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 "memory/allocation.inline.hpp" 31 #include "oops/instanceKlass.hpp" 32 #include "prims/jvmtiEventController.hpp" 33 #include "utilities/globalDefinitions.hpp" 34 #include "utilities/growableArray.hpp" 35 36 class JvmtiEnv; 37 38 /////////////////////////////////////////////////////////////// 39 // 40 // class JvmtiFramePop 41 // Used by : JvmtiFramePops 42 // Used by JVMTI methods: none directly. 43 // 44 // Wrapper class for FramePop, used in the JvmtiFramePops class. 45 // 46 // Two problems: 1) this isn't being used as a ValueObj class, in 47 // several places there are constructors for it. 2) It seems like 48 // overkill as a means to get an assert and name the geater than 49 // operator. I'm trying to to rewrite everything. 50 51 class JvmtiFramePop VALUE_OBJ_CLASS_SPEC { 52 private: 53 // Frame number counting from BOTTOM (oldest) frame; 54 // bottom frame == #0 55 int _frame_number; 56 public: JvmtiFramePop()57 JvmtiFramePop() {} JvmtiFramePop(int frame_number)58 JvmtiFramePop(int frame_number) { 59 assert(frame_number >= 0, "invalid frame number"); 60 _frame_number = frame_number; 61 } 62 frame_number()63 int frame_number() { return _frame_number; } above_on_stack(JvmtiFramePop & other)64 int above_on_stack(JvmtiFramePop& other) { return _frame_number > other._frame_number; } 65 void print() PRODUCT_RETURN; 66 }; 67 68 69 /////////////////////////////////////////////////////////////// 70 // 71 // class JvmtiFramePops 72 // Used by : JvmtiThreadState 73 // Used by JVMTI methods: none directly. 74 // 75 // A collection of JvmtiFramePop. 76 // It records what frames on a threads stack should post frame_pop events when they're exited. 77 // 78 79 class JvmtiFramePops : public CHeapObj<mtInternal> { 80 private: 81 GrowableArray<int>* _pops; 82 83 // should only be used by JvmtiEventControllerPrivate 84 // to insure they only occur at safepoints. 85 // Todo: add checks for safepoint 86 friend class JvmtiEventControllerPrivate; 87 void set(JvmtiFramePop& fp); 88 void clear(JvmtiFramePop& fp); 89 int clear_to(JvmtiFramePop& fp); 90 91 public: 92 JvmtiFramePops(); 93 ~JvmtiFramePops(); 94 contains(JvmtiFramePop & fp)95 bool contains(JvmtiFramePop& fp) { return _pops->contains(fp.frame_number()); } length()96 int length() { return _pops->length(); } 97 void print() PRODUCT_RETURN; 98 }; 99 100 101 /////////////////////////////////////////////////////////////// 102 // 103 // class JvmtiEnvThreadState 104 // 105 // 2. Cache of pending frame_pop_events, created by NotifyFramePop 106 // and lazily initialized. 107 // 3: Location of last executed instruction, used to filter out duplicate 108 // events due to instruction rewriting. 109 110 class JvmtiEnvThreadState : public CHeapObj<mtInternal> { 111 private: 112 friend class JvmtiEnv; 113 JavaThread *_thread; 114 JvmtiEnv *_env; 115 JvmtiEnvThreadState *_next; 116 jmethodID _current_method_id; 117 int _current_bci; 118 bool _breakpoint_posted; 119 bool _single_stepping_posted; 120 JvmtiEnvThreadEventEnable _event_enable; 121 void *_agent_thread_local_storage_data; // per env and per thread agent allocated data. 122 123 // Class used to store pending framepops. 124 // lazily initialized by get_frame_pops(); 125 JvmtiFramePops *_frame_pops; 126 set_current_location(jmethodID method_id,int bci)127 inline void set_current_location(jmethodID method_id, int bci) { 128 _current_method_id = method_id; 129 _current_bci = bci; 130 } 131 132 friend class JvmtiEnvThreadStateIterator; next()133 JvmtiEnvThreadState* next() { return _next; } 134 135 friend class JvmtiThreadState; set_next(JvmtiEnvThreadState * link)136 void set_next(JvmtiEnvThreadState* link) { _next = link; } 137 138 public: 139 JvmtiEnvThreadState(JavaThread *thread, JvmtiEnvBase *env); 140 ~JvmtiEnvThreadState(); 141 is_enabled(jvmtiEvent event_type)142 bool is_enabled(jvmtiEvent event_type) { return _event_enable.is_enabled(event_type); } 143 event_enable()144 JvmtiEnvThreadEventEnable *event_enable() { return &_event_enable; } get_agent_thread_local_storage_data()145 void *get_agent_thread_local_storage_data() { return _agent_thread_local_storage_data; } set_agent_thread_local_storage_data(void * data)146 void set_agent_thread_local_storage_data (void *data) { _agent_thread_local_storage_data = data; } 147 148 149 // If the thread is in the given method at the given 150 // location just return. Otherwise, reset the current location 151 // and reset _breakpoint_posted and _single_stepping_posted. 152 // _breakpoint_posted and _single_stepping_posted are only cleared 153 // here. 154 void compare_and_set_current_location(Method* method, address location, jvmtiEvent event); 155 clear_current_location()156 void clear_current_location() { set_current_location((jmethodID)NULL, 0); } 157 158 void reset_current_location(jvmtiEvent event, bool enabled); 159 set_breakpoint_posted()160 inline void set_breakpoint_posted() { _breakpoint_posted = true; } set_single_stepping_posted()161 inline void set_single_stepping_posted() { 162 _single_stepping_posted = true; 163 } breakpoint_posted()164 inline bool breakpoint_posted() { return _breakpoint_posted; } single_stepping_posted()165 inline bool single_stepping_posted() { 166 return _single_stepping_posted; 167 } 168 get_thread()169 inline JavaThread *get_thread() { return _thread; } get_env()170 inline JvmtiEnv *get_env() { return _env; } 171 172 // lazily initialize _frame_pops 173 JvmtiFramePops* get_frame_pops(); 174 175 bool has_frame_pops(); 176 177 // quickly test whether we should deliver a frame pop event on return from sp 178 bool is_frame_pop(int cur_stack_depth); 179 180 void set_frame_pop(int frame_number); 181 void clear_frame_pop(int frame_number); 182 void clear_to_frame_pop(int frame_number); 183 184 }; 185 186 #endif // SHARE_VM_PRIMS_JVMTIENVTHREADSTATE_HPP 187