1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/code/scopeDesc.cpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,253 @@
1.4 +/*
1.5 + * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#include "code/debugInfoRec.hpp"
1.30 +#include "code/pcDesc.hpp"
1.31 +#include "code/scopeDesc.hpp"
1.32 +#include "memory/resourceArea.hpp"
1.33 +#include "oops/oop.inline.hpp"
1.34 +#include "runtime/handles.inline.hpp"
1.35 +
1.36 +PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
1.37 +
1.38 +ScopeDesc::ScopeDesc(const nmethod* code, int decode_offset, int obj_decode_offset, bool reexecute, bool return_oop) {
1.39 + _code = code;
1.40 + _decode_offset = decode_offset;
1.41 + _objects = decode_object_values(obj_decode_offset);
1.42 + _reexecute = reexecute;
1.43 + _return_oop = return_oop;
1.44 + decode_body();
1.45 +}
1.46 +
1.47 +ScopeDesc::ScopeDesc(const nmethod* code, int decode_offset, bool reexecute, bool return_oop) {
1.48 + _code = code;
1.49 + _decode_offset = decode_offset;
1.50 + _objects = decode_object_values(DebugInformationRecorder::serialized_null);
1.51 + _reexecute = reexecute;
1.52 + _return_oop = return_oop;
1.53 + decode_body();
1.54 +}
1.55 +
1.56 +
1.57 +ScopeDesc::ScopeDesc(const ScopeDesc* parent) {
1.58 + _code = parent->_code;
1.59 + _decode_offset = parent->_sender_decode_offset;
1.60 + _objects = parent->_objects;
1.61 + _reexecute = false; //reexecute only applies to the first scope
1.62 + _return_oop = false;
1.63 + decode_body();
1.64 +}
1.65 +
1.66 +
1.67 +void ScopeDesc::decode_body() {
1.68 + if (decode_offset() == DebugInformationRecorder::serialized_null) {
1.69 + // This is a sentinel record, which is only relevant to
1.70 + // approximate queries. Decode a reasonable frame.
1.71 + _sender_decode_offset = DebugInformationRecorder::serialized_null;
1.72 + _method = _code->method();
1.73 + _bci = InvocationEntryBci;
1.74 + _locals_decode_offset = DebugInformationRecorder::serialized_null;
1.75 + _expressions_decode_offset = DebugInformationRecorder::serialized_null;
1.76 + _monitors_decode_offset = DebugInformationRecorder::serialized_null;
1.77 + } else {
1.78 + // decode header
1.79 + DebugInfoReadStream* stream = stream_at(decode_offset());
1.80 +
1.81 + _sender_decode_offset = stream->read_int();
1.82 + _method = stream->read_method();
1.83 + _bci = stream->read_bci();
1.84 +
1.85 + // decode offsets for body and sender
1.86 + _locals_decode_offset = stream->read_int();
1.87 + _expressions_decode_offset = stream->read_int();
1.88 + _monitors_decode_offset = stream->read_int();
1.89 + }
1.90 +}
1.91 +
1.92 +
1.93 +GrowableArray<ScopeValue*>* ScopeDesc::decode_scope_values(int decode_offset) {
1.94 + if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
1.95 + DebugInfoReadStream* stream = stream_at(decode_offset);
1.96 + int length = stream->read_int();
1.97 + GrowableArray<ScopeValue*>* result = new GrowableArray<ScopeValue*> (length);
1.98 + for (int index = 0; index < length; index++) {
1.99 + result->push(ScopeValue::read_from(stream));
1.100 + }
1.101 + return result;
1.102 +}
1.103 +
1.104 +GrowableArray<ScopeValue*>* ScopeDesc::decode_object_values(int decode_offset) {
1.105 + if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
1.106 + GrowableArray<ScopeValue*>* result = new GrowableArray<ScopeValue*>();
1.107 + DebugInfoReadStream* stream = new DebugInfoReadStream(_code, decode_offset, result);
1.108 + int length = stream->read_int();
1.109 + for (int index = 0; index < length; index++) {
1.110 + // Objects values are pushed to 'result' array during read so that
1.111 + // object's fields could reference it (OBJECT_ID_CODE).
1.112 + (void)ScopeValue::read_from(stream);
1.113 + }
1.114 + assert(result->length() == length, "inconsistent debug information");
1.115 + return result;
1.116 +}
1.117 +
1.118 +
1.119 +GrowableArray<MonitorValue*>* ScopeDesc::decode_monitor_values(int decode_offset) {
1.120 + if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
1.121 + DebugInfoReadStream* stream = stream_at(decode_offset);
1.122 + int length = stream->read_int();
1.123 + GrowableArray<MonitorValue*>* result = new GrowableArray<MonitorValue*> (length);
1.124 + for (int index = 0; index < length; index++) {
1.125 + result->push(new MonitorValue(stream));
1.126 + }
1.127 + return result;
1.128 +}
1.129 +
1.130 +DebugInfoReadStream* ScopeDesc::stream_at(int decode_offset) const {
1.131 + return new DebugInfoReadStream(_code, decode_offset, _objects);
1.132 +}
1.133 +
1.134 +GrowableArray<ScopeValue*>* ScopeDesc::locals() {
1.135 + return decode_scope_values(_locals_decode_offset);
1.136 +}
1.137 +
1.138 +GrowableArray<ScopeValue*>* ScopeDesc::expressions() {
1.139 + return decode_scope_values(_expressions_decode_offset);
1.140 +}
1.141 +
1.142 +GrowableArray<MonitorValue*>* ScopeDesc::monitors() {
1.143 + return decode_monitor_values(_monitors_decode_offset);
1.144 +}
1.145 +
1.146 +GrowableArray<ScopeValue*>* ScopeDesc::objects() {
1.147 + return _objects;
1.148 +}
1.149 +
1.150 +bool ScopeDesc::is_top() const {
1.151 + return _sender_decode_offset == DebugInformationRecorder::serialized_null;
1.152 +}
1.153 +
1.154 +ScopeDesc* ScopeDesc::sender() const {
1.155 + if (is_top()) return NULL;
1.156 + return new ScopeDesc(this);
1.157 +}
1.158 +
1.159 +
1.160 +#ifndef PRODUCT
1.161 +
1.162 +void ScopeDesc::print_value_on(outputStream* st) const {
1.163 + tty->print(" ");
1.164 + method()->print_short_name(st);
1.165 + int lineno = method()->line_number_from_bci(bci());
1.166 + if (lineno != -1) {
1.167 + st->print_cr("@%d (line %d)", bci(), lineno);
1.168 + } else {
1.169 + st->print_cr("@%d", bci());
1.170 + }
1.171 +}
1.172 +
1.173 +void ScopeDesc::print_on(outputStream* st) const {
1.174 + print_on(st, NULL);
1.175 +}
1.176 +
1.177 +void ScopeDesc::print_on(outputStream* st, PcDesc* pd) const {
1.178 + // header
1.179 + if (pd != NULL) {
1.180 + tty->print_cr("ScopeDesc(pc=" PTR_FORMAT " offset=%x):", pd->real_pc(_code), pd->pc_offset());
1.181 + }
1.182 +
1.183 + print_value_on(st);
1.184 + // decode offsets
1.185 + if (WizardMode) {
1.186 + st->print("ScopeDesc[%d]@" PTR_FORMAT " ", _decode_offset, _code->content_begin());
1.187 + st->print_cr(" offset: %d", _decode_offset);
1.188 + st->print_cr(" bci: %d", bci());
1.189 + st->print_cr(" reexecute: %s", should_reexecute() ? "true" : "false");
1.190 + st->print_cr(" locals: %d", _locals_decode_offset);
1.191 + st->print_cr(" stack: %d", _expressions_decode_offset);
1.192 + st->print_cr(" monitor: %d", _monitors_decode_offset);
1.193 + st->print_cr(" sender: %d", _sender_decode_offset);
1.194 + }
1.195 + // locals
1.196 + { GrowableArray<ScopeValue*>* l = ((ScopeDesc*) this)->locals();
1.197 + if (l != NULL) {
1.198 + tty->print_cr(" Locals");
1.199 + for (int index = 0; index < l->length(); index++) {
1.200 + st->print(" - l%d: ", index);
1.201 + l->at(index)->print_on(st);
1.202 + st->cr();
1.203 + }
1.204 + }
1.205 + }
1.206 + // expressions
1.207 + { GrowableArray<ScopeValue*>* l = ((ScopeDesc*) this)->expressions();
1.208 + if (l != NULL) {
1.209 + st->print_cr(" Expression stack");
1.210 + for (int index = 0; index < l->length(); index++) {
1.211 + st->print(" - @%d: ", index);
1.212 + l->at(index)->print_on(st);
1.213 + st->cr();
1.214 + }
1.215 + }
1.216 + }
1.217 + // monitors
1.218 + { GrowableArray<MonitorValue*>* l = ((ScopeDesc*) this)->monitors();
1.219 + if (l != NULL) {
1.220 + st->print_cr(" Monitor stack");
1.221 + for (int index = 0; index < l->length(); index++) {
1.222 + st->print(" - @%d: ", index);
1.223 + l->at(index)->print_on(st);
1.224 + st->cr();
1.225 + }
1.226 + }
1.227 + }
1.228 +
1.229 +#ifdef COMPILER2
1.230 + if (DoEscapeAnalysis && is_top() && _objects != NULL) {
1.231 + tty->print_cr("Objects");
1.232 + for (int i = 0; i < _objects->length(); i++) {
1.233 + ObjectValue* sv = (ObjectValue*) _objects->at(i);
1.234 + tty->print(" - %d: ", sv->id());
1.235 + sv->print_fields_on(tty);
1.236 + tty->cr();
1.237 + }
1.238 + }
1.239 +#endif // COMPILER2
1.240 +}
1.241 +
1.242 +#endif
1.243 +
1.244 +void ScopeDesc::verify() {
1.245 + ResourceMark rm;
1.246 + guarantee(method()->is_method(), "type check");
1.247 +
1.248 + // check if we have any illegal elements on the expression stack
1.249 + { GrowableArray<ScopeValue*>* l = expressions();
1.250 + if (l != NULL) {
1.251 + for (int index = 0; index < l->length(); index++) {
1.252 + //guarantee(!l->at(index)->is_illegal(), "expression element cannot be illegal");
1.253 + }
1.254 + }
1.255 + }
1.256 +}
