Mercurial > hg > graal-compiler
annotate src/share/vm/oops/constMethod.hpp @ 6781:b711844284e2
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author | nloodin |
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date | Fri, 21 Sep 2012 10:56:28 +0200 |
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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; |
111 private: | |
112 enum { | |
113 _has_linenumber_table = 1, | |
114 _has_checked_exceptions = 2, | |
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115 _has_localvariable_table = 4, |
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116 _has_exception_table = 8 |
0 | 117 }; |
118 | |
119 // Bit vector of signature | |
120 // Callers interpret 0=not initialized yet and | |
121 // -1=too many args to fix, must parse the slow way. | |
122 // The real initial value is special to account for nonatomicity of 64 bit | |
123 // loads and stores. This value may updated and read without a lock by | |
124 // multiple threads, so is volatile. | |
125 volatile uint64_t _fingerprint; | |
126 | |
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127 ConstantPool* _constants; // Constant pool |
0 | 128 |
129 // Raw stackmap data for the method | |
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130 Array<u1>* _stackmap_data; |
0 | 131 |
132 int _constMethod_size; | |
133 jbyte _interpreter_kind; | |
134 jbyte _flags; | |
135 | |
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136 // Size of Java bytecodes allocated immediately after Method*. |
0 | 137 u2 _code_size; |
138 u2 _name_index; // Method name (index in constant pool) | |
139 u2 _signature_index; // Method signature (index in constant pool) | |
140 u2 _method_idnum; // unique identification number for the method within the class | |
141 // initially corresponds to the index into the methods array. | |
142 // but this may change with redefinition | |
143 u2 _generic_signature_index; // Generic signature (index in constant pool, 0 if absent) | |
144 | |
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145 |
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146 // Constructor |
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147 ConstMethod(int byte_code_size, |
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148 int compressed_line_number_size, |
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149 int localvariable_table_length, |
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150 int exception_table_length, |
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151 int checked_exceptions_length, |
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152 int size); |
0 | 153 public: |
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154 static ConstMethod* allocate(ClassLoaderData* loader_data, |
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155 int byte_code_size, |
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156 int compressed_line_number_size, |
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157 int localvariable_table_length, |
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158 int exception_table_length, |
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159 int checked_exceptions_length, |
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160 TRAPS); |
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161 |
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162 bool is_constMethod() const { return true; } |
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163 |
0 | 164 // Inlined tables |
165 void set_inlined_tables_length(int checked_exceptions_len, | |
166 int compressed_line_number_size, | |
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167 int localvariable_table_len, |
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168 int exception_table_len); |
0 | 169 |
170 bool has_linenumber_table() const | |
171 { return (_flags & _has_linenumber_table) != 0; } | |
172 | |
173 bool has_checked_exceptions() const | |
174 { return (_flags & _has_checked_exceptions) != 0; } | |
175 | |
176 bool has_localvariable_table() const | |
177 { return (_flags & _has_localvariable_table) != 0; } | |
178 | |
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179 bool has_exception_handler() const |
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180 { return (_flags & _has_exception_table) != 0; } |
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181 |
0 | 182 void set_interpreter_kind(int kind) { _interpreter_kind = kind; } |
183 int interpreter_kind(void) const { return _interpreter_kind; } | |
184 | |
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185 // constant pool |
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186 ConstantPool* constants() const { return _constants; } |
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187 void set_constants(ConstantPool* c) { _constants = c; } |
0 | 188 |
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189 Method* method() const; |
0 | 190 |
191 // stackmap table data | |
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192 Array<u1>* stackmap_data() const { return _stackmap_data; } |
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193 void set_stackmap_data(Array<u1>* sd) { _stackmap_data = sd; } |
0 | 194 bool has_stackmap_table() const { return _stackmap_data != NULL; } |
195 | |
196 void init_fingerprint() { | |
197 const uint64_t initval = CONST64(0x8000000000000000); | |
198 _fingerprint = initval; | |
199 } | |
200 | |
201 uint64_t fingerprint() const { | |
202 // Since reads aren't atomic for 64 bits, if any of the high or low order | |
203 // word is the initial value, return 0. See init_fingerprint for initval. | |
204 uint high_fp = (uint)(_fingerprint >> 32); | |
205 if ((int) _fingerprint == 0 || high_fp == 0x80000000) { | |
206 return 0L; | |
207 } else { | |
208 return _fingerprint; | |
209 } | |
210 } | |
211 | |
212 uint64_t set_fingerprint(uint64_t new_fingerprint) { | |
213 #ifdef ASSERT | |
214 // Assert only valid if complete/valid 64 bit _fingerprint value is read. | |
215 uint64_t oldfp = fingerprint(); | |
216 #endif // ASSERT | |
217 _fingerprint = new_fingerprint; | |
218 assert(oldfp == 0L || new_fingerprint == oldfp, | |
219 "fingerprint cannot change"); | |
220 assert(((new_fingerprint >> 32) != 0x80000000) && (int)new_fingerprint !=0, | |
221 "fingerprint should call init to set initial value"); | |
222 return new_fingerprint; | |
223 } | |
224 | |
225 // name | |
226 int name_index() const { return _name_index; } | |
227 void set_name_index(int index) { _name_index = index; } | |
228 | |
229 // signature | |
230 int signature_index() const { return _signature_index; } | |
231 void set_signature_index(int index) { _signature_index = index; } | |
232 | |
233 // generics support | |
234 int generic_signature_index() const { return _generic_signature_index; } | |
235 void set_generic_signature_index(int index) { _generic_signature_index = index; } | |
236 | |
237 // Sizing | |
238 static int header_size() { | |
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239 return sizeof(ConstMethod)/HeapWordSize; |
0 | 240 } |
241 | |
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242 // Size needed |
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243 static int size(int code_size, int compressed_line_number_size, |
0 | 244 int local_variable_table_length, |
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245 int exception_table_length, |
0 | 246 int checked_exceptions_length); |
247 | |
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248 int size() const { return _constMethod_size;} |
0 | 249 void set_constMethod_size(int size) { _constMethod_size = size; } |
250 | |
251 // code size | |
252 int code_size() const { return _code_size; } | |
253 void set_code_size(int size) { | |
254 assert(max_method_code_size < (1 << 16), | |
255 "u2 is too small to hold method code size in general"); | |
256 assert(0 <= size && size <= max_method_code_size, "invalid code size"); | |
257 _code_size = size; | |
258 } | |
259 | |
260 // linenumber table - note that length is unknown until decompression, | |
261 // see class CompressedLineNumberReadStream. | |
262 u_char* compressed_linenumber_table() const; // not preserved by gc | |
263 u2* checked_exceptions_length_addr() const; | |
264 u2* localvariable_table_length_addr() const; | |
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265 u2* exception_table_length_addr() const; |
0 | 266 |
267 // checked exceptions | |
268 int checked_exceptions_length() const; | |
269 CheckedExceptionElement* checked_exceptions_start() const; | |
270 | |
271 // localvariable table | |
272 int localvariable_table_length() const; | |
273 LocalVariableTableElement* localvariable_table_start() const; | |
274 | |
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275 // exception table |
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276 int exception_table_length() const; |
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277 ExceptionTableElement* exception_table_start() const; |
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278 |
0 | 279 // byte codes |
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280 void set_code(address code) { |
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281 if (code_size() > 0) { |
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282 memcpy(code_base(), code, code_size()); |
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283 } |
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284 } |
0 | 285 address code_base() const { return (address) (this+1); } |
286 address code_end() const { return code_base() + code_size(); } | |
287 bool contains(address bcp) const { return code_base() <= bcp | |
288 && bcp < code_end(); } | |
289 // Offset to bytecodes | |
290 static ByteSize codes_offset() | |
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291 { return in_ByteSize(sizeof(ConstMethod)); } |
0 | 292 |
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293 static ByteSize constants_offset() |
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294 { return byte_offset_of(ConstMethod, _constants); } |
0 | 295 |
296 // Unique id for the method | |
297 static const u2 MAX_IDNUM; | |
298 static const u2 UNSET_IDNUM; | |
299 u2 method_idnum() const { return _method_idnum; } | |
300 void set_method_idnum(u2 idnum) { _method_idnum = idnum; } | |
301 | |
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302 // Deallocation for RedefineClasses |
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303 void deallocate_contents(ClassLoaderData* loader_data); |
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304 bool is_klass() const { return false; } |
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305 DEBUG_ONLY(bool on_stack() { return false; }) |
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306 |
0 | 307 private: |
308 // Since the size of the compressed line number table is unknown, the | |
309 // offsets of the other variable sized sections are computed backwards | |
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310 // from the end of the ConstMethod*. |
0 | 311 |
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312 // First byte after ConstMethod* |
0 | 313 address constMethod_end() const |
314 { return (address)((oop*)this + _constMethod_size); } | |
315 | |
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316 // Last short in ConstMethod* |
0 | 317 u2* last_u2_element() const |
318 { return (u2*)constMethod_end() - 1; } | |
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319 |
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320 public: |
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321 // Printing |
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322 void print_on (outputStream* st) const; |
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323 void print_value_on(outputStream* st) const; |
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324 |
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325 const char* internal_name() const { return "{constMethod}"; } |
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326 |
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327 // Verify |
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328 void verify_on(outputStream* st); |
0 | 329 }; |
1972 | 330 |
331 #endif // SHARE_VM_OOPS_CONSTMETHODOOP_HPP |