rev 1026 : imported patch indy.compiler.inline.patch

          --- old/src/share/vm/ci/ciField.hpp
          +++ new/src/share/vm/ci/ciField.hpp

   1    1  /*
   2    2   * Copyright 1999-2008 Sun Microsystems, Inc.  All Rights Reserved.
   3    3   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4    4   *
   5    5   * This code is free software; you can redistribute it and/or modify it
   6    6   * under the terms of the GNU General Public License version 2 only, as
   7    7   * published by the Free Software Foundation.
   8    8   *
   9    9   * This code is distributed in the hope that it will be useful, but WITHOUT
  10   10   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11   11   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12   12   * version 2 for more details (a copy is included in the LICENSE file that
  13   13   * accompanied this code).
  14   14   *
  15   15   * You should have received a copy of the GNU General Public License version
  16   16   * 2 along with this work; if not, write to the Free Software Foundation,
  17   17   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18   18   *
  19   19   * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20   20   * CA 95054 USA or visit www.sun.com if you need additional information or
  21   21   * have any questions.
  22   22   *
  23   23   */
  24   24  
  25   25  // ciField
  26   26  //
  27   27  // This class represents the result of a field lookup in the VM.
  28   28  // The lookup may not succeed, in which case the information in
  29   29  // the ciField will be incomplete.
  30   30  class ciField : public ResourceObj {
  31   31    CI_PACKAGE_ACCESS
  32   32    friend class ciEnv;
  33   33    friend class ciInstanceKlass;
  34   34    friend class NonStaticFieldFiller;
  35   35  
  36   36  private:
  37   37    ciFlags          _flags;
  38   38    ciInstanceKlass* _holder;
  39   39    ciSymbol*        _name;
  40   40    ciSymbol*        _signature;
  41   41    ciType*          _type;
  42   42    int              _offset;
  43   43    bool             _is_constant;
  44   44    ciInstanceKlass* _known_to_link_with;
  45   45    ciConstant       _constant_value;
  46   46  
  47   47    // Used for will_link
  48   48    int              _cp_index;
  49   49  
  50   50    ciType* compute_type();
  51   51    ciType* compute_type_impl();
  52   52  
  53   53    ciField(ciInstanceKlass* klass, int index);
  54   54    ciField(fieldDescriptor* fd);
  55   55  
  56   56    // shared constructor code
  57   57    void initialize_from(fieldDescriptor* fd);
  58   58  
  59   59    // The implementation of the print method.
  60   60    void print_impl(outputStream* st);
  61   61  
  62   62  public:
  63   63    ciFlags flags() { return _flags; }
  64   64  
  65   65    // Of which klass is this field a member?
  66   66    //
  67   67    // Usage note: the declared holder of a field is the class
  68   68    // referenced by name in the bytecodes.  The canonical holder
  69   69    // is the most general class which holds the field.  This
  70   70    // method returns the canonical holder.  The declared holder
  71   71    // can be accessed via a method in ciBytecodeStream.
  72   72    //
  73   73    // Ex.
  74   74    //     class A {
  75   75    //       public int f = 7;
  76   76    //     }
  77   77    //     class B extends A {
  78   78    //       public void test() {
  79   79    //         System.out.println(f);
  80   80    //       }
  81   81    //     }
  82   82    //
  83   83    //   A java compiler is permitted to compile the access to
  84   84    //   field f as:
  85   85    //
  86   86    //     getfield B.f
  87   87    //
  88   88    //   In that case the declared holder of f would be B and
  89   89    //   the canonical holder of f would be A.
  90   90    ciInstanceKlass* holder() { return _holder; }
  91   91  
  92   92    // Name of this field?
  93   93    ciSymbol* name() { return _name; }
  94   94  
  95   95    // Signature of this field?
  96   96    ciSymbol* signature() { return _signature; }
  97   97  
  98   98    // Of what type is this field?
  99   99    ciType* type() { return (_type == NULL) ? compute_type() : _type; }
 100  100  
 101  101    // How is this field actually stored in memory?
 102  102    BasicType layout_type() { return type2field[(_type == NULL) ? T_OBJECT : _type->basic_type()]; }
 103  103  
 104  104    // How big is this field in memory?
 105  105    int size_in_bytes() { return type2aelembytes(layout_type()); }
 106  106  
 107  107    // What is the offset of this field?
 108  108    int offset() {
 109  109      assert(_offset >= 1, "illegal call to offset()");
 110  110      return _offset;
 111  111    }
 112  112  
 113  113    // Same question, explicit units.  (Fields are aligned to the byte level.)
 114  114    int offset_in_bytes() {
 115  115      return offset();
 116  116    }
 117  117  
 118  118    // Is this field shared?
 119  119    bool is_shared() {
 120  120      // non-static fields of shared holders are cached
 121  121      return _holder->is_shared() && !is_static();
 122  122    }
 123  123  
 124  124    // Is this field a constant?
 125  125    //
 126  126    // Clarification: A field is considered constant if:
 127  127    //   1. The field is both static and final
 128  128    //   2. The canonical holder of the field has undergone
 129  129    //      static initialization.
 130  130    //   3. If the field is an object or array, then the oop

 131  131    //      in question is allocated in perm space.
 132  132    //   4. The field is not one of the special static/final
 133  133    //      non-constant fields.  These are java.lang.System.in
 134  134    //      and java.lang.System.out.  Abomination.
 135  135    //
 136  136    // Note: the check for case 4 is not yet implemented.
 137  137    bool is_constant() { return _is_constant; }
 138  138  
 139  139    // Get the constant value of this field.
 140  140    ciConstant constant_value() {
 141      -    assert(is_constant(), "illegal call to constant_value()");
      141 +    assert(is_static() && is_constant(), "illegal call to constant_value()");
 142  142      return _constant_value;
 143  143    }
 144  144  
      145 +  // Get the constant value of non-static final field in the given
      146 +  // object.
      147 +  ciConstant constant_value_of(ciObject* object) {
      148 +    assert(!is_static() && is_constant(), "only if field is non-static constant");
      149 +    assert(object->is_instance(), "must be instance");
      150 +    return object->as_instance()->field_value(this);
      151 +  }
      152 +
 145  153    // Check for link time errors.  Accessing a field from a
 146  154    // certain class via a certain bytecode may or may not be legal.
 147  155    // This call checks to see if an exception may be raised by
 148  156    // an access of this field.
 149  157    //
 150  158    // Usage note: if the same field is accessed multiple times
 151  159    // in the same compilation, will_link will need to be checked
 152  160    // at each point of access.
 153  161    bool will_link(ciInstanceKlass* accessing_klass,
 154  162                   Bytecodes::Code bc);

 155  163  
 156  164    // Java access flags
 157  165    bool is_public      () { return flags().is_public(); }
 158  166    bool is_private     () { return flags().is_private(); }
 159  167    bool is_protected   () { return flags().is_protected(); }
 160  168    bool is_static      () { return flags().is_static(); }
 161  169    bool is_final       () { return flags().is_final(); }
 162  170    bool is_volatile    () { return flags().is_volatile(); }
 163  171    bool is_transient   () { return flags().is_transient(); }
 164  172  
 165  173    // Debugging output
 166  174    void print();
 167  175    void print_name_on(outputStream* st);
 168  176  };

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