver.hpp" |
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#include "memory/metadataFactory.hpp" |
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#include "memory/oopFactory.hpp" |
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#include "oops/method.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "oops/symbol.hpp" |
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#include "runtime/icache.hpp" |
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#include "runtime/sharedRuntime.hpp" |
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#include "runtime/stubRoutines.hpp" |
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#include "utilities/events.hpp" |
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// Every time a compiled IC is changed or its type is being accessed, |
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// either the CompiledIC_lock must be set or we must be at a safe point. |
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//----------------------------------------------------------------------------- |
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// Low-level access to an inline cache. Private, since they might not be |
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// MT-safe to use. |
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void* CompiledIC::cached_value() const { |
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assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
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assert (!is_optimized(), "an optimized virtual call does not have a cached metadata"); |
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|
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if (!is_in_transition_state()) { |
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void* data = (void*)_value->data(); |
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// If we let the metadata value here be initialized to zero... |
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assert(data != NULL || Universe::non_oop_word() == NULL, |
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"no raw nulls in CompiledIC metadatas, because of patching races"); |
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return (data == (void*)Universe::non_oop_word()) ? NULL : data; |
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} else { |
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return InlineCacheBuffer::cached_value_for((CompiledIC *)this); |
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} |
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} |
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void CompiledIC::internal_set_ic_destination(address entry_point, bool is_icstub, void* cache, bool is_icholder) { |
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assert(entry_point != NULL, "must set legal entry point"); |
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assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
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assert (!is_optimized() || cache == NULL, "an optimized virtual call does not have a cached metadata"); |
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assert (cache == NULL || cache != (Metadata*)badOopVal, "invalid metadata"); |
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assert(!is_icholder || is_icholder_entry(entry_point), "must be"); |
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// Don't use ic_destination for this test since that forwards |
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// through ICBuffer instead of returning the actual current state of |
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// the CompiledIC. |
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if (is_icholder_entry(_ic_call->destination())) { |
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// When patching for the ICStub case the cached value isn't |
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// overwritten until the ICStub copied into the CompiledIC during |
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// the next safepoint. Make sure that the CompiledICHolder* is |
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// marked for release at this point since it won't be identifiable |
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// once the entry point is overwritten. |
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InlineCacheBuffer::queue_for_release((CompiledICHolder*)_value->data()); |
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} |
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if (TraceCompiledIC) { |
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tty->print(" "); |
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print_compiled_ic(); |
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tty->print(" changing destination to " INTPTR_FORMAT, p2i(entry_point)); |
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if (!is_optimized()) { |
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tty->print(" changing cached %s to " INTPTR_FORMAT, is_icholder ? "icholder" : "metadata", p2i((address)cache)); |
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} |
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if (is_icstub) { |
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tty->print(" (icstub)"); |
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} |
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tty->cr(); |
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} |
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{ |
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MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); |
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#ifdef ASSERT |
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CodeBlob* cb = CodeCache::find_blob_unsafe(_ic_call); |
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assert(cb != NULL && cb->is_nmethod(), "must be nmethod"); |
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#endif |
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_ic_call->set_destination_mt_safe(entry_point); |
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} |
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if (is_optimized() || is_icstub) { |
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// Optimized call sites don't have a cache value and ICStub call |
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// sites only change the entry point. Changing the value in that |
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// case could lead to MT safety issues. |
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assert(cache == NULL, "must be null"); |
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return; |
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} |
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if (cache == NULL) cache = (void*)Universe::non_oop_word(); |
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_value->set_data((intptr_t)cache); |
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} |
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void CompiledIC::set_ic_destination(ICStub* stub) { |
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internal_set_ic_destination(stub->code_begin(), true, NULL, false); |
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} |
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address CompiledIC::ic_destination() const { |
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assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
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if (!is_in_transition_state()) { |
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return _ic_call->destination(); |
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} else { |
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return InlineCacheBuffer::ic_destination_for((CompiledIC *)this); |
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} |
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} |
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bool CompiledIC::is_in_transition_state() const { |
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141 |
assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
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return InlineCacheBuffer::contains(_ic_call->destination()); |
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} |
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bool CompiledIC::is_icholder_call() const { |
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assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
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return !_is_optimized && is_icholder_entry(ic_destination()); |
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} |
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// Returns native address of 'call' instruction in inline-cache. Used by |
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// the InlineCacheBuffer when it needs to find the stub. |
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address CompiledIC::stub_address() const { |
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assert(is_in_transition_state(), "should only be called when we are in a transition state"); |
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return _ic_call->destination(); |
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} |
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//----------------------------------------------------------------------------- |
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// High-level access to an inline cache. Guaranteed to be MT-safe. |
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bool CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS) { |
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assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
165 |
assert(!is_optimized(), "cannot set an optimized virtual call to megamorphic"); |
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assert(is_call_to_compiled() || is_call_to_interpreted(), "going directly to megamorphic?"); |
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address entry; |
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if (call_info->call_kind() == CallInfo::itable_call) { |
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assert(bytecode == Bytecodes::_invokeinterface, ""); |
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int itable_index = call_info->itable_index(); |
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entry = VtableStubs::find_itable_stub(itable_index); |
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if (entry == false) { |
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return false; |
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} |
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#ifdef ASSERT |
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int index = call_info->resolved_method()->itable_index(); |
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assert(index == itable_index, "CallInfo pre-computes this"); |
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#endif //ASSERT |
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InstanceKlass* k = call_info->resolved_method()->method_holder(); |
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assert(k->verify_itable_index(itable_index), "sanity check"); |
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InlineCacheBuffer::create_transition_stub(this, k, entry); |
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} else { |
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assert(call_info->call_kind() == CallInfo::vtable_call, "either itable or vtable"); |
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// Can be different than selected_method->vtable_index(), due to package-private etc. |
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int vtable_index = call_info->vtable_index(); |
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assert(call_info->resolved_klass()->verify_vtable_index(vtable_index), "sanity check"); |
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entry = VtableStubs::find_vtable_stub(vtable_index); |
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if (entry == NULL) { |
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return false; |
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} |
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InlineCacheBuffer::create_transition_stub(this, NULL, entry); |
1 | 193 |
} |
194 |
||
195 |
if (TraceICs) { |
|
196 |
ResourceMark rm; |
|
197 |
tty->print_cr ("IC@" INTPTR_FORMAT ": to megamorphic %s entry: " INTPTR_FORMAT, |
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p2i(instruction_address()), call_info->selected_method()->print_value_string(), p2i(entry)); |
1 | 199 |
} |
200 |
||
201 |
// We can't check this anymore. With lazy deopt we could have already |
|
202 |
// cleaned this IC entry before we even return. This is possible if |
|
203 |
// we ran out of space in the inline cache buffer trying to do the |
|
204 |
// set_next and we safepointed to free up space. This is a benign |
|
205 |
// race because the IC entry was complete when we safepointed so |
|
206 |
// cleaning it immediately is harmless. |
|
207 |
// assert(is_megamorphic(), "sanity check"); |
|
20072 | 208 |
return true; |
1 | 209 |
} |
210 |
||
211 |
||
212 |
// true if destination is megamorphic stub |
|
213 |
bool CompiledIC::is_megamorphic() const { |
|
214 |
assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
|
215 |
assert(!is_optimized(), "an optimized call cannot be megamorphic"); |
|
216 |
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// Cannot rely on cached_value. It is either an interface or a method. |
1 | 218 |
return VtableStubs::is_entry_point(ic_destination()); |
219 |
} |
|
220 |
||
221 |
bool CompiledIC::is_call_to_compiled() const { |
|
222 |
assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
|
223 |
||
224 |
// Use unsafe, since an inline cache might point to a zombie method. However, the zombie |
|
225 |
// method is guaranteed to still exist, since we only remove methods after all inline caches |
|
226 |
// has been cleaned up |
|
227 |
CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination()); |
|
228 |
bool is_monomorphic = (cb != NULL && cb->is_nmethod()); |
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229 |
// Check that the cached_value is a klass for non-optimized monomorphic calls |
1 | 230 |
// This assertion is invalid for compiler1: a call that does not look optimized (no static stub) can be used |
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231 |
// for calling directly to vep without using the inline cache (i.e., cached_value == NULL) |
1 | 232 |
#ifdef ASSERT |
233 |
CodeBlob* caller = CodeCache::find_blob_unsafe(instruction_address()); |
|
234 |
bool is_c1_method = caller->is_compiled_by_c1(); |
|
235 |
assert( is_c1_method || |
|
236 |
!is_monomorphic || |
|
237 |
is_optimized() || |
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238 |
(cached_metadata() != NULL && cached_metadata()->is_klass()), "sanity check"); |
1 | 239 |
#endif // ASSERT |
240 |
return is_monomorphic; |
|
241 |
} |
|
242 |
||
243 |
||
244 |
bool CompiledIC::is_call_to_interpreted() const { |
|
245 |
assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
|
246 |
// Call to interpreter if destination is either calling to a stub (if it |
|
247 |
// is optimized), or calling to an I2C blob |
|
248 |
bool is_call_to_interpreted = false; |
|
249 |
if (!is_optimized()) { |
|
250 |
// must use unsafe because the destination can be a zombie (and we're cleaning) |
|
251 |
// and the print_compiled_ic code wants to know if site (in the non-zombie) |
|
252 |
// is to the interpreter. |
|
253 |
CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination()); |
|
254 |
is_call_to_interpreted = (cb != NULL && cb->is_adapter_blob()); |
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255 |
assert(!is_call_to_interpreted || (is_icholder_call() && cached_icholder() != NULL), "sanity check"); |
1 | 256 |
} else { |
257 |
// Check if we are calling into our own codeblob (i.e., to a stub) |
|
258 |
CodeBlob* cb = CodeCache::find_blob(_ic_call->instruction_address()); |
|
259 |
address dest = ic_destination(); |
|
260 |
#ifdef ASSERT |
|
261 |
{ |
|
262 |
CodeBlob* db = CodeCache::find_blob_unsafe(dest); |
|
263 |
assert(!db->is_adapter_blob(), "must use stub!"); |
|
264 |
} |
|
265 |
#endif /* ASSERT */ |
|
266 |
is_call_to_interpreted = cb->contains(dest); |
|
267 |
} |
|
268 |
return is_call_to_interpreted; |
|
269 |
} |
|
270 |
||
271 |
||
272 |
void CompiledIC::set_to_clean() { |
|
273 |
assert(SafepointSynchronize::is_at_safepoint() || CompiledIC_lock->is_locked() , "MT-unsafe call"); |
|
274 |
if (TraceInlineCacheClearing || TraceICs) { |
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tty->print_cr("IC@" INTPTR_FORMAT ": set to clean", p2i(instruction_address())); |
1 | 276 |
print(); |
277 |
} |
|
278 |
||
279 |
address entry; |
|
280 |
if (is_optimized()) { |
|
281 |
entry = SharedRuntime::get_resolve_opt_virtual_call_stub(); |
|
282 |
} else { |
|
283 |
entry = SharedRuntime::get_resolve_virtual_call_stub(); |
|
284 |
} |
|
285 |
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286 |
// A zombie transition will always be safe, since the metadata has already been set to NULL, so |
1 | 287 |
// we only need to patch the destination |
288 |
bool safe_transition = is_optimized() || SafepointSynchronize::is_at_safepoint(); |
|
289 |
||
290 |
if (safe_transition) { |
|
291 |
// Kill any leftover stub we might have too |
|
292 |
if (is_in_transition_state()) { |
|
293 |
ICStub* old_stub = ICStub_from_destination_address(stub_address()); |
|
294 |
old_stub->clear(); |
|
295 |
} |
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296 |
if (is_optimized()) { |
1 | 297 |
set_ic_destination(entry); |
298 |
} else { |
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299 |
set_ic_destination_and_value(entry, (void*)NULL); |
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300 |
} |
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301 |
} else { |
1 | 302 |
// Unsafe transition - create stub. |
303 |
InlineCacheBuffer::create_transition_stub(this, NULL, entry); |
|
304 |
} |
|
305 |
// We can't check this anymore. With lazy deopt we could have already |
|
306 |
// cleaned this IC entry before we even return. This is possible if |
|
307 |
// we ran out of space in the inline cache buffer trying to do the |
|
308 |
// set_next and we safepointed to free up space. This is a benign |
|
309 |
// race because the IC entry was complete when we safepointed so |
|
310 |
// cleaning it immediately is harmless. |
|
311 |
// assert(is_clean(), "sanity check"); |
|
312 |
} |
|
313 |
||
314 |
||
315 |
bool CompiledIC::is_clean() const { |
|
316 |
assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
|
317 |
bool is_clean = false; |
|
318 |
address dest = ic_destination(); |
|
319 |
is_clean = dest == SharedRuntime::get_resolve_opt_virtual_call_stub() || |
|
320 |
dest == SharedRuntime::get_resolve_virtual_call_stub(); |
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321 |
assert(!is_clean || is_optimized() || cached_value() == NULL, "sanity check"); |
1 | 322 |
return is_clean; |
323 |
} |
|
324 |
||
325 |
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326 |
void CompiledIC::set_to_monomorphic(CompiledICInfo& info) { |
1 | 327 |
assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
328 |
// Updating a cache to the wrong entry can cause bugs that are very hard |
|
329 |
// to track down - if cache entry gets invalid - we just clean it. In |
|
330 |
// this way it is always the same code path that is responsible for |
|
331 |
// updating and resolving an inline cache |
|
332 |
// |
|
333 |
// The above is no longer true. SharedRuntime::fixup_callers_callsite will change optimized |
|
334 |
// callsites. In addition ic_miss code will update a site to monomorphic if it determines |
|
335 |
// that an monomorphic call to the interpreter can now be monomorphic to compiled code. |
|
336 |
// |
|
337 |
// In both of these cases the only thing being modifed is the jump/call target and these |
|
338 |
// transitions are mt_safe |
|
339 |
||
340 |
Thread *thread = Thread::current(); |
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341 |
if (info.to_interpreter()) { |
1 | 342 |
// Call to interpreter |
343 |
if (info.is_optimized() && is_optimized()) { |
|
344 |
assert(is_clean(), "unsafe IC path"); |
|
345 |
MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); |
|
346 |
// the call analysis (callee structure) specifies that the call is optimized |
|
347 |
// (either because of CHA or the static target is final) |
|
348 |
// At code generation time, this call has been emitted as static call |
|
349 |
// Call via stub |
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350 |
assert(info.cached_metadata() != NULL && info.cached_metadata()->is_method(), "sanity check"); |
1 | 351 |
CompiledStaticCall* csc = compiledStaticCall_at(instruction_address()); |
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|
352 |
methodHandle method (thread, (Method*)info.cached_metadata()); |
1 | 353 |
csc->set_to_interpreted(method, info.entry()); |
354 |
if (TraceICs) { |
|
355 |
ResourceMark rm(thread); |
|
356 |
tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter: %s", |
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357 |
p2i(instruction_address()), |
1 | 358 |
method->print_value_string()); |
359 |
} |
|
360 |
} else { |
|
361 |
// Call via method-klass-holder |
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|
362 |
InlineCacheBuffer::create_transition_stub(this, info.claim_cached_icholder(), info.entry()); |
1 | 363 |
if (TraceICs) { |
364 |
ResourceMark rm(thread); |
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365 |
tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter via icholder ", p2i(instruction_address())); |
1 | 366 |
} |
367 |
} |
|
368 |
} else { |
|
369 |
// Call to compiled code |
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370 |
bool static_bound = info.is_optimized() || (info.cached_metadata() == NULL); |
1 | 371 |
#ifdef ASSERT |
372 |
CodeBlob* cb = CodeCache::find_blob_unsafe(info.entry()); |
|
373 |
assert (cb->is_nmethod(), "must be compiled!"); |
|
374 |
#endif /* ASSERT */ |
|
375 |
||
376 |
// This is MT safe if we come from a clean-cache and go through a |
|
377 |
// non-verified entry point |
|
378 |
bool safe = SafepointSynchronize::is_at_safepoint() || |
|
379 |
(!is_in_transition_state() && (info.is_optimized() || static_bound || is_clean())); |
|
380 |
||
381 |
if (!safe) { |
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|
382 |
InlineCacheBuffer::create_transition_stub(this, info.cached_metadata(), info.entry()); |
1 | 383 |
} else { |
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384 |
if (is_optimized()) { |
1 | 385 |
set_ic_destination(info.entry()); |
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386 |
} else { |
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387 |
set_ic_destination_and_value(info.entry(), info.cached_metadata()); |
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|
388 |
} |
1 | 389 |
} |
390 |
||
391 |
if (TraceICs) { |
|
392 |
ResourceMark rm(thread); |
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|
393 |
assert(info.cached_metadata() == NULL || info.cached_metadata()->is_klass(), "must be"); |
1 | 394 |
tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to compiled (rcvr klass) %s: %s", |
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395 |
p2i(instruction_address()), |
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|
396 |
((Klass*)info.cached_metadata())->print_value_string(), |
1 | 397 |
(safe) ? "" : "via stub"); |
398 |
} |
|
399 |
} |
|
400 |
// We can't check this anymore. With lazy deopt we could have already |
|
401 |
// cleaned this IC entry before we even return. This is possible if |
|
402 |
// we ran out of space in the inline cache buffer trying to do the |
|
403 |
// set_next and we safepointed to free up space. This is a benign |
|
404 |
// race because the IC entry was complete when we safepointed so |
|
405 |
// cleaning it immediately is harmless. |
|
406 |
// assert(is_call_to_compiled() || is_call_to_interpreted(), "sanity check"); |
|
407 |
} |
|
408 |
||
409 |
||
410 |
// is_optimized: Compiler has generated an optimized call (i.e., no inline |
|
411 |
// cache) static_bound: The call can be static bound (i.e, no need to use |
|
412 |
// inline cache) |
|
413 |
void CompiledIC::compute_monomorphic_entry(methodHandle method, |
|
414 |
KlassHandle receiver_klass, |
|
415 |
bool is_optimized, |
|
416 |
bool static_bound, |
|
417 |
CompiledICInfo& info, |
|
418 |
TRAPS) { |
|
419 |
nmethod* method_code = method->code(); |
|
420 |
address entry = NULL; |
|
22223 | 421 |
if (method_code != NULL && method_code->is_in_use()) { |
1 | 422 |
// Call to compiled code |
423 |
if (static_bound || is_optimized) { |
|
424 |
entry = method_code->verified_entry_point(); |
|
425 |
} else { |
|
426 |
entry = method_code->entry_point(); |
|
427 |
} |
|
428 |
} |
|
429 |
if (entry != NULL) { |
|
430 |
// Call to compiled code |
|
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|
431 |
info.set_compiled_entry(entry, (static_bound || is_optimized) ? NULL : receiver_klass(), is_optimized); |
1 | 432 |
} else { |
433 |
// Note: the following problem exists with Compiler1: |
|
434 |
// - at compile time we may or may not know if the destination is final |
|
435 |
// - if we know that the destination is final, we will emit an optimized |
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436 |
// virtual call (no inline cache), and need a Method* to make a call |
1 | 437 |
// to the interpreter |
438 |
// - if we do not know if the destination is final, we emit a standard |
|
439 |
// virtual call, and use CompiledICHolder to call interpreted code |
|
440 |
// (no static call stub has been generated) |
|
441 |
// However in that case we will now notice it is static_bound |
|
442 |
// and convert the call into what looks to be an optimized |
|
443 |
// virtual call. This causes problems in verifying the IC because |
|
444 |
// it look vanilla but is optimized. Code in is_call_to_interpreted |
|
445 |
// is aware of this and weakens its asserts. |
|
446 |
||
447 |
// static_bound should imply is_optimized -- otherwise we have a |
|
448 |
// performance bug (statically-bindable method is called via |
|
449 |
// dynamically-dispatched call note: the reverse implication isn't |
|
450 |
// necessarily true -- the call may have been optimized based on compiler |
|
451 |
// analysis (static_bound is only based on "final" etc.) |
|
452 |
#ifdef COMPILER2 |
|
453 |
#ifdef TIERED |
|
454 |
#if defined(ASSERT) |
|
455 |
// can't check the assert because we don't have the CompiledIC with which to |
|
456 |
// find the address if the call instruction. |
|
457 |
// |
|
458 |
// CodeBlob* cb = find_blob_unsafe(instruction_address()); |
|
459 |
// assert(cb->is_compiled_by_c1() || !static_bound || is_optimized, "static_bound should imply is_optimized"); |
|
460 |
#endif // ASSERT |
|
461 |
#else |
|
462 |
assert(!static_bound || is_optimized, "static_bound should imply is_optimized"); |
|
463 |
#endif // TIERED |
|
464 |
#endif // COMPILER2 |
|
465 |
if (is_optimized) { |
|
466 |
// Use stub entry |
|
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467 |
info.set_interpreter_entry(method()->get_c2i_entry(), method()); |
1 | 468 |
} else { |
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469 |
// Use icholder entry |
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470 |
CompiledICHolder* holder = new CompiledICHolder(method(), receiver_klass()); |
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|
471 |
info.set_icholder_entry(method()->get_c2i_unverified_entry(), holder); |
1 | 472 |
} |
473 |
} |
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474 |
assert(info.is_optimized() == is_optimized, "must agree"); |
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475 |
} |
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|
476 |
|
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|
477 |
|
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478 |
bool CompiledIC::is_icholder_entry(address entry) { |
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479 |
CodeBlob* cb = CodeCache::find_blob_unsafe(entry); |
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|
480 |
return (cb != NULL && cb->is_adapter_blob()); |
1 | 481 |
} |
482 |
||
483 |
// ---------------------------------------------------------------------------- |
|
484 |
||
485 |
void CompiledStaticCall::set_to_clean() { |
|
486 |
assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); |
|
487 |
// Reset call site |
|
488 |
MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); |
|
489 |
#ifdef ASSERT |
|
490 |
CodeBlob* cb = CodeCache::find_blob_unsafe(this); |
|
491 |
assert(cb != NULL && cb->is_nmethod(), "must be nmethod"); |
|
492 |
#endif |
|
493 |
set_destination_mt_safe(SharedRuntime::get_resolve_static_call_stub()); |
|
494 |
||
495 |
// Do not reset stub here: It is too expensive to call find_stub. |
|
496 |
// Instead, rely on caller (nmethod::clear_inline_caches) to clear |
|
497 |
// both the call and its stub. |
|
498 |
} |
|
499 |
||
500 |
||
501 |
bool CompiledStaticCall::is_clean() const { |
|
502 |
return destination() == SharedRuntime::get_resolve_static_call_stub(); |
|
503 |
} |
|
504 |
||
505 |
bool CompiledStaticCall::is_call_to_compiled() const { |
|
506 |
return CodeCache::contains(destination()); |
|
507 |
} |
|
508 |
||
509 |
||
510 |
bool CompiledStaticCall::is_call_to_interpreted() const { |
|
511 |
// It is a call to interpreted, if it calls to a stub. Hence, the destination |
|
512 |
// must be in the stub part of the nmethod that contains the call |
|
513 |
nmethod* nm = CodeCache::find_nmethod(instruction_address()); |
|
514 |
return nm->stub_contains(destination()); |
|
515 |
} |
|
516 |
||
517 |
void CompiledStaticCall::set(const StaticCallInfo& info) { |
|
518 |
assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); |
|
519 |
MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); |
|
520 |
// Updating a cache to the wrong entry can cause bugs that are very hard |
|
521 |
// to track down - if cache entry gets invalid - we just clean it. In |
|
522 |
// this way it is always the same code path that is responsible for |
|
523 |
// updating and resolving an inline cache |
|
524 |
assert(is_clean(), "do not update a call entry - use clean"); |
|
525 |
||
526 |
if (info._to_interpreter) { |
|
527 |
// Call to interpreted code |
|
528 |
set_to_interpreted(info.callee(), info.entry()); |
|
529 |
} else { |
|
530 |
if (TraceICs) { |
|
531 |
ResourceMark rm; |
|
532 |
tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_compiled " INTPTR_FORMAT, |
|
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|
533 |
p2i(instruction_address()), |
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diff
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|
534 |
p2i(info.entry())); |
1 | 535 |
} |
536 |
// Call to compiled code |
|
537 |
assert (CodeCache::contains(info.entry()), "wrong entry point"); |
|
538 |
set_destination_mt_safe(info.entry()); |
|
539 |
} |
|
540 |
} |
|
541 |
||
542 |
||
543 |
// Compute settings for a CompiledStaticCall. Since we might have to set |
|
544 |
// the stub when calling to the interpreter, we need to return arguments. |
|
545 |
void CompiledStaticCall::compute_entry(methodHandle m, StaticCallInfo& info) { |
|
546 |
nmethod* m_code = m->code(); |
|
547 |
info._callee = m; |
|
22223 | 548 |
if (m_code != NULL && m_code->is_in_use()) { |
1 | 549 |
info._to_interpreter = false; |
550 |
info._entry = m_code->verified_entry_point(); |
|
551 |
} else { |
|
552 |
// Callee is interpreted code. In any case entering the interpreter |
|
553 |
// puts a converter-frame on the stack to save arguments. |
|
554 |
info._to_interpreter = true; |
|
555 |
info._entry = m()->get_c2i_entry(); |
|
556 |
} |
|
557 |
} |
|
558 |
||
559 |
address CompiledStaticCall::find_stub() { |
|
560 |
// Find reloc. information containing this call-site |
|
561 |
RelocIterator iter((nmethod*)NULL, instruction_address()); |
|
562 |
while (iter.next()) { |
|
563 |
if (iter.addr() == instruction_address()) { |
|
564 |
switch(iter.type()) { |
|
565 |
case relocInfo::static_call_type: |
|
566 |
return iter.static_call_reloc()->static_stub(); |
|
567 |
// We check here for opt_virtual_call_type, since we reuse the code |
|
568 |
// from the CompiledIC implementation |
|
569 |
case relocInfo::opt_virtual_call_type: |
|
570 |
return iter.opt_virtual_call_reloc()->static_stub(); |
|
571 |
case relocInfo::poll_type: |
|
572 |
case relocInfo::poll_return_type: // A safepoint can't overlap a call. |
|
573 |
default: |
|
574 |
ShouldNotReachHere(); |
|
575 |
} |
|
576 |
} |
|
577 |
} |
|
578 |
return NULL; |
|
579 |
} |
|
580 |
||
581 |
||
582 |
//----------------------------------------------------------------------------- |
|
583 |
// Non-product mode code |
|
584 |
#ifndef PRODUCT |
|
585 |
||
586 |
void CompiledIC::verify() { |
|
587 |
// make sure code pattern is actually a call imm32 instruction |
|
588 |
_ic_call->verify(); |
|
589 |
if (os::is_MP()) { |
|
590 |
_ic_call->verify_alignment(); |
|
591 |
} |
|
592 |
assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted() |
|
593 |
|| is_optimized() || is_megamorphic(), "sanity check"); |
|
594 |
} |
|
595 |
||
596 |
void CompiledIC::print() { |
|
597 |
print_compiled_ic(); |
|
598 |
tty->cr(); |
|
599 |
} |
|
600 |
||
601 |
void CompiledIC::print_compiled_ic() { |
|
13728
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parents:
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diff
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602 |
tty->print("Inline cache at " INTPTR_FORMAT ", calling %s " INTPTR_FORMAT " cached_value " INTPTR_FORMAT, |
24424
2658d7834c6e
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
22223
diff
changeset
|
603 |
p2i(instruction_address()), is_call_to_interpreted() ? "interpreted " : "", p2i(ic_destination()), p2i(is_optimized() ? NULL : cached_value())); |
1 | 604 |
} |
605 |
||
606 |
void CompiledStaticCall::print() { |
|
24424
2658d7834c6e
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
22223
diff
changeset
|
607 |
tty->print("static call at " INTPTR_FORMAT " -> ", p2i(instruction_address())); |
1 | 608 |
if (is_clean()) { |
609 |
tty->print("clean"); |
|
610 |
} else if (is_call_to_compiled()) { |
|
611 |
tty->print("compiled"); |
|
612 |
} else if (is_call_to_interpreted()) { |
|
613 |
tty->print("interpreted"); |
|
614 |
} |
|
615 |
tty->cr(); |
|
616 |
} |
|
617 |
||
17094
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changeset
|
618 |
#endif // !PRODUCT |