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comparison src/share/vm/oops/constMethod.hpp @ 6948:e522a00b91aa

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Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/ after NPG - C++ build works
author Doug Simon <doug.simon@oracle.com>
date Mon, 12 Nov 2012 23:14:12 +0100
parents 4735d2c84362
children b2dbd323c668
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6711:ae13cc658b80 6948:e522a00b91aa
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
112 public:
113 typedef enum { NORMAL, OVERPASS } MethodType;
114
115 private:
116 enum {
117 _has_linenumber_table = 1,
118 _has_checked_exceptions = 2,
119 _has_localvariable_table = 4,
120 _has_exception_table = 8,
121 _is_overpass = 16
122 };
123
124 // Bit vector of signature
125 // Callers interpret 0=not initialized yet and
126 // -1=too many args to fix, must parse the slow way.
127 // The real initial value is special to account for nonatomicity of 64 bit
128 // loads and stores. This value may updated and read without a lock by
129 // multiple threads, so is volatile.
130 volatile uint64_t _fingerprint;
131
132 ConstantPool* _constants; // Constant pool
133
134 // Raw stackmap data for the method
135 Array<u1>* _stackmap_data;
136
137 int _constMethod_size;
138 jbyte _interpreter_kind;
139 jbyte _flags;
140
141 // Size of Java bytecodes allocated immediately after Method*.
142 u2 _code_size;
143 u2 _name_index; // Method name (index in constant pool)
144 u2 _signature_index; // Method signature (index in constant pool)
145 u2 _method_idnum; // unique identification number for the method within the class
146 // initially corresponds to the index into the methods array.
147 // but this may change with redefinition
148 u2 _generic_signature_index; // Generic signature (index in constant pool, 0 if absent)
149
150
151 // Constructor
152 ConstMethod(int byte_code_size,
153 int compressed_line_number_size,
154 int localvariable_table_length,
155 int exception_table_length,
156 int checked_exceptions_length,
157 MethodType is_overpass,
158 int size);
159 public:
160
161 static ConstMethod* allocate(ClassLoaderData* loader_data,
162 int byte_code_size,
163 int compressed_line_number_size,
164 int localvariable_table_length,
165 int exception_table_length,
166 int checked_exceptions_length,
167 MethodType mt,
168 TRAPS);
169
170 bool is_constMethod() const { return true; }
171
172 // Inlined tables
173 void set_inlined_tables_length(int checked_exceptions_len,
174 int compressed_line_number_size,
175 int localvariable_table_len,
176 int exception_table_len);
177
178 bool has_linenumber_table() const
179 { return (_flags & _has_linenumber_table) != 0; }
180
181 bool has_checked_exceptions() const
182 { return (_flags & _has_checked_exceptions) != 0; }
183
184 bool has_localvariable_table() const
185 { return (_flags & _has_localvariable_table) != 0; }
186
187 bool has_exception_handler() const
188 { return (_flags & _has_exception_table) != 0; }
189
190 MethodType method_type() const {
191 return ((_flags & _is_overpass) == 0) ? NORMAL : OVERPASS;
192 }
193
194 void set_method_type(MethodType mt) {
195 if (mt == NORMAL) {
196 _flags &= ~(_is_overpass);
197 } else {
198 _flags |= _is_overpass;
199 }
200 }
201
202
203 void set_interpreter_kind(int kind) { _interpreter_kind = kind; }
204 int interpreter_kind(void) const { return _interpreter_kind; }
205
206 // constant pool
207 ConstantPool* constants() const { return _constants; }
208 void set_constants(ConstantPool* c) { _constants = c; }
209
210 Method* method() const;
211
212 // stackmap table data
213 Array<u1>* stackmap_data() const { return _stackmap_data; }
214 void set_stackmap_data(Array<u1>* sd) { _stackmap_data = sd; }
215 bool has_stackmap_table() const { return _stackmap_data != NULL; }
216
217 void init_fingerprint() {
218 const uint64_t initval = CONST64(0x8000000000000000);
219 _fingerprint = initval;
220 }
221
222 uint64_t fingerprint() const {
223 // Since reads aren't atomic for 64 bits, if any of the high or low order
224 // word is the initial value, return 0. See init_fingerprint for initval.
225 uint high_fp = (uint)(_fingerprint >> 32);
226 if ((int) _fingerprint == 0 || high_fp == 0x80000000) {
227 return 0L;
228 } else {
229 return _fingerprint;
230 }
231 }
232
233 uint64_t set_fingerprint(uint64_t new_fingerprint) {
234 #ifdef ASSERT
235 // Assert only valid if complete/valid 64 bit _fingerprint value is read.
236 uint64_t oldfp = fingerprint();
237 #endif // ASSERT
238 _fingerprint = new_fingerprint;
239 assert(oldfp == 0L || new_fingerprint == oldfp,
240 "fingerprint cannot change");
241 assert(((new_fingerprint >> 32) != 0x80000000) && (int)new_fingerprint !=0,
242 "fingerprint should call init to set initial value");
243 return new_fingerprint;
244 }
245
246 // name
247 int name_index() const { return _name_index; }
248 void set_name_index(int index) { _name_index = index; }
249
250 // signature
251 int signature_index() const { return _signature_index; }
252 void set_signature_index(int index) { _signature_index = index; }
253
254 // generics support
255 int generic_signature_index() const { return _generic_signature_index; }
256 void set_generic_signature_index(int index) { _generic_signature_index = index; }
257
258 // Sizing
259 static int header_size() {
260 return sizeof(ConstMethod)/HeapWordSize;
261 }
262
263 // Size needed
264 static int size(int code_size, int compressed_line_number_size,
265 int local_variable_table_length,
266 int exception_table_length,
267 int checked_exceptions_length);
268
269 int size() const { return _constMethod_size;}
270 void set_constMethod_size(int size) { _constMethod_size = size; }
271
272 // code size
273 int code_size() const { return _code_size; }
274 void set_code_size(int size) {
275 assert(max_method_code_size < (1 << 16),
276 "u2 is too small to hold method code size in general");
277 assert(0 <= size && size <= max_method_code_size, "invalid code size");
278 _code_size = size;
279 }
280
281 // linenumber table - note that length is unknown until decompression,
282 // see class CompressedLineNumberReadStream.
283 u_char* compressed_linenumber_table() const; // not preserved by gc
284 u2* checked_exceptions_length_addr() const;
285 u2* localvariable_table_length_addr() const;
286 u2* exception_table_length_addr() const;
287
288 // checked exceptions
289 int checked_exceptions_length() const;
290 CheckedExceptionElement* checked_exceptions_start() const;
291
292 // localvariable table
293 int localvariable_table_length() const;
294 LocalVariableTableElement* localvariable_table_start() const;
295
296 // exception table
297 int exception_table_length() const;
298 ExceptionTableElement* exception_table_start() const;
299
300 // byte codes
301 void set_code(address code) {
302 if (code_size() > 0) {
303 memcpy(code_base(), code, code_size());
304 }
305 }
306 address code_base() const { return (address) (this+1); }
307 address code_end() const { return code_base() + code_size(); }
308 bool contains(address bcp) const { return code_base() <= bcp
309 && bcp < code_end(); }
310 // Offset to bytecodes
311 static ByteSize codes_offset()
312 { return in_ByteSize(sizeof(ConstMethod)); }
313
314 static ByteSize constants_offset()
315 { return byte_offset_of(ConstMethod, _constants); }
316
317 // Unique id for the method
318 static const u2 MAX_IDNUM;
319 static const u2 UNSET_IDNUM;
320 u2 method_idnum() const { return _method_idnum; }
321 void set_method_idnum(u2 idnum) { _method_idnum = idnum; }
322
323 // Deallocation for RedefineClasses
324 void deallocate_contents(ClassLoaderData* loader_data);
325 bool is_klass() const { return false; }
326 DEBUG_ONLY(bool on_stack() { return false; })
327
328 private:
329 // Since the size of the compressed line number table is unknown, the
330 // offsets of the other variable sized sections are computed backwards
331 // from the end of the ConstMethod*.
332
333 // First byte after ConstMethod*
334 address constMethod_end() const
335 { return (address)((oop*)this + _constMethod_size); }
336
337 // Last short in ConstMethod*
338 u2* last_u2_element() const
339 { return (u2*)constMethod_end() - 1; }
340
341 public:
342 // Printing
343 void print_on (outputStream* st) const;
344 void print_value_on(outputStream* st) const;
345
346 const char* internal_name() const { return "{constMethod}"; }
347
348 // Verify
349 void verify_on(outputStream* st);
350 };
351
352 #endif // SHARE_VM_OOPS_CONSTMETHODOOP_HPP