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comparison src/share/vm/oops/constMethod.hpp @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents src/share/vm/oops/constMethodOop.hpp@8150fa46d2ed
children 4735d2c84362
comparison
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6724:36d1d483d5d6 6725:da91efe96a93
1 /*
2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_OOPS_CONSTMETHODOOP_HPP
26 #define SHARE_VM_OOPS_CONSTMETHODOOP_HPP
27
28 #include "oops/oop.hpp"
29
30 // An ConstMethod* represents portions of a Java method which
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 |
43 // | constants (oop) |
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) |
58 // | (indexed from start of ConstMethod*) |
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) |
65 // | (indexed from end of ConstMethod*) |
66 // |------------------------------------------------------|
67 // | exception table + length (length last) |
68 // | (length is u2, elements are 4-tuples of u2) |
69 // | (see class ExceptionTableElement) |
70 // | (access flags bit tells whether table is present) |
71 // | (indexed from end of ConstMethod*) |
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) |
77 // | (indexed from end of ConstMethod*) |
78 // |------------------------------------------------------|
79
80
81 // Utitily class decribing elements in checked exceptions table inlined in Method*.
82 class CheckedExceptionElement VALUE_OBJ_CLASS_SPEC {
83 public:
84 u2 class_cp_index;
85 };
86
87
88 // Utitily class decribing elements in local variable table inlined in Method*.
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
99 // Utitily class describing elements in exception table
100 class ExceptionTableElement VALUE_OBJ_CLASS_SPEC {
101 public:
102 u2 start_pc;
103 u2 end_pc;
104 u2 handler_pc;
105 u2 catch_type_index;
106 };
107
108
109 class ConstMethod : public MetaspaceObj {
110 friend class VMStructs;
111 private:
112 enum {
113 _has_linenumber_table = 1,
114 _has_checked_exceptions = 2,
115 _has_localvariable_table = 4,
116 _has_exception_table = 8
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
127 ConstantPool* _constants; // Constant pool
128
129 // Raw stackmap data for the method
130 Array<u1>* _stackmap_data;
131
132 int _constMethod_size;
133 jbyte _interpreter_kind;
134 jbyte _flags;
135
136 // Size of Java bytecodes allocated immediately after Method*.
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
145
146 // Constructor
147 ConstMethod(int byte_code_size,
148 int compressed_line_number_size,
149 int localvariable_table_length,
150 int exception_table_length,
151 int checked_exceptions_length,
152 int size);
153 public:
154 static ConstMethod* allocate(ClassLoaderData* loader_data,
155 int byte_code_size,
156 int compressed_line_number_size,
157 int localvariable_table_length,
158 int exception_table_length,
159 int checked_exceptions_length,
160 TRAPS);
161
162 bool is_constMethod() const { return true; }
163
164 // Inlined tables
165 void set_inlined_tables_length(int checked_exceptions_len,
166 int compressed_line_number_size,
167 int localvariable_table_len,
168 int exception_table_len);
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
179 bool has_exception_handler() const
180 { return (_flags & _has_exception_table) != 0; }
181
182 void set_interpreter_kind(int kind) { _interpreter_kind = kind; }
183 int interpreter_kind(void) const { return _interpreter_kind; }
184
185 // constant pool
186 ConstantPool* constants() const { return _constants; }
187 void set_constants(ConstantPool* c) { _constants = c; }
188
189 Method* method() const;
190
191 // stackmap table data
192 Array<u1>* stackmap_data() const { return _stackmap_data; }
193 void set_stackmap_data(Array<u1>* sd) { _stackmap_data = sd; }
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() {
239 return sizeof(ConstMethod)/HeapWordSize;
240 }
241
242 // Size needed
243 static int size(int code_size, int compressed_line_number_size,
244 int local_variable_table_length,
245 int exception_table_length,
246 int checked_exceptions_length);
247
248 int size() const { return _constMethod_size;}
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;
265 u2* exception_table_length_addr() const;
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
275 // exception table
276 int exception_table_length() const;
277 ExceptionTableElement* exception_table_start() const;
278
279 // byte codes
280 void set_code(address code) {
281 if (code_size() > 0) {
282 memcpy(code_base(), code, code_size());
283 }
284 }
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()
291 { return in_ByteSize(sizeof(ConstMethod)); }
292
293 static ByteSize constants_offset()
294 { return byte_offset_of(ConstMethod, _constants); }
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
302 // Deallocation for RedefineClasses
303 void deallocate_contents(ClassLoaderData* loader_data);
304 bool is_klass() const { return false; }
305 DEBUG_ONLY(bool on_stack() { return false; })
306
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
310 // from the end of the ConstMethod*.
311
312 // First byte after ConstMethod*
313 address constMethod_end() const
314 { return (address)((oop*)this + _constMethod_size); }
315
316 // Last short in ConstMethod*
317 u2* last_u2_element() const
318 { return (u2*)constMethod_end() - 1; }
319
320 public:
321 // Printing
322 void print_on (outputStream* st) const;
323 void print_value_on(outputStream* st) const;
324
325 const char* internal_name() const { return "{constMethod}"; }
326
327 // Verify
328 void verify_on(outputStream* st);
329 };
330
331 #endif // SHARE_VM_OOPS_CONSTMETHODOOP_HPP