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
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.
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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
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23 */
25 #include "precompiled.hpp"
26 #include "interpreter/interpreter.hpp"
27 #include "memory/gcLocker.hpp"
28 #include "memory/metadataFactory.hpp"
29 #include "oops/constMethod.hpp"
30 #include "oops/method.hpp"
32 // Static initialization
33 const u2 ConstMethod::MAX_IDNUM = 0xFFFE;
34 const u2 ConstMethod::UNSET_IDNUM = 0xFFFF;
36 ConstMethod* ConstMethod::allocate(ClassLoaderData* loader_data,
37 int byte_code_size,
38 int compressed_line_number_size,
39 int localvariable_table_length,
40 int exception_table_length,
41 int checked_exceptions_length,
42 u2 generic_signature_index,
43 MethodType method_type,
44 TRAPS) {
45 int size = ConstMethod::size(byte_code_size,
46 compressed_line_number_size,
47 localvariable_table_length,
48 exception_table_length,
49 checked_exceptions_length,
50 generic_signature_index);
51 return new (loader_data, size, true, THREAD) ConstMethod(
52 byte_code_size, compressed_line_number_size, localvariable_table_length,
53 exception_table_length, checked_exceptions_length, generic_signature_index,
54 method_type, size);
55 }
57 ConstMethod::ConstMethod(int byte_code_size,
58 int compressed_line_number_size,
59 int localvariable_table_length,
60 int exception_table_length,
61 int checked_exceptions_length,
62 u2 generic_signature_index,
63 MethodType method_type,
64 int size) {
66 No_Safepoint_Verifier no_safepoint;
67 set_interpreter_kind(Interpreter::invalid);
68 init_fingerprint();
69 set_constants(NULL);
70 set_stackmap_data(NULL);
71 set_code_size(byte_code_size);
72 set_constMethod_size(size);
73 set_inlined_tables_length(generic_signature_index,
74 checked_exceptions_length,
75 compressed_line_number_size,
76 localvariable_table_length,
77 exception_table_length);
78 set_method_type(method_type);
79 assert(this->size() == size, "wrong size for object");
80 }
83 // Deallocate metadata fields associated with ConstMethod*
84 void ConstMethod::deallocate_contents(ClassLoaderData* loader_data) {
85 set_interpreter_kind(Interpreter::invalid);
86 if (stackmap_data() != NULL) {
87 MetadataFactory::free_array<u1>(loader_data, stackmap_data());
88 }
89 set_stackmap_data(NULL);
90 }
92 // How big must this constMethodObject be?
94 int ConstMethod::size(int code_size,
95 int compressed_line_number_size,
96 int local_variable_table_length,
97 int exception_table_length,
98 int checked_exceptions_length,
99 u2 generic_signature_index) {
100 int extra_bytes = code_size;
101 if (compressed_line_number_size > 0) {
102 extra_bytes += compressed_line_number_size;
103 }
104 if (checked_exceptions_length > 0) {
105 extra_bytes += sizeof(u2);
106 extra_bytes += checked_exceptions_length * sizeof(CheckedExceptionElement);
107 }
108 if (local_variable_table_length > 0) {
109 extra_bytes += sizeof(u2);
110 extra_bytes +=
111 local_variable_table_length * sizeof(LocalVariableTableElement);
112 }
113 if (exception_table_length > 0) {
114 extra_bytes += sizeof(u2);
115 extra_bytes += exception_table_length * sizeof(ExceptionTableElement);
116 }
117 if (generic_signature_index != 0) {
118 extra_bytes += sizeof(u2);
119 }
120 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
121 return align_object_size(header_size() + extra_words);
122 }
124 Method* ConstMethod::method() const {
125 return _constants->pool_holder()->method_with_idnum(_method_idnum);
126 }
128 // linenumber table - note that length is unknown until decompression,
129 // see class CompressedLineNumberReadStream.
131 u_char* ConstMethod::compressed_linenumber_table() const {
132 // Located immediately following the bytecodes.
133 assert(has_linenumber_table(), "called only if table is present");
134 return code_end();
135 }
137 u2* ConstMethod::generic_signature_index_addr() const {
138 // Located at the end of the constMethod.
139 assert(has_generic_signature(), "called only if generic signature exists");
140 return last_u2_element();
141 }
143 u2* ConstMethod::checked_exceptions_length_addr() const {
144 // Located immediately before the generic signature index.
145 assert(has_checked_exceptions(), "called only if table is present");
146 return has_generic_signature() ? (last_u2_element() - 1) :
147 last_u2_element();
148 }
150 u2* ConstMethod::exception_table_length_addr() const {
151 assert(has_exception_handler(), "called only if table is present");
152 if (has_checked_exceptions()) {
153 // If checked_exception present, locate immediately before them.
154 return (u2*) checked_exceptions_start() - 1;
155 } else {
156 // Else, the exception table is at the end of the constMethod or
157 // immediately before the generic signature index.
158 return has_generic_signature() ? (last_u2_element() - 1) :
159 last_u2_element();
160 }
161 }
163 u2* ConstMethod::localvariable_table_length_addr() const {
164 assert(has_localvariable_table(), "called only if table is present");
165 if (has_exception_handler()) {
166 // If exception_table present, locate immediately before them.
167 return (u2*) exception_table_start() - 1;
168 } else {
169 if (has_checked_exceptions()) {
170 // If checked_exception present, locate immediately before them.
171 return (u2*) checked_exceptions_start() - 1;
172 } else {
173 // Else, the linenumber table is at the end of the constMethod or
174 // immediately before the generic signature index.
175 return has_generic_signature() ? (last_u2_element() - 1) :
176 last_u2_element();
177 }
178 }
179 }
181 // Update the flags to indicate the presence of these optional fields.
182 void ConstMethod::set_inlined_tables_length(u2 generic_signature_index,
183 int checked_exceptions_len,
184 int compressed_line_number_size,
185 int localvariable_table_len,
186 int exception_table_len) {
187 // Must be done in the order below, otherwise length_addr accessors
188 // will not work. Only set bit in header if length is positive.
189 assert(_flags == 0, "Error");
190 if (compressed_line_number_size > 0) {
191 _flags |= _has_linenumber_table;
192 }
193 if (generic_signature_index != 0) {
194 _flags |= _has_generic_signature;
195 *(generic_signature_index_addr()) = generic_signature_index;
196 }
197 if (checked_exceptions_len > 0) {
198 _flags |= _has_checked_exceptions;
199 *(checked_exceptions_length_addr()) = checked_exceptions_len;
200 }
201 if (exception_table_len > 0) {
202 _flags |= _has_exception_table;
203 *(exception_table_length_addr()) = exception_table_len;
204 }
205 if (localvariable_table_len > 0) {
206 _flags |= _has_localvariable_table;
207 *(localvariable_table_length_addr()) = localvariable_table_len;
208 }
209 }
212 int ConstMethod::checked_exceptions_length() const {
213 return has_checked_exceptions() ? *(checked_exceptions_length_addr()) : 0;
214 }
217 CheckedExceptionElement* ConstMethod::checked_exceptions_start() const {
218 u2* addr = checked_exceptions_length_addr();
219 u2 length = *addr;
220 assert(length > 0, "should only be called if table is present");
221 addr -= length * sizeof(CheckedExceptionElement) / sizeof(u2);
222 return (CheckedExceptionElement*) addr;
223 }
226 int ConstMethod::localvariable_table_length() const {
227 return has_localvariable_table() ? *(localvariable_table_length_addr()) : 0;
228 }
231 LocalVariableTableElement* ConstMethod::localvariable_table_start() const {
232 u2* addr = localvariable_table_length_addr();
233 u2 length = *addr;
234 assert(length > 0, "should only be called if table is present");
235 addr -= length * sizeof(LocalVariableTableElement) / sizeof(u2);
236 return (LocalVariableTableElement*) addr;
237 }
239 int ConstMethod::exception_table_length() const {
240 return has_exception_handler() ? *(exception_table_length_addr()) : 0;
241 }
243 ExceptionTableElement* ConstMethod::exception_table_start() const {
244 u2* addr = exception_table_length_addr();
245 u2 length = *addr;
246 assert(length > 0, "should only be called if table is present");
247 addr -= length * sizeof(ExceptionTableElement) / sizeof(u2);
248 return (ExceptionTableElement*)addr;
249 }
252 // Printing
254 void ConstMethod::print_on(outputStream* st) const {
255 ResourceMark rm;
256 assert(is_constMethod(), "must be constMethod");
257 st->print_cr(internal_name());
258 st->print(" - method: " INTPTR_FORMAT " ", (address)method());
259 method()->print_value_on(st); st->cr();
260 if (has_stackmap_table()) {
261 st->print(" - stackmap data: ");
262 stackmap_data()->print_value_on(st);
263 st->cr();
264 }
265 }
267 // Short version of printing ConstMethod* - just print the name of the
268 // method it belongs to.
269 void ConstMethod::print_value_on(outputStream* st) const {
270 assert(is_constMethod(), "must be constMethod");
271 st->print(" const part of method " );
272 method()->print_value_on(st);
273 }
276 // Verification
278 void ConstMethod::verify_on(outputStream* st) {
279 guarantee(is_constMethod(), "object must be constMethod");
280 guarantee(is_metadata(), err_msg("Should be metadata " PTR_FORMAT, this));
282 // Verification can occur during oop construction before the method or
283 // other fields have been initialized.
284 guarantee(is_metadata(), err_msg("Should be metadata " PTR_FORMAT, this));
285 guarantee(method()->is_method(), "should be method");
287 address m_end = (address)((oop*) this + size());
288 address compressed_table_start = code_end();
289 guarantee(compressed_table_start <= m_end, "invalid method layout");
290 address compressed_table_end = compressed_table_start;
291 // Verify line number table
292 if (has_linenumber_table()) {
293 CompressedLineNumberReadStream stream(compressed_linenumber_table());
294 while (stream.read_pair()) {
295 guarantee(stream.bci() >= 0 && stream.bci() <= code_size(), "invalid bci in line number table");
296 }
297 compressed_table_end += stream.position();
298 }
299 guarantee(compressed_table_end <= m_end, "invalid method layout");
300 // Verify checked exceptions, exception table and local variable tables
301 if (has_checked_exceptions()) {
302 u2* addr = checked_exceptions_length_addr();
303 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
304 }
305 if (has_exception_handler()) {
306 u2* addr = exception_table_length_addr();
307 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
308 }
309 if (has_localvariable_table()) {
310 u2* addr = localvariable_table_length_addr();
311 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
312 }
313 // Check compressed_table_end relative to uncompressed_table_start
314 u2* uncompressed_table_start;
315 if (has_localvariable_table()) {
316 uncompressed_table_start = (u2*) localvariable_table_start();
317 } else if (has_exception_handler()) {
318 uncompressed_table_start = (u2*) exception_table_start();
319 } else if (has_checked_exceptions()) {
320 uncompressed_table_start = (u2*) checked_exceptions_start();
321 } else {
322 uncompressed_table_start = (u2*) m_end;
323 }
324 int gap = (intptr_t) uncompressed_table_start - (intptr_t) compressed_table_end;
325 int max_gap = align_object_size(1)*BytesPerWord;
326 guarantee(gap >= 0 && gap < max_gap, "invalid method layout");
327 }