aoqi@0: /*
aoqi@0:  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #ifndef SHARE_VM_CODE_PCDESC_HPP
aoqi@0: #define SHARE_VM_CODE_PCDESC_HPP
aoqi@0: 
aoqi@0: #include "memory/allocation.hpp"
aoqi@0: 
aoqi@0: // PcDescs map a physical PC (given as offset from start of nmethod) to
aoqi@0: // the corresponding source scope and byte code index.
aoqi@0: 
aoqi@0: class nmethod;
aoqi@0: 
aoqi@0: class PcDesc VALUE_OBJ_CLASS_SPEC {
aoqi@0:   friend class VMStructs;
aoqi@0:  private:
aoqi@0:   int _pc_offset;           // offset from start of nmethod
aoqi@0:   int _scope_decode_offset; // offset for scope in nmethod
aoqi@0:   int _obj_decode_offset;
aoqi@0: 
aoqi@0:   enum {
aoqi@0:     PCDESC_reexecute               = 1 << 0,
aoqi@0:     PCDESC_is_method_handle_invoke = 1 << 1,
aoqi@0:     PCDESC_return_oop              = 1 << 2
aoqi@0:   };
aoqi@0: 
aoqi@0:   int _flags;
aoqi@0: 
aoqi@0:   void set_flag(int mask, bool z) {
aoqi@0:     _flags = z ? (_flags | mask) : (_flags & ~mask);
aoqi@0:   }
aoqi@0: 
aoqi@0:  public:
aoqi@0:   int pc_offset() const           { return _pc_offset;   }
aoqi@0:   int scope_decode_offset() const { return _scope_decode_offset; }
aoqi@0:   int obj_decode_offset() const   { return _obj_decode_offset; }
aoqi@0: 
aoqi@0:   void set_pc_offset(int x)           { _pc_offset           = x; }
aoqi@0:   void set_scope_decode_offset(int x) { _scope_decode_offset = x; }
aoqi@0:   void set_obj_decode_offset(int x)   { _obj_decode_offset   = x; }
aoqi@0: 
aoqi@0:   // Constructor (only used for static in nmethod.cpp)
aoqi@0:   // Also used by ScopeDesc::sender()]
aoqi@0:   PcDesc(int pc_offset, int scope_decode_offset, int obj_decode_offset);
aoqi@0: 
aoqi@0:   enum {
aoqi@0:     // upper and lower exclusive limits real offsets:
aoqi@0:     lower_offset_limit = -1,
aoqi@0:     upper_offset_limit = (unsigned int)-1 >> 1
aoqi@0:   };
aoqi@0: 
aoqi@0:   // Flags
aoqi@0:   bool     should_reexecute()              const { return (_flags & PCDESC_reexecute) != 0; }
aoqi@0:   void set_should_reexecute(bool z)              { set_flag(PCDESC_reexecute, z); }
aoqi@0: 
aoqi@0:   // Does pd refer to the same information as pd?
aoqi@0:   bool is_same_info(const PcDesc* pd) {
aoqi@0:     return _scope_decode_offset == pd->_scope_decode_offset &&
aoqi@0:       _obj_decode_offset == pd->_obj_decode_offset &&
aoqi@0:       _flags == pd->_flags;
aoqi@0:   }
aoqi@0: 
aoqi@0:   bool     is_method_handle_invoke()       const { return (_flags & PCDESC_is_method_handle_invoke) != 0;     }
aoqi@0:   void set_is_method_handle_invoke(bool z)       { set_flag(PCDESC_is_method_handle_invoke, z); }
aoqi@0: 
aoqi@0:   bool     return_oop()                    const { return (_flags & PCDESC_return_oop) != 0;     }
aoqi@0:   void set_return_oop(bool z)                    { set_flag(PCDESC_return_oop, z); }
aoqi@0: 
aoqi@0:   // Returns the real pc
aoqi@0:   address real_pc(const nmethod* code) const;
aoqi@0: 
aoqi@0:   void print(nmethod* code);
aoqi@0:   bool verify(nmethod* code);
aoqi@0: };
aoqi@0: 
aoqi@0: #endif // SHARE_VM_CODE_PCDESC_HPP