jdk8-mips64-public/hotspot: src/share/vm/classfile/classFileStream.cpp@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 #include "precompiled.hpp"

    26 #include "classfile/classFileStream.hpp"

    27 #include "classfile/vmSymbols.hpp"

    29 void ClassFileStream::truncated_file_error(TRAPS) {

    30   THROW_MSG(vmSymbols::java_lang_ClassFormatError(), "Truncated class file");

    31 }

    33 ClassFileStream::ClassFileStream(u1* buffer, int length, char* source) {

    34   _buffer_start = buffer;

    35   _buffer_end   = buffer + length;

    36   _current      = buffer;

    37   _source       = source;

    38   _need_verify  = false;

    39 }

    41 u1 ClassFileStream::get_u1(TRAPS) {

    42   if (_need_verify) {

    43     guarantee_more(1, CHECK_0);

    44   } else {

    45     assert(1 <= _buffer_end - _current, "buffer overflow");

    46   }

    47   return *_current++;

    48 }

    50 u2 ClassFileStream::get_u2(TRAPS) {

    51   if (_need_verify) {

    52     guarantee_more(2, CHECK_0);

    53   } else {

    54     assert(2 <= _buffer_end - _current, "buffer overflow");

    55   }

    56   u1* tmp = _current;

    57   _current += 2;

    58   return Bytes::get_Java_u2(tmp);

    59 }

    61 u4 ClassFileStream::get_u4(TRAPS) {

    62   if (_need_verify) {

    63     guarantee_more(4, CHECK_0);

    64   } else {

    65     assert(4 <= _buffer_end - _current, "buffer overflow");

    66   }

    67   u1* tmp = _current;

    68   _current += 4;

    69   return Bytes::get_Java_u4(tmp);

    70 }

    72 u8 ClassFileStream::get_u8(TRAPS) {

    73   if (_need_verify) {

    74     guarantee_more(8, CHECK_0);

    75   } else {

    76     assert(8 <= _buffer_end - _current, "buffer overflow");

    77   }

    78   u1* tmp = _current;

    79   _current += 8;

    80   return Bytes::get_Java_u8(tmp);

    81 }

    83 void ClassFileStream::skip_u1(int length, TRAPS) {

    84   if (_need_verify) {

    85     guarantee_more(length, CHECK);

    86   }

    87   _current += length;

    88 }

    90 void ClassFileStream::skip_u2(int length, TRAPS) {

    91   if (_need_verify) {

    92     guarantee_more(length * 2, CHECK);

    93   }

    94   _current += length * 2;

    95 }

    97 void ClassFileStream::skip_u4(int length, TRAPS) {

    98   if (_need_verify) {

    99     guarantee_more(length * 4, CHECK);

   100   }

   101   _current += length * 4;

   102 }

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