Mercurial > hg > truffle
annotate src/share/vm/oops/constMethodOop.hpp @ 6267:977007096840
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Reviewed-by: kvn, twisti
| author | twisti |
|---|---|
| date | Fri, 27 Jul 2012 16:14:15 -0700 |
| parents | 8150fa46d2ed |
| children |
| 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 #include "oops/typeArrayOop.hpp" | |
| 30 | |
| 0 | 31 // An constMethodOop represents portions of a Java method which |
| 32 // do not vary. | |
| 33 // | |
| 34 // Memory layout (each line represents a word). Note that most | |
| 35 // applications load thousands of methods, so keeping the size of this | |
| 36 // structure small has a big impact on footprint. | |
| 37 // | |
| 38 // |------------------------------------------------------| | |
| 39 // | header | | |
| 40 // | klass | | |
| 41 // |------------------------------------------------------| | |
| 42 // | fingerprint 1 | | |
| 43 // | fingerprint 2 | | |
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44 // | constants (oop) | |
| 0 | 45 // | stackmap_data (oop) | |
| 46 // | constMethod_size | | |
| 47 // | interp_kind | flags | code_size | | |
| 48 // | name index | signature index | | |
| 49 // | method_idnum | generic_signature_index | | |
| 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) | | |
| 59 // | (indexed from start of constMethodOop) | | |
| 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 constMethodOop) | |
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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 constMethodOop) | |
| 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) | | |
| 78 // | (indexed from end of constMethodOop) | | |
| 79 // |------------------------------------------------------| | |
| 80 | |
| 81 | |
| 82 // Utitily class decribing elements in checked exceptions table inlined in methodOop. | |
| 83 class CheckedExceptionElement VALUE_OBJ_CLASS_SPEC { | |
| 84 public: | |
| 85 u2 class_cp_index; | |
| 86 }; | |
| 87 | |
| 88 | |
| 89 // Utitily class decribing elements in local variable table inlined in methodOop. | |
| 90 class LocalVariableTableElement VALUE_OBJ_CLASS_SPEC { | |
| 91 public: | |
| 92 u2 start_bci; | |
| 93 u2 length; | |
| 94 u2 name_cp_index; | |
| 95 u2 descriptor_cp_index; | |
| 96 u2 signature_cp_index; | |
| 97 u2 slot; | |
| 98 }; | |
| 99 | |
| 100 | |
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101 // Utitily class describing elements in exception table |
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102 class ExceptionTableElement VALUE_OBJ_CLASS_SPEC { |
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103 public: |
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104 u2 start_pc; |
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105 u2 end_pc; |
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106 u2 handler_pc; |
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107 u2 catch_type_index; |
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108 }; |
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109 |
| 0 | 110 class constMethodOopDesc : public oopDesc { |
| 111 friend class constMethodKlass; | |
| 112 friend class VMStructs; | |
| 113 private: | |
| 114 enum { | |
| 115 _has_linenumber_table = 1, | |
| 116 _has_checked_exceptions = 2, | |
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117 _has_localvariable_table = 4, |
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118 _has_exception_table = 8 |
| 0 | 119 }; |
| 120 | |
| 121 // Bit vector of signature | |
| 122 // Callers interpret 0=not initialized yet and | |
| 123 // -1=too many args to fix, must parse the slow way. | |
| 124 // The real initial value is special to account for nonatomicity of 64 bit | |
| 125 // loads and stores. This value may updated and read without a lock by | |
| 126 // multiple threads, so is volatile. | |
| 127 volatile uint64_t _fingerprint; | |
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128 volatile bool _is_conc_safe; // if true, safe for concurrent GC processing |
| 0 | 129 |
| 130 public: | |
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131 oop* oop_block_beg() const { return adr_constants(); } |
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132 oop* oop_block_end() const { return adr_stackmap_data() + 1; } |
| 0 | 133 |
| 134 private: | |
| 135 // | |
| 136 // The oop block. See comment in klass.hpp before making changes. | |
| 137 // | |
| 138 | |
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139 constantPoolOop _constants; // Constant pool |
| 0 | 140 |
| 141 // Raw stackmap data for the method | |
| 142 typeArrayOop _stackmap_data; | |
| 143 | |
| 144 // | |
| 145 // End of the oop block. | |
| 146 // | |
| 147 | |
| 148 int _constMethod_size; | |
| 149 jbyte _interpreter_kind; | |
| 150 jbyte _flags; | |
| 151 | |
| 152 // Size of Java bytecodes allocated immediately after methodOop. | |
| 153 u2 _code_size; | |
| 154 u2 _name_index; // Method name (index in constant pool) | |
| 155 u2 _signature_index; // Method signature (index in constant pool) | |
| 156 u2 _method_idnum; // unique identification number for the method within the class | |
| 157 // initially corresponds to the index into the methods array. | |
| 158 // but this may change with redefinition | |
| 159 u2 _generic_signature_index; // Generic signature (index in constant pool, 0 if absent) | |
| 160 | |
| 161 public: | |
| 162 // Inlined tables | |
| 163 void set_inlined_tables_length(int checked_exceptions_len, | |
| 164 int compressed_line_number_size, | |
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165 int localvariable_table_len, |
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166 int exception_table_len); |
| 0 | 167 |
| 168 bool has_linenumber_table() const | |
| 169 { return (_flags & _has_linenumber_table) != 0; } | |
| 170 | |
| 171 bool has_checked_exceptions() const | |
| 172 { return (_flags & _has_checked_exceptions) != 0; } | |
| 173 | |
| 174 bool has_localvariable_table() const | |
| 175 { return (_flags & _has_localvariable_table) != 0; } | |
| 176 | |
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177 bool has_exception_handler() const |
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178 { return (_flags & _has_exception_table) != 0; } |
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179 |
| 0 | 180 void set_interpreter_kind(int kind) { _interpreter_kind = kind; } |
| 181 int interpreter_kind(void) const { return _interpreter_kind; } | |
| 182 | |
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183 // constant pool |
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184 constantPoolOop constants() const { return _constants; } |
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185 void set_constants(constantPoolOop c) { |
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186 oop_store_without_check((oop*)&_constants, (oop)c); |
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187 } |
| 0 | 188 |
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189 methodOop method() const; |
| 0 | 190 |
| 191 // stackmap table data | |
| 192 typeArrayOop stackmap_data() const { return _stackmap_data; } | |
| 193 void set_stackmap_data(typeArrayOop sd) { | |
| 194 oop_store_without_check((oop*)&_stackmap_data, (oop)sd); | |
| 195 } | |
| 196 bool has_stackmap_table() const { return _stackmap_data != NULL; } | |
| 197 | |
| 198 void init_fingerprint() { | |
| 199 const uint64_t initval = CONST64(0x8000000000000000); | |
| 200 _fingerprint = initval; | |
| 201 } | |
| 202 | |
| 203 uint64_t fingerprint() const { | |
| 204 // Since reads aren't atomic for 64 bits, if any of the high or low order | |
| 205 // word is the initial value, return 0. See init_fingerprint for initval. | |
| 206 uint high_fp = (uint)(_fingerprint >> 32); | |
| 207 if ((int) _fingerprint == 0 || high_fp == 0x80000000) { | |
| 208 return 0L; | |
| 209 } else { | |
| 210 return _fingerprint; | |
| 211 } | |
| 212 } | |
| 213 | |
| 214 uint64_t set_fingerprint(uint64_t new_fingerprint) { | |
| 215 #ifdef ASSERT | |
| 216 // Assert only valid if complete/valid 64 bit _fingerprint value is read. | |
| 217 uint64_t oldfp = fingerprint(); | |
| 218 #endif // ASSERT | |
| 219 _fingerprint = new_fingerprint; | |
| 220 assert(oldfp == 0L || new_fingerprint == oldfp, | |
| 221 "fingerprint cannot change"); | |
| 222 assert(((new_fingerprint >> 32) != 0x80000000) && (int)new_fingerprint !=0, | |
| 223 "fingerprint should call init to set initial value"); | |
| 224 return new_fingerprint; | |
| 225 } | |
| 226 | |
| 227 // name | |
| 228 int name_index() const { return _name_index; } | |
| 229 void set_name_index(int index) { _name_index = index; } | |
| 230 | |
| 231 // signature | |
| 232 int signature_index() const { return _signature_index; } | |
| 233 void set_signature_index(int index) { _signature_index = index; } | |
| 234 | |
| 235 // generics support | |
| 236 int generic_signature_index() const { return _generic_signature_index; } | |
| 237 void set_generic_signature_index(int index) { _generic_signature_index = index; } | |
| 238 | |
| 239 // Sizing | |
| 240 static int header_size() { | |
| 241 return sizeof(constMethodOopDesc)/HeapWordSize; | |
| 242 } | |
| 243 | |
| 244 // Object size needed | |
| 245 static int object_size(int code_size, int compressed_line_number_size, | |
| 246 int local_variable_table_length, | |
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247 int exception_table_length, |
| 0 | 248 int checked_exceptions_length); |
| 249 | |
| 250 int object_size() const { return _constMethod_size; } | |
| 251 void set_constMethod_size(int size) { _constMethod_size = size; } | |
| 252 // Is object parsable by gc | |
| 253 bool object_is_parsable() { return object_size() > 0; } | |
| 254 | |
| 255 // code size | |
| 256 int code_size() const { return _code_size; } | |
| 257 void set_code_size(int size) { | |
| 258 assert(max_method_code_size < (1 << 16), | |
| 259 "u2 is too small to hold method code size in general"); | |
| 260 assert(0 <= size && size <= max_method_code_size, "invalid code size"); | |
| 261 _code_size = size; | |
| 262 } | |
| 263 | |
| 264 // linenumber table - note that length is unknown until decompression, | |
| 265 // see class CompressedLineNumberReadStream. | |
| 266 u_char* compressed_linenumber_table() const; // not preserved by gc | |
| 267 u2* checked_exceptions_length_addr() const; | |
| 268 u2* localvariable_table_length_addr() const; | |
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269 u2* exception_table_length_addr() const; |
| 0 | 270 |
| 271 // checked exceptions | |
| 272 int checked_exceptions_length() const; | |
| 273 CheckedExceptionElement* checked_exceptions_start() const; | |
| 274 | |
| 275 // localvariable table | |
| 276 int localvariable_table_length() const; | |
| 277 LocalVariableTableElement* localvariable_table_start() const; | |
| 278 | |
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279 // exception table |
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280 int exception_table_length() const; |
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281 ExceptionTableElement* exception_table_start() const; |
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282 |
| 0 | 283 // byte codes |
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284 void set_code(address code) { |
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285 if (code_size() > 0) { |
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286 memcpy(code_base(), code, code_size()); |
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287 } |
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288 } |
| 0 | 289 address code_base() const { return (address) (this+1); } |
| 290 address code_end() const { return code_base() + code_size(); } | |
| 291 bool contains(address bcp) const { return code_base() <= bcp | |
| 292 && bcp < code_end(); } | |
| 293 // Offset to bytecodes | |
| 294 static ByteSize codes_offset() | |
| 295 { return in_ByteSize(sizeof(constMethodOopDesc)); } | |
| 296 | |
| 297 // interpreter support | |
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298 static ByteSize constants_offset() |
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299 { return byte_offset_of(constMethodOopDesc, _constants); } |
| 0 | 300 |
| 301 // Garbage collection support | |
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302 oop* adr_constants() const { return (oop*)&_constants; } |
| 0 | 303 oop* adr_stackmap_data() const { return (oop*)&_stackmap_data; } |
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304 bool is_conc_safe() { return _is_conc_safe; } |
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305 void set_is_conc_safe(bool v) { _is_conc_safe = v; } |
| 0 | 306 |
| 307 // Unique id for the method | |
| 308 static const u2 MAX_IDNUM; | |
| 309 static const u2 UNSET_IDNUM; | |
| 310 u2 method_idnum() const { return _method_idnum; } | |
| 311 void set_method_idnum(u2 idnum) { _method_idnum = idnum; } | |
| 312 | |
| 313 private: | |
| 314 // Since the size of the compressed line number table is unknown, the | |
| 315 // offsets of the other variable sized sections are computed backwards | |
| 316 // from the end of the constMethodOop. | |
| 317 | |
| 318 // First byte after constMethodOop | |
| 319 address constMethod_end() const | |
| 320 { return (address)((oop*)this + _constMethod_size); } | |
| 321 | |
| 322 // Last short in constMethodOop | |
| 323 u2* last_u2_element() const | |
| 324 { return (u2*)constMethod_end() - 1; } | |
| 325 }; | |
| 1972 | 326 |
| 327 #endif // SHARE_VM_OOPS_CONSTMETHODOOP_HPP |