1 /*
2 * Copyright (c) 1997, 2016, 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 #include "precompiled.hpp"
26 #include "code/debugInfoRec.hpp"
27 #include "code/pcDesc.hpp"
28 #include "code/scopeDesc.hpp"
29 #include "memory/resourceArea.hpp"
30 #include "oops/oop.inline.hpp"
31 #include "runtime/handles.inline.hpp"
32
33 ScopeDesc::ScopeDesc(const CompiledMethod* code, int decode_offset, int obj_decode_offset, bool reexecute, bool rethrow_exception, bool return_oop) {
34 _code = code;
35 _decode_offset = decode_offset;
36 _objects = decode_object_values(obj_decode_offset);
37 _reexecute = reexecute;
38 _rethrow_exception = rethrow_exception;
39 _return_oop = return_oop;
40 decode_body();
41 }
42
43 ScopeDesc::ScopeDesc(const CompiledMethod* code, int decode_offset, bool reexecute, bool rethrow_exception, bool return_oop) {
44 _code = code;
45 _decode_offset = decode_offset;
46 _objects = decode_object_values(DebugInformationRecorder::serialized_null);
47 _reexecute = reexecute;
48 _rethrow_exception = rethrow_exception;
49 _return_oop = return_oop;
50 decode_body();
51 }
52
53
54 void ScopeDesc::initialize(const ScopeDesc* parent, int decode_offset) {
55 _code = parent->_code;
56 _decode_offset = decode_offset;
57 _objects = parent->_objects;
58 _reexecute = false; //reexecute only applies to the first scope
59 _rethrow_exception = false;
60 _return_oop = false;
61 decode_body();
62 }
63
64 ScopeDesc::ScopeDesc(const ScopeDesc* parent) {
65 initialize(parent, parent->_sender_decode_offset);
66 }
67
68 ScopeDesc::ScopeDesc(const ScopeDesc* parent, int decode_offset) {
69 initialize(parent, decode_offset);
70 }
71
72
73 void ScopeDesc::decode_body() {
74 if (decode_offset() == DebugInformationRecorder::serialized_null) {
75 // This is a sentinel record, which is only relevant to
76 // approximate queries. Decode a reasonable frame.
77 _sender_decode_offset = DebugInformationRecorder::serialized_null;
78 _method = _code->method();
79 _bci = InvocationEntryBci;
80 _locals_decode_offset = DebugInformationRecorder::serialized_null;
81 _expressions_decode_offset = DebugInformationRecorder::serialized_null;
82 _monitors_decode_offset = DebugInformationRecorder::serialized_null;
83 } else {
84 // decode header
85 DebugInfoReadStream* stream = stream_at(decode_offset());
86
87 _sender_decode_offset = stream->read_int();
88 _method = stream->read_method();
89 _bci = stream->read_bci();
90
91 // decode offsets for body and sender
92 _locals_decode_offset = stream->read_int();
93 _expressions_decode_offset = stream->read_int();
94 _monitors_decode_offset = stream->read_int();
95 }
96 }
97
98
99 GrowableArray<ScopeValue*>* ScopeDesc::decode_scope_values(int decode_offset) {
100 if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
101 DebugInfoReadStream* stream = stream_at(decode_offset);
102 int length = stream->read_int();
103 GrowableArray<ScopeValue*>* result = new GrowableArray<ScopeValue*> (length);
104 for (int index = 0; index < length; index++) {
105 result->push(ScopeValue::read_from(stream));
106 }
107 return result;
108 }
109
110 GrowableArray<ScopeValue*>* ScopeDesc::decode_object_values(int decode_offset) {
111 if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
112 GrowableArray<ScopeValue*>* result = new GrowableArray<ScopeValue*>();
113 DebugInfoReadStream* stream = new DebugInfoReadStream(_code, decode_offset, result);
114 int length = stream->read_int();
115 for (int index = 0; index < length; index++) {
116 // Objects values are pushed to 'result' array during read so that
117 // object's fields could reference it (OBJECT_ID_CODE).
118 (void)ScopeValue::read_from(stream);
119 }
120 assert(result->length() == length, "inconsistent debug information");
121 return result;
122 }
123
124
125 GrowableArray<MonitorValue*>* ScopeDesc::decode_monitor_values(int decode_offset) {
126 if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
127 DebugInfoReadStream* stream = stream_at(decode_offset);
128 int length = stream->read_int();
129 GrowableArray<MonitorValue*>* result = new GrowableArray<MonitorValue*> (length);
130 for (int index = 0; index < length; index++) {
131 result->push(new MonitorValue(stream));
132 }
133 return result;
134 }
135
136 DebugInfoReadStream* ScopeDesc::stream_at(int decode_offset) const {
137 return new DebugInfoReadStream(_code, decode_offset, _objects);
138 }
139
140 GrowableArray<ScopeValue*>* ScopeDesc::locals() {
141 return decode_scope_values(_locals_decode_offset);
142 }
143
144 GrowableArray<ScopeValue*>* ScopeDesc::expressions() {
145 return decode_scope_values(_expressions_decode_offset);
146 }
147
148 GrowableArray<MonitorValue*>* ScopeDesc::monitors() {
149 return decode_monitor_values(_monitors_decode_offset);
150 }
151
152 GrowableArray<ScopeValue*>* ScopeDesc::objects() {
153 return _objects;
154 }
155
156 bool ScopeDesc::is_top() const {
157 return _sender_decode_offset == DebugInformationRecorder::serialized_null;
158 }
159
160 ScopeDesc* ScopeDesc::sender() const {
161 if (is_top()) return NULL;
162 return new ScopeDesc(this);
163 }
164
165
166 #ifndef PRODUCT
167
168 void ScopeDesc::print_value_on(outputStream* st) const {
169 st->print(" ");
170 method()->print_short_name(st);
171 int lineno = method()->line_number_from_bci(bci());
172 if (lineno != -1) {
173 st->print("@%d (line %d)", bci(), lineno);
174 } else {
175 st->print("@%d", bci());
176 }
177 if (should_reexecute()) {
178 st->print(" reexecute=true");
179 }
180 st->cr();
181 }
182
183 void ScopeDesc::print_on(outputStream* st) const {
184 print_on(st, NULL);
185 }
186
187 void ScopeDesc::print_on(outputStream* st, PcDesc* pd) const {
188 // header
189 if (pd != NULL) {
190 st->print_cr("ScopeDesc(pc=" PTR_FORMAT " offset=%x):", p2i(pd->real_pc(_code)), pd->pc_offset());
191 }
192
193 print_value_on(st);
194 // decode offsets
195 if (WizardMode) {
196 st->print("ScopeDesc[%d]@" PTR_FORMAT " ", _decode_offset, p2i(_code->content_begin()));
197 st->print_cr(" offset: %d", _decode_offset);
198 st->print_cr(" bci: %d", bci());
199 st->print_cr(" reexecute: %s", should_reexecute() ? "true" : "false");
200 st->print_cr(" locals: %d", _locals_decode_offset);
201 st->print_cr(" stack: %d", _expressions_decode_offset);
202 st->print_cr(" monitor: %d", _monitors_decode_offset);
203 st->print_cr(" sender: %d", _sender_decode_offset);
204 }
205 // locals
206 { GrowableArray<ScopeValue*>* l = ((ScopeDesc*) this)->locals();
207 if (l != NULL) {
208 st->print_cr(" Locals");
209 for (int index = 0; index < l->length(); index++) {
210 st->print(" - l%d: ", index);
211 l->at(index)->print_on(st);
212 st->cr();
213 }
214 }
215 }
216 // expressions
217 { GrowableArray<ScopeValue*>* l = ((ScopeDesc*) this)->expressions();
218 if (l != NULL) {
219 st->print_cr(" Expression stack");
220 for (int index = 0; index < l->length(); index++) {
221 st->print(" - @%d: ", index);
222 l->at(index)->print_on(st);
223 st->cr();
224 }
225 }
226 }
227 // monitors
228 { GrowableArray<MonitorValue*>* l = ((ScopeDesc*) this)->monitors();
229 if (l != NULL) {
230 st->print_cr(" Monitor stack");
231 for (int index = 0; index < l->length(); index++) {
232 st->print(" - @%d: ", index);
233 l->at(index)->print_on(st);
234 st->cr();
235 }
236 }
237 }
238
239 #if COMPILER2_OR_JVMCI
240 if (NOT_JVMCI(DoEscapeAnalysis &&) is_top() && _objects != NULL) {
241 st->print_cr(" Objects");
242 for (int i = 0; i < _objects->length(); i++) {
243 ObjectValue* sv = (ObjectValue*) _objects->at(i);
244 st->print(" - %d: ", sv->id());
245 st->print("%s ", java_lang_Class::as_Klass(sv->klass()->as_ConstantOopReadValue()->value()())->external_name());
246 sv->print_fields_on(st);
247 st->cr();
248 }
249 }
250 #endif // COMPILER2_OR_JVMCI
251 }
252
253 #endif
254
255 void ScopeDesc::verify() {
256 ResourceMark rm;
257 guarantee(method()->is_method(), "type check");
258
259 // check if we have any illegal elements on the expression stack
260 { GrowableArray<ScopeValue*>* l = expressions();
261 if (l != NULL) {
262 for (int index = 0; index < l->length(); index++) {
263 //guarantee(!l->at(index)->is_illegal(), "expression element cannot be illegal");
264 }
265 }
266 }
267 }