Mercurial > hg > truffle
annotate src/share/vm/code/compressedStream.hpp @ 1721:413ad0331a0c
6977924: Changes for 6975078 produce build error with certain gcc versions
Summary: The changes introduced for 6975078 assign badHeapOopVal to the _allocation field in the ResourceObj class. In 32 bit linux builds with certain versions of gcc this assignment will be flagged as an error while compiling allocation.cpp. In 32 bit builds the constant value badHeapOopVal (which is cast to an intptr_t) is negative. The _allocation field is typed as an unsigned intptr_t and gcc catches this as an error.
Reviewed-by: jcoomes, ysr, phh
| author | johnc |
|---|---|
| date | Wed, 18 Aug 2010 10:59:06 -0700 |
| parents | c18cbe5936b8 |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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2 * Copyright (c) 1997, 2005, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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6941466: Oracle rebranding changes for Hotspot repositories
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 // Simple interface for filing out and filing in basic types | |
| 26 // Used for writing out and reading in debugging information. | |
| 27 | |
| 28 class CompressedStream : public ResourceObj { | |
| 29 friend class VMStructs; | |
| 30 protected: | |
| 31 u_char* _buffer; | |
| 32 int _position; | |
| 33 | |
| 34 enum { | |
| 35 // Constants for UNSIGNED5 coding of Pack200 | |
| 36 lg_H = 6, H = 1<<lg_H, // number of high codes (64) | |
| 37 L = (1<<BitsPerByte)-H, // number of low codes (192) | |
| 38 MAX_i = 4 // bytes are numbered in (0..4), max 5 bytes | |
| 39 }; | |
| 40 | |
| 41 // these inlines are defined only in compressedStream.cpp | |
| 42 static inline juint encode_sign(jint value); // for Pack200 SIGNED5 | |
| 43 static inline jint decode_sign(juint value); // for Pack200 SIGNED5 | |
| 44 static inline juint reverse_int(juint bits); // to trim trailing float 0's | |
| 45 | |
| 46 public: | |
| 47 CompressedStream(u_char* buffer, int position = 0) { | |
| 48 _buffer = buffer; | |
| 49 _position = position; | |
| 50 } | |
| 51 | |
| 52 u_char* buffer() const { return _buffer; } | |
| 53 | |
| 54 // Positioning | |
| 55 int position() const { return _position; } | |
| 56 void set_position(int position) { _position = position; } | |
| 57 }; | |
| 58 | |
| 59 | |
| 60 class CompressedReadStream : public CompressedStream { | |
| 61 private: | |
| 62 inline u_char read() { return _buffer[_position++]; } | |
| 63 | |
| 64 jint read_int_mb(jint b0); // UNSIGNED5 coding, 2-5 byte cases | |
| 65 | |
| 66 public: | |
| 67 CompressedReadStream(u_char* buffer, int position = 0) | |
| 68 : CompressedStream(buffer, position) {} | |
| 69 | |
| 70 jboolean read_bool() { return (jboolean) read(); } | |
| 71 jbyte read_byte() { return (jbyte ) read(); } | |
| 72 jchar read_char() { return (jchar ) read_int(); } | |
| 73 jshort read_short() { return (jshort ) read_signed_int(); } | |
| 74 jint read_int() { jint b0 = read(); | |
| 75 if (b0 < L) return b0; | |
| 76 else return read_int_mb(b0); | |
| 77 } | |
| 78 jint read_signed_int(); | |
| 79 jfloat read_float(); // jfloat_cast(reverse_int(read_int())) | |
| 80 jdouble read_double(); // jdouble_cast(2*reverse_int(read_int)) | |
| 81 jlong read_long(); // jlong_from(2*read_signed_int()) | |
| 82 }; | |
| 83 | |
| 84 | |
| 85 class CompressedWriteStream : public CompressedStream { | |
| 86 private: | |
| 87 bool full() { | |
| 88 return _position >= _size; | |
| 89 } | |
| 90 void store(u_char b) { | |
| 91 _buffer[_position++] = b; | |
| 92 } | |
| 93 void write(u_char b) { | |
| 94 if (full()) grow(); | |
| 95 store(b); | |
| 96 } | |
| 97 void grow(); | |
| 98 | |
| 99 void write_int_mb(jint value); // UNSIGNED5 coding, 1-5 byte cases | |
| 100 | |
| 101 protected: | |
| 102 int _size; | |
| 103 | |
| 104 public: | |
| 105 CompressedWriteStream(int initial_size); | |
| 106 CompressedWriteStream(u_char* buffer, int initial_size, int position = 0) | |
| 107 : CompressedStream(buffer, position) { _size = initial_size; } | |
| 108 | |
| 109 void write_bool(jboolean value) { write(value); } | |
| 110 void write_byte(jbyte value) { write(value); } | |
| 111 void write_char(jchar value) { write_int(value); } | |
| 112 void write_short(jshort value) { write_signed_int(value); } | |
| 113 void write_int(jint value) { if ((juint)value < L && !full()) | |
| 114 store((u_char)value); | |
| 115 else write_int_mb(value); } | |
| 116 void write_signed_int(jint value); // write_int(encode_sign(value)) | |
| 117 void write_float(jfloat value); // write_int(reverse_int(jint_cast(v))) | |
| 118 void write_double(jdouble value); // write_int(reverse_int(<low,high>)) | |
| 119 void write_long(jlong value); // write_signed_int(<low,high>) | |
| 120 }; |