ciKlass.hpp revision 5776:de6a9e811145 
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24
25#ifndef SHARE_VM_CI_CIKLASS_HPP
26#define SHARE_VM_CI_CIKLASS_HPP
27
28#include "ci/ciType.hpp"
29
30// ciKlass
31//
32// This class and its subclasses represent Klass*s in the
33// HotSpot virtual machine.  In the vm, each Klass* contains an
34// embedded Klass object.  ciKlass is subclassed to explicitly
35// represent the kind of Klass embedded in the Klass*.  For
36// example, a Klass* with an embedded ObjArrayKlass object is
37// represented in the ciObject hierarchy by the class
38// ciObjArrayKlass.
39class ciKlass : public ciType {
40  CI_PACKAGE_ACCESS
41  friend class ciEnv;
42  friend class ciField;
43  friend class ciMethod;
44  friend class ciMethodData;
45  friend class ciObjArrayKlass;
46
47private:
48  ciSymbol* _name;
49  jint _layout_helper;
50
51protected:
52  ciKlass(KlassHandle k_h, ciSymbol* name);
53  ciKlass(ciSymbol* name, BasicType bt);
54
55  Klass* get_Klass() const {
56    Klass* k = (Klass*)_metadata;
57    assert(k != NULL, "illegal use of unloaded klass");
58    return k;
59  }
60
61  // Certain subklasses have an associated class loader.
62  virtual oop loader()             { return NULL; }
63  virtual jobject loader_handle()  { return NULL; }
64
65  virtual oop protection_domain()             { return NULL; }
66  virtual jobject protection_domain_handle()  { return NULL; }
67
68  const char* type_string() { return "ciKlass"; }
69
70  void print_impl(outputStream* st);
71
72public:
73  ciKlass(KlassHandle k_h);
74
75  // What is the name of this klass?
76  ciSymbol* name() const { return _name; }
77
78  // What is its layout helper value?
79  jint layout_helper() { return _layout_helper; }
80
81  bool is_subtype_of(ciKlass* klass);
82  bool is_subclass_of(ciKlass* klass);
83  juint super_depth();
84  juint super_check_offset();
85  ciKlass* super_of_depth(juint i);
86  bool can_be_primary_super();
87  static juint primary_super_limit() { return Klass::primary_super_limit(); }
88
89  // Is this ciObject the ciInstanceKlass representing java.lang.Object()?
90  virtual bool is_java_lang_Object() const  { return false; }
91
92  // Get the shared parent of two klasses.
93  ciKlass* least_common_ancestor(ciKlass* k);
94
95  virtual bool is_interface() {
96    return false;
97  }
98
99  virtual bool is_abstract() {
100    return false;
101  }
102
103  // Does this type (array, class, interface) have no subtypes?
104  virtual bool is_leaf_type() {
105    return false;
106  }
107
108  // Attempt to get a klass using this ciKlass's loader.
109  ciKlass* find_klass(ciSymbol* klass_name);
110  // Note:  To find a class from its name string, use ciSymbol::make,
111  // but consider adding to vmSymbols.hpp instead.
112
113  // Get the instance of java.lang.Class corresponding to this klass.
114  ciInstance*            java_mirror();
115
116  // Fetch Klass::modifier_flags.
117  jint                   modifier_flags();
118
119  // Fetch Klass::access_flags.
120  jint                   access_flags();
121
122  // What kind of ciObject is this?
123  bool is_klass() const { return true; }
124
125  virtual ciKlass* exact_klass() = 0;
126
127  void print_name_on(outputStream* st);
128};
129
130#endif // SHARE_VM_CI_CIKLASS_HPP
131