1 /*
2 * Copyright (c) 1997, 2010, 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 "incls/_precompiled.incl"
26 # include "incls/_scopeDesc.cpp.incl"
27
28
29 ScopeDesc::ScopeDesc(const nmethod* code, int decode_offset, int obj_decode_offset, bool reexecute, bool return_oop) {
30 _code = code;
31 _decode_offset = decode_offset;
32 _objects = decode_object_values(obj_decode_offset);
33 _reexecute = reexecute;
34 _return_oop = return_oop;
35 decode_body();
36 }
37
38 ScopeDesc::ScopeDesc(const nmethod* code, int decode_offset, bool reexecute, bool return_oop) {
39 _code = code;
40 _decode_offset = decode_offset;
41 _objects = decode_object_values(DebugInformationRecorder::serialized_null);
42 _reexecute = reexecute;
43 _return_oop = return_oop;
44 decode_body();
45 }
46
47
48 ScopeDesc::ScopeDesc(const ScopeDesc* parent) {
49 _code = parent->_code;
50 _decode_offset = parent->_sender_decode_offset;
51 _objects = parent->_objects;
52 _reexecute = false; //reexecute only applies to the first scope
53 _return_oop = false;
54 decode_body();
55 }
56
57
58 void ScopeDesc::decode_body() {
59 if (decode_offset() == DebugInformationRecorder::serialized_null) {
60 // This is a sentinel record, which is only relevant to
61 // approximate queries. Decode a reasonable frame.
62 _sender_decode_offset = DebugInformationRecorder::serialized_null;
63 _method = methodHandle(_code->method());
64 _bci = InvocationEntryBci;
65 _locals_decode_offset = DebugInformationRecorder::serialized_null;
66 _expressions_decode_offset = DebugInformationRecorder::serialized_null;
67 _monitors_decode_offset = DebugInformationRecorder::serialized_null;
68 } else {
69 // decode header
70 DebugInfoReadStream* stream = stream_at(decode_offset());
71
72 _sender_decode_offset = stream->read_int();
73 _method = methodHandle((methodOop) stream->read_oop());
74 _bci = stream->read_bci();
75
76 // decode offsets for body and sender
77 _locals_decode_offset = stream->read_int();
78 _expressions_decode_offset = stream->read_int();
79 _monitors_decode_offset = stream->read_int();
80 }
81 }
82
83
84 GrowableArray<ScopeValue*>* ScopeDesc::decode_scope_values(int decode_offset) {
85 if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
86 DebugInfoReadStream* stream = stream_at(decode_offset);
87 int length = stream->read_int();
88 GrowableArray<ScopeValue*>* result = new GrowableArray<ScopeValue*> (length);
89 for (int index = 0; index < length; index++) {
90 result->push(ScopeValue::read_from(stream));
91 }
92 return result;
93 }
94
95 GrowableArray<ScopeValue*>* ScopeDesc::decode_object_values(int decode_offset) {
96 if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
97 GrowableArray<ScopeValue*>* result = new GrowableArray<ScopeValue*>();
98 DebugInfoReadStream* stream = new DebugInfoReadStream(_code, decode_offset, result);
99 int length = stream->read_int();
100 for (int index = 0; index < length; index++) {
101 // Objects values are pushed to 'result' array during read so that
102 // object's fields could reference it (OBJECT_ID_CODE).
103 (void)ScopeValue::read_from(stream);
104 }
105 assert(result->length() == length, "inconsistent debug information");
106 return result;
107 }
108
109
110 GrowableArray<MonitorValue*>* ScopeDesc::decode_monitor_values(int decode_offset) {
111 if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
112 DebugInfoReadStream* stream = stream_at(decode_offset);
113 int length = stream->read_int();
114 GrowableArray<MonitorValue*>* result = new GrowableArray<MonitorValue*> (length);
115 for (int index = 0; index < length; index++) {
116 result->push(new MonitorValue(stream));
117 }
118 return result;
119 }
120
121 DebugInfoReadStream* ScopeDesc::stream_at(int decode_offset) const {
122 return new DebugInfoReadStream(_code, decode_offset, _objects);
123 }
124
125 GrowableArray<ScopeValue*>* ScopeDesc::locals() {
126 return decode_scope_values(_locals_decode_offset);
127 }
128
129 GrowableArray<ScopeValue*>* ScopeDesc::expressions() {
130 return decode_scope_values(_expressions_decode_offset);
131 }
132
133 GrowableArray<MonitorValue*>* ScopeDesc::monitors() {
134 return decode_monitor_values(_monitors_decode_offset);
135 }
136
137 GrowableArray<ScopeValue*>* ScopeDesc::objects() {
138 return _objects;
139 }
140
141 bool ScopeDesc::is_top() const {
142 return _sender_decode_offset == DebugInformationRecorder::serialized_null;
143 }
144
145 ScopeDesc* ScopeDesc::sender() const {
146 if (is_top()) return NULL;
147 return new ScopeDesc(this);
148 }
149
150
151 #ifndef PRODUCT
152
153 void ScopeDesc::print_value_on(outputStream* st) const {
154 tty->print(" ");
155 method()()->print_short_name(st);
156 int lineno = method()->line_number_from_bci(bci());
157 if (lineno != -1) {
158 st->print_cr("@%d (line %d)", bci(), lineno);
159 } else {
160 st->print_cr("@%d", bci());
161 }
162 }
163
164 void ScopeDesc::print_on(outputStream* st) const {
165 print_on(st, NULL);
166 }
167
168 void ScopeDesc::print_on(outputStream* st, PcDesc* pd) const {
169 // header
170 if (pd != NULL) {
171 tty->print_cr("ScopeDesc(pc=" PTR_FORMAT " offset=%x):", pd->real_pc(_code), pd->pc_offset());
172 }
173
174 print_value_on(st);
175 // decode offsets
176 if (WizardMode) {
177 st->print("ScopeDesc[%d]@" PTR_FORMAT " ", _decode_offset, _code->content_begin());
178 st->print_cr(" offset: %d", _decode_offset);
179 st->print_cr(" bci: %d", bci());
180 st->print_cr(" reexecute: %s", should_reexecute() ? "true" : "false");
181 st->print_cr(" locals: %d", _locals_decode_offset);
182 st->print_cr(" stack: %d", _expressions_decode_offset);
183 st->print_cr(" monitor: %d", _monitors_decode_offset);
184 st->print_cr(" sender: %d", _sender_decode_offset);
185 }
186 // locals
187 { GrowableArray<ScopeValue*>* l = ((ScopeDesc*) this)->locals();
188 if (l != NULL) {
189 tty->print_cr(" Locals");
190 for (int index = 0; index < l->length(); index++) {
191 st->print(" - l%d: ", index);
192 l->at(index)->print_on(st);
193 st->cr();
194 }
195 }
196 }
197 // expressions
198 { GrowableArray<ScopeValue*>* l = ((ScopeDesc*) this)->expressions();
199 if (l != NULL) {
200 st->print_cr(" Expression stack");
201 for (int index = 0; index < l->length(); index++) {
202 st->print(" - @%d: ", index);
203 l->at(index)->print_on(st);
204 st->cr();
205 }
206 }
207 }
208 // monitors
209 { GrowableArray<MonitorValue*>* l = ((ScopeDesc*) this)->monitors();
210 if (l != NULL) {
211 st->print_cr(" Monitor stack");
212 for (int index = 0; index < l->length(); index++) {
213 st->print(" - @%d: ", index);
214 l->at(index)->print_on(st);
215 st->cr();
216 }
217 }
218 }
219
220 #ifdef COMPILER2
221 if (DoEscapeAnalysis && is_top() && _objects != NULL) {
222 tty->print_cr("Objects");
223 for (int i = 0; i < _objects->length(); i++) {
224 ObjectValue* sv = (ObjectValue*) _objects->at(i);
225 tty->print(" - %d: ", sv->id());
226 sv->print_fields_on(tty);
227 tty->cr();
228 }
229 }
230 #endif // COMPILER2
231 }
232
233 #endif
234
235 void ScopeDesc::verify() {
236 ResourceMark rm;
237 guarantee(method()->is_method(), "type check");
238
239 // check if we have any illegal elements on the expression stack
240 { GrowableArray<ScopeValue*>* l = expressions();
241 if (l != NULL) {
242 for (int index = 0; index < l->length(); index++) {
243 //guarantee(!l->at(index)->is_illegal(), "expression element cannot be illegal");
244 }
245 }
246 }
247 }