author | jwilhelm |
Thu, 06 Jul 2017 01:50:26 +0200 | |
changeset 46630 | 75aa3e39d02c |
parent 39713 | 29ece76096cb |
child 46742 | 24ec8a039c90 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2016, 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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#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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template <class T, class N> class CompactHashtable; |
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class NumberSeq; |
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class SimpleCompactHashtable; |
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class SerializeClosure; |
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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 VALUE_OBJ_CLASS_SPEC { |
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unsigned int _hash; |
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u4 _value; |
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public: |
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Entry() {} |
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Entry(unsigned int hash, u4 val) : _hash(hash), _value(val) {} |
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u4 value() { |
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return _value; |
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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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bool operator==(const CompactHashtableWriter::Entry& other) { |
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return (_value == other._value && _hash == other._hash); |
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} |
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}; // class CompactHashtableWriter::Entry |
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private: |
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int _num_entries; |
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int _num_buckets; |
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int _num_empty_buckets; |
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int _num_value_only_buckets; |
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int _num_other_buckets; |
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GrowableArray<Entry>** _buckets; |
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CompactHashtableStats* _stats; |
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Array<u4>* _compact_buckets; |
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Array<u4>* _compact_entries; |
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public: |
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// This is called at dump-time only |
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CompactHashtableWriter(int num_buckets, CompactHashtableStats* stats); |
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~CompactHashtableWriter(); |
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void add(unsigned int hash, u4 value); |
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void add(u4 value) { |
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add((unsigned int)value, value); |
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} |
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private: |
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void allocate_table(); |
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void dump_table(NumberSeq* summary); |
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public: |
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void dump(SimpleCompactHashtable *cht, const char* table_name); |
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const char* table_name(); |
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}; |
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class CompactSymbolTableWriter: public CompactHashtableWriter { |
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CompactSymbolTableWriter(int num_buckets, CompactHashtableStats* stats) : |
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CompactHashtableWriter(num_buckets, stats) {} |
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void add(unsigned int hash, Symbol *symbol); |
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void dump(CompactHashtable<Symbol*, char> *cht); |
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}; |
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class CompactStringTableWriter: public CompactHashtableWriter { |
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CompactStringTableWriter(int num_entries, CompactHashtableStats* stats) : |
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CompactHashtableWriter(num_entries, stats) {} |
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void add(unsigned int hash, oop string); |
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void dump(CompactHashtable<oop, char> *cht); |
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}; |
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#define REGULAR_BUCKET_TYPE 0 |
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#define VALUE_ONLY_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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// The CompactHashtable is split into two arrays |
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// |
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// u4 buckets[num_buckets+1]; // bit[31,30]: type; bit[29-0]: offset |
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// u4 entries[<variable size>] |
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// |
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// The size of buckets[] is 'num_buckets + 1'. Each entry of |
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// buckets[] 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 end of the last |
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// bucket. |
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// |
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// There are two types of buckets, regular buckets and value_only buckets. The |
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// value_only 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 entries[]: |
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// u4 hash; /* symbol/string hash */ |
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// union { |
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// u4 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 value_only buckets, each entry has only the 4-byte 'offset' in the entries[]. |
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// |
|
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// Example -- note that the second bucket is a VALUE_ONLY_BUCKET_TYPE so the hash code |
|
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// is skipped. |
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// buckets[0, 4, 5, ....] |
|
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// | | | |
|
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// | | +---+ |
|
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// | | | |
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// | +----+ | |
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// v v v |
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// entries[H,O,H,O,O,H,O,H,O.....] |
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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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class SimpleCompactHashtable VALUE_OBJ_CLASS_SPEC { |
200 |
protected: |
|
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address _base_address; |
|
202 |
u4 _bucket_count; |
|
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u4 _entry_count; |
|
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u4* _buckets; |
|
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u4* _entries; |
|
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||
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public: |
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SimpleCompactHashtable() { |
|
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_entry_count = 0; |
|
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_bucket_count = 0; |
|
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_buckets = 0; |
|
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_entries = 0; |
|
213 |
} |
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||
215 |
void reset() { |
|
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_bucket_count = 0; |
|
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_entry_count = 0; |
|
218 |
_buckets = 0; |
|
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_entries = 0; |
|
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} |
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void init(address base_address, u4 entry_count, u4 bucket_count, u4* buckets, u4* entries) { |
|
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_base_address = base_address; |
|
224 |
_bucket_count = bucket_count; |
|
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_entry_count = entry_count; |
|
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_buckets = buckets; |
|
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_entries = entries; |
|
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} |
|
229 |
||
230 |
template <class I> inline void iterate(const I& iterator); |
|
231 |
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bool exists(u4 value); |
|
233 |
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// For reading from/writing to the CDS archive |
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void serialize(SerializeClosure* soc); |
|
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}; |
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template <class T, class N> class CompactHashtable : public SimpleCompactHashtable { |
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friend class VMStructs; |
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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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private: |
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u4 _type; |
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|
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inline Symbol* decode_entry(CompactHashtable<Symbol*, char>* const t, |
251 |
u4 offset, const char* name, int len); |
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|
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inline oop decode_entry(CompactHashtable<oop, char>* const t, |
254 |
u4 offset, const char* name, int len); |
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public: |
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CompactHashtable() : SimpleCompactHashtable() {} |
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|
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void set_type(CompactHashtableType type) { |
259 |
_type = (u4)type; |
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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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// iterate over symbols |
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void symbols_do(SymbolClosure *cl); |
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// iterate over strings |
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void oops_do(OopClosure* f); |
37995 | 270 |
|
271 |
// For reading from/writing to the CDS archive |
|
272 |
void serialize(SerializeClosure* soc); |
|
39713 | 273 |
|
274 |
uintx base_address() { |
|
275 |
return (uintx) _base_address; |
|
276 |
} |
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}; |
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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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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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303 |
}; |
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304 |
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void quit(const char* err, const char* msg); |
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306 |
|
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inline int remain() { |
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308 |
return (int)(_end - _p); |
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309 |
} |
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310 |
|
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void corrupted(const char *p, const char *msg); |
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312 |
|
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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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318 |
|
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bool skip_newline(); |
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int skip(char must_be_char); |
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321 |
void skip_past(char c); |
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void check_version(const char* ver); |
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323 |
|
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inline void get_num(char delim, int *num) { |
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const char* p = _p; |
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326 |
const char* end = _end; |
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u8 n = 0; |
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328 |
|
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329 |
while (p < end) { |
37995 | 330 |
char c = *p++; |
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331 |
if ('0' <= c && c <= '9') { |
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n = n * 10 + (c - '0'); |
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if (n > (u8)INT_MAX) { |
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corrupted(_p, "Num overflow"); |
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335 |
} |
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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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339 |
return; |
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340 |
} else { |
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// Not [0-9], not 'delim' |
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corrupted(_p, "Unrecognized format");; |
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343 |
} |
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} |
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|
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corrupted(_end, "Incorrect format"); |
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ShouldNotReachHere(); |
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348 |
} |
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|
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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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int scan_symbol_prefix(); |
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|
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jchar unescape(const char* from, const char* end, int count); |
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void get_utf8(char* utf8_buffer, int utf8_length); |
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static void put_utf8(outputStream* st, const char* utf8_string, int utf8_length); |
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}; |
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|
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/////////////////////////////////////////////////////////////////////// |
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361 |
// |
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// jcmd command support for symbol table and string table dumping: |
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// VM.symboltable -verbose: for dumping the symbol table |
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// VM.stringtable -verbose: for dumping the string table |
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// |
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class VM_DumpHashtable : public VM_Operation { |
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private: |
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outputStream* _out; |
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int _which; |
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bool _verbose; |
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public: |
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enum { |
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DumpSymbols = 1 << 0, |
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DumpStrings = 1 << 1, |
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DumpSysDict = 1 << 2 // not implemented yet |
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}; |
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VM_DumpHashtable(outputStream* out, int which, bool verbose) { |
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_out = out; |
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_which = which; |
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_verbose = verbose; |
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} |
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382 |
|
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virtual VMOp_Type type() const { return VMOp_DumpHashtable; } |
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384 |
|
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virtual void doit() { |
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switch (_which) { |
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case DumpSymbols: |
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SymbolTable::dump(_out, _verbose); |
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break; |
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case DumpStrings: |
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StringTable::dump(_out, _verbose); |
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break; |
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default: |
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ShouldNotReachHere(); |
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} |
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} |
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}; |
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398 |
|
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class SymboltableDCmd : public DCmdWithParser { |
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protected: |
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DCmdArgument<bool> _verbose; |
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public: |
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SymboltableDCmd(outputStream* output, bool heap); |
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static const char* name() { |
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return "VM.symboltable"; |
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} |
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static const char* description() { |
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return "Dump symbol table."; |
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} |
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static const char* impact() { |
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return "Medium: Depends on Java content."; |
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} |
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static const JavaPermission permission() { |
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JavaPermission p = {"java.lang.management.ManagementPermission", |
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"monitor", NULL}; |
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return p; |
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417 |
} |
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418 |
static int num_arguments(); |
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419 |
virtual void execute(DCmdSource source, TRAPS); |
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|
420 |
}; |
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|
421 |
|
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class StringtableDCmd : public DCmdWithParser { |
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|
423 |
protected: |
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DCmdArgument<bool> _verbose; |
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425 |
public: |
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StringtableDCmd(outputStream* output, bool heap); |
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427 |
static const char* name() { |
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428 |
return "VM.stringtable"; |
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|
429 |
} |
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430 |
static const char* description() { |
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431 |
return "Dump string table."; |
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432 |
} |
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433 |
static const char* impact() { |
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|
434 |
return "Medium: Depends on Java content."; |
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|
435 |
} |
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436 |
static const JavaPermission permission() { |
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437 |
JavaPermission p = {"java.lang.management.ManagementPermission", |
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|
438 |
"monitor", NULL}; |
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|
439 |
return p; |
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|
440 |
} |
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441 |
static int num_arguments(); |
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442 |
virtual void execute(DCmdSource source, TRAPS); |
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|
443 |
}; |
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444 |
|
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445 |
#endif // SHARE_VM_CLASSFILE_COMPACTHASHTABLE_HPP |