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/*
* Copyright (c) 1997, 2022, 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.
*
*/
#ifndef SHARE_CODE_SCOPEDESC_HPP
#define SHARE_CODE_SCOPEDESC_HPP
#include "code/debugInfo.hpp"
#include "code/pcDesc.hpp"
#include "oops/method.hpp"
#include "utilities/growableArray.hpp"
// SimpleScopeDesc is used when all you need to extract from
// a given pc,nmethod pair is a Method* and a bci. This is
// quite a bit faster than allocating a full ScopeDesc, but
// very limited in abilities.
class SimpleScopeDesc : public StackObj {
private:
Method* _method;
int _bci;
public:
SimpleScopeDesc(CompiledMethod* code, address pc) {
PcDesc* pc_desc = code->pc_desc_at(pc);
assert(pc_desc != NULL, "Must be able to find matching PcDesc");
// save this here so we only have to look up the PcDesc once
DebugInfoReadStream buffer(code, pc_desc->scope_decode_offset());
int ignore_sender = buffer.read_int();
_method = buffer.read_method();
_bci = buffer.read_bci();
}
Method* method() { return _method; }
int bci() { return _bci; }
};
// ScopeDescs contain the information that makes source-level debugging of
// nmethods possible; each scopeDesc describes a method activation
class ScopeDesc : public ResourceObj {
public:
// Constructor
ScopeDesc(const CompiledMethod* code, PcDesc* pd, bool ignore_objects = false);
// Direct access to scope
ScopeDesc* at_offset(int decode_offset) { return new ScopeDesc(this, decode_offset); }
// JVM state
Method* method() const { return _method; }
int bci() const { return _bci; }
bool should_reexecute() const { return _reexecute; }
bool rethrow_exception() const { return _rethrow_exception; }
bool return_oop() const { return _return_oop; }
// Returns true if one or more NoEscape or ArgEscape objects exist in
// any of the scopes at compiled pc.
bool has_ea_local_in_scope() const { return _has_ea_local_in_scope; }
bool arg_escape() const { return _arg_escape; }
GrowableArray<ScopeValue*>* locals();
GrowableArray<ScopeValue*>* expressions();
GrowableArray<MonitorValue*>* monitors();
GrowableArray<ScopeValue*>* objects();
// Stack walking, returns NULL if this is the outer most scope.
ScopeDesc* sender() const;
// Returns where the scope was decoded
int decode_offset() const { return _decode_offset; }
int sender_decode_offset() const { return _sender_decode_offset; }
// Tells whether sender() returns NULL
bool is_top() const;
private:
void initialize(const ScopeDesc* parent, int decode_offset);
// Alternative constructors
ScopeDesc(const ScopeDesc* parent);
ScopeDesc(const ScopeDesc* parent, int decode_offset);
// JVM state
Method* _method;
int _bci;
bool _reexecute;
bool _rethrow_exception;
bool _return_oop;
bool _has_ea_local_in_scope; // One or more NoEscape or ArgEscape objects exist in
// any of the scopes at compiled pc.
bool _arg_escape; // Compiled Java call in youngest scope passes ArgEscape
// Decoding offsets
int _decode_offset;
int _sender_decode_offset;
int _locals_decode_offset;
int _expressions_decode_offset;
int _monitors_decode_offset;
// Object pool
GrowableArray<ScopeValue*>* _objects;
// Nmethod information
const CompiledMethod* _code;
// Decoding operations
void decode_body();
GrowableArray<ScopeValue*>* decode_scope_values(int decode_offset);
GrowableArray<MonitorValue*>* decode_monitor_values(int decode_offset);
GrowableArray<ScopeValue*>* decode_object_values(int decode_offset);
DebugInfoReadStream* stream_at(int decode_offset) const;
public:
// Verification
void verify();
#ifndef PRODUCT
public:
// Printing support
void print_on(outputStream* st) const;
void print_on(outputStream* st, PcDesc* pd) const;
void print_value_on(outputStream* st) const;
#endif
};
#endif // SHARE_CODE_SCOPEDESC_HPP
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