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1 /* |
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2 * Copyright (c) 2003, 2016, 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 #include "precompiled.hpp" |
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26 #include "jvmtifiles/jvmtiEnv.hpp" |
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27 #include "logging/log.hpp" |
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28 #include "prims/jvmtiExport.hpp" |
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29 #include "prims/jvmtiManageCapabilities.hpp" |
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30 |
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31 static const jint CAPA_SIZE = (JVMTI_INTERNAL_CAPABILITY_COUNT + 7) / 8; |
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32 |
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33 // capabilities which are always potentially available |
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34 jvmtiCapabilities JvmtiManageCapabilities::always_capabilities; |
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35 |
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36 // capabilities which are potentially available during OnLoad |
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37 jvmtiCapabilities JvmtiManageCapabilities::onload_capabilities; |
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38 |
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39 // capabilities which are always potentially available |
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40 // but to only one environment |
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41 jvmtiCapabilities JvmtiManageCapabilities::always_solo_capabilities; |
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42 |
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43 // capabilities which are potentially available during OnLoad |
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44 // but to only one environment |
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45 jvmtiCapabilities JvmtiManageCapabilities::onload_solo_capabilities; |
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46 |
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47 // remaining capabilities which are always potentially available |
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48 // but to only one environment |
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49 jvmtiCapabilities JvmtiManageCapabilities::always_solo_remaining_capabilities; |
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50 |
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51 // remaining capabilities which are potentially available during OnLoad |
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52 // but to only one environment |
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53 jvmtiCapabilities JvmtiManageCapabilities::onload_solo_remaining_capabilities; |
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54 |
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55 // all capabilities ever acquired |
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56 jvmtiCapabilities JvmtiManageCapabilities::acquired_capabilities; |
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57 |
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58 void JvmtiManageCapabilities::initialize() { |
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59 always_capabilities = init_always_capabilities(); |
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60 if (JvmtiEnv::get_phase() != JVMTI_PHASE_ONLOAD) { |
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61 recompute_always_capabilities(); |
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62 } |
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63 onload_capabilities = init_onload_capabilities(); |
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64 always_solo_capabilities = init_always_solo_capabilities(); |
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65 onload_solo_capabilities = init_onload_solo_capabilities(); |
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66 always_solo_remaining_capabilities = init_always_solo_capabilities(); |
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67 onload_solo_remaining_capabilities = init_onload_solo_capabilities(); |
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68 memset(&acquired_capabilities, 0, sizeof(acquired_capabilities)); |
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69 } |
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70 |
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71 // if the capability sets are initialized in the onload phase then |
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72 // it happens before class data sharing (CDS) is initialized. If it |
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73 // turns out that CDS gets disabled then we must adjust the always |
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74 // capabilities. To ensure a consistent view of the capabililties |
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75 // anything we add here should already be in the onload set. |
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76 void JvmtiManageCapabilities::recompute_always_capabilities() { |
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77 if (!UseSharedSpaces) { |
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78 jvmtiCapabilities jc = always_capabilities; |
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79 jc.can_generate_all_class_hook_events = 1; |
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80 always_capabilities = jc; |
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81 } |
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82 } |
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83 |
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84 |
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85 // corresponding init functions |
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86 jvmtiCapabilities JvmtiManageCapabilities::init_always_capabilities() { |
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87 jvmtiCapabilities jc; |
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88 |
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89 memset(&jc, 0, sizeof(jc)); |
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90 jc.can_get_bytecodes = 1; |
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91 jc.can_signal_thread = 1; |
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92 jc.can_get_source_file_name = 1; |
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93 jc.can_get_line_numbers = 1; |
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94 jc.can_get_synthetic_attribute = 1; |
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95 jc.can_get_monitor_info = 1; |
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96 jc.can_get_constant_pool = 1; |
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97 jc.can_generate_monitor_events = 1; |
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98 jc.can_generate_garbage_collection_events = 1; |
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99 jc.can_generate_compiled_method_load_events = 1; |
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100 jc.can_generate_native_method_bind_events = 1; |
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101 jc.can_generate_vm_object_alloc_events = 1; |
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102 if (os::is_thread_cpu_time_supported()) { |
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103 jc.can_get_current_thread_cpu_time = 1; |
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104 jc.can_get_thread_cpu_time = 1; |
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105 } |
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106 jc.can_redefine_classes = 1; |
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107 jc.can_redefine_any_class = 1; |
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108 jc.can_retransform_classes = 1; |
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109 jc.can_retransform_any_class = 1; |
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110 jc.can_set_native_method_prefix = 1; |
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111 jc.can_tag_objects = 1; |
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112 jc.can_generate_object_free_events = 1; |
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113 jc.can_generate_resource_exhaustion_heap_events = 1; |
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114 jc.can_generate_resource_exhaustion_threads_events = 1; |
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115 return jc; |
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116 } |
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117 |
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118 jvmtiCapabilities JvmtiManageCapabilities::init_onload_capabilities() { |
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119 jvmtiCapabilities jc; |
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120 |
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121 memset(&jc, 0, sizeof(jc)); |
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122 #ifndef ZERO |
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123 jc.can_pop_frame = 1; |
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124 jc.can_force_early_return = 1; |
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125 #endif // !ZERO |
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126 jc.can_get_source_debug_extension = 1; |
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127 jc.can_access_local_variables = 1; |
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128 jc.can_maintain_original_method_order = 1; |
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129 jc.can_generate_all_class_hook_events = 1; |
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130 jc.can_generate_single_step_events = 1; |
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131 jc.can_generate_exception_events = 1; |
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132 jc.can_generate_frame_pop_events = 1; |
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133 jc.can_generate_method_entry_events = 1; |
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134 jc.can_generate_method_exit_events = 1; |
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135 jc.can_get_owned_monitor_info = 1; |
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136 jc.can_get_owned_monitor_stack_depth_info = 1; |
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137 jc.can_get_current_contended_monitor = 1; |
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138 jc.can_generate_early_vmstart = 1; |
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139 jc.can_generate_early_class_hook_events = 1; |
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140 return jc; |
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141 } |
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142 |
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143 |
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144 jvmtiCapabilities JvmtiManageCapabilities::init_always_solo_capabilities() { |
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145 jvmtiCapabilities jc; |
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146 |
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147 memset(&jc, 0, sizeof(jc)); |
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148 jc.can_suspend = 1; |
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149 return jc; |
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150 } |
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151 |
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152 |
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153 jvmtiCapabilities JvmtiManageCapabilities::init_onload_solo_capabilities() { |
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154 jvmtiCapabilities jc; |
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155 |
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156 memset(&jc, 0, sizeof(jc)); |
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157 jc.can_generate_field_modification_events = 1; |
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158 jc.can_generate_field_access_events = 1; |
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159 jc.can_generate_breakpoint_events = 1; |
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160 return jc; |
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161 } |
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162 |
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163 |
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164 jvmtiCapabilities *JvmtiManageCapabilities::either(const jvmtiCapabilities *a, const jvmtiCapabilities *b, |
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165 jvmtiCapabilities *result) { |
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166 char *ap = (char *)a; |
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167 char *bp = (char *)b; |
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168 char *resultp = (char *)result; |
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169 |
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170 for (int i = 0; i < CAPA_SIZE; ++i) { |
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171 *resultp++ = *ap++ | *bp++; |
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172 } |
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173 |
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174 return result; |
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175 } |
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176 |
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177 |
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178 jvmtiCapabilities *JvmtiManageCapabilities::both(const jvmtiCapabilities *a, const jvmtiCapabilities *b, |
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179 jvmtiCapabilities *result) { |
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180 char *ap = (char *)a; |
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181 char *bp = (char *)b; |
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182 char *resultp = (char *)result; |
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183 |
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184 for (int i = 0; i < CAPA_SIZE; ++i) { |
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185 *resultp++ = *ap++ & *bp++; |
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186 } |
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187 |
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188 return result; |
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189 } |
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190 |
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191 |
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192 jvmtiCapabilities *JvmtiManageCapabilities::exclude(const jvmtiCapabilities *a, const jvmtiCapabilities *b, |
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193 jvmtiCapabilities *result) { |
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194 char *ap = (char *)a; |
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195 char *bp = (char *)b; |
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196 char *resultp = (char *)result; |
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197 |
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198 for (int i = 0; i < CAPA_SIZE; ++i) { |
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199 *resultp++ = *ap++ & ~*bp++; |
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200 } |
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201 |
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202 return result; |
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203 } |
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204 |
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205 |
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206 bool JvmtiManageCapabilities::has_some(const jvmtiCapabilities *a) { |
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207 char *ap = (char *)a; |
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208 |
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209 for (int i = 0; i < CAPA_SIZE; ++i) { |
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210 if (*ap++ != 0) { |
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211 return true; |
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212 } |
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213 } |
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214 |
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215 return false; |
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216 } |
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217 |
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218 |
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219 void JvmtiManageCapabilities::copy_capabilities(const jvmtiCapabilities *from, jvmtiCapabilities *to) { |
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220 char *ap = (char *)from; |
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221 char *resultp = (char *)to; |
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222 |
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223 for (int i = 0; i < CAPA_SIZE; ++i) { |
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224 *resultp++ = *ap++; |
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225 } |
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226 } |
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227 |
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228 |
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229 void JvmtiManageCapabilities::get_potential_capabilities(const jvmtiCapabilities *current, |
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230 const jvmtiCapabilities *prohibited, |
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231 jvmtiCapabilities *result) { |
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232 // exclude prohibited capabilities, must be before adding current |
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233 exclude(&always_capabilities, prohibited, result); |
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234 |
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235 // must include current since it may possess solo capabilities and now prohibited |
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236 either(result, current, result); |
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237 |
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238 // add other remaining |
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239 either(result, &always_solo_remaining_capabilities, result); |
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240 |
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241 // if this is during OnLoad more capabilities are available |
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242 if (JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) { |
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243 either(result, &onload_capabilities, result); |
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244 either(result, &onload_solo_remaining_capabilities, result); |
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245 } |
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246 } |
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247 |
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248 jvmtiError JvmtiManageCapabilities::add_capabilities(const jvmtiCapabilities *current, |
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249 const jvmtiCapabilities *prohibited, |
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250 const jvmtiCapabilities *desired, |
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251 jvmtiCapabilities *result) { |
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252 // check that the capabilities being added are potential capabilities |
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253 jvmtiCapabilities temp; |
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254 get_potential_capabilities(current, prohibited, &temp); |
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255 if (has_some(exclude(desired, &temp, &temp))) { |
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256 return JVMTI_ERROR_NOT_AVAILABLE; |
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257 } |
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258 |
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259 // add to the set of ever acquired capabilities |
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260 either(&acquired_capabilities, desired, &acquired_capabilities); |
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261 |
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262 // onload capabilities that got added are now permanent - so, also remove from onload |
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263 both(&onload_capabilities, desired, &temp); |
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264 either(&always_capabilities, &temp, &always_capabilities); |
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265 exclude(&onload_capabilities, &temp, &onload_capabilities); |
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266 |
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267 // same for solo capabilities (transferred capabilities in the remaining sets handled as part of standard grab - below) |
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268 both(&onload_solo_capabilities, desired, &temp); |
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269 either(&always_solo_capabilities, &temp, &always_solo_capabilities); |
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270 exclude(&onload_solo_capabilities, &temp, &onload_solo_capabilities); |
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271 |
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272 // remove solo capabilities that are now taken |
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273 exclude(&always_solo_remaining_capabilities, desired, &always_solo_remaining_capabilities); |
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274 exclude(&onload_solo_remaining_capabilities, desired, &onload_solo_remaining_capabilities); |
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275 |
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276 // return the result |
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277 either(current, desired, result); |
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278 |
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279 update(); |
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280 |
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281 return JVMTI_ERROR_NONE; |
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282 } |
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283 |
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284 |
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285 void JvmtiManageCapabilities::relinquish_capabilities(const jvmtiCapabilities *current, |
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286 const jvmtiCapabilities *unwanted, |
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287 jvmtiCapabilities *result) { |
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288 jvmtiCapabilities to_trash; |
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289 jvmtiCapabilities temp; |
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290 |
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291 // can't give up what you don't have |
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292 both(current, unwanted, &to_trash); |
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293 |
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294 // restore solo capabilities but only those that belong |
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295 either(&always_solo_remaining_capabilities, both(&always_solo_capabilities, &to_trash, &temp), |
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296 &always_solo_remaining_capabilities); |
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297 either(&onload_solo_remaining_capabilities, both(&onload_solo_capabilities, &to_trash, &temp), |
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298 &onload_solo_remaining_capabilities); |
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299 |
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300 update(); |
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301 |
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302 // return the result |
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303 exclude(current, unwanted, result); |
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304 } |
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305 |
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306 |
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307 void JvmtiManageCapabilities::update() { |
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308 jvmtiCapabilities avail; |
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309 |
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310 // all capabilities |
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311 either(&always_capabilities, &always_solo_capabilities, &avail); |
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312 |
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313 bool interp_events = |
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314 avail.can_generate_field_access_events || |
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315 avail.can_generate_field_modification_events || |
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316 avail.can_generate_single_step_events || |
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317 avail.can_generate_frame_pop_events || |
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318 avail.can_generate_method_entry_events || |
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319 avail.can_generate_method_exit_events; |
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320 #ifdef ZERO |
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321 bool enter_all_methods = |
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322 interp_events || |
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323 avail.can_generate_breakpoint_events; |
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324 if (enter_all_methods) { |
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325 // Disable these when tracking the bytecodes |
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326 UseFastEmptyMethods = false; |
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327 UseFastAccessorMethods = false; |
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328 } |
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329 #endif // ZERO |
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330 |
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331 if (avail.can_generate_breakpoint_events) { |
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332 RewriteFrequentPairs = false; |
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333 } |
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334 |
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335 // If can_redefine_classes is enabled in the onload phase then we know that the |
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336 // dependency information recorded by the compiler is complete. |
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337 if ((avail.can_redefine_classes || avail.can_retransform_classes) && |
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338 JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) { |
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339 JvmtiExport::set_all_dependencies_are_recorded(true); |
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340 } |
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341 |
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342 JvmtiExport::set_can_get_source_debug_extension(avail.can_get_source_debug_extension); |
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343 JvmtiExport::set_can_maintain_original_method_order(avail.can_maintain_original_method_order); |
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344 JvmtiExport::set_can_post_interpreter_events(interp_events); |
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345 JvmtiExport::set_can_hotswap_or_post_breakpoint( |
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346 avail.can_generate_breakpoint_events || |
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347 avail.can_redefine_classes || |
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348 avail.can_retransform_classes); |
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349 JvmtiExport::set_can_modify_any_class( |
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350 avail.can_generate_breakpoint_events || |
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351 avail.can_generate_all_class_hook_events); |
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352 JvmtiExport::set_can_walk_any_space( |
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353 avail.can_tag_objects); // disable sharing in onload phase |
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354 // This controls whether the compilers keep extra locals live to |
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355 // improve the debugging experience so only set them if the selected |
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356 // capabilities look like a debugger. |
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357 JvmtiExport::set_can_access_local_variables( |
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358 avail.can_access_local_variables || |
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359 avail.can_generate_breakpoint_events || |
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360 avail.can_generate_frame_pop_events); |
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361 JvmtiExport::set_can_post_on_exceptions( |
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362 avail.can_generate_exception_events || |
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363 avail.can_generate_frame_pop_events || |
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364 avail.can_generate_method_exit_events); |
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365 JvmtiExport::set_can_post_breakpoint(avail.can_generate_breakpoint_events); |
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366 JvmtiExport::set_can_post_field_access(avail.can_generate_field_access_events); |
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367 JvmtiExport::set_can_post_field_modification(avail.can_generate_field_modification_events); |
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368 JvmtiExport::set_can_post_method_entry(avail.can_generate_method_entry_events); |
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369 JvmtiExport::set_can_post_method_exit(avail.can_generate_method_exit_events || |
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370 avail.can_generate_frame_pop_events); |
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371 JvmtiExport::set_can_pop_frame(avail.can_pop_frame); |
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372 JvmtiExport::set_can_force_early_return(avail.can_force_early_return); |
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373 JvmtiExport::set_should_clean_up_heap_objects(avail.can_generate_breakpoint_events); |
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374 } |
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375 |
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376 #ifndef PRODUCT |
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377 |
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378 void JvmtiManageCapabilities:: print(const jvmtiCapabilities* cap) { |
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379 log_trace(jvmti)("----- capabilities -----"); |
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380 if (cap->can_tag_objects) |
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381 log_trace(jvmti)("can_tag_objects"); |
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382 if (cap->can_generate_field_modification_events) |
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383 log_trace(jvmti)("can_generate_field_modification_events"); |
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384 if (cap->can_generate_field_access_events) |
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385 log_trace(jvmti)("can_generate_field_access_events"); |
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386 if (cap->can_get_bytecodes) |
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387 log_trace(jvmti)("can_get_bytecodes"); |
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388 if (cap->can_get_synthetic_attribute) |
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389 log_trace(jvmti)("can_get_synthetic_attribute"); |
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390 if (cap->can_get_owned_monitor_info) |
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391 log_trace(jvmti)("can_get_owned_monitor_info"); |
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392 if (cap->can_get_current_contended_monitor) |
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393 log_trace(jvmti)("can_get_current_contended_monitor"); |
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394 if (cap->can_get_monitor_info) |
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395 log_trace(jvmti)("can_get_monitor_info"); |
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396 if (cap->can_get_constant_pool) |
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397 log_trace(jvmti)("can_get_constant_pool"); |
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398 if (cap->can_pop_frame) |
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399 log_trace(jvmti)("can_pop_frame"); |
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400 if (cap->can_force_early_return) |
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401 log_trace(jvmti)("can_force_early_return"); |
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402 if (cap->can_redefine_classes) |
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403 log_trace(jvmti)("can_redefine_classes"); |
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404 if (cap->can_retransform_classes) |
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405 log_trace(jvmti)("can_retransform_classes"); |
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406 if (cap->can_signal_thread) |
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407 log_trace(jvmti)("can_signal_thread"); |
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408 if (cap->can_get_source_file_name) |
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409 log_trace(jvmti)("can_get_source_file_name"); |
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410 if (cap->can_get_line_numbers) |
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411 log_trace(jvmti)("can_get_line_numbers"); |
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412 if (cap->can_get_source_debug_extension) |
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413 log_trace(jvmti)("can_get_source_debug_extension"); |
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414 if (cap->can_access_local_variables) |
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415 log_trace(jvmti)("can_access_local_variables"); |
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416 if (cap->can_maintain_original_method_order) |
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417 log_trace(jvmti)("can_maintain_original_method_order"); |
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418 if (cap->can_generate_single_step_events) |
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419 log_trace(jvmti)("can_generate_single_step_events"); |
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420 if (cap->can_generate_exception_events) |
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421 log_trace(jvmti)("can_generate_exception_events"); |
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422 if (cap->can_generate_frame_pop_events) |
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423 log_trace(jvmti)("can_generate_frame_pop_events"); |
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424 if (cap->can_generate_breakpoint_events) |
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425 log_trace(jvmti)("can_generate_breakpoint_events"); |
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426 if (cap->can_suspend) |
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427 log_trace(jvmti)("can_suspend"); |
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428 if (cap->can_redefine_any_class ) |
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429 log_trace(jvmti)("can_redefine_any_class"); |
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430 if (cap->can_retransform_any_class ) |
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431 log_trace(jvmti)("can_retransform_any_class"); |
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432 if (cap->can_get_current_thread_cpu_time) |
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433 log_trace(jvmti)("can_get_current_thread_cpu_time"); |
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434 if (cap->can_get_thread_cpu_time) |
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435 log_trace(jvmti)("can_get_thread_cpu_time"); |
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436 if (cap->can_generate_method_entry_events) |
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437 log_trace(jvmti)("can_generate_method_entry_events"); |
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438 if (cap->can_generate_method_exit_events) |
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439 log_trace(jvmti)("can_generate_method_exit_events"); |
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440 if (cap->can_generate_all_class_hook_events) |
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441 log_trace(jvmti)("can_generate_all_class_hook_events"); |
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442 if (cap->can_generate_compiled_method_load_events) |
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443 log_trace(jvmti)("can_generate_compiled_method_load_events"); |
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444 if (cap->can_generate_monitor_events) |
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445 log_trace(jvmti)("can_generate_monitor_events"); |
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446 if (cap->can_generate_vm_object_alloc_events) |
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447 log_trace(jvmti)("can_generate_vm_object_alloc_events"); |
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448 if (cap->can_generate_native_method_bind_events) |
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449 log_trace(jvmti)("can_generate_native_method_bind_events"); |
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450 if (cap->can_generate_garbage_collection_events) |
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451 log_trace(jvmti)("can_generate_garbage_collection_events"); |
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452 if (cap->can_generate_object_free_events) |
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453 log_trace(jvmti)("can_generate_object_free_events"); |
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454 if (cap->can_generate_resource_exhaustion_heap_events) |
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455 log_trace(jvmti)("can_generate_resource_exhaustion_heap_events"); |
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456 if (cap->can_generate_resource_exhaustion_threads_events) |
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457 log_trace(jvmti)("can_generate_resource_exhaustion_threads_events"); |
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458 if (cap->can_generate_early_vmstart) |
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459 log_trace(jvmti)("can_generate_early_vmstart"); |
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460 if (cap->can_generate_early_class_hook_events) |
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461 log_trace(jvmti)("can_generate_early_class_hook_events"); |
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462 } |
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463 |
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464 #endif |