ciKlass.hpp revision 3602:da91efe96a93 
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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 ciObjArrayKlass;
45
46private:
47  ciSymbol* _name;
48  jint _layout_helper;
49
50protected:
51  ciKlass(KlassHandle k_h, ciSymbol* name);
52  ciKlass(ciSymbol* name, BasicType bt);
53
54  Klass* get_Klass() const {
55    Klass* k = (Klass*)_metadata;
56    assert(k != NULL, "illegal use of unloaded klass");
57    return k;
58  }
59
60  // Certain subklasses have an associated class loader.
61  virtual oop loader()             { return NULL; }
62  virtual jobject loader_handle()  { return NULL; }
63
64  virtual oop protection_domain()             { return NULL; }
65  virtual jobject protection_domain_handle()  { return NULL; }
66
67  const char* type_string() { return "ciKlass"; }
68
69  void print_impl(outputStream* st);
70
71public:
72  ciKlass(KlassHandle k_h);
73
74  // What is the name of this klass?
75  ciSymbol* name() const { return _name; }
76
77  // What is its layout helper value?
78  jint layout_helper() { return _layout_helper; }
79
80  bool is_subtype_of(ciKlass* klass);
81  bool is_subclass_of(ciKlass* klass);
82  juint super_depth();
83  juint super_check_offset();
84  ciKlass* super_of_depth(juint i);
85  bool can_be_primary_super();
86  static juint primary_super_limit() { return Klass::primary_super_limit(); }
87
88  // Is this ciObject the ciInstanceKlass representing java.lang.Object()?
89  virtual bool is_java_lang_Object() const  { return false; }
90
91  // Get the shared parent of two klasses.
92  ciKlass* least_common_ancestor(ciKlass* k);
93
94  virtual bool is_interface() {
95    return false;
96  }
97
98  virtual bool is_abstract() {
99    return false;
100  }
101
102  // Does this type (array, class, interface) have no subtypes?
103  virtual bool is_leaf_type() {
104    return false;
105  }
106
107  // Attempt to get a klass using this ciKlass's loader.
108  ciKlass* find_klass(ciSymbol* klass_name);
109  // Note:  To find a class from its name string, use ciSymbol::make,
110  // but consider adding to vmSymbols.hpp instead.
111
112  // Get the instance of java.lang.Class corresponding to this klass.
113  ciInstance*            java_mirror();
114
115  // Fetch Klass::modifier_flags.
116  jint                   modifier_flags();
117
118  // Fetch Klass::access_flags.
119  jint                   access_flags();
120
121  // What kind of ciObject is this?
122  bool is_klass() const { return true; }
123
124  void print_name_on(outputStream* st);
125};
126
127#endif // SHARE_VM_CI_CIKLASS_HPP
128