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src/hotspot/share/ci/ciKlass.hpp

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  27 
  28 #include "ci/ciType.hpp"
  29 #include "oops/klass.hpp"
  30 
  31 // ciKlass
  32 //
  33 // This class and its subclasses represent Klass*s in the
  34 // HotSpot virtual machine.  In the vm, each Klass* contains an
  35 // embedded Klass object.  ciKlass is subclassed to explicitly
  36 // represent the kind of Klass embedded in the Klass*.  For
  37 // example, a Klass* with an embedded ObjArrayKlass object is
  38 // represented in the ciObject hierarchy by the class
  39 // ciObjArrayKlass.
  40 class ciKlass : public ciType {
  41   CI_PACKAGE_ACCESS
  42   friend class ciEnv;
  43   friend class ciField;
  44   friend class ciMethod;
  45   friend class ciMethodData;
  46   friend class ciObjArrayKlass;

  47   friend class ciReceiverTypeData;
  48 
  49 private:
  50   ciSymbol* _name;
  51   jint _layout_helper;
  52 
  53 protected:
  54   ciKlass(Klass* k, ciSymbol* name);
  55   ciKlass(ciSymbol* name, BasicType bt);
  56 
  57   Klass* get_Klass() const {
  58     Klass* k = (Klass*)_metadata;
  59     assert(k != NULL, "illegal use of unloaded klass");
  60     return k;
  61   }
  62 
  63   // Certain subklasses have an associated class loader.
  64   virtual oop loader()             { return NULL; }
  65   virtual jobject loader_handle()  { return NULL; }
  66 


  88   bool can_be_primary_super();
  89   static juint primary_super_limit() { return Klass::primary_super_limit(); }
  90 
  91   // Is this ciObject the ciInstanceKlass representing java.lang.Object()?
  92   virtual bool is_java_lang_Object() const  { return false; }
  93 
  94   // Get the shared parent of two klasses.
  95   ciKlass* least_common_ancestor(ciKlass* k);
  96 
  97   virtual bool is_interface() {
  98     return false;
  99   }
 100 
 101   virtual bool is_abstract() {
 102     return false;
 103   }
 104 
 105   // Does this type (array, class, interface) have no subtypes?
 106   virtual bool is_leaf_type() {
 107     return false;




 108   }
 109 
 110   // Attempt to get a klass using this ciKlass's loader.
 111   ciKlass* find_klass(ciSymbol* klass_name);
 112   // Note:  To find a class from its name string, use ciSymbol::make,
 113   // but consider adding to vmSymbols.hpp instead.
 114 
 115   // Get the instance of java.lang.Class corresponding to this klass.
 116   ciInstance*            java_mirror();
 117 
 118   // Fetch Klass::modifier_flags.
 119   jint                   modifier_flags();
 120 
 121   // Fetch Klass::access_flags.
 122   jint                   access_flags();
 123 
 124   // What kind of ciObject is this?
 125   bool is_klass() const { return true; }
 126 
 127   virtual ciKlass* exact_klass() = 0;


  27 
  28 #include "ci/ciType.hpp"
  29 #include "oops/klass.hpp"
  30 
  31 // ciKlass
  32 //
  33 // This class and its subclasses represent Klass*s in the
  34 // HotSpot virtual machine.  In the vm, each Klass* contains an
  35 // embedded Klass object.  ciKlass is subclassed to explicitly
  36 // represent the kind of Klass embedded in the Klass*.  For
  37 // example, a Klass* with an embedded ObjArrayKlass object is
  38 // represented in the ciObject hierarchy by the class
  39 // ciObjArrayKlass.
  40 class ciKlass : public ciType {
  41   CI_PACKAGE_ACCESS
  42   friend class ciEnv;
  43   friend class ciField;
  44   friend class ciMethod;
  45   friend class ciMethodData;
  46   friend class ciObjArrayKlass;
  47   friend class ciValueArrayKlass;
  48   friend class ciReceiverTypeData;
  49 
  50 private:
  51   ciSymbol* _name;
  52   jint _layout_helper;
  53 
  54 protected:
  55   ciKlass(Klass* k, ciSymbol* name);
  56   ciKlass(ciSymbol* name, BasicType bt);
  57 
  58   Klass* get_Klass() const {
  59     Klass* k = (Klass*)_metadata;
  60     assert(k != NULL, "illegal use of unloaded klass");
  61     return k;
  62   }
  63 
  64   // Certain subklasses have an associated class loader.
  65   virtual oop loader()             { return NULL; }
  66   virtual jobject loader_handle()  { return NULL; }
  67 


  89   bool can_be_primary_super();
  90   static juint primary_super_limit() { return Klass::primary_super_limit(); }
  91 
  92   // Is this ciObject the ciInstanceKlass representing java.lang.Object()?
  93   virtual bool is_java_lang_Object() const  { return false; }
  94 
  95   // Get the shared parent of two klasses.
  96   ciKlass* least_common_ancestor(ciKlass* k);
  97 
  98   virtual bool is_interface() {
  99     return false;
 100   }
 101 
 102   virtual bool is_abstract() {
 103     return false;
 104   }
 105 
 106   // Does this type (array, class, interface) have no subtypes?
 107   virtual bool is_leaf_type() {
 108     return false;
 109   }
 110 
 111   virtual bool can_be_value_array_klass() {
 112     return is_java_lang_Object();
 113   }
 114 
 115   // Attempt to get a klass using this ciKlass's loader.
 116   ciKlass* find_klass(ciSymbol* klass_name);
 117   // Note:  To find a class from its name string, use ciSymbol::make,
 118   // but consider adding to vmSymbols.hpp instead.
 119 
 120   // Get the instance of java.lang.Class corresponding to this klass.
 121   ciInstance*            java_mirror();
 122 
 123   // Fetch Klass::modifier_flags.
 124   jint                   modifier_flags();
 125 
 126   // Fetch Klass::access_flags.
 127   jint                   access_flags();
 128 
 129   // What kind of ciObject is this?
 130   bool is_klass() const { return true; }
 131 
 132   virtual ciKlass* exact_klass() = 0;
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