1 /*
2 * Copyright 1997-2009 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, bool reexecute) {
30 _code = code;
31 _decode_offset = decode_offset;
32 _objects = decode_object_values(obj_decode_offset);
33 _reexecute = reexecute;
34 decode_body();
35 }
36
37 ScopeDesc::ScopeDesc(const nmethod* code, int decode_offset, bool reexecute) {
38 _code = code;
39 _decode_offset = decode_offset;
40 _objects = decode_object_values(DebugInformationRecorder::serialized_null);
41 _reexecute = reexecute;
42 decode_body();
43 }
44
45
46 ScopeDesc::ScopeDesc(const ScopeDesc* parent) {
47 _code = parent->_code;
48 _decode_offset = parent->_sender_decode_offset;
49 _objects = parent->_objects;
50 _reexecute = false; //reexecute only applies to the first scope
51 decode_body();
52 }
53
54
55 void ScopeDesc::decode_body() {
56 if (decode_offset() == DebugInformationRecorder::serialized_null) {
57 // This is a sentinel record, which is only relevant to
58 // approximate queries. Decode a reasonable frame.
59 _sender_decode_offset = DebugInformationRecorder::serialized_null;
60 _method = methodHandle(_code->method());
61 _bci = InvocationEntryBci;
62 _locals_decode_offset = DebugInformationRecorder::serialized_null;
63 _expressions_decode_offset = DebugInformationRecorder::serialized_null;
64 _monitors_decode_offset = DebugInformationRecorder::serialized_null;
65 } else {
66 // decode header
67 DebugInfoReadStream* stream = stream_at(decode_offset());
68
69 _sender_decode_offset = stream->read_int();
70 _method = methodHandle((methodOop) stream->read_oop());
71 _bci = stream->read_bci();
72
73 // decode offsets for body and sender
74 _locals_decode_offset = stream->read_int();
75 _expressions_decode_offset = stream->read_int();
76 _monitors_decode_offset = stream->read_int();
77 }
78 }
79
80
81 GrowableArray<ScopeValue*>* ScopeDesc::decode_scope_values(int decode_offset) {
82 if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
83 DebugInfoReadStream* stream = stream_at(decode_offset);
84 int length = stream->read_int();
85 GrowableArray<ScopeValue*>* result = new GrowableArray<ScopeValue*> (length);
86 for (int index = 0; index < length; index++) {
87 result->push(ScopeValue::read_from(stream));
88 }
89 return result;
90 }
91
92 GrowableArray<ScopeValue*>* ScopeDesc::decode_object_values(int decode_offset) {
93 if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
94 GrowableArray<ScopeValue*>* result = new GrowableArray<ScopeValue*>();
95 DebugInfoReadStream* stream = new DebugInfoReadStream(_code, decode_offset, result);
96 int length = stream->read_int();
97 for (int index = 0; index < length; index++) {
98 // Objects values are pushed to 'result' array during read so that
99 // object's fields could reference it (OBJECT_ID_CODE).
100 (void)ScopeValue::read_from(stream);
101 }
102 assert(result->length() == length, "inconsistent debug information");
103 return result;
104 }
105
106
107 GrowableArray<MonitorValue*>* ScopeDesc::decode_monitor_values(int decode_offset) {
108 if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
109 DebugInfoReadStream* stream = stream_at(decode_offset);
110 int length = stream->read_int();
111 GrowableArray<MonitorValue*>* result = new GrowableArray<MonitorValue*> (length);
112 for (int index = 0; index < length; index++) {
113 result->push(new MonitorValue(stream));
114 }
115 return result;
116 }
117
118 DebugInfoReadStream* ScopeDesc::stream_at(int decode_offset) const {
119 return new DebugInfoReadStream(_code, decode_offset, _objects);
120 }
121
122 GrowableArray<ScopeValue*>* ScopeDesc::locals() {
123 return decode_scope_values(_locals_decode_offset);
124 }
125
126 GrowableArray<ScopeValue*>* ScopeDesc::expressions() {
127 return decode_scope_values(_expressions_decode_offset);
128 }
129
130 GrowableArray<MonitorValue*>* ScopeDesc::monitors() {
131 return decode_monitor_values(_monitors_decode_offset);
132 }
133
134 GrowableArray<ScopeValue*>* ScopeDesc::objects() {
135 return _objects;
136 }
137
138 bool ScopeDesc::is_top() const {
139 return _sender_decode_offset == DebugInformationRecorder::serialized_null;
140 }
141
142 ScopeDesc* ScopeDesc::sender() const {
143 if (is_top()) return NULL;
144 return new ScopeDesc(this);
145 }
146
147
148 #ifndef PRODUCT
149
150 void ScopeDesc::print_value_on(outputStream* st) const {
151 tty->print(" ");
152 method()()->print_short_name(st);
153 int lineno = method()->line_number_from_bci(bci());
154 if (lineno != -1) {
155 st->print_cr("@%d (line %d)", bci(), lineno);
156 } else {
157 st->print_cr("@%d", bci());
158 }
159 }
160
161 void ScopeDesc::print_on(outputStream* st) const {
162 print_on(st, NULL);
163 }
164
165 void ScopeDesc::print_on(outputStream* st, PcDesc* pd) const {
166 // header
167 if (pd != NULL) {
168 tty->print_cr("ScopeDesc(pc=" PTR_FORMAT " offset=%x):", pd->real_pc(_code), pd->pc_offset());
169 }
170
171 print_value_on(st);
172 // decode offsets
173 if (WizardMode) {
174 st->print("ScopeDesc[%d]@" PTR_FORMAT " ", _decode_offset, _code->instructions_begin());
175 st->print_cr(" offset: %d", _decode_offset);
176 st->print_cr(" bci: %d", bci());
177 st->print_cr(" reexecute: %s", should_reexecute() ? "true" : "false");
178 st->print_cr(" locals: %d", _locals_decode_offset);
179 st->print_cr(" stack: %d", _expressions_decode_offset);
180 st->print_cr(" monitor: %d", _monitors_decode_offset);
181 st->print_cr(" sender: %d", _sender_decode_offset);
182 }
183 // locals
184 { GrowableArray<ScopeValue*>* l = ((ScopeDesc*) this)->locals();
185 if (l != NULL) {
186 tty->print_cr(" Locals");
187 for (int index = 0; index < l->length(); index++) {
188 st->print(" - l%d: ", index);
189 l->at(index)->print_on(st);
190 st->cr();
191 }
192 }
193 }
194 // expressions
195 { GrowableArray<ScopeValue*>* l = ((ScopeDesc*) this)->expressions();
196 if (l != NULL) {
197 st->print_cr(" Expression stack");
198 for (int index = 0; index < l->length(); index++) {
199 st->print(" - @%d: ", index);
200 l->at(index)->print_on(st);
201 st->cr();
202 }
203 }
204 }
205 // monitors
206 { GrowableArray<MonitorValue*>* l = ((ScopeDesc*) this)->monitors();
207 if (l != NULL) {
208 st->print_cr(" Monitor stack");
209 for (int index = 0; index < l->length(); index++) {
210 st->print(" - @%d: ", index);
211 l->at(index)->print_on(st);
212 st->cr();
213 }
214 }
215 }
216
217 #ifdef COMPILER2
218 if (DoEscapeAnalysis && is_top() && _objects != NULL) {
219 tty->print_cr("Objects");
220 for (int i = 0; i < _objects->length(); i++) {
221 ObjectValue* sv = (ObjectValue*) _objects->at(i);
222 tty->print(" - %d: ", sv->id());
223 sv->print_fields_on(tty);
224 tty->cr();
225 }
226 }
227 #endif // COMPILER2
228 }
229
230 #endif
231
232 void ScopeDesc::verify() {
233 ResourceMark rm;
234 guarantee(method()->is_method(), "type check");
235
236 // check if we have any illegal elements on the expression stack
237 { GrowableArray<ScopeValue*>* l = expressions();
238 if (l != NULL) {
239 for (int index = 0; index < l->length(); index++) {
240 //guarantee(!l->at(index)->is_illegal(), "expression element cannot be illegal");
241 }
242 }
243 }
244 }