--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/classfile/symbolTable.hpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,213 @@
+/*
+ * Copyright 1997-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+// The symbol table holds all symbolOops and corresponding interned strings.
+// symbolOops and literal strings should be canonicalized.
+//
+// The interned strings are created lazily.
+//
+// It is implemented as an open hash table with a fixed number of buckets.
+//
+// %note:
+// - symbolTableEntrys are allocated in blocks to reduce the space overhead.
+
+class BoolObjectClosure;
+
+
+class SymbolTable : public Hashtable {
+ friend class VMStructs;
+
+private:
+ // The symbol table
+ static SymbolTable* _the_table;
+
+ // Adding elements
+ symbolOop basic_add(int index, u1* name, int len,
+ unsigned int hashValue, TRAPS);
+ bool basic_add(constantPoolHandle cp, int names_count,
+ const char** names, int* lengths, int* cp_indices,
+ unsigned int* hashValues, TRAPS);
+
+ // Table size
+ enum {
+ symbol_table_size = 20011
+ };
+
+ symbolOop lookup(int index, const char* name, int len, unsigned int hash);
+
+ SymbolTable()
+ : Hashtable(symbol_table_size, sizeof (HashtableEntry)) {}
+
+ SymbolTable(HashtableBucket* t, int number_of_entries)
+ : Hashtable(symbol_table_size, sizeof (HashtableEntry), t,
+ number_of_entries) {}
+
+
+public:
+ enum {
+ symbol_alloc_batch_size = 8
+ };
+
+ // The symbol table
+ static SymbolTable* the_table() { return _the_table; }
+
+ static void create_table() {
+ assert(_the_table == NULL, "One symbol table allowed.");
+ _the_table = new SymbolTable();
+ }
+
+ static void create_table(HashtableBucket* t, int length,
+ int number_of_entries) {
+ assert(_the_table == NULL, "One symbol table allowed.");
+ assert(length == symbol_table_size * sizeof(HashtableBucket),
+ "bad shared symbol size.");
+ _the_table = new SymbolTable(t, number_of_entries);
+ }
+
+ static symbolOop lookup(const char* name, int len, TRAPS);
+ // lookup only, won't add. Also calculate hash.
+ static symbolOop lookup_only(const char* name, int len, unsigned int& hash);
+ // Only copy to C string to be added if lookup failed.
+ static symbolOop lookup(symbolHandle sym, int begin, int end, TRAPS);
+
+ static void add(constantPoolHandle cp, int names_count,
+ const char** names, int* lengths, int* cp_indices,
+ unsigned int* hashValues, TRAPS);
+
+ // GC support
+ // Delete pointers to otherwise-unreachable objects.
+ static void unlink(BoolObjectClosure* cl) {
+ the_table()->Hashtable::unlink(cl);
+ }
+
+ // Invoke "f->do_oop" on the locations of all oops in the table.
+ static void oops_do(OopClosure* f) {
+ the_table()->Hashtable::oops_do(f);
+ }
+
+ // Symbol lookup
+ static symbolOop lookup(int index, const char* name, int len, TRAPS);
+
+ // Needed for preloading classes in signatures when compiling.
+ // Returns the symbol is already present in symbol table, otherwise
+ // NULL. NO ALLOCATION IS GUARANTEED!
+ static symbolOop probe(const char* name, int len);
+
+ // Histogram
+ static void print_histogram() PRODUCT_RETURN;
+
+ // Debugging
+ static void verify();
+
+ // Sharing
+ static void copy_buckets(char** top, char*end) {
+ the_table()->Hashtable::copy_buckets(top, end);
+ }
+ static void copy_table(char** top, char*end) {
+ the_table()->Hashtable::copy_table(top, end);
+ }
+ static void reverse(void* boundary = NULL) {
+ ((Hashtable*)the_table())->reverse(boundary);
+ }
+};
+
+
+class StringTable : public Hashtable {
+ friend class VMStructs;
+
+private:
+ // The string table
+ static StringTable* _the_table;
+
+ static oop intern(Handle string_or_null, jchar* chars, int length, TRAPS);
+ oop basic_add(int index, Handle string_or_null, jchar* name, int len,
+ unsigned int hashValue, TRAPS);
+
+ // Table size
+ enum {
+ string_table_size = 1009
+ };
+
+ oop lookup(int index, jchar* chars, int length, unsigned int hashValue);
+
+ StringTable() : Hashtable(string_table_size, sizeof (HashtableEntry)) {}
+
+ StringTable(HashtableBucket* t, int number_of_entries)
+ : Hashtable(string_table_size, sizeof (HashtableEntry), t,
+ number_of_entries) {}
+
+public:
+ // The string table
+ static StringTable* the_table() { return _the_table; }
+
+ static void create_table() {
+ assert(_the_table == NULL, "One string table allowed.");
+ _the_table = new StringTable();
+ }
+
+ static void create_table(HashtableBucket* t, int length,
+ int number_of_entries) {
+ assert(_the_table == NULL, "One string table allowed.");
+ assert(length == string_table_size * sizeof(HashtableBucket),
+ "bad shared string size.");
+ _the_table = new StringTable(t, number_of_entries);
+ }
+
+
+ static int hash_string(jchar* s, int len);
+
+
+ // GC support
+ // Delete pointers to otherwise-unreachable objects.
+ static void unlink(BoolObjectClosure* cl) {
+ the_table()->Hashtable::unlink(cl);
+ }
+
+ // Invoke "f->do_oop" on the locations of all oops in the table.
+ static void oops_do(OopClosure* f) {
+ the_table()->Hashtable::oops_do(f);
+ }
+
+ // Probing
+ static oop lookup(symbolOop symbol);
+
+ // Interning
+ static oop intern(symbolOop symbol, TRAPS);
+ static oop intern(oop string, TRAPS);
+ static oop intern(const char *utf8_string, TRAPS);
+
+ // Debugging
+ static void verify();
+
+ // Sharing
+ static void copy_buckets(char** top, char*end) {
+ the_table()->Hashtable::copy_buckets(top, end);
+ }
+ static void copy_table(char** top, char*end) {
+ the_table()->Hashtable::copy_table(top, end);
+ }
+ static void reverse() {
+ ((BasicHashtable*)the_table())->reverse();
+ }
+};