/*
* Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
#include "code/debugInfoRec.hpp"
#include "code/pcDesc.hpp"
#include "code/scopeDesc.hpp"
#include "memory/resourceArea.hpp"
#include "oops/oop.inline.hpp"
#include "runtime/handles.inline.hpp"
ScopeDesc::ScopeDesc(const nmethod* code, int decode_offset, int obj_decode_offset, bool reexecute, bool return_oop) {
_code = code;
_decode_offset = decode_offset;
_objects = decode_object_values(obj_decode_offset);
_reexecute = reexecute;
_return_oop = return_oop;
decode_body();
}
ScopeDesc::ScopeDesc(const nmethod* code, int decode_offset, bool reexecute, bool return_oop) {
_code = code;
_decode_offset = decode_offset;
_objects = decode_object_values(DebugInformationRecorder::serialized_null);
_reexecute = reexecute;
_return_oop = return_oop;
decode_body();
}
ScopeDesc::ScopeDesc(const ScopeDesc* parent) {
_code = parent->_code;
_decode_offset = parent->_sender_decode_offset;
_objects = parent->_objects;
_reexecute = false; //reexecute only applies to the first scope
_return_oop = false;
decode_body();
}
void ScopeDesc::decode_body() {
if (decode_offset() == DebugInformationRecorder::serialized_null) {
// This is a sentinel record, which is only relevant to
// approximate queries. Decode a reasonable frame.
_sender_decode_offset = DebugInformationRecorder::serialized_null;
_method = methodHandle(_code->method());
_bci = InvocationEntryBci;
_locals_decode_offset = DebugInformationRecorder::serialized_null;
_expressions_decode_offset = DebugInformationRecorder::serialized_null;
_monitors_decode_offset = DebugInformationRecorder::serialized_null;
} else {
// decode header
DebugInfoReadStream* stream = stream_at(decode_offset());
_sender_decode_offset = stream->read_int();
_method = methodHandle((methodOop) stream->read_oop());
_bci = stream->read_bci();
// decode offsets for body and sender
_locals_decode_offset = stream->read_int();
_expressions_decode_offset = stream->read_int();
_monitors_decode_offset = stream->read_int();
}
}
GrowableArray<ScopeValue*>* ScopeDesc::decode_scope_values(int decode_offset) {
if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
DebugInfoReadStream* stream = stream_at(decode_offset);
int length = stream->read_int();
GrowableArray<ScopeValue*>* result = new GrowableArray<ScopeValue*> (length);
for (int index = 0; index < length; index++) {
result->push(ScopeValue::read_from(stream));
}
return result;
}
GrowableArray<ScopeValue*>* ScopeDesc::decode_object_values(int decode_offset) {
if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
GrowableArray<ScopeValue*>* result = new GrowableArray<ScopeValue*>();
DebugInfoReadStream* stream = new DebugInfoReadStream(_code, decode_offset, result);
int length = stream->read_int();
for (int index = 0; index < length; index++) {
// Objects values are pushed to 'result' array during read so that
// object's fields could reference it (OBJECT_ID_CODE).
(void)ScopeValue::read_from(stream);
}
assert(result->length() == length, "inconsistent debug information");
return result;
}
GrowableArray<MonitorValue*>* ScopeDesc::decode_monitor_values(int decode_offset) {
if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
DebugInfoReadStream* stream = stream_at(decode_offset);
int length = stream->read_int();
GrowableArray<MonitorValue*>* result = new GrowableArray<MonitorValue*> (length);
for (int index = 0; index < length; index++) {
result->push(new MonitorValue(stream));
}
return result;
}
DebugInfoReadStream* ScopeDesc::stream_at(int decode_offset) const {
return new DebugInfoReadStream(_code, decode_offset, _objects);
}
GrowableArray<ScopeValue*>* ScopeDesc::locals() {
return decode_scope_values(_locals_decode_offset);
}
GrowableArray<ScopeValue*>* ScopeDesc::expressions() {
return decode_scope_values(_expressions_decode_offset);
}
GrowableArray<MonitorValue*>* ScopeDesc::monitors() {
return decode_monitor_values(_monitors_decode_offset);
}
GrowableArray<ScopeValue*>* ScopeDesc::objects() {
return _objects;
}
bool ScopeDesc::is_top() const {
return _sender_decode_offset == DebugInformationRecorder::serialized_null;
}
ScopeDesc* ScopeDesc::sender() const {
if (is_top()) return NULL;
return new ScopeDesc(this);
}
#ifndef PRODUCT
void ScopeDesc::print_value_on(outputStream* st) const {
tty->print(" ");
method()()->print_short_name(st);
int lineno = method()->line_number_from_bci(bci());
if (lineno != -1) {
st->print_cr("@%d (line %d)", bci(), lineno);
} else {
st->print_cr("@%d", bci());
}
}
void ScopeDesc::print_on(outputStream* st) const {
print_on(st, NULL);
}
void ScopeDesc::print_on(outputStream* st, PcDesc* pd) const {
// header
if (pd != NULL) {
tty->print_cr("ScopeDesc(pc=" PTR_FORMAT " offset=%x):", pd->real_pc(_code), pd->pc_offset());
}
print_value_on(st);
// decode offsets
if (WizardMode) {
st->print("ScopeDesc[%d]@" PTR_FORMAT " ", _decode_offset, _code->content_begin());
st->print_cr(" offset: %d", _decode_offset);
st->print_cr(" bci: %d", bci());
st->print_cr(" reexecute: %s", should_reexecute() ? "true" : "false");
st->print_cr(" locals: %d", _locals_decode_offset);
st->print_cr(" stack: %d", _expressions_decode_offset);
st->print_cr(" monitor: %d", _monitors_decode_offset);
st->print_cr(" sender: %d", _sender_decode_offset);
}
// locals
{ GrowableArray<ScopeValue*>* l = ((ScopeDesc*) this)->locals();
if (l != NULL) {
tty->print_cr(" Locals");
for (int index = 0; index < l->length(); index++) {
st->print(" - l%d: ", index);
l->at(index)->print_on(st);
st->cr();
}
}
}
// expressions
{ GrowableArray<ScopeValue*>* l = ((ScopeDesc*) this)->expressions();
if (l != NULL) {
st->print_cr(" Expression stack");
for (int index = 0; index < l->length(); index++) {
st->print(" - @%d: ", index);
l->at(index)->print_on(st);
st->cr();
}
}
}
// monitors
{ GrowableArray<MonitorValue*>* l = ((ScopeDesc*) this)->monitors();
if (l != NULL) {
st->print_cr(" Monitor stack");
for (int index = 0; index < l->length(); index++) {
st->print(" - @%d: ", index);
l->at(index)->print_on(st);
st->cr();
}
}
}
#ifdef COMPILER2
if (DoEscapeAnalysis && is_top() && _objects != NULL) {
tty->print_cr("Objects");
for (int i = 0; i < _objects->length(); i++) {
ObjectValue* sv = (ObjectValue*) _objects->at(i);
tty->print(" - %d: ", sv->id());
sv->print_fields_on(tty);
tty->cr();
}
}
#endif // COMPILER2
}
#endif
void ScopeDesc::verify() {
ResourceMark rm;
guarantee(method()->is_method(), "type check");
// check if we have any illegal elements on the expression stack
{ GrowableArray<ScopeValue*>* l = expressions();
if (l != NULL) {
for (int index = 0; index < l->length(); index++) {
//guarantee(!l->at(index)->is_illegal(), "expression element cannot be illegal");
}
}
}
}