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src/hotspot/share/ci/ciField.hpp

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  1 /*
  2  * Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved.
  3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  4  *
  5  * This code is free software; you can redistribute it and/or modify it
  6  * under the terms of the GNU General Public License version 2 only, as
  7  * published by the Free Software Foundation.
  8  *
  9  * This code is distributed in the hope that it will be useful, but WITHOUT
 10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 12  * version 2 for more details (a copy is included in the LICENSE file that
 13  * accompanied this code).
 14  *
 15  * You should have received a copy of the GNU General Public License version
 16  * 2 along with this work; if not, write to the Free Software Foundation,
 17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *

 27 
 28 #include "ci/ciClassList.hpp"
 29 #include "ci/ciConstant.hpp"
 30 #include "ci/ciFlags.hpp"
 31 #include "ci/ciInstance.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   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

  1 /*
  2  * Copyright (c) 1999, 2022, Oracle and/or its affiliates. All rights reserved.
  3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  4  *
  5  * This code is free software; you can redistribute it and/or modify it
  6  * under the terms of the GNU General Public License version 2 only, as
  7  * published by the Free Software Foundation.
  8  *
  9  * This code is distributed in the hope that it will be useful, but WITHOUT
 10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 12  * version 2 for more details (a copy is included in the LICENSE file that
 13  * accompanied this code).
 14  *
 15  * You should have received a copy of the GNU General Public License version
 16  * 2 along with this work; if not, write to the Free Software Foundation,
 17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *

 27 
 28 #include "ci/ciClassList.hpp"
 29 #include "ci/ciConstant.hpp"
 30 #include "ci/ciFlags.hpp"
 31 #include "ci/ciInstance.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   ciInstanceKlass* _original_holder; // For flattened fields
 48   ciSymbol*        _name;
 49   ciSymbol*        _signature;
 50   ciType*          _type;
 51   int              _offset;
 52   bool             _is_constant;
 53   bool             _is_flattened;
 54   bool             _is_null_free;
 55   ciMethod*        _known_to_link_with_put;
 56   ciInstanceKlass* _known_to_link_with_get;
 57   ciConstant       _constant_value;
 58 
 59   ciType* compute_type();
 60   ciType* compute_type_impl();
 61 
 62   ciField(ciInstanceKlass* klass, int index);
 63   ciField(fieldDescriptor* fd);
 64   ciField(ciField* field, ciInstanceKlass* holder, int offset, bool is_final);
 65 
 66   // shared constructor code
 67   void initialize_from(fieldDescriptor* fd);
 68 
 69 public:
 70   ciFlags flags() const { return _flags; }
 71 
 72   // Of which klass is this field a member?
 73   //
 74   // Usage note: the declared holder of a field is the class
 75   // referenced by name in the bytecodes.  The canonical holder
 76   // is the most general class which holds the field.  This
 77   // method returns the canonical holder.  The declared holder
 78   // can be accessed via a method in ciBytecodeStream.
 79   //
 80   // Ex.
 81   //     class A {
 82   //       public int f = 7;
 83   //     }
 84   //     class B extends A {

 89   //
 90   //   A java compiler is permitted to compile the access to
 91   //   field f as:
 92   //
 93   //     getfield B.f
 94   //
 95   //   In that case the declared holder of f would be B and
 96   //   the canonical holder of f would be A.
 97   ciInstanceKlass* holder() const { return _holder; }
 98 
 99   // Name of this field?
100   ciSymbol* name() const { return _name; }
101 
102   // Signature of this field?
103   ciSymbol* signature() const { return _signature; }
104 
105   // Of what type is this field?
106   ciType* type() { return (_type == NULL) ? compute_type() : _type; }
107 
108   // How is this field actually stored in memory?
109   BasicType layout_type() { return type2field[type()->basic_type()]; }
110 
111   // How big is this field in memory?
112   int size_in_bytes() { return type2aelembytes(layout_type()); }
113 
114   // What is the offset of this field?
115   int offset() const {
116     assert(_offset >= 1, "illegal call to offset()");
117     return _offset;
118   }
119 
120   // Same question, explicit units.  (Fields are aligned to the byte level.)
121   int offset_in_bytes() const {
122     return offset();
123   }
124 
125   // Is this field shared?
126   bool is_shared() {
127     // non-static fields of shared holders are cached
128     return _holder->is_shared() && !is_static();
129   }

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