1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/code/pcDesc.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,97 @@
1.4 +/*
1.5 + * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_CODE_PCDESC_HPP
1.29 +#define SHARE_VM_CODE_PCDESC_HPP
1.30 +
1.31 +#include "memory/allocation.hpp"
1.32 +
1.33 +// PcDescs map a physical PC (given as offset from start of nmethod) to
1.34 +// the corresponding source scope and byte code index.
1.35 +
1.36 +class nmethod;
1.37 +
1.38 +class PcDesc VALUE_OBJ_CLASS_SPEC {
1.39 + friend class VMStructs;
1.40 + private:
1.41 + int _pc_offset; // offset from start of nmethod
1.42 + int _scope_decode_offset; // offset for scope in nmethod
1.43 + int _obj_decode_offset;
1.44 +
1.45 + enum {
1.46 + PCDESC_reexecute = 1 << 0,
1.47 + PCDESC_is_method_handle_invoke = 1 << 1,
1.48 + PCDESC_return_oop = 1 << 2
1.49 + };
1.50 +
1.51 + int _flags;
1.52 +
1.53 + void set_flag(int mask, bool z) {
1.54 + _flags = z ? (_flags | mask) : (_flags & ~mask);
1.55 + }
1.56 +
1.57 + public:
1.58 + int pc_offset() const { return _pc_offset; }
1.59 + int scope_decode_offset() const { return _scope_decode_offset; }
1.60 + int obj_decode_offset() const { return _obj_decode_offset; }
1.61 +
1.62 + void set_pc_offset(int x) { _pc_offset = x; }
1.63 + void set_scope_decode_offset(int x) { _scope_decode_offset = x; }
1.64 + void set_obj_decode_offset(int x) { _obj_decode_offset = x; }
1.65 +
1.66 + // Constructor (only used for static in nmethod.cpp)
1.67 + // Also used by ScopeDesc::sender()]
1.68 + PcDesc(int pc_offset, int scope_decode_offset, int obj_decode_offset);
1.69 +
1.70 + enum {
1.71 + // upper and lower exclusive limits real offsets:
1.72 + lower_offset_limit = -1,
1.73 + upper_offset_limit = (unsigned int)-1 >> 1
1.74 + };
1.75 +
1.76 + // Flags
1.77 + bool should_reexecute() const { return (_flags & PCDESC_reexecute) != 0; }
1.78 + void set_should_reexecute(bool z) { set_flag(PCDESC_reexecute, z); }
1.79 +
1.80 + // Does pd refer to the same information as pd?
1.81 + bool is_same_info(const PcDesc* pd) {
1.82 + return _scope_decode_offset == pd->_scope_decode_offset &&
1.83 + _obj_decode_offset == pd->_obj_decode_offset &&
1.84 + _flags == pd->_flags;
1.85 + }
1.86 +
1.87 + bool is_method_handle_invoke() const { return (_flags & PCDESC_is_method_handle_invoke) != 0; }
1.88 + void set_is_method_handle_invoke(bool z) { set_flag(PCDESC_is_method_handle_invoke, z); }
1.89 +
1.90 + bool return_oop() const { return (_flags & PCDESC_return_oop) != 0; }
1.91 + void set_return_oop(bool z) { set_flag(PCDESC_return_oop, z); }
1.92 +
1.93 + // Returns the real pc
1.94 + address real_pc(const nmethod* code) const;
1.95 +
1.96 + void print(nmethod* code);
1.97 + bool verify(nmethod* code);
1.98 +};
1.99 +
1.100 +#endif // SHARE_VM_CODE_PCDESC_HPP
