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hotspot/src/share/vm/ci/ciField.hpp

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+/*
+ * Copyright 1999-2006 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+// ciField
+//
+// This class represents the result of a field lookup in the VM.
+// The lookup may not succeed, in which case the information in
+// the ciField will be incomplete.
+class ciField : public ResourceObj {
+  CI_PACKAGE_ACCESS
+  friend class ciEnv;
+  friend class ciInstanceKlass;
+  friend class NonStaticFieldFiller;
+
+private:
+  ciFlags          _flags;
+  ciInstanceKlass* _holder;
+  ciSymbol*        _name;
+  ciSymbol*        _signature;
+  ciType*          _type;
+  int              _offset;
+  bool             _is_constant;
+  ciInstanceKlass* _known_to_link_with;
+  ciConstant       _constant_value;
+
+  // Used for will_link
+  int              _cp_index;
+
+  ciType* compute_type();
+  ciType* compute_type_impl();
+
+  ciField(ciInstanceKlass* klass, int index);
+  ciField(fieldDescriptor* fd);
+
+  // shared constructor code
+  void initialize_from(fieldDescriptor* fd);
+
+  // The implementation of the print method.
+  void print_impl(outputStream* st);
+
+public:
+  ciFlags flags() { return _flags; }
+
+  // Of which klass is this field a member?
+  //
+  // Usage note: the declared holder of a field is the class
+  // referenced by name in the bytecodes.  The canonical holder
+  // is the most general class which holds the field.  This
+  // method returns the canonical holder.  The declared holder
+  // can be accessed via a method in ciBytecodeStream.
+  //
+  // Ex.
+  //     class A {
+  //       public int f = 7;
+  //     }
+  //     class B extends A {
+  //       public void test() {
+  //         System.out.println(f);
+  //       }
+  //     }
+  //
+  //   A java compiler is permitted to compile the access to
+  //   field f as:
+  //
+  //     getfield B.f
+  //
+  //   In that case the declared holder of f would be B and
+  //   the canonical holder of f would be A.
+  ciInstanceKlass* holder() { return _holder; }
+
+  // Name of this field?
+  ciSymbol* name() { return _name; }
+
+  // Signature of this field?
+  ciSymbol* signature() { return _signature; }
+
+  // Of what type is this field?
+  ciType* type() { return (_type == NULL) ? compute_type() : _type; }
+
+  // How is this field actually stored in memory?
+  BasicType layout_type() { return type2field[(_type == NULL) ? T_OBJECT : _type->basic_type()]; }
+
+  // How big is this field in memory?
+  int size_in_bytes() { return type2aelembytes[layout_type()]; }
+
+  // What is the offset of this field?
+  int offset() {
+    assert(_offset >= 1, "illegal call to offset()");
+    return _offset;
+  }
+
+  // Same question, explicit units.  (Fields are aligned to the byte level.)
+  int offset_in_bytes() {
+    return offset();
+  }
+
+  // Is this field shared?
+  bool is_shared() {
+    // non-static fields of shared holders are cached
+    return _holder->is_shared() && !is_static();
+  }
+
+  // Is this field a constant?
+  //
+  // Clarification: A field is considered constant if:
+  //   1. The field is both static and final
+  //   2. The canonical holder of the field has undergone
+  //      static initialization.
+  //   3. If the field is an object or array, then the oop
+  //      in question is allocated in perm space.
+  //   4. The field is not one of the special static/final
+  //      non-constant fields.  These are java.lang.System.in
+  //      and java.lang.System.out.  Abomination.
+  //
+  // Note: the check for case 4 is not yet implemented.
+  bool is_constant() { return _is_constant; }
+
+  // Get the constant value of this field.
+  ciConstant constant_value() {
+    assert(is_constant(), "illegal call to constant_value()");
+    return _constant_value;
+  }
+
+  // Check for link time errors.  Accessing a field from a
+  // certain class via a certain bytecode may or may not be legal.
+  // This call checks to see if an exception may be raised by
+  // an access of this field.
+  //
+  // Usage note: if the same field is accessed multiple times
+  // in the same compilation, will_link will need to be checked
+  // at each point of access.
+  bool will_link(ciInstanceKlass* accessing_klass,
+                 Bytecodes::Code bc);
+
+  // Java access flags
+  bool is_public      () { return flags().is_public(); }
+  bool is_private     () { return flags().is_private(); }
+  bool is_protected   () { return flags().is_protected(); }
+  bool is_static      () { return flags().is_static(); }
+  bool is_final       () { return flags().is_final(); }
+  bool is_volatile    () { return flags().is_volatile(); }
+  bool is_transient   () { return flags().is_transient(); }
+
+  // Debugging output
+  void print();
+  void print_name_on(outputStream* st);
+};