jdk8-mips64-public/hotspot: src/share/vm/ci/ciType.hpp@5eb9169b1a14

7092712: JSR 292: unloaded invokedynamic call sites can lead to a crash with signature types not on BCP
Reviewed-by: jrose, never

     1 /*

     2  * Copyright (c) 2000, 2010, 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

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    23  */

    25 #ifndef SHARE_VM_CI_CITYPE_HPP

    26 #define SHARE_VM_CI_CITYPE_HPP

    28 #include "ci/ciObject.hpp"

    29 #include "oops/klassOop.hpp"

    31 // ciType

    32 //

    33 // This class represents either a class (T_OBJECT), array (T_ARRAY),

    34 // or one of the primitive types such as T_INT.

    35 class ciType : public ciObject {

    36   CI_PACKAGE_ACCESS

    37   friend class ciKlass;

    38   friend class ciReturnAddress;

    40 private:

    41   BasicType _basic_type;

    43   ciType(BasicType t);     // for the primitive types only

    44   ciType(KlassHandle k);   // for subclasses (reference types)

    45   ciType(ciKlass* klass);  // for unloaded types

    47   const char* type_string() { return "ciType"; }

    49   void print_impl(outputStream* st);

    51   // Distinguished instances of primitive ciTypes..

    52   static ciType* _basic_types[T_CONFLICT+1];

    54 public:

    55   BasicType basic_type() const              { return _basic_type; }

    57   // Returns true iff the types are identical, or if both are klasses

    58   // and the is_subtype_of relation holds between the klasses.

    59   bool is_subtype_of(ciType* type);

    61   // Get the instance of java.lang.Class corresponding to this type.

    62   // There are mirrors for instance, array, and primitive types (incl. void).

    63   virtual ciInstance*    java_mirror();

    65   // Get the class which "boxes" (or "wraps") values of this type.

    66   // Example:  short is boxed by java.lang.Short, etc.

    67   // Returns self if it is a reference type.

    68   // Returns NULL for void, since null is used in such cases.

    69   ciKlass*  box_klass();

    71   // Returns true if this is not a klass or array (i.e., not a reference type).

    72   bool is_primitive_type() const            { return basic_type() != T_OBJECT && basic_type() != T_ARRAY; }

    73   int size() const                          { return type2size[basic_type()]; }

    74   bool is_void() const                      { return basic_type() == T_VOID; }

    75   bool is_one_word() const                  { return size() == 1; }

    76   bool is_two_word() const                  { return size() == 2; }

    78   // What kind of ciObject is this?

    79   bool is_type()                            { return true; }

    80   bool is_classless() const                 { return is_primitive_type(); }

    82   virtual void print_name_on(outputStream* st);

    83   void print_name() {

    84     print_name_on(tty);

    85   }

    87   static ciType* make(BasicType t);

    88 };

    91 // ciReturnAddress

    92 //

    93 // This class represents the type of a specific return address in the

    94 // bytecodes.

    95 class ciReturnAddress : public ciType {

    96   CI_PACKAGE_ACCESS

    98 private:

    99   // The bci of this return address.

   100   int _bci;

   102   ciReturnAddress(int bci);

   104   const char* type_string() { return "ciReturnAddress"; }

   106   void print_impl(outputStream* st);

   108 public:

   109   bool is_return_address()  { return true; }

   111   int  bci() { return _bci; }

   113   static ciReturnAddress* make(int bci);

   114 };

   116 #endif // SHARE_VM_CI_CITYPE_HPP

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