jdk8-mips64-public/hotspot: src/share/vm/classfile/classFileStream.hpp@710a3c8b516e

     1 /*

     2  * Copyright (c) 1997, 2013, 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 /*

    26  * This file has been modified by Loongson Technology in 2015. These

    27  * modifications are Copyright (c) 2015 Loongson Technology, and are made

    28  * available on the same license terms set forth above.

    29  */

    31 #ifndef SHARE_VM_CLASSFILE_CLASSFILESTREAM_HPP

    32 #define SHARE_VM_CLASSFILE_CLASSFILESTREAM_HPP

    34 #include "utilities/top.hpp"

    35 #ifdef TARGET_ARCH_x86

    36 # include "bytes_x86.hpp"

    37 #endif

    38 #ifdef TARGET_ARCH_mips

    39 # include "bytes_mips.hpp"

    40 #endif

    41 #ifdef TARGET_ARCH_sparc

    42 # include "bytes_sparc.hpp"

    43 #endif

    44 #ifdef TARGET_ARCH_zero

    45 # include "bytes_zero.hpp"

    46 #endif

    47 #ifdef TARGET_ARCH_arm

    48 # include "bytes_arm.hpp"

    49 #endif

    50 #ifdef TARGET_ARCH_ppc

    51 # include "bytes_ppc.hpp"

    52 #endif

    54 // Input stream for reading .class file

    55 //

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

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

    58 // ResourceMarks appropriately when constructing streams.

    60 class ClassFileStream: public ResourceObj {

    61  private:

    62   u1*   _buffer_start; // Buffer bottom

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

    64   u1*   _current;      // Current buffer position

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

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

    68   void truncated_file_error(TRAPS);

    69  public:

    70   // Constructor

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

    73   // Buffer access

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

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

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

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

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

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

    81   void check_truncated_file(bool b, TRAPS) {

    82     if (b) {

    83       truncated_file_error(THREAD);

    84     }

    85   }

    87   void guarantee_more(int size, TRAPS) {

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

    89     unsigned int usize = (unsigned int)size;

    90     check_truncated_file(usize > remaining, CHECK);

    91   }

    93   // Read u1 from stream

    94   u1 get_u1(TRAPS);

    95   u1 get_u1_fast() {

    96     return *_current++;

    97   }

    99   // Read u2 from stream

   100   u2 get_u2(TRAPS);

   101   u2 get_u2_fast() {

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

   103     _current += 2;

   104     return res;

   105   }

   107   // Read u4 from stream

   108   u4 get_u4(TRAPS);

   109   u4 get_u4_fast() {

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

   111     _current += 4;

   112     return res;

   113   }

   115   // Read u8 from stream

   116   u8 get_u8(TRAPS);

   117   u8 get_u8_fast() {

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

   119     _current += 8;

   120     return res;

   121   }

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

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

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

   126   u1* get_u1_buffer() {

   127     return _current;

   128   }

   130   u2* get_u2_buffer() {

   131     return (u2*) _current;

   132   }

   134   // Skip length u1 or u2 elements from stream

   135   void skip_u1(int length, TRAPS);

   136   void skip_u1_fast(int length) {

   137     _current += length;

   138   }

   140   void skip_u2(int length, TRAPS);

   141   void skip_u2_fast(int length) {

   142     _current += 2 * length;

   143   }

   145   void skip_u4(int length, TRAPS);

   146   void skip_u4_fast(int length) {

   147     _current += 4 * length;

   148   }

   150   // Tells whether eos is reached

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

   152 };

   154 #endif // SHARE_VM_CLASSFILE_CLASSFILESTREAM_HPP

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