duke@435: /*
cfang@1366:  * Copyright 1997-2009 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: // SimpleScopeDesc is used when all you need to extract from
duke@435: // a given pc,nmethod pair is a methodOop and a bci. This is
duke@435: // quite a bit faster than allocating a full ScopeDesc, but
duke@435: // very limited in abilities.
duke@435: 
duke@435: class SimpleScopeDesc : public StackObj {
duke@435:  private:
duke@435:   methodOop _method;
duke@435:   int _bci;
duke@435: 
duke@435:  public:
duke@435:   SimpleScopeDesc(nmethod* code,address pc) {
duke@435:     PcDesc* pc_desc = code->pc_desc_at(pc);
duke@435:     assert(pc_desc != NULL, "Must be able to find matching PcDesc");
duke@435:     DebugInfoReadStream buffer(code, pc_desc->scope_decode_offset());
duke@435:     int ignore_sender = buffer.read_int();
duke@435:     _method           = methodOop(buffer.read_oop());
cfang@1366:     _bci              = buffer.read_bci();
duke@435:   }
duke@435: 
duke@435:   methodOop method() { return _method; }
duke@435:   int bci() { return _bci; }
duke@435: };
duke@435: 
duke@435: // ScopeDescs contain the information that makes source-level debugging of
duke@435: // nmethods possible; each scopeDesc describes a method activation
duke@435: 
duke@435: class ScopeDesc : public ResourceObj {
duke@435:  public:
duke@435:   // Constructor
cfang@1366:   ScopeDesc(const nmethod* code, int decode_offset, int obj_decode_offset, bool reexecute);
duke@435: 
duke@435:   // Calls above, giving default value of "serialized_null" to the
duke@435:   // "obj_decode_offset" argument.  (We don't use a default argument to
duke@435:   // avoid a .hpp-.hpp dependency.)
cfang@1366:   ScopeDesc(const nmethod* code, int decode_offset, bool reexecute);
duke@435: 
duke@435:   // JVM state
cfang@1335:   methodHandle method()   const { return _method; }
cfang@1335:   int          bci()      const { return _bci;    }
cfang@1335:   bool should_reexecute() const { return _reexecute; }
duke@435: 
duke@435:   GrowableArray<ScopeValue*>*   locals();
duke@435:   GrowableArray<ScopeValue*>*   expressions();
duke@435:   GrowableArray<MonitorValue*>* monitors();
duke@435:   GrowableArray<ScopeValue*>*   objects();
duke@435: 
duke@435:   // Stack walking, returns NULL if this is the outer most scope.
duke@435:   ScopeDesc* sender() const;
duke@435: 
duke@435:   // Returns where the scope was decoded
duke@435:   int decode_offset() const { return _decode_offset; }
duke@435: 
duke@435:   // Tells whether sender() returns NULL
duke@435:   bool is_top() const;
duke@435:   // Tells whether sd is equal to this
duke@435:   bool is_equal(ScopeDesc* sd) const;
duke@435: 
duke@435:  private:
duke@435:   // Alternative constructor
duke@435:   ScopeDesc(const ScopeDesc* parent);
duke@435: 
duke@435:   // JVM state
duke@435:   methodHandle  _method;
duke@435:   int           _bci;
cfang@1335:   bool          _reexecute;
duke@435: 
duke@435:   // Decoding offsets
duke@435:   int _decode_offset;
duke@435:   int _sender_decode_offset;
duke@435:   int _locals_decode_offset;
duke@435:   int _expressions_decode_offset;
duke@435:   int _monitors_decode_offset;
duke@435: 
duke@435:   // Object pool
duke@435:   GrowableArray<ScopeValue*>* _objects;
duke@435: 
duke@435:   // Nmethod information
duke@435:   const nmethod* _code;
duke@435: 
duke@435:   // Decoding operations
duke@435:   void decode_body();
duke@435:   GrowableArray<ScopeValue*>* decode_scope_values(int decode_offset);
duke@435:   GrowableArray<MonitorValue*>* decode_monitor_values(int decode_offset);
duke@435:   GrowableArray<ScopeValue*>* decode_object_values(int decode_offset);
duke@435: 
duke@435:   DebugInfoReadStream* stream_at(int decode_offset) const;
duke@435: 
duke@435: 
duke@435:  public:
duke@435:   // Verification
duke@435:   void verify();
duke@435: 
duke@435: #ifndef PRODUCT
duke@435:  public:
duke@435:   // Printing support
duke@435:   void print_on(outputStream* st) const;
duke@435:   void print_on(outputStream* st, PcDesc* pd) const;
duke@435:   void print_value_on(outputStream* st) const;
duke@435: #endif
duke@435: };