view src/share/vm/ci/ciKlass.hpp @ 3700:f13867c41f73

7199742: A lot of C2 OSR compilations of the same method's bci Summary: Don't clone head of OSR loop. Reviewed-by: jrose, twisti
author kvn
date Tue, 02 Oct 2012 14:49:21 -0700
parents f95d63e2154a
children d8ce2825b193
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 * published by the Free Software Foundation.
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 * 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).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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#include "ci/ciType.hpp"

// ciKlass
// This class and its subclasses represent Klass*s in the
// HotSpot virtual machine.  In the vm, each Klass* contains an
// embedded Klass object.  ciKlass is subclassed to explicitly
// represent the kind of Klass embedded in the Klass*.  For
// example, a Klass* with an embedded objArrayKlass object is
// represented in the ciObject hierarchy by the class
// ciObjArrayKlass.
class ciKlass : public ciType {
  friend class ciEnv;
  friend class ciField;
  friend class ciMethod;
  friend class ciObjArrayKlass;

  ciSymbol* _name;
  jint _layout_helper;

  ciKlass(KlassHandle k_h, ciSymbol* name);
  ciKlass(ciSymbol* name, BasicType bt);

  Klass* get_Klass() const {
    Klass* k = (Klass*)_metadata;
    assert(k != NULL, "illegal use of unloaded klass");
    return k;

  // Certain subklasses have an associated class loader.
  virtual oop loader()             { return NULL; }
  virtual jobject loader_handle()  { return NULL; }

  virtual oop protection_domain()             { return NULL; }
  virtual jobject protection_domain_handle()  { return NULL; }

  const char* type_string() { return "ciKlass"; }

  void print_impl(outputStream* st);

  ciKlass(KlassHandle k_h);

  // What is the name of this klass?
  ciSymbol* name() const { return _name; }

  // What is its layout helper value?
  jint layout_helper() { return _layout_helper; }

  bool is_subtype_of(ciKlass* klass);
  bool is_subclass_of(ciKlass* klass);
  juint super_depth();
  juint super_check_offset();
  ciKlass* super_of_depth(juint i);
  bool can_be_primary_super();
  static juint primary_super_limit() { return Klass::primary_super_limit(); }

  // Is this ciObject the ciInstanceKlass representing java.lang.Object()?
  virtual bool is_java_lang_Object() const  { return false; }

  // Get the shared parent of two klasses.
  ciKlass* least_common_ancestor(ciKlass* k);

  virtual bool is_interface() {
    return false;

  virtual bool is_abstract() {
    return false;

  // Does this type (array, class, interface) have no subtypes?
  virtual bool is_leaf_type() {
    return false;

  // Attempt to get a klass using this ciKlass's loader.
  ciKlass* find_klass(ciSymbol* klass_name);
  // Note:  To find a class from its name string, use ciSymbol::make,
  // but consider adding to vmSymbols.hpp instead.

  // Get the instance of java.lang.Class corresponding to this klass.
  ciInstance*            java_mirror();

  // Fetch Klass::modifier_flags.
  jint                   modifier_flags();

  // Fetch Klass::access_flags.
  jint                   access_flags();

  // What kind of ciObject is this?
  bool is_klass() const { return true; }

  void print_name_on(outputStream* st);