author | psandoz |
Thu, 05 May 2016 18:14:51 -0700 | |
changeset 38240 | 28e0cafd5222 |
parent 35868 | bf29f15cdf30 |
child 37995 | 92aec042a43b |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_VM_CLASSFILE_COMPACTHASHTABLE_HPP |
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#define SHARE_VM_CLASSFILE_COMPACTHASHTABLE_HPP |
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|
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#include "classfile/stringTable.hpp" |
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#include "classfile/symbolTable.hpp" |
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#include "oops/symbol.hpp" |
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#include "services/diagnosticCommand.hpp" |
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#include "utilities/hashtable.hpp" |
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|
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class NumberSeq; |
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// Stats for symbol tables in the CDS archive |
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class CompactHashtableStats VALUE_OBJ_CLASS_SPEC { |
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public: |
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int hashentry_count; |
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int hashentry_bytes; |
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int bucket_count; |
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int bucket_bytes; |
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}; |
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///////////////////////////////////////////////////////////////////////// |
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// |
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// The compact hash table writer. Used at dump time for writing out |
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// the compact table to the shared archive. |
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// |
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// At dump time, the CompactHashtableWriter obtains all entries from the |
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// symbol/string table and adds them to a new temporary hash table. The hash |
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// table size (number of buckets) is calculated using |
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// '(num_entries + bucket_size - 1) / bucket_size'. The default bucket |
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// size is 4 and can be changed by -XX:SharedSymbolTableBucketSize option. |
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// 4 is chosen because it produces smaller sized bucket on average for |
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// faster lookup. It also has relatively small number of empty buckets and |
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// good distribution of the entries. |
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// |
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// We use a simple hash function (hash % num_bucket) for the table. |
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// The new table is compacted when written out. Please see comments |
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// above the CompactHashtable class for the table layout detail. The bucket |
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// offsets are written to the archive as part of the compact table. The |
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// bucket offset is encoded in the low 30-bit (0-29) and the bucket type |
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// (regular or compact) are encoded in bit[31, 30]. For buckets with more |
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// than one entry, both hash and entry offset are written to the |
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// table. For buckets with only one entry, only the entry offset is written |
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// to the table and the buckets are tagged as compact in their type bits. |
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// Buckets without entry are skipped from the table. Their offsets are |
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// still written out for faster lookup. |
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// |
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class CompactHashtableWriter: public StackObj { |
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public: |
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class Entry: public CHeapObj<mtSymbol> { |
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Entry* _next; |
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unsigned int _hash; |
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void* _literal; |
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public: |
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Entry(unsigned int hash, Symbol *symbol) : _next(NULL), _hash(hash), _literal(symbol) {} |
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Entry(unsigned int hash, oop string) : _next(NULL), _hash(hash), _literal(string) {} |
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void *value() { |
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return _literal; |
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} |
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Symbol *symbol() { |
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return (Symbol*)_literal; |
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} |
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oop string() { |
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return (oop)_literal; |
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} |
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unsigned int hash() { |
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return _hash; |
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} |
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Entry *next() {return _next;} |
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void set_next(Entry *p) {_next = p;} |
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}; // class CompactHashtableWriter::Entry |
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private: |
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static int number_of_buckets(int num_entries); |
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int _type; |
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int _num_entries; |
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int _num_buckets; |
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juint* _bucket_sizes; |
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Entry** _buckets; |
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int _required_bytes; |
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CompactHashtableStats* _stats; |
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public: |
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// This is called at dump-time only |
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CompactHashtableWriter(int table_type, int num_entries, CompactHashtableStats* stats); |
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~CompactHashtableWriter(); |
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int get_required_bytes() { |
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return _required_bytes; |
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} |
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inline void add(unsigned int hash, Symbol* symbol); |
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inline void add(unsigned int hash, oop string); |
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private: |
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void add(unsigned int hash, Entry* entry); |
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juint* dump_table(juint* p, juint** first_bucket, NumberSeq* summary); |
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juint* dump_buckets(juint* table, juint* p, NumberSeq* summary); |
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public: |
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void dump(char** top, char* end); |
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const char* table_name(); |
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}; |
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#define REGULAR_BUCKET_TYPE 0 |
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#define COMPACT_BUCKET_TYPE 1 |
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#define TABLEEND_BUCKET_TYPE 3 |
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#define BUCKET_OFFSET_MASK 0x3FFFFFFF |
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#define BUCKET_OFFSET(info) ((info) & BUCKET_OFFSET_MASK) |
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#define BUCKET_TYPE_SHIFT 30 |
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#define BUCKET_TYPE(info) (((info) & ~BUCKET_OFFSET_MASK) >> BUCKET_TYPE_SHIFT) |
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#define BUCKET_INFO(offset, type) (((type) << BUCKET_TYPE_SHIFT) | ((offset) & BUCKET_OFFSET_MASK)) |
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///////////////////////////////////////////////////////////////////////////// |
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// |
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// CompactHashtable is used to stored the CDS archive's symbol/string table. Used |
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// at runtime only to access the compact table from the archive. |
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// |
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// Because these tables are read-only (no entries can be added/deleted) at run-time |
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// and tend to have large number of entries, we try to minimize the footprint |
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// cost per entry. |
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// |
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// Layout of compact table in the shared archive: |
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// |
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// uintx base_address; |
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// juint num_entries; |
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// juint num_buckets; |
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// juint bucket_infos[num_buckets+1]; // bit[31,30]: type; bit[29-0]: offset |
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// juint table[] |
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// |
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// ----------------------------------- |
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// | base_address | num_entries | |
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// |---------------------------------| |
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// | num_buckets | bucket_info0 | |
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// |---------------------------------| |
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// | bucket_info1 | bucket_info2 | |
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// | bucket_info3 ... | |
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// | .... | table_end_info | |
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// |---------------------------------| |
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// | entry0 | |
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// | entry1 | |
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// | entry2 | |
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// | | |
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// | ... | |
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// ----------------------------------- |
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// |
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// The size of the bucket_info table is 'num_buckets + 1'. Each entry of the |
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// bucket_info table is a 32-bit encoding of the bucket type and bucket offset, |
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// with the type in the left-most 2-bit and offset in the remaining 30-bit. |
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// The last entry is a special type. It contains the offset of the last |
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// bucket end. We use that information when traversing the compact table. |
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// |
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// There are two types of buckets, regular buckets and compact buckets. The |
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// compact buckets have '01' in their highest 2-bit, and regular buckets have |
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// '00' in their highest 2-bit. |
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// |
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// For normal buckets, each entry is 8 bytes in the table[]: |
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// juint hash; /* symbol/string hash */ |
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// union { |
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// juint offset; /* Symbol* sym = (Symbol*)(base_address + offset) */ |
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// narrowOop str; /* String narrowOop encoding */ |
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// } |
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// |
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// |
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// For compact buckets, each entry has only the 4-byte 'offset' in the table[]. |
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// |
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// See CompactHashtable::lookup() for how the table is searched at runtime. |
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// See CompactHashtableWriter::dump() for how the table is written at CDS |
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// dump time. |
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// |
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template <class T, class N> class CompactHashtable VALUE_OBJ_CLASS_SPEC { |
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friend class VMStructs; |
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|
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public: |
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enum CompactHashtableType { |
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_symbol_table = 0, |
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_string_table = 1 |
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}; |
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|
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private: |
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CompactHashtableType _type; |
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uintx _base_address; |
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juint _entry_count; |
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juint _bucket_count; |
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juint _table_end_offset; |
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juint* _buckets; |
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|
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inline Symbol* lookup_entry(CompactHashtable<Symbol*, char>* const t, |
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juint* addr, const char* name, int len); |
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|
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inline oop lookup_entry(CompactHashtable<oop, char>* const t, |
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juint* addr, const char* name, int len); |
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public: |
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CompactHashtable() { |
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_entry_count = 0; |
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_bucket_count = 0; |
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_table_end_offset = 0; |
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_buckets = 0; |
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} |
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const char* init(CompactHashtableType type, const char *buffer); |
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|
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void reset() { |
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_entry_count = 0; |
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_bucket_count = 0; |
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_table_end_offset = 0; |
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_buckets = 0; |
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} |
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|
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// Lookup an entry from the compact table |
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inline T lookup(const N* name, unsigned int hash, int len); |
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|
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// iterate over symbols |
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void symbols_do(SymbolClosure *cl); |
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|
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// iterate over strings |
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void oops_do(OopClosure* f); |
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}; |
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//////////////////////////////////////////////////////////////////////// |
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// |
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// Read/Write the contents of a hashtable textual dump (created by |
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// SymbolTable::dump and StringTable::dump). |
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// Because the dump file may be big (hundred of MB in extreme cases), |
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// we use mmap for fast access when reading it. |
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// |
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class HashtableTextDump VALUE_OBJ_CLASS_SPEC { |
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int _fd; |
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const char* _base; |
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const char* _p; |
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const char* _end; |
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const char* _filename; |
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size_t _size; |
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int _prefix_type; |
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int _line_no; |
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public: |
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HashtableTextDump(const char* filename); |
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~HashtableTextDump(); |
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|
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enum { |
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SymbolPrefix = 1 << 0, |
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StringPrefix = 1 << 1, |
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Unknown = 1 << 2 |
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}; |
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|
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void quit(const char* err, const char* msg); |
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|
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inline int remain() { |
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return (int)(_end - _p); |
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} |
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void corrupted(const char *p, const char *msg); |
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|
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inline void corrupted_if(bool cond, const char *msg) { |
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if (cond) { |
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corrupted(_p, msg); |
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} |
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} |
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|
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bool skip_newline(); |
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int skip(char must_be_char); |
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void skip_past(char c); |
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void check_version(const char* ver); |
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|
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inline void get_num(char delim, int *num) { |
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const char* p = _p; |
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const char* end = _end; |
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u8 n = 0; |
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|
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295 |
while (p < end) { |
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char c = *p ++; |
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297 |
if ('0' <= c && c <= '9') { |
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n = n * 10 + (c - '0'); |
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299 |
if (n > (u8)INT_MAX) { |
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corrupted(_p, "Num overflow"); |
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} |
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} else if (c == delim) { |
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_p = p; |
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*num = (int)n; |
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305 |
return; |
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306 |
} else { |
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307 |
// Not [0-9], not 'delim' |
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308 |
corrupted(_p, "Unrecognized format");; |
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309 |
} |
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310 |
} |
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|
311 |
|
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corrupted(_end, "Incorrect format"); |
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ShouldNotReachHere(); |
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|
314 |
} |
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315 |
|
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316 |
void scan_prefix_type(); |
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int scan_prefix(int* utf8_length); |
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int scan_string_prefix(); |
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|
319 |
int scan_symbol_prefix(); |
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|
320 |
|
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|
321 |
jchar unescape(const char* from, const char* end, int count); |
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322 |
void get_utf8(char* utf8_buffer, int utf8_length); |
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|
323 |
static void put_utf8(outputStream* st, const char* utf8_string, int utf8_length); |
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|
324 |
}; |
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325 |
|
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|
326 |
/////////////////////////////////////////////////////////////////////// |
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|
327 |
// |
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|
328 |
// jcmd command support for symbol table and string table dumping: |
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|
329 |
// VM.symboltable -verbose: for dumping the symbol table |
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330 |
// VM.stringtable -verbose: for dumping the string table |
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|
331 |
// |
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|
332 |
class VM_DumpHashtable : public VM_Operation { |
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|
333 |
private: |
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|
334 |
outputStream* _out; |
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|
335 |
int _which; |
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|
336 |
bool _verbose; |
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|
337 |
public: |
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|
338 |
enum { |
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|
339 |
DumpSymbols = 1 << 0, |
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parents:
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|
340 |
DumpStrings = 1 << 1, |
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|
341 |
DumpSysDict = 1 << 2 // not implemented yet |
047115468f16
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diff
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|
342 |
}; |
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|
343 |
VM_DumpHashtable(outputStream* out, int which, bool verbose) { |
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|
344 |
_out = out; |
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diff
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|
345 |
_which = which; |
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parents:
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|
346 |
_verbose = verbose; |
047115468f16
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jiangli
parents:
diff
changeset
|
347 |
} |
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parents:
diff
changeset
|
348 |
|
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|
349 |
virtual VMOp_Type type() const { return VMOp_DumpHashtable; } |
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|
350 |
|
047115468f16
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parents:
diff
changeset
|
351 |
virtual void doit() { |
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parents:
diff
changeset
|
352 |
switch (_which) { |
047115468f16
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jiangli
parents:
diff
changeset
|
353 |
case DumpSymbols: |
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parents:
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|
354 |
SymbolTable::dump(_out, _verbose); |
047115468f16
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jiangli
parents:
diff
changeset
|
355 |
break; |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
356 |
case DumpStrings: |
047115468f16
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parents:
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|
357 |
StringTable::dump(_out, _verbose); |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
358 |
break; |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
359 |
default: |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
360 |
ShouldNotReachHere(); |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
361 |
} |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
362 |
} |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
363 |
}; |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
364 |
|
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
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|
365 |
class SymboltableDCmd : public DCmdWithParser { |
047115468f16
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parents:
diff
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|
366 |
protected: |
047115468f16
8059510: Compact symbol table layout inside shared archive.
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parents:
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|
367 |
DCmdArgument<bool> _verbose; |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
368 |
public: |
047115468f16
8059510: Compact symbol table layout inside shared archive.
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parents:
diff
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|
369 |
SymboltableDCmd(outputStream* output, bool heap); |
047115468f16
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parents:
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|
370 |
static const char* name() { |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
371 |
return "VM.symboltable"; |
047115468f16
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jiangli
parents:
diff
changeset
|
372 |
} |
047115468f16
8059510: Compact symbol table layout inside shared archive.
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parents:
diff
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|
373 |
static const char* description() { |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
374 |
return "Dump symbol table."; |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
375 |
} |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
376 |
static const char* impact() { |
047115468f16
8059510: Compact symbol table layout inside shared archive.
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parents:
diff
changeset
|
377 |
return "Medium: Depends on Java content."; |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
378 |
} |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
379 |
static const JavaPermission permission() { |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
380 |
JavaPermission p = {"java.lang.management.ManagementPermission", |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
381 |
"monitor", NULL}; |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
382 |
return p; |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
383 |
} |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
384 |
static int num_arguments(); |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
385 |
virtual void execute(DCmdSource source, TRAPS); |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
386 |
}; |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
387 |
|
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
388 |
class StringtableDCmd : public DCmdWithParser { |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
389 |
protected: |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
390 |
DCmdArgument<bool> _verbose; |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
391 |
public: |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
392 |
StringtableDCmd(outputStream* output, bool heap); |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
393 |
static const char* name() { |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
394 |
return "VM.stringtable"; |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
395 |
} |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
396 |
static const char* description() { |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
397 |
return "Dump string table."; |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
398 |
} |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
399 |
static const char* impact() { |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
400 |
return "Medium: Depends on Java content."; |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
401 |
} |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
402 |
static const JavaPermission permission() { |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
403 |
JavaPermission p = {"java.lang.management.ManagementPermission", |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
404 |
"monitor", NULL}; |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
405 |
return p; |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
406 |
} |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
407 |
static int num_arguments(); |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
408 |
virtual void execute(DCmdSource source, TRAPS); |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
409 |
}; |
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
410 |
|
047115468f16
8059510: Compact symbol table layout inside shared archive.
jiangli
parents:
diff
changeset
|
411 |
#endif // SHARE_VM_CLASSFILE_COMPACTHASHTABLE_HPP |