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annotate src/share/vm/oops/constMethodOop.hpp @ 4724:0841c0ec2ed6
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Reviewed-by: jcoomes
author | amurillo |
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date | Fri, 23 Dec 2011 15:29:34 -0800 |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2003, 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_CONSTMETHODOOP_HPP |
26 #define SHARE_VM_OOPS_CONSTMETHODOOP_HPP | |
27 | |
28 #include "oops/oop.hpp" | |
29 #include "oops/typeArrayOop.hpp" | |
30 | |
0 | 31 // An constMethodOop represents portions of a Java method which |
32 // do not vary. | |
33 // | |
34 // Memory layout (each line represents a word). Note that most | |
35 // applications load thousands of methods, so keeping the size of this | |
36 // structure small has a big impact on footprint. | |
37 // | |
38 // |------------------------------------------------------| | |
39 // | header | | |
40 // | klass | | |
41 // |------------------------------------------------------| | |
42 // | fingerprint 1 | | |
43 // | fingerprint 2 | | |
44 // | method (oop) | | |
45 // | stackmap_data (oop) | | |
46 // | exception_table (oop) | | |
47 // | constMethod_size | | |
48 // | interp_kind | flags | code_size | | |
49 // | name index | signature index | | |
50 // | method_idnum | generic_signature_index | | |
51 // |------------------------------------------------------| | |
52 // | | | |
53 // | byte codes | | |
54 // | | | |
55 // |------------------------------------------------------| | |
56 // | compressed linenumber table | | |
57 // | (see class CompressedLineNumberReadStream) | | |
58 // | (note that length is unknown until decompressed) | | |
59 // | (access flags bit tells whether table is present) | | |
60 // | (indexed from start of constMethodOop) | | |
61 // | (elements not necessarily sorted!) | | |
62 // |------------------------------------------------------| | |
63 // | localvariable table elements + length (length last) | | |
64 // | (length is u2, elements are 6-tuples of u2) | | |
65 // | (see class LocalVariableTableElement) | | |
66 // | (access flags bit tells whether table is present) | | |
67 // | (indexed from end of contMethodOop) | | |
68 // |------------------------------------------------------| | |
69 // | checked exceptions elements + length (length last) | | |
70 // | (length is u2, elements are u2) | | |
71 // | (see class CheckedExceptionElement) | | |
72 // | (access flags bit tells whether table is present) | | |
73 // | (indexed from end of constMethodOop) | | |
74 // |------------------------------------------------------| | |
75 | |
76 | |
77 // Utitily class decribing elements in checked exceptions table inlined in methodOop. | |
78 class CheckedExceptionElement VALUE_OBJ_CLASS_SPEC { | |
79 public: | |
80 u2 class_cp_index; | |
81 }; | |
82 | |
83 | |
84 // Utitily class decribing elements in local variable table inlined in methodOop. | |
85 class LocalVariableTableElement VALUE_OBJ_CLASS_SPEC { | |
86 public: | |
87 u2 start_bci; | |
88 u2 length; | |
89 u2 name_cp_index; | |
90 u2 descriptor_cp_index; | |
91 u2 signature_cp_index; | |
92 u2 slot; | |
93 }; | |
94 | |
95 | |
96 class constMethodOopDesc : public oopDesc { | |
97 friend class constMethodKlass; | |
98 friend class VMStructs; | |
99 private: | |
100 enum { | |
101 _has_linenumber_table = 1, | |
102 _has_checked_exceptions = 2, | |
103 _has_localvariable_table = 4 | |
104 }; | |
105 | |
106 // Bit vector of signature | |
107 // Callers interpret 0=not initialized yet and | |
108 // -1=too many args to fix, must parse the slow way. | |
109 // The real initial value is special to account for nonatomicity of 64 bit | |
110 // loads and stores. This value may updated and read without a lock by | |
111 // multiple threads, so is volatile. | |
112 volatile uint64_t _fingerprint; | |
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113 volatile bool _is_conc_safe; // if true, safe for concurrent GC processing |
0 | 114 |
115 public: | |
116 oop* oop_block_beg() const { return adr_method(); } | |
117 oop* oop_block_end() const { return adr_exception_table() + 1; } | |
118 | |
119 private: | |
120 // | |
121 // The oop block. See comment in klass.hpp before making changes. | |
122 // | |
123 | |
124 // Backpointer to non-const methodOop (needed for some JVMTI operations) | |
125 methodOop _method; | |
126 | |
127 // Raw stackmap data for the method | |
128 typeArrayOop _stackmap_data; | |
129 | |
130 // The exception handler table. 4-tuples of ints [start_pc, end_pc, | |
131 // handler_pc, catch_type index] For methods with no exceptions the | |
132 // table is pointing to Universe::the_empty_int_array | |
133 typeArrayOop _exception_table; | |
134 | |
135 // | |
136 // End of the oop block. | |
137 // | |
138 | |
139 int _constMethod_size; | |
140 jbyte _interpreter_kind; | |
141 jbyte _flags; | |
142 | |
143 // Size of Java bytecodes allocated immediately after methodOop. | |
144 u2 _code_size; | |
145 u2 _name_index; // Method name (index in constant pool) | |
146 u2 _signature_index; // Method signature (index in constant pool) | |
147 u2 _method_idnum; // unique identification number for the method within the class | |
148 // initially corresponds to the index into the methods array. | |
149 // but this may change with redefinition | |
150 u2 _generic_signature_index; // Generic signature (index in constant pool, 0 if absent) | |
151 | |
152 public: | |
153 // Inlined tables | |
154 void set_inlined_tables_length(int checked_exceptions_len, | |
155 int compressed_line_number_size, | |
156 int localvariable_table_len); | |
157 | |
158 bool has_linenumber_table() const | |
159 { return (_flags & _has_linenumber_table) != 0; } | |
160 | |
161 bool has_checked_exceptions() const | |
162 { return (_flags & _has_checked_exceptions) != 0; } | |
163 | |
164 bool has_localvariable_table() const | |
165 { return (_flags & _has_localvariable_table) != 0; } | |
166 | |
167 void set_interpreter_kind(int kind) { _interpreter_kind = kind; } | |
168 int interpreter_kind(void) const { return _interpreter_kind; } | |
169 | |
170 // backpointer to non-const methodOop | |
171 methodOop method() const { return _method; } | |
172 void set_method(methodOop m) { oop_store_without_check((oop*)&_method, (oop) m); } | |
173 | |
174 | |
175 // stackmap table data | |
176 typeArrayOop stackmap_data() const { return _stackmap_data; } | |
177 void set_stackmap_data(typeArrayOop sd) { | |
178 oop_store_without_check((oop*)&_stackmap_data, (oop)sd); | |
179 } | |
180 bool has_stackmap_table() const { return _stackmap_data != NULL; } | |
181 | |
182 // exception handler table | |
183 typeArrayOop exception_table() const { return _exception_table; } | |
184 void set_exception_table(typeArrayOop e) { oop_store_without_check((oop*) &_exception_table, (oop) e); } | |
185 bool has_exception_handler() const { return exception_table() != NULL && exception_table()->length() > 0; } | |
186 | |
187 void init_fingerprint() { | |
188 const uint64_t initval = CONST64(0x8000000000000000); | |
189 _fingerprint = initval; | |
190 } | |
191 | |
192 uint64_t fingerprint() const { | |
193 // Since reads aren't atomic for 64 bits, if any of the high or low order | |
194 // word is the initial value, return 0. See init_fingerprint for initval. | |
195 uint high_fp = (uint)(_fingerprint >> 32); | |
196 if ((int) _fingerprint == 0 || high_fp == 0x80000000) { | |
197 return 0L; | |
198 } else { | |
199 return _fingerprint; | |
200 } | |
201 } | |
202 | |
203 uint64_t set_fingerprint(uint64_t new_fingerprint) { | |
204 #ifdef ASSERT | |
205 // Assert only valid if complete/valid 64 bit _fingerprint value is read. | |
206 uint64_t oldfp = fingerprint(); | |
207 #endif // ASSERT | |
208 _fingerprint = new_fingerprint; | |
209 assert(oldfp == 0L || new_fingerprint == oldfp, | |
210 "fingerprint cannot change"); | |
211 assert(((new_fingerprint >> 32) != 0x80000000) && (int)new_fingerprint !=0, | |
212 "fingerprint should call init to set initial value"); | |
213 return new_fingerprint; | |
214 } | |
215 | |
216 // name | |
217 int name_index() const { return _name_index; } | |
218 void set_name_index(int index) { _name_index = index; } | |
219 | |
220 // signature | |
221 int signature_index() const { return _signature_index; } | |
222 void set_signature_index(int index) { _signature_index = index; } | |
223 | |
224 // generics support | |
225 int generic_signature_index() const { return _generic_signature_index; } | |
226 void set_generic_signature_index(int index) { _generic_signature_index = index; } | |
227 | |
228 // Sizing | |
229 static int header_size() { | |
230 return sizeof(constMethodOopDesc)/HeapWordSize; | |
231 } | |
232 | |
233 // Object size needed | |
234 static int object_size(int code_size, int compressed_line_number_size, | |
235 int local_variable_table_length, | |
236 int checked_exceptions_length); | |
237 | |
238 int object_size() const { return _constMethod_size; } | |
239 void set_constMethod_size(int size) { _constMethod_size = size; } | |
240 // Is object parsable by gc | |
241 bool object_is_parsable() { return object_size() > 0; } | |
242 | |
243 // code size | |
244 int code_size() const { return _code_size; } | |
245 void set_code_size(int size) { | |
246 assert(max_method_code_size < (1 << 16), | |
247 "u2 is too small to hold method code size in general"); | |
248 assert(0 <= size && size <= max_method_code_size, "invalid code size"); | |
249 _code_size = size; | |
250 } | |
251 | |
252 // linenumber table - note that length is unknown until decompression, | |
253 // see class CompressedLineNumberReadStream. | |
254 u_char* compressed_linenumber_table() const; // not preserved by gc | |
255 u2* checked_exceptions_length_addr() const; | |
256 u2* localvariable_table_length_addr() const; | |
257 | |
258 // checked exceptions | |
259 int checked_exceptions_length() const; | |
260 CheckedExceptionElement* checked_exceptions_start() const; | |
261 | |
262 // localvariable table | |
263 int localvariable_table_length() const; | |
264 LocalVariableTableElement* localvariable_table_start() const; | |
265 | |
266 // byte codes | |
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267 void set_code(address code) { |
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268 if (code_size() > 0) { |
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269 memcpy(code_base(), code, code_size()); |
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270 } |
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271 } |
0 | 272 address code_base() const { return (address) (this+1); } |
273 address code_end() const { return code_base() + code_size(); } | |
274 bool contains(address bcp) const { return code_base() <= bcp | |
275 && bcp < code_end(); } | |
276 // Offset to bytecodes | |
277 static ByteSize codes_offset() | |
278 { return in_ByteSize(sizeof(constMethodOopDesc)); } | |
279 | |
280 // interpreter support | |
281 static ByteSize exception_table_offset() | |
282 { return byte_offset_of(constMethodOopDesc, _exception_table); } | |
283 | |
284 // Garbage collection support | |
285 oop* adr_method() const { return (oop*)&_method; } | |
286 oop* adr_stackmap_data() const { return (oop*)&_stackmap_data; } | |
287 oop* adr_exception_table() const { return (oop*)&_exception_table; } | |
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288 bool is_conc_safe() { return _is_conc_safe; } |
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289 void set_is_conc_safe(bool v) { _is_conc_safe = v; } |
0 | 290 |
291 // Unique id for the method | |
292 static const u2 MAX_IDNUM; | |
293 static const u2 UNSET_IDNUM; | |
294 u2 method_idnum() const { return _method_idnum; } | |
295 void set_method_idnum(u2 idnum) { _method_idnum = idnum; } | |
296 | |
297 private: | |
298 // Since the size of the compressed line number table is unknown, the | |
299 // offsets of the other variable sized sections are computed backwards | |
300 // from the end of the constMethodOop. | |
301 | |
302 // First byte after constMethodOop | |
303 address constMethod_end() const | |
304 { return (address)((oop*)this + _constMethod_size); } | |
305 | |
306 // Last short in constMethodOop | |
307 u2* last_u2_element() const | |
308 { return (u2*)constMethod_end() - 1; } | |
309 }; | |
1972 | 310 |
311 #endif // SHARE_VM_OOPS_CONSTMETHODOOP_HPP |