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