1 /*
2 * Copyright (c) 2003, 2010, 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 *
24
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
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 |
44 // | method (oop) |
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) |
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;
113 volatile bool _is_conc_safe; // if true, safe for concurrent GC processing
114
115 public:
116 oop* oop_block_beg() const { return adr_method(); }
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
124 // Backpointer to non-const methodOop (needed for some JVMTI operations)
125 methodOop _method;
126
127 // Raw stackmap data for the method
128 typeArrayOop _stackmap_data;
129
130 // The exception handler table. 4-tuples of ints [start_pc, end_pc,
131 // handler_pc, catch_type index] For methods with no exceptions the
132 // table is pointing to Universe::the_empty_int_array
133 typeArrayOop _exception_table;
134
135 //
136 // End of the oop block.
137 //
138
139 int _constMethod_size;
140 jbyte _interpreter_kind;
141 jbyte _flags;
142
143 // Size of Java bytecodes allocated immediately after methodOop.
144 u2 _code_size;
145 u2 _name_index; // Method name (index in constant pool)
150 u2 _generic_signature_index; // Generic signature (index in constant pool, 0 if absent)
151
152 public:
153 // Inlined tables
154 void set_inlined_tables_length(int checked_exceptions_len,
155 int compressed_line_number_size,
156 int localvariable_table_len);
157
158 bool has_linenumber_table() const
159 { return (_flags & _has_linenumber_table) != 0; }
160
161 bool has_checked_exceptions() const
162 { return (_flags & _has_checked_exceptions) != 0; }
163
164 bool has_localvariable_table() const
165 { return (_flags & _has_localvariable_table) != 0; }
166
167 void set_interpreter_kind(int kind) { _interpreter_kind = kind; }
168 int interpreter_kind(void) const { return _interpreter_kind; }
169
170 // backpointer to non-const methodOop
171 methodOop method() const { return _method; }
172 void set_method(methodOop m) { oop_store_without_check((oop*)&_method, (oop) m); }
173
174
175 // stackmap table data
176 typeArrayOop stackmap_data() const { return _stackmap_data; }
177 void set_stackmap_data(typeArrayOop sd) {
178 oop_store_without_check((oop*)&_stackmap_data, (oop)sd);
179 }
180 bool has_stackmap_table() const { return _stackmap_data != NULL; }
181
182 // exception handler table
183 typeArrayOop exception_table() const { return _exception_table; }
184 void set_exception_table(typeArrayOop e) { oop_store_without_check((oop*) &_exception_table, (oop) e); }
185 bool has_exception_handler() const { return exception_table() != NULL && exception_table()->length() > 0; }
186
187 void init_fingerprint() {
188 const uint64_t initval = CONST64(0x8000000000000000);
189 _fingerprint = initval;
190 }
191
192 uint64_t fingerprint() const {
193 // Since reads aren't atomic for 64 bits, if any of the high or low order
261
262 // localvariable table
263 int localvariable_table_length() const;
264 LocalVariableTableElement* localvariable_table_start() const;
265
266 // byte codes
267 void set_code(address code) {
268 if (code_size() > 0) {
269 memcpy(code_base(), code, code_size());
270 }
271 }
272 address code_base() const { return (address) (this+1); }
273 address code_end() const { return code_base() + code_size(); }
274 bool contains(address bcp) const { return code_base() <= bcp
275 && bcp < code_end(); }
276 // Offset to bytecodes
277 static ByteSize codes_offset()
278 { return in_ByteSize(sizeof(constMethodOopDesc)); }
279
280 // interpreter support
281 static ByteSize exception_table_offset()
282 { return byte_offset_of(constMethodOopDesc, _exception_table); }
283
284 // Garbage collection support
285 oop* adr_method() const { return (oop*)&_method; }
286 oop* adr_stackmap_data() const { return (oop*)&_stackmap_data; }
287 oop* adr_exception_table() const { return (oop*)&_exception_table; }
288 bool is_conc_safe() { return _is_conc_safe; }
289 void set_is_conc_safe(bool v) { _is_conc_safe = v; }
290
291 // Unique id for the method
292 static const u2 MAX_IDNUM;
293 static const u2 UNSET_IDNUM;
294 u2 method_idnum() const { return _method_idnum; }
295 void set_method_idnum(u2 idnum) { _method_idnum = idnum; }
296
297 private:
298 // Since the size of the compressed line number table is unknown, the
299 // offsets of the other variable sized sections are computed backwards
300 // from the end of the constMethodOop.
301
302 // First byte after constMethodOop
303 address constMethod_end() const
304 { return (address)((oop*)this + _constMethod_size); }
305
|
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 *
24
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
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 |
44 // | constants (oop) |
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) |
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;
113 volatile bool _is_conc_safe; // if true, safe for concurrent GC processing
114
115 public:
116 oop* oop_block_beg() const { return adr_constants(); }
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
124 constantPoolOop _constants; // Constant pool
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)
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
169 // constant pool
170 constantPoolOop constants() const { return _constants; }
171 void set_constants(constantPoolOop c) {
172 oop_store_without_check((oop*)&_constants, (oop)c);
173 }
174
175 methodOop method() const;
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
263
264 // localvariable table
265 int localvariable_table_length() const;
266 LocalVariableTableElement* localvariable_table_start() const;
267
268 // byte codes
269 void set_code(address code) {
270 if (code_size() > 0) {
271 memcpy(code_base(), code, code_size());
272 }
273 }
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
283 static ByteSize constants_offset()
284 { return byte_offset_of(constMethodOopDesc, _constants); }
285 static ByteSize exception_table_offset()
286 { return byte_offset_of(constMethodOopDesc, _exception_table); }
287
288 // Garbage collection support
289 oop* adr_constants() const { return (oop*)&_constants; }
290 oop* adr_stackmap_data() const { return (oop*)&_stackmap_data; }
291 oop* adr_exception_table() const { return (oop*)&_exception_table; }
292 bool is_conc_safe() { return _is_conc_safe; }
293 void set_is_conc_safe(bool v) { _is_conc_safe = v; }
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
|