1 /*
2 * Copyright (c) 1998, 2019, 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 "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 const methodHandle& methodH,
102 ciMethod* method,
103 int bci,
104 bool reexecute,
105 bool rethrow_exception = false,
106 bool is_method_handle_invoke = false,
107 bool return_oop = false,
108 DebugToken* locals = NULL,
109 DebugToken* expressions = NULL,
110 DebugToken* monitors = NULL);
111
112
113 void dump_object_pool(GrowableArray<ScopeValue*>* objects);
114
115 // This call must follow every add_safepoint,
116 // after any intervening describe_scope calls.
117 void end_safepoint(int pc_offset) { end_scopes(pc_offset, true); }
118 void end_non_safepoint(int pc_offset) { end_scopes(pc_offset, false); }
119
120 // helper fuctions for describe_scope to enable sharing
121 DebugToken* create_scope_values(GrowableArray<ScopeValue*>* values);
122 DebugToken* create_monitor_values(GrowableArray<MonitorValue*>* monitors);
123
124 // returns the size of the generated scopeDescs.
125 int data_size();
126 int pcs_size();
127 int oop_size() { return oop_recorder()->oop_size(); }
128 int metadata_size() { return oop_recorder()->metadata_size(); }
129
130 // copy the generated debugging information to nmethod
131 void copy_to(nmethod* nm);
132
133 // verifies the debug information
134 void verify(const nmethod* code);
135
136 static void print_statistics() PRODUCT_RETURN;
137
138 // Method for setting oopmaps to temporarily preserve old handling of oopmaps
139 OopMapSet *_oopmaps;
140 void set_oopmaps(OopMapSet *oopmaps) { _oopmaps = oopmaps; }
141
142 OopRecorder* oop_recorder() { return _oop_recorder; }
143
144 int last_pc_offset() { return last_pc()->pc_offset(); }
145
146 bool recording_non_safepoints() { return _recording_non_safepoints; }
147
148 PcDesc* pcs() const { return _pcs; }
149 int pcs_length() const { return _pcs_length; }
150
151 DebugInfoWriteStream* stream() const { return _stream; }
152
153
154 private:
155 friend class ScopeDesc;
156 friend class vframeStreamCommon;
157 friend class DIR_Chunk;
158
159 // True if we are recording non-safepoint scopes.
160 // This flag is set if DebugNonSafepoints is true, or if
161 // JVMTI post_compiled_method_load events are enabled.
162 const bool _recording_non_safepoints;
163
164 DebugInfoWriteStream* _stream;
165
166 OopRecorder* _oop_recorder;
167
168 // Scopes that have been described so far.
169 GrowableArray<DIR_Chunk*>* _all_chunks;
170 DIR_Chunk* _next_chunk;
171 DIR_Chunk* _next_chunk_limit;
172
173 #ifdef ASSERT
174 enum { rs_null, rs_safepoint, rs_non_safepoint };
175 int _recording_state;
176 #endif
177
178 PcDesc* _pcs;
179 int _pcs_size;
180 int _pcs_length;
181 // Note: Would use GrowableArray<PcDesc>, but structs are not supported.
182
183 // PC of most recent real safepoint before the current one,
184 // updated after end_scopes.
185 int _prev_safepoint_pc;
186
187 PcDesc* last_pc() {
188 guarantee(_pcs_length > 0, "a safepoint must be declared already");
189 return &_pcs[_pcs_length-1];
190 }
191 PcDesc* prev_pc() {
192 guarantee(_pcs_length > 1, "a safepoint must be declared already");
193 return &_pcs[_pcs_length-2];
194 }
195 void add_new_pc_offset(int pc_offset);
196 void end_scopes(int pc_offset, bool is_safepoint);
197
198 int serialize_monitor_values(GrowableArray<MonitorValue*>* monitors);
199 int serialize_scope_values(GrowableArray<ScopeValue*>* values);
200 int find_sharable_decode_offset(int stream_offset);
201
202 #ifndef PRODUCT
203 bool recorders_frozen();
204 void mark_recorders_frozen();
205 #endif // PRODUCT
206
207 public:
208 enum { serialized_null = 0 };
209 };
210
211 #endif // SHARE_CODE_DEBUGINFOREC_HPP