Mercurial > hg > truffle
annotate src/share/vm/oops/constMethod.hpp @ 7350:ae5b1dbd9b8a
Disable inc/dec again.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 12 Jan 2013 23:13:45 +0100 |
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children | fd74228fd5ca |
rev | line source |
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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 | |
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30 // An ConstMethod* represents portions of a Java method which |
0 | 31 // do not vary. |
32 // | |
33 // Memory layout (each line represents a word). Note that most | |
34 // applications load thousands of methods, so keeping the size of this | |
35 // structure small has a big impact on footprint. | |
36 // | |
37 // |------------------------------------------------------| | |
38 // | header | | |
39 // | klass | | |
40 // |------------------------------------------------------| | |
41 // | fingerprint 1 | | |
42 // | fingerprint 2 | | |
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43 // | constants (oop) | |
0 | 44 // | stackmap_data (oop) | |
45 // | constMethod_size | | |
46 // | interp_kind | flags | code_size | | |
47 // | name index | signature index | | |
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48 // | method_idnum | max_stack | |
0 | 49 // |------------------------------------------------------| |
50 // | | | |
51 // | byte codes | | |
52 // | | | |
53 // |------------------------------------------------------| | |
54 // | compressed linenumber table | | |
55 // | (see class CompressedLineNumberReadStream) | | |
56 // | (note that length is unknown until decompressed) | | |
57 // | (access flags bit tells whether table is present) | | |
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58 // | (indexed from start of ConstMethod*) | |
0 | 59 // | (elements not necessarily sorted!) | |
60 // |------------------------------------------------------| | |
61 // | localvariable table elements + length (length last) | | |
62 // | (length is u2, elements are 6-tuples of u2) | | |
63 // | (see class LocalVariableTableElement) | | |
64 // | (access flags bit tells whether table is present) | | |
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65 // | (indexed from end of ConstMethod*) | |
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66 // |------------------------------------------------------| |
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67 // | exception table + length (length last) | |
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68 // | (length is u2, elements are 4-tuples of u2) | |
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69 // | (see class ExceptionTableElement) | |
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70 // | (access flags bit tells whether table is present) | |
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71 // | (indexed from end of ConstMethod*) | |
0 | 72 // |------------------------------------------------------| |
73 // | checked exceptions elements + length (length last) | | |
74 // | (length is u2, elements are u2) | | |
75 // | (see class CheckedExceptionElement) | | |
76 // | (access flags bit tells whether table is present) | | |
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77 // | (indexed from end of ConstMethod*) | |
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78 // |------------------------------------------------------| |
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79 // | generic signature index (u2) | |
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80 // | (indexed from start of constMethodOop) | |
0 | 81 // |------------------------------------------------------| |
82 | |
83 | |
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84 // Utitily class decribing elements in checked exceptions table inlined in Method*. |
0 | 85 class CheckedExceptionElement VALUE_OBJ_CLASS_SPEC { |
86 public: | |
87 u2 class_cp_index; | |
88 }; | |
89 | |
90 | |
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91 // Utitily class decribing elements in local variable table inlined in Method*. |
0 | 92 class LocalVariableTableElement VALUE_OBJ_CLASS_SPEC { |
93 public: | |
94 u2 start_bci; | |
95 u2 length; | |
96 u2 name_cp_index; | |
97 u2 descriptor_cp_index; | |
98 u2 signature_cp_index; | |
99 u2 slot; | |
100 }; | |
101 | |
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102 // Utitily class describing elements in exception table |
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103 class ExceptionTableElement VALUE_OBJ_CLASS_SPEC { |
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104 public: |
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105 u2 start_pc; |
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106 u2 end_pc; |
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107 u2 handler_pc; |
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108 u2 catch_type_index; |
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109 }; |
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110 |
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111 |
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112 class ConstMethod : public MetaspaceObj { |
0 | 113 friend class VMStructs; |
6934 | 114 |
115 public: | |
116 typedef enum { NORMAL, OVERPASS } MethodType; | |
117 | |
0 | 118 private: |
119 enum { | |
120 _has_linenumber_table = 1, | |
121 _has_checked_exceptions = 2, | |
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122 _has_localvariable_table = 4, |
6934 | 123 _has_exception_table = 8, |
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124 _has_generic_signature = 16, |
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125 _is_overpass = 32 |
0 | 126 }; |
127 | |
128 // Bit vector of signature | |
129 // Callers interpret 0=not initialized yet and | |
130 // -1=too many args to fix, must parse the slow way. | |
131 // The real initial value is special to account for nonatomicity of 64 bit | |
132 // loads and stores. This value may updated and read without a lock by | |
133 // multiple threads, so is volatile. | |
134 volatile uint64_t _fingerprint; | |
135 | |
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136 ConstantPool* _constants; // Constant pool |
0 | 137 |
138 // Raw stackmap data for the method | |
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139 Array<u1>* _stackmap_data; |
0 | 140 |
141 int _constMethod_size; | |
142 jbyte _interpreter_kind; | |
143 jbyte _flags; | |
144 | |
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145 // Size of Java bytecodes allocated immediately after Method*. |
0 | 146 u2 _code_size; |
147 u2 _name_index; // Method name (index in constant pool) | |
148 u2 _signature_index; // Method signature (index in constant pool) | |
149 u2 _method_idnum; // unique identification number for the method within the class | |
150 // initially corresponds to the index into the methods array. | |
151 // but this may change with redefinition | |
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152 u2 _max_stack; // Maximum number of entries on the expression stack |
0 | 153 |
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154 |
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155 // Constructor |
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156 ConstMethod(int byte_code_size, |
6934 | 157 int compressed_line_number_size, |
158 int localvariable_table_length, | |
159 int exception_table_length, | |
160 int checked_exceptions_length, | |
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161 u2 generic_signature_index, |
6934 | 162 MethodType is_overpass, |
163 int size); | |
0 | 164 public: |
6934 | 165 |
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166 static ConstMethod* allocate(ClassLoaderData* loader_data, |
6934 | 167 int byte_code_size, |
168 int compressed_line_number_size, | |
169 int localvariable_table_length, | |
170 int exception_table_length, | |
171 int checked_exceptions_length, | |
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172 u2 generic_signature_index, |
6934 | 173 MethodType mt, |
174 TRAPS); | |
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175 |
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176 bool is_constMethod() const { return true; } |
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177 |
0 | 178 // Inlined tables |
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179 void set_inlined_tables_length(u2 generic_signature_index, |
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180 int checked_exceptions_len, |
0 | 181 int compressed_line_number_size, |
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182 int localvariable_table_len, |
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183 int exception_table_len); |
0 | 184 |
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185 bool has_generic_signature() const |
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186 { return (_flags & _has_generic_signature) != 0; } |
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187 |
0 | 188 bool has_linenumber_table() const |
189 { return (_flags & _has_linenumber_table) != 0; } | |
190 | |
191 bool has_checked_exceptions() const | |
192 { return (_flags & _has_checked_exceptions) != 0; } | |
193 | |
194 bool has_localvariable_table() const | |
195 { return (_flags & _has_localvariable_table) != 0; } | |
196 | |
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197 bool has_exception_handler() const |
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198 { return (_flags & _has_exception_table) != 0; } |
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199 |
6934 | 200 MethodType method_type() const { |
201 return ((_flags & _is_overpass) == 0) ? NORMAL : OVERPASS; | |
202 } | |
203 | |
204 void set_method_type(MethodType mt) { | |
205 if (mt == NORMAL) { | |
206 _flags &= ~(_is_overpass); | |
207 } else { | |
208 _flags |= _is_overpass; | |
209 } | |
210 } | |
211 | |
212 | |
0 | 213 void set_interpreter_kind(int kind) { _interpreter_kind = kind; } |
214 int interpreter_kind(void) const { return _interpreter_kind; } | |
215 | |
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216 // constant pool |
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217 ConstantPool* constants() const { return _constants; } |
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218 void set_constants(ConstantPool* c) { _constants = c; } |
0 | 219 |
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220 Method* method() const; |
0 | 221 |
222 // stackmap table data | |
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223 Array<u1>* stackmap_data() const { return _stackmap_data; } |
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224 void set_stackmap_data(Array<u1>* sd) { _stackmap_data = sd; } |
0 | 225 bool has_stackmap_table() const { return _stackmap_data != NULL; } |
226 | |
227 void init_fingerprint() { | |
228 const uint64_t initval = CONST64(0x8000000000000000); | |
229 _fingerprint = initval; | |
230 } | |
231 | |
232 uint64_t fingerprint() const { | |
233 // Since reads aren't atomic for 64 bits, if any of the high or low order | |
234 // word is the initial value, return 0. See init_fingerprint for initval. | |
235 uint high_fp = (uint)(_fingerprint >> 32); | |
236 if ((int) _fingerprint == 0 || high_fp == 0x80000000) { | |
237 return 0L; | |
238 } else { | |
239 return _fingerprint; | |
240 } | |
241 } | |
242 | |
243 uint64_t set_fingerprint(uint64_t new_fingerprint) { | |
244 #ifdef ASSERT | |
245 // Assert only valid if complete/valid 64 bit _fingerprint value is read. | |
246 uint64_t oldfp = fingerprint(); | |
247 #endif // ASSERT | |
248 _fingerprint = new_fingerprint; | |
249 assert(oldfp == 0L || new_fingerprint == oldfp, | |
250 "fingerprint cannot change"); | |
251 assert(((new_fingerprint >> 32) != 0x80000000) && (int)new_fingerprint !=0, | |
252 "fingerprint should call init to set initial value"); | |
253 return new_fingerprint; | |
254 } | |
255 | |
256 // name | |
257 int name_index() const { return _name_index; } | |
258 void set_name_index(int index) { _name_index = index; } | |
259 | |
260 // signature | |
261 int signature_index() const { return _signature_index; } | |
262 void set_signature_index(int index) { _signature_index = index; } | |
263 | |
264 // generics support | |
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265 int generic_signature_index() const { |
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266 if (has_generic_signature()) { |
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267 return *generic_signature_index_addr(); |
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268 } else { |
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269 return 0; |
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270 } |
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271 } |
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272 void set_generic_signature_index(u2 index) { |
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273 assert(has_generic_signature(), ""); |
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274 u2* addr = generic_signature_index_addr(); |
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275 *addr = index; |
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276 } |
0 | 277 |
278 // Sizing | |
279 static int header_size() { | |
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280 return sizeof(ConstMethod)/HeapWordSize; |
0 | 281 } |
282 | |
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283 // Size needed |
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284 static int size(int code_size, int compressed_line_number_size, |
0 | 285 int local_variable_table_length, |
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286 int exception_table_length, |
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287 int checked_exceptions_length, |
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288 u2 generic_signature_index); |
0 | 289 |
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290 int size() const { return _constMethod_size;} |
0 | 291 void set_constMethod_size(int size) { _constMethod_size = size; } |
292 | |
293 // code size | |
294 int code_size() const { return _code_size; } | |
295 void set_code_size(int size) { | |
296 assert(max_method_code_size < (1 << 16), | |
297 "u2 is too small to hold method code size in general"); | |
298 assert(0 <= size && size <= max_method_code_size, "invalid code size"); | |
299 _code_size = size; | |
300 } | |
301 | |
302 // linenumber table - note that length is unknown until decompression, | |
303 // see class CompressedLineNumberReadStream. | |
304 u_char* compressed_linenumber_table() const; // not preserved by gc | |
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305 u2* generic_signature_index_addr() const; |
0 | 306 u2* checked_exceptions_length_addr() const; |
307 u2* localvariable_table_length_addr() const; | |
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308 u2* exception_table_length_addr() const; |
0 | 309 |
310 // checked exceptions | |
311 int checked_exceptions_length() const; | |
312 CheckedExceptionElement* checked_exceptions_start() const; | |
313 | |
314 // localvariable table | |
315 int localvariable_table_length() const; | |
316 LocalVariableTableElement* localvariable_table_start() const; | |
317 | |
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318 // exception table |
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319 int exception_table_length() const; |
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320 ExceptionTableElement* exception_table_start() const; |
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321 |
0 | 322 // byte codes |
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323 void set_code(address code) { |
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324 if (code_size() > 0) { |
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325 memcpy(code_base(), code, code_size()); |
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326 } |
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327 } |
0 | 328 address code_base() const { return (address) (this+1); } |
329 address code_end() const { return code_base() + code_size(); } | |
330 bool contains(address bcp) const { return code_base() <= bcp | |
331 && bcp < code_end(); } | |
332 // Offset to bytecodes | |
333 static ByteSize codes_offset() | |
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334 { return in_ByteSize(sizeof(ConstMethod)); } |
0 | 335 |
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336 static ByteSize constants_offset() |
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337 { return byte_offset_of(ConstMethod, _constants); } |
0 | 338 |
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339 static ByteSize max_stack_offset() |
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340 { return byte_offset_of(ConstMethod, _max_stack); } |
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341 |
0 | 342 // Unique id for the method |
343 static const u2 MAX_IDNUM; | |
344 static const u2 UNSET_IDNUM; | |
345 u2 method_idnum() const { return _method_idnum; } | |
346 void set_method_idnum(u2 idnum) { _method_idnum = idnum; } | |
347 | |
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348 // max stack |
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349 int max_stack() const { return _max_stack; } |
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350 void set_max_stack(int size) { _max_stack = size; } |
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351 |
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352 // Deallocation for RedefineClasses |
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353 void deallocate_contents(ClassLoaderData* loader_data); |
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354 bool is_klass() const { return false; } |
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355 DEBUG_ONLY(bool on_stack() { return false; }) |
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356 |
0 | 357 private: |
358 // Since the size of the compressed line number table is unknown, the | |
359 // offsets of the other variable sized sections are computed backwards | |
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360 // from the end of the ConstMethod*. |
0 | 361 |
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362 // First byte after ConstMethod* |
0 | 363 address constMethod_end() const |
364 { return (address)((oop*)this + _constMethod_size); } | |
365 | |
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366 // Last short in ConstMethod* |
0 | 367 u2* last_u2_element() const |
368 { return (u2*)constMethod_end() - 1; } | |
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369 |
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370 public: |
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371 // Printing |
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372 void print_on (outputStream* st) const; |
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373 void print_value_on(outputStream* st) const; |
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374 |
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375 const char* internal_name() const { return "{constMethod}"; } |
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376 |
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377 // Verify |
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378 void verify_on(outputStream* st); |
0 | 379 }; |
1972 | 380 |
381 #endif // SHARE_VM_OOPS_CONSTMETHODOOP_HPP |