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1 /*
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2 * Copyright 2000-2001 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // ciType
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26 //
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27 // This class represents either a class (T_OBJECT), array (T_ARRAY),
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28 // or one of the primitive types such as T_INT.
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29 class ciType : public ciObject {
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30 CI_PACKAGE_ACCESS
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31 friend class ciKlass;
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32 friend class ciReturnAddress;
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33
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34 private:
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35 BasicType _basic_type;
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36
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37 ciType(BasicType t); // for the primitive types only
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38 ciType(KlassHandle k); // for subclasses (reference types)
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39 ciType(ciKlass* klass); // for unloaded types
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40
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41 const char* type_string() { return "ciType"; }
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42
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43 void print_impl(outputStream* st);
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44
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45 // Distinguished instances of primitive ciTypes..
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46 static ciType* _basic_types[T_CONFLICT+1];
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47
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48 public:
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49 BasicType basic_type() const { return _basic_type; }
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50
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51 // Returns true iff the types are identical, or if both are klasses
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52 // and the is_subtype_of relation holds between the klasses.
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53 bool is_subtype_of(ciType* type);
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54
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55 // Get the instance of java.lang.Class corresponding to this type.
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56 // There are mirrors for instance, array, and primitive types (incl. void).
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57 virtual ciInstance* java_mirror();
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58
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59 // Get the class which "boxes" (or "wraps") values of this type.
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60 // Example: short is boxed by java.lang.Short, etc.
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61 // Returns self if it is a reference type.
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62 // Returns NULL for void, since null is used in such cases.
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63 ciKlass* box_klass();
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64
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65 // Returns true if this is not a klass or array (i.e., not a reference type).
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66 bool is_primitive_type() const { return basic_type() != T_OBJECT && basic_type() != T_ARRAY; }
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67 int size() const { return type2size[basic_type()]; }
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68 bool is_void() const { return basic_type() == T_VOID; }
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69 bool is_one_word() const { return size() == 1; }
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70 bool is_two_word() const { return size() == 2; }
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71
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72 // What kind of ciObject is this?
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73 bool is_type() { return true; }
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74 bool is_classless() const { return is_primitive_type(); }
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75
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76 virtual void print_name_on(outputStream* st);
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77 void print_name() {
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78 print_name_on(tty);
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79 }
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80
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81 static ciType* make(BasicType t);
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82 };
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83
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84
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85 // ciReturnAddress
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86 //
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87 // This class represents the type of a specific return address in the
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88 // bytecodes.
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89 class ciReturnAddress : public ciType {
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90 CI_PACKAGE_ACCESS
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91
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92 private:
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93 // The bci of this return address.
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94 int _bci;
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95
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96 ciReturnAddress(int bci);
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97
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98 const char* type_string() { return "ciReturnAddress"; }
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99
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100 void print_impl(outputStream* st);
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101
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102 public:
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103 bool is_return_address() { return true; }
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104
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105 int bci() { return _bci; }
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106
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107 static ciReturnAddress* make(int bci);
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108 };
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