98 lines
3.4 KiB
C++
98 lines
3.4 KiB
C++
/*
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* Copyright (c) 1997, 2010, 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_PCDESC_HPP
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#define SHARE_VM_CODE_PCDESC_HPP
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#include "memory/allocation.hpp"
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// PcDescs map a physical PC (given as offset from start of nmethod) to
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// the corresponding source scope and byte code index.
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class nmethod;
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class PcDesc VALUE_OBJ_CLASS_SPEC {
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friend class VMStructs;
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private:
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int _pc_offset; // offset from start of nmethod
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int _scope_decode_offset; // offset for scope in nmethod
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int _obj_decode_offset;
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enum {
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PCDESC_reexecute = 1 << 0,
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PCDESC_is_method_handle_invoke = 1 << 1,
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PCDESC_return_oop = 1 << 2
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};
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int _flags;
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void set_flag(int mask, bool z) {
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_flags = z ? (_flags | mask) : (_flags & ~mask);
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}
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public:
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int pc_offset() const { return _pc_offset; }
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int scope_decode_offset() const { return _scope_decode_offset; }
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int obj_decode_offset() const { return _obj_decode_offset; }
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void set_pc_offset(int x) { _pc_offset = x; }
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void set_scope_decode_offset(int x) { _scope_decode_offset = x; }
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void set_obj_decode_offset(int x) { _obj_decode_offset = x; }
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// Constructor (only used for static in nmethod.cpp)
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// Also used by ScopeDesc::sender()]
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PcDesc(int pc_offset, int scope_decode_offset, int obj_decode_offset);
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enum {
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// upper and lower exclusive limits real offsets:
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lower_offset_limit = -1,
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upper_offset_limit = (unsigned int)-1 >> 1
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};
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// Flags
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bool should_reexecute() const { return (_flags & PCDESC_reexecute) != 0; }
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void set_should_reexecute(bool z) { set_flag(PCDESC_reexecute, z); }
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// Does pd refer to the same information as pd?
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bool is_same_info(const PcDesc* pd) {
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return _scope_decode_offset == pd->_scope_decode_offset &&
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_obj_decode_offset == pd->_obj_decode_offset &&
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_flags == pd->_flags;
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}
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bool is_method_handle_invoke() const { return (_flags & PCDESC_is_method_handle_invoke) != 0; }
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void set_is_method_handle_invoke(bool z) { set_flag(PCDESC_is_method_handle_invoke, z); }
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bool return_oop() const { return (_flags & PCDESC_return_oop) != 0; }
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void set_return_oop(bool z) { set_flag(PCDESC_return_oop, z); }
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// Returns the real pc
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address real_pc(const nmethod* code) const;
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void print(nmethod* code);
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bool verify(nmethod* code);
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};
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#endif // SHARE_VM_CODE_PCDESC_HPP
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