Mercurial > hg > truffle
annotate src/share/vm/code/debugInfoRec.hpp @ 1937:4853c5cad3aa
More deoptmization tracing.
author | Thomas Wuerthinger <wuerthinger@ssw.jku.at> |
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date | Thu, 23 Dec 2010 22:14:31 +0100 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
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0 | 1 /* |
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2 * Copyright (c) 1998, 2009, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 //** The DebugInformationRecorder collects debugging information | |
26 // for a compiled method. | |
27 // Debugging information is used for: | |
28 // - garbage collecting compiled frames | |
29 // - stack tracing across compiled frames | |
30 // - deoptimizating compiled frames | |
31 // | |
32 // The implementation requires the compiler to use the recorder | |
33 // in the following order: | |
34 // 1) Describe debug information for safepoints at increasing addresses. | |
35 // a) Add safepoint entry (use add_safepoint or add_non_safepoint) | |
36 // b) Describe scopes for that safepoint | |
37 // - create locals if needed (use create_scope_values) | |
38 // - create expressions if needed (use create_scope_values) | |
39 // - create monitor stack if needed (use create_monitor_values) | |
40 // - describe scope (use describe_scope) | |
41 // "repeat last four steps for all scopes" | |
42 // "outer most scope first and inner most scope last" | |
43 // NB: nodes from create_scope_values and create_locations | |
44 // can be reused for simple sharing. | |
45 // - mark the end of the scopes (end_safepoint or end_non_safepoint) | |
46 // 2) Use oop_size, data_size, pcs_size to create the nmethod and | |
47 // finally migrate the debugging information into the nmethod | |
48 // by calling copy_to. | |
49 | |
50 class DebugToken; // Opaque datatype for stored: | |
51 // - GrowableArray<ScopeValue*> | |
52 // - GrowableArray<MonitorValue*> | |
53 | |
54 // Alias for InvocationEntryBci. | |
55 // Both constants are used for a pseudo-BCI which refers | |
56 // to the state just _before_ a method is entered. | |
57 // SynchronizationEntryBCI is used where the emphasis | |
58 // is on the implicit monitorenter of a synchronized method. | |
59 const int SynchronizationEntryBCI = InvocationEntryBci; | |
60 | |
61 class DIR_Chunk; // private class, a nugget of collected information | |
62 | |
63 class DebugInformationRecorder: public ResourceObj { | |
64 public: | |
65 // constructor | |
66 DebugInformationRecorder(OopRecorder* oop_recorder); | |
67 | |
68 // adds an oopmap at a specific offset | |
69 void add_oopmap(int pc_offset, OopMap* map); | |
70 | |
71 // adds a jvm mapping at pc-offset, for a safepoint only | |
72 void add_safepoint(int pc_offset, OopMap* map); | |
73 | |
74 // adds a jvm mapping at pc-offset, for a non-safepoint (profile point) | |
75 void add_non_safepoint(int pc_offset); | |
76 | |
77 // Describes debugging information for a scope at the given pc_offset. | |
78 // Calls must be in non-decreasing order of pc_offset. | |
79 // If there are several calls at a single pc_offset, | |
80 // then they occur in the same order as they were performed by the JVM, | |
81 // with the most recent (innermost) call being described last. | |
82 // For a safepoint, the pc_offset must have been mentioned | |
83 // previously by add_safepoint. | |
84 // Otherwise, the pc_offset must have been mentioned previously | |
85 // by add_non_safepoint, and the locals, expressions, and monitors | |
86 // must all be null. | |
87 void describe_scope(int pc_offset, | |
88 ciMethod* method, | |
89 int bci, | |
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90 bool reexecute, |
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91 bool is_method_handle_invoke = false, |
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92 bool return_oop = false, |
0 | 93 DebugToken* locals = NULL, |
94 DebugToken* expressions = NULL, | |
95 DebugToken* monitors = NULL); | |
96 | |
97 | |
98 void dump_object_pool(GrowableArray<ScopeValue*>* objects); | |
99 | |
100 // This call must follow every add_safepoint, | |
101 // after any intervening describe_scope calls. | |
102 void end_safepoint(int pc_offset) { end_scopes(pc_offset, true); } | |
103 void end_non_safepoint(int pc_offset) { end_scopes(pc_offset, false); } | |
104 | |
105 // helper fuctions for describe_scope to enable sharing | |
106 DebugToken* create_scope_values(GrowableArray<ScopeValue*>* values); | |
107 DebugToken* create_monitor_values(GrowableArray<MonitorValue*>* monitors); | |
108 | |
109 // returns the size of the generated scopeDescs. | |
110 int data_size(); | |
111 int pcs_size(); | |
112 int oop_size() { return oop_recorder()->oop_size(); } | |
113 | |
114 // copy the generated debugging information to nmethod | |
115 void copy_to(nmethod* nm); | |
116 | |
117 // verifies the debug information | |
118 void verify(const nmethod* code); | |
119 | |
120 static void print_statistics() PRODUCT_RETURN; | |
121 | |
122 // Method for setting oopmaps to temporarily preserve old handling of oopmaps | |
123 OopMapSet *_oopmaps; | |
124 void set_oopmaps(OopMapSet *oopmaps) { _oopmaps = oopmaps; } | |
125 | |
126 OopRecorder* oop_recorder() { return _oop_recorder; } | |
127 | |
128 int last_pc_offset() { return last_pc()->pc_offset(); } | |
129 | |
130 bool recording_non_safepoints() { return _recording_non_safepoints; } | |
131 | |
132 private: | |
133 friend class ScopeDesc; | |
134 friend class vframeStreamCommon; | |
135 friend class DIR_Chunk; | |
136 | |
137 // True if we are recording non-safepoint scopes. | |
138 // This flag is set if DebugNonSafepoints is true, or if | |
139 // JVMTI post_compiled_method_load events are enabled. | |
140 const bool _recording_non_safepoints; | |
141 | |
142 DebugInfoWriteStream* _stream; | |
143 | |
144 DebugInfoWriteStream* stream() const { return _stream; } | |
145 | |
146 OopRecorder* _oop_recorder; | |
147 | |
148 // Scopes that have been described so far. | |
149 GrowableArray<DIR_Chunk*>* _all_chunks; | |
150 GrowableArray<DIR_Chunk*>* _shared_chunks; | |
151 DIR_Chunk* _next_chunk; | |
152 DIR_Chunk* _next_chunk_limit; | |
153 | |
154 #ifdef ASSERT | |
155 enum { rs_null, rs_safepoint, rs_non_safepoint }; | |
156 int _recording_state; | |
157 #endif | |
158 | |
159 PcDesc* _pcs; | |
160 int _pcs_size; | |
161 int _pcs_length; | |
162 // Note: Would use GrowableArray<PcDesc>, but structs are not supported. | |
163 | |
164 // PC of most recent real safepoint before the current one, | |
165 // updated after end_scopes. | |
166 int _prev_safepoint_pc; | |
167 | |
168 PcDesc* last_pc() { | |
169 guarantee(_pcs_length > 0, "a safepoint must be declared already"); | |
170 return &_pcs[_pcs_length-1]; | |
171 } | |
172 PcDesc* prev_pc() { | |
173 guarantee(_pcs_length > 1, "a safepoint must be declared already"); | |
174 return &_pcs[_pcs_length-2]; | |
175 } | |
176 void add_new_pc_offset(int pc_offset); | |
177 void end_scopes(int pc_offset, bool is_safepoint); | |
178 | |
179 int serialize_monitor_values(GrowableArray<MonitorValue*>* monitors); | |
180 int serialize_scope_values(GrowableArray<ScopeValue*>* values); | |
181 int find_sharable_decode_offset(int stream_offset); | |
182 | |
183 public: | |
184 enum { serialized_null = 0 }; | |
185 }; |