Mercurial > hg > graal-compiler
annotate src/share/vm/oops/constMethod.hpp @ 8002:8391fdd36e1f
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date | Sun, 27 Jan 2013 01:07:09 -0800 |
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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 // | method parameters elements + length (length last) | |
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81 // | (length is u2, elements are u2, u4 structures) | |
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82 // | (see class MethodParametersElement) | |
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83 // | (access flags bit tells whether table is present) | |
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84 // | (indexed from end of ConstMethod*) | |
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85 // |------------------------------------------------------| |
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86 // | generic signature index (u2) | |
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87 // | (indexed from start of constMethodOop) | |
0 | 88 // |------------------------------------------------------| |
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89 // |
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90 // IMPORTANT: If anything gets added here, there need to be changes to |
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91 // ensure that ServicabilityAgent doesn't get broken as a result! |
0 | 92 |
93 | |
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94 // Utitily class decribing elements in checked exceptions table inlined in Method*. |
0 | 95 class CheckedExceptionElement VALUE_OBJ_CLASS_SPEC { |
96 public: | |
97 u2 class_cp_index; | |
98 }; | |
99 | |
100 | |
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101 // Utitily class decribing elements in local variable table inlined in Method*. |
0 | 102 class LocalVariableTableElement VALUE_OBJ_CLASS_SPEC { |
103 public: | |
104 u2 start_bci; | |
105 u2 length; | |
106 u2 name_cp_index; | |
107 u2 descriptor_cp_index; | |
108 u2 signature_cp_index; | |
109 u2 slot; | |
110 }; | |
111 | |
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112 // Utitily class describing elements in exception table |
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113 class ExceptionTableElement VALUE_OBJ_CLASS_SPEC { |
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114 public: |
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115 u2 start_pc; |
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116 u2 end_pc; |
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117 u2 handler_pc; |
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118 u2 catch_type_index; |
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119 }; |
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120 |
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121 // Utility class describing elements in method parameters |
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122 class MethodParametersElement VALUE_OBJ_CLASS_SPEC { |
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123 public: |
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124 u2 name_cp_index; |
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125 // This has to happen, otherwise it will cause SIGBUS from a |
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126 // misaligned u4 on some architectures (ie SPARC) |
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127 // because MethodParametersElements are only aligned mod 2 |
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128 // within the ConstMethod container u2 flags_hi; |
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129 u2 flags_hi; |
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130 u2 flags_lo; |
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131 }; |
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132 |
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133 |
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134 class ConstMethod : public MetaspaceObj { |
0 | 135 friend class VMStructs; |
6934 | 136 |
137 public: | |
138 typedef enum { NORMAL, OVERPASS } MethodType; | |
139 | |
0 | 140 private: |
141 enum { | |
142 _has_linenumber_table = 1, | |
143 _has_checked_exceptions = 2, | |
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144 _has_localvariable_table = 4, |
6934 | 145 _has_exception_table = 8, |
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146 _has_generic_signature = 16, |
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147 _has_method_parameters = 32, |
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148 _is_overpass = 64 |
0 | 149 }; |
150 | |
151 // Bit vector of signature | |
152 // Callers interpret 0=not initialized yet and | |
153 // -1=too many args to fix, must parse the slow way. | |
154 // The real initial value is special to account for nonatomicity of 64 bit | |
155 // loads and stores. This value may updated and read without a lock by | |
156 // multiple threads, so is volatile. | |
157 volatile uint64_t _fingerprint; | |
158 | |
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159 ConstantPool* _constants; // Constant pool |
0 | 160 |
161 // Raw stackmap data for the method | |
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162 Array<u1>* _stackmap_data; |
0 | 163 |
164 int _constMethod_size; | |
165 jbyte _interpreter_kind; | |
166 jbyte _flags; | |
167 | |
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168 // Size of Java bytecodes allocated immediately after Method*. |
0 | 169 u2 _code_size; |
170 u2 _name_index; // Method name (index in constant pool) | |
171 u2 _signature_index; // Method signature (index in constant pool) | |
172 u2 _method_idnum; // unique identification number for the method within the class | |
173 // initially corresponds to the index into the methods array. | |
174 // but this may change with redefinition | |
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175 u2 _max_stack; // Maximum number of entries on the expression stack |
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176 u2 _max_locals; // Number of local variables used by this method |
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177 u2 _size_of_parameters; // size of the parameter block (receiver + arguments) in words |
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178 |
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179 // Constructor |
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180 ConstMethod(int byte_code_size, |
6934 | 181 int compressed_line_number_size, |
182 int localvariable_table_length, | |
183 int exception_table_length, | |
184 int checked_exceptions_length, | |
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185 int method_parameters_length, |
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186 u2 generic_signature_index, |
6934 | 187 MethodType is_overpass, |
188 int size); | |
0 | 189 public: |
6934 | 190 |
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191 static ConstMethod* allocate(ClassLoaderData* loader_data, |
6934 | 192 int byte_code_size, |
193 int compressed_line_number_size, | |
194 int localvariable_table_length, | |
195 int exception_table_length, | |
196 int checked_exceptions_length, | |
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197 int method_parameters_length, |
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198 u2 generic_signature_index, |
6934 | 199 MethodType mt, |
200 TRAPS); | |
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201 |
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202 bool is_constMethod() const { return true; } |
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203 |
0 | 204 // Inlined tables |
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205 void set_inlined_tables_length(u2 generic_signature_index, |
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206 int checked_exceptions_len, |
0 | 207 int compressed_line_number_size, |
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208 int localvariable_table_len, |
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209 int exception_table_len, |
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210 int method_parameters_length); |
0 | 211 |
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212 bool has_generic_signature() const |
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213 { return (_flags & _has_generic_signature) != 0; } |
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214 |
0 | 215 bool has_linenumber_table() const |
216 { return (_flags & _has_linenumber_table) != 0; } | |
217 | |
218 bool has_checked_exceptions() const | |
219 { return (_flags & _has_checked_exceptions) != 0; } | |
220 | |
221 bool has_localvariable_table() const | |
222 { return (_flags & _has_localvariable_table) != 0; } | |
223 | |
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224 bool has_exception_handler() const |
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225 { return (_flags & _has_exception_table) != 0; } |
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226 |
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227 bool has_method_parameters() const |
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228 { return (_flags & _has_method_parameters) != 0; } |
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229 |
6934 | 230 MethodType method_type() const { |
231 return ((_flags & _is_overpass) == 0) ? NORMAL : OVERPASS; | |
232 } | |
233 | |
234 void set_method_type(MethodType mt) { | |
235 if (mt == NORMAL) { | |
236 _flags &= ~(_is_overpass); | |
237 } else { | |
238 _flags |= _is_overpass; | |
239 } | |
240 } | |
241 | |
242 | |
0 | 243 void set_interpreter_kind(int kind) { _interpreter_kind = kind; } |
244 int interpreter_kind(void) const { return _interpreter_kind; } | |
245 | |
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246 // constant pool |
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247 ConstantPool* constants() const { return _constants; } |
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248 void set_constants(ConstantPool* c) { _constants = c; } |
0 | 249 |
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250 Method* method() const; |
0 | 251 |
252 // stackmap table data | |
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253 Array<u1>* stackmap_data() const { return _stackmap_data; } |
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254 void set_stackmap_data(Array<u1>* sd) { _stackmap_data = sd; } |
0 | 255 bool has_stackmap_table() const { return _stackmap_data != NULL; } |
256 | |
257 void init_fingerprint() { | |
258 const uint64_t initval = CONST64(0x8000000000000000); | |
259 _fingerprint = initval; | |
260 } | |
261 | |
262 uint64_t fingerprint() const { | |
263 // Since reads aren't atomic for 64 bits, if any of the high or low order | |
264 // word is the initial value, return 0. See init_fingerprint for initval. | |
265 uint high_fp = (uint)(_fingerprint >> 32); | |
266 if ((int) _fingerprint == 0 || high_fp == 0x80000000) { | |
267 return 0L; | |
268 } else { | |
269 return _fingerprint; | |
270 } | |
271 } | |
272 | |
273 uint64_t set_fingerprint(uint64_t new_fingerprint) { | |
274 #ifdef ASSERT | |
275 // Assert only valid if complete/valid 64 bit _fingerprint value is read. | |
276 uint64_t oldfp = fingerprint(); | |
277 #endif // ASSERT | |
278 _fingerprint = new_fingerprint; | |
279 assert(oldfp == 0L || new_fingerprint == oldfp, | |
280 "fingerprint cannot change"); | |
281 assert(((new_fingerprint >> 32) != 0x80000000) && (int)new_fingerprint !=0, | |
282 "fingerprint should call init to set initial value"); | |
283 return new_fingerprint; | |
284 } | |
285 | |
286 // name | |
287 int name_index() const { return _name_index; } | |
288 void set_name_index(int index) { _name_index = index; } | |
289 | |
290 // signature | |
291 int signature_index() const { return _signature_index; } | |
292 void set_signature_index(int index) { _signature_index = index; } | |
293 | |
294 // generics support | |
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295 int generic_signature_index() const { |
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296 if (has_generic_signature()) { |
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297 return *generic_signature_index_addr(); |
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298 } else { |
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299 return 0; |
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300 } |
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301 } |
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302 void set_generic_signature_index(u2 index) { |
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303 assert(has_generic_signature(), ""); |
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304 u2* addr = generic_signature_index_addr(); |
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305 *addr = index; |
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306 } |
0 | 307 |
308 // Sizing | |
309 static int header_size() { | |
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310 return sizeof(ConstMethod)/HeapWordSize; |
0 | 311 } |
312 | |
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313 // Size needed |
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314 static int size(int code_size, int compressed_line_number_size, |
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315 int local_variable_table_length, |
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316 int exception_table_length, |
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317 int checked_exceptions_length, |
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318 int method_parameters_length, |
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319 u2 generic_signature_index); |
0 | 320 |
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321 int size() const { return _constMethod_size;} |
0 | 322 void set_constMethod_size(int size) { _constMethod_size = size; } |
323 | |
324 // code size | |
325 int code_size() const { return _code_size; } | |
326 void set_code_size(int size) { | |
327 assert(max_method_code_size < (1 << 16), | |
328 "u2 is too small to hold method code size in general"); | |
329 assert(0 <= size && size <= max_method_code_size, "invalid code size"); | |
330 _code_size = size; | |
331 } | |
332 | |
333 // linenumber table - note that length is unknown until decompression, | |
334 // see class CompressedLineNumberReadStream. | |
335 u_char* compressed_linenumber_table() const; // not preserved by gc | |
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336 u2* generic_signature_index_addr() const; |
0 | 337 u2* checked_exceptions_length_addr() const; |
338 u2* localvariable_table_length_addr() const; | |
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339 u2* exception_table_length_addr() const; |
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340 u2* method_parameters_length_addr() const; |
0 | 341 |
342 // checked exceptions | |
343 int checked_exceptions_length() const; | |
344 CheckedExceptionElement* checked_exceptions_start() const; | |
345 | |
346 // localvariable table | |
347 int localvariable_table_length() const; | |
348 LocalVariableTableElement* localvariable_table_start() const; | |
349 | |
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350 // exception table |
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351 int exception_table_length() const; |
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352 ExceptionTableElement* exception_table_start() const; |
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353 |
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354 // method parameters table |
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355 int method_parameters_length() const; |
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356 MethodParametersElement* method_parameters_start() const; |
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357 |
0 | 358 // byte codes |
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359 void set_code(address code) { |
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360 if (code_size() > 0) { |
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361 memcpy(code_base(), code, code_size()); |
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362 } |
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363 } |
0 | 364 address code_base() const { return (address) (this+1); } |
365 address code_end() const { return code_base() + code_size(); } | |
366 bool contains(address bcp) const { return code_base() <= bcp | |
367 && bcp < code_end(); } | |
368 // Offset to bytecodes | |
369 static ByteSize codes_offset() | |
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370 { return in_ByteSize(sizeof(ConstMethod)); } |
0 | 371 |
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372 static ByteSize constants_offset() |
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373 { return byte_offset_of(ConstMethod, _constants); } |
0 | 374 |
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375 static ByteSize max_stack_offset() |
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376 { return byte_offset_of(ConstMethod, _max_stack); } |
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377 static ByteSize size_of_locals_offset() |
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378 { return byte_offset_of(ConstMethod, _max_locals); } |
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379 static ByteSize size_of_parameters_offset() |
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380 { return byte_offset_of(ConstMethod, _size_of_parameters); } |
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381 |
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382 |
0 | 383 // Unique id for the method |
384 static const u2 MAX_IDNUM; | |
385 static const u2 UNSET_IDNUM; | |
386 u2 method_idnum() const { return _method_idnum; } | |
387 void set_method_idnum(u2 idnum) { _method_idnum = idnum; } | |
388 | |
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389 // max stack |
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390 int max_stack() const { return _max_stack; } |
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391 void set_max_stack(int size) { _max_stack = size; } |
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392 |
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393 // max locals |
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394 int max_locals() const { return _max_locals; } |
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395 void set_max_locals(int size) { _max_locals = size; } |
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396 |
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397 // size of parameters |
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398 int size_of_parameters() const { return _size_of_parameters; } |
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399 void set_size_of_parameters(int size) { _size_of_parameters = size; } |
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400 |
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401 // Deallocation for RedefineClasses |
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402 void deallocate_contents(ClassLoaderData* loader_data); |
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403 bool is_klass() const { return false; } |
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404 DEBUG_ONLY(bool on_stack() { return false; }) |
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405 |
0 | 406 private: |
407 // Since the size of the compressed line number table is unknown, the | |
408 // offsets of the other variable sized sections are computed backwards | |
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409 // from the end of the ConstMethod*. |
0 | 410 |
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411 // First byte after ConstMethod* |
0 | 412 address constMethod_end() const |
413 { return (address)((oop*)this + _constMethod_size); } | |
414 | |
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415 // Last short in ConstMethod* |
0 | 416 u2* last_u2_element() const |
417 { return (u2*)constMethod_end() - 1; } | |
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418 |
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419 public: |
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420 // Printing |
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421 void print_on (outputStream* st) const; |
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422 void print_value_on(outputStream* st) const; |
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423 |
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424 const char* internal_name() const { return "{constMethod}"; } |
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425 |
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426 // Verify |
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427 void verify_on(outputStream* st); |
0 | 428 }; |
1972 | 429 |
430 #endif // SHARE_VM_OOPS_CONSTMETHODOOP_HPP |