jdk8-mips64-public/hotspot: src/share/vm/classfile/classFileStream.hpp@c18cbe5936b8

6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair

     1 /*

     2  * Copyright (c) 1997, 2005, 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  *

    23  */

    25 // Input stream for reading .class file

    26 //

    27 // The entire input stream is present in a buffer allocated by the caller.

    28 // The caller is responsible for deallocating the buffer and for using

    29 // ResourceMarks appropriately when constructing streams.

    31 class ClassFileStream: public ResourceObj {

    32  private:

    33   u1*   _buffer_start; // Buffer bottom

    34   u1*   _buffer_end;   // Buffer top (one past last element)

    35   u1*   _current;      // Current buffer position

    36   char* _source;       // Source of stream (directory name, ZIP/JAR archive name)

    37   bool  _need_verify;  // True if verification is on for the class file

    39   void truncated_file_error(TRAPS);

    40  public:

    41   // Constructor

    42   ClassFileStream(u1* buffer, int length, char* source);

    44   // Buffer access

    45   u1* buffer() const           { return _buffer_start; }

    46   int length() const           { return _buffer_end - _buffer_start; }

    47   u1* current() const          { return _current; }

    48   void set_current(u1* pos)    { _current = pos; }

    49   char* source() const         { return _source; }

    50   void set_verify(bool flag)   { _need_verify = flag; }

    52   void check_truncated_file(bool b, TRAPS) {

    53     if (b) {

    54       truncated_file_error(THREAD);

    55     }

    56   }

    58   void guarantee_more(int size, TRAPS) {

    59     size_t remaining = (size_t)(_buffer_end - _current);

    60     unsigned int usize = (unsigned int)size;

    61     check_truncated_file(usize > remaining, CHECK);

    62   }

    64   // Read u1 from stream

    65   u1 get_u1(TRAPS);

    66   u1 get_u1_fast() {

    67     return *_current++;

    68   }

    70   // Read u2 from stream

    71   u2 get_u2(TRAPS);

    72   u2 get_u2_fast() {

    73     u2 res = Bytes::get_Java_u2(_current);

    74     _current += 2;

    75     return res;

    76   }

    78   // Read u4 from stream

    79   u4 get_u4(TRAPS);

    80   u4 get_u4_fast() {

    81     u4 res = Bytes::get_Java_u4(_current);

    82     _current += 4;

    83     return res;

    84   }

    86   // Read u8 from stream

    87   u8 get_u8(TRAPS);

    88   u8 get_u8_fast() {

    89     u8 res = Bytes::get_Java_u8(_current);

    90     _current += 8;

    91     return res;

    92   }

    94   // Get direct pointer into stream at current position.

    95   // Returns NULL if length elements are not remaining. The caller is

    96   // responsible for calling skip below if buffer contents is used.

    97   u1* get_u1_buffer() {

    98     return _current;

    99   }

   101   u2* get_u2_buffer() {

   102     return (u2*) _current;

   103   }

   105   // Skip length u1 or u2 elements from stream

   106   void skip_u1(int length, TRAPS);

   107   void skip_u1_fast(int length) {

   108     _current += length;

   109   }

   111   void skip_u2(int length, TRAPS);

   112   void skip_u2_fast(int length) {

   113     _current += 2 * length;

   114   }

   116   // Tells whether eos is reached

   117   bool at_eos() const          { return _current == _buffer_end; }

   118 };

Mercurial > jdk8-mips64-public > hotspot / file revision