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comparison src/share/vm/oops/constMethodOop.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 2003-2006 Sun Microsystems, Inc. All Rights Reserved.
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 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // An constMethodOop represents portions of a Java method which
26 // do not vary.
27 //
28 // Memory layout (each line represents a word). Note that most
29 // applications load thousands of methods, so keeping the size of this
30 // structure small has a big impact on footprint.
31 //
32 // |------------------------------------------------------|
33 // | header |
34 // | klass |
35 // |------------------------------------------------------|
36 // | fingerprint 1 |
37 // | fingerprint 2 |
38 // | method (oop) |
39 // | stackmap_data (oop) |
40 // | exception_table (oop) |
41 // | constMethod_size |
42 // | interp_kind | flags | code_size |
43 // | name index | signature index |
44 // | method_idnum | generic_signature_index |
45 // |------------------------------------------------------|
46 // | |
47 // | byte codes |
48 // | |
49 // |------------------------------------------------------|
50 // | compressed linenumber table |
51 // | (see class CompressedLineNumberReadStream) |
52 // | (note that length is unknown until decompressed) |
53 // | (access flags bit tells whether table is present) |
54 // | (indexed from start of constMethodOop) |
55 // | (elements not necessarily sorted!) |
56 // |------------------------------------------------------|
57 // | localvariable table elements + length (length last) |
58 // | (length is u2, elements are 6-tuples of u2) |
59 // | (see class LocalVariableTableElement) |
60 // | (access flags bit tells whether table is present) |
61 // | (indexed from end of contMethodOop) |
62 // |------------------------------------------------------|
63 // | checked exceptions elements + length (length last) |
64 // | (length is u2, elements are u2) |
65 // | (see class CheckedExceptionElement) |
66 // | (access flags bit tells whether table is present) |
67 // | (indexed from end of constMethodOop) |
68 // |------------------------------------------------------|
69
70
71 // Utitily class decribing elements in checked exceptions table inlined in methodOop.
72 class CheckedExceptionElement VALUE_OBJ_CLASS_SPEC {
73 public:
74 u2 class_cp_index;
75 };
76
77
78 // Utitily class decribing elements in local variable table inlined in methodOop.
79 class LocalVariableTableElement VALUE_OBJ_CLASS_SPEC {
80 public:
81 u2 start_bci;
82 u2 length;
83 u2 name_cp_index;
84 u2 descriptor_cp_index;
85 u2 signature_cp_index;
86 u2 slot;
87 };
88
89
90 class constMethodOopDesc : public oopDesc {
91 friend class constMethodKlass;
92 friend class VMStructs;
93 private:
94 enum {
95 _has_linenumber_table = 1,
96 _has_checked_exceptions = 2,
97 _has_localvariable_table = 4
98 };
99
100 // Bit vector of signature
101 // Callers interpret 0=not initialized yet and
102 // -1=too many args to fix, must parse the slow way.
103 // The real initial value is special to account for nonatomicity of 64 bit
104 // loads and stores. This value may updated and read without a lock by
105 // multiple threads, so is volatile.
106 volatile uint64_t _fingerprint;
107
108 public:
109 oop* oop_block_beg() const { return adr_method(); }
110 oop* oop_block_end() const { return adr_exception_table() + 1; }
111
112 private:
113 //
114 // The oop block. See comment in klass.hpp before making changes.
115 //
116
117 // Backpointer to non-const methodOop (needed for some JVMTI operations)
118 methodOop _method;
119
120 // Raw stackmap data for the method
121 typeArrayOop _stackmap_data;
122
123 // The exception handler table. 4-tuples of ints [start_pc, end_pc,
124 // handler_pc, catch_type index] For methods with no exceptions the
125 // table is pointing to Universe::the_empty_int_array
126 typeArrayOop _exception_table;
127
128 //
129 // End of the oop block.
130 //
131
132 int _constMethod_size;
133 jbyte _interpreter_kind;
134 jbyte _flags;
135
136 // Size of Java bytecodes allocated immediately after methodOop.
137 u2 _code_size;
138 u2 _name_index; // Method name (index in constant pool)
139 u2 _signature_index; // Method signature (index in constant pool)
140 u2 _method_idnum; // unique identification number for the method within the class
141 // initially corresponds to the index into the methods array.
142 // but this may change with redefinition
143 u2 _generic_signature_index; // Generic signature (index in constant pool, 0 if absent)
144
145 public:
146 // Inlined tables
147 void set_inlined_tables_length(int checked_exceptions_len,
148 int compressed_line_number_size,
149 int localvariable_table_len);
150
151 bool has_linenumber_table() const
152 { return (_flags & _has_linenumber_table) != 0; }
153
154 bool has_checked_exceptions() const
155 { return (_flags & _has_checked_exceptions) != 0; }
156
157 bool has_localvariable_table() const
158 { return (_flags & _has_localvariable_table) != 0; }
159
160 void set_interpreter_kind(int kind) { _interpreter_kind = kind; }
161 int interpreter_kind(void) const { return _interpreter_kind; }
162
163 // backpointer to non-const methodOop
164 methodOop method() const { return _method; }
165 void set_method(methodOop m) { oop_store_without_check((oop*)&_method, (oop) m); }
166
167
168 // stackmap table data
169 typeArrayOop stackmap_data() const { return _stackmap_data; }
170 void set_stackmap_data(typeArrayOop sd) {
171 oop_store_without_check((oop*)&_stackmap_data, (oop)sd);
172 }
173 bool has_stackmap_table() const { return _stackmap_data != NULL; }
174
175 // exception handler table
176 typeArrayOop exception_table() const { return _exception_table; }
177 void set_exception_table(typeArrayOop e) { oop_store_without_check((oop*) &_exception_table, (oop) e); }
178 bool has_exception_handler() const { return exception_table() != NULL && exception_table()->length() > 0; }
179
180 void init_fingerprint() {
181 const uint64_t initval = CONST64(0x8000000000000000);
182 _fingerprint = initval;
183 }
184
185 uint64_t fingerprint() const {
186 // Since reads aren't atomic for 64 bits, if any of the high or low order
187 // word is the initial value, return 0. See init_fingerprint for initval.
188 uint high_fp = (uint)(_fingerprint >> 32);
189 if ((int) _fingerprint == 0 || high_fp == 0x80000000) {
190 return 0L;
191 } else {
192 return _fingerprint;
193 }
194 }
195
196 uint64_t set_fingerprint(uint64_t new_fingerprint) {
197 #ifdef ASSERT
198 // Assert only valid if complete/valid 64 bit _fingerprint value is read.
199 uint64_t oldfp = fingerprint();
200 #endif // ASSERT
201 _fingerprint = new_fingerprint;
202 assert(oldfp == 0L || new_fingerprint == oldfp,
203 "fingerprint cannot change");
204 assert(((new_fingerprint >> 32) != 0x80000000) && (int)new_fingerprint !=0,
205 "fingerprint should call init to set initial value");
206 return new_fingerprint;
207 }
208
209 // name
210 int name_index() const { return _name_index; }
211 void set_name_index(int index) { _name_index = index; }
212
213 // signature
214 int signature_index() const { return _signature_index; }
215 void set_signature_index(int index) { _signature_index = index; }
216
217 // generics support
218 int generic_signature_index() const { return _generic_signature_index; }
219 void set_generic_signature_index(int index) { _generic_signature_index = index; }
220
221 // Sizing
222 static int header_size() {
223 return sizeof(constMethodOopDesc)/HeapWordSize;
224 }
225
226 // Object size needed
227 static int object_size(int code_size, int compressed_line_number_size,
228 int local_variable_table_length,
229 int checked_exceptions_length);
230
231 int object_size() const { return _constMethod_size; }
232 void set_constMethod_size(int size) { _constMethod_size = size; }
233 // Is object parsable by gc
234 bool object_is_parsable() { return object_size() > 0; }
235
236 // code size
237 int code_size() const { return _code_size; }
238 void set_code_size(int size) {
239 assert(max_method_code_size < (1 << 16),
240 "u2 is too small to hold method code size in general");
241 assert(0 <= size && size <= max_method_code_size, "invalid code size");
242 _code_size = size;
243 }
244
245 // linenumber table - note that length is unknown until decompression,
246 // see class CompressedLineNumberReadStream.
247 u_char* compressed_linenumber_table() const; // not preserved by gc
248 u2* checked_exceptions_length_addr() const;
249 u2* localvariable_table_length_addr() const;
250
251 // checked exceptions
252 int checked_exceptions_length() const;
253 CheckedExceptionElement* checked_exceptions_start() const;
254
255 // localvariable table
256 int localvariable_table_length() const;
257 LocalVariableTableElement* localvariable_table_start() const;
258
259 // byte codes
260 address code_base() const { return (address) (this+1); }
261 address code_end() const { return code_base() + code_size(); }
262 bool contains(address bcp) const { return code_base() <= bcp
263 && bcp < code_end(); }
264 // Offset to bytecodes
265 static ByteSize codes_offset()
266 { return in_ByteSize(sizeof(constMethodOopDesc)); }
267
268 // interpreter support
269 static ByteSize exception_table_offset()
270 { return byte_offset_of(constMethodOopDesc, _exception_table); }
271
272 // Garbage collection support
273 oop* adr_method() const { return (oop*)&_method; }
274 oop* adr_stackmap_data() const { return (oop*)&_stackmap_data; }
275 oop* adr_exception_table() const { return (oop*)&_exception_table; }
276
277 // Unique id for the method
278 static const u2 MAX_IDNUM;
279 static const u2 UNSET_IDNUM;
280 u2 method_idnum() const { return _method_idnum; }
281 void set_method_idnum(u2 idnum) { _method_idnum = idnum; }
282
283 private:
284 // Since the size of the compressed line number table is unknown, the
285 // offsets of the other variable sized sections are computed backwards
286 // from the end of the constMethodOop.
287
288 // First byte after constMethodOop
289 address constMethod_end() const
290 { return (address)((oop*)this + _constMethod_size); }
291
292 // Last short in constMethodOop
293 u2* last_u2_element() const
294 { return (u2*)constMethod_end() - 1; }
295 };