Mercurial > hg > truffle
annotate src/share/vm/oops/constMethodOop.hpp @ 6123:2fe087c3e814
7172967: Eliminate constMethod's _method backpointer to methodOop.
Summary: Eliminate constMethod's _method backpointer to methodOop, and move the _constant field from methodOop to constMethod.
Reviewed-by: roland, bdelsart, kamg
| author | jiangli |
|---|---|
| date | Wed, 06 Jun 2012 14:33:43 -0400 |
| parents | f95d63e2154a |
| children | 8150fa46d2ed |
| rev | line source |
|---|---|
| 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 // | exception_table (oop) | | |
| 47 // | constMethod_size | | |
| 48 // | interp_kind | flags | code_size | | |
| 49 // | name index | signature index | | |
| 50 // | method_idnum | generic_signature_index | | |
| 51 // |------------------------------------------------------| | |
| 52 // | | | |
| 53 // | byte codes | | |
| 54 // | | | |
| 55 // |------------------------------------------------------| | |
| 56 // | compressed linenumber table | | |
| 57 // | (see class CompressedLineNumberReadStream) | | |
| 58 // | (note that length is unknown until decompressed) | | |
| 59 // | (access flags bit tells whether table is present) | | |
| 60 // | (indexed from start of constMethodOop) | | |
| 61 // | (elements not necessarily sorted!) | | |
| 62 // |------------------------------------------------------| | |
| 63 // | localvariable table elements + length (length last) | | |
| 64 // | (length is u2, elements are 6-tuples of u2) | | |
| 65 // | (see class LocalVariableTableElement) | | |
| 66 // | (access flags bit tells whether table is present) | | |
| 67 // | (indexed from end of contMethodOop) | | |
| 68 // |------------------------------------------------------| | |
| 69 // | checked exceptions elements + length (length last) | | |
| 70 // | (length is u2, elements are u2) | | |
| 71 // | (see class CheckedExceptionElement) | | |
| 72 // | (access flags bit tells whether table is present) | | |
| 73 // | (indexed from end of constMethodOop) | | |
| 74 // |------------------------------------------------------| | |
| 75 | |
| 76 | |
| 77 // Utitily class decribing elements in checked exceptions table inlined in methodOop. | |
| 78 class CheckedExceptionElement VALUE_OBJ_CLASS_SPEC { | |
| 79 public: | |
| 80 u2 class_cp_index; | |
| 81 }; | |
| 82 | |
| 83 | |
| 84 // Utitily class decribing elements in local variable table inlined in methodOop. | |
| 85 class LocalVariableTableElement VALUE_OBJ_CLASS_SPEC { | |
| 86 public: | |
| 87 u2 start_bci; | |
| 88 u2 length; | |
| 89 u2 name_cp_index; | |
| 90 u2 descriptor_cp_index; | |
| 91 u2 signature_cp_index; | |
| 92 u2 slot; | |
| 93 }; | |
| 94 | |
| 95 | |
| 96 class constMethodOopDesc : public oopDesc { | |
| 97 friend class constMethodKlass; | |
| 98 friend class VMStructs; | |
| 99 private: | |
| 100 enum { | |
| 101 _has_linenumber_table = 1, | |
| 102 _has_checked_exceptions = 2, | |
| 103 _has_localvariable_table = 4 | |
| 104 }; | |
| 105 | |
| 106 // Bit vector of signature | |
| 107 // Callers interpret 0=not initialized yet and | |
| 108 // -1=too many args to fix, must parse the slow way. | |
| 109 // The real initial value is special to account for nonatomicity of 64 bit | |
| 110 // loads and stores. This value may updated and read without a lock by | |
| 111 // multiple threads, so is volatile. | |
| 112 volatile uint64_t _fingerprint; | |
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113 volatile bool _is_conc_safe; // if true, safe for concurrent GC processing |
| 0 | 114 |
| 115 public: | |
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116 oop* oop_block_beg() const { return adr_constants(); } |
| 0 | 117 oop* oop_block_end() const { return adr_exception_table() + 1; } |
| 118 | |
| 119 private: | |
| 120 // | |
| 121 // The oop block. See comment in klass.hpp before making changes. | |
| 122 // | |
| 123 | |
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124 constantPoolOop _constants; // Constant pool |
| 0 | 125 |
| 126 // Raw stackmap data for the method | |
| 127 typeArrayOop _stackmap_data; | |
| 128 | |
| 129 // The exception handler table. 4-tuples of ints [start_pc, end_pc, | |
| 130 // handler_pc, catch_type index] For methods with no exceptions the | |
| 131 // table is pointing to Universe::the_empty_int_array | |
| 132 typeArrayOop _exception_table; | |
| 133 | |
| 134 // | |
| 135 // End of the oop block. | |
| 136 // | |
| 137 | |
| 138 int _constMethod_size; | |
| 139 jbyte _interpreter_kind; | |
| 140 jbyte _flags; | |
| 141 | |
| 142 // Size of Java bytecodes allocated immediately after methodOop. | |
| 143 u2 _code_size; | |
| 144 u2 _name_index; // Method name (index in constant pool) | |
| 145 u2 _signature_index; // Method signature (index in constant pool) | |
| 146 u2 _method_idnum; // unique identification number for the method within the class | |
| 147 // initially corresponds to the index into the methods array. | |
| 148 // but this may change with redefinition | |
| 149 u2 _generic_signature_index; // Generic signature (index in constant pool, 0 if absent) | |
| 150 | |
| 151 public: | |
| 152 // Inlined tables | |
| 153 void set_inlined_tables_length(int checked_exceptions_len, | |
| 154 int compressed_line_number_size, | |
| 155 int localvariable_table_len); | |
| 156 | |
| 157 bool has_linenumber_table() const | |
| 158 { return (_flags & _has_linenumber_table) != 0; } | |
| 159 | |
| 160 bool has_checked_exceptions() const | |
| 161 { return (_flags & _has_checked_exceptions) != 0; } | |
| 162 | |
| 163 bool has_localvariable_table() const | |
| 164 { return (_flags & _has_localvariable_table) != 0; } | |
| 165 | |
| 166 void set_interpreter_kind(int kind) { _interpreter_kind = kind; } | |
| 167 int interpreter_kind(void) const { return _interpreter_kind; } | |
| 168 | |
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6123
2fe087c3e814
7172967: Eliminate constMethod's _method backpointer to methodOop.
jiangli
parents:
1972
diff
changeset
|
169 // constant pool |
|
2fe087c3e814
7172967: Eliminate constMethod's _method backpointer to methodOop.
jiangli
parents:
1972
diff
changeset
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170 constantPoolOop constants() const { return _constants; } |
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2fe087c3e814
7172967: Eliminate constMethod's _method backpointer to methodOop.
jiangli
parents:
1972
diff
changeset
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171 void set_constants(constantPoolOop c) { |
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7172967: Eliminate constMethod's _method backpointer to methodOop.
jiangli
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172 oop_store_without_check((oop*)&_constants, (oop)c); |
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7172967: Eliminate constMethod's _method backpointer to methodOop.
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173 } |
| 0 | 174 |
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175 methodOop method() const; |
| 0 | 176 |
| 177 // stackmap table data | |
| 178 typeArrayOop stackmap_data() const { return _stackmap_data; } | |
| 179 void set_stackmap_data(typeArrayOop sd) { | |
| 180 oop_store_without_check((oop*)&_stackmap_data, (oop)sd); | |
| 181 } | |
| 182 bool has_stackmap_table() const { return _stackmap_data != NULL; } | |
| 183 | |
| 184 // exception handler table | |
| 185 typeArrayOop exception_table() const { return _exception_table; } | |
| 186 void set_exception_table(typeArrayOop e) { oop_store_without_check((oop*) &_exception_table, (oop) e); } | |
| 187 bool has_exception_handler() const { return exception_table() != NULL && exception_table()->length() > 0; } | |
| 188 | |
| 189 void init_fingerprint() { | |
| 190 const uint64_t initval = CONST64(0x8000000000000000); | |
| 191 _fingerprint = initval; | |
| 192 } | |
| 193 | |
| 194 uint64_t fingerprint() const { | |
| 195 // Since reads aren't atomic for 64 bits, if any of the high or low order | |
| 196 // word is the initial value, return 0. See init_fingerprint for initval. | |
| 197 uint high_fp = (uint)(_fingerprint >> 32); | |
| 198 if ((int) _fingerprint == 0 || high_fp == 0x80000000) { | |
| 199 return 0L; | |
| 200 } else { | |
| 201 return _fingerprint; | |
| 202 } | |
| 203 } | |
| 204 | |
| 205 uint64_t set_fingerprint(uint64_t new_fingerprint) { | |
| 206 #ifdef ASSERT | |
| 207 // Assert only valid if complete/valid 64 bit _fingerprint value is read. | |
| 208 uint64_t oldfp = fingerprint(); | |
| 209 #endif // ASSERT | |
| 210 _fingerprint = new_fingerprint; | |
| 211 assert(oldfp == 0L || new_fingerprint == oldfp, | |
| 212 "fingerprint cannot change"); | |
| 213 assert(((new_fingerprint >> 32) != 0x80000000) && (int)new_fingerprint !=0, | |
| 214 "fingerprint should call init to set initial value"); | |
| 215 return new_fingerprint; | |
| 216 } | |
| 217 | |
| 218 // name | |
| 219 int name_index() const { return _name_index; } | |
| 220 void set_name_index(int index) { _name_index = index; } | |
| 221 | |
| 222 // signature | |
| 223 int signature_index() const { return _signature_index; } | |
| 224 void set_signature_index(int index) { _signature_index = index; } | |
| 225 | |
| 226 // generics support | |
| 227 int generic_signature_index() const { return _generic_signature_index; } | |
| 228 void set_generic_signature_index(int index) { _generic_signature_index = index; } | |
| 229 | |
| 230 // Sizing | |
| 231 static int header_size() { | |
| 232 return sizeof(constMethodOopDesc)/HeapWordSize; | |
| 233 } | |
| 234 | |
| 235 // Object size needed | |
| 236 static int object_size(int code_size, int compressed_line_number_size, | |
| 237 int local_variable_table_length, | |
| 238 int checked_exceptions_length); | |
| 239 | |
| 240 int object_size() const { return _constMethod_size; } | |
| 241 void set_constMethod_size(int size) { _constMethod_size = size; } | |
| 242 // Is object parsable by gc | |
| 243 bool object_is_parsable() { return object_size() > 0; } | |
| 244 | |
| 245 // code size | |
| 246 int code_size() const { return _code_size; } | |
| 247 void set_code_size(int size) { | |
| 248 assert(max_method_code_size < (1 << 16), | |
| 249 "u2 is too small to hold method code size in general"); | |
| 250 assert(0 <= size && size <= max_method_code_size, "invalid code size"); | |
| 251 _code_size = size; | |
| 252 } | |
| 253 | |
| 254 // linenumber table - note that length is unknown until decompression, | |
| 255 // see class CompressedLineNumberReadStream. | |
| 256 u_char* compressed_linenumber_table() const; // not preserved by gc | |
| 257 u2* checked_exceptions_length_addr() const; | |
| 258 u2* localvariable_table_length_addr() const; | |
| 259 | |
| 260 // checked exceptions | |
| 261 int checked_exceptions_length() const; | |
| 262 CheckedExceptionElement* checked_exceptions_start() const; | |
| 263 | |
| 264 // localvariable table | |
| 265 int localvariable_table_length() const; | |
| 266 LocalVariableTableElement* localvariable_table_start() const; | |
| 267 | |
| 268 // byte codes | |
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269 void set_code(address code) { |
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270 if (code_size() > 0) { |
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271 memcpy(code_base(), code, code_size()); |
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272 } |
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273 } |
| 0 | 274 address code_base() const { return (address) (this+1); } |
| 275 address code_end() const { return code_base() + code_size(); } | |
| 276 bool contains(address bcp) const { return code_base() <= bcp | |
| 277 && bcp < code_end(); } | |
| 278 // Offset to bytecodes | |
| 279 static ByteSize codes_offset() | |
| 280 { return in_ByteSize(sizeof(constMethodOopDesc)); } | |
| 281 | |
| 282 // interpreter support | |
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283 static ByteSize constants_offset() |
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284 { return byte_offset_of(constMethodOopDesc, _constants); } |
| 0 | 285 static ByteSize exception_table_offset() |
| 286 { return byte_offset_of(constMethodOopDesc, _exception_table); } | |
| 287 | |
| 288 // Garbage collection support | |
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289 oop* adr_constants() const { return (oop*)&_constants; } |
| 0 | 290 oop* adr_stackmap_data() const { return (oop*)&_stackmap_data; } |
| 291 oop* adr_exception_table() const { return (oop*)&_exception_table; } | |
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292 bool is_conc_safe() { return _is_conc_safe; } |
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293 void set_is_conc_safe(bool v) { _is_conc_safe = v; } |
| 0 | 294 |
| 295 // Unique id for the method | |
| 296 static const u2 MAX_IDNUM; | |
| 297 static const u2 UNSET_IDNUM; | |
| 298 u2 method_idnum() const { return _method_idnum; } | |
| 299 void set_method_idnum(u2 idnum) { _method_idnum = idnum; } | |
| 300 | |
| 301 private: | |
| 302 // Since the size of the compressed line number table is unknown, the | |
| 303 // offsets of the other variable sized sections are computed backwards | |
| 304 // from the end of the constMethodOop. | |
| 305 | |
| 306 // First byte after constMethodOop | |
| 307 address constMethod_end() const | |
| 308 { return (address)((oop*)this + _constMethod_size); } | |
| 309 | |
| 310 // Last short in constMethodOop | |
| 311 u2* last_u2_element() const | |
| 312 { return (u2*)constMethod_end() - 1; } | |
| 313 }; | |
| 1972 | 314 |
| 315 #endif // SHARE_VM_OOPS_CONSTMETHODOOP_HPP |