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20375
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1 /*
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2 * Copyright (c) 2014, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_CLASSFILE_SHAREDPATHSMISCINFO_HPP
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26 #define SHARE_VM_CLASSFILE_SHAREDPATHSMISCINFO_HPP
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27
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28 #include "runtime/os.hpp"
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29
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30 // During dumping time, when processing class paths, we build up the dump-time
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31 // classpath. The JAR files that exist are stored in the list ClassLoader::_first_entry.
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32 // However, we need to store other "misc" information for run-time checking, such as
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33 //
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34 // + The values of Arguments::get_sysclasspath() used during dumping.
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35 //
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36 // + The meta-index file(s) used during dumping (incl modification time and size)
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37 //
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38 // + The class path elements specified during dumping but did not exist --
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39 // these elements must also be specified at run time, and they also must not
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40 // exist at run time.
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41 //
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42 // These misc items are stored in a linear buffer in SharedPathsMiscInfo.
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43 // The storage format is stream oriented to minimize its size.
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44 //
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45 // When writing the information to the archive file, SharedPathsMiscInfo is stored in
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46 // the archive file header. At run-time, this information is used only during initialization
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47 // (accessed using read() instead of mmap()), and is deallocated afterwards to save space.
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48 //
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49 // The SharedPathsMiscInfo class is used for both creating the the information (during
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50 // dumping time) and validation (at run time). Different constructors are used in the
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51 // two situations. See below.
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52
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53 class SharedPathsMiscInfo : public CHeapObj<mtClass> {
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54 protected:
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55 char* _buf_start;
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56 char* _cur_ptr;
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57 char* _end_ptr;
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58 int _buf_size;
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59 bool _allocated; // was _buf_start allocated by me?
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60 void ensure_size(size_t needed_bytes);
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61 void add_path(const char* path, int type);
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62
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63 void write(const void* ptr, size_t size);
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64 bool read(void* ptr, size_t size);
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65
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66 static void trace_class_path(const char* msg, const char* name = NULL) {
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67 ClassLoader::trace_class_path(msg, name);
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68 }
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69 protected:
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70 static bool fail(const char* msg, const char* name = NULL);
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71 virtual bool check(jint type, const char* path);
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72
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73 public:
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74 enum {
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75 INITIAL_BUF_SIZE = 128
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76 };
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77 // This constructor is used when creating the misc information (during dump)
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78 SharedPathsMiscInfo() {
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79 _buf_size = INITIAL_BUF_SIZE;
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80 _cur_ptr = _buf_start = NEW_C_HEAP_ARRAY(char, _buf_size, mtClass);
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81 _allocated = true;
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82 }
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83 // This constructor is used when validating the misc info (during run time)
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84 SharedPathsMiscInfo(char *buff, int size) {
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85 _cur_ptr = _buf_start = buff;
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86 _end_ptr = _buf_start + size;
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87 _buf_size = size;
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88 _allocated = false;
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89 }
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90 ~SharedPathsMiscInfo() {
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91 if (_allocated) {
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92 FREE_C_HEAP_ARRAY(char, _buf_start, mtClass);
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93 }
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94 }
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95 int get_used_bytes() {
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96 return _cur_ptr - _buf_start;
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97 }
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98 void* buffer() {
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99 return _buf_start;
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100 }
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101
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102 // writing --
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103
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104 // The path must not exist at run-time
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105 void add_nonexist_path(const char* path) {
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106 add_path(path, NON_EXIST);
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107 }
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108
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109 // The path must exist and have required size and modification time
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110 void add_required_file(const char* path) {
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111 add_path(path, REQUIRED);
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112
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113 struct stat st;
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114 if (os::stat(path, &st) != 0) {
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115 assert(0, "sanity");
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116 ClassLoader::exit_with_path_failure("failed to os::stat(%s)", path); // should not happen
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117 }
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118 write_time(st.st_mtime);
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119 write_long(st.st_size);
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120 }
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121
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122 // The path must exist, and must contain exactly <num_entries> files/dirs
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123 void add_boot_classpath(const char* path) {
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124 add_path(path, BOOT);
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125 }
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126 int write_jint(jint num) {
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127 write(&num, sizeof(num));
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128 return 0;
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129 }
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130 void write_time(time_t t) {
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131 write(&t, sizeof(t));
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132 }
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133 void write_long(long l) {
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134 write(&l, sizeof(l));
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135 }
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136
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137 bool dump_to_file(int fd) {
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138 int n = get_used_bytes();
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139 return (os::write(fd, _buf_start, n) == (size_t)n);
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140 }
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141
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142 // reading --
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143
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144 enum {
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145 BOOT = 1,
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146 NON_EXIST = 2,
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147 REQUIRED = 3
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148 };
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149
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150 virtual const char* type_name(int type) {
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151 switch (type) {
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152 case BOOT: return "BOOT";
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153 case NON_EXIST: return "NON_EXIST";
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154 case REQUIRED: return "REQUIRED";
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155 default: ShouldNotReachHere(); return "?";
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156 }
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157 }
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158
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159 virtual void print_path(outputStream* out, int type, const char* path) {
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160 switch (type) {
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161 case BOOT:
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162 out->print("Expecting -Dsun.boot.class.path=%s", path);
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163 break;
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164 case NON_EXIST:
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165 out->print("Expecting that %s does not exist", path);
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166 break;
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167 case REQUIRED:
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168 out->print("Expecting that file %s must exist and is not altered", path);
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169 break;
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170 default:
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171 ShouldNotReachHere();
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172 }
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173 }
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174
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175 bool check();
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176 bool read_jint(jint *ptr) {
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177 return read(ptr, sizeof(jint));
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178 }
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179 bool read_long(long *ptr) {
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180 return read(ptr, sizeof(long));
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181 }
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182 bool read_time(time_t *ptr) {
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183 return read(ptr, sizeof(time_t));
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184 }
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185 };
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186
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187 #endif // SHARE_VM_CLASSFILE_SHAREDPATHSMISCINFO_HPP
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