Mercurial > hg > truffle
annotate src/share/vm/oops/constMethod.hpp @ 7402:fd74228fd5ca
8004076: Move _max_locals and _size_of_parameters to ConstMethod for better sharing.
Summary: Move _max_locals and _size_of_parameters to ConstMethod for better sharing.
Reviewed-by: coleenp, minqi, jrose
author | jiangli |
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date | Tue, 11 Dec 2012 12:41:31 -0500 |
parents | b2dbd323c668 |
children | ade95d680b42 |
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 | |
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49 // | max_locals | size_of_parameters | |
0 | 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) | | |
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59 // | (indexed from start of ConstMethod*) | |
0 | 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 ConstMethod*) | |
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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 ConstMethod*) | |
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) | | |
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78 // | (indexed from end of ConstMethod*) | |
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79 // |------------------------------------------------------| |
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80 // | generic signature index (u2) | |
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81 // | (indexed from start of constMethodOop) | |
0 | 82 // |------------------------------------------------------| |
83 | |
84 | |
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85 // Utitily class decribing elements in checked exceptions table inlined in Method*. |
0 | 86 class CheckedExceptionElement VALUE_OBJ_CLASS_SPEC { |
87 public: | |
88 u2 class_cp_index; | |
89 }; | |
90 | |
91 | |
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92 // Utitily class decribing elements in local variable table inlined in Method*. |
0 | 93 class LocalVariableTableElement VALUE_OBJ_CLASS_SPEC { |
94 public: | |
95 u2 start_bci; | |
96 u2 length; | |
97 u2 name_cp_index; | |
98 u2 descriptor_cp_index; | |
99 u2 signature_cp_index; | |
100 u2 slot; | |
101 }; | |
102 | |
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103 // Utitily class describing elements in exception table |
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104 class ExceptionTableElement VALUE_OBJ_CLASS_SPEC { |
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105 public: |
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106 u2 start_pc; |
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107 u2 end_pc; |
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108 u2 handler_pc; |
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109 u2 catch_type_index; |
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110 }; |
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111 |
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112 |
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113 class ConstMethod : public MetaspaceObj { |
0 | 114 friend class VMStructs; |
6934 | 115 |
116 public: | |
117 typedef enum { NORMAL, OVERPASS } MethodType; | |
118 | |
0 | 119 private: |
120 enum { | |
121 _has_linenumber_table = 1, | |
122 _has_checked_exceptions = 2, | |
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123 _has_localvariable_table = 4, |
6934 | 124 _has_exception_table = 8, |
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125 _has_generic_signature = 16, |
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126 _is_overpass = 32 |
0 | 127 }; |
128 | |
129 // Bit vector of signature | |
130 // Callers interpret 0=not initialized yet and | |
131 // -1=too many args to fix, must parse the slow way. | |
132 // The real initial value is special to account for nonatomicity of 64 bit | |
133 // loads and stores. This value may updated and read without a lock by | |
134 // multiple threads, so is volatile. | |
135 volatile uint64_t _fingerprint; | |
136 | |
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137 ConstantPool* _constants; // Constant pool |
0 | 138 |
139 // Raw stackmap data for the method | |
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140 Array<u1>* _stackmap_data; |
0 | 141 |
142 int _constMethod_size; | |
143 jbyte _interpreter_kind; | |
144 jbyte _flags; | |
145 | |
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146 // Size of Java bytecodes allocated immediately after Method*. |
0 | 147 u2 _code_size; |
148 u2 _name_index; // Method name (index in constant pool) | |
149 u2 _signature_index; // Method signature (index in constant pool) | |
150 u2 _method_idnum; // unique identification number for the method within the class | |
151 // initially corresponds to the index into the methods array. | |
152 // but this may change with redefinition | |
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153 u2 _max_stack; // Maximum number of entries on the expression stack |
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154 u2 _max_locals; // Number of local variables used by this method |
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155 u2 _size_of_parameters; // size of the parameter block (receiver + arguments) in words |
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156 |
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157 // Constructor |
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158 ConstMethod(int byte_code_size, |
6934 | 159 int compressed_line_number_size, |
160 int localvariable_table_length, | |
161 int exception_table_length, | |
162 int checked_exceptions_length, | |
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163 u2 generic_signature_index, |
6934 | 164 MethodType is_overpass, |
165 int size); | |
0 | 166 public: |
6934 | 167 |
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168 static ConstMethod* allocate(ClassLoaderData* loader_data, |
6934 | 169 int byte_code_size, |
170 int compressed_line_number_size, | |
171 int localvariable_table_length, | |
172 int exception_table_length, | |
173 int checked_exceptions_length, | |
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174 u2 generic_signature_index, |
6934 | 175 MethodType mt, |
176 TRAPS); | |
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177 |
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178 bool is_constMethod() const { return true; } |
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179 |
0 | 180 // Inlined tables |
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181 void set_inlined_tables_length(u2 generic_signature_index, |
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182 int checked_exceptions_len, |
0 | 183 int compressed_line_number_size, |
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184 int localvariable_table_len, |
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185 int exception_table_len); |
0 | 186 |
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187 bool has_generic_signature() const |
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188 { return (_flags & _has_generic_signature) != 0; } |
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189 |
0 | 190 bool has_linenumber_table() const |
191 { return (_flags & _has_linenumber_table) != 0; } | |
192 | |
193 bool has_checked_exceptions() const | |
194 { return (_flags & _has_checked_exceptions) != 0; } | |
195 | |
196 bool has_localvariable_table() const | |
197 { return (_flags & _has_localvariable_table) != 0; } | |
198 | |
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199 bool has_exception_handler() const |
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200 { return (_flags & _has_exception_table) != 0; } |
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201 |
6934 | 202 MethodType method_type() const { |
203 return ((_flags & _is_overpass) == 0) ? NORMAL : OVERPASS; | |
204 } | |
205 | |
206 void set_method_type(MethodType mt) { | |
207 if (mt == NORMAL) { | |
208 _flags &= ~(_is_overpass); | |
209 } else { | |
210 _flags |= _is_overpass; | |
211 } | |
212 } | |
213 | |
214 | |
0 | 215 void set_interpreter_kind(int kind) { _interpreter_kind = kind; } |
216 int interpreter_kind(void) const { return _interpreter_kind; } | |
217 | |
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218 // constant pool |
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219 ConstantPool* constants() const { return _constants; } |
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220 void set_constants(ConstantPool* c) { _constants = c; } |
0 | 221 |
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222 Method* method() const; |
0 | 223 |
224 // stackmap table data | |
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225 Array<u1>* stackmap_data() const { return _stackmap_data; } |
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226 void set_stackmap_data(Array<u1>* sd) { _stackmap_data = sd; } |
0 | 227 bool has_stackmap_table() const { return _stackmap_data != NULL; } |
228 | |
229 void init_fingerprint() { | |
230 const uint64_t initval = CONST64(0x8000000000000000); | |
231 _fingerprint = initval; | |
232 } | |
233 | |
234 uint64_t fingerprint() const { | |
235 // Since reads aren't atomic for 64 bits, if any of the high or low order | |
236 // word is the initial value, return 0. See init_fingerprint for initval. | |
237 uint high_fp = (uint)(_fingerprint >> 32); | |
238 if ((int) _fingerprint == 0 || high_fp == 0x80000000) { | |
239 return 0L; | |
240 } else { | |
241 return _fingerprint; | |
242 } | |
243 } | |
244 | |
245 uint64_t set_fingerprint(uint64_t new_fingerprint) { | |
246 #ifdef ASSERT | |
247 // Assert only valid if complete/valid 64 bit _fingerprint value is read. | |
248 uint64_t oldfp = fingerprint(); | |
249 #endif // ASSERT | |
250 _fingerprint = new_fingerprint; | |
251 assert(oldfp == 0L || new_fingerprint == oldfp, | |
252 "fingerprint cannot change"); | |
253 assert(((new_fingerprint >> 32) != 0x80000000) && (int)new_fingerprint !=0, | |
254 "fingerprint should call init to set initial value"); | |
255 return new_fingerprint; | |
256 } | |
257 | |
258 // name | |
259 int name_index() const { return _name_index; } | |
260 void set_name_index(int index) { _name_index = index; } | |
261 | |
262 // signature | |
263 int signature_index() const { return _signature_index; } | |
264 void set_signature_index(int index) { _signature_index = index; } | |
265 | |
266 // generics support | |
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267 int generic_signature_index() const { |
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268 if (has_generic_signature()) { |
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269 return *generic_signature_index_addr(); |
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270 } else { |
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271 return 0; |
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272 } |
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273 } |
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274 void set_generic_signature_index(u2 index) { |
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275 assert(has_generic_signature(), ""); |
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276 u2* addr = generic_signature_index_addr(); |
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277 *addr = index; |
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278 } |
0 | 279 |
280 // Sizing | |
281 static int header_size() { | |
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282 return sizeof(ConstMethod)/HeapWordSize; |
0 | 283 } |
284 | |
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285 // Size needed |
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286 static int size(int code_size, int compressed_line_number_size, |
0 | 287 int local_variable_table_length, |
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288 int exception_table_length, |
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289 int checked_exceptions_length, |
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290 u2 generic_signature_index); |
0 | 291 |
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292 int size() const { return _constMethod_size;} |
0 | 293 void set_constMethod_size(int size) { _constMethod_size = size; } |
294 | |
295 // code size | |
296 int code_size() const { return _code_size; } | |
297 void set_code_size(int size) { | |
298 assert(max_method_code_size < (1 << 16), | |
299 "u2 is too small to hold method code size in general"); | |
300 assert(0 <= size && size <= max_method_code_size, "invalid code size"); | |
301 _code_size = size; | |
302 } | |
303 | |
304 // linenumber table - note that length is unknown until decompression, | |
305 // see class CompressedLineNumberReadStream. | |
306 u_char* compressed_linenumber_table() const; // not preserved by gc | |
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307 u2* generic_signature_index_addr() const; |
0 | 308 u2* checked_exceptions_length_addr() const; |
309 u2* localvariable_table_length_addr() const; | |
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310 u2* exception_table_length_addr() const; |
0 | 311 |
312 // checked exceptions | |
313 int checked_exceptions_length() const; | |
314 CheckedExceptionElement* checked_exceptions_start() const; | |
315 | |
316 // localvariable table | |
317 int localvariable_table_length() const; | |
318 LocalVariableTableElement* localvariable_table_start() const; | |
319 | |
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320 // exception table |
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321 int exception_table_length() const; |
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322 ExceptionTableElement* exception_table_start() const; |
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323 |
0 | 324 // byte codes |
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325 void set_code(address code) { |
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326 if (code_size() > 0) { |
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327 memcpy(code_base(), code, code_size()); |
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328 } |
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329 } |
0 | 330 address code_base() const { return (address) (this+1); } |
331 address code_end() const { return code_base() + code_size(); } | |
332 bool contains(address bcp) const { return code_base() <= bcp | |
333 && bcp < code_end(); } | |
334 // Offset to bytecodes | |
335 static ByteSize codes_offset() | |
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336 { return in_ByteSize(sizeof(ConstMethod)); } |
0 | 337 |
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338 static ByteSize constants_offset() |
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339 { return byte_offset_of(ConstMethod, _constants); } |
0 | 340 |
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341 static ByteSize max_stack_offset() |
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342 { return byte_offset_of(ConstMethod, _max_stack); } |
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343 static ByteSize size_of_locals_offset() |
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344 { return byte_offset_of(ConstMethod, _max_locals); } |
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345 static ByteSize size_of_parameters_offset() |
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346 { return byte_offset_of(ConstMethod, _size_of_parameters); } |
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347 |
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348 |
0 | 349 // Unique id for the method |
350 static const u2 MAX_IDNUM; | |
351 static const u2 UNSET_IDNUM; | |
352 u2 method_idnum() const { return _method_idnum; } | |
353 void set_method_idnum(u2 idnum) { _method_idnum = idnum; } | |
354 | |
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355 // max stack |
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356 int max_stack() const { return _max_stack; } |
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357 void set_max_stack(int size) { _max_stack = size; } |
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358 |
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359 // max locals |
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360 int max_locals() const { return _max_locals; } |
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361 void set_max_locals(int size) { _max_locals = size; } |
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362 |
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363 // size of parameters |
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364 int size_of_parameters() const { return _size_of_parameters; } |
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365 void set_size_of_parameters(int size) { _size_of_parameters = size; } |
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366 |
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367 // Deallocation for RedefineClasses |
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368 void deallocate_contents(ClassLoaderData* loader_data); |
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369 bool is_klass() const { return false; } |
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370 DEBUG_ONLY(bool on_stack() { return false; }) |
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371 |
0 | 372 private: |
373 // Since the size of the compressed line number table is unknown, the | |
374 // offsets of the other variable sized sections are computed backwards | |
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375 // from the end of the ConstMethod*. |
0 | 376 |
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377 // First byte after ConstMethod* |
0 | 378 address constMethod_end() const |
379 { return (address)((oop*)this + _constMethod_size); } | |
380 | |
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381 // Last short in ConstMethod* |
0 | 382 u2* last_u2_element() const |
383 { return (u2*)constMethod_end() - 1; } | |
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384 |
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385 public: |
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386 // Printing |
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387 void print_on (outputStream* st) const; |
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388 void print_value_on(outputStream* st) const; |
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389 |
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390 const char* internal_name() const { return "{constMethod}"; } |
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391 |
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392 // Verify |
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393 void verify_on(outputStream* st); |
0 | 394 }; |
1972 | 395 |
396 #endif // SHARE_VM_OOPS_CONSTMETHODOOP_HPP |