1 /*
2 * Copyright (c) 1998, 2023, 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.
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23 */
24
25 #ifndef SHARE_CODE_DEBUGINFOREC_HPP
26 #define SHARE_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 "oops/oop.hpp"
35 #include "utilities/growableArray.hpp"
36
37 class OopMap;
38 class OopMapSet;
39
40 //** The DebugInformationRecorder collects debugging information
41 // for a compiled method.
42 // Debugging information is used for:
43 // - garbage collecting compiled frames
44 // - stack tracing across compiled frames
45 // - deoptimizating compiled frames
46 //
47 // The implementation requires the compiler to use the recorder
48 // in the following order:
49 // 1) Describe debug information for safepoints at increasing addresses.
50 // a) Add safepoint entry (use add_safepoint or add_non_safepoint)
51 // b) Describe scopes for that safepoint
52 // - create locals if needed (use create_scope_values)
53 // - create expressions if needed (use create_scope_values)
54 // - create monitor stack if needed (use create_monitor_values)
55 // - describe scope (use describe_scope)
56 // "repeat last four steps for all scopes"
57 // "outer most scope first and inner most scope last"
58 // NB: nodes from create_scope_values and create_locations
59 // can be reused for simple sharing.
60 // - mark the end of the scopes (end_safepoint or end_non_safepoint)
61 // 2) Use oop_size, metadata_size, data_size, pcs_size to create the nmethod
62 // and finally migrate the debugging information into the nmethod
63 // by calling copy_to.
64
65 class DebugToken; // Opaque datatype for stored:
66 // - GrowableArray<ScopeValue*>
67 // - GrowableArray<MonitorValue*>
68
69 // Alias for InvocationEntryBci.
70 // Both constants are used for a pseudo-BCI which refers
71 // to the state just _before_ a method is entered.
72 // SynchronizationEntryBCI is used where the emphasis
73 // is on the implicit monitorenter of a synchronized method.
74 const int SynchronizationEntryBCI = InvocationEntryBci;
75
76 class DIR_Chunk; // private class, a nugget of collected information
77
78 class DebugInformationRecorder: public ResourceObj {
79 public:
80 // constructor
81 DebugInformationRecorder(OopRecorder* oop_recorder);
82
83 // adds an oopmap at a specific offset
84 void add_oopmap(int pc_offset, OopMap* map);
85
86 // adds a jvm mapping at pc-offset, for a safepoint only
87 void add_safepoint(int pc_offset, OopMap* map);
88
89 // adds a jvm mapping at pc-offset, for a non-safepoint (profile point)
90 void add_non_safepoint(int pc_offset);
91
92 // Describes debugging information for a scope at the given pc_offset.
93 // Calls must be in non-decreasing order of pc_offset.
94 // If there are several calls at a single pc_offset,
95 // then they occur in the same order as they were performed by the JVM,
96 // with the most recent (innermost) call being described last.
97 // For a safepoint, the pc_offset must have been mentioned
98 // previously by add_safepoint.
99 // Otherwise, the pc_offset must have been mentioned previously
100 // by add_non_safepoint, and the locals, expressions, and monitors
101 // must all be null.
102 void describe_scope(int pc_offset,
103 const methodHandle& methodH,
104 ciMethod* method,
105 int bci,
106 bool reexecute,
107 bool rethrow_exception = false,
108 bool is_method_handle_invoke = false,
109 bool return_oop = false,
110 bool return_scalarized = false,
111 bool has_ea_local_in_scope = false,
112 bool arg_escape = false,
113 DebugToken* locals = nullptr,
114 DebugToken* expressions = nullptr,
115 DebugToken* monitors = nullptr);
116
117
118 void dump_object_pool(GrowableArray<ScopeValue*>* objects);
119
120 // This call must follow every add_safepoint,
121 // after any intervening describe_scope calls.
122 void end_safepoint(int pc_offset) { end_scopes(pc_offset, true); }
123 void end_non_safepoint(int pc_offset) { end_scopes(pc_offset, false); }
124
125 // helper functions for describe_scope to enable sharing
126 DebugToken* create_scope_values(GrowableArray<ScopeValue*>* values);
127 DebugToken* create_monitor_values(GrowableArray<MonitorValue*>* monitors);
128
129 // returns the size of the generated scopeDescs.
130 int data_size();
131 int pcs_size();
132 int oop_size() { return oop_recorder()->oop_size(); }
133 int metadata_size() { return oop_recorder()->metadata_size(); }
134
135 // copy the generated debugging information to nmethod
136 void copy_to(nmethod* nm);
137
138 // verifies the debug information
139 void verify(const nmethod* code);
140
141 static void print_statistics() PRODUCT_RETURN;
142
143 // Method for setting oopmaps to temporarily preserve old handling of oopmaps
144 OopMapSet *_oopmaps;
145 void set_oopmaps(OopMapSet *oopmaps) { _oopmaps = oopmaps; }
146
147 OopRecorder* oop_recorder() { return _oop_recorder; }
148
149 int last_pc_offset() { return last_pc()->pc_offset(); }
150
151 bool recording_non_safepoints() { return _recording_non_safepoints; }
152
153 PcDesc* pcs() const { return _pcs; }
154 int pcs_length() const { return _pcs_length; }
155
156 DebugInfoWriteStream* stream() const { return _stream; }
157
158
159 private:
160 friend class ScopeDesc;
161 friend class vframeStreamCommon;
162 friend class DIR_Chunk;
163
164 // True if we are recording non-safepoint scopes.
165 // This flag is set if DebugNonSafepoints is true, or if
166 // JVMTI post_compiled_method_load events are enabled.
167 const bool _recording_non_safepoints;
168
169 DebugInfoWriteStream* _stream;
170
171 OopRecorder* _oop_recorder;
172
173 // Scopes that have been described so far.
174 GrowableArray<DIR_Chunk*>* _all_chunks;
175 DIR_Chunk* _next_chunk;
176 DIR_Chunk* _next_chunk_limit;
177
178 #ifdef ASSERT
179 enum { rs_null, rs_safepoint, rs_non_safepoint };
180 int _recording_state;
181 #endif
182
183 PcDesc* _pcs;
184 int _pcs_size;
185 int _pcs_length;
186 // Note: Would use GrowableArray<PcDesc>, but structs are not supported.
187
188 // PC of most recent real safepoint before the current one,
189 // updated after end_scopes.
190 int _prev_safepoint_pc;
191
192 PcDesc* last_pc() {
193 guarantee(_pcs_length > 0, "a safepoint must be declared already");
194 return &_pcs[_pcs_length-1];
195 }
196 PcDesc* prev_pc() {
197 guarantee(_pcs_length > 1, "a safepoint must be declared already");
198 return &_pcs[_pcs_length-2];
199 }
200 void add_new_pc_offset(int pc_offset);
201 void end_scopes(int pc_offset, bool is_safepoint);
202
203 int serialize_monitor_values(GrowableArray<MonitorValue*>* monitors);
204 int serialize_scope_values(GrowableArray<ScopeValue*>* values);
205 int find_sharable_decode_offset(int stream_offset);
206
207 #ifndef PRODUCT
208 bool recorders_frozen();
209 void mark_recorders_frozen();
210 #endif // PRODUCT
211
212 public:
213 enum { serialized_null = 0 };
214 };
215
216 #endif // SHARE_CODE_DEBUGINFOREC_HPP