Mercurial > hg > truffle
annotate src/share/vm/memory/guardedMemory.cpp @ 21791:cd36556e1b78
Remove conditional makefile-based compilation of jvmci from mx_graal.py
author | Stefan Anzinger <stefan.anzinger@oracle.com> |
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date | Mon, 08 Jun 2015 14:25:25 +0200 |
parents | fa62fb12cdca |
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rev | line source |
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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 #include "precompiled.hpp" |
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25 #include "memory/allocation.hpp" |
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26 #include "memory/allocation.inline.hpp" |
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27 #include "memory/guardedMemory.hpp" |
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28 #include "runtime/os.hpp" |
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29 |
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30 void* GuardedMemory::wrap_copy(const void* ptr, const size_t len, const void* tag) { |
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31 size_t total_sz = GuardedMemory::get_total_size(len); |
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32 void* outerp = os::malloc(total_sz, mtInternal); |
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33 if (outerp != NULL) { |
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34 GuardedMemory guarded(outerp, len, tag); |
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35 void* innerp = guarded.get_user_ptr(); |
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36 memcpy(innerp, ptr, len); |
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37 return innerp; |
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38 } |
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39 return NULL; // OOM |
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40 } |
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41 |
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42 bool GuardedMemory::free_copy(void* p) { |
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43 if (p == NULL) { |
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44 return true; |
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45 } |
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46 GuardedMemory guarded((u_char*)p); |
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47 bool verify_ok = guarded.verify_guards(); |
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48 |
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49 /* always attempt to free, pass problem on to any nested memchecker */ |
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50 os::free(guarded.release_for_freeing()); |
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51 |
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52 return verify_ok; |
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53 } |
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54 |
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55 void GuardedMemory::print_on(outputStream* st) const { |
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56 if (_base_addr == NULL) { |
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57 st->print_cr("GuardedMemory(" PTR_FORMAT ") not associated to any memory", p2i(this)); |
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58 return; |
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59 } |
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60 st->print_cr("GuardedMemory(" PTR_FORMAT ") base_addr=" PTR_FORMAT |
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61 " tag=" PTR_FORMAT " user_size=" SIZE_FORMAT " user_data=" PTR_FORMAT, |
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62 p2i(this), p2i(_base_addr), p2i(get_tag()), get_user_size(), p2i(get_user_ptr())); |
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63 |
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64 Guard* guard = get_head_guard(); |
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65 st->print_cr(" Header guard @" PTR_FORMAT " is %s", p2i(guard), (guard->verify() ? "OK" : "BROKEN")); |
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66 guard = get_tail_guard(); |
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67 st->print_cr(" Trailer guard @" PTR_FORMAT " is %s", p2i(guard), (guard->verify() ? "OK" : "BROKEN")); |
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68 |
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69 u_char udata = *get_user_ptr(); |
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70 switch (udata) { |
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71 case uninitBlockPad: |
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72 st->print_cr(" User data appears unused"); |
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73 break; |
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74 case freeBlockPad: |
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75 st->print_cr(" User data appears to have been freed"); |
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76 break; |
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77 default: |
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78 st->print_cr(" User data appears to be in use"); |
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79 break; |
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80 } |
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81 } |
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82 |
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83 // test code... |
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84 |
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85 #ifndef PRODUCT |
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86 |
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87 static void guarded_memory_test_check(void* p, size_t sz, void* tag) { |
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88 assert(p != NULL, "NULL pointer given to check"); |
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89 u_char* c = (u_char*) p; |
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90 GuardedMemory guarded(c); |
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91 assert(guarded.get_tag() == tag, "Tag is not the same as supplied"); |
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92 assert(guarded.get_user_ptr() == c, "User pointer is not the same as supplied"); |
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93 assert(guarded.get_user_size() == sz, "User size is not the same as supplied"); |
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94 assert(guarded.verify_guards(), "Guard broken"); |
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95 } |
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96 |
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97 void GuardedMemory::test_guarded_memory() { |
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98 // Test the basic characteristics... |
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99 size_t total_sz = GuardedMemory::get_total_size(1); |
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100 assert(total_sz > 1 && total_sz >= (sizeof(GuardHeader) + 1 + sizeof(Guard)), "Unexpected size"); |
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101 u_char* basep = (u_char*) os::malloc(total_sz, mtInternal); |
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102 |
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103 GuardedMemory guarded(basep, 1, (void*)0xf000f000); |
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104 |
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105 assert(*basep == badResourceValue, "Expected guard in the form of badResourceValue"); |
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106 u_char* userp = guarded.get_user_ptr(); |
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107 assert(*userp == uninitBlockPad, "Expected uninitialized data in the form of uninitBlockPad"); |
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108 guarded_memory_test_check(userp, 1, (void*)0xf000f000); |
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109 |
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110 void* freep = guarded.release_for_freeing(); |
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111 assert((u_char*)freep == basep, "Expected the same pointer guard was "); |
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112 assert(*userp == freeBlockPad, "Expected user data to be free block padded"); |
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113 assert(!guarded.verify_guards(), "Expected failed"); |
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114 os::free(freep); |
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115 |
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116 // Test a number of odd sizes... |
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117 size_t sz = 0; |
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118 do { |
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119 void* p = os::malloc(GuardedMemory::get_total_size(sz), mtInternal); |
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120 void* up = guarded.wrap_with_guards(p, sz, (void*)1); |
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121 memset(up, 0, sz); |
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122 guarded_memory_test_check(up, sz, (void*)1); |
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123 os::free(guarded.release_for_freeing()); |
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124 sz = (sz << 4) + 1; |
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125 } while (sz < (256 * 1024)); |
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126 |
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127 // Test buffer overrun into head... |
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128 basep = (u_char*) os::malloc(GuardedMemory::get_total_size(1), mtInternal); |
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129 guarded.wrap_with_guards(basep, 1); |
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130 *basep = 0; |
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131 assert(!guarded.verify_guards(), "Expected failure"); |
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132 os::free(basep); |
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133 |
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134 // Test buffer overrun into tail with a number of odd sizes... |
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135 sz = 1; |
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136 do { |
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137 void* p = os::malloc(GuardedMemory::get_total_size(sz), mtInternal); |
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138 void* up = guarded.wrap_with_guards(p, sz, (void*)1); |
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139 memset(up, 0, sz + 1); // Buffer-overwrite (within guard) |
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140 assert(!guarded.verify_guards(), "Guard was not broken as expected"); |
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141 os::free(guarded.release_for_freeing()); |
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142 sz = (sz << 4) + 1; |
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143 } while (sz < (256 * 1024)); |
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144 |
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145 // Test wrap_copy/wrap_free... |
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146 assert(GuardedMemory::free_copy(NULL), "Expected free NULL to be OK"); |
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147 |
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148 const char* str = "Check my bounds out"; |
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149 size_t str_sz = strlen(str) + 1; |
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150 char* str_copy = (char*) GuardedMemory::wrap_copy(str, str_sz); |
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151 guarded_memory_test_check(str_copy, str_sz, NULL); |
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152 assert(strcmp(str, str_copy) == 0, "Not identical copy"); |
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153 assert(GuardedMemory::free_copy(str_copy), "Free copy failed to verify"); |
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154 |
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155 void* no_data = NULL; |
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156 void* no_data_copy = GuardedMemory::wrap_copy(no_data, 0); |
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157 assert(GuardedMemory::free_copy(no_data_copy), "Expected valid guards even for no data copy"); |
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158 } |
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159 |
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160 #endif // !PRODUCT |
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161 |