author | mchung |
Mon, 23 Nov 2015 12:44:43 -0800 | |
changeset 34253 | ba3946143842 |
parent 26419 | 25abc4a3285c |
child 34666 | 1c7168ea0034 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_VM_CLASSFILE_CLASSFILESTREAM_HPP |
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#define SHARE_VM_CLASSFILE_CLASSFILESTREAM_HPP |
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#include "utilities/bytes.hpp" |
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#include "utilities/top.hpp" |
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// Input stream for reading .class file |
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// |
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// The entire input stream is present in a buffer allocated by the caller. |
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// The caller is responsible for deallocating the buffer and for using |
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// ResourceMarks appropriately when constructing streams. |
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class ClassFileStream: public ResourceObj { |
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private: |
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u1* _buffer_start; // Buffer bottom |
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u1* _buffer_end; // Buffer top (one past last element) |
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u1* _current; // Current buffer position |
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const char* _source; // Source of stream (directory name, ZIP/JAR archive name) |
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bool _need_verify; // True if verification is on for the class file |
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void truncated_file_error(TRAPS); |
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public: |
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// Constructor |
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ClassFileStream(u1* buffer, int length, const char* source); |
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// Buffer access |
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u1* buffer() const { return _buffer_start; } |
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int length() const { return _buffer_end - _buffer_start; } |
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u1* current() const { return _current; } |
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void set_current(u1* pos) { _current = pos; } |
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const char* source() const { return _source; } |
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void set_verify(bool flag) { _need_verify = flag; } |
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void check_truncated_file(bool b, TRAPS) { |
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if (b) { |
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truncated_file_error(THREAD); |
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} |
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} |
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void guarantee_more(int size, TRAPS) { |
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size_t remaining = (size_t)(_buffer_end - _current); |
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unsigned int usize = (unsigned int)size; |
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check_truncated_file(usize > remaining, CHECK); |
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} |
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// Read u1 from stream |
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u1 get_u1(TRAPS); |
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u1 get_u1_fast() { |
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return *_current++; |
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} |
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// Read u2 from stream |
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u2 get_u2(TRAPS); |
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u2 get_u2_fast() { |
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u2 res = Bytes::get_Java_u2(_current); |
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_current += 2; |
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return res; |
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} |
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// Read u4 from stream |
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u4 get_u4(TRAPS); |
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u4 get_u4_fast() { |
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u4 res = Bytes::get_Java_u4(_current); |
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_current += 4; |
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return res; |
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} |
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// Read u8 from stream |
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u8 get_u8(TRAPS); |
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u8 get_u8_fast() { |
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u8 res = Bytes::get_Java_u8(_current); |
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_current += 8; |
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return res; |
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} |
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// Get direct pointer into stream at current position. |
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// Returns NULL if length elements are not remaining. The caller is |
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// responsible for calling skip below if buffer contents is used. |
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u1* get_u1_buffer() { |
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return _current; |
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} |
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u2* get_u2_buffer() { |
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return (u2*) _current; |
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} |
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// Skip length u1 or u2 elements from stream |
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void skip_u1(int length, TRAPS); |
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void skip_u1_fast(int length) { |
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_current += length; |
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} |
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void skip_u2(int length, TRAPS); |
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void skip_u2_fast(int length) { |
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_current += 2 * length; |
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} |
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void skip_u4(int length, TRAPS); |
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void skip_u4_fast(int length) { |
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_current += 4 * length; |
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} |
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// Tells whether eos is reached |
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bool at_eos() const { return _current == _buffer_end; } |
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}; |
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#endif // SHARE_VM_CLASSFILE_CLASSFILESTREAM_HPP |