Fri, 31 Jul 2009 17:12:33 -0700
6833129: specjvm98 fails with NullPointerException in the compiler with -XX:DeoptimizeALot
Summary: developed a reexecute logic for the interpreter to reexecute the bytecode when deopt happens
Reviewed-by: kvn, never, jrose, twisti
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 */
25 # include "incls/_precompiled.incl"
26 # include "incls/_scopeDesc.cpp.incl"
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 }
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 }
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 assert(_reexecute == false, "reexecute not allowed");
50 }
53 void ScopeDesc::decode_body() {
54 if (decode_offset() == DebugInformationRecorder::serialized_null) {
55 // This is a sentinel record, which is only relevant to
56 // approximate queries. Decode a reasonable frame.
57 _sender_decode_offset = DebugInformationRecorder::serialized_null;
58 _method = methodHandle(_code->method());
59 _bci = InvocationEntryBci;
60 _reexecute = false;
61 _locals_decode_offset = DebugInformationRecorder::serialized_null;
62 _expressions_decode_offset = DebugInformationRecorder::serialized_null;
63 _monitors_decode_offset = DebugInformationRecorder::serialized_null;
64 } else {
65 // decode header
66 DebugInfoReadStream* stream = stream_at(decode_offset());
68 _sender_decode_offset = stream->read_int();
69 _method = methodHandle((methodOop) stream->read_oop());
70 _bci = stream->read_bci_and_reexecute(_reexecute);
72 // decode offsets for body and sender
73 _locals_decode_offset = stream->read_int();
74 _expressions_decode_offset = stream->read_int();
75 _monitors_decode_offset = stream->read_int();
76 }
77 }
80 GrowableArray<ScopeValue*>* ScopeDesc::decode_scope_values(int decode_offset) {
81 if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
82 DebugInfoReadStream* stream = stream_at(decode_offset);
83 int length = stream->read_int();
84 GrowableArray<ScopeValue*>* result = new GrowableArray<ScopeValue*> (length);
85 for (int index = 0; index < length; index++) {
86 result->push(ScopeValue::read_from(stream));
87 }
88 return result;
89 }
91 GrowableArray<ScopeValue*>* ScopeDesc::decode_object_values(int decode_offset) {
92 if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
93 GrowableArray<ScopeValue*>* result = new GrowableArray<ScopeValue*>();
94 DebugInfoReadStream* stream = new DebugInfoReadStream(_code, decode_offset, result);
95 int length = stream->read_int();
96 for (int index = 0; index < length; index++) {
97 // Objects values are pushed to 'result' array during read so that
98 // object's fields could reference it (OBJECT_ID_CODE).
99 (void)ScopeValue::read_from(stream);
100 }
101 assert(result->length() == length, "inconsistent debug information");
102 return result;
103 }
106 GrowableArray<MonitorValue*>* ScopeDesc::decode_monitor_values(int decode_offset) {
107 if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
108 DebugInfoReadStream* stream = stream_at(decode_offset);
109 int length = stream->read_int();
110 GrowableArray<MonitorValue*>* result = new GrowableArray<MonitorValue*> (length);
111 for (int index = 0; index < length; index++) {
112 result->push(new MonitorValue(stream));
113 }
114 return result;
115 }
117 DebugInfoReadStream* ScopeDesc::stream_at(int decode_offset) const {
118 return new DebugInfoReadStream(_code, decode_offset, _objects);
119 }
121 GrowableArray<ScopeValue*>* ScopeDesc::locals() {
122 return decode_scope_values(_locals_decode_offset);
123 }
125 GrowableArray<ScopeValue*>* ScopeDesc::expressions() {
126 return decode_scope_values(_expressions_decode_offset);
127 }
129 GrowableArray<MonitorValue*>* ScopeDesc::monitors() {
130 return decode_monitor_values(_monitors_decode_offset);
131 }
133 GrowableArray<ScopeValue*>* ScopeDesc::objects() {
134 return _objects;
135 }
137 bool ScopeDesc::is_top() const {
138 return _sender_decode_offset == DebugInformationRecorder::serialized_null;
139 }
141 ScopeDesc* ScopeDesc::sender() const {
142 if (is_top()) return NULL;
143 return new ScopeDesc(this);
144 }
147 #ifndef PRODUCT
149 void ScopeDesc::print_value_on(outputStream* st) const {
150 tty->print(" ");
151 method()()->print_short_name(st);
152 int lineno = method()->line_number_from_bci(bci());
153 if (lineno != -1) {
154 st->print_cr("@%d (line %d)", bci(), lineno);
155 } else {
156 st->print_cr("@%d", bci());
157 }
158 }
160 void ScopeDesc::print_on(outputStream* st) const {
161 print_on(st, NULL);
162 }
164 void ScopeDesc::print_on(outputStream* st, PcDesc* pd) const {
165 // header
166 if (pd != NULL) {
167 tty->print_cr("ScopeDesc(pc=" PTR_FORMAT " offset=%x):", pd->real_pc(_code), pd->pc_offset());
168 }
170 print_value_on(st);
171 // decode offsets
172 if (WizardMode) {
173 st->print("ScopeDesc[%d]@" PTR_FORMAT " ", _decode_offset, _code->instructions_begin());
174 st->print_cr(" offset: %d", _decode_offset);
175 st->print_cr(" bci: %d", bci());
176 st->print_cr(" reexecute: %s", should_reexecute() ? "true" : "false");
177 st->print_cr(" locals: %d", _locals_decode_offset);
178 st->print_cr(" stack: %d", _expressions_decode_offset);
179 st->print_cr(" monitor: %d", _monitors_decode_offset);
180 st->print_cr(" sender: %d", _sender_decode_offset);
181 }
182 // locals
183 { GrowableArray<ScopeValue*>* l = ((ScopeDesc*) this)->locals();
184 if (l != NULL) {
185 tty->print_cr(" Locals");
186 for (int index = 0; index < l->length(); index++) {
187 st->print(" - l%d: ", index);
188 l->at(index)->print_on(st);
189 st->cr();
190 }
191 }
192 }
193 // expressions
194 { GrowableArray<ScopeValue*>* l = ((ScopeDesc*) this)->expressions();
195 if (l != NULL) {
196 st->print_cr(" Expression stack");
197 for (int index = 0; index < l->length(); index++) {
198 st->print(" - @%d: ", index);
199 l->at(index)->print_on(st);
200 st->cr();
201 }
202 }
203 }
204 // monitors
205 { GrowableArray<MonitorValue*>* l = ((ScopeDesc*) this)->monitors();
206 if (l != NULL) {
207 st->print_cr(" Monitor stack");
208 for (int index = 0; index < l->length(); index++) {
209 st->print(" - @%d: ", index);
210 l->at(index)->print_on(st);
211 st->cr();
212 }
213 }
214 }
216 #ifdef COMPILER2
217 if (DoEscapeAnalysis && is_top() && _objects != NULL) {
218 tty->print_cr("Objects");
219 for (int i = 0; i < _objects->length(); i++) {
220 ObjectValue* sv = (ObjectValue*) _objects->at(i);
221 tty->print(" - %d: ", sv->id());
222 sv->print_fields_on(tty);
223 tty->cr();
224 }
225 }
226 #endif // COMPILER2
227 }
229 #endif
231 void ScopeDesc::verify() {
232 ResourceMark rm;
233 guarantee(method()->is_method(), "type check");
235 // check if we have any illegal elements on the expression stack
236 { GrowableArray<ScopeValue*>* l = expressions();
237 if (l != NULL) {
238 for (int index = 0; index < l->length(); index++) {
239 //guarantee(!l->at(index)->is_illegal(), "expression element cannot be illegal");
240 }
241 }
242 }
243 }