truffle: src/share/vm/oops/symbol.hpp annotate

annotate src/share/vm/oops/symbol.hpp @ 2426:1d1603768966

7010070: Update all 2010 Oracle-changed OpenJDK files to have the proper copyright dates - second pass Summary: Update the copyright to be 2010 on all changed files in OpenJDK Reviewed-by: ohair

author	trims
date	Tue, 05 Apr 2011 14:12:31 -0700
parents	3582bf76420e
children	fc9d8850ab8b

rev	line source
0 a61af66fc99e Initial load duke parents: diff changeset	1 /*
2426 1d1603768966 7010070: Update all 2010 Oracle-changed OpenJDK files to have the proper copyright dates - second pass trims parents: 2177 diff changeset	2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
0 a61af66fc99e Initial load duke parents: diff changeset	3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
a61af66fc99e Initial load duke parents: diff changeset	4 *
a61af66fc99e Initial load duke parents: diff changeset	5 * This code is free software; you can redistribute it and/or modify it
a61af66fc99e Initial load duke parents: diff changeset	6 * under the terms of the GNU General Public License version 2 only, as
a61af66fc99e Initial load duke parents: diff changeset	7 * published by the Free Software Foundation.
a61af66fc99e Initial load duke parents: diff changeset	8 *
a61af66fc99e Initial load duke parents: diff changeset	9 * This code is distributed in the hope that it will be useful, but WITHOUT
a61af66fc99e Initial load duke parents: diff changeset	10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
a61af66fc99e Initial load duke parents: diff changeset	11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
a61af66fc99e Initial load duke parents: diff changeset	12 * version 2 for more details (a copy is included in the LICENSE file that
a61af66fc99e Initial load duke parents: diff changeset	13 * accompanied this code).
a61af66fc99e Initial load duke parents: diff changeset	14 *
a61af66fc99e Initial load duke parents: diff changeset	15 * You should have received a copy of the GNU General Public License version
a61af66fc99e Initial load duke parents: diff changeset	16 * 2 along with this work; if not, write to the Free Software Foundation,
a61af66fc99e Initial load duke parents: diff changeset	17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
a61af66fc99e Initial load duke parents: diff changeset	18 *
1552 c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1138 diff changeset	19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1138 diff changeset	20 * or visit www.oracle.com if you need additional information or have any
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1138 diff changeset	21 * questions.
0 a61af66fc99e Initial load duke parents: diff changeset	22 *
a61af66fc99e Initial load duke parents: diff changeset	23 */
a61af66fc99e Initial load duke parents: diff changeset	24
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	25 #ifndef SHARE_VM_OOPS_SYMBOL_HPP
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	26 #define SHARE_VM_OOPS_SYMBOL_HPP
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	27
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	28 #include "utilities/utf8.hpp"
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	29 #include "memory/allocation.hpp"
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	30
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	31 // A Symbol is a canonicalized string.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	32 // All Symbols reside in global SymbolTable and are reference counted.
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1552 diff changeset	33
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	34 // Reference counting
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	35 //
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	36 // All Symbols are allocated and added to the SymbolTable.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	37 // When a class is unloaded, the reference counts of the Symbol pointers in
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	38 // the ConstantPool and in instanceKlass (see release_C_heap_structures) are
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	39 // decremented. When the reference count for a Symbol goes to 0, the garbage
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	40 // collector can free the Symbol and remove it from the SymbolTable.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	41 //
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	42 // 0) Symbols need to be reference counted when a pointer to the Symbol is
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	43 // saved in persistent storage. This does not include the pointer
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	44 // in the SymbolTable bucket (the _literal field in HashtableEntry)
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	45 // that points to the Symbol. All other stores of a Symbol*
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	46 // to a field of a persistent variable (e.g., the _name filed in
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	47 // FieldAccessInfo or _ptr in a CPSlot) is reference counted.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	48 //
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	49 // 1) The lookup of a "name" in the SymbolTable either creates a Symbol F for
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	50 // "name" and returns a pointer to F or finds a pre-existing Symbol F for
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	51 // "name" and returns a pointer to it. In both cases the reference count for F
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	52 // is incremented under the assumption that a pointer to F will be created from
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	53 // the return value. Thus the increment of the reference count is on the lookup
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	54 // and not on the assignment to the new Symbol*. That is
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	55 // Symbol* G = lookup()
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	56 // ^ increment on lookup()
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	57 // and not
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	58 // Symbol* G = lookup()
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	59 // ^ increment on assignmnet
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	60 // The reference count must be decremented manually when the copy of the
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	61 // pointer G is destroyed.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	62 //
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	63 // 2) For a local Symbol* A that is a copy of an existing Symbol* B, the
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	64 // reference counting is elided when the scope of B is greater than the scope
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	65 // of A. For example, in the code fragment
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	66 // below "klass" is passed as a parameter to the method. Symbol* "kn"
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	67 // is a copy of the name in "klass".
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	68 //
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	69 // Symbol* kn = klass->name();
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	70 // unsigned int d_hash = dictionary()->compute_hash(kn, class_loader);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	71 //
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	72 // The scope of "klass" is greater than the scope of "kn" so the reference
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	73 // counting for "kn" is elided.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	74 //
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	75 // Symbol* copied from ConstantPool entries are good candidates for reference
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	76 // counting elision. The ConstantPool entries for a class C exist until C is
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	77 // unloaded. If a Symbol* is copied out of the ConstantPool into Symbol* X,
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	78 // the Symbol* in the ConstantPool will in general out live X so the reference
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	79 // counting on X can be elided.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	80 //
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	81 // For cases where the scope of A is not greater than the scope of B,
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	82 // the reference counting is explicitly done. See ciSymbol,
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	83 // ResolutionErrorEntry and ClassVerifier for examples.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	84 //
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	85 // 3) When a Symbol K is created for temporary use, generally for substrings of
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	86 // an existing symbol or to create a new symbol, assign it to a
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	87 // TempNewSymbol. The SymbolTable methods new_symbol(), lookup()
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	88 // and probe() all potentially return a pointer to a new Symbol.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	89 // The allocation (or lookup) of K increments the reference count for K
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	90 // and the destructor decrements the reference count.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	91 //
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	92 // Another example of TempNewSymbol usage is parsed_name used in
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	93 // ClassFileParser::parseClassFile() where parsed_name is used in the cleanup
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	94 // after a failed attempt to load a class. Here parsed_name is a
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	95 // TempNewSymbol (passed in as a parameter) so the reference count on its symbol
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	96 // will be decremented when it goes out of scope.
0 a61af66fc99e Initial load duke parents: diff changeset	97
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	98 class Symbol : public CHeapObj {
0 a61af66fc99e Initial load duke parents: diff changeset	99 friend class VMStructs;
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	100 friend class SymbolTable;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	101 friend class MoveSymbols;
0 a61af66fc99e Initial load duke parents: diff changeset	102 private:
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	103 volatile int _refcount;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	104 int _identity_hash;
0 a61af66fc99e Initial load duke parents: diff changeset	105 unsigned short _length; // number of UTF8 characters in the symbol
a61af66fc99e Initial load duke parents: diff changeset	106 jbyte _body[1];
a61af66fc99e Initial load duke parents: diff changeset	107
a61af66fc99e Initial load duke parents: diff changeset	108 enum {
a61af66fc99e Initial load duke parents: diff changeset	109 // max_symbol_length is constrained by type of _length
a61af66fc99e Initial load duke parents: diff changeset	110 max_symbol_length = (1 << 16) -1
a61af66fc99e Initial load duke parents: diff changeset	111 };
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	112
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	113 static int object_size(int length) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	114 size_t size = heap_word_size(sizeof(Symbol) + length);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	115 return align_object_size(size);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	116 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	117
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	118 void byte_at_put(int index, int value) {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	119 assert(index >=0 && index < _length, "symbol index overflow");
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	120 _body[index] = value;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	121 }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	122
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	123 Symbol(const u1* name, int length);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	124 void* operator new(size_t size, int len);
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	125
0 a61af66fc99e Initial load duke parents: diff changeset	126 public:
a61af66fc99e Initial load duke parents: diff changeset	127 // Low-level access (used with care, since not GC-safe)
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	128 const jbyte* base() const { return &_body[0]; }
0 a61af66fc99e Initial load duke parents: diff changeset	129
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	130 int object_size() { return object_size(utf8_length()); }
0 a61af66fc99e Initial load duke parents: diff changeset	131
a61af66fc99e Initial load duke parents: diff changeset	132 // Returns the largest size symbol we can safely hold.
a61af66fc99e Initial load duke parents: diff changeset	133 static int max_length() {
a61af66fc99e Initial load duke parents: diff changeset	134 return max_symbol_length;
a61af66fc99e Initial load duke parents: diff changeset	135 }
a61af66fc99e Initial load duke parents: diff changeset	136
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	137 int identity_hash() {
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	138 return _identity_hash;
0 a61af66fc99e Initial load duke parents: diff changeset	139 }
a61af66fc99e Initial load duke parents: diff changeset	140
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	141 // Reference counting. See comments above this class for when to use.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	142 int refcount() const { return _refcount; }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	143 void increment_refcount();
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	144 void decrement_refcount();
0 a61af66fc99e Initial load duke parents: diff changeset	145
a61af66fc99e Initial load duke parents: diff changeset	146 int byte_at(int index) const {
a61af66fc99e Initial load duke parents: diff changeset	147 assert(index >=0 && index < _length, "symbol index overflow");
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	148 return base()[index];
0 a61af66fc99e Initial load duke parents: diff changeset	149 }
a61af66fc99e Initial load duke parents: diff changeset	150
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	151 const jbyte* bytes() const { return base(); }
0 a61af66fc99e Initial load duke parents: diff changeset	152
a61af66fc99e Initial load duke parents: diff changeset	153 int utf8_length() const { return _length; }
a61af66fc99e Initial load duke parents: diff changeset	154
1138 dd57230ba8fe 6893268: additional dynamic language related optimizations in C2 twisti parents: 0 diff changeset	155 // Compares the symbol with a string.
0 a61af66fc99e Initial load duke parents: diff changeset	156 bool equals(const char* str, int len) const;
1138 dd57230ba8fe 6893268: additional dynamic language related optimizations in C2 twisti parents: 0 diff changeset	157 bool equals(const char* str) const { return equals(str, (int) strlen(str)); }
dd57230ba8fe 6893268: additional dynamic language related optimizations in C2 twisti parents: 0 diff changeset	158
dd57230ba8fe 6893268: additional dynamic language related optimizations in C2 twisti parents: 0 diff changeset	159 // Tests if the symbol starts with the given prefix.
dd57230ba8fe 6893268: additional dynamic language related optimizations in C2 twisti parents: 0 diff changeset	160 bool starts_with(const char* prefix, int len) const;
dd57230ba8fe 6893268: additional dynamic language related optimizations in C2 twisti parents: 0 diff changeset	161 bool starts_with(const char* prefix) const {
dd57230ba8fe 6893268: additional dynamic language related optimizations in C2 twisti parents: 0 diff changeset	162 return starts_with(prefix, (int) strlen(prefix));
dd57230ba8fe 6893268: additional dynamic language related optimizations in C2 twisti parents: 0 diff changeset	163 }
dd57230ba8fe 6893268: additional dynamic language related optimizations in C2 twisti parents: 0 diff changeset	164
dd57230ba8fe 6893268: additional dynamic language related optimizations in C2 twisti parents: 0 diff changeset	165 // Tests if the symbol starts with the given prefix.
dd57230ba8fe 6893268: additional dynamic language related optimizations in C2 twisti parents: 0 diff changeset	166 int index_of_at(int i, const char* str, int len) const;
dd57230ba8fe 6893268: additional dynamic language related optimizations in C2 twisti parents: 0 diff changeset	167 int index_of_at(int i, const char* str) const {
dd57230ba8fe 6893268: additional dynamic language related optimizations in C2 twisti parents: 0 diff changeset	168 return index_of_at(i, str, (int) strlen(str));
dd57230ba8fe 6893268: additional dynamic language related optimizations in C2 twisti parents: 0 diff changeset	169 }
0 a61af66fc99e Initial load duke parents: diff changeset	170
a61af66fc99e Initial load duke parents: diff changeset	171 // Three-way compare for sorting; returns -1/0/1 if receiver is </==/> than arg
a61af66fc99e Initial load duke parents: diff changeset	172 // note that the ordering is not alfabetical
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	173 inline int fast_compare(Symbol* other) const;
0 a61af66fc99e Initial load duke parents: diff changeset	174
a61af66fc99e Initial load duke parents: diff changeset	175 // Returns receiver converted to null-terminated UTF-8 string; string is
a61af66fc99e Initial load duke parents: diff changeset	176 // allocated in resource area, or in the char buffer provided by caller.
a61af66fc99e Initial load duke parents: diff changeset	177 char* as_C_string() const;
a61af66fc99e Initial load duke parents: diff changeset	178 char* as_C_string(char* buf, int size) const;
a61af66fc99e Initial load duke parents: diff changeset	179 // Use buf if needed buffer length is <= size.
a61af66fc99e Initial load duke parents: diff changeset	180 char* as_C_string_flexible_buffer(Thread* t, char* buf, int size) const;
a61af66fc99e Initial load duke parents: diff changeset	181
a61af66fc99e Initial load duke parents: diff changeset	182
a61af66fc99e Initial load duke parents: diff changeset	183 // Returns a null terminated utf8 string in a resource array
a61af66fc99e Initial load duke parents: diff changeset	184 char* as_utf8() const { return as_C_string(); }
a61af66fc99e Initial load duke parents: diff changeset	185 char* as_utf8_flexible_buffer(Thread* t, char* buf, int size) const {
a61af66fc99e Initial load duke parents: diff changeset	186 return as_C_string_flexible_buffer(t, buf, size);
a61af66fc99e Initial load duke parents: diff changeset	187 }
a61af66fc99e Initial load duke parents: diff changeset	188
a61af66fc99e Initial load duke parents: diff changeset	189 jchar* as_unicode(int& length) const;
a61af66fc99e Initial load duke parents: diff changeset	190
a61af66fc99e Initial load duke parents: diff changeset	191 // Treating this symbol as a class name, returns the Java name for the class.
a61af66fc99e Initial load duke parents: diff changeset	192 // String is allocated in resource area if buffer is not provided.
a61af66fc99e Initial load duke parents: diff changeset	193 // See Klass::external_name()
a61af66fc99e Initial load duke parents: diff changeset	194 const char* as_klass_external_name() const;
a61af66fc99e Initial load duke parents: diff changeset	195 const char* as_klass_external_name(char* buf, int size) const;
a61af66fc99e Initial load duke parents: diff changeset	196
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	197 // Printing
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	198 void print_symbol_on(outputStream* st = NULL) const;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	199 void print_on(outputStream* st) const; // First level print
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	200 void print_value_on(outputStream* st) const; // Second level print.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	201
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	202 // printing on default output stream
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	203 void print() { print_on(tty); }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	204 void print_value() { print_value_on(tty); }
0 a61af66fc99e Initial load duke parents: diff changeset	205
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	206 #ifndef PRODUCT
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	207 // Empty constructor to create a dummy symbol object on stack
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	208 // only for getting its vtable pointer.
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	209 Symbol() { }
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	210
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	211 static int _total_count;
3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	212 #endif
0 a61af66fc99e Initial load duke parents: diff changeset	213 };
a61af66fc99e Initial load duke parents: diff changeset	214
a61af66fc99e Initial load duke parents: diff changeset	215 // Note: this comparison is used for vtable sorting only; it doesn't matter
a61af66fc99e Initial load duke parents: diff changeset	216 // what order it defines, as long as it is a total, time-invariant order
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	217 // Since Symbol*s are in C_HEAP, their relative order in memory never changes,
0 a61af66fc99e Initial load duke parents: diff changeset	218 // so use address comparison for speed
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	219 int Symbol::fast_compare(Symbol* other) const {
0 a61af66fc99e Initial load duke parents: diff changeset	220 return (((uintptr_t)this < (uintptr_t)other) ? -1
a61af66fc99e Initial load duke parents: diff changeset	221 : ((uintptr_t)this == (uintptr_t) other) ? 0 : 1);
a61af66fc99e Initial load duke parents: diff changeset	222 }
2177 3582bf76420e 6990754: Use native memory and reference counting to implement SymbolTable coleenp parents: 1972 diff changeset	223 #endif // SHARE_VM_OOPS_SYMBOL_HPP

Mercurial > hg > truffle

annotate src/share/vm/oops/symbol.hpp @ 2426:1d1603768966