Mercurial > hg > graal-compiler
view src/share/vm/ci/ciBaseObject.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 | da91efe96a93 |
children |
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/* * Copyright (c) 2011, 2012, 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_CI_CIBASEOBJECT_HPP #define SHARE_VM_CI_CIBASEOBJECT_HPP #include "ci/ciClassList.hpp" #include "memory/allocation.hpp" #include "runtime/handles.hpp" #include "runtime/jniHandles.hpp" // ciBaseObject // // This class represents an oop in the HotSpot virtual machine. // Its subclasses are structured in a hierarchy which mirrors // an aggregate of the VM's oop and klass hierarchies (see // oopHierarchy.hpp). Each instance of ciBaseObject holds a handle // to a corresponding oop on the VM side and provides routines // for accessing the information in its oop. By using the ciBaseObject // hierarchy for accessing oops in the VM, the compiler ensures // that it is safe with respect to garbage collection; that is, // GC and compilation can proceed independently without // interference. // // Within the VM, the oop and klass hierarchies are separate. // The compiler interface does not preserve this separation -- // the distinction between `Klass*' and `Klass' are not // reflected in the interface and instead the Klass hierarchy // is directly modeled as the subclasses of ciKlass. class ciBaseObject : public ResourceObj { CI_PACKAGE_ACCESS friend class ciEnv; protected: uint _ident; enum { FLAG_BITS = 1 }; enum { SCAVENGABLE_FLAG = 1 }; protected: ciBaseObject(): _ident(0) {} virtual const char* type_string() { return "ciBaseObject"; } void set_ident(uint id); public: // A number unique to this object. uint ident(); // What kind of ciBaseObject is this? virtual bool is_symbol() const { return false; } virtual bool is_object() const { return false; } virtual bool is_metadata() const { return false; } ciSymbol* as_symbol() { assert(is_symbol(), "must be"); return (ciSymbol*)this; } ciObject* as_object() { assert(is_object(), "must be"); return (ciObject*)this; } ciMetadata* as_metadata() { assert(is_metadata(), "must be"); return (ciMetadata*)this; } }; #endif // SHARE_VM_CI_CIBASEOBJECT_HPP