1 /* 2 * Copyright (c) 1998, 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_CODE_DEBUGINFOREC_HPP 26 #define SHARE_VM_CODE_DEBUGINFOREC_HPP 27 28 #include "ci/ciClassList.hpp" 29 #include "ci/ciInstanceKlass.hpp" 30 #include "ci/ciMethod.hpp" 31 #include "code/debugInfo.hpp" 32 #include "code/location.hpp" 33 #include "code/pcDesc.hpp" 34 #include "compiler/oopMap.hpp" 35 #include "oops/oop.hpp" 36 #include "utilities/growableArray.hpp" 37 38 //** The DebugInformationRecorder collects debugging information 39 // for a compiled method. 40 // Debugging information is used for: 41 // - garbage collecting compiled frames 42 // - stack tracing across compiled frames 43 // - deoptimizating compiled frames 44 // 45 // The implementation requires the compiler to use the recorder 46 // in the following order: 47 // 1) Describe debug information for safepoints at increasing addresses. 48 // a) Add safepoint entry (use add_safepoint or add_non_safepoint) 49 // b) Describe scopes for that safepoint 50 // - create locals if needed (use create_scope_values) 51 // - create expressions if needed (use create_scope_values) 52 // - create monitor stack if needed (use create_monitor_values) 53 // - describe scope (use describe_scope) 54 // "repeat last four steps for all scopes" 55 // "outer most scope first and inner most scope last" 56 // NB: nodes from create_scope_values and create_locations 57 // can be reused for simple sharing. 58 // - mark the end of the scopes (end_safepoint or end_non_safepoint) 59 // 2) Use oop_size, metadata_size, data_size, pcs_size to create the nmethod 60 // and finally migrate the debugging information into the nmethod 61 // by calling copy_to. 62 63 class DebugToken; // Opaque datatype for stored: 64 // - GrowableArray<ScopeValue*> 65 // - GrowableArray<MonitorValue*> 66 67 // Alias for InvocationEntryBci. 68 // Both constants are used for a pseudo-BCI which refers 69 // to the state just _before_ a method is entered. 70 // SynchronizationEntryBCI is used where the emphasis 71 // is on the implicit monitorenter of a synchronized method. 72 const int SynchronizationEntryBCI = InvocationEntryBci; 73 74 class DIR_Chunk; // private class, a nugget of collected information 75 76 class DebugInformationRecorder: public ResourceObj { 77 public: 78 // constructor 79 DebugInformationRecorder(OopRecorder* oop_recorder); 80 81 // adds an oopmap at a specific offset 82 void add_oopmap(int pc_offset, OopMap* map); 83 84 // adds a jvm mapping at pc-offset, for a safepoint only 85 void add_safepoint(int pc_offset, OopMap* map); 86 87 // adds a jvm mapping at pc-offset, for a non-safepoint (profile point) 88 void add_non_safepoint(int pc_offset); 89 90 // Describes debugging information for a scope at the given pc_offset. 91 // Calls must be in non-decreasing order of pc_offset. 92 // If there are several calls at a single pc_offset, 93 // then they occur in the same order as they were performed by the JVM, 94 // with the most recent (innermost) call being described last. 95 // For a safepoint, the pc_offset must have been mentioned 96 // previously by add_safepoint. 97 // Otherwise, the pc_offset must have been mentioned previously 98 // by add_non_safepoint, and the locals, expressions, and monitors 99 // must all be null. 100 void describe_scope(int pc_offset, 101 ciMethod* method, 102 int bci, 103 bool reexecute, 104 bool is_method_handle_invoke = false, 105 bool return_oop = false, 106 DebugToken* locals = NULL, 107 DebugToken* expressions = NULL, 108 DebugToken* monitors = NULL); 109 110 111 void dump_object_pool(GrowableArray<ScopeValue*>* objects); 112 113 // This call must follow every add_safepoint, 114 // after any intervening describe_scope calls. 115 void end_safepoint(int pc_offset) { end_scopes(pc_offset, true); } 116 void end_non_safepoint(int pc_offset) { end_scopes(pc_offset, false); } 117 118 // helper fuctions for describe_scope to enable sharing 119 DebugToken* create_scope_values(GrowableArray<ScopeValue*>* values); 120 DebugToken* create_monitor_values(GrowableArray<MonitorValue*>* monitors); 121 122 // returns the size of the generated scopeDescs. 123 int data_size(); 124 int pcs_size(); 125 int oop_size() { return oop_recorder()->oop_size(); } 126 int metadata_size() { return oop_recorder()->metadata_size(); } 127 128 // copy the generated debugging information to nmethod 129 void copy_to(nmethod* nm); 130 131 // verifies the debug information 132 void verify(const nmethod* code); 133 134 static void print_statistics() PRODUCT_RETURN; 135 136 // Method for setting oopmaps to temporarily preserve old handling of oopmaps 137 OopMapSet *_oopmaps; 138 void set_oopmaps(OopMapSet *oopmaps) { _oopmaps = oopmaps; } 139 140 OopRecorder* oop_recorder() { return _oop_recorder; } 141 142 int last_pc_offset() { return last_pc()->pc_offset(); } 143 144 bool recording_non_safepoints() { return _recording_non_safepoints; } 145 146 private: 147 friend class ScopeDesc; 148 friend class vframeStreamCommon; 149 friend class DIR_Chunk; 150 151 // True if we are recording non-safepoint scopes. 152 // This flag is set if DebugNonSafepoints is true, or if 153 // JVMTI post_compiled_method_load events are enabled. 154 const bool _recording_non_safepoints; 155 156 DebugInfoWriteStream* _stream; 157 158 DebugInfoWriteStream* stream() const { return _stream; } 159 160 OopRecorder* _oop_recorder; 161 162 // Scopes that have been described so far. 163 GrowableArray<DIR_Chunk*>* _all_chunks; 164 GrowableArray<DIR_Chunk*>* _shared_chunks; 165 DIR_Chunk* _next_chunk; 166 DIR_Chunk* _next_chunk_limit; 167 168 #ifdef ASSERT 169 enum { rs_null, rs_safepoint, rs_non_safepoint }; 170 int _recording_state; 171 #endif 172 173 PcDesc* _pcs; 174 int _pcs_size; 175 int _pcs_length; 176 // Note: Would use GrowableArray<PcDesc>, but structs are not supported. 177 178 // PC of most recent real safepoint before the current one, 179 // updated after end_scopes. 180 int _prev_safepoint_pc; 181 182 PcDesc* last_pc() { 183 guarantee(_pcs_length > 0, "a safepoint must be declared already"); 184 return &_pcs[_pcs_length-1]; 185 } 186 PcDesc* prev_pc() { 187 guarantee(_pcs_length > 1, "a safepoint must be declared already"); 188 return &_pcs[_pcs_length-2]; 189 } 190 void add_new_pc_offset(int pc_offset); 191 void end_scopes(int pc_offset, bool is_safepoint); 192 193 int serialize_monitor_values(GrowableArray<MonitorValue*>* monitors); 194 int serialize_scope_values(GrowableArray<ScopeValue*>* values); 195 int find_sharable_decode_offset(int stream_offset); 196 197 #ifndef PRODUCT 198 bool recorders_frozen(); 199 void mark_recorders_frozen(); 200 #endif // PRODUCT 201 202 public: 203 enum { serialized_null = 0 }; 204 }; 205 206 #endif // SHARE_VM_CODE_DEBUGINFOREC_HPP