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comparison: src/share/vm/code/debugInfo.hpp

src/share/vm/code/debugInfo.hpp

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1 /*
2 * Copyright (c) 1997, 2014, 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_DEBUGINFO_HPP
26 #define SHARE_VM_CODE_DEBUGINFO_HPP
27
28 #include "code/compressedStream.hpp"
29 #include "code/location.hpp"
30 #include "code/nmethod.hpp"
31 #include "code/oopRecorder.hpp"
32 #include "runtime/stackValue.hpp"
33 #include "utilities/growableArray.hpp"
34
35 // Classes used for serializing debugging information.
36 // These abstractions are introducted to provide symmetric
37 // read and write operations.
38
39 // ScopeValue describes the value of a variable/expression in a scope
40 // - LocationValue describes a value in a given location (in frame or register)
41 // - ConstantValue describes a constant
42
43 class ConstantOopReadValue;
44
45 class ScopeValue: public ResourceObj {
46 public:
47 // Testers
48 virtual bool is_location() const { return false; }
49 virtual bool is_object() const { return false; }
50 virtual bool is_constant_int() const { return false; }
51 virtual bool is_constant_double() const { return false; }
52 virtual bool is_constant_long() const { return false; }
53 virtual bool is_constant_oop() const { return false; }
54 virtual bool equals(ScopeValue* other) const { return false; }
55
56 ConstantOopReadValue* as_ConstantOopReadValue() {
57 assert(is_constant_oop(), "must be");
58 return (ConstantOopReadValue*) this;
59 }
60
61 // Serialization of debugging information
62 virtual void write_on(DebugInfoWriteStream* stream) = 0;
63 static ScopeValue* read_from(DebugInfoReadStream* stream);
64 };
65
66
67 // A Location value describes a value in a given location; i.e. the corresponding
68 // logical entity (e.g., a method temporary) lives in this location.
69
70 class LocationValue: public ScopeValue {
71 private:
72 Location _location;
73 public:
74 LocationValue(Location location) { _location = location; }
75 bool is_location() const { return true; }
76 Location location() const { return _location; }
77
78 // Serialization of debugging information
79 LocationValue(DebugInfoReadStream* stream);
80 void write_on(DebugInfoWriteStream* stream);
81
82 // Printing
83 void print_on(outputStream* st) const;
84 };
85
86
87 // An ObjectValue describes an object eliminated by escape analysis.
88
89 class ObjectValue: public ScopeValue {
90 private:
91 int _id;
92 ScopeValue* _klass;
93 GrowableArray<ScopeValue*> _field_values;
94 Handle _value;
95 bool _visited;
96
97 public:
98 ObjectValue(int id, ScopeValue* klass)
99 : _id(id)
100 , _klass(klass)
101 , _field_values()
102 , _value()
103 , _visited(false) {
104 assert(klass->is_constant_oop(), "should be constant java mirror oop");
105 }
106
107 ObjectValue(int id)
108 : _id(id)
109 , _klass(NULL)
110 , _field_values()
111 , _value()
112 , _visited(false) {}
113
114 // Accessors
115 bool is_object() const { return true; }
116 int id() const { return _id; }
117 ScopeValue* klass() const { return _klass; }
118 GrowableArray<ScopeValue*>* field_values() { return &_field_values; }
119 ScopeValue* field_at(int i) const { return _field_values.at(i); }
120 int field_size() { return _field_values.length(); }
121 Handle value() const { return _value; }
122 bool is_visited() const { return _visited; }
123
124 void set_value(oop value) { _value = Handle(value); }
125 void set_visited(bool visited) { _visited = false; }
126
127 // Serialization of debugging information
128 void read_object(DebugInfoReadStream* stream);
129 void write_on(DebugInfoWriteStream* stream);
130
131 // Printing
132 void print_on(outputStream* st) const;
133 void print_fields_on(outputStream* st) const;
134 };
135
136
137 // A ConstantIntValue describes a constant int; i.e., the corresponding logical entity
138 // is either a source constant or its computation has been constant-folded.
139
140 class ConstantIntValue: public ScopeValue {
141 private:
142 jint _value;
143 public:
144 ConstantIntValue(jint value) { _value = value; }
145 jint value() const { return _value; }
146 bool is_constant_int() const { return true; }
147 bool equals(ScopeValue* other) const { return false; }
148
149 // Serialization of debugging information
150 ConstantIntValue(DebugInfoReadStream* stream);
151 void write_on(DebugInfoWriteStream* stream);
152
153 // Printing
154 void print_on(outputStream* st) const;
155 };
156
157 class ConstantLongValue: public ScopeValue {
158 private:
159 jlong _value;
160 public:
161 ConstantLongValue(jlong value) { _value = value; }
162 jlong value() const { return _value; }
163 bool is_constant_long() const { return true; }
164 bool equals(ScopeValue* other) const { return false; }
165
166 // Serialization of debugging information
167 ConstantLongValue(DebugInfoReadStream* stream);
168 void write_on(DebugInfoWriteStream* stream);
169
170 // Printing
171 void print_on(outputStream* st) const;
172 };
173
174 class ConstantDoubleValue: public ScopeValue {
175 private:
176 jdouble _value;
177 public:
178 ConstantDoubleValue(jdouble value) { _value = value; }
179 jdouble value() const { return _value; }
180 bool is_constant_double() const { return true; }
181 bool equals(ScopeValue* other) const { return false; }
182
183 // Serialization of debugging information
184 ConstantDoubleValue(DebugInfoReadStream* stream);
185 void write_on(DebugInfoWriteStream* stream);
186
187 // Printing
188 void print_on(outputStream* st) const;
189 };
190
191 // A ConstantOopWriteValue is created by the compiler to
192 // be written as debugging information.
193
194 class ConstantOopWriteValue: public ScopeValue {
195 private:
196 jobject _value;
197 public:
198 ConstantOopWriteValue(jobject value) { _value = value; }
199 jobject value() const { return _value; }
200 bool is_constant_oop() const { return true; }
201 bool equals(ScopeValue* other) const { return false; }
202
203 // Serialization of debugging information
204 void write_on(DebugInfoWriteStream* stream);
205
206 // Printing
207 void print_on(outputStream* st) const;
208 };
209
210 // A ConstantOopReadValue is created by the VM when reading
211 // debug information
212
213 class ConstantOopReadValue: public ScopeValue {
214 private:
215 Handle _value;
216 public:
217 Handle value() const { return _value; }
218 bool is_constant_oop() const { return true; }
219 bool equals(ScopeValue* other) const { return false; }
220
221 // Serialization of debugging information
222 ConstantOopReadValue(DebugInfoReadStream* stream);
223 void write_on(DebugInfoWriteStream* stream);
224
225 // Printing
226 void print_on(outputStream* st) const;
227 };
228
229 // MonitorValue describes the pair used for monitor_enter and monitor_exit.
230
231 class MonitorValue: public ResourceObj {
232 private:
233 ScopeValue* _owner;
234 Location _basic_lock;
235 bool _eliminated;
236 public:
237 // Constructor
238 MonitorValue(ScopeValue* owner, Location basic_lock, bool eliminated = false);
239
240 // Accessors
241 ScopeValue* owner() const { return _owner; }
242 Location basic_lock() const { return _basic_lock; }
243 bool eliminated() const { return _eliminated; }
244
245 // Serialization of debugging information
246 MonitorValue(DebugInfoReadStream* stream);
247 void write_on(DebugInfoWriteStream* stream);
248
249 // Printing
250 void print_on(outputStream* st) const;
251 };
252
253 // DebugInfoReadStream specializes CompressedReadStream for reading
254 // debugging information. Used by ScopeDesc.
255
256 class DebugInfoReadStream : public CompressedReadStream {
257 private:
258 const nmethod* _code;
259 const nmethod* code() const { return _code; }
260 GrowableArray<ScopeValue*>* _obj_pool;
261 public:
262 DebugInfoReadStream(const nmethod* code, int offset, GrowableArray<ScopeValue*>* obj_pool = NULL) :
263 CompressedReadStream(code->scopes_data_begin(), offset) {
264 _code = code;
265 _obj_pool = obj_pool;
266
267 } ;
268
269 oop read_oop() {
270 oop o = code()->oop_at(read_int());
271 assert(o == NULL || o->is_oop(), "oop only");
272 return o;
273 }
274 Method* read_method() {
275 Method* o = (Method*)(code()->metadata_at(read_int()));
276 // is_metadata() is a faster check than is_metaspace_object()
277 assert(o == NULL || o->is_metadata(), "meta data only");
278 return o;
279 }
280 ScopeValue* read_object_value();
281 ScopeValue* get_cached_object();
282 // BCI encoding is mostly unsigned, but -1 is a distinguished value
283 int read_bci() { return read_int() + InvocationEntryBci; }
284 };
285
286 // DebugInfoWriteStream specializes CompressedWriteStream for
287 // writing debugging information. Used by ScopeDescRecorder.
288
289 class DebugInfoWriteStream : public CompressedWriteStream {
290 private:
291 DebugInformationRecorder* _recorder;
292 DebugInformationRecorder* recorder() const { return _recorder; }
293 public:
294 DebugInfoWriteStream(DebugInformationRecorder* recorder, int initial_size);
295 void write_handle(jobject h);
296 void write_bci(int bci) { write_int(bci - InvocationEntryBci); }
297
298 void write_metadata(Metadata* m);
299 };
300
301 #endif // SHARE_VM_CODE_DEBUGINFO_HPP

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