Mercurial > hg > graal-compiler
view src/share/vm/code/pcDesc.hpp @ 3405:8cbcd406c42e
7042740: CMS: assert(n> q) failed: Looping at: ... blockOffsetTable.cpp:557
Summary: Do a one-step look-ahead, when sweeping free or garbage blocks, to avoid overstepping sweep limit, which may become a non-block-boundary because of a heap expansion delta coalescing with a previously co-terminal free block.
Reviewed-by: brutisso, tonyp
author | ysr |
---|---|
date | Fri, 27 May 2011 15:05:33 -0700 |
parents | f95d63e2154a |
children | 5857923e563c 7588156f5cf9 |
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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; union PcDescFlags { int word; struct { unsigned int reexecute: 1; unsigned int is_method_handle_invoke: 1; unsigned int return_oop: 1; } bits; bool operator ==(const PcDescFlags& other) { return word == other.word; } } _flags; 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.bits.reexecute; } void set_should_reexecute(bool z) { _flags.bits.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.bits.is_method_handle_invoke; } void set_is_method_handle_invoke(bool z) { _flags.bits.is_method_handle_invoke = z; } bool return_oop() const { return _flags.bits.return_oop; } void set_return_oop(bool z) { _flags.bits.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