Wed, 02 Jan 2013 20:28:09 -0500
8005494: SIGSEGV in Rewriter::relocate_and_link() when testing Weblogic with CompressedOops and KlassPtrs
Summary: Relocate functions with jsr's when rewriting so not repeated after reading shared archive
Reviewed-by: twisti, jrose
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
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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.
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23 */
25 #ifndef SHARE_VM_OOPS_CONSTMETHODOOP_HPP
26 #define SHARE_VM_OOPS_CONSTMETHODOOP_HPP
28 #include "oops/oop.hpp"
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 | max_stack |
49 // | max_locals | size_of_parameters |
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 ConstMethod*) |
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) |
66 // | (indexed from end of ConstMethod*) |
67 // |------------------------------------------------------|
68 // | exception table + length (length last) |
69 // | (length is u2, elements are 4-tuples of u2) |
70 // | (see class ExceptionTableElement) |
71 // | (access flags bit tells whether table is present) |
72 // | (indexed from end of ConstMethod*) |
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 ConstMethod*) |
79 // |------------------------------------------------------|
80 // | generic signature index (u2) |
81 // | (indexed from start of constMethodOop) |
82 // |------------------------------------------------------|
85 // Utitily class decribing elements in checked exceptions table inlined in Method*.
86 class CheckedExceptionElement VALUE_OBJ_CLASS_SPEC {
87 public:
88 u2 class_cp_index;
89 };
92 // Utitily class decribing elements in local variable table inlined in Method*.
93 class LocalVariableTableElement VALUE_OBJ_CLASS_SPEC {
94 public:
95 u2 start_bci;
96 u2 length;
97 u2 name_cp_index;
98 u2 descriptor_cp_index;
99 u2 signature_cp_index;
100 u2 slot;
101 };
103 // Utitily class describing elements in exception table
104 class ExceptionTableElement VALUE_OBJ_CLASS_SPEC {
105 public:
106 u2 start_pc;
107 u2 end_pc;
108 u2 handler_pc;
109 u2 catch_type_index;
110 };
113 class ConstMethod : public MetaspaceObj {
114 friend class VMStructs;
116 public:
117 typedef enum { NORMAL, OVERPASS } MethodType;
119 private:
120 enum {
121 _has_linenumber_table = 1,
122 _has_checked_exceptions = 2,
123 _has_localvariable_table = 4,
124 _has_exception_table = 8,
125 _has_generic_signature = 16,
126 _is_overpass = 32
127 };
129 // Bit vector of signature
130 // Callers interpret 0=not initialized yet and
131 // -1=too many args to fix, must parse the slow way.
132 // The real initial value is special to account for nonatomicity of 64 bit
133 // loads and stores. This value may updated and read without a lock by
134 // multiple threads, so is volatile.
135 volatile uint64_t _fingerprint;
137 ConstantPool* _constants; // Constant pool
139 // Raw stackmap data for the method
140 Array<u1>* _stackmap_data;
142 int _constMethod_size;
143 jbyte _interpreter_kind;
144 jbyte _flags;
146 // Size of Java bytecodes allocated immediately after Method*.
147 u2 _code_size;
148 u2 _name_index; // Method name (index in constant pool)
149 u2 _signature_index; // Method signature (index in constant pool)
150 u2 _method_idnum; // unique identification number for the method within the class
151 // initially corresponds to the index into the methods array.
152 // but this may change with redefinition
153 u2 _max_stack; // Maximum number of entries on the expression stack
154 u2 _max_locals; // Number of local variables used by this method
155 u2 _size_of_parameters; // size of the parameter block (receiver + arguments) in words
157 // Constructor
158 ConstMethod(int byte_code_size,
159 int compressed_line_number_size,
160 int localvariable_table_length,
161 int exception_table_length,
162 int checked_exceptions_length,
163 u2 generic_signature_index,
164 MethodType is_overpass,
165 int size);
166 public:
168 static ConstMethod* allocate(ClassLoaderData* loader_data,
169 int byte_code_size,
170 int compressed_line_number_size,
171 int localvariable_table_length,
172 int exception_table_length,
173 int checked_exceptions_length,
174 u2 generic_signature_index,
175 MethodType mt,
176 TRAPS);
178 bool is_constMethod() const { return true; }
180 // Inlined tables
181 void set_inlined_tables_length(u2 generic_signature_index,
182 int checked_exceptions_len,
183 int compressed_line_number_size,
184 int localvariable_table_len,
185 int exception_table_len);
187 bool has_generic_signature() const
188 { return (_flags & _has_generic_signature) != 0; }
190 bool has_linenumber_table() const
191 { return (_flags & _has_linenumber_table) != 0; }
193 bool has_checked_exceptions() const
194 { return (_flags & _has_checked_exceptions) != 0; }
196 bool has_localvariable_table() const
197 { return (_flags & _has_localvariable_table) != 0; }
199 bool has_exception_handler() const
200 { return (_flags & _has_exception_table) != 0; }
202 MethodType method_type() const {
203 return ((_flags & _is_overpass) == 0) ? NORMAL : OVERPASS;
204 }
206 void set_method_type(MethodType mt) {
207 if (mt == NORMAL) {
208 _flags &= ~(_is_overpass);
209 } else {
210 _flags |= _is_overpass;
211 }
212 }
215 void set_interpreter_kind(int kind) { _interpreter_kind = kind; }
216 int interpreter_kind(void) const { return _interpreter_kind; }
218 // constant pool
219 ConstantPool* constants() const { return _constants; }
220 void set_constants(ConstantPool* c) { _constants = c; }
222 Method* method() const;
224 // stackmap table data
225 Array<u1>* stackmap_data() const { return _stackmap_data; }
226 void set_stackmap_data(Array<u1>* sd) { _stackmap_data = sd; }
227 bool has_stackmap_table() const { return _stackmap_data != NULL; }
229 void init_fingerprint() {
230 const uint64_t initval = CONST64(0x8000000000000000);
231 _fingerprint = initval;
232 }
234 uint64_t fingerprint() const {
235 // Since reads aren't atomic for 64 bits, if any of the high or low order
236 // word is the initial value, return 0. See init_fingerprint for initval.
237 uint high_fp = (uint)(_fingerprint >> 32);
238 if ((int) _fingerprint == 0 || high_fp == 0x80000000) {
239 return 0L;
240 } else {
241 return _fingerprint;
242 }
243 }
245 uint64_t set_fingerprint(uint64_t new_fingerprint) {
246 #ifdef ASSERT
247 // Assert only valid if complete/valid 64 bit _fingerprint value is read.
248 uint64_t oldfp = fingerprint();
249 #endif // ASSERT
250 _fingerprint = new_fingerprint;
251 assert(oldfp == 0L || new_fingerprint == oldfp,
252 "fingerprint cannot change");
253 assert(((new_fingerprint >> 32) != 0x80000000) && (int)new_fingerprint !=0,
254 "fingerprint should call init to set initial value");
255 return new_fingerprint;
256 }
258 // name
259 int name_index() const { return _name_index; }
260 void set_name_index(int index) { _name_index = index; }
262 // signature
263 int signature_index() const { return _signature_index; }
264 void set_signature_index(int index) { _signature_index = index; }
266 // generics support
267 int generic_signature_index() const {
268 if (has_generic_signature()) {
269 return *generic_signature_index_addr();
270 } else {
271 return 0;
272 }
273 }
274 void set_generic_signature_index(u2 index) {
275 assert(has_generic_signature(), "");
276 u2* addr = generic_signature_index_addr();
277 *addr = index;
278 }
280 // Sizing
281 static int header_size() {
282 return sizeof(ConstMethod)/HeapWordSize;
283 }
285 // Size needed
286 static int size(int code_size, int compressed_line_number_size,
287 int local_variable_table_length,
288 int exception_table_length,
289 int checked_exceptions_length,
290 u2 generic_signature_index);
292 int size() const { return _constMethod_size;}
293 void set_constMethod_size(int size) { _constMethod_size = size; }
295 // code size
296 int code_size() const { return _code_size; }
297 void set_code_size(int size) {
298 assert(max_method_code_size < (1 << 16),
299 "u2 is too small to hold method code size in general");
300 assert(0 <= size && size <= max_method_code_size, "invalid code size");
301 _code_size = size;
302 }
304 // linenumber table - note that length is unknown until decompression,
305 // see class CompressedLineNumberReadStream.
306 u_char* compressed_linenumber_table() const; // not preserved by gc
307 u2* generic_signature_index_addr() const;
308 u2* checked_exceptions_length_addr() const;
309 u2* localvariable_table_length_addr() const;
310 u2* exception_table_length_addr() const;
312 // checked exceptions
313 int checked_exceptions_length() const;
314 CheckedExceptionElement* checked_exceptions_start() const;
316 // localvariable table
317 int localvariable_table_length() const;
318 LocalVariableTableElement* localvariable_table_start() const;
320 // exception table
321 int exception_table_length() const;
322 ExceptionTableElement* exception_table_start() const;
324 // byte codes
325 void set_code(address code) {
326 if (code_size() > 0) {
327 memcpy(code_base(), code, code_size());
328 }
329 }
330 address code_base() const { return (address) (this+1); }
331 address code_end() const { return code_base() + code_size(); }
332 bool contains(address bcp) const { return code_base() <= bcp
333 && bcp < code_end(); }
334 // Offset to bytecodes
335 static ByteSize codes_offset()
336 { return in_ByteSize(sizeof(ConstMethod)); }
338 static ByteSize constants_offset()
339 { return byte_offset_of(ConstMethod, _constants); }
341 static ByteSize max_stack_offset()
342 { return byte_offset_of(ConstMethod, _max_stack); }
343 static ByteSize size_of_locals_offset()
344 { return byte_offset_of(ConstMethod, _max_locals); }
345 static ByteSize size_of_parameters_offset()
346 { return byte_offset_of(ConstMethod, _size_of_parameters); }
349 // Unique id for the method
350 static const u2 MAX_IDNUM;
351 static const u2 UNSET_IDNUM;
352 u2 method_idnum() const { return _method_idnum; }
353 void set_method_idnum(u2 idnum) { _method_idnum = idnum; }
355 // max stack
356 int max_stack() const { return _max_stack; }
357 void set_max_stack(int size) { _max_stack = size; }
359 // max locals
360 int max_locals() const { return _max_locals; }
361 void set_max_locals(int size) { _max_locals = size; }
363 // size of parameters
364 int size_of_parameters() const { return _size_of_parameters; }
365 void set_size_of_parameters(int size) { _size_of_parameters = size; }
367 // Deallocation for RedefineClasses
368 void deallocate_contents(ClassLoaderData* loader_data);
369 bool is_klass() const { return false; }
370 DEBUG_ONLY(bool on_stack() { return false; })
372 private:
373 // Since the size of the compressed line number table is unknown, the
374 // offsets of the other variable sized sections are computed backwards
375 // from the end of the ConstMethod*.
377 // First byte after ConstMethod*
378 address constMethod_end() const
379 { return (address)((oop*)this + _constMethod_size); }
381 // Last short in ConstMethod*
382 u2* last_u2_element() const
383 { return (u2*)constMethod_end() - 1; }
385 public:
386 // Printing
387 void print_on (outputStream* st) const;
388 void print_value_on(outputStream* st) const;
390 const char* internal_name() const { return "{constMethod}"; }
392 // Verify
393 void verify_on(outputStream* st);
394 };
396 #endif // SHARE_VM_OOPS_CONSTMETHODOOP_HPP