Mon, 09 Jun 2008 11:51:19 -0400
6687581: Make CMS work with compressed oops
Summary: Make FreeChunk read markword instead of LSB in _klass pointer to indicate that it's a FreeChunk for compressed oops.
Reviewed-by: ysr, jmasa
duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 2003-2006 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | # include "incls/_precompiled.incl" |
duke@435 | 26 | # include "incls/_constMethodOop.cpp.incl" |
duke@435 | 27 | |
duke@435 | 28 | // Static initialization |
duke@435 | 29 | const u2 constMethodOopDesc::MAX_IDNUM = 0xFFFE; |
duke@435 | 30 | const u2 constMethodOopDesc::UNSET_IDNUM = 0xFFFF; |
duke@435 | 31 | |
duke@435 | 32 | // How big must this constMethodObject be? |
duke@435 | 33 | |
duke@435 | 34 | int constMethodOopDesc::object_size(int code_size, |
duke@435 | 35 | int compressed_line_number_size, |
duke@435 | 36 | int local_variable_table_length, |
duke@435 | 37 | int checked_exceptions_length) { |
duke@435 | 38 | int extra_bytes = code_size; |
duke@435 | 39 | if (compressed_line_number_size > 0) { |
duke@435 | 40 | extra_bytes += compressed_line_number_size; |
duke@435 | 41 | } |
duke@435 | 42 | if (checked_exceptions_length > 0) { |
duke@435 | 43 | extra_bytes += sizeof(u2); |
duke@435 | 44 | extra_bytes += checked_exceptions_length * sizeof(CheckedExceptionElement); |
duke@435 | 45 | } |
duke@435 | 46 | if (local_variable_table_length > 0) { |
duke@435 | 47 | extra_bytes += sizeof(u2); |
duke@435 | 48 | extra_bytes += |
duke@435 | 49 | local_variable_table_length * sizeof(LocalVariableTableElement); |
duke@435 | 50 | } |
duke@435 | 51 | int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord; |
duke@435 | 52 | return align_object_size(header_size() + extra_words); |
duke@435 | 53 | } |
duke@435 | 54 | |
duke@435 | 55 | |
duke@435 | 56 | // linenumber table - note that length is unknown until decompression, |
duke@435 | 57 | // see class CompressedLineNumberReadStream. |
duke@435 | 58 | |
duke@435 | 59 | u_char* constMethodOopDesc::compressed_linenumber_table() const { |
duke@435 | 60 | // Located immediately following the bytecodes. |
duke@435 | 61 | assert(has_linenumber_table(), "called only if table is present"); |
duke@435 | 62 | return code_end(); |
duke@435 | 63 | } |
duke@435 | 64 | |
duke@435 | 65 | u2* constMethodOopDesc::checked_exceptions_length_addr() const { |
duke@435 | 66 | // Located at the end of the constMethod. |
duke@435 | 67 | assert(has_checked_exceptions(), "called only if table is present"); |
duke@435 | 68 | return last_u2_element(); |
duke@435 | 69 | } |
duke@435 | 70 | |
duke@435 | 71 | u2* constMethodOopDesc::localvariable_table_length_addr() const { |
duke@435 | 72 | assert(has_localvariable_table(), "called only if table is present"); |
duke@435 | 73 | if (has_checked_exceptions()) { |
duke@435 | 74 | // If checked_exception present, locate immediately before them. |
duke@435 | 75 | return (u2*) checked_exceptions_start() - 1; |
duke@435 | 76 | } else { |
duke@435 | 77 | // Else, the linenumber table is at the end of the constMethod. |
duke@435 | 78 | return last_u2_element(); |
duke@435 | 79 | } |
duke@435 | 80 | } |
duke@435 | 81 | |
duke@435 | 82 | |
duke@435 | 83 | // Update the flags to indicate the presence of these optional fields. |
duke@435 | 84 | void constMethodOopDesc::set_inlined_tables_length( |
duke@435 | 85 | int checked_exceptions_len, |
duke@435 | 86 | int compressed_line_number_size, |
duke@435 | 87 | int localvariable_table_len) { |
duke@435 | 88 | // Must be done in the order below, otherwise length_addr accessors |
duke@435 | 89 | // will not work. Only set bit in header if length is positive. |
duke@435 | 90 | assert(_flags == 0, "Error"); |
duke@435 | 91 | if (compressed_line_number_size > 0) { |
duke@435 | 92 | _flags |= _has_linenumber_table; |
duke@435 | 93 | } |
duke@435 | 94 | if (checked_exceptions_len > 0) { |
duke@435 | 95 | _flags |= _has_checked_exceptions; |
duke@435 | 96 | *(checked_exceptions_length_addr()) = checked_exceptions_len; |
duke@435 | 97 | } |
duke@435 | 98 | if (localvariable_table_len > 0) { |
duke@435 | 99 | _flags |= _has_localvariable_table; |
duke@435 | 100 | *(localvariable_table_length_addr()) = localvariable_table_len; |
duke@435 | 101 | } |
duke@435 | 102 | } |
duke@435 | 103 | |
duke@435 | 104 | |
duke@435 | 105 | int constMethodOopDesc::checked_exceptions_length() const { |
duke@435 | 106 | return has_checked_exceptions() ? *(checked_exceptions_length_addr()) : 0; |
duke@435 | 107 | } |
duke@435 | 108 | |
duke@435 | 109 | |
duke@435 | 110 | CheckedExceptionElement* constMethodOopDesc::checked_exceptions_start() const { |
duke@435 | 111 | u2* addr = checked_exceptions_length_addr(); |
duke@435 | 112 | u2 length = *addr; |
duke@435 | 113 | assert(length > 0, "should only be called if table is present"); |
duke@435 | 114 | addr -= length * sizeof(CheckedExceptionElement) / sizeof(u2); |
duke@435 | 115 | return (CheckedExceptionElement*) addr; |
duke@435 | 116 | } |
duke@435 | 117 | |
duke@435 | 118 | |
duke@435 | 119 | int constMethodOopDesc::localvariable_table_length() const { |
duke@435 | 120 | return has_localvariable_table() ? *(localvariable_table_length_addr()) : 0; |
duke@435 | 121 | } |
duke@435 | 122 | |
duke@435 | 123 | |
duke@435 | 124 | LocalVariableTableElement* constMethodOopDesc::localvariable_table_start() const { |
duke@435 | 125 | u2* addr = localvariable_table_length_addr(); |
duke@435 | 126 | u2 length = *addr; |
duke@435 | 127 | assert(length > 0, "should only be called if table is present"); |
duke@435 | 128 | addr -= length * sizeof(LocalVariableTableElement) / sizeof(u2); |
duke@435 | 129 | return (LocalVariableTableElement*) addr; |
duke@435 | 130 | } |