Mercurial > hg > graal-compiler
annotate src/share/vm/oops/constMethod.hpp @ 7106:4983da9d3fc7
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author | Christian Wimmer <christian.wimmer@oracle.com> |
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date | Thu, 29 Nov 2012 17:43:48 -0800 |
parents | 4735d2c84362 |
children | b2dbd323c668 |
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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 | | |
48 // | method_idnum | generic_signature_index | | |
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*) | |
0 | 78 // |------------------------------------------------------| |
79 | |
80 | |
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81 // Utitily class decribing elements in checked exceptions table inlined in Method*. |
0 | 82 class CheckedExceptionElement VALUE_OBJ_CLASS_SPEC { |
83 public: | |
84 u2 class_cp_index; | |
85 }; | |
86 | |
87 | |
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88 // Utitily class decribing elements in local variable table inlined in Method*. |
0 | 89 class LocalVariableTableElement VALUE_OBJ_CLASS_SPEC { |
90 public: | |
91 u2 start_bci; | |
92 u2 length; | |
93 u2 name_cp_index; | |
94 u2 descriptor_cp_index; | |
95 u2 signature_cp_index; | |
96 u2 slot; | |
97 }; | |
98 | |
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99 // Utitily class describing elements in exception table |
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100 class ExceptionTableElement VALUE_OBJ_CLASS_SPEC { |
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101 public: |
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102 u2 start_pc; |
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103 u2 end_pc; |
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104 u2 handler_pc; |
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105 u2 catch_type_index; |
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106 }; |
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107 |
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108 |
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109 class ConstMethod : public MetaspaceObj { |
0 | 110 friend class VMStructs; |
6934 | 111 |
112 public: | |
113 typedef enum { NORMAL, OVERPASS } MethodType; | |
114 | |
0 | 115 private: |
116 enum { | |
117 _has_linenumber_table = 1, | |
118 _has_checked_exceptions = 2, | |
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119 _has_localvariable_table = 4, |
6934 | 120 _has_exception_table = 8, |
121 _is_overpass = 16 | |
0 | 122 }; |
123 | |
124 // Bit vector of signature | |
125 // Callers interpret 0=not initialized yet and | |
126 // -1=too many args to fix, must parse the slow way. | |
127 // The real initial value is special to account for nonatomicity of 64 bit | |
128 // loads and stores. This value may updated and read without a lock by | |
129 // multiple threads, so is volatile. | |
130 volatile uint64_t _fingerprint; | |
131 | |
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132 ConstantPool* _constants; // Constant pool |
0 | 133 |
134 // Raw stackmap data for the method | |
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135 Array<u1>* _stackmap_data; |
0 | 136 |
137 int _constMethod_size; | |
138 jbyte _interpreter_kind; | |
139 jbyte _flags; | |
140 | |
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141 // Size of Java bytecodes allocated immediately after Method*. |
0 | 142 u2 _code_size; |
143 u2 _name_index; // Method name (index in constant pool) | |
144 u2 _signature_index; // Method signature (index in constant pool) | |
145 u2 _method_idnum; // unique identification number for the method within the class | |
146 // initially corresponds to the index into the methods array. | |
147 // but this may change with redefinition | |
148 u2 _generic_signature_index; // Generic signature (index in constant pool, 0 if absent) | |
149 | |
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150 |
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151 // Constructor |
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152 ConstMethod(int byte_code_size, |
6934 | 153 int compressed_line_number_size, |
154 int localvariable_table_length, | |
155 int exception_table_length, | |
156 int checked_exceptions_length, | |
157 MethodType is_overpass, | |
158 int size); | |
0 | 159 public: |
6934 | 160 |
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161 static ConstMethod* allocate(ClassLoaderData* loader_data, |
6934 | 162 int byte_code_size, |
163 int compressed_line_number_size, | |
164 int localvariable_table_length, | |
165 int exception_table_length, | |
166 int checked_exceptions_length, | |
167 MethodType mt, | |
168 TRAPS); | |
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169 |
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170 bool is_constMethod() const { return true; } |
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171 |
0 | 172 // Inlined tables |
173 void set_inlined_tables_length(int checked_exceptions_len, | |
174 int compressed_line_number_size, | |
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175 int localvariable_table_len, |
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176 int exception_table_len); |
0 | 177 |
178 bool has_linenumber_table() const | |
179 { return (_flags & _has_linenumber_table) != 0; } | |
180 | |
181 bool has_checked_exceptions() const | |
182 { return (_flags & _has_checked_exceptions) != 0; } | |
183 | |
184 bool has_localvariable_table() const | |
185 { return (_flags & _has_localvariable_table) != 0; } | |
186 | |
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187 bool has_exception_handler() const |
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188 { return (_flags & _has_exception_table) != 0; } |
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189 |
6934 | 190 MethodType method_type() const { |
191 return ((_flags & _is_overpass) == 0) ? NORMAL : OVERPASS; | |
192 } | |
193 | |
194 void set_method_type(MethodType mt) { | |
195 if (mt == NORMAL) { | |
196 _flags &= ~(_is_overpass); | |
197 } else { | |
198 _flags |= _is_overpass; | |
199 } | |
200 } | |
201 | |
202 | |
0 | 203 void set_interpreter_kind(int kind) { _interpreter_kind = kind; } |
204 int interpreter_kind(void) const { return _interpreter_kind; } | |
205 | |
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206 // constant pool |
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207 ConstantPool* constants() const { return _constants; } |
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208 void set_constants(ConstantPool* c) { _constants = c; } |
0 | 209 |
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210 Method* method() const; |
0 | 211 |
212 // stackmap table data | |
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213 Array<u1>* stackmap_data() const { return _stackmap_data; } |
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214 void set_stackmap_data(Array<u1>* sd) { _stackmap_data = sd; } |
0 | 215 bool has_stackmap_table() const { return _stackmap_data != NULL; } |
216 | |
217 void init_fingerprint() { | |
218 const uint64_t initval = CONST64(0x8000000000000000); | |
219 _fingerprint = initval; | |
220 } | |
221 | |
222 uint64_t fingerprint() const { | |
223 // Since reads aren't atomic for 64 bits, if any of the high or low order | |
224 // word is the initial value, return 0. See init_fingerprint for initval. | |
225 uint high_fp = (uint)(_fingerprint >> 32); | |
226 if ((int) _fingerprint == 0 || high_fp == 0x80000000) { | |
227 return 0L; | |
228 } else { | |
229 return _fingerprint; | |
230 } | |
231 } | |
232 | |
233 uint64_t set_fingerprint(uint64_t new_fingerprint) { | |
234 #ifdef ASSERT | |
235 // Assert only valid if complete/valid 64 bit _fingerprint value is read. | |
236 uint64_t oldfp = fingerprint(); | |
237 #endif // ASSERT | |
238 _fingerprint = new_fingerprint; | |
239 assert(oldfp == 0L || new_fingerprint == oldfp, | |
240 "fingerprint cannot change"); | |
241 assert(((new_fingerprint >> 32) != 0x80000000) && (int)new_fingerprint !=0, | |
242 "fingerprint should call init to set initial value"); | |
243 return new_fingerprint; | |
244 } | |
245 | |
246 // name | |
247 int name_index() const { return _name_index; } | |
248 void set_name_index(int index) { _name_index = index; } | |
249 | |
250 // signature | |
251 int signature_index() const { return _signature_index; } | |
252 void set_signature_index(int index) { _signature_index = index; } | |
253 | |
254 // generics support | |
255 int generic_signature_index() const { return _generic_signature_index; } | |
256 void set_generic_signature_index(int index) { _generic_signature_index = index; } | |
257 | |
258 // Sizing | |
259 static int header_size() { | |
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260 return sizeof(ConstMethod)/HeapWordSize; |
0 | 261 } |
262 | |
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263 // Size needed |
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264 static int size(int code_size, int compressed_line_number_size, |
0 | 265 int local_variable_table_length, |
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266 int exception_table_length, |
0 | 267 int checked_exceptions_length); |
268 | |
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269 int size() const { return _constMethod_size;} |
0 | 270 void set_constMethod_size(int size) { _constMethod_size = size; } |
271 | |
272 // code size | |
273 int code_size() const { return _code_size; } | |
274 void set_code_size(int size) { | |
275 assert(max_method_code_size < (1 << 16), | |
276 "u2 is too small to hold method code size in general"); | |
277 assert(0 <= size && size <= max_method_code_size, "invalid code size"); | |
278 _code_size = size; | |
279 } | |
280 | |
281 // linenumber table - note that length is unknown until decompression, | |
282 // see class CompressedLineNumberReadStream. | |
283 u_char* compressed_linenumber_table() const; // not preserved by gc | |
284 u2* checked_exceptions_length_addr() const; | |
285 u2* localvariable_table_length_addr() const; | |
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286 u2* exception_table_length_addr() const; |
0 | 287 |
288 // checked exceptions | |
289 int checked_exceptions_length() const; | |
290 CheckedExceptionElement* checked_exceptions_start() const; | |
291 | |
292 // localvariable table | |
293 int localvariable_table_length() const; | |
294 LocalVariableTableElement* localvariable_table_start() const; | |
295 | |
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296 // exception table |
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297 int exception_table_length() const; |
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298 ExceptionTableElement* exception_table_start() const; |
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299 |
0 | 300 // byte codes |
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301 void set_code(address code) { |
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302 if (code_size() > 0) { |
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303 memcpy(code_base(), code, code_size()); |
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304 } |
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305 } |
0 | 306 address code_base() const { return (address) (this+1); } |
307 address code_end() const { return code_base() + code_size(); } | |
308 bool contains(address bcp) const { return code_base() <= bcp | |
309 && bcp < code_end(); } | |
310 // Offset to bytecodes | |
311 static ByteSize codes_offset() | |
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312 { return in_ByteSize(sizeof(ConstMethod)); } |
0 | 313 |
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314 static ByteSize constants_offset() |
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315 { return byte_offset_of(ConstMethod, _constants); } |
0 | 316 |
317 // Unique id for the method | |
318 static const u2 MAX_IDNUM; | |
319 static const u2 UNSET_IDNUM; | |
320 u2 method_idnum() const { return _method_idnum; } | |
321 void set_method_idnum(u2 idnum) { _method_idnum = idnum; } | |
322 | |
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323 // Deallocation for RedefineClasses |
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324 void deallocate_contents(ClassLoaderData* loader_data); |
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325 bool is_klass() const { return false; } |
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326 DEBUG_ONLY(bool on_stack() { return false; }) |
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327 |
0 | 328 private: |
329 // Since the size of the compressed line number table is unknown, the | |
330 // offsets of the other variable sized sections are computed backwards | |
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331 // from the end of the ConstMethod*. |
0 | 332 |
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333 // First byte after ConstMethod* |
0 | 334 address constMethod_end() const |
335 { return (address)((oop*)this + _constMethod_size); } | |
336 | |
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337 // Last short in ConstMethod* |
0 | 338 u2* last_u2_element() const |
339 { return (u2*)constMethod_end() - 1; } | |
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340 |
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341 public: |
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342 // Printing |
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343 void print_on (outputStream* st) const; |
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344 void print_value_on(outputStream* st) const; |
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345 |
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346 const char* internal_name() const { return "{constMethod}"; } |
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347 |
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348 // Verify |
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349 void verify_on(outputStream* st); |
0 | 350 }; |
1972 | 351 |
352 #endif // SHARE_VM_OOPS_CONSTMETHODOOP_HPP |