Mercurial > hg > graal-compiler
view src/share/vm/code/location.hpp @ 3992:d1bdeef3e3e2
7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76
Summary: There is a race between one thread successfully forwarding and copying the klass mirror for the SoftReference class (including the static master clock) and another thread attempting to use the master clock while attempting to discover a soft reference object. Maintain a shadow copy of the soft reference master clock and use the shadow during reference discovery and reference processing.
Reviewed-by: tonyp, brutisso, ysr
author | johnc |
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date | Wed, 12 Oct 2011 10:25:51 -0700 |
parents | f95d63e2154a |
children |
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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_LOCATION_HPP #define SHARE_VM_CODE_LOCATION_HPP #include "asm/assembler.hpp" #include "code/vmreg.hpp" #include "memory/allocation.hpp" // A Location describes a concrete machine variable location // (such as integer or floating point register or a stack-held // variable). Used when generating debug-information for nmethods. // // Encoding: // // bits (use low bits for best compression): // Type: [3..0] // Where: [4] // Offset: [31..5] class Location VALUE_OBJ_CLASS_SPEC { friend class VMStructs; public: enum Where { on_stack, in_register }; enum Type { invalid, // Invalid location normal, // Ints, floats, double halves oop, // Oop (please GC me!) int_in_long, // Integer held in long register lng, // Long held in one register float_in_dbl, // Float held in double register dbl, // Double held in one register addr, // JSR return address narrowoop // Narrow Oop (please GC me!) }; private: enum { TYPE_MASK = (juint) 0x0F, TYPE_SHIFT = 0, WHERE_MASK = (juint) 0x10, WHERE_SHIFT = 4, OFFSET_MASK = (juint) 0xFFFFFFE0, OFFSET_SHIFT = 5 }; juint _value; // Create a bit-packed Location Location(Where where_, Type type_, unsigned offset_) { set(where_, type_, offset_); assert( where () == where_ , "" ); assert( type () == type_ , "" ); assert( offset() == offset_, "" ); } inline void set(Where where_, Type type_, unsigned offset_) { _value = (juint) ((where_ << WHERE_SHIFT) | (type_ << TYPE_SHIFT) | ((offset_ << OFFSET_SHIFT) & OFFSET_MASK)); } public: // Stack location Factory. Offset is 4-byte aligned; remove low bits static Location new_stk_loc( Type t, int offset ) { return Location(on_stack,t,offset>>LogBytesPerInt); } // Register location Factory static Location new_reg_loc( Type t, VMReg reg ) { return Location(in_register, t, reg->value()); } // Default constructor Location() { set(on_stack,invalid,0); } // Bit field accessors Where where() const { return (Where) ((_value & WHERE_MASK) >> WHERE_SHIFT);} Type type() const { return (Type) ((_value & TYPE_MASK) >> TYPE_SHIFT); } unsigned offset() const { return (unsigned) ((_value & OFFSET_MASK) >> OFFSET_SHIFT); } // Accessors bool is_register() const { return where() == in_register; } bool is_stack() const { return where() == on_stack; } int stack_offset() const { assert(where() == on_stack, "wrong Where"); return offset()<<LogBytesPerInt; } int register_number() const { assert(where() == in_register, "wrong Where"); return offset() ; } VMReg reg() const { assert(where() == in_register, "wrong Where"); return VMRegImpl::as_VMReg(offset()) ; } // Printing void print_on(outputStream* st) const; // Serialization of debugging information Location(DebugInfoReadStream* stream); void write_on(DebugInfoWriteStream* stream); // check static bool legal_offset_in_bytes(int offset_in_bytes); }; #endif // SHARE_VM_CODE_LOCATION_HPP