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comparison src/share/vm/oops/constMethod.cpp @ 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 18fb7da42534
children b2dbd323c668
comparison
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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 #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"
31
32 // Static initialization
33 const u2 ConstMethod::MAX_IDNUM = 0xFFFE;
34 const u2 ConstMethod::UNSET_IDNUM = 0xFFFF;
35
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 MethodType method_type,
43 TRAPS) {
44 int size = ConstMethod::size(byte_code_size,
45 compressed_line_number_size,
46 localvariable_table_length,
47 exception_table_length,
48 checked_exceptions_length);
49 return new (loader_data, size, true, THREAD) ConstMethod(
50 byte_code_size, compressed_line_number_size, localvariable_table_length,
51 exception_table_length, checked_exceptions_length, method_type, size);
52 }
53
54 ConstMethod::ConstMethod(int byte_code_size,
55 int compressed_line_number_size,
56 int localvariable_table_length,
57 int exception_table_length,
58 int checked_exceptions_length,
59 MethodType method_type,
60 int size) {
61
62 No_Safepoint_Verifier no_safepoint;
63 set_interpreter_kind(Interpreter::invalid);
64 init_fingerprint();
65 set_constants(NULL);
66 set_stackmap_data(NULL);
67 set_code_size(byte_code_size);
68 set_constMethod_size(size);
69 set_inlined_tables_length(checked_exceptions_length,
70 compressed_line_number_size,
71 localvariable_table_length,
72 exception_table_length);
73 set_method_type(method_type);
74 assert(this->size() == size, "wrong size for object");
75 }
76
77
78 // Deallocate metadata fields associated with ConstMethod*
79 void ConstMethod::deallocate_contents(ClassLoaderData* loader_data) {
80 set_interpreter_kind(Interpreter::invalid);
81 if (stackmap_data() != NULL) {
82 MetadataFactory::free_array<u1>(loader_data, stackmap_data());
83 }
84 set_stackmap_data(NULL);
85 }
86
87 // How big must this constMethodObject be?
88
89 int ConstMethod::size(int code_size,
90 int compressed_line_number_size,
91 int local_variable_table_length,
92 int exception_table_length,
93 int checked_exceptions_length) {
94 int extra_bytes = code_size;
95 if (compressed_line_number_size > 0) {
96 extra_bytes += compressed_line_number_size;
97 }
98 if (checked_exceptions_length > 0) {
99 extra_bytes += sizeof(u2);
100 extra_bytes += checked_exceptions_length * sizeof(CheckedExceptionElement);
101 }
102 if (local_variable_table_length > 0) {
103 extra_bytes += sizeof(u2);
104 extra_bytes +=
105 local_variable_table_length * sizeof(LocalVariableTableElement);
106 }
107 if (exception_table_length > 0) {
108 extra_bytes += sizeof(u2);
109 extra_bytes += exception_table_length * sizeof(ExceptionTableElement);
110 }
111 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
112 return align_object_size(header_size() + extra_words);
113 }
114
115 Method* ConstMethod::method() const {
116 return _constants->pool_holder()->method_with_idnum(_method_idnum);
117 }
118
119 // linenumber table - note that length is unknown until decompression,
120 // see class CompressedLineNumberReadStream.
121
122 u_char* ConstMethod::compressed_linenumber_table() const {
123 // Located immediately following the bytecodes.
124 assert(has_linenumber_table(), "called only if table is present");
125 return code_end();
126 }
127
128 u2* ConstMethod::checked_exceptions_length_addr() const {
129 // Located at the end of the constMethod.
130 assert(has_checked_exceptions(), "called only if table is present");
131 return last_u2_element();
132 }
133
134 u2* ConstMethod::exception_table_length_addr() const {
135 assert(has_exception_handler(), "called only if table is present");
136 if (has_checked_exceptions()) {
137 // If checked_exception present, locate immediately before them.
138 return (u2*) checked_exceptions_start() - 1;
139 } else {
140 // Else, the exception table is at the end of the constMethod.
141 return last_u2_element();
142 }
143 }
144
145 u2* ConstMethod::localvariable_table_length_addr() const {
146 assert(has_localvariable_table(), "called only if table is present");
147 if (has_exception_handler()) {
148 // If exception_table present, locate immediately before them.
149 return (u2*) exception_table_start() - 1;
150 } else {
151 if (has_checked_exceptions()) {
152 // If checked_exception present, locate immediately before them.
153 return (u2*) checked_exceptions_start() - 1;
154 } else {
155 // Else, the linenumber table is at the end of the constMethod.
156 return last_u2_element();
157 }
158 }
159 }
160
161
162 // Update the flags to indicate the presence of these optional fields.
163 void ConstMethod::set_inlined_tables_length(
164 int checked_exceptions_len,
165 int compressed_line_number_size,
166 int localvariable_table_len,
167 int exception_table_len) {
168 // Must be done in the order below, otherwise length_addr accessors
169 // will not work. Only set bit in header if length is positive.
170 assert(_flags == 0, "Error");
171 if (compressed_line_number_size > 0) {
172 _flags |= _has_linenumber_table;
173 }
174 if (checked_exceptions_len > 0) {
175 _flags |= _has_checked_exceptions;
176 *(checked_exceptions_length_addr()) = checked_exceptions_len;
177 }
178 if (exception_table_len > 0) {
179 _flags |= _has_exception_table;
180 *(exception_table_length_addr()) = exception_table_len;
181 }
182 if (localvariable_table_len > 0) {
183 _flags |= _has_localvariable_table;
184 *(localvariable_table_length_addr()) = localvariable_table_len;
185 }
186 }
187
188
189 int ConstMethod::checked_exceptions_length() const {
190 return has_checked_exceptions() ? *(checked_exceptions_length_addr()) : 0;
191 }
192
193
194 CheckedExceptionElement* ConstMethod::checked_exceptions_start() const {
195 u2* addr = checked_exceptions_length_addr();
196 u2 length = *addr;
197 assert(length > 0, "should only be called if table is present");
198 addr -= length * sizeof(CheckedExceptionElement) / sizeof(u2);
199 return (CheckedExceptionElement*) addr;
200 }
201
202
203 int ConstMethod::localvariable_table_length() const {
204 return has_localvariable_table() ? *(localvariable_table_length_addr()) : 0;
205 }
206
207
208 LocalVariableTableElement* ConstMethod::localvariable_table_start() const {
209 u2* addr = localvariable_table_length_addr();
210 u2 length = *addr;
211 assert(length > 0, "should only be called if table is present");
212 addr -= length * sizeof(LocalVariableTableElement) / sizeof(u2);
213 return (LocalVariableTableElement*) addr;
214 }
215
216 int ConstMethod::exception_table_length() const {
217 return has_exception_handler() ? *(exception_table_length_addr()) : 0;
218 }
219
220 ExceptionTableElement* ConstMethod::exception_table_start() const {
221 u2* addr = exception_table_length_addr();
222 u2 length = *addr;
223 assert(length > 0, "should only be called if table is present");
224 addr -= length * sizeof(ExceptionTableElement) / sizeof(u2);
225 return (ExceptionTableElement*)addr;
226 }
227
228
229 // Printing
230
231 void ConstMethod::print_on(outputStream* st) const {
232 ResourceMark rm;
233 assert(is_constMethod(), "must be constMethod");
234 st->print_cr(internal_name());
235 st->print(" - method: " INTPTR_FORMAT " ", (address)method());
236 method()->print_value_on(st); st->cr();
237 if (has_stackmap_table()) {
238 st->print(" - stackmap data: ");
239 stackmap_data()->print_value_on(st);
240 st->cr();
241 }
242 }
243
244 // Short version of printing ConstMethod* - just print the name of the
245 // method it belongs to.
246 void ConstMethod::print_value_on(outputStream* st) const {
247 assert(is_constMethod(), "must be constMethod");
248 st->print(" const part of method " );
249 method()->print_value_on(st);
250 }
251
252
253 // Verification
254
255 void ConstMethod::verify_on(outputStream* st) {
256 guarantee(is_constMethod(), "object must be constMethod");
257 guarantee(is_metadata(), err_msg("Should be metadata " PTR_FORMAT, this));
258
259 // Verification can occur during oop construction before the method or
260 // other fields have been initialized.
261 guarantee(is_metadata(), err_msg("Should be metadata " PTR_FORMAT, this));
262 guarantee(method()->is_method(), "should be method");
263
264 address m_end = (address)((oop*) this + size());
265 address compressed_table_start = code_end();
266 guarantee(compressed_table_start <= m_end, "invalid method layout");
267 address compressed_table_end = compressed_table_start;
268 // Verify line number table
269 if (has_linenumber_table()) {
270 CompressedLineNumberReadStream stream(compressed_linenumber_table());
271 while (stream.read_pair()) {
272 guarantee(stream.bci() >= 0 && stream.bci() <= code_size(), "invalid bci in line number table");
273 }
274 compressed_table_end += stream.position();
275 }
276 guarantee(compressed_table_end <= m_end, "invalid method layout");
277 // Verify checked exceptions, exception table and local variable tables
278 if (has_checked_exceptions()) {
279 u2* addr = checked_exceptions_length_addr();
280 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
281 }
282 if (has_exception_handler()) {
283 u2* addr = exception_table_length_addr();
284 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
285 }
286 if (has_localvariable_table()) {
287 u2* addr = localvariable_table_length_addr();
288 guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
289 }
290 // Check compressed_table_end relative to uncompressed_table_start
291 u2* uncompressed_table_start;
292 if (has_localvariable_table()) {
293 uncompressed_table_start = (u2*) localvariable_table_start();
294 } else if (has_exception_handler()) {
295 uncompressed_table_start = (u2*) exception_table_start();
296 } else if (has_checked_exceptions()) {
297 uncompressed_table_start = (u2*) checked_exceptions_start();
298 } else {
299 uncompressed_table_start = (u2*) m_end;
300 }
301 int gap = (intptr_t) uncompressed_table_start - (intptr_t) compressed_table_end;
302 int max_gap = align_object_size(1)*BytesPerWord;
303 guarantee(gap >= 0 && gap < max_gap, "invalid method layout");
304 }