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src/hotspot/share/ci/ciField.hpp

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 32 #include "ci/ciUtilities.hpp"
 33 
 34 // ciField
 35 //
 36 // This class represents the result of a field lookup in the VM.
 37 // The lookup may not succeed, in which case the information in
 38 // the ciField will be incomplete.
 39 class ciField : public ResourceObj {
 40   CI_PACKAGE_ACCESS
 41   friend class ciEnv;
 42   friend class ciInstanceKlass;
 43 
 44 private:
 45   ciFlags          _flags;
 46   ciInstanceKlass* _holder;
 47   ciSymbol*        _name;
 48   ciSymbol*        _signature;
 49   ciType*          _type;
 50   int              _offset;
 51   bool             _is_constant;


 52   ciMethod*        _known_to_link_with_put;
 53   ciInstanceKlass* _known_to_link_with_get;
 54   ciConstant       _constant_value;
 55 
 56   ciType* compute_type();
 57   ciType* compute_type_impl();
 58 
 59   ciField(ciInstanceKlass* klass, int index);
 60   ciField(fieldDescriptor* fd);

 61 
 62   // shared constructor code
 63   void initialize_from(fieldDescriptor* fd);
 64 
 65 public:
 66   ciFlags flags() const { return _flags; }
 67 
 68   // Of which klass is this field a member?
 69   //
 70   // Usage note: the declared holder of a field is the class
 71   // referenced by name in the bytecodes.  The canonical holder
 72   // is the most general class which holds the field.  This
 73   // method returns the canonical holder.  The declared holder
 74   // can be accessed via a method in ciBytecodeStream.
 75   //
 76   // Ex.
 77   //     class A {
 78   //       public int f = 7;
 79   //     }
 80   //     class B extends A {

 85   //
 86   //   A java compiler is permitted to compile the access to
 87   //   field f as:
 88   //
 89   //     getfield B.f
 90   //
 91   //   In that case the declared holder of f would be B and
 92   //   the canonical holder of f would be A.
 93   ciInstanceKlass* holder() const { return _holder; }
 94 
 95   // Name of this field?
 96   ciSymbol* name() const { return _name; }
 97 
 98   // Signature of this field?
 99   ciSymbol* signature() const { return _signature; }
100 
101   // Of what type is this field?
102   ciType* type() { return (_type == NULL) ? compute_type() : _type; }
103 
104   // How is this field actually stored in memory?
105   BasicType layout_type() { return type2field[(_type == NULL) ? T_OBJECT : _type->basic_type()]; }
106 
107   // How big is this field in memory?
108   int size_in_bytes() { return type2aelembytes(layout_type()); }
109 
110   // What is the offset of this field?
111   int offset() const {
112     assert(_offset >= 1, "illegal call to offset()");
113     return _offset;
114   }
115 
116   // Same question, explicit units.  (Fields are aligned to the byte level.)
117   int offset_in_bytes() const {
118     return offset();
119   }
120 
121   // Is this field shared?
122   bool is_shared() {
123     // non-static fields of shared holders are cached
124     return _holder->is_shared() && !is_static();
125   }

157   // Check for link time errors.  Accessing a field from a
158   // certain method via a certain bytecode may or may not be legal.
159   // This call checks to see if an exception may be raised by
160   // an access of this field.
161   //
162   // Usage note: if the same field is accessed multiple times
163   // in the same compilation, will_link will need to be checked
164   // at each point of access.
165   bool will_link(ciMethod* accessing_method,
166                  Bytecodes::Code bc);
167 
168   // Java access flags
169   bool is_public               () const { return flags().is_public(); }
170   bool is_private              () const { return flags().is_private(); }
171   bool is_protected            () const { return flags().is_protected(); }
172   bool is_static               () const { return flags().is_static(); }
173   bool is_final                () const { return flags().is_final(); }
174   bool is_stable               () const { return flags().is_stable(); }
175   bool is_volatile             () const { return flags().is_volatile(); }
176   bool is_transient            () const { return flags().is_transient(); }



177   // The field is modified outside of instance initializer methods
178   // (or class/initializer methods if the field is static).
179   bool has_initialized_final_update() const { return flags().has_initialized_final_update(); }
180 
181   bool is_call_site_target();
182 
183   bool is_autobox_cache();
184 
185   // Debugging output
186   void print();
187   void print_name_on(outputStream* st);
188 };
189 
190 #endif // SHARE_CI_CIFIELD_HPP

 32 #include "ci/ciUtilities.hpp"
 33 
 34 // ciField
 35 //
 36 // This class represents the result of a field lookup in the VM.
 37 // The lookup may not succeed, in which case the information in
 38 // the ciField will be incomplete.
 39 class ciField : public ResourceObj {
 40   CI_PACKAGE_ACCESS
 41   friend class ciEnv;
 42   friend class ciInstanceKlass;
 43 
 44 private:
 45   ciFlags          _flags;
 46   ciInstanceKlass* _holder;
 47   ciSymbol*        _name;
 48   ciSymbol*        _signature;
 49   ciType*          _type;
 50   int              _offset;
 51   bool             _is_constant;
 52   bool             _is_flattened;
 53   bool             _is_null_free;
 54   ciMethod*        _known_to_link_with_put;
 55   ciInstanceKlass* _known_to_link_with_get;
 56   ciConstant       _constant_value;
 57 
 58   ciType* compute_type();
 59   ciType* compute_type_impl();
 60 
 61   ciField(ciInstanceKlass* klass, int index);
 62   ciField(fieldDescriptor* fd);
 63   ciField(ciField* field, ciInstanceKlass* holder, int offset, bool is_final);
 64 
 65   // shared constructor code
 66   void initialize_from(fieldDescriptor* fd);
 67 
 68 public:
 69   ciFlags flags() const { return _flags; }
 70 
 71   // Of which klass is this field a member?
 72   //
 73   // Usage note: the declared holder of a field is the class
 74   // referenced by name in the bytecodes.  The canonical holder
 75   // is the most general class which holds the field.  This
 76   // method returns the canonical holder.  The declared holder
 77   // can be accessed via a method in ciBytecodeStream.
 78   //
 79   // Ex.
 80   //     class A {
 81   //       public int f = 7;
 82   //     }
 83   //     class B extends A {

 88   //
 89   //   A java compiler is permitted to compile the access to
 90   //   field f as:
 91   //
 92   //     getfield B.f
 93   //
 94   //   In that case the declared holder of f would be B and
 95   //   the canonical holder of f would be A.
 96   ciInstanceKlass* holder() const { return _holder; }
 97 
 98   // Name of this field?
 99   ciSymbol* name() const { return _name; }
100 
101   // Signature of this field?
102   ciSymbol* signature() const { return _signature; }
103 
104   // Of what type is this field?
105   ciType* type() { return (_type == NULL) ? compute_type() : _type; }
106 
107   // How is this field actually stored in memory?
108   BasicType layout_type() { return type2field[type()->basic_type()]; }
109 
110   // How big is this field in memory?
111   int size_in_bytes() { return type2aelembytes(layout_type()); }
112 
113   // What is the offset of this field?
114   int offset() const {
115     assert(_offset >= 1, "illegal call to offset()");
116     return _offset;
117   }
118 
119   // Same question, explicit units.  (Fields are aligned to the byte level.)
120   int offset_in_bytes() const {
121     return offset();
122   }
123 
124   // Is this field shared?
125   bool is_shared() {
126     // non-static fields of shared holders are cached
127     return _holder->is_shared() && !is_static();
128   }

160   // Check for link time errors.  Accessing a field from a
161   // certain method via a certain bytecode may or may not be legal.
162   // This call checks to see if an exception may be raised by
163   // an access of this field.
164   //
165   // Usage note: if the same field is accessed multiple times
166   // in the same compilation, will_link will need to be checked
167   // at each point of access.
168   bool will_link(ciMethod* accessing_method,
169                  Bytecodes::Code bc);
170 
171   // Java access flags
172   bool is_public               () const { return flags().is_public(); }
173   bool is_private              () const { return flags().is_private(); }
174   bool is_protected            () const { return flags().is_protected(); }
175   bool is_static               () const { return flags().is_static(); }
176   bool is_final                () const { return flags().is_final(); }
177   bool is_stable               () const { return flags().is_stable(); }
178   bool is_volatile             () const { return flags().is_volatile(); }
179   bool is_transient            () const { return flags().is_transient(); }
180   bool is_flattened            () const { return _is_flattened; }
181   bool is_null_free            () const { return _is_null_free; }
182 
183   // The field is modified outside of instance initializer methods
184   // (or class/initializer methods if the field is static).
185   bool has_initialized_final_update() const { return flags().has_initialized_final_update(); }
186 
187   bool is_call_site_target();
188 
189   bool is_autobox_cache();
190 
191   // Debugging output
192   void print();
193   void print_name_on(outputStream* st);
194 };
195 
196 #endif // SHARE_CI_CIFIELD_HPP
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