Mercurial > hg > graal-compiler
view src/share/vm/libadt/dict.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 |
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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_LIBADT_DICT_HPP #define SHARE_VM_LIBADT_DICT_HPP #include "libadt/port.hpp" // Dictionaries - An Abstract Data Type //INTERFACE class ostream; class Dict; // These dictionaries define a key-value mapping. They can be inserted to, // searched or deleted from. They grow and shrink as needed. The key is a // pointer to something (or anything which can be stored in a pointer). A // key comparison routine determines if two keys are equal or not. A hash // function can be provided; if it's not provided the key itself is used // instead. A nice string hash function is included. typedef int32 (*CmpKey)(const void *key1, const void *key2); typedef int (*Hash)(const void *key); typedef void (*FuncDict)(const void *key, const void *val, Dict *d); class Dict : public ResourceObj { // Dictionary structure private: class Arena *_arena; // Where to draw storage from class bucket *_bin; // Hash table is array of buckets uint _size; // Size (# of slots) in hash table uint32 _cnt; // Number of key-value pairs in hash table const Hash _hash; // Hashing function const CmpKey _cmp; // Key comparison function void doubhash( void ); // Double hash table size public: friend class DictI; // Friendly iterator function // cmp is a key comparision routine. hash is a routine to hash a key. Dict( CmpKey cmp, Hash hash ); Dict( CmpKey cmp, Hash hash, Arena *arena, int size=16 ); ~Dict(); Dict( const Dict & ); // Deep-copy guts Dict &operator =( const Dict & ); // Zap to empty; ready for re-use void Clear(); // Return # of key-value pairs in dict uint32 Size(void) const { return _cnt; } // Insert inserts the given key-value pair into the dictionary. The prior // value of the key is returned; NULL if the key was not previously defined. void *Insert(void *key, void *val, bool replace = true); // A new key-value void *Delete(void *key); // Delete & return old // Find finds the value of a given key; or NULL if not found. // The dictionary is NOT changed. void *operator [](const void *key) const; // Do a lookup // == compares two dictionaries; they must have the same keys (their keys // must match using CmpKey) and they must have the same values (pointer // comparison). If so 1 is returned, if not 0 is returned. int32 operator ==(const Dict &d) const; // Compare dictionaries for equal // Print out the dictionary contents as key-value pairs void print(); }; // Hashing functions int hashstr(const void *s); // Nice string hash // Slimey cheap hash function; no guaranteed performance. Better than the // default for pointers, especially on MS-DOS machines. int hashptr(const void *key); // Slimey cheap hash function; no guaranteed performance. int hashkey(const void *key); // Key comparators int32 cmpstr(const void *k1, const void *k2); // Slimey cheap key comparator. int32 cmpkey(const void *key1, const void *key2); //------------------------------Iteration-------------------------------------- // The class of dictionary iterators. Fails in the presences of modifications // to the dictionary during iteration (including searches). // Usage: for( DictI i(dict); i.test(); ++i ) { body = i.key; body = i.value;} class DictI { private: const Dict *_d; // Dictionary being iterated over uint _i; // Counter over the bins uint _j; // Counter inside each bin public: const void *_key, *_value; // Easy access to the key-value pair DictI( const Dict *d ) {reset(d);}; // Create a new iterator void reset( const Dict *dict ); // Reset existing iterator void operator ++(void); // Increment iterator int test(void) { return _i<_d->_size;} // Test for end of iteration }; #endif // SHARE_VM_LIBADT_DICT_HPP