Mercurial > hg > graal-compiler
comparison src/share/vm/oops/constMethodOop.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | 0af8b0718fc9 |
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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 }; |