author | coleenp |
Tue, 06 Nov 2012 15:09:37 -0500 | |
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permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2012, 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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#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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// Release the CompiledICHolder* associated with this call site is there is one. |
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void CompiledIC::cleanup_call_site(virtual_call_Relocation* call_site) { |
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// This call site might have become stale so inspect it carefully. |
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NativeCall* call = nativeCall_at(call_site->addr()); |
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if (is_icholder_entry(call->destination())) { |
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NativeMovConstReg* value = nativeMovConstReg_at(call_site->cached_value()); |
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InlineCacheBuffer::queue_for_release((CompiledICHolder*)value->data()); |
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} |
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} |
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bool CompiledIC::is_icholder_call_site(virtual_call_Relocation* call_site) { |
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// This call site might have become stale so inspect it carefully. |
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NativeCall* call = nativeCall_at(call_site->addr()); |
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return is_icholder_entry(call->destination()); |
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} |
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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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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, 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", (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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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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void CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS) { |
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methodHandle method = call_info->selected_method(); |
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bool is_invoke_interface = (bytecode == Bytecodes::_invokeinterface && !call_info->has_vtable_index()); |
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assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
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assert(!is_optimized(), "cannot set an optimized virtual call to megamorphic"); |
|
187 |
assert(is_call_to_compiled() || is_call_to_interpreted(), "going directly to megamorphic?"); |
|
188 |
||
189 |
address entry; |
|
190 |
if (is_invoke_interface) { |
|
191 |
int index = klassItable::compute_itable_index(call_info->resolved_method()()); |
|
192 |
entry = VtableStubs::create_stub(false, index, method()); |
|
193 |
assert(entry != NULL, "entry not computed"); |
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InstanceKlass* k = call_info->resolved_method()->method_holder(); |
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assert(k->is_interface(), "sanity check"); |
1 | 196 |
InlineCacheBuffer::create_transition_stub(this, k, entry); |
197 |
} else { |
|
198 |
// Can be different than method->vtable_index(), due to package-private etc. |
|
199 |
int vtable_index = call_info->vtable_index(); |
|
200 |
entry = VtableStubs::create_stub(true, vtable_index, method()); |
|
201 |
InlineCacheBuffer::create_transition_stub(this, method(), entry); |
|
202 |
} |
|
203 |
||
204 |
if (TraceICs) { |
|
205 |
ResourceMark rm; |
|
206 |
tty->print_cr ("IC@" INTPTR_FORMAT ": to megamorphic %s entry: " INTPTR_FORMAT, |
|
207 |
instruction_address(), method->print_value_string(), entry); |
|
208 |
} |
|
209 |
||
210 |
// We can't check this anymore. With lazy deopt we could have already |
|
211 |
// cleaned this IC entry before we even return. This is possible if |
|
212 |
// we ran out of space in the inline cache buffer trying to do the |
|
213 |
// set_next and we safepointed to free up space. This is a benign |
|
214 |
// race because the IC entry was complete when we safepointed so |
|
215 |
// cleaning it immediately is harmless. |
|
216 |
// assert(is_megamorphic(), "sanity check"); |
|
217 |
} |
|
218 |
||
219 |
||
220 |
// true if destination is megamorphic stub |
|
221 |
bool CompiledIC::is_megamorphic() const { |
|
222 |
assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
|
223 |
assert(!is_optimized(), "an optimized call cannot be megamorphic"); |
|
224 |
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// Cannot rely on cached_value. It is either an interface or a method. |
1 | 226 |
return VtableStubs::is_entry_point(ic_destination()); |
227 |
} |
|
228 |
||
229 |
bool CompiledIC::is_call_to_compiled() const { |
|
230 |
assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
|
231 |
||
232 |
// Use unsafe, since an inline cache might point to a zombie method. However, the zombie |
|
233 |
// method is guaranteed to still exist, since we only remove methods after all inline caches |
|
234 |
// has been cleaned up |
|
235 |
CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination()); |
|
236 |
bool is_monomorphic = (cb != NULL && cb->is_nmethod()); |
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// Check that the cached_value is a klass for non-optimized monomorphic calls |
1 | 238 |
// This assertion is invalid for compiler1: a call that does not look optimized (no static stub) can be used |
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239 |
// for calling directly to vep without using the inline cache (i.e., cached_value == NULL) |
1 | 240 |
#ifdef ASSERT |
241 |
CodeBlob* caller = CodeCache::find_blob_unsafe(instruction_address()); |
|
242 |
bool is_c1_method = caller->is_compiled_by_c1(); |
|
243 |
assert( is_c1_method || |
|
244 |
!is_monomorphic || |
|
245 |
is_optimized() || |
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246 |
(cached_metadata() != NULL && cached_metadata()->is_klass()), "sanity check"); |
1 | 247 |
#endif // ASSERT |
248 |
return is_monomorphic; |
|
249 |
} |
|
250 |
||
251 |
||
252 |
bool CompiledIC::is_call_to_interpreted() const { |
|
253 |
assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
|
254 |
// Call to interpreter if destination is either calling to a stub (if it |
|
255 |
// is optimized), or calling to an I2C blob |
|
256 |
bool is_call_to_interpreted = false; |
|
257 |
if (!is_optimized()) { |
|
258 |
// must use unsafe because the destination can be a zombie (and we're cleaning) |
|
259 |
// and the print_compiled_ic code wants to know if site (in the non-zombie) |
|
260 |
// is to the interpreter. |
|
261 |
CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination()); |
|
262 |
is_call_to_interpreted = (cb != NULL && cb->is_adapter_blob()); |
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assert(!is_call_to_interpreted || (is_icholder_call() && cached_icholder() != NULL), "sanity check"); |
1 | 264 |
} else { |
265 |
// Check if we are calling into our own codeblob (i.e., to a stub) |
|
266 |
CodeBlob* cb = CodeCache::find_blob(_ic_call->instruction_address()); |
|
267 |
address dest = ic_destination(); |
|
268 |
#ifdef ASSERT |
|
269 |
{ |
|
270 |
CodeBlob* db = CodeCache::find_blob_unsafe(dest); |
|
271 |
assert(!db->is_adapter_blob(), "must use stub!"); |
|
272 |
} |
|
273 |
#endif /* ASSERT */ |
|
274 |
is_call_to_interpreted = cb->contains(dest); |
|
275 |
} |
|
276 |
return is_call_to_interpreted; |
|
277 |
} |
|
278 |
||
279 |
||
280 |
void CompiledIC::set_to_clean() { |
|
281 |
assert(SafepointSynchronize::is_at_safepoint() || CompiledIC_lock->is_locked() , "MT-unsafe call"); |
|
282 |
if (TraceInlineCacheClearing || TraceICs) { |
|
283 |
tty->print_cr("IC@" INTPTR_FORMAT ": set to clean", instruction_address()); |
|
284 |
print(); |
|
285 |
} |
|
286 |
||
287 |
address entry; |
|
288 |
if (is_optimized()) { |
|
289 |
entry = SharedRuntime::get_resolve_opt_virtual_call_stub(); |
|
290 |
} else { |
|
291 |
entry = SharedRuntime::get_resolve_virtual_call_stub(); |
|
292 |
} |
|
293 |
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294 |
// A zombie transition will always be safe, since the metadata has already been set to NULL, so |
1 | 295 |
// we only need to patch the destination |
296 |
bool safe_transition = is_optimized() || SafepointSynchronize::is_at_safepoint(); |
|
297 |
||
298 |
if (safe_transition) { |
|
299 |
// Kill any leftover stub we might have too |
|
300 |
if (is_in_transition_state()) { |
|
301 |
ICStub* old_stub = ICStub_from_destination_address(stub_address()); |
|
302 |
old_stub->clear(); |
|
303 |
} |
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304 |
if (is_optimized()) { |
1 | 305 |
set_ic_destination(entry); |
306 |
} else { |
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307 |
set_ic_destination_and_value(entry, (void*)NULL); |
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} |
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309 |
} else { |
1 | 310 |
// Unsafe transition - create stub. |
311 |
InlineCacheBuffer::create_transition_stub(this, NULL, entry); |
|
312 |
} |
|
313 |
// We can't check this anymore. With lazy deopt we could have already |
|
314 |
// cleaned this IC entry before we even return. This is possible if |
|
315 |
// we ran out of space in the inline cache buffer trying to do the |
|
316 |
// set_next and we safepointed to free up space. This is a benign |
|
317 |
// race because the IC entry was complete when we safepointed so |
|
318 |
// cleaning it immediately is harmless. |
|
319 |
// assert(is_clean(), "sanity check"); |
|
320 |
} |
|
321 |
||
322 |
||
323 |
bool CompiledIC::is_clean() const { |
|
324 |
assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
|
325 |
bool is_clean = false; |
|
326 |
address dest = ic_destination(); |
|
327 |
is_clean = dest == SharedRuntime::get_resolve_opt_virtual_call_stub() || |
|
328 |
dest == SharedRuntime::get_resolve_virtual_call_stub(); |
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329 |
assert(!is_clean || is_optimized() || cached_value() == NULL, "sanity check"); |
1 | 330 |
return is_clean; |
331 |
} |
|
332 |
||
333 |
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334 |
void CompiledIC::set_to_monomorphic(CompiledICInfo& info) { |
1 | 335 |
assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), ""); |
336 |
// Updating a cache to the wrong entry can cause bugs that are very hard |
|
337 |
// to track down - if cache entry gets invalid - we just clean it. In |
|
338 |
// this way it is always the same code path that is responsible for |
|
339 |
// updating and resolving an inline cache |
|
340 |
// |
|
341 |
// The above is no longer true. SharedRuntime::fixup_callers_callsite will change optimized |
|
342 |
// callsites. In addition ic_miss code will update a site to monomorphic if it determines |
|
343 |
// that an monomorphic call to the interpreter can now be monomorphic to compiled code. |
|
344 |
// |
|
345 |
// In both of these cases the only thing being modifed is the jump/call target and these |
|
346 |
// transitions are mt_safe |
|
347 |
||
348 |
Thread *thread = Thread::current(); |
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349 |
if (info.to_interpreter()) { |
1 | 350 |
// Call to interpreter |
351 |
if (info.is_optimized() && is_optimized()) { |
|
352 |
assert(is_clean(), "unsafe IC path"); |
|
353 |
MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); |
|
354 |
// the call analysis (callee structure) specifies that the call is optimized |
|
355 |
// (either because of CHA or the static target is final) |
|
356 |
// At code generation time, this call has been emitted as static call |
|
357 |
// Call via stub |
|
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358 |
assert(info.cached_metadata() != NULL && info.cached_metadata()->is_method(), "sanity check"); |
1 | 359 |
CompiledStaticCall* csc = compiledStaticCall_at(instruction_address()); |
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360 |
methodHandle method (thread, (Method*)info.cached_metadata()); |
1 | 361 |
csc->set_to_interpreted(method, info.entry()); |
362 |
if (TraceICs) { |
|
363 |
ResourceMark rm(thread); |
|
364 |
tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter: %s", |
|
365 |
instruction_address(), |
|
366 |
method->print_value_string()); |
|
367 |
} |
|
368 |
} else { |
|
369 |
// Call via method-klass-holder |
|
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370 |
InlineCacheBuffer::create_transition_stub(this, info.claim_cached_icholder(), info.entry()); |
1 | 371 |
if (TraceICs) { |
372 |
ResourceMark rm(thread); |
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373 |
tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter via icholder ", instruction_address()); |
1 | 374 |
} |
375 |
} |
|
376 |
} else { |
|
377 |
// Call to compiled code |
|
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378 |
bool static_bound = info.is_optimized() || (info.cached_metadata() == NULL); |
1 | 379 |
#ifdef ASSERT |
380 |
CodeBlob* cb = CodeCache::find_blob_unsafe(info.entry()); |
|
381 |
assert (cb->is_nmethod(), "must be compiled!"); |
|
382 |
#endif /* ASSERT */ |
|
383 |
||
384 |
// This is MT safe if we come from a clean-cache and go through a |
|
385 |
// non-verified entry point |
|
386 |
bool safe = SafepointSynchronize::is_at_safepoint() || |
|
387 |
(!is_in_transition_state() && (info.is_optimized() || static_bound || is_clean())); |
|
388 |
||
389 |
if (!safe) { |
|
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390 |
InlineCacheBuffer::create_transition_stub(this, info.cached_metadata(), info.entry()); |
1 | 391 |
} else { |
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392 |
if (is_optimized()) { |
1 | 393 |
set_ic_destination(info.entry()); |
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394 |
} else { |
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395 |
set_ic_destination_and_value(info.entry(), info.cached_metadata()); |
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|
396 |
} |
1 | 397 |
} |
398 |
||
399 |
if (TraceICs) { |
|
400 |
ResourceMark rm(thread); |
|
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|
401 |
assert(info.cached_metadata() == NULL || info.cached_metadata()->is_klass(), "must be"); |
1 | 402 |
tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to compiled (rcvr klass) %s: %s", |
403 |
instruction_address(), |
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404 |
((Klass*)info.cached_metadata())->print_value_string(), |
1 | 405 |
(safe) ? "" : "via stub"); |
406 |
} |
|
407 |
} |
|
408 |
// We can't check this anymore. With lazy deopt we could have already |
|
409 |
// cleaned this IC entry before we even return. This is possible if |
|
410 |
// we ran out of space in the inline cache buffer trying to do the |
|
411 |
// set_next and we safepointed to free up space. This is a benign |
|
412 |
// race because the IC entry was complete when we safepointed so |
|
413 |
// cleaning it immediately is harmless. |
|
414 |
// assert(is_call_to_compiled() || is_call_to_interpreted(), "sanity check"); |
|
415 |
} |
|
416 |
||
417 |
||
418 |
// is_optimized: Compiler has generated an optimized call (i.e., no inline |
|
419 |
// cache) static_bound: The call can be static bound (i.e, no need to use |
|
420 |
// inline cache) |
|
421 |
void CompiledIC::compute_monomorphic_entry(methodHandle method, |
|
422 |
KlassHandle receiver_klass, |
|
423 |
bool is_optimized, |
|
424 |
bool static_bound, |
|
425 |
CompiledICInfo& info, |
|
426 |
TRAPS) { |
|
427 |
nmethod* method_code = method->code(); |
|
428 |
address entry = NULL; |
|
429 |
if (method_code != NULL) { |
|
430 |
// Call to compiled code |
|
431 |
if (static_bound || is_optimized) { |
|
432 |
entry = method_code->verified_entry_point(); |
|
433 |
} else { |
|
434 |
entry = method_code->entry_point(); |
|
435 |
} |
|
436 |
} |
|
437 |
if (entry != NULL) { |
|
438 |
// Call to compiled code |
|
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|
439 |
info.set_compiled_entry(entry, (static_bound || is_optimized) ? NULL : receiver_klass(), is_optimized); |
1 | 440 |
} else { |
441 |
// Note: the following problem exists with Compiler1: |
|
442 |
// - at compile time we may or may not know if the destination is final |
|
443 |
// - if we know that the destination is final, we will emit an optimized |
|
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444 |
// virtual call (no inline cache), and need a Method* to make a call |
1 | 445 |
// to the interpreter |
446 |
// - if we do not know if the destination is final, we emit a standard |
|
447 |
// virtual call, and use CompiledICHolder to call interpreted code |
|
448 |
// (no static call stub has been generated) |
|
449 |
// However in that case we will now notice it is static_bound |
|
450 |
// and convert the call into what looks to be an optimized |
|
451 |
// virtual call. This causes problems in verifying the IC because |
|
452 |
// it look vanilla but is optimized. Code in is_call_to_interpreted |
|
453 |
// is aware of this and weakens its asserts. |
|
454 |
||
455 |
// static_bound should imply is_optimized -- otherwise we have a |
|
456 |
// performance bug (statically-bindable method is called via |
|
457 |
// dynamically-dispatched call note: the reverse implication isn't |
|
458 |
// necessarily true -- the call may have been optimized based on compiler |
|
459 |
// analysis (static_bound is only based on "final" etc.) |
|
460 |
#ifdef COMPILER2 |
|
461 |
#ifdef TIERED |
|
462 |
#if defined(ASSERT) |
|
463 |
// can't check the assert because we don't have the CompiledIC with which to |
|
464 |
// find the address if the call instruction. |
|
465 |
// |
|
466 |
// CodeBlob* cb = find_blob_unsafe(instruction_address()); |
|
467 |
// assert(cb->is_compiled_by_c1() || !static_bound || is_optimized, "static_bound should imply is_optimized"); |
|
468 |
#endif // ASSERT |
|
469 |
#else |
|
470 |
assert(!static_bound || is_optimized, "static_bound should imply is_optimized"); |
|
471 |
#endif // TIERED |
|
472 |
#endif // COMPILER2 |
|
473 |
if (is_optimized) { |
|
474 |
// Use stub entry |
|
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475 |
info.set_interpreter_entry(method()->get_c2i_entry(), method()); |
1 | 476 |
} else { |
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477 |
// Use icholder entry |
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478 |
CompiledICHolder* holder = new CompiledICHolder(method(), receiver_klass()); |
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479 |
info.set_icholder_entry(method()->get_c2i_unverified_entry(), holder); |
1 | 480 |
} |
481 |
} |
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482 |
assert(info.is_optimized() == is_optimized, "must agree"); |
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483 |
} |
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|
484 |
|
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|
485 |
|
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486 |
bool CompiledIC::is_icholder_entry(address entry) { |
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487 |
CodeBlob* cb = CodeCache::find_blob_unsafe(entry); |
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return (cb != NULL && cb->is_adapter_blob()); |
1 | 489 |
} |
490 |
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491 |
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492 |
CompiledIC::CompiledIC(nmethod* nm, NativeCall* call) |
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493 |
: _ic_call(call) |
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|
494 |
{ |
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495 |
address ic_call = call->instruction_address(); |
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|
496 |
|
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497 |
assert(ic_call != NULL, "ic_call address must be set"); |
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498 |
assert(nm != NULL, "must pass nmethod"); |
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499 |
assert(nm->contains(ic_call), "must be in nmethod"); |
1 | 500 |
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// search for the ic_call at the given address |
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502 |
RelocIterator iter(nm, ic_call, ic_call+1); |
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503 |
bool ret = iter.next(); |
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504 |
assert(ret == true, "relocInfo must exist at this address"); |
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505 |
assert(iter.addr() == ic_call, "must find ic_call"); |
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506 |
if (iter.type() == relocInfo::virtual_call_type) { |
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507 |
virtual_call_Relocation* r = iter.virtual_call_reloc(); |
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508 |
_is_optimized = false; |
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509 |
_value = nativeMovConstReg_at(r->cached_value()); |
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510 |
} else { |
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511 |
assert(iter.type() == relocInfo::opt_virtual_call_type, "must be a virtual call"); |
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512 |
_is_optimized = true; |
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513 |
_value = NULL; |
1 | 514 |
} |
515 |
} |
|
516 |
||
517 |
||
518 |
// ---------------------------------------------------------------------------- |
|
519 |
||
520 |
void CompiledStaticCall::set_to_clean() { |
|
521 |
assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); |
|
522 |
// Reset call site |
|
523 |
MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); |
|
524 |
#ifdef ASSERT |
|
525 |
CodeBlob* cb = CodeCache::find_blob_unsafe(this); |
|
526 |
assert(cb != NULL && cb->is_nmethod(), "must be nmethod"); |
|
527 |
#endif |
|
528 |
set_destination_mt_safe(SharedRuntime::get_resolve_static_call_stub()); |
|
529 |
||
530 |
// Do not reset stub here: It is too expensive to call find_stub. |
|
531 |
// Instead, rely on caller (nmethod::clear_inline_caches) to clear |
|
532 |
// both the call and its stub. |
|
533 |
} |
|
534 |
||
535 |
||
536 |
bool CompiledStaticCall::is_clean() const { |
|
537 |
return destination() == SharedRuntime::get_resolve_static_call_stub(); |
|
538 |
} |
|
539 |
||
540 |
bool CompiledStaticCall::is_call_to_compiled() const { |
|
541 |
return CodeCache::contains(destination()); |
|
542 |
} |
|
543 |
||
544 |
||
545 |
bool CompiledStaticCall::is_call_to_interpreted() const { |
|
546 |
// It is a call to interpreted, if it calls to a stub. Hence, the destination |
|
547 |
// must be in the stub part of the nmethod that contains the call |
|
548 |
nmethod* nm = CodeCache::find_nmethod(instruction_address()); |
|
549 |
return nm->stub_contains(destination()); |
|
550 |
} |
|
551 |
||
552 |
||
553 |
void CompiledStaticCall::set_to_interpreted(methodHandle callee, address entry) { |
|
554 |
address stub=find_stub(); |
|
555 |
assert(stub!=NULL, "stub not found"); |
|
556 |
||
557 |
if (TraceICs) { |
|
558 |
ResourceMark rm; |
|
559 |
tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s", |
|
560 |
instruction_address(), |
|
561 |
callee->name_and_sig_as_C_string()); |
|
562 |
} |
|
563 |
||
564 |
NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); // creation also verifies the object |
|
565 |
NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); |
|
566 |
||
567 |
assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee(), "a) MT-unsafe modification of inline cache"); |
|
568 |
assert(jump->jump_destination() == (address)-1 || jump->jump_destination() == entry, "b) MT-unsafe modification of inline cache"); |
|
569 |
||
570 |
// Update stub |
|
571 |
method_holder->set_data((intptr_t)callee()); |
|
572 |
jump->set_jump_destination(entry); |
|
573 |
||
574 |
// Update jump to call |
|
575 |
set_destination_mt_safe(stub); |
|
576 |
} |
|
577 |
||
578 |
||
579 |
void CompiledStaticCall::set(const StaticCallInfo& info) { |
|
580 |
assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); |
|
581 |
MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); |
|
582 |
// Updating a cache to the wrong entry can cause bugs that are very hard |
|
583 |
// to track down - if cache entry gets invalid - we just clean it. In |
|
584 |
// this way it is always the same code path that is responsible for |
|
585 |
// updating and resolving an inline cache |
|
586 |
assert(is_clean(), "do not update a call entry - use clean"); |
|
587 |
||
588 |
if (info._to_interpreter) { |
|
589 |
// Call to interpreted code |
|
590 |
set_to_interpreted(info.callee(), info.entry()); |
|
591 |
} else { |
|
592 |
if (TraceICs) { |
|
593 |
ResourceMark rm; |
|
594 |
tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_compiled " INTPTR_FORMAT, |
|
595 |
instruction_address(), |
|
596 |
info.entry()); |
|
597 |
} |
|
598 |
// Call to compiled code |
|
599 |
assert (CodeCache::contains(info.entry()), "wrong entry point"); |
|
600 |
set_destination_mt_safe(info.entry()); |
|
601 |
} |
|
602 |
} |
|
603 |
||
604 |
||
605 |
// Compute settings for a CompiledStaticCall. Since we might have to set |
|
606 |
// the stub when calling to the interpreter, we need to return arguments. |
|
607 |
void CompiledStaticCall::compute_entry(methodHandle m, StaticCallInfo& info) { |
|
608 |
nmethod* m_code = m->code(); |
|
609 |
info._callee = m; |
|
610 |
if (m_code != NULL) { |
|
611 |
info._to_interpreter = false; |
|
612 |
info._entry = m_code->verified_entry_point(); |
|
613 |
} else { |
|
614 |
// Callee is interpreted code. In any case entering the interpreter |
|
615 |
// puts a converter-frame on the stack to save arguments. |
|
616 |
info._to_interpreter = true; |
|
617 |
info._entry = m()->get_c2i_entry(); |
|
618 |
} |
|
619 |
} |
|
620 |
||
621 |
||
622 |
void CompiledStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) { |
|
623 |
assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); |
|
624 |
// Reset stub |
|
625 |
address stub = static_stub->addr(); |
|
626 |
assert(stub!=NULL, "stub not found"); |
|
627 |
NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); // creation also verifies the object |
|
628 |
NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); |
|
629 |
method_holder->set_data(0); |
|
630 |
jump->set_jump_destination((address)-1); |
|
631 |
} |
|
632 |
||
633 |
||
634 |
address CompiledStaticCall::find_stub() { |
|
635 |
// Find reloc. information containing this call-site |
|
636 |
RelocIterator iter((nmethod*)NULL, instruction_address()); |
|
637 |
while (iter.next()) { |
|
638 |
if (iter.addr() == instruction_address()) { |
|
639 |
switch(iter.type()) { |
|
640 |
case relocInfo::static_call_type: |
|
641 |
return iter.static_call_reloc()->static_stub(); |
|
642 |
// We check here for opt_virtual_call_type, since we reuse the code |
|
643 |
// from the CompiledIC implementation |
|
644 |
case relocInfo::opt_virtual_call_type: |
|
645 |
return iter.opt_virtual_call_reloc()->static_stub(); |
|
646 |
case relocInfo::poll_type: |
|
647 |
case relocInfo::poll_return_type: // A safepoint can't overlap a call. |
|
648 |
default: |
|
649 |
ShouldNotReachHere(); |
|
650 |
} |
|
651 |
} |
|
652 |
} |
|
653 |
return NULL; |
|
654 |
} |
|
655 |
||
656 |
||
657 |
//----------------------------------------------------------------------------- |
|
658 |
// Non-product mode code |
|
659 |
#ifndef PRODUCT |
|
660 |
||
661 |
void CompiledIC::verify() { |
|
662 |
// make sure code pattern is actually a call imm32 instruction |
|
663 |
_ic_call->verify(); |
|
664 |
if (os::is_MP()) { |
|
665 |
_ic_call->verify_alignment(); |
|
666 |
} |
|
667 |
assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted() |
|
668 |
|| is_optimized() || is_megamorphic(), "sanity check"); |
|
669 |
} |
|
670 |
||
671 |
||
672 |
void CompiledIC::print() { |
|
673 |
print_compiled_ic(); |
|
674 |
tty->cr(); |
|
675 |
} |
|
676 |
||
677 |
||
678 |
void CompiledIC::print_compiled_ic() { |
|
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679 |
tty->print("Inline cache at " INTPTR_FORMAT ", calling %s " INTPTR_FORMAT " cached_value " INTPTR_FORMAT, |
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680 |
instruction_address(), is_call_to_interpreted() ? "interpreted " : "", ic_destination(), is_optimized() ? NULL : cached_value()); |
1 | 681 |
} |
682 |
||
683 |
||
684 |
void CompiledStaticCall::print() { |
|
685 |
tty->print("static call at " INTPTR_FORMAT " -> ", instruction_address()); |
|
686 |
if (is_clean()) { |
|
687 |
tty->print("clean"); |
|
688 |
} else if (is_call_to_compiled()) { |
|
689 |
tty->print("compiled"); |
|
690 |
} else if (is_call_to_interpreted()) { |
|
691 |
tty->print("interpreted"); |
|
692 |
} |
|
693 |
tty->cr(); |
|
694 |
} |
|
695 |
||
696 |
void CompiledStaticCall::verify() { |
|
697 |
// Verify call |
|
698 |
NativeCall::verify(); |
|
699 |
if (os::is_MP()) { |
|
700 |
verify_alignment(); |
|
701 |
} |
|
702 |
||
703 |
// Verify stub |
|
704 |
address stub = find_stub(); |
|
705 |
assert(stub != NULL, "no stub found for static call"); |
|
706 |
NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); // creation also verifies the object |
|
707 |
NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); |
|
708 |
||
709 |
// Verify state |
|
710 |
assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check"); |
|
711 |
} |
|
712 |
||
713 |
#endif |