Mercurial > hg > graal-compiler
view src/share/vm/code/pcDesc.hpp @ 8710:9058789475af
7107135: Stack guard pages are no more protected after loading a shared library with executable stack
Summary: Detect the execstack attribute of the loaded library and attempt to fix the stack guard using Safepoint op.
Reviewed-by: dholmes, zgu
Contributed-by: ioi.lam@oracle.com
author | iklam |
---|---|
date | Tue, 05 Mar 2013 13:55:56 -0800 |
parents | 7588156f5cf9 |
children | 04b9a2566eec |
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/* * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_CODE_PCDESC_HPP #define SHARE_VM_CODE_PCDESC_HPP #include "memory/allocation.hpp" // PcDescs map a physical PC (given as offset from start of nmethod) to // the corresponding source scope and byte code index. class nmethod; class PcDesc VALUE_OBJ_CLASS_SPEC { friend class VMStructs; private: int _pc_offset; // offset from start of nmethod int _scope_decode_offset; // offset for scope in nmethod int _obj_decode_offset; enum { PCDESC_reexecute = 1 << 0, PCDESC_is_method_handle_invoke = 1 << 1, PCDESC_return_oop = 1 << 2 }; int _flags; void set_flag(int mask, bool z) { _flags = z ? (_flags | mask) : (_flags & ~mask); } public: int pc_offset() const { return _pc_offset; } int scope_decode_offset() const { return _scope_decode_offset; } int obj_decode_offset() const { return _obj_decode_offset; } void set_pc_offset(int x) { _pc_offset = x; } void set_scope_decode_offset(int x) { _scope_decode_offset = x; } void set_obj_decode_offset(int x) { _obj_decode_offset = x; } // Constructor (only used for static in nmethod.cpp) // Also used by ScopeDesc::sender()] PcDesc(int pc_offset, int scope_decode_offset, int obj_decode_offset); enum { // upper and lower exclusive limits real offsets: lower_offset_limit = -1, upper_offset_limit = (unsigned int)-1 >> 1 }; // Flags bool should_reexecute() const { return (_flags & PCDESC_reexecute) != 0; } void set_should_reexecute(bool z) { set_flag(PCDESC_reexecute, z); } // Does pd refer to the same information as pd? bool is_same_info(const PcDesc* pd) { return _scope_decode_offset == pd->_scope_decode_offset && _obj_decode_offset == pd->_obj_decode_offset && _flags == pd->_flags; } bool is_method_handle_invoke() const { return (_flags & PCDESC_is_method_handle_invoke) != 0; } void set_is_method_handle_invoke(bool z) { set_flag(PCDESC_is_method_handle_invoke, z); } bool return_oop() const { return (_flags & PCDESC_return_oop) != 0; } void set_return_oop(bool z) { set_flag(PCDESC_return_oop, z); } // Returns the real pc address real_pc(const nmethod* code) const; void print(nmethod* code); bool verify(nmethod* code); }; #endif // SHARE_VM_CODE_PCDESC_HPP