/*

 * Copyright (c) 2000, 2017, 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/objArrayOop.inline.hpp"

#include "oops/oop.inline.hpp"

#include "oops/typeArrayOop.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);

  InstanceKlass* asd_klass = InstanceKlass::cast(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;

}