8006fe8f75
Replaced MakeDeps and the includeDB files with more standardized solutions. Reviewed-by: coleenp, kvn, kamg
128 lines
4.7 KiB
C++
128 lines
4.7 KiB
C++
/*
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* Copyright (c) 1997, 2010, 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_CODE_COMPRESSEDSTREAM_HPP
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#define SHARE_VM_CODE_COMPRESSEDSTREAM_HPP
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#include "memory/allocation.hpp"
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// Simple interface for filing out and filing in basic types
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// Used for writing out and reading in debugging information.
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class CompressedStream : public ResourceObj {
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friend class VMStructs;
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protected:
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u_char* _buffer;
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int _position;
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enum {
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// Constants for UNSIGNED5 coding of Pack200
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lg_H = 6, H = 1<<lg_H, // number of high codes (64)
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L = (1<<BitsPerByte)-H, // number of low codes (192)
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MAX_i = 4 // bytes are numbered in (0..4), max 5 bytes
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};
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// these inlines are defined only in compressedStream.cpp
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static inline juint encode_sign(jint value); // for Pack200 SIGNED5
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static inline jint decode_sign(juint value); // for Pack200 SIGNED5
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static inline juint reverse_int(juint bits); // to trim trailing float 0's
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public:
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CompressedStream(u_char* buffer, int position = 0) {
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_buffer = buffer;
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_position = position;
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}
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u_char* buffer() const { return _buffer; }
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// Positioning
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int position() const { return _position; }
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void set_position(int position) { _position = position; }
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};
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class CompressedReadStream : public CompressedStream {
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private:
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inline u_char read() { return _buffer[_position++]; }
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jint read_int_mb(jint b0); // UNSIGNED5 coding, 2-5 byte cases
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public:
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CompressedReadStream(u_char* buffer, int position = 0)
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: CompressedStream(buffer, position) {}
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jboolean read_bool() { return (jboolean) read(); }
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jbyte read_byte() { return (jbyte ) read(); }
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jchar read_char() { return (jchar ) read_int(); }
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jshort read_short() { return (jshort ) read_signed_int(); }
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jint read_int() { jint b0 = read();
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if (b0 < L) return b0;
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else return read_int_mb(b0);
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}
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jint read_signed_int();
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jfloat read_float(); // jfloat_cast(reverse_int(read_int()))
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jdouble read_double(); // jdouble_cast(2*reverse_int(read_int))
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jlong read_long(); // jlong_from(2*read_signed_int())
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};
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class CompressedWriteStream : public CompressedStream {
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private:
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bool full() {
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return _position >= _size;
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}
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void store(u_char b) {
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_buffer[_position++] = b;
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}
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void write(u_char b) {
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if (full()) grow();
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store(b);
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}
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void grow();
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void write_int_mb(jint value); // UNSIGNED5 coding, 1-5 byte cases
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protected:
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int _size;
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public:
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CompressedWriteStream(int initial_size);
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CompressedWriteStream(u_char* buffer, int initial_size, int position = 0)
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: CompressedStream(buffer, position) { _size = initial_size; }
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void write_bool(jboolean value) { write(value); }
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void write_byte(jbyte value) { write(value); }
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void write_char(jchar value) { write_int(value); }
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void write_short(jshort value) { write_signed_int(value); }
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void write_int(jint value) { if ((juint)value < L && !full())
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store((u_char)value);
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else write_int_mb(value); }
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void write_signed_int(jint value); // write_int(encode_sign(value))
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void write_float(jfloat value); // write_int(reverse_int(jint_cast(v)))
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void write_double(jdouble value); // write_int(reverse_int(<low,high>))
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void write_long(jlong value); // write_signed_int(<low,high>)
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};
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#endif // SHARE_VM_CODE_COMPRESSEDSTREAM_HPP
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