src/hotspot/share/classfile/javaAssertions.cpp
author gziemski
Tue, 14 Aug 2018 18:42:14 -0500
changeset 51405 8b23aa7cef47
parent 49036 bc92debe57e4
child 58722 cba8afa5cfed
permissions -rw-r--r--
8195100: Use a low latency hashtable for SymbolTable Summary: Used concurrentHashTable, similar to stringTable Reviewed-by: coleenp, kbarrett, iklam, pliden
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/*
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 * Copyright (c) 2000, 2017, 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/javaAssertions.hpp"
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#include "classfile/javaClasses.hpp"
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#include "classfile/systemDictionary.hpp"
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#include "classfile/vmSymbols.hpp"
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#include "memory/allocation.inline.hpp"
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#include "memory/oopFactory.hpp"
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#include "oops/objArrayOop.inline.hpp"
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#include "oops/oop.inline.hpp"
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#include "oops/typeArrayOop.inline.hpp"
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#include "runtime/handles.inline.hpp"
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bool                            JavaAssertions::_userDefault = false;
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bool                            JavaAssertions::_sysDefault = false;
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JavaAssertions::OptionList*     JavaAssertions::_classes = 0;
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JavaAssertions::OptionList*     JavaAssertions::_packages = 0;
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JavaAssertions::OptionList::OptionList(const char* name, bool enabled,
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  OptionList* next) {
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  assert(name != 0, "need a name");
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  _name = name;
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  _enabled = enabled;
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  _next = next;
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}
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int JavaAssertions::OptionList::count(OptionList* p) {
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  int rc;
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  for (rc = 0; p != 0; p = p->next(), ++rc) /* empty */;
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  return rc;
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}
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void JavaAssertions::addOption(const char* name, bool enable) {
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  assert(name != 0, "must have a name");
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  // Copy the name.  The storage needs to exist for the the lifetime of the vm;
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  // it is never freed, so will be leaked (along with other option strings -
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  // e.g., bootclasspath) if a process creates/destroys multiple VMs.
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  int len = (int)strlen(name);
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  char *name_copy = NEW_C_HEAP_ARRAY(char, len + 1, mtClass);
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  strcpy(name_copy, name);
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  // Figure out which list the new item should go on.  Names that end in "..."
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  // go on the package tree list.
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  OptionList** head = &_classes;
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  if (len >= 3 && strcmp(name_copy + len - 3, "...") == 0) {
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    // Delete the "...".
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    len -= 3;
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    name_copy[len] = '\0';
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    head = &_packages;
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  }
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  // Convert class/package names to internal format.  Will have to convert back
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  // when copying to java in createJavaAssertionStatusDirectives, but that
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  // should happen only once.  Alternative would require that
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  // JVM_DesiredAssertionStatus pass the external_name() to
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  // JavaAssertion::enabled(), but that is done once per loaded class.
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  for (int i = 0; i < len; ++i) {
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    if (name_copy[i] == '.') name_copy[i] = '/';
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  }
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  if (TraceJavaAssertions) {
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    tty->print_cr("JavaAssertions: adding %s %s=%d",
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      head == &_classes ? "class" : "package",
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      name_copy[0] != '\0' ? name_copy : "'default'",
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      enable);
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  }
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  // Prepend a new item to the list.  Items added later take precedence, so
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  // prepending allows us to stop searching the list after the first match.
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  *head = new OptionList(name_copy, enable, *head);
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}
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oop JavaAssertions::createAssertionStatusDirectives(TRAPS) {
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  Symbol* asd_sym = vmSymbols::java_lang_AssertionStatusDirectives();
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  Klass* k = SystemDictionary::resolve_or_fail(asd_sym, true, CHECK_NULL);
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  InstanceKlass* asd_klass = InstanceKlass::cast(k);
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  asd_klass->initialize(CHECK_NULL);
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  Handle h = asd_klass->allocate_instance_handle(CHECK_NULL);
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  int len;
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  typeArrayOop t;
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  len = OptionList::count(_packages);
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  objArrayOop pn = oopFactory::new_objArray(SystemDictionary::String_klass(), len, CHECK_NULL);
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  objArrayHandle pkgNames (THREAD, pn);
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  t = oopFactory::new_typeArray(T_BOOLEAN, len, CHECK_NULL);
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  typeArrayHandle pkgEnabled(THREAD, t);
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  fillJavaArrays(_packages, len, pkgNames, pkgEnabled, CHECK_NULL);
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  len = OptionList::count(_classes);
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  objArrayOop cn = oopFactory::new_objArray(SystemDictionary::String_klass(), len, CHECK_NULL);
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  objArrayHandle classNames (THREAD, cn);
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  t = oopFactory::new_typeArray(T_BOOLEAN, len, CHECK_NULL);
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  typeArrayHandle classEnabled(THREAD, t);
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  fillJavaArrays(_classes, len, classNames, classEnabled, CHECK_NULL);
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  java_lang_AssertionStatusDirectives::set_packages(h(), pkgNames());
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  java_lang_AssertionStatusDirectives::set_packageEnabled(h(), pkgEnabled());
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  java_lang_AssertionStatusDirectives::set_classes(h(), classNames());
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  java_lang_AssertionStatusDirectives::set_classEnabled(h(), classEnabled());
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  java_lang_AssertionStatusDirectives::set_deflt(h(), userClassDefault());
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  return h();
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}
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void JavaAssertions::fillJavaArrays(const OptionList* p, int len,
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objArrayHandle names, typeArrayHandle enabled, TRAPS) {
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  // Fill in the parallel names and enabled (boolean) arrays.  Start at the end
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  // of the array and work backwards, so the order of items in the arrays
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  // matches the order on the command line (the list is in reverse order, since
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  // it was created by prepending successive items from the command line).
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  int index;
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  for (index = len - 1; p != 0; p = p->next(), --index) {
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    assert(index >= 0, "length does not match list");
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    Handle s = java_lang_String::create_from_str(p->name(), CHECK);
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    s = java_lang_String::char_converter(s, '/', '.', CHECK);
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    names->obj_at_put(index, s());
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    enabled->bool_at_put(index, p->enabled());
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  }
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  assert(index == -1, "length does not match list");
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}
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inline JavaAssertions::OptionList*
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JavaAssertions::match_class(const char* classname) {
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  for (OptionList* p = _classes; p != 0; p = p->next()) {
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    if (strcmp(p->name(), classname) == 0) {
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      return p;
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    }
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  }
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  return 0;
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}
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JavaAssertions::OptionList*
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JavaAssertions::match_package(const char* classname) {
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  // Search the package list for any items that apply to classname.  Each
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  // sub-package in classname is checked, from most-specific to least, until one
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  // is found.
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  if (_packages == 0) return 0;
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  // Find the length of the "most-specific" package in classname.  If classname
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  // does not include a package, length will be 0 which will match items for the
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  // default package (from options "-ea:..."  or "-da:...").
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  size_t len = strlen(classname);
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  for (/* empty */; len > 0 && classname[len] != '/'; --len) /* empty */;
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  do {
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    assert(len == 0 || classname[len] == '/', "not a package name");
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    for (OptionList* p = _packages; p != 0; p = p->next()) {
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      if (strncmp(p->name(), classname, len) == 0 && p->name()[len] == '\0') {
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        return p;
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      }
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    }
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    // Find the length of the next package, taking care to avoid decrementing
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    // past 0 (len is unsigned).
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    while (len > 0 && classname[--len] != '/') /* empty */;
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  } while (len > 0);
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  return 0;
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}
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inline void JavaAssertions::trace(const char* name,
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const char* typefound, const char* namefound, bool enabled) {
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  if (TraceJavaAssertions) {
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    tty->print_cr("JavaAssertions:  search for %s found %s %s=%d",
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      name, typefound, namefound[0] != '\0' ? namefound : "'default'", enabled);
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  }
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}
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bool JavaAssertions::enabled(const char* classname, bool systemClass) {
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  assert(classname != 0, "must have a classname");
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  // This will be slow if the number of assertion options on the command line is
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  // large--it traverses two lists, one of them multiple times.  Could use a
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  // single n-ary tree instead of lists if someone ever notices.
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  // First check options that apply to classes.  If we find a match we're done.
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  OptionList* p;
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  if ((p = match_class(classname))) {
1
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    trace(classname, "class", p->name(), p->enabled());
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    return p->enabled();
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  }
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  // Now check packages, from most specific to least.
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  if ((p = match_package(classname))) {
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    trace(classname, "package", p->name(), p->enabled());
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    return p->enabled();
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  }
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  // No match.  Return the default status.
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  bool result = systemClass ? systemClassDefault() : userClassDefault();
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  trace(classname, systemClass ? "system" : "user", "default", result);
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  return result;
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}