Mercurial > hg > truffle
annotate src/share/vm/oops/symbolOop.hpp @ 2002:ac637b7220d1
6985015: C1 needs to support compressed oops
Summary: This change implements compressed oops for C1 for x64 and sparc. The changes are mostly on the codegen level, with a few exceptions when we do access things outside of the heap that are uncompressed from the IR. Compressed oops are now also enabled with tiered.
Reviewed-by: twisti, kvn, never, phh
| author | iveresov |
|---|---|
| date | Tue, 30 Nov 2010 23:23:40 -0800 |
| parents | f95d63e2154a |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_OOPS_SYMBOLOOP_HPP |
| 26 #define SHARE_VM_OOPS_SYMBOLOOP_HPP | |
| 27 | |
| 28 #include "oops/typeArrayOop.hpp" | |
| 29 #include "utilities/utf8.hpp" | |
| 30 | |
| 0 | 31 // A symbolOop is a canonicalized string. |
| 32 // All symbolOops reside in global symbolTable. | |
| 33 // See oopFactory::new_symbol for how to allocate a symbolOop | |
| 34 | |
| 35 class symbolOopDesc : public oopDesc { | |
| 36 friend class VMStructs; | |
| 37 private: | |
| 38 unsigned short _length; // number of UTF8 characters in the symbol | |
| 39 jbyte _body[1]; | |
| 40 | |
| 41 enum { | |
| 42 // max_symbol_length is constrained by type of _length | |
| 43 max_symbol_length = (1 << 16) -1 | |
| 44 }; | |
| 45 public: | |
| 46 | |
| 47 // Low-level access (used with care, since not GC-safe) | |
| 48 jbyte* base() { return &_body[0]; } | |
| 49 | |
| 50 | |
| 51 // Returns the largest size symbol we can safely hold. | |
| 52 static int max_length() { | |
| 53 return max_symbol_length; | |
| 54 } | |
| 55 | |
| 56 static int object_size(int length) { | |
| 57 int size = header_size() + (sizeof(unsigned short) + length + HeapWordSize - 1) / HeapWordSize; | |
| 58 return align_object_size(size); | |
| 59 } | |
| 60 | |
| 61 int object_size() { return object_size(utf8_length()); } | |
| 62 | |
| 63 int byte_at(int index) const { | |
| 64 assert(index >=0 && index < _length, "symbol index overflow"); | |
| 65 return ((symbolOopDesc*)this)->base()[index]; | |
| 66 } | |
| 67 | |
| 68 void byte_at_put(int index, int value) { | |
| 69 assert(index >=0 && index < _length, "symbol index overflow"); | |
| 70 ((symbolOopDesc*)this)->base()[index] = value; | |
| 71 } | |
| 72 | |
| 73 jbyte* bytes() { return base(); } | |
| 74 | |
| 75 int utf8_length() const { return _length; } | |
| 76 | |
| 77 void set_utf8_length(int len) { _length = len; } | |
| 78 | |
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79 // Compares the symbol with a string. |
| 0 | 80 bool equals(const char* str, int len) const; |
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81 bool equals(const char* str) const { return equals(str, (int) strlen(str)); } |
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82 |
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83 // Tests if the symbol starts with the given prefix. |
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84 bool starts_with(const char* prefix, int len) const; |
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85 bool starts_with(const char* prefix) const { |
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86 return starts_with(prefix, (int) strlen(prefix)); |
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87 } |
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88 |
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89 // Tests if the symbol starts with the given prefix. |
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90 int index_of_at(int i, const char* str, int len) const; |
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91 int index_of_at(int i, const char* str) const { |
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92 return index_of_at(i, str, (int) strlen(str)); |
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93 } |
| 0 | 94 |
| 95 // Three-way compare for sorting; returns -1/0/1 if receiver is </==/> than arg | |
| 96 // note that the ordering is not alfabetical | |
| 97 inline int fast_compare(symbolOop other) const; | |
| 98 | |
| 99 // Returns receiver converted to null-terminated UTF-8 string; string is | |
| 100 // allocated in resource area, or in the char buffer provided by caller. | |
| 101 char* as_C_string() const; | |
| 102 char* as_C_string(char* buf, int size) const; | |
| 103 // Use buf if needed buffer length is <= size. | |
| 104 char* as_C_string_flexible_buffer(Thread* t, char* buf, int size) const; | |
| 105 | |
| 106 | |
| 107 // Returns a null terminated utf8 string in a resource array | |
| 108 char* as_utf8() const { return as_C_string(); } | |
| 109 char* as_utf8_flexible_buffer(Thread* t, char* buf, int size) const { | |
| 110 return as_C_string_flexible_buffer(t, buf, size); | |
| 111 } | |
| 112 | |
| 113 jchar* as_unicode(int& length) const; | |
| 114 | |
| 115 // Treating this symbol as a class name, returns the Java name for the class. | |
| 116 // String is allocated in resource area if buffer is not provided. | |
| 117 // See Klass::external_name() | |
| 118 const char* as_klass_external_name() const; | |
| 119 const char* as_klass_external_name(char* buf, int size) const; | |
| 120 | |
| 121 bool object_is_parsable() const { | |
| 122 return (utf8_length() > 0 || (oop)this == Universe::emptySymbol()); | |
| 123 } | |
| 124 | |
| 125 // Printing | |
| 126 void print_symbol_on(outputStream* st = NULL); | |
| 127 }; | |
| 128 | |
| 129 | |
| 130 // Note: this comparison is used for vtable sorting only; it doesn't matter | |
| 131 // what order it defines, as long as it is a total, time-invariant order | |
| 132 // Since symbolOops are in permSpace, their relative order in memory never changes, | |
| 133 // so use address comparison for speed | |
| 134 int symbolOopDesc::fast_compare(symbolOop other) const { | |
| 135 return (((uintptr_t)this < (uintptr_t)other) ? -1 | |
| 136 : ((uintptr_t)this == (uintptr_t) other) ? 0 : 1); | |
| 137 } | |
| 1972 | 138 |
| 139 #endif // SHARE_VM_OOPS_SYMBOLOOP_HPP |