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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 #ifndef _JAVA_JVMTIENVTHREADSTATE_H_
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25 #define _JAVA_JVMTIENVTHREADSTATE_H_
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26
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27 ///////////////////////////////////////////////////////////////
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28 //
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29 // class JvmtiFramePop
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30 // Used by : JvmtiFramePops
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31 // Used by JVMTI methods: none directly.
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32 //
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33 // Wrapper class for FramePop, used in the JvmtiFramePops class.
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34 //
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35 // Two problems: 1) this isn't being used as a ValueObj class, in
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36 // several places there are constructors for it. 2) It seems like
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37 // overkill as a means to get an assert and name the geater than
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38 // operator. I'm trying to to rewrite everything.
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39
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40 class JvmtiFramePop VALUE_OBJ_CLASS_SPEC {
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41 private:
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42 // Frame number counting from BOTTOM (oldest) frame;
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43 // bottom frame == #0
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44 int _frame_number;
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45 public:
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46 JvmtiFramePop() {}
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47 JvmtiFramePop(int frame_number) {
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48 assert(frame_number >= 0, "invalid frame number");
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49 _frame_number = frame_number;
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50 }
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51
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52 int frame_number() { return _frame_number; }
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53 int above_on_stack(JvmtiFramePop& other) { return _frame_number > other._frame_number; }
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54 void print() PRODUCT_RETURN;
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55 };
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56
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57
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58 ///////////////////////////////////////////////////////////////
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59 //
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60 // class JvmtiFramePops
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61 // Used by : JvmtiThreadState
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62 // Used by JVMTI methods: none directly.
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63 //
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64 // A collection of JvmtiFramePop.
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65 // It records what frames on a threads stack should post frame_pop events when they're exited.
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66 //
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67
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68 class JvmtiFramePops : public CHeapObj {
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69 private:
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70 GrowableArray<int>* _pops;
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71
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72 // should only be used by JvmtiEventControllerPrivate
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73 // to insure they only occur at safepoints.
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74 // Todo: add checks for safepoint
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75 friend class JvmtiEventControllerPrivate;
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76 void set(JvmtiFramePop& fp);
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77 void clear(JvmtiFramePop& fp);
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78 int clear_to(JvmtiFramePop& fp);
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79
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80 public:
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81 JvmtiFramePops();
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82 ~JvmtiFramePops();
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83
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84 bool contains(JvmtiFramePop& fp) { return _pops->contains(fp.frame_number()); }
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85 int length() { return _pops->length(); }
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86 void print() PRODUCT_RETURN;
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87 };
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88
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89
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90 ///////////////////////////////////////////////////////////////
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91 //
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92 // class JvmtiEnvThreadState
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93 //
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94 // 2. Cache of pending frame_pop_events, created by NotifyFramePop
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95 // and lazily initialized.
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96 // 3: Location of last executed instruction, used to filter out duplicate
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97 // events due to instruction rewriting.
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98
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99 class JvmtiEnvThreadState : public CHeapObj {
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100 private:
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101 friend class JvmtiEnv;
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102 JavaThread *_thread;
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103 JvmtiEnv *_env;
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104 JvmtiEnvThreadState *_next;
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105 jmethodID _current_method_id;
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106 int _current_bci;
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107 bool _breakpoint_posted;
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108 bool _single_stepping_posted;
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109 JvmtiEnvThreadEventEnable _event_enable;
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110 void *_agent_thread_local_storage_data; // per env and per thread agent allocated data.
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111
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112 // Class used to store pending framepops.
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113 // lazily initialized by get_frame_pops();
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114 JvmtiFramePops *_frame_pops;
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115
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116 inline void set_current_location(jmethodID method_id, int bci) {
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117 _current_method_id = method_id;
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118 _current_bci = bci;
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119 }
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120
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121 friend class JvmtiEnvThreadStateIterator;
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122 JvmtiEnvThreadState* next() { return _next; }
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123
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124 friend class JvmtiThreadState;
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125 void set_next(JvmtiEnvThreadState* link) { _next = link; }
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126
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127 public:
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128 JvmtiEnvThreadState(JavaThread *thread, JvmtiEnvBase *env);
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129 ~JvmtiEnvThreadState();
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130
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131 bool is_enabled(jvmtiEvent event_type) { return _event_enable.is_enabled(event_type); }
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132
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133 JvmtiEnvThreadEventEnable *event_enable() { return &_event_enable; }
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134 void *get_agent_thread_local_storage_data() { return _agent_thread_local_storage_data; }
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135 void set_agent_thread_local_storage_data (void *data) { _agent_thread_local_storage_data = data; }
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136
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137
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138 // If the thread is in the given method at the given
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139 // location just return. Otherwise, reset the current location
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140 // and reset _breakpoint_posted and _single_stepping_posted.
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141 // _breakpoint_posted and _single_stepping_posted are only cleared
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142 // here.
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143 void compare_and_set_current_location(methodOop method, address location, jvmtiEvent event);
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144
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145 void clear_current_location() { set_current_location((jmethodID)NULL, 0); }
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146
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147 void reset_current_location(jvmtiEvent event, bool enabled);
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148
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149 inline void set_breakpoint_posted() { _breakpoint_posted = true; }
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150 inline void set_single_stepping_posted() {
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151 _single_stepping_posted = true;
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152 }
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153 inline bool breakpoint_posted() { return _breakpoint_posted; }
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154 inline bool single_stepping_posted() {
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155 return _single_stepping_posted;
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156 }
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157
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158 inline JavaThread *get_thread() { return _thread; }
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159 inline JvmtiEnv *get_env() { return _env; }
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160
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161 // lazily initialize _frame_pops
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162 JvmtiFramePops* get_frame_pops();
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163
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164 bool has_frame_pops();
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165
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166 // quickly test whether we should deliver a frame pop event on return from sp
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167 bool is_frame_pop(int cur_stack_depth);
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168
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169 void set_frame_pop(int frame_number);
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170 void clear_frame_pop(int frame_number);
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171 void clear_to_frame_pop(int frame_number);
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172
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173 };
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174
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175 #endif /* _JAVA_JVMTIENVTHREADSTATE_H_ */
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