jdk8-mips64-public/hotspot: src/share/vm/classfile/javaAssertions.cpp@8dbc025ff709 (annotated)

src/share/vm/classfile/javaAssertions.cpp@8dbc025ff709 (annotated)

src/share/vm/classfile/javaAssertions.cpp

Mon, 27 May 2013 12:58:42 +0200

author: stefank
date: Mon, 27 May 2013 12:58:42 +0200
changeset 5196: 8dbc025ff709
parent 4037: da91efe96a93
child 6876: 710a3c8b516e
permissions: -rw-r--r--

8015422: Large performance hit when the StringTable is walked twice in Parallel Scavenge
Summary: Combine the calls to StringTable::unlink and StringTable::oops_do in Parallel Scavenge.
Reviewed-by: pliden, coleenp

 /*
  * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "classfile/javaAssertions.hpp"
 #include "classfile/javaClasses.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "classfile/vmSymbols.hpp"
 #include "memory/allocation.inline.hpp"
 #include "memory/oopFactory.hpp"
 #include "oops/oop.inline.hpp"
 #include "runtime/handles.inline.hpp"
 bool                            JavaAssertions::_userDefault = false;
 bool                            JavaAssertions::_sysDefault = false;
 JavaAssertions::OptionList*     JavaAssertions::_classes = 0;
 JavaAssertions::OptionList*     JavaAssertions::_packages = 0;
 JavaAssertions::OptionList::OptionList(const char* name, bool enabled,
   OptionList* next) {
   assert(name != 0, "need a name");
   _name = name;
   _enabled = enabled;
   _next = next;
 }
 int JavaAssertions::OptionList::count(OptionList* p) {
   int rc;
   for (rc = 0; p != 0; p = p->next(), ++rc) /* empty */;
   return rc;
 }
 void JavaAssertions::addOption(const char* name, bool enable) {
   assert(name != 0, "must have a name");
   // Copy the name.  The storage needs to exist for the the lifetime of the vm;
   // it is never freed, so will be leaked (along with other option strings -
   // e.g., bootclasspath) if a process creates/destroys multiple VMs.
   int len = (int)strlen(name);
   char *name_copy = NEW_C_HEAP_ARRAY(char, len + 1, mtClass);
   strcpy(name_copy, name);
   // Figure out which list the new item should go on.  Names that end in "..."
   // go on the package tree list.
   OptionList** head = &_classes;
   if (len >= 3 && strcmp(name_copy + len - 3, "...") == 0) {
     // Delete the "...".
     len -= 3;
     name_copy[len] = '\0';
     head = &_packages;
   }
   // Convert class/package names to internal format.  Will have to convert back
   // when copying to java in createJavaAssertionStatusDirectives, but that
   // should happen only once.  Alternative would require that
   // JVM_DesiredAssertionStatus pass the external_name() to
   // JavaAssertion::enabled(), but that is done once per loaded class.
   for (int i = 0; i < len; ++i) {
     if (name_copy[i] == '.') name_copy[i] = '/';
   }
   if (TraceJavaAssertions) {
     tty->print_cr("JavaAssertions: adding %s %s=%d",
       head == &_classes ? "class" : "package",
       name_copy[0] != '\0' ? name_copy : "'default'",
       enable);
   }
   // Prepend a new item to the list.  Items added later take precedence, so
   // prepending allows us to stop searching the list after the first match.
   *head = new OptionList(name_copy, enable, *head);
 }
 oop JavaAssertions::createAssertionStatusDirectives(TRAPS) {
   Symbol* asd_sym = vmSymbols::java_lang_AssertionStatusDirectives();
   Klass* k = SystemDictionary::resolve_or_fail(asd_sym, true, CHECK_NULL);
   instanceKlassHandle asd_klass (THREAD, k);
   asd_klass->initialize(CHECK_NULL);
   Handle h = asd_klass->allocate_instance_handle(CHECK_NULL);
   int len;
   typeArrayOop t;
   len = OptionList::count(_packages);
   objArrayOop pn = oopFactory::new_objArray(SystemDictionary::String_klass(), len, CHECK_NULL);
   objArrayHandle pkgNames (THREAD, pn);
   t = oopFactory::new_typeArray(T_BOOLEAN, len, CHECK_NULL);
   typeArrayHandle pkgEnabled(THREAD, t);
   fillJavaArrays(_packages, len, pkgNames, pkgEnabled, CHECK_NULL);
   len = OptionList::count(_classes);
   objArrayOop cn = oopFactory::new_objArray(SystemDictionary::String_klass(), len, CHECK_NULL);
   objArrayHandle classNames (THREAD, cn);
   t = oopFactory::new_typeArray(T_BOOLEAN, len, CHECK_NULL);
   typeArrayHandle classEnabled(THREAD, t);
   fillJavaArrays(_classes, len, classNames, classEnabled, CHECK_NULL);
   java_lang_AssertionStatusDirectives::set_packages(h(), pkgNames());
   java_lang_AssertionStatusDirectives::set_packageEnabled(h(), pkgEnabled());
   java_lang_AssertionStatusDirectives::set_classes(h(), classNames());
   java_lang_AssertionStatusDirectives::set_classEnabled(h(), classEnabled());
   java_lang_AssertionStatusDirectives::set_deflt(h(), userClassDefault());
   return h();
 }
 void JavaAssertions::fillJavaArrays(const OptionList* p, int len,
 objArrayHandle names, typeArrayHandle enabled, TRAPS) {
   // Fill in the parallel names and enabled (boolean) arrays.  Start at the end
   // of the array and work backwards, so the order of items in the arrays
   // matches the order on the command line (the list is in reverse order, since
   // it was created by prepending successive items from the command line).
   int index;
   for (index = len - 1; p != 0; p = p->next(), --index) {
     assert(index >= 0, "length does not match list");
     Handle s = java_lang_String::create_from_str(p->name(), CHECK);
     s = java_lang_String::char_converter(s, '/', '.', CHECK);
     names->obj_at_put(index, s());
     enabled->bool_at_put(index, p->enabled());
   }
   assert(index == -1, "length does not match list");
 }
 inline JavaAssertions::OptionList*
 JavaAssertions::match_class(const char* classname) {
   for (OptionList* p = _classes; p != 0; p = p->next()) {
     if (strcmp(p->name(), classname) == 0) {
       return p;
     }
   }
   return 0;
 }
 JavaAssertions::OptionList*
 JavaAssertions::match_package(const char* classname) {
   // Search the package list for any items that apply to classname.  Each
   // sub-package in classname is checked, from most-specific to least, until one
   // is found.
   if (_packages == 0) return 0;
   // Find the length of the "most-specific" package in classname.  If classname
   // does not include a package, length will be 0 which will match items for the
   // default package (from options "-ea:..."  or "-da:...").
   size_t len = strlen(classname);
   for (/* empty */; len > 0 && classname[len] != '/'; --len) /* empty */;
   do {
     assert(len == 0 || classname[len] == '/', "not a package name");
     for (OptionList* p = _packages; p != 0; p = p->next()) {
       if (strncmp(p->name(), classname, len) == 0 && p->name()[len] == '\0') {
         return p;
       }
     }
     // Find the length of the next package, taking care to avoid decrementing
     // past 0 (len is unsigned).
     while (len > 0 && classname[--len] != '/') /* empty */;
   } while (len > 0);
   return 0;
 }
 inline void JavaAssertions::trace(const char* name,
 const char* typefound, const char* namefound, bool enabled) {
   if (TraceJavaAssertions) {
     tty->print_cr("JavaAssertions:  search for %s found %s %s=%d",
       name, typefound, namefound[0] != '\0' ? namefound : "'default'", enabled);
   }
 }
 bool JavaAssertions::enabled(const char* classname, bool systemClass) {
   assert(classname != 0, "must have a classname");
   // This will be slow if the number of assertion options on the command line is
   // large--it traverses two lists, one of them multiple times.  Could use a
   // single n-ary tree instead of lists if someone ever notices.
   // First check options that apply to classes.  If we find a match we're done.
   OptionList* p;
   if (p = match_class(classname)) {
     trace(classname, "class", p->name(), p->enabled());
     return p->enabled();
   }
   // Now check packages, from most specific to least.
   if (p = match_package(classname)) {
     trace(classname, "package", p->name(), p->enabled());
     return p->enabled();
   }
   // No match.  Return the default status.
   bool result = systemClass ? systemClassDefault() : userClassDefault();
   trace(classname, systemClass ? "system" : "user", "default", result);
   return result;
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/classfile/javaAssertions.cpp@8dbc025ff709 (annotated)

src/share/vm/classfile/javaAssertions.cpp