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hotspot/src/share/vm/classfile/javaAssertions.cpp

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+/*
+ * Copyright 2000-2005 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+#include "incls/_precompiled.incl"
+#include "incls/_javaAssertions.cpp.incl"
+
+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);
+  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) {
+  symbolHandle asd_sym = vmSymbolHandles::java_lang_AssertionStatusDirectives();
+  klassOop 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;
+}