author | hseigel |
Mon, 10 Oct 2016 08:34:32 -0400 | |
changeset 41691 | 1be281ee5de4 |
parent 41183 | 207b92e69457 |
child 42073 | 89e056fd82cc |
permissions | -rw-r--r-- |
36508 | 1 |
/* |
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* Copyright (c) 2016, 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/classLoaderData.hpp" |
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#include "classfile/javaClasses.hpp" |
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#include "classfile/moduleEntry.hpp" |
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#include "logging/log.hpp" |
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#include "memory/resourceArea.hpp" |
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#include "oops/symbol.hpp" |
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#include "prims/jni.h" |
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#include "runtime/handles.inline.hpp" |
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#include "runtime/safepoint.hpp" |
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#include "trace/traceMacros.hpp" |
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#include "utilities/events.hpp" |
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#include "utilities/growableArray.hpp" |
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#include "utilities/hashtable.inline.hpp" |
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#include "utilities/ostream.hpp" |
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ModuleEntry* ModuleEntryTable::_javabase_module = NULL; |
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void ModuleEntry::set_location(Symbol* location) { |
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if (_location != NULL) { |
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// _location symbol's refcounts are managed by ModuleEntry, |
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// must decrement the old one before updating. |
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_location->decrement_refcount(); |
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} |
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_location = location; |
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if (location != NULL) { |
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location->increment_refcount(); |
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} |
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} |
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void ModuleEntry::set_version(Symbol* version) { |
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if (_version != NULL) { |
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// _version symbol's refcounts are managed by ModuleEntry, |
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// must decrement the old one before updating. |
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_version->decrement_refcount(); |
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} |
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_version = version; |
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if (version != NULL) { |
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version->increment_refcount(); |
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} |
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} |
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// Returns the shared ProtectionDomain |
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Handle ModuleEntry::shared_protection_domain() { |
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return Handle(JNIHandles::resolve(_pd)); |
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} |
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// Set the shared ProtectionDomain atomically |
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void ModuleEntry::set_shared_protection_domain(ClassLoaderData *loader_data, |
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Handle pd_h) { |
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// Create a JNI handle for the shared ProtectionDomain and save it atomically. |
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// If someone beats us setting the _pd cache, the created JNI handle is destroyed. |
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jobject obj = loader_data->add_handle(pd_h); |
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if (Atomic::cmpxchg_ptr(obj, &_pd, NULL) != NULL) { |
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loader_data->remove_handle(obj); |
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} |
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} |
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// Returns true if this module can read module m |
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bool ModuleEntry::can_read(ModuleEntry* m) const { |
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assert(m != NULL, "No module to lookup in this module's reads list"); |
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// Unnamed modules read everyone and all modules |
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// read java.base. If either of these conditions |
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// hold, readability has been established. |
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if (!this->is_named() || |
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(m == ModuleEntryTable::javabase_moduleEntry())) { |
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return true; |
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} |
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MutexLocker m1(Module_lock); |
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if (!has_reads()) { |
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return false; |
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} else { |
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return _reads->contains(m); |
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} |
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} |
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// Add a new module to this module's reads list |
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void ModuleEntry::add_read(ModuleEntry* m) { |
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MutexLocker m1(Module_lock); |
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if (m == NULL) { |
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set_can_read_all_unnamed(); |
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} else { |
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if (_reads == NULL) { |
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// Lazily create a module's reads list |
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_reads = new (ResourceObj::C_HEAP, mtModule)GrowableArray<ModuleEntry*>(MODULE_READS_SIZE, true); |
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} |
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// Determine, based on this newly established read edge to module m, |
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// if this module's read list should be walked at a GC safepoint. |
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set_read_walk_required(m->loader_data()); |
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// Establish readability to module m |
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_reads->append_if_missing(m); |
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} |
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} |
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// If the module's loader, that a read edge is being established to, is |
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// not the same loader as this module's and is not one of the 3 builtin |
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// class loaders, then this module's reads list must be walked at GC |
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// safepoint. Modules have the same life cycle as their defining class |
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// loaders and should be removed if dead. |
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void ModuleEntry::set_read_walk_required(ClassLoaderData* m_loader_data) { |
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assert_locked_or_safepoint(Module_lock); |
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if (!_must_walk_reads && |
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loader_data() != m_loader_data && |
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!m_loader_data->is_builtin_class_loader_data()) { |
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_must_walk_reads = true; |
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if (log_is_enabled(Trace, modules)) { |
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ResourceMark rm; |
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log_trace(modules)("ModuleEntry::set_read_walk_required(): module %s reads list must be walked", |
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(name() != NULL) ? name()->as_C_string() : UNNAMED_MODULE); |
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} |
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} |
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} |
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36508 | 146 |
bool ModuleEntry::has_reads() const { |
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assert_locked_or_safepoint(Module_lock); |
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return ((_reads != NULL) && !_reads->is_empty()); |
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} |
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// Purge dead module entries out of reads list. |
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void ModuleEntry::purge_reads() { |
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assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
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if (_must_walk_reads && has_reads()) { |
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// This module's _must_walk_reads flag will be reset based |
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// on the remaining live modules on the reads list. |
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_must_walk_reads = false; |
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if (log_is_enabled(Trace, modules)) { |
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ResourceMark rm; |
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log_trace(modules)("ModuleEntry::purge_reads(): module %s reads list being walked", |
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(name() != NULL) ? name()->as_C_string() : UNNAMED_MODULE); |
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} |
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36508 | 166 |
// Go backwards because this removes entries that are dead. |
167 |
int len = _reads->length(); |
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for (int idx = len - 1; idx >= 0; idx--) { |
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ModuleEntry* module_idx = _reads->at(idx); |
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ClassLoaderData* cld_idx = module_idx->loader_data(); |
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if (cld_idx->is_unloading()) { |
36508 | 172 |
_reads->delete_at(idx); |
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} else { |
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// Update the need to walk this module's reads based on live modules |
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set_read_walk_required(cld_idx); |
36508 | 176 |
} |
177 |
} |
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178 |
} |
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179 |
} |
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180 |
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181 |
void ModuleEntry::module_reads_do(ModuleClosure* const f) { |
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182 |
assert_locked_or_safepoint(Module_lock); |
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183 |
assert(f != NULL, "invariant"); |
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184 |
||
185 |
if (has_reads()) { |
|
186 |
int reads_len = _reads->length(); |
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187 |
for (int i = 0; i < reads_len; ++i) { |
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188 |
f->do_module(_reads->at(i)); |
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189 |
} |
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190 |
} |
|
191 |
} |
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192 |
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193 |
void ModuleEntry::delete_reads() { |
|
194 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
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195 |
delete _reads; |
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196 |
_reads = NULL; |
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197 |
} |
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198 |
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199 |
ModuleEntryTable::ModuleEntryTable(int table_size) |
|
38733 | 200 |
: Hashtable<Symbol*, mtModule>(table_size, sizeof(ModuleEntry)), _unnamed_module(NULL) |
36508 | 201 |
{ |
202 |
} |
|
203 |
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204 |
ModuleEntryTable::~ModuleEntryTable() { |
|
205 |
assert_locked_or_safepoint(Module_lock); |
|
206 |
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207 |
// Walk through all buckets and all entries in each bucket, |
|
208 |
// freeing each entry. |
|
209 |
for (int i = 0; i < table_size(); ++i) { |
|
210 |
for (ModuleEntry* m = bucket(i); m != NULL;) { |
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211 |
ModuleEntry* to_remove = m; |
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212 |
// read next before freeing. |
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213 |
m = m->next(); |
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214 |
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215 |
ResourceMark rm; |
|
216 |
log_debug(modules)("ModuleEntryTable: deleting module: %s", to_remove->name() != NULL ? |
|
217 |
to_remove->name()->as_C_string() : UNNAMED_MODULE); |
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218 |
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219 |
// Clean out the C heap allocated reads list first before freeing the entry |
|
220 |
to_remove->delete_reads(); |
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221 |
if (to_remove->name() != NULL) { |
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222 |
to_remove->name()->decrement_refcount(); |
|
223 |
} |
|
224 |
if (to_remove->version() != NULL) { |
|
225 |
to_remove->version()->decrement_refcount(); |
|
226 |
} |
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227 |
if (to_remove->location() != NULL) { |
|
228 |
to_remove->location()->decrement_refcount(); |
|
229 |
} |
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230 |
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231 |
// Unlink from the Hashtable prior to freeing |
|
232 |
unlink_entry(to_remove); |
|
233 |
FREE_C_HEAP_ARRAY(char, to_remove); |
|
234 |
} |
|
235 |
} |
|
236 |
assert(number_of_entries() == 0, "should have removed all entries"); |
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237 |
assert(new_entry_free_list() == NULL, "entry present on ModuleEntryTable's free list"); |
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238 |
free_buckets(); |
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239 |
} |
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240 |
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241 |
void ModuleEntryTable::create_unnamed_module(ClassLoaderData* loader_data) { |
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assert(Module_lock->owned_by_self(), "should have the Module_lock"); |
36508 | 243 |
|
244 |
// Each ModuleEntryTable has exactly one unnamed module |
|
245 |
if (loader_data->is_the_null_class_loader_data()) { |
|
246 |
// For the boot loader, the java.lang.reflect.Module for the unnamed module |
|
247 |
// is not known until a call to JVM_SetBootLoaderUnnamedModule is made. At |
|
248 |
// this point initially create the ModuleEntry for the unnamed module. |
|
249 |
_unnamed_module = new_entry(0, Handle(NULL), NULL, NULL, NULL, loader_data); |
|
250 |
} else { |
|
251 |
// For all other class loaders the java.lang.reflect.Module for their |
|
252 |
// corresponding unnamed module can be found in the java.lang.ClassLoader object. |
|
253 |
oop module = java_lang_ClassLoader::unnamedModule(loader_data->class_loader()); |
|
254 |
_unnamed_module = new_entry(0, Handle(module), NULL, NULL, NULL, loader_data); |
|
255 |
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256 |
// Store pointer to the ModuleEntry in the unnamed module's java.lang.reflect.Module |
|
257 |
// object. |
|
258 |
java_lang_reflect_Module::set_module_entry(module, _unnamed_module); |
|
259 |
} |
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260 |
||
261 |
// Add to bucket 0, no name to hash on |
|
262 |
add_entry(0, _unnamed_module); |
|
263 |
} |
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264 |
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265 |
ModuleEntry* ModuleEntryTable::new_entry(unsigned int hash, Handle module_handle, Symbol* name, |
|
266 |
Symbol* version, Symbol* location, |
|
267 |
ClassLoaderData* loader_data) { |
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assert(Module_lock->owned_by_self(), "should have the Module_lock"); |
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ModuleEntry* entry = (ModuleEntry*) NEW_C_HEAP_ARRAY(char, entry_size(), mtModule); |
36508 | 270 |
|
271 |
// Initialize everything BasicHashtable would |
|
272 |
entry->set_next(NULL); |
|
273 |
entry->set_hash(hash); |
|
274 |
entry->set_literal(name); |
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275 |
||
276 |
// Initialize fields specific to a ModuleEntry |
|
277 |
entry->init(); |
|
278 |
if (name != NULL) { |
|
279 |
name->increment_refcount(); |
|
280 |
} else { |
|
281 |
// Unnamed modules can read all other unnamed modules. |
|
282 |
entry->set_can_read_all_unnamed(); |
|
283 |
} |
|
284 |
||
285 |
if (!module_handle.is_null()) { |
|
286 |
entry->set_module(loader_data->add_handle(module_handle)); |
|
287 |
} |
|
288 |
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entry->set_loader_data(loader_data); |
36508 | 290 |
entry->set_version(version); |
291 |
entry->set_location(location); |
|
292 |
||
293 |
TRACE_INIT_MODULE_ID(entry); |
|
294 |
||
295 |
return entry; |
|
296 |
} |
|
297 |
||
298 |
void ModuleEntryTable::add_entry(int index, ModuleEntry* new_entry) { |
|
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assert(Module_lock->owned_by_self(), "should have the Module_lock"); |
38733 | 300 |
Hashtable<Symbol*, mtModule>::add_entry(index, (HashtableEntry<Symbol*, mtModule>*)new_entry); |
36508 | 301 |
} |
302 |
||
303 |
ModuleEntry* ModuleEntryTable::locked_create_entry_or_null(Handle module_handle, |
|
304 |
Symbol* module_name, |
|
305 |
Symbol* module_version, |
|
306 |
Symbol* module_location, |
|
307 |
ClassLoaderData* loader_data) { |
|
308 |
assert(module_name != NULL, "ModuleEntryTable locked_create_entry_or_null should never be called for unnamed module."); |
|
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assert(Module_lock->owned_by_self(), "should have the Module_lock"); |
36508 | 310 |
// Check if module already exists. |
311 |
if (lookup_only(module_name) != NULL) { |
|
312 |
return NULL; |
|
313 |
} else { |
|
314 |
ModuleEntry* entry = new_entry(compute_hash(module_name), module_handle, module_name, |
|
315 |
module_version, module_location, loader_data); |
|
316 |
add_entry(index_for(module_name), entry); |
|
317 |
return entry; |
|
318 |
} |
|
319 |
} |
|
320 |
||
321 |
// lookup_only by Symbol* to find a ModuleEntry. |
|
322 |
ModuleEntry* ModuleEntryTable::lookup_only(Symbol* name) { |
|
323 |
if (name == NULL) { |
|
324 |
// Return this table's unnamed module |
|
325 |
return unnamed_module(); |
|
326 |
} |
|
327 |
int index = index_for(name); |
|
328 |
for (ModuleEntry* m = bucket(index); m != NULL; m = m->next()) { |
|
329 |
if (m->name()->fast_compare(name) == 0) { |
|
330 |
return m; |
|
331 |
} |
|
332 |
} |
|
333 |
return NULL; |
|
334 |
} |
|
335 |
||
336 |
// Remove dead modules from all other alive modules' reads list. |
|
337 |
// This should only occur at class unloading. |
|
338 |
void ModuleEntryTable::purge_all_module_reads() { |
|
339 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
|
340 |
for (int i = 0; i < table_size(); i++) { |
|
341 |
for (ModuleEntry* entry = bucket(i); |
|
342 |
entry != NULL; |
|
343 |
entry = entry->next()) { |
|
344 |
entry->purge_reads(); |
|
345 |
} |
|
346 |
} |
|
347 |
} |
|
348 |
||
349 |
void ModuleEntryTable::finalize_javabase(Handle module_handle, Symbol* version, Symbol* location) { |
|
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350 |
assert(Module_lock->owned_by_self(), "should have the Module_lock"); |
36508 | 351 |
ClassLoaderData* boot_loader_data = ClassLoaderData::the_null_class_loader_data(); |
352 |
ModuleEntryTable* module_table = boot_loader_data->modules(); |
|
353 |
||
354 |
assert(module_table != NULL, "boot loader's ModuleEntryTable not defined"); |
|
355 |
||
356 |
if (module_handle.is_null()) { |
|
357 |
fatal("Unable to finalize module definition for java.base"); |
|
358 |
} |
|
359 |
||
360 |
// Set java.lang.reflect.Module, version and location for java.base |
|
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361 |
ModuleEntry* jb_module = javabase_moduleEntry(); |
36508 | 362 |
assert(jb_module != NULL, "java.base ModuleEntry not defined"); |
363 |
jb_module->set_version(version); |
|
364 |
jb_module->set_location(location); |
|
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|
365 |
// Once java.base's ModuleEntry _module field is set with the known |
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|
366 |
// java.lang.reflect.Module, java.base is considered "defined" to the VM. |
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367 |
jb_module->set_module(boot_loader_data->add_handle(module_handle)); |
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|
368 |
|
36508 | 369 |
// Store pointer to the ModuleEntry for java.base in the java.lang.reflect.Module object. |
370 |
java_lang_reflect_Module::set_module_entry(module_handle(), jb_module); |
|
371 |
} |
|
372 |
||
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|
373 |
// Within java.lang.Class instances there is a java.lang.reflect.Module field |
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|
374 |
// that must be set with the defining module. During startup, prior to java.base's |
207b92e69457
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parents:
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diff
changeset
|
375 |
// definition, classes needing their module field set are added to the fixup_module_list. |
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|
376 |
// Their module field is set once java.base's java.lang.reflect.Module is known to the VM. |
36508 | 377 |
void ModuleEntryTable::patch_javabase_entries(Handle module_handle) { |
378 |
if (module_handle.is_null()) { |
|
379 |
fatal("Unable to patch the module field of classes loaded prior to java.base's definition, invalid java.lang.reflect.Module"); |
|
380 |
} |
|
381 |
||
382 |
// Do the fixups for the basic primitive types |
|
383 |
java_lang_Class::set_module(Universe::int_mirror(), module_handle()); |
|
384 |
java_lang_Class::set_module(Universe::float_mirror(), module_handle()); |
|
385 |
java_lang_Class::set_module(Universe::double_mirror(), module_handle()); |
|
386 |
java_lang_Class::set_module(Universe::byte_mirror(), module_handle()); |
|
387 |
java_lang_Class::set_module(Universe::bool_mirror(), module_handle()); |
|
388 |
java_lang_Class::set_module(Universe::char_mirror(), module_handle()); |
|
389 |
java_lang_Class::set_module(Universe::long_mirror(), module_handle()); |
|
390 |
java_lang_Class::set_module(Universe::short_mirror(), module_handle()); |
|
391 |
java_lang_Class::set_module(Universe::void_mirror(), module_handle()); |
|
392 |
||
393 |
// Do the fixups for classes that have already been created. |
|
394 |
GrowableArray <Klass*>* list = java_lang_Class::fixup_module_field_list(); |
|
395 |
int list_length = list->length(); |
|
396 |
for (int i = 0; i < list_length; i++) { |
|
397 |
Klass* k = list->at(i); |
|
398 |
assert(k->is_klass(), "List should only hold classes"); |
|
41183
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lfoltan
parents:
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diff
changeset
|
399 |
java_lang_Class::fixup_module_field(KlassHandle(k), module_handle); |
38014
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diff
changeset
|
400 |
k->class_loader_data()->dec_keep_alive(); |
36508 | 401 |
} |
402 |
||
403 |
delete java_lang_Class::fixup_module_field_list(); |
|
404 |
java_lang_Class::set_fixup_module_field_list(NULL); |
|
405 |
} |
|
406 |
||
37503
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8152845: Improve PackageEntry and ModuleEntry print methods for future logging
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parents:
36508
diff
changeset
|
407 |
void ModuleEntryTable::print(outputStream* st) { |
77531df4dad3
8152845: Improve PackageEntry and ModuleEntry print methods for future logging
rprotacio
parents:
36508
diff
changeset
|
408 |
st->print_cr("Module Entry Table (table_size=%d, entries=%d)", |
77531df4dad3
8152845: Improve PackageEntry and ModuleEntry print methods for future logging
rprotacio
parents:
36508
diff
changeset
|
409 |
table_size(), number_of_entries()); |
36508 | 410 |
for (int i = 0; i < table_size(); i++) { |
411 |
for (ModuleEntry* probe = bucket(i); |
|
412 |
probe != NULL; |
|
413 |
probe = probe->next()) { |
|
37503
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parents:
36508
diff
changeset
|
414 |
probe->print(st); |
36508 | 415 |
} |
416 |
} |
|
417 |
} |
|
418 |
||
37503
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36508
diff
changeset
|
419 |
void ModuleEntry::print(outputStream* st) { |
36508 | 420 |
ResourceMark rm; |
39625
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8160356: invalid suffix on literal warning is occurred with GCC 6
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parents:
39616
diff
changeset
|
421 |
st->print_cr("entry " PTR_FORMAT " name %s module " PTR_FORMAT " loader %s version %s location %s strict %s next " PTR_FORMAT, |
37503
77531df4dad3
8152845: Improve PackageEntry and ModuleEntry print methods for future logging
rprotacio
parents:
36508
diff
changeset
|
422 |
p2i(this), |
77531df4dad3
8152845: Improve PackageEntry and ModuleEntry print methods for future logging
rprotacio
parents:
36508
diff
changeset
|
423 |
name() == NULL ? UNNAMED_MODULE : name()->as_C_string(), |
77531df4dad3
8152845: Improve PackageEntry and ModuleEntry print methods for future logging
rprotacio
parents:
36508
diff
changeset
|
424 |
p2i(module()), |
39616
f82b1f888578
8159262: Walking PackageEntry Export and ModuleEntry Reads Must Occur Only When Neccessary And Wait Until ClassLoader's Aliveness Determined
lfoltan
parents:
39290
diff
changeset
|
425 |
loader_data()->loader_name(), |
37503
77531df4dad3
8152845: Improve PackageEntry and ModuleEntry print methods for future logging
rprotacio
parents:
36508
diff
changeset
|
426 |
version() != NULL ? version()->as_C_string() : "NULL", |
77531df4dad3
8152845: Improve PackageEntry and ModuleEntry print methods for future logging
rprotacio
parents:
36508
diff
changeset
|
427 |
location() != NULL ? location()->as_C_string() : "NULL", |
77531df4dad3
8152845: Improve PackageEntry and ModuleEntry print methods for future logging
rprotacio
parents:
36508
diff
changeset
|
428 |
BOOL_TO_STR(!can_read_all_unnamed()), p2i(next())); |
36508 | 429 |
} |
430 |
||
431 |
void ModuleEntryTable::verify() { |
|
432 |
int element_count = 0; |
|
433 |
for (int i = 0; i < table_size(); i++) { |
|
434 |
for (ModuleEntry* probe = bucket(i); |
|
435 |
probe != NULL; |
|
436 |
probe = probe->next()) { |
|
437 |
probe->verify(); |
|
438 |
element_count++; |
|
439 |
} |
|
440 |
} |
|
441 |
guarantee(number_of_entries() == element_count, |
|
442 |
"Verify of Module Entry Table failed"); |
|
443 |
debug_only(verify_lookup_length((double)number_of_entries() / table_size())); |
|
444 |
} |
|
445 |
||
446 |
void ModuleEntry::verify() { |
|
39616
f82b1f888578
8159262: Walking PackageEntry Export and ModuleEntry Reads Must Occur Only When Neccessary And Wait Until ClassLoader's Aliveness Determined
lfoltan
parents:
39290
diff
changeset
|
447 |
guarantee(loader_data() != NULL, "A module entry must be associated with a loader."); |
36508 | 448 |
} |