src/hotspot/share/code/scopeDesc.hpp
author erikj
Tue, 12 Sep 2017 19:03:39 +0200
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/*
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 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_CODE_SCOPEDESC_HPP
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#define SHARE_VM_CODE_SCOPEDESC_HPP
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#include "code/debugInfo.hpp"
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#include "code/pcDesc.hpp"
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#include "oops/method.hpp"
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#include "utilities/growableArray.hpp"
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// SimpleScopeDesc is used when all you need to extract from
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// a given pc,nmethod pair is a Method* and a bci. This is
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// quite a bit faster than allocating a full ScopeDesc, but
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// very limited in abilities.
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class SimpleScopeDesc : public StackObj {
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  Method* _method;
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  int _bci;
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 public:
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  SimpleScopeDesc(CompiledMethod* code, address pc) {
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    PcDesc* pc_desc = code->pc_desc_at(pc);
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    assert(pc_desc != NULL, "Must be able to find matching PcDesc");
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    DebugInfoReadStream buffer(code, pc_desc->scope_decode_offset());
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    int ignore_sender = buffer.read_int();
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    _method           = buffer.read_method();
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    _bci              = buffer.read_bci();
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  }
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  Method* method() { return _method; }
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  int bci() { return _bci; }
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};
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// ScopeDescs contain the information that makes source-level debugging of
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// nmethods possible; each scopeDesc describes a method activation
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class ScopeDesc : public ResourceObj {
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  // Constructor
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  ScopeDesc(const CompiledMethod* code, int decode_offset, int obj_decode_offset, bool reexecute, bool rethrow_exception, bool return_oop);
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  // Calls above, giving default value of "serialized_null" to the
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  // "obj_decode_offset" argument.  (We don't use a default argument to
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  // avoid a .hpp-.hpp dependency.)
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  ScopeDesc(const CompiledMethod* code, int decode_offset, bool reexecute, bool rethrow_exception, bool return_oop);
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  // JVM state
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  Method* method()      const { return _method; }
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  int          bci()      const { return _bci;    }
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  bool should_reexecute() const { return _reexecute; }
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  bool rethrow_exception() const { return _rethrow_exception; }
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  bool return_oop()       const { return _return_oop; }
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  GrowableArray<ScopeValue*>*   locals();
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  GrowableArray<ScopeValue*>*   expressions();
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  GrowableArray<MonitorValue*>* monitors();
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  GrowableArray<ScopeValue*>*   objects();
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  // Stack walking, returns NULL if this is the outer most scope.
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  ScopeDesc* sender() const;
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  // Returns where the scope was decoded
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  int decode_offset() const { return _decode_offset; }
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  // Tells whether sender() returns NULL
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  bool is_top() const;
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  // Alternative constructor
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  ScopeDesc(const ScopeDesc* parent);
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  // JVM state
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  Method*       _method;
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  int           _bci;
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  bool          _reexecute;
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  bool          _rethrow_exception;
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  bool          _return_oop;
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  // Decoding offsets
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  int _decode_offset;
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  int _sender_decode_offset;
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  int _locals_decode_offset;
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  int _expressions_decode_offset;
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  int _monitors_decode_offset;
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  // Object pool
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  GrowableArray<ScopeValue*>* _objects;
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  // Nmethod information
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  const CompiledMethod* _code;
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  // Decoding operations
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  void decode_body();
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  GrowableArray<ScopeValue*>* decode_scope_values(int decode_offset);
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  GrowableArray<MonitorValue*>* decode_monitor_values(int decode_offset);
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  GrowableArray<ScopeValue*>* decode_object_values(int decode_offset);
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  DebugInfoReadStream* stream_at(int decode_offset) const;
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  // Verification
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  void verify();
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#ifndef PRODUCT
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  // Printing support
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  void print_on(outputStream* st) const;
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  void print_on(outputStream* st, PcDesc* pd) const;
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  void print_value_on(outputStream* st) const;
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#endif
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};
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#endif // SHARE_VM_CODE_SCOPEDESC_HPP