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annotate src/share/vm/oops/constMethodOop.hpp @ 6255:113f4c73df61
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0 | 1 /* |
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2 * Copyright (c) 2003, 2012, 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 | | |
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44 // | constants (oop) | |
0 | 45 // | stackmap_data (oop) | |
46 // | constMethod_size | | |
47 // | interp_kind | flags | code_size | | |
48 // | name index | signature index | | |
49 // | method_idnum | generic_signature_index | | |
50 // |------------------------------------------------------| | |
51 // | | | |
52 // | byte codes | | |
53 // | | | |
54 // |------------------------------------------------------| | |
55 // | compressed linenumber table | | |
56 // | (see class CompressedLineNumberReadStream) | | |
57 // | (note that length is unknown until decompressed) | | |
58 // | (access flags bit tells whether table is present) | | |
59 // | (indexed from start of constMethodOop) | | |
60 // | (elements not necessarily sorted!) | | |
61 // |------------------------------------------------------| | |
62 // | localvariable table elements + length (length last) | | |
63 // | (length is u2, elements are 6-tuples of u2) | | |
64 // | (see class LocalVariableTableElement) | | |
65 // | (access flags bit tells whether table is present) | | |
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66 // | (indexed from end of constMethodOop) | |
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67 // |------------------------------------------------------| |
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68 // | exception table + length (length last) | |
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69 // | (length is u2, elements are 4-tuples of u2) | |
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70 // | (see class ExceptionTableElement) | |
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71 // | (access flags bit tells whether table is present) | |
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72 // | (indexed from end of constMethodOop) | |
0 | 73 // |------------------------------------------------------| |
74 // | checked exceptions elements + length (length last) | | |
75 // | (length is u2, elements are u2) | | |
76 // | (see class CheckedExceptionElement) | | |
77 // | (access flags bit tells whether table is present) | | |
78 // | (indexed from end of constMethodOop) | | |
79 // |------------------------------------------------------| | |
80 | |
81 | |
82 // Utitily class decribing elements in checked exceptions table inlined in methodOop. | |
83 class CheckedExceptionElement VALUE_OBJ_CLASS_SPEC { | |
84 public: | |
85 u2 class_cp_index; | |
86 }; | |
87 | |
88 | |
89 // Utitily class decribing elements in local variable table inlined in methodOop. | |
90 class LocalVariableTableElement VALUE_OBJ_CLASS_SPEC { | |
91 public: | |
92 u2 start_bci; | |
93 u2 length; | |
94 u2 name_cp_index; | |
95 u2 descriptor_cp_index; | |
96 u2 signature_cp_index; | |
97 u2 slot; | |
98 }; | |
99 | |
100 | |
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101 // Utitily class describing elements in exception table |
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102 class ExceptionTableElement VALUE_OBJ_CLASS_SPEC { |
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103 public: |
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104 u2 start_pc; |
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105 u2 end_pc; |
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106 u2 handler_pc; |
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107 u2 catch_type_index; |
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108 }; |
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109 |
0 | 110 class constMethodOopDesc : public oopDesc { |
111 friend class constMethodKlass; | |
112 friend class VMStructs; | |
113 private: | |
114 enum { | |
115 _has_linenumber_table = 1, | |
116 _has_checked_exceptions = 2, | |
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117 _has_localvariable_table = 4, |
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118 _has_exception_table = 8 |
0 | 119 }; |
120 | |
121 // Bit vector of signature | |
122 // Callers interpret 0=not initialized yet and | |
123 // -1=too many args to fix, must parse the slow way. | |
124 // The real initial value is special to account for nonatomicity of 64 bit | |
125 // loads and stores. This value may updated and read without a lock by | |
126 // multiple threads, so is volatile. | |
127 volatile uint64_t _fingerprint; | |
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128 volatile bool _is_conc_safe; // if true, safe for concurrent GC processing |
0 | 129 |
130 public: | |
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131 oop* oop_block_beg() const { return adr_constants(); } |
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132 oop* oop_block_end() const { return adr_stackmap_data() + 1; } |
0 | 133 |
134 private: | |
135 // | |
136 // The oop block. See comment in klass.hpp before making changes. | |
137 // | |
138 | |
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139 constantPoolOop _constants; // Constant pool |
0 | 140 |
141 // Raw stackmap data for the method | |
142 typeArrayOop _stackmap_data; | |
143 | |
144 // | |
145 // End of the oop block. | |
146 // | |
147 | |
148 int _constMethod_size; | |
149 jbyte _interpreter_kind; | |
150 jbyte _flags; | |
151 | |
152 // Size of Java bytecodes allocated immediately after methodOop. | |
153 u2 _code_size; | |
154 u2 _name_index; // Method name (index in constant pool) | |
155 u2 _signature_index; // Method signature (index in constant pool) | |
156 u2 _method_idnum; // unique identification number for the method within the class | |
157 // initially corresponds to the index into the methods array. | |
158 // but this may change with redefinition | |
159 u2 _generic_signature_index; // Generic signature (index in constant pool, 0 if absent) | |
160 | |
161 public: | |
162 // Inlined tables | |
163 void set_inlined_tables_length(int checked_exceptions_len, | |
164 int compressed_line_number_size, | |
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165 int localvariable_table_len, |
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166 int exception_table_len); |
0 | 167 |
168 bool has_linenumber_table() const | |
169 { return (_flags & _has_linenumber_table) != 0; } | |
170 | |
171 bool has_checked_exceptions() const | |
172 { return (_flags & _has_checked_exceptions) != 0; } | |
173 | |
174 bool has_localvariable_table() const | |
175 { return (_flags & _has_localvariable_table) != 0; } | |
176 | |
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177 bool has_exception_handler() const |
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178 { return (_flags & _has_exception_table) != 0; } |
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179 |
0 | 180 void set_interpreter_kind(int kind) { _interpreter_kind = kind; } |
181 int interpreter_kind(void) const { return _interpreter_kind; } | |
182 | |
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183 // constant pool |
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184 constantPoolOop constants() const { return _constants; } |
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185 void set_constants(constantPoolOop c) { |
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186 oop_store_without_check((oop*)&_constants, (oop)c); |
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187 } |
0 | 188 |
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189 methodOop method() const; |
0 | 190 |
191 // stackmap table data | |
192 typeArrayOop stackmap_data() const { return _stackmap_data; } | |
193 void set_stackmap_data(typeArrayOop sd) { | |
194 oop_store_without_check((oop*)&_stackmap_data, (oop)sd); | |
195 } | |
196 bool has_stackmap_table() const { return _stackmap_data != NULL; } | |
197 | |
198 void init_fingerprint() { | |
199 const uint64_t initval = CONST64(0x8000000000000000); | |
200 _fingerprint = initval; | |
201 } | |
202 | |
203 uint64_t fingerprint() const { | |
204 // Since reads aren't atomic for 64 bits, if any of the high or low order | |
205 // word is the initial value, return 0. See init_fingerprint for initval. | |
206 uint high_fp = (uint)(_fingerprint >> 32); | |
207 if ((int) _fingerprint == 0 || high_fp == 0x80000000) { | |
208 return 0L; | |
209 } else { | |
210 return _fingerprint; | |
211 } | |
212 } | |
213 | |
214 uint64_t set_fingerprint(uint64_t new_fingerprint) { | |
215 #ifdef ASSERT | |
216 // Assert only valid if complete/valid 64 bit _fingerprint value is read. | |
217 uint64_t oldfp = fingerprint(); | |
218 #endif // ASSERT | |
219 _fingerprint = new_fingerprint; | |
220 assert(oldfp == 0L || new_fingerprint == oldfp, | |
221 "fingerprint cannot change"); | |
222 assert(((new_fingerprint >> 32) != 0x80000000) && (int)new_fingerprint !=0, | |
223 "fingerprint should call init to set initial value"); | |
224 return new_fingerprint; | |
225 } | |
226 | |
227 // name | |
228 int name_index() const { return _name_index; } | |
229 void set_name_index(int index) { _name_index = index; } | |
230 | |
231 // signature | |
232 int signature_index() const { return _signature_index; } | |
233 void set_signature_index(int index) { _signature_index = index; } | |
234 | |
235 // generics support | |
236 int generic_signature_index() const { return _generic_signature_index; } | |
237 void set_generic_signature_index(int index) { _generic_signature_index = index; } | |
238 | |
239 // Sizing | |
240 static int header_size() { | |
241 return sizeof(constMethodOopDesc)/HeapWordSize; | |
242 } | |
243 | |
244 // Object size needed | |
245 static int object_size(int code_size, int compressed_line_number_size, | |
246 int local_variable_table_length, | |
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247 int exception_table_length, |
0 | 248 int checked_exceptions_length); |
249 | |
250 int object_size() const { return _constMethod_size; } | |
251 void set_constMethod_size(int size) { _constMethod_size = size; } | |
252 // Is object parsable by gc | |
253 bool object_is_parsable() { return object_size() > 0; } | |
254 | |
255 // code size | |
256 int code_size() const { return _code_size; } | |
257 void set_code_size(int size) { | |
258 assert(max_method_code_size < (1 << 16), | |
259 "u2 is too small to hold method code size in general"); | |
260 assert(0 <= size && size <= max_method_code_size, "invalid code size"); | |
261 _code_size = size; | |
262 } | |
263 | |
264 // linenumber table - note that length is unknown until decompression, | |
265 // see class CompressedLineNumberReadStream. | |
266 u_char* compressed_linenumber_table() const; // not preserved by gc | |
267 u2* checked_exceptions_length_addr() const; | |
268 u2* localvariable_table_length_addr() const; | |
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269 u2* exception_table_length_addr() const; |
0 | 270 |
271 // checked exceptions | |
272 int checked_exceptions_length() const; | |
273 CheckedExceptionElement* checked_exceptions_start() const; | |
274 | |
275 // localvariable table | |
276 int localvariable_table_length() const; | |
277 LocalVariableTableElement* localvariable_table_start() const; | |
278 | |
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279 // exception table |
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280 int exception_table_length() const; |
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281 ExceptionTableElement* exception_table_start() const; |
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282 |
0 | 283 // byte codes |
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284 void set_code(address code) { |
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285 if (code_size() > 0) { |
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286 memcpy(code_base(), code, code_size()); |
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287 } |
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288 } |
0 | 289 address code_base() const { return (address) (this+1); } |
290 address code_end() const { return code_base() + code_size(); } | |
291 bool contains(address bcp) const { return code_base() <= bcp | |
292 && bcp < code_end(); } | |
293 // Offset to bytecodes | |
294 static ByteSize codes_offset() | |
295 { return in_ByteSize(sizeof(constMethodOopDesc)); } | |
296 | |
297 // interpreter support | |
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298 static ByteSize constants_offset() |
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299 { return byte_offset_of(constMethodOopDesc, _constants); } |
0 | 300 |
301 // Garbage collection support | |
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302 oop* adr_constants() const { return (oop*)&_constants; } |
0 | 303 oop* adr_stackmap_data() const { return (oop*)&_stackmap_data; } |
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304 bool is_conc_safe() { return _is_conc_safe; } |
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305 void set_is_conc_safe(bool v) { _is_conc_safe = v; } |
0 | 306 |
307 // Unique id for the method | |
308 static const u2 MAX_IDNUM; | |
309 static const u2 UNSET_IDNUM; | |
310 u2 method_idnum() const { return _method_idnum; } | |
311 void set_method_idnum(u2 idnum) { _method_idnum = idnum; } | |
312 | |
313 private: | |
314 // Since the size of the compressed line number table is unknown, the | |
315 // offsets of the other variable sized sections are computed backwards | |
316 // from the end of the constMethodOop. | |
317 | |
318 // First byte after constMethodOop | |
319 address constMethod_end() const | |
320 { return (address)((oop*)this + _constMethod_size); } | |
321 | |
322 // Last short in constMethodOop | |
323 u2* last_u2_element() const | |
324 { return (u2*)constMethod_end() - 1; } | |
325 }; | |
1972 | 326 |
327 #endif // SHARE_VM_OOPS_CONSTMETHODOOP_HPP |