1 /*
2 * Copyright 1997-2008 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any 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) {
30 _code = code;
31 _decode_offset = decode_offset;
32 _objects = decode_object_values(obj_decode_offset);
33 decode_body();
34 }
35
36 ScopeDesc::ScopeDesc(const nmethod* code, int decode_offset) {
37 _code = code;
38 _decode_offset = decode_offset;
39 _objects = decode_object_values(DebugInformationRecorder::serialized_null);
40 decode_body();
41 }
42
43
44 ScopeDesc::ScopeDesc(const ScopeDesc* parent) {
45 _code = parent->_code;
46 _decode_offset = parent->_sender_decode_offset;
47 _objects = parent->_objects;
48 decode_body();
49 }
50
51
52 void ScopeDesc::decode_body() {
53 if (decode_offset() == DebugInformationRecorder::serialized_null) {
54 // This is a sentinel record, which is only relevant to
55 // approximate queries. Decode a reasonable frame.
56 _sender_decode_offset = DebugInformationRecorder::serialized_null;
57 _method = methodHandle(_code->method());
58 _bci = InvocationEntryBci;
59 _restart = false;
60 _locals_decode_offset = DebugInformationRecorder::serialized_null;
61 _expressions_decode_offset = DebugInformationRecorder::serialized_null;
62 _monitors_decode_offset = DebugInformationRecorder::serialized_null;
63 } else {
64 // decode header
65 DebugInfoReadStream* stream = stream_at(decode_offset());
66
67 _sender_decode_offset = stream->read_int();
68 _method = methodHandle((methodOop) stream->read_oop());
69 _bci = stream->read_bci_and_restart(_restart);
70 // decode offsets for body and sender
71 _locals_decode_offset = stream->read_int();
72 _expressions_decode_offset = stream->read_int();
73 _monitors_decode_offset = stream->read_int();
74 }
75 }
76
77
78 GrowableArray<ScopeValue*>* ScopeDesc::decode_scope_values(int decode_offset) {
79 if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
80 DebugInfoReadStream* stream = stream_at(decode_offset);
81 int length = stream->read_int();
82 GrowableArray<ScopeValue*>* result = new GrowableArray<ScopeValue*> (length);
83 for (int index = 0; index < length; index++) {
84 result->push(ScopeValue::read_from(stream));
85 }
86 return result;
87 }
88
89 GrowableArray<ScopeValue*>* ScopeDesc::decode_object_values(int decode_offset) {
90 if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
91 GrowableArray<ScopeValue*>* result = new GrowableArray<ScopeValue*>();
92 DebugInfoReadStream* stream = new DebugInfoReadStream(_code, decode_offset, result);
93 int length = stream->read_int();
94 for (int index = 0; index < length; index++) {
95 // Objects values are pushed to 'result' array during read so that
96 // object's fields could reference it (OBJECT_ID_CODE).
97 (void)ScopeValue::read_from(stream);
98 }
99 assert(result->length() == length, "inconsistent debug information");
100 return result;
101 }
102
103
104 GrowableArray<MonitorValue*>* ScopeDesc::decode_monitor_values(int decode_offset) {
105 if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
106 DebugInfoReadStream* stream = stream_at(decode_offset);
107 int length = stream->read_int();
108 GrowableArray<MonitorValue*>* result = new GrowableArray<MonitorValue*> (length);
109 for (int index = 0; index < length; index++) {
110 result->push(new MonitorValue(stream));
111 }
112 return result;
113 }
114
115 DebugInfoReadStream* ScopeDesc::stream_at(int decode_offset) const {
116 return new DebugInfoReadStream(_code, decode_offset, _objects);
117 }
118
119 GrowableArray<ScopeValue*>* ScopeDesc::locals() {
120 return decode_scope_values(_locals_decode_offset);
121 }
122
123 GrowableArray<ScopeValue*>* ScopeDesc::expressions() {
124 return decode_scope_values(_expressions_decode_offset);
125 }
126
127 GrowableArray<MonitorValue*>* ScopeDesc::monitors() {
128 return decode_monitor_values(_monitors_decode_offset);
129 }
130
131 GrowableArray<ScopeValue*>* ScopeDesc::objects() {
132 return _objects;
133 }
134
135 bool ScopeDesc::is_top() const {
136 return _sender_decode_offset == DebugInformationRecorder::serialized_null;
137 }
138
139 ScopeDesc* ScopeDesc::sender() const {
140 if (is_top()) return NULL;
141 return new ScopeDesc(this);
142 }
143
144
145 #ifndef PRODUCT
146
147 void ScopeDesc::print_value_on(outputStream* st) const {
148 tty->print(" ");
149 method()()->print_short_name(st);
150 int lineno = method()->line_number_from_bci(bci());
151 if (lineno != -1) {
152 st->print_cr("@%d (line %d)", bci(), lineno);
153 } else {
154 st->print_cr("@%d", bci());
155 }
156 }
157
158 void ScopeDesc::print_on(outputStream* st) const {
159 print_on(st, NULL);
160 }
161
162 void ScopeDesc::print_on(outputStream* st, PcDesc* pd) const {
163 // header
164 if (pd != NULL) {
165 tty->print_cr("ScopeDesc(pc=" PTR_FORMAT " offset=%x):", pd->real_pc(_code), pd->pc_offset());
166 }
167
168 print_value_on(st);
169 // decode offsets
170 if (WizardMode) {
171 st->print("ScopeDesc[%d]@" PTR_FORMAT " ", _decode_offset, _code->instructions_begin());
172 st->print_cr(" offset: %d", _decode_offset);
173 st->print_cr(" bci: %d", bci());
174 st->print_cr(" locals: %d", _locals_decode_offset);
175 st->print_cr(" stack: %d", _expressions_decode_offset);
176 st->print_cr(" monitor: %d", _monitors_decode_offset);
177 st->print_cr(" sender: %d", _sender_decode_offset);
178 }
179 // locals
180 { GrowableArray<ScopeValue*>* l = ((ScopeDesc*) this)->locals();
181 if (l != NULL) {
182 tty->print_cr(" Locals");
183 for (int index = 0; index < l->length(); index++) {
184 st->print(" - l%d: ", index);
185 l->at(index)->print_on(st);
186 st->cr();
187 }
188 }
189 }
190 // expressions
191 { GrowableArray<ScopeValue*>* l = ((ScopeDesc*) this)->expressions();
192 if (l != NULL) {
193 st->print_cr(" Expression stack");
194 for (int index = 0; index < l->length(); index++) {
195 st->print(" - @%d: ", index);
196 l->at(index)->print_on(st);
197 st->cr();
198 }
199 }
200 }
201 // monitors
202 { GrowableArray<MonitorValue*>* l = ((ScopeDesc*) this)->monitors();
203 if (l != NULL) {
204 st->print_cr(" Monitor stack");
205 for (int index = 0; index < l->length(); index++) {
206 st->print(" - @%d: ", index);
207 l->at(index)->print_on(st);
208 st->cr();
209 }
210 }
211 }
212
213 #ifdef COMPILER2
214 if (DoEscapeAnalysis && is_top() && _objects != NULL) {
215 tty->print_cr("Objects");
216 for (int i = 0; i < _objects->length(); i++) {
217 ObjectValue* sv = (ObjectValue*) _objects->at(i);
218 tty->print(" - %d: ", sv->id());
219 sv->print_fields_on(tty);
220 tty->cr();
221 }
222 }
223 #endif // COMPILER2
224 }
225
226 #endif
227
228 void ScopeDesc::verify() {
229 ResourceMark rm;
230 guarantee(method()->is_method(), "type check");
231
232 // check if we have any illegal elements on the expression stack
233 { GrowableArray<ScopeValue*>* l = expressions();
234 if (l != NULL) {
235 for (int index = 0; index < l->length(); index++) {
236 //guarantee(!l->at(index)->is_illegal(), "expression element cannot be illegal");
237 }
238 }
239 }
240 }