1 /* 2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_PRIMS_JVMTIENVTHREADSTATE_HPP 26 #define SHARE_VM_PRIMS_JVMTIENVTHREADSTATE_HPP 27 28 #include "jvmtifiles/jvmti.h" 29 #include "memory/allocation.hpp" 30 #include "oops/instanceKlass.hpp" 31 #include "prims/jvmtiEventController.hpp" 32 #include "utilities/globalDefinitions.hpp" 33 #include "utilities/growableArray.hpp" 34 35 class JvmtiEnv; 36 37 /////////////////////////////////////////////////////////////// 38 // 39 // class JvmtiFramePop 40 // Used by : JvmtiFramePops 41 // Used by JVMTI methods: none directly. 42 // 43 // Wrapper class for FramePop, used in the JvmtiFramePops class. 44 // 45 // Two problems: 1) this isn't being used as a ValueObj class, in 46 // several places there are constructors for it. 2) It seems like 47 // overkill as a means to get an assert and name the geater than 48 // operator. I'm trying to to rewrite everything. 49 50 class JvmtiFramePop VALUE_OBJ_CLASS_SPEC { 51 private: 52 // Frame number counting from BOTTOM (oldest) frame; 53 // bottom frame == #0 54 int _frame_number; 55 public: 56 JvmtiFramePop() {} 57 JvmtiFramePop(int frame_number) { 58 assert(frame_number >= 0, "invalid frame number"); 59 _frame_number = frame_number; 60 } 61 62 int frame_number() { return _frame_number; } 63 int above_on_stack(JvmtiFramePop& other) { return _frame_number > other._frame_number; } 64 void print() PRODUCT_RETURN; 65 }; 66 67 68 /////////////////////////////////////////////////////////////// 69 // 70 // class JvmtiFramePops 71 // Used by : JvmtiThreadState 72 // Used by JVMTI methods: none directly. 73 // 74 // A collection of JvmtiFramePop. 75 // It records what frames on a threads stack should post frame_pop events when they're exited. 76 // 77 78 class JvmtiFramePops : public CHeapObj<mtInternal> { 79 private: 80 GrowableArray<int>* _pops; 81 82 // should only be used by JvmtiEventControllerPrivate 83 // to insure they only occur at safepoints. 84 // Todo: add checks for safepoint 85 friend class JvmtiEventControllerPrivate; 86 void set(JvmtiFramePop& fp); 87 void clear(JvmtiFramePop& fp); 88 int clear_to(JvmtiFramePop& fp); 89 90 public: 91 JvmtiFramePops(); 92 ~JvmtiFramePops(); 93 94 bool contains(JvmtiFramePop& fp) { return _pops->contains(fp.frame_number()); } 95 int length() { return _pops->length(); } 96 void print() PRODUCT_RETURN; 97 }; 98 99 100 /////////////////////////////////////////////////////////////// 101 // 102 // class JvmtiEnvThreadState 103 // 104 // 2. Cache of pending frame_pop_events, created by NotifyFramePop 105 // and lazily initialized. 106 // 3: Location of last executed instruction, used to filter out duplicate 107 // events due to instruction rewriting. 108 109 class JvmtiEnvThreadState : public CHeapObj<mtInternal> { 110 private: 111 friend class JvmtiEnv; 112 JavaThread *_thread; 113 JvmtiEnv *_env; 114 JvmtiEnvThreadState *_next; 115 jmethodID _current_method_id; 116 int _current_bci; 117 bool _breakpoint_posted; 118 bool _single_stepping_posted; 119 JvmtiEnvThreadEventEnable _event_enable; 120 void *_agent_thread_local_storage_data; // per env and per thread agent allocated data. 121 122 // Class used to store pending framepops. 123 // lazily initialized by get_frame_pops(); 124 JvmtiFramePops *_frame_pops; 125 126 inline void set_current_location(jmethodID method_id, int bci) { 127 _current_method_id = method_id; 128 _current_bci = bci; 129 } 130 131 friend class JvmtiEnvThreadStateIterator; 132 JvmtiEnvThreadState* next() { return _next; } 133 134 friend class JvmtiThreadState; 135 void set_next(JvmtiEnvThreadState* link) { _next = link; } 136 137 public: 138 JvmtiEnvThreadState(JavaThread *thread, JvmtiEnvBase *env); 139 ~JvmtiEnvThreadState(); 140 141 bool is_enabled(jvmtiEvent event_type) { return _event_enable.is_enabled(event_type); } 142 143 JvmtiEnvThreadEventEnable *event_enable() { return &_event_enable; } 144 void *get_agent_thread_local_storage_data() { return _agent_thread_local_storage_data; } 145 void set_agent_thread_local_storage_data (void *data) { _agent_thread_local_storage_data = data; } 146 147 148 // If the thread is in the given method at the given 149 // location just return. Otherwise, reset the current location 150 // and reset _breakpoint_posted and _single_stepping_posted. 151 // _breakpoint_posted and _single_stepping_posted are only cleared 152 // here. 153 void compare_and_set_current_location(Method* method, address location, jvmtiEvent event); 154 155 void clear_current_location() { set_current_location((jmethodID)NULL, 0); } 156 157 void reset_current_location(jvmtiEvent event, bool enabled); 158 159 inline void set_breakpoint_posted() { _breakpoint_posted = true; } 160 inline void set_single_stepping_posted() { 161 _single_stepping_posted = true; 162 } 163 inline bool breakpoint_posted() { return _breakpoint_posted; } 164 inline bool single_stepping_posted() { 165 return _single_stepping_posted; 166 } 167 168 inline JavaThread *get_thread() { return _thread; } 169 inline JvmtiEnv *get_env() { return _env; } 170 171 // lazily initialize _frame_pops 172 JvmtiFramePops* get_frame_pops(); 173 174 bool has_frame_pops(); 175 176 // quickly test whether we should deliver a frame pop event on return from sp 177 bool is_frame_pop(int cur_stack_depth); 178 179 void set_frame_pop(int frame_number); 180 void clear_frame_pop(int frame_number); 181 void clear_to_frame_pop(int frame_number); 182 183 }; 184 185 #endif // SHARE_VM_PRIMS_JVMTIENVTHREADSTATE_HPP